2 * This file is part of cparser.
3 * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27 #include "diagnostic.h"
28 #include "format_check.h"
34 #include "type_hash.h"
37 #include "lang_features.h"
38 #include "walk_statements.h"
40 #include "adt/bitfiddle.h"
41 #include "adt/error.h"
42 #include "adt/array.h"
44 //#define PRINT_TOKENS
45 #define MAX_LOOKAHEAD 2
50 entity_namespace_t namespc;
53 typedef struct argument_list_t argument_list_t;
54 struct argument_list_t {
56 argument_list_t *next;
59 typedef struct gnu_attribute_t gnu_attribute_t;
60 struct gnu_attribute_t {
61 gnu_attribute_kind_t kind; /**< The kind of the GNU attribute. */
62 gnu_attribute_t *next;
63 bool invalid; /**< Set if this attribute had argument errors, */
64 bool have_arguments; /**< True, if this attribute has arguments. */
68 atomic_type_kind_t akind;
69 long argument; /**< Single argument. */
70 argument_list_t *arguments; /**< List of argument expressions. */
74 typedef struct declaration_specifiers_t declaration_specifiers_t;
75 struct declaration_specifiers_t {
76 source_position_t source_position;
77 storage_class_t storage_class;
78 unsigned char alignment; /**< Alignment, 0 if not set. */
80 bool thread_local : 1; /**< GCC __thread */
82 decl_modifiers_t modifiers; /**< declaration modifiers */
83 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
84 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
85 symbol_t *get_property_sym; /**< the name of the get property if set. */
86 symbol_t *put_property_sym; /**< the name of the put property if set. */
91 * An environment for parsing initializers (and compound literals).
93 typedef struct parse_initializer_env_t {
94 type_t *type; /**< the type of the initializer. In case of an
95 array type with unspecified size this gets
96 adjusted to the actual size. */
97 entity_t *entity; /**< the variable that is initialized if any */
98 bool must_be_constant;
99 } parse_initializer_env_t;
102 * Capture a MS __base extension.
104 typedef struct based_spec_t {
105 source_position_t source_position;
106 variable_t *base_variable;
109 typedef entity_t* (*parsed_declaration_func) (entity_t *declaration, bool is_definition);
111 /** The current token. */
112 static token_t token;
113 /** The lookahead ring-buffer. */
114 static token_t lookahead_buffer[MAX_LOOKAHEAD];
115 /** Position of the next token in the lookahead buffer. */
116 static int lookahead_bufpos;
117 static stack_entry_t *environment_stack = NULL;
118 static stack_entry_t *label_stack = NULL;
119 static scope_t *file_scope = NULL;
120 static scope_t *current_scope = NULL;
121 /** Point to the current function declaration if inside a function. */
122 static function_t *current_function = NULL;
123 static entity_t *current_init_decl = NULL;
124 static switch_statement_t *current_switch = NULL;
125 static statement_t *current_loop = NULL;
126 static statement_t *current_parent = NULL;
127 static ms_try_statement_t *current_try = NULL;
128 static linkage_kind_t current_linkage = LINKAGE_INVALID;
129 static goto_statement_t *goto_first = NULL;
130 static goto_statement_t **goto_anchor = NULL;
131 static label_statement_t *label_first = NULL;
132 static label_statement_t **label_anchor = NULL;
133 /** current translation unit. */
134 static translation_unit_t *unit = NULL;
135 /** true if we are in a type property context (evaluation only for type. */
136 static bool in_type_prop = false;
137 /** true in we are in a __extension__ context. */
138 static bool in_gcc_extension = false;
139 static struct obstack temp_obst;
140 static entity_t *anonymous_entity;
141 static declaration_t **incomplete_arrays;
144 #define PUSH_PARENT(stmt) \
145 statement_t *const prev_parent = current_parent; \
146 ((void)(current_parent = (stmt)))
147 #define POP_PARENT ((void)(current_parent = prev_parent))
149 /** special symbol used for anonymous entities. */
150 static const symbol_t *sym_anonymous = NULL;
152 /* symbols for Microsoft extended-decl-modifier */
153 static const symbol_t *sym_align = NULL;
154 static const symbol_t *sym_allocate = NULL;
155 static const symbol_t *sym_dllimport = NULL;
156 static const symbol_t *sym_dllexport = NULL;
157 static const symbol_t *sym_naked = NULL;
158 static const symbol_t *sym_noinline = NULL;
159 static const symbol_t *sym_noreturn = NULL;
160 static const symbol_t *sym_nothrow = NULL;
161 static const symbol_t *sym_novtable = NULL;
162 static const symbol_t *sym_property = NULL;
163 static const symbol_t *sym_get = NULL;
164 static const symbol_t *sym_put = NULL;
165 static const symbol_t *sym_selectany = NULL;
166 static const symbol_t *sym_thread = NULL;
167 static const symbol_t *sym_uuid = NULL;
168 static const symbol_t *sym_deprecated = NULL;
169 static const symbol_t *sym_restrict = NULL;
170 static const symbol_t *sym_noalias = NULL;
172 /** The token anchor set */
173 static unsigned char token_anchor_set[T_LAST_TOKEN];
175 /** The current source position. */
176 #define HERE (&token.source_position)
178 /** true if we are in GCC mode. */
179 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
181 static type_t *type_valist;
183 static statement_t *parse_compound_statement(bool inside_expression_statement);
184 static statement_t *parse_statement(void);
186 static expression_t *parse_sub_expression(precedence_t);
187 static expression_t *parse_expression(void);
188 static type_t *parse_typename(void);
189 static void parse_externals(void);
190 static void parse_external(void);
192 static void parse_compound_type_entries(compound_t *compound_declaration);
194 typedef enum declarator_flags_t {
196 DECL_MAY_BE_ABSTRACT = 1U << 0,
197 DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
198 DECL_IS_PARAMETER = 1U << 2
199 } declarator_flags_t;
201 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
202 declarator_flags_t flags);
204 static entity_t *record_entity(entity_t *entity, bool is_definition);
206 static void semantic_comparison(binary_expression_t *expression);
208 #define STORAGE_CLASSES \
209 STORAGE_CLASSES_NO_EXTERN \
212 #define STORAGE_CLASSES_NO_EXTERN \
219 #define TYPE_QUALIFIERS \
224 case T__forceinline: \
225 case T___attribute__:
227 #define COMPLEX_SPECIFIERS \
229 #define IMAGINARY_SPECIFIERS \
232 #define TYPE_SPECIFIERS \
234 case T___builtin_va_list: \
253 #define DECLARATION_START \
258 #define DECLARATION_START_NO_EXTERN \
259 STORAGE_CLASSES_NO_EXTERN \
263 #define TYPENAME_START \
267 #define EXPRESSION_START \
276 case T_CHARACTER_CONSTANT: \
277 case T_FLOATINGPOINT: \
281 case T_STRING_LITERAL: \
282 case T_WIDE_CHARACTER_CONSTANT: \
283 case T_WIDE_STRING_LITERAL: \
284 case T___FUNCDNAME__: \
285 case T___FUNCSIG__: \
286 case T___FUNCTION__: \
287 case T___PRETTY_FUNCTION__: \
288 case T___alignof__: \
289 case T___builtin_alloca: \
290 case T___builtin_classify_type: \
291 case T___builtin_constant_p: \
292 case T___builtin_expect: \
293 case T___builtin_huge_val: \
294 case T___builtin_inf: \
295 case T___builtin_inff: \
296 case T___builtin_infl: \
297 case T___builtin_isgreater: \
298 case T___builtin_isgreaterequal: \
299 case T___builtin_isless: \
300 case T___builtin_islessequal: \
301 case T___builtin_islessgreater: \
302 case T___builtin_isunordered: \
303 case T___builtin_nan: \
304 case T___builtin_nanf: \
305 case T___builtin_nanl: \
306 case T___builtin_offsetof: \
307 case T___builtin_prefetch: \
308 case T___builtin_va_arg: \
309 case T___builtin_va_end: \
310 case T___builtin_va_start: \
321 * Allocate an AST node with given size and
322 * initialize all fields with zero.
324 static void *allocate_ast_zero(size_t size)
326 void *res = allocate_ast(size);
327 memset(res, 0, size);
332 * Returns the size of an entity node.
334 * @param kind the entity kind
336 static size_t get_entity_struct_size(entity_kind_t kind)
338 static const size_t sizes[] = {
339 [ENTITY_VARIABLE] = sizeof(variable_t),
340 [ENTITY_PARAMETER] = sizeof(parameter_t),
341 [ENTITY_COMPOUND_MEMBER] = sizeof(compound_member_t),
342 [ENTITY_FUNCTION] = sizeof(function_t),
343 [ENTITY_TYPEDEF] = sizeof(typedef_t),
344 [ENTITY_STRUCT] = sizeof(compound_t),
345 [ENTITY_UNION] = sizeof(compound_t),
346 [ENTITY_ENUM] = sizeof(enum_t),
347 [ENTITY_ENUM_VALUE] = sizeof(enum_value_t),
348 [ENTITY_LABEL] = sizeof(label_t),
349 [ENTITY_LOCAL_LABEL] = sizeof(label_t),
350 [ENTITY_NAMESPACE] = sizeof(namespace_t)
352 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
353 assert(sizes[kind] != 0);
358 * Allocate an entity of given kind and initialize all
361 static entity_t *allocate_entity_zero(entity_kind_t kind)
363 size_t size = get_entity_struct_size(kind);
364 entity_t *entity = allocate_ast_zero(size);
370 * Returns the size of a statement node.
372 * @param kind the statement kind
374 static size_t get_statement_struct_size(statement_kind_t kind)
376 static const size_t sizes[] = {
377 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
378 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
379 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
380 [STATEMENT_RETURN] = sizeof(return_statement_t),
381 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
382 [STATEMENT_LOCAL_LABEL] = sizeof(local_label_statement_t),
383 [STATEMENT_IF] = sizeof(if_statement_t),
384 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
385 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
386 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
387 [STATEMENT_BREAK] = sizeof(statement_base_t),
388 [STATEMENT_GOTO] = sizeof(goto_statement_t),
389 [STATEMENT_LABEL] = sizeof(label_statement_t),
390 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
391 [STATEMENT_WHILE] = sizeof(while_statement_t),
392 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
393 [STATEMENT_FOR] = sizeof(for_statement_t),
394 [STATEMENT_ASM] = sizeof(asm_statement_t),
395 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
396 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
398 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
399 assert(sizes[kind] != 0);
404 * Returns the size of an expression node.
406 * @param kind the expression kind
408 static size_t get_expression_struct_size(expression_kind_t kind)
410 static const size_t sizes[] = {
411 [EXPR_INVALID] = sizeof(expression_base_t),
412 [EXPR_REFERENCE] = sizeof(reference_expression_t),
413 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
414 [EXPR_CONST] = sizeof(const_expression_t),
415 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
416 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
417 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
418 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
419 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
420 [EXPR_CALL] = sizeof(call_expression_t),
421 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
422 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
423 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
424 [EXPR_SELECT] = sizeof(select_expression_t),
425 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
426 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
427 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
428 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
429 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
430 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
431 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
432 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
433 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
434 [EXPR_VA_START] = sizeof(va_start_expression_t),
435 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
436 [EXPR_STATEMENT] = sizeof(statement_expression_t),
437 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
439 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
440 return sizes[EXPR_UNARY_FIRST];
442 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
443 return sizes[EXPR_BINARY_FIRST];
445 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
446 assert(sizes[kind] != 0);
451 * Allocate a statement node of given kind and initialize all
452 * fields with zero. Sets its source position to the position
453 * of the current token.
455 static statement_t *allocate_statement_zero(statement_kind_t kind)
457 size_t size = get_statement_struct_size(kind);
458 statement_t *res = allocate_ast_zero(size);
460 res->base.kind = kind;
461 res->base.parent = current_parent;
462 res->base.source_position = token.source_position;
467 * Allocate an expression node of given kind and initialize all
470 static expression_t *allocate_expression_zero(expression_kind_t kind)
472 size_t size = get_expression_struct_size(kind);
473 expression_t *res = allocate_ast_zero(size);
475 res->base.kind = kind;
476 res->base.type = type_error_type;
477 res->base.source_position = token.source_position;
482 * Creates a new invalid expression at the source position
483 * of the current token.
485 static expression_t *create_invalid_expression(void)
487 return allocate_expression_zero(EXPR_INVALID);
491 * Creates a new invalid statement.
493 static statement_t *create_invalid_statement(void)
495 return allocate_statement_zero(STATEMENT_INVALID);
499 * Allocate a new empty statement.
501 static statement_t *create_empty_statement(void)
503 return allocate_statement_zero(STATEMENT_EMPTY);
507 * Returns the size of a type node.
509 * @param kind the type kind
511 static size_t get_type_struct_size(type_kind_t kind)
513 static const size_t sizes[] = {
514 [TYPE_ATOMIC] = sizeof(atomic_type_t),
515 [TYPE_COMPLEX] = sizeof(complex_type_t),
516 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
517 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
518 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
519 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
520 [TYPE_ENUM] = sizeof(enum_type_t),
521 [TYPE_FUNCTION] = sizeof(function_type_t),
522 [TYPE_POINTER] = sizeof(pointer_type_t),
523 [TYPE_ARRAY] = sizeof(array_type_t),
524 [TYPE_BUILTIN] = sizeof(builtin_type_t),
525 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
526 [TYPE_TYPEOF] = sizeof(typeof_type_t),
528 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
529 assert(kind <= TYPE_TYPEOF);
530 assert(sizes[kind] != 0);
535 * Allocate a type node of given kind and initialize all
538 * @param kind type kind to allocate
540 static type_t *allocate_type_zero(type_kind_t kind)
542 size_t size = get_type_struct_size(kind);
543 type_t *res = obstack_alloc(type_obst, size);
544 memset(res, 0, size);
545 res->base.kind = kind;
551 * Returns the size of an initializer node.
553 * @param kind the initializer kind
555 static size_t get_initializer_size(initializer_kind_t kind)
557 static const size_t sizes[] = {
558 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
559 [INITIALIZER_STRING] = sizeof(initializer_string_t),
560 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
561 [INITIALIZER_LIST] = sizeof(initializer_list_t),
562 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
564 assert(kind < sizeof(sizes) / sizeof(*sizes));
565 assert(sizes[kind] != 0);
570 * Allocate an initializer node of given kind and initialize all
573 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
575 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
582 * Free a type from the type obstack.
584 static void free_type(void *type)
586 obstack_free(type_obst, type);
590 * Returns the index of the top element of the environment stack.
592 static size_t environment_top(void)
594 return ARR_LEN(environment_stack);
598 * Returns the index of the top element of the global label stack.
600 static size_t label_top(void)
602 return ARR_LEN(label_stack);
606 * Return the next token.
608 static inline void next_token(void)
610 token = lookahead_buffer[lookahead_bufpos];
611 lookahead_buffer[lookahead_bufpos] = lexer_token;
614 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
617 print_token(stderr, &token);
618 fprintf(stderr, "\n");
623 * Return the next token with a given lookahead.
625 static inline const token_t *look_ahead(int num)
627 assert(num > 0 && num <= MAX_LOOKAHEAD);
628 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
629 return &lookahead_buffer[pos];
633 * Adds a token type to the token type anchor set (a multi-set).
635 static void add_anchor_token(int token_type)
637 assert(0 <= token_type && token_type < T_LAST_TOKEN);
638 ++token_anchor_set[token_type];
642 * Set the number of tokens types of the given type
643 * to zero and return the old count.
645 static int save_and_reset_anchor_state(int token_type)
647 assert(0 <= token_type && token_type < T_LAST_TOKEN);
648 int count = token_anchor_set[token_type];
649 token_anchor_set[token_type] = 0;
654 * Restore the number of token types to the given count.
656 static void restore_anchor_state(int token_type, int count)
658 assert(0 <= token_type && token_type < T_LAST_TOKEN);
659 token_anchor_set[token_type] = count;
663 * Remove a token type from the token type anchor set (a multi-set).
665 static void rem_anchor_token(int token_type)
667 assert(0 <= token_type && token_type < T_LAST_TOKEN);
668 assert(token_anchor_set[token_type] != 0);
669 --token_anchor_set[token_type];
673 * Return true if the token type of the current token is
676 static bool at_anchor(void)
680 return token_anchor_set[token.type];
684 * Eat tokens until a matching token type is found.
686 static void eat_until_matching_token(int type)
690 case '(': end_token = ')'; break;
691 case '{': end_token = '}'; break;
692 case '[': end_token = ']'; break;
693 default: end_token = type; break;
696 unsigned parenthesis_count = 0;
697 unsigned brace_count = 0;
698 unsigned bracket_count = 0;
699 while (token.type != end_token ||
700 parenthesis_count != 0 ||
702 bracket_count != 0) {
703 switch (token.type) {
705 case '(': ++parenthesis_count; break;
706 case '{': ++brace_count; break;
707 case '[': ++bracket_count; break;
710 if (parenthesis_count > 0)
720 if (bracket_count > 0)
723 if (token.type == end_token &&
724 parenthesis_count == 0 &&
738 * Eat input tokens until an anchor is found.
740 static void eat_until_anchor(void)
742 while (token_anchor_set[token.type] == 0) {
743 if (token.type == '(' || token.type == '{' || token.type == '[')
744 eat_until_matching_token(token.type);
750 * Eat a whole block from input tokens.
752 static void eat_block(void)
754 eat_until_matching_token('{');
755 if (token.type == '}')
759 #define eat(token_type) do { assert(token.type == (token_type)); next_token(); } while (0)
762 * Report a parse error because an expected token was not found.
765 #if defined __GNUC__ && __GNUC__ >= 4
766 __attribute__((sentinel))
768 void parse_error_expected(const char *message, ...)
770 if (message != NULL) {
771 errorf(HERE, "%s", message);
774 va_start(ap, message);
775 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
780 * Report an incompatible type.
782 static void type_error_incompatible(const char *msg,
783 const source_position_t *source_position, type_t *type1, type_t *type2)
785 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
790 * Expect the current token is the expected token.
791 * If not, generate an error, eat the current statement,
792 * and goto the end_error label.
794 #define expect(expected) \
796 if (UNLIKELY(token.type != (expected))) { \
797 parse_error_expected(NULL, (expected), NULL); \
798 add_anchor_token(expected); \
799 eat_until_anchor(); \
800 if (token.type == expected) \
802 rem_anchor_token(expected); \
809 * Push a given scope on the scope stack and make it the
812 static scope_t *scope_push(scope_t *new_scope)
814 if (current_scope != NULL) {
815 new_scope->depth = current_scope->depth + 1;
818 scope_t *old_scope = current_scope;
819 current_scope = new_scope;
824 * Pop the current scope from the scope stack.
826 static void scope_pop(scope_t *old_scope)
828 current_scope = old_scope;
832 * Search an entity by its symbol in a given namespace.
834 static entity_t *get_entity(const symbol_t *const symbol,
835 namespace_tag_t namespc)
837 entity_t *entity = symbol->entity;
838 for (; entity != NULL; entity = entity->base.symbol_next) {
839 if (entity->base.namespc == namespc)
847 * pushs an entity on the environment stack and links the corresponding symbol
850 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
852 symbol_t *symbol = entity->base.symbol;
853 entity_namespace_t namespc = entity->base.namespc;
854 assert(namespc != NAMESPACE_INVALID);
856 /* replace/add entity into entity list of the symbol */
859 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
864 /* replace an entry? */
865 if (iter->base.namespc == namespc) {
866 entity->base.symbol_next = iter->base.symbol_next;
872 /* remember old declaration */
874 entry.symbol = symbol;
875 entry.old_entity = iter;
876 entry.namespc = namespc;
877 ARR_APP1(stack_entry_t, *stack_ptr, entry);
881 * Push an entity on the environment stack.
883 static void environment_push(entity_t *entity)
885 assert(entity->base.source_position.input_name != NULL);
886 assert(entity->base.parent_scope != NULL);
887 stack_push(&environment_stack, entity);
891 * Push a declaration on the global label stack.
893 * @param declaration the declaration
895 static void label_push(entity_t *label)
897 /* we abuse the parameters scope as parent for the labels */
898 label->base.parent_scope = ¤t_function->parameters;
899 stack_push(&label_stack, label);
903 * pops symbols from the environment stack until @p new_top is the top element
905 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
907 stack_entry_t *stack = *stack_ptr;
908 size_t top = ARR_LEN(stack);
911 assert(new_top <= top);
915 for (i = top; i > new_top; --i) {
916 stack_entry_t *entry = &stack[i - 1];
918 entity_t *old_entity = entry->old_entity;
919 symbol_t *symbol = entry->symbol;
920 entity_namespace_t namespc = entry->namespc;
922 /* replace with old_entity/remove */
925 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
927 assert(iter != NULL);
928 /* replace an entry? */
929 if (iter->base.namespc == namespc)
933 /* restore definition from outer scopes (if there was one) */
934 if (old_entity != NULL) {
935 old_entity->base.symbol_next = iter->base.symbol_next;
936 *anchor = old_entity;
938 /* remove entry from list */
939 *anchor = iter->base.symbol_next;
943 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
947 * Pop all entries from the environment stack until the new_top
950 * @param new_top the new stack top
952 static void environment_pop_to(size_t new_top)
954 stack_pop_to(&environment_stack, new_top);
958 * Pop all entries from the global label stack until the new_top
961 * @param new_top the new stack top
963 static void label_pop_to(size_t new_top)
965 stack_pop_to(&label_stack, new_top);
968 static int get_akind_rank(atomic_type_kind_t akind)
974 * Return the type rank for an atomic type.
976 static int get_rank(const type_t *type)
978 assert(!is_typeref(type));
979 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
980 * and esp. footnote 108). However we can't fold constants (yet), so we
981 * can't decide whether unsigned int is possible, while int always works.
982 * (unsigned int would be preferable when possible... for stuff like
983 * struct { enum { ... } bla : 4; } ) */
984 if (type->kind == TYPE_ENUM)
985 return get_akind_rank(ATOMIC_TYPE_INT);
987 assert(type->kind == TYPE_ATOMIC);
988 return get_akind_rank(type->atomic.akind);
992 * Do integer promotion for a given type.
994 * @param type the type to promote
995 * @return the promoted type
997 static type_t *promote_integer(type_t *type)
999 if (type->kind == TYPE_BITFIELD)
1000 type = type->bitfield.base_type;
1002 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
1009 * Create a cast expression.
1011 * @param expression the expression to cast
1012 * @param dest_type the destination type
1014 static expression_t *create_cast_expression(expression_t *expression,
1017 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
1019 cast->unary.value = expression;
1020 cast->base.type = dest_type;
1026 * Check if a given expression represents a null pointer constant.
1028 * @param expression the expression to check
1030 static bool is_null_pointer_constant(const expression_t *expression)
1032 /* skip void* cast */
1033 if (expression->kind == EXPR_UNARY_CAST
1034 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
1035 expression = expression->unary.value;
1038 /* TODO: not correct yet, should be any constant integer expression
1039 * which evaluates to 0 */
1040 if (expression->kind != EXPR_CONST)
1043 type_t *const type = skip_typeref(expression->base.type);
1044 if (!is_type_integer(type))
1047 return expression->conste.v.int_value == 0;
1051 * Create an implicit cast expression.
1053 * @param expression the expression to cast
1054 * @param dest_type the destination type
1056 static expression_t *create_implicit_cast(expression_t *expression,
1059 type_t *const source_type = expression->base.type;
1061 if (source_type == dest_type)
1064 return create_cast_expression(expression, dest_type);
1067 typedef enum assign_error_t {
1069 ASSIGN_ERROR_INCOMPATIBLE,
1070 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1071 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1072 ASSIGN_WARNING_POINTER_FROM_INT,
1073 ASSIGN_WARNING_INT_FROM_POINTER
1076 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1077 const expression_t *const right,
1078 const char *context,
1079 const source_position_t *source_position)
1081 type_t *const orig_type_right = right->base.type;
1082 type_t *const type_left = skip_typeref(orig_type_left);
1083 type_t *const type_right = skip_typeref(orig_type_right);
1086 case ASSIGN_SUCCESS:
1088 case ASSIGN_ERROR_INCOMPATIBLE:
1089 errorf(source_position,
1090 "destination type '%T' in %s is incompatible with type '%T'",
1091 orig_type_left, context, orig_type_right);
1094 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1095 if (warning.other) {
1096 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
1097 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1099 /* the left type has all qualifiers from the right type */
1100 unsigned missing_qualifiers
1101 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1102 warningf(source_position,
1103 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1104 orig_type_left, context, orig_type_right, missing_qualifiers);
1109 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1110 if (warning.other) {
1111 warningf(source_position,
1112 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1113 orig_type_left, context, right, orig_type_right);
1117 case ASSIGN_WARNING_POINTER_FROM_INT:
1118 if (warning.other) {
1119 warningf(source_position,
1120 "%s makes pointer '%T' from integer '%T' without a cast",
1121 context, orig_type_left, orig_type_right);
1125 case ASSIGN_WARNING_INT_FROM_POINTER:
1126 if (warning.other) {
1127 warningf(source_position,
1128 "%s makes integer '%T' from pointer '%T' without a cast",
1129 context, orig_type_left, orig_type_right);
1134 panic("invalid error value");
1138 /** Implements the rules from § 6.5.16.1 */
1139 static assign_error_t semantic_assign(type_t *orig_type_left,
1140 const expression_t *const right)
1142 type_t *const orig_type_right = right->base.type;
1143 type_t *const type_left = skip_typeref(orig_type_left);
1144 type_t *const type_right = skip_typeref(orig_type_right);
1146 if (is_type_pointer(type_left)) {
1147 if (is_null_pointer_constant(right)) {
1148 return ASSIGN_SUCCESS;
1149 } else if (is_type_pointer(type_right)) {
1150 type_t *points_to_left
1151 = skip_typeref(type_left->pointer.points_to);
1152 type_t *points_to_right
1153 = skip_typeref(type_right->pointer.points_to);
1154 assign_error_t res = ASSIGN_SUCCESS;
1156 /* the left type has all qualifiers from the right type */
1157 unsigned missing_qualifiers
1158 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1159 if (missing_qualifiers != 0) {
1160 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1163 points_to_left = get_unqualified_type(points_to_left);
1164 points_to_right = get_unqualified_type(points_to_right);
1166 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1169 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1170 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1171 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1174 if (!types_compatible(points_to_left, points_to_right)) {
1175 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1179 } else if (is_type_integer(type_right)) {
1180 return ASSIGN_WARNING_POINTER_FROM_INT;
1182 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1183 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1184 && is_type_pointer(type_right))) {
1185 return ASSIGN_SUCCESS;
1186 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1187 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1188 type_t *const unqual_type_left = get_unqualified_type(type_left);
1189 type_t *const unqual_type_right = get_unqualified_type(type_right);
1190 if (types_compatible(unqual_type_left, unqual_type_right)) {
1191 return ASSIGN_SUCCESS;
1193 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1194 return ASSIGN_WARNING_INT_FROM_POINTER;
1197 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1198 return ASSIGN_SUCCESS;
1200 return ASSIGN_ERROR_INCOMPATIBLE;
1203 static expression_t *parse_constant_expression(void)
1205 expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1207 if (!is_constant_expression(result)) {
1208 errorf(&result->base.source_position,
1209 "expression '%E' is not constant", result);
1215 static expression_t *parse_assignment_expression(void)
1217 return parse_sub_expression(PREC_ASSIGNMENT);
1220 static string_t parse_string_literals(void)
1222 assert(token.type == T_STRING_LITERAL);
1223 string_t result = token.v.string;
1227 while (token.type == T_STRING_LITERAL) {
1228 result = concat_strings(&result, &token.v.string);
1235 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1236 [GNU_AK_CONST] = "const",
1237 [GNU_AK_VOLATILE] = "volatile",
1238 [GNU_AK_CDECL] = "cdecl",
1239 [GNU_AK_STDCALL] = "stdcall",
1240 [GNU_AK_FASTCALL] = "fastcall",
1241 [GNU_AK_DEPRECATED] = "deprecated",
1242 [GNU_AK_NOINLINE] = "noinline",
1243 [GNU_AK_NORETURN] = "noreturn",
1244 [GNU_AK_NAKED] = "naked",
1245 [GNU_AK_PURE] = "pure",
1246 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1247 [GNU_AK_MALLOC] = "malloc",
1248 [GNU_AK_WEAK] = "weak",
1249 [GNU_AK_CONSTRUCTOR] = "constructor",
1250 [GNU_AK_DESTRUCTOR] = "destructor",
1251 [GNU_AK_NOTHROW] = "nothrow",
1252 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1253 [GNU_AK_COMMON] = "common",
1254 [GNU_AK_NOCOMMON] = "nocommon",
1255 [GNU_AK_PACKED] = "packed",
1256 [GNU_AK_SHARED] = "shared",
1257 [GNU_AK_NOTSHARED] = "notshared",
1258 [GNU_AK_USED] = "used",
1259 [GNU_AK_UNUSED] = "unused",
1260 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1261 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1262 [GNU_AK_LONGCALL] = "longcall",
1263 [GNU_AK_SHORTCALL] = "shortcall",
1264 [GNU_AK_LONG_CALL] = "long_call",
1265 [GNU_AK_SHORT_CALL] = "short_call",
1266 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1267 [GNU_AK_INTERRUPT] = "interrupt",
1268 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1269 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1270 [GNU_AK_NESTING] = "nesting",
1271 [GNU_AK_NEAR] = "near",
1272 [GNU_AK_FAR] = "far",
1273 [GNU_AK_SIGNAL] = "signal",
1274 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1275 [GNU_AK_TINY_DATA] = "tiny_data",
1276 [GNU_AK_SAVEALL] = "saveall",
1277 [GNU_AK_FLATTEN] = "flatten",
1278 [GNU_AK_SSEREGPARM] = "sseregparm",
1279 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1280 [GNU_AK_RETURN_TWICE] = "return_twice",
1281 [GNU_AK_MAY_ALIAS] = "may_alias",
1282 [GNU_AK_MS_STRUCT] = "ms_struct",
1283 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1284 [GNU_AK_DLLIMPORT] = "dllimport",
1285 [GNU_AK_DLLEXPORT] = "dllexport",
1286 [GNU_AK_ALIGNED] = "aligned",
1287 [GNU_AK_ALIAS] = "alias",
1288 [GNU_AK_SECTION] = "section",
1289 [GNU_AK_FORMAT] = "format",
1290 [GNU_AK_FORMAT_ARG] = "format_arg",
1291 [GNU_AK_WEAKREF] = "weakref",
1292 [GNU_AK_NONNULL] = "nonnull",
1293 [GNU_AK_TLS_MODEL] = "tls_model",
1294 [GNU_AK_VISIBILITY] = "visibility",
1295 [GNU_AK_REGPARM] = "regparm",
1296 [GNU_AK_MODE] = "mode",
1297 [GNU_AK_MODEL] = "model",
1298 [GNU_AK_TRAP_EXIT] = "trap_exit",
1299 [GNU_AK_SP_SWITCH] = "sp_switch",
1300 [GNU_AK_SENTINEL] = "sentinel"
1304 * compare two string, ignoring double underscores on the second.
1306 static int strcmp_underscore(const char *s1, const char *s2)
1308 if (s2[0] == '_' && s2[1] == '_') {
1309 size_t len2 = strlen(s2);
1310 size_t len1 = strlen(s1);
1311 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1312 return strncmp(s1, s2+2, len2-4);
1316 return strcmp(s1, s2);
1320 * Allocate a new gnu temporal attribute of given kind.
1322 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1324 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1325 attribute->kind = kind;
1326 attribute->next = NULL;
1327 attribute->invalid = false;
1328 attribute->have_arguments = false;
1334 * Parse one constant expression argument of the given attribute.
1336 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1338 expression_t *expression;
1339 add_anchor_token(')');
1340 expression = parse_constant_expression();
1341 rem_anchor_token(')');
1343 attribute->u.argument = fold_constant(expression);
1346 attribute->invalid = true;
1350 * Parse a list of constant expressions arguments of the given attribute.
1352 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1354 argument_list_t **list = &attribute->u.arguments;
1355 argument_list_t *entry;
1356 expression_t *expression;
1357 add_anchor_token(')');
1358 add_anchor_token(',');
1360 expression = parse_constant_expression();
1361 entry = obstack_alloc(&temp_obst, sizeof(entry));
1362 entry->argument = fold_constant(expression);
1365 list = &entry->next;
1366 if (token.type != ',')
1370 rem_anchor_token(',');
1371 rem_anchor_token(')');
1375 attribute->invalid = true;
1379 * Parse one string literal argument of the given attribute.
1381 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1384 add_anchor_token('(');
1385 if (token.type != T_STRING_LITERAL) {
1386 parse_error_expected("while parsing attribute directive",
1387 T_STRING_LITERAL, NULL);
1390 *string = parse_string_literals();
1391 rem_anchor_token('(');
1395 attribute->invalid = true;
1399 * Parse one tls model of the given attribute.
1401 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1403 static const char *const tls_models[] = {
1409 string_t string = { NULL, 0 };
1410 parse_gnu_attribute_string_arg(attribute, &string);
1411 if (string.begin != NULL) {
1412 for (size_t i = 0; i < 4; ++i) {
1413 if (strcmp(tls_models[i], string.begin) == 0) {
1414 attribute->u.value = i;
1418 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1420 attribute->invalid = true;
1424 * Parse one tls model of the given attribute.
1426 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1428 static const char *const visibilities[] = {
1434 string_t string = { NULL, 0 };
1435 parse_gnu_attribute_string_arg(attribute, &string);
1436 if (string.begin != NULL) {
1437 for (size_t i = 0; i < 4; ++i) {
1438 if (strcmp(visibilities[i], string.begin) == 0) {
1439 attribute->u.value = i;
1443 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1445 attribute->invalid = true;
1449 * Parse one (code) model of the given attribute.
1451 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1453 static const char *const visibilities[] = {
1458 string_t string = { NULL, 0 };
1459 parse_gnu_attribute_string_arg(attribute, &string);
1460 if (string.begin != NULL) {
1461 for (int i = 0; i < 3; ++i) {
1462 if (strcmp(visibilities[i], string.begin) == 0) {
1463 attribute->u.value = i;
1467 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1469 attribute->invalid = true;
1473 * Parse one mode of the given attribute.
1475 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1477 /* TODO: find out what is allowed here... */
1479 /* at least: byte, word, pointer, list of machine modes
1480 * __XXX___ is interpreted as XXX */
1481 add_anchor_token(')');
1483 if (token.type != T_IDENTIFIER) {
1484 expect(T_IDENTIFIER);
1487 /* This isn't really correct, the backend should provide a list of machine
1488 * specific modes (according to gcc philosophy that is...) */
1489 const char *symbol_str = token.v.symbol->string;
1490 if (strcmp_underscore("QI", symbol_str) == 0 ||
1491 strcmp_underscore("byte", symbol_str) == 0) {
1492 attribute->u.akind = ATOMIC_TYPE_CHAR;
1493 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1494 attribute->u.akind = ATOMIC_TYPE_SHORT;
1495 } else if (strcmp_underscore("SI", symbol_str) == 0
1496 || strcmp_underscore("word", symbol_str) == 0
1497 || strcmp_underscore("pointer", symbol_str) == 0) {
1498 attribute->u.akind = ATOMIC_TYPE_INT;
1499 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1500 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1503 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1504 attribute->invalid = true;
1508 rem_anchor_token(')');
1512 attribute->invalid = true;
1516 * Parse one interrupt argument of the given attribute.
1518 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1520 static const char *const interrupts[] = {
1527 string_t string = { NULL, 0 };
1528 parse_gnu_attribute_string_arg(attribute, &string);
1529 if (string.begin != NULL) {
1530 for (size_t i = 0; i < 5; ++i) {
1531 if (strcmp(interrupts[i], string.begin) == 0) {
1532 attribute->u.value = i;
1536 errorf(HERE, "'%s' is not an interrupt", string.begin);
1538 attribute->invalid = true;
1542 * Parse ( identifier, const expression, const expression )
1544 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1546 static const char *const format_names[] = {
1554 if (token.type != T_IDENTIFIER) {
1555 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1558 const char *name = token.v.symbol->string;
1559 for (i = 0; i < 4; ++i) {
1560 if (strcmp_underscore(format_names[i], name) == 0)
1564 if (warning.attribute)
1565 warningf(HERE, "'%s' is an unrecognized format function type", name);
1570 add_anchor_token(')');
1571 add_anchor_token(',');
1572 parse_constant_expression();
1573 rem_anchor_token(',');
1574 rem_anchor_token(')');
1577 add_anchor_token(')');
1578 parse_constant_expression();
1579 rem_anchor_token(')');
1583 attribute->u.value = true;
1587 * Check that a given GNU attribute has no arguments.
1589 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1591 if (!attribute->have_arguments)
1594 /* should have no arguments */
1595 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1596 eat_until_matching_token('(');
1597 /* we have already consumed '(', so we stop before ')', eat it */
1599 attribute->invalid = true;
1603 * Parse one GNU attribute.
1605 * Note that attribute names can be specified WITH or WITHOUT
1606 * double underscores, ie const or __const__.
1608 * The following attributes are parsed without arguments
1633 * no_instrument_function
1634 * warn_unused_result
1651 * externally_visible
1659 * The following attributes are parsed with arguments
1660 * aligned( const expression )
1661 * alias( string literal )
1662 * section( string literal )
1663 * format( identifier, const expression, const expression )
1664 * format_arg( const expression )
1665 * tls_model( string literal )
1666 * visibility( string literal )
1667 * regparm( const expression )
1668 * model( string leteral )
1669 * trap_exit( const expression )
1670 * sp_switch( string literal )
1672 * The following attributes might have arguments
1673 * weak_ref( string literal )
1674 * non_null( const expression // ',' )
1675 * interrupt( string literal )
1676 * sentinel( constant expression )
1678 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1680 gnu_attribute_t *head = *attributes;
1681 gnu_attribute_t *last = *attributes;
1682 decl_modifiers_t modifiers = 0;
1683 gnu_attribute_t *attribute;
1685 eat(T___attribute__);
1689 if (token.type != ')') {
1690 /* find the end of the list */
1692 while (last->next != NULL)
1696 /* non-empty attribute list */
1699 if (token.type == T_const) {
1701 } else if (token.type == T_volatile) {
1703 } else if (token.type == T_cdecl) {
1704 /* __attribute__((cdecl)), WITH ms mode */
1706 } else if (token.type == T_IDENTIFIER) {
1707 const symbol_t *sym = token.v.symbol;
1710 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1717 for (i = 0; i < GNU_AK_LAST; ++i) {
1718 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1721 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1724 if (kind == GNU_AK_LAST) {
1725 if (warning.attribute)
1726 warningf(HERE, "'%s' attribute directive ignored", name);
1728 /* skip possible arguments */
1729 if (token.type == '(') {
1730 eat_until_matching_token(')');
1733 /* check for arguments */
1734 attribute = allocate_gnu_attribute(kind);
1735 if (token.type == '(') {
1737 if (token.type == ')') {
1738 /* empty args are allowed */
1741 attribute->have_arguments = true;
1745 case GNU_AK_VOLATILE:
1750 case GNU_AK_NOCOMMON:
1752 case GNU_AK_NOTSHARED:
1753 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1754 case GNU_AK_WARN_UNUSED_RESULT:
1755 case GNU_AK_LONGCALL:
1756 case GNU_AK_SHORTCALL:
1757 case GNU_AK_LONG_CALL:
1758 case GNU_AK_SHORT_CALL:
1759 case GNU_AK_FUNCTION_VECTOR:
1760 case GNU_AK_INTERRUPT_HANDLER:
1761 case GNU_AK_NMI_HANDLER:
1762 case GNU_AK_NESTING:
1766 case GNU_AK_EIGTHBIT_DATA:
1767 case GNU_AK_TINY_DATA:
1768 case GNU_AK_SAVEALL:
1769 case GNU_AK_FLATTEN:
1770 case GNU_AK_SSEREGPARM:
1771 case GNU_AK_EXTERNALLY_VISIBLE:
1772 case GNU_AK_RETURN_TWICE:
1773 case GNU_AK_MAY_ALIAS:
1774 case GNU_AK_MS_STRUCT:
1775 case GNU_AK_GCC_STRUCT:
1778 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1779 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1780 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1781 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1782 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1783 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1784 case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg;
1785 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1786 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1787 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1788 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1789 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1790 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1791 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1792 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1793 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1794 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1795 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1797 case GNU_AK_ALIGNED:
1798 /* __align__ may be used without an argument */
1799 if (attribute->have_arguments) {
1800 parse_gnu_attribute_const_arg(attribute);
1804 case GNU_AK_FORMAT_ARG:
1805 case GNU_AK_REGPARM:
1806 case GNU_AK_TRAP_EXIT:
1807 if (!attribute->have_arguments) {
1808 /* should have arguments */
1809 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1810 attribute->invalid = true;
1812 parse_gnu_attribute_const_arg(attribute);
1815 case GNU_AK_SECTION:
1816 case GNU_AK_SP_SWITCH:
1817 if (!attribute->have_arguments) {
1818 /* should have arguments */
1819 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1820 attribute->invalid = true;
1822 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1825 if (!attribute->have_arguments) {
1826 /* should have arguments */
1827 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1828 attribute->invalid = true;
1830 parse_gnu_attribute_format_args(attribute);
1832 case GNU_AK_WEAKREF:
1833 /* may have one string argument */
1834 if (attribute->have_arguments)
1835 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1837 case GNU_AK_NONNULL:
1838 if (attribute->have_arguments)
1839 parse_gnu_attribute_const_arg_list(attribute);
1841 case GNU_AK_TLS_MODEL:
1842 if (!attribute->have_arguments) {
1843 /* should have arguments */
1844 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1846 parse_gnu_attribute_tls_model_arg(attribute);
1848 case GNU_AK_VISIBILITY:
1849 if (!attribute->have_arguments) {
1850 /* should have arguments */
1851 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1853 parse_gnu_attribute_visibility_arg(attribute);
1856 if (!attribute->have_arguments) {
1857 /* should have arguments */
1858 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1860 parse_gnu_attribute_model_arg(attribute);
1864 if (!attribute->have_arguments) {
1865 /* should have arguments */
1866 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1868 parse_gnu_attribute_mode_arg(attribute);
1871 case GNU_AK_INTERRUPT:
1872 /* may have one string argument */
1873 if (attribute->have_arguments)
1874 parse_gnu_attribute_interrupt_arg(attribute);
1876 case GNU_AK_SENTINEL:
1877 /* may have one string argument */
1878 if (attribute->have_arguments)
1879 parse_gnu_attribute_const_arg(attribute);
1882 /* already handled */
1886 check_no_argument(attribute, name);
1889 if (attribute != NULL) {
1891 last->next = attribute;
1894 head = last = attribute;
1898 if (token.type != ',')
1912 * Parse GNU attributes.
1914 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1916 decl_modifiers_t modifiers = 0;
1919 switch (token.type) {
1920 case T___attribute__:
1921 modifiers |= parse_gnu_attribute(attributes);
1927 if (token.type != T_STRING_LITERAL) {
1928 parse_error_expected("while parsing assembler attribute",
1929 T_STRING_LITERAL, NULL);
1930 eat_until_matching_token('(');
1933 parse_string_literals();
1938 case T_cdecl: modifiers |= DM_CDECL; break;
1939 case T__fastcall: modifiers |= DM_FASTCALL; break;
1940 case T__stdcall: modifiers |= DM_STDCALL; break;
1943 /* TODO record modifier */
1945 warningf(HERE, "Ignoring declaration modifier %K", &token);
1949 default: return modifiers;
1956 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1958 static entity_t *determine_lhs_ent(expression_t *const expr,
1961 switch (expr->kind) {
1962 case EXPR_REFERENCE: {
1963 entity_t *const entity = expr->reference.entity;
1964 /* we should only find variables as lvalues... */
1965 if (entity->base.kind != ENTITY_VARIABLE
1966 && entity->base.kind != ENTITY_PARAMETER)
1972 case EXPR_ARRAY_ACCESS: {
1973 expression_t *const ref = expr->array_access.array_ref;
1974 entity_t * ent = NULL;
1975 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1976 ent = determine_lhs_ent(ref, lhs_ent);
1979 mark_vars_read(expr->select.compound, lhs_ent);
1981 mark_vars_read(expr->array_access.index, lhs_ent);
1986 if (is_type_compound(skip_typeref(expr->base.type))) {
1987 return determine_lhs_ent(expr->select.compound, lhs_ent);
1989 mark_vars_read(expr->select.compound, lhs_ent);
1994 case EXPR_UNARY_DEREFERENCE: {
1995 expression_t *const val = expr->unary.value;
1996 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1998 return determine_lhs_ent(val->unary.value, lhs_ent);
2000 mark_vars_read(val, NULL);
2006 mark_vars_read(expr, NULL);
2011 #define ENT_ANY ((entity_t*)-1)
2014 * Mark declarations, which are read. This is used to detect variables, which
2018 * x is not marked as "read", because it is only read to calculate its own new
2022 * x and y are not detected as "not read", because multiple variables are
2025 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
2027 switch (expr->kind) {
2028 case EXPR_REFERENCE: {
2029 entity_t *const entity = expr->reference.entity;
2030 if (entity->kind != ENTITY_VARIABLE
2031 && entity->kind != ENTITY_PARAMETER)
2034 if (lhs_ent != entity && lhs_ent != ENT_ANY) {
2035 if (entity->kind == ENTITY_VARIABLE) {
2036 entity->variable.read = true;
2038 entity->parameter.read = true;
2045 // TODO respect pure/const
2046 mark_vars_read(expr->call.function, NULL);
2047 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
2048 mark_vars_read(arg->expression, NULL);
2052 case EXPR_CONDITIONAL:
2053 // TODO lhs_decl should depend on whether true/false have an effect
2054 mark_vars_read(expr->conditional.condition, NULL);
2055 if (expr->conditional.true_expression != NULL)
2056 mark_vars_read(expr->conditional.true_expression, lhs_ent);
2057 mark_vars_read(expr->conditional.false_expression, lhs_ent);
2061 if (lhs_ent == ENT_ANY
2062 && !is_type_compound(skip_typeref(expr->base.type)))
2064 mark_vars_read(expr->select.compound, lhs_ent);
2067 case EXPR_ARRAY_ACCESS: {
2068 expression_t *const ref = expr->array_access.array_ref;
2069 mark_vars_read(ref, lhs_ent);
2070 lhs_ent = determine_lhs_ent(ref, lhs_ent);
2071 mark_vars_read(expr->array_access.index, lhs_ent);
2076 mark_vars_read(expr->va_arge.ap, lhs_ent);
2079 case EXPR_UNARY_CAST:
2080 /* Special case: Use void cast to mark a variable as "read" */
2081 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
2086 case EXPR_UNARY_THROW:
2087 if (expr->unary.value == NULL)
2090 case EXPR_UNARY_DEREFERENCE:
2091 case EXPR_UNARY_DELETE:
2092 case EXPR_UNARY_DELETE_ARRAY:
2093 if (lhs_ent == ENT_ANY)
2097 case EXPR_UNARY_NEGATE:
2098 case EXPR_UNARY_PLUS:
2099 case EXPR_UNARY_BITWISE_NEGATE:
2100 case EXPR_UNARY_NOT:
2101 case EXPR_UNARY_TAKE_ADDRESS:
2102 case EXPR_UNARY_POSTFIX_INCREMENT:
2103 case EXPR_UNARY_POSTFIX_DECREMENT:
2104 case EXPR_UNARY_PREFIX_INCREMENT:
2105 case EXPR_UNARY_PREFIX_DECREMENT:
2106 case EXPR_UNARY_CAST_IMPLICIT:
2107 case EXPR_UNARY_ASSUME:
2109 mark_vars_read(expr->unary.value, lhs_ent);
2112 case EXPR_BINARY_ADD:
2113 case EXPR_BINARY_SUB:
2114 case EXPR_BINARY_MUL:
2115 case EXPR_BINARY_DIV:
2116 case EXPR_BINARY_MOD:
2117 case EXPR_BINARY_EQUAL:
2118 case EXPR_BINARY_NOTEQUAL:
2119 case EXPR_BINARY_LESS:
2120 case EXPR_BINARY_LESSEQUAL:
2121 case EXPR_BINARY_GREATER:
2122 case EXPR_BINARY_GREATEREQUAL:
2123 case EXPR_BINARY_BITWISE_AND:
2124 case EXPR_BINARY_BITWISE_OR:
2125 case EXPR_BINARY_BITWISE_XOR:
2126 case EXPR_BINARY_LOGICAL_AND:
2127 case EXPR_BINARY_LOGICAL_OR:
2128 case EXPR_BINARY_SHIFTLEFT:
2129 case EXPR_BINARY_SHIFTRIGHT:
2130 case EXPR_BINARY_COMMA:
2131 case EXPR_BINARY_ISGREATER:
2132 case EXPR_BINARY_ISGREATEREQUAL:
2133 case EXPR_BINARY_ISLESS:
2134 case EXPR_BINARY_ISLESSEQUAL:
2135 case EXPR_BINARY_ISLESSGREATER:
2136 case EXPR_BINARY_ISUNORDERED:
2137 mark_vars_read(expr->binary.left, lhs_ent);
2138 mark_vars_read(expr->binary.right, lhs_ent);
2141 case EXPR_BINARY_ASSIGN:
2142 case EXPR_BINARY_MUL_ASSIGN:
2143 case EXPR_BINARY_DIV_ASSIGN:
2144 case EXPR_BINARY_MOD_ASSIGN:
2145 case EXPR_BINARY_ADD_ASSIGN:
2146 case EXPR_BINARY_SUB_ASSIGN:
2147 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2148 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2149 case EXPR_BINARY_BITWISE_AND_ASSIGN:
2150 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2151 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
2152 if (lhs_ent == ENT_ANY)
2154 lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
2155 mark_vars_read(expr->binary.right, lhs_ent);
2160 determine_lhs_ent(expr->va_starte.ap, lhs_ent);
2166 case EXPR_CHARACTER_CONSTANT:
2167 case EXPR_WIDE_CHARACTER_CONSTANT:
2168 case EXPR_STRING_LITERAL:
2169 case EXPR_WIDE_STRING_LITERAL:
2170 case EXPR_COMPOUND_LITERAL: // TODO init?
2172 case EXPR_CLASSIFY_TYPE:
2175 case EXPR_BUILTIN_SYMBOL:
2176 case EXPR_BUILTIN_CONSTANT_P:
2177 case EXPR_BUILTIN_PREFETCH:
2179 case EXPR_STATEMENT: // TODO
2180 case EXPR_LABEL_ADDRESS:
2181 case EXPR_REFERENCE_ENUM_VALUE:
2185 panic("unhandled expression");
2188 static designator_t *parse_designation(void)
2190 designator_t *result = NULL;
2191 designator_t *last = NULL;
2194 designator_t *designator;
2195 switch (token.type) {
2197 designator = allocate_ast_zero(sizeof(designator[0]));
2198 designator->source_position = token.source_position;
2200 add_anchor_token(']');
2201 designator->array_index = parse_constant_expression();
2202 rem_anchor_token(']');
2206 designator = allocate_ast_zero(sizeof(designator[0]));
2207 designator->source_position = token.source_position;
2209 if (token.type != T_IDENTIFIER) {
2210 parse_error_expected("while parsing designator",
2211 T_IDENTIFIER, NULL);
2214 designator->symbol = token.v.symbol;
2222 assert(designator != NULL);
2224 last->next = designator;
2226 result = designator;
2234 static initializer_t *initializer_from_string(array_type_t *type,
2235 const string_t *const string)
2237 /* TODO: check len vs. size of array type */
2240 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
2241 initializer->string.string = *string;
2246 static initializer_t *initializer_from_wide_string(array_type_t *const type,
2247 wide_string_t *const string)
2249 /* TODO: check len vs. size of array type */
2252 initializer_t *const initializer =
2253 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
2254 initializer->wide_string.string = *string;
2260 * Build an initializer from a given expression.
2262 static initializer_t *initializer_from_expression(type_t *orig_type,
2263 expression_t *expression)
2265 /* TODO check that expression is a constant expression */
2267 /* § 6.7.8.14/15 char array may be initialized by string literals */
2268 type_t *type = skip_typeref(orig_type);
2269 type_t *expr_type_orig = expression->base.type;
2270 type_t *expr_type = skip_typeref(expr_type_orig);
2271 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
2272 array_type_t *const array_type = &type->array;
2273 type_t *const element_type = skip_typeref(array_type->element_type);
2275 if (element_type->kind == TYPE_ATOMIC) {
2276 atomic_type_kind_t akind = element_type->atomic.akind;
2277 switch (expression->kind) {
2278 case EXPR_STRING_LITERAL:
2279 if (akind == ATOMIC_TYPE_CHAR
2280 || akind == ATOMIC_TYPE_SCHAR
2281 || akind == ATOMIC_TYPE_UCHAR) {
2282 return initializer_from_string(array_type,
2283 &expression->string.value);
2286 case EXPR_WIDE_STRING_LITERAL: {
2287 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
2288 if (get_unqualified_type(element_type) == bare_wchar_type) {
2289 return initializer_from_wide_string(array_type,
2290 &expression->wide_string.value);
2300 assign_error_t error = semantic_assign(type, expression);
2301 if (error == ASSIGN_ERROR_INCOMPATIBLE)
2303 report_assign_error(error, type, expression, "initializer",
2304 &expression->base.source_position);
2306 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2308 if (type->kind == TYPE_BITFIELD) {
2309 type = type->bitfield.base_type;
2312 result->value.value = create_implicit_cast(expression, type);
2318 * Checks if a given expression can be used as an constant initializer.
2320 static bool is_initializer_constant(const expression_t *expression)
2322 return is_constant_expression(expression)
2323 || is_address_constant(expression);
2327 * Parses an scalar initializer.
2329 * § 6.7.8.11; eat {} without warning
2331 static initializer_t *parse_scalar_initializer(type_t *type,
2332 bool must_be_constant)
2334 /* there might be extra {} hierarchies */
2336 if (token.type == '{') {
2338 warningf(HERE, "extra curly braces around scalar initializer");
2342 } while (token.type == '{');
2345 expression_t *expression = parse_assignment_expression();
2346 mark_vars_read(expression, NULL);
2347 if (must_be_constant && !is_initializer_constant(expression)) {
2348 errorf(&expression->base.source_position,
2349 "Initialisation expression '%E' is not constant",
2353 initializer_t *initializer = initializer_from_expression(type, expression);
2355 if (initializer == NULL) {
2356 errorf(&expression->base.source_position,
2357 "expression '%E' (type '%T') doesn't match expected type '%T'",
2358 expression, expression->base.type, type);
2363 bool additional_warning_displayed = false;
2364 while (braces > 0) {
2365 if (token.type == ',') {
2368 if (token.type != '}') {
2369 if (!additional_warning_displayed && warning.other) {
2370 warningf(HERE, "additional elements in scalar initializer");
2371 additional_warning_displayed = true;
2382 * An entry in the type path.
2384 typedef struct type_path_entry_t type_path_entry_t;
2385 struct type_path_entry_t {
2386 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2388 size_t index; /**< For array types: the current index. */
2389 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2394 * A type path expression a position inside compound or array types.
2396 typedef struct type_path_t type_path_t;
2397 struct type_path_t {
2398 type_path_entry_t *path; /**< An flexible array containing the current path. */
2399 type_t *top_type; /**< type of the element the path points */
2400 size_t max_index; /**< largest index in outermost array */
2404 * Prints a type path for debugging.
2406 static __attribute__((unused)) void debug_print_type_path(
2407 const type_path_t *path)
2409 size_t len = ARR_LEN(path->path);
2411 for (size_t i = 0; i < len; ++i) {
2412 const type_path_entry_t *entry = & path->path[i];
2414 type_t *type = skip_typeref(entry->type);
2415 if (is_type_compound(type)) {
2416 /* in gcc mode structs can have no members */
2417 if (entry->v.compound_entry == NULL) {
2421 fprintf(stderr, ".%s",
2422 entry->v.compound_entry->base.symbol->string);
2423 } else if (is_type_array(type)) {
2424 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
2426 fprintf(stderr, "-INVALID-");
2429 if (path->top_type != NULL) {
2430 fprintf(stderr, " (");
2431 print_type(path->top_type);
2432 fprintf(stderr, ")");
2437 * Return the top type path entry, ie. in a path
2438 * (type).a.b returns the b.
2440 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2442 size_t len = ARR_LEN(path->path);
2444 return &path->path[len-1];
2448 * Enlarge the type path by an (empty) element.
2450 static type_path_entry_t *append_to_type_path(type_path_t *path)
2452 size_t len = ARR_LEN(path->path);
2453 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2455 type_path_entry_t *result = & path->path[len];
2456 memset(result, 0, sizeof(result[0]));
2461 * Descending into a sub-type. Enter the scope of the current top_type.
2463 static void descend_into_subtype(type_path_t *path)
2465 type_t *orig_top_type = path->top_type;
2466 type_t *top_type = skip_typeref(orig_top_type);
2468 type_path_entry_t *top = append_to_type_path(path);
2469 top->type = top_type;
2471 if (is_type_compound(top_type)) {
2472 compound_t *compound = top_type->compound.compound;
2473 entity_t *entry = compound->members.entities;
2475 if (entry != NULL) {
2476 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2477 top->v.compound_entry = &entry->declaration;
2478 path->top_type = entry->declaration.type;
2480 path->top_type = NULL;
2482 } else if (is_type_array(top_type)) {
2484 path->top_type = top_type->array.element_type;
2486 assert(!is_type_valid(top_type));
2491 * Pop an entry from the given type path, ie. returning from
2492 * (type).a.b to (type).a
2494 static void ascend_from_subtype(type_path_t *path)
2496 type_path_entry_t *top = get_type_path_top(path);
2498 path->top_type = top->type;
2500 size_t len = ARR_LEN(path->path);
2501 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2505 * Pop entries from the given type path until the given
2506 * path level is reached.
2508 static void ascend_to(type_path_t *path, size_t top_path_level)
2510 size_t len = ARR_LEN(path->path);
2512 while (len > top_path_level) {
2513 ascend_from_subtype(path);
2514 len = ARR_LEN(path->path);
2518 static bool walk_designator(type_path_t *path, const designator_t *designator,
2519 bool used_in_offsetof)
2521 for (; designator != NULL; designator = designator->next) {
2522 type_path_entry_t *top = get_type_path_top(path);
2523 type_t *orig_type = top->type;
2525 type_t *type = skip_typeref(orig_type);
2527 if (designator->symbol != NULL) {
2528 symbol_t *symbol = designator->symbol;
2529 if (!is_type_compound(type)) {
2530 if (is_type_valid(type)) {
2531 errorf(&designator->source_position,
2532 "'.%Y' designator used for non-compound type '%T'",
2536 top->type = type_error_type;
2537 top->v.compound_entry = NULL;
2538 orig_type = type_error_type;
2540 compound_t *compound = type->compound.compound;
2541 entity_t *iter = compound->members.entities;
2542 for (; iter != NULL; iter = iter->base.next) {
2543 if (iter->base.symbol == symbol) {
2548 errorf(&designator->source_position,
2549 "'%T' has no member named '%Y'", orig_type, symbol);
2552 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2553 if (used_in_offsetof) {
2554 type_t *real_type = skip_typeref(iter->declaration.type);
2555 if (real_type->kind == TYPE_BITFIELD) {
2556 errorf(&designator->source_position,
2557 "offsetof designator '%Y' may not specify bitfield",
2563 top->type = orig_type;
2564 top->v.compound_entry = &iter->declaration;
2565 orig_type = iter->declaration.type;
2568 expression_t *array_index = designator->array_index;
2569 assert(designator->array_index != NULL);
2571 if (!is_type_array(type)) {
2572 if (is_type_valid(type)) {
2573 errorf(&designator->source_position,
2574 "[%E] designator used for non-array type '%T'",
2575 array_index, orig_type);
2580 long index = fold_constant(array_index);
2581 if (!used_in_offsetof) {
2583 errorf(&designator->source_position,
2584 "array index [%E] must be positive", array_index);
2585 } else if (type->array.size_constant) {
2586 long array_size = type->array.size;
2587 if (index >= array_size) {
2588 errorf(&designator->source_position,
2589 "designator [%E] (%d) exceeds array size %d",
2590 array_index, index, array_size);
2595 top->type = orig_type;
2596 top->v.index = (size_t) index;
2597 orig_type = type->array.element_type;
2599 path->top_type = orig_type;
2601 if (designator->next != NULL) {
2602 descend_into_subtype(path);
2611 static void advance_current_object(type_path_t *path, size_t top_path_level)
2613 type_path_entry_t *top = get_type_path_top(path);
2615 type_t *type = skip_typeref(top->type);
2616 if (is_type_union(type)) {
2617 /* in unions only the first element is initialized */
2618 top->v.compound_entry = NULL;
2619 } else if (is_type_struct(type)) {
2620 declaration_t *entry = top->v.compound_entry;
2622 entity_t *next_entity = entry->base.next;
2623 if (next_entity != NULL) {
2624 assert(is_declaration(next_entity));
2625 entry = &next_entity->declaration;
2630 top->v.compound_entry = entry;
2631 if (entry != NULL) {
2632 path->top_type = entry->type;
2635 } else if (is_type_array(type)) {
2636 assert(is_type_array(type));
2640 if (!type->array.size_constant || top->v.index < type->array.size) {
2644 assert(!is_type_valid(type));
2648 /* we're past the last member of the current sub-aggregate, try if we
2649 * can ascend in the type hierarchy and continue with another subobject */
2650 size_t len = ARR_LEN(path->path);
2652 if (len > top_path_level) {
2653 ascend_from_subtype(path);
2654 advance_current_object(path, top_path_level);
2656 path->top_type = NULL;
2661 * skip until token is found.
2663 static void skip_until(int type)
2665 while (token.type != type) {
2666 if (token.type == T_EOF)
2673 * skip any {...} blocks until a closing bracket is reached.
2675 static void skip_initializers(void)
2677 if (token.type == '{')
2680 while (token.type != '}') {
2681 if (token.type == T_EOF)
2683 if (token.type == '{') {
2691 static initializer_t *create_empty_initializer(void)
2693 static initializer_t empty_initializer
2694 = { .list = { { INITIALIZER_LIST }, 0 } };
2695 return &empty_initializer;
2699 * Parse a part of an initialiser for a struct or union,
2701 static initializer_t *parse_sub_initializer(type_path_t *path,
2702 type_t *outer_type, size_t top_path_level,
2703 parse_initializer_env_t *env)
2705 if (token.type == '}') {
2706 /* empty initializer */
2707 return create_empty_initializer();
2710 type_t *orig_type = path->top_type;
2711 type_t *type = NULL;
2713 if (orig_type == NULL) {
2714 /* We are initializing an empty compound. */
2716 type = skip_typeref(orig_type);
2719 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2722 designator_t *designator = NULL;
2723 if (token.type == '.' || token.type == '[') {
2724 designator = parse_designation();
2725 goto finish_designator;
2726 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2727 /* GNU-style designator ("identifier: value") */
2728 designator = allocate_ast_zero(sizeof(designator[0]));
2729 designator->source_position = token.source_position;
2730 designator->symbol = token.v.symbol;
2735 /* reset path to toplevel, evaluate designator from there */
2736 ascend_to(path, top_path_level);
2737 if (!walk_designator(path, designator, false)) {
2738 /* can't continue after designation error */
2742 initializer_t *designator_initializer
2743 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2744 designator_initializer->designator.designator = designator;
2745 ARR_APP1(initializer_t*, initializers, designator_initializer);
2747 orig_type = path->top_type;
2748 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2753 if (token.type == '{') {
2754 if (type != NULL && is_type_scalar(type)) {
2755 sub = parse_scalar_initializer(type, env->must_be_constant);
2759 if (env->entity != NULL) {
2761 "extra brace group at end of initializer for '%Y'",
2762 env->entity->base.symbol);
2764 errorf(HERE, "extra brace group at end of initializer");
2767 descend_into_subtype(path);
2769 add_anchor_token('}');
2770 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2772 rem_anchor_token('}');
2775 ascend_from_subtype(path);
2779 goto error_parse_next;
2783 /* must be an expression */
2784 expression_t *expression = parse_assignment_expression();
2786 if (env->must_be_constant && !is_initializer_constant(expression)) {
2787 errorf(&expression->base.source_position,
2788 "Initialisation expression '%E' is not constant",
2793 /* we are already outside, ... */
2794 type_t *const outer_type_skip = skip_typeref(outer_type);
2795 if (is_type_compound(outer_type_skip) &&
2796 !outer_type_skip->compound.compound->complete) {
2797 goto error_parse_next;
2802 /* handle { "string" } special case */
2803 if ((expression->kind == EXPR_STRING_LITERAL
2804 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2805 && outer_type != NULL) {
2806 sub = initializer_from_expression(outer_type, expression);
2808 if (token.type == ',') {
2811 if (token.type != '}' && warning.other) {
2812 warningf(HERE, "excessive elements in initializer for type '%T'",
2815 /* TODO: eat , ... */
2820 /* descend into subtypes until expression matches type */
2822 orig_type = path->top_type;
2823 type = skip_typeref(orig_type);
2825 sub = initializer_from_expression(orig_type, expression);
2829 if (!is_type_valid(type)) {
2832 if (is_type_scalar(type)) {
2833 errorf(&expression->base.source_position,
2834 "expression '%E' doesn't match expected type '%T'",
2835 expression, orig_type);
2839 descend_into_subtype(path);
2843 /* update largest index of top array */
2844 const type_path_entry_t *first = &path->path[0];
2845 type_t *first_type = first->type;
2846 first_type = skip_typeref(first_type);
2847 if (is_type_array(first_type)) {
2848 size_t index = first->v.index;
2849 if (index > path->max_index)
2850 path->max_index = index;
2854 /* append to initializers list */
2855 ARR_APP1(initializer_t*, initializers, sub);
2858 if (warning.other) {
2859 if (env->entity != NULL) {
2860 warningf(HERE, "excess elements in struct initializer for '%Y'",
2861 env->entity->base.symbol);
2863 warningf(HERE, "excess elements in struct initializer");
2869 if (token.type == '}') {
2873 if (token.type == '}') {
2878 /* advance to the next declaration if we are not at the end */
2879 advance_current_object(path, top_path_level);
2880 orig_type = path->top_type;
2881 if (orig_type != NULL)
2882 type = skip_typeref(orig_type);
2888 size_t len = ARR_LEN(initializers);
2889 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2890 initializer_t *result = allocate_ast_zero(size);
2891 result->kind = INITIALIZER_LIST;
2892 result->list.len = len;
2893 memcpy(&result->list.initializers, initializers,
2894 len * sizeof(initializers[0]));
2896 DEL_ARR_F(initializers);
2897 ascend_to(path, top_path_level+1);
2902 skip_initializers();
2903 DEL_ARR_F(initializers);
2904 ascend_to(path, top_path_level+1);
2909 * Parses an initializer. Parsers either a compound literal
2910 * (env->declaration == NULL) or an initializer of a declaration.
2912 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2914 type_t *type = skip_typeref(env->type);
2915 initializer_t *result = NULL;
2918 if (is_type_scalar(type)) {
2919 result = parse_scalar_initializer(type, env->must_be_constant);
2920 } else if (token.type == '{') {
2924 memset(&path, 0, sizeof(path));
2925 path.top_type = env->type;
2926 path.path = NEW_ARR_F(type_path_entry_t, 0);
2928 descend_into_subtype(&path);
2930 add_anchor_token('}');
2931 result = parse_sub_initializer(&path, env->type, 1, env);
2932 rem_anchor_token('}');
2934 max_index = path.max_index;
2935 DEL_ARR_F(path.path);
2939 /* parse_scalar_initializer() also works in this case: we simply
2940 * have an expression without {} around it */
2941 result = parse_scalar_initializer(type, env->must_be_constant);
2944 /* § 6.7.8 (22) array initializers for arrays with unknown size determine
2945 * the array type size */
2946 if (is_type_array(type) && type->array.size_expression == NULL
2947 && result != NULL) {
2949 switch (result->kind) {
2950 case INITIALIZER_LIST:
2951 size = max_index + 1;
2954 case INITIALIZER_STRING:
2955 size = result->string.string.size;
2958 case INITIALIZER_WIDE_STRING:
2959 size = result->wide_string.string.size;
2962 case INITIALIZER_DESIGNATOR:
2963 case INITIALIZER_VALUE:
2964 /* can happen for parse errors */
2969 internal_errorf(HERE, "invalid initializer type");
2972 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2973 cnst->base.type = type_size_t;
2974 cnst->conste.v.int_value = size;
2976 type_t *new_type = duplicate_type(type);
2978 new_type->array.size_expression = cnst;
2979 new_type->array.size_constant = true;
2980 new_type->array.has_implicit_size = true;
2981 new_type->array.size = size;
2982 env->type = new_type;
2990 static void append_entity(scope_t *scope, entity_t *entity)
2992 if (scope->last_entity != NULL) {
2993 scope->last_entity->base.next = entity;
2995 scope->entities = entity;
2997 scope->last_entity = entity;
3001 static compound_t *parse_compound_type_specifier(bool is_struct)
3003 gnu_attribute_t *attributes = NULL;
3004 decl_modifiers_t modifiers = 0;
3011 symbol_t *symbol = NULL;
3012 compound_t *compound = NULL;
3014 if (token.type == T___attribute__) {
3015 modifiers |= parse_attributes(&attributes);
3018 if (token.type == T_IDENTIFIER) {
3019 symbol = token.v.symbol;
3022 namespace_tag_t const namespc =
3023 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
3024 entity_t *entity = get_entity(symbol, namespc);
3025 if (entity != NULL) {
3026 assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION));
3027 compound = &entity->compound;
3028 if (compound->base.parent_scope != current_scope &&
3029 (token.type == '{' || token.type == ';')) {
3030 /* we're in an inner scope and have a definition. Override
3031 existing definition in outer scope */
3033 } else if (compound->complete && token.type == '{') {
3034 assert(symbol != NULL);
3035 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
3036 is_struct ? "struct" : "union", symbol,
3037 &compound->base.source_position);
3038 /* clear members in the hope to avoid further errors */
3039 compound->members.entities = NULL;
3042 } else if (token.type != '{') {
3044 parse_error_expected("while parsing struct type specifier",
3045 T_IDENTIFIER, '{', NULL);
3047 parse_error_expected("while parsing union type specifier",
3048 T_IDENTIFIER, '{', NULL);
3054 if (compound == NULL) {
3055 entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
3056 entity_t *entity = allocate_entity_zero(kind);
3057 compound = &entity->compound;
3059 compound->base.namespc =
3060 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
3061 compound->base.source_position = token.source_position;
3062 compound->base.symbol = symbol;
3063 compound->base.parent_scope = current_scope;
3064 if (symbol != NULL) {
3065 environment_push(entity);
3067 append_entity(current_scope, entity);
3070 if (token.type == '{') {
3071 parse_compound_type_entries(compound);
3072 modifiers |= parse_attributes(&attributes);
3074 if (symbol == NULL) {
3075 assert(anonymous_entity == NULL);
3076 anonymous_entity = (entity_t*)compound;
3080 compound->modifiers |= modifiers;
3084 static void parse_enum_entries(type_t *const enum_type)
3088 if (token.type == '}') {
3089 errorf(HERE, "empty enum not allowed");
3094 add_anchor_token('}');
3096 if (token.type != T_IDENTIFIER) {
3097 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
3099 rem_anchor_token('}');
3103 entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE);
3104 entity->enum_value.enum_type = enum_type;
3105 entity->base.symbol = token.v.symbol;
3106 entity->base.source_position = token.source_position;
3109 if (token.type == '=') {
3111 expression_t *value = parse_constant_expression();
3113 value = create_implicit_cast(value, enum_type);
3114 entity->enum_value.value = value;
3119 record_entity(entity, false);
3121 if (token.type != ',')
3124 } while (token.type != '}');
3125 rem_anchor_token('}');
3133 static type_t *parse_enum_specifier(void)
3135 gnu_attribute_t *attributes = NULL;
3140 if (token.type == T_IDENTIFIER) {
3141 symbol = token.v.symbol;
3144 entity = get_entity(symbol, NAMESPACE_ENUM);
3145 assert(entity == NULL || entity->kind == ENTITY_ENUM);
3146 } else if (token.type != '{') {
3147 parse_error_expected("while parsing enum type specifier",
3148 T_IDENTIFIER, '{', NULL);
3155 if (entity == NULL) {
3156 entity = allocate_entity_zero(ENTITY_ENUM);
3157 entity->base.namespc = NAMESPACE_ENUM;
3158 entity->base.source_position = token.source_position;
3159 entity->base.symbol = symbol;
3160 entity->base.parent_scope = current_scope;
3163 type_t *const type = allocate_type_zero(TYPE_ENUM);
3164 type->enumt.enume = &entity->enume;
3166 if (token.type == '{') {
3167 if (entity->enume.complete) {
3168 errorf(HERE, "multiple definitions of 'enum %Y' (previous definition %P)",
3169 symbol, &entity->base.source_position);
3171 if (symbol != NULL) {
3172 environment_push(entity);
3174 append_entity(current_scope, entity);
3175 entity->enume.complete = true;
3177 parse_enum_entries(type);
3178 parse_attributes(&attributes);
3180 if (symbol == NULL) {
3181 assert(anonymous_entity == NULL);
3182 anonymous_entity = entity;
3184 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
3185 errorf(HERE, "'enum %Y' used before definition (incomplete enums are a GNU extension)",
3193 * if a symbol is a typedef to another type, return true
3195 static bool is_typedef_symbol(symbol_t *symbol)
3197 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
3198 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
3201 static type_t *parse_typeof(void)
3208 add_anchor_token(')');
3210 expression_t *expression = NULL;
3212 bool old_type_prop = in_type_prop;
3213 bool old_gcc_extension = in_gcc_extension;
3214 in_type_prop = true;
3216 while (token.type == T___extension__) {
3217 /* This can be a prefix to a typename or an expression. */
3219 in_gcc_extension = true;
3221 switch (token.type) {
3223 if (is_typedef_symbol(token.v.symbol)) {
3224 type = parse_typename();
3226 expression = parse_expression();
3227 type = expression->base.type;
3232 type = parse_typename();
3236 expression = parse_expression();
3237 type = expression->base.type;
3240 in_type_prop = old_type_prop;
3241 in_gcc_extension = old_gcc_extension;
3243 rem_anchor_token(')');
3246 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
3247 typeof_type->typeoft.expression = expression;
3248 typeof_type->typeoft.typeof_type = type;
3255 typedef enum specifiers_t {
3256 SPECIFIER_SIGNED = 1 << 0,
3257 SPECIFIER_UNSIGNED = 1 << 1,
3258 SPECIFIER_LONG = 1 << 2,
3259 SPECIFIER_INT = 1 << 3,
3260 SPECIFIER_DOUBLE = 1 << 4,
3261 SPECIFIER_CHAR = 1 << 5,
3262 SPECIFIER_SHORT = 1 << 6,
3263 SPECIFIER_LONG_LONG = 1 << 7,
3264 SPECIFIER_FLOAT = 1 << 8,
3265 SPECIFIER_BOOL = 1 << 9,
3266 SPECIFIER_VOID = 1 << 10,
3267 SPECIFIER_INT8 = 1 << 11,
3268 SPECIFIER_INT16 = 1 << 12,
3269 SPECIFIER_INT32 = 1 << 13,
3270 SPECIFIER_INT64 = 1 << 14,
3271 SPECIFIER_INT128 = 1 << 15,
3272 SPECIFIER_COMPLEX = 1 << 16,
3273 SPECIFIER_IMAGINARY = 1 << 17,
3276 static type_t *create_builtin_type(symbol_t *const symbol,
3277 type_t *const real_type)
3279 type_t *type = allocate_type_zero(TYPE_BUILTIN);
3280 type->builtin.symbol = symbol;
3281 type->builtin.real_type = real_type;
3283 type_t *result = typehash_insert(type);
3284 if (type != result) {
3291 static type_t *get_typedef_type(symbol_t *symbol)
3293 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3294 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
3297 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
3298 type->typedeft.typedefe = &entity->typedefe;
3304 * check for the allowed MS alignment values.
3306 static bool check_alignment_value(long long intvalue)
3308 if (intvalue < 1 || intvalue > 8192) {
3309 errorf(HERE, "illegal alignment value");
3312 unsigned v = (unsigned)intvalue;
3313 for (unsigned i = 1; i <= 8192; i += i) {
3317 errorf(HERE, "alignment must be power of two");
3321 #define DET_MOD(name, tag) do { \
3322 if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \
3323 *modifiers |= tag; \
3326 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
3328 decl_modifiers_t *modifiers = &specifiers->modifiers;
3331 if (token.type == T_restrict) {
3333 DET_MOD(restrict, DM_RESTRICT);
3335 } else if (token.type != T_IDENTIFIER)
3337 symbol_t *symbol = token.v.symbol;
3338 if (symbol == sym_align) {
3341 if (token.type != T_INTEGER)
3343 if (check_alignment_value(token.v.intvalue)) {
3344 if (specifiers->alignment != 0 && warning.other)
3345 warningf(HERE, "align used more than once");
3346 specifiers->alignment = (unsigned char)token.v.intvalue;
3350 } else if (symbol == sym_allocate) {
3353 if (token.type != T_IDENTIFIER)
3355 (void)token.v.symbol;
3357 } else if (symbol == sym_dllimport) {
3359 DET_MOD(dllimport, DM_DLLIMPORT);
3360 } else if (symbol == sym_dllexport) {
3362 DET_MOD(dllexport, DM_DLLEXPORT);
3363 } else if (symbol == sym_thread) {
3365 DET_MOD(thread, DM_THREAD);
3366 } else if (symbol == sym_naked) {
3368 DET_MOD(naked, DM_NAKED);
3369 } else if (symbol == sym_noinline) {
3371 DET_MOD(noinline, DM_NOINLINE);
3372 } else if (symbol == sym_noreturn) {
3374 DET_MOD(noreturn, DM_NORETURN);
3375 } else if (symbol == sym_nothrow) {
3377 DET_MOD(nothrow, DM_NOTHROW);
3378 } else if (symbol == sym_novtable) {
3380 DET_MOD(novtable, DM_NOVTABLE);
3381 } else if (symbol == sym_property) {
3385 bool is_get = false;
3386 if (token.type != T_IDENTIFIER)
3388 if (token.v.symbol == sym_get) {
3390 } else if (token.v.symbol == sym_put) {
3392 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3397 if (token.type != T_IDENTIFIER)
3400 if (specifiers->get_property_sym != NULL) {
3401 errorf(HERE, "get property name already specified");
3403 specifiers->get_property_sym = token.v.symbol;
3406 if (specifiers->put_property_sym != NULL) {
3407 errorf(HERE, "put property name already specified");
3409 specifiers->put_property_sym = token.v.symbol;
3413 if (token.type == ',') {
3420 } else if (symbol == sym_selectany) {
3422 DET_MOD(selectany, DM_SELECTANY);
3423 } else if (symbol == sym_uuid) {
3426 if (token.type != T_STRING_LITERAL)
3430 } else if (symbol == sym_deprecated) {
3432 if (specifiers->deprecated != 0 && warning.other)
3433 warningf(HERE, "deprecated used more than once");
3434 specifiers->deprecated = true;
3435 if (token.type == '(') {
3437 if (token.type == T_STRING_LITERAL) {
3438 specifiers->deprecated_string = token.v.string.begin;
3441 errorf(HERE, "string literal expected");
3445 } else if (symbol == sym_noalias) {
3447 DET_MOD(noalias, DM_NOALIAS);
3450 warningf(HERE, "Unknown modifier '%Y' ignored", token.v.symbol);
3452 if (token.type == '(')
3456 if (token.type == ',')
3463 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
3465 entity_t *entity = allocate_entity_zero(kind);
3466 entity->base.source_position = *HERE;
3467 entity->base.symbol = symbol;
3468 if (is_declaration(entity)) {
3469 entity->declaration.type = type_error_type;
3470 entity->declaration.implicit = true;
3471 } else if (kind == ENTITY_TYPEDEF) {
3472 entity->typedefe.type = type_error_type;
3473 entity->typedefe.builtin = true;
3475 record_entity(entity, false);
3479 static void parse_microsoft_based(based_spec_t *based_spec)
3481 if (token.type != T_IDENTIFIER) {
3482 parse_error_expected("while parsing __based", T_IDENTIFIER, NULL);
3485 symbol_t *symbol = token.v.symbol;
3486 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3488 if (entity == NULL || entity->base.kind != ENTITY_VARIABLE) {
3489 errorf(HERE, "'%Y' is not a variable name.", symbol);
3490 entity = create_error_entity(symbol, ENTITY_VARIABLE);
3492 variable_t *variable = &entity->variable;
3494 if (based_spec->base_variable != NULL) {
3495 errorf(HERE, "__based type qualifier specified more than once");
3497 based_spec->source_position = token.source_position;
3498 based_spec->base_variable = variable;
3500 type_t *const type = variable->base.type;
3502 if (is_type_valid(type)) {
3503 if (! is_type_pointer(skip_typeref(type))) {
3504 errorf(HERE, "variable in __based modifier must have pointer type instead of '%T'", type);
3506 if (variable->base.base.parent_scope != file_scope) {
3507 errorf(HERE, "a nonstatic local variable may not be used in a __based specification");
3515 * Finish the construction of a struct type by calculating
3516 * its size, offsets, alignment.
3518 static void finish_struct_type(compound_type_t *type)
3520 assert(type->compound != NULL);
3522 compound_t *compound = type->compound;
3523 if (!compound->complete)
3528 il_alignment_t alignment = 1;
3529 bool need_pad = false;
3531 entity_t *entry = compound->members.entities;
3532 for (; entry != NULL; entry = entry->base.next) {
3533 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3536 type_t *m_type = skip_typeref(entry->declaration.type);
3537 if (! is_type_valid(m_type)) {
3538 /* simply ignore errors here */
3541 il_alignment_t m_alignment = m_type->base.alignment;
3542 if (m_alignment > alignment)
3543 alignment = m_alignment;
3545 offset = (size + m_alignment - 1) & -m_alignment;
3549 entry->compound_member.offset = offset;
3550 size = offset + m_type->base.size;
3552 if (type->base.alignment != 0) {
3553 alignment = type->base.alignment;
3556 offset = (size + alignment - 1) & -alignment;
3560 if (warning.padded && need_pad) {
3561 warningf(&compound->base.source_position, "'%T' needs padding", type);
3563 if (warning.packed && !need_pad) {
3564 warningf(&compound->base.source_position,
3565 "superfluous packed attribute on '%T'", type);
3568 type->base.size = offset;
3569 type->base.alignment = alignment;
3573 * Finish the construction of an union type by calculating
3574 * its size and alignment.
3576 static void finish_union_type(compound_type_t *type)
3578 assert(type->compound != NULL);
3580 compound_t *compound = type->compound;
3581 if (! compound->complete)
3585 il_alignment_t alignment = 1;
3587 entity_t *entry = compound->members.entities;
3588 for (; entry != NULL; entry = entry->base.next) {
3589 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3592 type_t *m_type = skip_typeref(entry->declaration.type);
3593 if (! is_type_valid(m_type))
3596 entry->compound_member.offset = 0;
3597 if (m_type->base.size > size)
3598 size = m_type->base.size;
3599 if (m_type->base.alignment > alignment)
3600 alignment = m_type->base.alignment;
3602 if (type->base.alignment != 0) {
3603 alignment = type->base.alignment;
3605 size = (size + alignment - 1) & -alignment;
3606 type->base.size = size;
3607 type->base.alignment = alignment;
3610 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3612 type_t *type = NULL;
3613 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3614 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3615 unsigned type_specifiers = 0;
3616 bool newtype = false;
3617 bool saw_error = false;
3618 bool old_gcc_extension = in_gcc_extension;
3620 specifiers->source_position = token.source_position;
3623 specifiers->modifiers
3624 |= parse_attributes(&specifiers->gnu_attributes);
3625 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3626 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3628 switch (token.type) {
3630 #define MATCH_STORAGE_CLASS(token, class) \
3632 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3633 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3635 specifiers->storage_class = class; \
3636 if (specifiers->thread_local) \
3637 goto check_thread_storage_class; \
3641 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3642 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3643 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3644 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3645 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3650 add_anchor_token(')');
3651 parse_microsoft_extended_decl_modifier(specifiers);
3652 rem_anchor_token(')');
3657 if (specifiers->thread_local) {
3658 errorf(HERE, "duplicate '__thread'");
3660 specifiers->thread_local = true;
3661 check_thread_storage_class:
3662 switch (specifiers->storage_class) {
3663 case STORAGE_CLASS_EXTERN:
3664 case STORAGE_CLASS_NONE:
3665 case STORAGE_CLASS_STATIC:
3669 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3670 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3671 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3672 wrong_thread_stoarge_class:
3673 errorf(HERE, "'__thread' used with '%s'", wrong);
3680 /* type qualifiers */
3681 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3683 qualifiers |= qualifier; \
3687 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3688 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3689 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3690 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3691 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3692 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3693 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3694 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3696 case T___extension__:
3698 in_gcc_extension = true;
3701 /* type specifiers */
3702 #define MATCH_SPECIFIER(token, specifier, name) \
3704 if (type_specifiers & specifier) { \
3705 errorf(HERE, "multiple " name " type specifiers given"); \
3707 type_specifiers |= specifier; \
3712 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3713 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3714 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3715 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3716 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3717 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3718 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3719 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3720 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3721 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3722 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3723 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3724 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3725 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3726 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3727 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3728 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3730 case T__forceinline:
3731 /* only in microsoft mode */
3732 specifiers->modifiers |= DM_FORCEINLINE;
3737 specifiers->is_inline = true;
3741 if (type_specifiers & SPECIFIER_LONG_LONG) {
3742 errorf(HERE, "multiple type specifiers given");
3743 } else if (type_specifiers & SPECIFIER_LONG) {
3744 type_specifiers |= SPECIFIER_LONG_LONG;
3746 type_specifiers |= SPECIFIER_LONG;
3752 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3754 type->compound.compound = parse_compound_type_specifier(true);
3755 finish_struct_type(&type->compound);
3759 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3760 type->compound.compound = parse_compound_type_specifier(false);
3761 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3762 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3763 finish_union_type(&type->compound);
3767 type = parse_enum_specifier();
3770 type = parse_typeof();
3772 case T___builtin_va_list:
3773 type = duplicate_type(type_valist);
3777 case T_IDENTIFIER: {
3778 /* only parse identifier if we haven't found a type yet */
3779 if (type != NULL || type_specifiers != 0) {
3780 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3781 * declaration, so it doesn't generate errors about expecting '(' or
3783 switch (look_ahead(1)->type) {
3790 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3794 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3799 goto finish_specifiers;
3803 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3804 if (typedef_type == NULL) {
3805 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3806 * declaration, so it doesn't generate 'implicit int' followed by more
3807 * errors later on. */
3808 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3814 errorf(HERE, "%K does not name a type", &token);
3817 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3819 type = allocate_type_zero(TYPE_TYPEDEF);
3820 type->typedeft.typedefe = &entity->typedefe;
3824 if (la1_type == '&' || la1_type == '*')
3825 goto finish_specifiers;
3830 goto finish_specifiers;
3835 type = typedef_type;
3839 /* function specifier */
3841 goto finish_specifiers;
3846 in_gcc_extension = old_gcc_extension;
3848 if (type == NULL || (saw_error && type_specifiers != 0)) {
3849 atomic_type_kind_t atomic_type;
3851 /* match valid basic types */
3852 switch (type_specifiers) {
3853 case SPECIFIER_VOID:
3854 atomic_type = ATOMIC_TYPE_VOID;
3856 case SPECIFIER_CHAR:
3857 atomic_type = ATOMIC_TYPE_CHAR;
3859 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3860 atomic_type = ATOMIC_TYPE_SCHAR;
3862 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3863 atomic_type = ATOMIC_TYPE_UCHAR;
3865 case SPECIFIER_SHORT:
3866 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3867 case SPECIFIER_SHORT | SPECIFIER_INT:
3868 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3869 atomic_type = ATOMIC_TYPE_SHORT;
3871 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3872 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3873 atomic_type = ATOMIC_TYPE_USHORT;
3876 case SPECIFIER_SIGNED:
3877 case SPECIFIER_SIGNED | SPECIFIER_INT:
3878 atomic_type = ATOMIC_TYPE_INT;
3880 case SPECIFIER_UNSIGNED:
3881 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3882 atomic_type = ATOMIC_TYPE_UINT;
3884 case SPECIFIER_LONG:
3885 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3886 case SPECIFIER_LONG | SPECIFIER_INT:
3887 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3888 atomic_type = ATOMIC_TYPE_LONG;
3890 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3891 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3892 atomic_type = ATOMIC_TYPE_ULONG;
3895 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3896 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3897 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3898 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3900 atomic_type = ATOMIC_TYPE_LONGLONG;
3901 goto warn_about_long_long;
3903 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3904 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3906 atomic_type = ATOMIC_TYPE_ULONGLONG;
3907 warn_about_long_long:
3908 if (warning.long_long) {
3909 warningf(&specifiers->source_position,
3910 "ISO C90 does not support 'long long'");
3914 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3915 atomic_type = unsigned_int8_type_kind;
3918 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3919 atomic_type = unsigned_int16_type_kind;
3922 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3923 atomic_type = unsigned_int32_type_kind;
3926 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3927 atomic_type = unsigned_int64_type_kind;
3930 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3931 atomic_type = unsigned_int128_type_kind;
3934 case SPECIFIER_INT8:
3935 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3936 atomic_type = int8_type_kind;
3939 case SPECIFIER_INT16:
3940 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3941 atomic_type = int16_type_kind;
3944 case SPECIFIER_INT32:
3945 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3946 atomic_type = int32_type_kind;
3949 case SPECIFIER_INT64:
3950 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3951 atomic_type = int64_type_kind;
3954 case SPECIFIER_INT128:
3955 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3956 atomic_type = int128_type_kind;
3959 case SPECIFIER_FLOAT:
3960 atomic_type = ATOMIC_TYPE_FLOAT;
3962 case SPECIFIER_DOUBLE:
3963 atomic_type = ATOMIC_TYPE_DOUBLE;
3965 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3966 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3968 case SPECIFIER_BOOL:
3969 atomic_type = ATOMIC_TYPE_BOOL;
3971 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3972 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3973 atomic_type = ATOMIC_TYPE_FLOAT;
3975 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3976 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3977 atomic_type = ATOMIC_TYPE_DOUBLE;
3979 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3980 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3981 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3984 /* invalid specifier combination, give an error message */
3985 if (type_specifiers == 0) {
3989 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3990 if (!(c_mode & _CXX) && !strict_mode) {
3991 if (warning.implicit_int) {
3992 warningf(HERE, "no type specifiers in declaration, using 'int'");
3994 atomic_type = ATOMIC_TYPE_INT;
3997 errorf(HERE, "no type specifiers given in declaration");
3999 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
4000 (type_specifiers & SPECIFIER_UNSIGNED)) {
4001 errorf(HERE, "signed and unsigned specifiers given");
4002 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
4003 errorf(HERE, "only integer types can be signed or unsigned");
4005 errorf(HERE, "multiple datatypes in declaration");
4010 if (type_specifiers & SPECIFIER_COMPLEX) {
4011 type = allocate_type_zero(TYPE_COMPLEX);
4012 type->complex.akind = atomic_type;
4013 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
4014 type = allocate_type_zero(TYPE_IMAGINARY);
4015 type->imaginary.akind = atomic_type;
4017 type = allocate_type_zero(TYPE_ATOMIC);
4018 type->atomic.akind = atomic_type;
4021 } else if (type_specifiers != 0) {
4022 errorf(HERE, "multiple datatypes in declaration");
4025 /* FIXME: check type qualifiers here */
4027 type->base.qualifiers = qualifiers;
4028 type->base.modifiers = modifiers;
4030 type_t *result = typehash_insert(type);
4031 if (newtype && result != type) {
4035 specifiers->type = result;
4039 specifiers->type = type_error_type;
4043 static type_qualifiers_t parse_type_qualifiers(void)
4045 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
4048 switch (token.type) {
4049 /* type qualifiers */
4050 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
4051 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
4052 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
4053 /* microsoft extended type modifiers */
4054 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4055 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4056 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4057 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4058 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4067 * Parses an K&R identifier list
4069 static void parse_identifier_list(scope_t *scope)
4072 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
4073 entity->base.source_position = token.source_position;
4074 entity->base.namespc = NAMESPACE_NORMAL;
4075 entity->base.symbol = token.v.symbol;
4076 /* a K&R parameter has no type, yet */
4079 append_entity(scope, entity);
4081 if (token.type != ',') {
4085 } while (token.type == T_IDENTIFIER);
4088 static entity_t *parse_parameter(void)
4090 declaration_specifiers_t specifiers;
4091 memset(&specifiers, 0, sizeof(specifiers));
4093 parse_declaration_specifiers(&specifiers);
4095 entity_t *entity = parse_declarator(&specifiers,
4096 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4097 anonymous_entity = NULL;
4101 static void semantic_parameter_incomplete(const entity_t *entity)
4103 assert(entity->kind == ENTITY_PARAMETER);
4105 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
4106 * list in a function declarator that is part of a
4107 * definition of that function shall not have
4108 * incomplete type. */
4109 type_t *type = skip_typeref(entity->declaration.type);
4110 if (is_type_incomplete(type)) {
4111 errorf(&entity->base.source_position,
4112 "parameter '%Y' has incomplete type '%T'", entity->base.symbol,
4113 entity->declaration.type);
4118 * Parses function type parameters (and optionally creates variable_t entities
4119 * for them in a scope)
4121 static void parse_parameters(function_type_t *type, scope_t *scope)
4124 add_anchor_token(')');
4125 int saved_comma_state = save_and_reset_anchor_state(',');
4127 if (token.type == T_IDENTIFIER &&
4128 !is_typedef_symbol(token.v.symbol)) {
4129 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4130 if (la1_type == ',' || la1_type == ')') {
4131 type->kr_style_parameters = true;
4132 parse_identifier_list(scope);
4133 goto parameters_finished;
4137 if (token.type == ')') {
4138 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4139 if (!(c_mode & _CXX))
4140 type->unspecified_parameters = true;
4141 goto parameters_finished;
4144 function_parameter_t *parameter;
4145 function_parameter_t *last_parameter = NULL;
4148 switch (token.type) {
4151 type->variadic = true;
4152 goto parameters_finished;
4155 case T___extension__:
4158 entity_t *entity = parse_parameter();
4159 if (entity->kind == ENTITY_TYPEDEF) {
4160 errorf(&entity->base.source_position,
4161 "typedef not allowed as function parameter");
4164 assert(is_declaration(entity));
4166 /* func(void) is not a parameter */
4167 if (last_parameter == NULL
4168 && token.type == ')'
4169 && entity->base.symbol == NULL
4170 && skip_typeref(entity->declaration.type) == type_void) {
4171 goto parameters_finished;
4173 semantic_parameter_incomplete(entity);
4175 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4176 memset(parameter, 0, sizeof(parameter[0]));
4177 parameter->type = entity->declaration.type;
4179 if (scope != NULL) {
4180 append_entity(scope, entity);
4183 if (last_parameter != NULL) {
4184 last_parameter->next = parameter;
4186 type->parameters = parameter;
4188 last_parameter = parameter;
4193 goto parameters_finished;
4195 if (token.type != ',') {
4196 goto parameters_finished;
4202 parameters_finished:
4203 rem_anchor_token(')');
4207 restore_anchor_state(',', saved_comma_state);
4210 typedef enum construct_type_kind_t {
4213 CONSTRUCT_REFERENCE,
4216 } construct_type_kind_t;
4218 typedef struct construct_type_t construct_type_t;
4219 struct construct_type_t {
4220 construct_type_kind_t kind;
4221 construct_type_t *next;
4224 typedef struct parsed_pointer_t parsed_pointer_t;
4225 struct parsed_pointer_t {
4226 construct_type_t construct_type;
4227 type_qualifiers_t type_qualifiers;
4228 variable_t *base_variable; /**< MS __based extension. */
4231 typedef struct parsed_reference_t parsed_reference_t;
4232 struct parsed_reference_t {
4233 construct_type_t construct_type;
4236 typedef struct construct_function_type_t construct_function_type_t;
4237 struct construct_function_type_t {
4238 construct_type_t construct_type;
4239 type_t *function_type;
4242 typedef struct parsed_array_t parsed_array_t;
4243 struct parsed_array_t {
4244 construct_type_t construct_type;
4245 type_qualifiers_t type_qualifiers;
4251 typedef struct construct_base_type_t construct_base_type_t;
4252 struct construct_base_type_t {
4253 construct_type_t construct_type;
4257 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4261 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4262 memset(pointer, 0, sizeof(pointer[0]));
4263 pointer->construct_type.kind = CONSTRUCT_POINTER;
4264 pointer->type_qualifiers = parse_type_qualifiers();
4265 pointer->base_variable = base_variable;
4267 return &pointer->construct_type;
4270 static construct_type_t *parse_reference_declarator(void)
4274 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4275 memset(reference, 0, sizeof(reference[0]));
4276 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4278 return (construct_type_t*)reference;
4281 static construct_type_t *parse_array_declarator(void)
4284 add_anchor_token(']');
4286 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4287 memset(array, 0, sizeof(array[0]));
4288 array->construct_type.kind = CONSTRUCT_ARRAY;
4290 if (token.type == T_static) {
4291 array->is_static = true;
4295 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4296 if (type_qualifiers != 0) {
4297 if (token.type == T_static) {
4298 array->is_static = true;
4302 array->type_qualifiers = type_qualifiers;
4304 if (token.type == '*' && look_ahead(1)->type == ']') {
4305 array->is_variable = true;
4307 } else if (token.type != ']') {
4308 array->size = parse_assignment_expression();
4311 rem_anchor_token(']');
4315 return &array->construct_type;
4318 static construct_type_t *parse_function_declarator(scope_t *scope,
4319 decl_modifiers_t modifiers)
4321 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4322 function_type_t *ftype = &type->function;
4324 ftype->linkage = current_linkage;
4326 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4327 case DM_NONE: break;
4328 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4329 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4330 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4331 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4334 errorf(HERE, "multiple calling conventions in declaration");
4338 parse_parameters(ftype, scope);
4340 construct_function_type_t *construct_function_type =
4341 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4342 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4343 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4344 construct_function_type->function_type = type;
4346 return &construct_function_type->construct_type;
4349 typedef struct parse_declarator_env_t {
4350 decl_modifiers_t modifiers;
4352 source_position_t source_position;
4354 } parse_declarator_env_t;
4356 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4357 bool may_be_abstract)
4359 /* construct a single linked list of construct_type_t's which describe
4360 * how to construct the final declarator type */
4361 construct_type_t *first = NULL;
4362 construct_type_t *last = NULL;
4363 gnu_attribute_t *attributes = NULL;
4365 decl_modifiers_t modifiers = parse_attributes(&attributes);
4367 /* MS __based extension */
4368 based_spec_t base_spec;
4369 base_spec.base_variable = NULL;
4372 construct_type_t *type;
4373 switch (token.type) {
4375 if (!(c_mode & _CXX))
4376 errorf(HERE, "references are only available for C++");
4377 if (base_spec.base_variable != NULL && warning.other) {
4378 warningf(&base_spec.source_position,
4379 "__based does not precede a pointer operator, ignored");
4381 type = parse_reference_declarator();
4383 base_spec.base_variable = NULL;
4387 type = parse_pointer_declarator(base_spec.base_variable);
4389 base_spec.base_variable = NULL;
4395 add_anchor_token(')');
4396 parse_microsoft_based(&base_spec);
4397 rem_anchor_token(')');
4402 goto ptr_operator_end;
4413 /* TODO: find out if this is correct */
4414 modifiers |= parse_attributes(&attributes);
4417 if (base_spec.base_variable != NULL && warning.other) {
4418 warningf(&base_spec.source_position,
4419 "__based does not precede a pointer operator, ignored");
4423 modifiers |= env->modifiers;
4424 env->modifiers = modifiers;
4427 construct_type_t *inner_types = NULL;
4429 switch (token.type) {
4432 errorf(HERE, "no identifier expected in typename");
4434 env->symbol = token.v.symbol;
4435 env->source_position = token.source_position;
4441 add_anchor_token(')');
4442 inner_types = parse_inner_declarator(env, may_be_abstract);
4443 if (inner_types != NULL) {
4444 /* All later declarators only modify the return type */
4447 rem_anchor_token(')');
4451 if (may_be_abstract)
4453 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4458 construct_type_t *p = last;
4461 construct_type_t *type;
4462 switch (token.type) {
4464 scope_t *scope = NULL;
4466 scope = &env->parameters;
4468 type = parse_function_declarator(scope, modifiers);
4472 type = parse_array_declarator();
4475 goto declarator_finished;
4478 /* insert in the middle of the list (behind p) */
4480 type->next = p->next;
4491 declarator_finished:
4492 /* append inner_types at the end of the list, we don't to set last anymore
4493 * as it's not needed anymore */
4495 assert(first == NULL);
4496 first = inner_types;
4498 last->next = inner_types;
4506 static void parse_declaration_attributes(entity_t *entity)
4508 gnu_attribute_t *attributes = NULL;
4509 decl_modifiers_t modifiers = parse_attributes(&attributes);
4515 if (entity->kind == ENTITY_TYPEDEF) {
4516 modifiers |= entity->typedefe.modifiers;
4517 type = entity->typedefe.type;
4519 assert(is_declaration(entity));
4520 modifiers |= entity->declaration.modifiers;
4521 type = entity->declaration.type;
4526 /* handle these strange/stupid mode attributes */
4527 gnu_attribute_t *attribute = attributes;
4528 for ( ; attribute != NULL; attribute = attribute->next) {
4529 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4532 atomic_type_kind_t akind = attribute->u.akind;
4533 if (!is_type_signed(type)) {
4535 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4536 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4537 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4538 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4540 panic("invalid akind in mode attribute");
4544 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break;
4545 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break;
4546 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break;
4547 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break;
4549 panic("invalid akind in mode attribute");
4553 type = make_atomic_type(akind, type->base.qualifiers);
4556 type_modifiers_t type_modifiers = type->base.modifiers;
4557 if (modifiers & DM_TRANSPARENT_UNION)
4558 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4560 if (type->base.modifiers != type_modifiers) {
4561 type_t *copy = duplicate_type(type);
4562 copy->base.modifiers = type_modifiers;
4564 type = typehash_insert(copy);
4566 obstack_free(type_obst, copy);
4570 if (entity->kind == ENTITY_TYPEDEF) {
4571 entity->typedefe.type = type;
4572 entity->typedefe.modifiers = modifiers;
4574 entity->declaration.type = type;
4575 entity->declaration.modifiers = modifiers;
4579 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4581 construct_type_t *iter = construct_list;
4582 for (; iter != NULL; iter = iter->next) {
4583 switch (iter->kind) {
4584 case CONSTRUCT_INVALID:
4585 internal_errorf(HERE, "invalid type construction found");
4586 case CONSTRUCT_FUNCTION: {
4587 construct_function_type_t *construct_function_type
4588 = (construct_function_type_t*) iter;
4590 type_t *function_type = construct_function_type->function_type;
4592 function_type->function.return_type = type;
4594 type_t *skipped_return_type = skip_typeref(type);
4596 if (is_type_function(skipped_return_type)) {
4597 errorf(HERE, "function returning function is not allowed");
4598 } else if (is_type_array(skipped_return_type)) {
4599 errorf(HERE, "function returning array is not allowed");
4601 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4603 "type qualifiers in return type of function type are meaningless");
4607 type = function_type;
4611 case CONSTRUCT_POINTER: {
4612 if (is_type_reference(skip_typeref(type)))
4613 errorf(HERE, "cannot declare a pointer to reference");
4615 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4616 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4620 case CONSTRUCT_REFERENCE:
4621 if (is_type_reference(skip_typeref(type)))
4622 errorf(HERE, "cannot declare a reference to reference");
4624 type = make_reference_type(type);
4627 case CONSTRUCT_ARRAY: {
4628 if (is_type_reference(skip_typeref(type)))
4629 errorf(HERE, "cannot declare an array of references");
4631 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4632 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4634 expression_t *size_expression = parsed_array->size;
4635 if (size_expression != NULL) {
4637 = create_implicit_cast(size_expression, type_size_t);
4640 array_type->base.qualifiers = parsed_array->type_qualifiers;
4641 array_type->array.element_type = type;
4642 array_type->array.is_static = parsed_array->is_static;
4643 array_type->array.is_variable = parsed_array->is_variable;
4644 array_type->array.size_expression = size_expression;
4646 if (size_expression != NULL) {
4647 if (is_constant_expression(size_expression)) {
4648 array_type->array.size_constant = true;
4649 array_type->array.size
4650 = fold_constant(size_expression);
4652 array_type->array.is_vla = true;
4656 type_t *skipped_type = skip_typeref(type);
4658 if (is_type_incomplete(skipped_type)) {
4659 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4660 } else if (is_type_function(skipped_type)) {
4661 errorf(HERE, "array of functions is not allowed");
4668 type_t *hashed_type = typehash_insert(type);
4669 if (hashed_type != type) {
4670 /* the function type was constructed earlier freeing it here will
4671 * destroy other types... */
4672 if (iter->kind != CONSTRUCT_FUNCTION) {
4682 static type_t *automatic_type_conversion(type_t *orig_type);
4684 static type_t *semantic_parameter(const source_position_t *pos,
4686 const declaration_specifiers_t *specifiers,
4689 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4690 * shall be adjusted to ``qualified pointer to type'',
4692 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4693 * type'' shall be adjusted to ``pointer to function
4694 * returning type'', as in 6.3.2.1. */
4695 type = automatic_type_conversion(type);
4697 if (specifiers->is_inline && is_type_valid(type)) {
4698 errorf(pos, "parameter '%Y' declared 'inline'", symbol);
4701 /* §6.9.1:6 The declarations in the declaration list shall contain
4702 * no storage-class specifier other than register and no
4703 * initializations. */
4704 if (specifiers->thread_local || (
4705 specifiers->storage_class != STORAGE_CLASS_NONE &&
4706 specifiers->storage_class != STORAGE_CLASS_REGISTER)
4708 errorf(pos, "invalid storage class for parameter '%Y'", symbol);
4711 /* delay test for incomplete type, because we might have (void)
4712 * which is legal but incomplete... */
4717 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4718 declarator_flags_t flags)
4720 parse_declarator_env_t env;
4721 memset(&env, 0, sizeof(env));
4722 env.modifiers = specifiers->modifiers;
4724 construct_type_t *construct_type =
4725 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4727 construct_declarator_type(construct_type, specifiers->type);
4728 type_t *type = skip_typeref(orig_type);
4730 if (construct_type != NULL) {
4731 obstack_free(&temp_obst, construct_type);
4735 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4736 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4737 entity->base.symbol = env.symbol;
4738 entity->base.source_position = env.source_position;
4739 entity->typedefe.type = orig_type;
4741 if (anonymous_entity != NULL) {
4742 if (is_type_compound(type)) {
4743 assert(anonymous_entity->compound.alias == NULL);
4744 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4745 anonymous_entity->kind == ENTITY_UNION);
4746 anonymous_entity->compound.alias = entity;
4747 anonymous_entity = NULL;
4748 } else if (is_type_enum(type)) {
4749 assert(anonymous_entity->enume.alias == NULL);
4750 assert(anonymous_entity->kind == ENTITY_ENUM);
4751 anonymous_entity->enume.alias = entity;
4752 anonymous_entity = NULL;
4756 /* create a declaration type entity */
4757 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4758 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4760 if (specifiers->is_inline && is_type_valid(type)) {
4761 errorf(&env.source_position,
4762 "compound member '%Y' declared 'inline'", env.symbol);
4765 if (specifiers->thread_local ||
4766 specifiers->storage_class != STORAGE_CLASS_NONE) {
4767 errorf(&env.source_position,
4768 "compound member '%Y' must have no storage class",
4771 } else if (flags & DECL_IS_PARAMETER) {
4772 orig_type = semantic_parameter(&env.source_position, type,
4773 specifiers, env.symbol);
4775 entity = allocate_entity_zero(ENTITY_PARAMETER);
4776 } else if (is_type_function(type)) {
4777 entity = allocate_entity_zero(ENTITY_FUNCTION);
4779 entity->function.is_inline = specifiers->is_inline;
4780 entity->function.parameters = env.parameters;
4782 if (specifiers->thread_local || (
4783 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4784 specifiers->storage_class != STORAGE_CLASS_NONE &&
4785 specifiers->storage_class != STORAGE_CLASS_STATIC)
4787 errorf(&env.source_position,
4788 "invalid storage class for function '%Y'", env.symbol);
4791 entity = allocate_entity_zero(ENTITY_VARIABLE);
4793 entity->variable.get_property_sym = specifiers->get_property_sym;
4794 entity->variable.put_property_sym = specifiers->put_property_sym;
4795 if (specifiers->alignment != 0) {
4796 /* TODO: add checks here */
4797 entity->variable.alignment = specifiers->alignment;
4800 if (specifiers->is_inline && is_type_valid(type)) {
4801 errorf(&env.source_position,
4802 "variable '%Y' declared 'inline'", env.symbol);
4805 entity->variable.thread_local = specifiers->thread_local;
4807 bool invalid_storage_class = false;
4808 if (current_scope == file_scope) {
4809 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4810 specifiers->storage_class != STORAGE_CLASS_NONE &&
4811 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4812 invalid_storage_class = true;
4815 if (specifiers->thread_local &&
4816 specifiers->storage_class == STORAGE_CLASS_NONE) {
4817 invalid_storage_class = true;
4820 if (invalid_storage_class) {
4821 errorf(&env.source_position,
4822 "invalid storage class for variable '%Y'", env.symbol);
4826 entity->base.source_position = env.source_position;
4827 entity->base.symbol = env.symbol;
4828 entity->base.namespc = NAMESPACE_NORMAL;
4829 entity->declaration.type = orig_type;
4830 entity->declaration.modifiers = env.modifiers;
4831 entity->declaration.deprecated_string = specifiers->deprecated_string;
4833 storage_class_t storage_class = specifiers->storage_class;
4834 entity->declaration.declared_storage_class = storage_class;
4836 if (storage_class == STORAGE_CLASS_NONE && current_scope != file_scope)
4837 storage_class = STORAGE_CLASS_AUTO;
4838 entity->declaration.storage_class = storage_class;
4841 parse_declaration_attributes(entity);
4846 static type_t *parse_abstract_declarator(type_t *base_type)
4848 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4850 type_t *result = construct_declarator_type(construct_type, base_type);
4851 if (construct_type != NULL) {
4852 obstack_free(&temp_obst, construct_type);
4859 * Check if the declaration of main is suspicious. main should be a
4860 * function with external linkage, returning int, taking either zero
4861 * arguments, two, or three arguments of appropriate types, ie.
4863 * int main([ int argc, char **argv [, char **env ] ]).
4865 * @param decl the declaration to check
4866 * @param type the function type of the declaration
4868 static void check_type_of_main(const entity_t *entity)
4870 const source_position_t *pos = &entity->base.source_position;
4871 if (entity->kind != ENTITY_FUNCTION) {
4872 warningf(pos, "'main' is not a function");
4876 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4877 warningf(pos, "'main' is normally a non-static function");
4880 type_t *type = skip_typeref(entity->declaration.type);
4881 assert(is_type_function(type));
4883 function_type_t *func_type = &type->function;
4884 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4885 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4886 func_type->return_type);
4888 const function_parameter_t *parm = func_type->parameters;
4890 type_t *const first_type = parm->type;
4891 if (!types_compatible(skip_typeref(first_type), type_int)) {
4893 "first argument of 'main' should be 'int', but is '%T'",
4898 type_t *const second_type = parm->type;
4899 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4900 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4904 type_t *const third_type = parm->type;
4905 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4906 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4910 goto warn_arg_count;
4914 warningf(pos, "'main' takes only zero, two or three arguments");
4920 * Check if a symbol is the equal to "main".
4922 static bool is_sym_main(const symbol_t *const sym)
4924 return strcmp(sym->string, "main") == 0;
4927 static void error_redefined_as_different_kind(const source_position_t *pos,
4928 const entity_t *old, entity_kind_t new_kind)
4930 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4931 get_entity_kind_name(old->kind), old->base.symbol,
4932 get_entity_kind_name(new_kind), &old->base.source_position);
4936 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4937 * for various problems that occur for multiple definitions
4939 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4941 const symbol_t *const symbol = entity->base.symbol;
4942 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4943 const source_position_t *pos = &entity->base.source_position;
4945 /* can happen in error cases */
4949 entity_t *previous_entity = get_entity(symbol, namespc);
4950 /* pushing the same entity twice will break the stack structure */
4951 assert(previous_entity != entity);
4953 if (entity->kind == ENTITY_FUNCTION) {
4954 type_t *const orig_type = entity->declaration.type;
4955 type_t *const type = skip_typeref(orig_type);
4957 assert(is_type_function(type));
4958 if (type->function.unspecified_parameters &&
4959 warning.strict_prototypes &&
4960 previous_entity == NULL) {
4961 warningf(pos, "function declaration '%#T' is not a prototype",
4965 if (warning.main && current_scope == file_scope
4966 && is_sym_main(symbol)) {
4967 check_type_of_main(entity);
4971 if (is_declaration(entity) &&
4972 warning.nested_externs &&
4973 entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
4974 current_scope != file_scope) {
4975 warningf(pos, "nested extern declaration of '%#T'",
4976 entity->declaration.type, symbol);
4979 if (previous_entity != NULL &&
4980 previous_entity->base.parent_scope == ¤t_function->parameters &&
4981 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
4982 assert(previous_entity->kind == ENTITY_PARAMETER);
4984 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4985 entity->declaration.type, symbol,
4986 previous_entity->declaration.type, symbol,
4987 &previous_entity->base.source_position);
4991 if (previous_entity != NULL &&
4992 previous_entity->base.parent_scope == current_scope) {
4993 if (previous_entity->kind != entity->kind) {
4994 error_redefined_as_different_kind(pos, previous_entity,
4998 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
4999 errorf(pos, "redeclaration of enum entry '%Y' (declared %P)",
5000 symbol, &previous_entity->base.source_position);
5003 if (previous_entity->kind == ENTITY_TYPEDEF) {
5004 /* TODO: C++ allows this for exactly the same type */
5005 errorf(pos, "redefinition of typedef '%Y' (declared %P)",
5006 symbol, &previous_entity->base.source_position);
5010 /* at this point we should have only VARIABLES or FUNCTIONS */
5011 assert(is_declaration(previous_entity) && is_declaration(entity));
5013 declaration_t *const prev_decl = &previous_entity->declaration;
5014 declaration_t *const decl = &entity->declaration;
5016 /* can happen for K&R style declarations */
5017 if (prev_decl->type == NULL &&
5018 previous_entity->kind == ENTITY_PARAMETER &&
5019 entity->kind == ENTITY_PARAMETER) {
5020 prev_decl->type = decl->type;
5021 prev_decl->storage_class = decl->storage_class;
5022 prev_decl->declared_storage_class = decl->declared_storage_class;
5023 prev_decl->modifiers = decl->modifiers;
5024 prev_decl->deprecated_string = decl->deprecated_string;
5025 return previous_entity;
5028 type_t *const orig_type = decl->type;
5029 assert(orig_type != NULL);
5030 type_t *const type = skip_typeref(orig_type);
5031 type_t * prev_type = skip_typeref(prev_decl->type);
5033 if (!types_compatible(type, prev_type)) {
5035 "declaration '%#T' is incompatible with '%#T' (declared %P)",
5036 orig_type, symbol, prev_decl->type, symbol,
5037 &previous_entity->base.source_position);
5039 unsigned old_storage_class = prev_decl->storage_class;
5040 if (warning.redundant_decls &&
5043 !(prev_decl->modifiers & DM_USED) &&
5044 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
5045 warningf(&previous_entity->base.source_position,
5046 "unnecessary static forward declaration for '%#T'",
5047 prev_decl->type, symbol);
5050 unsigned new_storage_class = decl->storage_class;
5051 if (is_type_incomplete(prev_type)) {
5052 prev_decl->type = type;
5056 /* pretend no storage class means extern for function
5057 * declarations (except if the previous declaration is neither
5058 * none nor extern) */
5059 if (entity->kind == ENTITY_FUNCTION) {
5060 if (prev_type->function.unspecified_parameters) {
5061 prev_decl->type = type;
5065 switch (old_storage_class) {
5066 case STORAGE_CLASS_NONE:
5067 old_storage_class = STORAGE_CLASS_EXTERN;
5070 case STORAGE_CLASS_EXTERN:
5071 if (is_definition) {
5072 if (warning.missing_prototypes &&
5073 prev_type->function.unspecified_parameters &&
5074 !is_sym_main(symbol)) {
5075 warningf(pos, "no previous prototype for '%#T'",
5078 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5079 new_storage_class = STORAGE_CLASS_EXTERN;
5088 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5089 new_storage_class == STORAGE_CLASS_EXTERN) {
5090 warn_redundant_declaration:
5091 if (!is_definition &&
5092 warning.redundant_decls &&
5093 is_type_valid(prev_type) &&
5094 strcmp(previous_entity->base.source_position.input_name,
5095 "<builtin>") != 0) {
5097 "redundant declaration for '%Y' (declared %P)",
5098 symbol, &previous_entity->base.source_position);
5100 } else if (current_function == NULL) {
5101 if (old_storage_class != STORAGE_CLASS_STATIC &&
5102 new_storage_class == STORAGE_CLASS_STATIC) {
5104 "static declaration of '%Y' follows non-static declaration (declared %P)",
5105 symbol, &previous_entity->base.source_position);
5106 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5107 prev_decl->storage_class = STORAGE_CLASS_NONE;
5108 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
5110 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5112 goto error_redeclaration;
5113 goto warn_redundant_declaration;
5115 } else if (is_type_valid(prev_type)) {
5116 if (old_storage_class == new_storage_class) {
5117 error_redeclaration:
5118 errorf(pos, "redeclaration of '%Y' (declared %P)",
5119 symbol, &previous_entity->base.source_position);
5122 "redeclaration of '%Y' with different linkage (declared %P)",
5123 symbol, &previous_entity->base.source_position);
5128 prev_decl->modifiers |= decl->modifiers;
5129 if (entity->kind == ENTITY_FUNCTION) {
5130 previous_entity->function.is_inline |= entity->function.is_inline;
5132 return previous_entity;
5135 if (entity->kind == ENTITY_FUNCTION) {
5136 if (is_definition &&
5137 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5138 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5139 warningf(pos, "no previous prototype for '%#T'",
5140 entity->declaration.type, symbol);
5141 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5142 warningf(pos, "no previous declaration for '%#T'",
5143 entity->declaration.type, symbol);
5146 } else if (warning.missing_declarations &&
5147 entity->kind == ENTITY_VARIABLE &&
5148 current_scope == file_scope) {
5149 declaration_t *declaration = &entity->declaration;
5150 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5151 warningf(pos, "no previous declaration for '%#T'",
5152 declaration->type, symbol);
5157 assert(entity->base.parent_scope == NULL);
5158 assert(current_scope != NULL);
5160 entity->base.parent_scope = current_scope;
5161 entity->base.namespc = NAMESPACE_NORMAL;
5162 environment_push(entity);
5163 append_entity(current_scope, entity);
5168 static void parser_error_multiple_definition(entity_t *entity,
5169 const source_position_t *source_position)
5171 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
5172 entity->base.symbol, &entity->base.source_position);
5175 static bool is_declaration_specifier(const token_t *token,
5176 bool only_specifiers_qualifiers)
5178 switch (token->type) {
5183 return is_typedef_symbol(token->v.symbol);
5185 case T___extension__:
5187 return !only_specifiers_qualifiers;
5194 static void parse_init_declarator_rest(entity_t *entity)
5196 assert(is_declaration(entity));
5197 declaration_t *const declaration = &entity->declaration;
5201 type_t *orig_type = declaration->type;
5202 type_t *type = skip_typeref(orig_type);
5204 if (entity->kind == ENTITY_VARIABLE
5205 && entity->variable.initializer != NULL) {
5206 parser_error_multiple_definition(entity, HERE);
5209 bool must_be_constant = false;
5210 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5211 entity->base.parent_scope == file_scope) {
5212 must_be_constant = true;
5215 if (is_type_function(type)) {
5216 errorf(&entity->base.source_position,
5217 "function '%#T' is initialized like a variable",
5218 orig_type, entity->base.symbol);
5219 orig_type = type_error_type;
5222 parse_initializer_env_t env;
5223 env.type = orig_type;
5224 env.must_be_constant = must_be_constant;
5225 env.entity = entity;
5226 current_init_decl = entity;
5228 initializer_t *initializer = parse_initializer(&env);
5229 current_init_decl = NULL;
5231 if (entity->kind == ENTITY_VARIABLE) {
5232 /* § 6.7.5 (22) array initializers for arrays with unknown size
5233 * determine the array type size */
5234 declaration->type = env.type;
5235 entity->variable.initializer = initializer;
5239 /* parse rest of a declaration without any declarator */
5240 static void parse_anonymous_declaration_rest(
5241 const declaration_specifiers_t *specifiers)
5244 anonymous_entity = NULL;
5246 if (warning.other) {
5247 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5248 specifiers->thread_local) {
5249 warningf(&specifiers->source_position,
5250 "useless storage class in empty declaration");
5253 type_t *type = specifiers->type;
5254 switch (type->kind) {
5255 case TYPE_COMPOUND_STRUCT:
5256 case TYPE_COMPOUND_UNION: {
5257 if (type->compound.compound->base.symbol == NULL) {
5258 warningf(&specifiers->source_position,
5259 "unnamed struct/union that defines no instances");
5268 warningf(&specifiers->source_position, "empty declaration");
5274 static void check_variable_type_complete(entity_t *ent)
5276 if (ent->kind != ENTITY_VARIABLE)
5279 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5280 * type for the object shall be complete [...] */
5281 declaration_t *decl = &ent->declaration;
5282 if (decl->storage_class != STORAGE_CLASS_NONE)
5285 type_t *const orig_type = decl->type;
5286 type_t *const type = skip_typeref(orig_type);
5287 if (!is_type_incomplete(type))
5290 /* GCC allows global arrays without size and assigns them a length of one,
5291 * if no different declaration follows */
5292 if (is_type_array(type) &&
5294 ent->base.parent_scope == file_scope) {
5295 ARR_APP1(declaration_t*, incomplete_arrays, decl);
5299 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5300 orig_type, ent->base.symbol);
5304 static void parse_declaration_rest(entity_t *ndeclaration,
5305 const declaration_specifiers_t *specifiers,
5306 parsed_declaration_func finished_declaration,
5307 declarator_flags_t flags)
5309 add_anchor_token(';');
5310 add_anchor_token(',');
5312 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5314 if (token.type == '=') {
5315 parse_init_declarator_rest(entity);
5316 } else if (entity->kind == ENTITY_VARIABLE) {
5317 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5318 * [...] where the extern specifier is explicitly used. */
5319 declaration_t *decl = &entity->declaration;
5320 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5321 type_t *type = decl->type;
5322 if (is_type_reference(skip_typeref(type))) {
5323 errorf(&entity->base.source_position,
5324 "reference '%#T' must be initialized",
5325 type, entity->base.symbol);
5330 check_variable_type_complete(entity);
5332 if (token.type != ',')
5336 add_anchor_token('=');
5337 ndeclaration = parse_declarator(specifiers, flags);
5338 rem_anchor_token('=');
5343 anonymous_entity = NULL;
5344 rem_anchor_token(';');
5345 rem_anchor_token(',');
5348 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5350 symbol_t *symbol = entity->base.symbol;
5351 if (symbol == NULL) {
5352 errorf(HERE, "anonymous declaration not valid as function parameter");
5356 assert(entity->base.namespc == NAMESPACE_NORMAL);
5357 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5358 if (previous_entity == NULL
5359 || previous_entity->base.parent_scope != current_scope) {
5360 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5365 if (is_definition) {
5366 errorf(HERE, "parameter '%Y' is initialised", entity->base.symbol);
5369 return record_entity(entity, false);
5372 static void parse_declaration(parsed_declaration_func finished_declaration,
5373 declarator_flags_t flags)
5375 declaration_specifiers_t specifiers;
5376 memset(&specifiers, 0, sizeof(specifiers));
5378 add_anchor_token(';');
5379 parse_declaration_specifiers(&specifiers);
5380 rem_anchor_token(';');
5382 if (token.type == ';') {
5383 parse_anonymous_declaration_rest(&specifiers);
5385 entity_t *entity = parse_declarator(&specifiers, flags);
5386 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5390 static type_t *get_default_promoted_type(type_t *orig_type)
5392 type_t *result = orig_type;
5394 type_t *type = skip_typeref(orig_type);
5395 if (is_type_integer(type)) {
5396 result = promote_integer(type);
5397 } else if (type == type_float) {
5398 result = type_double;
5404 static void parse_kr_declaration_list(entity_t *entity)
5406 if (entity->kind != ENTITY_FUNCTION)
5409 type_t *type = skip_typeref(entity->declaration.type);
5410 assert(is_type_function(type));
5411 if (!type->function.kr_style_parameters)
5415 add_anchor_token('{');
5417 /* push function parameters */
5418 size_t const top = environment_top();
5419 scope_t *old_scope = scope_push(&entity->function.parameters);
5421 entity_t *parameter = entity->function.parameters.entities;
5422 for ( ; parameter != NULL; parameter = parameter->base.next) {
5423 assert(parameter->base.parent_scope == NULL);
5424 parameter->base.parent_scope = current_scope;
5425 environment_push(parameter);
5428 /* parse declaration list */
5430 switch (token.type) {
5432 case T___extension__:
5433 /* This covers symbols, which are no type, too, and results in
5434 * better error messages. The typical cases are misspelled type
5435 * names and missing includes. */
5437 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5445 /* pop function parameters */
5446 assert(current_scope == &entity->function.parameters);
5447 scope_pop(old_scope);
5448 environment_pop_to(top);
5450 /* update function type */
5451 type_t *new_type = duplicate_type(type);
5453 function_parameter_t *parameters = NULL;
5454 function_parameter_t *last_parameter = NULL;
5456 parameter = entity->function.parameters.entities;
5457 for (; parameter != NULL; parameter = parameter->base.next) {
5458 type_t *parameter_type = parameter->declaration.type;
5459 if (parameter_type == NULL) {
5461 errorf(HERE, "no type specified for function parameter '%Y'",
5462 parameter->base.symbol);
5464 if (warning.implicit_int) {
5465 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5466 parameter->base.symbol);
5468 parameter_type = type_int;
5469 parameter->declaration.type = parameter_type;
5473 semantic_parameter_incomplete(parameter);
5474 parameter_type = parameter->declaration.type;
5477 * we need the default promoted types for the function type
5479 parameter_type = get_default_promoted_type(parameter_type);
5481 function_parameter_t *function_parameter
5482 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5483 memset(function_parameter, 0, sizeof(function_parameter[0]));
5485 function_parameter->type = parameter_type;
5486 if (last_parameter != NULL) {
5487 last_parameter->next = function_parameter;
5489 parameters = function_parameter;
5491 last_parameter = function_parameter;
5494 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5496 new_type->function.parameters = parameters;
5497 new_type->function.unspecified_parameters = true;
5499 type = typehash_insert(new_type);
5500 if (type != new_type) {
5501 obstack_free(type_obst, new_type);
5504 entity->declaration.type = type;
5506 rem_anchor_token('{');
5509 static bool first_err = true;
5512 * When called with first_err set, prints the name of the current function,
5515 static void print_in_function(void)
5519 diagnosticf("%s: In function '%Y':\n",
5520 current_function->base.base.source_position.input_name,
5521 current_function->base.base.symbol);
5526 * Check if all labels are defined in the current function.
5527 * Check if all labels are used in the current function.
5529 static void check_labels(void)
5531 for (const goto_statement_t *goto_statement = goto_first;
5532 goto_statement != NULL;
5533 goto_statement = goto_statement->next) {
5534 /* skip computed gotos */
5535 if (goto_statement->expression != NULL)
5538 label_t *label = goto_statement->label;
5541 if (label->base.source_position.input_name == NULL) {
5542 print_in_function();
5543 errorf(&goto_statement->base.source_position,
5544 "label '%Y' used but not defined", label->base.symbol);
5548 if (warning.unused_label) {
5549 for (const label_statement_t *label_statement = label_first;
5550 label_statement != NULL;
5551 label_statement = label_statement->next) {
5552 label_t *label = label_statement->label;
5554 if (! label->used) {
5555 print_in_function();
5556 warningf(&label_statement->base.source_position,
5557 "label '%Y' defined but not used", label->base.symbol);
5563 static void warn_unused_entity(entity_t *entity, entity_t *end)
5565 for (; entity != NULL; entity = entity->base.next) {
5566 if (!is_declaration(entity))
5569 declaration_t *declaration = &entity->declaration;
5570 if (declaration->implicit)
5573 if (!declaration->used) {
5574 print_in_function();
5575 const char *what = get_entity_kind_name(entity->kind);
5576 warningf(&entity->base.source_position, "%s '%Y' is unused",
5577 what, entity->base.symbol);
5578 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5579 print_in_function();
5580 const char *what = get_entity_kind_name(entity->kind);
5581 warningf(&entity->base.source_position, "%s '%Y' is never read",
5582 what, entity->base.symbol);
5590 static void check_unused_variables(statement_t *const stmt, void *const env)
5594 switch (stmt->kind) {
5595 case STATEMENT_DECLARATION: {
5596 declaration_statement_t const *const decls = &stmt->declaration;
5597 warn_unused_entity(decls->declarations_begin,
5598 decls->declarations_end);
5603 warn_unused_entity(stmt->fors.scope.entities, NULL);
5612 * Check declarations of current_function for unused entities.
5614 static void check_declarations(void)
5616 if (warning.unused_parameter) {
5617 const scope_t *scope = ¤t_function->parameters;
5619 /* do not issue unused warnings for main */
5620 if (!is_sym_main(current_function->base.base.symbol)) {
5621 warn_unused_entity(scope->entities, NULL);
5624 if (warning.unused_variable) {
5625 walk_statements(current_function->statement, check_unused_variables,
5630 static int determine_truth(expression_t const* const cond)
5633 !is_constant_expression(cond) ? 0 :
5634 fold_constant(cond) != 0 ? 1 :
5638 static void check_reachable(statement_t *);
5640 static bool expression_returns(expression_t const *const expr)
5642 switch (expr->kind) {
5644 expression_t const *const func = expr->call.function;
5645 if (func->kind == EXPR_REFERENCE) {
5646 entity_t *entity = func->reference.entity;
5647 if (entity->kind == ENTITY_FUNCTION
5648 && entity->declaration.modifiers & DM_NORETURN)
5652 if (!expression_returns(func))
5655 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5656 if (!expression_returns(arg->expression))
5663 case EXPR_REFERENCE:
5664 case EXPR_REFERENCE_ENUM_VALUE:
5666 case EXPR_CHARACTER_CONSTANT:
5667 case EXPR_WIDE_CHARACTER_CONSTANT:
5668 case EXPR_STRING_LITERAL:
5669 case EXPR_WIDE_STRING_LITERAL:
5670 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5671 case EXPR_LABEL_ADDRESS:
5672 case EXPR_CLASSIFY_TYPE:
5673 case EXPR_SIZEOF: // TODO handle obscure VLA case
5676 case EXPR_BUILTIN_SYMBOL:
5677 case EXPR_BUILTIN_CONSTANT_P:
5678 case EXPR_BUILTIN_PREFETCH:
5683 case EXPR_STATEMENT:
5684 check_reachable(expr->statement.statement);
5685 // TODO check if statement can be left
5688 case EXPR_CONDITIONAL:
5689 // TODO handle constant expression
5691 if (!expression_returns(expr->conditional.condition))
5694 if (expr->conditional.true_expression != NULL
5695 && expression_returns(expr->conditional.true_expression))
5698 return expression_returns(expr->conditional.false_expression);
5701 return expression_returns(expr->select.compound);
5703 case EXPR_ARRAY_ACCESS:
5705 expression_returns(expr->array_access.array_ref) &&
5706 expression_returns(expr->array_access.index);
5709 return expression_returns(expr->va_starte.ap);
5712 return expression_returns(expr->va_arge.ap);
5714 EXPR_UNARY_CASES_MANDATORY
5715 return expression_returns(expr->unary.value);
5717 case EXPR_UNARY_THROW:
5721 // TODO handle constant lhs of && and ||
5723 expression_returns(expr->binary.left) &&
5724 expression_returns(expr->binary.right);
5730 panic("unhandled expression");
5733 static bool initializer_returns(initializer_t const *const init)
5735 switch (init->kind) {
5736 case INITIALIZER_VALUE:
5737 return expression_returns(init->value.value);
5739 case INITIALIZER_LIST: {
5740 initializer_t * const* i = init->list.initializers;
5741 initializer_t * const* const end = i + init->list.len;
5742 bool returns = true;
5743 for (; i != end; ++i) {
5744 if (!initializer_returns(*i))
5750 case INITIALIZER_STRING:
5751 case INITIALIZER_WIDE_STRING:
5752 case INITIALIZER_DESIGNATOR: // designators have no payload
5755 panic("unhandled initializer");
5758 static bool noreturn_candidate;
5760 static void check_reachable(statement_t *const stmt)
5762 if (stmt->base.reachable)
5764 if (stmt->kind != STATEMENT_DO_WHILE)
5765 stmt->base.reachable = true;
5767 statement_t *last = stmt;
5769 switch (stmt->kind) {
5770 case STATEMENT_INVALID:
5771 case STATEMENT_EMPTY:
5772 case STATEMENT_LOCAL_LABEL:
5774 next = stmt->base.next;
5777 case STATEMENT_DECLARATION: {
5778 declaration_statement_t const *const decl = &stmt->declaration;
5779 entity_t const * ent = decl->declarations_begin;
5780 entity_t const *const last = decl->declarations_end;
5782 for (;; ent = ent->base.next) {
5783 if (ent->kind == ENTITY_VARIABLE &&
5784 ent->variable.initializer != NULL &&
5785 !initializer_returns(ent->variable.initializer)) {
5792 next = stmt->base.next;
5796 case STATEMENT_COMPOUND:
5797 next = stmt->compound.statements;
5800 case STATEMENT_RETURN: {
5801 expression_t const *const val = stmt->returns.value;
5802 if (val == NULL || expression_returns(val))
5803 noreturn_candidate = false;
5807 case STATEMENT_IF: {
5808 if_statement_t const *const ifs = &stmt->ifs;
5809 expression_t const *const cond = ifs->condition;
5811 if (!expression_returns(cond))
5814 int const val = determine_truth(cond);
5817 check_reachable(ifs->true_statement);
5822 if (ifs->false_statement != NULL) {
5823 check_reachable(ifs->false_statement);
5827 next = stmt->base.next;
5831 case STATEMENT_SWITCH: {
5832 switch_statement_t const *const switchs = &stmt->switchs;
5833 expression_t const *const expr = switchs->expression;
5835 if (!expression_returns(expr))
5838 if (is_constant_expression(expr)) {
5839 long const val = fold_constant(expr);
5840 case_label_statement_t * defaults = NULL;
5841 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5842 if (i->expression == NULL) {
5847 if (i->first_case <= val && val <= i->last_case) {
5848 check_reachable((statement_t*)i);
5853 if (defaults != NULL) {
5854 check_reachable((statement_t*)defaults);
5858 bool has_default = false;
5859 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5860 if (i->expression == NULL)
5863 check_reachable((statement_t*)i);
5870 next = stmt->base.next;
5874 case STATEMENT_EXPRESSION: {
5875 /* Check for noreturn function call */
5876 expression_t const *const expr = stmt->expression.expression;
5877 if (!expression_returns(expr))
5880 next = stmt->base.next;
5884 case STATEMENT_CONTINUE: {
5885 statement_t *parent = stmt;
5887 parent = parent->base.parent;
5888 if (parent == NULL) /* continue not within loop */
5892 switch (parent->kind) {
5893 case STATEMENT_WHILE: goto continue_while;
5894 case STATEMENT_DO_WHILE: goto continue_do_while;
5895 case STATEMENT_FOR: goto continue_for;
5902 case STATEMENT_BREAK: {
5903 statement_t *parent = stmt;
5905 parent = parent->base.parent;
5906 if (parent == NULL) /* break not within loop/switch */
5909 switch (parent->kind) {
5910 case STATEMENT_SWITCH:
5911 case STATEMENT_WHILE:
5912 case STATEMENT_DO_WHILE:
5915 next = parent->base.next;
5916 goto found_break_parent;
5925 case STATEMENT_GOTO:
5926 if (stmt->gotos.expression) {
5927 if (!expression_returns(stmt->gotos.expression))
5930 statement_t *parent = stmt->base.parent;
5931 if (parent == NULL) /* top level goto */
5935 next = stmt->gotos.label->statement;
5936 if (next == NULL) /* missing label */
5941 case STATEMENT_LABEL:
5942 next = stmt->label.statement;
5945 case STATEMENT_CASE_LABEL:
5946 next = stmt->case_label.statement;
5949 case STATEMENT_WHILE: {
5950 while_statement_t const *const whiles = &stmt->whiles;
5951 expression_t const *const cond = whiles->condition;
5953 if (!expression_returns(cond))
5956 int const val = determine_truth(cond);
5959 check_reachable(whiles->body);
5964 next = stmt->base.next;
5968 case STATEMENT_DO_WHILE:
5969 next = stmt->do_while.body;
5972 case STATEMENT_FOR: {
5973 for_statement_t *const fors = &stmt->fors;
5975 if (fors->condition_reachable)
5977 fors->condition_reachable = true;
5979 expression_t const *const cond = fors->condition;
5984 } else if (expression_returns(cond)) {
5985 val = determine_truth(cond);
5991 check_reachable(fors->body);
5996 next = stmt->base.next;
6000 case STATEMENT_MS_TRY: {
6001 ms_try_statement_t const *const ms_try = &stmt->ms_try;
6002 check_reachable(ms_try->try_statement);
6003 next = ms_try->final_statement;
6007 case STATEMENT_LEAVE: {
6008 statement_t *parent = stmt;
6010 parent = parent->base.parent;
6011 if (parent == NULL) /* __leave not within __try */
6014 if (parent->kind == STATEMENT_MS_TRY) {
6016 next = parent->ms_try.final_statement;
6024 while (next == NULL) {
6025 next = last->base.parent;
6027 noreturn_candidate = false;
6029 type_t *const type = current_function->base.type;
6030 assert(is_type_function(type));
6031 type_t *const ret = skip_typeref(type->function.return_type);
6032 if (warning.return_type &&
6033 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
6034 is_type_valid(ret) &&
6035 !is_sym_main(current_function->base.base.symbol)) {
6036 warningf(&stmt->base.source_position,
6037 "control reaches end of non-void function");
6042 switch (next->kind) {
6043 case STATEMENT_INVALID:
6044 case STATEMENT_EMPTY:
6045 case STATEMENT_DECLARATION:
6046 case STATEMENT_LOCAL_LABEL:
6047 case STATEMENT_EXPRESSION:
6049 case STATEMENT_RETURN:
6050 case STATEMENT_CONTINUE:
6051 case STATEMENT_BREAK:
6052 case STATEMENT_GOTO:
6053 case STATEMENT_LEAVE:
6054 panic("invalid control flow in function");
6056 case STATEMENT_COMPOUND:
6058 case STATEMENT_SWITCH:
6059 case STATEMENT_LABEL:
6060 case STATEMENT_CASE_LABEL:
6062 next = next->base.next;
6065 case STATEMENT_WHILE: {
6067 if (next->base.reachable)
6069 next->base.reachable = true;
6071 while_statement_t const *const whiles = &next->whiles;
6072 expression_t const *const cond = whiles->condition;
6074 if (!expression_returns(cond))
6077 int const val = determine_truth(cond);
6080 check_reachable(whiles->body);
6086 next = next->base.next;
6090 case STATEMENT_DO_WHILE: {
6092 if (next->base.reachable)
6094 next->base.reachable = true;
6096 do_while_statement_t const *const dw = &next->do_while;
6097 expression_t const *const cond = dw->condition;
6099 if (!expression_returns(cond))
6102 int const val = determine_truth(cond);
6105 check_reachable(dw->body);
6111 next = next->base.next;
6115 case STATEMENT_FOR: {
6117 for_statement_t *const fors = &next->fors;
6119 fors->step_reachable = true;
6121 if (fors->condition_reachable)
6123 fors->condition_reachable = true;
6125 expression_t const *const cond = fors->condition;
6130 } else if (expression_returns(cond)) {
6131 val = determine_truth(cond);
6137 check_reachable(fors->body);
6143 next = next->base.next;
6147 case STATEMENT_MS_TRY:
6149 next = next->ms_try.final_statement;
6154 check_reachable(next);
6157 static void check_unreachable(statement_t* const stmt, void *const env)
6161 switch (stmt->kind) {
6162 case STATEMENT_DO_WHILE:
6163 if (!stmt->base.reachable) {
6164 expression_t const *const cond = stmt->do_while.condition;
6165 if (determine_truth(cond) >= 0) {
6166 warningf(&cond->base.source_position,
6167 "condition of do-while-loop is unreachable");
6172 case STATEMENT_FOR: {
6173 for_statement_t const* const fors = &stmt->fors;
6175 // if init and step are unreachable, cond is unreachable, too
6176 if (!stmt->base.reachable && !fors->step_reachable) {
6177 warningf(&stmt->base.source_position, "statement is unreachable");
6179 if (!stmt->base.reachable && fors->initialisation != NULL) {
6180 warningf(&fors->initialisation->base.source_position,
6181 "initialisation of for-statement is unreachable");
6184 if (!fors->condition_reachable && fors->condition != NULL) {
6185 warningf(&fors->condition->base.source_position,
6186 "condition of for-statement is unreachable");
6189 if (!fors->step_reachable && fors->step != NULL) {
6190 warningf(&fors->step->base.source_position,
6191 "step of for-statement is unreachable");
6197 case STATEMENT_COMPOUND:
6198 if (stmt->compound.statements != NULL)
6200 goto warn_unreachable;
6202 case STATEMENT_DECLARATION: {
6203 /* Only warn if there is at least one declarator with an initializer.
6204 * This typically occurs in switch statements. */
6205 declaration_statement_t const *const decl = &stmt->declaration;
6206 entity_t const * ent = decl->declarations_begin;
6207 entity_t const *const last = decl->declarations_end;
6208 for (;; ent = ent->base.next) {
6209 if (ent->kind == ENTITY_VARIABLE &&
6210 ent->variable.initializer != NULL) {
6211 goto warn_unreachable;
6220 if (!stmt->base.reachable)
6221 warningf(&stmt->base.source_position, "statement is unreachable");
6226 static void parse_external_declaration(void)
6228 /* function-definitions and declarations both start with declaration
6230 declaration_specifiers_t specifiers;
6231 memset(&specifiers, 0, sizeof(specifiers));
6233 add_anchor_token(';');
6234 parse_declaration_specifiers(&specifiers);
6235 rem_anchor_token(';');
6237 /* must be a declaration */
6238 if (token.type == ';') {
6239 parse_anonymous_declaration_rest(&specifiers);
6243 add_anchor_token(',');
6244 add_anchor_token('=');
6245 add_anchor_token(';');
6246 add_anchor_token('{');
6248 /* declarator is common to both function-definitions and declarations */
6249 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6251 rem_anchor_token('{');
6252 rem_anchor_token(';');
6253 rem_anchor_token('=');
6254 rem_anchor_token(',');
6256 /* must be a declaration */
6257 switch (token.type) {
6261 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6266 /* must be a function definition */
6267 parse_kr_declaration_list(ndeclaration);
6269 if (token.type != '{') {
6270 parse_error_expected("while parsing function definition", '{', NULL);
6271 eat_until_matching_token(';');
6275 assert(is_declaration(ndeclaration));
6276 type_t *type = skip_typeref(ndeclaration->declaration.type);
6278 if (!is_type_function(type)) {
6279 if (is_type_valid(type)) {
6280 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6281 type, ndeclaration->base.symbol);
6287 if (warning.aggregate_return &&
6288 is_type_compound(skip_typeref(type->function.return_type))) {
6289 warningf(HERE, "function '%Y' returns an aggregate",
6290 ndeclaration->base.symbol);
6292 if (warning.traditional && !type->function.unspecified_parameters) {
6293 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6294 ndeclaration->base.symbol);
6296 if (warning.old_style_definition && type->function.unspecified_parameters) {
6297 warningf(HERE, "old-style function definition '%Y'",
6298 ndeclaration->base.symbol);
6301 /* § 6.7.5.3 (14) a function definition with () means no
6302 * parameters (and not unspecified parameters) */
6303 if (type->function.unspecified_parameters
6304 && type->function.parameters == NULL
6305 && !type->function.kr_style_parameters) {
6306 type_t *duplicate = duplicate_type(type);
6307 duplicate->function.unspecified_parameters = false;
6309 type = typehash_insert(duplicate);
6310 if (type != duplicate) {
6311 obstack_free(type_obst, duplicate);
6313 ndeclaration->declaration.type = type;
6316 entity_t *const entity = record_entity(ndeclaration, true);
6317 assert(entity->kind == ENTITY_FUNCTION);
6318 assert(ndeclaration->kind == ENTITY_FUNCTION);
6320 function_t *function = &entity->function;
6321 if (ndeclaration != entity) {
6322 function->parameters = ndeclaration->function.parameters;
6324 assert(is_declaration(entity));
6325 type = skip_typeref(entity->declaration.type);
6327 /* push function parameters and switch scope */
6328 size_t const top = environment_top();
6329 scope_t *old_scope = scope_push(&function->parameters);
6331 entity_t *parameter = function->parameters.entities;
6332 for (; parameter != NULL; parameter = parameter->base.next) {
6333 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6334 parameter->base.parent_scope = current_scope;
6336 assert(parameter->base.parent_scope == NULL
6337 || parameter->base.parent_scope == current_scope);
6338 parameter->base.parent_scope = current_scope;
6339 if (parameter->base.symbol == NULL) {
6340 errorf(¶meter->base.source_position, "parameter name omitted");
6343 environment_push(parameter);
6346 if (function->statement != NULL) {
6347 parser_error_multiple_definition(entity, HERE);
6350 /* parse function body */
6351 int label_stack_top = label_top();
6352 function_t *old_current_function = current_function;
6353 current_function = function;
6354 current_parent = NULL;
6357 goto_anchor = &goto_first;
6359 label_anchor = &label_first;
6361 statement_t *const body = parse_compound_statement(false);
6362 function->statement = body;
6365 check_declarations();
6366 if (warning.return_type ||
6367 warning.unreachable_code ||
6368 (warning.missing_noreturn
6369 && !(function->base.modifiers & DM_NORETURN))) {
6370 noreturn_candidate = true;
6371 check_reachable(body);
6372 if (warning.unreachable_code)
6373 walk_statements(body, check_unreachable, NULL);
6374 if (warning.missing_noreturn &&
6375 noreturn_candidate &&
6376 !(function->base.modifiers & DM_NORETURN)) {
6377 warningf(&body->base.source_position,
6378 "function '%#T' is candidate for attribute 'noreturn'",
6379 type, entity->base.symbol);
6383 assert(current_parent == NULL);
6384 assert(current_function == function);
6385 current_function = old_current_function;
6386 label_pop_to(label_stack_top);
6389 assert(current_scope == &function->parameters);
6390 scope_pop(old_scope);
6391 environment_pop_to(top);
6394 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6395 source_position_t *source_position,
6396 const symbol_t *symbol)
6398 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6400 type->bitfield.base_type = base_type;
6401 type->bitfield.size_expression = size;
6404 type_t *skipped_type = skip_typeref(base_type);
6405 if (!is_type_integer(skipped_type)) {
6406 errorf(HERE, "bitfield base type '%T' is not an integer type",
6410 bit_size = skipped_type->base.size * 8;
6413 if (is_constant_expression(size)) {
6414 long v = fold_constant(size);
6417 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6418 } else if (v == 0) {
6419 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6420 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6421 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6423 type->bitfield.bit_size = v;
6430 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6432 entity_t *iter = compound->members.entities;
6433 for (; iter != NULL; iter = iter->base.next) {
6434 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6437 if (iter->base.symbol == symbol) {
6439 } else if (iter->base.symbol == NULL) {
6440 type_t *type = skip_typeref(iter->declaration.type);
6441 if (is_type_compound(type)) {
6443 = find_compound_entry(type->compound.compound, symbol);
6454 static void parse_compound_declarators(compound_t *compound,
6455 const declaration_specifiers_t *specifiers)
6460 if (token.type == ':') {
6461 source_position_t source_position = *HERE;
6464 type_t *base_type = specifiers->type;
6465 expression_t *size = parse_constant_expression();
6467 type_t *type = make_bitfield_type(base_type, size,
6468 &source_position, sym_anonymous);
6470 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6471 entity->base.namespc = NAMESPACE_NORMAL;
6472 entity->base.source_position = source_position;
6473 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6474 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6475 entity->declaration.modifiers = specifiers->modifiers;
6476 entity->declaration.type = type;
6478 entity = parse_declarator(specifiers,
6479 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6480 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6482 if (token.type == ':') {
6483 source_position_t source_position = *HERE;
6485 expression_t *size = parse_constant_expression();
6487 type_t *type = entity->declaration.type;
6488 type_t *bitfield_type = make_bitfield_type(type, size,
6489 &source_position, entity->base.symbol);
6490 entity->declaration.type = bitfield_type;
6494 /* make sure we don't define a symbol multiple times */
6495 symbol_t *symbol = entity->base.symbol;
6496 if (symbol != NULL) {
6497 entity_t *prev = find_compound_entry(compound, symbol);
6500 errorf(&entity->base.source_position,
6501 "multiple declarations of symbol '%Y' (declared %P)",
6502 symbol, &prev->base.source_position);
6506 append_entity(&compound->members, entity);
6508 type_t *orig_type = entity->declaration.type;
6509 type_t *type = skip_typeref(orig_type);
6510 if (is_type_function(type)) {
6511 errorf(&entity->base.source_position,
6512 "compound member '%Y' must not have function type '%T'",
6513 entity->base.symbol, orig_type);
6514 } else if (is_type_incomplete(type)) {
6515 /* §6.7.2.1:16 flexible array member */
6516 if (is_type_array(type) &&
6517 token.type == ';' &&
6518 look_ahead(1)->type == '}') {
6519 compound->has_flexible_member = true;
6521 errorf(&entity->base.source_position,
6522 "compound member '%Y' has incomplete type '%T'",
6523 entity->base.symbol, orig_type);
6527 if (token.type != ',')
6534 anonymous_entity = NULL;
6537 static void parse_compound_type_entries(compound_t *compound)
6540 add_anchor_token('}');
6542 while (token.type != '}') {
6543 if (token.type == T_EOF) {
6544 errorf(HERE, "EOF while parsing struct");
6547 declaration_specifiers_t specifiers;
6548 memset(&specifiers, 0, sizeof(specifiers));
6549 parse_declaration_specifiers(&specifiers);
6551 parse_compound_declarators(compound, &specifiers);
6553 rem_anchor_token('}');
6557 compound->complete = true;
6560 static type_t *parse_typename(void)
6562 declaration_specifiers_t specifiers;
6563 memset(&specifiers, 0, sizeof(specifiers));
6564 parse_declaration_specifiers(&specifiers);
6565 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6566 specifiers.thread_local) {
6567 /* TODO: improve error message, user does probably not know what a
6568 * storage class is...
6570 errorf(HERE, "typename may not have a storage class");
6573 type_t *result = parse_abstract_declarator(specifiers.type);
6581 typedef expression_t* (*parse_expression_function)(void);
6582 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6584 typedef struct expression_parser_function_t expression_parser_function_t;
6585 struct expression_parser_function_t {
6586 parse_expression_function parser;
6587 unsigned infix_precedence;
6588 parse_expression_infix_function infix_parser;
6591 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6594 * Prints an error message if an expression was expected but not read
6596 static expression_t *expected_expression_error(void)
6598 /* skip the error message if the error token was read */
6599 if (token.type != T_ERROR) {
6600 errorf(HERE, "expected expression, got token %K", &token);
6604 return create_invalid_expression();
6608 * Parse a string constant.
6610 static expression_t *parse_string_const(void)
6613 if (token.type == T_STRING_LITERAL) {
6614 string_t res = token.v.string;
6616 while (token.type == T_STRING_LITERAL) {
6617 res = concat_strings(&res, &token.v.string);
6620 if (token.type != T_WIDE_STRING_LITERAL) {
6621 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6622 /* note: that we use type_char_ptr here, which is already the
6623 * automatic converted type. revert_automatic_type_conversion
6624 * will construct the array type */
6625 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6626 cnst->string.value = res;
6630 wres = concat_string_wide_string(&res, &token.v.wide_string);
6632 wres = token.v.wide_string;
6637 switch (token.type) {
6638 case T_WIDE_STRING_LITERAL:
6639 wres = concat_wide_strings(&wres, &token.v.wide_string);
6642 case T_STRING_LITERAL:
6643 wres = concat_wide_string_string(&wres, &token.v.string);
6647 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6648 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6649 cnst->wide_string.value = wres;
6658 * Parse a boolean constant.
6660 static expression_t *parse_bool_const(bool value)
6662 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6663 cnst->base.type = type_bool;
6664 cnst->conste.v.int_value = value;
6672 * Parse an integer constant.
6674 static expression_t *parse_int_const(void)
6676 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6677 cnst->base.type = token.datatype;
6678 cnst->conste.v.int_value = token.v.intvalue;
6686 * Parse a character constant.
6688 static expression_t *parse_character_constant(void)
6690 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6691 cnst->base.type = token.datatype;
6692 cnst->conste.v.character = token.v.string;
6694 if (cnst->conste.v.character.size != 1) {
6696 errorf(HERE, "more than 1 character in character constant");
6697 } else if (warning.multichar) {
6698 warningf(HERE, "multi-character character constant");
6707 * Parse a wide character constant.
6709 static expression_t *parse_wide_character_constant(void)
6711 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6712 cnst->base.type = token.datatype;
6713 cnst->conste.v.wide_character = token.v.wide_string;
6715 if (cnst->conste.v.wide_character.size != 1) {
6717 errorf(HERE, "more than 1 character in character constant");
6718 } else if (warning.multichar) {
6719 warningf(HERE, "multi-character character constant");
6728 * Parse a float constant.
6730 static expression_t *parse_float_const(void)
6732 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6733 cnst->base.type = token.datatype;
6734 cnst->conste.v.float_value = token.v.floatvalue;
6741 static entity_t *create_implicit_function(symbol_t *symbol,
6742 const source_position_t *source_position)
6744 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6745 ntype->function.return_type = type_int;
6746 ntype->function.unspecified_parameters = true;
6748 type_t *type = typehash_insert(ntype);
6749 if (type != ntype) {
6753 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6754 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6755 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6756 entity->declaration.type = type;
6757 entity->declaration.implicit = true;
6758 entity->base.symbol = symbol;
6759 entity->base.source_position = *source_position;
6761 bool strict_prototypes_old = warning.strict_prototypes;
6762 warning.strict_prototypes = false;
6763 record_entity(entity, false);
6764 warning.strict_prototypes = strict_prototypes_old;
6770 * Creates a return_type (func)(argument_type) function type if not
6773 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6774 type_t *argument_type2)
6776 function_parameter_t *parameter2
6777 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6778 memset(parameter2, 0, sizeof(parameter2[0]));
6779 parameter2->type = argument_type2;
6781 function_parameter_t *parameter1
6782 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6783 memset(parameter1, 0, sizeof(parameter1[0]));
6784 parameter1->type = argument_type1;
6785 parameter1->next = parameter2;
6787 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6788 type->function.return_type = return_type;
6789 type->function.parameters = parameter1;
6791 type_t *result = typehash_insert(type);
6792 if (result != type) {
6800 * Creates a return_type (func)(argument_type) function type if not
6803 * @param return_type the return type
6804 * @param argument_type the argument type
6806 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6808 function_parameter_t *parameter
6809 = obstack_alloc(type_obst, sizeof(parameter[0]));
6810 memset(parameter, 0, sizeof(parameter[0]));
6811 parameter->type = argument_type;
6813 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6814 type->function.return_type = return_type;
6815 type->function.parameters = parameter;
6817 type_t *result = typehash_insert(type);
6818 if (result != type) {
6825 static type_t *make_function_0_type(type_t *return_type)
6827 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6828 type->function.return_type = return_type;
6829 type->function.parameters = NULL;
6831 type_t *result = typehash_insert(type);
6832 if (result != type) {
6840 * Creates a function type for some function like builtins.
6842 * @param symbol the symbol describing the builtin
6844 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6846 switch (symbol->ID) {
6847 case T___builtin_alloca:
6848 return make_function_1_type(type_void_ptr, type_size_t);
6849 case T___builtin_huge_val:
6850 return make_function_0_type(type_double);
6851 case T___builtin_inf:
6852 return make_function_0_type(type_double);
6853 case T___builtin_inff:
6854 return make_function_0_type(type_float);
6855 case T___builtin_infl:
6856 return make_function_0_type(type_long_double);
6857 case T___builtin_nan:
6858 return make_function_1_type(type_double, type_char_ptr);
6859 case T___builtin_nanf:
6860 return make_function_1_type(type_float, type_char_ptr);
6861 case T___builtin_nanl:
6862 return make_function_1_type(type_long_double, type_char_ptr);
6863 case T___builtin_va_end:
6864 return make_function_1_type(type_void, type_valist);
6865 case T___builtin_expect:
6866 return make_function_2_type(type_long, type_long, type_long);
6868 internal_errorf(HERE, "not implemented builtin symbol found");
6873 * Performs automatic type cast as described in § 6.3.2.1.
6875 * @param orig_type the original type
6877 static type_t *automatic_type_conversion(type_t *orig_type)
6879 type_t *type = skip_typeref(orig_type);
6880 if (is_type_array(type)) {
6881 array_type_t *array_type = &type->array;
6882 type_t *element_type = array_type->element_type;
6883 unsigned qualifiers = array_type->base.qualifiers;
6885 return make_pointer_type(element_type, qualifiers);
6888 if (is_type_function(type)) {
6889 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6896 * reverts the automatic casts of array to pointer types and function
6897 * to function-pointer types as defined § 6.3.2.1
6899 type_t *revert_automatic_type_conversion(const expression_t *expression)
6901 switch (expression->kind) {
6902 case EXPR_REFERENCE: {
6903 entity_t *entity = expression->reference.entity;
6904 if (is_declaration(entity)) {
6905 return entity->declaration.type;
6906 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6907 return entity->enum_value.enum_type;
6909 panic("no declaration or enum in reference");
6914 entity_t *entity = expression->select.compound_entry;
6915 assert(is_declaration(entity));
6916 type_t *type = entity->declaration.type;
6917 return get_qualified_type(type,
6918 expression->base.type->base.qualifiers);
6921 case EXPR_UNARY_DEREFERENCE: {
6922 const expression_t *const value = expression->unary.value;
6923 type_t *const type = skip_typeref(value->base.type);
6924 assert(is_type_pointer(type));
6925 return type->pointer.points_to;
6928 case EXPR_BUILTIN_SYMBOL:
6929 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6931 case EXPR_ARRAY_ACCESS: {
6932 const expression_t *array_ref = expression->array_access.array_ref;
6933 type_t *type_left = skip_typeref(array_ref->base.type);
6934 if (!is_type_valid(type_left))
6936 assert(is_type_pointer(type_left));
6937 return type_left->pointer.points_to;
6940 case EXPR_STRING_LITERAL: {
6941 size_t size = expression->string.value.size;
6942 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6945 case EXPR_WIDE_STRING_LITERAL: {
6946 size_t size = expression->wide_string.value.size;
6947 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6950 case EXPR_COMPOUND_LITERAL:
6951 return expression->compound_literal.type;
6956 return expression->base.type;
6959 static expression_t *parse_reference(void)
6961 symbol_t *const symbol = token.v.symbol;
6963 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6965 if (entity == NULL) {
6966 if (!strict_mode && look_ahead(1)->type == '(') {
6967 /* an implicitly declared function */
6968 if (warning.error_implicit_function_declaration) {
6969 errorf(HERE, "implicit declaration of function '%Y'", symbol);
6970 } else if (warning.implicit_function_declaration) {
6971 warningf(HERE, "implicit declaration of function '%Y'", symbol);
6974 entity = create_implicit_function(symbol, HERE);
6976 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6977 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6983 if (is_declaration(entity)) {
6984 orig_type = entity->declaration.type;
6985 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6986 orig_type = entity->enum_value.enum_type;
6987 } else if (entity->kind == ENTITY_TYPEDEF) {
6988 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
6991 return create_invalid_expression();
6993 panic("expected declaration or enum value in reference");
6996 /* we always do the auto-type conversions; the & and sizeof parser contains
6997 * code to revert this! */
6998 type_t *type = automatic_type_conversion(orig_type);
7000 expression_kind_t kind = EXPR_REFERENCE;
7001 if (entity->kind == ENTITY_ENUM_VALUE)
7002 kind = EXPR_REFERENCE_ENUM_VALUE;
7004 expression_t *expression = allocate_expression_zero(kind);
7005 expression->reference.entity = entity;
7006 expression->base.type = type;
7008 /* this declaration is used */
7009 if (is_declaration(entity)) {
7010 entity->declaration.used = true;
7013 if (entity->base.parent_scope != file_scope
7014 && entity->base.parent_scope->depth < current_function->parameters.depth
7015 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
7016 if (entity->kind == ENTITY_VARIABLE) {
7017 /* access of a variable from an outer function */
7018 entity->variable.address_taken = true;
7019 } else if (entity->kind == ENTITY_PARAMETER) {
7020 entity->parameter.address_taken = true;
7022 current_function->need_closure = true;
7025 /* check for deprecated functions */
7026 if (warning.deprecated_declarations
7027 && is_declaration(entity)
7028 && entity->declaration.modifiers & DM_DEPRECATED) {
7029 declaration_t *declaration = &entity->declaration;
7031 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
7032 "function" : "variable";
7034 if (declaration->deprecated_string != NULL) {
7035 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
7036 prefix, entity->base.symbol, &entity->base.source_position,
7037 declaration->deprecated_string);
7039 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
7040 entity->base.symbol, &entity->base.source_position);
7044 if (warning.init_self && entity == current_init_decl && !in_type_prop
7045 && entity->kind == ENTITY_VARIABLE) {
7046 current_init_decl = NULL;
7047 warningf(HERE, "variable '%#T' is initialized by itself",
7048 entity->declaration.type, entity->base.symbol);
7055 static bool semantic_cast(expression_t *cast)
7057 expression_t *expression = cast->unary.value;
7058 type_t *orig_dest_type = cast->base.type;
7059 type_t *orig_type_right = expression->base.type;
7060 type_t const *dst_type = skip_typeref(orig_dest_type);
7061 type_t const *src_type = skip_typeref(orig_type_right);
7062 source_position_t const *pos = &cast->base.source_position;
7064 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7065 if (dst_type == type_void)
7068 /* only integer and pointer can be casted to pointer */
7069 if (is_type_pointer(dst_type) &&
7070 !is_type_pointer(src_type) &&
7071 !is_type_integer(src_type) &&
7072 is_type_valid(src_type)) {
7073 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7077 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7078 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7082 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7083 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7087 if (warning.cast_qual &&
7088 is_type_pointer(src_type) &&
7089 is_type_pointer(dst_type)) {
7090 type_t *src = skip_typeref(src_type->pointer.points_to);
7091 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7092 unsigned missing_qualifiers =
7093 src->base.qualifiers & ~dst->base.qualifiers;
7094 if (missing_qualifiers != 0) {
7096 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7097 missing_qualifiers, orig_type_right);
7103 static expression_t *parse_compound_literal(type_t *type)
7105 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7107 parse_initializer_env_t env;
7110 env.must_be_constant = false;
7111 initializer_t *initializer = parse_initializer(&env);
7114 expression->compound_literal.initializer = initializer;
7115 expression->compound_literal.type = type;
7116 expression->base.type = automatic_type_conversion(type);
7122 * Parse a cast expression.
7124 static expression_t *parse_cast(void)
7126 add_anchor_token(')');
7128 source_position_t source_position = token.source_position;
7130 type_t *type = parse_typename();
7132 rem_anchor_token(')');
7135 if (token.type == '{') {
7136 return parse_compound_literal(type);
7139 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7140 cast->base.source_position = source_position;
7142 expression_t *value = parse_sub_expression(PREC_CAST);
7143 cast->base.type = type;
7144 cast->unary.value = value;
7146 if (! semantic_cast(cast)) {
7147 /* TODO: record the error in the AST. else it is impossible to detect it */
7152 return create_invalid_expression();
7156 * Parse a statement expression.
7158 static expression_t *parse_statement_expression(void)
7160 add_anchor_token(')');
7162 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7164 statement_t *statement = parse_compound_statement(true);
7165 expression->statement.statement = statement;
7167 /* find last statement and use its type */
7168 type_t *type = type_void;
7169 const statement_t *stmt = statement->compound.statements;
7171 while (stmt->base.next != NULL)
7172 stmt = stmt->base.next;
7174 if (stmt->kind == STATEMENT_EXPRESSION) {
7175 type = stmt->expression.expression->base.type;
7177 } else if (warning.other) {
7178 warningf(&expression->base.source_position, "empty statement expression ({})");
7180 expression->base.type = type;
7182 rem_anchor_token(')');
7190 * Parse a parenthesized expression.
7192 static expression_t *parse_parenthesized_expression(void)
7196 switch (token.type) {
7198 /* gcc extension: a statement expression */
7199 return parse_statement_expression();
7203 return parse_cast();
7205 if (is_typedef_symbol(token.v.symbol)) {
7206 return parse_cast();
7210 add_anchor_token(')');
7211 expression_t *result = parse_expression();
7212 rem_anchor_token(')');
7219 static expression_t *parse_function_keyword(void)
7223 if (current_function == NULL) {
7224 errorf(HERE, "'__func__' used outside of a function");
7227 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7228 expression->base.type = type_char_ptr;
7229 expression->funcname.kind = FUNCNAME_FUNCTION;
7236 static expression_t *parse_pretty_function_keyword(void)
7238 if (current_function == NULL) {
7239 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7242 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7243 expression->base.type = type_char_ptr;
7244 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7246 eat(T___PRETTY_FUNCTION__);
7251 static expression_t *parse_funcsig_keyword(void)
7253 if (current_function == NULL) {
7254 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7257 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7258 expression->base.type = type_char_ptr;
7259 expression->funcname.kind = FUNCNAME_FUNCSIG;
7266 static expression_t *parse_funcdname_keyword(void)
7268 if (current_function == NULL) {
7269 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7272 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7273 expression->base.type = type_char_ptr;
7274 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7276 eat(T___FUNCDNAME__);
7281 static designator_t *parse_designator(void)
7283 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7284 result->source_position = *HERE;
7286 if (token.type != T_IDENTIFIER) {
7287 parse_error_expected("while parsing member designator",
7288 T_IDENTIFIER, NULL);
7291 result->symbol = token.v.symbol;
7294 designator_t *last_designator = result;
7296 if (token.type == '.') {
7298 if (token.type != T_IDENTIFIER) {
7299 parse_error_expected("while parsing member designator",
7300 T_IDENTIFIER, NULL);
7303 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7304 designator->source_position = *HERE;
7305 designator->symbol = token.v.symbol;
7308 last_designator->next = designator;
7309 last_designator = designator;
7312 if (token.type == '[') {
7314 add_anchor_token(']');
7315 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7316 designator->source_position = *HERE;
7317 designator->array_index = parse_expression();
7318 rem_anchor_token(']');
7320 if (designator->array_index == NULL) {
7324 last_designator->next = designator;
7325 last_designator = designator;
7337 * Parse the __builtin_offsetof() expression.
7339 static expression_t *parse_offsetof(void)
7341 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7342 expression->base.type = type_size_t;
7344 eat(T___builtin_offsetof);
7347 add_anchor_token(',');
7348 type_t *type = parse_typename();
7349 rem_anchor_token(',');
7351 add_anchor_token(')');
7352 designator_t *designator = parse_designator();
7353 rem_anchor_token(')');
7356 expression->offsetofe.type = type;
7357 expression->offsetofe.designator = designator;
7360 memset(&path, 0, sizeof(path));
7361 path.top_type = type;
7362 path.path = NEW_ARR_F(type_path_entry_t, 0);
7364 descend_into_subtype(&path);
7366 if (!walk_designator(&path, designator, true)) {
7367 return create_invalid_expression();
7370 DEL_ARR_F(path.path);
7374 return create_invalid_expression();
7378 * Parses a _builtin_va_start() expression.
7380 static expression_t *parse_va_start(void)
7382 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7384 eat(T___builtin_va_start);
7387 add_anchor_token(',');
7388 expression->va_starte.ap = parse_assignment_expression();
7389 rem_anchor_token(',');
7391 expression_t *const expr = parse_assignment_expression();
7392 if (expr->kind == EXPR_REFERENCE) {
7393 entity_t *const entity = expr->reference.entity;
7394 if (entity->base.parent_scope != ¤t_function->parameters
7395 || entity->base.next != NULL
7396 || entity->kind != ENTITY_PARAMETER) {
7397 errorf(&expr->base.source_position,
7398 "second argument of 'va_start' must be last parameter of the current function");
7400 expression->va_starte.parameter = &entity->variable;
7407 return create_invalid_expression();
7411 * Parses a _builtin_va_arg() expression.
7413 static expression_t *parse_va_arg(void)
7415 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7417 eat(T___builtin_va_arg);
7420 expression->va_arge.ap = parse_assignment_expression();
7422 expression->base.type = parse_typename();
7427 return create_invalid_expression();
7430 static expression_t *parse_builtin_symbol(void)
7432 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7434 symbol_t *symbol = token.v.symbol;
7436 expression->builtin_symbol.symbol = symbol;
7439 type_t *type = get_builtin_symbol_type(symbol);
7440 type = automatic_type_conversion(type);
7442 expression->base.type = type;
7447 * Parses a __builtin_constant() expression.
7449 static expression_t *parse_builtin_constant(void)
7451 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7453 eat(T___builtin_constant_p);
7456 add_anchor_token(')');
7457 expression->builtin_constant.value = parse_assignment_expression();
7458 rem_anchor_token(')');
7460 expression->base.type = type_int;
7464 return create_invalid_expression();
7468 * Parses a __builtin_prefetch() expression.
7470 static expression_t *parse_builtin_prefetch(void)
7472 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7474 eat(T___builtin_prefetch);
7477 add_anchor_token(')');
7478 expression->builtin_prefetch.adr = parse_assignment_expression();
7479 if (token.type == ',') {
7481 expression->builtin_prefetch.rw = parse_assignment_expression();
7483 if (token.type == ',') {
7485 expression->builtin_prefetch.locality = parse_assignment_expression();
7487 rem_anchor_token(')');
7489 expression->base.type = type_void;
7493 return create_invalid_expression();
7497 * Parses a __builtin_is_*() compare expression.
7499 static expression_t *parse_compare_builtin(void)
7501 expression_t *expression;
7503 switch (token.type) {
7504 case T___builtin_isgreater:
7505 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7507 case T___builtin_isgreaterequal:
7508 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7510 case T___builtin_isless:
7511 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7513 case T___builtin_islessequal:
7514 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7516 case T___builtin_islessgreater:
7517 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7519 case T___builtin_isunordered:
7520 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7523 internal_errorf(HERE, "invalid compare builtin found");
7525 expression->base.source_position = *HERE;
7529 expression->binary.left = parse_assignment_expression();
7531 expression->binary.right = parse_assignment_expression();
7534 type_t *const orig_type_left = expression->binary.left->base.type;
7535 type_t *const orig_type_right = expression->binary.right->base.type;
7537 type_t *const type_left = skip_typeref(orig_type_left);
7538 type_t *const type_right = skip_typeref(orig_type_right);
7539 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7540 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7541 type_error_incompatible("invalid operands in comparison",
7542 &expression->base.source_position, orig_type_left, orig_type_right);
7545 semantic_comparison(&expression->binary);
7550 return create_invalid_expression();
7555 * Parses a __builtin_expect() expression.
7557 static expression_t *parse_builtin_expect(void)
7559 expression_t *expression
7560 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7562 eat(T___builtin_expect);
7565 expression->binary.left = parse_assignment_expression();
7567 expression->binary.right = parse_constant_expression();
7570 expression->base.type = expression->binary.left->base.type;
7574 return create_invalid_expression();
7579 * Parses a MS assume() expression.
7581 static expression_t *parse_assume(void)
7583 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7588 add_anchor_token(')');
7589 expression->unary.value = parse_assignment_expression();
7590 rem_anchor_token(')');
7593 expression->base.type = type_void;
7596 return create_invalid_expression();
7600 * Return the declaration for a given label symbol or create a new one.
7602 * @param symbol the symbol of the label
7604 static label_t *get_label(symbol_t *symbol)
7607 assert(current_function != NULL);
7609 label = get_entity(symbol, NAMESPACE_LABEL);
7610 /* if we found a local label, we already created the declaration */
7611 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7612 if (label->base.parent_scope != current_scope) {
7613 assert(label->base.parent_scope->depth < current_scope->depth);
7614 current_function->goto_to_outer = true;
7616 return &label->label;
7619 label = get_entity(symbol, NAMESPACE_LABEL);
7620 /* if we found a label in the same function, then we already created the
7623 && label->base.parent_scope == ¤t_function->parameters) {
7624 return &label->label;
7627 /* otherwise we need to create a new one */
7628 label = allocate_entity_zero(ENTITY_LABEL);
7629 label->base.namespc = NAMESPACE_LABEL;
7630 label->base.symbol = symbol;
7634 return &label->label;
7638 * Parses a GNU && label address expression.
7640 static expression_t *parse_label_address(void)
7642 source_position_t source_position = token.source_position;
7644 if (token.type != T_IDENTIFIER) {
7645 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7648 symbol_t *symbol = token.v.symbol;
7651 label_t *label = get_label(symbol);
7653 label->address_taken = true;
7655 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7656 expression->base.source_position = source_position;
7658 /* label address is threaten as a void pointer */
7659 expression->base.type = type_void_ptr;
7660 expression->label_address.label = label;
7663 return create_invalid_expression();
7667 * Parse a microsoft __noop expression.
7669 static expression_t *parse_noop_expression(void)
7671 /* the result is a (int)0 */
7672 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7673 cnst->base.type = type_int;
7674 cnst->conste.v.int_value = 0;
7675 cnst->conste.is_ms_noop = true;
7679 if (token.type == '(') {
7680 /* parse arguments */
7682 add_anchor_token(')');
7683 add_anchor_token(',');
7685 if (token.type != ')') {
7687 (void)parse_assignment_expression();
7688 if (token.type != ',')
7694 rem_anchor_token(',');
7695 rem_anchor_token(')');
7703 * Parses a primary expression.
7705 static expression_t *parse_primary_expression(void)
7707 switch (token.type) {
7708 case T_false: return parse_bool_const(false);
7709 case T_true: return parse_bool_const(true);
7710 case T_INTEGER: return parse_int_const();
7711 case T_CHARACTER_CONSTANT: return parse_character_constant();
7712 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7713 case T_FLOATINGPOINT: return parse_float_const();
7714 case T_STRING_LITERAL:
7715 case T_WIDE_STRING_LITERAL: return parse_string_const();
7716 case T_IDENTIFIER: return parse_reference();
7717 case T___FUNCTION__:
7718 case T___func__: return parse_function_keyword();
7719 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7720 case T___FUNCSIG__: return parse_funcsig_keyword();
7721 case T___FUNCDNAME__: return parse_funcdname_keyword();
7722 case T___builtin_offsetof: return parse_offsetof();
7723 case T___builtin_va_start: return parse_va_start();
7724 case T___builtin_va_arg: return parse_va_arg();
7725 case T___builtin_expect:
7726 case T___builtin_alloca:
7727 case T___builtin_inf:
7728 case T___builtin_inff:
7729 case T___builtin_infl:
7730 case T___builtin_nan:
7731 case T___builtin_nanf:
7732 case T___builtin_nanl:
7733 case T___builtin_huge_val:
7734 case T___builtin_va_end: return parse_builtin_symbol();
7735 case T___builtin_isgreater:
7736 case T___builtin_isgreaterequal:
7737 case T___builtin_isless:
7738 case T___builtin_islessequal:
7739 case T___builtin_islessgreater:
7740 case T___builtin_isunordered: return parse_compare_builtin();
7741 case T___builtin_constant_p: return parse_builtin_constant();
7742 case T___builtin_prefetch: return parse_builtin_prefetch();
7743 case T__assume: return parse_assume();
7746 return parse_label_address();
7749 case '(': return parse_parenthesized_expression();
7750 case T___noop: return parse_noop_expression();
7753 errorf(HERE, "unexpected token %K, expected an expression", &token);
7754 return create_invalid_expression();
7758 * Check if the expression has the character type and issue a warning then.
7760 static void check_for_char_index_type(const expression_t *expression)
7762 type_t *const type = expression->base.type;
7763 const type_t *const base_type = skip_typeref(type);
7765 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7766 warning.char_subscripts) {
7767 warningf(&expression->base.source_position,
7768 "array subscript has type '%T'", type);
7772 static expression_t *parse_array_expression(expression_t *left)
7774 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7777 add_anchor_token(']');
7779 expression_t *inside = parse_expression();
7781 type_t *const orig_type_left = left->base.type;
7782 type_t *const orig_type_inside = inside->base.type;
7784 type_t *const type_left = skip_typeref(orig_type_left);
7785 type_t *const type_inside = skip_typeref(orig_type_inside);
7787 type_t *return_type;
7788 array_access_expression_t *array_access = &expression->array_access;
7789 if (is_type_pointer(type_left)) {
7790 return_type = type_left->pointer.points_to;
7791 array_access->array_ref = left;
7792 array_access->index = inside;
7793 check_for_char_index_type(inside);
7794 } else if (is_type_pointer(type_inside)) {
7795 return_type = type_inside->pointer.points_to;
7796 array_access->array_ref = inside;
7797 array_access->index = left;
7798 array_access->flipped = true;
7799 check_for_char_index_type(left);
7801 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7803 "array access on object with non-pointer types '%T', '%T'",
7804 orig_type_left, orig_type_inside);
7806 return_type = type_error_type;
7807 array_access->array_ref = left;
7808 array_access->index = inside;
7811 expression->base.type = automatic_type_conversion(return_type);
7813 rem_anchor_token(']');
7819 static expression_t *parse_typeprop(expression_kind_t const kind)
7821 expression_t *tp_expression = allocate_expression_zero(kind);
7822 tp_expression->base.type = type_size_t;
7824 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7826 /* we only refer to a type property, mark this case */
7827 bool old = in_type_prop;
7828 in_type_prop = true;
7831 expression_t *expression;
7832 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7834 add_anchor_token(')');
7835 orig_type = parse_typename();
7836 rem_anchor_token(')');
7839 if (token.type == '{') {
7840 /* It was not sizeof(type) after all. It is sizeof of an expression
7841 * starting with a compound literal */
7842 expression = parse_compound_literal(orig_type);
7843 goto typeprop_expression;
7846 expression = parse_sub_expression(PREC_UNARY);
7848 typeprop_expression:
7849 tp_expression->typeprop.tp_expression = expression;
7851 orig_type = revert_automatic_type_conversion(expression);
7852 expression->base.type = orig_type;
7855 tp_expression->typeprop.type = orig_type;
7856 type_t const* const type = skip_typeref(orig_type);
7857 char const* const wrong_type =
7858 is_type_incomplete(type) ? "incomplete" :
7859 type->kind == TYPE_FUNCTION ? "function designator" :
7860 type->kind == TYPE_BITFIELD ? "bitfield" :
7862 if (wrong_type != NULL) {
7863 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7864 errorf(&tp_expression->base.source_position,
7865 "operand of %s expression must not be of %s type '%T'",
7866 what, wrong_type, orig_type);
7871 return tp_expression;
7874 static expression_t *parse_sizeof(void)
7876 return parse_typeprop(EXPR_SIZEOF);
7879 static expression_t *parse_alignof(void)
7881 return parse_typeprop(EXPR_ALIGNOF);
7884 static expression_t *parse_select_expression(expression_t *compound)
7886 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7887 select->select.compound = compound;
7889 assert(token.type == '.' || token.type == T_MINUSGREATER);
7890 bool is_pointer = (token.type == T_MINUSGREATER);
7893 if (token.type != T_IDENTIFIER) {
7894 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7897 symbol_t *symbol = token.v.symbol;
7900 type_t *const orig_type = compound->base.type;
7901 type_t *const type = skip_typeref(orig_type);
7904 bool saw_error = false;
7905 if (is_type_pointer(type)) {
7908 "request for member '%Y' in something not a struct or union, but '%T'",
7912 type_left = skip_typeref(type->pointer.points_to);
7914 if (is_pointer && is_type_valid(type)) {
7915 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7922 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7923 type_left->kind == TYPE_COMPOUND_UNION) {
7924 compound_t *compound = type_left->compound.compound;
7926 if (!compound->complete) {
7927 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7929 goto create_error_entry;
7932 entry = find_compound_entry(compound, symbol);
7933 if (entry == NULL) {
7934 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7935 goto create_error_entry;
7938 if (is_type_valid(type_left) && !saw_error) {
7940 "request for member '%Y' in something not a struct or union, but '%T'",
7944 return create_invalid_expression();
7947 assert(is_declaration(entry));
7948 select->select.compound_entry = entry;
7950 type_t *entry_type = entry->declaration.type;
7952 = get_qualified_type(entry_type, type_left->base.qualifiers);
7954 /* we always do the auto-type conversions; the & and sizeof parser contains
7955 * code to revert this! */
7956 select->base.type = automatic_type_conversion(res_type);
7958 type_t *skipped = skip_typeref(res_type);
7959 if (skipped->kind == TYPE_BITFIELD) {
7960 select->base.type = skipped->bitfield.base_type;
7966 static void check_call_argument(const function_parameter_t *parameter,
7967 call_argument_t *argument, unsigned pos)
7969 type_t *expected_type = parameter->type;
7970 type_t *expected_type_skip = skip_typeref(expected_type);
7971 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7972 expression_t *arg_expr = argument->expression;
7973 type_t *arg_type = skip_typeref(arg_expr->base.type);
7975 /* handle transparent union gnu extension */
7976 if (is_type_union(expected_type_skip)
7977 && (expected_type_skip->base.modifiers
7978 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7979 compound_t *union_decl = expected_type_skip->compound.compound;
7980 type_t *best_type = NULL;
7981 entity_t *entry = union_decl->members.entities;
7982 for ( ; entry != NULL; entry = entry->base.next) {
7983 assert(is_declaration(entry));
7984 type_t *decl_type = entry->declaration.type;
7985 error = semantic_assign(decl_type, arg_expr);
7986 if (error == ASSIGN_ERROR_INCOMPATIBLE
7987 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7990 if (error == ASSIGN_SUCCESS) {
7991 best_type = decl_type;
7992 } else if (best_type == NULL) {
7993 best_type = decl_type;
7997 if (best_type != NULL) {
7998 expected_type = best_type;
8002 error = semantic_assign(expected_type, arg_expr);
8003 argument->expression = create_implicit_cast(argument->expression,
8006 if (error != ASSIGN_SUCCESS) {
8007 /* report exact scope in error messages (like "in argument 3") */
8009 snprintf(buf, sizeof(buf), "call argument %u", pos);
8010 report_assign_error(error, expected_type, arg_expr, buf,
8011 &arg_expr->base.source_position);
8012 } else if (warning.traditional || warning.conversion) {
8013 type_t *const promoted_type = get_default_promoted_type(arg_type);
8014 if (!types_compatible(expected_type_skip, promoted_type) &&
8015 !types_compatible(expected_type_skip, type_void_ptr) &&
8016 !types_compatible(type_void_ptr, promoted_type)) {
8017 /* Deliberately show the skipped types in this warning */
8018 warningf(&arg_expr->base.source_position,
8019 "passing call argument %u as '%T' rather than '%T' due to prototype",
8020 pos, expected_type_skip, promoted_type);
8026 * Parse a call expression, ie. expression '( ... )'.
8028 * @param expression the function address
8030 static expression_t *parse_call_expression(expression_t *expression)
8032 expression_t *result = allocate_expression_zero(EXPR_CALL);
8033 call_expression_t *call = &result->call;
8034 call->function = expression;
8036 type_t *const orig_type = expression->base.type;
8037 type_t *const type = skip_typeref(orig_type);
8039 function_type_t *function_type = NULL;
8040 if (is_type_pointer(type)) {
8041 type_t *const to_type = skip_typeref(type->pointer.points_to);
8043 if (is_type_function(to_type)) {
8044 function_type = &to_type->function;
8045 call->base.type = function_type->return_type;
8049 if (function_type == NULL && is_type_valid(type)) {
8050 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
8053 /* parse arguments */
8055 add_anchor_token(')');
8056 add_anchor_token(',');
8058 if (token.type != ')') {
8059 call_argument_t *last_argument = NULL;
8062 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8064 argument->expression = parse_assignment_expression();
8065 if (last_argument == NULL) {
8066 call->arguments = argument;
8068 last_argument->next = argument;
8070 last_argument = argument;
8072 if (token.type != ',')
8077 rem_anchor_token(',');
8078 rem_anchor_token(')');
8081 if (function_type == NULL)
8084 function_parameter_t *parameter = function_type->parameters;
8085 call_argument_t *argument = call->arguments;
8086 if (!function_type->unspecified_parameters) {
8087 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8088 parameter = parameter->next, argument = argument->next) {
8089 check_call_argument(parameter, argument, ++pos);
8092 if (parameter != NULL) {
8093 errorf(HERE, "too few arguments to function '%E'", expression);
8094 } else if (argument != NULL && !function_type->variadic) {
8095 errorf(HERE, "too many arguments to function '%E'", expression);
8099 /* do default promotion */
8100 for (; argument != NULL; argument = argument->next) {
8101 type_t *type = argument->expression->base.type;
8103 type = get_default_promoted_type(type);
8105 argument->expression
8106 = create_implicit_cast(argument->expression, type);
8109 check_format(&result->call);
8111 if (warning.aggregate_return &&
8112 is_type_compound(skip_typeref(function_type->return_type))) {
8113 warningf(&result->base.source_position,
8114 "function call has aggregate value");
8121 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8123 static bool same_compound_type(const type_t *type1, const type_t *type2)
8126 is_type_compound(type1) &&
8127 type1->kind == type2->kind &&
8128 type1->compound.compound == type2->compound.compound;
8131 static expression_t const *get_reference_address(expression_t const *expr)
8133 bool regular_take_address = true;
8135 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8136 expr = expr->unary.value;
8138 regular_take_address = false;
8141 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8144 expr = expr->unary.value;
8147 if (expr->kind != EXPR_REFERENCE)
8150 /* special case for functions which are automatically converted to a
8151 * pointer to function without an extra TAKE_ADDRESS operation */
8152 if (!regular_take_address &&
8153 expr->reference.entity->kind != ENTITY_FUNCTION) {
8160 static void warn_reference_address_as_bool(expression_t const* expr)
8162 if (!warning.address)
8165 expr = get_reference_address(expr);
8167 warningf(&expr->base.source_position,
8168 "the address of '%Y' will always evaluate as 'true'",
8169 expr->reference.entity->base.symbol);
8173 static void semantic_condition(expression_t const *const expr,
8174 char const *const context)
8176 type_t *const type = skip_typeref(expr->base.type);
8177 if (is_type_scalar(type)) {
8178 warn_reference_address_as_bool(expr);
8179 } else if (is_type_valid(type)) {
8180 errorf(&expr->base.source_position,
8181 "%s must have scalar type", context);
8186 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8188 * @param expression the conditional expression
8190 static expression_t *parse_conditional_expression(expression_t *expression)
8192 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8194 conditional_expression_t *conditional = &result->conditional;
8195 conditional->condition = expression;
8198 add_anchor_token(':');
8200 /* §6.5.15:2 The first operand shall have scalar type. */
8201 semantic_condition(expression, "condition of conditional operator");
8203 expression_t *true_expression = expression;
8204 bool gnu_cond = false;
8205 if (GNU_MODE && token.type == ':') {
8208 true_expression = parse_expression();
8210 rem_anchor_token(':');
8212 expression_t *false_expression =
8213 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8215 type_t *const orig_true_type = true_expression->base.type;
8216 type_t *const orig_false_type = false_expression->base.type;
8217 type_t *const true_type = skip_typeref(orig_true_type);
8218 type_t *const false_type = skip_typeref(orig_false_type);
8221 type_t *result_type;
8222 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8223 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8224 /* ISO/IEC 14882:1998(E) §5.16:2 */
8225 if (true_expression->kind == EXPR_UNARY_THROW) {
8226 result_type = false_type;
8227 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8228 result_type = true_type;
8230 if (warning.other && (
8231 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8232 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8234 warningf(&conditional->base.source_position,
8235 "ISO C forbids conditional expression with only one void side");
8237 result_type = type_void;
8239 } else if (is_type_arithmetic(true_type)
8240 && is_type_arithmetic(false_type)) {
8241 result_type = semantic_arithmetic(true_type, false_type);
8243 true_expression = create_implicit_cast(true_expression, result_type);
8244 false_expression = create_implicit_cast(false_expression, result_type);
8246 conditional->true_expression = true_expression;
8247 conditional->false_expression = false_expression;
8248 conditional->base.type = result_type;
8249 } else if (same_compound_type(true_type, false_type)) {
8250 /* just take 1 of the 2 types */
8251 result_type = true_type;
8252 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8253 type_t *pointer_type;
8255 expression_t *other_expression;
8256 if (is_type_pointer(true_type) &&
8257 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8258 pointer_type = true_type;
8259 other_type = false_type;
8260 other_expression = false_expression;
8262 pointer_type = false_type;
8263 other_type = true_type;
8264 other_expression = true_expression;
8267 if (is_null_pointer_constant(other_expression)) {
8268 result_type = pointer_type;
8269 } else if (is_type_pointer(other_type)) {
8270 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8271 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8274 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8275 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8277 } else if (types_compatible(get_unqualified_type(to1),
8278 get_unqualified_type(to2))) {
8281 if (warning.other) {
8282 warningf(&conditional->base.source_position,
8283 "pointer types '%T' and '%T' in conditional expression are incompatible",
8284 true_type, false_type);
8289 type_t *const type =
8290 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8291 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8292 } else if (is_type_integer(other_type)) {
8293 if (warning.other) {
8294 warningf(&conditional->base.source_position,
8295 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8297 result_type = pointer_type;
8299 if (is_type_valid(other_type)) {
8300 type_error_incompatible("while parsing conditional",
8301 &expression->base.source_position, true_type, false_type);
8303 result_type = type_error_type;
8306 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8307 type_error_incompatible("while parsing conditional",
8308 &conditional->base.source_position, true_type,
8311 result_type = type_error_type;
8314 conditional->true_expression
8315 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8316 conditional->false_expression
8317 = create_implicit_cast(false_expression, result_type);
8318 conditional->base.type = result_type;
8321 return create_invalid_expression();
8325 * Parse an extension expression.
8327 static expression_t *parse_extension(void)
8329 eat(T___extension__);
8331 bool old_gcc_extension = in_gcc_extension;
8332 in_gcc_extension = true;
8333 expression_t *expression = parse_sub_expression(PREC_UNARY);
8334 in_gcc_extension = old_gcc_extension;
8339 * Parse a __builtin_classify_type() expression.
8341 static expression_t *parse_builtin_classify_type(void)
8343 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8344 result->base.type = type_int;
8346 eat(T___builtin_classify_type);
8349 add_anchor_token(')');
8350 expression_t *expression = parse_expression();
8351 rem_anchor_token(')');
8353 result->classify_type.type_expression = expression;
8357 return create_invalid_expression();
8361 * Parse a delete expression
8362 * ISO/IEC 14882:1998(E) §5.3.5
8364 static expression_t *parse_delete(void)
8366 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8367 result->base.type = type_void;
8371 if (token.type == '[') {
8373 result->kind = EXPR_UNARY_DELETE_ARRAY;
8378 expression_t *const value = parse_sub_expression(PREC_CAST);
8379 result->unary.value = value;
8381 type_t *const type = skip_typeref(value->base.type);
8382 if (!is_type_pointer(type)) {
8383 errorf(&value->base.source_position,
8384 "operand of delete must have pointer type");
8385 } else if (warning.other &&
8386 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8387 warningf(&value->base.source_position,
8388 "deleting 'void*' is undefined");
8395 * Parse a throw expression
8396 * ISO/IEC 14882:1998(E) §15:1
8398 static expression_t *parse_throw(void)
8400 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8401 result->base.type = type_void;
8405 expression_t *value = NULL;
8406 switch (token.type) {
8408 value = parse_assignment_expression();
8409 /* ISO/IEC 14882:1998(E) §15.1:3 */
8410 type_t *const orig_type = value->base.type;
8411 type_t *const type = skip_typeref(orig_type);
8412 if (is_type_incomplete(type)) {
8413 errorf(&value->base.source_position,
8414 "cannot throw object of incomplete type '%T'", orig_type);
8415 } else if (is_type_pointer(type)) {
8416 type_t *const points_to = skip_typeref(type->pointer.points_to);
8417 if (is_type_incomplete(points_to) &&
8418 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8419 errorf(&value->base.source_position,
8420 "cannot throw pointer to incomplete type '%T'", orig_type);
8428 result->unary.value = value;
8433 static bool check_pointer_arithmetic(const source_position_t *source_position,
8434 type_t *pointer_type,
8435 type_t *orig_pointer_type)
8437 type_t *points_to = pointer_type->pointer.points_to;
8438 points_to = skip_typeref(points_to);
8440 if (is_type_incomplete(points_to)) {
8441 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8442 errorf(source_position,
8443 "arithmetic with pointer to incomplete type '%T' not allowed",
8446 } else if (warning.pointer_arith) {
8447 warningf(source_position,
8448 "pointer of type '%T' used in arithmetic",
8451 } else if (is_type_function(points_to)) {
8453 errorf(source_position,
8454 "arithmetic with pointer to function type '%T' not allowed",
8457 } else if (warning.pointer_arith) {
8458 warningf(source_position,
8459 "pointer to a function '%T' used in arithmetic",
8466 static bool is_lvalue(const expression_t *expression)
8468 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8469 switch (expression->kind) {
8470 case EXPR_REFERENCE:
8471 case EXPR_ARRAY_ACCESS:
8473 case EXPR_UNARY_DEREFERENCE:
8477 type_t *type = skip_typeref(expression->base.type);
8479 /* ISO/IEC 14882:1998(E) §3.10:3 */
8480 is_type_reference(type) ||
8481 /* Claim it is an lvalue, if the type is invalid. There was a parse
8482 * error before, which maybe prevented properly recognizing it as
8484 !is_type_valid(type);
8489 static void semantic_incdec(unary_expression_t *expression)
8491 type_t *const orig_type = expression->value->base.type;
8492 type_t *const type = skip_typeref(orig_type);
8493 if (is_type_pointer(type)) {
8494 if (!check_pointer_arithmetic(&expression->base.source_position,
8498 } else if (!is_type_real(type) && is_type_valid(type)) {
8499 /* TODO: improve error message */
8500 errorf(&expression->base.source_position,
8501 "operation needs an arithmetic or pointer type");
8504 if (!is_lvalue(expression->value)) {
8505 /* TODO: improve error message */
8506 errorf(&expression->base.source_position, "lvalue required as operand");
8508 expression->base.type = orig_type;
8511 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8513 type_t *const orig_type = expression->value->base.type;
8514 type_t *const type = skip_typeref(orig_type);
8515 if (!is_type_arithmetic(type)) {
8516 if (is_type_valid(type)) {
8517 /* TODO: improve error message */
8518 errorf(&expression->base.source_position,
8519 "operation needs an arithmetic type");
8524 expression->base.type = orig_type;
8527 static void semantic_unexpr_plus(unary_expression_t *expression)
8529 semantic_unexpr_arithmetic(expression);
8530 if (warning.traditional)
8531 warningf(&expression->base.source_position,
8532 "traditional C rejects the unary plus operator");
8535 static void semantic_not(unary_expression_t *expression)
8537 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8538 semantic_condition(expression->value, "operand of !");
8539 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8542 static void semantic_unexpr_integer(unary_expression_t *expression)
8544 type_t *const orig_type = expression->value->base.type;
8545 type_t *const type = skip_typeref(orig_type);
8546 if (!is_type_integer(type)) {
8547 if (is_type_valid(type)) {
8548 errorf(&expression->base.source_position,
8549 "operand of ~ must be of integer type");
8554 expression->base.type = orig_type;
8557 static void semantic_dereference(unary_expression_t *expression)
8559 type_t *const orig_type = expression->value->base.type;
8560 type_t *const type = skip_typeref(orig_type);
8561 if (!is_type_pointer(type)) {
8562 if (is_type_valid(type)) {
8563 errorf(&expression->base.source_position,
8564 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8569 type_t *result_type = type->pointer.points_to;
8570 result_type = automatic_type_conversion(result_type);
8571 expression->base.type = result_type;
8575 * Record that an address is taken (expression represents an lvalue).
8577 * @param expression the expression
8578 * @param may_be_register if true, the expression might be an register
8580 static void set_address_taken(expression_t *expression, bool may_be_register)
8582 if (expression->kind != EXPR_REFERENCE)
8585 entity_t *const entity = expression->reference.entity;
8587 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8590 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8591 && !may_be_register) {
8592 errorf(&expression->base.source_position,
8593 "address of register %s '%Y' requested",
8594 get_entity_kind_name(entity->kind), entity->base.symbol);
8597 if (entity->kind == ENTITY_VARIABLE) {
8598 entity->variable.address_taken = true;
8600 assert(entity->kind == ENTITY_PARAMETER);
8601 entity->parameter.address_taken = true;
8606 * Check the semantic of the address taken expression.
8608 static void semantic_take_addr(unary_expression_t *expression)
8610 expression_t *value = expression->value;
8611 value->base.type = revert_automatic_type_conversion(value);
8613 type_t *orig_type = value->base.type;
8614 type_t *type = skip_typeref(orig_type);
8615 if (!is_type_valid(type))
8619 if (!is_lvalue(value)) {
8620 errorf(&expression->base.source_position, "'&' requires an lvalue");
8622 if (type->kind == TYPE_BITFIELD) {
8623 errorf(&expression->base.source_position,
8624 "'&' not allowed on object with bitfield type '%T'",
8628 set_address_taken(value, false);
8630 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8633 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8634 static expression_t *parse_##unexpression_type(void) \
8636 expression_t *unary_expression \
8637 = allocate_expression_zero(unexpression_type); \
8639 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8641 sfunc(&unary_expression->unary); \
8643 return unary_expression; \
8646 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8647 semantic_unexpr_arithmetic)
8648 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8649 semantic_unexpr_plus)
8650 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8652 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8653 semantic_dereference)
8654 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8656 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8657 semantic_unexpr_integer)
8658 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8660 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8663 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8665 static expression_t *parse_##unexpression_type(expression_t *left) \
8667 expression_t *unary_expression \
8668 = allocate_expression_zero(unexpression_type); \
8670 unary_expression->unary.value = left; \
8672 sfunc(&unary_expression->unary); \
8674 return unary_expression; \
8677 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8678 EXPR_UNARY_POSTFIX_INCREMENT,
8680 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8681 EXPR_UNARY_POSTFIX_DECREMENT,
8684 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8686 /* TODO: handle complex + imaginary types */
8688 type_left = get_unqualified_type(type_left);
8689 type_right = get_unqualified_type(type_right);
8691 /* § 6.3.1.8 Usual arithmetic conversions */
8692 if (type_left == type_long_double || type_right == type_long_double) {
8693 return type_long_double;
8694 } else if (type_left == type_double || type_right == type_double) {
8696 } else if (type_left == type_float || type_right == type_float) {
8700 type_left = promote_integer(type_left);
8701 type_right = promote_integer(type_right);
8703 if (type_left == type_right)
8706 bool const signed_left = is_type_signed(type_left);
8707 bool const signed_right = is_type_signed(type_right);
8708 int const rank_left = get_rank(type_left);
8709 int const rank_right = get_rank(type_right);
8711 if (signed_left == signed_right)
8712 return rank_left >= rank_right ? type_left : type_right;
8721 u_rank = rank_right;
8722 u_type = type_right;
8724 s_rank = rank_right;
8725 s_type = type_right;
8730 if (u_rank >= s_rank)
8733 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8735 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8736 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8740 case ATOMIC_TYPE_INT: return type_unsigned_int;
8741 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8742 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8744 default: panic("invalid atomic type");
8749 * Check the semantic restrictions for a binary expression.
8751 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8753 expression_t *const left = expression->left;
8754 expression_t *const right = expression->right;
8755 type_t *const orig_type_left = left->base.type;
8756 type_t *const orig_type_right = right->base.type;
8757 type_t *const type_left = skip_typeref(orig_type_left);
8758 type_t *const type_right = skip_typeref(orig_type_right);
8760 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8761 /* TODO: improve error message */
8762 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8763 errorf(&expression->base.source_position,
8764 "operation needs arithmetic types");
8769 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8770 expression->left = create_implicit_cast(left, arithmetic_type);
8771 expression->right = create_implicit_cast(right, arithmetic_type);
8772 expression->base.type = arithmetic_type;
8775 static void warn_div_by_zero(binary_expression_t const *const expression)
8777 if (!warning.div_by_zero ||
8778 !is_type_integer(expression->base.type))
8781 expression_t const *const right = expression->right;
8782 /* The type of the right operand can be different for /= */
8783 if (is_type_integer(right->base.type) &&
8784 is_constant_expression(right) &&
8785 fold_constant(right) == 0) {
8786 warningf(&expression->base.source_position, "division by zero");
8791 * Check the semantic restrictions for a div/mod expression.
8793 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8794 semantic_binexpr_arithmetic(expression);
8795 warn_div_by_zero(expression);
8798 static void semantic_shift_op(binary_expression_t *expression)
8800 expression_t *const left = expression->left;
8801 expression_t *const right = expression->right;
8802 type_t *const orig_type_left = left->base.type;
8803 type_t *const orig_type_right = right->base.type;
8804 type_t * type_left = skip_typeref(orig_type_left);
8805 type_t * type_right = skip_typeref(orig_type_right);
8807 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8808 /* TODO: improve error message */
8809 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8810 errorf(&expression->base.source_position,
8811 "operands of shift operation must have integer types");
8816 type_left = promote_integer(type_left);
8817 type_right = promote_integer(type_right);
8819 expression->left = create_implicit_cast(left, type_left);
8820 expression->right = create_implicit_cast(right, type_right);
8821 expression->base.type = type_left;
8824 static void semantic_add(binary_expression_t *expression)
8826 expression_t *const left = expression->left;
8827 expression_t *const right = expression->right;
8828 type_t *const orig_type_left = left->base.type;
8829 type_t *const orig_type_right = right->base.type;
8830 type_t *const type_left = skip_typeref(orig_type_left);
8831 type_t *const type_right = skip_typeref(orig_type_right);
8834 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8835 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8836 expression->left = create_implicit_cast(left, arithmetic_type);
8837 expression->right = create_implicit_cast(right, arithmetic_type);
8838 expression->base.type = arithmetic_type;
8840 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8841 check_pointer_arithmetic(&expression->base.source_position,
8842 type_left, orig_type_left);
8843 expression->base.type = type_left;
8844 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8845 check_pointer_arithmetic(&expression->base.source_position,
8846 type_right, orig_type_right);
8847 expression->base.type = type_right;
8848 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8849 errorf(&expression->base.source_position,
8850 "invalid operands to binary + ('%T', '%T')",
8851 orig_type_left, orig_type_right);
8855 static void semantic_sub(binary_expression_t *expression)
8857 expression_t *const left = expression->left;
8858 expression_t *const right = expression->right;
8859 type_t *const orig_type_left = left->base.type;
8860 type_t *const orig_type_right = right->base.type;
8861 type_t *const type_left = skip_typeref(orig_type_left);
8862 type_t *const type_right = skip_typeref(orig_type_right);
8863 source_position_t const *const pos = &expression->base.source_position;
8866 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8867 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8868 expression->left = create_implicit_cast(left, arithmetic_type);
8869 expression->right = create_implicit_cast(right, arithmetic_type);
8870 expression->base.type = arithmetic_type;
8872 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8873 check_pointer_arithmetic(&expression->base.source_position,
8874 type_left, orig_type_left);
8875 expression->base.type = type_left;
8876 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8877 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8878 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8879 if (!types_compatible(unqual_left, unqual_right)) {
8881 "subtracting pointers to incompatible types '%T' and '%T'",
8882 orig_type_left, orig_type_right);
8883 } else if (!is_type_object(unqual_left)) {
8884 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8885 errorf(pos, "subtracting pointers to non-object types '%T'",
8887 } else if (warning.other) {
8888 warningf(pos, "subtracting pointers to void");
8891 expression->base.type = type_ptrdiff_t;
8892 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8893 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8894 orig_type_left, orig_type_right);
8898 static void warn_string_literal_address(expression_t const* expr)
8900 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8901 expr = expr->unary.value;
8902 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8904 expr = expr->unary.value;
8907 if (expr->kind == EXPR_STRING_LITERAL ||
8908 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8909 warningf(&expr->base.source_position,
8910 "comparison with string literal results in unspecified behaviour");
8915 * Check the semantics of comparison expressions.
8917 * @param expression The expression to check.
8919 static void semantic_comparison(binary_expression_t *expression)
8921 expression_t *left = expression->left;
8922 expression_t *right = expression->right;
8924 if (warning.address) {
8925 warn_string_literal_address(left);
8926 warn_string_literal_address(right);
8928 expression_t const* const func_left = get_reference_address(left);
8929 if (func_left != NULL && is_null_pointer_constant(right)) {
8930 warningf(&expression->base.source_position,
8931 "the address of '%Y' will never be NULL",
8932 func_left->reference.entity->base.symbol);
8935 expression_t const* const func_right = get_reference_address(right);
8936 if (func_right != NULL && is_null_pointer_constant(right)) {
8937 warningf(&expression->base.source_position,
8938 "the address of '%Y' will never be NULL",
8939 func_right->reference.entity->base.symbol);
8943 type_t *orig_type_left = left->base.type;
8944 type_t *orig_type_right = right->base.type;
8945 type_t *type_left = skip_typeref(orig_type_left);
8946 type_t *type_right = skip_typeref(orig_type_right);
8948 /* TODO non-arithmetic types */
8949 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8950 /* test for signed vs unsigned compares */
8951 if (warning.sign_compare &&
8952 (expression->base.kind != EXPR_BINARY_EQUAL &&
8953 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
8954 (is_type_signed(type_left) != is_type_signed(type_right))) {
8956 /* check if 1 of the operands is a constant, in this case we just
8957 * check wether we can safely represent the resulting constant in
8958 * the type of the other operand. */
8959 expression_t *const_expr = NULL;
8960 expression_t *other_expr = NULL;
8962 if (is_constant_expression(left)) {
8965 } else if (is_constant_expression(right)) {
8970 if (const_expr != NULL) {
8971 type_t *other_type = skip_typeref(other_expr->base.type);
8972 long val = fold_constant(const_expr);
8973 /* TODO: check if val can be represented by other_type */
8977 warningf(&expression->base.source_position,
8978 "comparison between signed and unsigned");
8980 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8981 expression->left = create_implicit_cast(left, arithmetic_type);
8982 expression->right = create_implicit_cast(right, arithmetic_type);
8983 expression->base.type = arithmetic_type;
8984 if (warning.float_equal &&
8985 (expression->base.kind == EXPR_BINARY_EQUAL ||
8986 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8987 is_type_float(arithmetic_type)) {
8988 warningf(&expression->base.source_position,
8989 "comparing floating point with == or != is unsafe");
8991 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8992 /* TODO check compatibility */
8993 } else if (is_type_pointer(type_left)) {
8994 expression->right = create_implicit_cast(right, type_left);
8995 } else if (is_type_pointer(type_right)) {
8996 expression->left = create_implicit_cast(left, type_right);
8997 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8998 type_error_incompatible("invalid operands in comparison",
8999 &expression->base.source_position,
9000 type_left, type_right);
9002 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9006 * Checks if a compound type has constant fields.
9008 static bool has_const_fields(const compound_type_t *type)
9010 compound_t *compound = type->compound;
9011 entity_t *entry = compound->members.entities;
9013 for (; entry != NULL; entry = entry->base.next) {
9014 if (!is_declaration(entry))
9017 const type_t *decl_type = skip_typeref(entry->declaration.type);
9018 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
9025 static bool is_valid_assignment_lhs(expression_t const* const left)
9027 type_t *const orig_type_left = revert_automatic_type_conversion(left);
9028 type_t *const type_left = skip_typeref(orig_type_left);
9030 if (!is_lvalue(left)) {
9031 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
9036 if (left->kind == EXPR_REFERENCE
9037 && left->reference.entity->kind == ENTITY_FUNCTION) {
9038 errorf(HERE, "cannot assign to function '%E'", left);
9042 if (is_type_array(type_left)) {
9043 errorf(HERE, "cannot assign to array '%E'", left);
9046 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
9047 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
9051 if (is_type_incomplete(type_left)) {
9052 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
9053 left, orig_type_left);
9056 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9057 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9058 left, orig_type_left);
9065 static void semantic_arithmetic_assign(binary_expression_t *expression)
9067 expression_t *left = expression->left;
9068 expression_t *right = expression->right;
9069 type_t *orig_type_left = left->base.type;
9070 type_t *orig_type_right = right->base.type;
9072 if (!is_valid_assignment_lhs(left))
9075 type_t *type_left = skip_typeref(orig_type_left);
9076 type_t *type_right = skip_typeref(orig_type_right);
9078 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9079 /* TODO: improve error message */
9080 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9081 errorf(&expression->base.source_position,
9082 "operation needs arithmetic types");
9087 /* combined instructions are tricky. We can't create an implicit cast on
9088 * the left side, because we need the uncasted form for the store.
9089 * The ast2firm pass has to know that left_type must be right_type
9090 * for the arithmetic operation and create a cast by itself */
9091 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9092 expression->right = create_implicit_cast(right, arithmetic_type);
9093 expression->base.type = type_left;
9096 static void semantic_divmod_assign(binary_expression_t *expression)
9098 semantic_arithmetic_assign(expression);
9099 warn_div_by_zero(expression);
9102 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9104 expression_t *const left = expression->left;
9105 expression_t *const right = expression->right;
9106 type_t *const orig_type_left = left->base.type;
9107 type_t *const orig_type_right = right->base.type;
9108 type_t *const type_left = skip_typeref(orig_type_left);
9109 type_t *const type_right = skip_typeref(orig_type_right);
9111 if (!is_valid_assignment_lhs(left))
9114 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9115 /* combined instructions are tricky. We can't create an implicit cast on
9116 * the left side, because we need the uncasted form for the store.
9117 * The ast2firm pass has to know that left_type must be right_type
9118 * for the arithmetic operation and create a cast by itself */
9119 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9120 expression->right = create_implicit_cast(right, arithmetic_type);
9121 expression->base.type = type_left;
9122 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9123 check_pointer_arithmetic(&expression->base.source_position,
9124 type_left, orig_type_left);
9125 expression->base.type = type_left;
9126 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9127 errorf(&expression->base.source_position,
9128 "incompatible types '%T' and '%T' in assignment",
9129 orig_type_left, orig_type_right);
9134 * Check the semantic restrictions of a logical expression.
9136 static void semantic_logical_op(binary_expression_t *expression)
9138 /* §6.5.13:2 Each of the operands shall have scalar type.
9139 * §6.5.14:2 Each of the operands shall have scalar type. */
9140 semantic_condition(expression->left, "left operand of logical operator");
9141 semantic_condition(expression->right, "right operand of logical operator");
9142 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9146 * Check the semantic restrictions of a binary assign expression.
9148 static void semantic_binexpr_assign(binary_expression_t *expression)
9150 expression_t *left = expression->left;
9151 type_t *orig_type_left = left->base.type;
9153 if (!is_valid_assignment_lhs(left))
9156 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9157 report_assign_error(error, orig_type_left, expression->right,
9158 "assignment", &left->base.source_position);
9159 expression->right = create_implicit_cast(expression->right, orig_type_left);
9160 expression->base.type = orig_type_left;
9164 * Determine if the outermost operation (or parts thereof) of the given
9165 * expression has no effect in order to generate a warning about this fact.
9166 * Therefore in some cases this only examines some of the operands of the
9167 * expression (see comments in the function and examples below).
9169 * f() + 23; // warning, because + has no effect
9170 * x || f(); // no warning, because x controls execution of f()
9171 * x ? y : f(); // warning, because y has no effect
9172 * (void)x; // no warning to be able to suppress the warning
9173 * This function can NOT be used for an "expression has definitely no effect"-
9175 static bool expression_has_effect(const expression_t *const expr)
9177 switch (expr->kind) {
9178 case EXPR_UNKNOWN: break;
9179 case EXPR_INVALID: return true; /* do NOT warn */
9180 case EXPR_REFERENCE: return false;
9181 case EXPR_REFERENCE_ENUM_VALUE: return false;
9182 /* suppress the warning for microsoft __noop operations */
9183 case EXPR_CONST: return expr->conste.is_ms_noop;
9184 case EXPR_CHARACTER_CONSTANT: return false;
9185 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9186 case EXPR_STRING_LITERAL: return false;
9187 case EXPR_WIDE_STRING_LITERAL: return false;
9188 case EXPR_LABEL_ADDRESS: return false;
9191 const call_expression_t *const call = &expr->call;
9192 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9195 switch (call->function->builtin_symbol.symbol->ID) {
9196 case T___builtin_va_end: return true;
9197 default: return false;
9201 /* Generate the warning if either the left or right hand side of a
9202 * conditional expression has no effect */
9203 case EXPR_CONDITIONAL: {
9204 const conditional_expression_t *const cond = &expr->conditional;
9206 expression_has_effect(cond->true_expression) &&
9207 expression_has_effect(cond->false_expression);
9210 case EXPR_SELECT: return false;
9211 case EXPR_ARRAY_ACCESS: return false;
9212 case EXPR_SIZEOF: return false;
9213 case EXPR_CLASSIFY_TYPE: return false;
9214 case EXPR_ALIGNOF: return false;
9216 case EXPR_FUNCNAME: return false;
9217 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9218 case EXPR_BUILTIN_CONSTANT_P: return false;
9219 case EXPR_BUILTIN_PREFETCH: return true;
9220 case EXPR_OFFSETOF: return false;
9221 case EXPR_VA_START: return true;
9222 case EXPR_VA_ARG: return true;
9223 case EXPR_STATEMENT: return true; // TODO
9224 case EXPR_COMPOUND_LITERAL: return false;
9226 case EXPR_UNARY_NEGATE: return false;
9227 case EXPR_UNARY_PLUS: return false;
9228 case EXPR_UNARY_BITWISE_NEGATE: return false;
9229 case EXPR_UNARY_NOT: return false;
9230 case EXPR_UNARY_DEREFERENCE: return false;
9231 case EXPR_UNARY_TAKE_ADDRESS: return false;
9232 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9233 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9234 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9235 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9237 /* Treat void casts as if they have an effect in order to being able to
9238 * suppress the warning */
9239 case EXPR_UNARY_CAST: {
9240 type_t *const type = skip_typeref(expr->base.type);
9241 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9244 case EXPR_UNARY_CAST_IMPLICIT: return true;
9245 case EXPR_UNARY_ASSUME: return true;
9246 case EXPR_UNARY_DELETE: return true;
9247 case EXPR_UNARY_DELETE_ARRAY: return true;
9248 case EXPR_UNARY_THROW: return true;
9250 case EXPR_BINARY_ADD: return false;
9251 case EXPR_BINARY_SUB: return false;
9252 case EXPR_BINARY_MUL: return false;
9253 case EXPR_BINARY_DIV: return false;
9254 case EXPR_BINARY_MOD: return false;
9255 case EXPR_BINARY_EQUAL: return false;
9256 case EXPR_BINARY_NOTEQUAL: return false;
9257 case EXPR_BINARY_LESS: return false;
9258 case EXPR_BINARY_LESSEQUAL: return false;
9259 case EXPR_BINARY_GREATER: return false;
9260 case EXPR_BINARY_GREATEREQUAL: return false;
9261 case EXPR_BINARY_BITWISE_AND: return false;
9262 case EXPR_BINARY_BITWISE_OR: return false;
9263 case EXPR_BINARY_BITWISE_XOR: return false;
9264 case EXPR_BINARY_SHIFTLEFT: return false;
9265 case EXPR_BINARY_SHIFTRIGHT: return false;
9266 case EXPR_BINARY_ASSIGN: return true;
9267 case EXPR_BINARY_MUL_ASSIGN: return true;
9268 case EXPR_BINARY_DIV_ASSIGN: return true;
9269 case EXPR_BINARY_MOD_ASSIGN: return true;
9270 case EXPR_BINARY_ADD_ASSIGN: return true;
9271 case EXPR_BINARY_SUB_ASSIGN: return true;
9272 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9273 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9274 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9275 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9276 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9278 /* Only examine the right hand side of && and ||, because the left hand
9279 * side already has the effect of controlling the execution of the right
9281 case EXPR_BINARY_LOGICAL_AND:
9282 case EXPR_BINARY_LOGICAL_OR:
9283 /* Only examine the right hand side of a comma expression, because the left
9284 * hand side has a separate warning */
9285 case EXPR_BINARY_COMMA:
9286 return expression_has_effect(expr->binary.right);
9288 case EXPR_BINARY_ISGREATER: return false;
9289 case EXPR_BINARY_ISGREATEREQUAL: return false;
9290 case EXPR_BINARY_ISLESS: return false;
9291 case EXPR_BINARY_ISLESSEQUAL: return false;
9292 case EXPR_BINARY_ISLESSGREATER: return false;
9293 case EXPR_BINARY_ISUNORDERED: return false;
9296 internal_errorf(HERE, "unexpected expression");
9299 static void semantic_comma(binary_expression_t *expression)
9301 if (warning.unused_value) {
9302 const expression_t *const left = expression->left;
9303 if (!expression_has_effect(left)) {
9304 warningf(&left->base.source_position,
9305 "left-hand operand of comma expression has no effect");
9308 expression->base.type = expression->right->base.type;
9312 * @param prec_r precedence of the right operand
9314 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9315 static expression_t *parse_##binexpression_type(expression_t *left) \
9317 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9318 binexpr->binary.left = left; \
9321 expression_t *right = parse_sub_expression(prec_r); \
9323 binexpr->binary.right = right; \
9324 sfunc(&binexpr->binary); \
9329 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9330 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9331 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9332 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9333 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9334 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9335 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9336 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9337 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9338 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9339 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9340 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9341 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9342 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9343 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9344 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9345 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9346 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9347 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9348 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9349 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9350 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9351 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9352 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9353 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9354 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9355 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9356 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9357 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9358 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9361 static expression_t *parse_sub_expression(precedence_t precedence)
9363 if (token.type < 0) {
9364 return expected_expression_error();
9367 expression_parser_function_t *parser
9368 = &expression_parsers[token.type];
9369 source_position_t source_position = token.source_position;
9372 if (parser->parser != NULL) {
9373 left = parser->parser();
9375 left = parse_primary_expression();
9377 assert(left != NULL);
9378 left->base.source_position = source_position;
9381 if (token.type < 0) {
9382 return expected_expression_error();
9385 parser = &expression_parsers[token.type];
9386 if (parser->infix_parser == NULL)
9388 if (parser->infix_precedence < precedence)
9391 left = parser->infix_parser(left);
9393 assert(left != NULL);
9394 assert(left->kind != EXPR_UNKNOWN);
9395 left->base.source_position = source_position;
9402 * Parse an expression.
9404 static expression_t *parse_expression(void)
9406 return parse_sub_expression(PREC_EXPRESSION);
9410 * Register a parser for a prefix-like operator.
9412 * @param parser the parser function
9413 * @param token_type the token type of the prefix token
9415 static void register_expression_parser(parse_expression_function parser,
9418 expression_parser_function_t *entry = &expression_parsers[token_type];
9420 if (entry->parser != NULL) {
9421 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9422 panic("trying to register multiple expression parsers for a token");
9424 entry->parser = parser;
9428 * Register a parser for an infix operator with given precedence.
9430 * @param parser the parser function
9431 * @param token_type the token type of the infix operator
9432 * @param precedence the precedence of the operator
9434 static void register_infix_parser(parse_expression_infix_function parser,
9435 int token_type, unsigned precedence)
9437 expression_parser_function_t *entry = &expression_parsers[token_type];
9439 if (entry->infix_parser != NULL) {
9440 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9441 panic("trying to register multiple infix expression parsers for a "
9444 entry->infix_parser = parser;
9445 entry->infix_precedence = precedence;
9449 * Initialize the expression parsers.
9451 static void init_expression_parsers(void)
9453 memset(&expression_parsers, 0, sizeof(expression_parsers));
9455 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9456 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9457 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9458 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9459 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9460 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9461 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9462 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9463 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9464 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9465 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9466 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9467 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9468 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9469 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9470 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9471 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9472 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9473 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9474 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9475 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9476 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9477 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9478 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9479 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9480 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9481 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9482 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9483 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9484 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9485 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9486 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9487 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9488 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9489 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9490 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9491 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9493 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9494 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9495 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9496 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9497 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9498 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9499 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9500 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9501 register_expression_parser(parse_sizeof, T_sizeof);
9502 register_expression_parser(parse_alignof, T___alignof__);
9503 register_expression_parser(parse_extension, T___extension__);
9504 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9505 register_expression_parser(parse_delete, T_delete);
9506 register_expression_parser(parse_throw, T_throw);
9510 * Parse a asm statement arguments specification.
9512 static asm_argument_t *parse_asm_arguments(bool is_out)
9514 asm_argument_t *result = NULL;
9515 asm_argument_t **anchor = &result;
9517 while (token.type == T_STRING_LITERAL || token.type == '[') {
9518 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9519 memset(argument, 0, sizeof(argument[0]));
9521 if (token.type == '[') {
9523 if (token.type != T_IDENTIFIER) {
9524 parse_error_expected("while parsing asm argument",
9525 T_IDENTIFIER, NULL);
9528 argument->symbol = token.v.symbol;
9533 argument->constraints = parse_string_literals();
9535 add_anchor_token(')');
9536 expression_t *expression = parse_expression();
9537 rem_anchor_token(')');
9539 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9540 * change size or type representation (e.g. int -> long is ok, but
9541 * int -> float is not) */
9542 if (expression->kind == EXPR_UNARY_CAST) {
9543 type_t *const type = expression->base.type;
9544 type_kind_t const kind = type->kind;
9545 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9548 if (kind == TYPE_ATOMIC) {
9549 atomic_type_kind_t const akind = type->atomic.akind;
9550 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9551 size = get_atomic_type_size(akind);
9553 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9554 size = get_atomic_type_size(get_intptr_kind());
9558 expression_t *const value = expression->unary.value;
9559 type_t *const value_type = value->base.type;
9560 type_kind_t const value_kind = value_type->kind;
9562 unsigned value_flags;
9563 unsigned value_size;
9564 if (value_kind == TYPE_ATOMIC) {
9565 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9566 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9567 value_size = get_atomic_type_size(value_akind);
9568 } else if (value_kind == TYPE_POINTER) {
9569 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9570 value_size = get_atomic_type_size(get_intptr_kind());
9575 if (value_flags != flags || value_size != size)
9579 } while (expression->kind == EXPR_UNARY_CAST);
9583 if (!is_lvalue(expression)) {
9584 errorf(&expression->base.source_position,
9585 "asm output argument is not an lvalue");
9588 if (argument->constraints.begin[0] == '+')
9589 mark_vars_read(expression, NULL);
9591 mark_vars_read(expression, NULL);
9593 argument->expression = expression;
9596 set_address_taken(expression, true);
9599 anchor = &argument->next;
9601 if (token.type != ',')
9612 * Parse a asm statement clobber specification.
9614 static asm_clobber_t *parse_asm_clobbers(void)
9616 asm_clobber_t *result = NULL;
9617 asm_clobber_t *last = NULL;
9619 while (token.type == T_STRING_LITERAL) {
9620 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9621 clobber->clobber = parse_string_literals();
9624 last->next = clobber;
9630 if (token.type != ',')
9639 * Parse an asm statement.
9641 static statement_t *parse_asm_statement(void)
9643 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9644 asm_statement_t *asm_statement = &statement->asms;
9648 if (token.type == T_volatile) {
9650 asm_statement->is_volatile = true;
9654 add_anchor_token(')');
9655 add_anchor_token(':');
9656 asm_statement->asm_text = parse_string_literals();
9658 if (token.type != ':') {
9659 rem_anchor_token(':');
9664 asm_statement->outputs = parse_asm_arguments(true);
9665 if (token.type != ':') {
9666 rem_anchor_token(':');
9671 asm_statement->inputs = parse_asm_arguments(false);
9672 if (token.type != ':') {
9673 rem_anchor_token(':');
9676 rem_anchor_token(':');
9679 asm_statement->clobbers = parse_asm_clobbers();
9682 rem_anchor_token(')');
9686 if (asm_statement->outputs == NULL) {
9687 /* GCC: An 'asm' instruction without any output operands will be treated
9688 * identically to a volatile 'asm' instruction. */
9689 asm_statement->is_volatile = true;
9694 return create_invalid_statement();
9698 * Parse a case statement.
9700 static statement_t *parse_case_statement(void)
9702 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9703 source_position_t *const pos = &statement->base.source_position;
9707 expression_t *const expression = parse_expression();
9708 statement->case_label.expression = expression;
9709 if (!is_constant_expression(expression)) {
9710 /* This check does not prevent the error message in all cases of an
9711 * prior error while parsing the expression. At least it catches the
9712 * common case of a mistyped enum entry. */
9713 if (is_type_valid(skip_typeref(expression->base.type))) {
9714 errorf(pos, "case label does not reduce to an integer constant");
9716 statement->case_label.is_bad = true;
9718 long const val = fold_constant(expression);
9719 statement->case_label.first_case = val;
9720 statement->case_label.last_case = val;
9724 if (token.type == T_DOTDOTDOT) {
9726 expression_t *const end_range = parse_expression();
9727 statement->case_label.end_range = end_range;
9728 if (!is_constant_expression(end_range)) {
9729 /* This check does not prevent the error message in all cases of an
9730 * prior error while parsing the expression. At least it catches the
9731 * common case of a mistyped enum entry. */
9732 if (is_type_valid(skip_typeref(end_range->base.type))) {
9733 errorf(pos, "case range does not reduce to an integer constant");
9735 statement->case_label.is_bad = true;
9737 long const val = fold_constant(end_range);
9738 statement->case_label.last_case = val;
9740 if (warning.other && val < statement->case_label.first_case) {
9741 statement->case_label.is_empty_range = true;
9742 warningf(pos, "empty range specified");
9748 PUSH_PARENT(statement);
9753 if (current_switch != NULL) {
9754 if (! statement->case_label.is_bad) {
9755 /* Check for duplicate case values */
9756 case_label_statement_t *c = &statement->case_label;
9757 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9758 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9761 if (c->last_case < l->first_case || c->first_case > l->last_case)
9764 errorf(pos, "duplicate case value (previously used %P)",
9765 &l->base.source_position);
9769 /* link all cases into the switch statement */
9770 if (current_switch->last_case == NULL) {
9771 current_switch->first_case = &statement->case_label;
9773 current_switch->last_case->next = &statement->case_label;
9775 current_switch->last_case = &statement->case_label;
9777 errorf(pos, "case label not within a switch statement");
9780 statement_t *const inner_stmt = parse_statement();
9781 statement->case_label.statement = inner_stmt;
9782 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9783 errorf(&inner_stmt->base.source_position, "declaration after case label");
9791 * Parse a default statement.
9793 static statement_t *parse_default_statement(void)
9795 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9799 PUSH_PARENT(statement);
9802 if (current_switch != NULL) {
9803 const case_label_statement_t *def_label = current_switch->default_label;
9804 if (def_label != NULL) {
9805 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9806 &def_label->base.source_position);
9808 current_switch->default_label = &statement->case_label;
9810 /* link all cases into the switch statement */
9811 if (current_switch->last_case == NULL) {
9812 current_switch->first_case = &statement->case_label;
9814 current_switch->last_case->next = &statement->case_label;
9816 current_switch->last_case = &statement->case_label;
9819 errorf(&statement->base.source_position,
9820 "'default' label not within a switch statement");
9823 statement_t *const inner_stmt = parse_statement();
9824 statement->case_label.statement = inner_stmt;
9825 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9826 errorf(&inner_stmt->base.source_position, "declaration after default label");
9833 return create_invalid_statement();
9837 * Parse a label statement.
9839 static statement_t *parse_label_statement(void)
9841 assert(token.type == T_IDENTIFIER);
9842 symbol_t *symbol = token.v.symbol;
9843 label_t *label = get_label(symbol);
9845 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9846 statement->label.label = label;
9850 PUSH_PARENT(statement);
9852 /* if statement is already set then the label is defined twice,
9853 * otherwise it was just mentioned in a goto/local label declaration so far
9855 if (label->statement != NULL) {
9856 errorf(HERE, "duplicate label '%Y' (declared %P)",
9857 symbol, &label->base.source_position);
9859 label->base.source_position = token.source_position;
9860 label->statement = statement;
9865 if (token.type == '}') {
9866 /* TODO only warn? */
9867 if (warning.other && false) {
9868 warningf(HERE, "label at end of compound statement");
9869 statement->label.statement = create_empty_statement();
9871 errorf(HERE, "label at end of compound statement");
9872 statement->label.statement = create_invalid_statement();
9874 } else if (token.type == ';') {
9875 /* Eat an empty statement here, to avoid the warning about an empty
9876 * statement after a label. label:; is commonly used to have a label
9877 * before a closing brace. */
9878 statement->label.statement = create_empty_statement();
9881 statement_t *const inner_stmt = parse_statement();
9882 statement->label.statement = inner_stmt;
9883 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9884 errorf(&inner_stmt->base.source_position, "declaration after label");
9888 /* remember the labels in a list for later checking */
9889 *label_anchor = &statement->label;
9890 label_anchor = &statement->label.next;
9897 * Parse an if statement.
9899 static statement_t *parse_if(void)
9901 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9905 PUSH_PARENT(statement);
9907 add_anchor_token('{');
9910 add_anchor_token(')');
9911 expression_t *const expr = parse_expression();
9912 statement->ifs.condition = expr;
9913 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9915 semantic_condition(expr, "condition of 'if'-statment");
9916 mark_vars_read(expr, NULL);
9917 rem_anchor_token(')');
9921 rem_anchor_token('{');
9923 add_anchor_token(T_else);
9924 statement->ifs.true_statement = parse_statement();
9925 rem_anchor_token(T_else);
9927 if (token.type == T_else) {
9929 statement->ifs.false_statement = parse_statement();
9937 * Check that all enums are handled in a switch.
9939 * @param statement the switch statement to check
9941 static void check_enum_cases(const switch_statement_t *statement) {
9942 const type_t *type = skip_typeref(statement->expression->base.type);
9943 if (! is_type_enum(type))
9945 const enum_type_t *enumt = &type->enumt;
9947 /* if we have a default, no warnings */
9948 if (statement->default_label != NULL)
9951 /* FIXME: calculation of value should be done while parsing */
9952 /* TODO: quadratic algorithm here. Change to an n log n one */
9953 long last_value = -1;
9954 const entity_t *entry = enumt->enume->base.next;
9955 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9956 entry = entry->base.next) {
9957 const expression_t *expression = entry->enum_value.value;
9958 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9960 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9961 if (l->expression == NULL)
9963 if (l->first_case <= value && value <= l->last_case) {
9969 warningf(&statement->base.source_position,
9970 "enumeration value '%Y' not handled in switch",
9971 entry->base.symbol);
9978 * Parse a switch statement.
9980 static statement_t *parse_switch(void)
9982 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9986 PUSH_PARENT(statement);
9989 add_anchor_token(')');
9990 expression_t *const expr = parse_expression();
9991 mark_vars_read(expr, NULL);
9992 type_t * type = skip_typeref(expr->base.type);
9993 if (is_type_integer(type)) {
9994 type = promote_integer(type);
9995 if (warning.traditional) {
9996 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9997 warningf(&expr->base.source_position,
9998 "'%T' switch expression not converted to '%T' in ISO C",
10002 } else if (is_type_valid(type)) {
10003 errorf(&expr->base.source_position,
10004 "switch quantity is not an integer, but '%T'", type);
10005 type = type_error_type;
10007 statement->switchs.expression = create_implicit_cast(expr, type);
10009 rem_anchor_token(')');
10011 switch_statement_t *rem = current_switch;
10012 current_switch = &statement->switchs;
10013 statement->switchs.body = parse_statement();
10014 current_switch = rem;
10016 if (warning.switch_default &&
10017 statement->switchs.default_label == NULL) {
10018 warningf(&statement->base.source_position, "switch has no default case");
10020 if (warning.switch_enum)
10021 check_enum_cases(&statement->switchs);
10027 return create_invalid_statement();
10030 static statement_t *parse_loop_body(statement_t *const loop)
10032 statement_t *const rem = current_loop;
10033 current_loop = loop;
10035 statement_t *const body = parse_statement();
10037 current_loop = rem;
10042 * Parse a while statement.
10044 static statement_t *parse_while(void)
10046 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
10050 PUSH_PARENT(statement);
10053 add_anchor_token(')');
10054 expression_t *const cond = parse_expression();
10055 statement->whiles.condition = cond;
10056 /* §6.8.5:2 The controlling expression of an iteration statement shall
10057 * have scalar type. */
10058 semantic_condition(cond, "condition of 'while'-statement");
10059 mark_vars_read(cond, NULL);
10060 rem_anchor_token(')');
10063 statement->whiles.body = parse_loop_body(statement);
10069 return create_invalid_statement();
10073 * Parse a do statement.
10075 static statement_t *parse_do(void)
10077 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10081 PUSH_PARENT(statement);
10083 add_anchor_token(T_while);
10084 statement->do_while.body = parse_loop_body(statement);
10085 rem_anchor_token(T_while);
10089 add_anchor_token(')');
10090 expression_t *const cond = parse_expression();
10091 statement->do_while.condition = cond;
10092 /* §6.8.5:2 The controlling expression of an iteration statement shall
10093 * have scalar type. */
10094 semantic_condition(cond, "condition of 'do-while'-statement");
10095 mark_vars_read(cond, NULL);
10096 rem_anchor_token(')');
10104 return create_invalid_statement();
10108 * Parse a for statement.
10110 static statement_t *parse_for(void)
10112 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10116 PUSH_PARENT(statement);
10118 size_t const top = environment_top();
10119 scope_t *old_scope = scope_push(&statement->fors.scope);
10122 add_anchor_token(')');
10124 if (token.type == ';') {
10126 } else if (is_declaration_specifier(&token, false)) {
10127 parse_declaration(record_entity, DECL_FLAGS_NONE);
10129 add_anchor_token(';');
10130 expression_t *const init = parse_expression();
10131 statement->fors.initialisation = init;
10132 mark_vars_read(init, ENT_ANY);
10133 if (warning.unused_value && !expression_has_effect(init)) {
10134 warningf(&init->base.source_position,
10135 "initialisation of 'for'-statement has no effect");
10137 rem_anchor_token(';');
10141 if (token.type != ';') {
10142 add_anchor_token(';');
10143 expression_t *const cond = parse_expression();
10144 statement->fors.condition = cond;
10145 /* §6.8.5:2 The controlling expression of an iteration statement
10146 * shall have scalar type. */
10147 semantic_condition(cond, "condition of 'for'-statement");
10148 mark_vars_read(cond, NULL);
10149 rem_anchor_token(';');
10152 if (token.type != ')') {
10153 expression_t *const step = parse_expression();
10154 statement->fors.step = step;
10155 mark_vars_read(step, ENT_ANY);
10156 if (warning.unused_value && !expression_has_effect(step)) {
10157 warningf(&step->base.source_position,
10158 "step of 'for'-statement has no effect");
10162 rem_anchor_token(')');
10163 statement->fors.body = parse_loop_body(statement);
10165 assert(current_scope == &statement->fors.scope);
10166 scope_pop(old_scope);
10167 environment_pop_to(top);
10174 rem_anchor_token(')');
10175 assert(current_scope == &statement->fors.scope);
10176 scope_pop(old_scope);
10177 environment_pop_to(top);
10179 return create_invalid_statement();
10183 * Parse a goto statement.
10185 static statement_t *parse_goto(void)
10187 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10190 if (GNU_MODE && token.type == '*') {
10192 expression_t *expression = parse_expression();
10193 mark_vars_read(expression, NULL);
10195 /* Argh: although documentation says the expression must be of type void*,
10196 * gcc accepts anything that can be casted into void* without error */
10197 type_t *type = expression->base.type;
10199 if (type != type_error_type) {
10200 if (!is_type_pointer(type) && !is_type_integer(type)) {
10201 errorf(&expression->base.source_position,
10202 "cannot convert to a pointer type");
10203 } else if (warning.other && type != type_void_ptr) {
10204 warningf(&expression->base.source_position,
10205 "type of computed goto expression should be 'void*' not '%T'", type);
10207 expression = create_implicit_cast(expression, type_void_ptr);
10210 statement->gotos.expression = expression;
10212 if (token.type != T_IDENTIFIER) {
10214 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10216 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10217 eat_until_anchor();
10220 symbol_t *symbol = token.v.symbol;
10223 statement->gotos.label = get_label(symbol);
10226 /* remember the goto's in a list for later checking */
10227 *goto_anchor = &statement->gotos;
10228 goto_anchor = &statement->gotos.next;
10234 return create_invalid_statement();
10238 * Parse a continue statement.
10240 static statement_t *parse_continue(void)
10242 if (current_loop == NULL) {
10243 errorf(HERE, "continue statement not within loop");
10246 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10256 * Parse a break statement.
10258 static statement_t *parse_break(void)
10260 if (current_switch == NULL && current_loop == NULL) {
10261 errorf(HERE, "break statement not within loop or switch");
10264 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10274 * Parse a __leave statement.
10276 static statement_t *parse_leave_statement(void)
10278 if (current_try == NULL) {
10279 errorf(HERE, "__leave statement not within __try");
10282 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10292 * Check if a given entity represents a local variable.
10294 static bool is_local_variable(const entity_t *entity)
10296 if (entity->kind != ENTITY_VARIABLE)
10299 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10300 case STORAGE_CLASS_AUTO:
10301 case STORAGE_CLASS_REGISTER: {
10302 const type_t *type = skip_typeref(entity->declaration.type);
10303 if (is_type_function(type)) {
10315 * Check if a given expression represents a local variable.
10317 static bool expression_is_local_variable(const expression_t *expression)
10319 if (expression->base.kind != EXPR_REFERENCE) {
10322 const entity_t *entity = expression->reference.entity;
10323 return is_local_variable(entity);
10327 * Check if a given expression represents a local variable and
10328 * return its declaration then, else return NULL.
10330 entity_t *expression_is_variable(const expression_t *expression)
10332 if (expression->base.kind != EXPR_REFERENCE) {
10335 entity_t *entity = expression->reference.entity;
10336 if (entity->kind != ENTITY_VARIABLE)
10343 * Parse a return statement.
10345 static statement_t *parse_return(void)
10349 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10351 expression_t *return_value = NULL;
10352 if (token.type != ';') {
10353 return_value = parse_expression();
10354 mark_vars_read(return_value, NULL);
10357 const type_t *const func_type = skip_typeref(current_function->base.type);
10358 assert(is_type_function(func_type));
10359 type_t *const return_type = skip_typeref(func_type->function.return_type);
10361 if (return_value != NULL) {
10362 type_t *return_value_type = skip_typeref(return_value->base.type);
10364 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) &&
10365 !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10366 if (warning.other) {
10367 warningf(&statement->base.source_position,
10368 "'return' with a value, in function returning void");
10370 return_value = NULL;
10372 assign_error_t error = semantic_assign(return_type, return_value);
10373 report_assign_error(error, return_type, return_value, "'return'",
10374 &statement->base.source_position);
10375 return_value = create_implicit_cast(return_value, return_type);
10377 /* check for returning address of a local var */
10378 if (warning.other && return_value != NULL
10379 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10380 const expression_t *expression = return_value->unary.value;
10381 if (expression_is_local_variable(expression)) {
10382 warningf(&statement->base.source_position,
10383 "function returns address of local variable");
10386 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10387 warningf(&statement->base.source_position,
10388 "'return' without value, in function returning non-void");
10390 statement->returns.value = return_value;
10399 * Parse a declaration statement.
10401 static statement_t *parse_declaration_statement(void)
10403 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10405 entity_t *before = current_scope->last_entity;
10407 parse_external_declaration();
10409 parse_declaration(record_entity, DECL_FLAGS_NONE);
10412 if (before == NULL) {
10413 statement->declaration.declarations_begin = current_scope->entities;
10415 statement->declaration.declarations_begin = before->base.next;
10417 statement->declaration.declarations_end = current_scope->last_entity;
10423 * Parse an expression statement, ie. expr ';'.
10425 static statement_t *parse_expression_statement(void)
10427 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10429 expression_t *const expr = parse_expression();
10430 statement->expression.expression = expr;
10431 mark_vars_read(expr, ENT_ANY);
10440 * Parse a microsoft __try { } __finally { } or
10441 * __try{ } __except() { }
10443 static statement_t *parse_ms_try_statment(void)
10445 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10448 PUSH_PARENT(statement);
10450 ms_try_statement_t *rem = current_try;
10451 current_try = &statement->ms_try;
10452 statement->ms_try.try_statement = parse_compound_statement(false);
10457 if (token.type == T___except) {
10460 add_anchor_token(')');
10461 expression_t *const expr = parse_expression();
10462 mark_vars_read(expr, NULL);
10463 type_t * type = skip_typeref(expr->base.type);
10464 if (is_type_integer(type)) {
10465 type = promote_integer(type);
10466 } else if (is_type_valid(type)) {
10467 errorf(&expr->base.source_position,
10468 "__expect expression is not an integer, but '%T'", type);
10469 type = type_error_type;
10471 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10472 rem_anchor_token(')');
10474 statement->ms_try.final_statement = parse_compound_statement(false);
10475 } else if (token.type == T__finally) {
10477 statement->ms_try.final_statement = parse_compound_statement(false);
10479 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10480 return create_invalid_statement();
10484 return create_invalid_statement();
10487 static statement_t *parse_empty_statement(void)
10489 if (warning.empty_statement) {
10490 warningf(HERE, "statement is empty");
10492 statement_t *const statement = create_empty_statement();
10497 static statement_t *parse_local_label_declaration(void)
10499 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10503 entity_t *begin = NULL, *end = NULL;
10506 if (token.type != T_IDENTIFIER) {
10507 parse_error_expected("while parsing local label declaration",
10508 T_IDENTIFIER, NULL);
10511 symbol_t *symbol = token.v.symbol;
10512 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10513 if (entity != NULL && entity->base.parent_scope == current_scope) {
10514 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10515 symbol, &entity->base.source_position);
10517 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10519 entity->base.parent_scope = current_scope;
10520 entity->base.namespc = NAMESPACE_LABEL;
10521 entity->base.source_position = token.source_position;
10522 entity->base.symbol = symbol;
10525 end->base.next = entity;
10530 environment_push(entity);
10534 if (token.type != ',')
10540 statement->declaration.declarations_begin = begin;
10541 statement->declaration.declarations_end = end;
10545 static void parse_namespace_definition(void)
10549 entity_t *entity = NULL;
10550 symbol_t *symbol = NULL;
10552 if (token.type == T_IDENTIFIER) {
10553 symbol = token.v.symbol;
10556 entity = get_entity(symbol, NAMESPACE_NORMAL);
10557 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10558 && entity->base.parent_scope == current_scope) {
10559 error_redefined_as_different_kind(&token.source_position,
10560 entity, ENTITY_NAMESPACE);
10565 if (entity == NULL) {
10566 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10567 entity->base.symbol = symbol;
10568 entity->base.source_position = token.source_position;
10569 entity->base.namespc = NAMESPACE_NORMAL;
10570 entity->base.parent_scope = current_scope;
10573 if (token.type == '=') {
10574 /* TODO: parse namespace alias */
10575 panic("namespace alias definition not supported yet");
10578 environment_push(entity);
10579 append_entity(current_scope, entity);
10581 size_t const top = environment_top();
10582 scope_t *old_scope = scope_push(&entity->namespacee.members);
10589 assert(current_scope == &entity->namespacee.members);
10590 scope_pop(old_scope);
10591 environment_pop_to(top);
10595 * Parse a statement.
10596 * There's also parse_statement() which additionally checks for
10597 * "statement has no effect" warnings
10599 static statement_t *intern_parse_statement(void)
10601 statement_t *statement = NULL;
10603 /* declaration or statement */
10604 add_anchor_token(';');
10605 switch (token.type) {
10606 case T_IDENTIFIER: {
10607 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10608 if (la1_type == ':') {
10609 statement = parse_label_statement();
10610 } else if (is_typedef_symbol(token.v.symbol)) {
10611 statement = parse_declaration_statement();
10613 /* it's an identifier, the grammar says this must be an
10614 * expression statement. However it is common that users mistype
10615 * declaration types, so we guess a bit here to improve robustness
10616 * for incorrect programs */
10617 switch (la1_type) {
10620 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10621 goto expression_statment;
10626 statement = parse_declaration_statement();
10630 expression_statment:
10631 statement = parse_expression_statement();
10638 case T___extension__:
10639 /* This can be a prefix to a declaration or an expression statement.
10640 * We simply eat it now and parse the rest with tail recursion. */
10643 } while (token.type == T___extension__);
10644 bool old_gcc_extension = in_gcc_extension;
10645 in_gcc_extension = true;
10646 statement = intern_parse_statement();
10647 in_gcc_extension = old_gcc_extension;
10651 statement = parse_declaration_statement();
10655 statement = parse_local_label_declaration();
10658 case ';': statement = parse_empty_statement(); break;
10659 case '{': statement = parse_compound_statement(false); break;
10660 case T___leave: statement = parse_leave_statement(); break;
10661 case T___try: statement = parse_ms_try_statment(); break;
10662 case T_asm: statement = parse_asm_statement(); break;
10663 case T_break: statement = parse_break(); break;
10664 case T_case: statement = parse_case_statement(); break;
10665 case T_continue: statement = parse_continue(); break;
10666 case T_default: statement = parse_default_statement(); break;
10667 case T_do: statement = parse_do(); break;
10668 case T_for: statement = parse_for(); break;
10669 case T_goto: statement = parse_goto(); break;
10670 case T_if: statement = parse_if(); break;
10671 case T_return: statement = parse_return(); break;
10672 case T_switch: statement = parse_switch(); break;
10673 case T_while: statement = parse_while(); break;
10676 statement = parse_expression_statement();
10680 errorf(HERE, "unexpected token %K while parsing statement", &token);
10681 statement = create_invalid_statement();
10686 rem_anchor_token(';');
10688 assert(statement != NULL
10689 && statement->base.source_position.input_name != NULL);
10695 * parse a statement and emits "statement has no effect" warning if needed
10696 * (This is really a wrapper around intern_parse_statement with check for 1
10697 * single warning. It is needed, because for statement expressions we have
10698 * to avoid the warning on the last statement)
10700 static statement_t *parse_statement(void)
10702 statement_t *statement = intern_parse_statement();
10704 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10705 expression_t *expression = statement->expression.expression;
10706 if (!expression_has_effect(expression)) {
10707 warningf(&expression->base.source_position,
10708 "statement has no effect");
10716 * Parse a compound statement.
10718 static statement_t *parse_compound_statement(bool inside_expression_statement)
10720 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10722 PUSH_PARENT(statement);
10725 add_anchor_token('}');
10727 size_t const top = environment_top();
10728 scope_t *old_scope = scope_push(&statement->compound.scope);
10730 statement_t **anchor = &statement->compound.statements;
10731 bool only_decls_so_far = true;
10732 while (token.type != '}') {
10733 if (token.type == T_EOF) {
10734 errorf(&statement->base.source_position,
10735 "EOF while parsing compound statement");
10738 statement_t *sub_statement = intern_parse_statement();
10739 if (is_invalid_statement(sub_statement)) {
10740 /* an error occurred. if we are at an anchor, return */
10746 if (warning.declaration_after_statement) {
10747 if (sub_statement->kind != STATEMENT_DECLARATION) {
10748 only_decls_so_far = false;
10749 } else if (!only_decls_so_far) {
10750 warningf(&sub_statement->base.source_position,
10751 "ISO C90 forbids mixed declarations and code");
10755 *anchor = sub_statement;
10757 while (sub_statement->base.next != NULL)
10758 sub_statement = sub_statement->base.next;
10760 anchor = &sub_statement->base.next;
10764 /* look over all statements again to produce no effect warnings */
10765 if (warning.unused_value) {
10766 statement_t *sub_statement = statement->compound.statements;
10767 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10768 if (sub_statement->kind != STATEMENT_EXPRESSION)
10770 /* don't emit a warning for the last expression in an expression
10771 * statement as it has always an effect */
10772 if (inside_expression_statement && sub_statement->base.next == NULL)
10775 expression_t *expression = sub_statement->expression.expression;
10776 if (!expression_has_effect(expression)) {
10777 warningf(&expression->base.source_position,
10778 "statement has no effect");
10784 rem_anchor_token('}');
10785 assert(current_scope == &statement->compound.scope);
10786 scope_pop(old_scope);
10787 environment_pop_to(top);
10794 * Check for unused global static functions and variables
10796 static void check_unused_globals(void)
10798 if (!warning.unused_function && !warning.unused_variable)
10801 for (const entity_t *entity = file_scope->entities; entity != NULL;
10802 entity = entity->base.next) {
10803 if (!is_declaration(entity))
10806 const declaration_t *declaration = &entity->declaration;
10807 if (declaration->used ||
10808 declaration->modifiers & DM_UNUSED ||
10809 declaration->modifiers & DM_USED ||
10810 declaration->storage_class != STORAGE_CLASS_STATIC)
10813 type_t *const type = declaration->type;
10815 if (entity->kind == ENTITY_FUNCTION) {
10816 /* inhibit warning for static inline functions */
10817 if (entity->function.is_inline)
10820 s = entity->function.statement != NULL ? "defined" : "declared";
10825 warningf(&declaration->base.source_position, "'%#T' %s but not used",
10826 type, declaration->base.symbol, s);
10830 static void parse_global_asm(void)
10832 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10837 statement->asms.asm_text = parse_string_literals();
10838 statement->base.next = unit->global_asm;
10839 unit->global_asm = statement;
10847 static void parse_linkage_specification(void)
10850 assert(token.type == T_STRING_LITERAL);
10852 const char *linkage = parse_string_literals().begin;
10854 linkage_kind_t old_linkage = current_linkage;
10855 linkage_kind_t new_linkage;
10856 if (strcmp(linkage, "C") == 0) {
10857 new_linkage = LINKAGE_C;
10858 } else if (strcmp(linkage, "C++") == 0) {
10859 new_linkage = LINKAGE_CXX;
10861 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
10862 new_linkage = LINKAGE_INVALID;
10864 current_linkage = new_linkage;
10866 if (token.type == '{') {
10875 assert(current_linkage == new_linkage);
10876 current_linkage = old_linkage;
10879 static void parse_external(void)
10881 switch (token.type) {
10882 DECLARATION_START_NO_EXTERN
10884 case T___extension__:
10885 /* tokens below are for implicit int */
10886 case '&': /* & x; -> int& x; (and error later, because C++ has no
10888 case '*': /* * x; -> int* x; */
10889 case '(': /* (x); -> int (x); */
10890 parse_external_declaration();
10894 if (look_ahead(1)->type == T_STRING_LITERAL) {
10895 parse_linkage_specification();
10897 parse_external_declaration();
10902 parse_global_asm();
10906 parse_namespace_definition();
10910 if (!strict_mode) {
10912 warningf(HERE, "stray ';' outside of function");
10919 errorf(HERE, "stray %K outside of function", &token);
10920 if (token.type == '(' || token.type == '{' || token.type == '[')
10921 eat_until_matching_token(token.type);
10927 static void parse_externals(void)
10929 add_anchor_token('}');
10930 add_anchor_token(T_EOF);
10933 unsigned char token_anchor_copy[T_LAST_TOKEN];
10934 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10937 while (token.type != T_EOF && token.type != '}') {
10939 bool anchor_leak = false;
10940 for (int i = 0; i != T_LAST_TOKEN; ++i) {
10941 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10943 errorf(HERE, "Leaked anchor token %k %d times", i, count);
10944 anchor_leak = true;
10947 if (in_gcc_extension) {
10948 errorf(HERE, "Leaked __extension__");
10949 anchor_leak = true;
10959 rem_anchor_token(T_EOF);
10960 rem_anchor_token('}');
10964 * Parse a translation unit.
10966 static void parse_translation_unit(void)
10968 add_anchor_token(T_EOF);
10973 if (token.type == T_EOF)
10976 errorf(HERE, "stray %K outside of function", &token);
10977 if (token.type == '(' || token.type == '{' || token.type == '[')
10978 eat_until_matching_token(token.type);
10986 * @return the translation unit or NULL if errors occurred.
10988 void start_parsing(void)
10990 environment_stack = NEW_ARR_F(stack_entry_t, 0);
10991 label_stack = NEW_ARR_F(stack_entry_t, 0);
10992 diagnostic_count = 0;
10996 type_set_output(stderr);
10997 ast_set_output(stderr);
10999 assert(unit == NULL);
11000 unit = allocate_ast_zero(sizeof(unit[0]));
11002 assert(file_scope == NULL);
11003 file_scope = &unit->scope;
11005 assert(current_scope == NULL);
11006 scope_push(&unit->scope);
11009 translation_unit_t *finish_parsing(void)
11011 assert(current_scope == &unit->scope);
11014 assert(file_scope == &unit->scope);
11015 check_unused_globals();
11018 DEL_ARR_F(environment_stack);
11019 DEL_ARR_F(label_stack);
11021 translation_unit_t *result = unit;
11026 /* GCC allows global arrays without size and assigns them a length of one,
11027 * if no different declaration follows */
11028 static void complete_incomplete_arrays(void)
11030 size_t n = ARR_LEN(incomplete_arrays);
11031 for (size_t i = 0; i != n; ++i) {
11032 declaration_t *const decl = incomplete_arrays[i];
11033 type_t *const orig_type = decl->type;
11034 type_t *const type = skip_typeref(orig_type);
11036 if (!is_type_incomplete(type))
11039 if (warning.other) {
11040 warningf(&decl->base.source_position,
11041 "array '%#T' assumed to have one element",
11042 orig_type, decl->base.symbol);
11045 type_t *const new_type = duplicate_type(type);
11046 new_type->array.size_constant = true;
11047 new_type->array.has_implicit_size = true;
11048 new_type->array.size = 1;
11050 type_t *const result = typehash_insert(new_type);
11051 if (type != result)
11054 decl->type = result;
11060 lookahead_bufpos = 0;
11061 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
11064 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
11065 incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
11066 parse_translation_unit();
11067 complete_incomplete_arrays();
11068 DEL_ARR_F(incomplete_arrays);
11069 incomplete_arrays = NULL;
11073 * Initialize the parser.
11075 void init_parser(void)
11077 sym_anonymous = symbol_table_insert("<anonymous>");
11079 if (c_mode & _MS) {
11080 /* add predefined symbols for extended-decl-modifier */
11081 sym_align = symbol_table_insert("align");
11082 sym_allocate = symbol_table_insert("allocate");
11083 sym_dllimport = symbol_table_insert("dllimport");
11084 sym_dllexport = symbol_table_insert("dllexport");
11085 sym_naked = symbol_table_insert("naked");
11086 sym_noinline = symbol_table_insert("noinline");
11087 sym_noreturn = symbol_table_insert("noreturn");
11088 sym_nothrow = symbol_table_insert("nothrow");
11089 sym_novtable = symbol_table_insert("novtable");
11090 sym_property = symbol_table_insert("property");
11091 sym_get = symbol_table_insert("get");
11092 sym_put = symbol_table_insert("put");
11093 sym_selectany = symbol_table_insert("selectany");
11094 sym_thread = symbol_table_insert("thread");
11095 sym_uuid = symbol_table_insert("uuid");
11096 sym_deprecated = symbol_table_insert("deprecated");
11097 sym_restrict = symbol_table_insert("restrict");
11098 sym_noalias = symbol_table_insert("noalias");
11100 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11102 init_expression_parsers();
11103 obstack_init(&temp_obst);
11105 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11106 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11110 * Terminate the parser.
11112 void exit_parser(void)
11114 obstack_free(&temp_obst, NULL);