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, error_label) \
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(')');
1342 expect(')', end_error);
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(')');
1372 expect(')', end_error);
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('(');
1392 expect(')', end_error);
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, end_error);
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(')');
1509 expect(')', end_error);
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);
1569 expect(',', end_error);
1570 add_anchor_token(')');
1571 add_anchor_token(',');
1572 parse_constant_expression();
1573 rem_anchor_token(',');
1574 rem_anchor_token(')');
1576 expect(',', end_error);
1577 add_anchor_token(')');
1578 parse_constant_expression();
1579 rem_anchor_token(')');
1580 expect(')', end_error);
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__);
1686 expect('(', end_error);
1687 expect('(', end_error);
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 != ',')
1903 expect(')', end_error);
1904 expect(')', end_error);
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);
1926 expect('(', end_error);
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();
1935 expect(')', end_error);
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(']');
2203 expect(']', end_error);
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;
2218 expect('=', end_error);
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);
2776 expect('}', end_error);
2778 expect('}', end_error);
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 == '}') {
2872 expect(',', end_error);
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);
2937 expect('}', end_error);
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('}');
3127 expect('}', end_error);
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)
3207 expect('(', end_error);
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(')');
3244 expect(')', end_error);
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) {
3340 expect('(', end_error);
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;
3349 expect(')', end_error);
3350 } else if (symbol == sym_allocate) {
3352 expect('(', end_error);
3353 if (token.type != T_IDENTIFIER)
3355 (void)token.v.symbol;
3356 expect(')', end_error);
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) {
3383 expect('(', end_error);
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);
3396 expect('=', end_error);
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 == ',') {
3419 expect(')', end_error);
3420 } else if (symbol == sym_selectany) {
3422 DET_MOD(selectany, DM_SELECTANY);
3423 } else if (symbol == sym_uuid) {
3425 expect('(', end_error);
3426 if (token.type != T_STRING_LITERAL)
3429 expect(')', end_error);
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");
3443 expect(')', end_error);
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;
3561 if (warning.padded) {
3562 warningf(&compound->base.source_position, "'%T' needs padding", type);
3565 if (compound->modifiers & DM_PACKED && warning.packed) {
3566 warningf(&compound->base.source_position,
3567 "superfluous packed attribute on '%T'", type);
3571 type->base.size = offset;
3572 type->base.alignment = alignment;
3576 * Finish the construction of an union type by calculating
3577 * its size and alignment.
3579 static void finish_union_type(compound_type_t *type)
3581 assert(type->compound != NULL);
3583 compound_t *compound = type->compound;
3584 if (! compound->complete)
3588 il_alignment_t alignment = 1;
3590 entity_t *entry = compound->members.entities;
3591 for (; entry != NULL; entry = entry->base.next) {
3592 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3595 type_t *m_type = skip_typeref(entry->declaration.type);
3596 if (! is_type_valid(m_type))
3599 entry->compound_member.offset = 0;
3600 if (m_type->base.size > size)
3601 size = m_type->base.size;
3602 if (m_type->base.alignment > alignment)
3603 alignment = m_type->base.alignment;
3605 if (type->base.alignment != 0) {
3606 alignment = type->base.alignment;
3608 size = (size + alignment - 1) & -alignment;
3609 type->base.size = size;
3610 type->base.alignment = alignment;
3613 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3615 type_t *type = NULL;
3616 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3617 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3618 unsigned type_specifiers = 0;
3619 bool newtype = false;
3620 bool saw_error = false;
3621 bool old_gcc_extension = in_gcc_extension;
3623 specifiers->source_position = token.source_position;
3626 specifiers->modifiers
3627 |= parse_attributes(&specifiers->gnu_attributes);
3628 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3629 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3631 switch (token.type) {
3633 #define MATCH_STORAGE_CLASS(token, class) \
3635 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3636 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3638 specifiers->storage_class = class; \
3639 if (specifiers->thread_local) \
3640 goto check_thread_storage_class; \
3644 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3645 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3646 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3647 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3648 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3652 expect('(', end_error);
3653 add_anchor_token(')');
3654 parse_microsoft_extended_decl_modifier(specifiers);
3655 rem_anchor_token(')');
3656 expect(')', end_error);
3660 if (specifiers->thread_local) {
3661 errorf(HERE, "duplicate '__thread'");
3663 specifiers->thread_local = true;
3664 check_thread_storage_class:
3665 switch (specifiers->storage_class) {
3666 case STORAGE_CLASS_EXTERN:
3667 case STORAGE_CLASS_NONE:
3668 case STORAGE_CLASS_STATIC:
3672 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3673 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3674 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3675 wrong_thread_stoarge_class:
3676 errorf(HERE, "'__thread' used with '%s'", wrong);
3683 /* type qualifiers */
3684 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3686 qualifiers |= qualifier; \
3690 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3691 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3692 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3693 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3694 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3695 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3696 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3697 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3699 case T___extension__:
3701 in_gcc_extension = true;
3704 /* type specifiers */
3705 #define MATCH_SPECIFIER(token, specifier, name) \
3707 if (type_specifiers & specifier) { \
3708 errorf(HERE, "multiple " name " type specifiers given"); \
3710 type_specifiers |= specifier; \
3715 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3716 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3717 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3718 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3719 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3720 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3721 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3722 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3723 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3724 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3725 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3726 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3727 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3728 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3729 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3730 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3731 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3733 case T__forceinline:
3734 /* only in microsoft mode */
3735 specifiers->modifiers |= DM_FORCEINLINE;
3740 specifiers->is_inline = true;
3744 if (type_specifiers & SPECIFIER_LONG_LONG) {
3745 errorf(HERE, "multiple type specifiers given");
3746 } else if (type_specifiers & SPECIFIER_LONG) {
3747 type_specifiers |= SPECIFIER_LONG_LONG;
3749 type_specifiers |= SPECIFIER_LONG;
3755 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3757 type->compound.compound = parse_compound_type_specifier(true);
3758 finish_struct_type(&type->compound);
3762 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3763 type->compound.compound = parse_compound_type_specifier(false);
3764 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3765 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3766 finish_union_type(&type->compound);
3770 type = parse_enum_specifier();
3773 type = parse_typeof();
3775 case T___builtin_va_list:
3776 type = duplicate_type(type_valist);
3780 case T_IDENTIFIER: {
3781 /* only parse identifier if we haven't found a type yet */
3782 if (type != NULL || type_specifiers != 0) {
3783 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3784 * declaration, so it doesn't generate errors about expecting '(' or
3786 switch (look_ahead(1)->type) {
3793 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3797 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3802 goto finish_specifiers;
3806 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3807 if (typedef_type == NULL) {
3808 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3809 * declaration, so it doesn't generate 'implicit int' followed by more
3810 * errors later on. */
3811 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3817 errorf(HERE, "%K does not name a type", &token);
3820 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3822 type = allocate_type_zero(TYPE_TYPEDEF);
3823 type->typedeft.typedefe = &entity->typedefe;
3827 if (la1_type == '&' || la1_type == '*')
3828 goto finish_specifiers;
3833 goto finish_specifiers;
3838 type = typedef_type;
3842 /* function specifier */
3844 goto finish_specifiers;
3849 in_gcc_extension = old_gcc_extension;
3851 if (type == NULL || (saw_error && type_specifiers != 0)) {
3852 atomic_type_kind_t atomic_type;
3854 /* match valid basic types */
3855 switch (type_specifiers) {
3856 case SPECIFIER_VOID:
3857 atomic_type = ATOMIC_TYPE_VOID;
3859 case SPECIFIER_CHAR:
3860 atomic_type = ATOMIC_TYPE_CHAR;
3862 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3863 atomic_type = ATOMIC_TYPE_SCHAR;
3865 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3866 atomic_type = ATOMIC_TYPE_UCHAR;
3868 case SPECIFIER_SHORT:
3869 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3870 case SPECIFIER_SHORT | SPECIFIER_INT:
3871 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3872 atomic_type = ATOMIC_TYPE_SHORT;
3874 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3875 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3876 atomic_type = ATOMIC_TYPE_USHORT;
3879 case SPECIFIER_SIGNED:
3880 case SPECIFIER_SIGNED | SPECIFIER_INT:
3881 atomic_type = ATOMIC_TYPE_INT;
3883 case SPECIFIER_UNSIGNED:
3884 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3885 atomic_type = ATOMIC_TYPE_UINT;
3887 case SPECIFIER_LONG:
3888 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3889 case SPECIFIER_LONG | SPECIFIER_INT:
3890 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3891 atomic_type = ATOMIC_TYPE_LONG;
3893 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3894 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3895 atomic_type = ATOMIC_TYPE_ULONG;
3898 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3899 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3900 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3901 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3903 atomic_type = ATOMIC_TYPE_LONGLONG;
3904 goto warn_about_long_long;
3906 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3907 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3909 atomic_type = ATOMIC_TYPE_ULONGLONG;
3910 warn_about_long_long:
3911 if (warning.long_long) {
3912 warningf(&specifiers->source_position,
3913 "ISO C90 does not support 'long long'");
3917 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3918 atomic_type = unsigned_int8_type_kind;
3921 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3922 atomic_type = unsigned_int16_type_kind;
3925 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3926 atomic_type = unsigned_int32_type_kind;
3929 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3930 atomic_type = unsigned_int64_type_kind;
3933 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3934 atomic_type = unsigned_int128_type_kind;
3937 case SPECIFIER_INT8:
3938 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3939 atomic_type = int8_type_kind;
3942 case SPECIFIER_INT16:
3943 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3944 atomic_type = int16_type_kind;
3947 case SPECIFIER_INT32:
3948 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3949 atomic_type = int32_type_kind;
3952 case SPECIFIER_INT64:
3953 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3954 atomic_type = int64_type_kind;
3957 case SPECIFIER_INT128:
3958 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3959 atomic_type = int128_type_kind;
3962 case SPECIFIER_FLOAT:
3963 atomic_type = ATOMIC_TYPE_FLOAT;
3965 case SPECIFIER_DOUBLE:
3966 atomic_type = ATOMIC_TYPE_DOUBLE;
3968 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3969 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3971 case SPECIFIER_BOOL:
3972 atomic_type = ATOMIC_TYPE_BOOL;
3974 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3975 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3976 atomic_type = ATOMIC_TYPE_FLOAT;
3978 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3979 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3980 atomic_type = ATOMIC_TYPE_DOUBLE;
3982 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3983 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3984 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3987 /* invalid specifier combination, give an error message */
3988 if (type_specifiers == 0) {
3992 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3993 if (!(c_mode & _CXX) && !strict_mode) {
3994 if (warning.implicit_int) {
3995 warningf(HERE, "no type specifiers in declaration, using 'int'");
3997 atomic_type = ATOMIC_TYPE_INT;
4000 errorf(HERE, "no type specifiers given in declaration");
4002 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
4003 (type_specifiers & SPECIFIER_UNSIGNED)) {
4004 errorf(HERE, "signed and unsigned specifiers given");
4005 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
4006 errorf(HERE, "only integer types can be signed or unsigned");
4008 errorf(HERE, "multiple datatypes in declaration");
4013 if (type_specifiers & SPECIFIER_COMPLEX) {
4014 type = allocate_type_zero(TYPE_COMPLEX);
4015 type->complex.akind = atomic_type;
4016 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
4017 type = allocate_type_zero(TYPE_IMAGINARY);
4018 type->imaginary.akind = atomic_type;
4020 type = allocate_type_zero(TYPE_ATOMIC);
4021 type->atomic.akind = atomic_type;
4024 } else if (type_specifiers != 0) {
4025 errorf(HERE, "multiple datatypes in declaration");
4028 /* FIXME: check type qualifiers here */
4030 type->base.qualifiers = qualifiers;
4031 type->base.modifiers = modifiers;
4033 type_t *result = typehash_insert(type);
4034 if (newtype && result != type) {
4038 specifiers->type = result;
4042 specifiers->type = type_error_type;
4046 static type_qualifiers_t parse_type_qualifiers(void)
4048 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
4051 switch (token.type) {
4052 /* type qualifiers */
4053 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
4054 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
4055 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
4056 /* microsoft extended type modifiers */
4057 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4058 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4059 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4060 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4061 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4070 * Parses an K&R identifier list
4072 static void parse_identifier_list(scope_t *scope)
4075 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
4076 entity->base.source_position = token.source_position;
4077 entity->base.namespc = NAMESPACE_NORMAL;
4078 entity->base.symbol = token.v.symbol;
4079 /* a K&R parameter has no type, yet */
4083 append_entity(scope, entity);
4085 if (token.type != ',') {
4089 } while (token.type == T_IDENTIFIER);
4092 static entity_t *parse_parameter(void)
4094 declaration_specifiers_t specifiers;
4095 memset(&specifiers, 0, sizeof(specifiers));
4097 parse_declaration_specifiers(&specifiers);
4099 entity_t *entity = parse_declarator(&specifiers,
4100 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4101 anonymous_entity = NULL;
4105 static void semantic_parameter_incomplete(const entity_t *entity)
4107 assert(entity->kind == ENTITY_PARAMETER);
4109 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
4110 * list in a function declarator that is part of a
4111 * definition of that function shall not have
4112 * incomplete type. */
4113 type_t *type = skip_typeref(entity->declaration.type);
4114 if (is_type_incomplete(type)) {
4115 errorf(&entity->base.source_position,
4116 "parameter '%Y' has incomplete type '%T'", entity->base.symbol,
4117 entity->declaration.type);
4122 * Parses function type parameters (and optionally creates variable_t entities
4123 * for them in a scope)
4125 static void parse_parameters(function_type_t *type, scope_t *scope)
4128 add_anchor_token(')');
4129 int saved_comma_state = save_and_reset_anchor_state(',');
4131 if (token.type == T_IDENTIFIER &&
4132 !is_typedef_symbol(token.v.symbol)) {
4133 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4134 if (la1_type == ',' || la1_type == ')') {
4135 type->kr_style_parameters = true;
4136 type->unspecified_parameters = true;
4137 parse_identifier_list(scope);
4138 goto parameters_finished;
4142 if (token.type == ')') {
4143 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4144 if (!(c_mode & _CXX))
4145 type->unspecified_parameters = true;
4146 goto parameters_finished;
4149 function_parameter_t *parameter;
4150 function_parameter_t *last_parameter = NULL;
4153 switch (token.type) {
4156 type->variadic = true;
4157 goto parameters_finished;
4160 case T___extension__:
4163 entity_t *entity = parse_parameter();
4164 if (entity->kind == ENTITY_TYPEDEF) {
4165 errorf(&entity->base.source_position,
4166 "typedef not allowed as function parameter");
4169 assert(is_declaration(entity));
4171 /* func(void) is not a parameter */
4172 if (last_parameter == NULL
4173 && token.type == ')'
4174 && entity->base.symbol == NULL
4175 && skip_typeref(entity->declaration.type) == type_void) {
4176 goto parameters_finished;
4178 semantic_parameter_incomplete(entity);
4180 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4181 memset(parameter, 0, sizeof(parameter[0]));
4182 parameter->type = entity->declaration.type;
4184 if (scope != NULL) {
4185 append_entity(scope, entity);
4188 if (last_parameter != NULL) {
4189 last_parameter->next = parameter;
4191 type->parameters = parameter;
4193 last_parameter = parameter;
4198 goto parameters_finished;
4200 if (token.type != ',') {
4201 goto parameters_finished;
4207 parameters_finished:
4208 rem_anchor_token(')');
4209 expect(')', end_error);
4212 restore_anchor_state(',', saved_comma_state);
4215 typedef enum construct_type_kind_t {
4218 CONSTRUCT_REFERENCE,
4221 } construct_type_kind_t;
4223 typedef struct construct_type_t construct_type_t;
4224 struct construct_type_t {
4225 construct_type_kind_t kind;
4226 construct_type_t *next;
4229 typedef struct parsed_pointer_t parsed_pointer_t;
4230 struct parsed_pointer_t {
4231 construct_type_t construct_type;
4232 type_qualifiers_t type_qualifiers;
4233 variable_t *base_variable; /**< MS __based extension. */
4236 typedef struct parsed_reference_t parsed_reference_t;
4237 struct parsed_reference_t {
4238 construct_type_t construct_type;
4241 typedef struct construct_function_type_t construct_function_type_t;
4242 struct construct_function_type_t {
4243 construct_type_t construct_type;
4244 type_t *function_type;
4247 typedef struct parsed_array_t parsed_array_t;
4248 struct parsed_array_t {
4249 construct_type_t construct_type;
4250 type_qualifiers_t type_qualifiers;
4256 typedef struct construct_base_type_t construct_base_type_t;
4257 struct construct_base_type_t {
4258 construct_type_t construct_type;
4262 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4266 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4267 memset(pointer, 0, sizeof(pointer[0]));
4268 pointer->construct_type.kind = CONSTRUCT_POINTER;
4269 pointer->type_qualifiers = parse_type_qualifiers();
4270 pointer->base_variable = base_variable;
4272 return &pointer->construct_type;
4275 static construct_type_t *parse_reference_declarator(void)
4279 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4280 memset(reference, 0, sizeof(reference[0]));
4281 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4283 return (construct_type_t*)reference;
4286 static construct_type_t *parse_array_declarator(void)
4289 add_anchor_token(']');
4291 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4292 memset(array, 0, sizeof(array[0]));
4293 array->construct_type.kind = CONSTRUCT_ARRAY;
4295 if (token.type == T_static) {
4296 array->is_static = true;
4300 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4301 if (type_qualifiers != 0) {
4302 if (token.type == T_static) {
4303 array->is_static = true;
4307 array->type_qualifiers = type_qualifiers;
4309 if (token.type == '*' && look_ahead(1)->type == ']') {
4310 array->is_variable = true;
4312 } else if (token.type != ']') {
4313 array->size = parse_assignment_expression();
4316 rem_anchor_token(']');
4317 expect(']', end_error);
4320 return &array->construct_type;
4323 static construct_type_t *parse_function_declarator(scope_t *scope,
4324 decl_modifiers_t modifiers)
4326 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4327 function_type_t *ftype = &type->function;
4329 ftype->linkage = current_linkage;
4331 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4332 case DM_NONE: break;
4333 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4334 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4335 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4336 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4339 errorf(HERE, "multiple calling conventions in declaration");
4343 parse_parameters(ftype, scope);
4345 construct_function_type_t *construct_function_type =
4346 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4347 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4348 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4349 construct_function_type->function_type = type;
4351 return &construct_function_type->construct_type;
4354 typedef struct parse_declarator_env_t {
4355 decl_modifiers_t modifiers;
4357 source_position_t source_position;
4359 } parse_declarator_env_t;
4361 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4362 bool may_be_abstract)
4364 /* construct a single linked list of construct_type_t's which describe
4365 * how to construct the final declarator type */
4366 construct_type_t *first = NULL;
4367 construct_type_t *last = NULL;
4368 gnu_attribute_t *attributes = NULL;
4370 decl_modifiers_t modifiers = parse_attributes(&attributes);
4372 /* MS __based extension */
4373 based_spec_t base_spec;
4374 base_spec.base_variable = NULL;
4377 construct_type_t *type;
4378 switch (token.type) {
4380 if (!(c_mode & _CXX))
4381 errorf(HERE, "references are only available for C++");
4382 if (base_spec.base_variable != NULL && warning.other) {
4383 warningf(&base_spec.source_position,
4384 "__based does not precede a pointer operator, ignored");
4386 type = parse_reference_declarator();
4388 base_spec.base_variable = NULL;
4392 type = parse_pointer_declarator(base_spec.base_variable);
4394 base_spec.base_variable = NULL;
4399 expect('(', end_error);
4400 add_anchor_token(')');
4401 parse_microsoft_based(&base_spec);
4402 rem_anchor_token(')');
4403 expect(')', end_error);
4407 goto ptr_operator_end;
4418 /* TODO: find out if this is correct */
4419 modifiers |= parse_attributes(&attributes);
4422 if (base_spec.base_variable != NULL && warning.other) {
4423 warningf(&base_spec.source_position,
4424 "__based does not precede a pointer operator, ignored");
4428 modifiers |= env->modifiers;
4429 env->modifiers = modifiers;
4432 construct_type_t *inner_types = NULL;
4434 switch (token.type) {
4437 errorf(HERE, "no identifier expected in typename");
4439 env->symbol = token.v.symbol;
4440 env->source_position = token.source_position;
4445 /* §6.7.6:2 footnote 126: Empty parentheses in a type name are
4446 * interpreted as ``function with no parameter specification'', rather
4447 * than redundant parentheses around the omitted identifier. */
4448 if (look_ahead(1)->type != ')') {
4450 add_anchor_token(')');
4451 inner_types = parse_inner_declarator(env, may_be_abstract);
4452 if (inner_types != NULL) {
4453 /* All later declarators only modify the return type */
4456 rem_anchor_token(')');
4457 expect(')', end_error);
4461 if (may_be_abstract)
4463 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4468 construct_type_t *p = last;
4471 construct_type_t *type;
4472 switch (token.type) {
4474 scope_t *scope = NULL;
4476 scope = &env->parameters;
4478 type = parse_function_declarator(scope, modifiers);
4482 type = parse_array_declarator();
4485 goto declarator_finished;
4488 /* insert in the middle of the list (behind p) */
4490 type->next = p->next;
4501 declarator_finished:
4502 /* append inner_types at the end of the list, we don't to set last anymore
4503 * as it's not needed anymore */
4505 assert(first == NULL);
4506 first = inner_types;
4508 last->next = inner_types;
4516 static void parse_declaration_attributes(entity_t *entity)
4518 gnu_attribute_t *attributes = NULL;
4519 decl_modifiers_t modifiers = parse_attributes(&attributes);
4525 if (entity->kind == ENTITY_TYPEDEF) {
4526 modifiers |= entity->typedefe.modifiers;
4527 type = entity->typedefe.type;
4529 assert(is_declaration(entity));
4530 modifiers |= entity->declaration.modifiers;
4531 type = entity->declaration.type;
4536 /* handle these strange/stupid mode attributes */
4537 gnu_attribute_t *attribute = attributes;
4538 for ( ; attribute != NULL; attribute = attribute->next) {
4539 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4542 atomic_type_kind_t akind = attribute->u.akind;
4543 if (!is_type_signed(type)) {
4545 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4546 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4547 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4548 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4550 panic("invalid akind in mode attribute");
4554 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break;
4555 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break;
4556 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break;
4557 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break;
4559 panic("invalid akind in mode attribute");
4563 type = make_atomic_type(akind, type->base.qualifiers);
4566 type_modifiers_t type_modifiers = type->base.modifiers;
4567 if (modifiers & DM_TRANSPARENT_UNION)
4568 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4570 if (type->base.modifiers != type_modifiers) {
4571 type_t *copy = duplicate_type(type);
4572 copy->base.modifiers = type_modifiers;
4574 type = typehash_insert(copy);
4576 obstack_free(type_obst, copy);
4580 if (entity->kind == ENTITY_TYPEDEF) {
4581 entity->typedefe.type = type;
4582 entity->typedefe.modifiers = modifiers;
4584 entity->declaration.type = type;
4585 entity->declaration.modifiers = modifiers;
4589 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4591 construct_type_t *iter = construct_list;
4592 for (; iter != NULL; iter = iter->next) {
4593 switch (iter->kind) {
4594 case CONSTRUCT_INVALID:
4595 internal_errorf(HERE, "invalid type construction found");
4596 case CONSTRUCT_FUNCTION: {
4597 construct_function_type_t *construct_function_type
4598 = (construct_function_type_t*) iter;
4600 type_t *function_type = construct_function_type->function_type;
4602 function_type->function.return_type = type;
4604 type_t *skipped_return_type = skip_typeref(type);
4606 if (is_type_function(skipped_return_type)) {
4607 errorf(HERE, "function returning function is not allowed");
4608 } else if (is_type_array(skipped_return_type)) {
4609 errorf(HERE, "function returning array is not allowed");
4611 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4613 "type qualifiers in return type of function type are meaningless");
4617 type = function_type;
4621 case CONSTRUCT_POINTER: {
4622 if (is_type_reference(skip_typeref(type)))
4623 errorf(HERE, "cannot declare a pointer to reference");
4625 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4626 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4630 case CONSTRUCT_REFERENCE:
4631 if (is_type_reference(skip_typeref(type)))
4632 errorf(HERE, "cannot declare a reference to reference");
4634 type = make_reference_type(type);
4637 case CONSTRUCT_ARRAY: {
4638 if (is_type_reference(skip_typeref(type)))
4639 errorf(HERE, "cannot declare an array of references");
4641 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4642 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4644 expression_t *size_expression = parsed_array->size;
4645 if (size_expression != NULL) {
4647 = create_implicit_cast(size_expression, type_size_t);
4650 array_type->base.qualifiers = parsed_array->type_qualifiers;
4651 array_type->array.element_type = type;
4652 array_type->array.is_static = parsed_array->is_static;
4653 array_type->array.is_variable = parsed_array->is_variable;
4654 array_type->array.size_expression = size_expression;
4656 if (size_expression != NULL) {
4657 if (is_constant_expression(size_expression)) {
4658 array_type->array.size_constant = true;
4659 array_type->array.size
4660 = fold_constant(size_expression);
4662 array_type->array.is_vla = true;
4666 type_t *skipped_type = skip_typeref(type);
4668 if (is_type_incomplete(skipped_type)) {
4669 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4670 } else if (is_type_function(skipped_type)) {
4671 errorf(HERE, "array of functions is not allowed");
4678 type_t *hashed_type = typehash_insert(type);
4679 if (hashed_type != type) {
4680 /* the function type was constructed earlier freeing it here will
4681 * destroy other types... */
4682 if (iter->kind != CONSTRUCT_FUNCTION) {
4692 static type_t *automatic_type_conversion(type_t *orig_type);
4694 static type_t *semantic_parameter(const source_position_t *pos,
4696 const declaration_specifiers_t *specifiers,
4699 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4700 * shall be adjusted to ``qualified pointer to type'',
4702 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4703 * type'' shall be adjusted to ``pointer to function
4704 * returning type'', as in 6.3.2.1. */
4705 type = automatic_type_conversion(type);
4707 if (specifiers->is_inline && is_type_valid(type)) {
4708 errorf(pos, "parameter '%Y' declared 'inline'", symbol);
4711 /* §6.9.1:6 The declarations in the declaration list shall contain
4712 * no storage-class specifier other than register and no
4713 * initializations. */
4714 if (specifiers->thread_local || (
4715 specifiers->storage_class != STORAGE_CLASS_NONE &&
4716 specifiers->storage_class != STORAGE_CLASS_REGISTER)
4718 errorf(pos, "invalid storage class for parameter '%Y'", symbol);
4721 /* delay test for incomplete type, because we might have (void)
4722 * which is legal but incomplete... */
4727 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4728 declarator_flags_t flags)
4730 parse_declarator_env_t env;
4731 memset(&env, 0, sizeof(env));
4732 env.modifiers = specifiers->modifiers;
4734 construct_type_t *construct_type =
4735 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4737 construct_declarator_type(construct_type, specifiers->type);
4738 type_t *type = skip_typeref(orig_type);
4740 if (construct_type != NULL) {
4741 obstack_free(&temp_obst, construct_type);
4745 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4746 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4747 entity->base.symbol = env.symbol;
4748 entity->base.source_position = env.source_position;
4749 entity->typedefe.type = orig_type;
4751 if (anonymous_entity != NULL) {
4752 if (is_type_compound(type)) {
4753 assert(anonymous_entity->compound.alias == NULL);
4754 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4755 anonymous_entity->kind == ENTITY_UNION);
4756 anonymous_entity->compound.alias = entity;
4757 anonymous_entity = NULL;
4758 } else if (is_type_enum(type)) {
4759 assert(anonymous_entity->enume.alias == NULL);
4760 assert(anonymous_entity->kind == ENTITY_ENUM);
4761 anonymous_entity->enume.alias = entity;
4762 anonymous_entity = NULL;
4766 /* create a declaration type entity */
4767 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4768 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4770 if (specifiers->is_inline && is_type_valid(type)) {
4771 errorf(&env.source_position,
4772 "compound member '%Y' declared 'inline'", env.symbol);
4775 if (specifiers->thread_local ||
4776 specifiers->storage_class != STORAGE_CLASS_NONE) {
4777 errorf(&env.source_position,
4778 "compound member '%Y' must have no storage class",
4781 } else if (flags & DECL_IS_PARAMETER) {
4782 orig_type = semantic_parameter(&env.source_position, orig_type,
4783 specifiers, env.symbol);
4785 entity = allocate_entity_zero(ENTITY_PARAMETER);
4786 } else if (is_type_function(type)) {
4787 entity = allocate_entity_zero(ENTITY_FUNCTION);
4789 entity->function.is_inline = specifiers->is_inline;
4790 entity->function.parameters = env.parameters;
4792 if (specifiers->thread_local || (
4793 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4794 specifiers->storage_class != STORAGE_CLASS_NONE &&
4795 specifiers->storage_class != STORAGE_CLASS_STATIC)
4797 errorf(&env.source_position,
4798 "invalid storage class for function '%Y'", env.symbol);
4801 entity = allocate_entity_zero(ENTITY_VARIABLE);
4803 entity->variable.get_property_sym = specifiers->get_property_sym;
4804 entity->variable.put_property_sym = specifiers->put_property_sym;
4805 if (specifiers->alignment != 0) {
4806 /* TODO: add checks here */
4807 entity->variable.alignment = specifiers->alignment;
4810 if (specifiers->is_inline && is_type_valid(type)) {
4811 errorf(&env.source_position,
4812 "variable '%Y' declared 'inline'", env.symbol);
4815 entity->variable.thread_local = specifiers->thread_local;
4817 bool invalid_storage_class = false;
4818 if (current_scope == file_scope) {
4819 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4820 specifiers->storage_class != STORAGE_CLASS_NONE &&
4821 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4822 invalid_storage_class = true;
4825 if (specifiers->thread_local &&
4826 specifiers->storage_class == STORAGE_CLASS_NONE) {
4827 invalid_storage_class = true;
4830 if (invalid_storage_class) {
4831 errorf(&env.source_position,
4832 "invalid storage class for variable '%Y'", env.symbol);
4836 entity->base.source_position = env.source_position;
4837 entity->base.symbol = env.symbol;
4838 entity->base.namespc = NAMESPACE_NORMAL;
4839 entity->declaration.type = orig_type;
4840 entity->declaration.modifiers = env.modifiers;
4841 entity->declaration.deprecated_string = specifiers->deprecated_string;
4843 storage_class_t storage_class = specifiers->storage_class;
4844 entity->declaration.declared_storage_class = storage_class;
4846 if (storage_class == STORAGE_CLASS_NONE && current_scope != file_scope)
4847 storage_class = STORAGE_CLASS_AUTO;
4848 entity->declaration.storage_class = storage_class;
4851 parse_declaration_attributes(entity);
4856 static type_t *parse_abstract_declarator(type_t *base_type)
4858 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4860 type_t *result = construct_declarator_type(construct_type, base_type);
4861 if (construct_type != NULL) {
4862 obstack_free(&temp_obst, construct_type);
4869 * Check if the declaration of main is suspicious. main should be a
4870 * function with external linkage, returning int, taking either zero
4871 * arguments, two, or three arguments of appropriate types, ie.
4873 * int main([ int argc, char **argv [, char **env ] ]).
4875 * @param decl the declaration to check
4876 * @param type the function type of the declaration
4878 static void check_type_of_main(const entity_t *entity)
4880 const source_position_t *pos = &entity->base.source_position;
4881 if (entity->kind != ENTITY_FUNCTION) {
4882 warningf(pos, "'main' is not a function");
4886 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4887 warningf(pos, "'main' is normally a non-static function");
4890 type_t *type = skip_typeref(entity->declaration.type);
4891 assert(is_type_function(type));
4893 function_type_t *func_type = &type->function;
4894 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4895 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4896 func_type->return_type);
4898 const function_parameter_t *parm = func_type->parameters;
4900 type_t *const first_type = parm->type;
4901 if (!types_compatible(skip_typeref(first_type), type_int)) {
4903 "first argument of 'main' should be 'int', but is '%T'",
4908 type_t *const second_type = parm->type;
4909 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4910 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4914 type_t *const third_type = parm->type;
4915 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4916 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4920 goto warn_arg_count;
4924 warningf(pos, "'main' takes only zero, two or three arguments");
4930 * Check if a symbol is the equal to "main".
4932 static bool is_sym_main(const symbol_t *const sym)
4934 return strcmp(sym->string, "main") == 0;
4937 static void error_redefined_as_different_kind(const source_position_t *pos,
4938 const entity_t *old, entity_kind_t new_kind)
4940 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4941 get_entity_kind_name(old->kind), old->base.symbol,
4942 get_entity_kind_name(new_kind), &old->base.source_position);
4946 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4947 * for various problems that occur for multiple definitions
4949 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4951 const symbol_t *const symbol = entity->base.symbol;
4952 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4953 const source_position_t *pos = &entity->base.source_position;
4955 /* can happen in error cases */
4959 entity_t *previous_entity = get_entity(symbol, namespc);
4960 /* pushing the same entity twice will break the stack structure */
4961 assert(previous_entity != entity);
4963 if (entity->kind == ENTITY_FUNCTION) {
4964 type_t *const orig_type = entity->declaration.type;
4965 type_t *const type = skip_typeref(orig_type);
4967 assert(is_type_function(type));
4968 if (type->function.unspecified_parameters &&
4969 warning.strict_prototypes &&
4970 previous_entity == NULL) {
4971 warningf(pos, "function declaration '%#T' is not a prototype",
4975 if (warning.main && current_scope == file_scope
4976 && is_sym_main(symbol)) {
4977 check_type_of_main(entity);
4981 if (is_declaration(entity) &&
4982 warning.nested_externs &&
4983 entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
4984 current_scope != file_scope) {
4985 warningf(pos, "nested extern declaration of '%#T'",
4986 entity->declaration.type, symbol);
4989 if (previous_entity != NULL &&
4990 previous_entity->base.parent_scope == ¤t_function->parameters &&
4991 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
4992 assert(previous_entity->kind == ENTITY_PARAMETER);
4994 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4995 entity->declaration.type, symbol,
4996 previous_entity->declaration.type, symbol,
4997 &previous_entity->base.source_position);
5001 if (previous_entity != NULL &&
5002 previous_entity->base.parent_scope == current_scope) {
5003 if (previous_entity->kind != entity->kind) {
5004 error_redefined_as_different_kind(pos, previous_entity,
5008 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
5009 errorf(pos, "redeclaration of enum entry '%Y' (declared %P)",
5010 symbol, &previous_entity->base.source_position);
5013 if (previous_entity->kind == ENTITY_TYPEDEF) {
5014 /* TODO: C++ allows this for exactly the same type */
5015 errorf(pos, "redefinition of typedef '%Y' (declared %P)",
5016 symbol, &previous_entity->base.source_position);
5020 /* at this point we should have only VARIABLES or FUNCTIONS */
5021 assert(is_declaration(previous_entity) && is_declaration(entity));
5023 declaration_t *const prev_decl = &previous_entity->declaration;
5024 declaration_t *const decl = &entity->declaration;
5026 /* can happen for K&R style declarations */
5027 if (prev_decl->type == NULL &&
5028 previous_entity->kind == ENTITY_PARAMETER &&
5029 entity->kind == ENTITY_PARAMETER) {
5030 prev_decl->type = decl->type;
5031 prev_decl->storage_class = decl->storage_class;
5032 prev_decl->declared_storage_class = decl->declared_storage_class;
5033 prev_decl->modifiers = decl->modifiers;
5034 prev_decl->deprecated_string = decl->deprecated_string;
5035 return previous_entity;
5038 type_t *const orig_type = decl->type;
5039 assert(orig_type != NULL);
5040 type_t *const type = skip_typeref(orig_type);
5041 type_t * prev_type = skip_typeref(prev_decl->type);
5043 if (!types_compatible(type, prev_type)) {
5045 "declaration '%#T' is incompatible with '%#T' (declared %P)",
5046 orig_type, symbol, prev_decl->type, symbol,
5047 &previous_entity->base.source_position);
5049 unsigned old_storage_class = prev_decl->storage_class;
5050 if (warning.redundant_decls &&
5053 !(prev_decl->modifiers & DM_USED) &&
5054 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
5055 warningf(&previous_entity->base.source_position,
5056 "unnecessary static forward declaration for '%#T'",
5057 prev_decl->type, symbol);
5060 unsigned new_storage_class = decl->storage_class;
5061 if (is_type_incomplete(prev_type)) {
5062 prev_decl->type = type;
5066 /* pretend no storage class means extern for function
5067 * declarations (except if the previous declaration is neither
5068 * none nor extern) */
5069 if (entity->kind == ENTITY_FUNCTION) {
5070 if (prev_type->function.unspecified_parameters) {
5071 prev_decl->type = type;
5075 switch (old_storage_class) {
5076 case STORAGE_CLASS_NONE:
5077 old_storage_class = STORAGE_CLASS_EXTERN;
5080 case STORAGE_CLASS_EXTERN:
5081 if (is_definition) {
5082 if (warning.missing_prototypes &&
5083 prev_type->function.unspecified_parameters &&
5084 !is_sym_main(symbol)) {
5085 warningf(pos, "no previous prototype for '%#T'",
5088 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5089 new_storage_class = STORAGE_CLASS_EXTERN;
5098 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5099 new_storage_class == STORAGE_CLASS_EXTERN) {
5100 warn_redundant_declaration:
5101 if (!is_definition &&
5102 warning.redundant_decls &&
5103 is_type_valid(prev_type) &&
5104 strcmp(previous_entity->base.source_position.input_name,
5105 "<builtin>") != 0) {
5107 "redundant declaration for '%Y' (declared %P)",
5108 symbol, &previous_entity->base.source_position);
5110 } else if (current_function == NULL) {
5111 if (old_storage_class != STORAGE_CLASS_STATIC &&
5112 new_storage_class == STORAGE_CLASS_STATIC) {
5114 "static declaration of '%Y' follows non-static declaration (declared %P)",
5115 symbol, &previous_entity->base.source_position);
5116 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5117 prev_decl->storage_class = STORAGE_CLASS_NONE;
5118 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
5120 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5122 goto error_redeclaration;
5123 goto warn_redundant_declaration;
5125 } else if (is_type_valid(prev_type)) {
5126 if (old_storage_class == new_storage_class) {
5127 error_redeclaration:
5128 errorf(pos, "redeclaration of '%Y' (declared %P)",
5129 symbol, &previous_entity->base.source_position);
5132 "redeclaration of '%Y' with different linkage (declared %P)",
5133 symbol, &previous_entity->base.source_position);
5138 prev_decl->modifiers |= decl->modifiers;
5139 if (entity->kind == ENTITY_FUNCTION) {
5140 previous_entity->function.is_inline |= entity->function.is_inline;
5142 return previous_entity;
5145 if (entity->kind == ENTITY_FUNCTION) {
5146 if (is_definition &&
5147 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5148 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5149 warningf(pos, "no previous prototype for '%#T'",
5150 entity->declaration.type, symbol);
5151 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5152 warningf(pos, "no previous declaration for '%#T'",
5153 entity->declaration.type, symbol);
5156 } else if (warning.missing_declarations &&
5157 entity->kind == ENTITY_VARIABLE &&
5158 current_scope == file_scope) {
5159 declaration_t *declaration = &entity->declaration;
5160 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5161 warningf(pos, "no previous declaration for '%#T'",
5162 declaration->type, symbol);
5167 assert(entity->base.parent_scope == NULL);
5168 assert(current_scope != NULL);
5170 entity->base.parent_scope = current_scope;
5171 entity->base.namespc = NAMESPACE_NORMAL;
5172 environment_push(entity);
5173 append_entity(current_scope, entity);
5178 static void parser_error_multiple_definition(entity_t *entity,
5179 const source_position_t *source_position)
5181 errorf(source_position, "multiple definition of '%Y' (declared %P)",
5182 entity->base.symbol, &entity->base.source_position);
5185 static bool is_declaration_specifier(const token_t *token,
5186 bool only_specifiers_qualifiers)
5188 switch (token->type) {
5193 return is_typedef_symbol(token->v.symbol);
5195 case T___extension__:
5197 return !only_specifiers_qualifiers;
5204 static void parse_init_declarator_rest(entity_t *entity)
5206 assert(is_declaration(entity));
5207 declaration_t *const declaration = &entity->declaration;
5211 type_t *orig_type = declaration->type;
5212 type_t *type = skip_typeref(orig_type);
5214 if (entity->kind == ENTITY_VARIABLE
5215 && entity->variable.initializer != NULL) {
5216 parser_error_multiple_definition(entity, HERE);
5219 bool must_be_constant = false;
5220 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5221 entity->base.parent_scope == file_scope) {
5222 must_be_constant = true;
5225 if (is_type_function(type)) {
5226 errorf(&entity->base.source_position,
5227 "function '%#T' is initialized like a variable",
5228 orig_type, entity->base.symbol);
5229 orig_type = type_error_type;
5232 parse_initializer_env_t env;
5233 env.type = orig_type;
5234 env.must_be_constant = must_be_constant;
5235 env.entity = entity;
5236 current_init_decl = entity;
5238 initializer_t *initializer = parse_initializer(&env);
5239 current_init_decl = NULL;
5241 if (entity->kind == ENTITY_VARIABLE) {
5242 /* § 6.7.5 (22) array initializers for arrays with unknown size
5243 * determine the array type size */
5244 declaration->type = env.type;
5245 entity->variable.initializer = initializer;
5249 /* parse rest of a declaration without any declarator */
5250 static void parse_anonymous_declaration_rest(
5251 const declaration_specifiers_t *specifiers)
5254 anonymous_entity = NULL;
5256 if (warning.other) {
5257 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5258 specifiers->thread_local) {
5259 warningf(&specifiers->source_position,
5260 "useless storage class in empty declaration");
5263 type_t *type = specifiers->type;
5264 switch (type->kind) {
5265 case TYPE_COMPOUND_STRUCT:
5266 case TYPE_COMPOUND_UNION: {
5267 if (type->compound.compound->base.symbol == NULL) {
5268 warningf(&specifiers->source_position,
5269 "unnamed struct/union that defines no instances");
5278 warningf(&specifiers->source_position, "empty declaration");
5284 static void check_variable_type_complete(entity_t *ent)
5286 if (ent->kind != ENTITY_VARIABLE)
5289 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5290 * type for the object shall be complete [...] */
5291 declaration_t *decl = &ent->declaration;
5292 if (decl->storage_class != STORAGE_CLASS_NONE)
5295 type_t *const orig_type = decl->type;
5296 type_t *const type = skip_typeref(orig_type);
5297 if (!is_type_incomplete(type))
5300 /* GCC allows global arrays without size and assigns them a length of one,
5301 * if no different declaration follows */
5302 if (is_type_array(type) &&
5304 ent->base.parent_scope == file_scope) {
5305 ARR_APP1(declaration_t*, incomplete_arrays, decl);
5309 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5310 orig_type, ent->base.symbol);
5314 static void parse_declaration_rest(entity_t *ndeclaration,
5315 const declaration_specifiers_t *specifiers,
5316 parsed_declaration_func finished_declaration,
5317 declarator_flags_t flags)
5319 add_anchor_token(';');
5320 add_anchor_token(',');
5322 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5324 if (token.type == '=') {
5325 parse_init_declarator_rest(entity);
5326 } else if (entity->kind == ENTITY_VARIABLE) {
5327 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5328 * [...] where the extern specifier is explicitly used. */
5329 declaration_t *decl = &entity->declaration;
5330 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5331 type_t *type = decl->type;
5332 if (is_type_reference(skip_typeref(type))) {
5333 errorf(&entity->base.source_position,
5334 "reference '%#T' must be initialized",
5335 type, entity->base.symbol);
5340 check_variable_type_complete(entity);
5342 if (token.type != ',')
5346 add_anchor_token('=');
5347 ndeclaration = parse_declarator(specifiers, flags);
5348 rem_anchor_token('=');
5350 expect(';', end_error);
5353 anonymous_entity = NULL;
5354 rem_anchor_token(';');
5355 rem_anchor_token(',');
5358 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5360 symbol_t *symbol = entity->base.symbol;
5361 if (symbol == NULL) {
5362 errorf(HERE, "anonymous declaration not valid as function parameter");
5366 assert(entity->base.namespc == NAMESPACE_NORMAL);
5367 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5368 if (previous_entity == NULL
5369 || previous_entity->base.parent_scope != current_scope) {
5370 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5375 if (is_definition) {
5376 errorf(HERE, "parameter '%Y' is initialised", entity->base.symbol);
5379 return record_entity(entity, false);
5382 static void parse_declaration(parsed_declaration_func finished_declaration,
5383 declarator_flags_t flags)
5385 declaration_specifiers_t specifiers;
5386 memset(&specifiers, 0, sizeof(specifiers));
5388 add_anchor_token(';');
5389 parse_declaration_specifiers(&specifiers);
5390 rem_anchor_token(';');
5392 if (token.type == ';') {
5393 parse_anonymous_declaration_rest(&specifiers);
5395 entity_t *entity = parse_declarator(&specifiers, flags);
5396 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5400 static type_t *get_default_promoted_type(type_t *orig_type)
5402 type_t *result = orig_type;
5404 type_t *type = skip_typeref(orig_type);
5405 if (is_type_integer(type)) {
5406 result = promote_integer(type);
5407 } else if (type == type_float) {
5408 result = type_double;
5414 static void parse_kr_declaration_list(entity_t *entity)
5416 if (entity->kind != ENTITY_FUNCTION)
5419 type_t *type = skip_typeref(entity->declaration.type);
5420 assert(is_type_function(type));
5421 if (!type->function.kr_style_parameters)
5425 add_anchor_token('{');
5427 /* push function parameters */
5428 size_t const top = environment_top();
5429 scope_t *old_scope = scope_push(&entity->function.parameters);
5431 entity_t *parameter = entity->function.parameters.entities;
5432 for ( ; parameter != NULL; parameter = parameter->base.next) {
5433 assert(parameter->base.parent_scope == NULL);
5434 parameter->base.parent_scope = current_scope;
5435 environment_push(parameter);
5438 /* parse declaration list */
5440 switch (token.type) {
5442 case T___extension__:
5443 /* This covers symbols, which are no type, too, and results in
5444 * better error messages. The typical cases are misspelled type
5445 * names and missing includes. */
5447 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5455 /* pop function parameters */
5456 assert(current_scope == &entity->function.parameters);
5457 scope_pop(old_scope);
5458 environment_pop_to(top);
5460 /* update function type */
5461 type_t *new_type = duplicate_type(type);
5463 function_parameter_t *parameters = NULL;
5464 function_parameter_t *last_parameter = NULL;
5466 parameter = entity->function.parameters.entities;
5467 for (; parameter != NULL; parameter = parameter->base.next) {
5468 type_t *parameter_type = parameter->declaration.type;
5469 if (parameter_type == NULL) {
5471 errorf(HERE, "no type specified for function parameter '%Y'",
5472 parameter->base.symbol);
5474 if (warning.implicit_int) {
5475 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5476 parameter->base.symbol);
5478 parameter_type = type_int;
5479 parameter->declaration.type = parameter_type;
5483 semantic_parameter_incomplete(parameter);
5484 parameter_type = parameter->declaration.type;
5487 * we need the default promoted types for the function type
5489 parameter_type = get_default_promoted_type(parameter_type);
5491 function_parameter_t *function_parameter
5492 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5493 memset(function_parameter, 0, sizeof(function_parameter[0]));
5495 function_parameter->type = parameter_type;
5496 if (last_parameter != NULL) {
5497 last_parameter->next = function_parameter;
5499 parameters = function_parameter;
5501 last_parameter = function_parameter;
5504 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5506 new_type->function.parameters = parameters;
5507 new_type->function.unspecified_parameters = true;
5509 type = typehash_insert(new_type);
5510 if (type != new_type) {
5511 obstack_free(type_obst, new_type);
5514 entity->declaration.type = type;
5516 rem_anchor_token('{');
5519 static bool first_err = true;
5522 * When called with first_err set, prints the name of the current function,
5525 static void print_in_function(void)
5529 diagnosticf("%s: In function '%Y':\n",
5530 current_function->base.base.source_position.input_name,
5531 current_function->base.base.symbol);
5536 * Check if all labels are defined in the current function.
5537 * Check if all labels are used in the current function.
5539 static void check_labels(void)
5541 for (const goto_statement_t *goto_statement = goto_first;
5542 goto_statement != NULL;
5543 goto_statement = goto_statement->next) {
5544 /* skip computed gotos */
5545 if (goto_statement->expression != NULL)
5548 label_t *label = goto_statement->label;
5551 if (label->base.source_position.input_name == NULL) {
5552 print_in_function();
5553 errorf(&goto_statement->base.source_position,
5554 "label '%Y' used but not defined", label->base.symbol);
5558 if (warning.unused_label) {
5559 for (const label_statement_t *label_statement = label_first;
5560 label_statement != NULL;
5561 label_statement = label_statement->next) {
5562 label_t *label = label_statement->label;
5564 if (! label->used) {
5565 print_in_function();
5566 warningf(&label_statement->base.source_position,
5567 "label '%Y' defined but not used", label->base.symbol);
5573 static void warn_unused_entity(entity_t *entity, entity_t *end)
5575 for (; entity != NULL; entity = entity->base.next) {
5576 if (!is_declaration(entity))
5579 declaration_t *declaration = &entity->declaration;
5580 if (declaration->implicit)
5583 if (!declaration->used) {
5584 print_in_function();
5585 const char *what = get_entity_kind_name(entity->kind);
5586 warningf(&entity->base.source_position, "%s '%Y' is unused",
5587 what, entity->base.symbol);
5588 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5589 print_in_function();
5590 const char *what = get_entity_kind_name(entity->kind);
5591 warningf(&entity->base.source_position, "%s '%Y' is never read",
5592 what, entity->base.symbol);
5600 static void check_unused_variables(statement_t *const stmt, void *const env)
5604 switch (stmt->kind) {
5605 case STATEMENT_DECLARATION: {
5606 declaration_statement_t const *const decls = &stmt->declaration;
5607 warn_unused_entity(decls->declarations_begin,
5608 decls->declarations_end);
5613 warn_unused_entity(stmt->fors.scope.entities, NULL);
5622 * Check declarations of current_function for unused entities.
5624 static void check_declarations(void)
5626 if (warning.unused_parameter) {
5627 const scope_t *scope = ¤t_function->parameters;
5629 /* do not issue unused warnings for main */
5630 if (!is_sym_main(current_function->base.base.symbol)) {
5631 warn_unused_entity(scope->entities, NULL);
5634 if (warning.unused_variable) {
5635 walk_statements(current_function->statement, check_unused_variables,
5640 static int determine_truth(expression_t const* const cond)
5643 !is_constant_expression(cond) ? 0 :
5644 fold_constant(cond) != 0 ? 1 :
5648 static void check_reachable(statement_t *);
5650 static bool expression_returns(expression_t const *const expr)
5652 switch (expr->kind) {
5654 expression_t const *const func = expr->call.function;
5655 if (func->kind == EXPR_REFERENCE) {
5656 entity_t *entity = func->reference.entity;
5657 if (entity->kind == ENTITY_FUNCTION
5658 && entity->declaration.modifiers & DM_NORETURN)
5662 if (!expression_returns(func))
5665 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5666 if (!expression_returns(arg->expression))
5673 case EXPR_REFERENCE:
5674 case EXPR_REFERENCE_ENUM_VALUE:
5676 case EXPR_CHARACTER_CONSTANT:
5677 case EXPR_WIDE_CHARACTER_CONSTANT:
5678 case EXPR_STRING_LITERAL:
5679 case EXPR_WIDE_STRING_LITERAL:
5680 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5681 case EXPR_LABEL_ADDRESS:
5682 case EXPR_CLASSIFY_TYPE:
5683 case EXPR_SIZEOF: // TODO handle obscure VLA case
5686 case EXPR_BUILTIN_SYMBOL:
5687 case EXPR_BUILTIN_CONSTANT_P:
5688 case EXPR_BUILTIN_PREFETCH:
5693 case EXPR_STATEMENT:
5694 check_reachable(expr->statement.statement);
5695 // TODO check if statement can be left
5698 case EXPR_CONDITIONAL:
5699 // TODO handle constant expression
5701 if (!expression_returns(expr->conditional.condition))
5704 if (expr->conditional.true_expression != NULL
5705 && expression_returns(expr->conditional.true_expression))
5708 return expression_returns(expr->conditional.false_expression);
5711 return expression_returns(expr->select.compound);
5713 case EXPR_ARRAY_ACCESS:
5715 expression_returns(expr->array_access.array_ref) &&
5716 expression_returns(expr->array_access.index);
5719 return expression_returns(expr->va_starte.ap);
5722 return expression_returns(expr->va_arge.ap);
5724 EXPR_UNARY_CASES_MANDATORY
5725 return expression_returns(expr->unary.value);
5727 case EXPR_UNARY_THROW:
5731 // TODO handle constant lhs of && and ||
5733 expression_returns(expr->binary.left) &&
5734 expression_returns(expr->binary.right);
5740 panic("unhandled expression");
5743 static bool initializer_returns(initializer_t const *const init)
5745 switch (init->kind) {
5746 case INITIALIZER_VALUE:
5747 return expression_returns(init->value.value);
5749 case INITIALIZER_LIST: {
5750 initializer_t * const* i = init->list.initializers;
5751 initializer_t * const* const end = i + init->list.len;
5752 bool returns = true;
5753 for (; i != end; ++i) {
5754 if (!initializer_returns(*i))
5760 case INITIALIZER_STRING:
5761 case INITIALIZER_WIDE_STRING:
5762 case INITIALIZER_DESIGNATOR: // designators have no payload
5765 panic("unhandled initializer");
5768 static bool noreturn_candidate;
5770 static void check_reachable(statement_t *const stmt)
5772 if (stmt->base.reachable)
5774 if (stmt->kind != STATEMENT_DO_WHILE)
5775 stmt->base.reachable = true;
5777 statement_t *last = stmt;
5779 switch (stmt->kind) {
5780 case STATEMENT_INVALID:
5781 case STATEMENT_EMPTY:
5782 case STATEMENT_LOCAL_LABEL:
5784 next = stmt->base.next;
5787 case STATEMENT_DECLARATION: {
5788 declaration_statement_t const *const decl = &stmt->declaration;
5789 entity_t const * ent = decl->declarations_begin;
5790 entity_t const *const last = decl->declarations_end;
5792 for (;; ent = ent->base.next) {
5793 if (ent->kind == ENTITY_VARIABLE &&
5794 ent->variable.initializer != NULL &&
5795 !initializer_returns(ent->variable.initializer)) {
5802 next = stmt->base.next;
5806 case STATEMENT_COMPOUND:
5807 next = stmt->compound.statements;
5810 case STATEMENT_RETURN: {
5811 expression_t const *const val = stmt->returns.value;
5812 if (val == NULL || expression_returns(val))
5813 noreturn_candidate = false;
5817 case STATEMENT_IF: {
5818 if_statement_t const *const ifs = &stmt->ifs;
5819 expression_t const *const cond = ifs->condition;
5821 if (!expression_returns(cond))
5824 int const val = determine_truth(cond);
5827 check_reachable(ifs->true_statement);
5832 if (ifs->false_statement != NULL) {
5833 check_reachable(ifs->false_statement);
5837 next = stmt->base.next;
5841 case STATEMENT_SWITCH: {
5842 switch_statement_t const *const switchs = &stmt->switchs;
5843 expression_t const *const expr = switchs->expression;
5845 if (!expression_returns(expr))
5848 if (is_constant_expression(expr)) {
5849 long const val = fold_constant(expr);
5850 case_label_statement_t * defaults = NULL;
5851 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5852 if (i->expression == NULL) {
5857 if (i->first_case <= val && val <= i->last_case) {
5858 check_reachable((statement_t*)i);
5863 if (defaults != NULL) {
5864 check_reachable((statement_t*)defaults);
5868 bool has_default = false;
5869 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5870 if (i->expression == NULL)
5873 check_reachable((statement_t*)i);
5880 next = stmt->base.next;
5884 case STATEMENT_EXPRESSION: {
5885 /* Check for noreturn function call */
5886 expression_t const *const expr = stmt->expression.expression;
5887 if (!expression_returns(expr))
5890 next = stmt->base.next;
5894 case STATEMENT_CONTINUE: {
5895 statement_t *parent = stmt;
5897 parent = parent->base.parent;
5898 if (parent == NULL) /* continue not within loop */
5902 switch (parent->kind) {
5903 case STATEMENT_WHILE: goto continue_while;
5904 case STATEMENT_DO_WHILE: goto continue_do_while;
5905 case STATEMENT_FOR: goto continue_for;
5912 case STATEMENT_BREAK: {
5913 statement_t *parent = stmt;
5915 parent = parent->base.parent;
5916 if (parent == NULL) /* break not within loop/switch */
5919 switch (parent->kind) {
5920 case STATEMENT_SWITCH:
5921 case STATEMENT_WHILE:
5922 case STATEMENT_DO_WHILE:
5925 next = parent->base.next;
5926 goto found_break_parent;
5935 case STATEMENT_GOTO:
5936 if (stmt->gotos.expression) {
5937 if (!expression_returns(stmt->gotos.expression))
5940 statement_t *parent = stmt->base.parent;
5941 if (parent == NULL) /* top level goto */
5945 next = stmt->gotos.label->statement;
5946 if (next == NULL) /* missing label */
5951 case STATEMENT_LABEL:
5952 next = stmt->label.statement;
5955 case STATEMENT_CASE_LABEL:
5956 next = stmt->case_label.statement;
5959 case STATEMENT_WHILE: {
5960 while_statement_t const *const whiles = &stmt->whiles;
5961 expression_t const *const cond = whiles->condition;
5963 if (!expression_returns(cond))
5966 int const val = determine_truth(cond);
5969 check_reachable(whiles->body);
5974 next = stmt->base.next;
5978 case STATEMENT_DO_WHILE:
5979 next = stmt->do_while.body;
5982 case STATEMENT_FOR: {
5983 for_statement_t *const fors = &stmt->fors;
5985 if (fors->condition_reachable)
5987 fors->condition_reachable = true;
5989 expression_t const *const cond = fors->condition;
5994 } else if (expression_returns(cond)) {
5995 val = determine_truth(cond);
6001 check_reachable(fors->body);
6006 next = stmt->base.next;
6010 case STATEMENT_MS_TRY: {
6011 ms_try_statement_t const *const ms_try = &stmt->ms_try;
6012 check_reachable(ms_try->try_statement);
6013 next = ms_try->final_statement;
6017 case STATEMENT_LEAVE: {
6018 statement_t *parent = stmt;
6020 parent = parent->base.parent;
6021 if (parent == NULL) /* __leave not within __try */
6024 if (parent->kind == STATEMENT_MS_TRY) {
6026 next = parent->ms_try.final_statement;
6034 while (next == NULL) {
6035 next = last->base.parent;
6037 noreturn_candidate = false;
6039 type_t *const type = current_function->base.type;
6040 assert(is_type_function(type));
6041 type_t *const ret = skip_typeref(type->function.return_type);
6042 if (warning.return_type &&
6043 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
6044 is_type_valid(ret) &&
6045 !is_sym_main(current_function->base.base.symbol)) {
6046 warningf(&stmt->base.source_position,
6047 "control reaches end of non-void function");
6052 switch (next->kind) {
6053 case STATEMENT_INVALID:
6054 case STATEMENT_EMPTY:
6055 case STATEMENT_DECLARATION:
6056 case STATEMENT_LOCAL_LABEL:
6057 case STATEMENT_EXPRESSION:
6059 case STATEMENT_RETURN:
6060 case STATEMENT_CONTINUE:
6061 case STATEMENT_BREAK:
6062 case STATEMENT_GOTO:
6063 case STATEMENT_LEAVE:
6064 panic("invalid control flow in function");
6066 case STATEMENT_COMPOUND:
6068 case STATEMENT_SWITCH:
6069 case STATEMENT_LABEL:
6070 case STATEMENT_CASE_LABEL:
6072 next = next->base.next;
6075 case STATEMENT_WHILE: {
6077 if (next->base.reachable)
6079 next->base.reachable = true;
6081 while_statement_t const *const whiles = &next->whiles;
6082 expression_t const *const cond = whiles->condition;
6084 if (!expression_returns(cond))
6087 int const val = determine_truth(cond);
6090 check_reachable(whiles->body);
6096 next = next->base.next;
6100 case STATEMENT_DO_WHILE: {
6102 if (next->base.reachable)
6104 next->base.reachable = true;
6106 do_while_statement_t const *const dw = &next->do_while;
6107 expression_t const *const cond = dw->condition;
6109 if (!expression_returns(cond))
6112 int const val = determine_truth(cond);
6115 check_reachable(dw->body);
6121 next = next->base.next;
6125 case STATEMENT_FOR: {
6127 for_statement_t *const fors = &next->fors;
6129 fors->step_reachable = true;
6131 if (fors->condition_reachable)
6133 fors->condition_reachable = true;
6135 expression_t const *const cond = fors->condition;
6140 } else if (expression_returns(cond)) {
6141 val = determine_truth(cond);
6147 check_reachable(fors->body);
6153 next = next->base.next;
6157 case STATEMENT_MS_TRY:
6159 next = next->ms_try.final_statement;
6164 check_reachable(next);
6167 static void check_unreachable(statement_t* const stmt, void *const env)
6171 switch (stmt->kind) {
6172 case STATEMENT_DO_WHILE:
6173 if (!stmt->base.reachable) {
6174 expression_t const *const cond = stmt->do_while.condition;
6175 if (determine_truth(cond) >= 0) {
6176 warningf(&cond->base.source_position,
6177 "condition of do-while-loop is unreachable");
6182 case STATEMENT_FOR: {
6183 for_statement_t const* const fors = &stmt->fors;
6185 // if init and step are unreachable, cond is unreachable, too
6186 if (!stmt->base.reachable && !fors->step_reachable) {
6187 warningf(&stmt->base.source_position, "statement is unreachable");
6189 if (!stmt->base.reachable && fors->initialisation != NULL) {
6190 warningf(&fors->initialisation->base.source_position,
6191 "initialisation of for-statement is unreachable");
6194 if (!fors->condition_reachable && fors->condition != NULL) {
6195 warningf(&fors->condition->base.source_position,
6196 "condition of for-statement is unreachable");
6199 if (!fors->step_reachable && fors->step != NULL) {
6200 warningf(&fors->step->base.source_position,
6201 "step of for-statement is unreachable");
6207 case STATEMENT_COMPOUND:
6208 if (stmt->compound.statements != NULL)
6210 goto warn_unreachable;
6212 case STATEMENT_DECLARATION: {
6213 /* Only warn if there is at least one declarator with an initializer.
6214 * This typically occurs in switch statements. */
6215 declaration_statement_t const *const decl = &stmt->declaration;
6216 entity_t const * ent = decl->declarations_begin;
6217 entity_t const *const last = decl->declarations_end;
6218 for (;; ent = ent->base.next) {
6219 if (ent->kind == ENTITY_VARIABLE &&
6220 ent->variable.initializer != NULL) {
6221 goto warn_unreachable;
6230 if (!stmt->base.reachable)
6231 warningf(&stmt->base.source_position, "statement is unreachable");
6236 static void parse_external_declaration(void)
6238 /* function-definitions and declarations both start with declaration
6240 declaration_specifiers_t specifiers;
6241 memset(&specifiers, 0, sizeof(specifiers));
6243 add_anchor_token(';');
6244 parse_declaration_specifiers(&specifiers);
6245 rem_anchor_token(';');
6247 /* must be a declaration */
6248 if (token.type == ';') {
6249 parse_anonymous_declaration_rest(&specifiers);
6253 add_anchor_token(',');
6254 add_anchor_token('=');
6255 add_anchor_token(';');
6256 add_anchor_token('{');
6258 /* declarator is common to both function-definitions and declarations */
6259 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6261 rem_anchor_token('{');
6262 rem_anchor_token(';');
6263 rem_anchor_token('=');
6264 rem_anchor_token(',');
6266 /* must be a declaration */
6267 switch (token.type) {
6271 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6276 /* must be a function definition */
6277 parse_kr_declaration_list(ndeclaration);
6279 if (token.type != '{') {
6280 parse_error_expected("while parsing function definition", '{', NULL);
6281 eat_until_matching_token(';');
6285 assert(is_declaration(ndeclaration));
6286 type_t *type = skip_typeref(ndeclaration->declaration.type);
6288 if (!is_type_function(type)) {
6289 if (is_type_valid(type)) {
6290 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6291 type, ndeclaration->base.symbol);
6297 if (warning.aggregate_return &&
6298 is_type_compound(skip_typeref(type->function.return_type))) {
6299 warningf(HERE, "function '%Y' returns an aggregate",
6300 ndeclaration->base.symbol);
6302 if (warning.traditional && !type->function.unspecified_parameters) {
6303 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6304 ndeclaration->base.symbol);
6306 if (warning.old_style_definition && type->function.unspecified_parameters) {
6307 warningf(HERE, "old-style function definition '%Y'",
6308 ndeclaration->base.symbol);
6311 /* § 6.7.5.3 (14) a function definition with () means no
6312 * parameters (and not unspecified parameters) */
6313 if (type->function.unspecified_parameters
6314 && type->function.parameters == NULL
6315 && !type->function.kr_style_parameters) {
6316 type_t *duplicate = duplicate_type(type);
6317 duplicate->function.unspecified_parameters = false;
6319 type = typehash_insert(duplicate);
6320 if (type != duplicate) {
6321 obstack_free(type_obst, duplicate);
6323 ndeclaration->declaration.type = type;
6326 entity_t *const entity = record_entity(ndeclaration, true);
6327 assert(entity->kind == ENTITY_FUNCTION);
6328 assert(ndeclaration->kind == ENTITY_FUNCTION);
6330 function_t *function = &entity->function;
6331 if (ndeclaration != entity) {
6332 function->parameters = ndeclaration->function.parameters;
6334 assert(is_declaration(entity));
6335 type = skip_typeref(entity->declaration.type);
6337 /* push function parameters and switch scope */
6338 size_t const top = environment_top();
6339 scope_t *old_scope = scope_push(&function->parameters);
6341 entity_t *parameter = function->parameters.entities;
6342 for (; parameter != NULL; parameter = parameter->base.next) {
6343 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6344 parameter->base.parent_scope = current_scope;
6346 assert(parameter->base.parent_scope == NULL
6347 || parameter->base.parent_scope == current_scope);
6348 parameter->base.parent_scope = current_scope;
6349 if (parameter->base.symbol == NULL) {
6350 errorf(¶meter->base.source_position, "parameter name omitted");
6353 environment_push(parameter);
6356 if (function->statement != NULL) {
6357 parser_error_multiple_definition(entity, HERE);
6360 /* parse function body */
6361 int label_stack_top = label_top();
6362 function_t *old_current_function = current_function;
6363 current_function = function;
6364 current_parent = NULL;
6367 goto_anchor = &goto_first;
6369 label_anchor = &label_first;
6371 statement_t *const body = parse_compound_statement(false);
6372 function->statement = body;
6375 check_declarations();
6376 if (warning.return_type ||
6377 warning.unreachable_code ||
6378 (warning.missing_noreturn
6379 && !(function->base.modifiers & DM_NORETURN))) {
6380 noreturn_candidate = true;
6381 check_reachable(body);
6382 if (warning.unreachable_code)
6383 walk_statements(body, check_unreachable, NULL);
6384 if (warning.missing_noreturn &&
6385 noreturn_candidate &&
6386 !(function->base.modifiers & DM_NORETURN)) {
6387 warningf(&body->base.source_position,
6388 "function '%#T' is candidate for attribute 'noreturn'",
6389 type, entity->base.symbol);
6393 assert(current_parent == NULL);
6394 assert(current_function == function);
6395 current_function = old_current_function;
6396 label_pop_to(label_stack_top);
6399 assert(current_scope == &function->parameters);
6400 scope_pop(old_scope);
6401 environment_pop_to(top);
6404 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6405 source_position_t *source_position,
6406 const symbol_t *symbol)
6408 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6410 type->bitfield.base_type = base_type;
6411 type->bitfield.size_expression = size;
6414 type_t *skipped_type = skip_typeref(base_type);
6415 if (!is_type_integer(skipped_type)) {
6416 errorf(HERE, "bitfield base type '%T' is not an integer type",
6420 bit_size = skipped_type->base.size * 8;
6423 if (is_constant_expression(size)) {
6424 long v = fold_constant(size);
6427 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6428 } else if (v == 0) {
6429 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6430 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6431 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6433 type->bitfield.bit_size = v;
6440 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6442 entity_t *iter = compound->members.entities;
6443 for (; iter != NULL; iter = iter->base.next) {
6444 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6447 if (iter->base.symbol == symbol) {
6449 } else if (iter->base.symbol == NULL) {
6450 type_t *type = skip_typeref(iter->declaration.type);
6451 if (is_type_compound(type)) {
6453 = find_compound_entry(type->compound.compound, symbol);
6464 static void parse_compound_declarators(compound_t *compound,
6465 const declaration_specifiers_t *specifiers)
6470 if (token.type == ':') {
6471 source_position_t source_position = *HERE;
6474 type_t *base_type = specifiers->type;
6475 expression_t *size = parse_constant_expression();
6477 type_t *type = make_bitfield_type(base_type, size,
6478 &source_position, sym_anonymous);
6480 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6481 entity->base.namespc = NAMESPACE_NORMAL;
6482 entity->base.source_position = source_position;
6483 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6484 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6485 entity->declaration.modifiers = specifiers->modifiers;
6486 entity->declaration.type = type;
6488 entity = parse_declarator(specifiers,
6489 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6490 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6492 if (token.type == ':') {
6493 source_position_t source_position = *HERE;
6495 expression_t *size = parse_constant_expression();
6497 type_t *type = entity->declaration.type;
6498 type_t *bitfield_type = make_bitfield_type(type, size,
6499 &source_position, entity->base.symbol);
6500 entity->declaration.type = bitfield_type;
6504 /* make sure we don't define a symbol multiple times */
6505 symbol_t *symbol = entity->base.symbol;
6506 if (symbol != NULL) {
6507 entity_t *prev = find_compound_entry(compound, symbol);
6510 errorf(&entity->base.source_position,
6511 "multiple declarations of symbol '%Y' (declared %P)",
6512 symbol, &prev->base.source_position);
6516 append_entity(&compound->members, entity);
6518 type_t *orig_type = entity->declaration.type;
6519 type_t *type = skip_typeref(orig_type);
6520 if (is_type_function(type)) {
6521 errorf(&entity->base.source_position,
6522 "compound member '%Y' must not have function type '%T'",
6523 entity->base.symbol, orig_type);
6524 } else if (is_type_incomplete(type)) {
6525 /* §6.7.2.1:16 flexible array member */
6526 if (is_type_array(type) &&
6527 token.type == ';' &&
6528 look_ahead(1)->type == '}') {
6529 compound->has_flexible_member = true;
6531 errorf(&entity->base.source_position,
6532 "compound member '%Y' has incomplete type '%T'",
6533 entity->base.symbol, orig_type);
6537 if (token.type != ',')
6541 expect(';', end_error);
6544 anonymous_entity = NULL;
6547 static void parse_compound_type_entries(compound_t *compound)
6550 add_anchor_token('}');
6552 while (token.type != '}') {
6553 if (token.type == T_EOF) {
6554 errorf(HERE, "EOF while parsing struct");
6557 declaration_specifiers_t specifiers;
6558 memset(&specifiers, 0, sizeof(specifiers));
6559 parse_declaration_specifiers(&specifiers);
6561 parse_compound_declarators(compound, &specifiers);
6563 rem_anchor_token('}');
6567 compound->complete = true;
6570 static type_t *parse_typename(void)
6572 declaration_specifiers_t specifiers;
6573 memset(&specifiers, 0, sizeof(specifiers));
6574 parse_declaration_specifiers(&specifiers);
6575 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6576 specifiers.thread_local) {
6577 /* TODO: improve error message, user does probably not know what a
6578 * storage class is...
6580 errorf(HERE, "typename may not have a storage class");
6583 type_t *result = parse_abstract_declarator(specifiers.type);
6591 typedef expression_t* (*parse_expression_function)(void);
6592 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6594 typedef struct expression_parser_function_t expression_parser_function_t;
6595 struct expression_parser_function_t {
6596 parse_expression_function parser;
6597 unsigned infix_precedence;
6598 parse_expression_infix_function infix_parser;
6601 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6604 * Prints an error message if an expression was expected but not read
6606 static expression_t *expected_expression_error(void)
6608 /* skip the error message if the error token was read */
6609 if (token.type != T_ERROR) {
6610 errorf(HERE, "expected expression, got token %K", &token);
6614 return create_invalid_expression();
6618 * Parse a string constant.
6620 static expression_t *parse_string_const(void)
6623 if (token.type == T_STRING_LITERAL) {
6624 string_t res = token.v.string;
6626 while (token.type == T_STRING_LITERAL) {
6627 res = concat_strings(&res, &token.v.string);
6630 if (token.type != T_WIDE_STRING_LITERAL) {
6631 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6632 /* note: that we use type_char_ptr here, which is already the
6633 * automatic converted type. revert_automatic_type_conversion
6634 * will construct the array type */
6635 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6636 cnst->string.value = res;
6640 wres = concat_string_wide_string(&res, &token.v.wide_string);
6642 wres = token.v.wide_string;
6647 switch (token.type) {
6648 case T_WIDE_STRING_LITERAL:
6649 wres = concat_wide_strings(&wres, &token.v.wide_string);
6652 case T_STRING_LITERAL:
6653 wres = concat_wide_string_string(&wres, &token.v.string);
6657 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6658 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6659 cnst->wide_string.value = wres;
6668 * Parse a boolean constant.
6670 static expression_t *parse_bool_const(bool value)
6672 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6673 cnst->base.type = type_bool;
6674 cnst->conste.v.int_value = value;
6682 * Parse an integer constant.
6684 static expression_t *parse_int_const(void)
6686 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6687 cnst->base.type = token.datatype;
6688 cnst->conste.v.int_value = token.v.intvalue;
6696 * Parse a character constant.
6698 static expression_t *parse_character_constant(void)
6700 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6701 cnst->base.type = token.datatype;
6702 cnst->conste.v.character = token.v.string;
6704 if (cnst->conste.v.character.size != 1) {
6706 errorf(HERE, "more than 1 character in character constant");
6707 } else if (warning.multichar) {
6708 warningf(HERE, "multi-character character constant");
6717 * Parse a wide character constant.
6719 static expression_t *parse_wide_character_constant(void)
6721 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6722 cnst->base.type = token.datatype;
6723 cnst->conste.v.wide_character = token.v.wide_string;
6725 if (cnst->conste.v.wide_character.size != 1) {
6727 errorf(HERE, "more than 1 character in character constant");
6728 } else if (warning.multichar) {
6729 warningf(HERE, "multi-character character constant");
6738 * Parse a float constant.
6740 static expression_t *parse_float_const(void)
6742 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6743 cnst->base.type = token.datatype;
6744 cnst->conste.v.float_value = token.v.floatvalue;
6751 static entity_t *create_implicit_function(symbol_t *symbol,
6752 const source_position_t *source_position)
6754 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6755 ntype->function.return_type = type_int;
6756 ntype->function.unspecified_parameters = true;
6758 type_t *type = typehash_insert(ntype);
6759 if (type != ntype) {
6763 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6764 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6765 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6766 entity->declaration.type = type;
6767 entity->declaration.implicit = true;
6768 entity->base.symbol = symbol;
6769 entity->base.source_position = *source_position;
6771 bool strict_prototypes_old = warning.strict_prototypes;
6772 warning.strict_prototypes = false;
6773 record_entity(entity, false);
6774 warning.strict_prototypes = strict_prototypes_old;
6780 * Creates a return_type (func)(argument_type) function type if not
6783 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6784 type_t *argument_type2)
6786 function_parameter_t *parameter2
6787 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6788 memset(parameter2, 0, sizeof(parameter2[0]));
6789 parameter2->type = argument_type2;
6791 function_parameter_t *parameter1
6792 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6793 memset(parameter1, 0, sizeof(parameter1[0]));
6794 parameter1->type = argument_type1;
6795 parameter1->next = parameter2;
6797 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6798 type->function.return_type = return_type;
6799 type->function.parameters = parameter1;
6801 type_t *result = typehash_insert(type);
6802 if (result != type) {
6810 * Creates a return_type (func)(argument_type) function type if not
6813 * @param return_type the return type
6814 * @param argument_type the argument type
6816 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6818 function_parameter_t *parameter
6819 = obstack_alloc(type_obst, sizeof(parameter[0]));
6820 memset(parameter, 0, sizeof(parameter[0]));
6821 parameter->type = argument_type;
6823 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6824 type->function.return_type = return_type;
6825 type->function.parameters = parameter;
6827 type_t *result = typehash_insert(type);
6828 if (result != type) {
6835 static type_t *make_function_0_type(type_t *return_type)
6837 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6838 type->function.return_type = return_type;
6839 type->function.parameters = NULL;
6841 type_t *result = typehash_insert(type);
6842 if (result != type) {
6850 * Creates a function type for some function like builtins.
6852 * @param symbol the symbol describing the builtin
6854 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6856 switch (symbol->ID) {
6857 case T___builtin_alloca:
6858 return make_function_1_type(type_void_ptr, type_size_t);
6859 case T___builtin_huge_val:
6860 return make_function_0_type(type_double);
6861 case T___builtin_inf:
6862 return make_function_0_type(type_double);
6863 case T___builtin_inff:
6864 return make_function_0_type(type_float);
6865 case T___builtin_infl:
6866 return make_function_0_type(type_long_double);
6867 case T___builtin_nan:
6868 return make_function_1_type(type_double, type_char_ptr);
6869 case T___builtin_nanf:
6870 return make_function_1_type(type_float, type_char_ptr);
6871 case T___builtin_nanl:
6872 return make_function_1_type(type_long_double, type_char_ptr);
6873 case T___builtin_va_end:
6874 return make_function_1_type(type_void, type_valist);
6875 case T___builtin_expect:
6876 return make_function_2_type(type_long, type_long, type_long);
6878 internal_errorf(HERE, "not implemented builtin identifier found");
6883 * Performs automatic type cast as described in § 6.3.2.1.
6885 * @param orig_type the original type
6887 static type_t *automatic_type_conversion(type_t *orig_type)
6889 type_t *type = skip_typeref(orig_type);
6890 if (is_type_array(type)) {
6891 array_type_t *array_type = &type->array;
6892 type_t *element_type = array_type->element_type;
6893 unsigned qualifiers = array_type->base.qualifiers;
6895 return make_pointer_type(element_type, qualifiers);
6898 if (is_type_function(type)) {
6899 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6906 * reverts the automatic casts of array to pointer types and function
6907 * to function-pointer types as defined § 6.3.2.1
6909 type_t *revert_automatic_type_conversion(const expression_t *expression)
6911 switch (expression->kind) {
6912 case EXPR_REFERENCE: {
6913 entity_t *entity = expression->reference.entity;
6914 if (is_declaration(entity)) {
6915 return entity->declaration.type;
6916 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6917 return entity->enum_value.enum_type;
6919 panic("no declaration or enum in reference");
6924 entity_t *entity = expression->select.compound_entry;
6925 assert(is_declaration(entity));
6926 type_t *type = entity->declaration.type;
6927 return get_qualified_type(type,
6928 expression->base.type->base.qualifiers);
6931 case EXPR_UNARY_DEREFERENCE: {
6932 const expression_t *const value = expression->unary.value;
6933 type_t *const type = skip_typeref(value->base.type);
6934 assert(is_type_pointer(type));
6935 return type->pointer.points_to;
6938 case EXPR_BUILTIN_SYMBOL:
6939 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6941 case EXPR_ARRAY_ACCESS: {
6942 const expression_t *array_ref = expression->array_access.array_ref;
6943 type_t *type_left = skip_typeref(array_ref->base.type);
6944 if (!is_type_valid(type_left))
6946 assert(is_type_pointer(type_left));
6947 return type_left->pointer.points_to;
6950 case EXPR_STRING_LITERAL: {
6951 size_t size = expression->string.value.size;
6952 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6955 case EXPR_WIDE_STRING_LITERAL: {
6956 size_t size = expression->wide_string.value.size;
6957 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6960 case EXPR_COMPOUND_LITERAL:
6961 return expression->compound_literal.type;
6966 return expression->base.type;
6969 static expression_t *parse_reference(void)
6971 symbol_t *const symbol = token.v.symbol;
6973 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6975 if (entity == NULL) {
6976 if (!strict_mode && look_ahead(1)->type == '(') {
6977 /* an implicitly declared function */
6978 if (warning.error_implicit_function_declaration) {
6979 errorf(HERE, "implicit declaration of function '%Y'", symbol);
6980 } else if (warning.implicit_function_declaration) {
6981 warningf(HERE, "implicit declaration of function '%Y'", symbol);
6984 entity = create_implicit_function(symbol, HERE);
6986 errorf(HERE, "unknown identifier '%Y' found.", symbol);
6987 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6993 if (is_declaration(entity)) {
6994 orig_type = entity->declaration.type;
6995 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6996 orig_type = entity->enum_value.enum_type;
6997 } else if (entity->kind == ENTITY_TYPEDEF) {
6998 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
7001 return create_invalid_expression();
7003 panic("expected declaration or enum value in reference");
7006 /* we always do the auto-type conversions; the & and sizeof parser contains
7007 * code to revert this! */
7008 type_t *type = automatic_type_conversion(orig_type);
7010 expression_kind_t kind = EXPR_REFERENCE;
7011 if (entity->kind == ENTITY_ENUM_VALUE)
7012 kind = EXPR_REFERENCE_ENUM_VALUE;
7014 expression_t *expression = allocate_expression_zero(kind);
7015 expression->reference.entity = entity;
7016 expression->base.type = type;
7018 /* this declaration is used */
7019 if (is_declaration(entity)) {
7020 entity->declaration.used = true;
7023 if (entity->base.parent_scope != file_scope
7024 && entity->base.parent_scope->depth < current_function->parameters.depth
7025 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
7026 if (entity->kind == ENTITY_VARIABLE) {
7027 /* access of a variable from an outer function */
7028 entity->variable.address_taken = true;
7029 } else if (entity->kind == ENTITY_PARAMETER) {
7030 entity->parameter.address_taken = true;
7032 current_function->need_closure = true;
7035 /* check for deprecated functions */
7036 if (warning.deprecated_declarations
7037 && is_declaration(entity)
7038 && entity->declaration.modifiers & DM_DEPRECATED) {
7039 declaration_t *declaration = &entity->declaration;
7041 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
7042 "function" : "variable";
7044 if (declaration->deprecated_string != NULL) {
7045 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
7046 prefix, entity->base.symbol, &entity->base.source_position,
7047 declaration->deprecated_string);
7049 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
7050 entity->base.symbol, &entity->base.source_position);
7054 if (warning.init_self && entity == current_init_decl && !in_type_prop
7055 && entity->kind == ENTITY_VARIABLE) {
7056 current_init_decl = NULL;
7057 warningf(HERE, "variable '%#T' is initialized by itself",
7058 entity->declaration.type, entity->base.symbol);
7065 static bool semantic_cast(expression_t *cast)
7067 expression_t *expression = cast->unary.value;
7068 type_t *orig_dest_type = cast->base.type;
7069 type_t *orig_type_right = expression->base.type;
7070 type_t const *dst_type = skip_typeref(orig_dest_type);
7071 type_t const *src_type = skip_typeref(orig_type_right);
7072 source_position_t const *pos = &cast->base.source_position;
7074 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7075 if (dst_type == type_void)
7078 /* only integer and pointer can be casted to pointer */
7079 if (is_type_pointer(dst_type) &&
7080 !is_type_pointer(src_type) &&
7081 !is_type_integer(src_type) &&
7082 is_type_valid(src_type)) {
7083 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7087 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7088 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7092 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7093 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7097 if (warning.cast_qual &&
7098 is_type_pointer(src_type) &&
7099 is_type_pointer(dst_type)) {
7100 type_t *src = skip_typeref(src_type->pointer.points_to);
7101 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7102 unsigned missing_qualifiers =
7103 src->base.qualifiers & ~dst->base.qualifiers;
7104 if (missing_qualifiers != 0) {
7106 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7107 missing_qualifiers, orig_type_right);
7113 static expression_t *parse_compound_literal(type_t *type)
7115 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7117 parse_initializer_env_t env;
7120 env.must_be_constant = false;
7121 initializer_t *initializer = parse_initializer(&env);
7124 expression->compound_literal.initializer = initializer;
7125 expression->compound_literal.type = type;
7126 expression->base.type = automatic_type_conversion(type);
7132 * Parse a cast expression.
7134 static expression_t *parse_cast(void)
7136 add_anchor_token(')');
7138 source_position_t source_position = token.source_position;
7140 type_t *type = parse_typename();
7142 rem_anchor_token(')');
7143 expect(')', end_error);
7145 if (token.type == '{') {
7146 return parse_compound_literal(type);
7149 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7150 cast->base.source_position = source_position;
7152 expression_t *value = parse_sub_expression(PREC_CAST);
7153 cast->base.type = type;
7154 cast->unary.value = value;
7156 if (! semantic_cast(cast)) {
7157 /* TODO: record the error in the AST. else it is impossible to detect it */
7162 return create_invalid_expression();
7166 * Parse a statement expression.
7168 static expression_t *parse_statement_expression(void)
7170 add_anchor_token(')');
7172 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7174 statement_t *statement = parse_compound_statement(true);
7175 expression->statement.statement = statement;
7177 /* find last statement and use its type */
7178 type_t *type = type_void;
7179 const statement_t *stmt = statement->compound.statements;
7181 while (stmt->base.next != NULL)
7182 stmt = stmt->base.next;
7184 if (stmt->kind == STATEMENT_EXPRESSION) {
7185 type = stmt->expression.expression->base.type;
7187 } else if (warning.other) {
7188 warningf(&expression->base.source_position, "empty statement expression ({})");
7190 expression->base.type = type;
7192 rem_anchor_token(')');
7193 expect(')', end_error);
7200 * Parse a parenthesized expression.
7202 static expression_t *parse_parenthesized_expression(void)
7206 switch (token.type) {
7208 /* gcc extension: a statement expression */
7209 return parse_statement_expression();
7213 return parse_cast();
7215 if (is_typedef_symbol(token.v.symbol)) {
7216 return parse_cast();
7220 add_anchor_token(')');
7221 expression_t *result = parse_expression();
7222 rem_anchor_token(')');
7223 expect(')', end_error);
7229 static expression_t *parse_function_keyword(void)
7233 if (current_function == NULL) {
7234 errorf(HERE, "'__func__' used outside of a function");
7237 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7238 expression->base.type = type_char_ptr;
7239 expression->funcname.kind = FUNCNAME_FUNCTION;
7246 static expression_t *parse_pretty_function_keyword(void)
7248 if (current_function == NULL) {
7249 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7252 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7253 expression->base.type = type_char_ptr;
7254 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7256 eat(T___PRETTY_FUNCTION__);
7261 static expression_t *parse_funcsig_keyword(void)
7263 if (current_function == NULL) {
7264 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7267 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7268 expression->base.type = type_char_ptr;
7269 expression->funcname.kind = FUNCNAME_FUNCSIG;
7276 static expression_t *parse_funcdname_keyword(void)
7278 if (current_function == NULL) {
7279 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7282 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7283 expression->base.type = type_char_ptr;
7284 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7286 eat(T___FUNCDNAME__);
7291 static designator_t *parse_designator(void)
7293 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7294 result->source_position = *HERE;
7296 if (token.type != T_IDENTIFIER) {
7297 parse_error_expected("while parsing member designator",
7298 T_IDENTIFIER, NULL);
7301 result->symbol = token.v.symbol;
7304 designator_t *last_designator = result;
7306 if (token.type == '.') {
7308 if (token.type != T_IDENTIFIER) {
7309 parse_error_expected("while parsing member designator",
7310 T_IDENTIFIER, NULL);
7313 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7314 designator->source_position = *HERE;
7315 designator->symbol = token.v.symbol;
7318 last_designator->next = designator;
7319 last_designator = designator;
7322 if (token.type == '[') {
7324 add_anchor_token(']');
7325 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7326 designator->source_position = *HERE;
7327 designator->array_index = parse_expression();
7328 rem_anchor_token(']');
7329 expect(']', end_error);
7330 if (designator->array_index == NULL) {
7334 last_designator->next = designator;
7335 last_designator = designator;
7347 * Parse the __builtin_offsetof() expression.
7349 static expression_t *parse_offsetof(void)
7351 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7352 expression->base.type = type_size_t;
7354 eat(T___builtin_offsetof);
7356 expect('(', end_error);
7357 add_anchor_token(',');
7358 type_t *type = parse_typename();
7359 rem_anchor_token(',');
7360 expect(',', end_error);
7361 add_anchor_token(')');
7362 designator_t *designator = parse_designator();
7363 rem_anchor_token(')');
7364 expect(')', end_error);
7366 expression->offsetofe.type = type;
7367 expression->offsetofe.designator = designator;
7370 memset(&path, 0, sizeof(path));
7371 path.top_type = type;
7372 path.path = NEW_ARR_F(type_path_entry_t, 0);
7374 descend_into_subtype(&path);
7376 if (!walk_designator(&path, designator, true)) {
7377 return create_invalid_expression();
7380 DEL_ARR_F(path.path);
7384 return create_invalid_expression();
7388 * Parses a _builtin_va_start() expression.
7390 static expression_t *parse_va_start(void)
7392 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7394 eat(T___builtin_va_start);
7396 expect('(', end_error);
7397 add_anchor_token(',');
7398 expression->va_starte.ap = parse_assignment_expression();
7399 rem_anchor_token(',');
7400 expect(',', end_error);
7401 expression_t *const expr = parse_assignment_expression();
7402 if (expr->kind == EXPR_REFERENCE) {
7403 entity_t *const entity = expr->reference.entity;
7404 if (entity->base.parent_scope != ¤t_function->parameters
7405 || entity->base.next != NULL
7406 || entity->kind != ENTITY_PARAMETER) {
7407 errorf(&expr->base.source_position,
7408 "second argument of 'va_start' must be last parameter of the current function");
7410 expression->va_starte.parameter = &entity->variable;
7412 expect(')', end_error);
7415 expect(')', end_error);
7417 return create_invalid_expression();
7421 * Parses a _builtin_va_arg() expression.
7423 static expression_t *parse_va_arg(void)
7425 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7427 eat(T___builtin_va_arg);
7429 expect('(', end_error);
7430 expression->va_arge.ap = parse_assignment_expression();
7431 expect(',', end_error);
7432 expression->base.type = parse_typename();
7433 expect(')', end_error);
7437 return create_invalid_expression();
7440 static expression_t *parse_builtin_symbol(void)
7442 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7444 symbol_t *symbol = token.v.symbol;
7446 expression->builtin_symbol.symbol = symbol;
7449 type_t *type = get_builtin_symbol_type(symbol);
7450 type = automatic_type_conversion(type);
7452 expression->base.type = type;
7457 * Parses a __builtin_constant() expression.
7459 static expression_t *parse_builtin_constant(void)
7461 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7463 eat(T___builtin_constant_p);
7465 expect('(', end_error);
7466 add_anchor_token(')');
7467 expression->builtin_constant.value = parse_assignment_expression();
7468 rem_anchor_token(')');
7469 expect(')', end_error);
7470 expression->base.type = type_int;
7474 return create_invalid_expression();
7478 * Parses a __builtin_prefetch() expression.
7480 static expression_t *parse_builtin_prefetch(void)
7482 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7484 eat(T___builtin_prefetch);
7486 expect('(', end_error);
7487 add_anchor_token(')');
7488 expression->builtin_prefetch.adr = parse_assignment_expression();
7489 if (token.type == ',') {
7491 expression->builtin_prefetch.rw = parse_assignment_expression();
7493 if (token.type == ',') {
7495 expression->builtin_prefetch.locality = parse_assignment_expression();
7497 rem_anchor_token(')');
7498 expect(')', end_error);
7499 expression->base.type = type_void;
7503 return create_invalid_expression();
7507 * Parses a __builtin_is_*() compare expression.
7509 static expression_t *parse_compare_builtin(void)
7511 expression_t *expression;
7513 switch (token.type) {
7514 case T___builtin_isgreater:
7515 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7517 case T___builtin_isgreaterequal:
7518 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7520 case T___builtin_isless:
7521 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7523 case T___builtin_islessequal:
7524 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7526 case T___builtin_islessgreater:
7527 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7529 case T___builtin_isunordered:
7530 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7533 internal_errorf(HERE, "invalid compare builtin found");
7535 expression->base.source_position = *HERE;
7538 expect('(', end_error);
7539 expression->binary.left = parse_assignment_expression();
7540 expect(',', end_error);
7541 expression->binary.right = parse_assignment_expression();
7542 expect(')', end_error);
7544 type_t *const orig_type_left = expression->binary.left->base.type;
7545 type_t *const orig_type_right = expression->binary.right->base.type;
7547 type_t *const type_left = skip_typeref(orig_type_left);
7548 type_t *const type_right = skip_typeref(orig_type_right);
7549 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7550 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7551 type_error_incompatible("invalid operands in comparison",
7552 &expression->base.source_position, orig_type_left, orig_type_right);
7555 semantic_comparison(&expression->binary);
7560 return create_invalid_expression();
7565 * Parses a __builtin_expect(, end_error) expression.
7567 static expression_t *parse_builtin_expect(void, end_error)
7569 expression_t *expression
7570 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7572 eat(T___builtin_expect);
7574 expect('(', end_error);
7575 expression->binary.left = parse_assignment_expression();
7576 expect(',', end_error);
7577 expression->binary.right = parse_constant_expression();
7578 expect(')', end_error);
7580 expression->base.type = expression->binary.left->base.type;
7584 return create_invalid_expression();
7589 * Parses a MS assume() expression.
7591 static expression_t *parse_assume(void)
7593 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7597 expect('(', end_error);
7598 add_anchor_token(')');
7599 expression->unary.value = parse_assignment_expression();
7600 rem_anchor_token(')');
7601 expect(')', end_error);
7603 expression->base.type = type_void;
7606 return create_invalid_expression();
7610 * Return the declaration for a given label symbol or create a new one.
7612 * @param symbol the symbol of the label
7614 static label_t *get_label(symbol_t *symbol)
7617 assert(current_function != NULL);
7619 label = get_entity(symbol, NAMESPACE_LABEL);
7620 /* if we found a local label, we already created the declaration */
7621 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7622 if (label->base.parent_scope != current_scope) {
7623 assert(label->base.parent_scope->depth < current_scope->depth);
7624 current_function->goto_to_outer = true;
7626 return &label->label;
7629 label = get_entity(symbol, NAMESPACE_LABEL);
7630 /* if we found a label in the same function, then we already created the
7633 && label->base.parent_scope == ¤t_function->parameters) {
7634 return &label->label;
7637 /* otherwise we need to create a new one */
7638 label = allocate_entity_zero(ENTITY_LABEL);
7639 label->base.namespc = NAMESPACE_LABEL;
7640 label->base.symbol = symbol;
7644 return &label->label;
7648 * Parses a GNU && label address expression.
7650 static expression_t *parse_label_address(void)
7652 source_position_t source_position = token.source_position;
7654 if (token.type != T_IDENTIFIER) {
7655 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7658 symbol_t *symbol = token.v.symbol;
7661 label_t *label = get_label(symbol);
7663 label->address_taken = true;
7665 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7666 expression->base.source_position = source_position;
7668 /* label address is threaten as a void pointer */
7669 expression->base.type = type_void_ptr;
7670 expression->label_address.label = label;
7673 return create_invalid_expression();
7677 * Parse a microsoft __noop expression.
7679 static expression_t *parse_noop_expression(void)
7681 /* the result is a (int)0 */
7682 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7683 cnst->base.type = type_int;
7684 cnst->conste.v.int_value = 0;
7685 cnst->conste.is_ms_noop = true;
7689 if (token.type == '(') {
7690 /* parse arguments */
7692 add_anchor_token(')');
7693 add_anchor_token(',');
7695 if (token.type != ')') {
7697 (void)parse_assignment_expression();
7698 if (token.type != ',')
7704 rem_anchor_token(',');
7705 rem_anchor_token(')');
7706 expect(')', end_error);
7713 * Parses a primary expression.
7715 static expression_t *parse_primary_expression(void)
7717 switch (token.type) {
7718 case T_false: return parse_bool_const(false);
7719 case T_true: return parse_bool_const(true);
7720 case T_INTEGER: return parse_int_const();
7721 case T_CHARACTER_CONSTANT: return parse_character_constant();
7722 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7723 case T_FLOATINGPOINT: return parse_float_const();
7724 case T_STRING_LITERAL:
7725 case T_WIDE_STRING_LITERAL: return parse_string_const();
7726 case T_IDENTIFIER: return parse_reference();
7727 case T___FUNCTION__:
7728 case T___func__: return parse_function_keyword();
7729 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7730 case T___FUNCSIG__: return parse_funcsig_keyword();
7731 case T___FUNCDNAME__: return parse_funcdname_keyword();
7732 case T___builtin_offsetof: return parse_offsetof();
7733 case T___builtin_va_start: return parse_va_start();
7734 case T___builtin_va_arg: return parse_va_arg();
7735 case T___builtin_expect:
7736 case T___builtin_alloca:
7737 case T___builtin_inf:
7738 case T___builtin_inff:
7739 case T___builtin_infl:
7740 case T___builtin_nan:
7741 case T___builtin_nanf:
7742 case T___builtin_nanl:
7743 case T___builtin_huge_val:
7744 case T___builtin_va_end: return parse_builtin_symbol();
7745 case T___builtin_isgreater:
7746 case T___builtin_isgreaterequal:
7747 case T___builtin_isless:
7748 case T___builtin_islessequal:
7749 case T___builtin_islessgreater:
7750 case T___builtin_isunordered: return parse_compare_builtin();
7751 case T___builtin_constant_p: return parse_builtin_constant();
7752 case T___builtin_prefetch: return parse_builtin_prefetch();
7753 case T__assume: return parse_assume();
7756 return parse_label_address();
7759 case '(': return parse_parenthesized_expression();
7760 case T___noop: return parse_noop_expression();
7763 errorf(HERE, "unexpected token %K, expected an expression", &token);
7764 return create_invalid_expression();
7768 * Check if the expression has the character type and issue a warning then.
7770 static void check_for_char_index_type(const expression_t *expression)
7772 type_t *const type = expression->base.type;
7773 const type_t *const base_type = skip_typeref(type);
7775 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7776 warning.char_subscripts) {
7777 warningf(&expression->base.source_position,
7778 "array subscript has type '%T'", type);
7782 static expression_t *parse_array_expression(expression_t *left)
7784 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7787 add_anchor_token(']');
7789 expression_t *inside = parse_expression();
7791 type_t *const orig_type_left = left->base.type;
7792 type_t *const orig_type_inside = inside->base.type;
7794 type_t *const type_left = skip_typeref(orig_type_left);
7795 type_t *const type_inside = skip_typeref(orig_type_inside);
7797 type_t *return_type;
7798 array_access_expression_t *array_access = &expression->array_access;
7799 if (is_type_pointer(type_left)) {
7800 return_type = type_left->pointer.points_to;
7801 array_access->array_ref = left;
7802 array_access->index = inside;
7803 check_for_char_index_type(inside);
7804 } else if (is_type_pointer(type_inside)) {
7805 return_type = type_inside->pointer.points_to;
7806 array_access->array_ref = inside;
7807 array_access->index = left;
7808 array_access->flipped = true;
7809 check_for_char_index_type(left);
7811 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7813 "array access on object with non-pointer types '%T', '%T'",
7814 orig_type_left, orig_type_inside);
7816 return_type = type_error_type;
7817 array_access->array_ref = left;
7818 array_access->index = inside;
7821 expression->base.type = automatic_type_conversion(return_type);
7823 rem_anchor_token(']');
7824 expect(']', end_error);
7829 static expression_t *parse_typeprop(expression_kind_t const kind)
7831 expression_t *tp_expression = allocate_expression_zero(kind);
7832 tp_expression->base.type = type_size_t;
7834 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7836 /* we only refer to a type property, mark this case */
7837 bool old = in_type_prop;
7838 in_type_prop = true;
7841 expression_t *expression;
7842 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7844 add_anchor_token(')');
7845 orig_type = parse_typename();
7846 rem_anchor_token(')');
7847 expect(')', end_error);
7849 if (token.type == '{') {
7850 /* It was not sizeof(type) after all. It is sizeof of an expression
7851 * starting with a compound literal */
7852 expression = parse_compound_literal(orig_type);
7853 goto typeprop_expression;
7856 expression = parse_sub_expression(PREC_UNARY);
7858 typeprop_expression:
7859 tp_expression->typeprop.tp_expression = expression;
7861 orig_type = revert_automatic_type_conversion(expression);
7862 expression->base.type = orig_type;
7865 tp_expression->typeprop.type = orig_type;
7866 type_t const* const type = skip_typeref(orig_type);
7867 char const* const wrong_type =
7868 is_type_incomplete(type) ? "incomplete" :
7869 type->kind == TYPE_FUNCTION ? "function designator" :
7870 type->kind == TYPE_BITFIELD ? "bitfield" :
7872 if (wrong_type != NULL) {
7873 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7874 errorf(&tp_expression->base.source_position,
7875 "operand of %s expression must not be of %s type '%T'",
7876 what, wrong_type, orig_type);
7881 return tp_expression;
7884 static expression_t *parse_sizeof(void)
7886 return parse_typeprop(EXPR_SIZEOF);
7889 static expression_t *parse_alignof(void)
7891 return parse_typeprop(EXPR_ALIGNOF);
7894 static expression_t *parse_select_expression(expression_t *compound)
7896 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7897 select->select.compound = compound;
7899 assert(token.type == '.' || token.type == T_MINUSGREATER);
7900 bool is_pointer = (token.type == T_MINUSGREATER);
7903 if (token.type != T_IDENTIFIER) {
7904 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7907 symbol_t *symbol = token.v.symbol;
7910 type_t *const orig_type = compound->base.type;
7911 type_t *const type = skip_typeref(orig_type);
7914 bool saw_error = false;
7915 if (is_type_pointer(type)) {
7918 "request for member '%Y' in something not a struct or union, but '%T'",
7922 type_left = skip_typeref(type->pointer.points_to);
7924 if (is_pointer && is_type_valid(type)) {
7925 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7932 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7933 type_left->kind == TYPE_COMPOUND_UNION) {
7934 compound_t *compound = type_left->compound.compound;
7936 if (!compound->complete) {
7937 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7939 goto create_error_entry;
7942 entry = find_compound_entry(compound, symbol);
7943 if (entry == NULL) {
7944 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7945 goto create_error_entry;
7948 if (is_type_valid(type_left) && !saw_error) {
7950 "request for member '%Y' in something not a struct or union, but '%T'",
7954 entry = create_error_entity(symbol, ENTITY_COMPOUND_MEMBER);
7957 assert(is_declaration(entry));
7958 select->select.compound_entry = entry;
7960 type_t *entry_type = entry->declaration.type;
7962 = get_qualified_type(entry_type, type_left->base.qualifiers);
7964 /* we always do the auto-type conversions; the & and sizeof parser contains
7965 * code to revert this! */
7966 select->base.type = automatic_type_conversion(res_type);
7968 type_t *skipped = skip_typeref(res_type);
7969 if (skipped->kind == TYPE_BITFIELD) {
7970 select->base.type = skipped->bitfield.base_type;
7976 static void check_call_argument(const function_parameter_t *parameter,
7977 call_argument_t *argument, unsigned pos)
7979 type_t *expected_type = parameter->type;
7980 type_t *expected_type_skip = skip_typeref(expected_type);
7981 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7982 expression_t *arg_expr = argument->expression;
7983 type_t *arg_type = skip_typeref(arg_expr->base.type);
7985 /* handle transparent union gnu extension */
7986 if (is_type_union(expected_type_skip)
7987 && (expected_type_skip->base.modifiers
7988 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7989 compound_t *union_decl = expected_type_skip->compound.compound;
7990 type_t *best_type = NULL;
7991 entity_t *entry = union_decl->members.entities;
7992 for ( ; entry != NULL; entry = entry->base.next) {
7993 assert(is_declaration(entry));
7994 type_t *decl_type = entry->declaration.type;
7995 error = semantic_assign(decl_type, arg_expr);
7996 if (error == ASSIGN_ERROR_INCOMPATIBLE
7997 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
8000 if (error == ASSIGN_SUCCESS) {
8001 best_type = decl_type;
8002 } else if (best_type == NULL) {
8003 best_type = decl_type;
8007 if (best_type != NULL) {
8008 expected_type = best_type;
8012 error = semantic_assign(expected_type, arg_expr);
8013 argument->expression = create_implicit_cast(argument->expression,
8016 if (error != ASSIGN_SUCCESS) {
8017 /* report exact scope in error messages (like "in argument 3") */
8019 snprintf(buf, sizeof(buf), "call argument %u", pos);
8020 report_assign_error(error, expected_type, arg_expr, buf,
8021 &arg_expr->base.source_position);
8022 } else if (warning.traditional || warning.conversion) {
8023 type_t *const promoted_type = get_default_promoted_type(arg_type);
8024 if (!types_compatible(expected_type_skip, promoted_type) &&
8025 !types_compatible(expected_type_skip, type_void_ptr) &&
8026 !types_compatible(type_void_ptr, promoted_type)) {
8027 /* Deliberately show the skipped types in this warning */
8028 warningf(&arg_expr->base.source_position,
8029 "passing call argument %u as '%T' rather than '%T' due to prototype",
8030 pos, expected_type_skip, promoted_type);
8036 * Parse a call expression, ie. expression '( ... )'.
8038 * @param expression the function address
8040 static expression_t *parse_call_expression(expression_t *expression)
8042 expression_t *result = allocate_expression_zero(EXPR_CALL);
8043 call_expression_t *call = &result->call;
8044 call->function = expression;
8046 type_t *const orig_type = expression->base.type;
8047 type_t *const type = skip_typeref(orig_type);
8049 function_type_t *function_type = NULL;
8050 if (is_type_pointer(type)) {
8051 type_t *const to_type = skip_typeref(type->pointer.points_to);
8053 if (is_type_function(to_type)) {
8054 function_type = &to_type->function;
8055 call->base.type = function_type->return_type;
8059 if (function_type == NULL && is_type_valid(type)) {
8060 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
8063 /* parse arguments */
8065 add_anchor_token(')');
8066 add_anchor_token(',');
8068 if (token.type != ')') {
8069 call_argument_t *last_argument = NULL;
8072 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8074 argument->expression = parse_assignment_expression();
8075 if (last_argument == NULL) {
8076 call->arguments = argument;
8078 last_argument->next = argument;
8080 last_argument = argument;
8082 if (token.type != ',')
8087 rem_anchor_token(',');
8088 rem_anchor_token(')');
8089 expect(')', end_error);
8091 if (function_type == NULL)
8094 function_parameter_t *parameter = function_type->parameters;
8095 call_argument_t *argument = call->arguments;
8096 if (!function_type->unspecified_parameters) {
8097 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8098 parameter = parameter->next, argument = argument->next) {
8099 check_call_argument(parameter, argument, ++pos);
8102 if (parameter != NULL) {
8103 errorf(HERE, "too few arguments to function '%E'", expression);
8104 } else if (argument != NULL && !function_type->variadic) {
8105 errorf(HERE, "too many arguments to function '%E'", expression);
8109 /* do default promotion */
8110 for (; argument != NULL; argument = argument->next) {
8111 type_t *type = argument->expression->base.type;
8113 type = get_default_promoted_type(type);
8115 argument->expression
8116 = create_implicit_cast(argument->expression, type);
8119 check_format(&result->call);
8121 if (warning.aggregate_return &&
8122 is_type_compound(skip_typeref(function_type->return_type))) {
8123 warningf(&result->base.source_position,
8124 "function call has aggregate value");
8131 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8133 static bool same_compound_type(const type_t *type1, const type_t *type2)
8136 is_type_compound(type1) &&
8137 type1->kind == type2->kind &&
8138 type1->compound.compound == type2->compound.compound;
8141 static expression_t const *get_reference_address(expression_t const *expr)
8143 bool regular_take_address = true;
8145 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8146 expr = expr->unary.value;
8148 regular_take_address = false;
8151 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8154 expr = expr->unary.value;
8157 if (expr->kind != EXPR_REFERENCE)
8160 /* special case for functions which are automatically converted to a
8161 * pointer to function without an extra TAKE_ADDRESS operation */
8162 if (!regular_take_address &&
8163 expr->reference.entity->kind != ENTITY_FUNCTION) {
8170 static void warn_reference_address_as_bool(expression_t const* expr)
8172 if (!warning.address)
8175 expr = get_reference_address(expr);
8177 warningf(&expr->base.source_position,
8178 "the address of '%Y' will always evaluate as 'true'",
8179 expr->reference.entity->base.symbol);
8183 static void semantic_condition(expression_t const *const expr,
8184 char const *const context)
8186 type_t *const type = skip_typeref(expr->base.type);
8187 if (is_type_scalar(type)) {
8188 warn_reference_address_as_bool(expr);
8189 } else if (is_type_valid(type)) {
8190 errorf(&expr->base.source_position,
8191 "%s must have scalar type", context);
8196 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8198 * @param expression the conditional expression
8200 static expression_t *parse_conditional_expression(expression_t *expression)
8202 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8204 conditional_expression_t *conditional = &result->conditional;
8205 conditional->condition = expression;
8208 add_anchor_token(':');
8210 /* §6.5.15:2 The first operand shall have scalar type. */
8211 semantic_condition(expression, "condition of conditional operator");
8213 expression_t *true_expression = expression;
8214 bool gnu_cond = false;
8215 if (GNU_MODE && token.type == ':') {
8218 true_expression = parse_expression();
8220 rem_anchor_token(':');
8221 expect(':', end_error);
8222 expression_t *false_expression =
8223 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8225 type_t *const orig_true_type = true_expression->base.type;
8226 type_t *const orig_false_type = false_expression->base.type;
8227 type_t *const true_type = skip_typeref(orig_true_type);
8228 type_t *const false_type = skip_typeref(orig_false_type);
8231 type_t *result_type;
8232 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8233 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8234 /* ISO/IEC 14882:1998(E) §5.16:2 */
8235 if (true_expression->kind == EXPR_UNARY_THROW) {
8236 result_type = false_type;
8237 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8238 result_type = true_type;
8240 if (warning.other && (
8241 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8242 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8244 warningf(&conditional->base.source_position,
8245 "ISO C forbids conditional expression with only one void side");
8247 result_type = type_void;
8249 } else if (is_type_arithmetic(true_type)
8250 && is_type_arithmetic(false_type)) {
8251 result_type = semantic_arithmetic(true_type, false_type);
8253 true_expression = create_implicit_cast(true_expression, result_type);
8254 false_expression = create_implicit_cast(false_expression, result_type);
8256 conditional->true_expression = true_expression;
8257 conditional->false_expression = false_expression;
8258 conditional->base.type = result_type;
8259 } else if (same_compound_type(true_type, false_type)) {
8260 /* just take 1 of the 2 types */
8261 result_type = true_type;
8262 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8263 type_t *pointer_type;
8265 expression_t *other_expression;
8266 if (is_type_pointer(true_type) &&
8267 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8268 pointer_type = true_type;
8269 other_type = false_type;
8270 other_expression = false_expression;
8272 pointer_type = false_type;
8273 other_type = true_type;
8274 other_expression = true_expression;
8277 if (is_null_pointer_constant(other_expression)) {
8278 result_type = pointer_type;
8279 } else if (is_type_pointer(other_type)) {
8280 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8281 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8284 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8285 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8287 } else if (types_compatible(get_unqualified_type(to1),
8288 get_unqualified_type(to2))) {
8291 if (warning.other) {
8292 warningf(&conditional->base.source_position,
8293 "pointer types '%T' and '%T' in conditional expression are incompatible",
8294 true_type, false_type);
8299 type_t *const type =
8300 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8301 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8302 } else if (is_type_integer(other_type)) {
8303 if (warning.other) {
8304 warningf(&conditional->base.source_position,
8305 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8307 result_type = pointer_type;
8309 if (is_type_valid(other_type)) {
8310 type_error_incompatible("while parsing conditional",
8311 &expression->base.source_position, true_type, false_type);
8313 result_type = type_error_type;
8316 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8317 type_error_incompatible("while parsing conditional",
8318 &conditional->base.source_position, true_type,
8321 result_type = type_error_type;
8324 conditional->true_expression
8325 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8326 conditional->false_expression
8327 = create_implicit_cast(false_expression, result_type);
8328 conditional->base.type = result_type;
8331 return create_invalid_expression();
8335 * Parse an extension expression.
8337 static expression_t *parse_extension(void)
8339 eat(T___extension__);
8341 bool old_gcc_extension = in_gcc_extension;
8342 in_gcc_extension = true;
8343 expression_t *expression = parse_sub_expression(PREC_UNARY);
8344 in_gcc_extension = old_gcc_extension;
8349 * Parse a __builtin_classify_type() expression.
8351 static expression_t *parse_builtin_classify_type(void)
8353 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8354 result->base.type = type_int;
8356 eat(T___builtin_classify_type);
8358 expect('(', end_error);
8359 add_anchor_token(')');
8360 expression_t *expression = parse_expression();
8361 rem_anchor_token(')');
8362 expect(')', end_error);
8363 result->classify_type.type_expression = expression;
8367 return create_invalid_expression();
8371 * Parse a delete expression
8372 * ISO/IEC 14882:1998(E) §5.3.5
8374 static expression_t *parse_delete(void)
8376 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8377 result->base.type = type_void;
8381 if (token.type == '[') {
8383 result->kind = EXPR_UNARY_DELETE_ARRAY;
8384 expect(']', end_error);
8388 expression_t *const value = parse_sub_expression(PREC_CAST);
8389 result->unary.value = value;
8391 type_t *const type = skip_typeref(value->base.type);
8392 if (!is_type_pointer(type)) {
8393 errorf(&value->base.source_position,
8394 "operand of delete must have pointer type");
8395 } else if (warning.other &&
8396 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8397 warningf(&value->base.source_position,
8398 "deleting 'void*' is undefined");
8405 * Parse a throw expression
8406 * ISO/IEC 14882:1998(E) §15:1
8408 static expression_t *parse_throw(void)
8410 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8411 result->base.type = type_void;
8415 expression_t *value = NULL;
8416 switch (token.type) {
8418 value = parse_assignment_expression();
8419 /* ISO/IEC 14882:1998(E) §15.1:3 */
8420 type_t *const orig_type = value->base.type;
8421 type_t *const type = skip_typeref(orig_type);
8422 if (is_type_incomplete(type)) {
8423 errorf(&value->base.source_position,
8424 "cannot throw object of incomplete type '%T'", orig_type);
8425 } else if (is_type_pointer(type)) {
8426 type_t *const points_to = skip_typeref(type->pointer.points_to);
8427 if (is_type_incomplete(points_to) &&
8428 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8429 errorf(&value->base.source_position,
8430 "cannot throw pointer to incomplete type '%T'", orig_type);
8438 result->unary.value = value;
8443 static bool check_pointer_arithmetic(const source_position_t *source_position,
8444 type_t *pointer_type,
8445 type_t *orig_pointer_type)
8447 type_t *points_to = pointer_type->pointer.points_to;
8448 points_to = skip_typeref(points_to);
8450 if (is_type_incomplete(points_to)) {
8451 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8452 errorf(source_position,
8453 "arithmetic with pointer to incomplete type '%T' not allowed",
8456 } else if (warning.pointer_arith) {
8457 warningf(source_position,
8458 "pointer of type '%T' used in arithmetic",
8461 } else if (is_type_function(points_to)) {
8463 errorf(source_position,
8464 "arithmetic with pointer to function type '%T' not allowed",
8467 } else if (warning.pointer_arith) {
8468 warningf(source_position,
8469 "pointer to a function '%T' used in arithmetic",
8476 static bool is_lvalue(const expression_t *expression)
8478 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8479 switch (expression->kind) {
8480 case EXPR_REFERENCE:
8481 case EXPR_ARRAY_ACCESS:
8483 case EXPR_UNARY_DEREFERENCE:
8487 type_t *type = skip_typeref(expression->base.type);
8489 /* ISO/IEC 14882:1998(E) §3.10:3 */
8490 is_type_reference(type) ||
8491 /* Claim it is an lvalue, if the type is invalid. There was a parse
8492 * error before, which maybe prevented properly recognizing it as
8494 !is_type_valid(type);
8499 static void semantic_incdec(unary_expression_t *expression)
8501 type_t *const orig_type = expression->value->base.type;
8502 type_t *const type = skip_typeref(orig_type);
8503 if (is_type_pointer(type)) {
8504 if (!check_pointer_arithmetic(&expression->base.source_position,
8508 } else if (!is_type_real(type) && is_type_valid(type)) {
8509 /* TODO: improve error message */
8510 errorf(&expression->base.source_position,
8511 "operation needs an arithmetic or pointer type");
8514 if (!is_lvalue(expression->value)) {
8515 /* TODO: improve error message */
8516 errorf(&expression->base.source_position, "lvalue required as operand");
8518 expression->base.type = orig_type;
8521 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8523 type_t *const orig_type = expression->value->base.type;
8524 type_t *const type = skip_typeref(orig_type);
8525 if (!is_type_arithmetic(type)) {
8526 if (is_type_valid(type)) {
8527 /* TODO: improve error message */
8528 errorf(&expression->base.source_position,
8529 "operation needs an arithmetic type");
8534 expression->base.type = orig_type;
8537 static void semantic_unexpr_plus(unary_expression_t *expression)
8539 semantic_unexpr_arithmetic(expression);
8540 if (warning.traditional)
8541 warningf(&expression->base.source_position,
8542 "traditional C rejects the unary plus operator");
8545 static void semantic_not(unary_expression_t *expression)
8547 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8548 semantic_condition(expression->value, "operand of !");
8549 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8552 static void semantic_unexpr_integer(unary_expression_t *expression)
8554 type_t *const orig_type = expression->value->base.type;
8555 type_t *const type = skip_typeref(orig_type);
8556 if (!is_type_integer(type)) {
8557 if (is_type_valid(type)) {
8558 errorf(&expression->base.source_position,
8559 "operand of ~ must be of integer type");
8564 expression->base.type = orig_type;
8567 static void semantic_dereference(unary_expression_t *expression)
8569 type_t *const orig_type = expression->value->base.type;
8570 type_t *const type = skip_typeref(orig_type);
8571 if (!is_type_pointer(type)) {
8572 if (is_type_valid(type)) {
8573 errorf(&expression->base.source_position,
8574 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8579 type_t *result_type = type->pointer.points_to;
8580 result_type = automatic_type_conversion(result_type);
8581 expression->base.type = result_type;
8585 * Record that an address is taken (expression represents an lvalue).
8587 * @param expression the expression
8588 * @param may_be_register if true, the expression might be an register
8590 static void set_address_taken(expression_t *expression, bool may_be_register)
8592 if (expression->kind != EXPR_REFERENCE)
8595 entity_t *const entity = expression->reference.entity;
8597 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8600 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8601 && !may_be_register) {
8602 errorf(&expression->base.source_position,
8603 "address of register %s '%Y' requested",
8604 get_entity_kind_name(entity->kind), entity->base.symbol);
8607 if (entity->kind == ENTITY_VARIABLE) {
8608 entity->variable.address_taken = true;
8610 assert(entity->kind == ENTITY_PARAMETER);
8611 entity->parameter.address_taken = true;
8616 * Check the semantic of the address taken expression.
8618 static void semantic_take_addr(unary_expression_t *expression)
8620 expression_t *value = expression->value;
8621 value->base.type = revert_automatic_type_conversion(value);
8623 type_t *orig_type = value->base.type;
8624 type_t *type = skip_typeref(orig_type);
8625 if (!is_type_valid(type))
8629 if (!is_lvalue(value)) {
8630 errorf(&expression->base.source_position, "'&' requires an lvalue");
8632 if (type->kind == TYPE_BITFIELD) {
8633 errorf(&expression->base.source_position,
8634 "'&' not allowed on object with bitfield type '%T'",
8638 set_address_taken(value, false);
8640 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8643 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8644 static expression_t *parse_##unexpression_type(void) \
8646 expression_t *unary_expression \
8647 = allocate_expression_zero(unexpression_type); \
8649 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8651 sfunc(&unary_expression->unary); \
8653 return unary_expression; \
8656 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8657 semantic_unexpr_arithmetic)
8658 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8659 semantic_unexpr_plus)
8660 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8662 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8663 semantic_dereference)
8664 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8666 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8667 semantic_unexpr_integer)
8668 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8670 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8673 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8675 static expression_t *parse_##unexpression_type(expression_t *left) \
8677 expression_t *unary_expression \
8678 = allocate_expression_zero(unexpression_type); \
8680 unary_expression->unary.value = left; \
8682 sfunc(&unary_expression->unary); \
8684 return unary_expression; \
8687 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8688 EXPR_UNARY_POSTFIX_INCREMENT,
8690 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8691 EXPR_UNARY_POSTFIX_DECREMENT,
8694 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8696 /* TODO: handle complex + imaginary types */
8698 type_left = get_unqualified_type(type_left);
8699 type_right = get_unqualified_type(type_right);
8701 /* § 6.3.1.8 Usual arithmetic conversions */
8702 if (type_left == type_long_double || type_right == type_long_double) {
8703 return type_long_double;
8704 } else if (type_left == type_double || type_right == type_double) {
8706 } else if (type_left == type_float || type_right == type_float) {
8710 type_left = promote_integer(type_left);
8711 type_right = promote_integer(type_right);
8713 if (type_left == type_right)
8716 bool const signed_left = is_type_signed(type_left);
8717 bool const signed_right = is_type_signed(type_right);
8718 int const rank_left = get_rank(type_left);
8719 int const rank_right = get_rank(type_right);
8721 if (signed_left == signed_right)
8722 return rank_left >= rank_right ? type_left : type_right;
8731 u_rank = rank_right;
8732 u_type = type_right;
8734 s_rank = rank_right;
8735 s_type = type_right;
8740 if (u_rank >= s_rank)
8743 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8745 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8746 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8750 case ATOMIC_TYPE_INT: return type_unsigned_int;
8751 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8752 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8754 default: panic("invalid atomic type");
8759 * Check the semantic restrictions for a binary expression.
8761 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8763 expression_t *const left = expression->left;
8764 expression_t *const right = expression->right;
8765 type_t *const orig_type_left = left->base.type;
8766 type_t *const orig_type_right = right->base.type;
8767 type_t *const type_left = skip_typeref(orig_type_left);
8768 type_t *const type_right = skip_typeref(orig_type_right);
8770 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8771 /* TODO: improve error message */
8772 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8773 errorf(&expression->base.source_position,
8774 "operation needs arithmetic types");
8779 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8780 expression->left = create_implicit_cast(left, arithmetic_type);
8781 expression->right = create_implicit_cast(right, arithmetic_type);
8782 expression->base.type = arithmetic_type;
8785 static void warn_div_by_zero(binary_expression_t const *const expression)
8787 if (!warning.div_by_zero ||
8788 !is_type_integer(expression->base.type))
8791 expression_t const *const right = expression->right;
8792 /* The type of the right operand can be different for /= */
8793 if (is_type_integer(right->base.type) &&
8794 is_constant_expression(right) &&
8795 fold_constant(right) == 0) {
8796 warningf(&expression->base.source_position, "division by zero");
8801 * Check the semantic restrictions for a div/mod expression.
8803 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8804 semantic_binexpr_arithmetic(expression);
8805 warn_div_by_zero(expression);
8808 static void semantic_shift_op(binary_expression_t *expression)
8810 expression_t *const left = expression->left;
8811 expression_t *const right = expression->right;
8812 type_t *const orig_type_left = left->base.type;
8813 type_t *const orig_type_right = right->base.type;
8814 type_t * type_left = skip_typeref(orig_type_left);
8815 type_t * type_right = skip_typeref(orig_type_right);
8817 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8818 /* TODO: improve error message */
8819 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8820 errorf(&expression->base.source_position,
8821 "operands of shift operation must have integer types");
8826 type_left = promote_integer(type_left);
8827 type_right = promote_integer(type_right);
8829 expression->left = create_implicit_cast(left, type_left);
8830 expression->right = create_implicit_cast(right, type_right);
8831 expression->base.type = type_left;
8834 static void semantic_add(binary_expression_t *expression)
8836 expression_t *const left = expression->left;
8837 expression_t *const right = expression->right;
8838 type_t *const orig_type_left = left->base.type;
8839 type_t *const orig_type_right = right->base.type;
8840 type_t *const type_left = skip_typeref(orig_type_left);
8841 type_t *const type_right = skip_typeref(orig_type_right);
8844 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8845 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8846 expression->left = create_implicit_cast(left, arithmetic_type);
8847 expression->right = create_implicit_cast(right, arithmetic_type);
8848 expression->base.type = arithmetic_type;
8850 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8851 check_pointer_arithmetic(&expression->base.source_position,
8852 type_left, orig_type_left);
8853 expression->base.type = type_left;
8854 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8855 check_pointer_arithmetic(&expression->base.source_position,
8856 type_right, orig_type_right);
8857 expression->base.type = type_right;
8858 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8859 errorf(&expression->base.source_position,
8860 "invalid operands to binary + ('%T', '%T')",
8861 orig_type_left, orig_type_right);
8865 static void semantic_sub(binary_expression_t *expression)
8867 expression_t *const left = expression->left;
8868 expression_t *const right = expression->right;
8869 type_t *const orig_type_left = left->base.type;
8870 type_t *const orig_type_right = right->base.type;
8871 type_t *const type_left = skip_typeref(orig_type_left);
8872 type_t *const type_right = skip_typeref(orig_type_right);
8873 source_position_t const *const pos = &expression->base.source_position;
8876 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8877 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8878 expression->left = create_implicit_cast(left, arithmetic_type);
8879 expression->right = create_implicit_cast(right, arithmetic_type);
8880 expression->base.type = arithmetic_type;
8882 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8883 check_pointer_arithmetic(&expression->base.source_position,
8884 type_left, orig_type_left);
8885 expression->base.type = type_left;
8886 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8887 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8888 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8889 if (!types_compatible(unqual_left, unqual_right)) {
8891 "subtracting pointers to incompatible types '%T' and '%T'",
8892 orig_type_left, orig_type_right);
8893 } else if (!is_type_object(unqual_left)) {
8894 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8895 errorf(pos, "subtracting pointers to non-object types '%T'",
8897 } else if (warning.other) {
8898 warningf(pos, "subtracting pointers to void");
8901 expression->base.type = type_ptrdiff_t;
8902 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8903 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8904 orig_type_left, orig_type_right);
8908 static void warn_string_literal_address(expression_t const* expr)
8910 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8911 expr = expr->unary.value;
8912 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8914 expr = expr->unary.value;
8917 if (expr->kind == EXPR_STRING_LITERAL ||
8918 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8919 warningf(&expr->base.source_position,
8920 "comparison with string literal results in unspecified behaviour");
8925 * Check the semantics of comparison expressions.
8927 * @param expression The expression to check.
8929 static void semantic_comparison(binary_expression_t *expression)
8931 expression_t *left = expression->left;
8932 expression_t *right = expression->right;
8934 if (warning.address) {
8935 warn_string_literal_address(left);
8936 warn_string_literal_address(right);
8938 expression_t const* const func_left = get_reference_address(left);
8939 if (func_left != NULL && is_null_pointer_constant(right)) {
8940 warningf(&expression->base.source_position,
8941 "the address of '%Y' will never be NULL",
8942 func_left->reference.entity->base.symbol);
8945 expression_t const* const func_right = get_reference_address(right);
8946 if (func_right != NULL && is_null_pointer_constant(right)) {
8947 warningf(&expression->base.source_position,
8948 "the address of '%Y' will never be NULL",
8949 func_right->reference.entity->base.symbol);
8953 type_t *orig_type_left = left->base.type;
8954 type_t *orig_type_right = right->base.type;
8955 type_t *type_left = skip_typeref(orig_type_left);
8956 type_t *type_right = skip_typeref(orig_type_right);
8958 /* TODO non-arithmetic types */
8959 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8960 /* test for signed vs unsigned compares */
8961 if (warning.sign_compare &&
8962 (expression->base.kind != EXPR_BINARY_EQUAL &&
8963 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
8964 (is_type_signed(type_left) != is_type_signed(type_right))) {
8966 /* check if 1 of the operands is a constant, in this case we just
8967 * check wether we can safely represent the resulting constant in
8968 * the type of the other operand. */
8969 expression_t *const_expr = NULL;
8970 expression_t *other_expr = NULL;
8972 if (is_constant_expression(left)) {
8975 } else if (is_constant_expression(right)) {
8980 if (const_expr != NULL) {
8981 type_t *other_type = skip_typeref(other_expr->base.type);
8982 long val = fold_constant(const_expr);
8983 /* TODO: check if val can be represented by other_type */
8987 warningf(&expression->base.source_position,
8988 "comparison between signed and unsigned");
8990 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8991 expression->left = create_implicit_cast(left, arithmetic_type);
8992 expression->right = create_implicit_cast(right, arithmetic_type);
8993 expression->base.type = arithmetic_type;
8994 if (warning.float_equal &&
8995 (expression->base.kind == EXPR_BINARY_EQUAL ||
8996 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8997 is_type_float(arithmetic_type)) {
8998 warningf(&expression->base.source_position,
8999 "comparing floating point with == or != is unsafe");
9001 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
9002 /* TODO check compatibility */
9003 } else if (is_type_pointer(type_left)) {
9004 expression->right = create_implicit_cast(right, type_left);
9005 } else if (is_type_pointer(type_right)) {
9006 expression->left = create_implicit_cast(left, type_right);
9007 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9008 type_error_incompatible("invalid operands in comparison",
9009 &expression->base.source_position,
9010 type_left, type_right);
9012 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9016 * Checks if a compound type has constant fields.
9018 static bool has_const_fields(const compound_type_t *type)
9020 compound_t *compound = type->compound;
9021 entity_t *entry = compound->members.entities;
9023 for (; entry != NULL; entry = entry->base.next) {
9024 if (!is_declaration(entry))
9027 const type_t *decl_type = skip_typeref(entry->declaration.type);
9028 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
9035 static bool is_valid_assignment_lhs(expression_t const* const left)
9037 type_t *const orig_type_left = revert_automatic_type_conversion(left);
9038 type_t *const type_left = skip_typeref(orig_type_left);
9040 if (!is_lvalue(left)) {
9041 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
9046 if (left->kind == EXPR_REFERENCE
9047 && left->reference.entity->kind == ENTITY_FUNCTION) {
9048 errorf(HERE, "cannot assign to function '%E'", left);
9052 if (is_type_array(type_left)) {
9053 errorf(HERE, "cannot assign to array '%E'", left);
9056 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
9057 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
9061 if (is_type_incomplete(type_left)) {
9062 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
9063 left, orig_type_left);
9066 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9067 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9068 left, orig_type_left);
9075 static void semantic_arithmetic_assign(binary_expression_t *expression)
9077 expression_t *left = expression->left;
9078 expression_t *right = expression->right;
9079 type_t *orig_type_left = left->base.type;
9080 type_t *orig_type_right = right->base.type;
9082 if (!is_valid_assignment_lhs(left))
9085 type_t *type_left = skip_typeref(orig_type_left);
9086 type_t *type_right = skip_typeref(orig_type_right);
9088 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9089 /* TODO: improve error message */
9090 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9091 errorf(&expression->base.source_position,
9092 "operation needs arithmetic types");
9097 /* combined instructions are tricky. We can't create an implicit cast on
9098 * the left side, because we need the uncasted form for the store.
9099 * The ast2firm pass has to know that left_type must be right_type
9100 * for the arithmetic operation and create a cast by itself */
9101 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9102 expression->right = create_implicit_cast(right, arithmetic_type);
9103 expression->base.type = type_left;
9106 static void semantic_divmod_assign(binary_expression_t *expression)
9108 semantic_arithmetic_assign(expression);
9109 warn_div_by_zero(expression);
9112 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9114 expression_t *const left = expression->left;
9115 expression_t *const right = expression->right;
9116 type_t *const orig_type_left = left->base.type;
9117 type_t *const orig_type_right = right->base.type;
9118 type_t *const type_left = skip_typeref(orig_type_left);
9119 type_t *const type_right = skip_typeref(orig_type_right);
9121 if (!is_valid_assignment_lhs(left))
9124 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9125 /* combined instructions are tricky. We can't create an implicit cast on
9126 * the left side, because we need the uncasted form for the store.
9127 * The ast2firm pass has to know that left_type must be right_type
9128 * for the arithmetic operation and create a cast by itself */
9129 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9130 expression->right = create_implicit_cast(right, arithmetic_type);
9131 expression->base.type = type_left;
9132 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9133 check_pointer_arithmetic(&expression->base.source_position,
9134 type_left, orig_type_left);
9135 expression->base.type = type_left;
9136 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9137 errorf(&expression->base.source_position,
9138 "incompatible types '%T' and '%T' in assignment",
9139 orig_type_left, orig_type_right);
9144 * Check the semantic restrictions of a logical expression.
9146 static void semantic_logical_op(binary_expression_t *expression)
9148 /* §6.5.13:2 Each of the operands shall have scalar type.
9149 * §6.5.14:2 Each of the operands shall have scalar type. */
9150 semantic_condition(expression->left, "left operand of logical operator");
9151 semantic_condition(expression->right, "right operand of logical operator");
9152 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9156 * Check the semantic restrictions of a binary assign expression.
9158 static void semantic_binexpr_assign(binary_expression_t *expression)
9160 expression_t *left = expression->left;
9161 type_t *orig_type_left = left->base.type;
9163 if (!is_valid_assignment_lhs(left))
9166 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9167 report_assign_error(error, orig_type_left, expression->right,
9168 "assignment", &left->base.source_position);
9169 expression->right = create_implicit_cast(expression->right, orig_type_left);
9170 expression->base.type = orig_type_left;
9174 * Determine if the outermost operation (or parts thereof) of the given
9175 * expression has no effect in order to generate a warning about this fact.
9176 * Therefore in some cases this only examines some of the operands of the
9177 * expression (see comments in the function and examples below).
9179 * f() + 23; // warning, because + has no effect
9180 * x || f(); // no warning, because x controls execution of f()
9181 * x ? y : f(); // warning, because y has no effect
9182 * (void)x; // no warning to be able to suppress the warning
9183 * This function can NOT be used for an "expression has definitely no effect"-
9185 static bool expression_has_effect(const expression_t *const expr)
9187 switch (expr->kind) {
9188 case EXPR_UNKNOWN: break;
9189 case EXPR_INVALID: return true; /* do NOT warn */
9190 case EXPR_REFERENCE: return false;
9191 case EXPR_REFERENCE_ENUM_VALUE: return false;
9192 /* suppress the warning for microsoft __noop operations */
9193 case EXPR_CONST: return expr->conste.is_ms_noop;
9194 case EXPR_CHARACTER_CONSTANT: return false;
9195 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9196 case EXPR_STRING_LITERAL: return false;
9197 case EXPR_WIDE_STRING_LITERAL: return false;
9198 case EXPR_LABEL_ADDRESS: return false;
9201 const call_expression_t *const call = &expr->call;
9202 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9205 switch (call->function->builtin_symbol.symbol->ID) {
9206 case T___builtin_va_end: return true;
9207 default: return false;
9211 /* Generate the warning if either the left or right hand side of a
9212 * conditional expression has no effect */
9213 case EXPR_CONDITIONAL: {
9214 const conditional_expression_t *const cond = &expr->conditional;
9216 expression_has_effect(cond->true_expression) &&
9217 expression_has_effect(cond->false_expression);
9220 case EXPR_SELECT: return false;
9221 case EXPR_ARRAY_ACCESS: return false;
9222 case EXPR_SIZEOF: return false;
9223 case EXPR_CLASSIFY_TYPE: return false;
9224 case EXPR_ALIGNOF: return false;
9226 case EXPR_FUNCNAME: return false;
9227 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9228 case EXPR_BUILTIN_CONSTANT_P: return false;
9229 case EXPR_BUILTIN_PREFETCH: return true;
9230 case EXPR_OFFSETOF: return false;
9231 case EXPR_VA_START: return true;
9232 case EXPR_VA_ARG: return true;
9233 case EXPR_STATEMENT: return true; // TODO
9234 case EXPR_COMPOUND_LITERAL: return false;
9236 case EXPR_UNARY_NEGATE: return false;
9237 case EXPR_UNARY_PLUS: return false;
9238 case EXPR_UNARY_BITWISE_NEGATE: return false;
9239 case EXPR_UNARY_NOT: return false;
9240 case EXPR_UNARY_DEREFERENCE: return false;
9241 case EXPR_UNARY_TAKE_ADDRESS: return false;
9242 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9243 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9244 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9245 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9247 /* Treat void casts as if they have an effect in order to being able to
9248 * suppress the warning */
9249 case EXPR_UNARY_CAST: {
9250 type_t *const type = skip_typeref(expr->base.type);
9251 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9254 case EXPR_UNARY_CAST_IMPLICIT: return true;
9255 case EXPR_UNARY_ASSUME: return true;
9256 case EXPR_UNARY_DELETE: return true;
9257 case EXPR_UNARY_DELETE_ARRAY: return true;
9258 case EXPR_UNARY_THROW: return true;
9260 case EXPR_BINARY_ADD: return false;
9261 case EXPR_BINARY_SUB: return false;
9262 case EXPR_BINARY_MUL: return false;
9263 case EXPR_BINARY_DIV: return false;
9264 case EXPR_BINARY_MOD: return false;
9265 case EXPR_BINARY_EQUAL: return false;
9266 case EXPR_BINARY_NOTEQUAL: return false;
9267 case EXPR_BINARY_LESS: return false;
9268 case EXPR_BINARY_LESSEQUAL: return false;
9269 case EXPR_BINARY_GREATER: return false;
9270 case EXPR_BINARY_GREATEREQUAL: return false;
9271 case EXPR_BINARY_BITWISE_AND: return false;
9272 case EXPR_BINARY_BITWISE_OR: return false;
9273 case EXPR_BINARY_BITWISE_XOR: return false;
9274 case EXPR_BINARY_SHIFTLEFT: return false;
9275 case EXPR_BINARY_SHIFTRIGHT: return false;
9276 case EXPR_BINARY_ASSIGN: return true;
9277 case EXPR_BINARY_MUL_ASSIGN: return true;
9278 case EXPR_BINARY_DIV_ASSIGN: return true;
9279 case EXPR_BINARY_MOD_ASSIGN: return true;
9280 case EXPR_BINARY_ADD_ASSIGN: return true;
9281 case EXPR_BINARY_SUB_ASSIGN: return true;
9282 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9283 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9284 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9285 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9286 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9288 /* Only examine the right hand side of && and ||, because the left hand
9289 * side already has the effect of controlling the execution of the right
9291 case EXPR_BINARY_LOGICAL_AND:
9292 case EXPR_BINARY_LOGICAL_OR:
9293 /* Only examine the right hand side of a comma expression, because the left
9294 * hand side has a separate warning */
9295 case EXPR_BINARY_COMMA:
9296 return expression_has_effect(expr->binary.right);
9298 case EXPR_BINARY_ISGREATER: return false;
9299 case EXPR_BINARY_ISGREATEREQUAL: return false;
9300 case EXPR_BINARY_ISLESS: return false;
9301 case EXPR_BINARY_ISLESSEQUAL: return false;
9302 case EXPR_BINARY_ISLESSGREATER: return false;
9303 case EXPR_BINARY_ISUNORDERED: return false;
9306 internal_errorf(HERE, "unexpected expression");
9309 static void semantic_comma(binary_expression_t *expression)
9311 if (warning.unused_value) {
9312 const expression_t *const left = expression->left;
9313 if (!expression_has_effect(left)) {
9314 warningf(&left->base.source_position,
9315 "left-hand operand of comma expression has no effect");
9318 expression->base.type = expression->right->base.type;
9322 * @param prec_r precedence of the right operand
9324 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9325 static expression_t *parse_##binexpression_type(expression_t *left) \
9327 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9328 binexpr->binary.left = left; \
9331 expression_t *right = parse_sub_expression(prec_r); \
9333 binexpr->binary.right = right; \
9334 sfunc(&binexpr->binary); \
9339 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9340 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9341 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9342 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9343 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9344 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9345 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9346 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9347 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9348 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9349 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9350 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9351 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9352 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9353 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9354 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9355 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9356 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9357 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9358 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9359 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9360 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9361 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9362 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9363 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9364 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9365 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9366 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9367 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9368 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9371 static expression_t *parse_sub_expression(precedence_t precedence)
9373 if (token.type < 0) {
9374 return expected_expression_error();
9377 expression_parser_function_t *parser
9378 = &expression_parsers[token.type];
9379 source_position_t source_position = token.source_position;
9382 if (parser->parser != NULL) {
9383 left = parser->parser();
9385 left = parse_primary_expression();
9387 assert(left != NULL);
9388 left->base.source_position = source_position;
9391 if (token.type < 0) {
9392 return expected_expression_error();
9395 parser = &expression_parsers[token.type];
9396 if (parser->infix_parser == NULL)
9398 if (parser->infix_precedence < precedence)
9401 left = parser->infix_parser(left);
9403 assert(left != NULL);
9404 assert(left->kind != EXPR_UNKNOWN);
9405 left->base.source_position = source_position;
9412 * Parse an expression.
9414 static expression_t *parse_expression(void)
9416 return parse_sub_expression(PREC_EXPRESSION);
9420 * Register a parser for a prefix-like operator.
9422 * @param parser the parser function
9423 * @param token_type the token type of the prefix token
9425 static void register_expression_parser(parse_expression_function parser,
9428 expression_parser_function_t *entry = &expression_parsers[token_type];
9430 if (entry->parser != NULL) {
9431 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9432 panic("trying to register multiple expression parsers for a token");
9434 entry->parser = parser;
9438 * Register a parser for an infix operator with given precedence.
9440 * @param parser the parser function
9441 * @param token_type the token type of the infix operator
9442 * @param precedence the precedence of the operator
9444 static void register_infix_parser(parse_expression_infix_function parser,
9445 int token_type, unsigned precedence)
9447 expression_parser_function_t *entry = &expression_parsers[token_type];
9449 if (entry->infix_parser != NULL) {
9450 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9451 panic("trying to register multiple infix expression parsers for a "
9454 entry->infix_parser = parser;
9455 entry->infix_precedence = precedence;
9459 * Initialize the expression parsers.
9461 static void init_expression_parsers(void)
9463 memset(&expression_parsers, 0, sizeof(expression_parsers));
9465 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9466 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9467 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9468 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9469 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9470 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9471 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9472 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9473 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9474 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9475 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9476 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9477 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9478 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9479 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9480 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9481 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9482 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9483 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9484 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9485 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9486 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9487 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9488 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9489 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9490 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9491 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9492 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9493 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9494 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9495 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9496 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9497 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9498 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9499 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9500 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9501 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9503 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9504 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9505 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9506 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9507 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9508 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9509 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9510 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9511 register_expression_parser(parse_sizeof, T_sizeof);
9512 register_expression_parser(parse_alignof, T___alignof__);
9513 register_expression_parser(parse_extension, T___extension__);
9514 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9515 register_expression_parser(parse_delete, T_delete);
9516 register_expression_parser(parse_throw, T_throw);
9520 * Parse a asm statement arguments specification.
9522 static asm_argument_t *parse_asm_arguments(bool is_out)
9524 asm_argument_t *result = NULL;
9525 asm_argument_t **anchor = &result;
9527 while (token.type == T_STRING_LITERAL || token.type == '[') {
9528 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9529 memset(argument, 0, sizeof(argument[0]));
9531 if (token.type == '[') {
9533 if (token.type != T_IDENTIFIER) {
9534 parse_error_expected("while parsing asm argument",
9535 T_IDENTIFIER, NULL);
9538 argument->symbol = token.v.symbol;
9540 expect(']', end_error);
9543 argument->constraints = parse_string_literals();
9544 expect('(', end_error);
9545 add_anchor_token(')');
9546 expression_t *expression = parse_expression();
9547 rem_anchor_token(')');
9549 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9550 * change size or type representation (e.g. int -> long is ok, but
9551 * int -> float is not) */
9552 if (expression->kind == EXPR_UNARY_CAST) {
9553 type_t *const type = expression->base.type;
9554 type_kind_t const kind = type->kind;
9555 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9558 if (kind == TYPE_ATOMIC) {
9559 atomic_type_kind_t const akind = type->atomic.akind;
9560 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9561 size = get_atomic_type_size(akind);
9563 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9564 size = get_atomic_type_size(get_intptr_kind());
9568 expression_t *const value = expression->unary.value;
9569 type_t *const value_type = value->base.type;
9570 type_kind_t const value_kind = value_type->kind;
9572 unsigned value_flags;
9573 unsigned value_size;
9574 if (value_kind == TYPE_ATOMIC) {
9575 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9576 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9577 value_size = get_atomic_type_size(value_akind);
9578 } else if (value_kind == TYPE_POINTER) {
9579 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9580 value_size = get_atomic_type_size(get_intptr_kind());
9585 if (value_flags != flags || value_size != size)
9589 } while (expression->kind == EXPR_UNARY_CAST);
9593 if (!is_lvalue(expression)) {
9594 errorf(&expression->base.source_position,
9595 "asm output argument is not an lvalue");
9598 if (argument->constraints.begin[0] == '+')
9599 mark_vars_read(expression, NULL);
9601 mark_vars_read(expression, NULL);
9603 argument->expression = expression;
9604 expect(')', end_error);
9606 set_address_taken(expression, true);
9609 anchor = &argument->next;
9611 if (token.type != ',')
9622 * Parse a asm statement clobber specification.
9624 static asm_clobber_t *parse_asm_clobbers(void)
9626 asm_clobber_t *result = NULL;
9627 asm_clobber_t *last = NULL;
9629 while (token.type == T_STRING_LITERAL) {
9630 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9631 clobber->clobber = parse_string_literals();
9634 last->next = clobber;
9640 if (token.type != ',')
9649 * Parse an asm statement.
9651 static statement_t *parse_asm_statement(void)
9653 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9654 asm_statement_t *asm_statement = &statement->asms;
9658 if (token.type == T_volatile) {
9660 asm_statement->is_volatile = true;
9663 expect('(', end_error);
9664 add_anchor_token(')');
9665 add_anchor_token(':');
9666 asm_statement->asm_text = parse_string_literals();
9668 if (token.type != ':') {
9669 rem_anchor_token(':');
9674 asm_statement->outputs = parse_asm_arguments(true);
9675 if (token.type != ':') {
9676 rem_anchor_token(':');
9681 asm_statement->inputs = parse_asm_arguments(false);
9682 if (token.type != ':') {
9683 rem_anchor_token(':');
9686 rem_anchor_token(':');
9689 asm_statement->clobbers = parse_asm_clobbers();
9692 rem_anchor_token(')');
9693 expect(')', end_error);
9694 expect(';', end_error);
9696 if (asm_statement->outputs == NULL) {
9697 /* GCC: An 'asm' instruction without any output operands will be treated
9698 * identically to a volatile 'asm' instruction. */
9699 asm_statement->is_volatile = true;
9704 return create_invalid_statement();
9708 * Parse a case statement.
9710 static statement_t *parse_case_statement(void)
9712 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9713 source_position_t *const pos = &statement->base.source_position;
9717 expression_t *const expression = parse_expression();
9718 statement->case_label.expression = expression;
9719 if (!is_constant_expression(expression)) {
9720 /* This check does not prevent the error message in all cases of an
9721 * prior error while parsing the expression. At least it catches the
9722 * common case of a mistyped enum entry. */
9723 if (is_type_valid(skip_typeref(expression->base.type))) {
9724 errorf(pos, "case label does not reduce to an integer constant");
9726 statement->case_label.is_bad = true;
9728 long const val = fold_constant(expression);
9729 statement->case_label.first_case = val;
9730 statement->case_label.last_case = val;
9734 if (token.type == T_DOTDOTDOT) {
9736 expression_t *const end_range = parse_expression();
9737 statement->case_label.end_range = end_range;
9738 if (!is_constant_expression(end_range)) {
9739 /* This check does not prevent the error message in all cases of an
9740 * prior error while parsing the expression. At least it catches the
9741 * common case of a mistyped enum entry. */
9742 if (is_type_valid(skip_typeref(end_range->base.type))) {
9743 errorf(pos, "case range does not reduce to an integer constant");
9745 statement->case_label.is_bad = true;
9747 long const val = fold_constant(end_range);
9748 statement->case_label.last_case = val;
9750 if (warning.other && val < statement->case_label.first_case) {
9751 statement->case_label.is_empty_range = true;
9752 warningf(pos, "empty range specified");
9758 PUSH_PARENT(statement);
9760 expect(':', end_error);
9763 if (current_switch != NULL) {
9764 if (! statement->case_label.is_bad) {
9765 /* Check for duplicate case values */
9766 case_label_statement_t *c = &statement->case_label;
9767 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9768 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9771 if (c->last_case < l->first_case || c->first_case > l->last_case)
9774 errorf(pos, "duplicate case value (previously used %P)",
9775 &l->base.source_position);
9779 /* link all cases into the switch statement */
9780 if (current_switch->last_case == NULL) {
9781 current_switch->first_case = &statement->case_label;
9783 current_switch->last_case->next = &statement->case_label;
9785 current_switch->last_case = &statement->case_label;
9787 errorf(pos, "case label not within a switch statement");
9790 statement_t *const inner_stmt = parse_statement();
9791 statement->case_label.statement = inner_stmt;
9792 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9793 errorf(&inner_stmt->base.source_position, "declaration after case label");
9801 * Parse a default statement.
9803 static statement_t *parse_default_statement(void)
9805 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9809 PUSH_PARENT(statement);
9811 expect(':', end_error);
9812 if (current_switch != NULL) {
9813 const case_label_statement_t *def_label = current_switch->default_label;
9814 if (def_label != NULL) {
9815 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9816 &def_label->base.source_position);
9818 current_switch->default_label = &statement->case_label;
9820 /* link all cases into the switch statement */
9821 if (current_switch->last_case == NULL) {
9822 current_switch->first_case = &statement->case_label;
9824 current_switch->last_case->next = &statement->case_label;
9826 current_switch->last_case = &statement->case_label;
9829 errorf(&statement->base.source_position,
9830 "'default' label not within a switch statement");
9833 statement_t *const inner_stmt = parse_statement();
9834 statement->case_label.statement = inner_stmt;
9835 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9836 errorf(&inner_stmt->base.source_position, "declaration after default label");
9843 return create_invalid_statement();
9847 * Parse a label statement.
9849 static statement_t *parse_label_statement(void)
9851 assert(token.type == T_IDENTIFIER);
9852 symbol_t *symbol = token.v.symbol;
9853 label_t *label = get_label(symbol);
9855 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9856 statement->label.label = label;
9860 PUSH_PARENT(statement);
9862 /* if statement is already set then the label is defined twice,
9863 * otherwise it was just mentioned in a goto/local label declaration so far
9865 if (label->statement != NULL) {
9866 errorf(HERE, "duplicate label '%Y' (declared %P)",
9867 symbol, &label->base.source_position);
9869 label->base.source_position = token.source_position;
9870 label->statement = statement;
9875 if (token.type == '}') {
9876 /* TODO only warn? */
9877 if (warning.other && false) {
9878 warningf(HERE, "label at end of compound statement");
9879 statement->label.statement = create_empty_statement();
9881 errorf(HERE, "label at end of compound statement");
9882 statement->label.statement = create_invalid_statement();
9884 } else if (token.type == ';') {
9885 /* Eat an empty statement here, to avoid the warning about an empty
9886 * statement after a label. label:; is commonly used to have a label
9887 * before a closing brace. */
9888 statement->label.statement = create_empty_statement();
9891 statement_t *const inner_stmt = parse_statement();
9892 statement->label.statement = inner_stmt;
9893 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9894 errorf(&inner_stmt->base.source_position, "declaration after label");
9898 /* remember the labels in a list for later checking */
9899 *label_anchor = &statement->label;
9900 label_anchor = &statement->label.next;
9907 * Parse an if statement.
9909 static statement_t *parse_if(void)
9911 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9915 PUSH_PARENT(statement);
9917 add_anchor_token('{');
9919 expect('(', end_error);
9920 add_anchor_token(')');
9921 expression_t *const expr = parse_expression();
9922 statement->ifs.condition = expr;
9923 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9925 semantic_condition(expr, "condition of 'if'-statment");
9926 mark_vars_read(expr, NULL);
9927 rem_anchor_token(')');
9928 expect(')', end_error);
9931 rem_anchor_token('{');
9933 add_anchor_token(T_else);
9934 statement->ifs.true_statement = parse_statement();
9935 rem_anchor_token(T_else);
9937 if (token.type == T_else) {
9939 statement->ifs.false_statement = parse_statement();
9947 * Check that all enums are handled in a switch.
9949 * @param statement the switch statement to check
9951 static void check_enum_cases(const switch_statement_t *statement) {
9952 const type_t *type = skip_typeref(statement->expression->base.type);
9953 if (! is_type_enum(type))
9955 const enum_type_t *enumt = &type->enumt;
9957 /* if we have a default, no warnings */
9958 if (statement->default_label != NULL)
9961 /* FIXME: calculation of value should be done while parsing */
9962 /* TODO: quadratic algorithm here. Change to an n log n one */
9963 long last_value = -1;
9964 const entity_t *entry = enumt->enume->base.next;
9965 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9966 entry = entry->base.next) {
9967 const expression_t *expression = entry->enum_value.value;
9968 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9970 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9971 if (l->expression == NULL)
9973 if (l->first_case <= value && value <= l->last_case) {
9979 warningf(&statement->base.source_position,
9980 "enumeration value '%Y' not handled in switch",
9981 entry->base.symbol);
9988 * Parse a switch statement.
9990 static statement_t *parse_switch(void)
9992 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9996 PUSH_PARENT(statement);
9998 expect('(', end_error);
9999 add_anchor_token(')');
10000 expression_t *const expr = parse_expression();
10001 mark_vars_read(expr, NULL);
10002 type_t * type = skip_typeref(expr->base.type);
10003 if (is_type_integer(type)) {
10004 type = promote_integer(type);
10005 if (warning.traditional) {
10006 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
10007 warningf(&expr->base.source_position,
10008 "'%T' switch expression not converted to '%T' in ISO C",
10012 } else if (is_type_valid(type)) {
10013 errorf(&expr->base.source_position,
10014 "switch quantity is not an integer, but '%T'", type);
10015 type = type_error_type;
10017 statement->switchs.expression = create_implicit_cast(expr, type);
10018 expect(')', end_error);
10019 rem_anchor_token(')');
10021 switch_statement_t *rem = current_switch;
10022 current_switch = &statement->switchs;
10023 statement->switchs.body = parse_statement();
10024 current_switch = rem;
10026 if (warning.switch_default &&
10027 statement->switchs.default_label == NULL) {
10028 warningf(&statement->base.source_position, "switch has no default case");
10030 if (warning.switch_enum)
10031 check_enum_cases(&statement->switchs);
10037 return create_invalid_statement();
10040 static statement_t *parse_loop_body(statement_t *const loop)
10042 statement_t *const rem = current_loop;
10043 current_loop = loop;
10045 statement_t *const body = parse_statement();
10047 current_loop = rem;
10052 * Parse a while statement.
10054 static statement_t *parse_while(void)
10056 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
10060 PUSH_PARENT(statement);
10062 expect('(', end_error);
10063 add_anchor_token(')');
10064 expression_t *const cond = parse_expression();
10065 statement->whiles.condition = cond;
10066 /* §6.8.5:2 The controlling expression of an iteration statement shall
10067 * have scalar type. */
10068 semantic_condition(cond, "condition of 'while'-statement");
10069 mark_vars_read(cond, NULL);
10070 rem_anchor_token(')');
10071 expect(')', end_error);
10073 statement->whiles.body = parse_loop_body(statement);
10079 return create_invalid_statement();
10083 * Parse a do statement.
10085 static statement_t *parse_do(void)
10087 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10091 PUSH_PARENT(statement);
10093 add_anchor_token(T_while);
10094 statement->do_while.body = parse_loop_body(statement);
10095 rem_anchor_token(T_while);
10097 expect(T_while, end_error);
10098 expect('(', end_error);
10099 add_anchor_token(')');
10100 expression_t *const cond = parse_expression();
10101 statement->do_while.condition = cond;
10102 /* §6.8.5:2 The controlling expression of an iteration statement shall
10103 * have scalar type. */
10104 semantic_condition(cond, "condition of 'do-while'-statement");
10105 mark_vars_read(cond, NULL);
10106 rem_anchor_token(')');
10107 expect(')', end_error);
10108 expect(';', end_error);
10114 return create_invalid_statement();
10118 * Parse a for statement.
10120 static statement_t *parse_for(void)
10122 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10126 expect('(', end_error1);
10127 add_anchor_token(')');
10129 PUSH_PARENT(statement);
10131 size_t const top = environment_top();
10132 scope_t *old_scope = scope_push(&statement->fors.scope);
10134 if (token.type == ';') {
10136 } else if (is_declaration_specifier(&token, false)) {
10137 parse_declaration(record_entity, DECL_FLAGS_NONE);
10139 add_anchor_token(';');
10140 expression_t *const init = parse_expression();
10141 statement->fors.initialisation = init;
10142 mark_vars_read(init, ENT_ANY);
10143 if (warning.unused_value && !expression_has_effect(init)) {
10144 warningf(&init->base.source_position,
10145 "initialisation of 'for'-statement has no effect");
10147 rem_anchor_token(';');
10148 expect(';', end_error2);
10151 if (token.type != ';') {
10152 add_anchor_token(';');
10153 expression_t *const cond = parse_expression();
10154 statement->fors.condition = cond;
10155 /* §6.8.5:2 The controlling expression of an iteration statement
10156 * shall have scalar type. */
10157 semantic_condition(cond, "condition of 'for'-statement");
10158 mark_vars_read(cond, NULL);
10159 rem_anchor_token(';');
10161 expect(';', end_error2);
10162 if (token.type != ')') {
10163 expression_t *const step = parse_expression();
10164 statement->fors.step = step;
10165 mark_vars_read(step, ENT_ANY);
10166 if (warning.unused_value && !expression_has_effect(step)) {
10167 warningf(&step->base.source_position,
10168 "step of 'for'-statement has no effect");
10171 expect(')', end_error2);
10172 rem_anchor_token(')');
10173 statement->fors.body = parse_loop_body(statement);
10175 assert(current_scope == &statement->fors.scope);
10176 scope_pop(old_scope);
10177 environment_pop_to(top);
10184 rem_anchor_token(')');
10185 assert(current_scope == &statement->fors.scope);
10186 scope_pop(old_scope);
10187 environment_pop_to(top);
10191 return create_invalid_statement();
10195 * Parse a goto statement.
10197 static statement_t *parse_goto(void)
10199 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10202 if (GNU_MODE && token.type == '*') {
10204 expression_t *expression = parse_expression();
10205 mark_vars_read(expression, NULL);
10207 /* Argh: although documentation says the expression must be of type void*,
10208 * gcc accepts anything that can be casted into void* without error */
10209 type_t *type = expression->base.type;
10211 if (type != type_error_type) {
10212 if (!is_type_pointer(type) && !is_type_integer(type)) {
10213 errorf(&expression->base.source_position,
10214 "cannot convert to a pointer type");
10215 } else if (warning.other && type != type_void_ptr) {
10216 warningf(&expression->base.source_position,
10217 "type of computed goto expression should be 'void*' not '%T'", type);
10219 expression = create_implicit_cast(expression, type_void_ptr);
10222 statement->gotos.expression = expression;
10224 if (token.type != T_IDENTIFIER) {
10226 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10228 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10229 eat_until_anchor();
10232 symbol_t *symbol = token.v.symbol;
10235 statement->gotos.label = get_label(symbol);
10238 /* remember the goto's in a list for later checking */
10239 *goto_anchor = &statement->gotos;
10240 goto_anchor = &statement->gotos.next;
10242 expect(';', end_error);
10246 return create_invalid_statement();
10250 * Parse a continue statement.
10252 static statement_t *parse_continue(void)
10254 if (current_loop == NULL) {
10255 errorf(HERE, "continue statement not within loop");
10258 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10261 expect(';', end_error);
10268 * Parse a break statement.
10270 static statement_t *parse_break(void)
10272 if (current_switch == NULL && current_loop == NULL) {
10273 errorf(HERE, "break statement not within loop or switch");
10276 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10279 expect(';', end_error);
10286 * Parse a __leave statement.
10288 static statement_t *parse_leave_statement(void)
10290 if (current_try == NULL) {
10291 errorf(HERE, "__leave statement not within __try");
10294 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10297 expect(';', end_error);
10304 * Check if a given entity represents a local variable.
10306 static bool is_local_variable(const entity_t *entity)
10308 if (entity->kind != ENTITY_VARIABLE)
10311 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10312 case STORAGE_CLASS_AUTO:
10313 case STORAGE_CLASS_REGISTER: {
10314 const type_t *type = skip_typeref(entity->declaration.type);
10315 if (is_type_function(type)) {
10327 * Check if a given expression represents a local variable.
10329 static bool expression_is_local_variable(const expression_t *expression)
10331 if (expression->base.kind != EXPR_REFERENCE) {
10334 const entity_t *entity = expression->reference.entity;
10335 return is_local_variable(entity);
10339 * Check if a given expression represents a local variable and
10340 * return its declaration then, else return NULL.
10342 entity_t *expression_is_variable(const expression_t *expression)
10344 if (expression->base.kind != EXPR_REFERENCE) {
10347 entity_t *entity = expression->reference.entity;
10348 if (entity->kind != ENTITY_VARIABLE)
10355 * Parse a return statement.
10357 static statement_t *parse_return(void)
10361 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10363 expression_t *return_value = NULL;
10364 if (token.type != ';') {
10365 return_value = parse_expression();
10366 mark_vars_read(return_value, NULL);
10369 const type_t *const func_type = skip_typeref(current_function->base.type);
10370 assert(is_type_function(func_type));
10371 type_t *const return_type = skip_typeref(func_type->function.return_type);
10373 if (return_value != NULL) {
10374 type_t *return_value_type = skip_typeref(return_value->base.type);
10376 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) &&
10377 !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10378 if (warning.other) {
10379 warningf(&statement->base.source_position,
10380 "'return' with a value, in function returning void");
10382 return_value = NULL;
10384 assign_error_t error = semantic_assign(return_type, return_value);
10385 report_assign_error(error, return_type, return_value, "'return'",
10386 &statement->base.source_position);
10387 return_value = create_implicit_cast(return_value, return_type);
10389 /* check for returning address of a local var */
10390 if (warning.other && return_value != NULL
10391 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10392 const expression_t *expression = return_value->unary.value;
10393 if (expression_is_local_variable(expression)) {
10394 warningf(&statement->base.source_position,
10395 "function returns address of local variable");
10398 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10399 warningf(&statement->base.source_position,
10400 "'return' without value, in function returning non-void");
10402 statement->returns.value = return_value;
10404 expect(';', end_error);
10411 * Parse a declaration statement.
10413 static statement_t *parse_declaration_statement(void)
10415 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10417 entity_t *before = current_scope->last_entity;
10419 parse_external_declaration();
10421 parse_declaration(record_entity, DECL_FLAGS_NONE);
10424 if (before == NULL) {
10425 statement->declaration.declarations_begin = current_scope->entities;
10427 statement->declaration.declarations_begin = before->base.next;
10429 statement->declaration.declarations_end = current_scope->last_entity;
10435 * Parse an expression statement, ie. expr ';'.
10437 static statement_t *parse_expression_statement(void)
10439 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10441 expression_t *const expr = parse_expression();
10442 statement->expression.expression = expr;
10443 mark_vars_read(expr, ENT_ANY);
10445 expect(';', end_error);
10452 * Parse a microsoft __try { } __finally { } or
10453 * __try{ } __except() { }
10455 static statement_t *parse_ms_try_statment(void)
10457 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10460 PUSH_PARENT(statement);
10462 ms_try_statement_t *rem = current_try;
10463 current_try = &statement->ms_try;
10464 statement->ms_try.try_statement = parse_compound_statement(false);
10469 if (token.type == T___except) {
10471 expect('(', end_error);
10472 add_anchor_token(')');
10473 expression_t *const expr = parse_expression();
10474 mark_vars_read(expr, NULL);
10475 type_t * type = skip_typeref(expr->base.type);
10476 if (is_type_integer(type)) {
10477 type = promote_integer(type);
10478 } else if (is_type_valid(type)) {
10479 errorf(&expr->base.source_position,
10480 "__expect expression is not an integer, but '%T'", type);
10481 type = type_error_type;
10483 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10484 rem_anchor_token(')');
10485 expect(')', end_error);
10486 statement->ms_try.final_statement = parse_compound_statement(false);
10487 } else if (token.type == T__finally) {
10489 statement->ms_try.final_statement = parse_compound_statement(false);
10491 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10492 return create_invalid_statement();
10496 return create_invalid_statement();
10499 static statement_t *parse_empty_statement(void)
10501 if (warning.empty_statement) {
10502 warningf(HERE, "statement is empty");
10504 statement_t *const statement = create_empty_statement();
10509 static statement_t *parse_local_label_declaration(void)
10511 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10515 entity_t *begin = NULL, *end = NULL;
10518 if (token.type != T_IDENTIFIER) {
10519 parse_error_expected("while parsing local label declaration",
10520 T_IDENTIFIER, NULL);
10523 symbol_t *symbol = token.v.symbol;
10524 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10525 if (entity != NULL && entity->base.parent_scope == current_scope) {
10526 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10527 symbol, &entity->base.source_position);
10529 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10531 entity->base.parent_scope = current_scope;
10532 entity->base.namespc = NAMESPACE_LABEL;
10533 entity->base.source_position = token.source_position;
10534 entity->base.symbol = symbol;
10537 end->base.next = entity;
10542 environment_push(entity);
10546 if (token.type != ',')
10552 statement->declaration.declarations_begin = begin;
10553 statement->declaration.declarations_end = end;
10557 static void parse_namespace_definition(void)
10561 entity_t *entity = NULL;
10562 symbol_t *symbol = NULL;
10564 if (token.type == T_IDENTIFIER) {
10565 symbol = token.v.symbol;
10568 entity = get_entity(symbol, NAMESPACE_NORMAL);
10569 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10570 && entity->base.parent_scope == current_scope) {
10571 error_redefined_as_different_kind(&token.source_position,
10572 entity, ENTITY_NAMESPACE);
10577 if (entity == NULL) {
10578 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10579 entity->base.symbol = symbol;
10580 entity->base.source_position = token.source_position;
10581 entity->base.namespc = NAMESPACE_NORMAL;
10582 entity->base.parent_scope = current_scope;
10585 if (token.type == '=') {
10586 /* TODO: parse namespace alias */
10587 panic("namespace alias definition not supported yet");
10590 environment_push(entity);
10591 append_entity(current_scope, entity);
10593 size_t const top = environment_top();
10594 scope_t *old_scope = scope_push(&entity->namespacee.members);
10596 expect('{', end_error);
10598 expect('}', end_error);
10601 assert(current_scope == &entity->namespacee.members);
10602 scope_pop(old_scope);
10603 environment_pop_to(top);
10607 * Parse a statement.
10608 * There's also parse_statement() which additionally checks for
10609 * "statement has no effect" warnings
10611 static statement_t *intern_parse_statement(void)
10613 statement_t *statement = NULL;
10615 /* declaration or statement */
10616 add_anchor_token(';');
10617 switch (token.type) {
10618 case T_IDENTIFIER: {
10619 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10620 if (la1_type == ':') {
10621 statement = parse_label_statement();
10622 } else if (is_typedef_symbol(token.v.symbol)) {
10623 statement = parse_declaration_statement();
10625 /* it's an identifier, the grammar says this must be an
10626 * expression statement. However it is common that users mistype
10627 * declaration types, so we guess a bit here to improve robustness
10628 * for incorrect programs */
10629 switch (la1_type) {
10632 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10633 goto expression_statment;
10638 statement = parse_declaration_statement();
10642 expression_statment:
10643 statement = parse_expression_statement();
10650 case T___extension__:
10651 /* This can be a prefix to a declaration or an expression statement.
10652 * We simply eat it now and parse the rest with tail recursion. */
10655 } while (token.type == T___extension__);
10656 bool old_gcc_extension = in_gcc_extension;
10657 in_gcc_extension = true;
10658 statement = intern_parse_statement();
10659 in_gcc_extension = old_gcc_extension;
10663 statement = parse_declaration_statement();
10667 statement = parse_local_label_declaration();
10670 case ';': statement = parse_empty_statement(); break;
10671 case '{': statement = parse_compound_statement(false); break;
10672 case T___leave: statement = parse_leave_statement(); break;
10673 case T___try: statement = parse_ms_try_statment(); break;
10674 case T_asm: statement = parse_asm_statement(); break;
10675 case T_break: statement = parse_break(); break;
10676 case T_case: statement = parse_case_statement(); break;
10677 case T_continue: statement = parse_continue(); break;
10678 case T_default: statement = parse_default_statement(); break;
10679 case T_do: statement = parse_do(); break;
10680 case T_for: statement = parse_for(); break;
10681 case T_goto: statement = parse_goto(); break;
10682 case T_if: statement = parse_if(); break;
10683 case T_return: statement = parse_return(); break;
10684 case T_switch: statement = parse_switch(); break;
10685 case T_while: statement = parse_while(); break;
10688 statement = parse_expression_statement();
10692 errorf(HERE, "unexpected token %K while parsing statement", &token);
10693 statement = create_invalid_statement();
10698 rem_anchor_token(';');
10700 assert(statement != NULL
10701 && statement->base.source_position.input_name != NULL);
10707 * parse a statement and emits "statement has no effect" warning if needed
10708 * (This is really a wrapper around intern_parse_statement with check for 1
10709 * single warning. It is needed, because for statement expressions we have
10710 * to avoid the warning on the last statement)
10712 static statement_t *parse_statement(void)
10714 statement_t *statement = intern_parse_statement();
10716 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10717 expression_t *expression = statement->expression.expression;
10718 if (!expression_has_effect(expression)) {
10719 warningf(&expression->base.source_position,
10720 "statement has no effect");
10728 * Parse a compound statement.
10730 static statement_t *parse_compound_statement(bool inside_expression_statement)
10732 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10734 PUSH_PARENT(statement);
10737 add_anchor_token('}');
10738 /* tokens, which can start a statement */
10739 /* TODO MS, __builtin_FOO */
10740 add_anchor_token('!');
10741 add_anchor_token('&');
10742 add_anchor_token('(');
10743 add_anchor_token('*');
10744 add_anchor_token('+');
10745 add_anchor_token('-');
10746 add_anchor_token('{');
10747 add_anchor_token('~');
10748 add_anchor_token(T_CHARACTER_CONSTANT);
10749 add_anchor_token(T_COLONCOLON);
10750 add_anchor_token(T_FLOATINGPOINT);
10751 add_anchor_token(T_IDENTIFIER);
10752 add_anchor_token(T_INTEGER);
10753 add_anchor_token(T_MINUSMINUS);
10754 add_anchor_token(T_PLUSPLUS);
10755 add_anchor_token(T_STRING_LITERAL);
10756 add_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10757 add_anchor_token(T_WIDE_STRING_LITERAL);
10758 add_anchor_token(T__Bool);
10759 add_anchor_token(T__Complex);
10760 add_anchor_token(T__Imaginary);
10761 add_anchor_token(T___FUNCTION__);
10762 add_anchor_token(T___PRETTY_FUNCTION__);
10763 add_anchor_token(T___alignof__);
10764 add_anchor_token(T___attribute__);
10765 add_anchor_token(T___builtin_va_start);
10766 add_anchor_token(T___extension__);
10767 add_anchor_token(T___func__);
10768 add_anchor_token(T___imag__);
10769 add_anchor_token(T___label__);
10770 add_anchor_token(T___real__);
10771 add_anchor_token(T___thread);
10772 add_anchor_token(T_asm);
10773 add_anchor_token(T_auto);
10774 add_anchor_token(T_bool);
10775 add_anchor_token(T_break);
10776 add_anchor_token(T_case);
10777 add_anchor_token(T_char);
10778 add_anchor_token(T_class);
10779 add_anchor_token(T_const);
10780 add_anchor_token(T_const_cast);
10781 add_anchor_token(T_continue);
10782 add_anchor_token(T_default);
10783 add_anchor_token(T_delete);
10784 add_anchor_token(T_double);
10785 add_anchor_token(T_do);
10786 add_anchor_token(T_dynamic_cast);
10787 add_anchor_token(T_enum);
10788 add_anchor_token(T_extern);
10789 add_anchor_token(T_false);
10790 add_anchor_token(T_float);
10791 add_anchor_token(T_for);
10792 add_anchor_token(T_goto);
10793 add_anchor_token(T_if);
10794 add_anchor_token(T_inline);
10795 add_anchor_token(T_int);
10796 add_anchor_token(T_long);
10797 add_anchor_token(T_new);
10798 add_anchor_token(T_operator);
10799 add_anchor_token(T_register);
10800 add_anchor_token(T_reinterpret_cast);
10801 add_anchor_token(T_restrict);
10802 add_anchor_token(T_return);
10803 add_anchor_token(T_short);
10804 add_anchor_token(T_signed);
10805 add_anchor_token(T_sizeof);
10806 add_anchor_token(T_static);
10807 add_anchor_token(T_static_cast);
10808 add_anchor_token(T_struct);
10809 add_anchor_token(T_switch);
10810 add_anchor_token(T_template);
10811 add_anchor_token(T_this);
10812 add_anchor_token(T_throw);
10813 add_anchor_token(T_true);
10814 add_anchor_token(T_try);
10815 add_anchor_token(T_typedef);
10816 add_anchor_token(T_typeid);
10817 add_anchor_token(T_typename);
10818 add_anchor_token(T_typeof);
10819 add_anchor_token(T_union);
10820 add_anchor_token(T_unsigned);
10821 add_anchor_token(T_using);
10822 add_anchor_token(T_void);
10823 add_anchor_token(T_volatile);
10824 add_anchor_token(T_wchar_t);
10825 add_anchor_token(T_while);
10827 size_t const top = environment_top();
10828 scope_t *old_scope = scope_push(&statement->compound.scope);
10830 statement_t **anchor = &statement->compound.statements;
10831 bool only_decls_so_far = true;
10832 while (token.type != '}') {
10833 if (token.type == T_EOF) {
10834 errorf(&statement->base.source_position,
10835 "EOF while parsing compound statement");
10838 statement_t *sub_statement = intern_parse_statement();
10839 if (is_invalid_statement(sub_statement)) {
10840 /* an error occurred. if we are at an anchor, return */
10846 if (warning.declaration_after_statement) {
10847 if (sub_statement->kind != STATEMENT_DECLARATION) {
10848 only_decls_so_far = false;
10849 } else if (!only_decls_so_far) {
10850 warningf(&sub_statement->base.source_position,
10851 "ISO C90 forbids mixed declarations and code");
10855 *anchor = sub_statement;
10857 while (sub_statement->base.next != NULL)
10858 sub_statement = sub_statement->base.next;
10860 anchor = &sub_statement->base.next;
10864 /* look over all statements again to produce no effect warnings */
10865 if (warning.unused_value) {
10866 statement_t *sub_statement = statement->compound.statements;
10867 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10868 if (sub_statement->kind != STATEMENT_EXPRESSION)
10870 /* don't emit a warning for the last expression in an expression
10871 * statement as it has always an effect */
10872 if (inside_expression_statement && sub_statement->base.next == NULL)
10875 expression_t *expression = sub_statement->expression.expression;
10876 if (!expression_has_effect(expression)) {
10877 warningf(&expression->base.source_position,
10878 "statement has no effect");
10884 rem_anchor_token(T_while);
10885 rem_anchor_token(T_wchar_t);
10886 rem_anchor_token(T_volatile);
10887 rem_anchor_token(T_void);
10888 rem_anchor_token(T_using);
10889 rem_anchor_token(T_unsigned);
10890 rem_anchor_token(T_union);
10891 rem_anchor_token(T_typeof);
10892 rem_anchor_token(T_typename);
10893 rem_anchor_token(T_typeid);
10894 rem_anchor_token(T_typedef);
10895 rem_anchor_token(T_try);
10896 rem_anchor_token(T_true);
10897 rem_anchor_token(T_throw);
10898 rem_anchor_token(T_this);
10899 rem_anchor_token(T_template);
10900 rem_anchor_token(T_switch);
10901 rem_anchor_token(T_struct);
10902 rem_anchor_token(T_static_cast);
10903 rem_anchor_token(T_static);
10904 rem_anchor_token(T_sizeof);
10905 rem_anchor_token(T_signed);
10906 rem_anchor_token(T_short);
10907 rem_anchor_token(T_return);
10908 rem_anchor_token(T_restrict);
10909 rem_anchor_token(T_reinterpret_cast);
10910 rem_anchor_token(T_register);
10911 rem_anchor_token(T_operator);
10912 rem_anchor_token(T_new);
10913 rem_anchor_token(T_long);
10914 rem_anchor_token(T_int);
10915 rem_anchor_token(T_inline);
10916 rem_anchor_token(T_if);
10917 rem_anchor_token(T_goto);
10918 rem_anchor_token(T_for);
10919 rem_anchor_token(T_float);
10920 rem_anchor_token(T_false);
10921 rem_anchor_token(T_extern);
10922 rem_anchor_token(T_enum);
10923 rem_anchor_token(T_dynamic_cast);
10924 rem_anchor_token(T_do);
10925 rem_anchor_token(T_double);
10926 rem_anchor_token(T_delete);
10927 rem_anchor_token(T_default);
10928 rem_anchor_token(T_continue);
10929 rem_anchor_token(T_const_cast);
10930 rem_anchor_token(T_const);
10931 rem_anchor_token(T_class);
10932 rem_anchor_token(T_char);
10933 rem_anchor_token(T_case);
10934 rem_anchor_token(T_break);
10935 rem_anchor_token(T_bool);
10936 rem_anchor_token(T_auto);
10937 rem_anchor_token(T_asm);
10938 rem_anchor_token(T___thread);
10939 rem_anchor_token(T___real__);
10940 rem_anchor_token(T___label__);
10941 rem_anchor_token(T___imag__);
10942 rem_anchor_token(T___func__);
10943 rem_anchor_token(T___extension__);
10944 rem_anchor_token(T___builtin_va_start);
10945 rem_anchor_token(T___attribute__);
10946 rem_anchor_token(T___alignof__);
10947 rem_anchor_token(T___PRETTY_FUNCTION__);
10948 rem_anchor_token(T___FUNCTION__);
10949 rem_anchor_token(T__Imaginary);
10950 rem_anchor_token(T__Complex);
10951 rem_anchor_token(T__Bool);
10952 rem_anchor_token(T_WIDE_STRING_LITERAL);
10953 rem_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10954 rem_anchor_token(T_STRING_LITERAL);
10955 rem_anchor_token(T_PLUSPLUS);
10956 rem_anchor_token(T_MINUSMINUS);
10957 rem_anchor_token(T_INTEGER);
10958 rem_anchor_token(T_IDENTIFIER);
10959 rem_anchor_token(T_FLOATINGPOINT);
10960 rem_anchor_token(T_COLONCOLON);
10961 rem_anchor_token(T_CHARACTER_CONSTANT);
10962 rem_anchor_token('~');
10963 rem_anchor_token('{');
10964 rem_anchor_token('-');
10965 rem_anchor_token('+');
10966 rem_anchor_token('*');
10967 rem_anchor_token('(');
10968 rem_anchor_token('&');
10969 rem_anchor_token('!');
10970 rem_anchor_token('}');
10971 assert(current_scope == &statement->compound.scope);
10972 scope_pop(old_scope);
10973 environment_pop_to(top);
10980 * Check for unused global static functions and variables
10982 static void check_unused_globals(void)
10984 if (!warning.unused_function && !warning.unused_variable)
10987 for (const entity_t *entity = file_scope->entities; entity != NULL;
10988 entity = entity->base.next) {
10989 if (!is_declaration(entity))
10992 const declaration_t *declaration = &entity->declaration;
10993 if (declaration->used ||
10994 declaration->modifiers & DM_UNUSED ||
10995 declaration->modifiers & DM_USED ||
10996 declaration->storage_class != STORAGE_CLASS_STATIC)
10999 type_t *const type = declaration->type;
11001 if (entity->kind == ENTITY_FUNCTION) {
11002 /* inhibit warning for static inline functions */
11003 if (entity->function.is_inline)
11006 s = entity->function.statement != NULL ? "defined" : "declared";
11011 warningf(&declaration->base.source_position, "'%#T' %s but not used",
11012 type, declaration->base.symbol, s);
11016 static void parse_global_asm(void)
11018 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
11021 expect('(', end_error);
11023 statement->asms.asm_text = parse_string_literals();
11024 statement->base.next = unit->global_asm;
11025 unit->global_asm = statement;
11027 expect(')', end_error);
11028 expect(';', end_error);
11033 static void parse_linkage_specification(void)
11036 assert(token.type == T_STRING_LITERAL);
11038 const char *linkage = parse_string_literals().begin;
11040 linkage_kind_t old_linkage = current_linkage;
11041 linkage_kind_t new_linkage;
11042 if (strcmp(linkage, "C") == 0) {
11043 new_linkage = LINKAGE_C;
11044 } else if (strcmp(linkage, "C++") == 0) {
11045 new_linkage = LINKAGE_CXX;
11047 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
11048 new_linkage = LINKAGE_INVALID;
11050 current_linkage = new_linkage;
11052 if (token.type == '{') {
11055 expect('}', end_error);
11061 assert(current_linkage == new_linkage);
11062 current_linkage = old_linkage;
11065 static void parse_external(void)
11067 switch (token.type) {
11068 DECLARATION_START_NO_EXTERN
11070 case T___extension__:
11071 /* tokens below are for implicit int */
11072 case '&': /* & x; -> int& x; (and error later, because C++ has no
11074 case '*': /* * x; -> int* x; */
11075 case '(': /* (x); -> int (x); */
11076 parse_external_declaration();
11080 if (look_ahead(1)->type == T_STRING_LITERAL) {
11081 parse_linkage_specification();
11083 parse_external_declaration();
11088 parse_global_asm();
11092 parse_namespace_definition();
11096 if (!strict_mode) {
11098 warningf(HERE, "stray ';' outside of function");
11105 errorf(HERE, "stray %K outside of function", &token);
11106 if (token.type == '(' || token.type == '{' || token.type == '[')
11107 eat_until_matching_token(token.type);
11113 static void parse_externals(void)
11115 add_anchor_token('}');
11116 add_anchor_token(T_EOF);
11119 unsigned char token_anchor_copy[T_LAST_TOKEN];
11120 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
11123 while (token.type != T_EOF && token.type != '}') {
11125 bool anchor_leak = false;
11126 for (int i = 0; i != T_LAST_TOKEN; ++i) {
11127 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
11129 errorf(HERE, "Leaked anchor token %k %d times", i, count);
11130 anchor_leak = true;
11133 if (in_gcc_extension) {
11134 errorf(HERE, "Leaked __extension__");
11135 anchor_leak = true;
11145 rem_anchor_token(T_EOF);
11146 rem_anchor_token('}');
11150 * Parse a translation unit.
11152 static void parse_translation_unit(void)
11154 add_anchor_token(T_EOF);
11159 if (token.type == T_EOF)
11162 errorf(HERE, "stray %K outside of function", &token);
11163 if (token.type == '(' || token.type == '{' || token.type == '[')
11164 eat_until_matching_token(token.type);
11172 * @return the translation unit or NULL if errors occurred.
11174 void start_parsing(void)
11176 environment_stack = NEW_ARR_F(stack_entry_t, 0);
11177 label_stack = NEW_ARR_F(stack_entry_t, 0);
11178 diagnostic_count = 0;
11182 type_set_output(stderr);
11183 ast_set_output(stderr);
11185 assert(unit == NULL);
11186 unit = allocate_ast_zero(sizeof(unit[0]));
11188 assert(file_scope == NULL);
11189 file_scope = &unit->scope;
11191 assert(current_scope == NULL);
11192 scope_push(&unit->scope);
11195 translation_unit_t *finish_parsing(void)
11197 assert(current_scope == &unit->scope);
11200 assert(file_scope == &unit->scope);
11201 check_unused_globals();
11204 DEL_ARR_F(environment_stack);
11205 DEL_ARR_F(label_stack);
11207 translation_unit_t *result = unit;
11212 /* GCC allows global arrays without size and assigns them a length of one,
11213 * if no different declaration follows */
11214 static void complete_incomplete_arrays(void)
11216 size_t n = ARR_LEN(incomplete_arrays);
11217 for (size_t i = 0; i != n; ++i) {
11218 declaration_t *const decl = incomplete_arrays[i];
11219 type_t *const orig_type = decl->type;
11220 type_t *const type = skip_typeref(orig_type);
11222 if (!is_type_incomplete(type))
11225 if (warning.other) {
11226 warningf(&decl->base.source_position,
11227 "array '%#T' assumed to have one element",
11228 orig_type, decl->base.symbol);
11231 type_t *const new_type = duplicate_type(type);
11232 new_type->array.size_constant = true;
11233 new_type->array.has_implicit_size = true;
11234 new_type->array.size = 1;
11236 type_t *const result = typehash_insert(new_type);
11237 if (type != result)
11240 decl->type = result;
11246 lookahead_bufpos = 0;
11247 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
11250 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
11251 incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
11252 parse_translation_unit();
11253 complete_incomplete_arrays();
11254 DEL_ARR_F(incomplete_arrays);
11255 incomplete_arrays = NULL;
11259 * Initialize the parser.
11261 void init_parser(void)
11263 sym_anonymous = symbol_table_insert("<anonymous>");
11265 if (c_mode & _MS) {
11266 /* add predefined symbols for extended-decl-modifier */
11267 sym_align = symbol_table_insert("align");
11268 sym_allocate = symbol_table_insert("allocate");
11269 sym_dllimport = symbol_table_insert("dllimport");
11270 sym_dllexport = symbol_table_insert("dllexport");
11271 sym_naked = symbol_table_insert("naked");
11272 sym_noinline = symbol_table_insert("noinline");
11273 sym_noreturn = symbol_table_insert("noreturn");
11274 sym_nothrow = symbol_table_insert("nothrow");
11275 sym_novtable = symbol_table_insert("novtable");
11276 sym_property = symbol_table_insert("property");
11277 sym_get = symbol_table_insert("get");
11278 sym_put = symbol_table_insert("put");
11279 sym_selectany = symbol_table_insert("selectany");
11280 sym_thread = symbol_table_insert("thread");
11281 sym_uuid = symbol_table_insert("uuid");
11282 sym_deprecated = symbol_table_insert("deprecated");
11283 sym_restrict = symbol_table_insert("restrict");
11284 sym_noalias = symbol_table_insert("noalias");
11286 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11288 init_expression_parsers();
11289 obstack_init(&temp_obst);
11291 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11292 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11296 * Terminate the parser.
11298 void exit_parser(void)
11300 obstack_free(&temp_obst, NULL);