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 context_t *global_context = NULL;
48 static context_t *context = NULL;
49 static declaration_t *last_declaration = NULL;
50 static declaration_t *current_function = NULL;
51 static 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 struct obstack temp_obst;
57 /** The current source position. */
58 #define HERE token.source_position
60 static type_t *type_valist;
62 static statement_t *parse_compound_statement(void);
63 static statement_t *parse_statement(void);
65 static expression_t *parse_sub_expression(unsigned precedence);
66 static expression_t *parse_expression(void);
67 static type_t *parse_typename(void);
69 static void parse_compound_type_entries(void);
70 static declaration_t *parse_declarator(
71 const declaration_specifiers_t *specifiers, bool may_be_abstract);
72 static declaration_t *record_declaration(declaration_t *declaration);
74 static void semantic_comparison(binary_expression_t *expression);
76 #define STORAGE_CLASSES \
83 #define TYPE_QUALIFIERS \
90 #ifdef PROVIDE_COMPLEX
91 #define COMPLEX_SPECIFIERS \
93 #define IMAGINARY_SPECIFIERS \
96 #define COMPLEX_SPECIFIERS
97 #define IMAGINARY_SPECIFIERS
100 #define TYPE_SPECIFIERS \
115 case T___builtin_va_list: \
119 #define DECLARATION_START \
124 #define TYPENAME_START \
129 * Allocate an AST node with given size and
130 * initialize all fields with zero.
132 static void *allocate_ast_zero(size_t size)
134 void *res = allocate_ast(size);
135 memset(res, 0, size);
139 static declaration_t *allocate_declaration_zero(void)
141 declaration_t *declaration = allocate_ast_zero(sizeof(*allocate_declaration_zero()));
142 declaration->type = type_error_type;
147 * Returns the size of a statement node.
149 * @param kind the statement kind
151 static size_t get_statement_struct_size(statement_kind_t kind)
153 static const size_t sizes[] = {
154 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
155 [STATEMENT_RETURN] = sizeof(return_statement_t),
156 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
157 [STATEMENT_IF] = sizeof(if_statement_t),
158 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
159 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
160 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
161 [STATEMENT_BREAK] = sizeof(statement_base_t),
162 [STATEMENT_GOTO] = sizeof(goto_statement_t),
163 [STATEMENT_LABEL] = sizeof(label_statement_t),
164 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
165 [STATEMENT_WHILE] = sizeof(while_statement_t),
166 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
167 [STATEMENT_FOR] = sizeof(for_statement_t),
168 [STATEMENT_ASM] = sizeof(asm_statement_t)
170 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
171 assert(sizes[kind] != 0);
176 * Allocate a statement node of given kind and initialize all
179 static statement_t *allocate_statement_zero(statement_kind_t kind)
181 size_t size = get_statement_struct_size(kind);
182 statement_t *res = allocate_ast_zero(size);
184 res->base.kind = kind;
189 * Returns the size of an expression node.
191 * @param kind the expression kind
193 static size_t get_expression_struct_size(expression_kind_t kind)
195 static const size_t sizes[] = {
196 [EXPR_INVALID] = sizeof(expression_base_t),
197 [EXPR_REFERENCE] = sizeof(reference_expression_t),
198 [EXPR_CONST] = sizeof(const_expression_t),
199 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
200 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
201 [EXPR_CALL] = sizeof(call_expression_t),
202 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
203 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
204 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
205 [EXPR_SELECT] = sizeof(select_expression_t),
206 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
207 [EXPR_SIZEOF] = sizeof(sizeof_expression_t),
208 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
209 [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
210 [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
211 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
212 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
213 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
214 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
215 [EXPR_VA_START] = sizeof(va_start_expression_t),
216 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
217 [EXPR_STATEMENT] = sizeof(statement_expression_t),
219 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
220 return sizes[EXPR_UNARY_FIRST];
222 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
223 return sizes[EXPR_BINARY_FIRST];
225 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
226 assert(sizes[kind] != 0);
231 * Allocate an expression node of given kind and initialize all
234 static expression_t *allocate_expression_zero(expression_kind_t kind)
236 size_t size = get_expression_struct_size(kind);
237 expression_t *res = allocate_ast_zero(size);
239 res->base.kind = kind;
240 res->base.datatype = type_error_type;
245 * Returns the size of a type node.
247 * @param kind the type kind
249 static size_t get_type_struct_size(type_kind_t kind)
251 static const size_t sizes[] = {
252 [TYPE_ATOMIC] = sizeof(atomic_type_t),
253 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
254 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
255 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
256 [TYPE_ENUM] = sizeof(enum_type_t),
257 [TYPE_FUNCTION] = sizeof(function_type_t),
258 [TYPE_POINTER] = sizeof(pointer_type_t),
259 [TYPE_ARRAY] = sizeof(array_type_t),
260 [TYPE_BUILTIN] = sizeof(builtin_type_t),
261 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
262 [TYPE_TYPEOF] = sizeof(typeof_type_t),
264 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
265 assert(kind <= TYPE_TYPEOF);
266 assert(sizes[kind] != 0);
271 * Allocate a type node of given kind and initialize all
274 static type_t *allocate_type_zero(type_kind_t kind)
276 size_t size = get_type_struct_size(kind);
277 type_t *res = obstack_alloc(type_obst, size);
278 memset(res, 0, size);
280 res->base.kind = kind;
285 * Returns the size of an initializer node.
287 * @param kind the initializer kind
289 static size_t get_initializer_size(initializer_kind_t kind)
291 static const size_t sizes[] = {
292 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
293 [INITIALIZER_STRING] = sizeof(initializer_string_t),
294 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
295 [INITIALIZER_LIST] = sizeof(initializer_list_t)
297 assert(kind < sizeof(sizes) / sizeof(*sizes));
298 assert(sizes[kind] != 0);
303 * Allocate an initializer node of given kind and initialize all
306 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
308 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
315 * Free a type from the type obstack.
317 static void free_type(void *type)
319 obstack_free(type_obst, type);
323 * Returns the index of the top element of the environment stack.
325 static size_t environment_top(void)
327 return ARR_LEN(environment_stack);
331 * Returns the index of the top element of the label stack.
333 static size_t label_top(void)
335 return ARR_LEN(label_stack);
340 * Return the next token.
342 static inline void next_token(void)
344 token = lookahead_buffer[lookahead_bufpos];
345 lookahead_buffer[lookahead_bufpos] = lexer_token;
348 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
351 print_token(stderr, &token);
352 fprintf(stderr, "\n");
357 * Return the next token with a given lookahead.
359 static inline const token_t *look_ahead(int num)
361 assert(num > 0 && num <= MAX_LOOKAHEAD);
362 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
363 return &lookahead_buffer[pos];
366 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
369 * Report a parse error because an expected token was not found.
371 static void parse_error_expected(const char *message, ...)
373 if(message != NULL) {
374 errorf(HERE, "%s", message);
377 va_start(ap, message);
378 errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
383 * Report a type error.
385 static void type_error(const char *msg, const source_position_t source_position,
388 errorf(source_position, "%s, but found type '%T'", msg, type);
392 * Report an incompatible type.
394 static void type_error_incompatible(const char *msg,
395 const source_position_t source_position, type_t *type1, type_t *type2)
397 errorf(source_position, "%s, incompatible types: '%T' - '%T'", msg, type1, type2);
401 * Eat an complete block, ie. '{ ... }'.
403 static void eat_block(void)
405 if(token.type == '{')
408 while(token.type != '}') {
409 if(token.type == T_EOF)
411 if(token.type == '{') {
421 * Eat a statement until an ';' token.
423 static void eat_statement(void)
425 while(token.type != ';') {
426 if(token.type == T_EOF)
428 if(token.type == '}')
430 if(token.type == '{') {
440 * Eat a parenthesed term, ie. '( ... )'.
442 static void eat_paren(void)
444 if(token.type == '(')
447 while(token.type != ')') {
448 if(token.type == T_EOF)
450 if(token.type == ')' || token.type == ';' || token.type == '}') {
453 if(token.type == '(') {
457 if(token.type == '{') {
466 #define expect(expected) \
467 if(UNLIKELY(token.type != (expected))) { \
468 parse_error_expected(NULL, (expected), 0); \
474 #define expect_block(expected) \
475 if(UNLIKELY(token.type != (expected))) { \
476 parse_error_expected(NULL, (expected), 0); \
482 #define expect_void(expected) \
483 if(UNLIKELY(token.type != (expected))) { \
484 parse_error_expected(NULL, (expected), 0); \
490 static void set_context(context_t *new_context)
492 context = new_context;
494 last_declaration = new_context->declarations;
495 if(last_declaration != NULL) {
496 while(last_declaration->next != NULL) {
497 last_declaration = last_declaration->next;
503 * Search a symbol in a given namespace and returns its declaration or
504 * NULL if this symbol was not found.
506 static declaration_t *get_declaration(const symbol_t *const symbol, const namespace_t namespc)
508 declaration_t *declaration = symbol->declaration;
509 for( ; declaration != NULL; declaration = declaration->symbol_next) {
510 if(declaration->namespc == namespc)
518 * pushs an environment_entry on the environment stack and links the
519 * corresponding symbol to the new entry
521 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
523 symbol_t *symbol = declaration->symbol;
524 namespace_t namespc = (namespace_t)declaration->namespc;
526 /* remember old declaration */
528 entry.symbol = symbol;
529 entry.old_declaration = symbol->declaration;
530 entry.namespc = (unsigned short) namespc;
531 ARR_APP1(stack_entry_t, *stack_ptr, entry);
533 /* replace/add declaration into declaration list of the symbol */
534 if(symbol->declaration == NULL) {
535 symbol->declaration = declaration;
537 declaration_t *iter_last = NULL;
538 declaration_t *iter = symbol->declaration;
539 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
540 /* replace an entry? */
541 if(iter->namespc == namespc) {
542 if(iter_last == NULL) {
543 symbol->declaration = declaration;
545 iter_last->symbol_next = declaration;
547 declaration->symbol_next = iter->symbol_next;
552 assert(iter_last->symbol_next == NULL);
553 iter_last->symbol_next = declaration;
558 static void environment_push(declaration_t *declaration)
560 assert(declaration->source_position.input_name != NULL);
561 assert(declaration->parent_context != NULL);
562 stack_push(&environment_stack, declaration);
565 static void label_push(declaration_t *declaration)
567 declaration->parent_context = ¤t_function->context;
568 stack_push(&label_stack, declaration);
572 * pops symbols from the environment stack until @p new_top is the top element
574 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
576 stack_entry_t *stack = *stack_ptr;
577 size_t top = ARR_LEN(stack);
580 assert(new_top <= top);
584 for(i = top; i > new_top; --i) {
585 stack_entry_t *entry = &stack[i - 1];
587 declaration_t *old_declaration = entry->old_declaration;
588 symbol_t *symbol = entry->symbol;
589 namespace_t namespc = (namespace_t)entry->namespc;
591 /* replace/remove declaration */
592 declaration_t *declaration = symbol->declaration;
593 assert(declaration != NULL);
594 if(declaration->namespc == namespc) {
595 if(old_declaration == NULL) {
596 symbol->declaration = declaration->symbol_next;
598 symbol->declaration = old_declaration;
601 declaration_t *iter_last = declaration;
602 declaration_t *iter = declaration->symbol_next;
603 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
604 /* replace an entry? */
605 if(iter->namespc == namespc) {
606 assert(iter_last != NULL);
607 iter_last->symbol_next = old_declaration;
608 old_declaration->symbol_next = iter->symbol_next;
612 assert(iter != NULL);
616 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
619 static void environment_pop_to(size_t new_top)
621 stack_pop_to(&environment_stack, new_top);
624 static void label_pop_to(size_t new_top)
626 stack_pop_to(&label_stack, new_top);
630 static int get_rank(const type_t *type)
632 assert(!is_typeref(type));
633 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
634 * and esp. footnote 108). However we can't fold constants (yet), so we
635 * can't decide whether unsigned int is possible, while int always works.
636 * (unsigned int would be preferable when possible... for stuff like
637 * struct { enum { ... } bla : 4; } ) */
638 if(type->kind == TYPE_ENUM)
639 return ATOMIC_TYPE_INT;
641 assert(type->kind == TYPE_ATOMIC);
642 return type->atomic.akind;
645 static type_t *promote_integer(type_t *type)
647 if(type->kind == TYPE_BITFIELD)
648 type = type->bitfield.base;
650 if(get_rank(type) < ATOMIC_TYPE_INT)
657 * Create a cast expression.
659 * @param expression the expression to cast
660 * @param dest_type the destination type
662 static expression_t *create_cast_expression(expression_t *expression,
665 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
667 cast->unary.value = expression;
668 cast->base.datatype = dest_type;
674 * Check if a given expression represents the 0 pointer constant.
676 static bool is_null_pointer_constant(const expression_t *expression)
678 /* skip void* cast */
679 if(expression->kind == EXPR_UNARY_CAST
680 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
681 expression = expression->unary.value;
684 /* TODO: not correct yet, should be any constant integer expression
685 * which evaluates to 0 */
686 if (expression->kind != EXPR_CONST)
689 type_t *const type = skip_typeref(expression->base.datatype);
690 if (!is_type_integer(type))
693 return expression->conste.v.int_value == 0;
697 * Create an implicit cast expression.
699 * @param expression the expression to cast
700 * @param dest_type the destination type
702 static expression_t *create_implicit_cast(expression_t *expression,
705 type_t *const source_type = expression->base.datatype;
707 if (source_type == dest_type)
710 return create_cast_expression(expression, dest_type);
713 /** Implements the rules from § 6.5.16.1 */
714 static type_t *semantic_assign(type_t *orig_type_left,
715 const expression_t *const right,
718 type_t *const orig_type_right = right->base.datatype;
719 type_t *const type_left = skip_typeref(orig_type_left);
720 type_t *const type_right = skip_typeref(orig_type_right);
722 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
723 (is_type_pointer(type_left) && is_null_pointer_constant(right)) ||
724 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
725 && is_type_pointer(type_right))) {
726 return orig_type_left;
729 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
730 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
731 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
733 /* the left type has all qualifiers from the right type */
734 unsigned missing_qualifiers
735 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
736 if(missing_qualifiers != 0) {
737 errorf(HERE, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
738 return orig_type_left;
741 points_to_left = get_unqualified_type(points_to_left);
742 points_to_right = get_unqualified_type(points_to_right);
744 if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
745 && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
746 && !types_compatible(points_to_left, points_to_right)) {
750 return orig_type_left;
753 if (is_type_compound(type_left) && is_type_compound(type_right)) {
754 type_t *const unqual_type_left = get_unqualified_type(type_left);
755 type_t *const unqual_type_right = get_unqualified_type(type_right);
756 if (types_compatible(unqual_type_left, unqual_type_right)) {
757 return orig_type_left;
761 if (!is_type_valid(type_left))
764 if (!is_type_valid(type_right))
765 return orig_type_right;
770 static expression_t *parse_constant_expression(void)
772 /* start parsing at precedence 7 (conditional expression) */
773 expression_t *result = parse_sub_expression(7);
775 if(!is_constant_expression(result)) {
776 errorf(result->base.source_position, "expression '%E' is not constant\n", result);
782 static expression_t *parse_assignment_expression(void)
784 /* start parsing at precedence 2 (assignment expression) */
785 return parse_sub_expression(2);
788 static type_t *make_global_typedef(const char *name, type_t *type)
790 symbol_t *const symbol = symbol_table_insert(name);
792 declaration_t *const declaration = allocate_declaration_zero();
793 declaration->namespc = NAMESPACE_NORMAL;
794 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
795 declaration->type = type;
796 declaration->symbol = symbol;
797 declaration->source_position = builtin_source_position;
799 record_declaration(declaration);
801 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF);
802 typedef_type->typedeft.declaration = declaration;
807 static string_t parse_string_literals(void)
809 assert(token.type == T_STRING_LITERAL);
810 string_t result = token.v.string;
814 while (token.type == T_STRING_LITERAL) {
815 result = concat_strings(&result, &token.v.string);
822 static void parse_attributes(void)
826 case T___attribute__: {
834 errorf(HERE, "EOF while parsing attribute");
853 if(token.type != T_STRING_LITERAL) {
854 parse_error_expected("while parsing assembler attribute",
859 parse_string_literals();
864 goto attributes_finished;
873 static designator_t *parse_designation(void)
875 if(token.type != '[' && token.type != '.')
878 designator_t *result = NULL;
879 designator_t *last = NULL;
882 designator_t *designator;
885 designator = allocate_ast_zero(sizeof(designator[0]));
887 designator->array_access = parse_constant_expression();
891 designator = allocate_ast_zero(sizeof(designator[0]));
893 if(token.type != T_IDENTIFIER) {
894 parse_error_expected("while parsing designator",
898 designator->symbol = token.v.symbol;
906 assert(designator != NULL);
908 last->next = designator;
917 static initializer_t *initializer_from_string(array_type_t *type,
918 const string_t *const string)
920 /* TODO: check len vs. size of array type */
923 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
924 initializer->string.string = *string;
929 static initializer_t *initializer_from_wide_string(array_type_t *const type,
930 wide_string_t *const string)
932 /* TODO: check len vs. size of array type */
935 initializer_t *const initializer =
936 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
937 initializer->wide_string.string = *string;
942 static initializer_t *initializer_from_expression(type_t *type,
943 expression_t *expression)
945 /* TODO check that expression is a constant expression */
947 /* § 6.7.8.14/15 char array may be initialized by string literals */
948 type_t *const expr_type = expression->base.datatype;
949 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
950 array_type_t *const array_type = &type->array;
951 type_t *const element_type = skip_typeref(array_type->element_type);
953 if (element_type->kind == TYPE_ATOMIC) {
954 switch (expression->kind) {
955 case EXPR_STRING_LITERAL:
956 if (element_type->atomic.akind == ATOMIC_TYPE_CHAR) {
957 return initializer_from_string(array_type,
958 &expression->string.value);
961 case EXPR_WIDE_STRING_LITERAL: {
962 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
963 if (get_unqualified_type(element_type) == bare_wchar_type) {
964 return initializer_from_wide_string(array_type,
965 &expression->wide_string.value);
975 type_t *const res_type = semantic_assign(type, expression, "initializer");
976 if (res_type == NULL)
979 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
980 result->value.value = create_implicit_cast(expression, res_type);
985 static initializer_t *parse_sub_initializer(type_t *type,
986 expression_t *expression,
987 type_t *expression_type);
989 static initializer_t *parse_sub_initializer_elem(type_t *type)
991 if(token.type == '{') {
992 return parse_sub_initializer(type, NULL, NULL);
995 expression_t *expression = parse_assignment_expression();
996 type_t *expression_type = skip_typeref(expression->base.datatype);
998 return parse_sub_initializer(type, expression, expression_type);
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,
1023 type_t *expression_type)
1025 if(is_type_scalar(type)) {
1026 /* there might be extra {} hierarchies */
1027 if(token.type == '{') {
1029 if(!had_initializer_brace_warning) {
1030 warningf(HERE, "braces around scalar initializer");
1031 had_initializer_brace_warning = true;
1033 initializer_t *result = parse_sub_initializer(type, NULL, NULL);
1034 if(token.type == ',') {
1036 /* TODO: warn about excessive elements */
1042 if(expression == NULL) {
1043 expression = parse_assignment_expression();
1045 return initializer_from_expression(type, expression);
1048 /* does the expression match the currently looked at object to initialize */
1049 if(expression != NULL) {
1050 initializer_t *result = initializer_from_expression(type, expression);
1055 bool read_paren = false;
1056 if(token.type == '{') {
1061 /* descend into subtype */
1062 initializer_t *result = NULL;
1063 initializer_t **elems;
1064 if(is_type_array(type)) {
1065 if(token.type == '.') {
1067 "compound designator in initializer for array type '%T'",
1072 type_t *const element_type = skip_typeref(type->array.element_type);
1075 had_initializer_brace_warning = false;
1076 if(expression == NULL) {
1077 sub = parse_sub_initializer_elem(element_type);
1079 sub = parse_sub_initializer(element_type, expression,
1083 /* didn't match the subtypes -> try the parent type */
1085 assert(!read_paren);
1089 elems = NEW_ARR_F(initializer_t*, 0);
1090 ARR_APP1(initializer_t*, elems, sub);
1093 if(token.type == '}')
1096 if(token.type == '}')
1099 sub = parse_sub_initializer_elem(element_type);
1101 /* TODO error, do nicer cleanup */
1102 errorf(HERE, "member initializer didn't match");
1106 ARR_APP1(initializer_t*, elems, sub);
1109 assert(is_type_compound(type));
1110 context_t *const context = &type->compound.declaration->context;
1112 if(token.type == '[') {
1114 "array designator in initializer for compound type '%T'",
1119 declaration_t *first = context->declarations;
1122 type_t *first_type = first->type;
1123 first_type = skip_typeref(first_type);
1126 had_initializer_brace_warning = false;
1127 if(expression == NULL) {
1128 sub = parse_sub_initializer_elem(first_type);
1130 sub = parse_sub_initializer(first_type, expression,expression_type);
1133 /* didn't match the subtypes -> try our parent type */
1135 assert(!read_paren);
1139 elems = NEW_ARR_F(initializer_t*, 0);
1140 ARR_APP1(initializer_t*, elems, sub);
1142 declaration_t *iter = first->next;
1143 for( ; iter != NULL; iter = iter->next) {
1144 if(iter->symbol == NULL)
1146 if(iter->namespc != NAMESPACE_NORMAL)
1149 if(token.type == '}')
1152 if(token.type == '}')
1155 type_t *iter_type = iter->type;
1156 iter_type = skip_typeref(iter_type);
1158 sub = parse_sub_initializer_elem(iter_type);
1160 /* TODO error, do nicer cleanup */
1161 errorf(HERE, "member initializer didn't match");
1165 ARR_APP1(initializer_t*, elems, sub);
1169 int len = ARR_LEN(elems);
1170 size_t elems_size = sizeof(initializer_t*) * len;
1172 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1174 init->initializer.kind = INITIALIZER_LIST;
1176 memcpy(init->initializers, elems, elems_size);
1179 result = (initializer_t*) init;
1182 if(token.type == ',')
1189 static initializer_t *parse_initializer(type_t *const orig_type)
1191 initializer_t *result;
1193 type_t *const type = skip_typeref(orig_type);
1195 if(token.type != '{') {
1196 expression_t *expression = parse_assignment_expression();
1197 initializer_t *initializer = initializer_from_expression(type, expression);
1198 if(initializer == NULL) {
1200 "initializer expression '%E' of type '%T' is incompatible with type '%T'",
1201 expression, expression->base.datatype, orig_type);
1206 if(is_type_scalar(type)) {
1210 expression_t *expression = parse_assignment_expression();
1211 result = initializer_from_expression(type, expression);
1213 if(token.type == ',')
1219 result = parse_sub_initializer(type, NULL, NULL);
1225 static declaration_t *append_declaration(declaration_t *declaration);
1227 static declaration_t *parse_compound_type_specifier(bool is_struct)
1235 symbol_t *symbol = NULL;
1236 declaration_t *declaration = NULL;
1238 if (token.type == T___attribute__) {
1243 if(token.type == T_IDENTIFIER) {
1244 symbol = token.v.symbol;
1248 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1250 declaration = get_declaration(symbol, NAMESPACE_UNION);
1252 } else if(token.type != '{') {
1254 parse_error_expected("while parsing struct type specifier",
1255 T_IDENTIFIER, '{', 0);
1257 parse_error_expected("while parsing union type specifier",
1258 T_IDENTIFIER, '{', 0);
1264 if(declaration == NULL) {
1265 declaration = allocate_declaration_zero();
1266 declaration->namespc =
1267 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
1268 declaration->source_position = token.source_position;
1269 declaration->symbol = symbol;
1270 declaration->parent_context = context;
1271 if (symbol != NULL) {
1272 environment_push(declaration);
1274 append_declaration(declaration);
1277 if(token.type == '{') {
1278 if(declaration->init.is_defined) {
1279 assert(symbol != NULL);
1280 errorf(HERE, "multiple definition of '%s %Y'",
1281 is_struct ? "struct" : "union", symbol);
1282 declaration->context.declarations = NULL;
1284 declaration->init.is_defined = true;
1286 int top = environment_top();
1287 context_t *last_context = context;
1288 set_context(&declaration->context);
1290 parse_compound_type_entries();
1293 assert(context == &declaration->context);
1294 set_context(last_context);
1295 environment_pop_to(top);
1301 static void parse_enum_entries(type_t *const enum_type)
1305 if(token.type == '}') {
1307 errorf(HERE, "empty enum not allowed");
1312 if(token.type != T_IDENTIFIER) {
1313 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1318 declaration_t *const entry = allocate_declaration_zero();
1319 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1320 entry->type = enum_type;
1321 entry->symbol = token.v.symbol;
1322 entry->source_position = token.source_position;
1325 if(token.type == '=') {
1327 entry->init.enum_value = parse_constant_expression();
1332 record_declaration(entry);
1334 if(token.type != ',')
1337 } while(token.type != '}');
1342 static type_t *parse_enum_specifier(void)
1346 declaration_t *declaration;
1349 if(token.type == T_IDENTIFIER) {
1350 symbol = token.v.symbol;
1353 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1354 } else if(token.type != '{') {
1355 parse_error_expected("while parsing enum type specifier",
1356 T_IDENTIFIER, '{', 0);
1363 if(declaration == NULL) {
1364 declaration = allocate_declaration_zero();
1365 declaration->namespc = NAMESPACE_ENUM;
1366 declaration->source_position = token.source_position;
1367 declaration->symbol = symbol;
1368 declaration->parent_context = context;
1371 type_t *const type = allocate_type_zero(TYPE_ENUM);
1372 type->enumt.declaration = declaration;
1374 if(token.type == '{') {
1375 if(declaration->init.is_defined) {
1376 errorf(HERE, "multiple definitions of enum %Y", symbol);
1378 if (symbol != NULL) {
1379 environment_push(declaration);
1381 append_declaration(declaration);
1382 declaration->init.is_defined = 1;
1384 parse_enum_entries(type);
1392 * if a symbol is a typedef to another type, return true
1394 static bool is_typedef_symbol(symbol_t *symbol)
1396 const declaration_t *const declaration =
1397 get_declaration(symbol, NAMESPACE_NORMAL);
1399 declaration != NULL &&
1400 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1403 static type_t *parse_typeof(void)
1411 expression_t *expression = NULL;
1414 switch(token.type) {
1415 case T___extension__:
1416 /* this can be a prefix to a typename or an expression */
1417 /* we simply eat it now. */
1420 } while(token.type == T___extension__);
1424 if(is_typedef_symbol(token.v.symbol)) {
1425 type = parse_typename();
1427 expression = parse_expression();
1428 type = expression->base.datatype;
1433 type = parse_typename();
1437 expression = parse_expression();
1438 type = expression->base.datatype;
1444 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1445 typeof_type->typeoft.expression = expression;
1446 typeof_type->typeoft.typeof_type = type;
1452 SPECIFIER_SIGNED = 1 << 0,
1453 SPECIFIER_UNSIGNED = 1 << 1,
1454 SPECIFIER_LONG = 1 << 2,
1455 SPECIFIER_INT = 1 << 3,
1456 SPECIFIER_DOUBLE = 1 << 4,
1457 SPECIFIER_CHAR = 1 << 5,
1458 SPECIFIER_SHORT = 1 << 6,
1459 SPECIFIER_LONG_LONG = 1 << 7,
1460 SPECIFIER_FLOAT = 1 << 8,
1461 SPECIFIER_BOOL = 1 << 9,
1462 SPECIFIER_VOID = 1 << 10,
1463 #ifdef PROVIDE_COMPLEX
1464 SPECIFIER_COMPLEX = 1 << 11,
1465 SPECIFIER_IMAGINARY = 1 << 12,
1469 static type_t *create_builtin_type(symbol_t *const symbol,
1470 type_t *const real_type)
1472 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1473 type->builtin.symbol = symbol;
1474 type->builtin.real_type = real_type;
1476 type_t *result = typehash_insert(type);
1477 if (type != result) {
1484 static type_t *get_typedef_type(symbol_t *symbol)
1486 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1487 if(declaration == NULL
1488 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1491 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1492 type->typedeft.declaration = declaration;
1497 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1499 type_t *type = NULL;
1500 unsigned type_qualifiers = 0;
1501 unsigned type_specifiers = 0;
1504 specifiers->source_position = token.source_position;
1507 switch(token.type) {
1510 #define MATCH_STORAGE_CLASS(token, class) \
1512 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1513 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1515 specifiers->storage_class = class; \
1519 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1520 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1521 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1522 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1523 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1526 switch (specifiers->storage_class) {
1527 case STORAGE_CLASS_NONE:
1528 specifiers->storage_class = STORAGE_CLASS_THREAD;
1531 case STORAGE_CLASS_EXTERN:
1532 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1535 case STORAGE_CLASS_STATIC:
1536 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1540 errorf(HERE, "multiple storage classes in declaration specifiers");
1546 /* type qualifiers */
1547 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1549 type_qualifiers |= qualifier; \
1553 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1554 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1555 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1557 case T___extension__:
1562 /* type specifiers */
1563 #define MATCH_SPECIFIER(token, specifier, name) \
1566 if(type_specifiers & specifier) { \
1567 errorf(HERE, "multiple " name " type specifiers given"); \
1569 type_specifiers |= specifier; \
1573 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1574 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1575 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1576 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1577 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1578 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1579 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1580 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1581 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1582 #ifdef PROVIDE_COMPLEX
1583 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1584 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1587 /* only in microsoft mode */
1588 specifiers->decl_modifiers |= DM_FORCEINLINE;
1592 specifiers->is_inline = true;
1597 if(type_specifiers & SPECIFIER_LONG_LONG) {
1598 errorf(HERE, "multiple type specifiers given");
1599 } else if(type_specifiers & SPECIFIER_LONG) {
1600 type_specifiers |= SPECIFIER_LONG_LONG;
1602 type_specifiers |= SPECIFIER_LONG;
1606 /* TODO: if is_type_valid(type) for the following rules should issue
1609 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1611 type->compound.declaration = parse_compound_type_specifier(true);
1615 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1617 type->compound.declaration = parse_compound_type_specifier(false);
1621 type = parse_enum_specifier();
1624 type = parse_typeof();
1626 case T___builtin_va_list:
1627 type = duplicate_type(type_valist);
1631 case T___attribute__:
1636 case T_IDENTIFIER: {
1637 type_t *typedef_type = get_typedef_type(token.v.symbol);
1639 if(typedef_type == NULL)
1640 goto finish_specifiers;
1643 type = typedef_type;
1647 /* function specifier */
1649 goto finish_specifiers;
1656 atomic_type_kind_t atomic_type;
1658 /* match valid basic types */
1659 switch(type_specifiers) {
1660 case SPECIFIER_VOID:
1661 atomic_type = ATOMIC_TYPE_VOID;
1663 case SPECIFIER_CHAR:
1664 atomic_type = ATOMIC_TYPE_CHAR;
1666 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1667 atomic_type = ATOMIC_TYPE_SCHAR;
1669 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1670 atomic_type = ATOMIC_TYPE_UCHAR;
1672 case SPECIFIER_SHORT:
1673 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1674 case SPECIFIER_SHORT | SPECIFIER_INT:
1675 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1676 atomic_type = ATOMIC_TYPE_SHORT;
1678 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1679 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1680 atomic_type = ATOMIC_TYPE_USHORT;
1683 case SPECIFIER_SIGNED:
1684 case SPECIFIER_SIGNED | SPECIFIER_INT:
1685 atomic_type = ATOMIC_TYPE_INT;
1687 case SPECIFIER_UNSIGNED:
1688 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1689 atomic_type = ATOMIC_TYPE_UINT;
1691 case SPECIFIER_LONG:
1692 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1693 case SPECIFIER_LONG | SPECIFIER_INT:
1694 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1695 atomic_type = ATOMIC_TYPE_LONG;
1697 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1698 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1699 atomic_type = ATOMIC_TYPE_ULONG;
1701 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1702 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1703 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1704 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1706 atomic_type = ATOMIC_TYPE_LONGLONG;
1708 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1709 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1711 atomic_type = ATOMIC_TYPE_ULONGLONG;
1713 case SPECIFIER_FLOAT:
1714 atomic_type = ATOMIC_TYPE_FLOAT;
1716 case SPECIFIER_DOUBLE:
1717 atomic_type = ATOMIC_TYPE_DOUBLE;
1719 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1720 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1722 case SPECIFIER_BOOL:
1723 atomic_type = ATOMIC_TYPE_BOOL;
1725 #ifdef PROVIDE_COMPLEX
1726 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1727 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1729 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1730 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1732 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1733 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1735 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1736 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1738 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1739 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1741 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1742 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1746 /* invalid specifier combination, give an error message */
1747 if(type_specifiers == 0) {
1748 if (! strict_mode) {
1749 if (warning.implicit_int) {
1750 warningf(HERE, "no type specifiers in declaration, using 'int'");
1752 atomic_type = ATOMIC_TYPE_INT;
1755 errorf(HERE, "no type specifiers given in declaration");
1757 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1758 (type_specifiers & SPECIFIER_UNSIGNED)) {
1759 errorf(HERE, "signed and unsigned specifiers gives");
1760 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1761 errorf(HERE, "only integer types can be signed or unsigned");
1763 errorf(HERE, "multiple datatypes in declaration");
1765 atomic_type = ATOMIC_TYPE_INVALID;
1768 type = allocate_type_zero(TYPE_ATOMIC);
1769 type->atomic.akind = atomic_type;
1772 if(type_specifiers != 0) {
1773 errorf(HERE, "multiple datatypes in declaration");
1777 type->base.qualifiers = type_qualifiers;
1779 type_t *result = typehash_insert(type);
1780 if(newtype && result != type) {
1784 specifiers->type = result;
1787 static type_qualifiers_t parse_type_qualifiers(void)
1789 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1792 switch(token.type) {
1793 /* type qualifiers */
1794 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1795 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1796 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1799 return type_qualifiers;
1804 static declaration_t *parse_identifier_list(void)
1806 declaration_t *declarations = NULL;
1807 declaration_t *last_declaration = NULL;
1809 declaration_t *const declaration = allocate_declaration_zero();
1810 declaration->source_position = token.source_position;
1811 declaration->symbol = token.v.symbol;
1814 if(last_declaration != NULL) {
1815 last_declaration->next = declaration;
1817 declarations = declaration;
1819 last_declaration = declaration;
1821 if(token.type != ',')
1824 } while(token.type == T_IDENTIFIER);
1826 return declarations;
1829 static void semantic_parameter(declaration_t *declaration)
1831 /* TODO: improve error messages */
1833 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1834 errorf(HERE, "typedef not allowed in parameter list");
1835 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1836 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1837 errorf(HERE, "parameter may only have none or register storage class");
1840 type_t *const orig_type = declaration->type;
1841 type_t * type = skip_typeref(orig_type);
1843 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1844 * into a pointer. § 6.7.5.3 (7) */
1845 if (is_type_array(type)) {
1846 type_t *const element_type = type->array.element_type;
1848 type = make_pointer_type(element_type, type->base.qualifiers);
1850 declaration->type = type;
1853 if(is_type_incomplete(type)) {
1854 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1855 orig_type, declaration->symbol);
1859 static declaration_t *parse_parameter(void)
1861 declaration_specifiers_t specifiers;
1862 memset(&specifiers, 0, sizeof(specifiers));
1864 parse_declaration_specifiers(&specifiers);
1866 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1868 semantic_parameter(declaration);
1873 static declaration_t *parse_parameters(function_type_t *type)
1875 if(token.type == T_IDENTIFIER) {
1876 symbol_t *symbol = token.v.symbol;
1877 if(!is_typedef_symbol(symbol)) {
1878 type->kr_style_parameters = true;
1879 return parse_identifier_list();
1883 if(token.type == ')') {
1884 type->unspecified_parameters = 1;
1887 if(token.type == T_void && look_ahead(1)->type == ')') {
1892 declaration_t *declarations = NULL;
1893 declaration_t *declaration;
1894 declaration_t *last_declaration = NULL;
1895 function_parameter_t *parameter;
1896 function_parameter_t *last_parameter = NULL;
1899 switch(token.type) {
1903 return declarations;
1906 case T___extension__:
1908 declaration = parse_parameter();
1910 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1911 memset(parameter, 0, sizeof(parameter[0]));
1912 parameter->type = declaration->type;
1914 if(last_parameter != NULL) {
1915 last_declaration->next = declaration;
1916 last_parameter->next = parameter;
1918 type->parameters = parameter;
1919 declarations = declaration;
1921 last_parameter = parameter;
1922 last_declaration = declaration;
1926 return declarations;
1928 if(token.type != ',')
1929 return declarations;
1939 } construct_type_type_t;
1941 typedef struct construct_type_t construct_type_t;
1942 struct construct_type_t {
1943 construct_type_type_t type;
1944 construct_type_t *next;
1947 typedef struct parsed_pointer_t parsed_pointer_t;
1948 struct parsed_pointer_t {
1949 construct_type_t construct_type;
1950 type_qualifiers_t type_qualifiers;
1953 typedef struct construct_function_type_t construct_function_type_t;
1954 struct construct_function_type_t {
1955 construct_type_t construct_type;
1956 type_t *function_type;
1959 typedef struct parsed_array_t parsed_array_t;
1960 struct parsed_array_t {
1961 construct_type_t construct_type;
1962 type_qualifiers_t type_qualifiers;
1968 typedef struct construct_base_type_t construct_base_type_t;
1969 struct construct_base_type_t {
1970 construct_type_t construct_type;
1974 static construct_type_t *parse_pointer_declarator(void)
1978 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
1979 memset(pointer, 0, sizeof(pointer[0]));
1980 pointer->construct_type.type = CONSTRUCT_POINTER;
1981 pointer->type_qualifiers = parse_type_qualifiers();
1983 return (construct_type_t*) pointer;
1986 static construct_type_t *parse_array_declarator(void)
1990 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
1991 memset(array, 0, sizeof(array[0]));
1992 array->construct_type.type = CONSTRUCT_ARRAY;
1994 if(token.type == T_static) {
1995 array->is_static = true;
1999 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
2000 if(type_qualifiers != 0) {
2001 if(token.type == T_static) {
2002 array->is_static = true;
2006 array->type_qualifiers = type_qualifiers;
2008 if(token.type == '*' && look_ahead(1)->type == ']') {
2009 array->is_variable = true;
2011 } else if(token.type != ']') {
2012 array->size = parse_assignment_expression();
2017 return (construct_type_t*) array;
2020 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2024 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2026 declaration_t *parameters = parse_parameters(&type->function);
2027 if(declaration != NULL) {
2028 declaration->context.declarations = parameters;
2031 construct_function_type_t *construct_function_type =
2032 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2033 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2034 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2035 construct_function_type->function_type = type;
2039 return (construct_type_t*) construct_function_type;
2042 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2043 bool may_be_abstract)
2045 /* construct a single linked list of construct_type_t's which describe
2046 * how to construct the final declarator type */
2047 construct_type_t *first = NULL;
2048 construct_type_t *last = NULL;
2051 while(token.type == '*') {
2052 construct_type_t *type = parse_pointer_declarator();
2063 /* TODO: find out if this is correct */
2066 construct_type_t *inner_types = NULL;
2068 switch(token.type) {
2070 if(declaration == NULL) {
2071 errorf(HERE, "no identifier expected in typename");
2073 declaration->symbol = token.v.symbol;
2074 declaration->source_position = token.source_position;
2080 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2086 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2087 /* avoid a loop in the outermost scope, because eat_statement doesn't
2089 if(token.type == '}' && current_function == NULL) {
2097 construct_type_t *p = last;
2100 construct_type_t *type;
2101 switch(token.type) {
2103 type = parse_function_declarator(declaration);
2106 type = parse_array_declarator();
2109 goto declarator_finished;
2112 /* insert in the middle of the list (behind p) */
2114 type->next = p->next;
2125 declarator_finished:
2128 /* append inner_types at the end of the list, we don't to set last anymore
2129 * as it's not needed anymore */
2131 assert(first == NULL);
2132 first = inner_types;
2134 last->next = inner_types;
2140 static type_t *construct_declarator_type(construct_type_t *construct_list,
2143 construct_type_t *iter = construct_list;
2144 for( ; iter != NULL; iter = iter->next) {
2145 switch(iter->type) {
2146 case CONSTRUCT_INVALID:
2147 panic("invalid type construction found");
2148 case CONSTRUCT_FUNCTION: {
2149 construct_function_type_t *construct_function_type
2150 = (construct_function_type_t*) iter;
2152 type_t *function_type = construct_function_type->function_type;
2154 function_type->function.return_type = type;
2156 type_t *skipped_return_type = skip_typeref(type);
2157 if (is_type_function(skipped_return_type)) {
2158 errorf(HERE, "function returning function is not allowed");
2159 type = type_error_type;
2160 } else if (is_type_array(skipped_return_type)) {
2161 errorf(HERE, "function returning array is not allowed");
2162 type = type_error_type;
2164 type = function_type;
2169 case CONSTRUCT_POINTER: {
2170 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2171 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2172 pointer_type->pointer.points_to = type;
2173 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2175 type = pointer_type;
2179 case CONSTRUCT_ARRAY: {
2180 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2181 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2183 array_type->base.qualifiers = parsed_array->type_qualifiers;
2184 array_type->array.element_type = type;
2185 array_type->array.is_static = parsed_array->is_static;
2186 array_type->array.is_variable = parsed_array->is_variable;
2187 array_type->array.size = parsed_array->size;
2189 type_t *skipped_type = skip_typeref(type);
2190 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
2191 errorf(HERE, "array of void is not allowed");
2192 type = type_error_type;
2200 type_t *hashed_type = typehash_insert(type);
2201 if(hashed_type != type) {
2202 /* the function type was constructed earlier freeing it here will
2203 * destroy other types... */
2204 if(iter->type != CONSTRUCT_FUNCTION) {
2214 static declaration_t *parse_declarator(
2215 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2217 declaration_t *const declaration = allocate_declaration_zero();
2218 declaration->storage_class = specifiers->storage_class;
2219 declaration->modifiers = specifiers->decl_modifiers;
2220 declaration->is_inline = specifiers->is_inline;
2222 construct_type_t *construct_type
2223 = parse_inner_declarator(declaration, may_be_abstract);
2224 type_t *const type = specifiers->type;
2225 declaration->type = construct_declarator_type(construct_type, type);
2227 if(construct_type != NULL) {
2228 obstack_free(&temp_obst, construct_type);
2234 static type_t *parse_abstract_declarator(type_t *base_type)
2236 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2238 type_t *result = construct_declarator_type(construct_type, base_type);
2239 if(construct_type != NULL) {
2240 obstack_free(&temp_obst, construct_type);
2246 static declaration_t *append_declaration(declaration_t* const declaration)
2248 if (last_declaration != NULL) {
2249 last_declaration->next = declaration;
2251 context->declarations = declaration;
2253 last_declaration = declaration;
2257 static declaration_t *internal_record_declaration(
2258 declaration_t *const declaration,
2259 const bool is_function_definition)
2261 const symbol_t *const symbol = declaration->symbol;
2262 const namespace_t namespc = (namespace_t)declaration->namespc;
2264 const type_t *const type = skip_typeref(declaration->type);
2265 if (is_type_function(type) &&
2266 type->function.unspecified_parameters &&
2267 warning.strict_prototypes) {
2268 warningf(declaration->source_position,
2269 "function declaration '%#T' is not a prototype",
2270 type, declaration->symbol);
2273 declaration_t *const previous_declaration = get_declaration(symbol, namespc);
2274 assert(declaration != previous_declaration);
2275 if (previous_declaration != NULL) {
2276 if (previous_declaration->parent_context == context) {
2277 /* can happen for K&R style declarations */
2278 if(previous_declaration->type == NULL) {
2279 previous_declaration->type = declaration->type;
2282 const type_t *const prev_type = skip_typeref(previous_declaration->type);
2283 if (!types_compatible(type, prev_type)) {
2284 errorf(declaration->source_position,
2285 "declaration '%#T' is incompatible with previous declaration '%#T'",
2286 type, symbol, previous_declaration->type, symbol);
2287 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2289 unsigned old_storage_class = previous_declaration->storage_class;
2290 unsigned new_storage_class = declaration->storage_class;
2292 /* pretend no storage class means extern for function declarations
2293 * (except if the previous declaration is neither none nor extern) */
2294 if (is_type_function(type)) {
2295 switch (old_storage_class) {
2296 case STORAGE_CLASS_NONE:
2297 old_storage_class = STORAGE_CLASS_EXTERN;
2299 case STORAGE_CLASS_EXTERN:
2300 if (is_function_definition) {
2301 if (warning.missing_prototypes &&
2302 prev_type->function.unspecified_parameters) {
2303 warningf(declaration->source_position, "no previous prototype for '%#T'", type, symbol);
2305 } else if (new_storage_class == STORAGE_CLASS_NONE) {
2306 new_storage_class = STORAGE_CLASS_EXTERN;
2314 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2315 new_storage_class == STORAGE_CLASS_EXTERN) {
2316 warn_redundant_declaration:
2317 if (warning.redundant_decls) {
2318 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2319 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2321 } else if (current_function == NULL) {
2322 if (old_storage_class != STORAGE_CLASS_STATIC &&
2323 new_storage_class == STORAGE_CLASS_STATIC) {
2324 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2325 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2327 if (old_storage_class != STORAGE_CLASS_EXTERN && !is_function_definition) {
2328 goto warn_redundant_declaration;
2330 if (new_storage_class == STORAGE_CLASS_NONE) {
2331 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2335 if (old_storage_class == new_storage_class) {
2336 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2338 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2340 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2343 return previous_declaration;
2345 } else if (is_function_definition &&
2346 declaration->storage_class != STORAGE_CLASS_STATIC) {
2347 if (warning.missing_prototypes) {
2348 warningf(declaration->source_position, "no previous prototype for '%#T'", type, symbol);
2349 } else if (warning.missing_declarations) {
2350 warningf(declaration->source_position, "no previous declaration for '%#T'", type, symbol);
2354 assert(declaration->parent_context == NULL);
2355 assert(declaration->symbol != NULL);
2356 assert(context != NULL);
2358 declaration->parent_context = context;
2360 environment_push(declaration);
2361 return append_declaration(declaration);
2364 static declaration_t *record_declaration(declaration_t *declaration)
2366 return internal_record_declaration(declaration, false);
2369 static declaration_t *record_function_definition(declaration_t *declaration)
2371 return internal_record_declaration(declaration, true);
2374 static void parser_error_multiple_definition(declaration_t *declaration,
2375 const source_position_t source_position)
2377 errorf(source_position, "multiple definition of symbol '%Y'",
2378 declaration->symbol);
2379 errorf(declaration->source_position,
2380 "this is the location of the previous definition.");
2383 static bool is_declaration_specifier(const token_t *token,
2384 bool only_type_specifiers)
2386 switch(token->type) {
2390 return is_typedef_symbol(token->v.symbol);
2392 case T___extension__:
2395 return !only_type_specifiers;
2402 static void parse_init_declarator_rest(declaration_t *declaration)
2406 type_t *orig_type = declaration->type;
2407 type_t *type = type = skip_typeref(orig_type);
2409 if(declaration->init.initializer != NULL) {
2410 parser_error_multiple_definition(declaration, token.source_position);
2413 initializer_t *initializer = parse_initializer(type);
2415 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2416 * the array type size */
2417 if(is_type_array(type) && initializer != NULL) {
2418 array_type_t *array_type = &type->array;
2420 if(array_type->size == NULL) {
2421 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2423 cnst->base.datatype = type_size_t;
2425 switch (initializer->kind) {
2426 case INITIALIZER_LIST: {
2427 cnst->conste.v.int_value = initializer->list.len;
2431 case INITIALIZER_STRING: {
2432 cnst->conste.v.int_value = initializer->string.string.size;
2436 case INITIALIZER_WIDE_STRING: {
2437 cnst->conste.v.int_value = initializer->wide_string.string.size;
2442 panic("invalid initializer type");
2445 array_type->size = cnst;
2449 if(is_type_function(type)) {
2450 errorf(declaration->source_position,
2451 "initializers not allowed for function types at declator '%Y' (type '%T')",
2452 declaration->symbol, orig_type);
2454 declaration->init.initializer = initializer;
2458 /* parse rest of a declaration without any declarator */
2459 static void parse_anonymous_declaration_rest(
2460 const declaration_specifiers_t *specifiers,
2461 parsed_declaration_func finished_declaration)
2465 declaration_t *const declaration = allocate_declaration_zero();
2466 declaration->type = specifiers->type;
2467 declaration->storage_class = specifiers->storage_class;
2468 declaration->source_position = specifiers->source_position;
2470 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2471 warningf(declaration->source_position, "useless storage class in empty declaration");
2474 type_t *type = declaration->type;
2475 switch (type->kind) {
2476 case TYPE_COMPOUND_STRUCT:
2477 case TYPE_COMPOUND_UNION: {
2478 if (type->compound.declaration->symbol == NULL) {
2479 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2488 warningf(declaration->source_position, "empty declaration");
2492 finished_declaration(declaration);
2495 static void parse_declaration_rest(declaration_t *ndeclaration,
2496 const declaration_specifiers_t *specifiers,
2497 parsed_declaration_func finished_declaration)
2500 declaration_t *declaration = finished_declaration(ndeclaration);
2502 type_t *orig_type = declaration->type;
2503 type_t *type = skip_typeref(orig_type);
2505 if (type->kind != TYPE_FUNCTION &&
2506 declaration->is_inline &&
2507 is_type_valid(type)) {
2508 warningf(declaration->source_position,
2509 "variable '%Y' declared 'inline'\n", declaration->symbol);
2512 if(token.type == '=') {
2513 parse_init_declarator_rest(declaration);
2516 if(token.type != ',')
2520 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2525 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2527 symbol_t *symbol = declaration->symbol;
2528 if(symbol == NULL) {
2529 errorf(HERE, "anonymous declaration not valid as function parameter");
2532 namespace_t namespc = (namespace_t) declaration->namespc;
2533 if(namespc != NAMESPACE_NORMAL) {
2534 return record_declaration(declaration);
2537 declaration_t *previous_declaration = get_declaration(symbol, namespc);
2538 if(previous_declaration == NULL ||
2539 previous_declaration->parent_context != context) {
2540 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
2545 if(previous_declaration->type == NULL) {
2546 previous_declaration->type = declaration->type;
2547 previous_declaration->storage_class = declaration->storage_class;
2548 previous_declaration->parent_context = context;
2549 return previous_declaration;
2551 return record_declaration(declaration);
2555 static void parse_declaration(parsed_declaration_func finished_declaration)
2557 declaration_specifiers_t specifiers;
2558 memset(&specifiers, 0, sizeof(specifiers));
2559 parse_declaration_specifiers(&specifiers);
2561 if(token.type == ';') {
2562 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2564 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2565 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2569 static void parse_kr_declaration_list(declaration_t *declaration)
2571 type_t *type = skip_typeref(declaration->type);
2572 if(!is_type_function(type))
2575 if(!type->function.kr_style_parameters)
2578 /* push function parameters */
2579 int top = environment_top();
2580 context_t *last_context = context;
2581 set_context(&declaration->context);
2583 declaration_t *parameter = declaration->context.declarations;
2584 for( ; parameter != NULL; parameter = parameter->next) {
2585 assert(parameter->parent_context == NULL);
2586 parameter->parent_context = context;
2587 environment_push(parameter);
2590 /* parse declaration list */
2591 while(is_declaration_specifier(&token, false)) {
2592 parse_declaration(finished_kr_declaration);
2595 /* pop function parameters */
2596 assert(context == &declaration->context);
2597 set_context(last_context);
2598 environment_pop_to(top);
2600 /* update function type */
2601 type_t *new_type = duplicate_type(type);
2602 new_type->function.kr_style_parameters = false;
2604 function_parameter_t *parameters = NULL;
2605 function_parameter_t *last_parameter = NULL;
2607 declaration_t *parameter_declaration = declaration->context.declarations;
2608 for( ; parameter_declaration != NULL;
2609 parameter_declaration = parameter_declaration->next) {
2610 type_t *parameter_type = parameter_declaration->type;
2611 if(parameter_type == NULL) {
2613 errorf(HERE, "no type specified for function parameter '%Y'",
2614 parameter_declaration->symbol);
2616 if (warning.implicit_int) {
2617 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
2618 parameter_declaration->symbol);
2620 parameter_type = type_int;
2621 parameter_declaration->type = parameter_type;
2625 semantic_parameter(parameter_declaration);
2626 parameter_type = parameter_declaration->type;
2628 function_parameter_t *function_parameter
2629 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2630 memset(function_parameter, 0, sizeof(function_parameter[0]));
2632 function_parameter->type = parameter_type;
2633 if(last_parameter != NULL) {
2634 last_parameter->next = function_parameter;
2636 parameters = function_parameter;
2638 last_parameter = function_parameter;
2640 new_type->function.parameters = parameters;
2642 type = typehash_insert(new_type);
2643 if(type != new_type) {
2644 obstack_free(type_obst, new_type);
2647 declaration->type = type;
2651 * Check if all labels are defined in the current function.
2653 static void check_for_missing_labels(void)
2655 bool first_err = true;
2656 for (const goto_statement_t *goto_statement = goto_first;
2657 goto_statement != NULL;
2658 goto_statement = goto_statement->next) {
2659 const declaration_t *label = goto_statement->label;
2661 if (label->source_position.input_name == NULL) {
2664 diagnosticf("%s: In function '%Y':\n",
2665 current_function->source_position.input_name,
2666 current_function->symbol);
2668 errorf(goto_statement->statement.source_position,
2669 "label '%Y' used but not defined", label->symbol);
2672 goto_first = goto_last = NULL;
2675 static void parse_external_declaration(void)
2677 /* function-definitions and declarations both start with declaration
2679 declaration_specifiers_t specifiers;
2680 memset(&specifiers, 0, sizeof(specifiers));
2681 parse_declaration_specifiers(&specifiers);
2683 /* must be a declaration */
2684 if(token.type == ';') {
2685 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2689 /* declarator is common to both function-definitions and declarations */
2690 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2692 /* must be a declaration */
2693 if(token.type == ',' || token.type == '=' || token.type == ';') {
2694 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2698 /* must be a function definition */
2699 parse_kr_declaration_list(ndeclaration);
2701 if(token.type != '{') {
2702 parse_error_expected("while parsing function definition", '{', 0);
2707 type_t *type = ndeclaration->type;
2709 /* note that we don't skip typerefs: the standard doesn't allow them here
2710 * (so we can't use is_type_function here) */
2711 if(type->kind != TYPE_FUNCTION) {
2712 if (is_type_valid(type)) {
2713 errorf(HERE, "declarator '%#T' has a body but is not a function type",
2714 type, ndeclaration->symbol);
2720 /* § 6.7.5.3 (14) a function definition with () means no
2721 * parameters (and not unspecified parameters) */
2722 if(type->function.unspecified_parameters) {
2723 type_t *duplicate = duplicate_type(type);
2724 duplicate->function.unspecified_parameters = false;
2726 type = typehash_insert(duplicate);
2727 if(type != duplicate) {
2728 obstack_free(type_obst, duplicate);
2730 ndeclaration->type = type;
2733 declaration_t *const declaration = record_function_definition(ndeclaration);
2734 if(ndeclaration != declaration) {
2735 declaration->context = ndeclaration->context;
2737 type = skip_typeref(declaration->type);
2739 /* push function parameters and switch context */
2740 int top = environment_top();
2741 context_t *last_context = context;
2742 set_context(&declaration->context);
2744 declaration_t *parameter = declaration->context.declarations;
2745 for( ; parameter != NULL; parameter = parameter->next) {
2746 if(parameter->parent_context == &ndeclaration->context) {
2747 parameter->parent_context = context;
2749 assert(parameter->parent_context == NULL
2750 || parameter->parent_context == context);
2751 parameter->parent_context = context;
2752 environment_push(parameter);
2755 if(declaration->init.statement != NULL) {
2756 parser_error_multiple_definition(declaration, token.source_position);
2758 goto end_of_parse_external_declaration;
2760 /* parse function body */
2761 int label_stack_top = label_top();
2762 declaration_t *old_current_function = current_function;
2763 current_function = declaration;
2765 declaration->init.statement = parse_compound_statement();
2766 check_for_missing_labels();
2768 assert(current_function == declaration);
2769 current_function = old_current_function;
2770 label_pop_to(label_stack_top);
2773 end_of_parse_external_declaration:
2774 assert(context == &declaration->context);
2775 set_context(last_context);
2776 environment_pop_to(top);
2779 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2781 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2782 type->bitfield.base = base;
2783 type->bitfield.size = size;
2788 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2790 /* TODO: check constraints for struct declarations (in specifiers) */
2792 declaration_t *declaration;
2794 if(token.type == ':') {
2797 type_t *base_type = specifiers->type;
2798 expression_t *size = parse_constant_expression();
2800 type_t *type = make_bitfield_type(base_type, size);
2802 declaration = allocate_declaration_zero();
2803 declaration->namespc = NAMESPACE_NORMAL;
2804 declaration->storage_class = STORAGE_CLASS_NONE;
2805 declaration->source_position = token.source_position;
2806 declaration->modifiers = specifiers->decl_modifiers;
2807 declaration->type = type;
2809 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2811 if(token.type == ':') {
2813 expression_t *size = parse_constant_expression();
2815 type_t *type = make_bitfield_type(declaration->type, size);
2816 declaration->type = type;
2819 record_declaration(declaration);
2821 if(token.type != ',')
2828 static void parse_compound_type_entries(void)
2832 while(token.type != '}' && token.type != T_EOF) {
2833 declaration_specifiers_t specifiers;
2834 memset(&specifiers, 0, sizeof(specifiers));
2835 parse_declaration_specifiers(&specifiers);
2837 parse_struct_declarators(&specifiers);
2839 if(token.type == T_EOF) {
2840 errorf(HERE, "EOF while parsing struct");
2845 static type_t *parse_typename(void)
2847 declaration_specifiers_t specifiers;
2848 memset(&specifiers, 0, sizeof(specifiers));
2849 parse_declaration_specifiers(&specifiers);
2850 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2851 /* TODO: improve error message, user does probably not know what a
2852 * storage class is...
2854 errorf(HERE, "typename may not have a storage class");
2857 type_t *result = parse_abstract_declarator(specifiers.type);
2865 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2866 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2867 expression_t *left);
2869 typedef struct expression_parser_function_t expression_parser_function_t;
2870 struct expression_parser_function_t {
2871 unsigned precedence;
2872 parse_expression_function parser;
2873 unsigned infix_precedence;
2874 parse_expression_infix_function infix_parser;
2877 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2880 * Creates a new invalid expression.
2882 static expression_t *create_invalid_expression(void)
2884 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2885 expression->base.source_position = token.source_position;
2890 * Prints an error message if an expression was expected but not read
2892 static expression_t *expected_expression_error(void)
2894 /* skip the error message if the error token was read */
2895 if (token.type != T_ERROR) {
2896 errorf(HERE, "expected expression, got token '%K'", &token);
2900 return create_invalid_expression();
2904 * Parse a string constant.
2906 static expression_t *parse_string_const(void)
2908 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2909 cnst->base.datatype = type_string;
2910 cnst->string.value = parse_string_literals();
2916 * Parse a wide string constant.
2918 static expression_t *parse_wide_string_const(void)
2920 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2921 cnst->base.datatype = type_wchar_t_ptr;
2922 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2928 * Parse an integer constant.
2930 static expression_t *parse_int_const(void)
2932 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2933 cnst->base.datatype = token.datatype;
2934 cnst->conste.v.int_value = token.v.intvalue;
2942 * Parse a float constant.
2944 static expression_t *parse_float_const(void)
2946 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2947 cnst->base.datatype = token.datatype;
2948 cnst->conste.v.float_value = token.v.floatvalue;
2955 static declaration_t *create_implicit_function(symbol_t *symbol,
2956 const source_position_t source_position)
2958 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
2959 ntype->function.return_type = type_int;
2960 ntype->function.unspecified_parameters = true;
2962 type_t *type = typehash_insert(ntype);
2967 declaration_t *const declaration = allocate_declaration_zero();
2968 declaration->storage_class = STORAGE_CLASS_EXTERN;
2969 declaration->type = type;
2970 declaration->symbol = symbol;
2971 declaration->source_position = source_position;
2972 declaration->parent_context = global_context;
2974 context_t *old_context = context;
2975 set_context(global_context);
2977 environment_push(declaration);
2978 /* prepend the declaration to the global declarations list */
2979 declaration->next = context->declarations;
2980 context->declarations = declaration;
2982 assert(context == global_context);
2983 set_context(old_context);
2989 * Creates a return_type (func)(argument_type) function type if not
2992 * @param return_type the return type
2993 * @param argument_type the argument type
2995 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
2997 function_parameter_t *parameter
2998 = obstack_alloc(type_obst, sizeof(parameter[0]));
2999 memset(parameter, 0, sizeof(parameter[0]));
3000 parameter->type = argument_type;
3002 type_t *type = allocate_type_zero(TYPE_FUNCTION);
3003 type->function.return_type = return_type;
3004 type->function.parameters = parameter;
3006 type_t *result = typehash_insert(type);
3007 if(result != type) {
3015 * Creates a function type for some function like builtins.
3017 * @param symbol the symbol describing the builtin
3019 static type_t *get_builtin_symbol_type(symbol_t *symbol)
3021 switch(symbol->ID) {
3022 case T___builtin_alloca:
3023 return make_function_1_type(type_void_ptr, type_size_t);
3024 case T___builtin_nan:
3025 return make_function_1_type(type_double, type_string);
3026 case T___builtin_nanf:
3027 return make_function_1_type(type_float, type_string);
3028 case T___builtin_nand:
3029 return make_function_1_type(type_long_double, type_string);
3030 case T___builtin_va_end:
3031 return make_function_1_type(type_void, type_valist);
3033 panic("not implemented builtin symbol found");
3038 * Performs automatic type cast as described in § 6.3.2.1.
3040 * @param orig_type the original type
3042 static type_t *automatic_type_conversion(type_t *orig_type)
3044 type_t *type = skip_typeref(orig_type);
3045 if(is_type_array(type)) {
3046 array_type_t *array_type = &type->array;
3047 type_t *element_type = array_type->element_type;
3048 unsigned qualifiers = array_type->type.qualifiers;
3050 return make_pointer_type(element_type, qualifiers);
3053 if(is_type_function(type)) {
3054 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3061 * reverts the automatic casts of array to pointer types and function
3062 * to function-pointer types as defined § 6.3.2.1
3064 type_t *revert_automatic_type_conversion(const expression_t *expression)
3066 switch (expression->kind) {
3067 case EXPR_REFERENCE: return expression->reference.declaration->type;
3068 case EXPR_SELECT: return expression->select.compound_entry->type;
3070 case EXPR_UNARY_DEREFERENCE: {
3071 const expression_t *const value = expression->unary.value;
3072 type_t *const type = skip_typeref(value->base.datatype);
3073 assert(is_type_pointer(type));
3074 return type->pointer.points_to;
3077 case EXPR_BUILTIN_SYMBOL:
3078 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
3080 case EXPR_ARRAY_ACCESS: {
3081 const expression_t *const array_ref = expression->array_access.array_ref;
3082 type_t *const type_left = skip_typeref(array_ref->base.datatype);
3083 if (!is_type_valid(type_left))
3085 assert(is_type_pointer(type_left));
3086 return type_left->pointer.points_to;
3092 return expression->base.datatype;
3095 static expression_t *parse_reference(void)
3097 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3099 reference_expression_t *ref = &expression->reference;
3100 ref->symbol = token.v.symbol;
3102 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3104 source_position_t source_position = token.source_position;
3107 if(declaration == NULL) {
3108 if (! strict_mode && token.type == '(') {
3109 /* an implicitly defined function */
3110 if (warning.implicit_function_declaration) {
3111 warningf(HERE, "implicit declaration of function '%Y'",
3115 declaration = create_implicit_function(ref->symbol,
3118 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3123 type_t *type = declaration->type;
3125 /* we always do the auto-type conversions; the & and sizeof parser contains
3126 * code to revert this! */
3127 type = automatic_type_conversion(type);
3129 ref->declaration = declaration;
3130 ref->expression.datatype = type;
3135 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3139 /* TODO check if explicit cast is allowed and issue warnings/errors */
3142 static expression_t *parse_cast(void)
3144 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3146 cast->base.source_position = token.source_position;
3148 type_t *type = parse_typename();
3151 expression_t *value = parse_sub_expression(20);
3153 check_cast_allowed(value, type);
3155 cast->base.datatype = type;
3156 cast->unary.value = value;
3161 static expression_t *parse_statement_expression(void)
3163 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3165 statement_t *statement = parse_compound_statement();
3166 expression->statement.statement = statement;
3167 expression->base.source_position = statement->base.source_position;
3169 /* find last statement and use its type */
3170 type_t *type = type_void;
3171 const statement_t *stmt = statement->compound.statements;
3173 while (stmt->base.next != NULL)
3174 stmt = stmt->base.next;
3176 if (stmt->kind == STATEMENT_EXPRESSION) {
3177 type = stmt->expression.expression->base.datatype;
3180 warningf(expression->base.source_position, "empty statement expression ({})");
3182 expression->base.datatype = type;
3189 static expression_t *parse_brace_expression(void)
3193 switch(token.type) {
3195 /* gcc extension: a statement expression */
3196 return parse_statement_expression();
3200 return parse_cast();
3202 if(is_typedef_symbol(token.v.symbol)) {
3203 return parse_cast();
3207 expression_t *result = parse_expression();
3213 static expression_t *parse_function_keyword(void)
3218 if (current_function == NULL) {
3219 errorf(HERE, "'__func__' used outside of a function");
3222 string_literal_expression_t *expression
3223 = allocate_ast_zero(sizeof(expression[0]));
3225 expression->expression.kind = EXPR_FUNCTION;
3226 expression->expression.datatype = type_string;
3228 return (expression_t*) expression;
3231 static expression_t *parse_pretty_function_keyword(void)
3233 eat(T___PRETTY_FUNCTION__);
3236 if (current_function == NULL) {
3237 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3240 string_literal_expression_t *expression
3241 = allocate_ast_zero(sizeof(expression[0]));
3243 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3244 expression->expression.datatype = type_string;
3246 return (expression_t*) expression;
3249 static designator_t *parse_designator(void)
3251 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3253 if(token.type != T_IDENTIFIER) {
3254 parse_error_expected("while parsing member designator",
3259 result->symbol = token.v.symbol;
3262 designator_t *last_designator = result;
3264 if(token.type == '.') {
3266 if(token.type != T_IDENTIFIER) {
3267 parse_error_expected("while parsing member designator",
3272 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3273 designator->symbol = token.v.symbol;
3276 last_designator->next = designator;
3277 last_designator = designator;
3280 if(token.type == '[') {
3282 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3283 designator->array_access = parse_expression();
3284 if(designator->array_access == NULL) {
3290 last_designator->next = designator;
3291 last_designator = designator;
3300 static expression_t *parse_offsetof(void)
3302 eat(T___builtin_offsetof);
3304 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3305 expression->base.datatype = type_size_t;
3308 expression->offsetofe.type = parse_typename();
3310 expression->offsetofe.designator = parse_designator();
3316 static expression_t *parse_va_start(void)
3318 eat(T___builtin_va_start);
3320 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3323 expression->va_starte.ap = parse_assignment_expression();
3325 expression_t *const expr = parse_assignment_expression();
3326 if (expr->kind == EXPR_REFERENCE) {
3327 declaration_t *const decl = expr->reference.declaration;
3328 if (decl->parent_context == ¤t_function->context &&
3329 decl->next == NULL) {
3330 expression->va_starte.parameter = decl;
3335 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3337 return create_invalid_expression();
3340 static expression_t *parse_va_arg(void)
3342 eat(T___builtin_va_arg);
3344 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3347 expression->va_arge.ap = parse_assignment_expression();
3349 expression->base.datatype = parse_typename();
3355 static expression_t *parse_builtin_symbol(void)
3357 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3359 symbol_t *symbol = token.v.symbol;
3361 expression->builtin_symbol.symbol = symbol;
3364 type_t *type = get_builtin_symbol_type(symbol);
3365 type = automatic_type_conversion(type);
3367 expression->base.datatype = type;
3371 static expression_t *parse_builtin_constant(void)
3373 eat(T___builtin_constant_p);
3375 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3378 expression->builtin_constant.value = parse_assignment_expression();
3380 expression->base.datatype = type_int;
3385 static expression_t *parse_builtin_prefetch(void)
3387 eat(T___builtin_prefetch);
3389 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3392 expression->builtin_prefetch.adr = parse_assignment_expression();
3393 if (token.type == ',') {
3395 expression->builtin_prefetch.rw = parse_assignment_expression();
3397 if (token.type == ',') {
3399 expression->builtin_prefetch.locality = parse_assignment_expression();
3402 expression->base.datatype = type_void;
3407 static expression_t *parse_compare_builtin(void)
3409 expression_t *expression;
3411 switch(token.type) {
3412 case T___builtin_isgreater:
3413 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3415 case T___builtin_isgreaterequal:
3416 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3418 case T___builtin_isless:
3419 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3421 case T___builtin_islessequal:
3422 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3424 case T___builtin_islessgreater:
3425 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3427 case T___builtin_isunordered:
3428 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3431 panic("invalid compare builtin found");
3437 expression->binary.left = parse_assignment_expression();
3439 expression->binary.right = parse_assignment_expression();
3442 type_t *const orig_type_left = expression->binary.left->base.datatype;
3443 type_t *const orig_type_right = expression->binary.right->base.datatype;
3445 type_t *const type_left = skip_typeref(orig_type_left);
3446 type_t *const type_right = skip_typeref(orig_type_right);
3447 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3448 if (is_type_valid(type_left) && is_type_valid(type_right)) {
3449 type_error_incompatible("invalid operands in comparison",
3450 token.source_position, orig_type_left, orig_type_right);
3453 semantic_comparison(&expression->binary);
3459 static expression_t *parse_builtin_expect(void)
3461 eat(T___builtin_expect);
3463 expression_t *expression
3464 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3467 expression->binary.left = parse_assignment_expression();
3469 expression->binary.right = parse_constant_expression();
3472 expression->base.datatype = expression->binary.left->base.datatype;
3477 static expression_t *parse_assume(void) {
3480 expression_t *expression
3481 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3484 expression->unary.value = parse_assignment_expression();
3487 expression->base.datatype = type_void;
3491 static expression_t *parse_alignof(void) {
3494 expression_t *expression
3495 = allocate_expression_zero(EXPR_ALIGNOF);
3498 expression->alignofe.type = parse_typename();
3501 expression->base.datatype = type_size_t;
3505 static expression_t *parse_primary_expression(void)
3507 switch(token.type) {
3509 return parse_int_const();
3510 case T_FLOATINGPOINT:
3511 return parse_float_const();
3512 case T_STRING_LITERAL:
3513 return parse_string_const();
3514 case T_WIDE_STRING_LITERAL:
3515 return parse_wide_string_const();
3517 return parse_reference();
3518 case T___FUNCTION__:
3520 return parse_function_keyword();
3521 case T___PRETTY_FUNCTION__:
3522 return parse_pretty_function_keyword();
3523 case T___builtin_offsetof:
3524 return parse_offsetof();
3525 case T___builtin_va_start:
3526 return parse_va_start();
3527 case T___builtin_va_arg:
3528 return parse_va_arg();
3529 case T___builtin_expect:
3530 return parse_builtin_expect();
3531 case T___builtin_nanf:
3532 case T___builtin_alloca:
3533 case T___builtin_va_end:
3534 return parse_builtin_symbol();
3535 case T___builtin_isgreater:
3536 case T___builtin_isgreaterequal:
3537 case T___builtin_isless:
3538 case T___builtin_islessequal:
3539 case T___builtin_islessgreater:
3540 case T___builtin_isunordered:
3541 return parse_compare_builtin();
3542 case T___builtin_constant_p:
3543 return parse_builtin_constant();
3544 case T___builtin_prefetch:
3545 return parse_builtin_prefetch();
3547 return parse_alignof();
3549 return parse_assume();
3552 return parse_brace_expression();
3555 errorf(HERE, "unexpected token '%K'", &token);
3558 return create_invalid_expression();
3562 * Check if the expression has the character type and issue a warning then.
3564 static void check_for_char_index_type(const expression_t *expression) {
3565 type_t *const type = expression->base.datatype;
3566 const type_t *const base_type = skip_typeref(type);
3568 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
3569 warning.char_subscripts) {
3570 warningf(expression->base.source_position,
3571 "array subscript has type '%T'", type);
3575 static expression_t *parse_array_expression(unsigned precedence,
3582 expression_t *inside = parse_expression();
3584 array_access_expression_t *array_access
3585 = allocate_ast_zero(sizeof(array_access[0]));
3587 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3589 type_t *const orig_type_left = left->base.datatype;
3590 type_t *const orig_type_inside = inside->base.datatype;
3592 type_t *const type_left = skip_typeref(orig_type_left);
3593 type_t *const type_inside = skip_typeref(orig_type_inside);
3595 type_t *return_type;
3596 if (is_type_pointer(type_left)) {
3597 return_type = type_left->pointer.points_to;
3598 array_access->array_ref = left;
3599 array_access->index = inside;
3600 check_for_char_index_type(inside);
3601 } else if (is_type_pointer(type_inside)) {
3602 return_type = type_inside->pointer.points_to;
3603 array_access->array_ref = inside;
3604 array_access->index = left;
3605 array_access->flipped = true;
3606 check_for_char_index_type(left);
3608 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
3610 "array access on object with non-pointer types '%T', '%T'",
3611 orig_type_left, orig_type_inside);
3613 return_type = type_error_type;
3614 array_access->array_ref = create_invalid_expression();
3617 if(token.type != ']') {
3618 parse_error_expected("Problem while parsing array access", ']', 0);
3619 return (expression_t*) array_access;
3623 return_type = automatic_type_conversion(return_type);
3624 array_access->expression.datatype = return_type;
3626 return (expression_t*) array_access;
3629 static expression_t *parse_sizeof(unsigned precedence)
3633 sizeof_expression_t *sizeof_expression
3634 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3635 sizeof_expression->expression.kind = EXPR_SIZEOF;
3636 sizeof_expression->expression.datatype = type_size_t;
3638 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3640 sizeof_expression->type = parse_typename();
3643 expression_t *expression = parse_sub_expression(precedence);
3644 expression->base.datatype = revert_automatic_type_conversion(expression);
3646 sizeof_expression->type = expression->base.datatype;
3647 sizeof_expression->size_expression = expression;
3650 return (expression_t*) sizeof_expression;
3653 static expression_t *parse_select_expression(unsigned precedence,
3654 expression_t *compound)
3657 assert(token.type == '.' || token.type == T_MINUSGREATER);
3659 bool is_pointer = (token.type == T_MINUSGREATER);
3662 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3663 select->select.compound = compound;
3665 if(token.type != T_IDENTIFIER) {
3666 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3669 symbol_t *symbol = token.v.symbol;
3670 select->select.symbol = symbol;
3673 type_t *const orig_type = compound->base.datatype;
3674 type_t *const type = skip_typeref(orig_type);
3676 type_t *type_left = type;
3678 if (!is_type_pointer(type)) {
3679 if (is_type_valid(type)) {
3680 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3682 return create_invalid_expression();
3684 type_left = type->pointer.points_to;
3686 type_left = skip_typeref(type_left);
3688 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
3689 type_left->kind != TYPE_COMPOUND_UNION) {
3690 if (is_type_valid(type_left)) {
3691 errorf(HERE, "request for member '%Y' in something not a struct or "
3692 "union, but '%T'", symbol, type_left);
3694 return create_invalid_expression();
3697 declaration_t *const declaration = type_left->compound.declaration;
3699 if(!declaration->init.is_defined) {
3700 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3702 return create_invalid_expression();
3705 declaration_t *iter = declaration->context.declarations;
3706 for( ; iter != NULL; iter = iter->next) {
3707 if(iter->symbol == symbol) {
3712 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3713 return create_invalid_expression();
3716 /* we always do the auto-type conversions; the & and sizeof parser contains
3717 * code to revert this! */
3718 type_t *expression_type = automatic_type_conversion(iter->type);
3720 select->select.compound_entry = iter;
3721 select->base.datatype = expression_type;
3723 if(expression_type->kind == TYPE_BITFIELD) {
3724 expression_t *extract
3725 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3726 extract->unary.value = select;
3727 extract->base.datatype = expression_type->bitfield.base;
3736 * Parse a call expression, ie. expression '( ... )'.
3738 * @param expression the function address
3740 static expression_t *parse_call_expression(unsigned precedence,
3741 expression_t *expression)
3744 expression_t *result = allocate_expression_zero(EXPR_CALL);
3746 call_expression_t *call = &result->call;
3747 call->function = expression;
3749 type_t *const orig_type = expression->base.datatype;
3750 type_t *const type = skip_typeref(orig_type);
3752 function_type_t *function_type = NULL;
3753 if (is_type_pointer(type)) {
3754 type_t *const to_type = skip_typeref(type->pointer.points_to);
3756 if (is_type_function(to_type)) {
3757 function_type = &to_type->function;
3758 call->expression.datatype = function_type->return_type;
3762 if (function_type == NULL && is_type_valid(type)) {
3763 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3766 /* parse arguments */
3769 if(token.type != ')') {
3770 call_argument_t *last_argument = NULL;
3773 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3775 argument->expression = parse_assignment_expression();
3776 if(last_argument == NULL) {
3777 call->arguments = argument;
3779 last_argument->next = argument;
3781 last_argument = argument;
3783 if(token.type != ',')
3790 if(function_type != NULL) {
3791 function_parameter_t *parameter = function_type->parameters;
3792 call_argument_t *argument = call->arguments;
3793 for( ; parameter != NULL && argument != NULL;
3794 parameter = parameter->next, argument = argument->next) {
3795 type_t *expected_type = parameter->type;
3796 /* TODO report context in error messages */
3797 expression_t *const arg_expr = argument->expression;
3798 type_t *const res_type = semantic_assign(expected_type, arg_expr, "function call");
3799 if (res_type == NULL) {
3800 /* TODO improve error message */
3801 errorf(arg_expr->base.source_position,
3802 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
3803 arg_expr, arg_expr->base.datatype, expected_type);
3805 argument->expression = create_implicit_cast(argument->expression, expected_type);
3808 /* too few parameters */
3809 if(parameter != NULL) {
3810 errorf(HERE, "too few arguments to function '%E'", expression);
3811 } else if(argument != NULL) {
3812 /* too many parameters */
3813 if(!function_type->variadic
3814 && !function_type->unspecified_parameters) {
3815 errorf(HERE, "too many arguments to function '%E'", expression);
3817 /* do default promotion */
3818 for( ; argument != NULL; argument = argument->next) {
3819 type_t *type = argument->expression->base.datatype;
3821 type = skip_typeref(type);
3822 if(is_type_integer(type)) {
3823 type = promote_integer(type);
3824 } else if(type == type_float) {
3828 argument->expression
3829 = create_implicit_cast(argument->expression, type);
3832 check_format(&result->call);
3835 check_format(&result->call);
3842 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3844 static bool same_compound_type(const type_t *type1, const type_t *type2)
3847 is_type_compound(type1) &&
3848 type1->kind == type2->kind &&
3849 type1->compound.declaration == type2->compound.declaration;
3853 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3855 * @param expression the conditional expression
3857 static expression_t *parse_conditional_expression(unsigned precedence,
3858 expression_t *expression)
3862 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3864 conditional_expression_t *conditional = &result->conditional;
3865 conditional->condition = expression;
3868 type_t *const condition_type_orig = expression->base.datatype;
3869 type_t *const condition_type = skip_typeref(condition_type_orig);
3870 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
3871 type_error("expected a scalar type in conditional condition",
3872 expression->base.source_position, condition_type_orig);
3875 expression_t *true_expression = parse_expression();
3877 expression_t *false_expression = parse_sub_expression(precedence);
3879 conditional->true_expression = true_expression;
3880 conditional->false_expression = false_expression;
3882 type_t *const orig_true_type = true_expression->base.datatype;
3883 type_t *const orig_false_type = false_expression->base.datatype;
3884 type_t *const true_type = skip_typeref(orig_true_type);
3885 type_t *const false_type = skip_typeref(orig_false_type);
3888 type_t *result_type;
3889 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3890 result_type = semantic_arithmetic(true_type, false_type);
3892 true_expression = create_implicit_cast(true_expression, result_type);
3893 false_expression = create_implicit_cast(false_expression, result_type);
3895 conditional->true_expression = true_expression;
3896 conditional->false_expression = false_expression;
3897 conditional->expression.datatype = result_type;
3898 } else if (same_compound_type(true_type, false_type) || (
3899 is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3900 is_type_atomic(false_type, ATOMIC_TYPE_VOID)
3902 /* just take 1 of the 2 types */
3903 result_type = true_type;
3904 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3905 && pointers_compatible(true_type, false_type)) {
3907 result_type = true_type;
3910 if (is_type_valid(true_type) && is_type_valid(false_type)) {
3911 type_error_incompatible("while parsing conditional",
3912 expression->base.source_position, true_type,
3915 result_type = type_error_type;
3918 conditional->expression.datatype = result_type;
3923 * Parse an extension expression.
3925 static expression_t *parse_extension(unsigned precedence)
3927 eat(T___extension__);
3929 /* TODO enable extensions */
3930 expression_t *expression = parse_sub_expression(precedence);
3931 /* TODO disable extensions */
3935 static expression_t *parse_builtin_classify_type(const unsigned precedence)
3937 eat(T___builtin_classify_type);
3939 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
3940 result->base.datatype = type_int;
3943 expression_t *expression = parse_sub_expression(precedence);
3945 result->classify_type.type_expression = expression;
3950 static void semantic_incdec(unary_expression_t *expression)
3952 type_t *const orig_type = expression->value->base.datatype;
3953 type_t *const type = skip_typeref(orig_type);
3954 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
3955 if (is_type_valid(type)) {
3956 /* TODO: improve error message */
3957 errorf(HERE, "operation needs an arithmetic or pointer type");
3962 expression->expression.datatype = orig_type;
3965 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
3967 type_t *const orig_type = expression->value->base.datatype;
3968 type_t *const type = skip_typeref(orig_type);
3969 if(!is_type_arithmetic(type)) {
3970 if (is_type_valid(type)) {
3971 /* TODO: improve error message */
3972 errorf(HERE, "operation needs an arithmetic type");
3977 expression->expression.datatype = orig_type;
3980 static void semantic_unexpr_scalar(unary_expression_t *expression)
3982 type_t *const orig_type = expression->value->base.datatype;
3983 type_t *const type = skip_typeref(orig_type);
3984 if (!is_type_scalar(type)) {
3985 if (is_type_valid(type)) {
3986 errorf(HERE, "operand of ! must be of scalar type");
3991 expression->expression.datatype = orig_type;
3994 static void semantic_unexpr_integer(unary_expression_t *expression)
3996 type_t *const orig_type = expression->value->base.datatype;
3997 type_t *const type = skip_typeref(orig_type);
3998 if (!is_type_integer(type)) {
3999 if (is_type_valid(type)) {
4000 errorf(HERE, "operand of ~ must be of integer type");
4005 expression->expression.datatype = orig_type;
4008 static void semantic_dereference(unary_expression_t *expression)
4010 type_t *const orig_type = expression->value->base.datatype;
4011 type_t *const type = skip_typeref(orig_type);
4012 if(!is_type_pointer(type)) {
4013 if (is_type_valid(type)) {
4014 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4019 type_t *result_type = type->pointer.points_to;
4020 result_type = automatic_type_conversion(result_type);
4021 expression->expression.datatype = result_type;
4025 * Check the semantic of the address taken expression.
4027 static void semantic_take_addr(unary_expression_t *expression)
4029 expression_t *value = expression->value;
4030 value->base.datatype = revert_automatic_type_conversion(value);
4032 type_t *orig_type = value->base.datatype;
4033 if(!is_type_valid(orig_type))
4036 if(value->kind == EXPR_REFERENCE) {
4037 declaration_t *const declaration = value->reference.declaration;
4038 if(declaration != NULL) {
4039 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4040 errorf(expression->expression.source_position,
4041 "address of register variable '%Y' requested",
4042 declaration->symbol);
4044 declaration->address_taken = 1;
4048 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4051 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4052 static expression_t *parse_##unexpression_type(unsigned precedence) \
4056 expression_t *unary_expression \
4057 = allocate_expression_zero(unexpression_type); \
4058 unary_expression->base.source_position = HERE; \
4059 unary_expression->unary.value = parse_sub_expression(precedence); \
4061 sfunc(&unary_expression->unary); \
4063 return unary_expression; \
4066 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4067 semantic_unexpr_arithmetic)
4068 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4069 semantic_unexpr_arithmetic)
4070 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4071 semantic_unexpr_scalar)
4072 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4073 semantic_dereference)
4074 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4076 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4077 semantic_unexpr_integer)
4078 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4080 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4083 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4085 static expression_t *parse_##unexpression_type(unsigned precedence, \
4086 expression_t *left) \
4088 (void) precedence; \
4091 expression_t *unary_expression \
4092 = allocate_expression_zero(unexpression_type); \
4093 unary_expression->unary.value = left; \
4095 sfunc(&unary_expression->unary); \
4097 return unary_expression; \
4100 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4101 EXPR_UNARY_POSTFIX_INCREMENT,
4103 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4104 EXPR_UNARY_POSTFIX_DECREMENT,
4107 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4109 /* TODO: handle complex + imaginary types */
4111 /* § 6.3.1.8 Usual arithmetic conversions */
4112 if(type_left == type_long_double || type_right == type_long_double) {
4113 return type_long_double;
4114 } else if(type_left == type_double || type_right == type_double) {
4116 } else if(type_left == type_float || type_right == type_float) {
4120 type_right = promote_integer(type_right);
4121 type_left = promote_integer(type_left);
4123 if(type_left == type_right)
4126 bool signed_left = is_type_signed(type_left);
4127 bool signed_right = is_type_signed(type_right);
4128 int rank_left = get_rank(type_left);
4129 int rank_right = get_rank(type_right);
4130 if(rank_left < rank_right) {
4131 if(signed_left == signed_right || !signed_right) {
4137 if(signed_left == signed_right || !signed_left) {
4146 * Check the semantic restrictions for a binary expression.
4148 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4150 expression_t *const left = expression->left;
4151 expression_t *const right = expression->right;
4152 type_t *const orig_type_left = left->base.datatype;
4153 type_t *const orig_type_right = right->base.datatype;
4154 type_t *const type_left = skip_typeref(orig_type_left);
4155 type_t *const type_right = skip_typeref(orig_type_right);
4157 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4158 /* TODO: improve error message */
4159 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4160 errorf(HERE, "operation needs arithmetic types");
4165 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4166 expression->left = create_implicit_cast(left, arithmetic_type);
4167 expression->right = create_implicit_cast(right, arithmetic_type);
4168 expression->expression.datatype = arithmetic_type;
4171 static void semantic_shift_op(binary_expression_t *expression)
4173 expression_t *const left = expression->left;
4174 expression_t *const right = expression->right;
4175 type_t *const orig_type_left = left->base.datatype;
4176 type_t *const orig_type_right = right->base.datatype;
4177 type_t * type_left = skip_typeref(orig_type_left);
4178 type_t * type_right = skip_typeref(orig_type_right);
4180 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4181 /* TODO: improve error message */
4182 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4183 errorf(HERE, "operation needs integer types");
4188 type_left = promote_integer(type_left);
4189 type_right = promote_integer(type_right);
4191 expression->left = create_implicit_cast(left, type_left);
4192 expression->right = create_implicit_cast(right, type_right);
4193 expression->expression.datatype = type_left;
4196 static void semantic_add(binary_expression_t *expression)
4198 expression_t *const left = expression->left;
4199 expression_t *const right = expression->right;
4200 type_t *const orig_type_left = left->base.datatype;
4201 type_t *const orig_type_right = right->base.datatype;
4202 type_t *const type_left = skip_typeref(orig_type_left);
4203 type_t *const type_right = skip_typeref(orig_type_right);
4206 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4207 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4208 expression->left = create_implicit_cast(left, arithmetic_type);
4209 expression->right = create_implicit_cast(right, arithmetic_type);
4210 expression->expression.datatype = arithmetic_type;
4212 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4213 expression->expression.datatype = type_left;
4214 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4215 expression->expression.datatype = type_right;
4216 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4217 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4221 static void semantic_sub(binary_expression_t *expression)
4223 expression_t *const left = expression->left;
4224 expression_t *const right = expression->right;
4225 type_t *const orig_type_left = left->base.datatype;
4226 type_t *const orig_type_right = right->base.datatype;
4227 type_t *const type_left = skip_typeref(orig_type_left);
4228 type_t *const type_right = skip_typeref(orig_type_right);
4231 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4232 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4233 expression->left = create_implicit_cast(left, arithmetic_type);
4234 expression->right = create_implicit_cast(right, arithmetic_type);
4235 expression->expression.datatype = arithmetic_type;
4237 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4238 expression->expression.datatype = type_left;
4239 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4240 if(!pointers_compatible(type_left, type_right)) {
4241 errorf(HERE, "pointers to incompatible objects to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4243 expression->expression.datatype = type_ptrdiff_t;
4245 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4246 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4250 static void semantic_comparison(binary_expression_t *expression)
4252 expression_t *left = expression->left;
4253 expression_t *right = expression->right;
4254 type_t *orig_type_left = left->base.datatype;
4255 type_t *orig_type_right = right->base.datatype;
4257 type_t *type_left = skip_typeref(orig_type_left);
4258 type_t *type_right = skip_typeref(orig_type_right);
4260 /* TODO non-arithmetic types */
4261 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4262 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4263 expression->left = create_implicit_cast(left, arithmetic_type);
4264 expression->right = create_implicit_cast(right, arithmetic_type);
4265 expression->expression.datatype = arithmetic_type;
4266 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4267 /* TODO check compatibility */
4268 } else if (is_type_pointer(type_left)) {
4269 expression->right = create_implicit_cast(right, type_left);
4270 } else if (is_type_pointer(type_right)) {
4271 expression->left = create_implicit_cast(left, type_right);
4272 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4273 type_error_incompatible("invalid operands in comparison",
4274 token.source_position, type_left, type_right);
4276 expression->expression.datatype = type_int;
4279 static void semantic_arithmetic_assign(binary_expression_t *expression)
4281 expression_t *left = expression->left;
4282 expression_t *right = expression->right;
4283 type_t *orig_type_left = left->base.datatype;
4284 type_t *orig_type_right = right->base.datatype;
4286 type_t *type_left = skip_typeref(orig_type_left);
4287 type_t *type_right = skip_typeref(orig_type_right);
4289 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4290 /* TODO: improve error message */
4291 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4292 errorf(HERE, "operation needs arithmetic types");
4297 /* combined instructions are tricky. We can't create an implicit cast on
4298 * the left side, because we need the uncasted form for the store.
4299 * The ast2firm pass has to know that left_type must be right_type
4300 * for the arithmetic operation and create a cast by itself */
4301 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4302 expression->right = create_implicit_cast(right, arithmetic_type);
4303 expression->expression.datatype = type_left;
4306 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4308 expression_t *const left = expression->left;
4309 expression_t *const right = expression->right;
4310 type_t *const orig_type_left = left->base.datatype;
4311 type_t *const orig_type_right = right->base.datatype;
4312 type_t *const type_left = skip_typeref(orig_type_left);
4313 type_t *const type_right = skip_typeref(orig_type_right);
4315 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4316 /* combined instructions are tricky. We can't create an implicit cast on
4317 * the left side, because we need the uncasted form for the store.
4318 * The ast2firm pass has to know that left_type must be right_type
4319 * for the arithmetic operation and create a cast by itself */
4320 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4321 expression->right = create_implicit_cast(right, arithmetic_type);
4322 expression->expression.datatype = type_left;
4323 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4324 expression->expression.datatype = type_left;
4325 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4326 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4331 * Check the semantic restrictions of a logical expression.
4333 static void semantic_logical_op(binary_expression_t *expression)
4335 expression_t *const left = expression->left;
4336 expression_t *const right = expression->right;
4337 type_t *const orig_type_left = left->base.datatype;
4338 type_t *const orig_type_right = right->base.datatype;
4339 type_t *const type_left = skip_typeref(orig_type_left);
4340 type_t *const type_right = skip_typeref(orig_type_right);
4342 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4343 /* TODO: improve error message */
4344 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4345 errorf(HERE, "operation needs scalar types");
4350 expression->expression.datatype = type_int;
4354 * Checks if a compound type has constant fields.
4356 static bool has_const_fields(const compound_type_t *type)
4358 const context_t *context = &type->declaration->context;
4359 const declaration_t *declaration = context->declarations;
4361 for (; declaration != NULL; declaration = declaration->next) {
4362 if (declaration->namespc != NAMESPACE_NORMAL)
4365 const type_t *decl_type = skip_typeref(declaration->type);
4366 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4374 * Check the semantic restrictions of a binary assign expression.
4376 static void semantic_binexpr_assign(binary_expression_t *expression)
4378 expression_t *left = expression->left;
4379 type_t *orig_type_left = left->base.datatype;
4381 type_t *type_left = revert_automatic_type_conversion(left);
4382 type_left = skip_typeref(orig_type_left);
4384 /* must be a modifiable lvalue */
4385 if (is_type_array(type_left)) {
4386 errorf(HERE, "cannot assign to arrays ('%E')", left);
4389 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4390 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4394 if(is_type_incomplete(type_left)) {
4396 "left-hand side of assignment '%E' has incomplete type '%T'",
4397 left, orig_type_left);
4400 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4401 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4402 left, orig_type_left);
4406 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
4408 if (res_type == NULL) {
4409 errorf(expression->expression.source_position,
4410 "cannot assign to '%T' from '%T'",
4411 orig_type_left, expression->right->base.datatype);
4413 expression->right = create_implicit_cast(expression->right, res_type);
4416 expression->expression.datatype = orig_type_left;
4419 static bool expression_has_effect(const expression_t *const expr)
4421 switch (expr->kind) {
4422 case EXPR_UNKNOWN: break;
4423 case EXPR_INVALID: break;
4424 case EXPR_REFERENCE: return false;
4425 case EXPR_CONST: return false;
4426 case EXPR_STRING_LITERAL: return false;
4427 case EXPR_WIDE_STRING_LITERAL: return false;
4429 const call_expression_t *const call = &expr->call;
4430 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
4433 switch (call->function->builtin_symbol.symbol->ID) {
4434 case T___builtin_va_end: return true;
4435 default: return false;
4438 case EXPR_CONDITIONAL: {
4439 const conditional_expression_t *const cond = &expr->conditional;
4441 expression_has_effect(cond->true_expression) &&
4442 expression_has_effect(cond->false_expression);
4444 case EXPR_SELECT: return false;
4445 case EXPR_ARRAY_ACCESS: return false;
4446 case EXPR_SIZEOF: return false;
4447 case EXPR_CLASSIFY_TYPE: return false;
4448 case EXPR_ALIGNOF: return false;
4450 case EXPR_FUNCTION: return false;
4451 case EXPR_PRETTY_FUNCTION: return false;
4452 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
4453 case EXPR_BUILTIN_CONSTANT_P: return false;
4454 case EXPR_BUILTIN_PREFETCH: return true;
4455 case EXPR_OFFSETOF: return false;
4456 case EXPR_VA_START: return true;
4457 case EXPR_VA_ARG: return true;
4458 case EXPR_STATEMENT: return true; // TODO
4460 case EXPR_UNARY_NEGATE: return false;
4461 case EXPR_UNARY_PLUS: return false;
4462 case EXPR_UNARY_BITWISE_NEGATE: return false;
4463 case EXPR_UNARY_NOT: return false;
4464 case EXPR_UNARY_DEREFERENCE: return false;
4465 case EXPR_UNARY_TAKE_ADDRESS: return false;
4466 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
4467 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
4468 case EXPR_UNARY_PREFIX_INCREMENT: return true;
4469 case EXPR_UNARY_PREFIX_DECREMENT: return true;
4470 case EXPR_UNARY_CAST:
4471 return is_type_atomic(expr->base.datatype, ATOMIC_TYPE_VOID);
4472 case EXPR_UNARY_CAST_IMPLICIT: return true;
4473 case EXPR_UNARY_ASSUME: return true;
4474 case EXPR_UNARY_BITFIELD_EXTRACT: return false;
4476 case EXPR_BINARY_ADD: return false;
4477 case EXPR_BINARY_SUB: return false;
4478 case EXPR_BINARY_MUL: return false;
4479 case EXPR_BINARY_DIV: return false;
4480 case EXPR_BINARY_MOD: return false;
4481 case EXPR_BINARY_EQUAL: return false;
4482 case EXPR_BINARY_NOTEQUAL: return false;
4483 case EXPR_BINARY_LESS: return false;
4484 case EXPR_BINARY_LESSEQUAL: return false;
4485 case EXPR_BINARY_GREATER: return false;
4486 case EXPR_BINARY_GREATEREQUAL: return false;
4487 case EXPR_BINARY_BITWISE_AND: return false;
4488 case EXPR_BINARY_BITWISE_OR: return false;
4489 case EXPR_BINARY_BITWISE_XOR: return false;
4490 case EXPR_BINARY_SHIFTLEFT: return false;
4491 case EXPR_BINARY_SHIFTRIGHT: return false;
4492 case EXPR_BINARY_ASSIGN: return true;
4493 case EXPR_BINARY_MUL_ASSIGN: return true;
4494 case EXPR_BINARY_DIV_ASSIGN: return true;
4495 case EXPR_BINARY_MOD_ASSIGN: return true;
4496 case EXPR_BINARY_ADD_ASSIGN: return true;
4497 case EXPR_BINARY_SUB_ASSIGN: return true;
4498 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
4499 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
4500 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
4501 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
4502 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
4503 case EXPR_BINARY_LOGICAL_AND:
4504 case EXPR_BINARY_LOGICAL_OR:
4505 case EXPR_BINARY_COMMA:
4506 return expression_has_effect(expr->binary.right);
4508 case EXPR_BINARY_BUILTIN_EXPECT: return true;
4509 case EXPR_BINARY_ISGREATER: return false;
4510 case EXPR_BINARY_ISGREATEREQUAL: return false;
4511 case EXPR_BINARY_ISLESS: return false;
4512 case EXPR_BINARY_ISLESSEQUAL: return false;
4513 case EXPR_BINARY_ISLESSGREATER: return false;
4514 case EXPR_BINARY_ISUNORDERED: return false;
4517 panic("unexpected statement");
4520 static void semantic_comma(binary_expression_t *expression)
4522 if (warning.unused_value) {
4523 const expression_t *const left = expression->left;
4524 if (!expression_has_effect(left)) {
4525 warningf(left->base.source_position, "left-hand operand of comma expression has no effect");
4528 expression->expression.datatype = expression->right->base.datatype;
4531 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4532 static expression_t *parse_##binexpression_type(unsigned precedence, \
4533 expression_t *left) \
4537 expression_t *right = parse_sub_expression(precedence + lr); \
4539 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4540 binexpr->binary.left = left; \
4541 binexpr->binary.right = right; \
4542 sfunc(&binexpr->binary); \
4547 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4548 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4549 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4550 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4551 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4552 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4553 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4554 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4555 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4557 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4558 semantic_comparison, 1)
4559 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4560 semantic_comparison, 1)
4561 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4562 semantic_comparison, 1)
4563 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4564 semantic_comparison, 1)
4566 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4567 semantic_binexpr_arithmetic, 1)
4568 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4569 semantic_binexpr_arithmetic, 1)
4570 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4571 semantic_binexpr_arithmetic, 1)
4572 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4573 semantic_logical_op, 1)
4574 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4575 semantic_logical_op, 1)
4576 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4577 semantic_shift_op, 1)
4578 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4579 semantic_shift_op, 1)
4580 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4581 semantic_arithmetic_addsubb_assign, 0)
4582 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4583 semantic_arithmetic_addsubb_assign, 0)
4584 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4585 semantic_arithmetic_assign, 0)
4586 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4587 semantic_arithmetic_assign, 0)
4588 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4589 semantic_arithmetic_assign, 0)
4590 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4591 semantic_arithmetic_assign, 0)
4592 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4593 semantic_arithmetic_assign, 0)
4594 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4595 semantic_arithmetic_assign, 0)
4596 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4597 semantic_arithmetic_assign, 0)
4598 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4599 semantic_arithmetic_assign, 0)
4601 static expression_t *parse_sub_expression(unsigned precedence)
4603 if(token.type < 0) {
4604 return expected_expression_error();
4607 expression_parser_function_t *parser
4608 = &expression_parsers[token.type];
4609 source_position_t source_position = token.source_position;
4612 if(parser->parser != NULL) {
4613 left = parser->parser(parser->precedence);
4615 left = parse_primary_expression();
4617 assert(left != NULL);
4618 left->base.source_position = source_position;
4621 if(token.type < 0) {
4622 return expected_expression_error();
4625 parser = &expression_parsers[token.type];
4626 if(parser->infix_parser == NULL)
4628 if(parser->infix_precedence < precedence)
4631 left = parser->infix_parser(parser->infix_precedence, left);
4633 assert(left != NULL);
4634 assert(left->kind != EXPR_UNKNOWN);
4635 left->base.source_position = source_position;
4642 * Parse an expression.
4644 static expression_t *parse_expression(void)
4646 return parse_sub_expression(1);
4650 * Register a parser for a prefix-like operator with given precedence.
4652 * @param parser the parser function
4653 * @param token_type the token type of the prefix token
4654 * @param precedence the precedence of the operator
4656 static void register_expression_parser(parse_expression_function parser,
4657 int token_type, unsigned precedence)
4659 expression_parser_function_t *entry = &expression_parsers[token_type];
4661 if(entry->parser != NULL) {
4662 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4663 panic("trying to register multiple expression parsers for a token");
4665 entry->parser = parser;
4666 entry->precedence = precedence;
4670 * Register a parser for an infix operator with given precedence.
4672 * @param parser the parser function
4673 * @param token_type the token type of the infix operator
4674 * @param precedence the precedence of the operator
4676 static void register_infix_parser(parse_expression_infix_function parser,
4677 int token_type, unsigned precedence)
4679 expression_parser_function_t *entry = &expression_parsers[token_type];
4681 if(entry->infix_parser != NULL) {
4682 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4683 panic("trying to register multiple infix expression parsers for a "
4686 entry->infix_parser = parser;
4687 entry->infix_precedence = precedence;
4691 * Initialize the expression parsers.
4693 static void init_expression_parsers(void)
4695 memset(&expression_parsers, 0, sizeof(expression_parsers));
4697 register_infix_parser(parse_array_expression, '[', 30);
4698 register_infix_parser(parse_call_expression, '(', 30);
4699 register_infix_parser(parse_select_expression, '.', 30);
4700 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4701 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4703 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4706 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4707 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4708 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4709 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4710 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4711 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4712 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4713 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4714 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4715 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4716 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4717 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4718 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4719 T_EXCLAMATIONMARKEQUAL, 13);
4720 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4721 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4722 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4723 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4724 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4725 register_infix_parser(parse_conditional_expression, '?', 7);
4726 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4727 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4728 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4729 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4730 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4731 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4732 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4733 T_LESSLESSEQUAL, 2);
4734 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4735 T_GREATERGREATEREQUAL, 2);
4736 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4738 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4740 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4743 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4745 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4746 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4747 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4748 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4749 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4750 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4751 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4753 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4755 register_expression_parser(parse_sizeof, T_sizeof, 25);
4756 register_expression_parser(parse_extension, T___extension__, 25);
4757 register_expression_parser(parse_builtin_classify_type,
4758 T___builtin_classify_type, 25);
4762 * Parse a asm statement constraints specification.
4764 static asm_constraint_t *parse_asm_constraints(void)
4766 asm_constraint_t *result = NULL;
4767 asm_constraint_t *last = NULL;
4769 while(token.type == T_STRING_LITERAL || token.type == '[') {
4770 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4771 memset(constraint, 0, sizeof(constraint[0]));
4773 if(token.type == '[') {
4775 if(token.type != T_IDENTIFIER) {
4776 parse_error_expected("while parsing asm constraint",
4780 constraint->symbol = token.v.symbol;
4785 constraint->constraints = parse_string_literals();
4787 constraint->expression = parse_expression();
4791 last->next = constraint;
4793 result = constraint;
4797 if(token.type != ',')
4806 * Parse a asm statement clobber specification.
4808 static asm_clobber_t *parse_asm_clobbers(void)
4810 asm_clobber_t *result = NULL;
4811 asm_clobber_t *last = NULL;
4813 while(token.type == T_STRING_LITERAL) {
4814 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4815 clobber->clobber = parse_string_literals();
4818 last->next = clobber;
4824 if(token.type != ',')
4833 * Parse an asm statement.
4835 static statement_t *parse_asm_statement(void)
4839 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4840 statement->base.source_position = token.source_position;
4842 asm_statement_t *asm_statement = &statement->asms;
4844 if(token.type == T_volatile) {
4846 asm_statement->is_volatile = true;
4850 asm_statement->asm_text = parse_string_literals();
4852 if(token.type != ':')
4856 asm_statement->inputs = parse_asm_constraints();
4857 if(token.type != ':')
4861 asm_statement->outputs = parse_asm_constraints();
4862 if(token.type != ':')
4866 asm_statement->clobbers = parse_asm_clobbers();
4875 * Parse a case statement.
4877 static statement_t *parse_case_statement(void)
4881 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4883 statement->base.source_position = token.source_position;
4884 statement->case_label.expression = parse_expression();
4888 if (! is_constant_expression(statement->case_label.expression)) {
4889 errorf(statement->base.source_position,
4890 "case label does not reduce to an integer constant");
4892 /* TODO: check if the case label is already known */
4893 if (current_switch != NULL) {
4894 /* link all cases into the switch statement */
4895 if (current_switch->last_case == NULL) {
4896 current_switch->first_case =
4897 current_switch->last_case = &statement->case_label;
4899 current_switch->last_case->next = &statement->case_label;
4902 errorf(statement->base.source_position,
4903 "case label not within a switch statement");
4906 statement->case_label.label_statement = parse_statement();
4912 * Finds an existing default label of a switch statement.
4914 static case_label_statement_t *
4915 find_default_label(const switch_statement_t *statement)
4917 for (case_label_statement_t *label = statement->first_case;
4919 label = label->next) {
4920 if (label->expression == NULL)
4927 * Parse a default statement.
4929 static statement_t *parse_default_statement(void)
4933 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4935 statement->base.source_position = token.source_position;
4938 if (current_switch != NULL) {
4939 const case_label_statement_t *def_label = find_default_label(current_switch);
4940 if (def_label != NULL) {
4941 errorf(HERE, "multiple default labels in one switch");
4942 errorf(def_label->statement.source_position,
4943 "this is the first default label");
4945 /* link all cases into the switch statement */
4946 if (current_switch->last_case == NULL) {
4947 current_switch->first_case =
4948 current_switch->last_case = &statement->case_label;
4950 current_switch->last_case->next = &statement->case_label;
4954 errorf(statement->base.source_position,
4955 "'default' label not within a switch statement");
4957 statement->label.label_statement = parse_statement();
4963 * Return the declaration for a given label symbol or create a new one.
4965 static declaration_t *get_label(symbol_t *symbol)
4967 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4968 assert(current_function != NULL);
4969 /* if we found a label in the same function, then we already created the
4971 if(candidate != NULL
4972 && candidate->parent_context == ¤t_function->context) {
4976 /* otherwise we need to create a new one */
4977 declaration_t *const declaration = allocate_declaration_zero();
4978 declaration->namespc = NAMESPACE_LABEL;
4979 declaration->symbol = symbol;
4981 label_push(declaration);
4987 * Parse a label statement.
4989 static statement_t *parse_label_statement(void)
4991 assert(token.type == T_IDENTIFIER);
4992 symbol_t *symbol = token.v.symbol;
4995 declaration_t *label = get_label(symbol);
4997 /* if source position is already set then the label is defined twice,
4998 * otherwise it was just mentioned in a goto so far */
4999 if(label->source_position.input_name != NULL) {
5000 errorf(HERE, "duplicate label '%Y'", symbol);
5001 errorf(label->source_position, "previous definition of '%Y' was here",
5004 label->source_position = token.source_position;
5007 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
5009 label_statement->statement.kind = STATEMENT_LABEL;
5010 label_statement->statement.source_position = token.source_position;
5011 label_statement->label = label;
5015 if(token.type == '}') {
5016 /* TODO only warn? */
5017 errorf(HERE, "label at end of compound statement");
5018 return (statement_t*) label_statement;
5020 label_statement->label_statement = parse_statement();
5023 return (statement_t*) label_statement;
5027 * Parse an if statement.
5029 static statement_t *parse_if(void)
5033 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5034 statement->statement.kind = STATEMENT_IF;
5035 statement->statement.source_position = token.source_position;
5038 statement->condition = parse_expression();
5041 statement->true_statement = parse_statement();
5042 if(token.type == T_else) {
5044 statement->false_statement = parse_statement();
5047 return (statement_t*) statement;
5051 * Parse a switch statement.
5053 static statement_t *parse_switch(void)
5057 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5058 statement->statement.kind = STATEMENT_SWITCH;
5059 statement->statement.source_position = token.source_position;
5062 expression_t *const expr = parse_expression();
5063 type_t * type = skip_typeref(expr->base.datatype);
5064 if (is_type_integer(type)) {
5065 type = promote_integer(type);
5066 } else if (is_type_valid(type)) {
5067 errorf(expr->base.source_position, "switch quantity is not an integer, but '%T'", type);
5068 type = type_error_type;
5070 statement->expression = create_implicit_cast(expr, type);
5073 switch_statement_t *rem = current_switch;
5074 current_switch = statement;
5075 statement->body = parse_statement();
5076 current_switch = rem;
5078 if (warning.switch_default && find_default_label(statement) == NULL) {
5079 warningf(statement->statement.source_position, "switch has no default case");
5082 return (statement_t*) statement;
5085 static statement_t *parse_loop_body(statement_t *const loop)
5087 statement_t *const rem = current_loop;
5088 current_loop = loop;
5089 statement_t *const body = parse_statement();
5095 * Parse a while statement.
5097 static statement_t *parse_while(void)
5101 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5102 statement->statement.kind = STATEMENT_WHILE;
5103 statement->statement.source_position = token.source_position;
5106 statement->condition = parse_expression();
5109 statement->body = parse_loop_body((statement_t*)statement);
5111 return (statement_t*) statement;
5115 * Parse a do statement.
5117 static statement_t *parse_do(void)
5121 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5122 statement->statement.kind = STATEMENT_DO_WHILE;
5123 statement->statement.source_position = token.source_position;
5125 statement->body = parse_loop_body((statement_t*)statement);
5128 statement->condition = parse_expression();
5132 return (statement_t*) statement;
5136 * Parse a for statement.
5138 static statement_t *parse_for(void)
5142 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5143 statement->statement.kind = STATEMENT_FOR;
5144 statement->statement.source_position = token.source_position;
5148 int top = environment_top();
5149 context_t *last_context = context;
5150 set_context(&statement->context);
5152 if(token.type != ';') {
5153 if(is_declaration_specifier(&token, false)) {
5154 parse_declaration(record_declaration);
5156 statement->initialisation = parse_expression();
5163 if(token.type != ';') {
5164 statement->condition = parse_expression();
5167 if(token.type != ')') {
5168 statement->step = parse_expression();
5171 statement->body = parse_loop_body((statement_t*)statement);
5173 assert(context == &statement->context);
5174 set_context(last_context);
5175 environment_pop_to(top);
5177 return (statement_t*) statement;
5181 * Parse a goto statement.
5183 static statement_t *parse_goto(void)
5187 if(token.type != T_IDENTIFIER) {
5188 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5192 symbol_t *symbol = token.v.symbol;
5195 declaration_t *label = get_label(symbol);
5197 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5199 statement->statement.kind = STATEMENT_GOTO;
5200 statement->statement.source_position = token.source_position;
5202 statement->label = label;
5204 /* remember the goto's in a list for later checking */
5205 if (goto_last == NULL) {
5206 goto_first = goto_last = statement;
5208 goto_last->next = statement;
5213 return (statement_t*) statement;
5217 * Parse a continue statement.
5219 static statement_t *parse_continue(void)
5221 statement_t *statement;
5222 if (current_loop == NULL) {
5223 errorf(HERE, "continue statement not within loop");
5226 statement = allocate_statement_zero(STATEMENT_CONTINUE);
5228 statement->base.source_position = token.source_position;
5238 * Parse a break statement.
5240 static statement_t *parse_break(void)
5242 statement_t *statement;
5243 if (current_switch == NULL && current_loop == NULL) {
5244 errorf(HERE, "break statement not within loop or switch");
5247 statement = allocate_statement_zero(STATEMENT_BREAK);
5249 statement->base.source_position = token.source_position;
5259 * Check if a given declaration represents a local variable.
5261 static bool is_local_var_declaration(const declaration_t *declaration) {
5262 switch ((storage_class_tag_t) declaration->storage_class) {
5263 case STORAGE_CLASS_NONE:
5264 case STORAGE_CLASS_AUTO:
5265 case STORAGE_CLASS_REGISTER: {
5266 const type_t *type = skip_typeref(declaration->type);
5267 if(is_type_function(type)) {
5279 * Check if a given expression represents a local variable.
5281 static bool is_local_variable(const expression_t *expression)
5283 if (expression->base.kind != EXPR_REFERENCE) {
5286 const declaration_t *declaration = expression->reference.declaration;
5287 return is_local_var_declaration(declaration);
5291 * Parse a return statement.
5293 static statement_t *parse_return(void)
5297 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5299 statement->statement.kind = STATEMENT_RETURN;
5300 statement->statement.source_position = token.source_position;
5302 expression_t *return_value = NULL;
5303 if(token.type != ';') {
5304 return_value = parse_expression();
5308 const type_t *const func_type = current_function->type;
5309 assert(is_type_function(func_type));
5310 type_t *const return_type = skip_typeref(func_type->function.return_type);
5312 if(return_value != NULL) {
5313 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5315 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5316 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5317 warningf(statement->statement.source_position,
5318 "'return' with a value, in function returning void");
5319 return_value = NULL;
5321 type_t *const res_type = semantic_assign(return_type,
5322 return_value, "'return'");
5323 if (res_type == NULL) {
5324 errorf(statement->statement.source_position,
5325 "cannot return something of type '%T' in function returning '%T'",
5326 return_value->base.datatype, return_type);
5328 return_value = create_implicit_cast(return_value, res_type);
5331 /* check for returning address of a local var */
5332 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
5333 const expression_t *expression = return_value->unary.value;
5334 if (is_local_variable(expression)) {
5335 warningf(statement->statement.source_position,
5336 "function returns address of local variable");
5340 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5341 warningf(statement->statement.source_position,
5342 "'return' without value, in function returning non-void");
5345 statement->return_value = return_value;
5347 return (statement_t*) statement;
5351 * Parse a declaration statement.
5353 static statement_t *parse_declaration_statement(void)
5355 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5357 statement->base.source_position = token.source_position;
5359 declaration_t *before = last_declaration;
5360 parse_declaration(record_declaration);
5362 if(before == NULL) {
5363 statement->declaration.declarations_begin = context->declarations;
5365 statement->declaration.declarations_begin = before->next;
5367 statement->declaration.declarations_end = last_declaration;
5373 * Parse an expression statement, ie. expr ';'.
5375 static statement_t *parse_expression_statement(void)
5377 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5379 statement->base.source_position = token.source_position;
5380 expression_t *const expr = parse_expression();
5381 statement->expression.expression = expr;
5383 if (warning.unused_value && !expression_has_effect(expr)) {
5384 warningf(expr->base.source_position, "statement has no effect");
5393 * Parse a statement.
5395 static statement_t *parse_statement(void)
5397 statement_t *statement = NULL;
5399 /* declaration or statement */
5400 switch(token.type) {
5402 statement = parse_asm_statement();
5406 statement = parse_case_statement();
5410 statement = parse_default_statement();
5414 statement = parse_compound_statement();
5418 statement = parse_if();
5422 statement = parse_switch();
5426 statement = parse_while();
5430 statement = parse_do();
5434 statement = parse_for();
5438 statement = parse_goto();
5442 statement = parse_continue();
5446 statement = parse_break();
5450 statement = parse_return();
5454 if (warning.empty_statement) {
5455 warningf(HERE, "statement is empty");
5462 if(look_ahead(1)->type == ':') {
5463 statement = parse_label_statement();
5467 if(is_typedef_symbol(token.v.symbol)) {
5468 statement = parse_declaration_statement();
5472 statement = parse_expression_statement();
5475 case T___extension__:
5476 /* this can be a prefix to a declaration or an expression statement */
5477 /* we simply eat it now and parse the rest with tail recursion */
5480 } while(token.type == T___extension__);
5481 statement = parse_statement();
5485 statement = parse_declaration_statement();
5489 statement = parse_expression_statement();
5493 assert(statement == NULL
5494 || statement->base.source_position.input_name != NULL);
5500 * Parse a compound statement.
5502 static statement_t *parse_compound_statement(void)
5504 compound_statement_t *const compound_statement
5505 = allocate_ast_zero(sizeof(compound_statement[0]));
5506 compound_statement->statement.kind = STATEMENT_COMPOUND;
5507 compound_statement->statement.source_position = token.source_position;
5511 int top = environment_top();
5512 context_t *last_context = context;
5513 set_context(&compound_statement->context);
5515 statement_t *last_statement = NULL;
5517 while(token.type != '}' && token.type != T_EOF) {
5518 statement_t *statement = parse_statement();
5519 if(statement == NULL)
5522 if(last_statement != NULL) {
5523 last_statement->base.next = statement;
5525 compound_statement->statements = statement;
5528 while(statement->base.next != NULL)
5529 statement = statement->base.next;
5531 last_statement = statement;
5534 if(token.type == '}') {
5537 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5540 assert(context == &compound_statement->context);
5541 set_context(last_context);
5542 environment_pop_to(top);
5544 return (statement_t*) compound_statement;
5548 * Initialize builtin types.
5550 static void initialize_builtin_types(void)
5552 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5553 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5554 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5555 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5556 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5557 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5558 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5559 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5561 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5562 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5563 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5564 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5568 * Parse a translation unit.
5570 static translation_unit_t *parse_translation_unit(void)
5572 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5574 assert(global_context == NULL);
5575 global_context = &unit->context;
5577 assert(context == NULL);
5578 set_context(&unit->context);
5580 initialize_builtin_types();
5582 while(token.type != T_EOF) {
5583 if (token.type == ';') {
5584 /* TODO error in strict mode */
5585 warningf(HERE, "stray ';' outside of function");
5588 parse_external_declaration();
5592 assert(context == &unit->context);
5594 last_declaration = NULL;
5596 assert(global_context == &unit->context);
5597 global_context = NULL;
5605 * @return the translation unit or NULL if errors occurred.
5607 translation_unit_t *parse(void)
5609 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5610 label_stack = NEW_ARR_F(stack_entry_t, 0);
5611 diagnostic_count = 0;
5615 type_set_output(stderr);
5616 ast_set_output(stderr);
5618 lookahead_bufpos = 0;
5619 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5622 translation_unit_t *unit = parse_translation_unit();
5624 DEL_ARR_F(environment_stack);
5625 DEL_ARR_F(label_stack);
5634 * Initialize the parser.
5636 void init_parser(void)
5638 init_expression_parsers();
5639 obstack_init(&temp_obst);
5641 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5642 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5646 * Terminate the parser.
5648 void exit_parser(void)
5650 obstack_free(&temp_obst, NULL);