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);
988 static initializer_t *parse_sub_initializer_elem(type_t *type)
990 if(token.type == '{') {
991 return parse_sub_initializer(type, NULL);
994 expression_t *expression = parse_assignment_expression();
995 return parse_sub_initializer(type, expression);
998 static bool had_initializer_brace_warning;
1000 static void skip_designator(void)
1003 if(token.type == '.') {
1005 if(token.type == T_IDENTIFIER)
1007 } else if(token.type == '[') {
1009 parse_constant_expression();
1010 if(token.type == ']')
1018 static initializer_t *parse_sub_initializer(type_t *type,
1019 expression_t *expression)
1021 if(is_type_scalar(type)) {
1022 /* there might be extra {} hierarchies */
1023 if(token.type == '{') {
1025 if(!had_initializer_brace_warning) {
1026 warningf(HERE, "braces around scalar initializer");
1027 had_initializer_brace_warning = true;
1029 initializer_t *result = parse_sub_initializer(type, NULL);
1030 if(token.type == ',') {
1032 /* TODO: warn about excessive elements */
1038 if(expression == NULL) {
1039 expression = parse_assignment_expression();
1041 return initializer_from_expression(type, expression);
1044 /* does the expression match the currently looked at object to initialize */
1045 if(expression != NULL) {
1046 initializer_t *result = initializer_from_expression(type, expression);
1051 bool read_paren = false;
1052 if(token.type == '{') {
1057 /* descend into subtype */
1058 initializer_t *result = NULL;
1059 initializer_t **elems;
1060 if(is_type_array(type)) {
1061 if(token.type == '.') {
1063 "compound designator in initializer for array type '%T'",
1068 type_t *const element_type = skip_typeref(type->array.element_type);
1071 had_initializer_brace_warning = false;
1072 if(expression == NULL) {
1073 sub = parse_sub_initializer_elem(element_type);
1075 sub = parse_sub_initializer(element_type, expression);
1078 /* didn't match the subtypes -> try the parent type */
1080 assert(!read_paren);
1084 elems = NEW_ARR_F(initializer_t*, 0);
1085 ARR_APP1(initializer_t*, elems, sub);
1088 if(token.type == '}')
1091 if(token.type == '}')
1094 sub = parse_sub_initializer_elem(element_type);
1096 /* TODO error, do nicer cleanup */
1097 errorf(HERE, "member initializer didn't match");
1101 ARR_APP1(initializer_t*, elems, sub);
1104 assert(is_type_compound(type));
1105 context_t *const context = &type->compound.declaration->context;
1107 if(token.type == '[') {
1109 "array designator in initializer for compound type '%T'",
1114 declaration_t *first = context->declarations;
1117 type_t *first_type = first->type;
1118 first_type = skip_typeref(first_type);
1121 had_initializer_brace_warning = false;
1122 if(expression == NULL) {
1123 sub = parse_sub_initializer_elem(first_type);
1125 sub = parse_sub_initializer(first_type, expression);
1128 /* didn't match the subtypes -> try our parent type */
1130 assert(!read_paren);
1134 elems = NEW_ARR_F(initializer_t*, 0);
1135 ARR_APP1(initializer_t*, elems, sub);
1137 declaration_t *iter = first->next;
1138 for( ; iter != NULL; iter = iter->next) {
1139 if(iter->symbol == NULL)
1141 if(iter->namespc != NAMESPACE_NORMAL)
1144 if(token.type == '}')
1147 if(token.type == '}')
1150 type_t *iter_type = iter->type;
1151 iter_type = skip_typeref(iter_type);
1153 sub = parse_sub_initializer_elem(iter_type);
1155 /* TODO error, do nicer cleanup */
1156 errorf(HERE, "member initializer didn't match");
1160 ARR_APP1(initializer_t*, elems, sub);
1164 int len = ARR_LEN(elems);
1165 size_t elems_size = sizeof(initializer_t*) * len;
1167 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1169 init->initializer.kind = INITIALIZER_LIST;
1171 memcpy(init->initializers, elems, elems_size);
1174 result = (initializer_t*) init;
1177 if(token.type == ',')
1184 static initializer_t *parse_initializer(type_t *const orig_type)
1186 initializer_t *result;
1188 type_t *const type = skip_typeref(orig_type);
1190 if(token.type != '{') {
1191 expression_t *expression = parse_assignment_expression();
1192 initializer_t *initializer = initializer_from_expression(type, expression);
1193 if(initializer == NULL) {
1195 "initializer expression '%E' of type '%T' is incompatible with type '%T'",
1196 expression, expression->base.datatype, orig_type);
1201 if(is_type_scalar(type)) {
1205 expression_t *expression = parse_assignment_expression();
1206 result = initializer_from_expression(type, expression);
1208 if(token.type == ',')
1214 result = parse_sub_initializer(type, NULL);
1220 static declaration_t *append_declaration(declaration_t *declaration);
1222 static declaration_t *parse_compound_type_specifier(bool is_struct)
1230 symbol_t *symbol = NULL;
1231 declaration_t *declaration = NULL;
1233 if (token.type == T___attribute__) {
1238 if(token.type == T_IDENTIFIER) {
1239 symbol = token.v.symbol;
1243 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1245 declaration = get_declaration(symbol, NAMESPACE_UNION);
1247 } else if(token.type != '{') {
1249 parse_error_expected("while parsing struct type specifier",
1250 T_IDENTIFIER, '{', 0);
1252 parse_error_expected("while parsing union type specifier",
1253 T_IDENTIFIER, '{', 0);
1259 if(declaration == NULL) {
1260 declaration = allocate_declaration_zero();
1261 declaration->namespc =
1262 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
1263 declaration->source_position = token.source_position;
1264 declaration->symbol = symbol;
1265 declaration->parent_context = context;
1266 if (symbol != NULL) {
1267 environment_push(declaration);
1269 append_declaration(declaration);
1272 if(token.type == '{') {
1273 if(declaration->init.is_defined) {
1274 assert(symbol != NULL);
1275 errorf(HERE, "multiple definition of '%s %Y'",
1276 is_struct ? "struct" : "union", symbol);
1277 declaration->context.declarations = NULL;
1279 declaration->init.is_defined = true;
1281 int top = environment_top();
1282 context_t *last_context = context;
1283 set_context(&declaration->context);
1285 parse_compound_type_entries();
1288 assert(context == &declaration->context);
1289 set_context(last_context);
1290 environment_pop_to(top);
1296 static void parse_enum_entries(type_t *const enum_type)
1300 if(token.type == '}') {
1302 errorf(HERE, "empty enum not allowed");
1307 if(token.type != T_IDENTIFIER) {
1308 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1313 declaration_t *const entry = allocate_declaration_zero();
1314 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1315 entry->type = enum_type;
1316 entry->symbol = token.v.symbol;
1317 entry->source_position = token.source_position;
1320 if(token.type == '=') {
1322 entry->init.enum_value = parse_constant_expression();
1327 record_declaration(entry);
1329 if(token.type != ',')
1332 } while(token.type != '}');
1337 static type_t *parse_enum_specifier(void)
1341 declaration_t *declaration;
1344 if(token.type == T_IDENTIFIER) {
1345 symbol = token.v.symbol;
1348 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1349 } else if(token.type != '{') {
1350 parse_error_expected("while parsing enum type specifier",
1351 T_IDENTIFIER, '{', 0);
1358 if(declaration == NULL) {
1359 declaration = allocate_declaration_zero();
1360 declaration->namespc = NAMESPACE_ENUM;
1361 declaration->source_position = token.source_position;
1362 declaration->symbol = symbol;
1363 declaration->parent_context = context;
1366 type_t *const type = allocate_type_zero(TYPE_ENUM);
1367 type->enumt.declaration = declaration;
1369 if(token.type == '{') {
1370 if(declaration->init.is_defined) {
1371 errorf(HERE, "multiple definitions of enum %Y", symbol);
1373 if (symbol != NULL) {
1374 environment_push(declaration);
1376 append_declaration(declaration);
1377 declaration->init.is_defined = 1;
1379 parse_enum_entries(type);
1387 * if a symbol is a typedef to another type, return true
1389 static bool is_typedef_symbol(symbol_t *symbol)
1391 const declaration_t *const declaration =
1392 get_declaration(symbol, NAMESPACE_NORMAL);
1394 declaration != NULL &&
1395 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1398 static type_t *parse_typeof(void)
1406 expression_t *expression = NULL;
1409 switch(token.type) {
1410 case T___extension__:
1411 /* this can be a prefix to a typename or an expression */
1412 /* we simply eat it now. */
1415 } while(token.type == T___extension__);
1419 if(is_typedef_symbol(token.v.symbol)) {
1420 type = parse_typename();
1422 expression = parse_expression();
1423 type = expression->base.datatype;
1428 type = parse_typename();
1432 expression = parse_expression();
1433 type = expression->base.datatype;
1439 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1440 typeof_type->typeoft.expression = expression;
1441 typeof_type->typeoft.typeof_type = type;
1447 SPECIFIER_SIGNED = 1 << 0,
1448 SPECIFIER_UNSIGNED = 1 << 1,
1449 SPECIFIER_LONG = 1 << 2,
1450 SPECIFIER_INT = 1 << 3,
1451 SPECIFIER_DOUBLE = 1 << 4,
1452 SPECIFIER_CHAR = 1 << 5,
1453 SPECIFIER_SHORT = 1 << 6,
1454 SPECIFIER_LONG_LONG = 1 << 7,
1455 SPECIFIER_FLOAT = 1 << 8,
1456 SPECIFIER_BOOL = 1 << 9,
1457 SPECIFIER_VOID = 1 << 10,
1458 #ifdef PROVIDE_COMPLEX
1459 SPECIFIER_COMPLEX = 1 << 11,
1460 SPECIFIER_IMAGINARY = 1 << 12,
1464 static type_t *create_builtin_type(symbol_t *const symbol,
1465 type_t *const real_type)
1467 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1468 type->builtin.symbol = symbol;
1469 type->builtin.real_type = real_type;
1471 type_t *result = typehash_insert(type);
1472 if (type != result) {
1479 static type_t *get_typedef_type(symbol_t *symbol)
1481 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1482 if(declaration == NULL
1483 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1486 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1487 type->typedeft.declaration = declaration;
1492 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1494 type_t *type = NULL;
1495 unsigned type_qualifiers = 0;
1496 unsigned type_specifiers = 0;
1499 specifiers->source_position = token.source_position;
1502 switch(token.type) {
1505 #define MATCH_STORAGE_CLASS(token, class) \
1507 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1508 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1510 specifiers->storage_class = class; \
1514 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1515 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1516 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1517 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1518 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1521 switch (specifiers->storage_class) {
1522 case STORAGE_CLASS_NONE:
1523 specifiers->storage_class = STORAGE_CLASS_THREAD;
1526 case STORAGE_CLASS_EXTERN:
1527 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1530 case STORAGE_CLASS_STATIC:
1531 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1535 errorf(HERE, "multiple storage classes in declaration specifiers");
1541 /* type qualifiers */
1542 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1544 type_qualifiers |= qualifier; \
1548 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1549 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1550 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1552 case T___extension__:
1557 /* type specifiers */
1558 #define MATCH_SPECIFIER(token, specifier, name) \
1561 if(type_specifiers & specifier) { \
1562 errorf(HERE, "multiple " name " type specifiers given"); \
1564 type_specifiers |= specifier; \
1568 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1569 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1570 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1571 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1572 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1573 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1574 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1575 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1576 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1577 #ifdef PROVIDE_COMPLEX
1578 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1579 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1582 /* only in microsoft mode */
1583 specifiers->decl_modifiers |= DM_FORCEINLINE;
1587 specifiers->is_inline = true;
1592 if(type_specifiers & SPECIFIER_LONG_LONG) {
1593 errorf(HERE, "multiple type specifiers given");
1594 } else if(type_specifiers & SPECIFIER_LONG) {
1595 type_specifiers |= SPECIFIER_LONG_LONG;
1597 type_specifiers |= SPECIFIER_LONG;
1601 /* TODO: if is_type_valid(type) for the following rules should issue
1604 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1606 type->compound.declaration = parse_compound_type_specifier(true);
1610 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1612 type->compound.declaration = parse_compound_type_specifier(false);
1616 type = parse_enum_specifier();
1619 type = parse_typeof();
1621 case T___builtin_va_list:
1622 type = duplicate_type(type_valist);
1626 case T___attribute__:
1631 case T_IDENTIFIER: {
1632 type_t *typedef_type = get_typedef_type(token.v.symbol);
1634 if(typedef_type == NULL)
1635 goto finish_specifiers;
1638 type = typedef_type;
1642 /* function specifier */
1644 goto finish_specifiers;
1651 atomic_type_kind_t atomic_type;
1653 /* match valid basic types */
1654 switch(type_specifiers) {
1655 case SPECIFIER_VOID:
1656 atomic_type = ATOMIC_TYPE_VOID;
1658 case SPECIFIER_CHAR:
1659 atomic_type = ATOMIC_TYPE_CHAR;
1661 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1662 atomic_type = ATOMIC_TYPE_SCHAR;
1664 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1665 atomic_type = ATOMIC_TYPE_UCHAR;
1667 case SPECIFIER_SHORT:
1668 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1669 case SPECIFIER_SHORT | SPECIFIER_INT:
1670 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1671 atomic_type = ATOMIC_TYPE_SHORT;
1673 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1674 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1675 atomic_type = ATOMIC_TYPE_USHORT;
1678 case SPECIFIER_SIGNED:
1679 case SPECIFIER_SIGNED | SPECIFIER_INT:
1680 atomic_type = ATOMIC_TYPE_INT;
1682 case SPECIFIER_UNSIGNED:
1683 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1684 atomic_type = ATOMIC_TYPE_UINT;
1686 case SPECIFIER_LONG:
1687 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1688 case SPECIFIER_LONG | SPECIFIER_INT:
1689 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1690 atomic_type = ATOMIC_TYPE_LONG;
1692 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1693 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1694 atomic_type = ATOMIC_TYPE_ULONG;
1696 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1697 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1698 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1699 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1701 atomic_type = ATOMIC_TYPE_LONGLONG;
1703 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1704 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1706 atomic_type = ATOMIC_TYPE_ULONGLONG;
1708 case SPECIFIER_FLOAT:
1709 atomic_type = ATOMIC_TYPE_FLOAT;
1711 case SPECIFIER_DOUBLE:
1712 atomic_type = ATOMIC_TYPE_DOUBLE;
1714 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1715 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1717 case SPECIFIER_BOOL:
1718 atomic_type = ATOMIC_TYPE_BOOL;
1720 #ifdef PROVIDE_COMPLEX
1721 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1722 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1724 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1725 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1727 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1728 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1730 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1731 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1733 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1734 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1736 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1737 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1741 /* invalid specifier combination, give an error message */
1742 if(type_specifiers == 0) {
1743 if (! strict_mode) {
1744 if (warning.implicit_int) {
1745 warningf(HERE, "no type specifiers in declaration, using 'int'");
1747 atomic_type = ATOMIC_TYPE_INT;
1750 errorf(HERE, "no type specifiers given in declaration");
1752 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1753 (type_specifiers & SPECIFIER_UNSIGNED)) {
1754 errorf(HERE, "signed and unsigned specifiers gives");
1755 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1756 errorf(HERE, "only integer types can be signed or unsigned");
1758 errorf(HERE, "multiple datatypes in declaration");
1760 atomic_type = ATOMIC_TYPE_INVALID;
1763 type = allocate_type_zero(TYPE_ATOMIC);
1764 type->atomic.akind = atomic_type;
1767 if(type_specifiers != 0) {
1768 errorf(HERE, "multiple datatypes in declaration");
1772 type->base.qualifiers = type_qualifiers;
1774 type_t *result = typehash_insert(type);
1775 if(newtype && result != type) {
1779 specifiers->type = result;
1782 static type_qualifiers_t parse_type_qualifiers(void)
1784 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1787 switch(token.type) {
1788 /* type qualifiers */
1789 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1790 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1791 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1794 return type_qualifiers;
1799 static declaration_t *parse_identifier_list(void)
1801 declaration_t *declarations = NULL;
1802 declaration_t *last_declaration = NULL;
1804 declaration_t *const declaration = allocate_declaration_zero();
1805 declaration->source_position = token.source_position;
1806 declaration->symbol = token.v.symbol;
1809 if(last_declaration != NULL) {
1810 last_declaration->next = declaration;
1812 declarations = declaration;
1814 last_declaration = declaration;
1816 if(token.type != ',')
1819 } while(token.type == T_IDENTIFIER);
1821 return declarations;
1824 static void semantic_parameter(declaration_t *declaration)
1826 /* TODO: improve error messages */
1828 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1829 errorf(HERE, "typedef not allowed in parameter list");
1830 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1831 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1832 errorf(HERE, "parameter may only have none or register storage class");
1835 type_t *const orig_type = declaration->type;
1836 type_t * type = skip_typeref(orig_type);
1838 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1839 * into a pointer. § 6.7.5.3 (7) */
1840 if (is_type_array(type)) {
1841 type_t *const element_type = type->array.element_type;
1843 type = make_pointer_type(element_type, type->base.qualifiers);
1845 declaration->type = type;
1848 if(is_type_incomplete(type)) {
1849 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1850 orig_type, declaration->symbol);
1854 static declaration_t *parse_parameter(void)
1856 declaration_specifiers_t specifiers;
1857 memset(&specifiers, 0, sizeof(specifiers));
1859 parse_declaration_specifiers(&specifiers);
1861 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1863 semantic_parameter(declaration);
1868 static declaration_t *parse_parameters(function_type_t *type)
1870 if(token.type == T_IDENTIFIER) {
1871 symbol_t *symbol = token.v.symbol;
1872 if(!is_typedef_symbol(symbol)) {
1873 type->kr_style_parameters = true;
1874 return parse_identifier_list();
1878 if(token.type == ')') {
1879 type->unspecified_parameters = 1;
1882 if(token.type == T_void && look_ahead(1)->type == ')') {
1887 declaration_t *declarations = NULL;
1888 declaration_t *declaration;
1889 declaration_t *last_declaration = NULL;
1890 function_parameter_t *parameter;
1891 function_parameter_t *last_parameter = NULL;
1894 switch(token.type) {
1898 return declarations;
1901 case T___extension__:
1903 declaration = parse_parameter();
1905 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1906 memset(parameter, 0, sizeof(parameter[0]));
1907 parameter->type = declaration->type;
1909 if(last_parameter != NULL) {
1910 last_declaration->next = declaration;
1911 last_parameter->next = parameter;
1913 type->parameters = parameter;
1914 declarations = declaration;
1916 last_parameter = parameter;
1917 last_declaration = declaration;
1921 return declarations;
1923 if(token.type != ',')
1924 return declarations;
1934 } construct_type_type_t;
1936 typedef struct construct_type_t construct_type_t;
1937 struct construct_type_t {
1938 construct_type_type_t type;
1939 construct_type_t *next;
1942 typedef struct parsed_pointer_t parsed_pointer_t;
1943 struct parsed_pointer_t {
1944 construct_type_t construct_type;
1945 type_qualifiers_t type_qualifiers;
1948 typedef struct construct_function_type_t construct_function_type_t;
1949 struct construct_function_type_t {
1950 construct_type_t construct_type;
1951 type_t *function_type;
1954 typedef struct parsed_array_t parsed_array_t;
1955 struct parsed_array_t {
1956 construct_type_t construct_type;
1957 type_qualifiers_t type_qualifiers;
1963 typedef struct construct_base_type_t construct_base_type_t;
1964 struct construct_base_type_t {
1965 construct_type_t construct_type;
1969 static construct_type_t *parse_pointer_declarator(void)
1973 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
1974 memset(pointer, 0, sizeof(pointer[0]));
1975 pointer->construct_type.type = CONSTRUCT_POINTER;
1976 pointer->type_qualifiers = parse_type_qualifiers();
1978 return (construct_type_t*) pointer;
1981 static construct_type_t *parse_array_declarator(void)
1985 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
1986 memset(array, 0, sizeof(array[0]));
1987 array->construct_type.type = CONSTRUCT_ARRAY;
1989 if(token.type == T_static) {
1990 array->is_static = true;
1994 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
1995 if(type_qualifiers != 0) {
1996 if(token.type == T_static) {
1997 array->is_static = true;
2001 array->type_qualifiers = type_qualifiers;
2003 if(token.type == '*' && look_ahead(1)->type == ']') {
2004 array->is_variable = true;
2006 } else if(token.type != ']') {
2007 array->size = parse_assignment_expression();
2012 return (construct_type_t*) array;
2015 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2019 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2021 declaration_t *parameters = parse_parameters(&type->function);
2022 if(declaration != NULL) {
2023 declaration->context.declarations = parameters;
2026 construct_function_type_t *construct_function_type =
2027 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2028 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2029 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2030 construct_function_type->function_type = type;
2034 return (construct_type_t*) construct_function_type;
2037 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2038 bool may_be_abstract)
2040 /* construct a single linked list of construct_type_t's which describe
2041 * how to construct the final declarator type */
2042 construct_type_t *first = NULL;
2043 construct_type_t *last = NULL;
2046 while(token.type == '*') {
2047 construct_type_t *type = parse_pointer_declarator();
2058 /* TODO: find out if this is correct */
2061 construct_type_t *inner_types = NULL;
2063 switch(token.type) {
2065 if(declaration == NULL) {
2066 errorf(HERE, "no identifier expected in typename");
2068 declaration->symbol = token.v.symbol;
2069 declaration->source_position = token.source_position;
2075 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2081 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2082 /* avoid a loop in the outermost scope, because eat_statement doesn't
2084 if(token.type == '}' && current_function == NULL) {
2092 construct_type_t *p = last;
2095 construct_type_t *type;
2096 switch(token.type) {
2098 type = parse_function_declarator(declaration);
2101 type = parse_array_declarator();
2104 goto declarator_finished;
2107 /* insert in the middle of the list (behind p) */
2109 type->next = p->next;
2120 declarator_finished:
2123 /* append inner_types at the end of the list, we don't to set last anymore
2124 * as it's not needed anymore */
2126 assert(first == NULL);
2127 first = inner_types;
2129 last->next = inner_types;
2135 static type_t *construct_declarator_type(construct_type_t *construct_list,
2138 construct_type_t *iter = construct_list;
2139 for( ; iter != NULL; iter = iter->next) {
2140 switch(iter->type) {
2141 case CONSTRUCT_INVALID:
2142 panic("invalid type construction found");
2143 case CONSTRUCT_FUNCTION: {
2144 construct_function_type_t *construct_function_type
2145 = (construct_function_type_t*) iter;
2147 type_t *function_type = construct_function_type->function_type;
2149 function_type->function.return_type = type;
2151 type_t *skipped_return_type = skip_typeref(type);
2152 if (is_type_function(skipped_return_type)) {
2153 errorf(HERE, "function returning function is not allowed");
2154 type = type_error_type;
2155 } else if (is_type_array(skipped_return_type)) {
2156 errorf(HERE, "function returning array is not allowed");
2157 type = type_error_type;
2159 type = function_type;
2164 case CONSTRUCT_POINTER: {
2165 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2166 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2167 pointer_type->pointer.points_to = type;
2168 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2170 type = pointer_type;
2174 case CONSTRUCT_ARRAY: {
2175 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2176 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2178 array_type->base.qualifiers = parsed_array->type_qualifiers;
2179 array_type->array.element_type = type;
2180 array_type->array.is_static = parsed_array->is_static;
2181 array_type->array.is_variable = parsed_array->is_variable;
2182 array_type->array.size = parsed_array->size;
2184 type_t *skipped_type = skip_typeref(type);
2185 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
2186 errorf(HERE, "array of void is not allowed");
2187 type = type_error_type;
2195 type_t *hashed_type = typehash_insert(type);
2196 if(hashed_type != type) {
2197 /* the function type was constructed earlier freeing it here will
2198 * destroy other types... */
2199 if(iter->type != CONSTRUCT_FUNCTION) {
2209 static declaration_t *parse_declarator(
2210 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2212 declaration_t *const declaration = allocate_declaration_zero();
2213 declaration->storage_class = specifiers->storage_class;
2214 declaration->modifiers = specifiers->decl_modifiers;
2215 declaration->is_inline = specifiers->is_inline;
2217 construct_type_t *construct_type
2218 = parse_inner_declarator(declaration, may_be_abstract);
2219 type_t *const type = specifiers->type;
2220 declaration->type = construct_declarator_type(construct_type, type);
2222 if(construct_type != NULL) {
2223 obstack_free(&temp_obst, construct_type);
2229 static type_t *parse_abstract_declarator(type_t *base_type)
2231 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2233 type_t *result = construct_declarator_type(construct_type, base_type);
2234 if(construct_type != NULL) {
2235 obstack_free(&temp_obst, construct_type);
2241 static declaration_t *append_declaration(declaration_t* const declaration)
2243 if (last_declaration != NULL) {
2244 last_declaration->next = declaration;
2246 context->declarations = declaration;
2248 last_declaration = declaration;
2252 static bool is_sym_main(const symbol_t *const sym)
2254 return strcmp(sym->string, "main") == 0;
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 !is_sym_main(symbol)) {
2304 warningf(declaration->source_position, "no previous prototype for '%#T'", type, symbol);
2306 } else if (new_storage_class == STORAGE_CLASS_NONE) {
2307 new_storage_class = STORAGE_CLASS_EXTERN;
2315 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2316 new_storage_class == STORAGE_CLASS_EXTERN) {
2317 warn_redundant_declaration:
2318 if (warning.redundant_decls) {
2319 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2320 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2322 } else if (current_function == NULL) {
2323 if (old_storage_class != STORAGE_CLASS_STATIC &&
2324 new_storage_class == STORAGE_CLASS_STATIC) {
2325 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2326 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2328 if (old_storage_class != STORAGE_CLASS_EXTERN && !is_function_definition) {
2329 goto warn_redundant_declaration;
2331 if (new_storage_class == STORAGE_CLASS_NONE) {
2332 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2336 if (old_storage_class == new_storage_class) {
2337 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2339 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2341 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2344 return previous_declaration;
2346 } else if (is_function_definition &&
2347 declaration->storage_class != STORAGE_CLASS_STATIC) {
2348 if (warning.missing_prototypes && !is_sym_main(symbol)) {
2349 warningf(declaration->source_position, "no previous prototype for '%#T'", type, symbol);
2350 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
2351 warningf(declaration->source_position, "no previous declaration for '%#T'", type, symbol);
2353 } else if (warning.missing_declarations &&
2354 context == global_context &&
2355 declaration->storage_class != STORAGE_CLASS_STATIC &&
2356 declaration->storage_class != STORAGE_CLASS_TYPEDEF &&
2357 declaration->storage_class != STORAGE_CLASS_ENUM_ENTRY &&
2358 declaration->storage_class != STORAGE_CLASS_THREAD_STATIC) {
2359 warningf(declaration->source_position, "no previous declaration for '%#T'", type, symbol);
2362 assert(declaration->parent_context == NULL);
2363 assert(declaration->symbol != NULL);
2364 assert(context != NULL);
2366 declaration->parent_context = context;
2368 environment_push(declaration);
2369 return append_declaration(declaration);
2372 static declaration_t *record_declaration(declaration_t *declaration)
2374 return internal_record_declaration(declaration, false);
2377 static declaration_t *record_function_definition(declaration_t *declaration)
2379 return internal_record_declaration(declaration, true);
2382 static void parser_error_multiple_definition(declaration_t *declaration,
2383 const source_position_t source_position)
2385 errorf(source_position, "multiple definition of symbol '%Y'",
2386 declaration->symbol);
2387 errorf(declaration->source_position,
2388 "this is the location of the previous definition.");
2391 static bool is_declaration_specifier(const token_t *token,
2392 bool only_type_specifiers)
2394 switch(token->type) {
2398 return is_typedef_symbol(token->v.symbol);
2400 case T___extension__:
2403 return !only_type_specifiers;
2410 static void parse_init_declarator_rest(declaration_t *declaration)
2414 type_t *orig_type = declaration->type;
2415 type_t *type = type = skip_typeref(orig_type);
2417 if(declaration->init.initializer != NULL) {
2418 parser_error_multiple_definition(declaration, token.source_position);
2421 initializer_t *initializer = parse_initializer(type);
2423 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2424 * the array type size */
2425 if(is_type_array(type) && initializer != NULL) {
2426 array_type_t *array_type = &type->array;
2428 if(array_type->size == NULL) {
2429 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2431 cnst->base.datatype = type_size_t;
2433 switch (initializer->kind) {
2434 case INITIALIZER_LIST: {
2435 cnst->conste.v.int_value = initializer->list.len;
2439 case INITIALIZER_STRING: {
2440 cnst->conste.v.int_value = initializer->string.string.size;
2444 case INITIALIZER_WIDE_STRING: {
2445 cnst->conste.v.int_value = initializer->wide_string.string.size;
2450 panic("invalid initializer type");
2453 array_type->size = cnst;
2457 if(is_type_function(type)) {
2458 errorf(declaration->source_position,
2459 "initializers not allowed for function types at declator '%Y' (type '%T')",
2460 declaration->symbol, orig_type);
2462 declaration->init.initializer = initializer;
2466 /* parse rest of a declaration without any declarator */
2467 static void parse_anonymous_declaration_rest(
2468 const declaration_specifiers_t *specifiers,
2469 parsed_declaration_func finished_declaration)
2473 declaration_t *const declaration = allocate_declaration_zero();
2474 declaration->type = specifiers->type;
2475 declaration->storage_class = specifiers->storage_class;
2476 declaration->source_position = specifiers->source_position;
2478 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2479 warningf(declaration->source_position, "useless storage class in empty declaration");
2482 type_t *type = declaration->type;
2483 switch (type->kind) {
2484 case TYPE_COMPOUND_STRUCT:
2485 case TYPE_COMPOUND_UNION: {
2486 if (type->compound.declaration->symbol == NULL) {
2487 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2496 warningf(declaration->source_position, "empty declaration");
2500 finished_declaration(declaration);
2503 static void parse_declaration_rest(declaration_t *ndeclaration,
2504 const declaration_specifiers_t *specifiers,
2505 parsed_declaration_func finished_declaration)
2508 declaration_t *declaration = finished_declaration(ndeclaration);
2510 type_t *orig_type = declaration->type;
2511 type_t *type = skip_typeref(orig_type);
2513 if (type->kind != TYPE_FUNCTION &&
2514 declaration->is_inline &&
2515 is_type_valid(type)) {
2516 warningf(declaration->source_position,
2517 "variable '%Y' declared 'inline'\n", declaration->symbol);
2520 if(token.type == '=') {
2521 parse_init_declarator_rest(declaration);
2524 if(token.type != ',')
2528 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2533 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2535 symbol_t *symbol = declaration->symbol;
2536 if(symbol == NULL) {
2537 errorf(HERE, "anonymous declaration not valid as function parameter");
2540 namespace_t namespc = (namespace_t) declaration->namespc;
2541 if(namespc != NAMESPACE_NORMAL) {
2542 return record_declaration(declaration);
2545 declaration_t *previous_declaration = get_declaration(symbol, namespc);
2546 if(previous_declaration == NULL ||
2547 previous_declaration->parent_context != context) {
2548 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
2553 if(previous_declaration->type == NULL) {
2554 previous_declaration->type = declaration->type;
2555 previous_declaration->storage_class = declaration->storage_class;
2556 previous_declaration->parent_context = context;
2557 return previous_declaration;
2559 return record_declaration(declaration);
2563 static void parse_declaration(parsed_declaration_func finished_declaration)
2565 declaration_specifiers_t specifiers;
2566 memset(&specifiers, 0, sizeof(specifiers));
2567 parse_declaration_specifiers(&specifiers);
2569 if(token.type == ';') {
2570 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2572 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2573 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2577 static void parse_kr_declaration_list(declaration_t *declaration)
2579 type_t *type = skip_typeref(declaration->type);
2580 if(!is_type_function(type))
2583 if(!type->function.kr_style_parameters)
2586 /* push function parameters */
2587 int top = environment_top();
2588 context_t *last_context = context;
2589 set_context(&declaration->context);
2591 declaration_t *parameter = declaration->context.declarations;
2592 for( ; parameter != NULL; parameter = parameter->next) {
2593 assert(parameter->parent_context == NULL);
2594 parameter->parent_context = context;
2595 environment_push(parameter);
2598 /* parse declaration list */
2599 while(is_declaration_specifier(&token, false)) {
2600 parse_declaration(finished_kr_declaration);
2603 /* pop function parameters */
2604 assert(context == &declaration->context);
2605 set_context(last_context);
2606 environment_pop_to(top);
2608 /* update function type */
2609 type_t *new_type = duplicate_type(type);
2610 new_type->function.kr_style_parameters = false;
2612 function_parameter_t *parameters = NULL;
2613 function_parameter_t *last_parameter = NULL;
2615 declaration_t *parameter_declaration = declaration->context.declarations;
2616 for( ; parameter_declaration != NULL;
2617 parameter_declaration = parameter_declaration->next) {
2618 type_t *parameter_type = parameter_declaration->type;
2619 if(parameter_type == NULL) {
2621 errorf(HERE, "no type specified for function parameter '%Y'",
2622 parameter_declaration->symbol);
2624 if (warning.implicit_int) {
2625 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
2626 parameter_declaration->symbol);
2628 parameter_type = type_int;
2629 parameter_declaration->type = parameter_type;
2633 semantic_parameter(parameter_declaration);
2634 parameter_type = parameter_declaration->type;
2636 function_parameter_t *function_parameter
2637 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2638 memset(function_parameter, 0, sizeof(function_parameter[0]));
2640 function_parameter->type = parameter_type;
2641 if(last_parameter != NULL) {
2642 last_parameter->next = function_parameter;
2644 parameters = function_parameter;
2646 last_parameter = function_parameter;
2648 new_type->function.parameters = parameters;
2650 type = typehash_insert(new_type);
2651 if(type != new_type) {
2652 obstack_free(type_obst, new_type);
2655 declaration->type = type;
2659 * Check if all labels are defined in the current function.
2661 static void check_for_missing_labels(void)
2663 bool first_err = true;
2664 for (const goto_statement_t *goto_statement = goto_first;
2665 goto_statement != NULL;
2666 goto_statement = goto_statement->next) {
2667 const declaration_t *label = goto_statement->label;
2669 if (label->source_position.input_name == NULL) {
2672 diagnosticf("%s: In function '%Y':\n",
2673 current_function->source_position.input_name,
2674 current_function->symbol);
2676 errorf(goto_statement->statement.source_position,
2677 "label '%Y' used but not defined", label->symbol);
2680 goto_first = goto_last = NULL;
2683 static void parse_external_declaration(void)
2685 /* function-definitions and declarations both start with declaration
2687 declaration_specifiers_t specifiers;
2688 memset(&specifiers, 0, sizeof(specifiers));
2689 parse_declaration_specifiers(&specifiers);
2691 /* must be a declaration */
2692 if(token.type == ';') {
2693 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2697 /* declarator is common to both function-definitions and declarations */
2698 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2700 /* must be a declaration */
2701 if(token.type == ',' || token.type == '=' || token.type == ';') {
2702 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2706 /* must be a function definition */
2707 parse_kr_declaration_list(ndeclaration);
2709 if(token.type != '{') {
2710 parse_error_expected("while parsing function definition", '{', 0);
2715 type_t *type = ndeclaration->type;
2717 /* note that we don't skip typerefs: the standard doesn't allow them here
2718 * (so we can't use is_type_function here) */
2719 if(type->kind != TYPE_FUNCTION) {
2720 if (is_type_valid(type)) {
2721 errorf(HERE, "declarator '%#T' has a body but is not a function type",
2722 type, ndeclaration->symbol);
2728 /* § 6.7.5.3 (14) a function definition with () means no
2729 * parameters (and not unspecified parameters) */
2730 if(type->function.unspecified_parameters) {
2731 type_t *duplicate = duplicate_type(type);
2732 duplicate->function.unspecified_parameters = false;
2734 type = typehash_insert(duplicate);
2735 if(type != duplicate) {
2736 obstack_free(type_obst, duplicate);
2738 ndeclaration->type = type;
2741 declaration_t *const declaration = record_function_definition(ndeclaration);
2742 if(ndeclaration != declaration) {
2743 declaration->context = ndeclaration->context;
2745 type = skip_typeref(declaration->type);
2747 /* push function parameters and switch context */
2748 int top = environment_top();
2749 context_t *last_context = context;
2750 set_context(&declaration->context);
2752 declaration_t *parameter = declaration->context.declarations;
2753 for( ; parameter != NULL; parameter = parameter->next) {
2754 if(parameter->parent_context == &ndeclaration->context) {
2755 parameter->parent_context = context;
2757 assert(parameter->parent_context == NULL
2758 || parameter->parent_context == context);
2759 parameter->parent_context = context;
2760 environment_push(parameter);
2763 if(declaration->init.statement != NULL) {
2764 parser_error_multiple_definition(declaration, token.source_position);
2766 goto end_of_parse_external_declaration;
2768 /* parse function body */
2769 int label_stack_top = label_top();
2770 declaration_t *old_current_function = current_function;
2771 current_function = declaration;
2773 declaration->init.statement = parse_compound_statement();
2774 check_for_missing_labels();
2776 assert(current_function == declaration);
2777 current_function = old_current_function;
2778 label_pop_to(label_stack_top);
2781 end_of_parse_external_declaration:
2782 assert(context == &declaration->context);
2783 set_context(last_context);
2784 environment_pop_to(top);
2787 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2789 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2790 type->bitfield.base = base;
2791 type->bitfield.size = size;
2796 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2798 /* TODO: check constraints for struct declarations (in specifiers) */
2800 declaration_t *declaration;
2802 if(token.type == ':') {
2805 type_t *base_type = specifiers->type;
2806 expression_t *size = parse_constant_expression();
2808 type_t *type = make_bitfield_type(base_type, size);
2810 declaration = allocate_declaration_zero();
2811 declaration->namespc = NAMESPACE_NORMAL;
2812 declaration->storage_class = STORAGE_CLASS_NONE;
2813 declaration->source_position = token.source_position;
2814 declaration->modifiers = specifiers->decl_modifiers;
2815 declaration->type = type;
2817 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2819 if(token.type == ':') {
2821 expression_t *size = parse_constant_expression();
2823 type_t *type = make_bitfield_type(declaration->type, size);
2824 declaration->type = type;
2827 record_declaration(declaration);
2829 if(token.type != ',')
2836 static void parse_compound_type_entries(void)
2840 while(token.type != '}' && token.type != T_EOF) {
2841 declaration_specifiers_t specifiers;
2842 memset(&specifiers, 0, sizeof(specifiers));
2843 parse_declaration_specifiers(&specifiers);
2845 parse_struct_declarators(&specifiers);
2847 if(token.type == T_EOF) {
2848 errorf(HERE, "EOF while parsing struct");
2853 static type_t *parse_typename(void)
2855 declaration_specifiers_t specifiers;
2856 memset(&specifiers, 0, sizeof(specifiers));
2857 parse_declaration_specifiers(&specifiers);
2858 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2859 /* TODO: improve error message, user does probably not know what a
2860 * storage class is...
2862 errorf(HERE, "typename may not have a storage class");
2865 type_t *result = parse_abstract_declarator(specifiers.type);
2873 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2874 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2875 expression_t *left);
2877 typedef struct expression_parser_function_t expression_parser_function_t;
2878 struct expression_parser_function_t {
2879 unsigned precedence;
2880 parse_expression_function parser;
2881 unsigned infix_precedence;
2882 parse_expression_infix_function infix_parser;
2885 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2888 * Creates a new invalid expression.
2890 static expression_t *create_invalid_expression(void)
2892 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2893 expression->base.source_position = token.source_position;
2898 * Prints an error message if an expression was expected but not read
2900 static expression_t *expected_expression_error(void)
2902 /* skip the error message if the error token was read */
2903 if (token.type != T_ERROR) {
2904 errorf(HERE, "expected expression, got token '%K'", &token);
2908 return create_invalid_expression();
2912 * Parse a string constant.
2914 static expression_t *parse_string_const(void)
2916 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2917 cnst->base.datatype = type_string;
2918 cnst->string.value = parse_string_literals();
2924 * Parse a wide string constant.
2926 static expression_t *parse_wide_string_const(void)
2928 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2929 cnst->base.datatype = type_wchar_t_ptr;
2930 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2936 * Parse an integer constant.
2938 static expression_t *parse_int_const(void)
2940 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2941 cnst->base.datatype = token.datatype;
2942 cnst->conste.v.int_value = token.v.intvalue;
2950 * Parse a float constant.
2952 static expression_t *parse_float_const(void)
2954 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2955 cnst->base.datatype = token.datatype;
2956 cnst->conste.v.float_value = token.v.floatvalue;
2963 static declaration_t *create_implicit_function(symbol_t *symbol,
2964 const source_position_t source_position)
2966 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
2967 ntype->function.return_type = type_int;
2968 ntype->function.unspecified_parameters = true;
2970 type_t *type = typehash_insert(ntype);
2975 declaration_t *const declaration = allocate_declaration_zero();
2976 declaration->storage_class = STORAGE_CLASS_EXTERN;
2977 declaration->type = type;
2978 declaration->symbol = symbol;
2979 declaration->source_position = source_position;
2980 declaration->parent_context = global_context;
2982 context_t *old_context = context;
2983 set_context(global_context);
2985 environment_push(declaration);
2986 /* prepend the declaration to the global declarations list */
2987 declaration->next = context->declarations;
2988 context->declarations = declaration;
2990 assert(context == global_context);
2991 set_context(old_context);
2997 * Creates a return_type (func)(argument_type) function type if not
3000 * @param return_type the return type
3001 * @param argument_type the argument type
3003 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
3005 function_parameter_t *parameter
3006 = obstack_alloc(type_obst, sizeof(parameter[0]));
3007 memset(parameter, 0, sizeof(parameter[0]));
3008 parameter->type = argument_type;
3010 type_t *type = allocate_type_zero(TYPE_FUNCTION);
3011 type->function.return_type = return_type;
3012 type->function.parameters = parameter;
3014 type_t *result = typehash_insert(type);
3015 if(result != type) {
3023 * Creates a function type for some function like builtins.
3025 * @param symbol the symbol describing the builtin
3027 static type_t *get_builtin_symbol_type(symbol_t *symbol)
3029 switch(symbol->ID) {
3030 case T___builtin_alloca:
3031 return make_function_1_type(type_void_ptr, type_size_t);
3032 case T___builtin_nan:
3033 return make_function_1_type(type_double, type_string);
3034 case T___builtin_nanf:
3035 return make_function_1_type(type_float, type_string);
3036 case T___builtin_nand:
3037 return make_function_1_type(type_long_double, type_string);
3038 case T___builtin_va_end:
3039 return make_function_1_type(type_void, type_valist);
3041 panic("not implemented builtin symbol found");
3046 * Performs automatic type cast as described in § 6.3.2.1.
3048 * @param orig_type the original type
3050 static type_t *automatic_type_conversion(type_t *orig_type)
3052 type_t *type = skip_typeref(orig_type);
3053 if(is_type_array(type)) {
3054 array_type_t *array_type = &type->array;
3055 type_t *element_type = array_type->element_type;
3056 unsigned qualifiers = array_type->type.qualifiers;
3058 return make_pointer_type(element_type, qualifiers);
3061 if(is_type_function(type)) {
3062 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3069 * reverts the automatic casts of array to pointer types and function
3070 * to function-pointer types as defined § 6.3.2.1
3072 type_t *revert_automatic_type_conversion(const expression_t *expression)
3074 switch (expression->kind) {
3075 case EXPR_REFERENCE: return expression->reference.declaration->type;
3076 case EXPR_SELECT: return expression->select.compound_entry->type;
3078 case EXPR_UNARY_DEREFERENCE: {
3079 const expression_t *const value = expression->unary.value;
3080 type_t *const type = skip_typeref(value->base.datatype);
3081 assert(is_type_pointer(type));
3082 return type->pointer.points_to;
3085 case EXPR_BUILTIN_SYMBOL:
3086 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
3088 case EXPR_ARRAY_ACCESS: {
3089 const expression_t *const array_ref = expression->array_access.array_ref;
3090 type_t *const type_left = skip_typeref(array_ref->base.datatype);
3091 if (!is_type_valid(type_left))
3093 assert(is_type_pointer(type_left));
3094 return type_left->pointer.points_to;
3100 return expression->base.datatype;
3103 static expression_t *parse_reference(void)
3105 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3107 reference_expression_t *ref = &expression->reference;
3108 ref->symbol = token.v.symbol;
3110 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3112 source_position_t source_position = token.source_position;
3115 if(declaration == NULL) {
3116 if (! strict_mode && token.type == '(') {
3117 /* an implicitly defined function */
3118 if (warning.implicit_function_declaration) {
3119 warningf(HERE, "implicit declaration of function '%Y'",
3123 declaration = create_implicit_function(ref->symbol,
3126 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3131 type_t *type = declaration->type;
3133 /* we always do the auto-type conversions; the & and sizeof parser contains
3134 * code to revert this! */
3135 type = automatic_type_conversion(type);
3137 ref->declaration = declaration;
3138 ref->expression.datatype = type;
3143 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3147 /* TODO check if explicit cast is allowed and issue warnings/errors */
3150 static expression_t *parse_cast(void)
3152 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3154 cast->base.source_position = token.source_position;
3156 type_t *type = parse_typename();
3159 expression_t *value = parse_sub_expression(20);
3161 check_cast_allowed(value, type);
3163 cast->base.datatype = type;
3164 cast->unary.value = value;
3169 static expression_t *parse_statement_expression(void)
3171 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3173 statement_t *statement = parse_compound_statement();
3174 expression->statement.statement = statement;
3175 expression->base.source_position = statement->base.source_position;
3177 /* find last statement and use its type */
3178 type_t *type = type_void;
3179 const statement_t *stmt = statement->compound.statements;
3181 while (stmt->base.next != NULL)
3182 stmt = stmt->base.next;
3184 if (stmt->kind == STATEMENT_EXPRESSION) {
3185 type = stmt->expression.expression->base.datatype;
3188 warningf(expression->base.source_position, "empty statement expression ({})");
3190 expression->base.datatype = type;
3197 static expression_t *parse_brace_expression(void)
3201 switch(token.type) {
3203 /* gcc extension: a statement expression */
3204 return parse_statement_expression();
3208 return parse_cast();
3210 if(is_typedef_symbol(token.v.symbol)) {
3211 return parse_cast();
3215 expression_t *result = parse_expression();
3221 static expression_t *parse_function_keyword(void)
3226 if (current_function == NULL) {
3227 errorf(HERE, "'__func__' used outside of a function");
3230 string_literal_expression_t *expression
3231 = allocate_ast_zero(sizeof(expression[0]));
3233 expression->expression.kind = EXPR_FUNCTION;
3234 expression->expression.datatype = type_string;
3236 return (expression_t*) expression;
3239 static expression_t *parse_pretty_function_keyword(void)
3241 eat(T___PRETTY_FUNCTION__);
3244 if (current_function == NULL) {
3245 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3248 string_literal_expression_t *expression
3249 = allocate_ast_zero(sizeof(expression[0]));
3251 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3252 expression->expression.datatype = type_string;
3254 return (expression_t*) expression;
3257 static designator_t *parse_designator(void)
3259 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3261 if(token.type != T_IDENTIFIER) {
3262 parse_error_expected("while parsing member designator",
3267 result->symbol = token.v.symbol;
3270 designator_t *last_designator = result;
3272 if(token.type == '.') {
3274 if(token.type != T_IDENTIFIER) {
3275 parse_error_expected("while parsing member designator",
3280 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3281 designator->symbol = token.v.symbol;
3284 last_designator->next = designator;
3285 last_designator = designator;
3288 if(token.type == '[') {
3290 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3291 designator->array_access = parse_expression();
3292 if(designator->array_access == NULL) {
3298 last_designator->next = designator;
3299 last_designator = designator;
3308 static expression_t *parse_offsetof(void)
3310 eat(T___builtin_offsetof);
3312 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3313 expression->base.datatype = type_size_t;
3316 expression->offsetofe.type = parse_typename();
3318 expression->offsetofe.designator = parse_designator();
3324 static expression_t *parse_va_start(void)
3326 eat(T___builtin_va_start);
3328 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3331 expression->va_starte.ap = parse_assignment_expression();
3333 expression_t *const expr = parse_assignment_expression();
3334 if (expr->kind == EXPR_REFERENCE) {
3335 declaration_t *const decl = expr->reference.declaration;
3336 if (decl->parent_context == ¤t_function->context &&
3337 decl->next == NULL) {
3338 expression->va_starte.parameter = decl;
3343 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3345 return create_invalid_expression();
3348 static expression_t *parse_va_arg(void)
3350 eat(T___builtin_va_arg);
3352 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3355 expression->va_arge.ap = parse_assignment_expression();
3357 expression->base.datatype = parse_typename();
3363 static expression_t *parse_builtin_symbol(void)
3365 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3367 symbol_t *symbol = token.v.symbol;
3369 expression->builtin_symbol.symbol = symbol;
3372 type_t *type = get_builtin_symbol_type(symbol);
3373 type = automatic_type_conversion(type);
3375 expression->base.datatype = type;
3379 static expression_t *parse_builtin_constant(void)
3381 eat(T___builtin_constant_p);
3383 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3386 expression->builtin_constant.value = parse_assignment_expression();
3388 expression->base.datatype = type_int;
3393 static expression_t *parse_builtin_prefetch(void)
3395 eat(T___builtin_prefetch);
3397 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3400 expression->builtin_prefetch.adr = parse_assignment_expression();
3401 if (token.type == ',') {
3403 expression->builtin_prefetch.rw = parse_assignment_expression();
3405 if (token.type == ',') {
3407 expression->builtin_prefetch.locality = parse_assignment_expression();
3410 expression->base.datatype = type_void;
3415 static expression_t *parse_compare_builtin(void)
3417 expression_t *expression;
3419 switch(token.type) {
3420 case T___builtin_isgreater:
3421 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3423 case T___builtin_isgreaterequal:
3424 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3426 case T___builtin_isless:
3427 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3429 case T___builtin_islessequal:
3430 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3432 case T___builtin_islessgreater:
3433 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3435 case T___builtin_isunordered:
3436 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3439 panic("invalid compare builtin found");
3445 expression->binary.left = parse_assignment_expression();
3447 expression->binary.right = parse_assignment_expression();
3450 type_t *const orig_type_left = expression->binary.left->base.datatype;
3451 type_t *const orig_type_right = expression->binary.right->base.datatype;
3453 type_t *const type_left = skip_typeref(orig_type_left);
3454 type_t *const type_right = skip_typeref(orig_type_right);
3455 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3456 if (is_type_valid(type_left) && is_type_valid(type_right)) {
3457 type_error_incompatible("invalid operands in comparison",
3458 token.source_position, orig_type_left, orig_type_right);
3461 semantic_comparison(&expression->binary);
3467 static expression_t *parse_builtin_expect(void)
3469 eat(T___builtin_expect);
3471 expression_t *expression
3472 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3475 expression->binary.left = parse_assignment_expression();
3477 expression->binary.right = parse_constant_expression();
3480 expression->base.datatype = expression->binary.left->base.datatype;
3485 static expression_t *parse_assume(void) {
3488 expression_t *expression
3489 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3492 expression->unary.value = parse_assignment_expression();
3495 expression->base.datatype = type_void;
3499 static expression_t *parse_alignof(void) {
3502 expression_t *expression
3503 = allocate_expression_zero(EXPR_ALIGNOF);
3506 expression->alignofe.type = parse_typename();
3509 expression->base.datatype = type_size_t;
3513 static expression_t *parse_primary_expression(void)
3515 switch(token.type) {
3517 return parse_int_const();
3518 case T_FLOATINGPOINT:
3519 return parse_float_const();
3520 case T_STRING_LITERAL:
3521 return parse_string_const();
3522 case T_WIDE_STRING_LITERAL:
3523 return parse_wide_string_const();
3525 return parse_reference();
3526 case T___FUNCTION__:
3528 return parse_function_keyword();
3529 case T___PRETTY_FUNCTION__:
3530 return parse_pretty_function_keyword();
3531 case T___builtin_offsetof:
3532 return parse_offsetof();
3533 case T___builtin_va_start:
3534 return parse_va_start();
3535 case T___builtin_va_arg:
3536 return parse_va_arg();
3537 case T___builtin_expect:
3538 return parse_builtin_expect();
3539 case T___builtin_nanf:
3540 case T___builtin_alloca:
3541 case T___builtin_va_end:
3542 return parse_builtin_symbol();
3543 case T___builtin_isgreater:
3544 case T___builtin_isgreaterequal:
3545 case T___builtin_isless:
3546 case T___builtin_islessequal:
3547 case T___builtin_islessgreater:
3548 case T___builtin_isunordered:
3549 return parse_compare_builtin();
3550 case T___builtin_constant_p:
3551 return parse_builtin_constant();
3552 case T___builtin_prefetch:
3553 return parse_builtin_prefetch();
3555 return parse_alignof();
3557 return parse_assume();
3560 return parse_brace_expression();
3563 errorf(HERE, "unexpected token '%K'", &token);
3566 return create_invalid_expression();
3570 * Check if the expression has the character type and issue a warning then.
3572 static void check_for_char_index_type(const expression_t *expression) {
3573 type_t *const type = expression->base.datatype;
3574 const type_t *const base_type = skip_typeref(type);
3576 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
3577 warning.char_subscripts) {
3578 warningf(expression->base.source_position,
3579 "array subscript has type '%T'", type);
3583 static expression_t *parse_array_expression(unsigned precedence,
3590 expression_t *inside = parse_expression();
3592 array_access_expression_t *array_access
3593 = allocate_ast_zero(sizeof(array_access[0]));
3595 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3597 type_t *const orig_type_left = left->base.datatype;
3598 type_t *const orig_type_inside = inside->base.datatype;
3600 type_t *const type_left = skip_typeref(orig_type_left);
3601 type_t *const type_inside = skip_typeref(orig_type_inside);
3603 type_t *return_type;
3604 if (is_type_pointer(type_left)) {
3605 return_type = type_left->pointer.points_to;
3606 array_access->array_ref = left;
3607 array_access->index = inside;
3608 check_for_char_index_type(inside);
3609 } else if (is_type_pointer(type_inside)) {
3610 return_type = type_inside->pointer.points_to;
3611 array_access->array_ref = inside;
3612 array_access->index = left;
3613 array_access->flipped = true;
3614 check_for_char_index_type(left);
3616 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
3618 "array access on object with non-pointer types '%T', '%T'",
3619 orig_type_left, orig_type_inside);
3621 return_type = type_error_type;
3622 array_access->array_ref = create_invalid_expression();
3625 if(token.type != ']') {
3626 parse_error_expected("Problem while parsing array access", ']', 0);
3627 return (expression_t*) array_access;
3631 return_type = automatic_type_conversion(return_type);
3632 array_access->expression.datatype = return_type;
3634 return (expression_t*) array_access;
3637 static expression_t *parse_sizeof(unsigned precedence)
3641 sizeof_expression_t *sizeof_expression
3642 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3643 sizeof_expression->expression.kind = EXPR_SIZEOF;
3644 sizeof_expression->expression.datatype = type_size_t;
3646 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3648 sizeof_expression->type = parse_typename();
3651 expression_t *expression = parse_sub_expression(precedence);
3652 expression->base.datatype = revert_automatic_type_conversion(expression);
3654 sizeof_expression->type = expression->base.datatype;
3655 sizeof_expression->size_expression = expression;
3658 return (expression_t*) sizeof_expression;
3661 static expression_t *parse_select_expression(unsigned precedence,
3662 expression_t *compound)
3665 assert(token.type == '.' || token.type == T_MINUSGREATER);
3667 bool is_pointer = (token.type == T_MINUSGREATER);
3670 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3671 select->select.compound = compound;
3673 if(token.type != T_IDENTIFIER) {
3674 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3677 symbol_t *symbol = token.v.symbol;
3678 select->select.symbol = symbol;
3681 type_t *const orig_type = compound->base.datatype;
3682 type_t *const type = skip_typeref(orig_type);
3684 type_t *type_left = type;
3686 if (!is_type_pointer(type)) {
3687 if (is_type_valid(type)) {
3688 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3690 return create_invalid_expression();
3692 type_left = type->pointer.points_to;
3694 type_left = skip_typeref(type_left);
3696 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
3697 type_left->kind != TYPE_COMPOUND_UNION) {
3698 if (is_type_valid(type_left)) {
3699 errorf(HERE, "request for member '%Y' in something not a struct or "
3700 "union, but '%T'", symbol, type_left);
3702 return create_invalid_expression();
3705 declaration_t *const declaration = type_left->compound.declaration;
3707 if(!declaration->init.is_defined) {
3708 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3710 return create_invalid_expression();
3713 declaration_t *iter = declaration->context.declarations;
3714 for( ; iter != NULL; iter = iter->next) {
3715 if(iter->symbol == symbol) {
3720 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3721 return create_invalid_expression();
3724 /* we always do the auto-type conversions; the & and sizeof parser contains
3725 * code to revert this! */
3726 type_t *expression_type = automatic_type_conversion(iter->type);
3728 select->select.compound_entry = iter;
3729 select->base.datatype = expression_type;
3731 if(expression_type->kind == TYPE_BITFIELD) {
3732 expression_t *extract
3733 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3734 extract->unary.value = select;
3735 extract->base.datatype = expression_type->bitfield.base;
3744 * Parse a call expression, ie. expression '( ... )'.
3746 * @param expression the function address
3748 static expression_t *parse_call_expression(unsigned precedence,
3749 expression_t *expression)
3752 expression_t *result = allocate_expression_zero(EXPR_CALL);
3754 call_expression_t *call = &result->call;
3755 call->function = expression;
3757 type_t *const orig_type = expression->base.datatype;
3758 type_t *const type = skip_typeref(orig_type);
3760 function_type_t *function_type = NULL;
3761 if (is_type_pointer(type)) {
3762 type_t *const to_type = skip_typeref(type->pointer.points_to);
3764 if (is_type_function(to_type)) {
3765 function_type = &to_type->function;
3766 call->expression.datatype = function_type->return_type;
3770 if (function_type == NULL && is_type_valid(type)) {
3771 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3774 /* parse arguments */
3777 if(token.type != ')') {
3778 call_argument_t *last_argument = NULL;
3781 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3783 argument->expression = parse_assignment_expression();
3784 if(last_argument == NULL) {
3785 call->arguments = argument;
3787 last_argument->next = argument;
3789 last_argument = argument;
3791 if(token.type != ',')
3798 if(function_type != NULL) {
3799 function_parameter_t *parameter = function_type->parameters;
3800 call_argument_t *argument = call->arguments;
3801 for( ; parameter != NULL && argument != NULL;
3802 parameter = parameter->next, argument = argument->next) {
3803 type_t *expected_type = parameter->type;
3804 /* TODO report context in error messages */
3805 expression_t *const arg_expr = argument->expression;
3806 type_t *const res_type = semantic_assign(expected_type, arg_expr, "function call");
3807 if (res_type == NULL) {
3808 /* TODO improve error message */
3809 errorf(arg_expr->base.source_position,
3810 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
3811 arg_expr, arg_expr->base.datatype, expected_type);
3813 argument->expression = create_implicit_cast(argument->expression, expected_type);
3816 /* too few parameters */
3817 if(parameter != NULL) {
3818 errorf(HERE, "too few arguments to function '%E'", expression);
3819 } else if(argument != NULL) {
3820 /* too many parameters */
3821 if(!function_type->variadic
3822 && !function_type->unspecified_parameters) {
3823 errorf(HERE, "too many arguments to function '%E'", expression);
3825 /* do default promotion */
3826 for( ; argument != NULL; argument = argument->next) {
3827 type_t *type = argument->expression->base.datatype;
3829 type = skip_typeref(type);
3830 if(is_type_integer(type)) {
3831 type = promote_integer(type);
3832 } else if(type == type_float) {
3836 argument->expression
3837 = create_implicit_cast(argument->expression, type);
3840 check_format(&result->call);
3843 check_format(&result->call);
3850 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3852 static bool same_compound_type(const type_t *type1, const type_t *type2)
3855 is_type_compound(type1) &&
3856 type1->kind == type2->kind &&
3857 type1->compound.declaration == type2->compound.declaration;
3861 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3863 * @param expression the conditional expression
3865 static expression_t *parse_conditional_expression(unsigned precedence,
3866 expression_t *expression)
3870 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3872 conditional_expression_t *conditional = &result->conditional;
3873 conditional->condition = expression;
3876 type_t *const condition_type_orig = expression->base.datatype;
3877 type_t *const condition_type = skip_typeref(condition_type_orig);
3878 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
3879 type_error("expected a scalar type in conditional condition",
3880 expression->base.source_position, condition_type_orig);
3883 expression_t *true_expression = parse_expression();
3885 expression_t *false_expression = parse_sub_expression(precedence);
3887 conditional->true_expression = true_expression;
3888 conditional->false_expression = false_expression;
3890 type_t *const orig_true_type = true_expression->base.datatype;
3891 type_t *const orig_false_type = false_expression->base.datatype;
3892 type_t *const true_type = skip_typeref(orig_true_type);
3893 type_t *const false_type = skip_typeref(orig_false_type);
3896 type_t *result_type;
3897 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3898 result_type = semantic_arithmetic(true_type, false_type);
3900 true_expression = create_implicit_cast(true_expression, result_type);
3901 false_expression = create_implicit_cast(false_expression, result_type);
3903 conditional->true_expression = true_expression;
3904 conditional->false_expression = false_expression;
3905 conditional->expression.datatype = result_type;
3906 } else if (same_compound_type(true_type, false_type) || (
3907 is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3908 is_type_atomic(false_type, ATOMIC_TYPE_VOID)
3910 /* just take 1 of the 2 types */
3911 result_type = true_type;
3912 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3913 && pointers_compatible(true_type, false_type)) {
3915 result_type = true_type;
3918 if (is_type_valid(true_type) && is_type_valid(false_type)) {
3919 type_error_incompatible("while parsing conditional",
3920 expression->base.source_position, true_type,
3923 result_type = type_error_type;
3926 conditional->expression.datatype = result_type;
3931 * Parse an extension expression.
3933 static expression_t *parse_extension(unsigned precedence)
3935 eat(T___extension__);
3937 /* TODO enable extensions */
3938 expression_t *expression = parse_sub_expression(precedence);
3939 /* TODO disable extensions */
3943 static expression_t *parse_builtin_classify_type(const unsigned precedence)
3945 eat(T___builtin_classify_type);
3947 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
3948 result->base.datatype = type_int;
3951 expression_t *expression = parse_sub_expression(precedence);
3953 result->classify_type.type_expression = expression;
3958 static void semantic_incdec(unary_expression_t *expression)
3960 type_t *const orig_type = expression->value->base.datatype;
3961 type_t *const type = skip_typeref(orig_type);
3962 /* TODO !is_type_real && !is_type_pointer */
3963 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
3964 if (is_type_valid(type)) {
3965 /* TODO: improve error message */
3966 errorf(HERE, "operation needs an arithmetic or pointer type");
3971 expression->expression.datatype = orig_type;
3974 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
3976 type_t *const orig_type = expression->value->base.datatype;
3977 type_t *const type = skip_typeref(orig_type);
3978 if(!is_type_arithmetic(type)) {
3979 if (is_type_valid(type)) {
3980 /* TODO: improve error message */
3981 errorf(HERE, "operation needs an arithmetic type");
3986 expression->expression.datatype = orig_type;
3989 static void semantic_unexpr_scalar(unary_expression_t *expression)
3991 type_t *const orig_type = expression->value->base.datatype;
3992 type_t *const type = skip_typeref(orig_type);
3993 if (!is_type_scalar(type)) {
3994 if (is_type_valid(type)) {
3995 errorf(HERE, "operand of ! must be of scalar type");
4000 expression->expression.datatype = orig_type;
4003 static void semantic_unexpr_integer(unary_expression_t *expression)
4005 type_t *const orig_type = expression->value->base.datatype;
4006 type_t *const type = skip_typeref(orig_type);
4007 if (!is_type_integer(type)) {
4008 if (is_type_valid(type)) {
4009 errorf(HERE, "operand of ~ must be of integer type");
4014 expression->expression.datatype = orig_type;
4017 static void semantic_dereference(unary_expression_t *expression)
4019 type_t *const orig_type = expression->value->base.datatype;
4020 type_t *const type = skip_typeref(orig_type);
4021 if(!is_type_pointer(type)) {
4022 if (is_type_valid(type)) {
4023 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4028 type_t *result_type = type->pointer.points_to;
4029 result_type = automatic_type_conversion(result_type);
4030 expression->expression.datatype = result_type;
4034 * Check the semantic of the address taken expression.
4036 static void semantic_take_addr(unary_expression_t *expression)
4038 expression_t *value = expression->value;
4039 value->base.datatype = revert_automatic_type_conversion(value);
4041 type_t *orig_type = value->base.datatype;
4042 if(!is_type_valid(orig_type))
4045 if(value->kind == EXPR_REFERENCE) {
4046 declaration_t *const declaration = value->reference.declaration;
4047 if(declaration != NULL) {
4048 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4049 errorf(expression->expression.source_position,
4050 "address of register variable '%Y' requested",
4051 declaration->symbol);
4053 declaration->address_taken = 1;
4057 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4060 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4061 static expression_t *parse_##unexpression_type(unsigned precedence) \
4065 expression_t *unary_expression \
4066 = allocate_expression_zero(unexpression_type); \
4067 unary_expression->base.source_position = HERE; \
4068 unary_expression->unary.value = parse_sub_expression(precedence); \
4070 sfunc(&unary_expression->unary); \
4072 return unary_expression; \
4075 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4076 semantic_unexpr_arithmetic)
4077 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4078 semantic_unexpr_arithmetic)
4079 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4080 semantic_unexpr_scalar)
4081 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4082 semantic_dereference)
4083 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4085 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4086 semantic_unexpr_integer)
4087 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4089 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4092 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4094 static expression_t *parse_##unexpression_type(unsigned precedence, \
4095 expression_t *left) \
4097 (void) precedence; \
4100 expression_t *unary_expression \
4101 = allocate_expression_zero(unexpression_type); \
4102 unary_expression->unary.value = left; \
4104 sfunc(&unary_expression->unary); \
4106 return unary_expression; \
4109 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4110 EXPR_UNARY_POSTFIX_INCREMENT,
4112 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4113 EXPR_UNARY_POSTFIX_DECREMENT,
4116 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4118 /* TODO: handle complex + imaginary types */
4120 /* § 6.3.1.8 Usual arithmetic conversions */
4121 if(type_left == type_long_double || type_right == type_long_double) {
4122 return type_long_double;
4123 } else if(type_left == type_double || type_right == type_double) {
4125 } else if(type_left == type_float || type_right == type_float) {
4129 type_right = promote_integer(type_right);
4130 type_left = promote_integer(type_left);
4132 if(type_left == type_right)
4135 bool signed_left = is_type_signed(type_left);
4136 bool signed_right = is_type_signed(type_right);
4137 int rank_left = get_rank(type_left);
4138 int rank_right = get_rank(type_right);
4139 if(rank_left < rank_right) {
4140 if(signed_left == signed_right || !signed_right) {
4146 if(signed_left == signed_right || !signed_left) {
4155 * Check the semantic restrictions for a binary expression.
4157 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4159 expression_t *const left = expression->left;
4160 expression_t *const right = expression->right;
4161 type_t *const orig_type_left = left->base.datatype;
4162 type_t *const orig_type_right = right->base.datatype;
4163 type_t *const type_left = skip_typeref(orig_type_left);
4164 type_t *const type_right = skip_typeref(orig_type_right);
4166 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4167 /* TODO: improve error message */
4168 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4169 errorf(HERE, "operation needs arithmetic types");
4174 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4175 expression->left = create_implicit_cast(left, arithmetic_type);
4176 expression->right = create_implicit_cast(right, arithmetic_type);
4177 expression->expression.datatype = arithmetic_type;
4180 static void semantic_shift_op(binary_expression_t *expression)
4182 expression_t *const left = expression->left;
4183 expression_t *const right = expression->right;
4184 type_t *const orig_type_left = left->base.datatype;
4185 type_t *const orig_type_right = right->base.datatype;
4186 type_t * type_left = skip_typeref(orig_type_left);
4187 type_t * type_right = skip_typeref(orig_type_right);
4189 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4190 /* TODO: improve error message */
4191 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4192 errorf(HERE, "operation needs integer types");
4197 type_left = promote_integer(type_left);
4198 type_right = promote_integer(type_right);
4200 expression->left = create_implicit_cast(left, type_left);
4201 expression->right = create_implicit_cast(right, type_right);
4202 expression->expression.datatype = type_left;
4205 static void semantic_add(binary_expression_t *expression)
4207 expression_t *const left = expression->left;
4208 expression_t *const right = expression->right;
4209 type_t *const orig_type_left = left->base.datatype;
4210 type_t *const orig_type_right = right->base.datatype;
4211 type_t *const type_left = skip_typeref(orig_type_left);
4212 type_t *const type_right = skip_typeref(orig_type_right);
4215 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4216 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4217 expression->left = create_implicit_cast(left, arithmetic_type);
4218 expression->right = create_implicit_cast(right, arithmetic_type);
4219 expression->expression.datatype = arithmetic_type;
4221 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4222 expression->expression.datatype = type_left;
4223 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4224 expression->expression.datatype = type_right;
4225 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4226 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4230 static void semantic_sub(binary_expression_t *expression)
4232 expression_t *const left = expression->left;
4233 expression_t *const right = expression->right;
4234 type_t *const orig_type_left = left->base.datatype;
4235 type_t *const orig_type_right = right->base.datatype;
4236 type_t *const type_left = skip_typeref(orig_type_left);
4237 type_t *const type_right = skip_typeref(orig_type_right);
4240 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4241 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4242 expression->left = create_implicit_cast(left, arithmetic_type);
4243 expression->right = create_implicit_cast(right, arithmetic_type);
4244 expression->expression.datatype = arithmetic_type;
4246 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4247 expression->expression.datatype = type_left;
4248 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4249 if(!pointers_compatible(type_left, type_right)) {
4250 errorf(HERE, "pointers to incompatible objects to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4252 expression->expression.datatype = type_ptrdiff_t;
4254 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4255 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')", orig_type_left, orig_type_right);
4259 static void semantic_comparison(binary_expression_t *expression)
4261 expression_t *left = expression->left;
4262 expression_t *right = expression->right;
4263 type_t *orig_type_left = left->base.datatype;
4264 type_t *orig_type_right = right->base.datatype;
4266 type_t *type_left = skip_typeref(orig_type_left);
4267 type_t *type_right = skip_typeref(orig_type_right);
4269 /* TODO non-arithmetic types */
4270 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4271 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4272 expression->left = create_implicit_cast(left, arithmetic_type);
4273 expression->right = create_implicit_cast(right, arithmetic_type);
4274 expression->expression.datatype = arithmetic_type;
4275 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4276 /* TODO check compatibility */
4277 } else if (is_type_pointer(type_left)) {
4278 expression->right = create_implicit_cast(right, type_left);
4279 } else if (is_type_pointer(type_right)) {
4280 expression->left = create_implicit_cast(left, type_right);
4281 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4282 type_error_incompatible("invalid operands in comparison",
4283 token.source_position, type_left, type_right);
4285 expression->expression.datatype = type_int;
4288 static void semantic_arithmetic_assign(binary_expression_t *expression)
4290 expression_t *left = expression->left;
4291 expression_t *right = expression->right;
4292 type_t *orig_type_left = left->base.datatype;
4293 type_t *orig_type_right = right->base.datatype;
4295 type_t *type_left = skip_typeref(orig_type_left);
4296 type_t *type_right = skip_typeref(orig_type_right);
4298 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4299 /* TODO: improve error message */
4300 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4301 errorf(HERE, "operation needs arithmetic types");
4306 /* combined instructions are tricky. We can't create an implicit cast on
4307 * the left side, because we need the uncasted form for the store.
4308 * The ast2firm pass has to know that left_type must be right_type
4309 * for the arithmetic operation and create a cast by itself */
4310 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4311 expression->right = create_implicit_cast(right, arithmetic_type);
4312 expression->expression.datatype = type_left;
4315 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4317 expression_t *const left = expression->left;
4318 expression_t *const right = expression->right;
4319 type_t *const orig_type_left = left->base.datatype;
4320 type_t *const orig_type_right = right->base.datatype;
4321 type_t *const type_left = skip_typeref(orig_type_left);
4322 type_t *const type_right = skip_typeref(orig_type_right);
4324 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4325 /* combined instructions are tricky. We can't create an implicit cast on
4326 * the left side, because we need the uncasted form for the store.
4327 * The ast2firm pass has to know that left_type must be right_type
4328 * for the arithmetic operation and create a cast by itself */
4329 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4330 expression->right = create_implicit_cast(right, arithmetic_type);
4331 expression->expression.datatype = type_left;
4332 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4333 expression->expression.datatype = type_left;
4334 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
4335 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4340 * Check the semantic restrictions of a logical expression.
4342 static void semantic_logical_op(binary_expression_t *expression)
4344 expression_t *const left = expression->left;
4345 expression_t *const right = expression->right;
4346 type_t *const orig_type_left = left->base.datatype;
4347 type_t *const orig_type_right = right->base.datatype;
4348 type_t *const type_left = skip_typeref(orig_type_left);
4349 type_t *const type_right = skip_typeref(orig_type_right);
4351 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4352 /* TODO: improve error message */
4353 if (is_type_valid(type_left) && is_type_valid(type_right)) {
4354 errorf(HERE, "operation needs scalar types");
4359 expression->expression.datatype = type_int;
4363 * Checks if a compound type has constant fields.
4365 static bool has_const_fields(const compound_type_t *type)
4367 const context_t *context = &type->declaration->context;
4368 const declaration_t *declaration = context->declarations;
4370 for (; declaration != NULL; declaration = declaration->next) {
4371 if (declaration->namespc != NAMESPACE_NORMAL)
4374 const type_t *decl_type = skip_typeref(declaration->type);
4375 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4383 * Check the semantic restrictions of a binary assign expression.
4385 static void semantic_binexpr_assign(binary_expression_t *expression)
4387 expression_t *left = expression->left;
4388 type_t *orig_type_left = left->base.datatype;
4390 type_t *type_left = revert_automatic_type_conversion(left);
4391 type_left = skip_typeref(orig_type_left);
4393 /* must be a modifiable lvalue */
4394 if (is_type_array(type_left)) {
4395 errorf(HERE, "cannot assign to arrays ('%E')", left);
4398 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4399 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4403 if(is_type_incomplete(type_left)) {
4405 "left-hand side of assignment '%E' has incomplete type '%T'",
4406 left, orig_type_left);
4409 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4410 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4411 left, orig_type_left);
4415 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
4417 if (res_type == NULL) {
4418 errorf(expression->expression.source_position,
4419 "cannot assign to '%T' from '%T'",
4420 orig_type_left, expression->right->base.datatype);
4422 expression->right = create_implicit_cast(expression->right, res_type);
4425 expression->expression.datatype = orig_type_left;
4428 static bool expression_has_effect(const expression_t *const expr)
4430 switch (expr->kind) {
4431 case EXPR_UNKNOWN: break;
4432 case EXPR_INVALID: break;
4433 case EXPR_REFERENCE: return false;
4434 case EXPR_CONST: return false;
4435 case EXPR_STRING_LITERAL: return false;
4436 case EXPR_WIDE_STRING_LITERAL: return false;
4438 const call_expression_t *const call = &expr->call;
4439 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
4442 switch (call->function->builtin_symbol.symbol->ID) {
4443 case T___builtin_va_end: return true;
4444 default: return false;
4447 case EXPR_CONDITIONAL: {
4448 const conditional_expression_t *const cond = &expr->conditional;
4450 expression_has_effect(cond->true_expression) &&
4451 expression_has_effect(cond->false_expression);
4453 case EXPR_SELECT: return false;
4454 case EXPR_ARRAY_ACCESS: return false;
4455 case EXPR_SIZEOF: return false;
4456 case EXPR_CLASSIFY_TYPE: return false;
4457 case EXPR_ALIGNOF: return false;
4459 case EXPR_FUNCTION: return false;
4460 case EXPR_PRETTY_FUNCTION: return false;
4461 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
4462 case EXPR_BUILTIN_CONSTANT_P: return false;
4463 case EXPR_BUILTIN_PREFETCH: return true;
4464 case EXPR_OFFSETOF: return false;
4465 case EXPR_VA_START: return true;
4466 case EXPR_VA_ARG: return true;
4467 case EXPR_STATEMENT: return true; // TODO
4469 case EXPR_UNARY_NEGATE: return false;
4470 case EXPR_UNARY_PLUS: return false;
4471 case EXPR_UNARY_BITWISE_NEGATE: return false;
4472 case EXPR_UNARY_NOT: return false;
4473 case EXPR_UNARY_DEREFERENCE: return false;
4474 case EXPR_UNARY_TAKE_ADDRESS: return false;
4475 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
4476 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
4477 case EXPR_UNARY_PREFIX_INCREMENT: return true;
4478 case EXPR_UNARY_PREFIX_DECREMENT: return true;
4479 case EXPR_UNARY_CAST:
4480 return is_type_atomic(expr->base.datatype, ATOMIC_TYPE_VOID);
4481 case EXPR_UNARY_CAST_IMPLICIT: return true;
4482 case EXPR_UNARY_ASSUME: return true;
4483 case EXPR_UNARY_BITFIELD_EXTRACT: return false;
4485 case EXPR_BINARY_ADD: return false;
4486 case EXPR_BINARY_SUB: return false;
4487 case EXPR_BINARY_MUL: return false;
4488 case EXPR_BINARY_DIV: return false;
4489 case EXPR_BINARY_MOD: return false;
4490 case EXPR_BINARY_EQUAL: return false;
4491 case EXPR_BINARY_NOTEQUAL: return false;
4492 case EXPR_BINARY_LESS: return false;
4493 case EXPR_BINARY_LESSEQUAL: return false;
4494 case EXPR_BINARY_GREATER: return false;
4495 case EXPR_BINARY_GREATEREQUAL: return false;
4496 case EXPR_BINARY_BITWISE_AND: return false;
4497 case EXPR_BINARY_BITWISE_OR: return false;
4498 case EXPR_BINARY_BITWISE_XOR: return false;
4499 case EXPR_BINARY_SHIFTLEFT: return false;
4500 case EXPR_BINARY_SHIFTRIGHT: return false;
4501 case EXPR_BINARY_ASSIGN: return true;
4502 case EXPR_BINARY_MUL_ASSIGN: return true;
4503 case EXPR_BINARY_DIV_ASSIGN: return true;
4504 case EXPR_BINARY_MOD_ASSIGN: return true;
4505 case EXPR_BINARY_ADD_ASSIGN: return true;
4506 case EXPR_BINARY_SUB_ASSIGN: return true;
4507 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
4508 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
4509 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
4510 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
4511 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
4512 case EXPR_BINARY_LOGICAL_AND:
4513 case EXPR_BINARY_LOGICAL_OR:
4514 case EXPR_BINARY_COMMA:
4515 return expression_has_effect(expr->binary.right);
4517 case EXPR_BINARY_BUILTIN_EXPECT: return true;
4518 case EXPR_BINARY_ISGREATER: return false;
4519 case EXPR_BINARY_ISGREATEREQUAL: return false;
4520 case EXPR_BINARY_ISLESS: return false;
4521 case EXPR_BINARY_ISLESSEQUAL: return false;
4522 case EXPR_BINARY_ISLESSGREATER: return false;
4523 case EXPR_BINARY_ISUNORDERED: return false;
4526 panic("unexpected statement");
4529 static void semantic_comma(binary_expression_t *expression)
4531 if (warning.unused_value) {
4532 const expression_t *const left = expression->left;
4533 if (!expression_has_effect(left)) {
4534 warningf(left->base.source_position, "left-hand operand of comma expression has no effect");
4537 expression->expression.datatype = expression->right->base.datatype;
4540 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4541 static expression_t *parse_##binexpression_type(unsigned precedence, \
4542 expression_t *left) \
4546 expression_t *right = parse_sub_expression(precedence + lr); \
4548 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4549 binexpr->binary.left = left; \
4550 binexpr->binary.right = right; \
4551 sfunc(&binexpr->binary); \
4556 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4557 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4558 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4559 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4560 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4561 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4562 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4563 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4564 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4566 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4567 semantic_comparison, 1)
4568 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4569 semantic_comparison, 1)
4570 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4571 semantic_comparison, 1)
4572 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4573 semantic_comparison, 1)
4575 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4576 semantic_binexpr_arithmetic, 1)
4577 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4578 semantic_binexpr_arithmetic, 1)
4579 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4580 semantic_binexpr_arithmetic, 1)
4581 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4582 semantic_logical_op, 1)
4583 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4584 semantic_logical_op, 1)
4585 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4586 semantic_shift_op, 1)
4587 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4588 semantic_shift_op, 1)
4589 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4590 semantic_arithmetic_addsubb_assign, 0)
4591 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4592 semantic_arithmetic_addsubb_assign, 0)
4593 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4594 semantic_arithmetic_assign, 0)
4595 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4596 semantic_arithmetic_assign, 0)
4597 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4598 semantic_arithmetic_assign, 0)
4599 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4600 semantic_arithmetic_assign, 0)
4601 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4602 semantic_arithmetic_assign, 0)
4603 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4604 semantic_arithmetic_assign, 0)
4605 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4606 semantic_arithmetic_assign, 0)
4607 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4608 semantic_arithmetic_assign, 0)
4610 static expression_t *parse_sub_expression(unsigned precedence)
4612 if(token.type < 0) {
4613 return expected_expression_error();
4616 expression_parser_function_t *parser
4617 = &expression_parsers[token.type];
4618 source_position_t source_position = token.source_position;
4621 if(parser->parser != NULL) {
4622 left = parser->parser(parser->precedence);
4624 left = parse_primary_expression();
4626 assert(left != NULL);
4627 left->base.source_position = source_position;
4630 if(token.type < 0) {
4631 return expected_expression_error();
4634 parser = &expression_parsers[token.type];
4635 if(parser->infix_parser == NULL)
4637 if(parser->infix_precedence < precedence)
4640 left = parser->infix_parser(parser->infix_precedence, left);
4642 assert(left != NULL);
4643 assert(left->kind != EXPR_UNKNOWN);
4644 left->base.source_position = source_position;
4651 * Parse an expression.
4653 static expression_t *parse_expression(void)
4655 return parse_sub_expression(1);
4659 * Register a parser for a prefix-like operator with given precedence.
4661 * @param parser the parser function
4662 * @param token_type the token type of the prefix token
4663 * @param precedence the precedence of the operator
4665 static void register_expression_parser(parse_expression_function parser,
4666 int token_type, unsigned precedence)
4668 expression_parser_function_t *entry = &expression_parsers[token_type];
4670 if(entry->parser != NULL) {
4671 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4672 panic("trying to register multiple expression parsers for a token");
4674 entry->parser = parser;
4675 entry->precedence = precedence;
4679 * Register a parser for an infix operator with given precedence.
4681 * @param parser the parser function
4682 * @param token_type the token type of the infix operator
4683 * @param precedence the precedence of the operator
4685 static void register_infix_parser(parse_expression_infix_function parser,
4686 int token_type, unsigned precedence)
4688 expression_parser_function_t *entry = &expression_parsers[token_type];
4690 if(entry->infix_parser != NULL) {
4691 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4692 panic("trying to register multiple infix expression parsers for a "
4695 entry->infix_parser = parser;
4696 entry->infix_precedence = precedence;
4700 * Initialize the expression parsers.
4702 static void init_expression_parsers(void)
4704 memset(&expression_parsers, 0, sizeof(expression_parsers));
4706 register_infix_parser(parse_array_expression, '[', 30);
4707 register_infix_parser(parse_call_expression, '(', 30);
4708 register_infix_parser(parse_select_expression, '.', 30);
4709 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4710 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4712 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4715 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4716 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4717 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4718 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4719 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4720 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4721 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4722 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4723 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4724 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4725 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4726 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4727 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4728 T_EXCLAMATIONMARKEQUAL, 13);
4729 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4730 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4731 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4732 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4733 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4734 register_infix_parser(parse_conditional_expression, '?', 7);
4735 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4736 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4737 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4738 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4739 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4740 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4741 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4742 T_LESSLESSEQUAL, 2);
4743 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4744 T_GREATERGREATEREQUAL, 2);
4745 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4747 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4749 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4752 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4754 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4755 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4756 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4757 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4758 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4759 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4760 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4762 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4764 register_expression_parser(parse_sizeof, T_sizeof, 25);
4765 register_expression_parser(parse_extension, T___extension__, 25);
4766 register_expression_parser(parse_builtin_classify_type,
4767 T___builtin_classify_type, 25);
4771 * Parse a asm statement constraints specification.
4773 static asm_constraint_t *parse_asm_constraints(void)
4775 asm_constraint_t *result = NULL;
4776 asm_constraint_t *last = NULL;
4778 while(token.type == T_STRING_LITERAL || token.type == '[') {
4779 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4780 memset(constraint, 0, sizeof(constraint[0]));
4782 if(token.type == '[') {
4784 if(token.type != T_IDENTIFIER) {
4785 parse_error_expected("while parsing asm constraint",
4789 constraint->symbol = token.v.symbol;
4794 constraint->constraints = parse_string_literals();
4796 constraint->expression = parse_expression();
4800 last->next = constraint;
4802 result = constraint;
4806 if(token.type != ',')
4815 * Parse a asm statement clobber specification.
4817 static asm_clobber_t *parse_asm_clobbers(void)
4819 asm_clobber_t *result = NULL;
4820 asm_clobber_t *last = NULL;
4822 while(token.type == T_STRING_LITERAL) {
4823 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4824 clobber->clobber = parse_string_literals();
4827 last->next = clobber;
4833 if(token.type != ',')
4842 * Parse an asm statement.
4844 static statement_t *parse_asm_statement(void)
4848 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4849 statement->base.source_position = token.source_position;
4851 asm_statement_t *asm_statement = &statement->asms;
4853 if(token.type == T_volatile) {
4855 asm_statement->is_volatile = true;
4859 asm_statement->asm_text = parse_string_literals();
4861 if(token.type != ':')
4865 asm_statement->inputs = parse_asm_constraints();
4866 if(token.type != ':')
4870 asm_statement->outputs = parse_asm_constraints();
4871 if(token.type != ':')
4875 asm_statement->clobbers = parse_asm_clobbers();
4884 * Parse a case statement.
4886 static statement_t *parse_case_statement(void)
4890 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4892 statement->base.source_position = token.source_position;
4893 statement->case_label.expression = parse_expression();
4897 if (! is_constant_expression(statement->case_label.expression)) {
4898 errorf(statement->base.source_position,
4899 "case label does not reduce to an integer constant");
4901 /* TODO: check if the case label is already known */
4902 if (current_switch != NULL) {
4903 /* link all cases into the switch statement */
4904 if (current_switch->last_case == NULL) {
4905 current_switch->first_case =
4906 current_switch->last_case = &statement->case_label;
4908 current_switch->last_case->next = &statement->case_label;
4911 errorf(statement->base.source_position,
4912 "case label not within a switch statement");
4915 statement->case_label.label_statement = parse_statement();
4921 * Finds an existing default label of a switch statement.
4923 static case_label_statement_t *
4924 find_default_label(const switch_statement_t *statement)
4926 for (case_label_statement_t *label = statement->first_case;
4928 label = label->next) {
4929 if (label->expression == NULL)
4936 * Parse a default statement.
4938 static statement_t *parse_default_statement(void)
4942 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4944 statement->base.source_position = token.source_position;
4947 if (current_switch != NULL) {
4948 const case_label_statement_t *def_label = find_default_label(current_switch);
4949 if (def_label != NULL) {
4950 errorf(HERE, "multiple default labels in one switch");
4951 errorf(def_label->statement.source_position,
4952 "this is the first default label");
4954 /* link all cases into the switch statement */
4955 if (current_switch->last_case == NULL) {
4956 current_switch->first_case =
4957 current_switch->last_case = &statement->case_label;
4959 current_switch->last_case->next = &statement->case_label;
4963 errorf(statement->base.source_position,
4964 "'default' label not within a switch statement");
4966 statement->label.label_statement = parse_statement();
4972 * Return the declaration for a given label symbol or create a new one.
4974 static declaration_t *get_label(symbol_t *symbol)
4976 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4977 assert(current_function != NULL);
4978 /* if we found a label in the same function, then we already created the
4980 if(candidate != NULL
4981 && candidate->parent_context == ¤t_function->context) {
4985 /* otherwise we need to create a new one */
4986 declaration_t *const declaration = allocate_declaration_zero();
4987 declaration->namespc = NAMESPACE_LABEL;
4988 declaration->symbol = symbol;
4990 label_push(declaration);
4996 * Parse a label statement.
4998 static statement_t *parse_label_statement(void)
5000 assert(token.type == T_IDENTIFIER);
5001 symbol_t *symbol = token.v.symbol;
5004 declaration_t *label = get_label(symbol);
5006 /* if source position is already set then the label is defined twice,
5007 * otherwise it was just mentioned in a goto so far */
5008 if(label->source_position.input_name != NULL) {
5009 errorf(HERE, "duplicate label '%Y'", symbol);
5010 errorf(label->source_position, "previous definition of '%Y' was here",
5013 label->source_position = token.source_position;
5016 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
5018 label_statement->statement.kind = STATEMENT_LABEL;
5019 label_statement->statement.source_position = token.source_position;
5020 label_statement->label = label;
5024 if(token.type == '}') {
5025 /* TODO only warn? */
5026 errorf(HERE, "label at end of compound statement");
5027 return (statement_t*) label_statement;
5029 if (token.type == ';') {
5030 /* eat an empty statement here, to avoid the warning about an empty
5031 * after a label. label:; is commonly used to have a label before
5035 label_statement->label_statement = parse_statement();
5039 return (statement_t*) label_statement;
5043 * Parse an if statement.
5045 static statement_t *parse_if(void)
5049 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5050 statement->statement.kind = STATEMENT_IF;
5051 statement->statement.source_position = token.source_position;
5054 statement->condition = parse_expression();
5057 statement->true_statement = parse_statement();
5058 if(token.type == T_else) {
5060 statement->false_statement = parse_statement();
5063 return (statement_t*) statement;
5067 * Parse a switch statement.
5069 static statement_t *parse_switch(void)
5073 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5074 statement->statement.kind = STATEMENT_SWITCH;
5075 statement->statement.source_position = token.source_position;
5078 expression_t *const expr = parse_expression();
5079 type_t * type = skip_typeref(expr->base.datatype);
5080 if (is_type_integer(type)) {
5081 type = promote_integer(type);
5082 } else if (is_type_valid(type)) {
5083 errorf(expr->base.source_position, "switch quantity is not an integer, but '%T'", type);
5084 type = type_error_type;
5086 statement->expression = create_implicit_cast(expr, type);
5089 switch_statement_t *rem = current_switch;
5090 current_switch = statement;
5091 statement->body = parse_statement();
5092 current_switch = rem;
5094 if (warning.switch_default && find_default_label(statement) == NULL) {
5095 warningf(statement->statement.source_position, "switch has no default case");
5098 return (statement_t*) statement;
5101 static statement_t *parse_loop_body(statement_t *const loop)
5103 statement_t *const rem = current_loop;
5104 current_loop = loop;
5105 statement_t *const body = parse_statement();
5111 * Parse a while statement.
5113 static statement_t *parse_while(void)
5117 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5118 statement->statement.kind = STATEMENT_WHILE;
5119 statement->statement.source_position = token.source_position;
5122 statement->condition = parse_expression();
5125 statement->body = parse_loop_body((statement_t*)statement);
5127 return (statement_t*) statement;
5131 * Parse a do statement.
5133 static statement_t *parse_do(void)
5137 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5138 statement->statement.kind = STATEMENT_DO_WHILE;
5139 statement->statement.source_position = token.source_position;
5141 statement->body = parse_loop_body((statement_t*)statement);
5144 statement->condition = parse_expression();
5148 return (statement_t*) statement;
5152 * Parse a for statement.
5154 static statement_t *parse_for(void)
5158 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5159 statement->statement.kind = STATEMENT_FOR;
5160 statement->statement.source_position = token.source_position;
5164 int top = environment_top();
5165 context_t *last_context = context;
5166 set_context(&statement->context);
5168 if(token.type != ';') {
5169 if(is_declaration_specifier(&token, false)) {
5170 parse_declaration(record_declaration);
5172 statement->initialisation = parse_expression();
5179 if(token.type != ';') {
5180 statement->condition = parse_expression();
5183 if(token.type != ')') {
5184 statement->step = parse_expression();
5187 statement->body = parse_loop_body((statement_t*)statement);
5189 assert(context == &statement->context);
5190 set_context(last_context);
5191 environment_pop_to(top);
5193 return (statement_t*) statement;
5197 * Parse a goto statement.
5199 static statement_t *parse_goto(void)
5203 if(token.type != T_IDENTIFIER) {
5204 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5208 symbol_t *symbol = token.v.symbol;
5211 declaration_t *label = get_label(symbol);
5213 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5215 statement->statement.kind = STATEMENT_GOTO;
5216 statement->statement.source_position = token.source_position;
5218 statement->label = label;
5220 /* remember the goto's in a list for later checking */
5221 if (goto_last == NULL) {
5222 goto_first = goto_last = statement;
5224 goto_last->next = statement;
5229 return (statement_t*) statement;
5233 * Parse a continue statement.
5235 static statement_t *parse_continue(void)
5237 statement_t *statement;
5238 if (current_loop == NULL) {
5239 errorf(HERE, "continue statement not within loop");
5242 statement = allocate_statement_zero(STATEMENT_CONTINUE);
5244 statement->base.source_position = token.source_position;
5254 * Parse a break statement.
5256 static statement_t *parse_break(void)
5258 statement_t *statement;
5259 if (current_switch == NULL && current_loop == NULL) {
5260 errorf(HERE, "break statement not within loop or switch");
5263 statement = allocate_statement_zero(STATEMENT_BREAK);
5265 statement->base.source_position = token.source_position;
5275 * Check if a given declaration represents a local variable.
5277 static bool is_local_var_declaration(const declaration_t *declaration) {
5278 switch ((storage_class_tag_t) declaration->storage_class) {
5279 case STORAGE_CLASS_NONE:
5280 case STORAGE_CLASS_AUTO:
5281 case STORAGE_CLASS_REGISTER: {
5282 const type_t *type = skip_typeref(declaration->type);
5283 if(is_type_function(type)) {
5295 * Check if a given expression represents a local variable.
5297 static bool is_local_variable(const expression_t *expression)
5299 if (expression->base.kind != EXPR_REFERENCE) {
5302 const declaration_t *declaration = expression->reference.declaration;
5303 return is_local_var_declaration(declaration);
5307 * Parse a return statement.
5309 static statement_t *parse_return(void)
5313 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5315 statement->statement.kind = STATEMENT_RETURN;
5316 statement->statement.source_position = token.source_position;
5318 expression_t *return_value = NULL;
5319 if(token.type != ';') {
5320 return_value = parse_expression();
5324 const type_t *const func_type = current_function->type;
5325 assert(is_type_function(func_type));
5326 type_t *const return_type = skip_typeref(func_type->function.return_type);
5328 if(return_value != NULL) {
5329 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5331 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5332 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5333 warningf(statement->statement.source_position,
5334 "'return' with a value, in function returning void");
5335 return_value = NULL;
5337 type_t *const res_type = semantic_assign(return_type,
5338 return_value, "'return'");
5339 if (res_type == NULL) {
5340 errorf(statement->statement.source_position,
5341 "cannot return something of type '%T' in function returning '%T'",
5342 return_value->base.datatype, return_type);
5344 return_value = create_implicit_cast(return_value, res_type);
5347 /* check for returning address of a local var */
5348 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
5349 const expression_t *expression = return_value->unary.value;
5350 if (is_local_variable(expression)) {
5351 warningf(statement->statement.source_position,
5352 "function returns address of local variable");
5356 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5357 warningf(statement->statement.source_position,
5358 "'return' without value, in function returning non-void");
5361 statement->return_value = return_value;
5363 return (statement_t*) statement;
5367 * Parse a declaration statement.
5369 static statement_t *parse_declaration_statement(void)
5371 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5373 statement->base.source_position = token.source_position;
5375 declaration_t *before = last_declaration;
5376 parse_declaration(record_declaration);
5378 if(before == NULL) {
5379 statement->declaration.declarations_begin = context->declarations;
5381 statement->declaration.declarations_begin = before->next;
5383 statement->declaration.declarations_end = last_declaration;
5389 * Parse an expression statement, ie. expr ';'.
5391 static statement_t *parse_expression_statement(void)
5393 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5395 statement->base.source_position = token.source_position;
5396 expression_t *const expr = parse_expression();
5397 statement->expression.expression = expr;
5399 if (warning.unused_value && !expression_has_effect(expr)) {
5400 warningf(expr->base.source_position, "statement has no effect");
5409 * Parse a statement.
5411 static statement_t *parse_statement(void)
5413 statement_t *statement = NULL;
5415 /* declaration or statement */
5416 switch(token.type) {
5418 statement = parse_asm_statement();
5422 statement = parse_case_statement();
5426 statement = parse_default_statement();
5430 statement = parse_compound_statement();
5434 statement = parse_if();
5438 statement = parse_switch();
5442 statement = parse_while();
5446 statement = parse_do();
5450 statement = parse_for();
5454 statement = parse_goto();
5458 statement = parse_continue();
5462 statement = parse_break();
5466 statement = parse_return();
5470 if (warning.empty_statement) {
5471 warningf(HERE, "statement is empty");
5478 if(look_ahead(1)->type == ':') {
5479 statement = parse_label_statement();
5483 if(is_typedef_symbol(token.v.symbol)) {
5484 statement = parse_declaration_statement();
5488 statement = parse_expression_statement();
5491 case T___extension__:
5492 /* this can be a prefix to a declaration or an expression statement */
5493 /* we simply eat it now and parse the rest with tail recursion */
5496 } while(token.type == T___extension__);
5497 statement = parse_statement();
5501 statement = parse_declaration_statement();
5505 statement = parse_expression_statement();
5509 assert(statement == NULL
5510 || statement->base.source_position.input_name != NULL);
5516 * Parse a compound statement.
5518 static statement_t *parse_compound_statement(void)
5520 compound_statement_t *const compound_statement
5521 = allocate_ast_zero(sizeof(compound_statement[0]));
5522 compound_statement->statement.kind = STATEMENT_COMPOUND;
5523 compound_statement->statement.source_position = token.source_position;
5527 int top = environment_top();
5528 context_t *last_context = context;
5529 set_context(&compound_statement->context);
5531 statement_t *last_statement = NULL;
5533 while(token.type != '}' && token.type != T_EOF) {
5534 statement_t *statement = parse_statement();
5535 if(statement == NULL)
5538 if(last_statement != NULL) {
5539 last_statement->base.next = statement;
5541 compound_statement->statements = statement;
5544 while(statement->base.next != NULL)
5545 statement = statement->base.next;
5547 last_statement = statement;
5550 if(token.type == '}') {
5553 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5556 assert(context == &compound_statement->context);
5557 set_context(last_context);
5558 environment_pop_to(top);
5560 return (statement_t*) compound_statement;
5564 * Initialize builtin types.
5566 static void initialize_builtin_types(void)
5568 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5569 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5570 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5571 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5572 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5573 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5574 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5575 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5577 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5578 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5579 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5580 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5584 * Parse a translation unit.
5586 static translation_unit_t *parse_translation_unit(void)
5588 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5590 assert(global_context == NULL);
5591 global_context = &unit->context;
5593 assert(context == NULL);
5594 set_context(&unit->context);
5596 initialize_builtin_types();
5598 while(token.type != T_EOF) {
5599 if (token.type == ';') {
5600 /* TODO error in strict mode */
5601 warningf(HERE, "stray ';' outside of function");
5604 parse_external_declaration();
5608 assert(context == &unit->context);
5610 last_declaration = NULL;
5612 assert(global_context == &unit->context);
5613 global_context = NULL;
5621 * @return the translation unit or NULL if errors occurred.
5623 translation_unit_t *parse(void)
5625 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5626 label_stack = NEW_ARR_F(stack_entry_t, 0);
5627 diagnostic_count = 0;
5631 type_set_output(stderr);
5632 ast_set_output(stderr);
5634 lookahead_bufpos = 0;
5635 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5638 translation_unit_t *unit = parse_translation_unit();
5640 DEL_ARR_F(environment_stack);
5641 DEL_ARR_F(label_stack);
5650 * Initialize the parser.
5652 void init_parser(void)
5654 init_expression_parsers();
5655 obstack_init(&temp_obst);
5657 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5658 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5662 * Terminate the parser.
5664 void exit_parser(void)
5666 obstack_free(&temp_obst, NULL);