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);
1284 static declaration_t *append_declaration(declaration_t *declaration);
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 declaration->parent_context = context;
1334 if (symbol != NULL) {
1335 environment_push(declaration);
1337 append_declaration(declaration);
1340 if(token.type == '{') {
1341 if(declaration->init.is_defined) {
1342 assert(symbol != NULL);
1343 errorf(HERE, "multiple definition of '%s %Y'",
1344 is_struct ? "struct" : "union", symbol);
1345 declaration->context.declarations = NULL;
1347 declaration->init.is_defined = true;
1349 int top = environment_top();
1350 context_t *last_context = context;
1351 set_context(&declaration->context);
1353 parse_compound_type_entries();
1356 assert(context == &declaration->context);
1357 set_context(last_context);
1358 environment_pop_to(top);
1364 static void parse_enum_entries(enum_type_t *const enum_type)
1368 if(token.type == '}') {
1370 errorf(HERE, "empty enum not allowed");
1375 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
1377 if(token.type != T_IDENTIFIER) {
1378 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1382 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1383 entry->type = (type_t*) enum_type;
1384 entry->symbol = token.v.symbol;
1385 entry->source_position = token.source_position;
1388 if(token.type == '=') {
1390 entry->init.enum_value = parse_constant_expression();
1395 record_declaration(entry);
1397 if(token.type != ',')
1400 } while(token.type != '}');
1405 static type_t *parse_enum_specifier(void)
1409 declaration_t *declaration;
1412 if(token.type == T_IDENTIFIER) {
1413 symbol = token.v.symbol;
1416 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1417 } else if(token.type != '{') {
1418 parse_error_expected("while parsing enum type specifier",
1419 T_IDENTIFIER, '{', 0);
1426 if(declaration == NULL) {
1427 declaration = allocate_ast_zero(sizeof(declaration[0]));
1429 declaration->namespc = NAMESPACE_ENUM;
1430 declaration->source_position = token.source_position;
1431 declaration->symbol = symbol;
1432 declaration->parent_context = context;
1435 type_t *const type = allocate_type_zero(TYPE_ENUM);
1436 type->enumt.declaration = declaration;
1438 if(token.type == '{') {
1439 if(declaration->init.is_defined) {
1440 errorf(HERE, "multiple definitions of enum %Y", symbol);
1442 environment_push(declaration);
1443 append_declaration(declaration);
1444 declaration->init.is_defined = 1;
1446 parse_enum_entries(&type->enumt);
1454 * if a symbol is a typedef to another type, return true
1456 static bool is_typedef_symbol(symbol_t *symbol)
1458 const declaration_t *const declaration =
1459 get_declaration(symbol, NAMESPACE_NORMAL);
1461 declaration != NULL &&
1462 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1465 static type_t *parse_typeof(void)
1473 expression_t *expression = NULL;
1476 switch(token.type) {
1477 case T___extension__:
1478 /* this can be a prefix to a typename or an expression */
1479 /* we simply eat it now. */
1482 } while(token.type == T___extension__);
1486 if(is_typedef_symbol(token.v.symbol)) {
1487 type = parse_typename();
1489 expression = parse_expression();
1490 type = expression->base.datatype;
1495 type = parse_typename();
1499 expression = parse_expression();
1500 type = expression->base.datatype;
1506 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1507 typeof_type->typeoft.expression = expression;
1508 typeof_type->typeoft.typeof_type = type;
1514 SPECIFIER_SIGNED = 1 << 0,
1515 SPECIFIER_UNSIGNED = 1 << 1,
1516 SPECIFIER_LONG = 1 << 2,
1517 SPECIFIER_INT = 1 << 3,
1518 SPECIFIER_DOUBLE = 1 << 4,
1519 SPECIFIER_CHAR = 1 << 5,
1520 SPECIFIER_SHORT = 1 << 6,
1521 SPECIFIER_LONG_LONG = 1 << 7,
1522 SPECIFIER_FLOAT = 1 << 8,
1523 SPECIFIER_BOOL = 1 << 9,
1524 SPECIFIER_VOID = 1 << 10,
1525 #ifdef PROVIDE_COMPLEX
1526 SPECIFIER_COMPLEX = 1 << 11,
1527 SPECIFIER_IMAGINARY = 1 << 12,
1531 static type_t *create_builtin_type(symbol_t *const symbol,
1532 type_t *const real_type)
1534 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1535 type->builtin.symbol = symbol;
1536 type->builtin.real_type = real_type;
1538 type_t *result = typehash_insert(type);
1539 if (type != result) {
1546 static type_t *get_typedef_type(symbol_t *symbol)
1548 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1549 if(declaration == NULL
1550 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1553 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1554 type->typedeft.declaration = declaration;
1559 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1561 type_t *type = NULL;
1562 unsigned type_qualifiers = 0;
1563 unsigned type_specifiers = 0;
1566 specifiers->source_position = token.source_position;
1569 switch(token.type) {
1572 #define MATCH_STORAGE_CLASS(token, class) \
1574 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1575 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1577 specifiers->storage_class = class; \
1581 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1582 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1583 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1584 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1585 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1588 switch (specifiers->storage_class) {
1589 case STORAGE_CLASS_NONE:
1590 specifiers->storage_class = STORAGE_CLASS_THREAD;
1593 case STORAGE_CLASS_EXTERN:
1594 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1597 case STORAGE_CLASS_STATIC:
1598 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1602 errorf(HERE, "multiple storage classes in declaration specifiers");
1608 /* type qualifiers */
1609 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1611 type_qualifiers |= qualifier; \
1615 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1616 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1617 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1619 case T___extension__:
1624 /* type specifiers */
1625 #define MATCH_SPECIFIER(token, specifier, name) \
1628 if(type_specifiers & specifier) { \
1629 errorf(HERE, "multiple " name " type specifiers given"); \
1631 type_specifiers |= specifier; \
1635 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1636 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1637 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1638 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1639 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1640 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1641 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1642 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1643 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1644 #ifdef PROVIDE_COMPLEX
1645 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1646 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1649 /* only in microsoft mode */
1650 specifiers->decl_modifiers |= DM_FORCEINLINE;
1654 specifiers->is_inline = true;
1659 if(type_specifiers & SPECIFIER_LONG_LONG) {
1660 errorf(HERE, "multiple type specifiers given");
1661 } else if(type_specifiers & SPECIFIER_LONG) {
1662 type_specifiers |= SPECIFIER_LONG_LONG;
1664 type_specifiers |= SPECIFIER_LONG;
1668 /* TODO: if type != NULL for the following rules should issue
1671 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1673 type->compound.declaration = parse_compound_type_specifier(true);
1677 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1679 type->compound.declaration = parse_compound_type_specifier(false);
1683 type = parse_enum_specifier();
1686 type = parse_typeof();
1688 case T___builtin_va_list:
1689 type = duplicate_type(type_valist);
1693 case T___attribute__:
1698 case T_IDENTIFIER: {
1699 type_t *typedef_type = get_typedef_type(token.v.symbol);
1701 if(typedef_type == NULL)
1702 goto finish_specifiers;
1705 type = typedef_type;
1709 /* function specifier */
1711 goto finish_specifiers;
1718 atomic_type_type_t atomic_type;
1720 /* match valid basic types */
1721 switch(type_specifiers) {
1722 case SPECIFIER_VOID:
1723 atomic_type = ATOMIC_TYPE_VOID;
1725 case SPECIFIER_CHAR:
1726 atomic_type = ATOMIC_TYPE_CHAR;
1728 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1729 atomic_type = ATOMIC_TYPE_SCHAR;
1731 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1732 atomic_type = ATOMIC_TYPE_UCHAR;
1734 case SPECIFIER_SHORT:
1735 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1736 case SPECIFIER_SHORT | SPECIFIER_INT:
1737 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1738 atomic_type = ATOMIC_TYPE_SHORT;
1740 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1741 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1742 atomic_type = ATOMIC_TYPE_USHORT;
1745 case SPECIFIER_SIGNED:
1746 case SPECIFIER_SIGNED | SPECIFIER_INT:
1747 atomic_type = ATOMIC_TYPE_INT;
1749 case SPECIFIER_UNSIGNED:
1750 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1751 atomic_type = ATOMIC_TYPE_UINT;
1753 case SPECIFIER_LONG:
1754 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1755 case SPECIFIER_LONG | SPECIFIER_INT:
1756 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1757 atomic_type = ATOMIC_TYPE_LONG;
1759 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1760 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1761 atomic_type = ATOMIC_TYPE_ULONG;
1763 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1764 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1765 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1766 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1768 atomic_type = ATOMIC_TYPE_LONGLONG;
1770 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1771 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1773 atomic_type = ATOMIC_TYPE_ULONGLONG;
1775 case SPECIFIER_FLOAT:
1776 atomic_type = ATOMIC_TYPE_FLOAT;
1778 case SPECIFIER_DOUBLE:
1779 atomic_type = ATOMIC_TYPE_DOUBLE;
1781 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1782 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1784 case SPECIFIER_BOOL:
1785 atomic_type = ATOMIC_TYPE_BOOL;
1787 #ifdef PROVIDE_COMPLEX
1788 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1789 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1791 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1792 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1794 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1795 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1797 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1798 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1800 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1801 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1803 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1804 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1808 /* invalid specifier combination, give an error message */
1809 if(type_specifiers == 0) {
1810 if (! strict_mode) {
1811 warningf(HERE, "no type specifiers in declaration, using int");
1812 atomic_type = ATOMIC_TYPE_INT;
1815 errorf(HERE, "no type specifiers given in declaration");
1817 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1818 (type_specifiers & SPECIFIER_UNSIGNED)) {
1819 errorf(HERE, "signed and unsigned specifiers gives");
1820 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1821 errorf(HERE, "only integer types can be signed or unsigned");
1823 errorf(HERE, "multiple datatypes in declaration");
1825 atomic_type = ATOMIC_TYPE_INVALID;
1828 type = allocate_type_zero(TYPE_ATOMIC);
1829 type->atomic.atype = atomic_type;
1832 if(type_specifiers != 0) {
1833 errorf(HERE, "multiple datatypes in declaration");
1837 type->base.qualifiers = type_qualifiers;
1839 type_t *result = typehash_insert(type);
1840 if(newtype && result != type) {
1844 specifiers->type = result;
1847 static type_qualifiers_t parse_type_qualifiers(void)
1849 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1852 switch(token.type) {
1853 /* type qualifiers */
1854 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1855 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1856 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1859 return type_qualifiers;
1864 static declaration_t *parse_identifier_list(void)
1866 declaration_t *declarations = NULL;
1867 declaration_t *last_declaration = NULL;
1869 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1871 declaration->source_position = token.source_position;
1872 declaration->symbol = token.v.symbol;
1875 if(last_declaration != NULL) {
1876 last_declaration->next = declaration;
1878 declarations = declaration;
1880 last_declaration = declaration;
1882 if(token.type != ',')
1885 } while(token.type == T_IDENTIFIER);
1887 return declarations;
1890 static void semantic_parameter(declaration_t *declaration)
1892 /* TODO: improve error messages */
1894 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1895 errorf(HERE, "typedef not allowed in parameter list");
1896 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1897 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1898 errorf(HERE, "parameter may only have none or register storage class");
1901 type_t *orig_type = declaration->type;
1902 if(orig_type == NULL)
1904 type_t *type = skip_typeref(orig_type);
1906 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1907 * into a pointer. § 6.7.5.3 (7) */
1908 if (is_type_array(type)) {
1909 const array_type_t *arr_type = &type->array;
1910 type_t *element_type = arr_type->element_type;
1912 type = make_pointer_type(element_type, type->base.qualifiers);
1914 declaration->type = type;
1917 if(is_type_incomplete(type)) {
1918 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1919 orig_type, declaration->symbol);
1923 static declaration_t *parse_parameter(void)
1925 declaration_specifiers_t specifiers;
1926 memset(&specifiers, 0, sizeof(specifiers));
1928 parse_declaration_specifiers(&specifiers);
1930 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1932 semantic_parameter(declaration);
1937 static declaration_t *parse_parameters(function_type_t *type)
1939 if(token.type == T_IDENTIFIER) {
1940 symbol_t *symbol = token.v.symbol;
1941 if(!is_typedef_symbol(symbol)) {
1942 type->kr_style_parameters = true;
1943 return parse_identifier_list();
1947 if(token.type == ')') {
1948 type->unspecified_parameters = 1;
1951 if(token.type == T_void && look_ahead(1)->type == ')') {
1956 declaration_t *declarations = NULL;
1957 declaration_t *declaration;
1958 declaration_t *last_declaration = NULL;
1959 function_parameter_t *parameter;
1960 function_parameter_t *last_parameter = NULL;
1963 switch(token.type) {
1967 return declarations;
1970 case T___extension__:
1972 declaration = parse_parameter();
1974 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1975 memset(parameter, 0, sizeof(parameter[0]));
1976 parameter->type = declaration->type;
1978 if(last_parameter != NULL) {
1979 last_declaration->next = declaration;
1980 last_parameter->next = parameter;
1982 type->parameters = parameter;
1983 declarations = declaration;
1985 last_parameter = parameter;
1986 last_declaration = declaration;
1990 return declarations;
1992 if(token.type != ',')
1993 return declarations;
2003 } construct_type_type_t;
2005 typedef struct construct_type_t construct_type_t;
2006 struct construct_type_t {
2007 construct_type_type_t type;
2008 construct_type_t *next;
2011 typedef struct parsed_pointer_t parsed_pointer_t;
2012 struct parsed_pointer_t {
2013 construct_type_t construct_type;
2014 type_qualifiers_t type_qualifiers;
2017 typedef struct construct_function_type_t construct_function_type_t;
2018 struct construct_function_type_t {
2019 construct_type_t construct_type;
2020 type_t *function_type;
2023 typedef struct parsed_array_t parsed_array_t;
2024 struct parsed_array_t {
2025 construct_type_t construct_type;
2026 type_qualifiers_t type_qualifiers;
2032 typedef struct construct_base_type_t construct_base_type_t;
2033 struct construct_base_type_t {
2034 construct_type_t construct_type;
2038 static construct_type_t *parse_pointer_declarator(void)
2042 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
2043 memset(pointer, 0, sizeof(pointer[0]));
2044 pointer->construct_type.type = CONSTRUCT_POINTER;
2045 pointer->type_qualifiers = parse_type_qualifiers();
2047 return (construct_type_t*) pointer;
2050 static construct_type_t *parse_array_declarator(void)
2054 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
2055 memset(array, 0, sizeof(array[0]));
2056 array->construct_type.type = CONSTRUCT_ARRAY;
2058 if(token.type == T_static) {
2059 array->is_static = true;
2063 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
2064 if(type_qualifiers != 0) {
2065 if(token.type == T_static) {
2066 array->is_static = true;
2070 array->type_qualifiers = type_qualifiers;
2072 if(token.type == '*' && look_ahead(1)->type == ']') {
2073 array->is_variable = true;
2075 } else if(token.type != ']') {
2076 array->size = parse_assignment_expression();
2081 return (construct_type_t*) array;
2084 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2088 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2090 declaration_t *parameters = parse_parameters(&type->function);
2091 if(declaration != NULL) {
2092 declaration->context.declarations = parameters;
2095 construct_function_type_t *construct_function_type =
2096 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2097 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2098 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2099 construct_function_type->function_type = type;
2103 return (construct_type_t*) construct_function_type;
2106 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2107 bool may_be_abstract)
2109 /* construct a single linked list of construct_type_t's which describe
2110 * how to construct the final declarator type */
2111 construct_type_t *first = NULL;
2112 construct_type_t *last = NULL;
2115 while(token.type == '*') {
2116 construct_type_t *type = parse_pointer_declarator();
2127 /* TODO: find out if this is correct */
2130 construct_type_t *inner_types = NULL;
2132 switch(token.type) {
2134 if(declaration == NULL) {
2135 errorf(HERE, "no identifier expected in typename");
2137 declaration->symbol = token.v.symbol;
2138 declaration->source_position = token.source_position;
2144 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2150 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2151 /* avoid a loop in the outermost scope, because eat_statement doesn't
2153 if(token.type == '}' && current_function == NULL) {
2161 construct_type_t *p = last;
2164 construct_type_t *type;
2165 switch(token.type) {
2167 type = parse_function_declarator(declaration);
2170 type = parse_array_declarator();
2173 goto declarator_finished;
2176 /* insert in the middle of the list (behind p) */
2178 type->next = p->next;
2189 declarator_finished:
2192 /* append inner_types at the end of the list, we don't to set last anymore
2193 * as it's not needed anymore */
2195 assert(first == NULL);
2196 first = inner_types;
2198 last->next = inner_types;
2204 static type_t *construct_declarator_type(construct_type_t *construct_list,
2207 construct_type_t *iter = construct_list;
2208 for( ; iter != NULL; iter = iter->next) {
2209 switch(iter->type) {
2210 case CONSTRUCT_INVALID:
2211 panic("invalid type construction found");
2212 case CONSTRUCT_FUNCTION: {
2213 construct_function_type_t *construct_function_type
2214 = (construct_function_type_t*) iter;
2216 type_t *function_type = construct_function_type->function_type;
2218 function_type->function.return_type = type;
2220 type = function_type;
2224 case CONSTRUCT_POINTER: {
2225 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2226 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2227 pointer_type->pointer.points_to = type;
2228 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2230 type = pointer_type;
2234 case CONSTRUCT_ARRAY: {
2235 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2236 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2238 array_type->base.qualifiers = parsed_array->type_qualifiers;
2239 array_type->array.element_type = type;
2240 array_type->array.is_static = parsed_array->is_static;
2241 array_type->array.is_variable = parsed_array->is_variable;
2242 array_type->array.size = parsed_array->size;
2249 type_t *hashed_type = typehash_insert(type);
2250 if(hashed_type != type) {
2251 /* the function type was constructed earlier freeing it here will
2252 * destroy other types... */
2253 if(iter->type != CONSTRUCT_FUNCTION) {
2263 static declaration_t *parse_declarator(
2264 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2266 type_t *type = specifiers->type;
2267 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2268 declaration->storage_class = specifiers->storage_class;
2269 declaration->modifiers = specifiers->decl_modifiers;
2270 declaration->is_inline = specifiers->is_inline;
2272 construct_type_t *construct_type
2273 = parse_inner_declarator(declaration, may_be_abstract);
2274 declaration->type = construct_declarator_type(construct_type, type);
2276 if(construct_type != NULL) {
2277 obstack_free(&temp_obst, construct_type);
2283 static type_t *parse_abstract_declarator(type_t *base_type)
2285 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2287 type_t *result = construct_declarator_type(construct_type, base_type);
2288 if(construct_type != NULL) {
2289 obstack_free(&temp_obst, construct_type);
2295 static declaration_t *append_declaration(declaration_t* const declaration)
2297 if (last_declaration != NULL) {
2298 last_declaration->next = declaration;
2300 context->declarations = declaration;
2302 last_declaration = declaration;
2306 static declaration_t *internal_record_declaration(
2307 declaration_t *const declaration,
2308 const bool is_function_definition)
2310 const symbol_t *const symbol = declaration->symbol;
2311 const namespace_t namespc = (namespace_t)declaration->namespc;
2313 const type_t *const type = skip_typeref(declaration->type);
2314 if (is_type_function(type) && type->function.unspecified_parameters) {
2315 warningf(declaration->source_position,
2316 "function declaration '%#T' is not a prototype",
2317 type, declaration->symbol);
2320 declaration_t *const previous_declaration = get_declaration(symbol, namespc);
2321 assert(declaration != previous_declaration);
2322 if (previous_declaration != NULL
2323 && previous_declaration->parent_context == context) {
2324 const type_t *const prev_type = skip_typeref(previous_declaration->type);
2325 if (!types_compatible(type, prev_type)) {
2326 errorf(declaration->source_position,
2327 "declaration '%#T' is incompatible with previous declaration '%#T'",
2328 type, symbol, previous_declaration->type, symbol);
2329 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2331 unsigned old_storage_class = previous_declaration->storage_class;
2332 unsigned new_storage_class = declaration->storage_class;
2334 /* pretend no storage class means extern for function declarations
2335 * (except if the previous declaration is neither none nor extern) */
2336 if (is_type_function(type)) {
2337 switch (old_storage_class) {
2338 case STORAGE_CLASS_NONE:
2339 old_storage_class = STORAGE_CLASS_EXTERN;
2341 case STORAGE_CLASS_EXTERN:
2342 if (new_storage_class == STORAGE_CLASS_NONE && !is_function_definition) {
2343 new_storage_class = STORAGE_CLASS_EXTERN;
2351 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2352 new_storage_class == STORAGE_CLASS_EXTERN) {
2353 warn_redundant_declaration:
2354 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2355 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2356 } else if (current_function == NULL) {
2357 if (old_storage_class != STORAGE_CLASS_STATIC &&
2358 new_storage_class == STORAGE_CLASS_STATIC) {
2359 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2360 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2362 if (old_storage_class != STORAGE_CLASS_EXTERN) {
2363 goto warn_redundant_declaration;
2365 if (new_storage_class == STORAGE_CLASS_NONE) {
2366 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2370 if (old_storage_class == new_storage_class) {
2371 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2373 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2375 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2378 return previous_declaration;
2381 assert(declaration->parent_context == NULL);
2382 assert(declaration->symbol != NULL);
2383 assert(context != NULL);
2385 declaration->parent_context = context;
2387 environment_push(declaration);
2388 return append_declaration(declaration);
2391 static declaration_t *record_declaration(declaration_t *declaration)
2393 return internal_record_declaration(declaration, false);
2396 static declaration_t *record_function_definition(declaration_t *const declaration)
2398 return internal_record_declaration(declaration, true);
2401 static void parser_error_multiple_definition(declaration_t *declaration,
2402 const source_position_t source_position)
2404 errorf(source_position, "multiple definition of symbol '%Y'",
2405 declaration->symbol);
2406 errorf(declaration->source_position,
2407 "this is the location of the previous definition.");
2410 static bool is_declaration_specifier(const token_t *token,
2411 bool only_type_specifiers)
2413 switch(token->type) {
2417 return is_typedef_symbol(token->v.symbol);
2419 case T___extension__:
2422 return !only_type_specifiers;
2429 static void parse_init_declarator_rest(declaration_t *declaration)
2433 type_t *orig_type = declaration->type;
2434 type_t *type = NULL;
2435 if(orig_type != NULL)
2436 type = skip_typeref(orig_type);
2438 if(declaration->init.initializer != NULL) {
2439 parser_error_multiple_definition(declaration, token.source_position);
2442 initializer_t *initializer = parse_initializer(type);
2444 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2445 * the array type size */
2446 if(type != NULL && is_type_array(type) && initializer != NULL) {
2447 array_type_t *array_type = &type->array;
2449 if(array_type->size == NULL) {
2450 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2452 cnst->base.datatype = type_size_t;
2454 switch (initializer->kind) {
2455 case INITIALIZER_LIST: {
2456 initializer_list_t *const list = &initializer->list;
2457 cnst->conste.v.int_value = list->len;
2461 case INITIALIZER_STRING: {
2462 initializer_string_t *const string = &initializer->string;
2463 cnst->conste.v.int_value = strlen(string->string) + 1;
2467 case INITIALIZER_WIDE_STRING: {
2468 initializer_wide_string_t *const string = &initializer->wide_string;
2469 cnst->conste.v.int_value = string->string.size;
2474 panic("invalid initializer type");
2477 array_type->size = cnst;
2481 if(type != NULL && is_type_function(type)) {
2482 errorf(declaration->source_position,
2483 "initializers not allowed for function types at declator '%Y' (type '%T')",
2484 declaration->symbol, orig_type);
2486 declaration->init.initializer = initializer;
2490 /* parse rest of a declaration without any declarator */
2491 static void parse_anonymous_declaration_rest(
2492 const declaration_specifiers_t *specifiers,
2493 parsed_declaration_func finished_declaration)
2497 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2499 declaration->type = specifiers->type;
2500 declaration->storage_class = specifiers->storage_class;
2501 declaration->source_position = specifiers->source_position;
2503 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2504 warningf(declaration->source_position, "useless storage class in empty declaration");
2507 type_t *type = declaration->type;
2508 switch (type->kind) {
2509 case TYPE_COMPOUND_STRUCT:
2510 case TYPE_COMPOUND_UNION: {
2511 const compound_type_t *compound_type = &type->compound;
2512 if (compound_type->declaration->symbol == NULL) {
2513 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2522 warningf(declaration->source_position, "empty declaration");
2526 finished_declaration(declaration);
2529 static void parse_declaration_rest(declaration_t *ndeclaration,
2530 const declaration_specifiers_t *specifiers,
2531 parsed_declaration_func finished_declaration)
2534 declaration_t *declaration = finished_declaration(ndeclaration);
2536 type_t *orig_type = declaration->type;
2537 type_t *type = skip_typeref(orig_type);
2539 if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
2540 warningf(declaration->source_position,
2541 "variable '%Y' declared 'inline'\n", declaration->symbol);
2544 if(token.type == '=') {
2545 parse_init_declarator_rest(declaration);
2548 if(token.type != ',')
2552 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2557 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2559 /* TODO: check that it was actually a parameter that gets a type */
2561 /* we should have a declaration for the parameter in the current
2563 return record_declaration(declaration);
2566 static void parse_declaration(parsed_declaration_func finished_declaration)
2568 declaration_specifiers_t specifiers;
2569 memset(&specifiers, 0, sizeof(specifiers));
2570 parse_declaration_specifiers(&specifiers);
2572 if(token.type == ';') {
2573 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2575 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2576 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2580 static void parse_kr_declaration_list(declaration_t *declaration)
2582 type_t *type = skip_typeref(declaration->type);
2583 if(!is_type_function(type))
2586 if(!type->function.kr_style_parameters)
2589 /* push function parameters */
2590 int top = environment_top();
2591 context_t *last_context = context;
2592 set_context(&declaration->context);
2594 declaration_t *parameter = declaration->context.declarations;
2595 for( ; parameter != NULL; parameter = parameter->next) {
2596 assert(parameter->parent_context == NULL);
2597 parameter->parent_context = context;
2598 environment_push(parameter);
2601 /* parse declaration list */
2602 while(is_declaration_specifier(&token, false)) {
2603 parse_declaration(finished_kr_declaration);
2606 /* pop function parameters */
2607 assert(context == &declaration->context);
2608 set_context(last_context);
2609 environment_pop_to(top);
2611 /* update function type */
2612 type_t *new_type = duplicate_type(type);
2613 new_type->function.kr_style_parameters = false;
2615 function_parameter_t *parameters = NULL;
2616 function_parameter_t *last_parameter = NULL;
2618 declaration_t *parameter_declaration = declaration->context.declarations;
2619 for( ; parameter_declaration != NULL;
2620 parameter_declaration = parameter_declaration->next) {
2621 type_t *parameter_type = parameter_declaration->type;
2622 if(parameter_type == NULL) {
2624 errorf(HERE, "no type specified for function parameter '%Y'",
2625 parameter_declaration->symbol);
2627 warningf(HERE, "no type specified for function parameter '%Y', using int",
2628 parameter_declaration->symbol);
2629 parameter_type = type_int;
2630 parameter_declaration->type = parameter_type;
2634 semantic_parameter(parameter_declaration);
2635 parameter_type = parameter_declaration->type;
2637 function_parameter_t *function_parameter
2638 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2639 memset(function_parameter, 0, sizeof(function_parameter[0]));
2641 function_parameter->type = parameter_type;
2642 if(last_parameter != NULL) {
2643 last_parameter->next = function_parameter;
2645 parameters = function_parameter;
2647 last_parameter = function_parameter;
2649 new_type->function.parameters = parameters;
2651 type = typehash_insert(new_type);
2652 if(type != new_type) {
2653 obstack_free(type_obst, new_type);
2656 declaration->type = type;
2659 static void parse_external_declaration(void)
2661 /* function-definitions and declarations both start with declaration
2663 declaration_specifiers_t specifiers;
2664 memset(&specifiers, 0, sizeof(specifiers));
2665 parse_declaration_specifiers(&specifiers);
2667 /* must be a declaration */
2668 if(token.type == ';') {
2669 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2673 /* declarator is common to both function-definitions and declarations */
2674 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2676 /* must be a declaration */
2677 if(token.type == ',' || token.type == '=' || token.type == ';') {
2678 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2682 /* must be a function definition */
2683 parse_kr_declaration_list(ndeclaration);
2685 if(token.type != '{') {
2686 parse_error_expected("while parsing function definition", '{', 0);
2691 type_t *type = ndeclaration->type;
2697 /* note that we don't skip typerefs: the standard doesn't allow them here
2698 * (so we can't use is_type_function here) */
2699 if(type->kind != TYPE_FUNCTION) {
2700 errorf(HERE, "declarator '%#T' has a body but is not a function type", type, ndeclaration->symbol);
2705 /* § 6.7.5.3 (14) a function definition with () means no
2706 * parameters (and not unspecified parameters) */
2707 if(type->function.unspecified_parameters) {
2708 type_t *duplicate = duplicate_type(type);
2709 duplicate->function.unspecified_parameters = false;
2711 type = typehash_insert(duplicate);
2712 if(type != duplicate) {
2713 obstack_free(type_obst, duplicate);
2715 ndeclaration->type = type;
2718 declaration_t *const declaration = record_function_definition(ndeclaration);
2719 if(ndeclaration != declaration) {
2720 declaration->context = ndeclaration->context;
2722 type = skip_typeref(declaration->type);
2724 /* push function parameters and switch context */
2725 int top = environment_top();
2726 context_t *last_context = context;
2727 set_context(&declaration->context);
2729 declaration_t *parameter = declaration->context.declarations;
2730 for( ; parameter != NULL; parameter = parameter->next) {
2731 assert(parameter->parent_context == NULL || parameter->parent_context == context);
2732 parameter->parent_context = context;
2733 environment_push(parameter);
2736 if(declaration->init.statement != NULL) {
2737 parser_error_multiple_definition(declaration, token.source_position);
2739 goto end_of_parse_external_declaration;
2741 /* parse function body */
2742 int label_stack_top = label_top();
2743 declaration_t *old_current_function = current_function;
2744 current_function = declaration;
2746 declaration->init.statement = parse_compound_statement();
2748 assert(current_function == declaration);
2749 current_function = old_current_function;
2750 label_pop_to(label_stack_top);
2753 end_of_parse_external_declaration:
2754 assert(context == &declaration->context);
2755 set_context(last_context);
2756 environment_pop_to(top);
2759 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2761 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2762 type->bitfield.base = base;
2763 type->bitfield.size = size;
2768 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2770 /* TODO: check constraints for struct declarations (in specifiers) */
2772 declaration_t *declaration;
2774 if(token.type == ':') {
2777 type_t *base_type = specifiers->type;
2778 expression_t *size = parse_constant_expression();
2780 type_t *type = make_bitfield_type(base_type, size);
2782 declaration = allocate_ast_zero(sizeof(declaration[0]));
2784 declaration->namespc = NAMESPACE_NORMAL;
2785 declaration->storage_class = STORAGE_CLASS_NONE;
2786 declaration->source_position = token.source_position;
2787 declaration->modifiers = specifiers->decl_modifiers;
2788 declaration->type = type;
2790 record_declaration(declaration);
2792 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2794 if(token.type == ':') {
2796 expression_t *size = parse_constant_expression();
2798 type_t *type = make_bitfield_type(declaration->type, size);
2799 declaration->type = type;
2802 record_declaration(declaration);
2804 if(token.type != ',')
2811 static void parse_compound_type_entries(void)
2815 while(token.type != '}' && token.type != T_EOF) {
2816 declaration_specifiers_t specifiers;
2817 memset(&specifiers, 0, sizeof(specifiers));
2818 parse_declaration_specifiers(&specifiers);
2820 parse_struct_declarators(&specifiers);
2822 if(token.type == T_EOF) {
2823 errorf(HERE, "EOF while parsing struct");
2828 static type_t *parse_typename(void)
2830 declaration_specifiers_t specifiers;
2831 memset(&specifiers, 0, sizeof(specifiers));
2832 parse_declaration_specifiers(&specifiers);
2833 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2834 /* TODO: improve error message, user does probably not know what a
2835 * storage class is...
2837 errorf(HERE, "typename may not have a storage class");
2840 type_t *result = parse_abstract_declarator(specifiers.type);
2848 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2849 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2850 expression_t *left);
2852 typedef struct expression_parser_function_t expression_parser_function_t;
2853 struct expression_parser_function_t {
2854 unsigned precedence;
2855 parse_expression_function parser;
2856 unsigned infix_precedence;
2857 parse_expression_infix_function infix_parser;
2860 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2863 * Creates a new invalid expression.
2865 static expression_t *create_invalid_expression(void)
2867 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2868 expression->base.source_position = token.source_position;
2872 static expression_t *expected_expression_error(void)
2874 errorf(HERE, "expected expression, got token '%K'", &token);
2878 return create_invalid_expression();
2882 * Parse a string constant.
2884 static expression_t *parse_string_const(void)
2886 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2887 cnst->base.datatype = type_string;
2888 cnst->string.value = parse_string_literals();
2894 * Parse a wide string constant.
2896 static expression_t *parse_wide_string_const(void)
2898 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2899 cnst->base.datatype = type_wchar_t_ptr;
2900 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2906 * Parse an integer constant.
2908 static expression_t *parse_int_const(void)
2910 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2911 cnst->base.datatype = token.datatype;
2912 cnst->conste.v.int_value = token.v.intvalue;
2920 * Parse a float constant.
2922 static expression_t *parse_float_const(void)
2924 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2925 cnst->base.datatype = token.datatype;
2926 cnst->conste.v.float_value = token.v.floatvalue;
2933 static declaration_t *create_implicit_function(symbol_t *symbol,
2934 const source_position_t source_position)
2936 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
2937 ntype->function.return_type = type_int;
2938 ntype->function.unspecified_parameters = true;
2940 type_t *type = typehash_insert(ntype);
2945 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2947 declaration->storage_class = STORAGE_CLASS_EXTERN;
2948 declaration->type = type;
2949 declaration->symbol = symbol;
2950 declaration->source_position = source_position;
2951 declaration->parent_context = global_context;
2953 environment_push(declaration);
2954 declaration->next = context->declarations;
2955 context->declarations = declaration;
2961 * Creates a return_type (func)(argument_type) function type if not
2964 * @param return_type the return type
2965 * @param argument_type the argument type
2967 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
2969 function_parameter_t *parameter
2970 = obstack_alloc(type_obst, sizeof(parameter[0]));
2971 memset(parameter, 0, sizeof(parameter[0]));
2972 parameter->type = argument_type;
2974 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2975 type->function.return_type = return_type;
2976 type->function.parameters = parameter;
2978 type_t *result = typehash_insert(type);
2979 if(result != type) {
2987 * Creates a function type for some function like builtins.
2989 * @param symbol the symbol describing the builtin
2991 static type_t *get_builtin_symbol_type(symbol_t *symbol)
2993 switch(symbol->ID) {
2994 case T___builtin_alloca:
2995 return make_function_1_type(type_void_ptr, type_size_t);
2996 case T___builtin_nan:
2997 return make_function_1_type(type_double, type_string);
2998 case T___builtin_nanf:
2999 return make_function_1_type(type_float, type_string);
3000 case T___builtin_nand:
3001 return make_function_1_type(type_long_double, type_string);
3002 case T___builtin_va_end:
3003 return make_function_1_type(type_void, type_valist);
3005 panic("not implemented builtin symbol found");
3010 * Performs automatic type cast as described in § 6.3.2.1.
3012 * @param orig_type the original type
3014 static type_t *automatic_type_conversion(type_t *orig_type)
3016 if(orig_type == NULL)
3019 type_t *type = skip_typeref(orig_type);
3020 if(is_type_array(type)) {
3021 array_type_t *array_type = &type->array;
3022 type_t *element_type = array_type->element_type;
3023 unsigned qualifiers = array_type->type.qualifiers;
3025 return make_pointer_type(element_type, qualifiers);
3028 if(is_type_function(type)) {
3029 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3036 * reverts the automatic casts of array to pointer types and function
3037 * to function-pointer types as defined § 6.3.2.1
3039 type_t *revert_automatic_type_conversion(const expression_t *expression)
3041 if(expression->base.datatype == NULL)
3044 switch(expression->kind) {
3045 case EXPR_REFERENCE: {
3046 const reference_expression_t *ref = &expression->reference;
3047 return ref->declaration->type;
3050 const select_expression_t *select = &expression->select;
3051 return select->compound_entry->type;
3053 case EXPR_UNARY_DEREFERENCE: {
3054 expression_t *value = expression->unary.value;
3055 type_t *type = skip_typeref(value->base.datatype);
3056 pointer_type_t *pointer_type = &type->pointer;
3058 return pointer_type->points_to;
3060 case EXPR_BUILTIN_SYMBOL: {
3061 const builtin_symbol_expression_t *builtin
3062 = &expression->builtin_symbol;
3063 return get_builtin_symbol_type(builtin->symbol);
3065 case EXPR_ARRAY_ACCESS: {
3066 const array_access_expression_t *array_access
3067 = &expression->array_access;
3068 const expression_t *array_ref = array_access->array_ref;
3069 type_t *type_left = skip_typeref(array_ref->base.datatype);
3070 assert(is_type_pointer(type_left));
3071 pointer_type_t *pointer_type = &type_left->pointer;
3072 return pointer_type->points_to;
3079 return expression->base.datatype;
3082 static expression_t *parse_reference(void)
3084 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3086 reference_expression_t *ref = &expression->reference;
3087 ref->symbol = token.v.symbol;
3089 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3091 source_position_t source_position = token.source_position;
3094 if(declaration == NULL) {
3095 if (! strict_mode && token.type == '(') {
3096 /* an implicitly defined function */
3097 warningf(HERE, "implicit declaration of function '%Y'",
3100 declaration = create_implicit_function(ref->symbol,
3103 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3108 type_t *type = declaration->type;
3110 /* we always do the auto-type conversions; the & and sizeof parser contains
3111 * code to revert this! */
3112 type = automatic_type_conversion(type);
3114 ref->declaration = declaration;
3115 ref->expression.datatype = type;
3120 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3124 /* TODO check if explicit cast is allowed and issue warnings/errors */
3127 static expression_t *parse_cast(void)
3129 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3131 cast->base.source_position = token.source_position;
3133 type_t *type = parse_typename();
3136 expression_t *value = parse_sub_expression(20);
3138 check_cast_allowed(value, type);
3140 cast->base.datatype = type;
3141 cast->unary.value = value;
3146 static expression_t *parse_statement_expression(void)
3148 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3150 statement_t *statement = parse_compound_statement();
3151 expression->statement.statement = statement;
3152 if(statement == NULL) {
3157 assert(statement->kind == STATEMENT_COMPOUND);
3158 compound_statement_t *compound_statement = &statement->compound;
3160 /* find last statement and use it's type */
3161 const statement_t *last_statement = NULL;
3162 const statement_t *iter = compound_statement->statements;
3163 for( ; iter != NULL; iter = iter->base.next) {
3164 last_statement = iter;
3167 if(last_statement->kind == STATEMENT_EXPRESSION) {
3168 const expression_statement_t *expression_statement
3169 = &last_statement->expression;
3170 expression->base.datatype
3171 = expression_statement->expression->base.datatype;
3173 expression->base.datatype = type_void;
3181 static expression_t *parse_brace_expression(void)
3185 switch(token.type) {
3187 /* gcc extension: a statement expression */
3188 return parse_statement_expression();
3192 return parse_cast();
3194 if(is_typedef_symbol(token.v.symbol)) {
3195 return parse_cast();
3199 expression_t *result = parse_expression();
3205 static expression_t *parse_function_keyword(void)
3210 if (current_function == NULL) {
3211 errorf(HERE, "'__func__' used outside of a function");
3214 string_literal_expression_t *expression
3215 = allocate_ast_zero(sizeof(expression[0]));
3217 expression->expression.kind = EXPR_FUNCTION;
3218 expression->expression.datatype = type_string;
3219 expression->value = current_function->symbol->string;
3221 return (expression_t*) expression;
3224 static expression_t *parse_pretty_function_keyword(void)
3226 eat(T___PRETTY_FUNCTION__);
3229 if (current_function == NULL) {
3230 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3233 string_literal_expression_t *expression
3234 = allocate_ast_zero(sizeof(expression[0]));
3236 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3237 expression->expression.datatype = type_string;
3238 expression->value = current_function->symbol->string;
3240 return (expression_t*) expression;
3243 static designator_t *parse_designator(void)
3245 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3247 if(token.type != T_IDENTIFIER) {
3248 parse_error_expected("while parsing member designator",
3253 result->symbol = token.v.symbol;
3256 designator_t *last_designator = result;
3258 if(token.type == '.') {
3260 if(token.type != T_IDENTIFIER) {
3261 parse_error_expected("while parsing member designator",
3266 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3267 designator->symbol = token.v.symbol;
3270 last_designator->next = designator;
3271 last_designator = designator;
3274 if(token.type == '[') {
3276 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3277 designator->array_access = parse_expression();
3278 if(designator->array_access == NULL) {
3284 last_designator->next = designator;
3285 last_designator = designator;
3294 static expression_t *parse_offsetof(void)
3296 eat(T___builtin_offsetof);
3298 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3299 expression->base.datatype = type_size_t;
3302 expression->offsetofe.type = parse_typename();
3304 expression->offsetofe.designator = parse_designator();
3310 static expression_t *parse_va_start(void)
3312 eat(T___builtin_va_start);
3314 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3317 expression->va_starte.ap = parse_assignment_expression();
3319 expression_t *const expr = parse_assignment_expression();
3320 if (expr->kind == EXPR_REFERENCE) {
3321 declaration_t *const decl = expr->reference.declaration;
3322 if (decl->parent_context == ¤t_function->context &&
3323 decl->next == NULL) {
3324 expression->va_starte.parameter = decl;
3329 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3331 return create_invalid_expression();
3334 static expression_t *parse_va_arg(void)
3336 eat(T___builtin_va_arg);
3338 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3341 expression->va_arge.ap = parse_assignment_expression();
3343 expression->base.datatype = parse_typename();
3349 static expression_t *parse_builtin_symbol(void)
3351 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3353 symbol_t *symbol = token.v.symbol;
3355 expression->builtin_symbol.symbol = symbol;
3358 type_t *type = get_builtin_symbol_type(symbol);
3359 type = automatic_type_conversion(type);
3361 expression->base.datatype = type;
3365 static expression_t *parse_builtin_constant(void)
3367 eat(T___builtin_constant_p);
3369 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3372 expression->builtin_constant.value = parse_assignment_expression();
3374 expression->base.datatype = type_int;
3379 static expression_t *parse_builtin_prefetch(void)
3381 eat(T___builtin_prefetch);
3383 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3386 expression->builtin_prefetch.adr = parse_assignment_expression();
3387 if (token.type == ',') {
3389 expression->builtin_prefetch.rw = parse_assignment_expression();
3391 if (token.type == ',') {
3393 expression->builtin_prefetch.locality = parse_assignment_expression();
3396 expression->base.datatype = type_void;
3401 static expression_t *parse_compare_builtin(void)
3403 expression_t *expression;
3405 switch(token.type) {
3406 case T___builtin_isgreater:
3407 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3409 case T___builtin_isgreaterequal:
3410 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3412 case T___builtin_isless:
3413 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3415 case T___builtin_islessequal:
3416 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3418 case T___builtin_islessgreater:
3419 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3421 case T___builtin_isunordered:
3422 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3425 panic("invalid compare builtin found");
3431 expression->binary.left = parse_assignment_expression();
3433 expression->binary.right = parse_assignment_expression();
3436 type_t *orig_type_left = expression->binary.left->base.datatype;
3437 type_t *orig_type_right = expression->binary.right->base.datatype;
3438 if(orig_type_left == NULL || orig_type_right == NULL)
3441 type_t *type_left = skip_typeref(orig_type_left);
3442 type_t *type_right = skip_typeref(orig_type_right);
3443 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3444 type_error_incompatible("invalid operands in comparison",
3445 token.source_position, type_left, type_right);
3447 semantic_comparison(&expression->binary);
3453 static expression_t *parse_builtin_expect(void)
3455 eat(T___builtin_expect);
3457 expression_t *expression
3458 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3461 expression->binary.left = parse_assignment_expression();
3463 expression->binary.right = parse_constant_expression();
3466 expression->base.datatype = expression->binary.left->base.datatype;
3471 static expression_t *parse_assume(void) {
3474 expression_t *expression
3475 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3478 expression->unary.value = parse_assignment_expression();
3481 expression->base.datatype = type_void;
3485 static expression_t *parse_alignof(void) {
3488 expression_t *expression
3489 = allocate_expression_zero(EXPR_ALIGNOF);
3492 expression->alignofe.type = parse_typename();
3495 expression->base.datatype = type_size_t;
3499 static expression_t *parse_primary_expression(void)
3501 switch(token.type) {
3503 return parse_int_const();
3504 case T_FLOATINGPOINT:
3505 return parse_float_const();
3506 case T_STRING_LITERAL:
3507 return parse_string_const();
3508 case T_WIDE_STRING_LITERAL:
3509 return parse_wide_string_const();
3511 return parse_reference();
3512 case T___FUNCTION__:
3514 return parse_function_keyword();
3515 case T___PRETTY_FUNCTION__:
3516 return parse_pretty_function_keyword();
3517 case T___builtin_offsetof:
3518 return parse_offsetof();
3519 case T___builtin_va_start:
3520 return parse_va_start();
3521 case T___builtin_va_arg:
3522 return parse_va_arg();
3523 case T___builtin_expect:
3524 return parse_builtin_expect();
3525 case T___builtin_nanf:
3526 case T___builtin_alloca:
3527 case T___builtin_va_end:
3528 return parse_builtin_symbol();
3529 case T___builtin_isgreater:
3530 case T___builtin_isgreaterequal:
3531 case T___builtin_isless:
3532 case T___builtin_islessequal:
3533 case T___builtin_islessgreater:
3534 case T___builtin_isunordered:
3535 return parse_compare_builtin();
3536 case T___builtin_constant_p:
3537 return parse_builtin_constant();
3538 case T___builtin_prefetch:
3539 return parse_builtin_prefetch();
3541 return parse_alignof();
3543 return parse_assume();
3546 return parse_brace_expression();
3549 errorf(HERE, "unexpected token '%K'", &token);
3552 return create_invalid_expression();
3555 static expression_t *parse_array_expression(unsigned precedence,
3562 expression_t *inside = parse_expression();
3564 array_access_expression_t *array_access
3565 = allocate_ast_zero(sizeof(array_access[0]));
3567 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3569 type_t *type_left = left->base.datatype;
3570 type_t *type_inside = inside->base.datatype;
3571 type_t *return_type = NULL;
3573 if(type_left != NULL && type_inside != NULL) {
3574 type_left = skip_typeref(type_left);
3575 type_inside = skip_typeref(type_inside);
3577 if(is_type_pointer(type_left)) {
3578 pointer_type_t *pointer = &type_left->pointer;
3579 return_type = pointer->points_to;
3580 array_access->array_ref = left;
3581 array_access->index = inside;
3582 } else if(is_type_pointer(type_inside)) {
3583 pointer_type_t *pointer = &type_inside->pointer;
3584 return_type = pointer->points_to;
3585 array_access->array_ref = inside;
3586 array_access->index = left;
3587 array_access->flipped = true;
3589 errorf(HERE, "array access on object with non-pointer types '%T', '%T'", type_left, type_inside);
3592 array_access->array_ref = left;
3593 array_access->index = inside;
3596 if(token.type != ']') {
3597 parse_error_expected("Problem while parsing array access", ']', 0);
3598 return (expression_t*) array_access;
3602 return_type = automatic_type_conversion(return_type);
3603 array_access->expression.datatype = return_type;
3605 return (expression_t*) array_access;
3608 static expression_t *parse_sizeof(unsigned precedence)
3612 sizeof_expression_t *sizeof_expression
3613 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3614 sizeof_expression->expression.kind = EXPR_SIZEOF;
3615 sizeof_expression->expression.datatype = type_size_t;
3617 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3619 sizeof_expression->type = parse_typename();
3622 expression_t *expression = parse_sub_expression(precedence);
3623 expression->base.datatype = revert_automatic_type_conversion(expression);
3625 sizeof_expression->type = expression->base.datatype;
3626 sizeof_expression->size_expression = expression;
3629 return (expression_t*) sizeof_expression;
3632 static expression_t *parse_select_expression(unsigned precedence,
3633 expression_t *compound)
3636 assert(token.type == '.' || token.type == T_MINUSGREATER);
3638 bool is_pointer = (token.type == T_MINUSGREATER);
3641 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3642 select->select.compound = compound;
3644 if(token.type != T_IDENTIFIER) {
3645 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3648 symbol_t *symbol = token.v.symbol;
3649 select->select.symbol = symbol;
3652 type_t *orig_type = compound->base.datatype;
3653 if(orig_type == NULL)
3654 return create_invalid_expression();
3656 type_t *type = skip_typeref(orig_type);
3658 type_t *type_left = type;
3660 if(type->kind != TYPE_POINTER) {
3661 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3662 return create_invalid_expression();
3664 pointer_type_t *pointer_type = &type->pointer;
3665 type_left = pointer_type->points_to;
3667 type_left = skip_typeref(type_left);
3669 if(type_left->kind != TYPE_COMPOUND_STRUCT
3670 && type_left->kind != TYPE_COMPOUND_UNION) {
3671 errorf(HERE, "request for member '%Y' in something not a struct or "
3672 "union, but '%T'", symbol, type_left);
3673 return create_invalid_expression();
3676 compound_type_t *compound_type = &type_left->compound;
3677 declaration_t *declaration = compound_type->declaration;
3679 if(!declaration->init.is_defined) {
3680 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3682 return create_invalid_expression();
3685 declaration_t *iter = declaration->context.declarations;
3686 for( ; iter != NULL; iter = iter->next) {
3687 if(iter->symbol == symbol) {
3692 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3693 return create_invalid_expression();
3696 /* we always do the auto-type conversions; the & and sizeof parser contains
3697 * code to revert this! */
3698 type_t *expression_type = automatic_type_conversion(iter->type);
3700 select->select.compound_entry = iter;
3701 select->base.datatype = expression_type;
3703 if(expression_type->kind == TYPE_BITFIELD) {
3704 expression_t *extract
3705 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3706 extract->unary.value = select;
3707 extract->base.datatype = expression_type->bitfield.base;
3716 * Parse a call expression, ie. expression '( ... )'.
3718 * @param expression the function address
3720 static expression_t *parse_call_expression(unsigned precedence,
3721 expression_t *expression)
3724 expression_t *result = allocate_expression_zero(EXPR_CALL);
3726 call_expression_t *call = &result->call;
3727 call->function = expression;
3729 function_type_t *function_type = NULL;
3730 type_t *orig_type = expression->base.datatype;
3731 if(orig_type != NULL) {
3732 type_t *type = skip_typeref(orig_type);
3734 if(is_type_pointer(type)) {
3735 pointer_type_t *pointer_type = &type->pointer;
3737 type = skip_typeref(pointer_type->points_to);
3739 if (is_type_function(type)) {
3740 function_type = &type->function;
3741 call->expression.datatype = function_type->return_type;
3744 if(function_type == NULL) {
3745 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3747 function_type = NULL;
3748 call->expression.datatype = NULL;
3752 /* parse arguments */
3755 if(token.type != ')') {
3756 call_argument_t *last_argument = NULL;
3759 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3761 argument->expression = parse_assignment_expression();
3762 if(last_argument == NULL) {
3763 call->arguments = argument;
3765 last_argument->next = argument;
3767 last_argument = argument;
3769 if(token.type != ',')
3776 if(function_type != NULL) {
3777 function_parameter_t *parameter = function_type->parameters;
3778 call_argument_t *argument = call->arguments;
3779 for( ; parameter != NULL && argument != NULL;
3780 parameter = parameter->next, argument = argument->next) {
3781 type_t *expected_type = parameter->type;
3782 /* TODO report context in error messages */
3783 argument->expression = create_implicit_cast(argument->expression,
3786 /* too few parameters */
3787 if(parameter != NULL) {
3788 errorf(HERE, "too few arguments to function '%E'", expression);
3789 } else if(argument != NULL) {
3790 /* too many parameters */
3791 if(!function_type->variadic
3792 && !function_type->unspecified_parameters) {
3793 errorf(HERE, "too many arguments to function '%E'", expression);
3795 /* do default promotion */
3796 for( ; argument != NULL; argument = argument->next) {
3797 type_t *type = argument->expression->base.datatype;
3802 type = skip_typeref(type);
3803 if(is_type_integer(type)) {
3804 type = promote_integer(type);
3805 } else if(type == type_float) {
3809 argument->expression
3810 = create_implicit_cast(argument->expression, type);
3813 check_format(&result->call);
3816 check_format(&result->call);
3823 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3825 static bool same_compound_type(const type_t *type1, const type_t *type2)
3827 if(!is_type_compound(type1))
3829 if(type1->kind != type2->kind)
3832 const compound_type_t *compound1 = &type1->compound;
3833 const compound_type_t *compound2 = &type2->compound;
3835 return compound1->declaration == compound2->declaration;
3839 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3841 * @param expression the conditional expression
3843 static expression_t *parse_conditional_expression(unsigned precedence,
3844 expression_t *expression)
3848 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3850 conditional_expression_t *conditional = &result->conditional;
3851 conditional->condition = expression;
3854 type_t *condition_type_orig = expression->base.datatype;
3855 if(condition_type_orig != NULL) {
3856 type_t *condition_type = skip_typeref(condition_type_orig);
3857 if(condition_type != NULL && !is_type_scalar(condition_type)) {
3858 type_error("expected a scalar type in conditional condition",
3859 expression->base.source_position, condition_type_orig);
3863 expression_t *true_expression = parse_expression();
3865 expression_t *false_expression = parse_sub_expression(precedence);
3867 conditional->true_expression = true_expression;
3868 conditional->false_expression = false_expression;
3870 type_t *orig_true_type = true_expression->base.datatype;
3871 type_t *orig_false_type = false_expression->base.datatype;
3872 if(orig_true_type == NULL || orig_false_type == NULL)
3875 type_t *true_type = skip_typeref(orig_true_type);
3876 type_t *false_type = skip_typeref(orig_false_type);
3879 type_t *result_type = NULL;
3880 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3881 result_type = semantic_arithmetic(true_type, false_type);
3883 true_expression = create_implicit_cast(true_expression, result_type);
3884 false_expression = create_implicit_cast(false_expression, result_type);
3886 conditional->true_expression = true_expression;
3887 conditional->false_expression = false_expression;
3888 conditional->expression.datatype = result_type;
3889 } else if (same_compound_type(true_type, false_type)
3890 || (is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3891 is_type_atomic(false_type, ATOMIC_TYPE_VOID))) {
3892 /* just take 1 of the 2 types */
3893 result_type = true_type;
3894 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3895 && pointers_compatible(true_type, false_type)) {
3897 result_type = true_type;
3900 type_error_incompatible("while parsing conditional",
3901 expression->base.source_position, true_type,
3905 conditional->expression.datatype = result_type;
3910 * Parse an extension expression.
3912 static expression_t *parse_extension(unsigned precedence)
3914 eat(T___extension__);
3916 /* TODO enable extensions */
3917 expression_t *expression = parse_sub_expression(precedence);
3918 /* TODO disable extensions */
3922 static expression_t *parse_builtin_classify_type(const unsigned precedence)
3924 eat(T___builtin_classify_type);
3926 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
3927 result->base.datatype = type_int;
3930 expression_t *expression = parse_sub_expression(precedence);
3932 result->classify_type.type_expression = expression;
3937 static void semantic_incdec(unary_expression_t *expression)
3939 type_t *orig_type = expression->value->base.datatype;
3940 if(orig_type == NULL)
3943 type_t *type = skip_typeref(orig_type);
3944 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
3945 /* TODO: improve error message */
3946 errorf(HERE, "operation needs an arithmetic or pointer type");
3950 expression->expression.datatype = orig_type;
3953 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
3955 type_t *orig_type = expression->value->base.datatype;
3956 if(orig_type == NULL)
3959 type_t *type = skip_typeref(orig_type);
3960 if(!is_type_arithmetic(type)) {
3961 /* TODO: improve error message */
3962 errorf(HERE, "operation needs an arithmetic type");
3966 expression->expression.datatype = orig_type;
3969 static void semantic_unexpr_scalar(unary_expression_t *expression)
3971 type_t *orig_type = expression->value->base.datatype;
3972 if(orig_type == NULL)
3975 type_t *type = skip_typeref(orig_type);
3976 if (!is_type_scalar(type)) {
3977 errorf(HERE, "operand of ! must be of scalar type");
3981 expression->expression.datatype = orig_type;
3984 static void semantic_unexpr_integer(unary_expression_t *expression)
3986 type_t *orig_type = expression->value->base.datatype;
3987 if(orig_type == NULL)
3990 type_t *type = skip_typeref(orig_type);
3991 if (!is_type_integer(type)) {
3992 errorf(HERE, "operand of ~ must be of integer type");
3996 expression->expression.datatype = orig_type;
3999 static void semantic_dereference(unary_expression_t *expression)
4001 type_t *orig_type = expression->value->base.datatype;
4002 if(orig_type == NULL)
4005 type_t *type = skip_typeref(orig_type);
4006 if(!is_type_pointer(type)) {
4007 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4011 pointer_type_t *pointer_type = &type->pointer;
4012 type_t *result_type = pointer_type->points_to;
4014 result_type = automatic_type_conversion(result_type);
4015 expression->expression.datatype = result_type;
4019 * Check the semantic of the address taken expression.
4021 static void semantic_take_addr(unary_expression_t *expression)
4023 expression_t *value = expression->value;
4024 value->base.datatype = revert_automatic_type_conversion(value);
4026 type_t *orig_type = value->base.datatype;
4027 if(orig_type == NULL)
4030 if(value->kind == EXPR_REFERENCE) {
4031 reference_expression_t *reference = (reference_expression_t*) value;
4032 declaration_t *declaration = reference->declaration;
4033 if(declaration != NULL) {
4034 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4035 errorf(expression->expression.source_position,
4036 "address of register variable '%Y' requested",
4037 declaration->symbol);
4039 declaration->address_taken = 1;
4043 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4046 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4047 static expression_t *parse_##unexpression_type(unsigned precedence) \
4051 expression_t *unary_expression \
4052 = allocate_expression_zero(unexpression_type); \
4053 unary_expression->base.source_position = HERE; \
4054 unary_expression->unary.value = parse_sub_expression(precedence); \
4056 sfunc(&unary_expression->unary); \
4058 return unary_expression; \
4061 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4062 semantic_unexpr_arithmetic)
4063 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4064 semantic_unexpr_arithmetic)
4065 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4066 semantic_unexpr_scalar)
4067 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4068 semantic_dereference)
4069 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4071 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4072 semantic_unexpr_integer)
4073 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4075 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4078 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4080 static expression_t *parse_##unexpression_type(unsigned precedence, \
4081 expression_t *left) \
4083 (void) precedence; \
4086 expression_t *unary_expression \
4087 = allocate_expression_zero(unexpression_type); \
4088 unary_expression->unary.value = left; \
4090 sfunc(&unary_expression->unary); \
4092 return unary_expression; \
4095 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4096 EXPR_UNARY_POSTFIX_INCREMENT,
4098 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4099 EXPR_UNARY_POSTFIX_DECREMENT,
4102 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4104 /* TODO: handle complex + imaginary types */
4106 /* § 6.3.1.8 Usual arithmetic conversions */
4107 if(type_left == type_long_double || type_right == type_long_double) {
4108 return type_long_double;
4109 } else if(type_left == type_double || type_right == type_double) {
4111 } else if(type_left == type_float || type_right == type_float) {
4115 type_right = promote_integer(type_right);
4116 type_left = promote_integer(type_left);
4118 if(type_left == type_right)
4121 bool signed_left = is_type_signed(type_left);
4122 bool signed_right = is_type_signed(type_right);
4123 int rank_left = get_rank(type_left);
4124 int rank_right = get_rank(type_right);
4125 if(rank_left < rank_right) {
4126 if(signed_left == signed_right || !signed_right) {
4132 if(signed_left == signed_right || !signed_left) {
4141 * Check the semantic restrictions for a binary expression.
4143 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4145 expression_t *left = expression->left;
4146 expression_t *right = expression->right;
4147 type_t *orig_type_left = left->base.datatype;
4148 type_t *orig_type_right = right->base.datatype;
4150 if(orig_type_left == NULL || orig_type_right == NULL)
4153 type_t *type_left = skip_typeref(orig_type_left);
4154 type_t *type_right = skip_typeref(orig_type_right);
4156 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4157 /* TODO: improve error message */
4158 errorf(HERE, "operation needs arithmetic types");
4162 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4163 expression->left = create_implicit_cast(left, arithmetic_type);
4164 expression->right = create_implicit_cast(right, arithmetic_type);
4165 expression->expression.datatype = arithmetic_type;
4168 static void semantic_shift_op(binary_expression_t *expression)
4170 expression_t *left = expression->left;
4171 expression_t *right = expression->right;
4172 type_t *orig_type_left = left->base.datatype;
4173 type_t *orig_type_right = right->base.datatype;
4175 if(orig_type_left == NULL || orig_type_right == NULL)
4178 type_t *type_left = skip_typeref(orig_type_left);
4179 type_t *type_right = skip_typeref(orig_type_right);
4181 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4182 /* TODO: improve error message */
4183 errorf(HERE, "operation needs integer types");
4187 type_left = promote_integer(type_left);
4188 type_right = promote_integer(type_right);
4190 expression->left = create_implicit_cast(left, type_left);
4191 expression->right = create_implicit_cast(right, type_right);
4192 expression->expression.datatype = type_left;
4195 static void semantic_add(binary_expression_t *expression)
4197 expression_t *left = expression->left;
4198 expression_t *right = expression->right;
4199 type_t *orig_type_left = left->base.datatype;
4200 type_t *orig_type_right = right->base.datatype;
4202 if(orig_type_left == NULL || orig_type_right == NULL)
4205 type_t *type_left = skip_typeref(orig_type_left);
4206 type_t *type_right = skip_typeref(orig_type_right);
4209 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4210 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4211 expression->left = create_implicit_cast(left, arithmetic_type);
4212 expression->right = create_implicit_cast(right, arithmetic_type);
4213 expression->expression.datatype = arithmetic_type;
4215 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4216 expression->expression.datatype = type_left;
4217 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4218 expression->expression.datatype = type_right;
4220 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4224 static void semantic_sub(binary_expression_t *expression)
4226 expression_t *left = expression->left;
4227 expression_t *right = expression->right;
4228 type_t *orig_type_left = left->base.datatype;
4229 type_t *orig_type_right = right->base.datatype;
4231 if(orig_type_left == NULL || orig_type_right == NULL)
4234 type_t *type_left = skip_typeref(orig_type_left);
4235 type_t *type_right = skip_typeref(orig_type_right);
4238 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4239 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4240 expression->left = create_implicit_cast(left, arithmetic_type);
4241 expression->right = create_implicit_cast(right, arithmetic_type);
4242 expression->expression.datatype = arithmetic_type;
4244 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4245 expression->expression.datatype = type_left;
4246 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4247 if(!pointers_compatible(type_left, type_right)) {
4248 errorf(HERE, "pointers to incompatible objects to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4250 expression->expression.datatype = type_ptrdiff_t;
4253 errorf(HERE, "invalid operands to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4257 static void semantic_comparison(binary_expression_t *expression)
4259 expression_t *left = expression->left;
4260 expression_t *right = expression->right;
4261 type_t *orig_type_left = left->base.datatype;
4262 type_t *orig_type_right = right->base.datatype;
4264 if(orig_type_left == NULL || orig_type_right == NULL)
4267 type_t *type_left = skip_typeref(orig_type_left);
4268 type_t *type_right = skip_typeref(orig_type_right);
4270 /* TODO non-arithmetic types */
4271 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4272 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4273 expression->left = create_implicit_cast(left, arithmetic_type);
4274 expression->right = create_implicit_cast(right, arithmetic_type);
4275 expression->expression.datatype = arithmetic_type;
4276 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4277 /* TODO check compatibility */
4278 } else if (is_type_pointer(type_left)) {
4279 expression->right = create_implicit_cast(right, type_left);
4280 } else if (is_type_pointer(type_right)) {
4281 expression->left = create_implicit_cast(left, type_right);
4283 type_error_incompatible("invalid operands in comparison",
4284 token.source_position, type_left, type_right);
4286 expression->expression.datatype = type_int;
4289 static void semantic_arithmetic_assign(binary_expression_t *expression)
4291 expression_t *left = expression->left;
4292 expression_t *right = expression->right;
4293 type_t *orig_type_left = left->base.datatype;
4294 type_t *orig_type_right = right->base.datatype;
4296 if(orig_type_left == NULL || orig_type_right == NULL)
4299 type_t *type_left = skip_typeref(orig_type_left);
4300 type_t *type_right = skip_typeref(orig_type_right);
4302 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4303 /* TODO: improve error message */
4304 errorf(HERE, "operation needs arithmetic types");
4308 /* combined instructions are tricky. We can't create an implicit cast on
4309 * the left side, because we need the uncasted form for the store.
4310 * The ast2firm pass has to know that left_type must be right_type
4311 * for the arithmetic operation and create a cast by itself */
4312 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4313 expression->right = create_implicit_cast(right, arithmetic_type);
4314 expression->expression.datatype = type_left;
4317 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4319 expression_t *left = expression->left;
4320 expression_t *right = expression->right;
4321 type_t *orig_type_left = left->base.datatype;
4322 type_t *orig_type_right = right->base.datatype;
4324 if(orig_type_left == NULL || orig_type_right == NULL)
4327 type_t *type_left = skip_typeref(orig_type_left);
4328 type_t *type_right = skip_typeref(orig_type_right);
4330 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4331 /* combined instructions are tricky. We can't create an implicit cast on
4332 * the left side, because we need the uncasted form for the store.
4333 * The ast2firm pass has to know that left_type must be right_type
4334 * for the arithmetic operation and create a cast by itself */
4335 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4336 expression->right = create_implicit_cast(right, arithmetic_type);
4337 expression->expression.datatype = type_left;
4338 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4339 expression->expression.datatype = type_left;
4341 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4347 * Check the semantic restrictions of a logical expression.
4349 static void semantic_logical_op(binary_expression_t *expression)
4351 expression_t *left = expression->left;
4352 expression_t *right = expression->right;
4353 type_t *orig_type_left = left->base.datatype;
4354 type_t *orig_type_right = right->base.datatype;
4356 if(orig_type_left == NULL || orig_type_right == NULL)
4359 type_t *type_left = skip_typeref(orig_type_left);
4360 type_t *type_right = skip_typeref(orig_type_right);
4362 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4363 /* TODO: improve error message */
4364 errorf(HERE, "operation needs scalar types");
4368 expression->expression.datatype = type_int;
4372 * Checks if a compound type has constant fields.
4374 static bool has_const_fields(const compound_type_t *type)
4376 const context_t *context = &type->declaration->context;
4377 const declaration_t *declaration = context->declarations;
4379 for (; declaration != NULL; declaration = declaration->next) {
4380 if (declaration->namespc != NAMESPACE_NORMAL)
4383 const type_t *decl_type = skip_typeref(declaration->type);
4384 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4392 * Check the semantic restrictions of a binary assign expression.
4394 static void semantic_binexpr_assign(binary_expression_t *expression)
4396 expression_t *left = expression->left;
4397 type_t *orig_type_left = left->base.datatype;
4399 if(orig_type_left == NULL)
4402 type_t *type_left = revert_automatic_type_conversion(left);
4403 type_left = skip_typeref(orig_type_left);
4405 /* must be a modifiable lvalue */
4406 if (is_type_array(type_left)) {
4407 errorf(HERE, "cannot assign to arrays ('%E')", left);
4410 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4411 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4415 if(is_type_incomplete(type_left)) {
4417 "left-hand side of assignment '%E' has incomplete type '%T'",
4418 left, orig_type_left);
4421 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4422 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4423 left, orig_type_left);
4427 semantic_assign(orig_type_left, &expression->right, "assignment");
4429 expression->expression.datatype = orig_type_left;
4432 static void semantic_comma(binary_expression_t *expression)
4434 expression->expression.datatype = expression->right->base.datatype;
4437 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4438 static expression_t *parse_##binexpression_type(unsigned precedence, \
4439 expression_t *left) \
4443 expression_t *right = parse_sub_expression(precedence + lr); \
4445 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4446 binexpr->binary.left = left; \
4447 binexpr->binary.right = right; \
4448 sfunc(&binexpr->binary); \
4453 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4454 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4455 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4456 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4457 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4458 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4459 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4460 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4461 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4463 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4464 semantic_comparison, 1)
4465 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4466 semantic_comparison, 1)
4467 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4468 semantic_comparison, 1)
4469 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4470 semantic_comparison, 1)
4472 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4473 semantic_binexpr_arithmetic, 1)
4474 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4475 semantic_binexpr_arithmetic, 1)
4476 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4477 semantic_binexpr_arithmetic, 1)
4478 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4479 semantic_logical_op, 1)
4480 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4481 semantic_logical_op, 1)
4482 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4483 semantic_shift_op, 1)
4484 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4485 semantic_shift_op, 1)
4486 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4487 semantic_arithmetic_addsubb_assign, 0)
4488 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4489 semantic_arithmetic_addsubb_assign, 0)
4490 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4491 semantic_arithmetic_assign, 0)
4492 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4493 semantic_arithmetic_assign, 0)
4494 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4495 semantic_arithmetic_assign, 0)
4496 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4497 semantic_arithmetic_assign, 0)
4498 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4499 semantic_arithmetic_assign, 0)
4500 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4501 semantic_arithmetic_assign, 0)
4502 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4503 semantic_arithmetic_assign, 0)
4504 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4505 semantic_arithmetic_assign, 0)
4507 static expression_t *parse_sub_expression(unsigned precedence)
4509 if(token.type < 0) {
4510 return expected_expression_error();
4513 expression_parser_function_t *parser
4514 = &expression_parsers[token.type];
4515 source_position_t source_position = token.source_position;
4518 if(parser->parser != NULL) {
4519 left = parser->parser(parser->precedence);
4521 left = parse_primary_expression();
4523 assert(left != NULL);
4524 left->base.source_position = source_position;
4527 if(token.type < 0) {
4528 return expected_expression_error();
4531 parser = &expression_parsers[token.type];
4532 if(parser->infix_parser == NULL)
4534 if(parser->infix_precedence < precedence)
4537 left = parser->infix_parser(parser->infix_precedence, left);
4539 assert(left != NULL);
4540 assert(left->kind != EXPR_UNKNOWN);
4541 left->base.source_position = source_position;
4548 * Parse an expression.
4550 static expression_t *parse_expression(void)
4552 return parse_sub_expression(1);
4556 * Register a parser for a prefix-like operator with given precedence.
4558 * @param parser the parser function
4559 * @param token_type the token type of the prefix token
4560 * @param precedence the precedence of the operator
4562 static void register_expression_parser(parse_expression_function parser,
4563 int token_type, unsigned precedence)
4565 expression_parser_function_t *entry = &expression_parsers[token_type];
4567 if(entry->parser != NULL) {
4568 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4569 panic("trying to register multiple expression parsers for a token");
4571 entry->parser = parser;
4572 entry->precedence = precedence;
4576 * Register a parser for an infix operator with given precedence.
4578 * @param parser the parser function
4579 * @param token_type the token type of the infix operator
4580 * @param precedence the precedence of the operator
4582 static void register_infix_parser(parse_expression_infix_function parser,
4583 int token_type, unsigned precedence)
4585 expression_parser_function_t *entry = &expression_parsers[token_type];
4587 if(entry->infix_parser != NULL) {
4588 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4589 panic("trying to register multiple infix expression parsers for a "
4592 entry->infix_parser = parser;
4593 entry->infix_precedence = precedence;
4597 * Initialize the expression parsers.
4599 static void init_expression_parsers(void)
4601 memset(&expression_parsers, 0, sizeof(expression_parsers));
4603 register_infix_parser(parse_array_expression, '[', 30);
4604 register_infix_parser(parse_call_expression, '(', 30);
4605 register_infix_parser(parse_select_expression, '.', 30);
4606 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4607 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4609 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4612 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4613 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4614 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4615 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4616 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4617 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4618 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4619 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4620 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4621 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4622 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4623 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4624 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4625 T_EXCLAMATIONMARKEQUAL, 13);
4626 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4627 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4628 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4629 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4630 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4631 register_infix_parser(parse_conditional_expression, '?', 7);
4632 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4633 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4634 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4635 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4636 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4637 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4638 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4639 T_LESSLESSEQUAL, 2);
4640 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4641 T_GREATERGREATEREQUAL, 2);
4642 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4644 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4646 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4649 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4651 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4652 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4653 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4654 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4655 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4656 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4657 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4659 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4661 register_expression_parser(parse_sizeof, T_sizeof, 25);
4662 register_expression_parser(parse_extension, T___extension__, 25);
4663 register_expression_parser(parse_builtin_classify_type,
4664 T___builtin_classify_type, 25);
4668 * Parse a asm statement constraints specification.
4670 static asm_constraint_t *parse_asm_constraints(void)
4672 asm_constraint_t *result = NULL;
4673 asm_constraint_t *last = NULL;
4675 while(token.type == T_STRING_LITERAL || token.type == '[') {
4676 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4677 memset(constraint, 0, sizeof(constraint[0]));
4679 if(token.type == '[') {
4681 if(token.type != T_IDENTIFIER) {
4682 parse_error_expected("while parsing asm constraint",
4686 constraint->symbol = token.v.symbol;
4691 constraint->constraints = parse_string_literals();
4693 constraint->expression = parse_expression();
4697 last->next = constraint;
4699 result = constraint;
4703 if(token.type != ',')
4712 * Parse a asm statement clobber specification.
4714 static asm_clobber_t *parse_asm_clobbers(void)
4716 asm_clobber_t *result = NULL;
4717 asm_clobber_t *last = NULL;
4719 while(token.type == T_STRING_LITERAL) {
4720 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4721 clobber->clobber = parse_string_literals();
4724 last->next = clobber;
4730 if(token.type != ',')
4739 * Parse an asm statement.
4741 static statement_t *parse_asm_statement(void)
4745 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4746 statement->base.source_position = token.source_position;
4748 asm_statement_t *asm_statement = &statement->asms;
4750 if(token.type == T_volatile) {
4752 asm_statement->is_volatile = true;
4756 asm_statement->asm_text = parse_string_literals();
4758 if(token.type != ':')
4762 asm_statement->inputs = parse_asm_constraints();
4763 if(token.type != ':')
4767 asm_statement->outputs = parse_asm_constraints();
4768 if(token.type != ':')
4772 asm_statement->clobbers = parse_asm_clobbers();
4781 * Parse a case statement.
4783 static statement_t *parse_case_statement(void)
4787 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4789 statement->base.source_position = token.source_position;
4790 statement->case_label.expression = parse_expression();
4793 statement->case_label.label_statement = parse_statement();
4799 * Parse a default statement.
4801 static statement_t *parse_default_statement(void)
4805 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4807 statement->base.source_position = token.source_position;
4810 statement->label.label_statement = parse_statement();
4816 * Return the declaration for a given label symbol or create a new one.
4818 static declaration_t *get_label(symbol_t *symbol)
4820 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4821 assert(current_function != NULL);
4822 /* if we found a label in the same function, then we already created the
4824 if(candidate != NULL
4825 && candidate->parent_context == ¤t_function->context) {
4829 /* otherwise we need to create a new one */
4830 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
4831 declaration->namespc = NAMESPACE_LABEL;
4832 declaration->symbol = symbol;
4834 label_push(declaration);
4840 * Parse a label statement.
4842 static statement_t *parse_label_statement(void)
4844 assert(token.type == T_IDENTIFIER);
4845 symbol_t *symbol = token.v.symbol;
4848 declaration_t *label = get_label(symbol);
4850 /* if source position is already set then the label is defined twice,
4851 * otherwise it was just mentioned in a goto so far */
4852 if(label->source_position.input_name != NULL) {
4853 errorf(HERE, "duplicate label '%Y'", symbol);
4854 errorf(label->source_position, "previous definition of '%Y' was here",
4857 label->source_position = token.source_position;
4860 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
4862 label_statement->statement.kind = STATEMENT_LABEL;
4863 label_statement->statement.source_position = token.source_position;
4864 label_statement->label = label;
4868 if(token.type == '}') {
4869 /* TODO only warn? */
4870 errorf(HERE, "label at end of compound statement");
4871 return (statement_t*) label_statement;
4873 label_statement->label_statement = parse_statement();
4876 return (statement_t*) label_statement;
4880 * Parse an if statement.
4882 static statement_t *parse_if(void)
4886 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4887 statement->statement.kind = STATEMENT_IF;
4888 statement->statement.source_position = token.source_position;
4891 statement->condition = parse_expression();
4894 statement->true_statement = parse_statement();
4895 if(token.type == T_else) {
4897 statement->false_statement = parse_statement();
4900 return (statement_t*) statement;
4904 * Parse a switch statement.
4906 static statement_t *parse_switch(void)
4910 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4911 statement->statement.kind = STATEMENT_SWITCH;
4912 statement->statement.source_position = token.source_position;
4915 statement->expression = parse_expression();
4917 statement->body = parse_statement();
4919 return (statement_t*) statement;
4923 * Parse a while statement.
4925 static statement_t *parse_while(void)
4929 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4930 statement->statement.kind = STATEMENT_WHILE;
4931 statement->statement.source_position = token.source_position;
4934 statement->condition = parse_expression();
4936 statement->body = parse_statement();
4938 return (statement_t*) statement;
4942 * Parse a do statement.
4944 static statement_t *parse_do(void)
4948 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4949 statement->statement.kind = STATEMENT_DO_WHILE;
4950 statement->statement.source_position = token.source_position;
4952 statement->body = parse_statement();
4955 statement->condition = parse_expression();
4959 return (statement_t*) statement;
4963 * Parse a for statement.
4965 static statement_t *parse_for(void)
4969 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4970 statement->statement.kind = STATEMENT_FOR;
4971 statement->statement.source_position = token.source_position;
4975 int top = environment_top();
4976 context_t *last_context = context;
4977 set_context(&statement->context);
4979 if(token.type != ';') {
4980 if(is_declaration_specifier(&token, false)) {
4981 parse_declaration(record_declaration);
4983 statement->initialisation = parse_expression();
4990 if(token.type != ';') {
4991 statement->condition = parse_expression();
4994 if(token.type != ')') {
4995 statement->step = parse_expression();
4998 statement->body = parse_statement();
5000 assert(context == &statement->context);
5001 set_context(last_context);
5002 environment_pop_to(top);
5004 return (statement_t*) statement;
5008 * Parse a goto statement.
5010 static statement_t *parse_goto(void)
5014 if(token.type != T_IDENTIFIER) {
5015 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5019 symbol_t *symbol = token.v.symbol;
5022 declaration_t *label = get_label(symbol);
5024 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5026 statement->statement.kind = STATEMENT_GOTO;
5027 statement->statement.source_position = token.source_position;
5029 statement->label = label;
5033 return (statement_t*) statement;
5037 * Parse a continue statement.
5039 static statement_t *parse_continue(void)
5044 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5045 statement->kind = STATEMENT_CONTINUE;
5046 statement->base.source_position = token.source_position;
5052 * Parse a break statement.
5054 static statement_t *parse_break(void)
5059 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5060 statement->kind = STATEMENT_BREAK;
5061 statement->base.source_position = token.source_position;
5067 * Check if a given declaration represents a local variable.
5069 static bool is_local_var_declaration(const declaration_t *declaration) {
5070 switch ((storage_class_tag_t) declaration->storage_class) {
5071 case STORAGE_CLASS_NONE:
5072 case STORAGE_CLASS_AUTO:
5073 case STORAGE_CLASS_REGISTER: {
5074 const type_t *type = skip_typeref(declaration->type);
5075 if(is_type_function(type)) {
5087 * Check if a given expression represents a local variable.
5089 static bool is_local_variable(const expression_t *expression)
5091 if (expression->base.kind != EXPR_REFERENCE) {
5094 const declaration_t *declaration = expression->reference.declaration;
5095 return is_local_var_declaration(declaration);
5099 * Parse a return statement.
5101 static statement_t *parse_return(void)
5105 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5107 statement->statement.kind = STATEMENT_RETURN;
5108 statement->statement.source_position = token.source_position;
5110 assert(is_type_function(current_function->type));
5111 function_type_t *function_type = ¤t_function->type->function;
5112 type_t *return_type = function_type->return_type;
5114 expression_t *return_value = NULL;
5115 if(token.type != ';') {
5116 return_value = parse_expression();
5120 if(return_type == NULL)
5121 return (statement_t*) statement;
5122 if(return_value != NULL && return_value->base.datatype == NULL)
5123 return (statement_t*) statement;
5125 return_type = skip_typeref(return_type);
5127 if(return_value != NULL) {
5128 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5130 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5131 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5132 warningf(statement->statement.source_position,
5133 "'return' with a value, in function returning void");
5134 return_value = NULL;
5136 if(return_type != NULL) {
5137 semantic_assign(return_type, &return_value, "'return'");
5140 /* check for returning address of a local var */
5141 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
5142 const expression_t *expression = return_value->unary.value;
5143 if (is_local_variable(expression)) {
5144 warningf(statement->statement.source_position,
5145 "function returns address of local variable");
5149 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5150 warningf(statement->statement.source_position,
5151 "'return' without value, in function returning non-void");
5154 statement->return_value = return_value;
5156 return (statement_t*) statement;
5160 * Parse a declaration statement.
5162 static statement_t *parse_declaration_statement(void)
5164 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5166 statement->base.source_position = token.source_position;
5168 declaration_t *before = last_declaration;
5169 parse_declaration(record_declaration);
5171 if(before == NULL) {
5172 statement->declaration.declarations_begin = context->declarations;
5174 statement->declaration.declarations_begin = before->next;
5176 statement->declaration.declarations_end = last_declaration;
5182 * Parse an expression statement, ie. expr ';'.
5184 static statement_t *parse_expression_statement(void)
5186 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5188 statement->base.source_position = token.source_position;
5189 statement->expression.expression = parse_expression();
5197 * Parse a statement.
5199 static statement_t *parse_statement(void)
5201 statement_t *statement = NULL;
5203 /* declaration or statement */
5204 switch(token.type) {
5206 statement = parse_asm_statement();
5210 statement = parse_case_statement();
5214 statement = parse_default_statement();
5218 statement = parse_compound_statement();
5222 statement = parse_if();
5226 statement = parse_switch();
5230 statement = parse_while();
5234 statement = parse_do();
5238 statement = parse_for();
5242 statement = parse_goto();
5246 statement = parse_continue();
5250 statement = parse_break();
5254 statement = parse_return();
5263 if(look_ahead(1)->type == ':') {
5264 statement = parse_label_statement();
5268 if(is_typedef_symbol(token.v.symbol)) {
5269 statement = parse_declaration_statement();
5273 statement = parse_expression_statement();
5276 case T___extension__:
5277 /* this can be a prefix to a declaration or an expression statement */
5278 /* we simply eat it now and parse the rest with tail recursion */
5281 } while(token.type == T___extension__);
5282 statement = parse_statement();
5286 statement = parse_declaration_statement();
5290 statement = parse_expression_statement();
5294 assert(statement == NULL
5295 || statement->base.source_position.input_name != NULL);
5301 * Parse a compound statement.
5303 static statement_t *parse_compound_statement(void)
5305 compound_statement_t *compound_statement
5306 = allocate_ast_zero(sizeof(compound_statement[0]));
5307 compound_statement->statement.kind = STATEMENT_COMPOUND;
5308 compound_statement->statement.source_position = token.source_position;
5312 int top = environment_top();
5313 context_t *last_context = context;
5314 set_context(&compound_statement->context);
5316 statement_t *last_statement = NULL;
5318 while(token.type != '}' && token.type != T_EOF) {
5319 statement_t *statement = parse_statement();
5320 if(statement == NULL)
5323 if(last_statement != NULL) {
5324 last_statement->base.next = statement;
5326 compound_statement->statements = statement;
5329 while(statement->base.next != NULL)
5330 statement = statement->base.next;
5332 last_statement = statement;
5335 if(token.type == '}') {
5338 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5341 assert(context == &compound_statement->context);
5342 set_context(last_context);
5343 environment_pop_to(top);
5345 return (statement_t*) compound_statement;
5349 * Initialize builtin types.
5351 static void initialize_builtin_types(void)
5353 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5354 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5355 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5356 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5357 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5358 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5359 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5360 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5362 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5363 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5364 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5365 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5369 * Parse a translation unit.
5371 static translation_unit_t *parse_translation_unit(void)
5373 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5375 assert(global_context == NULL);
5376 global_context = &unit->context;
5378 assert(context == NULL);
5379 set_context(&unit->context);
5381 initialize_builtin_types();
5383 while(token.type != T_EOF) {
5384 if (token.type == ';') {
5385 /* TODO error in strict mode */
5386 warningf(HERE, "stray ';' outside of function");
5389 parse_external_declaration();
5393 assert(context == &unit->context);
5395 last_declaration = NULL;
5397 assert(global_context == &unit->context);
5398 global_context = NULL;
5406 * @return the translation unit or NULL if errors occurred.
5408 translation_unit_t *parse(void)
5410 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5411 label_stack = NEW_ARR_F(stack_entry_t, 0);
5412 diagnostic_count = 0;
5416 type_set_output(stderr);
5417 ast_set_output(stderr);
5419 lookahead_bufpos = 0;
5420 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5423 translation_unit_t *unit = parse_translation_unit();
5425 DEL_ARR_F(environment_stack);
5426 DEL_ARR_F(label_stack);
5435 * Initialize the parser.
5437 void init_parser(void)
5439 init_expression_parsers();
5440 obstack_init(&temp_obst);
5442 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5443 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5447 * Terminate the parser.
5449 void exit_parser(void)
5451 obstack_free(&temp_obst, NULL);