7 #include "diagnostic.h"
8 #include "format_check.h"
14 #include "type_hash.h"
16 #include "lang_features.h"
18 #include "adt/bitfiddle.h"
19 #include "adt/error.h"
20 #include "adt/array.h"
22 //#define PRINT_TOKENS
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 scope_t *global_scope = NULL;
48 static scope_t *scope = NULL;
49 static declaration_t *last_declaration = NULL;
50 static declaration_t *current_function = NULL;
51 static switch_statement_t *current_switch = NULL;
52 static statement_t *current_loop = NULL;
53 static goto_statement_t *goto_first = NULL;
54 static goto_statement_t *goto_last = NULL;
55 static label_statement_t *label_first = NULL;
56 static label_statement_t *label_last = NULL;
57 static struct obstack temp_obst;
59 /** The current source position. */
60 #define HERE token.source_position
62 static type_t *type_valist;
64 static statement_t *parse_compound_statement(void);
65 static statement_t *parse_statement(void);
67 static expression_t *parse_sub_expression(unsigned precedence);
68 static expression_t *parse_expression(void);
69 static type_t *parse_typename(void);
71 static void parse_compound_type_entries(void);
72 static declaration_t *parse_declarator(
73 const declaration_specifiers_t *specifiers, bool may_be_abstract);
74 static declaration_t *record_declaration(declaration_t *declaration);
76 static void semantic_comparison(binary_expression_t *expression);
78 #define STORAGE_CLASSES \
85 #define TYPE_QUALIFIERS \
92 #ifdef PROVIDE_COMPLEX
93 #define COMPLEX_SPECIFIERS \
95 #define IMAGINARY_SPECIFIERS \
98 #define COMPLEX_SPECIFIERS
99 #define IMAGINARY_SPECIFIERS
102 #define TYPE_SPECIFIERS \
117 case T___builtin_va_list: \
121 #define DECLARATION_START \
126 #define TYPENAME_START \
131 * Allocate an AST node with given size and
132 * initialize all fields with zero.
134 static void *allocate_ast_zero(size_t size)
136 void *res = allocate_ast(size);
137 memset(res, 0, size);
141 static declaration_t *allocate_declaration_zero(void)
143 declaration_t *declaration = allocate_ast_zero(sizeof(*allocate_declaration_zero()));
144 declaration->type = type_error_type;
149 * Returns the size of a statement node.
151 * @param kind the statement kind
153 static size_t get_statement_struct_size(statement_kind_t kind)
155 static const size_t sizes[] = {
156 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
157 [STATEMENT_RETURN] = sizeof(return_statement_t),
158 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
159 [STATEMENT_IF] = sizeof(if_statement_t),
160 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
161 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
162 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
163 [STATEMENT_BREAK] = sizeof(statement_base_t),
164 [STATEMENT_GOTO] = sizeof(goto_statement_t),
165 [STATEMENT_LABEL] = sizeof(label_statement_t),
166 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
167 [STATEMENT_WHILE] = sizeof(while_statement_t),
168 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
169 [STATEMENT_FOR] = sizeof(for_statement_t),
170 [STATEMENT_ASM] = sizeof(asm_statement_t)
172 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
173 assert(sizes[kind] != 0);
178 * Allocate a statement node of given kind and initialize all
181 static statement_t *allocate_statement_zero(statement_kind_t kind)
183 size_t size = get_statement_struct_size(kind);
184 statement_t *res = allocate_ast_zero(size);
186 res->base.kind = kind;
191 * Returns the size of an expression node.
193 * @param kind the expression kind
195 static size_t get_expression_struct_size(expression_kind_t kind)
197 static const size_t sizes[] = {
198 [EXPR_INVALID] = sizeof(expression_base_t),
199 [EXPR_REFERENCE] = sizeof(reference_expression_t),
200 [EXPR_CONST] = sizeof(const_expression_t),
201 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
202 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
203 [EXPR_CALL] = sizeof(call_expression_t),
204 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
205 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
206 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
207 [EXPR_SELECT] = sizeof(select_expression_t),
208 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
209 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
210 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
211 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
212 [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
213 [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
214 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
215 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
216 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
217 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
218 [EXPR_VA_START] = sizeof(va_start_expression_t),
219 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
220 [EXPR_STATEMENT] = sizeof(statement_expression_t),
222 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
223 return sizes[EXPR_UNARY_FIRST];
225 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
226 return sizes[EXPR_BINARY_FIRST];
228 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
229 assert(sizes[kind] != 0);
234 * Allocate an expression node of given kind and initialize all
237 static expression_t *allocate_expression_zero(expression_kind_t kind)
239 size_t size = get_expression_struct_size(kind);
240 expression_t *res = allocate_ast_zero(size);
242 res->base.kind = kind;
243 res->base.datatype = type_error_type;
248 * Returns the size of a type node.
250 * @param kind the type kind
252 static size_t get_type_struct_size(type_kind_t kind)
254 static const size_t sizes[] = {
255 [TYPE_ATOMIC] = sizeof(atomic_type_t),
256 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
257 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
258 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
259 [TYPE_ENUM] = sizeof(enum_type_t),
260 [TYPE_FUNCTION] = sizeof(function_type_t),
261 [TYPE_POINTER] = sizeof(pointer_type_t),
262 [TYPE_ARRAY] = sizeof(array_type_t),
263 [TYPE_BUILTIN] = sizeof(builtin_type_t),
264 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
265 [TYPE_TYPEOF] = sizeof(typeof_type_t),
267 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
268 assert(kind <= TYPE_TYPEOF);
269 assert(sizes[kind] != 0);
274 * Allocate a type node of given kind and initialize all
277 static type_t *allocate_type_zero(type_kind_t kind)
279 size_t size = get_type_struct_size(kind);
280 type_t *res = obstack_alloc(type_obst, size);
281 memset(res, 0, size);
283 res->base.kind = kind;
288 * Returns the size of an initializer node.
290 * @param kind the initializer kind
292 static size_t get_initializer_size(initializer_kind_t kind)
294 static const size_t sizes[] = {
295 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
296 [INITIALIZER_STRING] = sizeof(initializer_string_t),
297 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
298 [INITIALIZER_LIST] = sizeof(initializer_list_t)
300 assert(kind < sizeof(sizes) / sizeof(*sizes));
301 assert(sizes[kind] != 0);
306 * Allocate an initializer node of given kind and initialize all
309 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
311 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
318 * Free a type from the type obstack.
320 static void free_type(void *type)
322 obstack_free(type_obst, type);
326 * Returns the index of the top element of the environment stack.
328 static size_t environment_top(void)
330 return ARR_LEN(environment_stack);
334 * Returns the index of the top element of the label stack.
336 static size_t label_top(void)
338 return ARR_LEN(label_stack);
343 * Return the next token.
345 static inline void next_token(void)
347 token = lookahead_buffer[lookahead_bufpos];
348 lookahead_buffer[lookahead_bufpos] = lexer_token;
351 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
354 print_token(stderr, &token);
355 fprintf(stderr, "\n");
360 * Return the next token with a given lookahead.
362 static inline const token_t *look_ahead(int num)
364 assert(num > 0 && num <= MAX_LOOKAHEAD);
365 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
366 return &lookahead_buffer[pos];
369 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
372 * Report a parse error because an expected token was not found.
374 static void parse_error_expected(const char *message, ...)
376 if(message != NULL) {
377 errorf(HERE, "%s", message);
380 va_start(ap, message);
381 errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
386 * Report a type error.
388 static void type_error(const char *msg, const source_position_t source_position,
391 errorf(source_position, "%s, but found type '%T'", msg, type);
395 * Report an incompatible type.
397 static void type_error_incompatible(const char *msg,
398 const source_position_t source_position, type_t *type1, type_t *type2)
400 errorf(source_position, "%s, incompatible types: '%T' - '%T'", msg, type1, type2);
404 * Eat an complete block, ie. '{ ... }'.
406 static void eat_block(void)
408 if(token.type == '{')
411 while(token.type != '}') {
412 if(token.type == T_EOF)
414 if(token.type == '{') {
424 * Eat a statement until an ';' token.
426 static void eat_statement(void)
428 while(token.type != ';') {
429 if(token.type == T_EOF)
431 if(token.type == '}')
433 if(token.type == '{') {
443 * Eat a parenthesed term, ie. '( ... )'.
445 static void eat_paren(void)
447 if(token.type == '(')
450 while(token.type != ')') {
451 if(token.type == T_EOF)
453 if(token.type == ')' || token.type == ';' || token.type == '}') {
456 if(token.type == '(') {
460 if(token.type == '{') {
469 #define expect(expected) \
470 if(UNLIKELY(token.type != (expected))) { \
471 parse_error_expected(NULL, (expected), 0); \
477 #define expect_block(expected) \
478 if(UNLIKELY(token.type != (expected))) { \
479 parse_error_expected(NULL, (expected), 0); \
485 #define expect_void(expected) \
486 if(UNLIKELY(token.type != (expected))) { \
487 parse_error_expected(NULL, (expected), 0); \
493 static void set_scope(scope_t *new_scope)
497 last_declaration = new_scope->declarations;
498 if(last_declaration != NULL) {
499 while(last_declaration->next != NULL) {
500 last_declaration = last_declaration->next;
506 * Search a symbol in a given namespace and returns its declaration or
507 * NULL if this symbol was not found.
509 static declaration_t *get_declaration(const symbol_t *const symbol, const namespace_t namespc)
511 declaration_t *declaration = symbol->declaration;
512 for( ; declaration != NULL; declaration = declaration->symbol_next) {
513 if(declaration->namespc == namespc)
521 * pushs an environment_entry on the environment stack and links the
522 * corresponding symbol to the new entry
524 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
526 symbol_t *symbol = declaration->symbol;
527 namespace_t namespc = (namespace_t)declaration->namespc;
529 /* remember old declaration */
531 entry.symbol = symbol;
532 entry.old_declaration = symbol->declaration;
533 entry.namespc = (unsigned short) namespc;
534 ARR_APP1(stack_entry_t, *stack_ptr, entry);
536 /* replace/add declaration into declaration list of the symbol */
537 if(symbol->declaration == NULL) {
538 symbol->declaration = declaration;
540 declaration_t *iter_last = NULL;
541 declaration_t *iter = symbol->declaration;
542 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
543 /* replace an entry? */
544 if(iter->namespc == namespc) {
545 if(iter_last == NULL) {
546 symbol->declaration = declaration;
548 iter_last->symbol_next = declaration;
550 declaration->symbol_next = iter->symbol_next;
555 assert(iter_last->symbol_next == NULL);
556 iter_last->symbol_next = declaration;
561 static void environment_push(declaration_t *declaration)
563 assert(declaration->source_position.input_name != NULL);
564 assert(declaration->parent_scope != NULL);
565 stack_push(&environment_stack, declaration);
568 static void label_push(declaration_t *declaration)
570 declaration->parent_scope = ¤t_function->scope;
571 stack_push(&label_stack, declaration);
575 * pops symbols from the environment stack until @p new_top is the top element
577 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
579 stack_entry_t *stack = *stack_ptr;
580 size_t top = ARR_LEN(stack);
583 assert(new_top <= top);
587 for(i = top; i > new_top; --i) {
588 stack_entry_t *entry = &stack[i - 1];
590 declaration_t *old_declaration = entry->old_declaration;
591 symbol_t *symbol = entry->symbol;
592 namespace_t namespc = (namespace_t)entry->namespc;
594 /* replace/remove declaration */
595 declaration_t *declaration = symbol->declaration;
596 assert(declaration != NULL);
597 if(declaration->namespc == namespc) {
598 if(old_declaration == NULL) {
599 symbol->declaration = declaration->symbol_next;
601 symbol->declaration = old_declaration;
604 declaration_t *iter_last = declaration;
605 declaration_t *iter = declaration->symbol_next;
606 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
607 /* replace an entry? */
608 if(iter->namespc == namespc) {
609 assert(iter_last != NULL);
610 iter_last->symbol_next = old_declaration;
611 old_declaration->symbol_next = iter->symbol_next;
615 assert(iter != NULL);
619 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
622 static void environment_pop_to(size_t new_top)
624 stack_pop_to(&environment_stack, new_top);
627 static void label_pop_to(size_t new_top)
629 stack_pop_to(&label_stack, new_top);
633 static int get_rank(const type_t *type)
635 assert(!is_typeref(type));
636 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
637 * and esp. footnote 108). However we can't fold constants (yet), so we
638 * can't decide whether unsigned int is possible, while int always works.
639 * (unsigned int would be preferable when possible... for stuff like
640 * struct { enum { ... } bla : 4; } ) */
641 if(type->kind == TYPE_ENUM)
642 return ATOMIC_TYPE_INT;
644 assert(type->kind == TYPE_ATOMIC);
645 return type->atomic.akind;
648 static type_t *promote_integer(type_t *type)
650 if(type->kind == TYPE_BITFIELD)
651 type = type->bitfield.base;
653 if(get_rank(type) < ATOMIC_TYPE_INT)
660 * Create a cast expression.
662 * @param expression the expression to cast
663 * @param dest_type the destination type
665 static expression_t *create_cast_expression(expression_t *expression,
668 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
670 cast->unary.value = expression;
671 cast->base.datatype = dest_type;
677 * Check if a given expression represents the 0 pointer constant.
679 static bool is_null_pointer_constant(const expression_t *expression)
681 /* skip void* cast */
682 if(expression->kind == EXPR_UNARY_CAST
683 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
684 expression = expression->unary.value;
687 /* TODO: not correct yet, should be any constant integer expression
688 * which evaluates to 0 */
689 if (expression->kind != EXPR_CONST)
692 type_t *const type = skip_typeref(expression->base.datatype);
693 if (!is_type_integer(type))
696 return expression->conste.v.int_value == 0;
700 * Create an implicit cast expression.
702 * @param expression the expression to cast
703 * @param dest_type the destination type
705 static expression_t *create_implicit_cast(expression_t *expression,
708 type_t *const source_type = expression->base.datatype;
710 if (source_type == dest_type)
713 return create_cast_expression(expression, dest_type);
716 /** Implements the rules from § 6.5.16.1 */
717 static type_t *semantic_assign(type_t *orig_type_left,
718 const expression_t *const right,
721 type_t *const orig_type_right = right->base.datatype;
722 type_t *const type_left = skip_typeref(orig_type_left);
723 type_t *const type_right = skip_typeref(orig_type_right);
725 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
726 (is_type_pointer(type_left) && is_null_pointer_constant(right)) ||
727 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
728 && is_type_pointer(type_right))) {
729 return orig_type_left;
732 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
733 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
734 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
736 /* the left type has all qualifiers from the right type */
737 unsigned missing_qualifiers
738 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
739 if(missing_qualifiers != 0) {
740 errorf(HERE, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
741 return orig_type_left;
744 points_to_left = get_unqualified_type(points_to_left);
745 points_to_right = get_unqualified_type(points_to_right);
747 if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
748 && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
749 && !types_compatible(points_to_left, points_to_right)) {
753 return orig_type_left;
756 if (is_type_compound(type_left) && is_type_compound(type_right)) {
757 type_t *const unqual_type_left = get_unqualified_type(type_left);
758 type_t *const unqual_type_right = get_unqualified_type(type_right);
759 if (types_compatible(unqual_type_left, unqual_type_right)) {
760 return orig_type_left;
764 if (!is_type_valid(type_left))
767 if (!is_type_valid(type_right))
768 return orig_type_right;
773 static expression_t *parse_constant_expression(void)
775 /* start parsing at precedence 7 (conditional expression) */
776 expression_t *result = parse_sub_expression(7);
778 if(!is_constant_expression(result)) {
779 errorf(result->base.source_position, "expression '%E' is not constant\n", result);
785 static expression_t *parse_assignment_expression(void)
787 /* start parsing at precedence 2 (assignment expression) */
788 return parse_sub_expression(2);
791 static type_t *make_global_typedef(const char *name, type_t *type)
793 symbol_t *const symbol = symbol_table_insert(name);
795 declaration_t *const declaration = allocate_declaration_zero();
796 declaration->namespc = NAMESPACE_NORMAL;
797 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
798 declaration->type = type;
799 declaration->symbol = symbol;
800 declaration->source_position = builtin_source_position;
802 record_declaration(declaration);
804 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF);
805 typedef_type->typedeft.declaration = declaration;
810 static string_t parse_string_literals(void)
812 assert(token.type == T_STRING_LITERAL);
813 string_t result = token.v.string;
817 while (token.type == T_STRING_LITERAL) {
818 result = concat_strings(&result, &token.v.string);
825 static void parse_attributes(void)
829 case T___attribute__: {
837 errorf(HERE, "EOF while parsing attribute");
856 if(token.type != T_STRING_LITERAL) {
857 parse_error_expected("while parsing assembler attribute",
862 parse_string_literals();
867 goto attributes_finished;
876 static designator_t *parse_designation(void)
878 if(token.type != '[' && token.type != '.')
881 designator_t *result = NULL;
882 designator_t *last = NULL;
885 designator_t *designator;
888 designator = allocate_ast_zero(sizeof(designator[0]));
890 designator->array_access = parse_constant_expression();
894 designator = allocate_ast_zero(sizeof(designator[0]));
896 if(token.type != T_IDENTIFIER) {
897 parse_error_expected("while parsing designator",
901 designator->symbol = token.v.symbol;
909 assert(designator != NULL);
911 last->next = designator;
920 static initializer_t *initializer_from_string(array_type_t *type,
921 const string_t *const string)
923 /* TODO: check len vs. size of array type */
926 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
927 initializer->string.string = *string;
932 static initializer_t *initializer_from_wide_string(array_type_t *const type,
933 wide_string_t *const string)
935 /* TODO: check len vs. size of array type */
938 initializer_t *const initializer =
939 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
940 initializer->wide_string.string = *string;
945 static initializer_t *initializer_from_expression(type_t *type,
946 expression_t *expression)
948 /* TODO check that expression is a constant expression */
950 /* § 6.7.8.14/15 char array may be initialized by string literals */
951 type_t *const expr_type = expression->base.datatype;
952 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
953 array_type_t *const array_type = &type->array;
954 type_t *const element_type = skip_typeref(array_type->element_type);
956 if (element_type->kind == TYPE_ATOMIC) {
957 switch (expression->kind) {
958 case EXPR_STRING_LITERAL:
959 if (element_type->atomic.akind == ATOMIC_TYPE_CHAR) {
960 return initializer_from_string(array_type,
961 &expression->string.value);
964 case EXPR_WIDE_STRING_LITERAL: {
965 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
966 if (get_unqualified_type(element_type) == bare_wchar_type) {
967 return initializer_from_wide_string(array_type,
968 &expression->wide_string.value);
978 type_t *const res_type = semantic_assign(type, expression, "initializer");
979 if (res_type == NULL)
982 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
983 result->value.value = create_implicit_cast(expression, res_type);
988 static initializer_t *parse_sub_initializer(type_t *type,
989 expression_t *expression);
991 static initializer_t *parse_sub_initializer_elem(type_t *type)
993 if(token.type == '{') {
994 return parse_sub_initializer(type, NULL);
997 expression_t *expression = parse_assignment_expression();
998 return parse_sub_initializer(type, expression);
1001 static bool had_initializer_brace_warning;
1003 static void skip_designator(void)
1006 if(token.type == '.') {
1008 if(token.type == T_IDENTIFIER)
1010 } else if(token.type == '[') {
1012 parse_constant_expression();
1013 if(token.type == ']')
1021 static initializer_t *parse_sub_initializer(type_t *type,
1022 expression_t *expression)
1024 if(is_type_scalar(type)) {
1025 /* there might be extra {} hierarchies */
1026 if(token.type == '{') {
1028 if(!had_initializer_brace_warning) {
1029 warningf(HERE, "braces around scalar initializer");
1030 had_initializer_brace_warning = true;
1032 initializer_t *result = parse_sub_initializer(type, NULL);
1033 if(token.type == ',') {
1035 /* TODO: warn about excessive elements */
1041 if(expression == NULL) {
1042 expression = parse_assignment_expression();
1044 return initializer_from_expression(type, expression);
1047 /* does the expression match the currently looked at object to initialize */
1048 if(expression != NULL) {
1049 initializer_t *result = initializer_from_expression(type, expression);
1054 bool read_paren = false;
1055 if(token.type == '{') {
1060 /* descend into subtype */
1061 initializer_t *result = NULL;
1062 initializer_t **elems;
1063 if(is_type_array(type)) {
1064 if(token.type == '.') {
1066 "compound designator in initializer for array type '%T'",
1071 type_t *const element_type = skip_typeref(type->array.element_type);
1074 had_initializer_brace_warning = false;
1075 if(expression == NULL) {
1076 sub = parse_sub_initializer_elem(element_type);
1078 sub = parse_sub_initializer(element_type, expression);
1081 /* didn't match the subtypes -> try the parent type */
1083 assert(!read_paren);
1087 elems = NEW_ARR_F(initializer_t*, 0);
1088 ARR_APP1(initializer_t*, elems, sub);
1091 if(token.type == '}')
1094 if(token.type == '}')
1097 sub = parse_sub_initializer_elem(element_type);
1099 /* TODO error, do nicer cleanup */
1100 errorf(HERE, "member initializer didn't match");
1104 ARR_APP1(initializer_t*, elems, sub);
1107 assert(is_type_compound(type));
1108 scope_t *const scope = &type->compound.declaration->scope;
1110 if(token.type == '[') {
1112 "array designator in initializer for compound type '%T'",
1117 declaration_t *first = scope->declarations;
1120 type_t *first_type = first->type;
1121 first_type = skip_typeref(first_type);
1124 had_initializer_brace_warning = false;
1125 if(expression == NULL) {
1126 sub = parse_sub_initializer_elem(first_type);
1128 sub = parse_sub_initializer(first_type, expression);
1131 /* didn't match the subtypes -> try our parent type */
1133 assert(!read_paren);
1137 elems = NEW_ARR_F(initializer_t*, 0);
1138 ARR_APP1(initializer_t*, elems, sub);
1140 declaration_t *iter = first->next;
1141 for( ; iter != NULL; iter = iter->next) {
1142 if(iter->symbol == NULL)
1144 if(iter->namespc != NAMESPACE_NORMAL)
1147 if(token.type == '}')
1150 if(token.type == '}')
1153 type_t *iter_type = iter->type;
1154 iter_type = skip_typeref(iter_type);
1156 sub = parse_sub_initializer_elem(iter_type);
1158 /* TODO error, do nicer cleanup */
1159 errorf(HERE, "member initializer didn't match");
1163 ARR_APP1(initializer_t*, elems, sub);
1167 int len = ARR_LEN(elems);
1168 size_t elems_size = sizeof(initializer_t*) * len;
1170 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1172 init->initializer.kind = INITIALIZER_LIST;
1174 memcpy(init->initializers, elems, elems_size);
1177 result = (initializer_t*) init;
1180 if(token.type == ',')
1187 static initializer_t *parse_initializer(type_t *const orig_type)
1189 initializer_t *result;
1191 type_t *const type = skip_typeref(orig_type);
1193 if(token.type != '{') {
1194 expression_t *expression = parse_assignment_expression();
1195 initializer_t *initializer = initializer_from_expression(type, expression);
1196 if(initializer == NULL) {
1198 "initializer expression '%E' of type '%T' is incompatible with type '%T'",
1199 expression, expression->base.datatype, orig_type);
1204 if(is_type_scalar(type)) {
1208 expression_t *expression = parse_assignment_expression();
1209 result = initializer_from_expression(type, expression);
1211 if(token.type == ',')
1217 result = parse_sub_initializer(type, NULL);
1223 static declaration_t *append_declaration(declaration_t *declaration);
1225 static declaration_t *parse_compound_type_specifier(bool is_struct)
1233 symbol_t *symbol = NULL;
1234 declaration_t *declaration = NULL;
1236 if (token.type == T___attribute__) {
1241 if(token.type == T_IDENTIFIER) {
1242 symbol = token.v.symbol;
1246 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1248 declaration = get_declaration(symbol, NAMESPACE_UNION);
1250 } else if(token.type != '{') {
1252 parse_error_expected("while parsing struct type specifier",
1253 T_IDENTIFIER, '{', 0);
1255 parse_error_expected("while parsing union type specifier",
1256 T_IDENTIFIER, '{', 0);
1262 if(declaration == NULL) {
1263 declaration = allocate_declaration_zero();
1264 declaration->namespc =
1265 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
1266 declaration->source_position = token.source_position;
1267 declaration->symbol = symbol;
1268 declaration->parent_scope = scope;
1269 if (symbol != NULL) {
1270 environment_push(declaration);
1272 append_declaration(declaration);
1275 if(token.type == '{') {
1276 if(declaration->init.is_defined) {
1277 assert(symbol != NULL);
1278 errorf(HERE, "multiple definition of '%s %Y'",
1279 is_struct ? "struct" : "union", symbol);
1280 declaration->scope.declarations = NULL;
1282 declaration->init.is_defined = true;
1284 int top = environment_top();
1285 scope_t *last_scope = scope;
1286 set_scope(&declaration->scope);
1288 parse_compound_type_entries();
1291 assert(scope == &declaration->scope);
1292 set_scope(last_scope);
1293 environment_pop_to(top);
1299 static void parse_enum_entries(type_t *const enum_type)
1303 if(token.type == '}') {
1305 errorf(HERE, "empty enum not allowed");
1310 if(token.type != T_IDENTIFIER) {
1311 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1316 declaration_t *const entry = allocate_declaration_zero();
1317 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1318 entry->type = enum_type;
1319 entry->symbol = token.v.symbol;
1320 entry->source_position = token.source_position;
1323 if(token.type == '=') {
1325 entry->init.enum_value = parse_constant_expression();
1330 record_declaration(entry);
1332 if(token.type != ',')
1335 } while(token.type != '}');
1340 static type_t *parse_enum_specifier(void)
1344 declaration_t *declaration;
1347 if(token.type == T_IDENTIFIER) {
1348 symbol = token.v.symbol;
1351 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1352 } else if(token.type != '{') {
1353 parse_error_expected("while parsing enum type specifier",
1354 T_IDENTIFIER, '{', 0);
1361 if(declaration == NULL) {
1362 declaration = allocate_declaration_zero();
1363 declaration->namespc = NAMESPACE_ENUM;
1364 declaration->source_position = token.source_position;
1365 declaration->symbol = symbol;
1366 declaration->parent_scope = scope;
1369 type_t *const type = allocate_type_zero(TYPE_ENUM);
1370 type->enumt.declaration = declaration;
1372 if(token.type == '{') {
1373 if(declaration->init.is_defined) {
1374 errorf(HERE, "multiple definitions of enum %Y", symbol);
1376 if (symbol != NULL) {
1377 environment_push(declaration);
1379 append_declaration(declaration);
1380 declaration->init.is_defined = 1;
1382 parse_enum_entries(type);
1390 * if a symbol is a typedef to another type, return true
1392 static bool is_typedef_symbol(symbol_t *symbol)
1394 const declaration_t *const declaration =
1395 get_declaration(symbol, NAMESPACE_NORMAL);
1397 declaration != NULL &&
1398 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1401 static type_t *parse_typeof(void)
1409 expression_t *expression = NULL;
1412 switch(token.type) {
1413 case T___extension__:
1414 /* this can be a prefix to a typename or an expression */
1415 /* we simply eat it now. */
1418 } while(token.type == T___extension__);
1422 if(is_typedef_symbol(token.v.symbol)) {
1423 type = parse_typename();
1425 expression = parse_expression();
1426 type = expression->base.datatype;
1431 type = parse_typename();
1435 expression = parse_expression();
1436 type = expression->base.datatype;
1442 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1443 typeof_type->typeoft.expression = expression;
1444 typeof_type->typeoft.typeof_type = type;
1450 SPECIFIER_SIGNED = 1 << 0,
1451 SPECIFIER_UNSIGNED = 1 << 1,
1452 SPECIFIER_LONG = 1 << 2,
1453 SPECIFIER_INT = 1 << 3,
1454 SPECIFIER_DOUBLE = 1 << 4,
1455 SPECIFIER_CHAR = 1 << 5,
1456 SPECIFIER_SHORT = 1 << 6,
1457 SPECIFIER_LONG_LONG = 1 << 7,
1458 SPECIFIER_FLOAT = 1 << 8,
1459 SPECIFIER_BOOL = 1 << 9,
1460 SPECIFIER_VOID = 1 << 10,
1461 #ifdef PROVIDE_COMPLEX
1462 SPECIFIER_COMPLEX = 1 << 11,
1463 SPECIFIER_IMAGINARY = 1 << 12,
1467 static type_t *create_builtin_type(symbol_t *const symbol,
1468 type_t *const real_type)
1470 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1471 type->builtin.symbol = symbol;
1472 type->builtin.real_type = real_type;
1474 type_t *result = typehash_insert(type);
1475 if (type != result) {
1482 static type_t *get_typedef_type(symbol_t *symbol)
1484 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1485 if(declaration == NULL
1486 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1489 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1490 type->typedeft.declaration = declaration;
1495 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1497 type_t *type = NULL;
1498 unsigned type_qualifiers = 0;
1499 unsigned type_specifiers = 0;
1502 specifiers->source_position = token.source_position;
1505 switch(token.type) {
1508 #define MATCH_STORAGE_CLASS(token, class) \
1510 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1511 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1513 specifiers->storage_class = class; \
1517 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1518 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1519 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1520 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1521 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1524 switch (specifiers->storage_class) {
1525 case STORAGE_CLASS_NONE:
1526 specifiers->storage_class = STORAGE_CLASS_THREAD;
1529 case STORAGE_CLASS_EXTERN:
1530 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1533 case STORAGE_CLASS_STATIC:
1534 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1538 errorf(HERE, "multiple storage classes in declaration specifiers");
1544 /* type qualifiers */
1545 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1547 type_qualifiers |= qualifier; \
1551 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1552 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1553 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1555 case T___extension__:
1560 /* type specifiers */
1561 #define MATCH_SPECIFIER(token, specifier, name) \
1564 if(type_specifiers & specifier) { \
1565 errorf(HERE, "multiple " name " type specifiers given"); \
1567 type_specifiers |= specifier; \
1571 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1572 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1573 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1574 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1575 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1576 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1577 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1578 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1579 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1580 #ifdef PROVIDE_COMPLEX
1581 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1582 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1585 /* only in microsoft mode */
1586 specifiers->decl_modifiers |= DM_FORCEINLINE;
1590 specifiers->is_inline = true;
1595 if(type_specifiers & SPECIFIER_LONG_LONG) {
1596 errorf(HERE, "multiple type specifiers given");
1597 } else if(type_specifiers & SPECIFIER_LONG) {
1598 type_specifiers |= SPECIFIER_LONG_LONG;
1600 type_specifiers |= SPECIFIER_LONG;
1604 /* TODO: if is_type_valid(type) for the following rules should issue
1607 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1609 type->compound.declaration = parse_compound_type_specifier(true);
1613 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1615 type->compound.declaration = parse_compound_type_specifier(false);
1619 type = parse_enum_specifier();
1622 type = parse_typeof();
1624 case T___builtin_va_list:
1625 type = duplicate_type(type_valist);
1629 case T___attribute__:
1634 case T_IDENTIFIER: {
1635 type_t *typedef_type = get_typedef_type(token.v.symbol);
1637 if(typedef_type == NULL)
1638 goto finish_specifiers;
1641 type = typedef_type;
1645 /* function specifier */
1647 goto finish_specifiers;
1654 atomic_type_kind_t atomic_type;
1656 /* match valid basic types */
1657 switch(type_specifiers) {
1658 case SPECIFIER_VOID:
1659 atomic_type = ATOMIC_TYPE_VOID;
1661 case SPECIFIER_CHAR:
1662 atomic_type = ATOMIC_TYPE_CHAR;
1664 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1665 atomic_type = ATOMIC_TYPE_SCHAR;
1667 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1668 atomic_type = ATOMIC_TYPE_UCHAR;
1670 case SPECIFIER_SHORT:
1671 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1672 case SPECIFIER_SHORT | SPECIFIER_INT:
1673 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1674 atomic_type = ATOMIC_TYPE_SHORT;
1676 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1677 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1678 atomic_type = ATOMIC_TYPE_USHORT;
1681 case SPECIFIER_SIGNED:
1682 case SPECIFIER_SIGNED | SPECIFIER_INT:
1683 atomic_type = ATOMIC_TYPE_INT;
1685 case SPECIFIER_UNSIGNED:
1686 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1687 atomic_type = ATOMIC_TYPE_UINT;
1689 case SPECIFIER_LONG:
1690 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1691 case SPECIFIER_LONG | SPECIFIER_INT:
1692 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1693 atomic_type = ATOMIC_TYPE_LONG;
1695 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1696 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1697 atomic_type = ATOMIC_TYPE_ULONG;
1699 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1700 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1701 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1702 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1704 atomic_type = ATOMIC_TYPE_LONGLONG;
1706 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1707 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1709 atomic_type = ATOMIC_TYPE_ULONGLONG;
1711 case SPECIFIER_FLOAT:
1712 atomic_type = ATOMIC_TYPE_FLOAT;
1714 case SPECIFIER_DOUBLE:
1715 atomic_type = ATOMIC_TYPE_DOUBLE;
1717 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1718 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1720 case SPECIFIER_BOOL:
1721 atomic_type = ATOMIC_TYPE_BOOL;
1723 #ifdef PROVIDE_COMPLEX
1724 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1725 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1727 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1728 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1730 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1731 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1733 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1734 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1736 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1737 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1739 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1740 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1744 /* invalid specifier combination, give an error message */
1745 if(type_specifiers == 0) {
1746 if (! strict_mode) {
1747 if (warning.implicit_int) {
1748 warningf(HERE, "no type specifiers in declaration, using 'int'");
1750 atomic_type = ATOMIC_TYPE_INT;
1753 errorf(HERE, "no type specifiers given in declaration");
1755 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1756 (type_specifiers & SPECIFIER_UNSIGNED)) {
1757 errorf(HERE, "signed and unsigned specifiers gives");
1758 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1759 errorf(HERE, "only integer types can be signed or unsigned");
1761 errorf(HERE, "multiple datatypes in declaration");
1763 atomic_type = ATOMIC_TYPE_INVALID;
1766 type = allocate_type_zero(TYPE_ATOMIC);
1767 type->atomic.akind = atomic_type;
1770 if(type_specifiers != 0) {
1771 errorf(HERE, "multiple datatypes in declaration");
1775 type->base.qualifiers = type_qualifiers;
1777 type_t *result = typehash_insert(type);
1778 if(newtype && result != type) {
1782 specifiers->type = result;
1785 static type_qualifiers_t parse_type_qualifiers(void)
1787 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1790 switch(token.type) {
1791 /* type qualifiers */
1792 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1793 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1794 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1797 return type_qualifiers;
1802 static declaration_t *parse_identifier_list(void)
1804 declaration_t *declarations = NULL;
1805 declaration_t *last_declaration = NULL;
1807 declaration_t *const declaration = allocate_declaration_zero();
1808 declaration->source_position = token.source_position;
1809 declaration->symbol = token.v.symbol;
1812 if(last_declaration != NULL) {
1813 last_declaration->next = declaration;
1815 declarations = declaration;
1817 last_declaration = declaration;
1819 if(token.type != ',')
1822 } while(token.type == T_IDENTIFIER);
1824 return declarations;
1827 static void semantic_parameter(declaration_t *declaration)
1829 /* TODO: improve error messages */
1831 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1832 errorf(HERE, "typedef not allowed in parameter list");
1833 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1834 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1835 errorf(HERE, "parameter may only have none or register storage class");
1838 type_t *const orig_type = declaration->type;
1839 type_t * type = skip_typeref(orig_type);
1841 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1842 * into a pointer. § 6.7.5.3 (7) */
1843 if (is_type_array(type)) {
1844 type_t *const element_type = type->array.element_type;
1846 type = make_pointer_type(element_type, type->base.qualifiers);
1848 declaration->type = type;
1851 if(is_type_incomplete(type)) {
1852 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1853 orig_type, declaration->symbol);
1857 static declaration_t *parse_parameter(void)
1859 declaration_specifiers_t specifiers;
1860 memset(&specifiers, 0, sizeof(specifiers));
1862 parse_declaration_specifiers(&specifiers);
1864 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1866 semantic_parameter(declaration);
1871 static declaration_t *parse_parameters(function_type_t *type)
1873 if(token.type == T_IDENTIFIER) {
1874 symbol_t *symbol = token.v.symbol;
1875 if(!is_typedef_symbol(symbol)) {
1876 type->kr_style_parameters = true;
1877 return parse_identifier_list();
1881 if(token.type == ')') {
1882 type->unspecified_parameters = 1;
1885 if(token.type == T_void && look_ahead(1)->type == ')') {
1890 declaration_t *declarations = NULL;
1891 declaration_t *declaration;
1892 declaration_t *last_declaration = NULL;
1893 function_parameter_t *parameter;
1894 function_parameter_t *last_parameter = NULL;
1897 switch(token.type) {
1901 return declarations;
1904 case T___extension__:
1906 declaration = parse_parameter();
1908 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1909 memset(parameter, 0, sizeof(parameter[0]));
1910 parameter->type = declaration->type;
1912 if(last_parameter != NULL) {
1913 last_declaration->next = declaration;
1914 last_parameter->next = parameter;
1916 type->parameters = parameter;
1917 declarations = declaration;
1919 last_parameter = parameter;
1920 last_declaration = declaration;
1924 return declarations;
1926 if(token.type != ',')
1927 return declarations;
1937 } construct_type_type_t;
1939 typedef struct construct_type_t construct_type_t;
1940 struct construct_type_t {
1941 construct_type_type_t type;
1942 construct_type_t *next;
1945 typedef struct parsed_pointer_t parsed_pointer_t;
1946 struct parsed_pointer_t {
1947 construct_type_t construct_type;
1948 type_qualifiers_t type_qualifiers;
1951 typedef struct construct_function_type_t construct_function_type_t;
1952 struct construct_function_type_t {
1953 construct_type_t construct_type;
1954 type_t *function_type;
1957 typedef struct parsed_array_t parsed_array_t;
1958 struct parsed_array_t {
1959 construct_type_t construct_type;
1960 type_qualifiers_t type_qualifiers;
1966 typedef struct construct_base_type_t construct_base_type_t;
1967 struct construct_base_type_t {
1968 construct_type_t construct_type;
1972 static construct_type_t *parse_pointer_declarator(void)
1976 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
1977 memset(pointer, 0, sizeof(pointer[0]));
1978 pointer->construct_type.type = CONSTRUCT_POINTER;
1979 pointer->type_qualifiers = parse_type_qualifiers();
1981 return (construct_type_t*) pointer;
1984 static construct_type_t *parse_array_declarator(void)
1988 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
1989 memset(array, 0, sizeof(array[0]));
1990 array->construct_type.type = CONSTRUCT_ARRAY;
1992 if(token.type == T_static) {
1993 array->is_static = true;
1997 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
1998 if(type_qualifiers != 0) {
1999 if(token.type == T_static) {
2000 array->is_static = true;
2004 array->type_qualifiers = type_qualifiers;
2006 if(token.type == '*' && look_ahead(1)->type == ']') {
2007 array->is_variable = true;
2009 } else if(token.type != ']') {
2010 array->size = parse_assignment_expression();
2015 return (construct_type_t*) array;
2018 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2022 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2024 declaration_t *parameters = parse_parameters(&type->function);
2025 if(declaration != NULL) {
2026 declaration->scope.declarations = parameters;
2029 construct_function_type_t *construct_function_type =
2030 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2031 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2032 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2033 construct_function_type->function_type = type;
2037 return (construct_type_t*) construct_function_type;
2040 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2041 bool may_be_abstract)
2043 /* construct a single linked list of construct_type_t's which describe
2044 * how to construct the final declarator type */
2045 construct_type_t *first = NULL;
2046 construct_type_t *last = NULL;
2049 while(token.type == '*') {
2050 construct_type_t *type = parse_pointer_declarator();
2061 /* TODO: find out if this is correct */
2064 construct_type_t *inner_types = NULL;
2066 switch(token.type) {
2068 if(declaration == NULL) {
2069 errorf(HERE, "no identifier expected in typename");
2071 declaration->symbol = token.v.symbol;
2072 declaration->source_position = token.source_position;
2078 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2084 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2085 /* avoid a loop in the outermost scope, because eat_statement doesn't
2087 if(token.type == '}' && current_function == NULL) {
2095 construct_type_t *p = last;
2098 construct_type_t *type;
2099 switch(token.type) {
2101 type = parse_function_declarator(declaration);
2104 type = parse_array_declarator();
2107 goto declarator_finished;
2110 /* insert in the middle of the list (behind p) */
2112 type->next = p->next;
2123 declarator_finished:
2126 /* append inner_types at the end of the list, we don't to set last anymore
2127 * as it's not needed anymore */
2129 assert(first == NULL);
2130 first = inner_types;
2132 last->next = inner_types;
2138 static type_t *construct_declarator_type(construct_type_t *construct_list,
2141 construct_type_t *iter = construct_list;
2142 for( ; iter != NULL; iter = iter->next) {
2143 switch(iter->type) {
2144 case CONSTRUCT_INVALID:
2145 panic("invalid type construction found");
2146 case CONSTRUCT_FUNCTION: {
2147 construct_function_type_t *construct_function_type
2148 = (construct_function_type_t*) iter;
2150 type_t *function_type = construct_function_type->function_type;
2152 function_type->function.return_type = type;
2154 type_t *skipped_return_type = skip_typeref(type);
2155 if (is_type_function(skipped_return_type)) {
2156 errorf(HERE, "function returning function is not allowed");
2157 type = type_error_type;
2158 } else if (is_type_array(skipped_return_type)) {
2159 errorf(HERE, "function returning array is not allowed");
2160 type = type_error_type;
2162 type = function_type;
2167 case CONSTRUCT_POINTER: {
2168 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2169 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2170 pointer_type->pointer.points_to = type;
2171 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2173 type = pointer_type;
2177 case CONSTRUCT_ARRAY: {
2178 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2179 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2181 array_type->base.qualifiers = parsed_array->type_qualifiers;
2182 array_type->array.element_type = type;
2183 array_type->array.is_static = parsed_array->is_static;
2184 array_type->array.is_variable = parsed_array->is_variable;
2185 array_type->array.size = parsed_array->size;
2187 type_t *skipped_type = skip_typeref(type);
2188 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
2189 errorf(HERE, "array of void is not allowed");
2190 type = type_error_type;
2198 type_t *hashed_type = typehash_insert(type);
2199 if(hashed_type != type) {
2200 /* the function type was constructed earlier freeing it here will
2201 * destroy other types... */
2202 if(iter->type != CONSTRUCT_FUNCTION) {
2212 static declaration_t *parse_declarator(
2213 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2215 declaration_t *const declaration = allocate_declaration_zero();
2216 declaration->storage_class = specifiers->storage_class;
2217 declaration->modifiers = specifiers->decl_modifiers;
2218 declaration->is_inline = specifiers->is_inline;
2220 construct_type_t *construct_type
2221 = parse_inner_declarator(declaration, may_be_abstract);
2222 type_t *const type = specifiers->type;
2223 declaration->type = construct_declarator_type(construct_type, type);
2225 if(construct_type != NULL) {
2226 obstack_free(&temp_obst, construct_type);
2232 static type_t *parse_abstract_declarator(type_t *base_type)
2234 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2236 type_t *result = construct_declarator_type(construct_type, base_type);
2237 if(construct_type != NULL) {
2238 obstack_free(&temp_obst, construct_type);
2244 static declaration_t *append_declaration(declaration_t* const declaration)
2246 if (last_declaration != NULL) {
2247 last_declaration->next = declaration;
2249 scope->declarations = declaration;
2251 last_declaration = declaration;
2256 * Check if the declaration of main is suspicious. main should be a
2257 * function with external linkage, returning int, taking either zero
2258 * arguments, two, or three arguments of appropriate types, ie.
2260 * int main([ int argc, char **argv [, char **env ] ]).
2262 * @param decl the declaration to check
2263 * @param type the function type of the declaration
2265 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
2267 if (decl->storage_class == STORAGE_CLASS_STATIC) {
2268 warningf(decl->source_position, "'main' is normally a non-static function");
2270 if (skip_typeref(func_type->return_type) != type_int) {
2271 warningf(decl->source_position, "return type of 'main' should be 'int', but is '%T'", func_type->return_type);
2273 const function_parameter_t *parm = func_type->parameters;
2275 type_t *const first_type = parm->type;
2276 if (!types_compatible(skip_typeref(first_type), type_int)) {
2277 warningf(decl->source_position, "first argument of 'main' should be 'int', but is '%T'", first_type);
2281 type_t *const second_type = parm->type;
2282 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
2283 warningf(decl->source_position, "second argument of 'main' should be 'char**', but is '%T'", second_type);
2287 type_t *const third_type = parm->type;
2288 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
2289 warningf(decl->source_position, "third argument of 'main' should be 'char**', but is '%T'", third_type);
2293 warningf(decl->source_position, "'main' takes only zero, two or three arguments");
2297 warningf(decl->source_position, "'main' takes only zero, two or three arguments");
2303 * Check if a symbol is the equal to "main".
2305 static bool is_sym_main(const symbol_t *const sym)
2307 return strcmp(sym->string, "main") == 0;
2310 static declaration_t *internal_record_declaration(
2311 declaration_t *const declaration,
2312 const bool is_function_definition)
2314 const symbol_t *const symbol = declaration->symbol;
2315 const namespace_t namespc = (namespace_t)declaration->namespc;
2317 type_t *const orig_type = declaration->type;
2318 const type_t *const type = skip_typeref(orig_type);
2319 if (is_type_function(type) &&
2320 type->function.unspecified_parameters &&
2321 warning.strict_prototypes) {
2322 warningf(declaration->source_position,
2323 "function declaration '%#T' is not a prototype",
2324 orig_type, declaration->symbol);
2327 if (is_function_definition && warning.main && is_sym_main(symbol)) {
2328 check_type_of_main(declaration, &type->function);
2331 declaration_t *const previous_declaration = get_declaration(symbol, namespc);
2332 assert(declaration != previous_declaration);
2333 if (previous_declaration != NULL) {
2334 if (previous_declaration->parent_scope == scope) {
2335 /* can happen for K&R style declarations */
2336 if(previous_declaration->type == NULL) {
2337 previous_declaration->type = declaration->type;
2340 const type_t *const prev_type = skip_typeref(previous_declaration->type);
2341 if (!types_compatible(type, prev_type)) {
2342 errorf(declaration->source_position,
2343 "declaration '%#T' is incompatible with previous declaration '%#T'",
2344 orig_type, symbol, previous_declaration->type, symbol);
2345 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2347 unsigned old_storage_class = previous_declaration->storage_class;
2348 unsigned new_storage_class = declaration->storage_class;
2350 /* pretend no storage class means extern for function declarations
2351 * (except if the previous declaration is neither none nor extern) */
2352 if (is_type_function(type)) {
2353 switch (old_storage_class) {
2354 case STORAGE_CLASS_NONE:
2355 old_storage_class = STORAGE_CLASS_EXTERN;
2357 case STORAGE_CLASS_EXTERN:
2358 if (is_function_definition) {
2359 if (warning.missing_prototypes &&
2360 prev_type->function.unspecified_parameters &&
2361 !is_sym_main(symbol)) {
2362 warningf(declaration->source_position, "no previous prototype for '%#T'", orig_type, symbol);
2364 } else if (new_storage_class == STORAGE_CLASS_NONE) {
2365 new_storage_class = STORAGE_CLASS_EXTERN;
2373 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2374 new_storage_class == STORAGE_CLASS_EXTERN) {
2375 warn_redundant_declaration:
2376 if (warning.redundant_decls) {
2377 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2378 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2380 } else if (current_function == NULL) {
2381 if (old_storage_class != STORAGE_CLASS_STATIC &&
2382 new_storage_class == STORAGE_CLASS_STATIC) {
2383 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2384 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2386 if (old_storage_class != STORAGE_CLASS_EXTERN && !is_function_definition) {
2387 goto warn_redundant_declaration;
2389 if (new_storage_class == STORAGE_CLASS_NONE) {
2390 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2394 if (old_storage_class == new_storage_class) {
2395 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2397 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2399 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2402 return previous_declaration;
2404 } else if (is_function_definition) {
2405 if (declaration->storage_class != STORAGE_CLASS_STATIC) {
2406 if (warning.missing_prototypes && !is_sym_main(symbol)) {
2407 warningf(declaration->source_position, "no previous prototype for '%#T'", orig_type, symbol);
2408 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
2409 warningf(declaration->source_position, "no previous declaration for '%#T'", orig_type, symbol);
2412 } else if (warning.missing_declarations &&
2413 scope == global_scope &&
2414 !is_type_function(type) && (
2415 declaration->storage_class == STORAGE_CLASS_NONE ||
2416 declaration->storage_class == STORAGE_CLASS_THREAD
2418 warningf(declaration->source_position, "no previous declaration for '%#T'", orig_type, symbol);
2421 assert(declaration->parent_scope == NULL);
2422 assert(declaration->symbol != NULL);
2423 assert(scope != NULL);
2425 declaration->parent_scope = scope;
2427 environment_push(declaration);
2428 return append_declaration(declaration);
2431 static declaration_t *record_declaration(declaration_t *declaration)
2433 return internal_record_declaration(declaration, false);
2436 static declaration_t *record_function_definition(declaration_t *declaration)
2438 return internal_record_declaration(declaration, true);
2441 static void parser_error_multiple_definition(declaration_t *declaration,
2442 const source_position_t source_position)
2444 errorf(source_position, "multiple definition of symbol '%Y'",
2445 declaration->symbol);
2446 errorf(declaration->source_position,
2447 "this is the location of the previous definition.");
2450 static bool is_declaration_specifier(const token_t *token,
2451 bool only_type_specifiers)
2453 switch(token->type) {
2457 return is_typedef_symbol(token->v.symbol);
2459 case T___extension__:
2462 return !only_type_specifiers;
2469 static void parse_init_declarator_rest(declaration_t *declaration)
2473 type_t *orig_type = declaration->type;
2474 type_t *type = type = skip_typeref(orig_type);
2476 if(declaration->init.initializer != NULL) {
2477 parser_error_multiple_definition(declaration, token.source_position);
2480 initializer_t *initializer = parse_initializer(type);
2482 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2483 * the array type size */
2484 if(is_type_array(type) && initializer != NULL) {
2485 array_type_t *array_type = &type->array;
2487 if(array_type->size == NULL) {
2488 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2490 cnst->base.datatype = type_size_t;
2492 switch (initializer->kind) {
2493 case INITIALIZER_LIST: {
2494 cnst->conste.v.int_value = initializer->list.len;
2498 case INITIALIZER_STRING: {
2499 cnst->conste.v.int_value = initializer->string.string.size;
2503 case INITIALIZER_WIDE_STRING: {
2504 cnst->conste.v.int_value = initializer->wide_string.string.size;
2509 panic("invalid initializer type");
2512 array_type->size = cnst;
2516 if(is_type_function(type)) {
2517 errorf(declaration->source_position,
2518 "initializers not allowed for function types at declator '%Y' (type '%T')",
2519 declaration->symbol, orig_type);
2521 declaration->init.initializer = initializer;
2525 /* parse rest of a declaration without any declarator */
2526 static void parse_anonymous_declaration_rest(
2527 const declaration_specifiers_t *specifiers,
2528 parsed_declaration_func finished_declaration)
2532 declaration_t *const declaration = allocate_declaration_zero();
2533 declaration->type = specifiers->type;
2534 declaration->storage_class = specifiers->storage_class;
2535 declaration->source_position = specifiers->source_position;
2537 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2538 warningf(declaration->source_position, "useless storage class in empty declaration");
2541 type_t *type = declaration->type;
2542 switch (type->kind) {
2543 case TYPE_COMPOUND_STRUCT:
2544 case TYPE_COMPOUND_UNION: {
2545 if (type->compound.declaration->symbol == NULL) {
2546 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2555 warningf(declaration->source_position, "empty declaration");
2559 finished_declaration(declaration);
2562 static void parse_declaration_rest(declaration_t *ndeclaration,
2563 const declaration_specifiers_t *specifiers,
2564 parsed_declaration_func finished_declaration)
2567 declaration_t *declaration = finished_declaration(ndeclaration);
2569 type_t *orig_type = declaration->type;
2570 type_t *type = skip_typeref(orig_type);
2572 if (type->kind != TYPE_FUNCTION &&
2573 declaration->is_inline &&
2574 is_type_valid(type)) {
2575 warningf(declaration->source_position,
2576 "variable '%Y' declared 'inline'\n", declaration->symbol);
2579 if(token.type == '=') {
2580 parse_init_declarator_rest(declaration);
2583 if(token.type != ',')
2587 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2592 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2594 symbol_t *symbol = declaration->symbol;
2595 if(symbol == NULL) {
2596 errorf(HERE, "anonymous declaration not valid as function parameter");
2599 namespace_t namespc = (namespace_t) declaration->namespc;
2600 if(namespc != NAMESPACE_NORMAL) {
2601 return record_declaration(declaration);
2604 declaration_t *previous_declaration = get_declaration(symbol, namespc);
2605 if(previous_declaration == NULL ||
2606 previous_declaration->parent_scope != scope) {
2607 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
2612 if(previous_declaration->type == NULL) {
2613 previous_declaration->type = declaration->type;
2614 previous_declaration->storage_class = declaration->storage_class;
2615 previous_declaration->parent_scope = scope;
2616 return previous_declaration;
2618 return record_declaration(declaration);
2622 static void parse_declaration(parsed_declaration_func finished_declaration)
2624 declaration_specifiers_t specifiers;
2625 memset(&specifiers, 0, sizeof(specifiers));
2626 parse_declaration_specifiers(&specifiers);
2628 if(token.type == ';') {
2629 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2631 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2632 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2636 static void parse_kr_declaration_list(declaration_t *declaration)
2638 type_t *type = skip_typeref(declaration->type);
2639 if(!is_type_function(type))
2642 if(!type->function.kr_style_parameters)
2645 /* push function parameters */
2646 int top = environment_top();
2647 scope_t *last_scope = scope;
2648 set_scope(&declaration->scope);
2650 declaration_t *parameter = declaration->scope.declarations;
2651 for( ; parameter != NULL; parameter = parameter->next) {
2652 assert(parameter->parent_scope == NULL);
2653 parameter->parent_scope = scope;
2654 environment_push(parameter);
2657 /* parse declaration list */
2658 while(is_declaration_specifier(&token, false)) {
2659 parse_declaration(finished_kr_declaration);
2662 /* pop function parameters */
2663 assert(scope == &declaration->scope);
2664 set_scope(last_scope);
2665 environment_pop_to(top);
2667 /* update function type */
2668 type_t *new_type = duplicate_type(type);
2669 new_type->function.kr_style_parameters = false;
2671 function_parameter_t *parameters = NULL;
2672 function_parameter_t *last_parameter = NULL;
2674 declaration_t *parameter_declaration = declaration->scope.declarations;
2675 for( ; parameter_declaration != NULL;
2676 parameter_declaration = parameter_declaration->next) {
2677 type_t *parameter_type = parameter_declaration->type;
2678 if(parameter_type == NULL) {
2680 errorf(HERE, "no type specified for function parameter '%Y'",
2681 parameter_declaration->symbol);
2683 if (warning.implicit_int) {
2684 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
2685 parameter_declaration->symbol);
2687 parameter_type = type_int;
2688 parameter_declaration->type = parameter_type;
2692 semantic_parameter(parameter_declaration);
2693 parameter_type = parameter_declaration->type;
2695 function_parameter_t *function_parameter
2696 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2697 memset(function_parameter, 0, sizeof(function_parameter[0]));
2699 function_parameter->type = parameter_type;
2700 if(last_parameter != NULL) {
2701 last_parameter->next = function_parameter;
2703 parameters = function_parameter;
2705 last_parameter = function_parameter;
2707 new_type->function.parameters = parameters;
2709 type = typehash_insert(new_type);
2710 if(type != new_type) {
2711 obstack_free(type_obst, new_type);
2714 declaration->type = type;
2717 static bool first_err = true;
2720 * When called with first_err set, prints the name of the current function,
2723 static void print_in_function(void) {
2726 diagnosticf("%s: In function '%Y':\n",
2727 current_function->source_position.input_name,
2728 current_function->symbol);
2733 * Check if all labels are defined in the current function.
2734 * Check if all labels are used in the current function.
2736 static void check_labels(void)
2738 for (const goto_statement_t *goto_statement = goto_first;
2739 goto_statement != NULL;
2740 goto_statement = goto_statement->next) {
2741 declaration_t *label = goto_statement->label;
2744 if (label->source_position.input_name == NULL) {
2745 print_in_function();
2746 errorf(goto_statement->statement.source_position,
2747 "label '%Y' used but not defined", label->symbol);
2750 goto_first = goto_last = NULL;
2752 if (warning.unused_label) {
2753 for (const label_statement_t *label_statement = label_first;
2754 label_statement != NULL;
2755 label_statement = label_statement->next) {
2756 const declaration_t *label = label_statement->label;
2758 if (! label->used) {
2759 print_in_function();
2760 warningf(label_statement->statement.source_position,
2761 "label '%Y' defined but not used", label->symbol);
2765 label_first = label_last = NULL;
2769 * Check declarations of current_function for unused entities.
2771 static void check_declarations(void)
2773 if (warning.unused_parameter) {
2774 const scope_t *scope = ¤t_function->scope;
2776 const declaration_t *parameter = scope->declarations;
2777 for (; parameter != NULL; parameter = parameter->next) {
2778 if (! parameter->used) {
2779 print_in_function();
2780 warningf(parameter->source_position,
2781 "unused parameter '%Y'", parameter->symbol);
2785 if (warning.unused_variable) {
2789 static void parse_external_declaration(void)
2791 /* function-definitions and declarations both start with declaration
2793 declaration_specifiers_t specifiers;
2794 memset(&specifiers, 0, sizeof(specifiers));
2795 parse_declaration_specifiers(&specifiers);
2797 /* must be a declaration */
2798 if(token.type == ';') {
2799 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2803 /* declarator is common to both function-definitions and declarations */
2804 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2806 /* must be a declaration */
2807 if(token.type == ',' || token.type == '=' || token.type == ';') {
2808 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2812 /* must be a function definition */
2813 parse_kr_declaration_list(ndeclaration);
2815 if(token.type != '{') {
2816 parse_error_expected("while parsing function definition", '{', 0);
2821 type_t *type = ndeclaration->type;
2823 /* note that we don't skip typerefs: the standard doesn't allow them here
2824 * (so we can't use is_type_function here) */
2825 if(type->kind != TYPE_FUNCTION) {
2826 if (is_type_valid(type)) {
2827 errorf(HERE, "declarator '%#T' has a body but is not a function type",
2828 type, ndeclaration->symbol);
2834 /* § 6.7.5.3 (14) a function definition with () means no
2835 * parameters (and not unspecified parameters) */
2836 if(type->function.unspecified_parameters) {
2837 type_t *duplicate = duplicate_type(type);
2838 duplicate->function.unspecified_parameters = false;
2840 type = typehash_insert(duplicate);
2841 if(type != duplicate) {
2842 obstack_free(type_obst, duplicate);
2844 ndeclaration->type = type;
2847 declaration_t *const declaration = record_function_definition(ndeclaration);
2848 if(ndeclaration != declaration) {
2849 declaration->scope = ndeclaration->scope;
2851 type = skip_typeref(declaration->type);
2853 /* push function parameters and switch scope */
2854 int top = environment_top();
2855 scope_t *last_scope = scope;
2856 set_scope(&declaration->scope);
2858 declaration_t *parameter = declaration->scope.declarations;
2859 for( ; parameter != NULL; parameter = parameter->next) {
2860 if(parameter->parent_scope == &ndeclaration->scope) {
2861 parameter->parent_scope = scope;
2863 assert(parameter->parent_scope == NULL
2864 || parameter->parent_scope == scope);
2865 parameter->parent_scope = scope;
2866 environment_push(parameter);
2869 if(declaration->init.statement != NULL) {
2870 parser_error_multiple_definition(declaration, token.source_position);
2872 goto end_of_parse_external_declaration;
2874 /* parse function body */
2875 int label_stack_top = label_top();
2876 declaration_t *old_current_function = current_function;
2877 current_function = declaration;
2879 declaration->init.statement = parse_compound_statement();
2882 check_declarations();
2884 assert(current_function == declaration);
2885 current_function = old_current_function;
2886 label_pop_to(label_stack_top);
2889 end_of_parse_external_declaration:
2890 assert(scope == &declaration->scope);
2891 set_scope(last_scope);
2892 environment_pop_to(top);
2895 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2897 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2898 type->bitfield.base = base;
2899 type->bitfield.size = size;
2904 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2906 /* TODO: check constraints for struct declarations (in specifiers) */
2908 declaration_t *declaration;
2910 if(token.type == ':') {
2913 type_t *base_type = specifiers->type;
2914 expression_t *size = parse_constant_expression();
2916 type_t *type = make_bitfield_type(base_type, size);
2918 declaration = allocate_declaration_zero();
2919 declaration->namespc = NAMESPACE_NORMAL;
2920 declaration->storage_class = STORAGE_CLASS_NONE;
2921 declaration->source_position = token.source_position;
2922 declaration->modifiers = specifiers->decl_modifiers;
2923 declaration->type = type;
2925 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2927 if(token.type == ':') {
2929 expression_t *size = parse_constant_expression();
2931 type_t *type = make_bitfield_type(declaration->type, size);
2932 declaration->type = type;
2935 record_declaration(declaration);
2937 if(token.type != ',')
2944 static void parse_compound_type_entries(void)
2948 while(token.type != '}' && token.type != T_EOF) {
2949 declaration_specifiers_t specifiers;
2950 memset(&specifiers, 0, sizeof(specifiers));
2951 parse_declaration_specifiers(&specifiers);
2953 parse_struct_declarators(&specifiers);
2955 if(token.type == T_EOF) {
2956 errorf(HERE, "EOF while parsing struct");
2961 static type_t *parse_typename(void)
2963 declaration_specifiers_t specifiers;
2964 memset(&specifiers, 0, sizeof(specifiers));
2965 parse_declaration_specifiers(&specifiers);
2966 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2967 /* TODO: improve error message, user does probably not know what a
2968 * storage class is...
2970 errorf(HERE, "typename may not have a storage class");
2973 type_t *result = parse_abstract_declarator(specifiers.type);
2981 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2982 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2983 expression_t *left);
2985 typedef struct expression_parser_function_t expression_parser_function_t;
2986 struct expression_parser_function_t {
2987 unsigned precedence;
2988 parse_expression_function parser;
2989 unsigned infix_precedence;
2990 parse_expression_infix_function infix_parser;
2993 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2996 * Creates a new invalid expression.
2998 static expression_t *create_invalid_expression(void)
3000 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
3001 expression->base.source_position = token.source_position;
3006 * Prints an error message if an expression was expected but not read
3008 static expression_t *expected_expression_error(void)
3010 /* skip the error message if the error token was read */
3011 if (token.type != T_ERROR) {
3012 errorf(HERE, "expected expression, got token '%K'", &token);
3016 return create_invalid_expression();
3020 * Parse a string constant.
3022 static expression_t *parse_string_const(void)
3024 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
3025 cnst->base.datatype = type_string;
3026 cnst->string.value = parse_string_literals();
3032 * Parse a wide string constant.
3034 static expression_t *parse_wide_string_const(void)
3036 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
3037 cnst->base.datatype = type_wchar_t_ptr;
3038 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
3044 * Parse an integer constant.
3046 static expression_t *parse_int_const(void)
3048 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
3049 cnst->base.datatype = token.datatype;
3050 cnst->conste.v.int_value = token.v.intvalue;
3058 * Parse a float constant.
3060 static expression_t *parse_float_const(void)
3062 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
3063 cnst->base.datatype = token.datatype;
3064 cnst->conste.v.float_value = token.v.floatvalue;
3071 static declaration_t *create_implicit_function(symbol_t *symbol,
3072 const source_position_t source_position)
3074 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
3075 ntype->function.return_type = type_int;
3076 ntype->function.unspecified_parameters = true;
3078 type_t *type = typehash_insert(ntype);
3083 declaration_t *const declaration = allocate_declaration_zero();
3084 declaration->storage_class = STORAGE_CLASS_EXTERN;
3085 declaration->type = type;
3086 declaration->symbol = symbol;
3087 declaration->source_position = source_position;
3088 declaration->parent_scope = global_scope;
3090 scope_t *old_scope = scope;
3091 set_scope(global_scope);
3093 environment_push(declaration);
3094 /* prepends the declaration to the global declarations list */
3095 declaration->next = scope->declarations;
3096 scope->declarations = declaration;
3098 assert(scope == global_scope);
3099 set_scope(old_scope);
3105 * Creates a return_type (func)(argument_type) function type if not
3108 * @param return_type the return type
3109 * @param argument_type the argument type
3111 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
3113 function_parameter_t *parameter
3114 = obstack_alloc(type_obst, sizeof(parameter[0]));
3115 memset(parameter, 0, sizeof(parameter[0]));
3116 parameter->type = argument_type;
3118 type_t *type = allocate_type_zero(TYPE_FUNCTION);
3119 type->function.return_type = return_type;
3120 type->function.parameters = parameter;
3122 type_t *result = typehash_insert(type);
3123 if(result != type) {
3131 * Creates a function type for some function like builtins.
3133 * @param symbol the symbol describing the builtin
3135 static type_t *get_builtin_symbol_type(symbol_t *symbol)
3137 switch(symbol->ID) {
3138 case T___builtin_alloca:
3139 return make_function_1_type(type_void_ptr, type_size_t);
3140 case T___builtin_nan:
3141 return make_function_1_type(type_double, type_string);
3142 case T___builtin_nanf:
3143 return make_function_1_type(type_float, type_string);
3144 case T___builtin_nand:
3145 return make_function_1_type(type_long_double, type_string);
3146 case T___builtin_va_end:
3147 return make_function_1_type(type_void, type_valist);
3149 panic("not implemented builtin symbol found");
3154 * Performs automatic type cast as described in § 6.3.2.1.
3156 * @param orig_type the original type
3158 static type_t *automatic_type_conversion(type_t *orig_type)
3160 type_t *type = skip_typeref(orig_type);
3161 if(is_type_array(type)) {
3162 array_type_t *array_type = &type->array;
3163 type_t *element_type = array_type->element_type;
3164 unsigned qualifiers = array_type->type.qualifiers;
3166 return make_pointer_type(element_type, qualifiers);
3169 if(is_type_function(type)) {
3170 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3177 * reverts the automatic casts of array to pointer types and function
3178 * to function-pointer types as defined § 6.3.2.1
3180 type_t *revert_automatic_type_conversion(const expression_t *expression)
3182 switch (expression->kind) {
3183 case EXPR_REFERENCE: return expression->reference.declaration->type;
3184 case EXPR_SELECT: return expression->select.compound_entry->type;
3186 case EXPR_UNARY_DEREFERENCE: {
3187 const expression_t *const value = expression->unary.value;
3188 type_t *const type = skip_typeref(value->base.datatype);
3189 assert(is_type_pointer(type));
3190 return type->pointer.points_to;
3193 case EXPR_BUILTIN_SYMBOL:
3194 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
3196 case EXPR_ARRAY_ACCESS: {
3197 const expression_t *const array_ref = expression->array_access.array_ref;
3198 type_t *const type_left = skip_typeref(array_ref->base.datatype);
3199 if (!is_type_valid(type_left))
3201 assert(is_type_pointer(type_left));
3202 return type_left->pointer.points_to;
3208 return expression->base.datatype;
3211 static expression_t *parse_reference(void)
3213 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3215 reference_expression_t *ref = &expression->reference;
3216 ref->symbol = token.v.symbol;
3218 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3220 source_position_t source_position = token.source_position;
3223 if(declaration == NULL) {
3224 if (! strict_mode && token.type == '(') {
3225 /* an implicitly defined function */
3226 if (warning.implicit_function_declaration) {
3227 warningf(HERE, "implicit declaration of function '%Y'",
3231 declaration = create_implicit_function(ref->symbol,
3234 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3239 type_t *type = declaration->type;
3241 /* we always do the auto-type conversions; the & and sizeof parser contains
3242 * code to revert this! */
3243 type = automatic_type_conversion(type);
3245 ref->declaration = declaration;
3246 ref->expression.datatype = type;
3248 /* this declaration is used */
3249 declaration->used = true;
3254 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3258 /* TODO check if explicit cast is allowed and issue warnings/errors */
3261 static expression_t *parse_cast(void)
3263 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3265 cast->base.source_position = token.source_position;
3267 type_t *type = parse_typename();
3270 expression_t *value = parse_sub_expression(20);
3272 check_cast_allowed(value, type);
3274 cast->base.datatype = type;
3275 cast->unary.value = value;
3280 static expression_t *parse_statement_expression(void)
3282 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3284 statement_t *statement = parse_compound_statement();
3285 expression->statement.statement = statement;
3286 expression->base.source_position = statement->base.source_position;
3288 /* find last statement and use its type */
3289 type_t *type = type_void;
3290 const statement_t *stmt = statement->compound.statements;
3292 while (stmt->base.next != NULL)
3293 stmt = stmt->base.next;
3295 if (stmt->kind == STATEMENT_EXPRESSION) {
3296 type = stmt->expression.expression->base.datatype;
3299 warningf(expression->base.source_position, "empty statement expression ({})");
3301 expression->base.datatype = type;
3308 static expression_t *parse_brace_expression(void)
3312 switch(token.type) {
3314 /* gcc extension: a statement expression */
3315 return parse_statement_expression();
3319 return parse_cast();
3321 if(is_typedef_symbol(token.v.symbol)) {
3322 return parse_cast();
3326 expression_t *result = parse_expression();
3332 static expression_t *parse_function_keyword(void)
3337 if (current_function == NULL) {
3338 errorf(HERE, "'__func__' used outside of a function");
3341 string_literal_expression_t *expression
3342 = allocate_ast_zero(sizeof(expression[0]));
3344 expression->expression.kind = EXPR_FUNCTION;
3345 expression->expression.datatype = type_string;
3347 return (expression_t*) expression;
3350 static expression_t *parse_pretty_function_keyword(void)
3352 eat(T___PRETTY_FUNCTION__);
3355 if (current_function == NULL) {
3356 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3359 string_literal_expression_t *expression
3360 = allocate_ast_zero(sizeof(expression[0]));
3362 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3363 expression->expression.datatype = type_string;
3365 return (expression_t*) expression;
3368 static designator_t *parse_designator(void)
3370 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3372 if(token.type != T_IDENTIFIER) {
3373 parse_error_expected("while parsing member designator",
3378 result->symbol = token.v.symbol;
3381 designator_t *last_designator = result;
3383 if(token.type == '.') {
3385 if(token.type != T_IDENTIFIER) {
3386 parse_error_expected("while parsing member designator",
3391 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3392 designator->symbol = token.v.symbol;
3395 last_designator->next = designator;
3396 last_designator = designator;
3399 if(token.type == '[') {
3401 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3402 designator->array_access = parse_expression();
3403 if(designator->array_access == NULL) {
3409 last_designator->next = designator;
3410 last_designator = designator;
3419 static expression_t *parse_offsetof(void)
3421 eat(T___builtin_offsetof);
3423 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3424 expression->base.datatype = type_size_t;
3427 expression->offsetofe.type = parse_typename();
3429 expression->offsetofe.designator = parse_designator();
3435 static expression_t *parse_va_start(void)
3437 eat(T___builtin_va_start);
3439 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3442 expression->va_starte.ap = parse_assignment_expression();
3444 expression_t *const expr = parse_assignment_expression();
3445 if (expr->kind == EXPR_REFERENCE) {
3446 declaration_t *const decl = expr->reference.declaration;
3447 if (decl->parent_scope == ¤t_function->scope &&
3448 decl->next == NULL) {
3449 expression->va_starte.parameter = decl;
3454 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3456 return create_invalid_expression();
3459 static expression_t *parse_va_arg(void)
3461 eat(T___builtin_va_arg);
3463 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3466 expression->va_arge.ap = parse_assignment_expression();
3468 expression->base.datatype = parse_typename();
3474 static expression_t *parse_builtin_symbol(void)
3476 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3478 symbol_t *symbol = token.v.symbol;
3480 expression->builtin_symbol.symbol = symbol;
3483 type_t *type = get_builtin_symbol_type(symbol);
3484 type = automatic_type_conversion(type);
3486 expression->base.datatype = type;
3490 static expression_t *parse_builtin_constant(void)
3492 eat(T___builtin_constant_p);
3494 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3497 expression->builtin_constant.value = parse_assignment_expression();
3499 expression->base.datatype = type_int;
3504 static expression_t *parse_builtin_prefetch(void)
3506 eat(T___builtin_prefetch);
3508 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3511 expression->builtin_prefetch.adr = parse_assignment_expression();
3512 if (token.type == ',') {
3514 expression->builtin_prefetch.rw = parse_assignment_expression();
3516 if (token.type == ',') {
3518 expression->builtin_prefetch.locality = parse_assignment_expression();
3521 expression->base.datatype = type_void;
3526 static expression_t *parse_compare_builtin(void)
3528 expression_t *expression;
3530 switch(token.type) {
3531 case T___builtin_isgreater:
3532 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3534 case T___builtin_isgreaterequal:
3535 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3537 case T___builtin_isless:
3538 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3540 case T___builtin_islessequal:
3541 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3543 case T___builtin_islessgreater:
3544 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3546 case T___builtin_isunordered:
3547 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3550 panic("invalid compare builtin found");
3553 expression->base.source_position = HERE;
3557 expression->binary.left = parse_assignment_expression();
3559 expression->binary.right = parse_assignment_expression();
3562 type_t *const orig_type_left = expression->binary.left->base.datatype;
3563 type_t *const orig_type_right = expression->binary.right->base.datatype;
3565 type_t *const type_left = skip_typeref(orig_type_left);
3566 type_t *const type_right = skip_typeref(orig_type_right);
3567 if(!is_type_float(type_left) && !is_type_float(type_right)) {
3568 if (is_type_valid(type_left) && is_type_valid(type_right)) {
3569 type_error_incompatible("invalid operands in comparison",
3570 expression->base.source_position, orig_type_left, orig_type_right);
3573 semantic_comparison(&expression->binary);
3579 static expression_t *parse_builtin_expect(void)
3581 eat(T___builtin_expect);
3583 expression_t *expression
3584 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3587 expression->binary.left = parse_assignment_expression();
3589 expression->binary.right = parse_constant_expression();
3592 expression->base.datatype = expression->binary.left->base.datatype;
3597 static expression_t *parse_assume(void) {
3600 expression_t *expression
3601 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3604 expression->unary.value = parse_assignment_expression();
3607 expression->base.datatype = type_void;
3611 static expression_t *parse_primary_expression(void)
3613 switch(token.type) {
3615 return parse_int_const();
3616 case T_FLOATINGPOINT:
3617 return parse_float_const();
3618 case T_STRING_LITERAL:
3619 return parse_string_const();
3620 case T_WIDE_STRING_LITERAL:
3621 return parse_wide_string_const();
3623 return parse_reference();
3624 case T___FUNCTION__:
3626 return parse_function_keyword();
3627 case T___PRETTY_FUNCTION__:
3628 return parse_pretty_function_keyword();
3629 case T___builtin_offsetof:
3630 return parse_offsetof();
3631 case T___builtin_va_start:
3632 return parse_va_start();
3633 case T___builtin_va_arg:
3634 return parse_va_arg();
3635 case T___builtin_expect:
3636 return parse_builtin_expect();
3637 case T___builtin_nanf:
3638 case T___builtin_alloca:
3639 case T___builtin_va_end:
3640 return parse_builtin_symbol();
3641 case T___builtin_isgreater:
3642 case T___builtin_isgreaterequal:
3643 case T___builtin_isless:
3644 case T___builtin_islessequal:
3645 case T___builtin_islessgreater:
3646 case T___builtin_isunordered:
3647 return parse_compare_builtin();
3648 case T___builtin_constant_p:
3649 return parse_builtin_constant();
3650 case T___builtin_prefetch:
3651 return parse_builtin_prefetch();
3653 return parse_assume();
3656 return parse_brace_expression();
3659 errorf(HERE, "unexpected token '%K'", &token);
3662 return create_invalid_expression();
3666 * Check if the expression has the character type and issue a warning then.
3668 static void check_for_char_index_type(const expression_t *expression) {
3669 type_t *const type = expression->base.datatype;
3670 const type_t *const base_type = skip_typeref(type);
3672 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
3673 warning.char_subscripts) {
3674 warningf(expression->base.source_position,
3675 "array subscript has type '%T'", type);
3679 static expression_t *parse_array_expression(unsigned precedence,
3686 expression_t *inside = parse_expression();
3688 array_access_expression_t *array_access
3689 = allocate_ast_zero(sizeof(array_access[0]));
3691 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3693 type_t *const orig_type_left = left->base.datatype;
3694 type_t *const orig_type_inside = inside->base.datatype;
3696 type_t *const type_left = skip_typeref(orig_type_left);
3697 type_t *const type_inside = skip_typeref(orig_type_inside);
3699 type_t *return_type;
3700 if (is_type_pointer(type_left)) {
3701 return_type = type_left->pointer.points_to;
3702 array_access->array_ref = left;
3703 array_access->index = inside;
3704 check_for_char_index_type(inside);
3705 } else if (is_type_pointer(type_inside)) {
3706 return_type = type_inside->pointer.points_to;
3707 array_access->array_ref = inside;
3708 array_access->index = left;
3709 array_access->flipped = true;
3710 check_for_char_index_type(left);
3712 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
3714 "array access on object with non-pointer types '%T', '%T'",
3715 orig_type_left, orig_type_inside);
3717 return_type = type_error_type;
3718 array_access->array_ref = create_invalid_expression();
3721 if(token.type != ']') {
3722 parse_error_expected("Problem while parsing array access", ']', 0);
3723 return (expression_t*) array_access;
3727 return_type = automatic_type_conversion(return_type);
3728 array_access->expression.datatype = return_type;
3730 return (expression_t*) array_access;
3733 static expression_t *parse_typeprop(expression_kind_t kind, unsigned precedence)
3735 expression_t *tp_expression
3736 = allocate_expression_zero(kind);
3737 tp_expression->base.datatype = type_size_t;
3739 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3741 tp_expression->typeprop.type = parse_typename();
3744 expression_t *expression = parse_sub_expression(precedence);
3745 expression->base.datatype = revert_automatic_type_conversion(expression);
3747 tp_expression->typeprop.type = expression->base.datatype;
3748 tp_expression->typeprop.tp_expression = expression;
3751 return tp_expression;
3754 static expression_t *parse_sizeof(unsigned precedence)
3757 return parse_typeprop(EXPR_SIZEOF, precedence);
3760 static expression_t *parse_alignof(unsigned precedence)
3763 return parse_typeprop(EXPR_SIZEOF, precedence);
3766 static expression_t *parse_select_expression(unsigned precedence,
3767 expression_t *compound)
3770 assert(token.type == '.' || token.type == T_MINUSGREATER);
3772 bool is_pointer = (token.type == T_MINUSGREATER);
3775 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3776 select->select.compound = compound;
3778 if(token.type != T_IDENTIFIER) {
3779 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3782 symbol_t *symbol = token.v.symbol;
3783 select->select.symbol = symbol;
3786 type_t *const orig_type = compound->base.datatype;
3787 type_t *const type = skip_typeref(orig_type);
3789 type_t *type_left = type;
3791 if (!is_type_pointer(type)) {
3792 if (is_type_valid(type)) {
3793 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3795 return create_invalid_expression();
3797 type_left = type->pointer.points_to;
3799 type_left = skip_typeref(type_left);
3801 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
3802 type_left->kind != TYPE_COMPOUND_UNION) {
3803 if (is_type_valid(type_left)) {
3804 errorf(HERE, "request for member '%Y' in something not a struct or "
3805 "union, but '%T'", symbol, type_left);
3807 return create_invalid_expression();
3810 declaration_t *const declaration = type_left->compound.declaration;
3812 if(!declaration->init.is_defined) {
3813 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3815 return create_invalid_expression();
3818 declaration_t *iter = declaration->scope.declarations;
3819 for( ; iter != NULL; iter = iter->next) {
3820 if(iter->symbol == symbol) {
3825 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3826 return create_invalid_expression();
3829 /* we always do the auto-type conversions; the & and sizeof parser contains
3830 * code to revert this! */
3831 type_t *expression_type = automatic_type_conversion(iter->type);
3833 select->select.compound_entry = iter;
3834 select->base.datatype = expression_type;
3836 if(expression_type->kind == TYPE_BITFIELD) {
3837 expression_t *extract
3838 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3839 extract->unary.value = select;
3840 extract->base.datatype = expression_type->bitfield.base;
3849 * Parse a call expression, ie. expression '( ... )'.
3851 * @param expression the function address
3853 static expression_t *parse_call_expression(unsigned precedence,
3854 expression_t *expression)
3857 expression_t *result = allocate_expression_zero(EXPR_CALL);
3859 call_expression_t *call = &result->call;
3860 call->function = expression;
3862 type_t *const orig_type = expression->base.datatype;
3863 type_t *const type = skip_typeref(orig_type);
3865 function_type_t *function_type = NULL;
3866 if (is_type_pointer(type)) {
3867 type_t *const to_type = skip_typeref(type->pointer.points_to);
3869 if (is_type_function(to_type)) {
3870 function_type = &to_type->function;
3871 call->expression.datatype = function_type->return_type;
3875 if (function_type == NULL && is_type_valid(type)) {
3876 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3879 /* parse arguments */
3882 if(token.type != ')') {
3883 call_argument_t *last_argument = NULL;
3886 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3888 argument->expression = parse_assignment_expression();
3889 if(last_argument == NULL) {
3890 call->arguments = argument;
3892 last_argument->next = argument;
3894 last_argument = argument;
3896 if(token.type != ',')
3903 if(function_type != NULL) {
3904 function_parameter_t *parameter = function_type->parameters;
3905 call_argument_t *argument = call->arguments;
3906 for( ; parameter != NULL && argument != NULL;
3907 parameter = parameter->next, argument = argument->next) {
3908 type_t *expected_type = parameter->type;
3909 /* TODO report scope in error messages */
3910 expression_t *const arg_expr = argument->expression;
3911 type_t *const res_type = semantic_assign(expected_type, arg_expr, "function call");
3912 if (res_type == NULL) {
3913 /* TODO improve error message */
3914 errorf(arg_expr->base.source_position,
3915 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
3916 arg_expr, arg_expr->base.datatype, expected_type);
3918 argument->expression = create_implicit_cast(argument->expression, expected_type);
3921 /* too few parameters */
3922 if(parameter != NULL) {
3923 errorf(HERE, "too few arguments to function '%E'", expression);
3924 } else if(argument != NULL) {
3925 /* too many parameters */
3926 if(!function_type->variadic
3927 && !function_type->unspecified_parameters) {
3928 errorf(HERE, "too many arguments to function '%E'", expression);
3930 /* do default promotion */
3931 for( ; argument != NULL; argument = argument->next) {
3932 type_t *type = argument->expression->base.datatype;
3934 type = skip_typeref(type);
3935 if(is_type_integer(type)) {
3936 type = promote_integer(type);
3937 } else if(type == type_float) {
3941 argument->expression
3942 = create_implicit_cast(argument->expression, type);
3945 check_format(&result->call);
3948 check_format(&result->call);
3955 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3957 static bool same_compound_type(const type_t *type1, const type_t *type2)
3960 is_type_compound(type1) &&
3961 type1->kind == type2->kind &&
3962 type1->compound.declaration == type2->compound.declaration;
3966 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3968 * @param expression the conditional expression
3970 static expression_t *parse_conditional_expression(unsigned precedence,
3971 expression_t *expression)
3975 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3977 conditional_expression_t *conditional = &result->conditional;
3978 conditional->condition = expression;
3981 type_t *const condition_type_orig = expression->base.datatype;
3982 type_t *const condition_type = skip_typeref(condition_type_orig);
3983 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
3984 type_error("expected a scalar type in conditional condition",
3985 expression->base.source_position, condition_type_orig);
3988 expression_t *true_expression = parse_expression();
3990 expression_t *false_expression = parse_sub_expression(precedence);
3992 conditional->true_expression = true_expression;
3993 conditional->false_expression = false_expression;
3995 type_t *const orig_true_type = true_expression->base.datatype;
3996 type_t *const orig_false_type = false_expression->base.datatype;
3997 type_t *const true_type = skip_typeref(orig_true_type);
3998 type_t *const false_type = skip_typeref(orig_false_type);
4001 type_t *result_type;
4002 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
4003 result_type = semantic_arithmetic(true_type, false_type);
4005 true_expression = create_implicit_cast(true_expression, result_type);
4006 false_expression = create_implicit_cast(false_expression, result_type);
4008 conditional->true_expression = true_expression;
4009 conditional->false_expression = false_expression;
4010 conditional->expression.datatype = result_type;
4011 } else if (same_compound_type(true_type, false_type) || (
4012 is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
4013 is_type_atomic(false_type, ATOMIC_TYPE_VOID)
4015 /* just take 1 of the 2 types */
4016 result_type = true_type;
4017 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
4018 && pointers_compatible(true_type, false_type)) {
4020 result_type = true_type;
4023 if (is_type_valid(true_type) && is_type_valid(false_type)) {
4024 type_error_incompatible("while parsing conditional",
4025 expression->base.source_position, true_type,
4028 result_type = type_error_type;
4031 conditional->expression.datatype = result_type;
4036 * Parse an extension expression.
4038 static expression_t *parse_extension(unsigned precedence)
4040 eat(T___extension__);
4042 /* TODO enable extensions */
4043 expression_t *expression = parse_sub_expression(precedence);
4044 /* TODO disable extensions */
4048 static expression_t *parse_builtin_classify_type(const unsigned precedence)
4050 eat(T___builtin_classify_type);
4052 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
4053 result->base.datatype = type_int;
4056 expression_t *expression = parse_sub_expression(precedence);
4058 result->classify_type.type_expression = expression;
4063 static void semantic_incdec(unary_expression_t *expression)
4065 type_t *const orig_type = expression->value->base.datatype;
4066 type_t *const type = skip_typeref(orig_type);
4067 /* TODO !is_type_real && !is_type_pointer */
4068 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
4069 if (is_type_valid(type)) {
4070 /* TODO: improve error message */
4071 errorf(HERE, "operation needs an arithmetic or pointer type");
4076 expression->expression.datatype = orig_type;
4079 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
4081 type_t *const orig_type = expression->value->base.datatype;
4082 type_t *const type = skip_typeref(orig_type);
4083 if(!is_type_arithmetic(type)) {
4084 if (is_type_valid(type)) {
4085 /* TODO: improve error message */
4086 errorf(HERE, "operation needs an arithmetic type");
4091 expression->expression.datatype = orig_type;
4094 static void semantic_unexpr_scalar(unary_expression_t *expression)
4096 type_t *const orig_type = expression->value->base.datatype;
4097 type_t *const type = skip_typeref(orig_type);
4098 if (!is_type_scalar(type)) {
4099 if (is_type_valid(type)) {
4100 errorf(HERE, "operand of ! must be of scalar type");
4105 expression->expression.datatype = orig_type;
4108 static void semantic_unexpr_integer(unary_expression_t *expression)
4110 type_t *const orig_type = expression->value->base.datatype;
4111 type_t *const type = skip_typeref(orig_type);
4112 if (!is_type_integer(type)) {
4113 if (is_type_valid(type)) {
4114 errorf(HERE, "operand of ~ must be of integer type");
4119 expression->expression.datatype = orig_type;
4122 static void semantic_dereference(unary_expression_t *expression)
4124 type_t *const orig_type = expression->value->base.datatype;
4125 type_t *const type = skip_typeref(orig_type);
4126 if(!is_type_pointer(type)) {
4127 if (is_type_valid(type)) {
4128 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4133 type_t *result_type = type->pointer.points_to;
4134 result_type = automatic_type_conversion(result_type);
4135 expression->expression.datatype = result_type;
4139 * Check the semantic of the address taken expression.
4141 static void semantic_take_addr(unary_expression_t *expression)
4143 expression_t *value = expression->value;
4144 value->base.datatype = revert_automatic_type_conversion(value);
4146 type_t *orig_type = value->base.datatype;
4147 if(!is_type_valid(orig_type))
4150 if(value->kind == EXPR_REFERENCE) {
4151 declaration_t *const declaration = value->reference.declaration;
4152 if(declaration != NULL) {
4153 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4154 errorf(expression->expression.source_position,
4155 "address of register variable '%Y' requested",
4156 declaration->symbol);
4158 declaration->address_taken = 1;
4162 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4165 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4166 static expression_t *parse_##unexpression_type(unsigned precedence) \
4170 expression_t *unary_expression \
4171 = allocate_expression_zero(unexpression_type); \
4172 unary_expression->base.source_position = HERE; \
4173 unary_expression->unary.value = parse_sub_expression(precedence); \
4175 sfunc(&unary_expression->unary); \
4177 return unary_expression; \
4180 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4181 semantic_unexpr_arithmetic)
4182 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4183 semantic_unexpr_arithmetic)
4184 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4185 semantic_unexpr_scalar)
4186 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4187 semantic_dereference)
4188 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4190 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4191 semantic_unexpr_integer)
4192 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4194 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4197 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4199 static expression_t *parse_##unexpression_type(unsigned precedence, \
4200 expression_t *left) \
4202 (void) precedence; \
4205 expression_t *unary_expression \
4206 = allocate_expression_zero(unexpression_type); \
4207 unary_expression->unary.value = left; \
4209 sfunc(&unary_expression->unary); \
4211 return unary_expression; \
4214 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4215 EXPR_UNARY_POSTFIX_INCREMENT,
4217 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4218 EXPR_UNARY_POSTFIX_DECREMENT,
4221 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4223 /* TODO: handle complex + imaginary types */
4225 /* § 6.3.1.8 Usual arithmetic conversions */
4226 if(type_left == type_long_double || type_right == type_long_double) {
4227 return type_long_double;
4228 } else if(type_left == type_double || type_right == type_double) {
4230 } else if(type_left == type_float || type_right == type_float) {
4234 type_right = promote_integer(type_right);
4235 type_left = promote_integer(type_left);
4237 if(type_left == type_right)
4240 bool signed_left = is_type_signed(type_left);
4241 bool signed_right = is_type_signed(type_right);
4242 int rank_left = get_rank(type_left);
4243 int rank_right = get_rank(type_right);
4244 if(rank_left < rank_right) {
4245 if(signed_left == signed_right || !signed_right) {
4251 if(signed_left == signed_right || !signed_left) {
4260 * Check the semantic restrictions for a binary expression.
4262 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4264 expression_t *const left = expression->left;
4265 expression_t *const right = expression->right;
4266 type_t *const orig_type_left = left->base.datatype;
4267 type_t *const orig_type_right = right->base.datatype;
4268 type_t *const type_left = skip_typeref(orig_type_left);
4269 type_t *const type_right = skip_typeref(orig_type_right);
4271 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4272 /* TODO: improve error message */
4273 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4274 errorf(HERE, "operation needs arithmetic types");
4279 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4280 expression->left = create_implicit_cast(left, arithmetic_type);
4281 expression->right = create_implicit_cast(right, arithmetic_type);
4282 expression->expression.datatype = arithmetic_type;
4285 static void semantic_shift_op(binary_expression_t *expression)
4287 expression_t *const left = expression->left;
4288 expression_t *const right = expression->right;
4289 type_t *const orig_type_left = left->base.datatype;
4290 type_t *const orig_type_right = right->base.datatype;
4291 type_t * type_left = skip_typeref(orig_type_left);
4292 type_t * type_right = skip_typeref(orig_type_right);
4294 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4295 /* TODO: improve error message */
4296 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4297 errorf(HERE, "operation needs integer types");
4302 type_left = promote_integer(type_left);
4303 type_right = promote_integer(type_right);
4305 expression->left = create_implicit_cast(left, type_left);
4306 expression->right = create_implicit_cast(right, type_right);
4307 expression->expression.datatype = type_left;
4310 static void semantic_add(binary_expression_t *expression)
4312 expression_t *const left = expression->left;
4313 expression_t *const right = expression->right;
4314 type_t *const orig_type_left = left->base.datatype;
4315 type_t *const orig_type_right = right->base.datatype;
4316 type_t *const type_left = skip_typeref(orig_type_left);
4317 type_t *const type_right = skip_typeref(orig_type_right);
4320 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4321 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4322 expression->left = create_implicit_cast(left, arithmetic_type);
4323 expression->right = create_implicit_cast(right, arithmetic_type);
4324 expression->expression.datatype = arithmetic_type;
4326 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4327 expression->expression.datatype = type_left;
4328 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4329 expression->expression.datatype = type_right;
4330 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4331 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4335 static void semantic_sub(binary_expression_t *expression)
4337 expression_t *const left = expression->left;
4338 expression_t *const right = expression->right;
4339 type_t *const orig_type_left = left->base.datatype;
4340 type_t *const orig_type_right = right->base.datatype;
4341 type_t *const type_left = skip_typeref(orig_type_left);
4342 type_t *const type_right = skip_typeref(orig_type_right);
4345 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4346 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4347 expression->left = create_implicit_cast(left, arithmetic_type);
4348 expression->right = create_implicit_cast(right, arithmetic_type);
4349 expression->expression.datatype = arithmetic_type;
4351 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4352 expression->expression.datatype = type_left;
4353 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4354 if(!pointers_compatible(type_left, type_right)) {
4355 errorf(HERE, "pointers to incompatible objects to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4357 expression->expression.datatype = type_ptrdiff_t;
4359 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4360 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4365 * Check the semantics of comparison expressions.
4367 * @param expression The expression to check.
4369 static void semantic_comparison(binary_expression_t *expression)
4371 expression_t *left = expression->left;
4372 expression_t *right = expression->right;
4373 type_t *orig_type_left = left->base.datatype;
4374 type_t *orig_type_right = right->base.datatype;
4376 type_t *type_left = skip_typeref(orig_type_left);
4377 type_t *type_right = skip_typeref(orig_type_right);
4379 /* TODO non-arithmetic types */
4380 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4381 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4382 expression->left = create_implicit_cast(left, arithmetic_type);
4383 expression->right = create_implicit_cast(right, arithmetic_type);
4384 expression->expression.datatype = arithmetic_type;
4385 if (warning.float_equal &&
4386 (expression->expression.kind == EXPR_BINARY_EQUAL ||
4387 expression->expression.kind == EXPR_BINARY_NOTEQUAL) &&
4388 is_type_float(arithmetic_type)) {
4389 warningf(expression->expression.source_position,
4390 "comparing floating point with == or != is unsafe");
4392 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4393 /* TODO check compatibility */
4394 } else if (is_type_pointer(type_left)) {
4395 expression->right = create_implicit_cast(right, type_left);
4396 } else if (is_type_pointer(type_right)) {
4397 expression->left = create_implicit_cast(left, type_right);
4398 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4399 type_error_incompatible("invalid operands in comparison",
4400 expression->expression.source_position,
4401 type_left, type_right);
4403 expression->expression.datatype = type_int;
4406 static void semantic_arithmetic_assign(binary_expression_t *expression)
4408 expression_t *left = expression->left;
4409 expression_t *right = expression->right;
4410 type_t *orig_type_left = left->base.datatype;
4411 type_t *orig_type_right = right->base.datatype;
4413 type_t *type_left = skip_typeref(orig_type_left);
4414 type_t *type_right = skip_typeref(orig_type_right);
4416 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4417 /* TODO: improve error message */
4418 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4419 errorf(HERE, "operation needs arithmetic types");
4424 /* combined instructions are tricky. We can't create an implicit cast on
4425 * the left side, because we need the uncasted form for the store.
4426 * The ast2firm pass has to know that left_type must be right_type
4427 * for the arithmetic operation and create a cast by itself */
4428 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4429 expression->right = create_implicit_cast(right, arithmetic_type);
4430 expression->expression.datatype = type_left;
4433 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4435 expression_t *const left = expression->left;
4436 expression_t *const right = expression->right;
4437 type_t *const orig_type_left = left->base.datatype;
4438 type_t *const orig_type_right = right->base.datatype;
4439 type_t *const type_left = skip_typeref(orig_type_left);
4440 type_t *const type_right = skip_typeref(orig_type_right);
4442 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4443 /* combined instructions are tricky. We can't create an implicit cast on
4444 * the left side, because we need the uncasted form for the store.
4445 * The ast2firm pass has to know that left_type must be right_type
4446 * for the arithmetic operation and create a cast by itself */
4447 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4448 expression->right = create_implicit_cast(right, arithmetic_type);
4449 expression->expression.datatype = type_left;
4450 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4451 expression->expression.datatype = type_left;
4452 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4453 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4458 * Check the semantic restrictions of a logical expression.
4460 static void semantic_logical_op(binary_expression_t *expression)
4462 expression_t *const left = expression->left;
4463 expression_t *const right = expression->right;
4464 type_t *const orig_type_left = left->base.datatype;
4465 type_t *const orig_type_right = right->base.datatype;
4466 type_t *const type_left = skip_typeref(orig_type_left);
4467 type_t *const type_right = skip_typeref(orig_type_right);
4469 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4470 /* TODO: improve error message */
4471 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4472 errorf(HERE, "operation needs scalar types");
4477 expression->expression.datatype = type_int;
4481 * Checks if a compound type has constant fields.
4483 static bool has_const_fields(const compound_type_t *type)
4485 const scope_t *scope = &type->declaration->scope;
4486 const declaration_t *declaration = scope->declarations;
4488 for (; declaration != NULL; declaration = declaration->next) {
4489 if (declaration->namespc != NAMESPACE_NORMAL)
4492 const type_t *decl_type = skip_typeref(declaration->type);
4493 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4501 * Check the semantic restrictions of a binary assign expression.
4503 static void semantic_binexpr_assign(binary_expression_t *expression)
4505 expression_t *left = expression->left;
4506 type_t *orig_type_left = left->base.datatype;
4508 type_t *type_left = revert_automatic_type_conversion(left);
4509 type_left = skip_typeref(orig_type_left);
4511 /* must be a modifiable lvalue */
4512 if (is_type_array(type_left)) {
4513 errorf(HERE, "cannot assign to arrays ('%E')", left);
4516 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4517 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4521 if(is_type_incomplete(type_left)) {
4523 "left-hand side of assignment '%E' has incomplete type '%T'",
4524 left, orig_type_left);
4527 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4528 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4529 left, orig_type_left);
4533 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
4535 if (res_type == NULL) {
4536 errorf(expression->expression.source_position,
4537 "cannot assign to '%T' from '%T'",
4538 orig_type_left, expression->right->base.datatype);
4540 expression->right = create_implicit_cast(expression->right, res_type);
4543 expression->expression.datatype = orig_type_left;
4546 static bool expression_has_effect(const expression_t *const expr)
4548 switch (expr->kind) {
4549 case EXPR_UNKNOWN: break;
4550 case EXPR_INVALID: break;
4551 case EXPR_REFERENCE: return false;
4552 case EXPR_CONST: return false;
4553 case EXPR_STRING_LITERAL: return false;
4554 case EXPR_WIDE_STRING_LITERAL: return false;
4556 const call_expression_t *const call = &expr->call;
4557 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
4560 switch (call->function->builtin_symbol.symbol->ID) {
4561 case T___builtin_va_end: return true;
4562 default: return false;
4565 case EXPR_CONDITIONAL: {
4566 const conditional_expression_t *const cond = &expr->conditional;
4568 expression_has_effect(cond->true_expression) &&
4569 expression_has_effect(cond->false_expression);
4571 case EXPR_SELECT: return false;
4572 case EXPR_ARRAY_ACCESS: return false;
4573 case EXPR_SIZEOF: return false;
4574 case EXPR_CLASSIFY_TYPE: return false;
4575 case EXPR_ALIGNOF: return false;
4577 case EXPR_FUNCTION: return false;
4578 case EXPR_PRETTY_FUNCTION: return false;
4579 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
4580 case EXPR_BUILTIN_CONSTANT_P: return false;
4581 case EXPR_BUILTIN_PREFETCH: return true;
4582 case EXPR_OFFSETOF: return false;
4583 case EXPR_VA_START: return true;
4584 case EXPR_VA_ARG: return true;
4585 case EXPR_STATEMENT: return true; // TODO
4587 case EXPR_UNARY_NEGATE: return false;
4588 case EXPR_UNARY_PLUS: return false;
4589 case EXPR_UNARY_BITWISE_NEGATE: return false;
4590 case EXPR_UNARY_NOT: return false;
4591 case EXPR_UNARY_DEREFERENCE: return false;
4592 case EXPR_UNARY_TAKE_ADDRESS: return false;
4593 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
4594 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
4595 case EXPR_UNARY_PREFIX_INCREMENT: return true;
4596 case EXPR_UNARY_PREFIX_DECREMENT: return true;
4597 case EXPR_UNARY_CAST:
4598 return is_type_atomic(expr->base.datatype, ATOMIC_TYPE_VOID);
4599 case EXPR_UNARY_CAST_IMPLICIT: return true;
4600 case EXPR_UNARY_ASSUME: return true;
4601 case EXPR_UNARY_BITFIELD_EXTRACT: return false;
4603 case EXPR_BINARY_ADD: return false;
4604 case EXPR_BINARY_SUB: return false;
4605 case EXPR_BINARY_MUL: return false;
4606 case EXPR_BINARY_DIV: return false;
4607 case EXPR_BINARY_MOD: return false;
4608 case EXPR_BINARY_EQUAL: return false;
4609 case EXPR_BINARY_NOTEQUAL: return false;
4610 case EXPR_BINARY_LESS: return false;
4611 case EXPR_BINARY_LESSEQUAL: return false;
4612 case EXPR_BINARY_GREATER: return false;
4613 case EXPR_BINARY_GREATEREQUAL: return false;
4614 case EXPR_BINARY_BITWISE_AND: return false;
4615 case EXPR_BINARY_BITWISE_OR: return false;
4616 case EXPR_BINARY_BITWISE_XOR: return false;
4617 case EXPR_BINARY_SHIFTLEFT: return false;
4618 case EXPR_BINARY_SHIFTRIGHT: return false;
4619 case EXPR_BINARY_ASSIGN: return true;
4620 case EXPR_BINARY_MUL_ASSIGN: return true;
4621 case EXPR_BINARY_DIV_ASSIGN: return true;
4622 case EXPR_BINARY_MOD_ASSIGN: return true;
4623 case EXPR_BINARY_ADD_ASSIGN: return true;
4624 case EXPR_BINARY_SUB_ASSIGN: return true;
4625 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
4626 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
4627 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
4628 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
4629 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
4630 case EXPR_BINARY_LOGICAL_AND:
4631 case EXPR_BINARY_LOGICAL_OR:
4632 case EXPR_BINARY_COMMA:
4633 return expression_has_effect(expr->binary.right);
4635 case EXPR_BINARY_BUILTIN_EXPECT: return true;
4636 case EXPR_BINARY_ISGREATER: return false;
4637 case EXPR_BINARY_ISGREATEREQUAL: return false;
4638 case EXPR_BINARY_ISLESS: return false;
4639 case EXPR_BINARY_ISLESSEQUAL: return false;
4640 case EXPR_BINARY_ISLESSGREATER: return false;
4641 case EXPR_BINARY_ISUNORDERED: return false;
4644 panic("unexpected statement");
4647 static void semantic_comma(binary_expression_t *expression)
4649 if (warning.unused_value) {
4650 const expression_t *const left = expression->left;
4651 if (!expression_has_effect(left)) {
4652 warningf(left->base.source_position, "left-hand operand of comma expression has no effect");
4655 expression->expression.datatype = expression->right->base.datatype;
4658 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4659 static expression_t *parse_##binexpression_type(unsigned precedence, \
4660 expression_t *left) \
4663 source_position_t pos = HERE; \
4665 expression_t *right = parse_sub_expression(precedence + lr); \
4667 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4668 binexpr->base.source_position = pos; \
4669 binexpr->binary.left = left; \
4670 binexpr->binary.right = right; \
4671 sfunc(&binexpr->binary); \
4676 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4677 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4678 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4679 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4680 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4681 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4682 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4683 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4684 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4686 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4687 semantic_comparison, 1)
4688 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4689 semantic_comparison, 1)
4690 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4691 semantic_comparison, 1)
4692 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4693 semantic_comparison, 1)
4695 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4696 semantic_binexpr_arithmetic, 1)
4697 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4698 semantic_binexpr_arithmetic, 1)
4699 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4700 semantic_binexpr_arithmetic, 1)
4701 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4702 semantic_logical_op, 1)
4703 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4704 semantic_logical_op, 1)
4705 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4706 semantic_shift_op, 1)
4707 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4708 semantic_shift_op, 1)
4709 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4710 semantic_arithmetic_addsubb_assign, 0)
4711 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4712 semantic_arithmetic_addsubb_assign, 0)
4713 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4714 semantic_arithmetic_assign, 0)
4715 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4716 semantic_arithmetic_assign, 0)
4717 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4718 semantic_arithmetic_assign, 0)
4719 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4720 semantic_arithmetic_assign, 0)
4721 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4722 semantic_arithmetic_assign, 0)
4723 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4724 semantic_arithmetic_assign, 0)
4725 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4726 semantic_arithmetic_assign, 0)
4727 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4728 semantic_arithmetic_assign, 0)
4730 static expression_t *parse_sub_expression(unsigned precedence)
4732 if(token.type < 0) {
4733 return expected_expression_error();
4736 expression_parser_function_t *parser
4737 = &expression_parsers[token.type];
4738 source_position_t source_position = token.source_position;
4741 if(parser->parser != NULL) {
4742 left = parser->parser(parser->precedence);
4744 left = parse_primary_expression();
4746 assert(left != NULL);
4747 left->base.source_position = source_position;
4750 if(token.type < 0) {
4751 return expected_expression_error();
4754 parser = &expression_parsers[token.type];
4755 if(parser->infix_parser == NULL)
4757 if(parser->infix_precedence < precedence)
4760 left = parser->infix_parser(parser->infix_precedence, left);
4762 assert(left != NULL);
4763 assert(left->kind != EXPR_UNKNOWN);
4764 left->base.source_position = source_position;
4771 * Parse an expression.
4773 static expression_t *parse_expression(void)
4775 return parse_sub_expression(1);
4779 * Register a parser for a prefix-like operator with given precedence.
4781 * @param parser the parser function
4782 * @param token_type the token type of the prefix token
4783 * @param precedence the precedence of the operator
4785 static void register_expression_parser(parse_expression_function parser,
4786 int token_type, unsigned precedence)
4788 expression_parser_function_t *entry = &expression_parsers[token_type];
4790 if(entry->parser != NULL) {
4791 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4792 panic("trying to register multiple expression parsers for a token");
4794 entry->parser = parser;
4795 entry->precedence = precedence;
4799 * Register a parser for an infix operator with given precedence.
4801 * @param parser the parser function
4802 * @param token_type the token type of the infix operator
4803 * @param precedence the precedence of the operator
4805 static void register_infix_parser(parse_expression_infix_function parser,
4806 int token_type, unsigned precedence)
4808 expression_parser_function_t *entry = &expression_parsers[token_type];
4810 if(entry->infix_parser != NULL) {
4811 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4812 panic("trying to register multiple infix expression parsers for a "
4815 entry->infix_parser = parser;
4816 entry->infix_precedence = precedence;
4820 * Initialize the expression parsers.
4822 static void init_expression_parsers(void)
4824 memset(&expression_parsers, 0, sizeof(expression_parsers));
4826 register_infix_parser(parse_array_expression, '[', 30);
4827 register_infix_parser(parse_call_expression, '(', 30);
4828 register_infix_parser(parse_select_expression, '.', 30);
4829 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4830 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4832 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4835 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4836 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4837 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4838 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4839 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4840 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4841 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4842 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4843 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4844 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4845 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4846 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4847 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4848 T_EXCLAMATIONMARKEQUAL, 13);
4849 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4850 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4851 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4852 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4853 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4854 register_infix_parser(parse_conditional_expression, '?', 7);
4855 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4856 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4857 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4858 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4859 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4860 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4861 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4862 T_LESSLESSEQUAL, 2);
4863 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4864 T_GREATERGREATEREQUAL, 2);
4865 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4867 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4869 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4872 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4874 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4875 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4876 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4877 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4878 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4879 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4880 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4882 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4884 register_expression_parser(parse_sizeof, T_sizeof, 25);
4885 register_expression_parser(parse_alignof, T___alignof__, 25);
4886 register_expression_parser(parse_extension, T___extension__, 25);
4887 register_expression_parser(parse_builtin_classify_type,
4888 T___builtin_classify_type, 25);
4892 * Parse a asm statement constraints specification.
4894 static asm_constraint_t *parse_asm_constraints(void)
4896 asm_constraint_t *result = NULL;
4897 asm_constraint_t *last = NULL;
4899 while(token.type == T_STRING_LITERAL || token.type == '[') {
4900 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4901 memset(constraint, 0, sizeof(constraint[0]));
4903 if(token.type == '[') {
4905 if(token.type != T_IDENTIFIER) {
4906 parse_error_expected("while parsing asm constraint",
4910 constraint->symbol = token.v.symbol;
4915 constraint->constraints = parse_string_literals();
4917 constraint->expression = parse_expression();
4921 last->next = constraint;
4923 result = constraint;
4927 if(token.type != ',')
4936 * Parse a asm statement clobber specification.
4938 static asm_clobber_t *parse_asm_clobbers(void)
4940 asm_clobber_t *result = NULL;
4941 asm_clobber_t *last = NULL;
4943 while(token.type == T_STRING_LITERAL) {
4944 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4945 clobber->clobber = parse_string_literals();
4948 last->next = clobber;
4954 if(token.type != ',')
4963 * Parse an asm statement.
4965 static statement_t *parse_asm_statement(void)
4969 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4970 statement->base.source_position = token.source_position;
4972 asm_statement_t *asm_statement = &statement->asms;
4974 if(token.type == T_volatile) {
4976 asm_statement->is_volatile = true;
4980 asm_statement->asm_text = parse_string_literals();
4982 if(token.type != ':')
4986 asm_statement->inputs = parse_asm_constraints();
4987 if(token.type != ':')
4991 asm_statement->outputs = parse_asm_constraints();
4992 if(token.type != ':')
4996 asm_statement->clobbers = parse_asm_clobbers();
5005 * Parse a case statement.
5007 static statement_t *parse_case_statement(void)
5011 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
5013 statement->base.source_position = token.source_position;
5014 statement->case_label.expression = parse_expression();
5018 if (! is_constant_expression(statement->case_label.expression)) {
5019 errorf(statement->base.source_position,
5020 "case label does not reduce to an integer constant");
5022 /* TODO: check if the case label is already known */
5023 if (current_switch != NULL) {
5024 /* link all cases into the switch statement */
5025 if (current_switch->last_case == NULL) {
5026 current_switch->first_case =
5027 current_switch->last_case = &statement->case_label;
5029 current_switch->last_case->next = &statement->case_label;
5032 errorf(statement->base.source_position,
5033 "case label not within a switch statement");
5036 statement->case_label.label_statement = parse_statement();
5042 * Finds an existing default label of a switch statement.
5044 static case_label_statement_t *
5045 find_default_label(const switch_statement_t *statement)
5047 for (case_label_statement_t *label = statement->first_case;
5049 label = label->next) {
5050 if (label->expression == NULL)
5057 * Parse a default statement.
5059 static statement_t *parse_default_statement(void)
5063 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
5065 statement->base.source_position = token.source_position;
5068 if (current_switch != NULL) {
5069 const case_label_statement_t *def_label = find_default_label(current_switch);
5070 if (def_label != NULL) {
5071 errorf(HERE, "multiple default labels in one switch");
5072 errorf(def_label->statement.source_position,
5073 "this is the first default label");
5075 /* link all cases into the switch statement */
5076 if (current_switch->last_case == NULL) {
5077 current_switch->first_case =
5078 current_switch->last_case = &statement->case_label;
5080 current_switch->last_case->next = &statement->case_label;
5084 errorf(statement->base.source_position,
5085 "'default' label not within a switch statement");
5087 statement->label.label_statement = parse_statement();
5093 * Return the declaration for a given label symbol or create a new one.
5095 static declaration_t *get_label(symbol_t *symbol)
5097 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
5098 assert(current_function != NULL);
5099 /* if we found a label in the same function, then we already created the
5101 if(candidate != NULL
5102 && candidate->parent_scope == ¤t_function->scope) {
5106 /* otherwise we need to create a new one */
5107 declaration_t *const declaration = allocate_declaration_zero();
5108 declaration->namespc = NAMESPACE_LABEL;
5109 declaration->symbol = symbol;
5111 label_push(declaration);
5117 * Parse a label statement.
5119 static statement_t *parse_label_statement(void)
5121 assert(token.type == T_IDENTIFIER);
5122 symbol_t *symbol = token.v.symbol;
5125 declaration_t *label = get_label(symbol);
5127 /* if source position is already set then the label is defined twice,
5128 * otherwise it was just mentioned in a goto so far */
5129 if(label->source_position.input_name != NULL) {
5130 errorf(HERE, "duplicate label '%Y'", symbol);
5131 errorf(label->source_position, "previous definition of '%Y' was here",
5134 label->source_position = token.source_position;
5137 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
5139 label_statement->statement.kind = STATEMENT_LABEL;
5140 label_statement->statement.source_position = token.source_position;
5141 label_statement->label = label;
5145 if(token.type == '}') {
5146 /* TODO only warn? */
5147 errorf(HERE, "label at end of compound statement");
5148 return (statement_t*) label_statement;
5150 if (token.type == ';') {
5151 /* eat an empty statement here, to avoid the warning about an empty
5152 * after a label. label:; is commonly used to have a label before
5156 label_statement->label_statement = parse_statement();
5160 /* remember the labels's in a list for later checking */
5161 if (label_last == NULL) {
5162 label_first = label_last = label_statement;
5164 label_last->next = label_statement;
5167 return (statement_t*) label_statement;
5171 * Parse an if statement.
5173 static statement_t *parse_if(void)
5177 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5178 statement->statement.kind = STATEMENT_IF;
5179 statement->statement.source_position = token.source_position;
5182 statement->condition = parse_expression();
5185 statement->true_statement = parse_statement();
5186 if(token.type == T_else) {
5188 statement->false_statement = parse_statement();
5191 return (statement_t*) statement;
5195 * Parse a switch statement.
5197 static statement_t *parse_switch(void)
5201 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5202 statement->statement.kind = STATEMENT_SWITCH;
5203 statement->statement.source_position = token.source_position;
5206 expression_t *const expr = parse_expression();
5207 type_t * type = skip_typeref(expr->base.datatype);
5208 if (is_type_integer(type)) {
5209 type = promote_integer(type);
5210 } else if (is_type_valid(type)) {
5211 errorf(expr->base.source_position, "switch quantity is not an integer, but '%T'", type);
5212 type = type_error_type;
5214 statement->expression = create_implicit_cast(expr, type);
5217 switch_statement_t *rem = current_switch;
5218 current_switch = statement;
5219 statement->body = parse_statement();
5220 current_switch = rem;
5222 if (warning.switch_default && find_default_label(statement) == NULL) {
5223 warningf(statement->statement.source_position, "switch has no default case");
5226 return (statement_t*) statement;
5229 static statement_t *parse_loop_body(statement_t *const loop)
5231 statement_t *const rem = current_loop;
5232 current_loop = loop;
5233 statement_t *const body = parse_statement();
5239 * Parse a while statement.
5241 static statement_t *parse_while(void)
5245 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5246 statement->statement.kind = STATEMENT_WHILE;
5247 statement->statement.source_position = token.source_position;
5250 statement->condition = parse_expression();
5253 statement->body = parse_loop_body((statement_t*)statement);
5255 return (statement_t*) statement;
5259 * Parse a do statement.
5261 static statement_t *parse_do(void)
5265 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5266 statement->statement.kind = STATEMENT_DO_WHILE;
5267 statement->statement.source_position = token.source_position;
5269 statement->body = parse_loop_body((statement_t*)statement);
5272 statement->condition = parse_expression();
5276 return (statement_t*) statement;
5280 * Parse a for statement.
5282 static statement_t *parse_for(void)
5286 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5287 statement->statement.kind = STATEMENT_FOR;
5288 statement->statement.source_position = token.source_position;
5292 int top = environment_top();
5293 scope_t *last_scope = scope;
5294 set_scope(&statement->scope);
5296 if(token.type != ';') {
5297 if(is_declaration_specifier(&token, false)) {
5298 parse_declaration(record_declaration);
5300 statement->initialisation = parse_expression();
5307 if(token.type != ';') {
5308 statement->condition = parse_expression();
5311 if(token.type != ')') {
5312 statement->step = parse_expression();
5315 statement->body = parse_loop_body((statement_t*)statement);
5317 assert(scope == &statement->scope);
5318 set_scope(last_scope);
5319 environment_pop_to(top);
5321 return (statement_t*) statement;
5325 * Parse a goto statement.
5327 static statement_t *parse_goto(void)
5331 if(token.type != T_IDENTIFIER) {
5332 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5336 symbol_t *symbol = token.v.symbol;
5339 declaration_t *label = get_label(symbol);
5341 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5343 statement->statement.kind = STATEMENT_GOTO;
5344 statement->statement.source_position = token.source_position;
5346 statement->label = label;
5348 /* remember the goto's in a list for later checking */
5349 if (goto_last == NULL) {
5350 goto_first = goto_last = statement;
5352 goto_last->next = statement;
5357 return (statement_t*) statement;
5361 * Parse a continue statement.
5363 static statement_t *parse_continue(void)
5365 statement_t *statement;
5366 if (current_loop == NULL) {
5367 errorf(HERE, "continue statement not within loop");
5370 statement = allocate_statement_zero(STATEMENT_CONTINUE);
5372 statement->base.source_position = token.source_position;
5382 * Parse a break statement.
5384 static statement_t *parse_break(void)
5386 statement_t *statement;
5387 if (current_switch == NULL && current_loop == NULL) {
5388 errorf(HERE, "break statement not within loop or switch");
5391 statement = allocate_statement_zero(STATEMENT_BREAK);
5393 statement->base.source_position = token.source_position;
5403 * Check if a given declaration represents a local variable.
5405 static bool is_local_var_declaration(const declaration_t *declaration) {
5406 switch ((storage_class_tag_t) declaration->storage_class) {
5407 case STORAGE_CLASS_NONE:
5408 case STORAGE_CLASS_AUTO:
5409 case STORAGE_CLASS_REGISTER: {
5410 const type_t *type = skip_typeref(declaration->type);
5411 if(is_type_function(type)) {
5423 * Check if a given expression represents a local variable.
5425 static bool is_local_variable(const expression_t *expression)
5427 if (expression->base.kind != EXPR_REFERENCE) {
5430 const declaration_t *declaration = expression->reference.declaration;
5431 return is_local_var_declaration(declaration);
5435 * Parse a return statement.
5437 static statement_t *parse_return(void)
5441 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5443 statement->statement.kind = STATEMENT_RETURN;
5444 statement->statement.source_position = token.source_position;
5446 expression_t *return_value = NULL;
5447 if(token.type != ';') {
5448 return_value = parse_expression();
5452 const type_t *const func_type = current_function->type;
5453 assert(is_type_function(func_type));
5454 type_t *const return_type = skip_typeref(func_type->function.return_type);
5456 if(return_value != NULL) {
5457 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5459 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5460 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5461 warningf(statement->statement.source_position,
5462 "'return' with a value, in function returning void");
5463 return_value = NULL;
5465 type_t *const res_type = semantic_assign(return_type,
5466 return_value, "'return'");
5467 if (res_type == NULL) {
5468 errorf(statement->statement.source_position,
5469 "cannot return something of type '%T' in function returning '%T'",
5470 return_value->base.datatype, return_type);
5472 return_value = create_implicit_cast(return_value, res_type);
5475 /* check for returning address of a local var */
5476 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
5477 const expression_t *expression = return_value->unary.value;
5478 if (is_local_variable(expression)) {
5479 warningf(statement->statement.source_position,
5480 "function returns address of local variable");
5484 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5485 warningf(statement->statement.source_position,
5486 "'return' without value, in function returning non-void");
5489 statement->return_value = return_value;
5491 return (statement_t*) statement;
5495 * Parse a declaration statement.
5497 static statement_t *parse_declaration_statement(void)
5499 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5501 statement->base.source_position = token.source_position;
5503 declaration_t *before = last_declaration;
5504 parse_declaration(record_declaration);
5506 if(before == NULL) {
5507 statement->declaration.declarations_begin = scope->declarations;
5509 statement->declaration.declarations_begin = before->next;
5511 statement->declaration.declarations_end = last_declaration;
5517 * Parse an expression statement, ie. expr ';'.
5519 static statement_t *parse_expression_statement(void)
5521 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5523 statement->base.source_position = token.source_position;
5524 expression_t *const expr = parse_expression();
5525 statement->expression.expression = expr;
5527 if (warning.unused_value && !expression_has_effect(expr)) {
5528 warningf(expr->base.source_position, "statement has no effect");
5537 * Parse a statement.
5539 static statement_t *parse_statement(void)
5541 statement_t *statement = NULL;
5543 /* declaration or statement */
5544 switch(token.type) {
5546 statement = parse_asm_statement();
5550 statement = parse_case_statement();
5554 statement = parse_default_statement();
5558 statement = parse_compound_statement();
5562 statement = parse_if();
5566 statement = parse_switch();
5570 statement = parse_while();
5574 statement = parse_do();
5578 statement = parse_for();
5582 statement = parse_goto();
5586 statement = parse_continue();
5590 statement = parse_break();
5594 statement = parse_return();
5598 if (warning.empty_statement) {
5599 warningf(HERE, "statement is empty");
5606 if(look_ahead(1)->type == ':') {
5607 statement = parse_label_statement();
5611 if(is_typedef_symbol(token.v.symbol)) {
5612 statement = parse_declaration_statement();
5616 statement = parse_expression_statement();
5619 case T___extension__:
5620 /* this can be a prefix to a declaration or an expression statement */
5621 /* we simply eat it now and parse the rest with tail recursion */
5624 } while(token.type == T___extension__);
5625 statement = parse_statement();
5629 statement = parse_declaration_statement();
5633 statement = parse_expression_statement();
5637 assert(statement == NULL
5638 || statement->base.source_position.input_name != NULL);
5644 * Parse a compound statement.
5646 static statement_t *parse_compound_statement(void)
5648 compound_statement_t *const compound_statement
5649 = allocate_ast_zero(sizeof(compound_statement[0]));
5650 compound_statement->statement.kind = STATEMENT_COMPOUND;
5651 compound_statement->statement.source_position = token.source_position;
5655 int top = environment_top();
5656 scope_t *last_scope = scope;
5657 set_scope(&compound_statement->scope);
5659 statement_t *last_statement = NULL;
5661 while(token.type != '}' && token.type != T_EOF) {
5662 statement_t *statement = parse_statement();
5663 if(statement == NULL)
5666 if(last_statement != NULL) {
5667 last_statement->base.next = statement;
5669 compound_statement->statements = statement;
5672 while(statement->base.next != NULL)
5673 statement = statement->base.next;
5675 last_statement = statement;
5678 if(token.type == '}') {
5681 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5684 assert(scope == &compound_statement->scope);
5685 set_scope(last_scope);
5686 environment_pop_to(top);
5688 return (statement_t*) compound_statement;
5692 * Initialize builtin types.
5694 static void initialize_builtin_types(void)
5696 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5697 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5698 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5699 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5700 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5701 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5702 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5703 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5705 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5706 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5707 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5708 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5712 * Check for unused global static functions and variables
5714 static void check_unused_globals(void)
5716 if (!warning.unused_function && !warning.unused_variable)
5719 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
5720 if (decl->used || decl->storage_class != STORAGE_CLASS_STATIC)
5723 type_t *const type = decl->type;
5725 if (is_type_function(skip_typeref(type))) {
5726 if (!warning.unused_function || decl->is_inline)
5729 s = (decl->init.statement != NULL ? "defined" : "declared");
5731 if (!warning.unused_variable)
5737 warningf(decl->source_position, "'%#T' %s but not used",
5738 type, decl->symbol, s);
5743 * Parse a translation unit.
5745 static translation_unit_t *parse_translation_unit(void)
5747 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5749 assert(global_scope == NULL);
5750 global_scope = &unit->scope;
5752 assert(scope == NULL);
5753 set_scope(&unit->scope);
5755 initialize_builtin_types();
5757 while(token.type != T_EOF) {
5758 if (token.type == ';') {
5759 /* TODO error in strict mode */
5760 warningf(HERE, "stray ';' outside of function");
5763 parse_external_declaration();
5767 assert(scope == &unit->scope);
5769 last_declaration = NULL;
5771 assert(global_scope == &unit->scope);
5772 check_unused_globals();
5773 global_scope = NULL;
5781 * @return the translation unit or NULL if errors occurred.
5783 translation_unit_t *parse(void)
5785 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5786 label_stack = NEW_ARR_F(stack_entry_t, 0);
5787 diagnostic_count = 0;
5791 type_set_output(stderr);
5792 ast_set_output(stderr);
5794 lookahead_bufpos = 0;
5795 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5798 translation_unit_t *unit = parse_translation_unit();
5800 DEL_ARR_F(environment_stack);
5801 DEL_ARR_F(label_stack);
5810 * Initialize the parser.
5812 void init_parser(void)
5814 init_expression_parsers();
5815 obstack_init(&temp_obst);
5817 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5818 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5822 * Terminate the parser.
5824 void exit_parser(void)
5826 obstack_free(&temp_obst, NULL);