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_returns_twice = NULL;
160 static const symbol_t *sym_noreturn = NULL;
161 static const symbol_t *sym_nothrow = NULL;
162 static const symbol_t *sym_novtable = NULL;
163 static const symbol_t *sym_property = NULL;
164 static const symbol_t *sym_get = NULL;
165 static const symbol_t *sym_put = NULL;
166 static const symbol_t *sym_selectany = NULL;
167 static const symbol_t *sym_thread = NULL;
168 static const symbol_t *sym_uuid = NULL;
169 static const symbol_t *sym_deprecated = NULL;
170 static const symbol_t *sym_restrict = NULL;
171 static const symbol_t *sym_noalias = NULL;
173 /** The token anchor set */
174 static unsigned char token_anchor_set[T_LAST_TOKEN];
176 /** The current source position. */
177 #define HERE (&token.source_position)
179 /** true if we are in GCC mode. */
180 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
182 static type_t *type_valist;
184 static statement_t *parse_compound_statement(bool inside_expression_statement);
185 static statement_t *parse_statement(void);
187 static expression_t *parse_sub_expression(precedence_t);
188 static expression_t *parse_expression(void);
189 static type_t *parse_typename(void);
190 static void parse_externals(void);
191 static void parse_external(void);
193 static void parse_compound_type_entries(compound_t *compound_declaration);
195 typedef enum declarator_flags_t {
197 DECL_MAY_BE_ABSTRACT = 1U << 0,
198 DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
199 DECL_IS_PARAMETER = 1U << 2
200 } declarator_flags_t;
202 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
203 declarator_flags_t flags);
205 static entity_t *record_entity(entity_t *entity, bool is_definition);
207 static void semantic_comparison(binary_expression_t *expression);
209 #define STORAGE_CLASSES \
210 STORAGE_CLASSES_NO_EXTERN \
213 #define STORAGE_CLASSES_NO_EXTERN \
220 #define TYPE_QUALIFIERS \
225 case T__forceinline: \
226 case T___attribute__:
228 #define COMPLEX_SPECIFIERS \
230 #define IMAGINARY_SPECIFIERS \
233 #define TYPE_SPECIFIERS \
235 case T___builtin_va_list: \
255 #define DECLARATION_START \
260 #define DECLARATION_START_NO_EXTERN \
261 STORAGE_CLASSES_NO_EXTERN \
265 #define TYPENAME_START \
269 #define EXPRESSION_START \
278 case T_CHARACTER_CONSTANT: \
279 case T_FLOATINGPOINT: \
283 case T_STRING_LITERAL: \
284 case T_WIDE_CHARACTER_CONSTANT: \
285 case T_WIDE_STRING_LITERAL: \
286 case T___FUNCDNAME__: \
287 case T___FUNCSIG__: \
288 case T___FUNCTION__: \
289 case T___PRETTY_FUNCTION__: \
290 case T___alignof__: \
291 case T___builtin_alloca: \
292 case T___builtin_classify_type: \
293 case T___builtin_constant_p: \
294 case T___builtin_expect: \
295 case T___builtin_huge_val: \
296 case T___builtin_inf: \
297 case T___builtin_inff: \
298 case T___builtin_infl: \
299 case T___builtin_isgreater: \
300 case T___builtin_isgreaterequal: \
301 case T___builtin_isless: \
302 case T___builtin_islessequal: \
303 case T___builtin_islessgreater: \
304 case T___builtin_isunordered: \
305 case T___builtin_nan: \
306 case T___builtin_nanf: \
307 case T___builtin_nanl: \
308 case T___builtin_offsetof: \
309 case T___builtin_prefetch: \
310 case T___builtin_va_arg: \
311 case T___builtin_va_end: \
312 case T___builtin_va_start: \
323 * Allocate an AST node with given size and
324 * initialize all fields with zero.
326 static void *allocate_ast_zero(size_t size)
328 void *res = allocate_ast(size);
329 memset(res, 0, size);
334 * Returns the size of an entity node.
336 * @param kind the entity kind
338 static size_t get_entity_struct_size(entity_kind_t kind)
340 static const size_t sizes[] = {
341 [ENTITY_VARIABLE] = sizeof(variable_t),
342 [ENTITY_PARAMETER] = sizeof(parameter_t),
343 [ENTITY_COMPOUND_MEMBER] = sizeof(compound_member_t),
344 [ENTITY_FUNCTION] = sizeof(function_t),
345 [ENTITY_TYPEDEF] = sizeof(typedef_t),
346 [ENTITY_STRUCT] = sizeof(compound_t),
347 [ENTITY_UNION] = sizeof(compound_t),
348 [ENTITY_ENUM] = sizeof(enum_t),
349 [ENTITY_ENUM_VALUE] = sizeof(enum_value_t),
350 [ENTITY_LABEL] = sizeof(label_t),
351 [ENTITY_LOCAL_LABEL] = sizeof(label_t),
352 [ENTITY_NAMESPACE] = sizeof(namespace_t)
354 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
355 assert(sizes[kind] != 0);
360 * Allocate an entity of given kind and initialize all
363 static entity_t *allocate_entity_zero(entity_kind_t kind)
365 size_t size = get_entity_struct_size(kind);
366 entity_t *entity = allocate_ast_zero(size);
372 * Returns the size of a statement node.
374 * @param kind the statement kind
376 static size_t get_statement_struct_size(statement_kind_t kind)
378 static const size_t sizes[] = {
379 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
380 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
381 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
382 [STATEMENT_RETURN] = sizeof(return_statement_t),
383 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
384 [STATEMENT_LOCAL_LABEL] = sizeof(local_label_statement_t),
385 [STATEMENT_IF] = sizeof(if_statement_t),
386 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
387 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
388 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
389 [STATEMENT_BREAK] = sizeof(statement_base_t),
390 [STATEMENT_GOTO] = sizeof(goto_statement_t),
391 [STATEMENT_LABEL] = sizeof(label_statement_t),
392 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
393 [STATEMENT_WHILE] = sizeof(while_statement_t),
394 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
395 [STATEMENT_FOR] = sizeof(for_statement_t),
396 [STATEMENT_ASM] = sizeof(asm_statement_t),
397 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
398 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
400 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
401 assert(sizes[kind] != 0);
406 * Returns the size of an expression node.
408 * @param kind the expression kind
410 static size_t get_expression_struct_size(expression_kind_t kind)
412 static const size_t sizes[] = {
413 [EXPR_INVALID] = sizeof(expression_base_t),
414 [EXPR_REFERENCE] = sizeof(reference_expression_t),
415 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
416 [EXPR_CONST] = sizeof(const_expression_t),
417 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
418 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
419 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
420 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
421 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
422 [EXPR_CALL] = sizeof(call_expression_t),
423 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
424 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
425 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
426 [EXPR_SELECT] = sizeof(select_expression_t),
427 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
428 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
429 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
430 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
431 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
432 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
433 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
434 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
435 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
436 [EXPR_VA_START] = sizeof(va_start_expression_t),
437 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
438 [EXPR_STATEMENT] = sizeof(statement_expression_t),
439 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
441 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
442 return sizes[EXPR_UNARY_FIRST];
444 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
445 return sizes[EXPR_BINARY_FIRST];
447 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
448 assert(sizes[kind] != 0);
453 * Allocate a statement node of given kind and initialize all
454 * fields with zero. Sets its source position to the position
455 * of the current token.
457 static statement_t *allocate_statement_zero(statement_kind_t kind)
459 size_t size = get_statement_struct_size(kind);
460 statement_t *res = allocate_ast_zero(size);
462 res->base.kind = kind;
463 res->base.parent = current_parent;
464 res->base.source_position = token.source_position;
469 * Allocate an expression node of given kind and initialize all
472 static expression_t *allocate_expression_zero(expression_kind_t kind)
474 size_t size = get_expression_struct_size(kind);
475 expression_t *res = allocate_ast_zero(size);
477 res->base.kind = kind;
478 res->base.type = type_error_type;
479 res->base.source_position = token.source_position;
484 * Creates a new invalid expression at the source position
485 * of the current token.
487 static expression_t *create_invalid_expression(void)
489 return allocate_expression_zero(EXPR_INVALID);
493 * Creates a new invalid statement.
495 static statement_t *create_invalid_statement(void)
497 return allocate_statement_zero(STATEMENT_INVALID);
501 * Allocate a new empty statement.
503 static statement_t *create_empty_statement(void)
505 return allocate_statement_zero(STATEMENT_EMPTY);
509 * Returns the size of a type node.
511 * @param kind the type kind
513 static size_t get_type_struct_size(type_kind_t kind)
515 static const size_t sizes[] = {
516 [TYPE_ATOMIC] = sizeof(atomic_type_t),
517 [TYPE_COMPLEX] = sizeof(complex_type_t),
518 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
519 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
520 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
521 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
522 [TYPE_ENUM] = sizeof(enum_type_t),
523 [TYPE_FUNCTION] = sizeof(function_type_t),
524 [TYPE_POINTER] = sizeof(pointer_type_t),
525 [TYPE_ARRAY] = sizeof(array_type_t),
526 [TYPE_BUILTIN] = sizeof(builtin_type_t),
527 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
528 [TYPE_TYPEOF] = sizeof(typeof_type_t),
530 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
531 assert(kind <= TYPE_TYPEOF);
532 assert(sizes[kind] != 0);
537 * Allocate a type node of given kind and initialize all
540 * @param kind type kind to allocate
542 static type_t *allocate_type_zero(type_kind_t kind)
544 size_t size = get_type_struct_size(kind);
545 type_t *res = obstack_alloc(type_obst, size);
546 memset(res, 0, size);
547 res->base.kind = kind;
553 * Returns the size of an initializer node.
555 * @param kind the initializer kind
557 static size_t get_initializer_size(initializer_kind_t kind)
559 static const size_t sizes[] = {
560 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
561 [INITIALIZER_STRING] = sizeof(initializer_string_t),
562 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
563 [INITIALIZER_LIST] = sizeof(initializer_list_t),
564 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
566 assert(kind < sizeof(sizes) / sizeof(*sizes));
567 assert(sizes[kind] != 0);
572 * Allocate an initializer node of given kind and initialize all
575 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
577 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
584 * Free a type from the type obstack.
586 static void free_type(void *type)
588 obstack_free(type_obst, type);
592 * Returns the index of the top element of the environment stack.
594 static size_t environment_top(void)
596 return ARR_LEN(environment_stack);
600 * Returns the index of the top element of the global label stack.
602 static size_t label_top(void)
604 return ARR_LEN(label_stack);
608 * Return the next token.
610 static inline void next_token(void)
612 token = lookahead_buffer[lookahead_bufpos];
613 lookahead_buffer[lookahead_bufpos] = lexer_token;
616 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
619 print_token(stderr, &token);
620 fprintf(stderr, "\n");
625 * Return the next token with a given lookahead.
627 static inline const token_t *look_ahead(int num)
629 assert(num > 0 && num <= MAX_LOOKAHEAD);
630 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
631 return &lookahead_buffer[pos];
635 * Adds a token type to the token type anchor set (a multi-set).
637 static void add_anchor_token(int token_type)
639 assert(0 <= token_type && token_type < T_LAST_TOKEN);
640 ++token_anchor_set[token_type];
644 * Set the number of tokens types of the given type
645 * to zero and return the old count.
647 static int save_and_reset_anchor_state(int token_type)
649 assert(0 <= token_type && token_type < T_LAST_TOKEN);
650 int count = token_anchor_set[token_type];
651 token_anchor_set[token_type] = 0;
656 * Restore the number of token types to the given count.
658 static void restore_anchor_state(int token_type, int count)
660 assert(0 <= token_type && token_type < T_LAST_TOKEN);
661 token_anchor_set[token_type] = count;
665 * Remove a token type from the token type anchor set (a multi-set).
667 static void rem_anchor_token(int token_type)
669 assert(0 <= token_type && token_type < T_LAST_TOKEN);
670 assert(token_anchor_set[token_type] != 0);
671 --token_anchor_set[token_type];
675 * Return true if the token type of the current token is
678 static bool at_anchor(void)
682 return token_anchor_set[token.type];
686 * Eat tokens until a matching token type is found.
688 static void eat_until_matching_token(int type)
692 case '(': end_token = ')'; break;
693 case '{': end_token = '}'; break;
694 case '[': end_token = ']'; break;
695 default: end_token = type; break;
698 unsigned parenthesis_count = 0;
699 unsigned brace_count = 0;
700 unsigned bracket_count = 0;
701 while (token.type != end_token ||
702 parenthesis_count != 0 ||
704 bracket_count != 0) {
705 switch (token.type) {
707 case '(': ++parenthesis_count; break;
708 case '{': ++brace_count; break;
709 case '[': ++bracket_count; break;
712 if (parenthesis_count > 0)
722 if (bracket_count > 0)
725 if (token.type == end_token &&
726 parenthesis_count == 0 &&
740 * Eat input tokens until an anchor is found.
742 static void eat_until_anchor(void)
744 while (token_anchor_set[token.type] == 0) {
745 if (token.type == '(' || token.type == '{' || token.type == '[')
746 eat_until_matching_token(token.type);
752 * Eat a whole block from input tokens.
754 static void eat_block(void)
756 eat_until_matching_token('{');
757 if (token.type == '}')
761 #define eat(token_type) do { assert(token.type == (token_type)); next_token(); } while (0)
764 * Report a parse error because an expected token was not found.
767 #if defined __GNUC__ && __GNUC__ >= 4
768 __attribute__((sentinel))
770 void parse_error_expected(const char *message, ...)
772 if (message != NULL) {
773 errorf(HERE, "%s", message);
776 va_start(ap, message);
777 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
782 * Report an incompatible type.
784 static void type_error_incompatible(const char *msg,
785 const source_position_t *source_position, type_t *type1, type_t *type2)
787 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
792 * Expect the current token is the expected token.
793 * If not, generate an error, eat the current statement,
794 * and goto the end_error label.
796 #define expect(expected, error_label) \
798 if (UNLIKELY(token.type != (expected))) { \
799 parse_error_expected(NULL, (expected), NULL); \
800 add_anchor_token(expected); \
801 eat_until_anchor(); \
802 if (token.type == expected) \
804 rem_anchor_token(expected); \
811 * Push a given scope on the scope stack and make it the
814 static scope_t *scope_push(scope_t *new_scope)
816 if (current_scope != NULL) {
817 new_scope->depth = current_scope->depth + 1;
820 scope_t *old_scope = current_scope;
821 current_scope = new_scope;
826 * Pop the current scope from the scope stack.
828 static void scope_pop(scope_t *old_scope)
830 current_scope = old_scope;
834 * Search an entity by its symbol in a given namespace.
836 static entity_t *get_entity(const symbol_t *const symbol,
837 namespace_tag_t namespc)
839 entity_t *entity = symbol->entity;
840 for (; entity != NULL; entity = entity->base.symbol_next) {
841 if (entity->base.namespc == namespc)
849 * pushs an entity on the environment stack and links the corresponding symbol
852 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
854 symbol_t *symbol = entity->base.symbol;
855 entity_namespace_t namespc = entity->base.namespc;
856 assert(namespc != NAMESPACE_INVALID);
858 /* replace/add entity into entity list of the symbol */
861 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
866 /* replace an entry? */
867 if (iter->base.namespc == namespc) {
868 entity->base.symbol_next = iter->base.symbol_next;
874 /* remember old declaration */
876 entry.symbol = symbol;
877 entry.old_entity = iter;
878 entry.namespc = namespc;
879 ARR_APP1(stack_entry_t, *stack_ptr, entry);
883 * Push an entity on the environment stack.
885 static void environment_push(entity_t *entity)
887 assert(entity->base.source_position.input_name != NULL);
888 assert(entity->base.parent_scope != NULL);
889 stack_push(&environment_stack, entity);
893 * Push a declaration on the global label stack.
895 * @param declaration the declaration
897 static void label_push(entity_t *label)
899 /* we abuse the parameters scope as parent for the labels */
900 label->base.parent_scope = ¤t_function->parameters;
901 stack_push(&label_stack, label);
905 * pops symbols from the environment stack until @p new_top is the top element
907 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
909 stack_entry_t *stack = *stack_ptr;
910 size_t top = ARR_LEN(stack);
913 assert(new_top <= top);
917 for (i = top; i > new_top; --i) {
918 stack_entry_t *entry = &stack[i - 1];
920 entity_t *old_entity = entry->old_entity;
921 symbol_t *symbol = entry->symbol;
922 entity_namespace_t namespc = entry->namespc;
924 /* replace with old_entity/remove */
927 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
929 assert(iter != NULL);
930 /* replace an entry? */
931 if (iter->base.namespc == namespc)
935 /* restore definition from outer scopes (if there was one) */
936 if (old_entity != NULL) {
937 old_entity->base.symbol_next = iter->base.symbol_next;
938 *anchor = old_entity;
940 /* remove entry from list */
941 *anchor = iter->base.symbol_next;
945 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
949 * Pop all entries from the environment stack until the new_top
952 * @param new_top the new stack top
954 static void environment_pop_to(size_t new_top)
956 stack_pop_to(&environment_stack, new_top);
960 * Pop all entries from the global label stack until the new_top
963 * @param new_top the new stack top
965 static void label_pop_to(size_t new_top)
967 stack_pop_to(&label_stack, new_top);
970 static int get_akind_rank(atomic_type_kind_t akind)
976 * Return the type rank for an atomic type.
978 static int get_rank(const type_t *type)
980 assert(!is_typeref(type));
981 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
982 * and esp. footnote 108). However we can't fold constants (yet), so we
983 * can't decide whether unsigned int is possible, while int always works.
984 * (unsigned int would be preferable when possible... for stuff like
985 * struct { enum { ... } bla : 4; } ) */
986 if (type->kind == TYPE_ENUM)
987 return get_akind_rank(ATOMIC_TYPE_INT);
989 assert(type->kind == TYPE_ATOMIC);
990 return get_akind_rank(type->atomic.akind);
994 * Do integer promotion for a given type.
996 * @param type the type to promote
997 * @return the promoted type
999 static type_t *promote_integer(type_t *type)
1001 if (type->kind == TYPE_BITFIELD)
1002 type = type->bitfield.base_type;
1004 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
1011 * Create a cast expression.
1013 * @param expression the expression to cast
1014 * @param dest_type the destination type
1016 static expression_t *create_cast_expression(expression_t *expression,
1019 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
1021 cast->unary.value = expression;
1022 cast->base.type = dest_type;
1028 * Check if a given expression represents a null pointer constant.
1030 * @param expression the expression to check
1032 static bool is_null_pointer_constant(const expression_t *expression)
1034 /* skip void* cast */
1035 if (expression->kind == EXPR_UNARY_CAST
1036 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
1037 expression = expression->unary.value;
1040 /* TODO: not correct yet, should be any constant integer expression
1041 * which evaluates to 0 */
1042 if (expression->kind != EXPR_CONST)
1045 type_t *const type = skip_typeref(expression->base.type);
1046 if (!is_type_integer(type))
1049 return expression->conste.v.int_value == 0;
1053 * Create an implicit cast expression.
1055 * @param expression the expression to cast
1056 * @param dest_type the destination type
1058 static expression_t *create_implicit_cast(expression_t *expression,
1061 type_t *const source_type = expression->base.type;
1063 if (source_type == dest_type)
1066 return create_cast_expression(expression, dest_type);
1069 typedef enum assign_error_t {
1071 ASSIGN_ERROR_INCOMPATIBLE,
1072 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1073 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1074 ASSIGN_WARNING_POINTER_FROM_INT,
1075 ASSIGN_WARNING_INT_FROM_POINTER
1078 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1079 const expression_t *const right,
1080 const char *context,
1081 const source_position_t *source_position)
1083 type_t *const orig_type_right = right->base.type;
1084 type_t *const type_left = skip_typeref(orig_type_left);
1085 type_t *const type_right = skip_typeref(orig_type_right);
1088 case ASSIGN_SUCCESS:
1090 case ASSIGN_ERROR_INCOMPATIBLE:
1091 errorf(source_position,
1092 "destination type '%T' in %s is incompatible with type '%T'",
1093 orig_type_left, context, orig_type_right);
1096 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1097 if (warning.other) {
1098 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
1099 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1101 /* the left type has all qualifiers from the right type */
1102 unsigned missing_qualifiers
1103 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1104 warningf(source_position,
1105 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1106 orig_type_left, context, orig_type_right, missing_qualifiers);
1111 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1112 if (warning.other) {
1113 warningf(source_position,
1114 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1115 orig_type_left, context, right, orig_type_right);
1119 case ASSIGN_WARNING_POINTER_FROM_INT:
1120 if (warning.other) {
1121 warningf(source_position,
1122 "%s makes pointer '%T' from integer '%T' without a cast",
1123 context, orig_type_left, orig_type_right);
1127 case ASSIGN_WARNING_INT_FROM_POINTER:
1128 if (warning.other) {
1129 warningf(source_position,
1130 "%s makes integer '%T' from pointer '%T' without a cast",
1131 context, orig_type_left, orig_type_right);
1136 panic("invalid error value");
1140 /** Implements the rules from § 6.5.16.1 */
1141 static assign_error_t semantic_assign(type_t *orig_type_left,
1142 const expression_t *const right)
1144 type_t *const orig_type_right = right->base.type;
1145 type_t *const type_left = skip_typeref(orig_type_left);
1146 type_t *const type_right = skip_typeref(orig_type_right);
1148 if (is_type_pointer(type_left)) {
1149 if (is_null_pointer_constant(right)) {
1150 return ASSIGN_SUCCESS;
1151 } else if (is_type_pointer(type_right)) {
1152 type_t *points_to_left
1153 = skip_typeref(type_left->pointer.points_to);
1154 type_t *points_to_right
1155 = skip_typeref(type_right->pointer.points_to);
1156 assign_error_t res = ASSIGN_SUCCESS;
1158 /* the left type has all qualifiers from the right type */
1159 unsigned missing_qualifiers
1160 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1161 if (missing_qualifiers != 0) {
1162 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1165 points_to_left = get_unqualified_type(points_to_left);
1166 points_to_right = get_unqualified_type(points_to_right);
1168 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1171 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1172 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1173 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1176 if (!types_compatible(points_to_left, points_to_right)) {
1177 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1181 } else if (is_type_integer(type_right)) {
1182 return ASSIGN_WARNING_POINTER_FROM_INT;
1184 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1185 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1186 && is_type_pointer(type_right))) {
1187 return ASSIGN_SUCCESS;
1188 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1189 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1190 type_t *const unqual_type_left = get_unqualified_type(type_left);
1191 type_t *const unqual_type_right = get_unqualified_type(type_right);
1192 if (types_compatible(unqual_type_left, unqual_type_right)) {
1193 return ASSIGN_SUCCESS;
1195 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1196 return ASSIGN_WARNING_INT_FROM_POINTER;
1199 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1200 return ASSIGN_SUCCESS;
1202 return ASSIGN_ERROR_INCOMPATIBLE;
1205 static expression_t *parse_constant_expression(void)
1207 expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1209 if (!is_constant_expression(result)) {
1210 errorf(&result->base.source_position,
1211 "expression '%E' is not constant", result);
1217 static expression_t *parse_assignment_expression(void)
1219 return parse_sub_expression(PREC_ASSIGNMENT);
1222 static string_t parse_string_literals(void)
1224 assert(token.type == T_STRING_LITERAL);
1225 string_t result = token.v.string;
1229 while (token.type == T_STRING_LITERAL) {
1230 result = concat_strings(&result, &token.v.string);
1237 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1238 [GNU_AK_CONST] = "const",
1239 [GNU_AK_VOLATILE] = "volatile",
1240 [GNU_AK_CDECL] = "cdecl",
1241 [GNU_AK_STDCALL] = "stdcall",
1242 [GNU_AK_FASTCALL] = "fastcall",
1243 [GNU_AK_DEPRECATED] = "deprecated",
1244 [GNU_AK_NOINLINE] = "noinline",
1245 [GNU_AK_RETURNS_TWICE] = "returns_twice",
1246 [GNU_AK_NORETURN] = "noreturn",
1247 [GNU_AK_NAKED] = "naked",
1248 [GNU_AK_PURE] = "pure",
1249 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1250 [GNU_AK_MALLOC] = "malloc",
1251 [GNU_AK_WEAK] = "weak",
1252 [GNU_AK_CONSTRUCTOR] = "constructor",
1253 [GNU_AK_DESTRUCTOR] = "destructor",
1254 [GNU_AK_NOTHROW] = "nothrow",
1255 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1256 [GNU_AK_COMMON] = "common",
1257 [GNU_AK_NOCOMMON] = "nocommon",
1258 [GNU_AK_PACKED] = "packed",
1259 [GNU_AK_SHARED] = "shared",
1260 [GNU_AK_NOTSHARED] = "notshared",
1261 [GNU_AK_USED] = "used",
1262 [GNU_AK_UNUSED] = "unused",
1263 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1264 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1265 [GNU_AK_LONGCALL] = "longcall",
1266 [GNU_AK_SHORTCALL] = "shortcall",
1267 [GNU_AK_LONG_CALL] = "long_call",
1268 [GNU_AK_SHORT_CALL] = "short_call",
1269 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1270 [GNU_AK_INTERRUPT] = "interrupt",
1271 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1272 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1273 [GNU_AK_NESTING] = "nesting",
1274 [GNU_AK_NEAR] = "near",
1275 [GNU_AK_FAR] = "far",
1276 [GNU_AK_SIGNAL] = "signal",
1277 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1278 [GNU_AK_TINY_DATA] = "tiny_data",
1279 [GNU_AK_SAVEALL] = "saveall",
1280 [GNU_AK_FLATTEN] = "flatten",
1281 [GNU_AK_SSEREGPARM] = "sseregparm",
1282 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1283 [GNU_AK_RETURN_TWICE] = "return_twice",
1284 [GNU_AK_MAY_ALIAS] = "may_alias",
1285 [GNU_AK_MS_STRUCT] = "ms_struct",
1286 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1287 [GNU_AK_DLLIMPORT] = "dllimport",
1288 [GNU_AK_DLLEXPORT] = "dllexport",
1289 [GNU_AK_ALIGNED] = "aligned",
1290 [GNU_AK_ALIAS] = "alias",
1291 [GNU_AK_SECTION] = "section",
1292 [GNU_AK_FORMAT] = "format",
1293 [GNU_AK_FORMAT_ARG] = "format_arg",
1294 [GNU_AK_WEAKREF] = "weakref",
1295 [GNU_AK_NONNULL] = "nonnull",
1296 [GNU_AK_TLS_MODEL] = "tls_model",
1297 [GNU_AK_VISIBILITY] = "visibility",
1298 [GNU_AK_REGPARM] = "regparm",
1299 [GNU_AK_MODE] = "mode",
1300 [GNU_AK_MODEL] = "model",
1301 [GNU_AK_TRAP_EXIT] = "trap_exit",
1302 [GNU_AK_SP_SWITCH] = "sp_switch",
1303 [GNU_AK_SENTINEL] = "sentinel"
1307 * compare two string, ignoring double underscores on the second.
1309 static int strcmp_underscore(const char *s1, const char *s2)
1311 if (s2[0] == '_' && s2[1] == '_') {
1312 size_t len2 = strlen(s2);
1313 size_t len1 = strlen(s1);
1314 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1315 return strncmp(s1, s2+2, len2-4);
1319 return strcmp(s1, s2);
1323 * Allocate a new gnu temporal attribute of given kind.
1325 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1327 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1328 attribute->kind = kind;
1329 attribute->next = NULL;
1330 attribute->invalid = false;
1331 attribute->have_arguments = false;
1337 * Parse one constant expression argument of the given attribute.
1339 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1341 expression_t *expression;
1342 add_anchor_token(')');
1343 expression = parse_constant_expression();
1344 rem_anchor_token(')');
1345 expect(')', end_error);
1346 attribute->u.argument = fold_constant(expression);
1349 attribute->invalid = true;
1353 * Parse a list of constant expressions arguments of the given attribute.
1355 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1357 argument_list_t **list = &attribute->u.arguments;
1358 argument_list_t *entry;
1359 expression_t *expression;
1360 add_anchor_token(')');
1361 add_anchor_token(',');
1363 expression = parse_constant_expression();
1364 entry = obstack_alloc(&temp_obst, sizeof(entry));
1365 entry->argument = fold_constant(expression);
1368 list = &entry->next;
1369 if (token.type != ',')
1373 rem_anchor_token(',');
1374 rem_anchor_token(')');
1375 expect(')', end_error);
1378 attribute->invalid = true;
1382 * Parse one string literal argument of the given attribute.
1384 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1387 add_anchor_token('(');
1388 if (token.type != T_STRING_LITERAL) {
1389 parse_error_expected("while parsing attribute directive",
1390 T_STRING_LITERAL, NULL);
1393 *string = parse_string_literals();
1394 rem_anchor_token('(');
1395 expect(')', end_error);
1398 attribute->invalid = true;
1402 * Parse one tls model of the given attribute.
1404 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1406 static const char *const tls_models[] = {
1412 string_t string = { NULL, 0 };
1413 parse_gnu_attribute_string_arg(attribute, &string);
1414 if (string.begin != NULL) {
1415 for (size_t i = 0; i < 4; ++i) {
1416 if (strcmp(tls_models[i], string.begin) == 0) {
1417 attribute->u.value = i;
1421 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1423 attribute->invalid = true;
1427 * Parse one tls model of the given attribute.
1429 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1431 static const char *const visibilities[] = {
1437 string_t string = { NULL, 0 };
1438 parse_gnu_attribute_string_arg(attribute, &string);
1439 if (string.begin != NULL) {
1440 for (size_t i = 0; i < 4; ++i) {
1441 if (strcmp(visibilities[i], string.begin) == 0) {
1442 attribute->u.value = i;
1446 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1448 attribute->invalid = true;
1452 * Parse one (code) model of the given attribute.
1454 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1456 static const char *const visibilities[] = {
1461 string_t string = { NULL, 0 };
1462 parse_gnu_attribute_string_arg(attribute, &string);
1463 if (string.begin != NULL) {
1464 for (int i = 0; i < 3; ++i) {
1465 if (strcmp(visibilities[i], string.begin) == 0) {
1466 attribute->u.value = i;
1470 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1472 attribute->invalid = true;
1476 * Parse one mode of the given attribute.
1478 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1480 /* TODO: find out what is allowed here... */
1482 /* at least: byte, word, pointer, list of machine modes
1483 * __XXX___ is interpreted as XXX */
1484 add_anchor_token(')');
1486 if (token.type != T_IDENTIFIER) {
1487 expect(T_IDENTIFIER, end_error);
1490 /* This isn't really correct, the backend should provide a list of machine
1491 * specific modes (according to gcc philosophy that is...) */
1492 const char *symbol_str = token.v.symbol->string;
1493 if (strcmp_underscore("QI", symbol_str) == 0 ||
1494 strcmp_underscore("byte", symbol_str) == 0) {
1495 attribute->u.akind = ATOMIC_TYPE_CHAR;
1496 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1497 attribute->u.akind = ATOMIC_TYPE_SHORT;
1498 } else if (strcmp_underscore("SI", symbol_str) == 0
1499 || strcmp_underscore("word", symbol_str) == 0
1500 || strcmp_underscore("pointer", symbol_str) == 0) {
1501 attribute->u.akind = ATOMIC_TYPE_INT;
1502 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1503 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1506 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1507 attribute->invalid = true;
1511 rem_anchor_token(')');
1512 expect(')', end_error);
1515 attribute->invalid = true;
1519 * Parse one interrupt argument of the given attribute.
1521 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1523 static const char *const interrupts[] = {
1530 string_t string = { NULL, 0 };
1531 parse_gnu_attribute_string_arg(attribute, &string);
1532 if (string.begin != NULL) {
1533 for (size_t i = 0; i < 5; ++i) {
1534 if (strcmp(interrupts[i], string.begin) == 0) {
1535 attribute->u.value = i;
1539 errorf(HERE, "'%s' is not an interrupt", string.begin);
1541 attribute->invalid = true;
1545 * Parse ( identifier, const expression, const expression )
1547 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1549 static const char *const format_names[] = {
1557 if (token.type != T_IDENTIFIER) {
1558 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1561 const char *name = token.v.symbol->string;
1562 for (i = 0; i < 4; ++i) {
1563 if (strcmp_underscore(format_names[i], name) == 0)
1567 if (warning.attribute)
1568 warningf(HERE, "'%s' is an unrecognized format function type", name);
1572 expect(',', end_error);
1573 add_anchor_token(')');
1574 add_anchor_token(',');
1575 parse_constant_expression();
1576 rem_anchor_token(',');
1577 rem_anchor_token(')');
1579 expect(',', end_error);
1580 add_anchor_token(')');
1581 parse_constant_expression();
1582 rem_anchor_token(')');
1583 expect(')', end_error);
1586 attribute->u.value = true;
1590 * Check that a given GNU attribute has no arguments.
1592 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1594 if (!attribute->have_arguments)
1597 /* should have no arguments */
1598 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1599 eat_until_matching_token('(');
1600 /* we have already consumed '(', so we stop before ')', eat it */
1602 attribute->invalid = true;
1606 * Parse one GNU attribute.
1608 * Note that attribute names can be specified WITH or WITHOUT
1609 * double underscores, ie const or __const__.
1611 * The following attributes are parsed without arguments
1636 * no_instrument_function
1637 * warn_unused_result
1654 * externally_visible
1662 * The following attributes are parsed with arguments
1663 * aligned( const expression )
1664 * alias( string literal )
1665 * section( string literal )
1666 * format( identifier, const expression, const expression )
1667 * format_arg( const expression )
1668 * tls_model( string literal )
1669 * visibility( string literal )
1670 * regparm( const expression )
1671 * model( string leteral )
1672 * trap_exit( const expression )
1673 * sp_switch( string literal )
1675 * The following attributes might have arguments
1676 * weak_ref( string literal )
1677 * non_null( const expression // ',' )
1678 * interrupt( string literal )
1679 * sentinel( constant expression )
1681 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1683 gnu_attribute_t *head = *attributes;
1684 gnu_attribute_t *last = *attributes;
1685 decl_modifiers_t modifiers = 0;
1686 gnu_attribute_t *attribute;
1688 eat(T___attribute__);
1689 expect('(', end_error);
1690 expect('(', end_error);
1692 if (token.type != ')') {
1693 /* find the end of the list */
1695 while (last->next != NULL)
1699 /* non-empty attribute list */
1702 if (token.type == T_const) {
1704 } else if (token.type == T_volatile) {
1706 } else if (token.type == T_cdecl) {
1707 /* __attribute__((cdecl)), WITH ms mode */
1709 } else if (token.type == T_IDENTIFIER) {
1710 const symbol_t *sym = token.v.symbol;
1713 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1720 for (i = 0; i < GNU_AK_LAST; ++i) {
1721 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1724 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1727 if (kind == GNU_AK_LAST) {
1728 if (warning.attribute)
1729 warningf(HERE, "'%s' attribute directive ignored", name);
1731 /* skip possible arguments */
1732 if (token.type == '(') {
1733 eat_until_matching_token(')');
1736 /* check for arguments */
1737 attribute = allocate_gnu_attribute(kind);
1738 if (token.type == '(') {
1740 if (token.type == ')') {
1741 /* empty args are allowed */
1744 attribute->have_arguments = true;
1748 case GNU_AK_VOLATILE:
1753 case GNU_AK_NOCOMMON:
1755 case GNU_AK_NOTSHARED:
1756 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1757 case GNU_AK_WARN_UNUSED_RESULT:
1758 case GNU_AK_LONGCALL:
1759 case GNU_AK_SHORTCALL:
1760 case GNU_AK_LONG_CALL:
1761 case GNU_AK_SHORT_CALL:
1762 case GNU_AK_FUNCTION_VECTOR:
1763 case GNU_AK_INTERRUPT_HANDLER:
1764 case GNU_AK_NMI_HANDLER:
1765 case GNU_AK_NESTING:
1769 case GNU_AK_EIGTHBIT_DATA:
1770 case GNU_AK_TINY_DATA:
1771 case GNU_AK_SAVEALL:
1772 case GNU_AK_FLATTEN:
1773 case GNU_AK_SSEREGPARM:
1774 case GNU_AK_EXTERNALLY_VISIBLE:
1775 case GNU_AK_RETURN_TWICE:
1776 case GNU_AK_MAY_ALIAS:
1777 case GNU_AK_MS_STRUCT:
1778 case GNU_AK_GCC_STRUCT:
1781 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1782 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1783 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1784 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1785 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1786 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1787 case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg;
1788 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1789 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1790 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1791 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1792 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1793 case GNU_AK_RETURNS_TWICE: modifiers |= DM_RETURNS_TWICE; goto no_arg;
1794 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1795 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1796 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1797 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1798 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1799 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1801 case GNU_AK_ALIGNED:
1802 /* __align__ may be used without an argument */
1803 if (attribute->have_arguments) {
1804 parse_gnu_attribute_const_arg(attribute);
1808 case GNU_AK_FORMAT_ARG:
1809 case GNU_AK_REGPARM:
1810 case GNU_AK_TRAP_EXIT:
1811 if (!attribute->have_arguments) {
1812 /* should have arguments */
1813 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1814 attribute->invalid = true;
1816 parse_gnu_attribute_const_arg(attribute);
1819 case GNU_AK_SECTION:
1820 case GNU_AK_SP_SWITCH:
1821 if (!attribute->have_arguments) {
1822 /* should have arguments */
1823 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1824 attribute->invalid = true;
1826 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1829 if (!attribute->have_arguments) {
1830 /* should have arguments */
1831 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1832 attribute->invalid = true;
1834 parse_gnu_attribute_format_args(attribute);
1836 case GNU_AK_WEAKREF:
1837 /* may have one string argument */
1838 if (attribute->have_arguments)
1839 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1841 case GNU_AK_NONNULL:
1842 if (attribute->have_arguments)
1843 parse_gnu_attribute_const_arg_list(attribute);
1845 case GNU_AK_TLS_MODEL:
1846 if (!attribute->have_arguments) {
1847 /* should have arguments */
1848 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1850 parse_gnu_attribute_tls_model_arg(attribute);
1852 case GNU_AK_VISIBILITY:
1853 if (!attribute->have_arguments) {
1854 /* should have arguments */
1855 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1857 parse_gnu_attribute_visibility_arg(attribute);
1860 if (!attribute->have_arguments) {
1861 /* should have arguments */
1862 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1864 parse_gnu_attribute_model_arg(attribute);
1868 if (!attribute->have_arguments) {
1869 /* should have arguments */
1870 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1872 parse_gnu_attribute_mode_arg(attribute);
1875 case GNU_AK_INTERRUPT:
1876 /* may have one string argument */
1877 if (attribute->have_arguments)
1878 parse_gnu_attribute_interrupt_arg(attribute);
1880 case GNU_AK_SENTINEL:
1881 /* may have one string argument */
1882 if (attribute->have_arguments)
1883 parse_gnu_attribute_const_arg(attribute);
1886 /* already handled */
1890 check_no_argument(attribute, name);
1893 if (attribute != NULL) {
1895 last->next = attribute;
1898 head = last = attribute;
1902 if (token.type != ',')
1907 expect(')', end_error);
1908 expect(')', end_error);
1916 * Parse GNU attributes.
1918 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1920 decl_modifiers_t modifiers = 0;
1923 switch (token.type) {
1924 case T___attribute__:
1925 modifiers |= parse_gnu_attribute(attributes);
1930 expect('(', end_error);
1931 if (token.type != T_STRING_LITERAL) {
1932 parse_error_expected("while parsing assembler attribute",
1933 T_STRING_LITERAL, NULL);
1934 eat_until_matching_token('(');
1937 parse_string_literals();
1939 expect(')', end_error);
1942 case T_cdecl: modifiers |= DM_CDECL; break;
1943 case T__fastcall: modifiers |= DM_FASTCALL; break;
1944 case T__stdcall: modifiers |= DM_STDCALL; break;
1947 /* TODO record modifier */
1949 warningf(HERE, "Ignoring declaration modifier %K", &token);
1953 default: return modifiers;
1960 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1962 static entity_t *determine_lhs_ent(expression_t *const expr,
1965 switch (expr->kind) {
1966 case EXPR_REFERENCE: {
1967 entity_t *const entity = expr->reference.entity;
1968 /* we should only find variables as lvalues... */
1969 if (entity->base.kind != ENTITY_VARIABLE
1970 && entity->base.kind != ENTITY_PARAMETER)
1976 case EXPR_ARRAY_ACCESS: {
1977 expression_t *const ref = expr->array_access.array_ref;
1978 entity_t * ent = NULL;
1979 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1980 ent = determine_lhs_ent(ref, lhs_ent);
1983 mark_vars_read(expr->select.compound, lhs_ent);
1985 mark_vars_read(expr->array_access.index, lhs_ent);
1990 if (is_type_compound(skip_typeref(expr->base.type))) {
1991 return determine_lhs_ent(expr->select.compound, lhs_ent);
1993 mark_vars_read(expr->select.compound, lhs_ent);
1998 case EXPR_UNARY_DEREFERENCE: {
1999 expression_t *const val = expr->unary.value;
2000 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
2002 return determine_lhs_ent(val->unary.value, lhs_ent);
2004 mark_vars_read(val, NULL);
2010 mark_vars_read(expr, NULL);
2015 #define ENT_ANY ((entity_t*)-1)
2018 * Mark declarations, which are read. This is used to detect variables, which
2022 * x is not marked as "read", because it is only read to calculate its own new
2026 * x and y are not detected as "not read", because multiple variables are
2029 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
2031 switch (expr->kind) {
2032 case EXPR_REFERENCE: {
2033 entity_t *const entity = expr->reference.entity;
2034 if (entity->kind != ENTITY_VARIABLE
2035 && entity->kind != ENTITY_PARAMETER)
2038 if (lhs_ent != entity && lhs_ent != ENT_ANY) {
2039 if (entity->kind == ENTITY_VARIABLE) {
2040 entity->variable.read = true;
2042 entity->parameter.read = true;
2049 // TODO respect pure/const
2050 mark_vars_read(expr->call.function, NULL);
2051 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
2052 mark_vars_read(arg->expression, NULL);
2056 case EXPR_CONDITIONAL:
2057 // TODO lhs_decl should depend on whether true/false have an effect
2058 mark_vars_read(expr->conditional.condition, NULL);
2059 if (expr->conditional.true_expression != NULL)
2060 mark_vars_read(expr->conditional.true_expression, lhs_ent);
2061 mark_vars_read(expr->conditional.false_expression, lhs_ent);
2065 if (lhs_ent == ENT_ANY
2066 && !is_type_compound(skip_typeref(expr->base.type)))
2068 mark_vars_read(expr->select.compound, lhs_ent);
2071 case EXPR_ARRAY_ACCESS: {
2072 expression_t *const ref = expr->array_access.array_ref;
2073 mark_vars_read(ref, lhs_ent);
2074 lhs_ent = determine_lhs_ent(ref, lhs_ent);
2075 mark_vars_read(expr->array_access.index, lhs_ent);
2080 mark_vars_read(expr->va_arge.ap, lhs_ent);
2083 case EXPR_UNARY_CAST:
2084 /* Special case: Use void cast to mark a variable as "read" */
2085 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
2090 case EXPR_UNARY_THROW:
2091 if (expr->unary.value == NULL)
2094 case EXPR_UNARY_DEREFERENCE:
2095 case EXPR_UNARY_DELETE:
2096 case EXPR_UNARY_DELETE_ARRAY:
2097 if (lhs_ent == ENT_ANY)
2101 case EXPR_UNARY_NEGATE:
2102 case EXPR_UNARY_PLUS:
2103 case EXPR_UNARY_BITWISE_NEGATE:
2104 case EXPR_UNARY_NOT:
2105 case EXPR_UNARY_TAKE_ADDRESS:
2106 case EXPR_UNARY_POSTFIX_INCREMENT:
2107 case EXPR_UNARY_POSTFIX_DECREMENT:
2108 case EXPR_UNARY_PREFIX_INCREMENT:
2109 case EXPR_UNARY_PREFIX_DECREMENT:
2110 case EXPR_UNARY_CAST_IMPLICIT:
2111 case EXPR_UNARY_ASSUME:
2113 mark_vars_read(expr->unary.value, lhs_ent);
2116 case EXPR_BINARY_ADD:
2117 case EXPR_BINARY_SUB:
2118 case EXPR_BINARY_MUL:
2119 case EXPR_BINARY_DIV:
2120 case EXPR_BINARY_MOD:
2121 case EXPR_BINARY_EQUAL:
2122 case EXPR_BINARY_NOTEQUAL:
2123 case EXPR_BINARY_LESS:
2124 case EXPR_BINARY_LESSEQUAL:
2125 case EXPR_BINARY_GREATER:
2126 case EXPR_BINARY_GREATEREQUAL:
2127 case EXPR_BINARY_BITWISE_AND:
2128 case EXPR_BINARY_BITWISE_OR:
2129 case EXPR_BINARY_BITWISE_XOR:
2130 case EXPR_BINARY_LOGICAL_AND:
2131 case EXPR_BINARY_LOGICAL_OR:
2132 case EXPR_BINARY_SHIFTLEFT:
2133 case EXPR_BINARY_SHIFTRIGHT:
2134 case EXPR_BINARY_COMMA:
2135 case EXPR_BINARY_ISGREATER:
2136 case EXPR_BINARY_ISGREATEREQUAL:
2137 case EXPR_BINARY_ISLESS:
2138 case EXPR_BINARY_ISLESSEQUAL:
2139 case EXPR_BINARY_ISLESSGREATER:
2140 case EXPR_BINARY_ISUNORDERED:
2141 mark_vars_read(expr->binary.left, lhs_ent);
2142 mark_vars_read(expr->binary.right, lhs_ent);
2145 case EXPR_BINARY_ASSIGN:
2146 case EXPR_BINARY_MUL_ASSIGN:
2147 case EXPR_BINARY_DIV_ASSIGN:
2148 case EXPR_BINARY_MOD_ASSIGN:
2149 case EXPR_BINARY_ADD_ASSIGN:
2150 case EXPR_BINARY_SUB_ASSIGN:
2151 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2152 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2153 case EXPR_BINARY_BITWISE_AND_ASSIGN:
2154 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2155 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
2156 if (lhs_ent == ENT_ANY)
2158 lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
2159 mark_vars_read(expr->binary.right, lhs_ent);
2164 determine_lhs_ent(expr->va_starte.ap, lhs_ent);
2170 case EXPR_CHARACTER_CONSTANT:
2171 case EXPR_WIDE_CHARACTER_CONSTANT:
2172 case EXPR_STRING_LITERAL:
2173 case EXPR_WIDE_STRING_LITERAL:
2174 case EXPR_COMPOUND_LITERAL: // TODO init?
2176 case EXPR_CLASSIFY_TYPE:
2179 case EXPR_BUILTIN_SYMBOL:
2180 case EXPR_BUILTIN_CONSTANT_P:
2181 case EXPR_BUILTIN_PREFETCH:
2183 case EXPR_STATEMENT: // TODO
2184 case EXPR_LABEL_ADDRESS:
2185 case EXPR_REFERENCE_ENUM_VALUE:
2189 panic("unhandled expression");
2192 static designator_t *parse_designation(void)
2194 designator_t *result = NULL;
2195 designator_t *last = NULL;
2198 designator_t *designator;
2199 switch (token.type) {
2201 designator = allocate_ast_zero(sizeof(designator[0]));
2202 designator->source_position = token.source_position;
2204 add_anchor_token(']');
2205 designator->array_index = parse_constant_expression();
2206 rem_anchor_token(']');
2207 expect(']', end_error);
2210 designator = allocate_ast_zero(sizeof(designator[0]));
2211 designator->source_position = token.source_position;
2213 if (token.type != T_IDENTIFIER) {
2214 parse_error_expected("while parsing designator",
2215 T_IDENTIFIER, NULL);
2218 designator->symbol = token.v.symbol;
2222 expect('=', end_error);
2226 assert(designator != NULL);
2228 last->next = designator;
2230 result = designator;
2238 static initializer_t *initializer_from_string(array_type_t *type,
2239 const string_t *const string)
2241 /* TODO: check len vs. size of array type */
2244 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
2245 initializer->string.string = *string;
2250 static initializer_t *initializer_from_wide_string(array_type_t *const type,
2251 wide_string_t *const string)
2253 /* TODO: check len vs. size of array type */
2256 initializer_t *const initializer =
2257 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
2258 initializer->wide_string.string = *string;
2264 * Build an initializer from a given expression.
2266 static initializer_t *initializer_from_expression(type_t *orig_type,
2267 expression_t *expression)
2269 /* TODO check that expression is a constant expression */
2271 /* § 6.7.8.14/15 char array may be initialized by string literals */
2272 type_t *type = skip_typeref(orig_type);
2273 type_t *expr_type_orig = expression->base.type;
2274 type_t *expr_type = skip_typeref(expr_type_orig);
2275 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
2276 array_type_t *const array_type = &type->array;
2277 type_t *const element_type = skip_typeref(array_type->element_type);
2279 if (element_type->kind == TYPE_ATOMIC) {
2280 atomic_type_kind_t akind = element_type->atomic.akind;
2281 switch (expression->kind) {
2282 case EXPR_STRING_LITERAL:
2283 if (akind == ATOMIC_TYPE_CHAR
2284 || akind == ATOMIC_TYPE_SCHAR
2285 || akind == ATOMIC_TYPE_UCHAR) {
2286 return initializer_from_string(array_type,
2287 &expression->string.value);
2290 case EXPR_WIDE_STRING_LITERAL: {
2291 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
2292 if (get_unqualified_type(element_type) == bare_wchar_type) {
2293 return initializer_from_wide_string(array_type,
2294 &expression->wide_string.value);
2304 assign_error_t error = semantic_assign(type, expression);
2305 if (error == ASSIGN_ERROR_INCOMPATIBLE)
2307 report_assign_error(error, type, expression, "initializer",
2308 &expression->base.source_position);
2310 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2312 if (type->kind == TYPE_BITFIELD) {
2313 type = type->bitfield.base_type;
2316 result->value.value = create_implicit_cast(expression, type);
2322 * Checks if a given expression can be used as an constant initializer.
2324 static bool is_initializer_constant(const expression_t *expression)
2326 return is_constant_expression(expression)
2327 || is_address_constant(expression);
2331 * Parses an scalar initializer.
2333 * § 6.7.8.11; eat {} without warning
2335 static initializer_t *parse_scalar_initializer(type_t *type,
2336 bool must_be_constant)
2338 /* there might be extra {} hierarchies */
2340 if (token.type == '{') {
2342 warningf(HERE, "extra curly braces around scalar initializer");
2346 } while (token.type == '{');
2349 expression_t *expression = parse_assignment_expression();
2350 mark_vars_read(expression, NULL);
2351 if (must_be_constant && !is_initializer_constant(expression)) {
2352 errorf(&expression->base.source_position,
2353 "Initialisation expression '%E' is not constant",
2357 initializer_t *initializer = initializer_from_expression(type, expression);
2359 if (initializer == NULL) {
2360 errorf(&expression->base.source_position,
2361 "expression '%E' (type '%T') doesn't match expected type '%T'",
2362 expression, expression->base.type, type);
2367 bool additional_warning_displayed = false;
2368 while (braces > 0) {
2369 if (token.type == ',') {
2372 if (token.type != '}') {
2373 if (!additional_warning_displayed && warning.other) {
2374 warningf(HERE, "additional elements in scalar initializer");
2375 additional_warning_displayed = true;
2386 * An entry in the type path.
2388 typedef struct type_path_entry_t type_path_entry_t;
2389 struct type_path_entry_t {
2390 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2392 size_t index; /**< For array types: the current index. */
2393 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2398 * A type path expression a position inside compound or array types.
2400 typedef struct type_path_t type_path_t;
2401 struct type_path_t {
2402 type_path_entry_t *path; /**< An flexible array containing the current path. */
2403 type_t *top_type; /**< type of the element the path points */
2404 size_t max_index; /**< largest index in outermost array */
2408 * Prints a type path for debugging.
2410 static __attribute__((unused)) void debug_print_type_path(
2411 const type_path_t *path)
2413 size_t len = ARR_LEN(path->path);
2415 for (size_t i = 0; i < len; ++i) {
2416 const type_path_entry_t *entry = & path->path[i];
2418 type_t *type = skip_typeref(entry->type);
2419 if (is_type_compound(type)) {
2420 /* in gcc mode structs can have no members */
2421 if (entry->v.compound_entry == NULL) {
2425 fprintf(stderr, ".%s",
2426 entry->v.compound_entry->base.symbol->string);
2427 } else if (is_type_array(type)) {
2428 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
2430 fprintf(stderr, "-INVALID-");
2433 if (path->top_type != NULL) {
2434 fprintf(stderr, " (");
2435 print_type(path->top_type);
2436 fprintf(stderr, ")");
2441 * Return the top type path entry, ie. in a path
2442 * (type).a.b returns the b.
2444 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2446 size_t len = ARR_LEN(path->path);
2448 return &path->path[len-1];
2452 * Enlarge the type path by an (empty) element.
2454 static type_path_entry_t *append_to_type_path(type_path_t *path)
2456 size_t len = ARR_LEN(path->path);
2457 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2459 type_path_entry_t *result = & path->path[len];
2460 memset(result, 0, sizeof(result[0]));
2465 * Descending into a sub-type. Enter the scope of the current top_type.
2467 static void descend_into_subtype(type_path_t *path)
2469 type_t *orig_top_type = path->top_type;
2470 type_t *top_type = skip_typeref(orig_top_type);
2472 type_path_entry_t *top = append_to_type_path(path);
2473 top->type = top_type;
2475 if (is_type_compound(top_type)) {
2476 compound_t *compound = top_type->compound.compound;
2477 entity_t *entry = compound->members.entities;
2479 if (entry != NULL) {
2480 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2481 top->v.compound_entry = &entry->declaration;
2482 path->top_type = entry->declaration.type;
2484 path->top_type = NULL;
2486 } else if (is_type_array(top_type)) {
2488 path->top_type = top_type->array.element_type;
2490 assert(!is_type_valid(top_type));
2495 * Pop an entry from the given type path, ie. returning from
2496 * (type).a.b to (type).a
2498 static void ascend_from_subtype(type_path_t *path)
2500 type_path_entry_t *top = get_type_path_top(path);
2502 path->top_type = top->type;
2504 size_t len = ARR_LEN(path->path);
2505 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2509 * Pop entries from the given type path until the given
2510 * path level is reached.
2512 static void ascend_to(type_path_t *path, size_t top_path_level)
2514 size_t len = ARR_LEN(path->path);
2516 while (len > top_path_level) {
2517 ascend_from_subtype(path);
2518 len = ARR_LEN(path->path);
2522 static bool walk_designator(type_path_t *path, const designator_t *designator,
2523 bool used_in_offsetof)
2525 for (; designator != NULL; designator = designator->next) {
2526 type_path_entry_t *top = get_type_path_top(path);
2527 type_t *orig_type = top->type;
2529 type_t *type = skip_typeref(orig_type);
2531 if (designator->symbol != NULL) {
2532 symbol_t *symbol = designator->symbol;
2533 if (!is_type_compound(type)) {
2534 if (is_type_valid(type)) {
2535 errorf(&designator->source_position,
2536 "'.%Y' designator used for non-compound type '%T'",
2540 top->type = type_error_type;
2541 top->v.compound_entry = NULL;
2542 orig_type = type_error_type;
2544 compound_t *compound = type->compound.compound;
2545 entity_t *iter = compound->members.entities;
2546 for (; iter != NULL; iter = iter->base.next) {
2547 if (iter->base.symbol == symbol) {
2552 errorf(&designator->source_position,
2553 "'%T' has no member named '%Y'", orig_type, symbol);
2556 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2557 if (used_in_offsetof) {
2558 type_t *real_type = skip_typeref(iter->declaration.type);
2559 if (real_type->kind == TYPE_BITFIELD) {
2560 errorf(&designator->source_position,
2561 "offsetof designator '%Y' may not specify bitfield",
2567 top->type = orig_type;
2568 top->v.compound_entry = &iter->declaration;
2569 orig_type = iter->declaration.type;
2572 expression_t *array_index = designator->array_index;
2573 assert(designator->array_index != NULL);
2575 if (!is_type_array(type)) {
2576 if (is_type_valid(type)) {
2577 errorf(&designator->source_position,
2578 "[%E] designator used for non-array type '%T'",
2579 array_index, orig_type);
2584 long index = fold_constant(array_index);
2585 if (!used_in_offsetof) {
2587 errorf(&designator->source_position,
2588 "array index [%E] must be positive", array_index);
2589 } else if (type->array.size_constant) {
2590 long array_size = type->array.size;
2591 if (index >= array_size) {
2592 errorf(&designator->source_position,
2593 "designator [%E] (%d) exceeds array size %d",
2594 array_index, index, array_size);
2599 top->type = orig_type;
2600 top->v.index = (size_t) index;
2601 orig_type = type->array.element_type;
2603 path->top_type = orig_type;
2605 if (designator->next != NULL) {
2606 descend_into_subtype(path);
2615 static void advance_current_object(type_path_t *path, size_t top_path_level)
2617 type_path_entry_t *top = get_type_path_top(path);
2619 type_t *type = skip_typeref(top->type);
2620 if (is_type_union(type)) {
2621 /* in unions only the first element is initialized */
2622 top->v.compound_entry = NULL;
2623 } else if (is_type_struct(type)) {
2624 declaration_t *entry = top->v.compound_entry;
2626 entity_t *next_entity = entry->base.next;
2627 if (next_entity != NULL) {
2628 assert(is_declaration(next_entity));
2629 entry = &next_entity->declaration;
2634 top->v.compound_entry = entry;
2635 if (entry != NULL) {
2636 path->top_type = entry->type;
2639 } else if (is_type_array(type)) {
2640 assert(is_type_array(type));
2644 if (!type->array.size_constant || top->v.index < type->array.size) {
2648 assert(!is_type_valid(type));
2652 /* we're past the last member of the current sub-aggregate, try if we
2653 * can ascend in the type hierarchy and continue with another subobject */
2654 size_t len = ARR_LEN(path->path);
2656 if (len > top_path_level) {
2657 ascend_from_subtype(path);
2658 advance_current_object(path, top_path_level);
2660 path->top_type = NULL;
2665 * skip until token is found.
2667 static void skip_until(int type)
2669 while (token.type != type) {
2670 if (token.type == T_EOF)
2677 * skip any {...} blocks until a closing bracket is reached.
2679 static void skip_initializers(void)
2681 if (token.type == '{')
2684 while (token.type != '}') {
2685 if (token.type == T_EOF)
2687 if (token.type == '{') {
2695 static initializer_t *create_empty_initializer(void)
2697 static initializer_t empty_initializer
2698 = { .list = { { INITIALIZER_LIST }, 0 } };
2699 return &empty_initializer;
2703 * Parse a part of an initialiser for a struct or union,
2705 static initializer_t *parse_sub_initializer(type_path_t *path,
2706 type_t *outer_type, size_t top_path_level,
2707 parse_initializer_env_t *env)
2709 if (token.type == '}') {
2710 /* empty initializer */
2711 return create_empty_initializer();
2714 type_t *orig_type = path->top_type;
2715 type_t *type = NULL;
2717 if (orig_type == NULL) {
2718 /* We are initializing an empty compound. */
2720 type = skip_typeref(orig_type);
2723 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2726 designator_t *designator = NULL;
2727 if (token.type == '.' || token.type == '[') {
2728 designator = parse_designation();
2729 goto finish_designator;
2730 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2731 /* GNU-style designator ("identifier: value") */
2732 designator = allocate_ast_zero(sizeof(designator[0]));
2733 designator->source_position = token.source_position;
2734 designator->symbol = token.v.symbol;
2739 /* reset path to toplevel, evaluate designator from there */
2740 ascend_to(path, top_path_level);
2741 if (!walk_designator(path, designator, false)) {
2742 /* can't continue after designation error */
2746 initializer_t *designator_initializer
2747 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2748 designator_initializer->designator.designator = designator;
2749 ARR_APP1(initializer_t*, initializers, designator_initializer);
2751 orig_type = path->top_type;
2752 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2757 if (token.type == '{') {
2758 if (type != NULL && is_type_scalar(type)) {
2759 sub = parse_scalar_initializer(type, env->must_be_constant);
2763 if (env->entity != NULL) {
2765 "extra brace group at end of initializer for '%Y'",
2766 env->entity->base.symbol);
2768 errorf(HERE, "extra brace group at end of initializer");
2771 descend_into_subtype(path);
2773 add_anchor_token('}');
2774 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2776 rem_anchor_token('}');
2779 ascend_from_subtype(path);
2780 expect('}', end_error);
2782 expect('}', end_error);
2783 goto error_parse_next;
2787 /* must be an expression */
2788 expression_t *expression = parse_assignment_expression();
2790 if (env->must_be_constant && !is_initializer_constant(expression)) {
2791 errorf(&expression->base.source_position,
2792 "Initialisation expression '%E' is not constant",
2797 /* we are already outside, ... */
2798 type_t *const outer_type_skip = skip_typeref(outer_type);
2799 if (is_type_compound(outer_type_skip) &&
2800 !outer_type_skip->compound.compound->complete) {
2801 goto error_parse_next;
2806 /* handle { "string" } special case */
2807 if ((expression->kind == EXPR_STRING_LITERAL
2808 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2809 && outer_type != NULL) {
2810 sub = initializer_from_expression(outer_type, expression);
2812 if (token.type == ',') {
2815 if (token.type != '}' && warning.other) {
2816 warningf(HERE, "excessive elements in initializer for type '%T'",
2819 /* TODO: eat , ... */
2824 /* descend into subtypes until expression matches type */
2826 orig_type = path->top_type;
2827 type = skip_typeref(orig_type);
2829 sub = initializer_from_expression(orig_type, expression);
2833 if (!is_type_valid(type)) {
2836 if (is_type_scalar(type)) {
2837 errorf(&expression->base.source_position,
2838 "expression '%E' doesn't match expected type '%T'",
2839 expression, orig_type);
2843 descend_into_subtype(path);
2847 /* update largest index of top array */
2848 const type_path_entry_t *first = &path->path[0];
2849 type_t *first_type = first->type;
2850 first_type = skip_typeref(first_type);
2851 if (is_type_array(first_type)) {
2852 size_t index = first->v.index;
2853 if (index > path->max_index)
2854 path->max_index = index;
2858 /* append to initializers list */
2859 ARR_APP1(initializer_t*, initializers, sub);
2862 if (warning.other) {
2863 if (env->entity != NULL) {
2864 warningf(HERE, "excess elements in struct initializer for '%Y'",
2865 env->entity->base.symbol);
2867 warningf(HERE, "excess elements in struct initializer");
2873 if (token.type == '}') {
2876 expect(',', end_error);
2877 if (token.type == '}') {
2882 /* advance to the next declaration if we are not at the end */
2883 advance_current_object(path, top_path_level);
2884 orig_type = path->top_type;
2885 if (orig_type != NULL)
2886 type = skip_typeref(orig_type);
2892 size_t len = ARR_LEN(initializers);
2893 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2894 initializer_t *result = allocate_ast_zero(size);
2895 result->kind = INITIALIZER_LIST;
2896 result->list.len = len;
2897 memcpy(&result->list.initializers, initializers,
2898 len * sizeof(initializers[0]));
2900 DEL_ARR_F(initializers);
2901 ascend_to(path, top_path_level+1);
2906 skip_initializers();
2907 DEL_ARR_F(initializers);
2908 ascend_to(path, top_path_level+1);
2913 * Parses an initializer. Parsers either a compound literal
2914 * (env->declaration == NULL) or an initializer of a declaration.
2916 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2918 type_t *type = skip_typeref(env->type);
2919 size_t max_index = 0xdeadbeaf; // TODO: Resolve this uninitialized variable problem
2920 initializer_t *result;
2922 if (is_type_scalar(type)) {
2923 result = parse_scalar_initializer(type, env->must_be_constant);
2924 } else if (token.type == '{') {
2928 memset(&path, 0, sizeof(path));
2929 path.top_type = env->type;
2930 path.path = NEW_ARR_F(type_path_entry_t, 0);
2932 descend_into_subtype(&path);
2934 add_anchor_token('}');
2935 result = parse_sub_initializer(&path, env->type, 1, env);
2936 rem_anchor_token('}');
2938 max_index = path.max_index;
2939 DEL_ARR_F(path.path);
2941 expect('}', end_error);
2943 /* parse_scalar_initializer() also works in this case: we simply
2944 * have an expression without {} around it */
2945 result = parse_scalar_initializer(type, env->must_be_constant);
2948 /* § 6.7.8 (22) array initializers for arrays with unknown size determine
2949 * the array type size */
2950 if (is_type_array(type) && type->array.size_expression == NULL
2951 && result != NULL) {
2953 switch (result->kind) {
2954 case INITIALIZER_LIST:
2955 assert(max_index != 0xdeadbeaf);
2956 size = max_index + 1;
2959 case INITIALIZER_STRING:
2960 size = result->string.string.size;
2963 case INITIALIZER_WIDE_STRING:
2964 size = result->wide_string.string.size;
2967 case INITIALIZER_DESIGNATOR:
2968 case INITIALIZER_VALUE:
2969 /* can happen for parse errors */
2974 internal_errorf(HERE, "invalid initializer type");
2977 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2978 cnst->base.type = type_size_t;
2979 cnst->conste.v.int_value = size;
2981 type_t *new_type = duplicate_type(type);
2983 new_type->array.size_expression = cnst;
2984 new_type->array.size_constant = true;
2985 new_type->array.has_implicit_size = true;
2986 new_type->array.size = size;
2987 env->type = new_type;
2995 static void append_entity(scope_t *scope, entity_t *entity)
2997 if (scope->last_entity != NULL) {
2998 scope->last_entity->base.next = entity;
3000 scope->entities = entity;
3002 scope->last_entity = entity;
3006 static compound_t *parse_compound_type_specifier(bool is_struct)
3008 gnu_attribute_t *attributes = NULL;
3009 decl_modifiers_t modifiers = 0;
3016 symbol_t *symbol = NULL;
3017 compound_t *compound = NULL;
3019 if (token.type == T___attribute__) {
3020 modifiers |= parse_attributes(&attributes);
3023 if (token.type == T_IDENTIFIER) {
3024 symbol = token.v.symbol;
3027 namespace_tag_t const namespc =
3028 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
3029 entity_t *entity = get_entity(symbol, namespc);
3030 if (entity != NULL) {
3031 assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION));
3032 compound = &entity->compound;
3033 if (compound->base.parent_scope != current_scope &&
3034 (token.type == '{' || token.type == ';')) {
3035 /* we're in an inner scope and have a definition. Override
3036 existing definition in outer scope */
3038 } else if (compound->complete && token.type == '{') {
3039 assert(symbol != NULL);
3040 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
3041 is_struct ? "struct" : "union", symbol,
3042 &compound->base.source_position);
3043 /* clear members in the hope to avoid further errors */
3044 compound->members.entities = NULL;
3047 } else if (token.type != '{') {
3049 parse_error_expected("while parsing struct type specifier",
3050 T_IDENTIFIER, '{', NULL);
3052 parse_error_expected("while parsing union type specifier",
3053 T_IDENTIFIER, '{', NULL);
3059 if (compound == NULL) {
3060 entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
3061 entity_t *entity = allocate_entity_zero(kind);
3062 compound = &entity->compound;
3064 compound->base.namespc =
3065 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
3066 compound->base.source_position = token.source_position;
3067 compound->base.symbol = symbol;
3068 compound->base.parent_scope = current_scope;
3069 if (symbol != NULL) {
3070 environment_push(entity);
3072 append_entity(current_scope, entity);
3075 if (token.type == '{') {
3076 parse_compound_type_entries(compound);
3077 modifiers |= parse_attributes(&attributes);
3079 if (symbol == NULL) {
3080 assert(anonymous_entity == NULL);
3081 anonymous_entity = (entity_t*)compound;
3085 compound->modifiers |= modifiers;
3089 static void parse_enum_entries(type_t *const enum_type)
3093 if (token.type == '}') {
3094 errorf(HERE, "empty enum not allowed");
3099 add_anchor_token('}');
3101 if (token.type != T_IDENTIFIER) {
3102 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
3104 rem_anchor_token('}');
3108 entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE);
3109 entity->enum_value.enum_type = enum_type;
3110 entity->base.symbol = token.v.symbol;
3111 entity->base.source_position = token.source_position;
3114 if (token.type == '=') {
3116 expression_t *value = parse_constant_expression();
3118 value = create_implicit_cast(value, enum_type);
3119 entity->enum_value.value = value;
3124 record_entity(entity, false);
3126 if (token.type != ',')
3129 } while (token.type != '}');
3130 rem_anchor_token('}');
3132 expect('}', end_error);
3138 static type_t *parse_enum_specifier(void)
3140 gnu_attribute_t *attributes = NULL;
3145 if (token.type == T_IDENTIFIER) {
3146 symbol = token.v.symbol;
3149 entity = get_entity(symbol, NAMESPACE_ENUM);
3150 assert(entity == NULL || entity->kind == ENTITY_ENUM);
3151 } else if (token.type != '{') {
3152 parse_error_expected("while parsing enum type specifier",
3153 T_IDENTIFIER, '{', NULL);
3160 if (entity == NULL) {
3161 entity = allocate_entity_zero(ENTITY_ENUM);
3162 entity->base.namespc = NAMESPACE_ENUM;
3163 entity->base.source_position = token.source_position;
3164 entity->base.symbol = symbol;
3165 entity->base.parent_scope = current_scope;
3168 type_t *const type = allocate_type_zero(TYPE_ENUM);
3169 type->enumt.enume = &entity->enume;
3171 if (token.type == '{') {
3172 if (entity->enume.complete) {
3173 errorf(HERE, "multiple definitions of 'enum %Y' (previous definition %P)",
3174 symbol, &entity->base.source_position);
3176 if (symbol != NULL) {
3177 environment_push(entity);
3179 append_entity(current_scope, entity);
3180 entity->enume.complete = true;
3182 parse_enum_entries(type);
3183 parse_attributes(&attributes);
3185 if (symbol == NULL) {
3186 assert(anonymous_entity == NULL);
3187 anonymous_entity = entity;
3189 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
3190 errorf(HERE, "'enum %Y' used before definition (incomplete enums are a GNU extension)",
3198 * if a symbol is a typedef to another type, return true
3200 static bool is_typedef_symbol(symbol_t *symbol)
3202 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
3203 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
3206 static type_t *parse_typeof(void)
3212 expect('(', end_error);
3213 add_anchor_token(')');
3215 expression_t *expression = NULL;
3217 bool old_type_prop = in_type_prop;
3218 bool old_gcc_extension = in_gcc_extension;
3219 in_type_prop = true;
3221 while (token.type == T___extension__) {
3222 /* This can be a prefix to a typename or an expression. */
3224 in_gcc_extension = true;
3226 switch (token.type) {
3228 if (is_typedef_symbol(token.v.symbol)) {
3229 type = parse_typename();
3231 expression = parse_expression();
3232 type = expression->base.type;
3237 type = parse_typename();
3241 expression = parse_expression();
3242 type = expression->base.type;
3245 in_type_prop = old_type_prop;
3246 in_gcc_extension = old_gcc_extension;
3248 rem_anchor_token(')');
3249 expect(')', end_error);
3251 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
3252 typeof_type->typeoft.expression = expression;
3253 typeof_type->typeoft.typeof_type = type;
3260 typedef enum specifiers_t {
3261 SPECIFIER_SIGNED = 1 << 0,
3262 SPECIFIER_UNSIGNED = 1 << 1,
3263 SPECIFIER_LONG = 1 << 2,
3264 SPECIFIER_INT = 1 << 3,
3265 SPECIFIER_DOUBLE = 1 << 4,
3266 SPECIFIER_CHAR = 1 << 5,
3267 SPECIFIER_WCHAR_T = 1 << 6,
3268 SPECIFIER_SHORT = 1 << 7,
3269 SPECIFIER_LONG_LONG = 1 << 8,
3270 SPECIFIER_FLOAT = 1 << 9,
3271 SPECIFIER_BOOL = 1 << 10,
3272 SPECIFIER_VOID = 1 << 11,
3273 SPECIFIER_INT8 = 1 << 12,
3274 SPECIFIER_INT16 = 1 << 13,
3275 SPECIFIER_INT32 = 1 << 14,
3276 SPECIFIER_INT64 = 1 << 15,
3277 SPECIFIER_INT128 = 1 << 16,
3278 SPECIFIER_COMPLEX = 1 << 17,
3279 SPECIFIER_IMAGINARY = 1 << 18,
3282 static type_t *create_builtin_type(symbol_t *const symbol,
3283 type_t *const real_type)
3285 type_t *type = allocate_type_zero(TYPE_BUILTIN);
3286 type->builtin.symbol = symbol;
3287 type->builtin.real_type = real_type;
3289 type_t *result = typehash_insert(type);
3290 if (type != result) {
3297 static type_t *get_typedef_type(symbol_t *symbol)
3299 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3300 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
3303 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
3304 type->typedeft.typedefe = &entity->typedefe;
3310 * check for the allowed MS alignment values.
3312 static bool check_alignment_value(long long intvalue)
3314 if (intvalue < 1 || intvalue > 8192) {
3315 errorf(HERE, "illegal alignment value");
3318 unsigned v = (unsigned)intvalue;
3319 for (unsigned i = 1; i <= 8192; i += i) {
3323 errorf(HERE, "alignment must be power of two");
3327 #define DET_MOD(name, tag) do { \
3328 if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \
3329 *modifiers |= tag; \
3332 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
3334 decl_modifiers_t *modifiers = &specifiers->modifiers;
3337 if (token.type == T_restrict) {
3339 DET_MOD(restrict, DM_RESTRICT);
3341 } else if (token.type != T_IDENTIFIER)
3343 symbol_t *symbol = token.v.symbol;
3344 if (symbol == sym_align) {
3346 expect('(', end_error);
3347 if (token.type != T_INTEGER)
3349 if (check_alignment_value(token.v.intvalue)) {
3350 if (specifiers->alignment != 0 && warning.other)
3351 warningf(HERE, "align used more than once");
3352 specifiers->alignment = (unsigned char)token.v.intvalue;
3355 expect(')', end_error);
3356 } else if (symbol == sym_allocate) {
3358 expect('(', end_error);
3359 if (token.type != T_IDENTIFIER)
3361 (void)token.v.symbol;
3362 expect(')', end_error);
3363 } else if (symbol == sym_dllimport) {
3365 DET_MOD(dllimport, DM_DLLIMPORT);
3366 } else if (symbol == sym_dllexport) {
3368 DET_MOD(dllexport, DM_DLLEXPORT);
3369 } else if (symbol == sym_thread) {
3371 DET_MOD(thread, DM_THREAD);
3372 } else if (symbol == sym_naked) {
3374 DET_MOD(naked, DM_NAKED);
3375 } else if (symbol == sym_noinline) {
3377 DET_MOD(noinline, DM_NOINLINE);
3378 } else if (symbol == sym_returns_twice) {
3380 DET_MOD(returns_twice, DM_RETURNS_TWICE);
3381 } else if (symbol == sym_noreturn) {
3383 DET_MOD(noreturn, DM_NORETURN);
3384 } else if (symbol == sym_nothrow) {
3386 DET_MOD(nothrow, DM_NOTHROW);
3387 } else if (symbol == sym_novtable) {
3389 DET_MOD(novtable, DM_NOVTABLE);
3390 } else if (symbol == sym_property) {
3392 expect('(', end_error);
3394 bool is_get = false;
3395 if (token.type != T_IDENTIFIER)
3397 if (token.v.symbol == sym_get) {
3399 } else if (token.v.symbol == sym_put) {
3401 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3405 expect('=', end_error);
3406 if (token.type != T_IDENTIFIER)
3409 if (specifiers->get_property_sym != NULL) {
3410 errorf(HERE, "get property name already specified");
3412 specifiers->get_property_sym = token.v.symbol;
3415 if (specifiers->put_property_sym != NULL) {
3416 errorf(HERE, "put property name already specified");
3418 specifiers->put_property_sym = token.v.symbol;
3422 if (token.type == ',') {
3428 expect(')', end_error);
3429 } else if (symbol == sym_selectany) {
3431 DET_MOD(selectany, DM_SELECTANY);
3432 } else if (symbol == sym_uuid) {
3434 expect('(', end_error);
3435 if (token.type != T_STRING_LITERAL)
3438 expect(')', end_error);
3439 } else if (symbol == sym_deprecated) {
3441 if (specifiers->deprecated != 0 && warning.other)
3442 warningf(HERE, "deprecated used more than once");
3443 specifiers->deprecated = true;
3444 if (token.type == '(') {
3446 if (token.type == T_STRING_LITERAL) {
3447 specifiers->deprecated_string = token.v.string.begin;
3450 errorf(HERE, "string literal expected");
3452 expect(')', end_error);
3454 } else if (symbol == sym_noalias) {
3456 DET_MOD(noalias, DM_NOALIAS);
3459 warningf(HERE, "Unknown modifier '%Y' ignored", token.v.symbol);
3461 if (token.type == '(')
3465 if (token.type == ',')
3472 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
3474 entity_t *entity = allocate_entity_zero(kind);
3475 entity->base.source_position = *HERE;
3476 entity->base.symbol = symbol;
3477 if (is_declaration(entity)) {
3478 entity->declaration.type = type_error_type;
3479 entity->declaration.implicit = true;
3480 } else if (kind == ENTITY_TYPEDEF) {
3481 entity->typedefe.type = type_error_type;
3482 entity->typedefe.builtin = true;
3484 record_entity(entity, false);
3488 static void parse_microsoft_based(based_spec_t *based_spec)
3490 if (token.type != T_IDENTIFIER) {
3491 parse_error_expected("while parsing __based", T_IDENTIFIER, NULL);
3494 symbol_t *symbol = token.v.symbol;
3495 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3497 if (entity == NULL || entity->base.kind != ENTITY_VARIABLE) {
3498 errorf(HERE, "'%Y' is not a variable name.", symbol);
3499 entity = create_error_entity(symbol, ENTITY_VARIABLE);
3501 variable_t *variable = &entity->variable;
3503 if (based_spec->base_variable != NULL) {
3504 errorf(HERE, "__based type qualifier specified more than once");
3506 based_spec->source_position = token.source_position;
3507 based_spec->base_variable = variable;
3509 type_t *const type = variable->base.type;
3511 if (is_type_valid(type)) {
3512 if (! is_type_pointer(skip_typeref(type))) {
3513 errorf(HERE, "variable in __based modifier must have pointer type instead of '%T'", type);
3515 if (variable->base.base.parent_scope != file_scope) {
3516 errorf(HERE, "a nonstatic local variable may not be used in a __based specification");
3524 * Finish the construction of a struct type by calculating
3525 * its size, offsets, alignment.
3527 static void finish_struct_type(compound_type_t *type)
3529 assert(type->compound != NULL);
3531 compound_t *compound = type->compound;
3532 if (!compound->complete)
3537 il_alignment_t alignment = 1;
3538 bool need_pad = false;
3540 entity_t *entry = compound->members.entities;
3541 for (; entry != NULL; entry = entry->base.next) {
3542 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3545 type_t *m_type = skip_typeref(entry->declaration.type);
3546 if (! is_type_valid(m_type)) {
3547 /* simply ignore errors here */
3550 il_alignment_t m_alignment = m_type->base.alignment;
3551 if (m_alignment > alignment)
3552 alignment = m_alignment;
3554 offset = (size + m_alignment - 1) & -m_alignment;
3558 entry->compound_member.offset = offset;
3559 size = offset + m_type->base.size;
3561 if (type->base.alignment != 0) {
3562 alignment = type->base.alignment;
3565 offset = (size + alignment - 1) & -alignment;
3570 if (warning.padded) {
3571 warningf(&compound->base.source_position, "'%T' needs padding", type);
3574 if (compound->modifiers & DM_PACKED && warning.packed) {
3575 warningf(&compound->base.source_position,
3576 "superfluous packed attribute on '%T'", type);
3580 type->base.size = offset;
3581 type->base.alignment = alignment;
3585 * Finish the construction of an union type by calculating
3586 * its size and alignment.
3588 static void finish_union_type(compound_type_t *type)
3590 assert(type->compound != NULL);
3592 compound_t *compound = type->compound;
3593 if (! compound->complete)
3597 il_alignment_t alignment = 1;
3599 entity_t *entry = compound->members.entities;
3600 for (; entry != NULL; entry = entry->base.next) {
3601 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3604 type_t *m_type = skip_typeref(entry->declaration.type);
3605 if (! is_type_valid(m_type))
3608 entry->compound_member.offset = 0;
3609 if (m_type->base.size > size)
3610 size = m_type->base.size;
3611 if (m_type->base.alignment > alignment)
3612 alignment = m_type->base.alignment;
3614 if (type->base.alignment != 0) {
3615 alignment = type->base.alignment;
3617 size = (size + alignment - 1) & -alignment;
3618 type->base.size = size;
3619 type->base.alignment = alignment;
3622 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3624 type_t *type = NULL;
3625 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3626 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3627 unsigned type_specifiers = 0;
3628 bool newtype = false;
3629 bool saw_error = false;
3630 bool old_gcc_extension = in_gcc_extension;
3632 specifiers->source_position = token.source_position;
3635 specifiers->modifiers
3636 |= parse_attributes(&specifiers->gnu_attributes);
3637 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3638 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3640 switch (token.type) {
3642 #define MATCH_STORAGE_CLASS(token, class) \
3644 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3645 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3647 specifiers->storage_class = class; \
3648 if (specifiers->thread_local) \
3649 goto check_thread_storage_class; \
3653 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3654 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3655 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3656 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3657 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3661 expect('(', end_error);
3662 add_anchor_token(')');
3663 parse_microsoft_extended_decl_modifier(specifiers);
3664 rem_anchor_token(')');
3665 expect(')', end_error);
3669 if (specifiers->thread_local) {
3670 errorf(HERE, "duplicate '__thread'");
3672 specifiers->thread_local = true;
3673 check_thread_storage_class:
3674 switch (specifiers->storage_class) {
3675 case STORAGE_CLASS_EXTERN:
3676 case STORAGE_CLASS_NONE:
3677 case STORAGE_CLASS_STATIC:
3681 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3682 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3683 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3684 wrong_thread_stoarge_class:
3685 errorf(HERE, "'__thread' used with '%s'", wrong);
3692 /* type qualifiers */
3693 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3695 qualifiers |= qualifier; \
3699 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3700 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3701 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3702 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3703 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3704 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3705 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3706 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3708 case T___extension__:
3710 in_gcc_extension = true;
3713 /* type specifiers */
3714 #define MATCH_SPECIFIER(token, specifier, name) \
3716 if (type_specifiers & specifier) { \
3717 errorf(HERE, "multiple " name " type specifiers given"); \
3719 type_specifiers |= specifier; \
3724 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3725 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3726 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3727 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3728 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3729 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3730 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3731 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3732 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3733 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3734 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3735 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3736 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3737 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3738 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3739 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3740 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3741 MATCH_SPECIFIER(T_wchar_t, SPECIFIER_WCHAR_T, "wchar_t");
3743 case T__forceinline:
3744 /* only in microsoft mode */
3745 specifiers->modifiers |= DM_FORCEINLINE;
3750 specifiers->is_inline = true;
3754 if (type_specifiers & SPECIFIER_LONG_LONG) {
3755 errorf(HERE, "multiple type specifiers given");
3756 } else if (type_specifiers & SPECIFIER_LONG) {
3757 type_specifiers |= SPECIFIER_LONG_LONG;
3759 type_specifiers |= SPECIFIER_LONG;
3765 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3767 type->compound.compound = parse_compound_type_specifier(true);
3768 finish_struct_type(&type->compound);
3772 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3773 type->compound.compound = parse_compound_type_specifier(false);
3774 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3775 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3776 finish_union_type(&type->compound);
3780 type = parse_enum_specifier();
3783 type = parse_typeof();
3785 case T___builtin_va_list:
3786 type = duplicate_type(type_valist);
3790 case T_IDENTIFIER: {
3791 /* only parse identifier if we haven't found a type yet */
3792 if (type != NULL || type_specifiers != 0) {
3793 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3794 * declaration, so it doesn't generate errors about expecting '(' or
3796 switch (look_ahead(1)->type) {
3803 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3807 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3812 goto finish_specifiers;
3816 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3817 if (typedef_type == NULL) {
3818 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3819 * declaration, so it doesn't generate 'implicit int' followed by more
3820 * errors later on. */
3821 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3827 errorf(HERE, "%K does not name a type", &token);
3830 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3832 type = allocate_type_zero(TYPE_TYPEDEF);
3833 type->typedeft.typedefe = &entity->typedefe;
3837 if (la1_type == '&' || la1_type == '*')
3838 goto finish_specifiers;
3843 goto finish_specifiers;
3848 type = typedef_type;
3852 /* function specifier */
3854 goto finish_specifiers;
3859 in_gcc_extension = old_gcc_extension;
3861 if (type == NULL || (saw_error && type_specifiers != 0)) {
3862 atomic_type_kind_t atomic_type;
3864 /* match valid basic types */
3865 switch (type_specifiers) {
3866 case SPECIFIER_VOID:
3867 atomic_type = ATOMIC_TYPE_VOID;
3869 case SPECIFIER_WCHAR_T:
3870 atomic_type = ATOMIC_TYPE_WCHAR_T;
3872 case SPECIFIER_CHAR:
3873 atomic_type = ATOMIC_TYPE_CHAR;
3875 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3876 atomic_type = ATOMIC_TYPE_SCHAR;
3878 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3879 atomic_type = ATOMIC_TYPE_UCHAR;
3881 case SPECIFIER_SHORT:
3882 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3883 case SPECIFIER_SHORT | SPECIFIER_INT:
3884 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3885 atomic_type = ATOMIC_TYPE_SHORT;
3887 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3888 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3889 atomic_type = ATOMIC_TYPE_USHORT;
3892 case SPECIFIER_SIGNED:
3893 case SPECIFIER_SIGNED | SPECIFIER_INT:
3894 atomic_type = ATOMIC_TYPE_INT;
3896 case SPECIFIER_UNSIGNED:
3897 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3898 atomic_type = ATOMIC_TYPE_UINT;
3900 case SPECIFIER_LONG:
3901 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3902 case SPECIFIER_LONG | SPECIFIER_INT:
3903 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3904 atomic_type = ATOMIC_TYPE_LONG;
3906 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3907 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3908 atomic_type = ATOMIC_TYPE_ULONG;
3911 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3912 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3913 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3914 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3916 atomic_type = ATOMIC_TYPE_LONGLONG;
3917 goto warn_about_long_long;
3919 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3920 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3922 atomic_type = ATOMIC_TYPE_ULONGLONG;
3923 warn_about_long_long:
3924 if (warning.long_long) {
3925 warningf(&specifiers->source_position,
3926 "ISO C90 does not support 'long long'");
3930 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3931 atomic_type = unsigned_int8_type_kind;
3934 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3935 atomic_type = unsigned_int16_type_kind;
3938 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3939 atomic_type = unsigned_int32_type_kind;
3942 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3943 atomic_type = unsigned_int64_type_kind;
3946 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3947 atomic_type = unsigned_int128_type_kind;
3950 case SPECIFIER_INT8:
3951 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3952 atomic_type = int8_type_kind;
3955 case SPECIFIER_INT16:
3956 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3957 atomic_type = int16_type_kind;
3960 case SPECIFIER_INT32:
3961 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3962 atomic_type = int32_type_kind;
3965 case SPECIFIER_INT64:
3966 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3967 atomic_type = int64_type_kind;
3970 case SPECIFIER_INT128:
3971 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3972 atomic_type = int128_type_kind;
3975 case SPECIFIER_FLOAT:
3976 atomic_type = ATOMIC_TYPE_FLOAT;
3978 case SPECIFIER_DOUBLE:
3979 atomic_type = ATOMIC_TYPE_DOUBLE;
3981 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3982 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3984 case SPECIFIER_BOOL:
3985 atomic_type = ATOMIC_TYPE_BOOL;
3987 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3988 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3989 atomic_type = ATOMIC_TYPE_FLOAT;
3991 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3992 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3993 atomic_type = ATOMIC_TYPE_DOUBLE;
3995 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3996 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3997 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
4000 /* invalid specifier combination, give an error message */
4001 if (type_specifiers == 0) {
4005 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
4006 if (!(c_mode & _CXX) && !strict_mode) {
4007 if (warning.implicit_int) {
4008 warningf(HERE, "no type specifiers in declaration, using 'int'");
4010 atomic_type = ATOMIC_TYPE_INT;
4013 errorf(HERE, "no type specifiers given in declaration");
4015 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
4016 (type_specifiers & SPECIFIER_UNSIGNED)) {
4017 errorf(HERE, "signed and unsigned specifiers given");
4018 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
4019 errorf(HERE, "only integer types can be signed or unsigned");
4021 errorf(HERE, "multiple datatypes in declaration");
4026 if (type_specifiers & SPECIFIER_COMPLEX) {
4027 type = allocate_type_zero(TYPE_COMPLEX);
4028 type->complex.akind = atomic_type;
4029 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
4030 type = allocate_type_zero(TYPE_IMAGINARY);
4031 type->imaginary.akind = atomic_type;
4033 type = allocate_type_zero(TYPE_ATOMIC);
4034 type->atomic.akind = atomic_type;
4037 } else if (type_specifiers != 0) {
4038 errorf(HERE, "multiple datatypes in declaration");
4041 /* FIXME: check type qualifiers here */
4043 type->base.qualifiers = qualifiers;
4044 type->base.modifiers = modifiers;
4046 type_t *result = typehash_insert(type);
4047 if (newtype && result != type) {
4051 specifiers->type = result;
4055 specifiers->type = type_error_type;
4059 static type_qualifiers_t parse_type_qualifiers(void)
4061 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
4064 switch (token.type) {
4065 /* type qualifiers */
4066 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
4067 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
4068 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
4069 /* microsoft extended type modifiers */
4070 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4071 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4072 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4073 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4074 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4083 * Parses an K&R identifier list
4085 static void parse_identifier_list(scope_t *scope)
4088 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
4089 entity->base.source_position = token.source_position;
4090 entity->base.namespc = NAMESPACE_NORMAL;
4091 entity->base.symbol = token.v.symbol;
4092 /* a K&R parameter has no type, yet */
4096 append_entity(scope, entity);
4098 if (token.type != ',') {
4102 } while (token.type == T_IDENTIFIER);
4105 static entity_t *parse_parameter(void)
4107 declaration_specifiers_t specifiers;
4108 memset(&specifiers, 0, sizeof(specifiers));
4110 parse_declaration_specifiers(&specifiers);
4112 entity_t *entity = parse_declarator(&specifiers,
4113 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4114 anonymous_entity = NULL;
4118 static void semantic_parameter_incomplete(const entity_t *entity)
4120 assert(entity->kind == ENTITY_PARAMETER);
4122 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
4123 * list in a function declarator that is part of a
4124 * definition of that function shall not have
4125 * incomplete type. */
4126 type_t *type = skip_typeref(entity->declaration.type);
4127 if (is_type_incomplete(type)) {
4128 errorf(&entity->base.source_position,
4129 "parameter '%Y' has incomplete type '%T'", entity->base.symbol,
4130 entity->declaration.type);
4135 * Parses function type parameters (and optionally creates variable_t entities
4136 * for them in a scope)
4138 static void parse_parameters(function_type_t *type, scope_t *scope)
4141 add_anchor_token(')');
4142 int saved_comma_state = save_and_reset_anchor_state(',');
4144 if (token.type == T_IDENTIFIER &&
4145 !is_typedef_symbol(token.v.symbol)) {
4146 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4147 if (la1_type == ',' || la1_type == ')') {
4148 type->kr_style_parameters = true;
4149 type->unspecified_parameters = true;
4150 parse_identifier_list(scope);
4151 goto parameters_finished;
4155 if (token.type == ')') {
4156 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4157 if (!(c_mode & _CXX))
4158 type->unspecified_parameters = true;
4159 goto parameters_finished;
4162 function_parameter_t *parameter;
4163 function_parameter_t *last_parameter = NULL;
4166 switch (token.type) {
4169 type->variadic = true;
4170 goto parameters_finished;
4173 case T___extension__:
4176 entity_t *entity = parse_parameter();
4177 if (entity->kind == ENTITY_TYPEDEF) {
4178 errorf(&entity->base.source_position,
4179 "typedef not allowed as function parameter");
4182 assert(is_declaration(entity));
4184 /* func(void) is not a parameter */
4185 if (last_parameter == NULL
4186 && token.type == ')'
4187 && entity->base.symbol == NULL
4188 && skip_typeref(entity->declaration.type) == type_void) {
4189 goto parameters_finished;
4191 semantic_parameter_incomplete(entity);
4193 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4194 memset(parameter, 0, sizeof(parameter[0]));
4195 parameter->type = entity->declaration.type;
4197 if (scope != NULL) {
4198 append_entity(scope, entity);
4201 if (last_parameter != NULL) {
4202 last_parameter->next = parameter;
4204 type->parameters = parameter;
4206 last_parameter = parameter;
4211 goto parameters_finished;
4213 if (token.type != ',') {
4214 goto parameters_finished;
4220 parameters_finished:
4221 rem_anchor_token(')');
4222 expect(')', end_error);
4225 restore_anchor_state(',', saved_comma_state);
4228 typedef enum construct_type_kind_t {
4231 CONSTRUCT_REFERENCE,
4234 } construct_type_kind_t;
4236 typedef struct construct_type_t construct_type_t;
4237 struct construct_type_t {
4238 construct_type_kind_t kind;
4239 construct_type_t *next;
4242 typedef struct parsed_pointer_t parsed_pointer_t;
4243 struct parsed_pointer_t {
4244 construct_type_t construct_type;
4245 type_qualifiers_t type_qualifiers;
4246 variable_t *base_variable; /**< MS __based extension. */
4249 typedef struct parsed_reference_t parsed_reference_t;
4250 struct parsed_reference_t {
4251 construct_type_t construct_type;
4254 typedef struct construct_function_type_t construct_function_type_t;
4255 struct construct_function_type_t {
4256 construct_type_t construct_type;
4257 type_t *function_type;
4260 typedef struct parsed_array_t parsed_array_t;
4261 struct parsed_array_t {
4262 construct_type_t construct_type;
4263 type_qualifiers_t type_qualifiers;
4269 typedef struct construct_base_type_t construct_base_type_t;
4270 struct construct_base_type_t {
4271 construct_type_t construct_type;
4275 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4279 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4280 memset(pointer, 0, sizeof(pointer[0]));
4281 pointer->construct_type.kind = CONSTRUCT_POINTER;
4282 pointer->type_qualifiers = parse_type_qualifiers();
4283 pointer->base_variable = base_variable;
4285 return &pointer->construct_type;
4288 static construct_type_t *parse_reference_declarator(void)
4292 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4293 memset(reference, 0, sizeof(reference[0]));
4294 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4296 return (construct_type_t*)reference;
4299 static construct_type_t *parse_array_declarator(void)
4302 add_anchor_token(']');
4304 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4305 memset(array, 0, sizeof(array[0]));
4306 array->construct_type.kind = CONSTRUCT_ARRAY;
4308 if (token.type == T_static) {
4309 array->is_static = true;
4313 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4314 if (type_qualifiers != 0) {
4315 if (token.type == T_static) {
4316 array->is_static = true;
4320 array->type_qualifiers = type_qualifiers;
4322 if (token.type == '*' && look_ahead(1)->type == ']') {
4323 array->is_variable = true;
4325 } else if (token.type != ']') {
4326 array->size = parse_assignment_expression();
4329 rem_anchor_token(']');
4330 expect(']', end_error);
4333 return &array->construct_type;
4336 static construct_type_t *parse_function_declarator(scope_t *scope,
4337 decl_modifiers_t modifiers)
4339 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4340 function_type_t *ftype = &type->function;
4342 ftype->linkage = current_linkage;
4344 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4345 case DM_NONE: break;
4346 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4347 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4348 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4349 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4352 errorf(HERE, "multiple calling conventions in declaration");
4356 parse_parameters(ftype, scope);
4358 construct_function_type_t *construct_function_type =
4359 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4360 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4361 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4362 construct_function_type->function_type = type;
4364 return &construct_function_type->construct_type;
4367 typedef struct parse_declarator_env_t {
4368 decl_modifiers_t modifiers;
4370 source_position_t source_position;
4372 } parse_declarator_env_t;
4374 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4375 bool may_be_abstract)
4377 /* construct a single linked list of construct_type_t's which describe
4378 * how to construct the final declarator type */
4379 construct_type_t *first = NULL;
4380 construct_type_t *last = NULL;
4381 gnu_attribute_t *attributes = NULL;
4383 decl_modifiers_t modifiers = parse_attributes(&attributes);
4385 /* MS __based extension */
4386 based_spec_t base_spec;
4387 base_spec.base_variable = NULL;
4390 construct_type_t *type;
4391 switch (token.type) {
4393 if (!(c_mode & _CXX))
4394 errorf(HERE, "references are only available for C++");
4395 if (base_spec.base_variable != NULL && warning.other) {
4396 warningf(&base_spec.source_position,
4397 "__based does not precede a pointer operator, ignored");
4399 type = parse_reference_declarator();
4401 base_spec.base_variable = NULL;
4405 type = parse_pointer_declarator(base_spec.base_variable);
4407 base_spec.base_variable = NULL;
4412 expect('(', end_error);
4413 add_anchor_token(')');
4414 parse_microsoft_based(&base_spec);
4415 rem_anchor_token(')');
4416 expect(')', end_error);
4420 goto ptr_operator_end;
4431 /* TODO: find out if this is correct */
4432 modifiers |= parse_attributes(&attributes);
4435 if (base_spec.base_variable != NULL && warning.other) {
4436 warningf(&base_spec.source_position,
4437 "__based does not precede a pointer operator, ignored");
4441 modifiers |= env->modifiers;
4442 env->modifiers = modifiers;
4445 construct_type_t *inner_types = NULL;
4447 switch (token.type) {
4450 errorf(HERE, "no identifier expected in typename");
4452 env->symbol = token.v.symbol;
4453 env->source_position = token.source_position;
4458 /* §6.7.6:2 footnote 126: Empty parentheses in a type name are
4459 * interpreted as ``function with no parameter specification'', rather
4460 * than redundant parentheses around the omitted identifier. */
4461 if (look_ahead(1)->type != ')') {
4463 add_anchor_token(')');
4464 inner_types = parse_inner_declarator(env, may_be_abstract);
4465 if (inner_types != NULL) {
4466 /* All later declarators only modify the return type */
4469 rem_anchor_token(')');
4470 expect(')', end_error);
4474 if (may_be_abstract)
4476 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4481 construct_type_t *p = last;
4484 construct_type_t *type;
4485 switch (token.type) {
4487 scope_t *scope = NULL;
4489 scope = &env->parameters;
4491 type = parse_function_declarator(scope, modifiers);
4495 type = parse_array_declarator();
4498 goto declarator_finished;
4501 /* insert in the middle of the list (behind p) */
4503 type->next = p->next;
4514 declarator_finished:
4515 /* append inner_types at the end of the list, we don't to set last anymore
4516 * as it's not needed anymore */
4518 assert(first == NULL);
4519 first = inner_types;
4521 last->next = inner_types;
4529 static void parse_declaration_attributes(entity_t *entity)
4531 gnu_attribute_t *attributes = NULL;
4532 decl_modifiers_t modifiers = parse_attributes(&attributes);
4538 if (entity->kind == ENTITY_TYPEDEF) {
4539 modifiers |= entity->typedefe.modifiers;
4540 type = entity->typedefe.type;
4542 assert(is_declaration(entity));
4543 modifiers |= entity->declaration.modifiers;
4544 type = entity->declaration.type;
4549 /* handle these strange/stupid mode attributes */
4550 gnu_attribute_t *attribute = attributes;
4551 for ( ; attribute != NULL; attribute = attribute->next) {
4552 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4555 atomic_type_kind_t akind = attribute->u.akind;
4556 if (!is_type_signed(type)) {
4558 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4559 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4560 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4561 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4563 panic("invalid akind in mode attribute");
4567 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break;
4568 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break;
4569 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break;
4570 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break;
4572 panic("invalid akind in mode attribute");
4576 type = make_atomic_type(akind, type->base.qualifiers);
4579 type_modifiers_t type_modifiers = type->base.modifiers;
4580 if (modifiers & DM_TRANSPARENT_UNION)
4581 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4583 if (type->base.modifiers != type_modifiers) {
4584 type_t *copy = duplicate_type(type);
4585 copy->base.modifiers = type_modifiers;
4587 type = typehash_insert(copy);
4589 obstack_free(type_obst, copy);
4593 if (entity->kind == ENTITY_TYPEDEF) {
4594 entity->typedefe.type = type;
4595 entity->typedefe.modifiers = modifiers;
4597 entity->declaration.type = type;
4598 entity->declaration.modifiers = modifiers;
4602 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4604 construct_type_t *iter = construct_list;
4605 for (; iter != NULL; iter = iter->next) {
4606 switch (iter->kind) {
4607 case CONSTRUCT_INVALID:
4608 internal_errorf(HERE, "invalid type construction found");
4609 case CONSTRUCT_FUNCTION: {
4610 construct_function_type_t *construct_function_type
4611 = (construct_function_type_t*) iter;
4613 type_t *function_type = construct_function_type->function_type;
4615 function_type->function.return_type = type;
4617 type_t *skipped_return_type = skip_typeref(type);
4619 if (is_type_function(skipped_return_type)) {
4620 errorf(HERE, "function returning function is not allowed");
4621 } else if (is_type_array(skipped_return_type)) {
4622 errorf(HERE, "function returning array is not allowed");
4624 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4626 "type qualifiers in return type of function type are meaningless");
4630 type = function_type;
4634 case CONSTRUCT_POINTER: {
4635 if (is_type_reference(skip_typeref(type)))
4636 errorf(HERE, "cannot declare a pointer to reference");
4638 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4639 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4643 case CONSTRUCT_REFERENCE:
4644 if (is_type_reference(skip_typeref(type)))
4645 errorf(HERE, "cannot declare a reference to reference");
4647 type = make_reference_type(type);
4650 case CONSTRUCT_ARRAY: {
4651 if (is_type_reference(skip_typeref(type)))
4652 errorf(HERE, "cannot declare an array of references");
4654 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4655 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4657 expression_t *size_expression = parsed_array->size;
4658 if (size_expression != NULL) {
4660 = create_implicit_cast(size_expression, type_size_t);
4663 array_type->base.qualifiers = parsed_array->type_qualifiers;
4664 array_type->array.element_type = type;
4665 array_type->array.is_static = parsed_array->is_static;
4666 array_type->array.is_variable = parsed_array->is_variable;
4667 array_type->array.size_expression = size_expression;
4669 if (size_expression != NULL) {
4670 if (is_constant_expression(size_expression)) {
4671 array_type->array.size_constant = true;
4672 array_type->array.size
4673 = fold_constant(size_expression);
4675 array_type->array.is_vla = true;
4679 type_t *skipped_type = skip_typeref(type);
4681 if (is_type_incomplete(skipped_type)) {
4682 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4683 } else if (is_type_function(skipped_type)) {
4684 errorf(HERE, "array of functions is not allowed");
4691 type_t *hashed_type = typehash_insert(type);
4692 if (hashed_type != type) {
4693 /* the function type was constructed earlier freeing it here will
4694 * destroy other types... */
4695 if (iter->kind != CONSTRUCT_FUNCTION) {
4705 static type_t *automatic_type_conversion(type_t *orig_type);
4707 static type_t *semantic_parameter(const source_position_t *pos,
4709 const declaration_specifiers_t *specifiers,
4712 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4713 * shall be adjusted to ``qualified pointer to type'',
4715 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4716 * type'' shall be adjusted to ``pointer to function
4717 * returning type'', as in 6.3.2.1. */
4718 type = automatic_type_conversion(type);
4720 if (specifiers->is_inline && is_type_valid(type)) {
4721 errorf(pos, "parameter '%Y' declared 'inline'", symbol);
4724 /* §6.9.1:6 The declarations in the declaration list shall contain
4725 * no storage-class specifier other than register and no
4726 * initializations. */
4727 if (specifiers->thread_local || (
4728 specifiers->storage_class != STORAGE_CLASS_NONE &&
4729 specifiers->storage_class != STORAGE_CLASS_REGISTER)
4731 errorf(pos, "invalid storage class for parameter '%Y'", symbol);
4734 /* delay test for incomplete type, because we might have (void)
4735 * which is legal but incomplete... */
4740 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4741 declarator_flags_t flags)
4743 parse_declarator_env_t env;
4744 memset(&env, 0, sizeof(env));
4745 env.modifiers = specifiers->modifiers;
4747 construct_type_t *construct_type =
4748 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4750 construct_declarator_type(construct_type, specifiers->type);
4751 type_t *type = skip_typeref(orig_type);
4753 if (construct_type != NULL) {
4754 obstack_free(&temp_obst, construct_type);
4758 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4759 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4760 entity->base.symbol = env.symbol;
4761 entity->base.source_position = env.source_position;
4762 entity->typedefe.type = orig_type;
4764 if (anonymous_entity != NULL) {
4765 if (is_type_compound(type)) {
4766 assert(anonymous_entity->compound.alias == NULL);
4767 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4768 anonymous_entity->kind == ENTITY_UNION);
4769 anonymous_entity->compound.alias = entity;
4770 anonymous_entity = NULL;
4771 } else if (is_type_enum(type)) {
4772 assert(anonymous_entity->enume.alias == NULL);
4773 assert(anonymous_entity->kind == ENTITY_ENUM);
4774 anonymous_entity->enume.alias = entity;
4775 anonymous_entity = NULL;
4779 /* create a declaration type entity */
4780 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4781 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4783 if (specifiers->is_inline && is_type_valid(type)) {
4784 errorf(&env.source_position,
4785 "compound member '%Y' declared 'inline'", env.symbol);
4788 if (specifiers->thread_local ||
4789 specifiers->storage_class != STORAGE_CLASS_NONE) {
4790 errorf(&env.source_position,
4791 "compound member '%Y' must have no storage class",
4794 } else if (flags & DECL_IS_PARAMETER) {
4795 orig_type = semantic_parameter(&env.source_position, orig_type,
4796 specifiers, env.symbol);
4798 entity = allocate_entity_zero(ENTITY_PARAMETER);
4799 } else if (is_type_function(type)) {
4800 entity = allocate_entity_zero(ENTITY_FUNCTION);
4802 entity->function.is_inline = specifiers->is_inline;
4803 entity->function.parameters = env.parameters;
4805 if (specifiers->thread_local || (
4806 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4807 specifiers->storage_class != STORAGE_CLASS_NONE &&
4808 specifiers->storage_class != STORAGE_CLASS_STATIC)
4810 errorf(&env.source_position,
4811 "invalid storage class for function '%Y'", env.symbol);
4814 entity = allocate_entity_zero(ENTITY_VARIABLE);
4816 entity->variable.get_property_sym = specifiers->get_property_sym;
4817 entity->variable.put_property_sym = specifiers->put_property_sym;
4818 if (specifiers->alignment != 0) {
4819 /* TODO: add checks here */
4820 entity->variable.alignment = specifiers->alignment;
4823 if (specifiers->is_inline && is_type_valid(type)) {
4824 errorf(&env.source_position,
4825 "variable '%Y' declared 'inline'", env.symbol);
4828 entity->variable.thread_local = specifiers->thread_local;
4830 bool invalid_storage_class = false;
4831 if (current_scope == file_scope) {
4832 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4833 specifiers->storage_class != STORAGE_CLASS_NONE &&
4834 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4835 invalid_storage_class = true;
4838 if (specifiers->thread_local &&
4839 specifiers->storage_class == STORAGE_CLASS_NONE) {
4840 invalid_storage_class = true;
4843 if (invalid_storage_class) {
4844 errorf(&env.source_position,
4845 "invalid storage class for variable '%Y'", env.symbol);
4849 entity->base.source_position = env.source_position;
4850 entity->base.symbol = env.symbol;
4851 entity->base.namespc = NAMESPACE_NORMAL;
4852 entity->declaration.type = orig_type;
4853 entity->declaration.modifiers = env.modifiers;
4854 entity->declaration.deprecated_string = specifiers->deprecated_string;
4856 storage_class_t storage_class = specifiers->storage_class;
4857 entity->declaration.declared_storage_class = storage_class;
4859 if (storage_class == STORAGE_CLASS_NONE && current_scope != file_scope)
4860 storage_class = STORAGE_CLASS_AUTO;
4861 entity->declaration.storage_class = storage_class;
4864 parse_declaration_attributes(entity);
4869 static type_t *parse_abstract_declarator(type_t *base_type)
4871 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4873 type_t *result = construct_declarator_type(construct_type, base_type);
4874 if (construct_type != NULL) {
4875 obstack_free(&temp_obst, construct_type);
4882 * Check if the declaration of main is suspicious. main should be a
4883 * function with external linkage, returning int, taking either zero
4884 * arguments, two, or three arguments of appropriate types, ie.
4886 * int main([ int argc, char **argv [, char **env ] ]).
4888 * @param decl the declaration to check
4889 * @param type the function type of the declaration
4891 static void check_type_of_main(const entity_t *entity)
4893 const source_position_t *pos = &entity->base.source_position;
4894 if (entity->kind != ENTITY_FUNCTION) {
4895 warningf(pos, "'main' is not a function");
4899 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4900 warningf(pos, "'main' is normally a non-static function");
4903 type_t *type = skip_typeref(entity->declaration.type);
4904 assert(is_type_function(type));
4906 function_type_t *func_type = &type->function;
4907 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4908 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4909 func_type->return_type);
4911 const function_parameter_t *parm = func_type->parameters;
4913 type_t *const first_type = parm->type;
4914 if (!types_compatible(skip_typeref(first_type), type_int)) {
4916 "first argument of 'main' should be 'int', but is '%T'",
4921 type_t *const second_type = parm->type;
4922 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4923 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4927 type_t *const third_type = parm->type;
4928 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4929 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4933 goto warn_arg_count;
4937 warningf(pos, "'main' takes only zero, two or three arguments");
4943 * Check if a symbol is the equal to "main".
4945 static bool is_sym_main(const symbol_t *const sym)
4947 return strcmp(sym->string, "main") == 0;
4950 static void error_redefined_as_different_kind(const source_position_t *pos,
4951 const entity_t *old, entity_kind_t new_kind)
4953 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4954 get_entity_kind_name(old->kind), old->base.symbol,
4955 get_entity_kind_name(new_kind), &old->base.source_position);
4959 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4960 * for various problems that occur for multiple definitions
4962 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4964 const symbol_t *const symbol = entity->base.symbol;
4965 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4966 const source_position_t *pos = &entity->base.source_position;
4968 /* can happen in error cases */
4972 entity_t *previous_entity = get_entity(symbol, namespc);
4973 /* pushing the same entity twice will break the stack structure */
4974 assert(previous_entity != entity);
4976 if (entity->kind == ENTITY_FUNCTION) {
4977 type_t *const orig_type = entity->declaration.type;
4978 type_t *const type = skip_typeref(orig_type);
4980 assert(is_type_function(type));
4981 if (type->function.unspecified_parameters &&
4982 warning.strict_prototypes &&
4983 previous_entity == NULL) {
4984 warningf(pos, "function declaration '%#T' is not a prototype",
4988 if (warning.main && current_scope == file_scope
4989 && is_sym_main(symbol)) {
4990 check_type_of_main(entity);
4994 if (is_declaration(entity) &&
4995 warning.nested_externs &&
4996 entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
4997 current_scope != file_scope) {
4998 warningf(pos, "nested extern declaration of '%#T'",
4999 entity->declaration.type, symbol);
5002 if (previous_entity != NULL &&
5003 previous_entity->base.parent_scope == ¤t_function->parameters &&
5004 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
5005 assert(previous_entity->kind == ENTITY_PARAMETER);
5007 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
5008 entity->declaration.type, symbol,
5009 previous_entity->declaration.type, symbol,
5010 &previous_entity->base.source_position);
5014 if (previous_entity != NULL &&
5015 previous_entity->base.parent_scope == current_scope) {
5016 if (previous_entity->kind != entity->kind) {
5017 error_redefined_as_different_kind(pos, previous_entity,
5021 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
5022 errorf(pos, "redeclaration of enum entry '%Y' (declared %P)",
5023 symbol, &previous_entity->base.source_position);
5026 if (previous_entity->kind == ENTITY_TYPEDEF) {
5027 /* TODO: C++ allows this for exactly the same type */
5028 errorf(pos, "redefinition of typedef '%Y' (declared %P)",
5029 symbol, &previous_entity->base.source_position);
5033 /* at this point we should have only VARIABLES or FUNCTIONS */
5034 assert(is_declaration(previous_entity) && is_declaration(entity));
5036 declaration_t *const prev_decl = &previous_entity->declaration;
5037 declaration_t *const decl = &entity->declaration;
5039 /* can happen for K&R style declarations */
5040 if (prev_decl->type == NULL &&
5041 previous_entity->kind == ENTITY_PARAMETER &&
5042 entity->kind == ENTITY_PARAMETER) {
5043 prev_decl->type = decl->type;
5044 prev_decl->storage_class = decl->storage_class;
5045 prev_decl->declared_storage_class = decl->declared_storage_class;
5046 prev_decl->modifiers = decl->modifiers;
5047 prev_decl->deprecated_string = decl->deprecated_string;
5048 return previous_entity;
5051 type_t *const orig_type = decl->type;
5052 assert(orig_type != NULL);
5053 type_t *const type = skip_typeref(orig_type);
5054 type_t * prev_type = skip_typeref(prev_decl->type);
5056 if (!types_compatible(type, prev_type)) {
5058 "declaration '%#T' is incompatible with '%#T' (declared %P)",
5059 orig_type, symbol, prev_decl->type, symbol,
5060 &previous_entity->base.source_position);
5062 unsigned old_storage_class = prev_decl->storage_class;
5063 if (warning.redundant_decls &&
5066 !(prev_decl->modifiers & DM_USED) &&
5067 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
5068 warningf(&previous_entity->base.source_position,
5069 "unnecessary static forward declaration for '%#T'",
5070 prev_decl->type, symbol);
5073 unsigned new_storage_class = decl->storage_class;
5074 if (is_type_incomplete(prev_type)) {
5075 prev_decl->type = type;
5079 /* pretend no storage class means extern for function
5080 * declarations (except if the previous declaration is neither
5081 * none nor extern) */
5082 if (entity->kind == ENTITY_FUNCTION) {
5083 if (prev_type->function.unspecified_parameters) {
5084 prev_decl->type = type;
5088 switch (old_storage_class) {
5089 case STORAGE_CLASS_NONE:
5090 old_storage_class = STORAGE_CLASS_EXTERN;
5093 case STORAGE_CLASS_EXTERN:
5094 if (is_definition) {
5095 if (warning.missing_prototypes &&
5096 prev_type->function.unspecified_parameters &&
5097 !is_sym_main(symbol)) {
5098 warningf(pos, "no previous prototype for '%#T'",
5101 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5102 new_storage_class = STORAGE_CLASS_EXTERN;
5111 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5112 new_storage_class == STORAGE_CLASS_EXTERN) {
5113 warn_redundant_declaration:
5114 if (!is_definition &&
5115 warning.redundant_decls &&
5116 is_type_valid(prev_type) &&
5117 strcmp(previous_entity->base.source_position.input_name,
5118 "<builtin>") != 0) {
5120 "redundant declaration for '%Y' (declared %P)",
5121 symbol, &previous_entity->base.source_position);
5123 } else if (current_function == NULL) {
5124 if (old_storage_class != STORAGE_CLASS_STATIC &&
5125 new_storage_class == STORAGE_CLASS_STATIC) {
5127 "static declaration of '%Y' follows non-static declaration (declared %P)",
5128 symbol, &previous_entity->base.source_position);
5129 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5130 prev_decl->storage_class = STORAGE_CLASS_NONE;
5131 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
5133 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5135 goto error_redeclaration;
5136 goto warn_redundant_declaration;
5138 } else if (is_type_valid(prev_type)) {
5139 if (old_storage_class == new_storage_class) {
5140 error_redeclaration:
5141 errorf(pos, "redeclaration of '%Y' (declared %P)",
5142 symbol, &previous_entity->base.source_position);
5145 "redeclaration of '%Y' with different linkage (declared %P)",
5146 symbol, &previous_entity->base.source_position);
5151 prev_decl->modifiers |= decl->modifiers;
5152 if (entity->kind == ENTITY_FUNCTION) {
5153 previous_entity->function.is_inline |= entity->function.is_inline;
5155 return previous_entity;
5158 if (entity->kind == ENTITY_FUNCTION) {
5159 if (is_definition &&
5160 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5161 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5162 warningf(pos, "no previous prototype for '%#T'",
5163 entity->declaration.type, symbol);
5164 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5165 warningf(pos, "no previous declaration for '%#T'",
5166 entity->declaration.type, symbol);
5169 } else if (warning.missing_declarations &&
5170 entity->kind == ENTITY_VARIABLE &&
5171 current_scope == file_scope) {
5172 declaration_t *declaration = &entity->declaration;
5173 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5174 warningf(pos, "no previous declaration for '%#T'",
5175 declaration->type, symbol);
5180 assert(entity->base.parent_scope == NULL);
5181 assert(current_scope != NULL);
5183 entity->base.parent_scope = current_scope;
5184 entity->base.namespc = NAMESPACE_NORMAL;
5185 environment_push(entity);
5186 append_entity(current_scope, entity);
5191 static void parser_error_multiple_definition(entity_t *entity,
5192 const source_position_t *source_position)
5194 errorf(source_position, "multiple definition of '%Y' (declared %P)",
5195 entity->base.symbol, &entity->base.source_position);
5198 static bool is_declaration_specifier(const token_t *token,
5199 bool only_specifiers_qualifiers)
5201 switch (token->type) {
5206 return is_typedef_symbol(token->v.symbol);
5208 case T___extension__:
5210 return !only_specifiers_qualifiers;
5217 static void parse_init_declarator_rest(entity_t *entity)
5219 assert(is_declaration(entity));
5220 declaration_t *const declaration = &entity->declaration;
5224 type_t *orig_type = declaration->type;
5225 type_t *type = skip_typeref(orig_type);
5227 if (entity->kind == ENTITY_VARIABLE
5228 && entity->variable.initializer != NULL) {
5229 parser_error_multiple_definition(entity, HERE);
5232 bool must_be_constant = false;
5233 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5234 entity->base.parent_scope == file_scope) {
5235 must_be_constant = true;
5238 if (is_type_function(type)) {
5239 errorf(&entity->base.source_position,
5240 "function '%#T' is initialized like a variable",
5241 orig_type, entity->base.symbol);
5242 orig_type = type_error_type;
5245 parse_initializer_env_t env;
5246 env.type = orig_type;
5247 env.must_be_constant = must_be_constant;
5248 env.entity = entity;
5249 current_init_decl = entity;
5251 initializer_t *initializer = parse_initializer(&env);
5252 current_init_decl = NULL;
5254 if (entity->kind == ENTITY_VARIABLE) {
5255 /* § 6.7.5 (22) array initializers for arrays with unknown size
5256 * determine the array type size */
5257 declaration->type = env.type;
5258 entity->variable.initializer = initializer;
5262 /* parse rest of a declaration without any declarator */
5263 static void parse_anonymous_declaration_rest(
5264 const declaration_specifiers_t *specifiers)
5267 anonymous_entity = NULL;
5269 if (warning.other) {
5270 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5271 specifiers->thread_local) {
5272 warningf(&specifiers->source_position,
5273 "useless storage class in empty declaration");
5276 type_t *type = specifiers->type;
5277 switch (type->kind) {
5278 case TYPE_COMPOUND_STRUCT:
5279 case TYPE_COMPOUND_UNION: {
5280 if (type->compound.compound->base.symbol == NULL) {
5281 warningf(&specifiers->source_position,
5282 "unnamed struct/union that defines no instances");
5291 warningf(&specifiers->source_position, "empty declaration");
5297 static void check_variable_type_complete(entity_t *ent)
5299 if (ent->kind != ENTITY_VARIABLE)
5302 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5303 * type for the object shall be complete [...] */
5304 declaration_t *decl = &ent->declaration;
5305 if (decl->storage_class != STORAGE_CLASS_NONE)
5308 type_t *const orig_type = decl->type;
5309 type_t *const type = skip_typeref(orig_type);
5310 if (!is_type_incomplete(type))
5313 /* GCC allows global arrays without size and assigns them a length of one,
5314 * if no different declaration follows */
5315 if (is_type_array(type) &&
5317 ent->base.parent_scope == file_scope) {
5318 ARR_APP1(declaration_t*, incomplete_arrays, decl);
5322 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5323 orig_type, ent->base.symbol);
5327 static void parse_declaration_rest(entity_t *ndeclaration,
5328 const declaration_specifiers_t *specifiers,
5329 parsed_declaration_func finished_declaration,
5330 declarator_flags_t flags)
5332 add_anchor_token(';');
5333 add_anchor_token(',');
5335 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5337 if (token.type == '=') {
5338 parse_init_declarator_rest(entity);
5339 } else if (entity->kind == ENTITY_VARIABLE) {
5340 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5341 * [...] where the extern specifier is explicitly used. */
5342 declaration_t *decl = &entity->declaration;
5343 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5344 type_t *type = decl->type;
5345 if (is_type_reference(skip_typeref(type))) {
5346 errorf(&entity->base.source_position,
5347 "reference '%#T' must be initialized",
5348 type, entity->base.symbol);
5353 check_variable_type_complete(entity);
5355 if (token.type != ',')
5359 add_anchor_token('=');
5360 ndeclaration = parse_declarator(specifiers, flags);
5361 rem_anchor_token('=');
5363 expect(';', end_error);
5366 anonymous_entity = NULL;
5367 rem_anchor_token(';');
5368 rem_anchor_token(',');
5371 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5373 symbol_t *symbol = entity->base.symbol;
5374 if (symbol == NULL) {
5375 errorf(HERE, "anonymous declaration not valid as function parameter");
5379 assert(entity->base.namespc == NAMESPACE_NORMAL);
5380 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5381 if (previous_entity == NULL
5382 || previous_entity->base.parent_scope != current_scope) {
5383 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5388 if (is_definition) {
5389 errorf(HERE, "parameter '%Y' is initialised", entity->base.symbol);
5392 return record_entity(entity, false);
5395 static void parse_declaration(parsed_declaration_func finished_declaration,
5396 declarator_flags_t flags)
5398 declaration_specifiers_t specifiers;
5399 memset(&specifiers, 0, sizeof(specifiers));
5401 add_anchor_token(';');
5402 parse_declaration_specifiers(&specifiers);
5403 rem_anchor_token(';');
5405 if (token.type == ';') {
5406 parse_anonymous_declaration_rest(&specifiers);
5408 entity_t *entity = parse_declarator(&specifiers, flags);
5409 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5413 static type_t *get_default_promoted_type(type_t *orig_type)
5415 type_t *result = orig_type;
5417 type_t *type = skip_typeref(orig_type);
5418 if (is_type_integer(type)) {
5419 result = promote_integer(type);
5420 } else if (type == type_float) {
5421 result = type_double;
5427 static void parse_kr_declaration_list(entity_t *entity)
5429 if (entity->kind != ENTITY_FUNCTION)
5432 type_t *type = skip_typeref(entity->declaration.type);
5433 assert(is_type_function(type));
5434 if (!type->function.kr_style_parameters)
5438 add_anchor_token('{');
5440 /* push function parameters */
5441 size_t const top = environment_top();
5442 scope_t *old_scope = scope_push(&entity->function.parameters);
5444 entity_t *parameter = entity->function.parameters.entities;
5445 for ( ; parameter != NULL; parameter = parameter->base.next) {
5446 assert(parameter->base.parent_scope == NULL);
5447 parameter->base.parent_scope = current_scope;
5448 environment_push(parameter);
5451 /* parse declaration list */
5453 switch (token.type) {
5455 case T___extension__:
5456 /* This covers symbols, which are no type, too, and results in
5457 * better error messages. The typical cases are misspelled type
5458 * names and missing includes. */
5460 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5468 /* pop function parameters */
5469 assert(current_scope == &entity->function.parameters);
5470 scope_pop(old_scope);
5471 environment_pop_to(top);
5473 /* update function type */
5474 type_t *new_type = duplicate_type(type);
5476 function_parameter_t *parameters = NULL;
5477 function_parameter_t *last_parameter = NULL;
5479 parameter = entity->function.parameters.entities;
5480 for (; parameter != NULL; parameter = parameter->base.next) {
5481 type_t *parameter_type = parameter->declaration.type;
5482 if (parameter_type == NULL) {
5484 errorf(HERE, "no type specified for function parameter '%Y'",
5485 parameter->base.symbol);
5487 if (warning.implicit_int) {
5488 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5489 parameter->base.symbol);
5491 parameter_type = type_int;
5492 parameter->declaration.type = parameter_type;
5496 semantic_parameter_incomplete(parameter);
5497 parameter_type = parameter->declaration.type;
5500 * we need the default promoted types for the function type
5502 parameter_type = get_default_promoted_type(parameter_type);
5504 function_parameter_t *function_parameter
5505 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5506 memset(function_parameter, 0, sizeof(function_parameter[0]));
5508 function_parameter->type = parameter_type;
5509 if (last_parameter != NULL) {
5510 last_parameter->next = function_parameter;
5512 parameters = function_parameter;
5514 last_parameter = function_parameter;
5517 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5519 new_type->function.parameters = parameters;
5520 new_type->function.unspecified_parameters = true;
5522 type = typehash_insert(new_type);
5523 if (type != new_type) {
5524 obstack_free(type_obst, new_type);
5527 entity->declaration.type = type;
5529 rem_anchor_token('{');
5532 static bool first_err = true;
5535 * When called with first_err set, prints the name of the current function,
5538 static void print_in_function(void)
5542 diagnosticf("%s: In function '%Y':\n",
5543 current_function->base.base.source_position.input_name,
5544 current_function->base.base.symbol);
5549 * Check if all labels are defined in the current function.
5550 * Check if all labels are used in the current function.
5552 static void check_labels(void)
5554 for (const goto_statement_t *goto_statement = goto_first;
5555 goto_statement != NULL;
5556 goto_statement = goto_statement->next) {
5557 /* skip computed gotos */
5558 if (goto_statement->expression != NULL)
5561 label_t *label = goto_statement->label;
5564 if (label->base.source_position.input_name == NULL) {
5565 print_in_function();
5566 errorf(&goto_statement->base.source_position,
5567 "label '%Y' used but not defined", label->base.symbol);
5571 if (warning.unused_label) {
5572 for (const label_statement_t *label_statement = label_first;
5573 label_statement != NULL;
5574 label_statement = label_statement->next) {
5575 label_t *label = label_statement->label;
5577 if (! label->used) {
5578 print_in_function();
5579 warningf(&label_statement->base.source_position,
5580 "label '%Y' defined but not used", label->base.symbol);
5586 static void warn_unused_entity(entity_t *entity, entity_t *end)
5588 for (; entity != NULL; entity = entity->base.next) {
5589 if (!is_declaration(entity))
5592 declaration_t *declaration = &entity->declaration;
5593 if (declaration->implicit)
5596 if (!declaration->used) {
5597 print_in_function();
5598 const char *what = get_entity_kind_name(entity->kind);
5599 warningf(&entity->base.source_position, "%s '%Y' is unused",
5600 what, entity->base.symbol);
5601 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5602 print_in_function();
5603 const char *what = get_entity_kind_name(entity->kind);
5604 warningf(&entity->base.source_position, "%s '%Y' is never read",
5605 what, entity->base.symbol);
5613 static void check_unused_variables(statement_t *const stmt, void *const env)
5617 switch (stmt->kind) {
5618 case STATEMENT_DECLARATION: {
5619 declaration_statement_t const *const decls = &stmt->declaration;
5620 warn_unused_entity(decls->declarations_begin,
5621 decls->declarations_end);
5626 warn_unused_entity(stmt->fors.scope.entities, NULL);
5635 * Check declarations of current_function for unused entities.
5637 static void check_declarations(void)
5639 if (warning.unused_parameter) {
5640 const scope_t *scope = ¤t_function->parameters;
5642 /* do not issue unused warnings for main */
5643 if (!is_sym_main(current_function->base.base.symbol)) {
5644 warn_unused_entity(scope->entities, NULL);
5647 if (warning.unused_variable) {
5648 walk_statements(current_function->statement, check_unused_variables,
5653 static int determine_truth(expression_t const* const cond)
5656 !is_constant_expression(cond) ? 0 :
5657 fold_constant(cond) != 0 ? 1 :
5661 static void check_reachable(statement_t *);
5663 static bool expression_returns(expression_t const *const expr)
5665 switch (expr->kind) {
5667 expression_t const *const func = expr->call.function;
5668 if (func->kind == EXPR_REFERENCE) {
5669 entity_t *entity = func->reference.entity;
5670 if (entity->kind == ENTITY_FUNCTION
5671 && entity->declaration.modifiers & DM_NORETURN)
5675 if (!expression_returns(func))
5678 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5679 if (!expression_returns(arg->expression))
5686 case EXPR_REFERENCE:
5687 case EXPR_REFERENCE_ENUM_VALUE:
5689 case EXPR_CHARACTER_CONSTANT:
5690 case EXPR_WIDE_CHARACTER_CONSTANT:
5691 case EXPR_STRING_LITERAL:
5692 case EXPR_WIDE_STRING_LITERAL:
5693 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5694 case EXPR_LABEL_ADDRESS:
5695 case EXPR_CLASSIFY_TYPE:
5696 case EXPR_SIZEOF: // TODO handle obscure VLA case
5699 case EXPR_BUILTIN_SYMBOL:
5700 case EXPR_BUILTIN_CONSTANT_P:
5701 case EXPR_BUILTIN_PREFETCH:
5706 case EXPR_STATEMENT:
5707 check_reachable(expr->statement.statement);
5708 // TODO check if statement can be left
5711 case EXPR_CONDITIONAL:
5712 // TODO handle constant expression
5714 if (!expression_returns(expr->conditional.condition))
5717 if (expr->conditional.true_expression != NULL
5718 && expression_returns(expr->conditional.true_expression))
5721 return expression_returns(expr->conditional.false_expression);
5724 return expression_returns(expr->select.compound);
5726 case EXPR_ARRAY_ACCESS:
5728 expression_returns(expr->array_access.array_ref) &&
5729 expression_returns(expr->array_access.index);
5732 return expression_returns(expr->va_starte.ap);
5735 return expression_returns(expr->va_arge.ap);
5737 EXPR_UNARY_CASES_MANDATORY
5738 return expression_returns(expr->unary.value);
5740 case EXPR_UNARY_THROW:
5744 // TODO handle constant lhs of && and ||
5746 expression_returns(expr->binary.left) &&
5747 expression_returns(expr->binary.right);
5753 panic("unhandled expression");
5756 static bool initializer_returns(initializer_t const *const init)
5758 switch (init->kind) {
5759 case INITIALIZER_VALUE:
5760 return expression_returns(init->value.value);
5762 case INITIALIZER_LIST: {
5763 initializer_t * const* i = init->list.initializers;
5764 initializer_t * const* const end = i + init->list.len;
5765 bool returns = true;
5766 for (; i != end; ++i) {
5767 if (!initializer_returns(*i))
5773 case INITIALIZER_STRING:
5774 case INITIALIZER_WIDE_STRING:
5775 case INITIALIZER_DESIGNATOR: // designators have no payload
5778 panic("unhandled initializer");
5781 static bool noreturn_candidate;
5783 static void check_reachable(statement_t *const stmt)
5785 if (stmt->base.reachable)
5787 if (stmt->kind != STATEMENT_DO_WHILE)
5788 stmt->base.reachable = true;
5790 statement_t *last = stmt;
5792 switch (stmt->kind) {
5793 case STATEMENT_INVALID:
5794 case STATEMENT_EMPTY:
5795 case STATEMENT_LOCAL_LABEL:
5797 next = stmt->base.next;
5800 case STATEMENT_DECLARATION: {
5801 declaration_statement_t const *const decl = &stmt->declaration;
5802 entity_t const * ent = decl->declarations_begin;
5803 entity_t const *const last = decl->declarations_end;
5805 for (;; ent = ent->base.next) {
5806 if (ent->kind == ENTITY_VARIABLE &&
5807 ent->variable.initializer != NULL &&
5808 !initializer_returns(ent->variable.initializer)) {
5815 next = stmt->base.next;
5819 case STATEMENT_COMPOUND:
5820 next = stmt->compound.statements;
5823 case STATEMENT_RETURN: {
5824 expression_t const *const val = stmt->returns.value;
5825 if (val == NULL || expression_returns(val))
5826 noreturn_candidate = false;
5830 case STATEMENT_IF: {
5831 if_statement_t const *const ifs = &stmt->ifs;
5832 expression_t const *const cond = ifs->condition;
5834 if (!expression_returns(cond))
5837 int const val = determine_truth(cond);
5840 check_reachable(ifs->true_statement);
5845 if (ifs->false_statement != NULL) {
5846 check_reachable(ifs->false_statement);
5850 next = stmt->base.next;
5854 case STATEMENT_SWITCH: {
5855 switch_statement_t const *const switchs = &stmt->switchs;
5856 expression_t const *const expr = switchs->expression;
5858 if (!expression_returns(expr))
5861 if (is_constant_expression(expr)) {
5862 long const val = fold_constant(expr);
5863 case_label_statement_t * defaults = NULL;
5864 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5865 if (i->expression == NULL) {
5870 if (i->first_case <= val && val <= i->last_case) {
5871 check_reachable((statement_t*)i);
5876 if (defaults != NULL) {
5877 check_reachable((statement_t*)defaults);
5881 bool has_default = false;
5882 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5883 if (i->expression == NULL)
5886 check_reachable((statement_t*)i);
5893 next = stmt->base.next;
5897 case STATEMENT_EXPRESSION: {
5898 /* Check for noreturn function call */
5899 expression_t const *const expr = stmt->expression.expression;
5900 if (!expression_returns(expr))
5903 next = stmt->base.next;
5907 case STATEMENT_CONTINUE: {
5908 statement_t *parent = stmt;
5910 parent = parent->base.parent;
5911 if (parent == NULL) /* continue not within loop */
5915 switch (parent->kind) {
5916 case STATEMENT_WHILE: goto continue_while;
5917 case STATEMENT_DO_WHILE: goto continue_do_while;
5918 case STATEMENT_FOR: goto continue_for;
5925 case STATEMENT_BREAK: {
5926 statement_t *parent = stmt;
5928 parent = parent->base.parent;
5929 if (parent == NULL) /* break not within loop/switch */
5932 switch (parent->kind) {
5933 case STATEMENT_SWITCH:
5934 case STATEMENT_WHILE:
5935 case STATEMENT_DO_WHILE:
5938 next = parent->base.next;
5939 goto found_break_parent;
5948 case STATEMENT_GOTO:
5949 if (stmt->gotos.expression) {
5950 if (!expression_returns(stmt->gotos.expression))
5953 statement_t *parent = stmt->base.parent;
5954 if (parent == NULL) /* top level goto */
5958 next = stmt->gotos.label->statement;
5959 if (next == NULL) /* missing label */
5964 case STATEMENT_LABEL:
5965 next = stmt->label.statement;
5968 case STATEMENT_CASE_LABEL:
5969 next = stmt->case_label.statement;
5972 case STATEMENT_WHILE: {
5973 while_statement_t const *const whiles = &stmt->whiles;
5974 expression_t const *const cond = whiles->condition;
5976 if (!expression_returns(cond))
5979 int const val = determine_truth(cond);
5982 check_reachable(whiles->body);
5987 next = stmt->base.next;
5991 case STATEMENT_DO_WHILE:
5992 next = stmt->do_while.body;
5995 case STATEMENT_FOR: {
5996 for_statement_t *const fors = &stmt->fors;
5998 if (fors->condition_reachable)
6000 fors->condition_reachable = true;
6002 expression_t const *const cond = fors->condition;
6007 } else if (expression_returns(cond)) {
6008 val = determine_truth(cond);
6014 check_reachable(fors->body);
6019 next = stmt->base.next;
6023 case STATEMENT_MS_TRY: {
6024 ms_try_statement_t const *const ms_try = &stmt->ms_try;
6025 check_reachable(ms_try->try_statement);
6026 next = ms_try->final_statement;
6030 case STATEMENT_LEAVE: {
6031 statement_t *parent = stmt;
6033 parent = parent->base.parent;
6034 if (parent == NULL) /* __leave not within __try */
6037 if (parent->kind == STATEMENT_MS_TRY) {
6039 next = parent->ms_try.final_statement;
6047 panic("invalid statement kind");
6050 while (next == NULL) {
6051 next = last->base.parent;
6053 noreturn_candidate = false;
6055 type_t *const type = current_function->base.type;
6056 assert(is_type_function(type));
6057 type_t *const ret = skip_typeref(type->function.return_type);
6058 if (warning.return_type &&
6059 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
6060 is_type_valid(ret) &&
6061 !is_sym_main(current_function->base.base.symbol)) {
6062 warningf(&stmt->base.source_position,
6063 "control reaches end of non-void function");
6068 switch (next->kind) {
6069 case STATEMENT_INVALID:
6070 case STATEMENT_EMPTY:
6071 case STATEMENT_DECLARATION:
6072 case STATEMENT_LOCAL_LABEL:
6073 case STATEMENT_EXPRESSION:
6075 case STATEMENT_RETURN:
6076 case STATEMENT_CONTINUE:
6077 case STATEMENT_BREAK:
6078 case STATEMENT_GOTO:
6079 case STATEMENT_LEAVE:
6080 panic("invalid control flow in function");
6082 case STATEMENT_COMPOUND:
6084 case STATEMENT_SWITCH:
6085 case STATEMENT_LABEL:
6086 case STATEMENT_CASE_LABEL:
6088 next = next->base.next;
6091 case STATEMENT_WHILE: {
6093 if (next->base.reachable)
6095 next->base.reachable = true;
6097 while_statement_t const *const whiles = &next->whiles;
6098 expression_t const *const cond = whiles->condition;
6100 if (!expression_returns(cond))
6103 int const val = determine_truth(cond);
6106 check_reachable(whiles->body);
6112 next = next->base.next;
6116 case STATEMENT_DO_WHILE: {
6118 if (next->base.reachable)
6120 next->base.reachable = true;
6122 do_while_statement_t const *const dw = &next->do_while;
6123 expression_t const *const cond = dw->condition;
6125 if (!expression_returns(cond))
6128 int const val = determine_truth(cond);
6131 check_reachable(dw->body);
6137 next = next->base.next;
6141 case STATEMENT_FOR: {
6143 for_statement_t *const fors = &next->fors;
6145 fors->step_reachable = true;
6147 if (fors->condition_reachable)
6149 fors->condition_reachable = true;
6151 expression_t const *const cond = fors->condition;
6156 } else if (expression_returns(cond)) {
6157 val = determine_truth(cond);
6163 check_reachable(fors->body);
6169 next = next->base.next;
6173 case STATEMENT_MS_TRY:
6175 next = next->ms_try.final_statement;
6180 check_reachable(next);
6183 static void check_unreachable(statement_t* const stmt, void *const env)
6187 switch (stmt->kind) {
6188 case STATEMENT_DO_WHILE:
6189 if (!stmt->base.reachable) {
6190 expression_t const *const cond = stmt->do_while.condition;
6191 if (determine_truth(cond) >= 0) {
6192 warningf(&cond->base.source_position,
6193 "condition of do-while-loop is unreachable");
6198 case STATEMENT_FOR: {
6199 for_statement_t const* const fors = &stmt->fors;
6201 // if init and step are unreachable, cond is unreachable, too
6202 if (!stmt->base.reachable && !fors->step_reachable) {
6203 warningf(&stmt->base.source_position, "statement is unreachable");
6205 if (!stmt->base.reachable && fors->initialisation != NULL) {
6206 warningf(&fors->initialisation->base.source_position,
6207 "initialisation of for-statement is unreachable");
6210 if (!fors->condition_reachable && fors->condition != NULL) {
6211 warningf(&fors->condition->base.source_position,
6212 "condition of for-statement is unreachable");
6215 if (!fors->step_reachable && fors->step != NULL) {
6216 warningf(&fors->step->base.source_position,
6217 "step of for-statement is unreachable");
6223 case STATEMENT_COMPOUND:
6224 if (stmt->compound.statements != NULL)
6226 goto warn_unreachable;
6228 case STATEMENT_DECLARATION: {
6229 /* Only warn if there is at least one declarator with an initializer.
6230 * This typically occurs in switch statements. */
6231 declaration_statement_t const *const decl = &stmt->declaration;
6232 entity_t const * ent = decl->declarations_begin;
6233 entity_t const *const last = decl->declarations_end;
6235 for (;; ent = ent->base.next) {
6236 if (ent->kind == ENTITY_VARIABLE &&
6237 ent->variable.initializer != NULL) {
6238 goto warn_unreachable;
6248 if (!stmt->base.reachable)
6249 warningf(&stmt->base.source_position, "statement is unreachable");
6254 static void parse_external_declaration(void)
6256 /* function-definitions and declarations both start with declaration
6258 declaration_specifiers_t specifiers;
6259 memset(&specifiers, 0, sizeof(specifiers));
6261 add_anchor_token(';');
6262 parse_declaration_specifiers(&specifiers);
6263 rem_anchor_token(';');
6265 /* must be a declaration */
6266 if (token.type == ';') {
6267 parse_anonymous_declaration_rest(&specifiers);
6271 add_anchor_token(',');
6272 add_anchor_token('=');
6273 add_anchor_token(';');
6274 add_anchor_token('{');
6276 /* declarator is common to both function-definitions and declarations */
6277 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6279 rem_anchor_token('{');
6280 rem_anchor_token(';');
6281 rem_anchor_token('=');
6282 rem_anchor_token(',');
6284 /* must be a declaration */
6285 switch (token.type) {
6289 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6294 /* must be a function definition */
6295 parse_kr_declaration_list(ndeclaration);
6297 if (token.type != '{') {
6298 parse_error_expected("while parsing function definition", '{', NULL);
6299 eat_until_matching_token(';');
6303 assert(is_declaration(ndeclaration));
6304 type_t *type = skip_typeref(ndeclaration->declaration.type);
6306 if (!is_type_function(type)) {
6307 if (is_type_valid(type)) {
6308 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6309 type, ndeclaration->base.symbol);
6315 if (warning.aggregate_return &&
6316 is_type_compound(skip_typeref(type->function.return_type))) {
6317 warningf(HERE, "function '%Y' returns an aggregate",
6318 ndeclaration->base.symbol);
6320 if (warning.traditional && !type->function.unspecified_parameters) {
6321 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6322 ndeclaration->base.symbol);
6324 if (warning.old_style_definition && type->function.unspecified_parameters) {
6325 warningf(HERE, "old-style function definition '%Y'",
6326 ndeclaration->base.symbol);
6329 /* § 6.7.5.3 (14) a function definition with () means no
6330 * parameters (and not unspecified parameters) */
6331 if (type->function.unspecified_parameters
6332 && type->function.parameters == NULL
6333 && !type->function.kr_style_parameters) {
6334 type_t *duplicate = duplicate_type(type);
6335 duplicate->function.unspecified_parameters = false;
6337 type = typehash_insert(duplicate);
6338 if (type != duplicate) {
6339 obstack_free(type_obst, duplicate);
6341 ndeclaration->declaration.type = type;
6344 entity_t *const entity = record_entity(ndeclaration, true);
6345 assert(entity->kind == ENTITY_FUNCTION);
6346 assert(ndeclaration->kind == ENTITY_FUNCTION);
6348 function_t *function = &entity->function;
6349 if (ndeclaration != entity) {
6350 function->parameters = ndeclaration->function.parameters;
6352 assert(is_declaration(entity));
6353 type = skip_typeref(entity->declaration.type);
6355 /* push function parameters and switch scope */
6356 size_t const top = environment_top();
6357 scope_t *old_scope = scope_push(&function->parameters);
6359 entity_t *parameter = function->parameters.entities;
6360 for (; parameter != NULL; parameter = parameter->base.next) {
6361 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6362 parameter->base.parent_scope = current_scope;
6364 assert(parameter->base.parent_scope == NULL
6365 || parameter->base.parent_scope == current_scope);
6366 parameter->base.parent_scope = current_scope;
6367 if (parameter->base.symbol == NULL) {
6368 errorf(¶meter->base.source_position, "parameter name omitted");
6371 environment_push(parameter);
6374 if (function->statement != NULL) {
6375 parser_error_multiple_definition(entity, HERE);
6378 /* parse function body */
6379 int label_stack_top = label_top();
6380 function_t *old_current_function = current_function;
6381 current_function = function;
6382 current_parent = NULL;
6385 goto_anchor = &goto_first;
6387 label_anchor = &label_first;
6389 statement_t *const body = parse_compound_statement(false);
6390 function->statement = body;
6393 check_declarations();
6394 if (warning.return_type ||
6395 warning.unreachable_code ||
6396 (warning.missing_noreturn
6397 && !(function->base.modifiers & DM_NORETURN))) {
6398 noreturn_candidate = true;
6399 check_reachable(body);
6400 if (warning.unreachable_code)
6401 walk_statements(body, check_unreachable, NULL);
6402 if (warning.missing_noreturn &&
6403 noreturn_candidate &&
6404 !(function->base.modifiers & DM_NORETURN)) {
6405 warningf(&body->base.source_position,
6406 "function '%#T' is candidate for attribute 'noreturn'",
6407 type, entity->base.symbol);
6411 assert(current_parent == NULL);
6412 assert(current_function == function);
6413 current_function = old_current_function;
6414 label_pop_to(label_stack_top);
6417 assert(current_scope == &function->parameters);
6418 scope_pop(old_scope);
6419 environment_pop_to(top);
6422 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6423 source_position_t *source_position,
6424 const symbol_t *symbol)
6426 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6428 type->bitfield.base_type = base_type;
6429 type->bitfield.size_expression = size;
6432 type_t *skipped_type = skip_typeref(base_type);
6433 if (!is_type_integer(skipped_type)) {
6434 errorf(HERE, "bitfield base type '%T' is not an integer type",
6438 bit_size = skipped_type->base.size * 8;
6441 if (is_constant_expression(size)) {
6442 long v = fold_constant(size);
6445 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6446 } else if (v == 0) {
6447 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6448 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6449 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6451 type->bitfield.bit_size = v;
6458 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6460 entity_t *iter = compound->members.entities;
6461 for (; iter != NULL; iter = iter->base.next) {
6462 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6465 if (iter->base.symbol == symbol) {
6467 } else if (iter->base.symbol == NULL) {
6468 type_t *type = skip_typeref(iter->declaration.type);
6469 if (is_type_compound(type)) {
6471 = find_compound_entry(type->compound.compound, symbol);
6482 static void parse_compound_declarators(compound_t *compound,
6483 const declaration_specifiers_t *specifiers)
6488 if (token.type == ':') {
6489 source_position_t source_position = *HERE;
6492 type_t *base_type = specifiers->type;
6493 expression_t *size = parse_constant_expression();
6495 type_t *type = make_bitfield_type(base_type, size,
6496 &source_position, sym_anonymous);
6498 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6499 entity->base.namespc = NAMESPACE_NORMAL;
6500 entity->base.source_position = source_position;
6501 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6502 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6503 entity->declaration.modifiers = specifiers->modifiers;
6504 entity->declaration.type = type;
6506 entity = parse_declarator(specifiers,
6507 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6508 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6510 if (token.type == ':') {
6511 source_position_t source_position = *HERE;
6513 expression_t *size = parse_constant_expression();
6515 type_t *type = entity->declaration.type;
6516 type_t *bitfield_type = make_bitfield_type(type, size,
6517 &source_position, entity->base.symbol);
6518 entity->declaration.type = bitfield_type;
6522 /* make sure we don't define a symbol multiple times */
6523 symbol_t *symbol = entity->base.symbol;
6524 if (symbol != NULL) {
6525 entity_t *prev = find_compound_entry(compound, symbol);
6528 errorf(&entity->base.source_position,
6529 "multiple declarations of symbol '%Y' (declared %P)",
6530 symbol, &prev->base.source_position);
6534 append_entity(&compound->members, entity);
6536 type_t *orig_type = entity->declaration.type;
6537 type_t *type = skip_typeref(orig_type);
6538 if (is_type_function(type)) {
6539 errorf(&entity->base.source_position,
6540 "compound member '%Y' must not have function type '%T'",
6541 entity->base.symbol, orig_type);
6542 } else if (is_type_incomplete(type)) {
6543 /* §6.7.2.1:16 flexible array member */
6544 if (is_type_array(type) &&
6545 token.type == ';' &&
6546 look_ahead(1)->type == '}') {
6547 compound->has_flexible_member = true;
6549 errorf(&entity->base.source_position,
6550 "compound member '%Y' has incomplete type '%T'",
6551 entity->base.symbol, orig_type);
6555 if (token.type != ',')
6559 expect(';', end_error);
6562 anonymous_entity = NULL;
6565 static void parse_compound_type_entries(compound_t *compound)
6568 add_anchor_token('}');
6570 while (token.type != '}') {
6571 if (token.type == T_EOF) {
6572 errorf(HERE, "EOF while parsing struct");
6575 declaration_specifiers_t specifiers;
6576 memset(&specifiers, 0, sizeof(specifiers));
6577 parse_declaration_specifiers(&specifiers);
6579 parse_compound_declarators(compound, &specifiers);
6581 rem_anchor_token('}');
6585 compound->complete = true;
6588 static type_t *parse_typename(void)
6590 declaration_specifiers_t specifiers;
6591 memset(&specifiers, 0, sizeof(specifiers));
6592 parse_declaration_specifiers(&specifiers);
6593 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6594 specifiers.thread_local) {
6595 /* TODO: improve error message, user does probably not know what a
6596 * storage class is...
6598 errorf(HERE, "typename may not have a storage class");
6601 type_t *result = parse_abstract_declarator(specifiers.type);
6609 typedef expression_t* (*parse_expression_function)(void);
6610 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6612 typedef struct expression_parser_function_t expression_parser_function_t;
6613 struct expression_parser_function_t {
6614 parse_expression_function parser;
6615 unsigned infix_precedence;
6616 parse_expression_infix_function infix_parser;
6619 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6622 * Prints an error message if an expression was expected but not read
6624 static expression_t *expected_expression_error(void)
6626 /* skip the error message if the error token was read */
6627 if (token.type != T_ERROR) {
6628 errorf(HERE, "expected expression, got token %K", &token);
6632 return create_invalid_expression();
6636 * Parse a string constant.
6638 static expression_t *parse_string_const(void)
6641 if (token.type == T_STRING_LITERAL) {
6642 string_t res = token.v.string;
6644 while (token.type == T_STRING_LITERAL) {
6645 res = concat_strings(&res, &token.v.string);
6648 if (token.type != T_WIDE_STRING_LITERAL) {
6649 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6650 /* note: that we use type_char_ptr here, which is already the
6651 * automatic converted type. revert_automatic_type_conversion
6652 * will construct the array type */
6653 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6654 cnst->string.value = res;
6658 wres = concat_string_wide_string(&res, &token.v.wide_string);
6660 wres = token.v.wide_string;
6665 switch (token.type) {
6666 case T_WIDE_STRING_LITERAL:
6667 wres = concat_wide_strings(&wres, &token.v.wide_string);
6670 case T_STRING_LITERAL:
6671 wres = concat_wide_string_string(&wres, &token.v.string);
6675 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6676 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6677 cnst->wide_string.value = wres;
6686 * Parse a boolean constant.
6688 static expression_t *parse_bool_const(bool value)
6690 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6691 cnst->base.type = type_bool;
6692 cnst->conste.v.int_value = value;
6700 * Parse an integer constant.
6702 static expression_t *parse_int_const(void)
6704 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6705 cnst->base.type = token.datatype;
6706 cnst->conste.v.int_value = token.v.intvalue;
6714 * Parse a character constant.
6716 static expression_t *parse_character_constant(void)
6718 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6719 cnst->base.type = token.datatype;
6720 cnst->conste.v.character = token.v.string;
6722 if (cnst->conste.v.character.size != 1) {
6724 errorf(HERE, "more than 1 character in character constant");
6725 } else if (warning.multichar) {
6726 warningf(HERE, "multi-character character constant");
6735 * Parse a wide character constant.
6737 static expression_t *parse_wide_character_constant(void)
6739 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6740 cnst->base.type = token.datatype;
6741 cnst->conste.v.wide_character = token.v.wide_string;
6743 if (cnst->conste.v.wide_character.size != 1) {
6745 errorf(HERE, "more than 1 character in character constant");
6746 } else if (warning.multichar) {
6747 warningf(HERE, "multi-character character constant");
6756 * Parse a float constant.
6758 static expression_t *parse_float_const(void)
6760 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6761 cnst->base.type = token.datatype;
6762 cnst->conste.v.float_value = token.v.floatvalue;
6769 static entity_t *create_implicit_function(symbol_t *symbol,
6770 const source_position_t *source_position)
6772 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6773 ntype->function.return_type = type_int;
6774 ntype->function.unspecified_parameters = true;
6775 ntype->function.linkage = LINKAGE_C;
6777 type_t *type = typehash_insert(ntype);
6778 if (type != ntype) {
6782 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6783 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6784 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6785 entity->declaration.type = type;
6786 entity->declaration.implicit = true;
6787 entity->base.symbol = symbol;
6788 entity->base.source_position = *source_position;
6790 bool strict_prototypes_old = warning.strict_prototypes;
6791 warning.strict_prototypes = false;
6792 record_entity(entity, false);
6793 warning.strict_prototypes = strict_prototypes_old;
6799 * Creates a return_type (func)(argument_type) function type if not
6802 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6803 type_t *argument_type2)
6805 function_parameter_t *parameter2
6806 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6807 memset(parameter2, 0, sizeof(parameter2[0]));
6808 parameter2->type = argument_type2;
6810 function_parameter_t *parameter1
6811 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6812 memset(parameter1, 0, sizeof(parameter1[0]));
6813 parameter1->type = argument_type1;
6814 parameter1->next = parameter2;
6816 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6817 type->function.return_type = return_type;
6818 type->function.parameters = parameter1;
6820 type_t *result = typehash_insert(type);
6821 if (result != type) {
6829 * Creates a return_type (func)(argument_type) function type if not
6832 * @param return_type the return type
6833 * @param argument_type the argument type
6835 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6837 function_parameter_t *parameter
6838 = obstack_alloc(type_obst, sizeof(parameter[0]));
6839 memset(parameter, 0, sizeof(parameter[0]));
6840 parameter->type = argument_type;
6842 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6843 type->function.return_type = return_type;
6844 type->function.parameters = parameter;
6846 type_t *result = typehash_insert(type);
6847 if (result != type) {
6854 static type_t *make_function_0_type(type_t *return_type)
6856 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6857 type->function.return_type = return_type;
6858 type->function.parameters = NULL;
6860 type_t *result = typehash_insert(type);
6861 if (result != type) {
6869 * Creates a function type for some function like builtins.
6871 * @param symbol the symbol describing the builtin
6873 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6875 switch (symbol->ID) {
6876 case T___builtin_alloca:
6877 return make_function_1_type(type_void_ptr, type_size_t);
6878 case T___builtin_huge_val:
6879 return make_function_0_type(type_double);
6880 case T___builtin_inf:
6881 return make_function_0_type(type_double);
6882 case T___builtin_inff:
6883 return make_function_0_type(type_float);
6884 case T___builtin_infl:
6885 return make_function_0_type(type_long_double);
6886 case T___builtin_nan:
6887 return make_function_1_type(type_double, type_char_ptr);
6888 case T___builtin_nanf:
6889 return make_function_1_type(type_float, type_char_ptr);
6890 case T___builtin_nanl:
6891 return make_function_1_type(type_long_double, type_char_ptr);
6892 case T___builtin_va_end:
6893 return make_function_1_type(type_void, type_valist);
6894 case T___builtin_expect:
6895 return make_function_2_type(type_long, type_long, type_long);
6897 internal_errorf(HERE, "not implemented builtin identifier found");
6902 * Performs automatic type cast as described in § 6.3.2.1.
6904 * @param orig_type the original type
6906 static type_t *automatic_type_conversion(type_t *orig_type)
6908 type_t *type = skip_typeref(orig_type);
6909 if (is_type_array(type)) {
6910 array_type_t *array_type = &type->array;
6911 type_t *element_type = array_type->element_type;
6912 unsigned qualifiers = array_type->base.qualifiers;
6914 return make_pointer_type(element_type, qualifiers);
6917 if (is_type_function(type)) {
6918 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6925 * reverts the automatic casts of array to pointer types and function
6926 * to function-pointer types as defined § 6.3.2.1
6928 type_t *revert_automatic_type_conversion(const expression_t *expression)
6930 switch (expression->kind) {
6931 case EXPR_REFERENCE: {
6932 entity_t *entity = expression->reference.entity;
6933 if (is_declaration(entity)) {
6934 return entity->declaration.type;
6935 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6936 return entity->enum_value.enum_type;
6938 panic("no declaration or enum in reference");
6943 entity_t *entity = expression->select.compound_entry;
6944 assert(is_declaration(entity));
6945 type_t *type = entity->declaration.type;
6946 return get_qualified_type(type,
6947 expression->base.type->base.qualifiers);
6950 case EXPR_UNARY_DEREFERENCE: {
6951 const expression_t *const value = expression->unary.value;
6952 type_t *const type = skip_typeref(value->base.type);
6953 assert(is_type_pointer(type));
6954 return type->pointer.points_to;
6957 case EXPR_BUILTIN_SYMBOL:
6958 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6960 case EXPR_ARRAY_ACCESS: {
6961 const expression_t *array_ref = expression->array_access.array_ref;
6962 type_t *type_left = skip_typeref(array_ref->base.type);
6963 if (!is_type_valid(type_left))
6965 assert(is_type_pointer(type_left));
6966 return type_left->pointer.points_to;
6969 case EXPR_STRING_LITERAL: {
6970 size_t size = expression->string.value.size;
6971 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6974 case EXPR_WIDE_STRING_LITERAL: {
6975 size_t size = expression->wide_string.value.size;
6976 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6979 case EXPR_COMPOUND_LITERAL:
6980 return expression->compound_literal.type;
6985 return expression->base.type;
6988 static expression_t *parse_reference(void)
6990 symbol_t *const symbol = token.v.symbol;
6992 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6994 if (entity == NULL) {
6995 if (!strict_mode && look_ahead(1)->type == '(') {
6996 /* an implicitly declared function */
6997 if (warning.error_implicit_function_declaration) {
6998 errorf(HERE, "implicit declaration of function '%Y'", symbol);
6999 } else if (warning.implicit_function_declaration) {
7000 warningf(HERE, "implicit declaration of function '%Y'", symbol);
7003 entity = create_implicit_function(symbol, HERE);
7005 errorf(HERE, "unknown identifier '%Y' found.", symbol);
7006 entity = create_error_entity(symbol, ENTITY_VARIABLE);
7012 if (is_declaration(entity)) {
7013 orig_type = entity->declaration.type;
7014 } else if (entity->kind == ENTITY_ENUM_VALUE) {
7015 orig_type = entity->enum_value.enum_type;
7016 } else if (entity->kind == ENTITY_TYPEDEF) {
7017 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
7020 return create_invalid_expression();
7022 panic("expected declaration or enum value in reference");
7025 /* we always do the auto-type conversions; the & and sizeof parser contains
7026 * code to revert this! */
7027 type_t *type = automatic_type_conversion(orig_type);
7029 expression_kind_t kind = EXPR_REFERENCE;
7030 if (entity->kind == ENTITY_ENUM_VALUE)
7031 kind = EXPR_REFERENCE_ENUM_VALUE;
7033 expression_t *expression = allocate_expression_zero(kind);
7034 expression->reference.entity = entity;
7035 expression->base.type = type;
7037 /* this declaration is used */
7038 if (is_declaration(entity)) {
7039 entity->declaration.used = true;
7042 if (entity->base.parent_scope != file_scope
7043 && entity->base.parent_scope->depth < current_function->parameters.depth
7044 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
7045 if (entity->kind == ENTITY_VARIABLE) {
7046 /* access of a variable from an outer function */
7047 entity->variable.address_taken = true;
7048 } else if (entity->kind == ENTITY_PARAMETER) {
7049 entity->parameter.address_taken = true;
7051 current_function->need_closure = true;
7054 /* check for deprecated functions */
7055 if (warning.deprecated_declarations
7056 && is_declaration(entity)
7057 && entity->declaration.modifiers & DM_DEPRECATED) {
7058 declaration_t *declaration = &entity->declaration;
7060 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
7061 "function" : "variable";
7063 if (declaration->deprecated_string != NULL) {
7064 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
7065 prefix, entity->base.symbol, &entity->base.source_position,
7066 declaration->deprecated_string);
7068 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
7069 entity->base.symbol, &entity->base.source_position);
7073 if (warning.init_self && entity == current_init_decl && !in_type_prop
7074 && entity->kind == ENTITY_VARIABLE) {
7075 current_init_decl = NULL;
7076 warningf(HERE, "variable '%#T' is initialized by itself",
7077 entity->declaration.type, entity->base.symbol);
7084 static bool semantic_cast(expression_t *cast)
7086 expression_t *expression = cast->unary.value;
7087 type_t *orig_dest_type = cast->base.type;
7088 type_t *orig_type_right = expression->base.type;
7089 type_t const *dst_type = skip_typeref(orig_dest_type);
7090 type_t const *src_type = skip_typeref(orig_type_right);
7091 source_position_t const *pos = &cast->base.source_position;
7093 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7094 if (dst_type == type_void)
7097 /* only integer and pointer can be casted to pointer */
7098 if (is_type_pointer(dst_type) &&
7099 !is_type_pointer(src_type) &&
7100 !is_type_integer(src_type) &&
7101 is_type_valid(src_type)) {
7102 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7106 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7107 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7111 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7112 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7116 if (warning.cast_qual &&
7117 is_type_pointer(src_type) &&
7118 is_type_pointer(dst_type)) {
7119 type_t *src = skip_typeref(src_type->pointer.points_to);
7120 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7121 unsigned missing_qualifiers =
7122 src->base.qualifiers & ~dst->base.qualifiers;
7123 if (missing_qualifiers != 0) {
7125 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7126 missing_qualifiers, orig_type_right);
7132 static expression_t *parse_compound_literal(type_t *type)
7134 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7136 parse_initializer_env_t env;
7139 env.must_be_constant = false;
7140 initializer_t *initializer = parse_initializer(&env);
7143 expression->compound_literal.initializer = initializer;
7144 expression->compound_literal.type = type;
7145 expression->base.type = automatic_type_conversion(type);
7151 * Parse a cast expression.
7153 static expression_t *parse_cast(void)
7155 add_anchor_token(')');
7157 source_position_t source_position = token.source_position;
7159 type_t *type = parse_typename();
7161 rem_anchor_token(')');
7162 expect(')', end_error);
7164 if (token.type == '{') {
7165 return parse_compound_literal(type);
7168 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7169 cast->base.source_position = source_position;
7171 expression_t *value = parse_sub_expression(PREC_CAST);
7172 cast->base.type = type;
7173 cast->unary.value = value;
7175 if (! semantic_cast(cast)) {
7176 /* TODO: record the error in the AST. else it is impossible to detect it */
7181 return create_invalid_expression();
7185 * Parse a statement expression.
7187 static expression_t *parse_statement_expression(void)
7189 add_anchor_token(')');
7191 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7193 statement_t *statement = parse_compound_statement(true);
7194 expression->statement.statement = statement;
7196 /* find last statement and use its type */
7197 type_t *type = type_void;
7198 const statement_t *stmt = statement->compound.statements;
7200 while (stmt->base.next != NULL)
7201 stmt = stmt->base.next;
7203 if (stmt->kind == STATEMENT_EXPRESSION) {
7204 type = stmt->expression.expression->base.type;
7206 } else if (warning.other) {
7207 warningf(&expression->base.source_position, "empty statement expression ({})");
7209 expression->base.type = type;
7211 rem_anchor_token(')');
7212 expect(')', end_error);
7219 * Parse a parenthesized expression.
7221 static expression_t *parse_parenthesized_expression(void)
7225 switch (token.type) {
7227 /* gcc extension: a statement expression */
7228 return parse_statement_expression();
7232 return parse_cast();
7234 if (is_typedef_symbol(token.v.symbol)) {
7235 return parse_cast();
7239 add_anchor_token(')');
7240 expression_t *result = parse_expression();
7241 result->base.parenthesized = true;
7242 rem_anchor_token(')');
7243 expect(')', end_error);
7249 static expression_t *parse_function_keyword(void)
7253 if (current_function == NULL) {
7254 errorf(HERE, "'__func__' used outside of a function");
7257 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7258 expression->base.type = type_char_ptr;
7259 expression->funcname.kind = FUNCNAME_FUNCTION;
7266 static expression_t *parse_pretty_function_keyword(void)
7268 if (current_function == NULL) {
7269 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7272 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7273 expression->base.type = type_char_ptr;
7274 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7276 eat(T___PRETTY_FUNCTION__);
7281 static expression_t *parse_funcsig_keyword(void)
7283 if (current_function == NULL) {
7284 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7287 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7288 expression->base.type = type_char_ptr;
7289 expression->funcname.kind = FUNCNAME_FUNCSIG;
7296 static expression_t *parse_funcdname_keyword(void)
7298 if (current_function == NULL) {
7299 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7302 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7303 expression->base.type = type_char_ptr;
7304 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7306 eat(T___FUNCDNAME__);
7311 static designator_t *parse_designator(void)
7313 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7314 result->source_position = *HERE;
7316 if (token.type != T_IDENTIFIER) {
7317 parse_error_expected("while parsing member designator",
7318 T_IDENTIFIER, NULL);
7321 result->symbol = token.v.symbol;
7324 designator_t *last_designator = result;
7326 if (token.type == '.') {
7328 if (token.type != T_IDENTIFIER) {
7329 parse_error_expected("while parsing member designator",
7330 T_IDENTIFIER, NULL);
7333 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7334 designator->source_position = *HERE;
7335 designator->symbol = token.v.symbol;
7338 last_designator->next = designator;
7339 last_designator = designator;
7342 if (token.type == '[') {
7344 add_anchor_token(']');
7345 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7346 designator->source_position = *HERE;
7347 designator->array_index = parse_expression();
7348 rem_anchor_token(']');
7349 expect(']', end_error);
7350 if (designator->array_index == NULL) {
7354 last_designator->next = designator;
7355 last_designator = designator;
7367 * Parse the __builtin_offsetof() expression.
7369 static expression_t *parse_offsetof(void)
7371 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7372 expression->base.type = type_size_t;
7374 eat(T___builtin_offsetof);
7376 expect('(', end_error);
7377 add_anchor_token(',');
7378 type_t *type = parse_typename();
7379 rem_anchor_token(',');
7380 expect(',', end_error);
7381 add_anchor_token(')');
7382 designator_t *designator = parse_designator();
7383 rem_anchor_token(')');
7384 expect(')', end_error);
7386 expression->offsetofe.type = type;
7387 expression->offsetofe.designator = designator;
7390 memset(&path, 0, sizeof(path));
7391 path.top_type = type;
7392 path.path = NEW_ARR_F(type_path_entry_t, 0);
7394 descend_into_subtype(&path);
7396 if (!walk_designator(&path, designator, true)) {
7397 return create_invalid_expression();
7400 DEL_ARR_F(path.path);
7404 return create_invalid_expression();
7408 * Parses a _builtin_va_start() expression.
7410 static expression_t *parse_va_start(void)
7412 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7414 eat(T___builtin_va_start);
7416 expect('(', end_error);
7417 add_anchor_token(',');
7418 expression->va_starte.ap = parse_assignment_expression();
7419 rem_anchor_token(',');
7420 expect(',', end_error);
7421 expression_t *const expr = parse_assignment_expression();
7422 if (expr->kind == EXPR_REFERENCE) {
7423 entity_t *const entity = expr->reference.entity;
7424 if (entity->base.parent_scope != ¤t_function->parameters
7425 || entity->base.next != NULL
7426 || entity->kind != ENTITY_PARAMETER) {
7427 errorf(&expr->base.source_position,
7428 "second argument of 'va_start' must be last parameter of the current function");
7430 expression->va_starte.parameter = &entity->variable;
7432 expect(')', end_error);
7435 expect(')', end_error);
7437 return create_invalid_expression();
7441 * Parses a _builtin_va_arg() expression.
7443 static expression_t *parse_va_arg(void)
7445 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7447 eat(T___builtin_va_arg);
7449 expect('(', end_error);
7450 expression->va_arge.ap = parse_assignment_expression();
7451 expect(',', end_error);
7452 expression->base.type = parse_typename();
7453 expect(')', end_error);
7457 return create_invalid_expression();
7460 static expression_t *parse_builtin_symbol(void)
7462 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7464 symbol_t *symbol = token.v.symbol;
7466 expression->builtin_symbol.symbol = symbol;
7469 type_t *type = get_builtin_symbol_type(symbol);
7470 type = automatic_type_conversion(type);
7472 expression->base.type = type;
7477 * Parses a __builtin_constant() expression.
7479 static expression_t *parse_builtin_constant(void)
7481 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7483 eat(T___builtin_constant_p);
7485 expect('(', end_error);
7486 add_anchor_token(')');
7487 expression->builtin_constant.value = parse_assignment_expression();
7488 rem_anchor_token(')');
7489 expect(')', end_error);
7490 expression->base.type = type_int;
7494 return create_invalid_expression();
7498 * Parses a __builtin_prefetch() expression.
7500 static expression_t *parse_builtin_prefetch(void)
7502 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7504 eat(T___builtin_prefetch);
7506 expect('(', end_error);
7507 add_anchor_token(')');
7508 expression->builtin_prefetch.adr = parse_assignment_expression();
7509 if (token.type == ',') {
7511 expression->builtin_prefetch.rw = parse_assignment_expression();
7513 if (token.type == ',') {
7515 expression->builtin_prefetch.locality = parse_assignment_expression();
7517 rem_anchor_token(')');
7518 expect(')', end_error);
7519 expression->base.type = type_void;
7523 return create_invalid_expression();
7527 * Parses a __builtin_is_*() compare expression.
7529 static expression_t *parse_compare_builtin(void)
7531 expression_t *expression;
7533 switch (token.type) {
7534 case T___builtin_isgreater:
7535 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7537 case T___builtin_isgreaterequal:
7538 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7540 case T___builtin_isless:
7541 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7543 case T___builtin_islessequal:
7544 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7546 case T___builtin_islessgreater:
7547 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7549 case T___builtin_isunordered:
7550 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7553 internal_errorf(HERE, "invalid compare builtin found");
7555 expression->base.source_position = *HERE;
7558 expect('(', end_error);
7559 expression->binary.left = parse_assignment_expression();
7560 expect(',', end_error);
7561 expression->binary.right = parse_assignment_expression();
7562 expect(')', end_error);
7564 type_t *const orig_type_left = expression->binary.left->base.type;
7565 type_t *const orig_type_right = expression->binary.right->base.type;
7567 type_t *const type_left = skip_typeref(orig_type_left);
7568 type_t *const type_right = skip_typeref(orig_type_right);
7569 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7570 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7571 type_error_incompatible("invalid operands in comparison",
7572 &expression->base.source_position, orig_type_left, orig_type_right);
7575 semantic_comparison(&expression->binary);
7580 return create_invalid_expression();
7585 * Parses a __builtin_expect(, end_error) expression.
7587 static expression_t *parse_builtin_expect(void, end_error)
7589 expression_t *expression
7590 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7592 eat(T___builtin_expect);
7594 expect('(', end_error);
7595 expression->binary.left = parse_assignment_expression();
7596 expect(',', end_error);
7597 expression->binary.right = parse_constant_expression();
7598 expect(')', end_error);
7600 expression->base.type = expression->binary.left->base.type;
7604 return create_invalid_expression();
7609 * Parses a MS assume() expression.
7611 static expression_t *parse_assume(void)
7613 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7617 expect('(', end_error);
7618 add_anchor_token(')');
7619 expression->unary.value = parse_assignment_expression();
7620 rem_anchor_token(')');
7621 expect(')', end_error);
7623 expression->base.type = type_void;
7626 return create_invalid_expression();
7630 * Return the declaration for a given label symbol or create a new one.
7632 * @param symbol the symbol of the label
7634 static label_t *get_label(symbol_t *symbol)
7637 assert(current_function != NULL);
7639 label = get_entity(symbol, NAMESPACE_LABEL);
7640 /* if we found a local label, we already created the declaration */
7641 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7642 if (label->base.parent_scope != current_scope) {
7643 assert(label->base.parent_scope->depth < current_scope->depth);
7644 current_function->goto_to_outer = true;
7646 return &label->label;
7649 label = get_entity(symbol, NAMESPACE_LABEL);
7650 /* if we found a label in the same function, then we already created the
7653 && label->base.parent_scope == ¤t_function->parameters) {
7654 return &label->label;
7657 /* otherwise we need to create a new one */
7658 label = allocate_entity_zero(ENTITY_LABEL);
7659 label->base.namespc = NAMESPACE_LABEL;
7660 label->base.symbol = symbol;
7664 return &label->label;
7668 * Parses a GNU && label address expression.
7670 static expression_t *parse_label_address(void)
7672 source_position_t source_position = token.source_position;
7674 if (token.type != T_IDENTIFIER) {
7675 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7678 symbol_t *symbol = token.v.symbol;
7681 label_t *label = get_label(symbol);
7683 label->address_taken = true;
7685 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7686 expression->base.source_position = source_position;
7688 /* label address is threaten as a void pointer */
7689 expression->base.type = type_void_ptr;
7690 expression->label_address.label = label;
7693 return create_invalid_expression();
7697 * Parse a microsoft __noop expression.
7699 static expression_t *parse_noop_expression(void)
7701 /* the result is a (int)0 */
7702 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7703 cnst->base.type = type_int;
7704 cnst->conste.v.int_value = 0;
7705 cnst->conste.is_ms_noop = true;
7709 if (token.type == '(') {
7710 /* parse arguments */
7712 add_anchor_token(')');
7713 add_anchor_token(',');
7715 if (token.type != ')') {
7717 (void)parse_assignment_expression();
7718 if (token.type != ',')
7724 rem_anchor_token(',');
7725 rem_anchor_token(')');
7726 expect(')', end_error);
7733 * Parses a primary expression.
7735 static expression_t *parse_primary_expression(void)
7737 switch (token.type) {
7738 case T_false: return parse_bool_const(false);
7739 case T_true: return parse_bool_const(true);
7740 case T_INTEGER: return parse_int_const();
7741 case T_CHARACTER_CONSTANT: return parse_character_constant();
7742 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7743 case T_FLOATINGPOINT: return parse_float_const();
7744 case T_STRING_LITERAL:
7745 case T_WIDE_STRING_LITERAL: return parse_string_const();
7746 case T_IDENTIFIER: return parse_reference();
7747 case T___FUNCTION__:
7748 case T___func__: return parse_function_keyword();
7749 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7750 case T___FUNCSIG__: return parse_funcsig_keyword();
7751 case T___FUNCDNAME__: return parse_funcdname_keyword();
7752 case T___builtin_offsetof: return parse_offsetof();
7753 case T___builtin_va_start: return parse_va_start();
7754 case T___builtin_va_arg: return parse_va_arg();
7755 case T___builtin_expect:
7756 case T___builtin_alloca:
7757 case T___builtin_inf:
7758 case T___builtin_inff:
7759 case T___builtin_infl:
7760 case T___builtin_nan:
7761 case T___builtin_nanf:
7762 case T___builtin_nanl:
7763 case T___builtin_huge_val:
7764 case T___builtin_va_end: return parse_builtin_symbol();
7765 case T___builtin_isgreater:
7766 case T___builtin_isgreaterequal:
7767 case T___builtin_isless:
7768 case T___builtin_islessequal:
7769 case T___builtin_islessgreater:
7770 case T___builtin_isunordered: return parse_compare_builtin();
7771 case T___builtin_constant_p: return parse_builtin_constant();
7772 case T___builtin_prefetch: return parse_builtin_prefetch();
7773 case T__assume: return parse_assume();
7776 return parse_label_address();
7779 case '(': return parse_parenthesized_expression();
7780 case T___noop: return parse_noop_expression();
7783 errorf(HERE, "unexpected token %K, expected an expression", &token);
7784 return create_invalid_expression();
7788 * Check if the expression has the character type and issue a warning then.
7790 static void check_for_char_index_type(const expression_t *expression)
7792 type_t *const type = expression->base.type;
7793 const type_t *const base_type = skip_typeref(type);
7795 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7796 warning.char_subscripts) {
7797 warningf(&expression->base.source_position,
7798 "array subscript has type '%T'", type);
7802 static expression_t *parse_array_expression(expression_t *left)
7804 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7807 add_anchor_token(']');
7809 expression_t *inside = parse_expression();
7811 type_t *const orig_type_left = left->base.type;
7812 type_t *const orig_type_inside = inside->base.type;
7814 type_t *const type_left = skip_typeref(orig_type_left);
7815 type_t *const type_inside = skip_typeref(orig_type_inside);
7817 type_t *return_type;
7818 array_access_expression_t *array_access = &expression->array_access;
7819 if (is_type_pointer(type_left)) {
7820 return_type = type_left->pointer.points_to;
7821 array_access->array_ref = left;
7822 array_access->index = inside;
7823 check_for_char_index_type(inside);
7824 } else if (is_type_pointer(type_inside)) {
7825 return_type = type_inside->pointer.points_to;
7826 array_access->array_ref = inside;
7827 array_access->index = left;
7828 array_access->flipped = true;
7829 check_for_char_index_type(left);
7831 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7833 "array access on object with non-pointer types '%T', '%T'",
7834 orig_type_left, orig_type_inside);
7836 return_type = type_error_type;
7837 array_access->array_ref = left;
7838 array_access->index = inside;
7841 expression->base.type = automatic_type_conversion(return_type);
7843 rem_anchor_token(']');
7844 expect(']', end_error);
7849 static expression_t *parse_typeprop(expression_kind_t const kind)
7851 expression_t *tp_expression = allocate_expression_zero(kind);
7852 tp_expression->base.type = type_size_t;
7854 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7856 /* we only refer to a type property, mark this case */
7857 bool old = in_type_prop;
7858 in_type_prop = true;
7861 expression_t *expression;
7862 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7864 add_anchor_token(')');
7865 orig_type = parse_typename();
7866 rem_anchor_token(')');
7867 expect(')', end_error);
7869 if (token.type == '{') {
7870 /* It was not sizeof(type) after all. It is sizeof of an expression
7871 * starting with a compound literal */
7872 expression = parse_compound_literal(orig_type);
7873 goto typeprop_expression;
7876 expression = parse_sub_expression(PREC_UNARY);
7878 typeprop_expression:
7879 tp_expression->typeprop.tp_expression = expression;
7881 orig_type = revert_automatic_type_conversion(expression);
7882 expression->base.type = orig_type;
7885 tp_expression->typeprop.type = orig_type;
7886 type_t const* const type = skip_typeref(orig_type);
7887 char const* const wrong_type =
7888 GNU_MODE && is_type_atomic(type, ATOMIC_TYPE_VOID) ? NULL :
7889 is_type_incomplete(type) ? "incomplete" :
7890 type->kind == TYPE_FUNCTION ? "function designator" :
7891 type->kind == TYPE_BITFIELD ? "bitfield" :
7893 if (wrong_type != NULL) {
7894 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7895 errorf(&tp_expression->base.source_position,
7896 "operand of %s expression must not be of %s type '%T'",
7897 what, wrong_type, orig_type);
7902 return tp_expression;
7905 static expression_t *parse_sizeof(void)
7907 return parse_typeprop(EXPR_SIZEOF);
7910 static expression_t *parse_alignof(void)
7912 return parse_typeprop(EXPR_ALIGNOF);
7915 static expression_t *parse_select_expression(expression_t *compound)
7917 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7918 select->select.compound = compound;
7920 assert(token.type == '.' || token.type == T_MINUSGREATER);
7921 bool is_pointer = (token.type == T_MINUSGREATER);
7924 if (token.type != T_IDENTIFIER) {
7925 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7928 symbol_t *symbol = token.v.symbol;
7931 type_t *const orig_type = compound->base.type;
7932 type_t *const type = skip_typeref(orig_type);
7935 bool saw_error = false;
7936 if (is_type_pointer(type)) {
7939 "request for member '%Y' in something not a struct or union, but '%T'",
7943 type_left = skip_typeref(type->pointer.points_to);
7945 if (is_pointer && is_type_valid(type)) {
7946 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7953 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7954 type_left->kind == TYPE_COMPOUND_UNION) {
7955 compound_t *compound = type_left->compound.compound;
7957 if (!compound->complete) {
7958 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7960 goto create_error_entry;
7963 entry = find_compound_entry(compound, symbol);
7964 if (entry == NULL) {
7965 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7966 goto create_error_entry;
7969 if (is_type_valid(type_left) && !saw_error) {
7971 "request for member '%Y' in something not a struct or union, but '%T'",
7975 entry = create_error_entity(symbol, ENTITY_COMPOUND_MEMBER);
7978 assert(is_declaration(entry));
7979 select->select.compound_entry = entry;
7981 type_t *entry_type = entry->declaration.type;
7983 = get_qualified_type(entry_type, type_left->base.qualifiers);
7985 /* we always do the auto-type conversions; the & and sizeof parser contains
7986 * code to revert this! */
7987 select->base.type = automatic_type_conversion(res_type);
7989 type_t *skipped = skip_typeref(res_type);
7990 if (skipped->kind == TYPE_BITFIELD) {
7991 select->base.type = skipped->bitfield.base_type;
7997 static void check_call_argument(const function_parameter_t *parameter,
7998 call_argument_t *argument, unsigned pos)
8000 type_t *expected_type = parameter->type;
8001 type_t *expected_type_skip = skip_typeref(expected_type);
8002 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
8003 expression_t *arg_expr = argument->expression;
8004 type_t *arg_type = skip_typeref(arg_expr->base.type);
8006 /* handle transparent union gnu extension */
8007 if (is_type_union(expected_type_skip)
8008 && (expected_type_skip->base.modifiers
8009 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
8010 compound_t *union_decl = expected_type_skip->compound.compound;
8011 type_t *best_type = NULL;
8012 entity_t *entry = union_decl->members.entities;
8013 for ( ; entry != NULL; entry = entry->base.next) {
8014 assert(is_declaration(entry));
8015 type_t *decl_type = entry->declaration.type;
8016 error = semantic_assign(decl_type, arg_expr);
8017 if (error == ASSIGN_ERROR_INCOMPATIBLE
8018 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
8021 if (error == ASSIGN_SUCCESS) {
8022 best_type = decl_type;
8023 } else if (best_type == NULL) {
8024 best_type = decl_type;
8028 if (best_type != NULL) {
8029 expected_type = best_type;
8033 error = semantic_assign(expected_type, arg_expr);
8034 argument->expression = create_implicit_cast(argument->expression,
8037 if (error != ASSIGN_SUCCESS) {
8038 /* report exact scope in error messages (like "in argument 3") */
8040 snprintf(buf, sizeof(buf), "call argument %u", pos);
8041 report_assign_error(error, expected_type, arg_expr, buf,
8042 &arg_expr->base.source_position);
8043 } else if (warning.traditional || warning.conversion) {
8044 type_t *const promoted_type = get_default_promoted_type(arg_type);
8045 if (!types_compatible(expected_type_skip, promoted_type) &&
8046 !types_compatible(expected_type_skip, type_void_ptr) &&
8047 !types_compatible(type_void_ptr, promoted_type)) {
8048 /* Deliberately show the skipped types in this warning */
8049 warningf(&arg_expr->base.source_position,
8050 "passing call argument %u as '%T' rather than '%T' due to prototype",
8051 pos, expected_type_skip, promoted_type);
8057 * Parse a call expression, ie. expression '( ... )'.
8059 * @param expression the function address
8061 static expression_t *parse_call_expression(expression_t *expression)
8063 expression_t *result = allocate_expression_zero(EXPR_CALL);
8064 call_expression_t *call = &result->call;
8065 call->function = expression;
8067 type_t *const orig_type = expression->base.type;
8068 type_t *const type = skip_typeref(orig_type);
8070 function_type_t *function_type = NULL;
8071 if (is_type_pointer(type)) {
8072 type_t *const to_type = skip_typeref(type->pointer.points_to);
8074 if (is_type_function(to_type)) {
8075 function_type = &to_type->function;
8076 call->base.type = function_type->return_type;
8080 if (function_type == NULL && is_type_valid(type)) {
8081 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
8084 /* parse arguments */
8086 add_anchor_token(')');
8087 add_anchor_token(',');
8089 if (token.type != ')') {
8090 call_argument_t *last_argument = NULL;
8093 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8095 argument->expression = parse_assignment_expression();
8096 if (last_argument == NULL) {
8097 call->arguments = argument;
8099 last_argument->next = argument;
8101 last_argument = argument;
8103 if (token.type != ',')
8108 rem_anchor_token(',');
8109 rem_anchor_token(')');
8110 expect(')', end_error);
8112 if (function_type == NULL)
8115 function_parameter_t *parameter = function_type->parameters;
8116 call_argument_t *argument = call->arguments;
8117 if (!function_type->unspecified_parameters) {
8118 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8119 parameter = parameter->next, argument = argument->next) {
8120 check_call_argument(parameter, argument, ++pos);
8123 if (parameter != NULL) {
8124 errorf(HERE, "too few arguments to function '%E'", expression);
8125 } else if (argument != NULL && !function_type->variadic) {
8126 errorf(HERE, "too many arguments to function '%E'", expression);
8130 /* do default promotion */
8131 for (; argument != NULL; argument = argument->next) {
8132 type_t *type = argument->expression->base.type;
8134 type = get_default_promoted_type(type);
8136 argument->expression
8137 = create_implicit_cast(argument->expression, type);
8140 check_format(&result->call);
8142 if (warning.aggregate_return &&
8143 is_type_compound(skip_typeref(function_type->return_type))) {
8144 warningf(&result->base.source_position,
8145 "function call has aggregate value");
8152 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8154 static bool same_compound_type(const type_t *type1, const type_t *type2)
8157 is_type_compound(type1) &&
8158 type1->kind == type2->kind &&
8159 type1->compound.compound == type2->compound.compound;
8162 static expression_t const *get_reference_address(expression_t const *expr)
8164 bool regular_take_address = true;
8166 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8167 expr = expr->unary.value;
8169 regular_take_address = false;
8172 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8175 expr = expr->unary.value;
8178 if (expr->kind != EXPR_REFERENCE)
8181 /* special case for functions which are automatically converted to a
8182 * pointer to function without an extra TAKE_ADDRESS operation */
8183 if (!regular_take_address &&
8184 expr->reference.entity->kind != ENTITY_FUNCTION) {
8191 static void warn_reference_address_as_bool(expression_t const* expr)
8193 if (!warning.address)
8196 expr = get_reference_address(expr);
8198 warningf(&expr->base.source_position,
8199 "the address of '%Y' will always evaluate as 'true'",
8200 expr->reference.entity->base.symbol);
8204 static void warn_assignment_in_condition(const expression_t *const expr)
8206 if (!warning.parentheses)
8208 if (expr->base.kind != EXPR_BINARY_ASSIGN)
8210 if (expr->base.parenthesized)
8212 warningf(&expr->base.source_position,
8213 "suggest parentheses around assignment used as truth value");
8216 static void semantic_condition(expression_t const *const expr,
8217 char const *const context)
8219 type_t *const type = skip_typeref(expr->base.type);
8220 if (is_type_scalar(type)) {
8221 warn_reference_address_as_bool(expr);
8222 warn_assignment_in_condition(expr);
8223 } else if (is_type_valid(type)) {
8224 errorf(&expr->base.source_position,
8225 "%s must have scalar type", context);
8230 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8232 * @param expression the conditional expression
8234 static expression_t *parse_conditional_expression(expression_t *expression)
8236 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8238 conditional_expression_t *conditional = &result->conditional;
8239 conditional->condition = expression;
8242 add_anchor_token(':');
8244 /* §6.5.15:2 The first operand shall have scalar type. */
8245 semantic_condition(expression, "condition of conditional operator");
8247 expression_t *true_expression = expression;
8248 bool gnu_cond = false;
8249 if (GNU_MODE && token.type == ':') {
8252 true_expression = parse_expression();
8254 rem_anchor_token(':');
8255 expect(':', end_error);
8257 expression_t *false_expression =
8258 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8260 type_t *const orig_true_type = true_expression->base.type;
8261 type_t *const orig_false_type = false_expression->base.type;
8262 type_t *const true_type = skip_typeref(orig_true_type);
8263 type_t *const false_type = skip_typeref(orig_false_type);
8266 type_t *result_type;
8267 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8268 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8269 /* ISO/IEC 14882:1998(E) §5.16:2 */
8270 if (true_expression->kind == EXPR_UNARY_THROW) {
8271 result_type = false_type;
8272 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8273 result_type = true_type;
8275 if (warning.other && (
8276 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8277 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8279 warningf(&conditional->base.source_position,
8280 "ISO C forbids conditional expression with only one void side");
8282 result_type = type_void;
8284 } else if (is_type_arithmetic(true_type)
8285 && is_type_arithmetic(false_type)) {
8286 result_type = semantic_arithmetic(true_type, false_type);
8288 true_expression = create_implicit_cast(true_expression, result_type);
8289 false_expression = create_implicit_cast(false_expression, result_type);
8291 conditional->true_expression = true_expression;
8292 conditional->false_expression = false_expression;
8293 conditional->base.type = result_type;
8294 } else if (same_compound_type(true_type, false_type)) {
8295 /* just take 1 of the 2 types */
8296 result_type = true_type;
8297 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8298 type_t *pointer_type;
8300 expression_t *other_expression;
8301 if (is_type_pointer(true_type) &&
8302 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8303 pointer_type = true_type;
8304 other_type = false_type;
8305 other_expression = false_expression;
8307 pointer_type = false_type;
8308 other_type = true_type;
8309 other_expression = true_expression;
8312 if (is_null_pointer_constant(other_expression)) {
8313 result_type = pointer_type;
8314 } else if (is_type_pointer(other_type)) {
8315 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8316 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8319 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8320 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8322 } else if (types_compatible(get_unqualified_type(to1),
8323 get_unqualified_type(to2))) {
8326 if (warning.other) {
8327 warningf(&conditional->base.source_position,
8328 "pointer types '%T' and '%T' in conditional expression are incompatible",
8329 true_type, false_type);
8334 type_t *const type =
8335 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8336 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8337 } else if (is_type_integer(other_type)) {
8338 if (warning.other) {
8339 warningf(&conditional->base.source_position,
8340 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8342 result_type = pointer_type;
8344 if (is_type_valid(other_type)) {
8345 type_error_incompatible("while parsing conditional",
8346 &expression->base.source_position, true_type, false_type);
8348 result_type = type_error_type;
8351 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8352 type_error_incompatible("while parsing conditional",
8353 &conditional->base.source_position, true_type,
8356 result_type = type_error_type;
8359 conditional->true_expression
8360 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8361 conditional->false_expression
8362 = create_implicit_cast(false_expression, result_type);
8363 conditional->base.type = result_type;
8368 * Parse an extension expression.
8370 static expression_t *parse_extension(void)
8372 eat(T___extension__);
8374 bool old_gcc_extension = in_gcc_extension;
8375 in_gcc_extension = true;
8376 expression_t *expression = parse_sub_expression(PREC_UNARY);
8377 in_gcc_extension = old_gcc_extension;
8382 * Parse a __builtin_classify_type() expression.
8384 static expression_t *parse_builtin_classify_type(void)
8386 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8387 result->base.type = type_int;
8389 eat(T___builtin_classify_type);
8391 expect('(', end_error);
8392 add_anchor_token(')');
8393 expression_t *expression = parse_expression();
8394 rem_anchor_token(')');
8395 expect(')', end_error);
8396 result->classify_type.type_expression = expression;
8400 return create_invalid_expression();
8404 * Parse a delete expression
8405 * ISO/IEC 14882:1998(E) §5.3.5
8407 static expression_t *parse_delete(void)
8409 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8410 result->base.type = type_void;
8414 if (token.type == '[') {
8416 result->kind = EXPR_UNARY_DELETE_ARRAY;
8417 expect(']', end_error);
8421 expression_t *const value = parse_sub_expression(PREC_CAST);
8422 result->unary.value = value;
8424 type_t *const type = skip_typeref(value->base.type);
8425 if (!is_type_pointer(type)) {
8426 errorf(&value->base.source_position,
8427 "operand of delete must have pointer type");
8428 } else if (warning.other &&
8429 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8430 warningf(&value->base.source_position,
8431 "deleting 'void*' is undefined");
8438 * Parse a throw expression
8439 * ISO/IEC 14882:1998(E) §15:1
8441 static expression_t *parse_throw(void)
8443 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8444 result->base.type = type_void;
8448 expression_t *value = NULL;
8449 switch (token.type) {
8451 value = parse_assignment_expression();
8452 /* ISO/IEC 14882:1998(E) §15.1:3 */
8453 type_t *const orig_type = value->base.type;
8454 type_t *const type = skip_typeref(orig_type);
8455 if (is_type_incomplete(type)) {
8456 errorf(&value->base.source_position,
8457 "cannot throw object of incomplete type '%T'", orig_type);
8458 } else if (is_type_pointer(type)) {
8459 type_t *const points_to = skip_typeref(type->pointer.points_to);
8460 if (is_type_incomplete(points_to) &&
8461 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8462 errorf(&value->base.source_position,
8463 "cannot throw pointer to incomplete type '%T'", orig_type);
8471 result->unary.value = value;
8476 static bool check_pointer_arithmetic(const source_position_t *source_position,
8477 type_t *pointer_type,
8478 type_t *orig_pointer_type)
8480 type_t *points_to = pointer_type->pointer.points_to;
8481 points_to = skip_typeref(points_to);
8483 if (is_type_incomplete(points_to)) {
8484 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8485 errorf(source_position,
8486 "arithmetic with pointer to incomplete type '%T' not allowed",
8489 } else if (warning.pointer_arith) {
8490 warningf(source_position,
8491 "pointer of type '%T' used in arithmetic",
8494 } else if (is_type_function(points_to)) {
8496 errorf(source_position,
8497 "arithmetic with pointer to function type '%T' not allowed",
8500 } else if (warning.pointer_arith) {
8501 warningf(source_position,
8502 "pointer to a function '%T' used in arithmetic",
8509 static bool is_lvalue(const expression_t *expression)
8511 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8512 switch (expression->kind) {
8513 case EXPR_ARRAY_ACCESS:
8514 case EXPR_COMPOUND_LITERAL:
8515 case EXPR_REFERENCE:
8517 case EXPR_UNARY_DEREFERENCE:
8521 type_t *type = skip_typeref(expression->base.type);
8523 /* ISO/IEC 14882:1998(E) §3.10:3 */
8524 is_type_reference(type) ||
8525 /* Claim it is an lvalue, if the type is invalid. There was a parse
8526 * error before, which maybe prevented properly recognizing it as
8528 !is_type_valid(type);
8533 static void semantic_incdec(unary_expression_t *expression)
8535 type_t *const orig_type = expression->value->base.type;
8536 type_t *const type = skip_typeref(orig_type);
8537 if (is_type_pointer(type)) {
8538 if (!check_pointer_arithmetic(&expression->base.source_position,
8542 } else if (!is_type_real(type) && is_type_valid(type)) {
8543 /* TODO: improve error message */
8544 errorf(&expression->base.source_position,
8545 "operation needs an arithmetic or pointer type");
8548 if (!is_lvalue(expression->value)) {
8549 /* TODO: improve error message */
8550 errorf(&expression->base.source_position, "lvalue required as operand");
8552 expression->base.type = orig_type;
8555 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8557 type_t *const orig_type = expression->value->base.type;
8558 type_t *const type = skip_typeref(orig_type);
8559 if (!is_type_arithmetic(type)) {
8560 if (is_type_valid(type)) {
8561 /* TODO: improve error message */
8562 errorf(&expression->base.source_position,
8563 "operation needs an arithmetic type");
8568 expression->base.type = orig_type;
8571 static void semantic_unexpr_plus(unary_expression_t *expression)
8573 semantic_unexpr_arithmetic(expression);
8574 if (warning.traditional)
8575 warningf(&expression->base.source_position,
8576 "traditional C rejects the unary plus operator");
8579 static void semantic_not(unary_expression_t *expression)
8581 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8582 semantic_condition(expression->value, "operand of !");
8583 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8586 static void semantic_unexpr_integer(unary_expression_t *expression)
8588 type_t *const orig_type = expression->value->base.type;
8589 type_t *const type = skip_typeref(orig_type);
8590 if (!is_type_integer(type)) {
8591 if (is_type_valid(type)) {
8592 errorf(&expression->base.source_position,
8593 "operand of ~ must be of integer type");
8598 expression->base.type = orig_type;
8601 static void semantic_dereference(unary_expression_t *expression)
8603 type_t *const orig_type = expression->value->base.type;
8604 type_t *const type = skip_typeref(orig_type);
8605 if (!is_type_pointer(type)) {
8606 if (is_type_valid(type)) {
8607 errorf(&expression->base.source_position,
8608 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8613 type_t *result_type = type->pointer.points_to;
8614 result_type = automatic_type_conversion(result_type);
8615 expression->base.type = result_type;
8619 * Record that an address is taken (expression represents an lvalue).
8621 * @param expression the expression
8622 * @param may_be_register if true, the expression might be an register
8624 static void set_address_taken(expression_t *expression, bool may_be_register)
8626 if (expression->kind != EXPR_REFERENCE)
8629 entity_t *const entity = expression->reference.entity;
8631 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8634 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8635 && !may_be_register) {
8636 errorf(&expression->base.source_position,
8637 "address of register %s '%Y' requested",
8638 get_entity_kind_name(entity->kind), entity->base.symbol);
8641 if (entity->kind == ENTITY_VARIABLE) {
8642 entity->variable.address_taken = true;
8644 assert(entity->kind == ENTITY_PARAMETER);
8645 entity->parameter.address_taken = true;
8650 * Check the semantic of the address taken expression.
8652 static void semantic_take_addr(unary_expression_t *expression)
8654 expression_t *value = expression->value;
8655 value->base.type = revert_automatic_type_conversion(value);
8657 type_t *orig_type = value->base.type;
8658 type_t *type = skip_typeref(orig_type);
8659 if (!is_type_valid(type))
8663 if (!is_lvalue(value)) {
8664 errorf(&expression->base.source_position, "'&' requires an lvalue");
8666 if (type->kind == TYPE_BITFIELD) {
8667 errorf(&expression->base.source_position,
8668 "'&' not allowed on object with bitfield type '%T'",
8672 set_address_taken(value, false);
8674 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8677 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8678 static expression_t *parse_##unexpression_type(void) \
8680 expression_t *unary_expression \
8681 = allocate_expression_zero(unexpression_type); \
8683 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8685 sfunc(&unary_expression->unary); \
8687 return unary_expression; \
8690 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8691 semantic_unexpr_arithmetic)
8692 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8693 semantic_unexpr_plus)
8694 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8696 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8697 semantic_dereference)
8698 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8700 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8701 semantic_unexpr_integer)
8702 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8704 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8707 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8709 static expression_t *parse_##unexpression_type(expression_t *left) \
8711 expression_t *unary_expression \
8712 = allocate_expression_zero(unexpression_type); \
8714 unary_expression->unary.value = left; \
8716 sfunc(&unary_expression->unary); \
8718 return unary_expression; \
8721 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8722 EXPR_UNARY_POSTFIX_INCREMENT,
8724 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8725 EXPR_UNARY_POSTFIX_DECREMENT,
8728 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8730 /* TODO: handle complex + imaginary types */
8732 type_left = get_unqualified_type(type_left);
8733 type_right = get_unqualified_type(type_right);
8735 /* § 6.3.1.8 Usual arithmetic conversions */
8736 if (type_left == type_long_double || type_right == type_long_double) {
8737 return type_long_double;
8738 } else if (type_left == type_double || type_right == type_double) {
8740 } else if (type_left == type_float || type_right == type_float) {
8744 type_left = promote_integer(type_left);
8745 type_right = promote_integer(type_right);
8747 if (type_left == type_right)
8750 bool const signed_left = is_type_signed(type_left);
8751 bool const signed_right = is_type_signed(type_right);
8752 int const rank_left = get_rank(type_left);
8753 int const rank_right = get_rank(type_right);
8755 if (signed_left == signed_right)
8756 return rank_left >= rank_right ? type_left : type_right;
8765 u_rank = rank_right;
8766 u_type = type_right;
8768 s_rank = rank_right;
8769 s_type = type_right;
8774 if (u_rank >= s_rank)
8777 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8779 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8780 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8784 case ATOMIC_TYPE_INT: return type_unsigned_int;
8785 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8786 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8788 default: panic("invalid atomic type");
8793 * Check the semantic restrictions for a binary expression.
8795 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8797 expression_t *const left = expression->left;
8798 expression_t *const right = expression->right;
8799 type_t *const orig_type_left = left->base.type;
8800 type_t *const orig_type_right = right->base.type;
8801 type_t *const type_left = skip_typeref(orig_type_left);
8802 type_t *const type_right = skip_typeref(orig_type_right);
8804 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8805 /* TODO: improve error message */
8806 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8807 errorf(&expression->base.source_position,
8808 "operation needs arithmetic types");
8813 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8814 expression->left = create_implicit_cast(left, arithmetic_type);
8815 expression->right = create_implicit_cast(right, arithmetic_type);
8816 expression->base.type = arithmetic_type;
8819 static void warn_div_by_zero(binary_expression_t const *const expression)
8821 if (!warning.div_by_zero ||
8822 !is_type_integer(expression->base.type))
8825 expression_t const *const right = expression->right;
8826 /* The type of the right operand can be different for /= */
8827 if (is_type_integer(right->base.type) &&
8828 is_constant_expression(right) &&
8829 fold_constant(right) == 0) {
8830 warningf(&expression->base.source_position, "division by zero");
8835 * Check the semantic restrictions for a div/mod expression.
8837 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8838 semantic_binexpr_arithmetic(expression);
8839 warn_div_by_zero(expression);
8842 static void warn_addsub_in_shift(const expression_t *const expr)
8845 switch (expr->kind) {
8846 case EXPR_BINARY_ADD: op = '+'; break;
8847 case EXPR_BINARY_SUB: op = '-'; break;
8851 warningf(&expr->base.source_position,
8852 "suggest parentheses around '%c' inside shift", op);
8855 static void semantic_shift_op(binary_expression_t *expression)
8857 expression_t *const left = expression->left;
8858 expression_t *const right = expression->right;
8859 type_t *const orig_type_left = left->base.type;
8860 type_t *const orig_type_right = right->base.type;
8861 type_t * type_left = skip_typeref(orig_type_left);
8862 type_t * type_right = skip_typeref(orig_type_right);
8864 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8865 /* TODO: improve error message */
8866 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8867 errorf(&expression->base.source_position,
8868 "operands of shift operation must have integer types");
8873 if (warning.parentheses) {
8874 warn_addsub_in_shift(left);
8875 warn_addsub_in_shift(right);
8878 type_left = promote_integer(type_left);
8879 type_right = promote_integer(type_right);
8881 expression->left = create_implicit_cast(left, type_left);
8882 expression->right = create_implicit_cast(right, type_right);
8883 expression->base.type = type_left;
8886 static void semantic_add(binary_expression_t *expression)
8888 expression_t *const left = expression->left;
8889 expression_t *const right = expression->right;
8890 type_t *const orig_type_left = left->base.type;
8891 type_t *const orig_type_right = right->base.type;
8892 type_t *const type_left = skip_typeref(orig_type_left);
8893 type_t *const type_right = skip_typeref(orig_type_right);
8896 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8897 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8898 expression->left = create_implicit_cast(left, arithmetic_type);
8899 expression->right = create_implicit_cast(right, arithmetic_type);
8900 expression->base.type = arithmetic_type;
8901 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8902 check_pointer_arithmetic(&expression->base.source_position,
8903 type_left, orig_type_left);
8904 expression->base.type = type_left;
8905 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8906 check_pointer_arithmetic(&expression->base.source_position,
8907 type_right, orig_type_right);
8908 expression->base.type = type_right;
8909 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8910 errorf(&expression->base.source_position,
8911 "invalid operands to binary + ('%T', '%T')",
8912 orig_type_left, orig_type_right);
8916 static void semantic_sub(binary_expression_t *expression)
8918 expression_t *const left = expression->left;
8919 expression_t *const right = expression->right;
8920 type_t *const orig_type_left = left->base.type;
8921 type_t *const orig_type_right = right->base.type;
8922 type_t *const type_left = skip_typeref(orig_type_left);
8923 type_t *const type_right = skip_typeref(orig_type_right);
8924 source_position_t const *const pos = &expression->base.source_position;
8927 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8928 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8929 expression->left = create_implicit_cast(left, arithmetic_type);
8930 expression->right = create_implicit_cast(right, arithmetic_type);
8931 expression->base.type = arithmetic_type;
8932 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8933 check_pointer_arithmetic(&expression->base.source_position,
8934 type_left, orig_type_left);
8935 expression->base.type = type_left;
8936 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8937 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8938 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8939 if (!types_compatible(unqual_left, unqual_right)) {
8941 "subtracting pointers to incompatible types '%T' and '%T'",
8942 orig_type_left, orig_type_right);
8943 } else if (!is_type_object(unqual_left)) {
8944 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8945 errorf(pos, "subtracting pointers to non-object types '%T'",
8947 } else if (warning.other) {
8948 warningf(pos, "subtracting pointers to void");
8951 expression->base.type = type_ptrdiff_t;
8952 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8953 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8954 orig_type_left, orig_type_right);
8958 static void warn_string_literal_address(expression_t const* expr)
8960 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8961 expr = expr->unary.value;
8962 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8964 expr = expr->unary.value;
8967 if (expr->kind == EXPR_STRING_LITERAL ||
8968 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8969 warningf(&expr->base.source_position,
8970 "comparison with string literal results in unspecified behaviour");
8974 static void warn_comparison_in_comparison(const expression_t *const expr)
8976 if (expr->base.parenthesized)
8978 switch (expr->base.kind) {
8979 case EXPR_BINARY_LESS:
8980 case EXPR_BINARY_GREATER:
8981 case EXPR_BINARY_LESSEQUAL:
8982 case EXPR_BINARY_GREATEREQUAL:
8983 case EXPR_BINARY_NOTEQUAL:
8984 case EXPR_BINARY_EQUAL:
8985 warningf(&expr->base.source_position,
8986 "comparisons like 'x <= y < z' do not have their mathematical meaning");
8994 * Check the semantics of comparison expressions.
8996 * @param expression The expression to check.
8998 static void semantic_comparison(binary_expression_t *expression)
9000 expression_t *left = expression->left;
9001 expression_t *right = expression->right;
9003 if (warning.address) {
9004 warn_string_literal_address(left);
9005 warn_string_literal_address(right);
9007 expression_t const* const func_left = get_reference_address(left);
9008 if (func_left != NULL && is_null_pointer_constant(right)) {
9009 warningf(&expression->base.source_position,
9010 "the address of '%Y' will never be NULL",
9011 func_left->reference.entity->base.symbol);
9014 expression_t const* const func_right = get_reference_address(right);
9015 if (func_right != NULL && is_null_pointer_constant(right)) {
9016 warningf(&expression->base.source_position,
9017 "the address of '%Y' will never be NULL",
9018 func_right->reference.entity->base.symbol);
9022 if (warning.parentheses) {
9023 warn_comparison_in_comparison(left);
9024 warn_comparison_in_comparison(right);
9027 type_t *orig_type_left = left->base.type;
9028 type_t *orig_type_right = right->base.type;
9029 type_t *type_left = skip_typeref(orig_type_left);
9030 type_t *type_right = skip_typeref(orig_type_right);
9032 /* TODO non-arithmetic types */
9033 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9034 /* test for signed vs unsigned compares */
9035 if (warning.sign_compare &&
9036 (expression->base.kind != EXPR_BINARY_EQUAL &&
9037 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
9038 (is_type_signed(type_left) != is_type_signed(type_right))) {
9040 /* check if 1 of the operands is a constant, in this case we just
9041 * check wether we can safely represent the resulting constant in
9042 * the type of the other operand. */
9043 expression_t *const_expr = NULL;
9044 expression_t *other_expr = NULL;
9046 if (is_constant_expression(left)) {
9049 } else if (is_constant_expression(right)) {
9054 if (const_expr != NULL) {
9055 type_t *other_type = skip_typeref(other_expr->base.type);
9056 long val = fold_constant(const_expr);
9057 /* TODO: check if val can be represented by other_type */
9061 warningf(&expression->base.source_position,
9062 "comparison between signed and unsigned");
9064 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9065 expression->left = create_implicit_cast(left, arithmetic_type);
9066 expression->right = create_implicit_cast(right, arithmetic_type);
9067 expression->base.type = arithmetic_type;
9068 if (warning.float_equal &&
9069 (expression->base.kind == EXPR_BINARY_EQUAL ||
9070 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
9071 is_type_float(arithmetic_type)) {
9072 warningf(&expression->base.source_position,
9073 "comparing floating point with == or != is unsafe");
9075 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
9076 /* TODO check compatibility */
9077 } else if (is_type_pointer(type_left)) {
9078 expression->right = create_implicit_cast(right, type_left);
9079 } else if (is_type_pointer(type_right)) {
9080 expression->left = create_implicit_cast(left, type_right);
9081 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9082 type_error_incompatible("invalid operands in comparison",
9083 &expression->base.source_position,
9084 type_left, type_right);
9086 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9090 * Checks if a compound type has constant fields.
9092 static bool has_const_fields(const compound_type_t *type)
9094 compound_t *compound = type->compound;
9095 entity_t *entry = compound->members.entities;
9097 for (; entry != NULL; entry = entry->base.next) {
9098 if (!is_declaration(entry))
9101 const type_t *decl_type = skip_typeref(entry->declaration.type);
9102 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
9109 static bool is_valid_assignment_lhs(expression_t const* const left)
9111 type_t *const orig_type_left = revert_automatic_type_conversion(left);
9112 type_t *const type_left = skip_typeref(orig_type_left);
9114 if (!is_lvalue(left)) {
9115 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
9120 if (left->kind == EXPR_REFERENCE
9121 && left->reference.entity->kind == ENTITY_FUNCTION) {
9122 errorf(HERE, "cannot assign to function '%E'", left);
9126 if (is_type_array(type_left)) {
9127 errorf(HERE, "cannot assign to array '%E'", left);
9130 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
9131 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
9135 if (is_type_incomplete(type_left)) {
9136 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
9137 left, orig_type_left);
9140 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9141 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9142 left, orig_type_left);
9149 static void semantic_arithmetic_assign(binary_expression_t *expression)
9151 expression_t *left = expression->left;
9152 expression_t *right = expression->right;
9153 type_t *orig_type_left = left->base.type;
9154 type_t *orig_type_right = right->base.type;
9156 if (!is_valid_assignment_lhs(left))
9159 type_t *type_left = skip_typeref(orig_type_left);
9160 type_t *type_right = skip_typeref(orig_type_right);
9162 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9163 /* TODO: improve error message */
9164 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9165 errorf(&expression->base.source_position,
9166 "operation needs arithmetic types");
9171 /* combined instructions are tricky. We can't create an implicit cast on
9172 * the left side, because we need the uncasted form for the store.
9173 * The ast2firm pass has to know that left_type must be right_type
9174 * for the arithmetic operation and create a cast by itself */
9175 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9176 expression->right = create_implicit_cast(right, arithmetic_type);
9177 expression->base.type = type_left;
9180 static void semantic_divmod_assign(binary_expression_t *expression)
9182 semantic_arithmetic_assign(expression);
9183 warn_div_by_zero(expression);
9186 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9188 expression_t *const left = expression->left;
9189 expression_t *const right = expression->right;
9190 type_t *const orig_type_left = left->base.type;
9191 type_t *const orig_type_right = right->base.type;
9192 type_t *const type_left = skip_typeref(orig_type_left);
9193 type_t *const type_right = skip_typeref(orig_type_right);
9195 if (!is_valid_assignment_lhs(left))
9198 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9199 /* combined instructions are tricky. We can't create an implicit cast on
9200 * the left side, because we need the uncasted form for the store.
9201 * The ast2firm pass has to know that left_type must be right_type
9202 * for the arithmetic operation and create a cast by itself */
9203 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9204 expression->right = create_implicit_cast(right, arithmetic_type);
9205 expression->base.type = type_left;
9206 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9207 check_pointer_arithmetic(&expression->base.source_position,
9208 type_left, orig_type_left);
9209 expression->base.type = type_left;
9210 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9211 errorf(&expression->base.source_position,
9212 "incompatible types '%T' and '%T' in assignment",
9213 orig_type_left, orig_type_right);
9217 static void warn_logical_and_within_or(const expression_t *const expr)
9219 if (expr->base.kind != EXPR_BINARY_LOGICAL_AND)
9221 if (expr->base.parenthesized)
9223 warningf(&expr->base.source_position,
9224 "suggest parentheses around && within ||");
9228 * Check the semantic restrictions of a logical expression.
9230 static void semantic_logical_op(binary_expression_t *expression)
9232 /* §6.5.13:2 Each of the operands shall have scalar type.
9233 * §6.5.14:2 Each of the operands shall have scalar type. */
9234 semantic_condition(expression->left, "left operand of logical operator");
9235 semantic_condition(expression->right, "right operand of logical operator");
9236 if (expression->base.kind == EXPR_BINARY_LOGICAL_OR &&
9237 warning.parentheses) {
9238 warn_logical_and_within_or(expression->left);
9239 warn_logical_and_within_or(expression->right);
9241 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9245 * Check the semantic restrictions of a binary assign expression.
9247 static void semantic_binexpr_assign(binary_expression_t *expression)
9249 expression_t *left = expression->left;
9250 type_t *orig_type_left = left->base.type;
9252 if (!is_valid_assignment_lhs(left))
9255 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9256 report_assign_error(error, orig_type_left, expression->right,
9257 "assignment", &left->base.source_position);
9258 expression->right = create_implicit_cast(expression->right, orig_type_left);
9259 expression->base.type = orig_type_left;
9263 * Determine if the outermost operation (or parts thereof) of the given
9264 * expression has no effect in order to generate a warning about this fact.
9265 * Therefore in some cases this only examines some of the operands of the
9266 * expression (see comments in the function and examples below).
9268 * f() + 23; // warning, because + has no effect
9269 * x || f(); // no warning, because x controls execution of f()
9270 * x ? y : f(); // warning, because y has no effect
9271 * (void)x; // no warning to be able to suppress the warning
9272 * This function can NOT be used for an "expression has definitely no effect"-
9274 static bool expression_has_effect(const expression_t *const expr)
9276 switch (expr->kind) {
9277 case EXPR_UNKNOWN: break;
9278 case EXPR_INVALID: return true; /* do NOT warn */
9279 case EXPR_REFERENCE: return false;
9280 case EXPR_REFERENCE_ENUM_VALUE: return false;
9281 /* suppress the warning for microsoft __noop operations */
9282 case EXPR_CONST: return expr->conste.is_ms_noop;
9283 case EXPR_CHARACTER_CONSTANT: return false;
9284 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9285 case EXPR_STRING_LITERAL: return false;
9286 case EXPR_WIDE_STRING_LITERAL: return false;
9287 case EXPR_LABEL_ADDRESS: return false;
9290 const call_expression_t *const call = &expr->call;
9291 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9294 switch (call->function->builtin_symbol.symbol->ID) {
9295 case T___builtin_va_end: return true;
9296 default: return false;
9300 /* Generate the warning if either the left or right hand side of a
9301 * conditional expression has no effect */
9302 case EXPR_CONDITIONAL: {
9303 const conditional_expression_t *const cond = &expr->conditional;
9305 expression_has_effect(cond->true_expression) &&
9306 expression_has_effect(cond->false_expression);
9309 case EXPR_SELECT: return false;
9310 case EXPR_ARRAY_ACCESS: return false;
9311 case EXPR_SIZEOF: return false;
9312 case EXPR_CLASSIFY_TYPE: return false;
9313 case EXPR_ALIGNOF: return false;
9315 case EXPR_FUNCNAME: return false;
9316 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9317 case EXPR_BUILTIN_CONSTANT_P: return false;
9318 case EXPR_BUILTIN_PREFETCH: return true;
9319 case EXPR_OFFSETOF: return false;
9320 case EXPR_VA_START: return true;
9321 case EXPR_VA_ARG: return true;
9322 case EXPR_STATEMENT: return true; // TODO
9323 case EXPR_COMPOUND_LITERAL: return false;
9325 case EXPR_UNARY_NEGATE: return false;
9326 case EXPR_UNARY_PLUS: return false;
9327 case EXPR_UNARY_BITWISE_NEGATE: return false;
9328 case EXPR_UNARY_NOT: return false;
9329 case EXPR_UNARY_DEREFERENCE: return false;
9330 case EXPR_UNARY_TAKE_ADDRESS: return false;
9331 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9332 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9333 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9334 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9336 /* Treat void casts as if they have an effect in order to being able to
9337 * suppress the warning */
9338 case EXPR_UNARY_CAST: {
9339 type_t *const type = skip_typeref(expr->base.type);
9340 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9343 case EXPR_UNARY_CAST_IMPLICIT: return true;
9344 case EXPR_UNARY_ASSUME: return true;
9345 case EXPR_UNARY_DELETE: return true;
9346 case EXPR_UNARY_DELETE_ARRAY: return true;
9347 case EXPR_UNARY_THROW: return true;
9349 case EXPR_BINARY_ADD: return false;
9350 case EXPR_BINARY_SUB: return false;
9351 case EXPR_BINARY_MUL: return false;
9352 case EXPR_BINARY_DIV: return false;
9353 case EXPR_BINARY_MOD: return false;
9354 case EXPR_BINARY_EQUAL: return false;
9355 case EXPR_BINARY_NOTEQUAL: return false;
9356 case EXPR_BINARY_LESS: return false;
9357 case EXPR_BINARY_LESSEQUAL: return false;
9358 case EXPR_BINARY_GREATER: return false;
9359 case EXPR_BINARY_GREATEREQUAL: return false;
9360 case EXPR_BINARY_BITWISE_AND: return false;
9361 case EXPR_BINARY_BITWISE_OR: return false;
9362 case EXPR_BINARY_BITWISE_XOR: return false;
9363 case EXPR_BINARY_SHIFTLEFT: return false;
9364 case EXPR_BINARY_SHIFTRIGHT: return false;
9365 case EXPR_BINARY_ASSIGN: return true;
9366 case EXPR_BINARY_MUL_ASSIGN: return true;
9367 case EXPR_BINARY_DIV_ASSIGN: return true;
9368 case EXPR_BINARY_MOD_ASSIGN: return true;
9369 case EXPR_BINARY_ADD_ASSIGN: return true;
9370 case EXPR_BINARY_SUB_ASSIGN: return true;
9371 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9372 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9373 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9374 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9375 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9377 /* Only examine the right hand side of && and ||, because the left hand
9378 * side already has the effect of controlling the execution of the right
9380 case EXPR_BINARY_LOGICAL_AND:
9381 case EXPR_BINARY_LOGICAL_OR:
9382 /* Only examine the right hand side of a comma expression, because the left
9383 * hand side has a separate warning */
9384 case EXPR_BINARY_COMMA:
9385 return expression_has_effect(expr->binary.right);
9387 case EXPR_BINARY_ISGREATER: return false;
9388 case EXPR_BINARY_ISGREATEREQUAL: return false;
9389 case EXPR_BINARY_ISLESS: return false;
9390 case EXPR_BINARY_ISLESSEQUAL: return false;
9391 case EXPR_BINARY_ISLESSGREATER: return false;
9392 case EXPR_BINARY_ISUNORDERED: return false;
9395 internal_errorf(HERE, "unexpected expression");
9398 static void semantic_comma(binary_expression_t *expression)
9400 if (warning.unused_value) {
9401 const expression_t *const left = expression->left;
9402 if (!expression_has_effect(left)) {
9403 warningf(&left->base.source_position,
9404 "left-hand operand of comma expression has no effect");
9407 expression->base.type = expression->right->base.type;
9411 * @param prec_r precedence of the right operand
9413 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9414 static expression_t *parse_##binexpression_type(expression_t *left) \
9416 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9417 binexpr->binary.left = left; \
9420 expression_t *right = parse_sub_expression(prec_r); \
9422 binexpr->binary.right = right; \
9423 sfunc(&binexpr->binary); \
9428 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9429 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9430 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9431 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9432 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9433 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9434 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9435 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9436 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9437 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9438 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9439 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9440 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9441 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9442 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9443 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9444 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9445 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9446 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9447 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9448 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9449 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9450 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9451 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9452 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9453 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9454 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9455 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9456 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9457 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9460 static expression_t *parse_sub_expression(precedence_t precedence)
9462 if (token.type < 0) {
9463 return expected_expression_error();
9466 expression_parser_function_t *parser
9467 = &expression_parsers[token.type];
9468 source_position_t source_position = token.source_position;
9471 if (parser->parser != NULL) {
9472 left = parser->parser();
9474 left = parse_primary_expression();
9476 assert(left != NULL);
9477 left->base.source_position = source_position;
9480 if (token.type < 0) {
9481 return expected_expression_error();
9484 parser = &expression_parsers[token.type];
9485 if (parser->infix_parser == NULL)
9487 if (parser->infix_precedence < precedence)
9490 left = parser->infix_parser(left);
9492 assert(left != NULL);
9493 assert(left->kind != EXPR_UNKNOWN);
9494 left->base.source_position = source_position;
9501 * Parse an expression.
9503 static expression_t *parse_expression(void)
9505 return parse_sub_expression(PREC_EXPRESSION);
9509 * Register a parser for a prefix-like operator.
9511 * @param parser the parser function
9512 * @param token_type the token type of the prefix token
9514 static void register_expression_parser(parse_expression_function parser,
9517 expression_parser_function_t *entry = &expression_parsers[token_type];
9519 if (entry->parser != NULL) {
9520 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9521 panic("trying to register multiple expression parsers for a token");
9523 entry->parser = parser;
9527 * Register a parser for an infix operator with given precedence.
9529 * @param parser the parser function
9530 * @param token_type the token type of the infix operator
9531 * @param precedence the precedence of the operator
9533 static void register_infix_parser(parse_expression_infix_function parser,
9534 int token_type, unsigned precedence)
9536 expression_parser_function_t *entry = &expression_parsers[token_type];
9538 if (entry->infix_parser != NULL) {
9539 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9540 panic("trying to register multiple infix expression parsers for a "
9543 entry->infix_parser = parser;
9544 entry->infix_precedence = precedence;
9548 * Initialize the expression parsers.
9550 static void init_expression_parsers(void)
9552 memset(&expression_parsers, 0, sizeof(expression_parsers));
9554 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9555 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9556 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9557 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9558 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9559 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9560 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9561 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9562 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9563 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9564 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9565 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9566 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9567 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9568 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9569 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9570 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9571 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9572 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9573 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9574 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9575 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9576 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9577 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9578 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9579 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9580 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9581 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9582 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9583 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9584 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9585 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9586 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9587 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9588 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9589 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9590 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9592 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9593 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9594 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9595 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9596 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9597 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9598 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9599 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9600 register_expression_parser(parse_sizeof, T_sizeof);
9601 register_expression_parser(parse_alignof, T___alignof__);
9602 register_expression_parser(parse_extension, T___extension__);
9603 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9604 register_expression_parser(parse_delete, T_delete);
9605 register_expression_parser(parse_throw, T_throw);
9609 * Parse a asm statement arguments specification.
9611 static asm_argument_t *parse_asm_arguments(bool is_out)
9613 asm_argument_t *result = NULL;
9614 asm_argument_t **anchor = &result;
9616 while (token.type == T_STRING_LITERAL || token.type == '[') {
9617 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9618 memset(argument, 0, sizeof(argument[0]));
9620 if (token.type == '[') {
9622 if (token.type != T_IDENTIFIER) {
9623 parse_error_expected("while parsing asm argument",
9624 T_IDENTIFIER, NULL);
9627 argument->symbol = token.v.symbol;
9629 expect(']', end_error);
9632 argument->constraints = parse_string_literals();
9633 expect('(', end_error);
9634 add_anchor_token(')');
9635 expression_t *expression = parse_expression();
9636 rem_anchor_token(')');
9638 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9639 * change size or type representation (e.g. int -> long is ok, but
9640 * int -> float is not) */
9641 if (expression->kind == EXPR_UNARY_CAST) {
9642 type_t *const type = expression->base.type;
9643 type_kind_t const kind = type->kind;
9644 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9647 if (kind == TYPE_ATOMIC) {
9648 atomic_type_kind_t const akind = type->atomic.akind;
9649 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9650 size = get_atomic_type_size(akind);
9652 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9653 size = get_atomic_type_size(get_intptr_kind());
9657 expression_t *const value = expression->unary.value;
9658 type_t *const value_type = value->base.type;
9659 type_kind_t const value_kind = value_type->kind;
9661 unsigned value_flags;
9662 unsigned value_size;
9663 if (value_kind == TYPE_ATOMIC) {
9664 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9665 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9666 value_size = get_atomic_type_size(value_akind);
9667 } else if (value_kind == TYPE_POINTER) {
9668 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9669 value_size = get_atomic_type_size(get_intptr_kind());
9674 if (value_flags != flags || value_size != size)
9678 } while (expression->kind == EXPR_UNARY_CAST);
9682 if (!is_lvalue(expression)) {
9683 errorf(&expression->base.source_position,
9684 "asm output argument is not an lvalue");
9687 if (argument->constraints.begin[0] == '+')
9688 mark_vars_read(expression, NULL);
9690 mark_vars_read(expression, NULL);
9692 argument->expression = expression;
9693 expect(')', end_error);
9695 set_address_taken(expression, true);
9698 anchor = &argument->next;
9700 if (token.type != ',')
9711 * Parse a asm statement clobber specification.
9713 static asm_clobber_t *parse_asm_clobbers(void)
9715 asm_clobber_t *result = NULL;
9716 asm_clobber_t *last = NULL;
9718 while (token.type == T_STRING_LITERAL) {
9719 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9720 clobber->clobber = parse_string_literals();
9723 last->next = clobber;
9729 if (token.type != ',')
9738 * Parse an asm statement.
9740 static statement_t *parse_asm_statement(void)
9742 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9743 asm_statement_t *asm_statement = &statement->asms;
9747 if (token.type == T_volatile) {
9749 asm_statement->is_volatile = true;
9752 expect('(', end_error);
9753 add_anchor_token(')');
9754 add_anchor_token(':');
9755 asm_statement->asm_text = parse_string_literals();
9757 if (token.type != ':') {
9758 rem_anchor_token(':');
9763 asm_statement->outputs = parse_asm_arguments(true);
9764 if (token.type != ':') {
9765 rem_anchor_token(':');
9770 asm_statement->inputs = parse_asm_arguments(false);
9771 if (token.type != ':') {
9772 rem_anchor_token(':');
9775 rem_anchor_token(':');
9778 asm_statement->clobbers = parse_asm_clobbers();
9781 rem_anchor_token(')');
9782 expect(')', end_error);
9783 expect(';', end_error);
9785 if (asm_statement->outputs == NULL) {
9786 /* GCC: An 'asm' instruction without any output operands will be treated
9787 * identically to a volatile 'asm' instruction. */
9788 asm_statement->is_volatile = true;
9793 return create_invalid_statement();
9797 * Parse a case statement.
9799 static statement_t *parse_case_statement(void)
9801 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9802 source_position_t *const pos = &statement->base.source_position;
9806 expression_t *const expression = parse_expression();
9807 statement->case_label.expression = expression;
9808 if (!is_constant_expression(expression)) {
9809 /* This check does not prevent the error message in all cases of an
9810 * prior error while parsing the expression. At least it catches the
9811 * common case of a mistyped enum entry. */
9812 if (is_type_valid(skip_typeref(expression->base.type))) {
9813 errorf(pos, "case label does not reduce to an integer constant");
9815 statement->case_label.is_bad = true;
9817 long const val = fold_constant(expression);
9818 statement->case_label.first_case = val;
9819 statement->case_label.last_case = val;
9823 if (token.type == T_DOTDOTDOT) {
9825 expression_t *const end_range = parse_expression();
9826 statement->case_label.end_range = end_range;
9827 if (!is_constant_expression(end_range)) {
9828 /* This check does not prevent the error message in all cases of an
9829 * prior error while parsing the expression. At least it catches the
9830 * common case of a mistyped enum entry. */
9831 if (is_type_valid(skip_typeref(end_range->base.type))) {
9832 errorf(pos, "case range does not reduce to an integer constant");
9834 statement->case_label.is_bad = true;
9836 long const val = fold_constant(end_range);
9837 statement->case_label.last_case = val;
9839 if (warning.other && val < statement->case_label.first_case) {
9840 statement->case_label.is_empty_range = true;
9841 warningf(pos, "empty range specified");
9847 PUSH_PARENT(statement);
9849 expect(':', end_error);
9852 if (current_switch != NULL) {
9853 if (! statement->case_label.is_bad) {
9854 /* Check for duplicate case values */
9855 case_label_statement_t *c = &statement->case_label;
9856 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9857 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9860 if (c->last_case < l->first_case || c->first_case > l->last_case)
9863 errorf(pos, "duplicate case value (previously used %P)",
9864 &l->base.source_position);
9868 /* link all cases into the switch statement */
9869 if (current_switch->last_case == NULL) {
9870 current_switch->first_case = &statement->case_label;
9872 current_switch->last_case->next = &statement->case_label;
9874 current_switch->last_case = &statement->case_label;
9876 errorf(pos, "case label not within a switch statement");
9879 statement_t *const inner_stmt = parse_statement();
9880 statement->case_label.statement = inner_stmt;
9881 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9882 errorf(&inner_stmt->base.source_position, "declaration after case label");
9890 * Parse a default statement.
9892 static statement_t *parse_default_statement(void)
9894 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9898 PUSH_PARENT(statement);
9900 expect(':', end_error);
9901 if (current_switch != NULL) {
9902 const case_label_statement_t *def_label = current_switch->default_label;
9903 if (def_label != NULL) {
9904 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9905 &def_label->base.source_position);
9907 current_switch->default_label = &statement->case_label;
9909 /* link all cases into the switch statement */
9910 if (current_switch->last_case == NULL) {
9911 current_switch->first_case = &statement->case_label;
9913 current_switch->last_case->next = &statement->case_label;
9915 current_switch->last_case = &statement->case_label;
9918 errorf(&statement->base.source_position,
9919 "'default' label not within a switch statement");
9922 statement_t *const inner_stmt = parse_statement();
9923 statement->case_label.statement = inner_stmt;
9924 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9925 errorf(&inner_stmt->base.source_position, "declaration after default label");
9932 return create_invalid_statement();
9936 * Parse a label statement.
9938 static statement_t *parse_label_statement(void)
9940 assert(token.type == T_IDENTIFIER);
9941 symbol_t *symbol = token.v.symbol;
9942 label_t *label = get_label(symbol);
9944 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9945 statement->label.label = label;
9949 PUSH_PARENT(statement);
9951 /* if statement is already set then the label is defined twice,
9952 * otherwise it was just mentioned in a goto/local label declaration so far
9954 if (label->statement != NULL) {
9955 errorf(HERE, "duplicate label '%Y' (declared %P)",
9956 symbol, &label->base.source_position);
9958 label->base.source_position = token.source_position;
9959 label->statement = statement;
9964 if (token.type == '}') {
9965 /* TODO only warn? */
9966 if (warning.other && false) {
9967 warningf(HERE, "label at end of compound statement");
9968 statement->label.statement = create_empty_statement();
9970 errorf(HERE, "label at end of compound statement");
9971 statement->label.statement = create_invalid_statement();
9973 } else if (token.type == ';') {
9974 /* Eat an empty statement here, to avoid the warning about an empty
9975 * statement after a label. label:; is commonly used to have a label
9976 * before a closing brace. */
9977 statement->label.statement = create_empty_statement();
9980 statement_t *const inner_stmt = parse_statement();
9981 statement->label.statement = inner_stmt;
9982 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9983 errorf(&inner_stmt->base.source_position, "declaration after label");
9987 /* remember the labels in a list for later checking */
9988 *label_anchor = &statement->label;
9989 label_anchor = &statement->label.next;
9996 * Parse an if statement.
9998 static statement_t *parse_if(void)
10000 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
10004 PUSH_PARENT(statement);
10006 add_anchor_token('{');
10008 expect('(', end_error);
10009 add_anchor_token(')');
10010 expression_t *const expr = parse_expression();
10011 statement->ifs.condition = expr;
10012 /* §6.8.4.1:1 The controlling expression of an if statement shall have
10014 semantic_condition(expr, "condition of 'if'-statment");
10015 mark_vars_read(expr, NULL);
10016 rem_anchor_token(')');
10017 expect(')', end_error);
10020 rem_anchor_token('{');
10022 add_anchor_token(T_else);
10023 statement_t *const true_stmt = parse_statement();
10024 statement->ifs.true_statement = true_stmt;
10025 rem_anchor_token(T_else);
10027 if (token.type == T_else) {
10029 statement->ifs.false_statement = parse_statement();
10030 } else if (warning.parentheses &&
10031 true_stmt->kind == STATEMENT_IF &&
10032 true_stmt->ifs.false_statement != NULL) {
10033 warningf(&true_stmt->base.source_position,
10034 "suggest explicit braces to avoid ambiguous 'else'");
10042 * Check that all enums are handled in a switch.
10044 * @param statement the switch statement to check
10046 static void check_enum_cases(const switch_statement_t *statement) {
10047 const type_t *type = skip_typeref(statement->expression->base.type);
10048 if (! is_type_enum(type))
10050 const enum_type_t *enumt = &type->enumt;
10052 /* if we have a default, no warnings */
10053 if (statement->default_label != NULL)
10056 /* FIXME: calculation of value should be done while parsing */
10057 /* TODO: quadratic algorithm here. Change to an n log n one */
10058 long last_value = -1;
10059 const entity_t *entry = enumt->enume->base.next;
10060 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
10061 entry = entry->base.next) {
10062 const expression_t *expression = entry->enum_value.value;
10063 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
10064 bool found = false;
10065 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
10066 if (l->expression == NULL)
10068 if (l->first_case <= value && value <= l->last_case) {
10074 warningf(&statement->base.source_position,
10075 "enumeration value '%Y' not handled in switch",
10076 entry->base.symbol);
10078 last_value = value;
10083 * Parse a switch statement.
10085 static statement_t *parse_switch(void)
10087 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
10091 PUSH_PARENT(statement);
10093 expect('(', end_error);
10094 add_anchor_token(')');
10095 expression_t *const expr = parse_expression();
10096 mark_vars_read(expr, NULL);
10097 type_t * type = skip_typeref(expr->base.type);
10098 if (is_type_integer(type)) {
10099 type = promote_integer(type);
10100 if (warning.traditional) {
10101 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
10102 warningf(&expr->base.source_position,
10103 "'%T' switch expression not converted to '%T' in ISO C",
10107 } else if (is_type_valid(type)) {
10108 errorf(&expr->base.source_position,
10109 "switch quantity is not an integer, but '%T'", type);
10110 type = type_error_type;
10112 statement->switchs.expression = create_implicit_cast(expr, type);
10113 expect(')', end_error);
10114 rem_anchor_token(')');
10116 switch_statement_t *rem = current_switch;
10117 current_switch = &statement->switchs;
10118 statement->switchs.body = parse_statement();
10119 current_switch = rem;
10121 if (warning.switch_default &&
10122 statement->switchs.default_label == NULL) {
10123 warningf(&statement->base.source_position, "switch has no default case");
10125 if (warning.switch_enum)
10126 check_enum_cases(&statement->switchs);
10132 return create_invalid_statement();
10135 static statement_t *parse_loop_body(statement_t *const loop)
10137 statement_t *const rem = current_loop;
10138 current_loop = loop;
10140 statement_t *const body = parse_statement();
10142 current_loop = rem;
10147 * Parse a while statement.
10149 static statement_t *parse_while(void)
10151 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
10155 PUSH_PARENT(statement);
10157 expect('(', end_error);
10158 add_anchor_token(')');
10159 expression_t *const cond = parse_expression();
10160 statement->whiles.condition = cond;
10161 /* §6.8.5:2 The controlling expression of an iteration statement shall
10162 * have scalar type. */
10163 semantic_condition(cond, "condition of 'while'-statement");
10164 mark_vars_read(cond, NULL);
10165 rem_anchor_token(')');
10166 expect(')', end_error);
10168 statement->whiles.body = parse_loop_body(statement);
10174 return create_invalid_statement();
10178 * Parse a do statement.
10180 static statement_t *parse_do(void)
10182 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10186 PUSH_PARENT(statement);
10188 add_anchor_token(T_while);
10189 statement->do_while.body = parse_loop_body(statement);
10190 rem_anchor_token(T_while);
10192 expect(T_while, end_error);
10193 expect('(', end_error);
10194 add_anchor_token(')');
10195 expression_t *const cond = parse_expression();
10196 statement->do_while.condition = cond;
10197 /* §6.8.5:2 The controlling expression of an iteration statement shall
10198 * have scalar type. */
10199 semantic_condition(cond, "condition of 'do-while'-statement");
10200 mark_vars_read(cond, NULL);
10201 rem_anchor_token(')');
10202 expect(')', end_error);
10203 expect(';', end_error);
10209 return create_invalid_statement();
10213 * Parse a for statement.
10215 static statement_t *parse_for(void)
10217 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10221 expect('(', end_error1);
10222 add_anchor_token(')');
10224 PUSH_PARENT(statement);
10226 size_t const top = environment_top();
10227 scope_t *old_scope = scope_push(&statement->fors.scope);
10229 if (token.type == ';') {
10231 } else if (is_declaration_specifier(&token, false)) {
10232 parse_declaration(record_entity, DECL_FLAGS_NONE);
10234 add_anchor_token(';');
10235 expression_t *const init = parse_expression();
10236 statement->fors.initialisation = init;
10237 mark_vars_read(init, ENT_ANY);
10238 if (warning.unused_value && !expression_has_effect(init)) {
10239 warningf(&init->base.source_position,
10240 "initialisation of 'for'-statement has no effect");
10242 rem_anchor_token(';');
10243 expect(';', end_error2);
10246 if (token.type != ';') {
10247 add_anchor_token(';');
10248 expression_t *const cond = parse_expression();
10249 statement->fors.condition = cond;
10250 /* §6.8.5:2 The controlling expression of an iteration statement
10251 * shall have scalar type. */
10252 semantic_condition(cond, "condition of 'for'-statement");
10253 mark_vars_read(cond, NULL);
10254 rem_anchor_token(';');
10256 expect(';', end_error2);
10257 if (token.type != ')') {
10258 expression_t *const step = parse_expression();
10259 statement->fors.step = step;
10260 mark_vars_read(step, ENT_ANY);
10261 if (warning.unused_value && !expression_has_effect(step)) {
10262 warningf(&step->base.source_position,
10263 "step of 'for'-statement has no effect");
10266 expect(')', end_error2);
10267 rem_anchor_token(')');
10268 statement->fors.body = parse_loop_body(statement);
10270 assert(current_scope == &statement->fors.scope);
10271 scope_pop(old_scope);
10272 environment_pop_to(top);
10279 rem_anchor_token(')');
10280 assert(current_scope == &statement->fors.scope);
10281 scope_pop(old_scope);
10282 environment_pop_to(top);
10286 return create_invalid_statement();
10290 * Parse a goto statement.
10292 static statement_t *parse_goto(void)
10294 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10297 if (GNU_MODE && token.type == '*') {
10299 expression_t *expression = parse_expression();
10300 mark_vars_read(expression, NULL);
10302 /* Argh: although documentation says the expression must be of type void*,
10303 * gcc accepts anything that can be casted into void* without error */
10304 type_t *type = expression->base.type;
10306 if (type != type_error_type) {
10307 if (!is_type_pointer(type) && !is_type_integer(type)) {
10308 errorf(&expression->base.source_position,
10309 "cannot convert to a pointer type");
10310 } else if (warning.other && type != type_void_ptr) {
10311 warningf(&expression->base.source_position,
10312 "type of computed goto expression should be 'void*' not '%T'", type);
10314 expression = create_implicit_cast(expression, type_void_ptr);
10317 statement->gotos.expression = expression;
10319 if (token.type != T_IDENTIFIER) {
10321 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10323 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10324 eat_until_anchor();
10327 symbol_t *symbol = token.v.symbol;
10330 statement->gotos.label = get_label(symbol);
10333 /* remember the goto's in a list for later checking */
10334 *goto_anchor = &statement->gotos;
10335 goto_anchor = &statement->gotos.next;
10337 expect(';', end_error);
10341 return create_invalid_statement();
10345 * Parse a continue statement.
10347 static statement_t *parse_continue(void)
10349 if (current_loop == NULL) {
10350 errorf(HERE, "continue statement not within loop");
10353 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10356 expect(';', end_error);
10363 * Parse a break statement.
10365 static statement_t *parse_break(void)
10367 if (current_switch == NULL && current_loop == NULL) {
10368 errorf(HERE, "break statement not within loop or switch");
10371 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10374 expect(';', end_error);
10381 * Parse a __leave statement.
10383 static statement_t *parse_leave_statement(void)
10385 if (current_try == NULL) {
10386 errorf(HERE, "__leave statement not within __try");
10389 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10392 expect(';', end_error);
10399 * Check if a given entity represents a local variable.
10401 static bool is_local_variable(const entity_t *entity)
10403 if (entity->kind != ENTITY_VARIABLE)
10406 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10407 case STORAGE_CLASS_AUTO:
10408 case STORAGE_CLASS_REGISTER: {
10409 const type_t *type = skip_typeref(entity->declaration.type);
10410 if (is_type_function(type)) {
10422 * Check if a given expression represents a local variable.
10424 static bool expression_is_local_variable(const expression_t *expression)
10426 if (expression->base.kind != EXPR_REFERENCE) {
10429 const entity_t *entity = expression->reference.entity;
10430 return is_local_variable(entity);
10434 * Check if a given expression represents a local variable and
10435 * return its declaration then, else return NULL.
10437 entity_t *expression_is_variable(const expression_t *expression)
10439 if (expression->base.kind != EXPR_REFERENCE) {
10442 entity_t *entity = expression->reference.entity;
10443 if (entity->kind != ENTITY_VARIABLE)
10450 * Parse a return statement.
10452 static statement_t *parse_return(void)
10456 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10458 expression_t *return_value = NULL;
10459 if (token.type != ';') {
10460 return_value = parse_expression();
10461 mark_vars_read(return_value, NULL);
10464 const type_t *const func_type = skip_typeref(current_function->base.type);
10465 assert(is_type_function(func_type));
10466 type_t *const return_type = skip_typeref(func_type->function.return_type);
10468 source_position_t const *const pos = &statement->base.source_position;
10469 if (return_value != NULL) {
10470 type_t *return_value_type = skip_typeref(return_value->base.type);
10472 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10473 if (is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10474 /* ISO/IEC 14882:1998(E) §6.6.3:2 */
10475 /* Only warn in C mode, because GCC does the same */
10476 if (c_mode & _CXX || strict_mode) {
10478 "'return' with a value, in function returning 'void'");
10479 } else if (warning.other) {
10481 "'return' with a value, in function returning 'void'");
10483 } else if (!(c_mode & _CXX)) { /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10484 /* Only warn in C mode, because GCC does the same */
10487 "'return' with expression in function return 'void'");
10488 } else if (warning.other) {
10490 "'return' with expression in function return 'void'");
10494 assign_error_t error = semantic_assign(return_type, return_value);
10495 report_assign_error(error, return_type, return_value, "'return'",
10498 return_value = create_implicit_cast(return_value, return_type);
10499 /* check for returning address of a local var */
10500 if (warning.other && return_value != NULL
10501 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10502 const expression_t *expression = return_value->unary.value;
10503 if (expression_is_local_variable(expression)) {
10504 warningf(pos, "function returns address of local variable");
10507 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10508 /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10509 if (c_mode & _CXX || strict_mode) {
10511 "'return' without value, in function returning non-void");
10514 "'return' without value, in function returning non-void");
10517 statement->returns.value = return_value;
10519 expect(';', end_error);
10526 * Parse a declaration statement.
10528 static statement_t *parse_declaration_statement(void)
10530 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10532 entity_t *before = current_scope->last_entity;
10534 parse_external_declaration();
10536 parse_declaration(record_entity, DECL_FLAGS_NONE);
10539 if (before == NULL) {
10540 statement->declaration.declarations_begin = current_scope->entities;
10542 statement->declaration.declarations_begin = before->base.next;
10544 statement->declaration.declarations_end = current_scope->last_entity;
10550 * Parse an expression statement, ie. expr ';'.
10552 static statement_t *parse_expression_statement(void)
10554 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10556 expression_t *const expr = parse_expression();
10557 statement->expression.expression = expr;
10558 mark_vars_read(expr, ENT_ANY);
10560 expect(';', end_error);
10567 * Parse a microsoft __try { } __finally { } or
10568 * __try{ } __except() { }
10570 static statement_t *parse_ms_try_statment(void)
10572 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10575 PUSH_PARENT(statement);
10577 ms_try_statement_t *rem = current_try;
10578 current_try = &statement->ms_try;
10579 statement->ms_try.try_statement = parse_compound_statement(false);
10584 if (token.type == T___except) {
10586 expect('(', end_error);
10587 add_anchor_token(')');
10588 expression_t *const expr = parse_expression();
10589 mark_vars_read(expr, NULL);
10590 type_t * type = skip_typeref(expr->base.type);
10591 if (is_type_integer(type)) {
10592 type = promote_integer(type);
10593 } else if (is_type_valid(type)) {
10594 errorf(&expr->base.source_position,
10595 "__expect expression is not an integer, but '%T'", type);
10596 type = type_error_type;
10598 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10599 rem_anchor_token(')');
10600 expect(')', end_error);
10601 statement->ms_try.final_statement = parse_compound_statement(false);
10602 } else if (token.type == T__finally) {
10604 statement->ms_try.final_statement = parse_compound_statement(false);
10606 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10607 return create_invalid_statement();
10611 return create_invalid_statement();
10614 static statement_t *parse_empty_statement(void)
10616 if (warning.empty_statement) {
10617 warningf(HERE, "statement is empty");
10619 statement_t *const statement = create_empty_statement();
10624 static statement_t *parse_local_label_declaration(void)
10626 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10630 entity_t *begin = NULL, *end = NULL;
10633 if (token.type != T_IDENTIFIER) {
10634 parse_error_expected("while parsing local label declaration",
10635 T_IDENTIFIER, NULL);
10638 symbol_t *symbol = token.v.symbol;
10639 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10640 if (entity != NULL && entity->base.parent_scope == current_scope) {
10641 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10642 symbol, &entity->base.source_position);
10644 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10646 entity->base.parent_scope = current_scope;
10647 entity->base.namespc = NAMESPACE_LABEL;
10648 entity->base.source_position = token.source_position;
10649 entity->base.symbol = symbol;
10652 end->base.next = entity;
10657 environment_push(entity);
10661 if (token.type != ',')
10667 statement->declaration.declarations_begin = begin;
10668 statement->declaration.declarations_end = end;
10672 static void parse_namespace_definition(void)
10676 entity_t *entity = NULL;
10677 symbol_t *symbol = NULL;
10679 if (token.type == T_IDENTIFIER) {
10680 symbol = token.v.symbol;
10683 entity = get_entity(symbol, NAMESPACE_NORMAL);
10684 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10685 && entity->base.parent_scope == current_scope) {
10686 error_redefined_as_different_kind(&token.source_position,
10687 entity, ENTITY_NAMESPACE);
10692 if (entity == NULL) {
10693 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10694 entity->base.symbol = symbol;
10695 entity->base.source_position = token.source_position;
10696 entity->base.namespc = NAMESPACE_NORMAL;
10697 entity->base.parent_scope = current_scope;
10700 if (token.type == '=') {
10701 /* TODO: parse namespace alias */
10702 panic("namespace alias definition not supported yet");
10705 environment_push(entity);
10706 append_entity(current_scope, entity);
10708 size_t const top = environment_top();
10709 scope_t *old_scope = scope_push(&entity->namespacee.members);
10711 expect('{', end_error);
10713 expect('}', end_error);
10716 assert(current_scope == &entity->namespacee.members);
10717 scope_pop(old_scope);
10718 environment_pop_to(top);
10722 * Parse a statement.
10723 * There's also parse_statement() which additionally checks for
10724 * "statement has no effect" warnings
10726 static statement_t *intern_parse_statement(void)
10728 statement_t *statement = NULL;
10730 /* declaration or statement */
10731 add_anchor_token(';');
10732 switch (token.type) {
10733 case T_IDENTIFIER: {
10734 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10735 if (la1_type == ':') {
10736 statement = parse_label_statement();
10737 } else if (is_typedef_symbol(token.v.symbol)) {
10738 statement = parse_declaration_statement();
10740 /* it's an identifier, the grammar says this must be an
10741 * expression statement. However it is common that users mistype
10742 * declaration types, so we guess a bit here to improve robustness
10743 * for incorrect programs */
10744 switch (la1_type) {
10747 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10748 goto expression_statment;
10753 statement = parse_declaration_statement();
10757 expression_statment:
10758 statement = parse_expression_statement();
10765 case T___extension__:
10766 /* This can be a prefix to a declaration or an expression statement.
10767 * We simply eat it now and parse the rest with tail recursion. */
10770 } while (token.type == T___extension__);
10771 bool old_gcc_extension = in_gcc_extension;
10772 in_gcc_extension = true;
10773 statement = intern_parse_statement();
10774 in_gcc_extension = old_gcc_extension;
10778 statement = parse_declaration_statement();
10782 statement = parse_local_label_declaration();
10785 case ';': statement = parse_empty_statement(); break;
10786 case '{': statement = parse_compound_statement(false); break;
10787 case T___leave: statement = parse_leave_statement(); break;
10788 case T___try: statement = parse_ms_try_statment(); break;
10789 case T_asm: statement = parse_asm_statement(); break;
10790 case T_break: statement = parse_break(); break;
10791 case T_case: statement = parse_case_statement(); break;
10792 case T_continue: statement = parse_continue(); break;
10793 case T_default: statement = parse_default_statement(); break;
10794 case T_do: statement = parse_do(); break;
10795 case T_for: statement = parse_for(); break;
10796 case T_goto: statement = parse_goto(); break;
10797 case T_if: statement = parse_if(); break;
10798 case T_return: statement = parse_return(); break;
10799 case T_switch: statement = parse_switch(); break;
10800 case T_while: statement = parse_while(); break;
10803 statement = parse_expression_statement();
10807 errorf(HERE, "unexpected token %K while parsing statement", &token);
10808 statement = create_invalid_statement();
10813 rem_anchor_token(';');
10815 assert(statement != NULL
10816 && statement->base.source_position.input_name != NULL);
10822 * parse a statement and emits "statement has no effect" warning if needed
10823 * (This is really a wrapper around intern_parse_statement with check for 1
10824 * single warning. It is needed, because for statement expressions we have
10825 * to avoid the warning on the last statement)
10827 static statement_t *parse_statement(void)
10829 statement_t *statement = intern_parse_statement();
10831 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10832 expression_t *expression = statement->expression.expression;
10833 if (!expression_has_effect(expression)) {
10834 warningf(&expression->base.source_position,
10835 "statement has no effect");
10843 * Parse a compound statement.
10845 static statement_t *parse_compound_statement(bool inside_expression_statement)
10847 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10849 PUSH_PARENT(statement);
10852 add_anchor_token('}');
10853 /* tokens, which can start a statement */
10854 /* TODO MS, __builtin_FOO */
10855 add_anchor_token('!');
10856 add_anchor_token('&');
10857 add_anchor_token('(');
10858 add_anchor_token('*');
10859 add_anchor_token('+');
10860 add_anchor_token('-');
10861 add_anchor_token('{');
10862 add_anchor_token('~');
10863 add_anchor_token(T_CHARACTER_CONSTANT);
10864 add_anchor_token(T_COLONCOLON);
10865 add_anchor_token(T_FLOATINGPOINT);
10866 add_anchor_token(T_IDENTIFIER);
10867 add_anchor_token(T_INTEGER);
10868 add_anchor_token(T_MINUSMINUS);
10869 add_anchor_token(T_PLUSPLUS);
10870 add_anchor_token(T_STRING_LITERAL);
10871 add_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10872 add_anchor_token(T_WIDE_STRING_LITERAL);
10873 add_anchor_token(T__Bool);
10874 add_anchor_token(T__Complex);
10875 add_anchor_token(T__Imaginary);
10876 add_anchor_token(T___FUNCTION__);
10877 add_anchor_token(T___PRETTY_FUNCTION__);
10878 add_anchor_token(T___alignof__);
10879 add_anchor_token(T___attribute__);
10880 add_anchor_token(T___builtin_va_start);
10881 add_anchor_token(T___extension__);
10882 add_anchor_token(T___func__);
10883 add_anchor_token(T___imag__);
10884 add_anchor_token(T___label__);
10885 add_anchor_token(T___real__);
10886 add_anchor_token(T___thread);
10887 add_anchor_token(T_asm);
10888 add_anchor_token(T_auto);
10889 add_anchor_token(T_bool);
10890 add_anchor_token(T_break);
10891 add_anchor_token(T_case);
10892 add_anchor_token(T_char);
10893 add_anchor_token(T_class);
10894 add_anchor_token(T_const);
10895 add_anchor_token(T_const_cast);
10896 add_anchor_token(T_continue);
10897 add_anchor_token(T_default);
10898 add_anchor_token(T_delete);
10899 add_anchor_token(T_double);
10900 add_anchor_token(T_do);
10901 add_anchor_token(T_dynamic_cast);
10902 add_anchor_token(T_enum);
10903 add_anchor_token(T_extern);
10904 add_anchor_token(T_false);
10905 add_anchor_token(T_float);
10906 add_anchor_token(T_for);
10907 add_anchor_token(T_goto);
10908 add_anchor_token(T_if);
10909 add_anchor_token(T_inline);
10910 add_anchor_token(T_int);
10911 add_anchor_token(T_long);
10912 add_anchor_token(T_new);
10913 add_anchor_token(T_operator);
10914 add_anchor_token(T_register);
10915 add_anchor_token(T_reinterpret_cast);
10916 add_anchor_token(T_restrict);
10917 add_anchor_token(T_return);
10918 add_anchor_token(T_short);
10919 add_anchor_token(T_signed);
10920 add_anchor_token(T_sizeof);
10921 add_anchor_token(T_static);
10922 add_anchor_token(T_static_cast);
10923 add_anchor_token(T_struct);
10924 add_anchor_token(T_switch);
10925 add_anchor_token(T_template);
10926 add_anchor_token(T_this);
10927 add_anchor_token(T_throw);
10928 add_anchor_token(T_true);
10929 add_anchor_token(T_try);
10930 add_anchor_token(T_typedef);
10931 add_anchor_token(T_typeid);
10932 add_anchor_token(T_typename);
10933 add_anchor_token(T_typeof);
10934 add_anchor_token(T_union);
10935 add_anchor_token(T_unsigned);
10936 add_anchor_token(T_using);
10937 add_anchor_token(T_void);
10938 add_anchor_token(T_volatile);
10939 add_anchor_token(T_wchar_t);
10940 add_anchor_token(T_while);
10942 size_t const top = environment_top();
10943 scope_t *old_scope = scope_push(&statement->compound.scope);
10945 statement_t **anchor = &statement->compound.statements;
10946 bool only_decls_so_far = true;
10947 while (token.type != '}') {
10948 if (token.type == T_EOF) {
10949 errorf(&statement->base.source_position,
10950 "EOF while parsing compound statement");
10953 statement_t *sub_statement = intern_parse_statement();
10954 if (is_invalid_statement(sub_statement)) {
10955 /* an error occurred. if we are at an anchor, return */
10961 if (warning.declaration_after_statement) {
10962 if (sub_statement->kind != STATEMENT_DECLARATION) {
10963 only_decls_so_far = false;
10964 } else if (!only_decls_so_far) {
10965 warningf(&sub_statement->base.source_position,
10966 "ISO C90 forbids mixed declarations and code");
10970 *anchor = sub_statement;
10972 while (sub_statement->base.next != NULL)
10973 sub_statement = sub_statement->base.next;
10975 anchor = &sub_statement->base.next;
10979 /* look over all statements again to produce no effect warnings */
10980 if (warning.unused_value) {
10981 statement_t *sub_statement = statement->compound.statements;
10982 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10983 if (sub_statement->kind != STATEMENT_EXPRESSION)
10985 /* don't emit a warning for the last expression in an expression
10986 * statement as it has always an effect */
10987 if (inside_expression_statement && sub_statement->base.next == NULL)
10990 expression_t *expression = sub_statement->expression.expression;
10991 if (!expression_has_effect(expression)) {
10992 warningf(&expression->base.source_position,
10993 "statement has no effect");
10999 rem_anchor_token(T_while);
11000 rem_anchor_token(T_wchar_t);
11001 rem_anchor_token(T_volatile);
11002 rem_anchor_token(T_void);
11003 rem_anchor_token(T_using);
11004 rem_anchor_token(T_unsigned);
11005 rem_anchor_token(T_union);
11006 rem_anchor_token(T_typeof);
11007 rem_anchor_token(T_typename);
11008 rem_anchor_token(T_typeid);
11009 rem_anchor_token(T_typedef);
11010 rem_anchor_token(T_try);
11011 rem_anchor_token(T_true);
11012 rem_anchor_token(T_throw);
11013 rem_anchor_token(T_this);
11014 rem_anchor_token(T_template);
11015 rem_anchor_token(T_switch);
11016 rem_anchor_token(T_struct);
11017 rem_anchor_token(T_static_cast);
11018 rem_anchor_token(T_static);
11019 rem_anchor_token(T_sizeof);
11020 rem_anchor_token(T_signed);
11021 rem_anchor_token(T_short);
11022 rem_anchor_token(T_return);
11023 rem_anchor_token(T_restrict);
11024 rem_anchor_token(T_reinterpret_cast);
11025 rem_anchor_token(T_register);
11026 rem_anchor_token(T_operator);
11027 rem_anchor_token(T_new);
11028 rem_anchor_token(T_long);
11029 rem_anchor_token(T_int);
11030 rem_anchor_token(T_inline);
11031 rem_anchor_token(T_if);
11032 rem_anchor_token(T_goto);
11033 rem_anchor_token(T_for);
11034 rem_anchor_token(T_float);
11035 rem_anchor_token(T_false);
11036 rem_anchor_token(T_extern);
11037 rem_anchor_token(T_enum);
11038 rem_anchor_token(T_dynamic_cast);
11039 rem_anchor_token(T_do);
11040 rem_anchor_token(T_double);
11041 rem_anchor_token(T_delete);
11042 rem_anchor_token(T_default);
11043 rem_anchor_token(T_continue);
11044 rem_anchor_token(T_const_cast);
11045 rem_anchor_token(T_const);
11046 rem_anchor_token(T_class);
11047 rem_anchor_token(T_char);
11048 rem_anchor_token(T_case);
11049 rem_anchor_token(T_break);
11050 rem_anchor_token(T_bool);
11051 rem_anchor_token(T_auto);
11052 rem_anchor_token(T_asm);
11053 rem_anchor_token(T___thread);
11054 rem_anchor_token(T___real__);
11055 rem_anchor_token(T___label__);
11056 rem_anchor_token(T___imag__);
11057 rem_anchor_token(T___func__);
11058 rem_anchor_token(T___extension__);
11059 rem_anchor_token(T___builtin_va_start);
11060 rem_anchor_token(T___attribute__);
11061 rem_anchor_token(T___alignof__);
11062 rem_anchor_token(T___PRETTY_FUNCTION__);
11063 rem_anchor_token(T___FUNCTION__);
11064 rem_anchor_token(T__Imaginary);
11065 rem_anchor_token(T__Complex);
11066 rem_anchor_token(T__Bool);
11067 rem_anchor_token(T_WIDE_STRING_LITERAL);
11068 rem_anchor_token(T_WIDE_CHARACTER_CONSTANT);
11069 rem_anchor_token(T_STRING_LITERAL);
11070 rem_anchor_token(T_PLUSPLUS);
11071 rem_anchor_token(T_MINUSMINUS);
11072 rem_anchor_token(T_INTEGER);
11073 rem_anchor_token(T_IDENTIFIER);
11074 rem_anchor_token(T_FLOATINGPOINT);
11075 rem_anchor_token(T_COLONCOLON);
11076 rem_anchor_token(T_CHARACTER_CONSTANT);
11077 rem_anchor_token('~');
11078 rem_anchor_token('{');
11079 rem_anchor_token('-');
11080 rem_anchor_token('+');
11081 rem_anchor_token('*');
11082 rem_anchor_token('(');
11083 rem_anchor_token('&');
11084 rem_anchor_token('!');
11085 rem_anchor_token('}');
11086 assert(current_scope == &statement->compound.scope);
11087 scope_pop(old_scope);
11088 environment_pop_to(top);
11095 * Check for unused global static functions and variables
11097 static void check_unused_globals(void)
11099 if (!warning.unused_function && !warning.unused_variable)
11102 for (const entity_t *entity = file_scope->entities; entity != NULL;
11103 entity = entity->base.next) {
11104 if (!is_declaration(entity))
11107 const declaration_t *declaration = &entity->declaration;
11108 if (declaration->used ||
11109 declaration->modifiers & DM_UNUSED ||
11110 declaration->modifiers & DM_USED ||
11111 declaration->storage_class != STORAGE_CLASS_STATIC)
11114 type_t *const type = declaration->type;
11116 if (entity->kind == ENTITY_FUNCTION) {
11117 /* inhibit warning for static inline functions */
11118 if (entity->function.is_inline)
11121 s = entity->function.statement != NULL ? "defined" : "declared";
11126 warningf(&declaration->base.source_position, "'%#T' %s but not used",
11127 type, declaration->base.symbol, s);
11131 static void parse_global_asm(void)
11133 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
11136 expect('(', end_error);
11138 statement->asms.asm_text = parse_string_literals();
11139 statement->base.next = unit->global_asm;
11140 unit->global_asm = statement;
11142 expect(')', end_error);
11143 expect(';', end_error);
11148 static void parse_linkage_specification(void)
11151 assert(token.type == T_STRING_LITERAL);
11153 const char *linkage = parse_string_literals().begin;
11155 linkage_kind_t old_linkage = current_linkage;
11156 linkage_kind_t new_linkage;
11157 if (strcmp(linkage, "C") == 0) {
11158 new_linkage = LINKAGE_C;
11159 } else if (strcmp(linkage, "C++") == 0) {
11160 new_linkage = LINKAGE_CXX;
11162 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
11163 new_linkage = LINKAGE_INVALID;
11165 current_linkage = new_linkage;
11167 if (token.type == '{') {
11170 expect('}', end_error);
11176 assert(current_linkage == new_linkage);
11177 current_linkage = old_linkage;
11180 static void parse_external(void)
11182 switch (token.type) {
11183 DECLARATION_START_NO_EXTERN
11185 case T___extension__:
11186 /* tokens below are for implicit int */
11187 case '&': /* & x; -> int& x; (and error later, because C++ has no
11189 case '*': /* * x; -> int* x; */
11190 case '(': /* (x); -> int (x); */
11191 parse_external_declaration();
11195 if (look_ahead(1)->type == T_STRING_LITERAL) {
11196 parse_linkage_specification();
11198 parse_external_declaration();
11203 parse_global_asm();
11207 parse_namespace_definition();
11211 if (!strict_mode) {
11213 warningf(HERE, "stray ';' outside of function");
11220 errorf(HERE, "stray %K outside of function", &token);
11221 if (token.type == '(' || token.type == '{' || token.type == '[')
11222 eat_until_matching_token(token.type);
11228 static void parse_externals(void)
11230 add_anchor_token('}');
11231 add_anchor_token(T_EOF);
11234 unsigned char token_anchor_copy[T_LAST_TOKEN];
11235 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
11238 while (token.type != T_EOF && token.type != '}') {
11240 bool anchor_leak = false;
11241 for (int i = 0; i != T_LAST_TOKEN; ++i) {
11242 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
11244 errorf(HERE, "Leaked anchor token %k %d times", i, count);
11245 anchor_leak = true;
11248 if (in_gcc_extension) {
11249 errorf(HERE, "Leaked __extension__");
11250 anchor_leak = true;
11260 rem_anchor_token(T_EOF);
11261 rem_anchor_token('}');
11265 * Parse a translation unit.
11267 static void parse_translation_unit(void)
11269 add_anchor_token(T_EOF);
11274 if (token.type == T_EOF)
11277 errorf(HERE, "stray %K outside of function", &token);
11278 if (token.type == '(' || token.type == '{' || token.type == '[')
11279 eat_until_matching_token(token.type);
11287 * @return the translation unit or NULL if errors occurred.
11289 void start_parsing(void)
11291 environment_stack = NEW_ARR_F(stack_entry_t, 0);
11292 label_stack = NEW_ARR_F(stack_entry_t, 0);
11293 diagnostic_count = 0;
11297 type_set_output(stderr);
11298 ast_set_output(stderr);
11300 assert(unit == NULL);
11301 unit = allocate_ast_zero(sizeof(unit[0]));
11303 assert(file_scope == NULL);
11304 file_scope = &unit->scope;
11306 assert(current_scope == NULL);
11307 scope_push(&unit->scope);
11310 translation_unit_t *finish_parsing(void)
11312 assert(current_scope == &unit->scope);
11315 assert(file_scope == &unit->scope);
11316 check_unused_globals();
11319 DEL_ARR_F(environment_stack);
11320 DEL_ARR_F(label_stack);
11322 translation_unit_t *result = unit;
11327 /* GCC allows global arrays without size and assigns them a length of one,
11328 * if no different declaration follows */
11329 static void complete_incomplete_arrays(void)
11331 size_t n = ARR_LEN(incomplete_arrays);
11332 for (size_t i = 0; i != n; ++i) {
11333 declaration_t *const decl = incomplete_arrays[i];
11334 type_t *const orig_type = decl->type;
11335 type_t *const type = skip_typeref(orig_type);
11337 if (!is_type_incomplete(type))
11340 if (warning.other) {
11341 warningf(&decl->base.source_position,
11342 "array '%#T' assumed to have one element",
11343 orig_type, decl->base.symbol);
11346 type_t *const new_type = duplicate_type(type);
11347 new_type->array.size_constant = true;
11348 new_type->array.has_implicit_size = true;
11349 new_type->array.size = 1;
11351 type_t *const result = typehash_insert(new_type);
11352 if (type != result)
11355 decl->type = result;
11361 lookahead_bufpos = 0;
11362 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
11365 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
11366 incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
11367 parse_translation_unit();
11368 complete_incomplete_arrays();
11369 DEL_ARR_F(incomplete_arrays);
11370 incomplete_arrays = NULL;
11374 * Initialize the parser.
11376 void init_parser(void)
11378 sym_anonymous = symbol_table_insert("<anonymous>");
11380 if (c_mode & _MS) {
11381 /* add predefined symbols for extended-decl-modifier */
11382 sym_align = symbol_table_insert("align");
11383 sym_allocate = symbol_table_insert("allocate");
11384 sym_dllimport = symbol_table_insert("dllimport");
11385 sym_dllexport = symbol_table_insert("dllexport");
11386 sym_naked = symbol_table_insert("naked");
11387 sym_noinline = symbol_table_insert("noinline");
11388 sym_returns_twice = symbol_table_insert("returns_twice");
11389 sym_noreturn = symbol_table_insert("noreturn");
11390 sym_nothrow = symbol_table_insert("nothrow");
11391 sym_novtable = symbol_table_insert("novtable");
11392 sym_property = symbol_table_insert("property");
11393 sym_get = symbol_table_insert("get");
11394 sym_put = symbol_table_insert("put");
11395 sym_selectany = symbol_table_insert("selectany");
11396 sym_thread = symbol_table_insert("thread");
11397 sym_uuid = symbol_table_insert("uuid");
11398 sym_deprecated = symbol_table_insert("deprecated");
11399 sym_restrict = symbol_table_insert("restrict");
11400 sym_noalias = symbol_table_insert("noalias");
11402 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11404 init_expression_parsers();
11405 obstack_init(&temp_obst);
11407 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11408 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11412 * Terminate the parser.
11414 void exit_parser(void)
11416 obstack_free(&temp_obst, NULL);
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