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;
143 #define PUSH_PARENT(stmt) \
144 statement_t *const prev_parent = current_parent; \
145 ((void)(current_parent = (stmt)))
146 #define POP_PARENT ((void)(current_parent = prev_parent))
148 /** special symbol used for anonymous entities. */
149 static const symbol_t *sym_anonymous = NULL;
151 /* symbols for Microsoft extended-decl-modifier */
152 static const symbol_t *sym_align = NULL;
153 static const symbol_t *sym_allocate = NULL;
154 static const symbol_t *sym_dllimport = NULL;
155 static const symbol_t *sym_dllexport = NULL;
156 static const symbol_t *sym_naked = NULL;
157 static const symbol_t *sym_noinline = NULL;
158 static const symbol_t *sym_noreturn = NULL;
159 static const symbol_t *sym_nothrow = NULL;
160 static const symbol_t *sym_novtable = NULL;
161 static const symbol_t *sym_property = NULL;
162 static const symbol_t *sym_get = NULL;
163 static const symbol_t *sym_put = NULL;
164 static const symbol_t *sym_selectany = NULL;
165 static const symbol_t *sym_thread = NULL;
166 static const symbol_t *sym_uuid = NULL;
167 static const symbol_t *sym_deprecated = NULL;
168 static const symbol_t *sym_restrict = NULL;
169 static const symbol_t *sym_noalias = NULL;
171 /** The token anchor set */
172 static unsigned char token_anchor_set[T_LAST_TOKEN];
174 /** The current source position. */
175 #define HERE (&token.source_position)
177 /** true if we are in GCC mode. */
178 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
180 static type_t *type_valist;
182 static statement_t *parse_compound_statement(bool inside_expression_statement);
183 static statement_t *parse_statement(void);
185 static expression_t *parse_sub_expression(precedence_t);
186 static expression_t *parse_expression(void);
187 static type_t *parse_typename(void);
188 static void parse_externals(void);
189 static void parse_external(void);
191 static void parse_compound_type_entries(compound_t *compound_declaration);
193 typedef enum declarator_flags_t {
195 DECL_MAY_BE_ABSTRACT = 1U << 0,
196 DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
197 DECL_IS_PARAMETER = 1U << 2
198 } declarator_flags_t;
200 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
201 declarator_flags_t flags);
203 static entity_t *record_entity(entity_t *entity, bool is_definition);
205 static void semantic_comparison(binary_expression_t *expression);
207 #define STORAGE_CLASSES \
208 STORAGE_CLASSES_NO_EXTERN \
211 #define STORAGE_CLASSES_NO_EXTERN \
218 #define TYPE_QUALIFIERS \
223 case T__forceinline: \
224 case T___attribute__:
226 #define COMPLEX_SPECIFIERS \
228 #define IMAGINARY_SPECIFIERS \
231 #define TYPE_SPECIFIERS \
233 case T___builtin_va_list: \
252 #define DECLARATION_START \
257 #define DECLARATION_START_NO_EXTERN \
258 STORAGE_CLASSES_NO_EXTERN \
262 #define TYPENAME_START \
266 #define EXPRESSION_START \
275 case T_CHARACTER_CONSTANT: \
276 case T_FLOATINGPOINT: \
280 case T_STRING_LITERAL: \
281 case T_WIDE_CHARACTER_CONSTANT: \
282 case T_WIDE_STRING_LITERAL: \
283 case T___FUNCDNAME__: \
284 case T___FUNCSIG__: \
285 case T___FUNCTION__: \
286 case T___PRETTY_FUNCTION__: \
287 case T___alignof__: \
288 case T___builtin_alloca: \
289 case T___builtin_classify_type: \
290 case T___builtin_constant_p: \
291 case T___builtin_expect: \
292 case T___builtin_huge_val: \
293 case T___builtin_inf: \
294 case T___builtin_inff: \
295 case T___builtin_infl: \
296 case T___builtin_isgreater: \
297 case T___builtin_isgreaterequal: \
298 case T___builtin_isless: \
299 case T___builtin_islessequal: \
300 case T___builtin_islessgreater: \
301 case T___builtin_isunordered: \
302 case T___builtin_nan: \
303 case T___builtin_nanf: \
304 case T___builtin_nanl: \
305 case T___builtin_offsetof: \
306 case T___builtin_prefetch: \
307 case T___builtin_va_arg: \
308 case T___builtin_va_end: \
309 case T___builtin_va_start: \
320 * Allocate an AST node with given size and
321 * initialize all fields with zero.
323 static void *allocate_ast_zero(size_t size)
325 void *res = allocate_ast(size);
326 memset(res, 0, size);
330 static size_t get_entity_struct_size(entity_kind_t kind)
332 static const size_t sizes[] = {
333 [ENTITY_VARIABLE] = sizeof(variable_t),
334 [ENTITY_COMPOUND_MEMBER] = sizeof(variable_t),
335 [ENTITY_FUNCTION] = sizeof(function_t),
336 [ENTITY_TYPEDEF] = sizeof(typedef_t),
337 [ENTITY_STRUCT] = sizeof(compound_t),
338 [ENTITY_UNION] = sizeof(compound_t),
339 [ENTITY_ENUM] = sizeof(enum_t),
340 [ENTITY_ENUM_VALUE] = sizeof(enum_value_t),
341 [ENTITY_LABEL] = sizeof(label_t),
342 [ENTITY_LOCAL_LABEL] = sizeof(label_t),
343 [ENTITY_NAMESPACE] = sizeof(namespace_t)
345 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
346 assert(sizes[kind] != 0);
350 static entity_t *allocate_entity_zero(entity_kind_t kind)
352 size_t size = get_entity_struct_size(kind);
353 entity_t *entity = allocate_ast_zero(size);
359 * Returns the size of a statement node.
361 * @param kind the statement kind
363 static size_t get_statement_struct_size(statement_kind_t kind)
365 static const size_t sizes[] = {
366 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
367 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
368 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
369 [STATEMENT_RETURN] = sizeof(return_statement_t),
370 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
371 [STATEMENT_LOCAL_LABEL] = sizeof(local_label_statement_t),
372 [STATEMENT_IF] = sizeof(if_statement_t),
373 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
374 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
375 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
376 [STATEMENT_BREAK] = sizeof(statement_base_t),
377 [STATEMENT_GOTO] = sizeof(goto_statement_t),
378 [STATEMENT_LABEL] = sizeof(label_statement_t),
379 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
380 [STATEMENT_WHILE] = sizeof(while_statement_t),
381 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
382 [STATEMENT_FOR] = sizeof(for_statement_t),
383 [STATEMENT_ASM] = sizeof(asm_statement_t),
384 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
385 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
387 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
388 assert(sizes[kind] != 0);
393 * Returns the size of an expression node.
395 * @param kind the expression kind
397 static size_t get_expression_struct_size(expression_kind_t kind)
399 static const size_t sizes[] = {
400 [EXPR_INVALID] = sizeof(expression_base_t),
401 [EXPR_REFERENCE] = sizeof(reference_expression_t),
402 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
403 [EXPR_CONST] = sizeof(const_expression_t),
404 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
405 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
406 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
407 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
408 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
409 [EXPR_CALL] = sizeof(call_expression_t),
410 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
411 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
412 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
413 [EXPR_SELECT] = sizeof(select_expression_t),
414 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
415 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
416 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
417 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
418 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
419 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
420 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
421 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
422 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
423 [EXPR_VA_START] = sizeof(va_start_expression_t),
424 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
425 [EXPR_STATEMENT] = sizeof(statement_expression_t),
426 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
428 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
429 return sizes[EXPR_UNARY_FIRST];
431 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
432 return sizes[EXPR_BINARY_FIRST];
434 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
435 assert(sizes[kind] != 0);
440 * Allocate a statement node of given kind and initialize all
443 static statement_t *allocate_statement_zero(statement_kind_t kind)
445 size_t size = get_statement_struct_size(kind);
446 statement_t *res = allocate_ast_zero(size);
448 res->base.kind = kind;
449 res->base.parent = current_parent;
450 res->base.source_position = token.source_position;
455 * Allocate an expression node of given kind and initialize all
458 static expression_t *allocate_expression_zero(expression_kind_t kind)
460 size_t size = get_expression_struct_size(kind);
461 expression_t *res = allocate_ast_zero(size);
463 res->base.kind = kind;
464 res->base.type = type_error_type;
465 res->base.source_position = token.source_position;
470 * Creates a new invalid expression.
472 static expression_t *create_invalid_expression(void)
474 return allocate_expression_zero(EXPR_INVALID);
478 * Creates a new invalid statement.
480 static statement_t *create_invalid_statement(void)
482 return allocate_statement_zero(STATEMENT_INVALID);
486 * Allocate a new empty statement.
488 static statement_t *create_empty_statement(void)
490 return allocate_statement_zero(STATEMENT_EMPTY);
494 * Returns the size of a type node.
496 * @param kind the type kind
498 static size_t get_type_struct_size(type_kind_t kind)
500 static const size_t sizes[] = {
501 [TYPE_ATOMIC] = sizeof(atomic_type_t),
502 [TYPE_COMPLEX] = sizeof(complex_type_t),
503 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
504 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
505 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
506 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
507 [TYPE_ENUM] = sizeof(enum_type_t),
508 [TYPE_FUNCTION] = sizeof(function_type_t),
509 [TYPE_POINTER] = sizeof(pointer_type_t),
510 [TYPE_ARRAY] = sizeof(array_type_t),
511 [TYPE_BUILTIN] = sizeof(builtin_type_t),
512 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
513 [TYPE_TYPEOF] = sizeof(typeof_type_t),
515 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
516 assert(kind <= TYPE_TYPEOF);
517 assert(sizes[kind] != 0);
522 * Allocate a type node of given kind and initialize all
525 * @param kind type kind to allocate
527 static type_t *allocate_type_zero(type_kind_t kind)
529 size_t size = get_type_struct_size(kind);
530 type_t *res = obstack_alloc(type_obst, size);
531 memset(res, 0, size);
532 res->base.kind = kind;
538 * Returns the size of an initializer node.
540 * @param kind the initializer kind
542 static size_t get_initializer_size(initializer_kind_t kind)
544 static const size_t sizes[] = {
545 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
546 [INITIALIZER_STRING] = sizeof(initializer_string_t),
547 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
548 [INITIALIZER_LIST] = sizeof(initializer_list_t),
549 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
551 assert(kind < sizeof(sizes) / sizeof(*sizes));
552 assert(sizes[kind] != 0);
557 * Allocate an initializer node of given kind and initialize all
560 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
562 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
569 * Free a type from the type obstack.
571 static void free_type(void *type)
573 obstack_free(type_obst, type);
577 * Returns the index of the top element of the environment stack.
579 static size_t environment_top(void)
581 return ARR_LEN(environment_stack);
585 * Returns the index of the top element of the global label stack.
587 static size_t label_top(void)
589 return ARR_LEN(label_stack);
593 * Return the next token.
595 static inline void next_token(void)
597 token = lookahead_buffer[lookahead_bufpos];
598 lookahead_buffer[lookahead_bufpos] = lexer_token;
601 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
604 print_token(stderr, &token);
605 fprintf(stderr, "\n");
610 * Return the next token with a given lookahead.
612 static inline const token_t *look_ahead(int num)
614 assert(num > 0 && num <= MAX_LOOKAHEAD);
615 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
616 return &lookahead_buffer[pos];
620 * Adds a token to the token anchor set (a multi-set).
622 static void add_anchor_token(int token_type)
624 assert(0 <= token_type && token_type < T_LAST_TOKEN);
625 ++token_anchor_set[token_type];
628 static int save_and_reset_anchor_state(int token_type)
630 assert(0 <= token_type && token_type < T_LAST_TOKEN);
631 int count = token_anchor_set[token_type];
632 token_anchor_set[token_type] = 0;
636 static void restore_anchor_state(int token_type, int count)
638 assert(0 <= token_type && token_type < T_LAST_TOKEN);
639 token_anchor_set[token_type] = count;
643 * Remove a token from the token anchor set (a multi-set).
645 static void rem_anchor_token(int token_type)
647 assert(0 <= token_type && token_type < T_LAST_TOKEN);
648 assert(token_anchor_set[token_type] != 0);
649 --token_anchor_set[token_type];
652 static bool at_anchor(void)
656 return token_anchor_set[token.type];
660 * Eat tokens until a matching token is found.
662 static void eat_until_matching_token(int type)
666 case '(': end_token = ')'; break;
667 case '{': end_token = '}'; break;
668 case '[': end_token = ']'; break;
669 default: end_token = type; break;
672 unsigned parenthesis_count = 0;
673 unsigned brace_count = 0;
674 unsigned bracket_count = 0;
675 while (token.type != end_token ||
676 parenthesis_count != 0 ||
678 bracket_count != 0) {
679 switch (token.type) {
681 case '(': ++parenthesis_count; break;
682 case '{': ++brace_count; break;
683 case '[': ++bracket_count; break;
686 if (parenthesis_count > 0)
696 if (bracket_count > 0)
699 if (token.type == end_token &&
700 parenthesis_count == 0 &&
714 * Eat input tokens until an anchor is found.
716 static void eat_until_anchor(void)
718 while (token_anchor_set[token.type] == 0) {
719 if (token.type == '(' || token.type == '{' || token.type == '[')
720 eat_until_matching_token(token.type);
725 static void eat_block(void)
727 eat_until_matching_token('{');
728 if (token.type == '}')
732 #define eat(token_type) do { assert(token.type == (token_type)); next_token(); } while (0)
735 * Report a parse error because an expected token was not found.
738 #if defined __GNUC__ && __GNUC__ >= 4
739 __attribute__((sentinel))
741 void parse_error_expected(const char *message, ...)
743 if (message != NULL) {
744 errorf(HERE, "%s", message);
747 va_start(ap, message);
748 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
753 * Report an incompatible type.
755 static void type_error_incompatible(const char *msg,
756 const source_position_t *source_position, type_t *type1, type_t *type2)
758 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
763 * Expect the the current token is the expected token.
764 * If not, generate an error, eat the current statement,
765 * and goto the end_error label.
767 #define expect(expected) \
769 if (UNLIKELY(token.type != (expected))) { \
770 parse_error_expected(NULL, (expected), NULL); \
771 add_anchor_token(expected); \
772 eat_until_anchor(); \
773 if (token.type == expected) \
775 rem_anchor_token(expected); \
781 static scope_t *scope_push(scope_t *new_scope)
783 if (current_scope != NULL) {
784 new_scope->depth = current_scope->depth + 1;
787 scope_t *old_scope = current_scope;
788 current_scope = new_scope;
792 static void scope_pop(scope_t *old_scope)
794 current_scope = old_scope;
798 * Search an entity by its symbol in a given namespace.
800 static entity_t *get_entity(const symbol_t *const symbol,
801 namespace_tag_t namespc)
803 entity_t *entity = symbol->entity;
804 for (; entity != NULL; entity = entity->base.symbol_next) {
805 if (entity->base.namespc == namespc)
813 * pushs an entity on the environment stack and links the corresponding symbol
816 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
818 symbol_t *symbol = entity->base.symbol;
819 entity_namespace_t namespc = entity->base.namespc;
820 assert(namespc != NAMESPACE_INVALID);
822 /* replace/add entity into entity list of the symbol */
825 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
830 /* replace an entry? */
831 if (iter->base.namespc == namespc) {
832 entity->base.symbol_next = iter->base.symbol_next;
838 /* remember old declaration */
840 entry.symbol = symbol;
841 entry.old_entity = iter;
842 entry.namespc = namespc;
843 ARR_APP1(stack_entry_t, *stack_ptr, entry);
847 * Push an entity on the environment stack.
849 static void environment_push(entity_t *entity)
851 assert(entity->base.source_position.input_name != NULL);
852 assert(entity->base.parent_scope != NULL);
853 stack_push(&environment_stack, entity);
857 * Push a declaration on the global label stack.
859 * @param declaration the declaration
861 static void label_push(entity_t *label)
863 /* we abuse the parameters scope as parent for the labels */
864 label->base.parent_scope = ¤t_function->parameters;
865 stack_push(&label_stack, label);
869 * pops symbols from the environment stack until @p new_top is the top element
871 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
873 stack_entry_t *stack = *stack_ptr;
874 size_t top = ARR_LEN(stack);
877 assert(new_top <= top);
881 for (i = top; i > new_top; --i) {
882 stack_entry_t *entry = &stack[i - 1];
884 entity_t *old_entity = entry->old_entity;
885 symbol_t *symbol = entry->symbol;
886 entity_namespace_t namespc = entry->namespc;
888 /* replace with old_entity/remove */
891 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
893 assert(iter != NULL);
894 /* replace an entry? */
895 if (iter->base.namespc == namespc)
899 /* restore definition from outer scopes (if there was one) */
900 if (old_entity != NULL) {
901 old_entity->base.symbol_next = iter->base.symbol_next;
902 *anchor = old_entity;
904 /* remove entry from list */
905 *anchor = iter->base.symbol_next;
909 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
913 * Pop all entries from the environment stack until the new_top
916 * @param new_top the new stack top
918 static void environment_pop_to(size_t new_top)
920 stack_pop_to(&environment_stack, new_top);
924 * Pop all entries from the global label stack until the new_top
927 * @param new_top the new stack top
929 static void label_pop_to(size_t new_top)
931 stack_pop_to(&label_stack, new_top);
934 static int get_akind_rank(atomic_type_kind_t akind)
939 static int get_rank(const type_t *type)
941 assert(!is_typeref(type));
942 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
943 * and esp. footnote 108). However we can't fold constants (yet), so we
944 * can't decide whether unsigned int is possible, while int always works.
945 * (unsigned int would be preferable when possible... for stuff like
946 * struct { enum { ... } bla : 4; } ) */
947 if (type->kind == TYPE_ENUM)
948 return get_akind_rank(ATOMIC_TYPE_INT);
950 assert(type->kind == TYPE_ATOMIC);
951 return get_akind_rank(type->atomic.akind);
954 static type_t *promote_integer(type_t *type)
956 if (type->kind == TYPE_BITFIELD)
957 type = type->bitfield.base_type;
959 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
966 * Create a cast expression.
968 * @param expression the expression to cast
969 * @param dest_type the destination type
971 static expression_t *create_cast_expression(expression_t *expression,
974 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
976 cast->unary.value = expression;
977 cast->base.type = dest_type;
983 * Check if a given expression represents the 0 pointer constant.
985 static bool is_null_pointer_constant(const expression_t *expression)
987 /* skip void* cast */
988 if (expression->kind == EXPR_UNARY_CAST
989 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
990 expression = expression->unary.value;
993 /* TODO: not correct yet, should be any constant integer expression
994 * which evaluates to 0 */
995 if (expression->kind != EXPR_CONST)
998 type_t *const type = skip_typeref(expression->base.type);
999 if (!is_type_integer(type))
1002 return expression->conste.v.int_value == 0;
1006 * Create an implicit cast expression.
1008 * @param expression the expression to cast
1009 * @param dest_type the destination type
1011 static expression_t *create_implicit_cast(expression_t *expression,
1014 type_t *const source_type = expression->base.type;
1016 if (source_type == dest_type)
1019 return create_cast_expression(expression, dest_type);
1022 typedef enum assign_error_t {
1024 ASSIGN_ERROR_INCOMPATIBLE,
1025 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1026 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1027 ASSIGN_WARNING_POINTER_FROM_INT,
1028 ASSIGN_WARNING_INT_FROM_POINTER
1031 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1032 const expression_t *const right,
1033 const char *context,
1034 const source_position_t *source_position)
1036 type_t *const orig_type_right = right->base.type;
1037 type_t *const type_left = skip_typeref(orig_type_left);
1038 type_t *const type_right = skip_typeref(orig_type_right);
1041 case ASSIGN_SUCCESS:
1043 case ASSIGN_ERROR_INCOMPATIBLE:
1044 errorf(source_position,
1045 "destination type '%T' in %s is incompatible with type '%T'",
1046 orig_type_left, context, orig_type_right);
1049 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1050 if (warning.other) {
1051 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
1052 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1054 /* the left type has all qualifiers from the right type */
1055 unsigned missing_qualifiers
1056 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1057 warningf(source_position,
1058 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1059 orig_type_left, context, orig_type_right, missing_qualifiers);
1064 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1065 if (warning.other) {
1066 warningf(source_position,
1067 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1068 orig_type_left, context, right, orig_type_right);
1072 case ASSIGN_WARNING_POINTER_FROM_INT:
1073 if (warning.other) {
1074 warningf(source_position,
1075 "%s makes pointer '%T' from integer '%T' without a cast",
1076 context, orig_type_left, orig_type_right);
1080 case ASSIGN_WARNING_INT_FROM_POINTER:
1081 if (warning.other) {
1082 warningf(source_position,
1083 "%s makes integer '%T' from pointer '%T' without a cast",
1084 context, orig_type_left, orig_type_right);
1089 panic("invalid error value");
1093 /** Implements the rules from § 6.5.16.1 */
1094 static assign_error_t semantic_assign(type_t *orig_type_left,
1095 const expression_t *const right)
1097 type_t *const orig_type_right = right->base.type;
1098 type_t *const type_left = skip_typeref(orig_type_left);
1099 type_t *const type_right = skip_typeref(orig_type_right);
1101 if (is_type_pointer(type_left)) {
1102 if (is_null_pointer_constant(right)) {
1103 return ASSIGN_SUCCESS;
1104 } else if (is_type_pointer(type_right)) {
1105 type_t *points_to_left
1106 = skip_typeref(type_left->pointer.points_to);
1107 type_t *points_to_right
1108 = skip_typeref(type_right->pointer.points_to);
1109 assign_error_t res = ASSIGN_SUCCESS;
1111 /* the left type has all qualifiers from the right type */
1112 unsigned missing_qualifiers
1113 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1114 if (missing_qualifiers != 0) {
1115 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1118 points_to_left = get_unqualified_type(points_to_left);
1119 points_to_right = get_unqualified_type(points_to_right);
1121 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1124 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1125 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1126 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1129 if (!types_compatible(points_to_left, points_to_right)) {
1130 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1134 } else if (is_type_integer(type_right)) {
1135 return ASSIGN_WARNING_POINTER_FROM_INT;
1137 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1138 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1139 && is_type_pointer(type_right))) {
1140 return ASSIGN_SUCCESS;
1141 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1142 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1143 type_t *const unqual_type_left = get_unqualified_type(type_left);
1144 type_t *const unqual_type_right = get_unqualified_type(type_right);
1145 if (types_compatible(unqual_type_left, unqual_type_right)) {
1146 return ASSIGN_SUCCESS;
1148 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1149 return ASSIGN_WARNING_INT_FROM_POINTER;
1152 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1153 return ASSIGN_SUCCESS;
1155 return ASSIGN_ERROR_INCOMPATIBLE;
1158 static expression_t *parse_constant_expression(void)
1160 expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1162 if (!is_constant_expression(result)) {
1163 errorf(&result->base.source_position,
1164 "expression '%E' is not constant\n", result);
1170 static expression_t *parse_assignment_expression(void)
1172 return parse_sub_expression(PREC_ASSIGNMENT);
1175 static string_t parse_string_literals(void)
1177 assert(token.type == T_STRING_LITERAL);
1178 string_t result = token.v.string;
1182 while (token.type == T_STRING_LITERAL) {
1183 result = concat_strings(&result, &token.v.string);
1190 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1191 [GNU_AK_CONST] = "const",
1192 [GNU_AK_VOLATILE] = "volatile",
1193 [GNU_AK_CDECL] = "cdecl",
1194 [GNU_AK_STDCALL] = "stdcall",
1195 [GNU_AK_FASTCALL] = "fastcall",
1196 [GNU_AK_DEPRECATED] = "deprecated",
1197 [GNU_AK_NOINLINE] = "noinline",
1198 [GNU_AK_NORETURN] = "noreturn",
1199 [GNU_AK_NAKED] = "naked",
1200 [GNU_AK_PURE] = "pure",
1201 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1202 [GNU_AK_MALLOC] = "malloc",
1203 [GNU_AK_WEAK] = "weak",
1204 [GNU_AK_CONSTRUCTOR] = "constructor",
1205 [GNU_AK_DESTRUCTOR] = "destructor",
1206 [GNU_AK_NOTHROW] = "nothrow",
1207 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1208 [GNU_AK_COMMON] = "common",
1209 [GNU_AK_NOCOMMON] = "nocommon",
1210 [GNU_AK_PACKED] = "packed",
1211 [GNU_AK_SHARED] = "shared",
1212 [GNU_AK_NOTSHARED] = "notshared",
1213 [GNU_AK_USED] = "used",
1214 [GNU_AK_UNUSED] = "unused",
1215 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1216 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1217 [GNU_AK_LONGCALL] = "longcall",
1218 [GNU_AK_SHORTCALL] = "shortcall",
1219 [GNU_AK_LONG_CALL] = "long_call",
1220 [GNU_AK_SHORT_CALL] = "short_call",
1221 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1222 [GNU_AK_INTERRUPT] = "interrupt",
1223 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1224 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1225 [GNU_AK_NESTING] = "nesting",
1226 [GNU_AK_NEAR] = "near",
1227 [GNU_AK_FAR] = "far",
1228 [GNU_AK_SIGNAL] = "signal",
1229 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1230 [GNU_AK_TINY_DATA] = "tiny_data",
1231 [GNU_AK_SAVEALL] = "saveall",
1232 [GNU_AK_FLATTEN] = "flatten",
1233 [GNU_AK_SSEREGPARM] = "sseregparm",
1234 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1235 [GNU_AK_RETURN_TWICE] = "return_twice",
1236 [GNU_AK_MAY_ALIAS] = "may_alias",
1237 [GNU_AK_MS_STRUCT] = "ms_struct",
1238 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1239 [GNU_AK_DLLIMPORT] = "dllimport",
1240 [GNU_AK_DLLEXPORT] = "dllexport",
1241 [GNU_AK_ALIGNED] = "aligned",
1242 [GNU_AK_ALIAS] = "alias",
1243 [GNU_AK_SECTION] = "section",
1244 [GNU_AK_FORMAT] = "format",
1245 [GNU_AK_FORMAT_ARG] = "format_arg",
1246 [GNU_AK_WEAKREF] = "weakref",
1247 [GNU_AK_NONNULL] = "nonnull",
1248 [GNU_AK_TLS_MODEL] = "tls_model",
1249 [GNU_AK_VISIBILITY] = "visibility",
1250 [GNU_AK_REGPARM] = "regparm",
1251 [GNU_AK_MODE] = "mode",
1252 [GNU_AK_MODEL] = "model",
1253 [GNU_AK_TRAP_EXIT] = "trap_exit",
1254 [GNU_AK_SP_SWITCH] = "sp_switch",
1255 [GNU_AK_SENTINEL] = "sentinel"
1259 * compare two string, ignoring double underscores on the second.
1261 static int strcmp_underscore(const char *s1, const char *s2)
1263 if (s2[0] == '_' && s2[1] == '_') {
1264 size_t len2 = strlen(s2);
1265 size_t len1 = strlen(s1);
1266 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1267 return strncmp(s1, s2+2, len2-4);
1271 return strcmp(s1, s2);
1275 * Allocate a new gnu temporal attribute.
1277 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1279 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1280 attribute->kind = kind;
1281 attribute->next = NULL;
1282 attribute->invalid = false;
1283 attribute->have_arguments = false;
1289 * parse one constant expression argument.
1291 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1293 expression_t *expression;
1294 add_anchor_token(')');
1295 expression = parse_constant_expression();
1296 rem_anchor_token(')');
1298 attribute->u.argument = fold_constant(expression);
1301 attribute->invalid = true;
1305 * parse a list of constant expressions arguments.
1307 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1309 argument_list_t **list = &attribute->u.arguments;
1310 argument_list_t *entry;
1311 expression_t *expression;
1312 add_anchor_token(')');
1313 add_anchor_token(',');
1315 expression = parse_constant_expression();
1316 entry = obstack_alloc(&temp_obst, sizeof(entry));
1317 entry->argument = fold_constant(expression);
1320 list = &entry->next;
1321 if (token.type != ',')
1325 rem_anchor_token(',');
1326 rem_anchor_token(')');
1330 attribute->invalid = true;
1334 * parse one string literal argument.
1336 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1339 add_anchor_token('(');
1340 if (token.type != T_STRING_LITERAL) {
1341 parse_error_expected("while parsing attribute directive",
1342 T_STRING_LITERAL, NULL);
1345 *string = parse_string_literals();
1346 rem_anchor_token('(');
1350 attribute->invalid = true;
1354 * parse one tls model.
1356 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1358 static const char *const tls_models[] = {
1364 string_t string = { NULL, 0 };
1365 parse_gnu_attribute_string_arg(attribute, &string);
1366 if (string.begin != NULL) {
1367 for (size_t i = 0; i < 4; ++i) {
1368 if (strcmp(tls_models[i], string.begin) == 0) {
1369 attribute->u.value = i;
1373 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1375 attribute->invalid = true;
1379 * parse one tls model.
1381 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1383 static const char *const visibilities[] = {
1389 string_t string = { NULL, 0 };
1390 parse_gnu_attribute_string_arg(attribute, &string);
1391 if (string.begin != NULL) {
1392 for (size_t i = 0; i < 4; ++i) {
1393 if (strcmp(visibilities[i], string.begin) == 0) {
1394 attribute->u.value = i;
1398 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1400 attribute->invalid = true;
1404 * parse one (code) model.
1406 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1408 static const char *const visibilities[] = {
1413 string_t string = { NULL, 0 };
1414 parse_gnu_attribute_string_arg(attribute, &string);
1415 if (string.begin != NULL) {
1416 for (int i = 0; i < 3; ++i) {
1417 if (strcmp(visibilities[i], string.begin) == 0) {
1418 attribute->u.value = i;
1422 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1424 attribute->invalid = true;
1427 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1429 /* TODO: find out what is allowed here... */
1431 /* at least: byte, word, pointer, list of machine modes
1432 * __XXX___ is interpreted as XXX */
1433 add_anchor_token(')');
1435 if (token.type != T_IDENTIFIER) {
1436 expect(T_IDENTIFIER);
1439 /* This isn't really correct, the backend should provide a list of machine
1440 * specific modes (according to gcc philosophy that is...) */
1441 const char *symbol_str = token.v.symbol->string;
1442 if (strcmp_underscore("QI", symbol_str) == 0 ||
1443 strcmp_underscore("byte", symbol_str) == 0) {
1444 attribute->u.akind = ATOMIC_TYPE_CHAR;
1445 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1446 attribute->u.akind = ATOMIC_TYPE_SHORT;
1447 } else if (strcmp_underscore("SI", symbol_str) == 0
1448 || strcmp_underscore("word", symbol_str) == 0
1449 || strcmp_underscore("pointer", symbol_str) == 0) {
1450 attribute->u.akind = ATOMIC_TYPE_INT;
1451 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1452 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1455 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1456 attribute->invalid = true;
1460 rem_anchor_token(')');
1464 attribute->invalid = true;
1468 * parse one interrupt argument.
1470 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1472 static const char *const interrupts[] = {
1479 string_t string = { NULL, 0 };
1480 parse_gnu_attribute_string_arg(attribute, &string);
1481 if (string.begin != NULL) {
1482 for (size_t i = 0; i < 5; ++i) {
1483 if (strcmp(interrupts[i], string.begin) == 0) {
1484 attribute->u.value = i;
1488 errorf(HERE, "'%s' is not an interrupt", string.begin);
1490 attribute->invalid = true;
1494 * parse ( identifier, const expression, const expression )
1496 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1498 static const char *const format_names[] = {
1506 if (token.type != T_IDENTIFIER) {
1507 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1510 const char *name = token.v.symbol->string;
1511 for (i = 0; i < 4; ++i) {
1512 if (strcmp_underscore(format_names[i], name) == 0)
1516 if (warning.attribute)
1517 warningf(HERE, "'%s' is an unrecognized format function type", name);
1522 add_anchor_token(')');
1523 add_anchor_token(',');
1524 parse_constant_expression();
1525 rem_anchor_token(',');
1526 rem_anchor_token(')');
1529 add_anchor_token(')');
1530 parse_constant_expression();
1531 rem_anchor_token(')');
1535 attribute->u.value = true;
1538 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1540 if (!attribute->have_arguments)
1543 /* should have no arguments */
1544 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1545 eat_until_matching_token('(');
1546 /* we have already consumed '(', so we stop before ')', eat it */
1548 attribute->invalid = true;
1552 * Parse one GNU attribute.
1554 * Note that attribute names can be specified WITH or WITHOUT
1555 * double underscores, ie const or __const__.
1557 * The following attributes are parsed without arguments
1582 * no_instrument_function
1583 * warn_unused_result
1600 * externally_visible
1608 * The following attributes are parsed with arguments
1609 * aligned( const expression )
1610 * alias( string literal )
1611 * section( string literal )
1612 * format( identifier, const expression, const expression )
1613 * format_arg( const expression )
1614 * tls_model( string literal )
1615 * visibility( string literal )
1616 * regparm( const expression )
1617 * model( string leteral )
1618 * trap_exit( const expression )
1619 * sp_switch( string literal )
1621 * The following attributes might have arguments
1622 * weak_ref( string literal )
1623 * non_null( const expression // ',' )
1624 * interrupt( string literal )
1625 * sentinel( constant expression )
1627 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1629 gnu_attribute_t *head = *attributes;
1630 gnu_attribute_t *last = *attributes;
1631 decl_modifiers_t modifiers = 0;
1632 gnu_attribute_t *attribute;
1634 eat(T___attribute__);
1638 if (token.type != ')') {
1639 /* find the end of the list */
1641 while (last->next != NULL)
1645 /* non-empty attribute list */
1648 if (token.type == T_const) {
1650 } else if (token.type == T_volatile) {
1652 } else if (token.type == T_cdecl) {
1653 /* __attribute__((cdecl)), WITH ms mode */
1655 } else if (token.type == T_IDENTIFIER) {
1656 const symbol_t *sym = token.v.symbol;
1659 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1666 for (i = 0; i < GNU_AK_LAST; ++i) {
1667 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1670 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1673 if (kind == GNU_AK_LAST) {
1674 if (warning.attribute)
1675 warningf(HERE, "'%s' attribute directive ignored", name);
1677 /* skip possible arguments */
1678 if (token.type == '(') {
1679 eat_until_matching_token(')');
1682 /* check for arguments */
1683 attribute = allocate_gnu_attribute(kind);
1684 if (token.type == '(') {
1686 if (token.type == ')') {
1687 /* empty args are allowed */
1690 attribute->have_arguments = true;
1694 case GNU_AK_VOLATILE:
1699 case GNU_AK_NOCOMMON:
1701 case GNU_AK_NOTSHARED:
1702 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1703 case GNU_AK_WARN_UNUSED_RESULT:
1704 case GNU_AK_LONGCALL:
1705 case GNU_AK_SHORTCALL:
1706 case GNU_AK_LONG_CALL:
1707 case GNU_AK_SHORT_CALL:
1708 case GNU_AK_FUNCTION_VECTOR:
1709 case GNU_AK_INTERRUPT_HANDLER:
1710 case GNU_AK_NMI_HANDLER:
1711 case GNU_AK_NESTING:
1715 case GNU_AK_EIGTHBIT_DATA:
1716 case GNU_AK_TINY_DATA:
1717 case GNU_AK_SAVEALL:
1718 case GNU_AK_FLATTEN:
1719 case GNU_AK_SSEREGPARM:
1720 case GNU_AK_EXTERNALLY_VISIBLE:
1721 case GNU_AK_RETURN_TWICE:
1722 case GNU_AK_MAY_ALIAS:
1723 case GNU_AK_MS_STRUCT:
1724 case GNU_AK_GCC_STRUCT:
1727 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1728 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1729 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1730 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1731 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1732 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1733 case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg;
1734 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1735 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1736 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1737 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1738 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1739 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1740 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1741 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1742 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1743 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1744 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1746 case GNU_AK_ALIGNED:
1747 /* __align__ may be used without an argument */
1748 if (attribute->have_arguments) {
1749 parse_gnu_attribute_const_arg(attribute);
1753 case GNU_AK_FORMAT_ARG:
1754 case GNU_AK_REGPARM:
1755 case GNU_AK_TRAP_EXIT:
1756 if (!attribute->have_arguments) {
1757 /* should have arguments */
1758 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1759 attribute->invalid = true;
1761 parse_gnu_attribute_const_arg(attribute);
1764 case GNU_AK_SECTION:
1765 case GNU_AK_SP_SWITCH:
1766 if (!attribute->have_arguments) {
1767 /* should have arguments */
1768 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1769 attribute->invalid = true;
1771 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1774 if (!attribute->have_arguments) {
1775 /* should have arguments */
1776 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1777 attribute->invalid = true;
1779 parse_gnu_attribute_format_args(attribute);
1781 case GNU_AK_WEAKREF:
1782 /* may have one string argument */
1783 if (attribute->have_arguments)
1784 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1786 case GNU_AK_NONNULL:
1787 if (attribute->have_arguments)
1788 parse_gnu_attribute_const_arg_list(attribute);
1790 case GNU_AK_TLS_MODEL:
1791 if (!attribute->have_arguments) {
1792 /* should have arguments */
1793 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1795 parse_gnu_attribute_tls_model_arg(attribute);
1797 case GNU_AK_VISIBILITY:
1798 if (!attribute->have_arguments) {
1799 /* should have arguments */
1800 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1802 parse_gnu_attribute_visibility_arg(attribute);
1805 if (!attribute->have_arguments) {
1806 /* should have arguments */
1807 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1809 parse_gnu_attribute_model_arg(attribute);
1813 if (!attribute->have_arguments) {
1814 /* should have arguments */
1815 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1817 parse_gnu_attribute_mode_arg(attribute);
1820 case GNU_AK_INTERRUPT:
1821 /* may have one string argument */
1822 if (attribute->have_arguments)
1823 parse_gnu_attribute_interrupt_arg(attribute);
1825 case GNU_AK_SENTINEL:
1826 /* may have one string argument */
1827 if (attribute->have_arguments)
1828 parse_gnu_attribute_const_arg(attribute);
1831 /* already handled */
1835 check_no_argument(attribute, name);
1838 if (attribute != NULL) {
1840 last->next = attribute;
1843 head = last = attribute;
1847 if (token.type != ',')
1861 * Parse GNU attributes.
1863 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1865 decl_modifiers_t modifiers = 0;
1868 switch (token.type) {
1869 case T___attribute__:
1870 modifiers |= parse_gnu_attribute(attributes);
1876 if (token.type != T_STRING_LITERAL) {
1877 parse_error_expected("while parsing assembler attribute",
1878 T_STRING_LITERAL, NULL);
1879 eat_until_matching_token('(');
1882 parse_string_literals();
1887 case T_cdecl: modifiers |= DM_CDECL; break;
1888 case T__fastcall: modifiers |= DM_FASTCALL; break;
1889 case T__stdcall: modifiers |= DM_STDCALL; break;
1892 /* TODO record modifier */
1894 warningf(HERE, "Ignoring declaration modifier %K", &token);
1898 default: return modifiers;
1905 static void mark_vars_read(expression_t *expr, variable_t *lhs_var);
1907 static variable_t *determine_lhs_var(expression_t *const expr,
1908 variable_t *lhs_var)
1910 switch (expr->kind) {
1911 case EXPR_REFERENCE: {
1912 entity_t *const entity = expr->reference.entity;
1913 /* we should only find variables as lavlues... */
1914 if (entity->base.kind != ENTITY_VARIABLE)
1917 return &entity->variable;
1920 case EXPR_ARRAY_ACCESS: {
1921 expression_t *const ref = expr->array_access.array_ref;
1922 variable_t * var = NULL;
1923 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1924 var = determine_lhs_var(ref, lhs_var);
1927 mark_vars_read(expr->select.compound, lhs_var);
1929 mark_vars_read(expr->array_access.index, lhs_var);
1934 if (is_type_compound(skip_typeref(expr->base.type))) {
1935 return determine_lhs_var(expr->select.compound, lhs_var);
1937 mark_vars_read(expr->select.compound, lhs_var);
1942 case EXPR_UNARY_DEREFERENCE: {
1943 expression_t *const val = expr->unary.value;
1944 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1946 return determine_lhs_var(val->unary.value, lhs_var);
1948 mark_vars_read(val, NULL);
1954 mark_vars_read(expr, NULL);
1959 #define VAR_ANY ((variable_t*)-1)
1962 * Mark declarations, which are read. This is used to deted variables, which
1966 * x is not marked as "read", because it is only read to calculate its own new
1970 * x and y are not detected as "not read", because multiple variables are
1973 static void mark_vars_read(expression_t *const expr, variable_t *lhs_var)
1975 switch (expr->kind) {
1976 case EXPR_REFERENCE: {
1977 entity_t *const entity = expr->reference.entity;
1978 if (entity->kind != ENTITY_VARIABLE)
1981 variable_t *variable = &entity->variable;
1982 if (lhs_var != variable && lhs_var != VAR_ANY) {
1983 variable->read = true;
1989 // TODO respect pure/const
1990 mark_vars_read(expr->call.function, NULL);
1991 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
1992 mark_vars_read(arg->expression, NULL);
1996 case EXPR_CONDITIONAL:
1997 // TODO lhs_decl should depend on whether true/false have an effect
1998 mark_vars_read(expr->conditional.condition, NULL);
1999 if (expr->conditional.true_expression != NULL)
2000 mark_vars_read(expr->conditional.true_expression, lhs_var);
2001 mark_vars_read(expr->conditional.false_expression, lhs_var);
2005 if (lhs_var == VAR_ANY && !is_type_compound(skip_typeref(expr->base.type)))
2007 mark_vars_read(expr->select.compound, lhs_var);
2010 case EXPR_ARRAY_ACCESS: {
2011 expression_t *const ref = expr->array_access.array_ref;
2012 mark_vars_read(ref, lhs_var);
2013 lhs_var = determine_lhs_var(ref, lhs_var);
2014 mark_vars_read(expr->array_access.index, lhs_var);
2019 mark_vars_read(expr->va_arge.ap, lhs_var);
2022 case EXPR_UNARY_CAST:
2023 /* Special case: Use void cast to mark a variable as "read" */
2024 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
2029 case EXPR_UNARY_THROW:
2030 if (expr->unary.value == NULL)
2033 case EXPR_UNARY_DEREFERENCE:
2034 case EXPR_UNARY_DELETE:
2035 case EXPR_UNARY_DELETE_ARRAY:
2036 if (lhs_var == VAR_ANY)
2040 case EXPR_UNARY_NEGATE:
2041 case EXPR_UNARY_PLUS:
2042 case EXPR_UNARY_BITWISE_NEGATE:
2043 case EXPR_UNARY_NOT:
2044 case EXPR_UNARY_TAKE_ADDRESS:
2045 case EXPR_UNARY_POSTFIX_INCREMENT:
2046 case EXPR_UNARY_POSTFIX_DECREMENT:
2047 case EXPR_UNARY_PREFIX_INCREMENT:
2048 case EXPR_UNARY_PREFIX_DECREMENT:
2049 case EXPR_UNARY_CAST_IMPLICIT:
2050 case EXPR_UNARY_ASSUME:
2052 mark_vars_read(expr->unary.value, lhs_var);
2055 case EXPR_BINARY_ADD:
2056 case EXPR_BINARY_SUB:
2057 case EXPR_BINARY_MUL:
2058 case EXPR_BINARY_DIV:
2059 case EXPR_BINARY_MOD:
2060 case EXPR_BINARY_EQUAL:
2061 case EXPR_BINARY_NOTEQUAL:
2062 case EXPR_BINARY_LESS:
2063 case EXPR_BINARY_LESSEQUAL:
2064 case EXPR_BINARY_GREATER:
2065 case EXPR_BINARY_GREATEREQUAL:
2066 case EXPR_BINARY_BITWISE_AND:
2067 case EXPR_BINARY_BITWISE_OR:
2068 case EXPR_BINARY_BITWISE_XOR:
2069 case EXPR_BINARY_LOGICAL_AND:
2070 case EXPR_BINARY_LOGICAL_OR:
2071 case EXPR_BINARY_SHIFTLEFT:
2072 case EXPR_BINARY_SHIFTRIGHT:
2073 case EXPR_BINARY_COMMA:
2074 case EXPR_BINARY_ISGREATER:
2075 case EXPR_BINARY_ISGREATEREQUAL:
2076 case EXPR_BINARY_ISLESS:
2077 case EXPR_BINARY_ISLESSEQUAL:
2078 case EXPR_BINARY_ISLESSGREATER:
2079 case EXPR_BINARY_ISUNORDERED:
2080 mark_vars_read(expr->binary.left, lhs_var);
2081 mark_vars_read(expr->binary.right, lhs_var);
2084 case EXPR_BINARY_ASSIGN:
2085 case EXPR_BINARY_MUL_ASSIGN:
2086 case EXPR_BINARY_DIV_ASSIGN:
2087 case EXPR_BINARY_MOD_ASSIGN:
2088 case EXPR_BINARY_ADD_ASSIGN:
2089 case EXPR_BINARY_SUB_ASSIGN:
2090 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2091 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2092 case EXPR_BINARY_BITWISE_AND_ASSIGN:
2093 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2094 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
2095 if (lhs_var == VAR_ANY)
2097 lhs_var = determine_lhs_var(expr->binary.left, lhs_var);
2098 mark_vars_read(expr->binary.right, lhs_var);
2103 determine_lhs_var(expr->va_starte.ap, lhs_var);
2109 case EXPR_CHARACTER_CONSTANT:
2110 case EXPR_WIDE_CHARACTER_CONSTANT:
2111 case EXPR_STRING_LITERAL:
2112 case EXPR_WIDE_STRING_LITERAL:
2113 case EXPR_COMPOUND_LITERAL: // TODO init?
2115 case EXPR_CLASSIFY_TYPE:
2118 case EXPR_BUILTIN_SYMBOL:
2119 case EXPR_BUILTIN_CONSTANT_P:
2120 case EXPR_BUILTIN_PREFETCH:
2122 case EXPR_STATEMENT: // TODO
2123 case EXPR_LABEL_ADDRESS:
2124 case EXPR_BINARY_BUILTIN_EXPECT:
2125 case EXPR_REFERENCE_ENUM_VALUE:
2129 panic("unhandled expression");
2132 static designator_t *parse_designation(void)
2134 designator_t *result = NULL;
2135 designator_t *last = NULL;
2138 designator_t *designator;
2139 switch (token.type) {
2141 designator = allocate_ast_zero(sizeof(designator[0]));
2142 designator->source_position = token.source_position;
2144 add_anchor_token(']');
2145 designator->array_index = parse_constant_expression();
2146 rem_anchor_token(']');
2150 designator = allocate_ast_zero(sizeof(designator[0]));
2151 designator->source_position = token.source_position;
2153 if (token.type != T_IDENTIFIER) {
2154 parse_error_expected("while parsing designator",
2155 T_IDENTIFIER, NULL);
2158 designator->symbol = token.v.symbol;
2166 assert(designator != NULL);
2168 last->next = designator;
2170 result = designator;
2178 static initializer_t *initializer_from_string(array_type_t *type,
2179 const string_t *const string)
2181 /* TODO: check len vs. size of array type */
2184 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
2185 initializer->string.string = *string;
2190 static initializer_t *initializer_from_wide_string(array_type_t *const type,
2191 wide_string_t *const string)
2193 /* TODO: check len vs. size of array type */
2196 initializer_t *const initializer =
2197 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
2198 initializer->wide_string.string = *string;
2204 * Build an initializer from a given expression.
2206 static initializer_t *initializer_from_expression(type_t *orig_type,
2207 expression_t *expression)
2209 /* TODO check that expression is a constant expression */
2211 /* § 6.7.8.14/15 char array may be initialized by string literals */
2212 type_t *type = skip_typeref(orig_type);
2213 type_t *expr_type_orig = expression->base.type;
2214 type_t *expr_type = skip_typeref(expr_type_orig);
2215 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
2216 array_type_t *const array_type = &type->array;
2217 type_t *const element_type = skip_typeref(array_type->element_type);
2219 if (element_type->kind == TYPE_ATOMIC) {
2220 atomic_type_kind_t akind = element_type->atomic.akind;
2221 switch (expression->kind) {
2222 case EXPR_STRING_LITERAL:
2223 if (akind == ATOMIC_TYPE_CHAR
2224 || akind == ATOMIC_TYPE_SCHAR
2225 || akind == ATOMIC_TYPE_UCHAR) {
2226 return initializer_from_string(array_type,
2227 &expression->string.value);
2230 case EXPR_WIDE_STRING_LITERAL: {
2231 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
2232 if (get_unqualified_type(element_type) == bare_wchar_type) {
2233 return initializer_from_wide_string(array_type,
2234 &expression->wide_string.value);
2244 assign_error_t error = semantic_assign(type, expression);
2245 if (error == ASSIGN_ERROR_INCOMPATIBLE)
2247 report_assign_error(error, type, expression, "initializer",
2248 &expression->base.source_position);
2250 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2252 if (type->kind == TYPE_BITFIELD) {
2253 type = type->bitfield.base_type;
2256 result->value.value = create_implicit_cast(expression, type);
2262 * Checks if a given expression can be used as an constant initializer.
2264 static bool is_initializer_constant(const expression_t *expression)
2266 return is_constant_expression(expression)
2267 || is_address_constant(expression);
2271 * Parses an scalar initializer.
2273 * § 6.7.8.11; eat {} without warning
2275 static initializer_t *parse_scalar_initializer(type_t *type,
2276 bool must_be_constant)
2278 /* there might be extra {} hierarchies */
2280 if (token.type == '{') {
2282 warningf(HERE, "extra curly braces around scalar initializer");
2286 } while (token.type == '{');
2289 expression_t *expression = parse_assignment_expression();
2290 mark_vars_read(expression, NULL);
2291 if (must_be_constant && !is_initializer_constant(expression)) {
2292 errorf(&expression->base.source_position,
2293 "Initialisation expression '%E' is not constant\n",
2297 initializer_t *initializer = initializer_from_expression(type, expression);
2299 if (initializer == NULL) {
2300 errorf(&expression->base.source_position,
2301 "expression '%E' (type '%T') doesn't match expected type '%T'",
2302 expression, expression->base.type, type);
2307 bool additional_warning_displayed = false;
2308 while (braces > 0) {
2309 if (token.type == ',') {
2312 if (token.type != '}') {
2313 if (!additional_warning_displayed && warning.other) {
2314 warningf(HERE, "additional elements in scalar initializer");
2315 additional_warning_displayed = true;
2326 * An entry in the type path.
2328 typedef struct type_path_entry_t type_path_entry_t;
2329 struct type_path_entry_t {
2330 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2332 size_t index; /**< For array types: the current index. */
2333 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2338 * A type path expression a position inside compound or array types.
2340 typedef struct type_path_t type_path_t;
2341 struct type_path_t {
2342 type_path_entry_t *path; /**< An flexible array containing the current path. */
2343 type_t *top_type; /**< type of the element the path points */
2344 size_t max_index; /**< largest index in outermost array */
2348 * Prints a type path for debugging.
2350 static __attribute__((unused)) void debug_print_type_path(
2351 const type_path_t *path)
2353 size_t len = ARR_LEN(path->path);
2355 for (size_t i = 0; i < len; ++i) {
2356 const type_path_entry_t *entry = & path->path[i];
2358 type_t *type = skip_typeref(entry->type);
2359 if (is_type_compound(type)) {
2360 /* in gcc mode structs can have no members */
2361 if (entry->v.compound_entry == NULL) {
2365 fprintf(stderr, ".%s",
2366 entry->v.compound_entry->base.symbol->string);
2367 } else if (is_type_array(type)) {
2368 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
2370 fprintf(stderr, "-INVALID-");
2373 if (path->top_type != NULL) {
2374 fprintf(stderr, " (");
2375 print_type(path->top_type);
2376 fprintf(stderr, ")");
2381 * Return the top type path entry, ie. in a path
2382 * (type).a.b returns the b.
2384 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2386 size_t len = ARR_LEN(path->path);
2388 return &path->path[len-1];
2392 * Enlarge the type path by an (empty) element.
2394 static type_path_entry_t *append_to_type_path(type_path_t *path)
2396 size_t len = ARR_LEN(path->path);
2397 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2399 type_path_entry_t *result = & path->path[len];
2400 memset(result, 0, sizeof(result[0]));
2405 * Descending into a sub-type. Enter the scope of the current top_type.
2407 static void descend_into_subtype(type_path_t *path)
2409 type_t *orig_top_type = path->top_type;
2410 type_t *top_type = skip_typeref(orig_top_type);
2412 type_path_entry_t *top = append_to_type_path(path);
2413 top->type = top_type;
2415 if (is_type_compound(top_type)) {
2416 compound_t *compound = top_type->compound.compound;
2417 entity_t *entry = compound->members.entities;
2419 if (entry != NULL) {
2420 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2421 top->v.compound_entry = &entry->declaration;
2422 path->top_type = entry->declaration.type;
2424 path->top_type = NULL;
2426 } else if (is_type_array(top_type)) {
2428 path->top_type = top_type->array.element_type;
2430 assert(!is_type_valid(top_type));
2435 * Pop an entry from the given type path, ie. returning from
2436 * (type).a.b to (type).a
2438 static void ascend_from_subtype(type_path_t *path)
2440 type_path_entry_t *top = get_type_path_top(path);
2442 path->top_type = top->type;
2444 size_t len = ARR_LEN(path->path);
2445 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2449 * Pop entries from the given type path until the given
2450 * path level is reached.
2452 static void ascend_to(type_path_t *path, size_t top_path_level)
2454 size_t len = ARR_LEN(path->path);
2456 while (len > top_path_level) {
2457 ascend_from_subtype(path);
2458 len = ARR_LEN(path->path);
2462 static bool walk_designator(type_path_t *path, const designator_t *designator,
2463 bool used_in_offsetof)
2465 for (; designator != NULL; designator = designator->next) {
2466 type_path_entry_t *top = get_type_path_top(path);
2467 type_t *orig_type = top->type;
2469 type_t *type = skip_typeref(orig_type);
2471 if (designator->symbol != NULL) {
2472 symbol_t *symbol = designator->symbol;
2473 if (!is_type_compound(type)) {
2474 if (is_type_valid(type)) {
2475 errorf(&designator->source_position,
2476 "'.%Y' designator used for non-compound type '%T'",
2480 top->type = type_error_type;
2481 top->v.compound_entry = NULL;
2482 orig_type = type_error_type;
2484 compound_t *compound = type->compound.compound;
2485 entity_t *iter = compound->members.entities;
2486 for (; iter != NULL; iter = iter->base.next) {
2487 if (iter->base.symbol == symbol) {
2492 errorf(&designator->source_position,
2493 "'%T' has no member named '%Y'", orig_type, symbol);
2496 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2497 if (used_in_offsetof) {
2498 type_t *real_type = skip_typeref(iter->declaration.type);
2499 if (real_type->kind == TYPE_BITFIELD) {
2500 errorf(&designator->source_position,
2501 "offsetof designator '%Y' may not specify bitfield",
2507 top->type = orig_type;
2508 top->v.compound_entry = &iter->declaration;
2509 orig_type = iter->declaration.type;
2512 expression_t *array_index = designator->array_index;
2513 assert(designator->array_index != NULL);
2515 if (!is_type_array(type)) {
2516 if (is_type_valid(type)) {
2517 errorf(&designator->source_position,
2518 "[%E] designator used for non-array type '%T'",
2519 array_index, orig_type);
2524 long index = fold_constant(array_index);
2525 if (!used_in_offsetof) {
2527 errorf(&designator->source_position,
2528 "array index [%E] must be positive", array_index);
2529 } else if (type->array.size_constant) {
2530 long array_size = type->array.size;
2531 if (index >= array_size) {
2532 errorf(&designator->source_position,
2533 "designator [%E] (%d) exceeds array size %d",
2534 array_index, index, array_size);
2539 top->type = orig_type;
2540 top->v.index = (size_t) index;
2541 orig_type = type->array.element_type;
2543 path->top_type = orig_type;
2545 if (designator->next != NULL) {
2546 descend_into_subtype(path);
2555 static void advance_current_object(type_path_t *path, size_t top_path_level)
2557 type_path_entry_t *top = get_type_path_top(path);
2559 type_t *type = skip_typeref(top->type);
2560 if (is_type_union(type)) {
2561 /* in unions only the first element is initialized */
2562 top->v.compound_entry = NULL;
2563 } else if (is_type_struct(type)) {
2564 declaration_t *entry = top->v.compound_entry;
2566 entity_t *next_entity = entry->base.next;
2567 if (next_entity != NULL) {
2568 assert(is_declaration(next_entity));
2569 entry = &next_entity->declaration;
2574 top->v.compound_entry = entry;
2575 if (entry != NULL) {
2576 path->top_type = entry->type;
2579 } else if (is_type_array(type)) {
2580 assert(is_type_array(type));
2584 if (!type->array.size_constant || top->v.index < type->array.size) {
2588 assert(!is_type_valid(type));
2592 /* we're past the last member of the current sub-aggregate, try if we
2593 * can ascend in the type hierarchy and continue with another subobject */
2594 size_t len = ARR_LEN(path->path);
2596 if (len > top_path_level) {
2597 ascend_from_subtype(path);
2598 advance_current_object(path, top_path_level);
2600 path->top_type = NULL;
2605 * skip until token is found.
2607 static void skip_until(int type)
2609 while (token.type != type) {
2610 if (token.type == T_EOF)
2617 * skip any {...} blocks until a closing bracket is reached.
2619 static void skip_initializers(void)
2621 if (token.type == '{')
2624 while (token.type != '}') {
2625 if (token.type == T_EOF)
2627 if (token.type == '{') {
2635 static initializer_t *create_empty_initializer(void)
2637 static initializer_t empty_initializer
2638 = { .list = { { INITIALIZER_LIST }, 0 } };
2639 return &empty_initializer;
2643 * Parse a part of an initialiser for a struct or union,
2645 static initializer_t *parse_sub_initializer(type_path_t *path,
2646 type_t *outer_type, size_t top_path_level,
2647 parse_initializer_env_t *env)
2649 if (token.type == '}') {
2650 /* empty initializer */
2651 return create_empty_initializer();
2654 type_t *orig_type = path->top_type;
2655 type_t *type = NULL;
2657 if (orig_type == NULL) {
2658 /* We are initializing an empty compound. */
2660 type = skip_typeref(orig_type);
2663 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2666 designator_t *designator = NULL;
2667 if (token.type == '.' || token.type == '[') {
2668 designator = parse_designation();
2669 goto finish_designator;
2670 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2671 /* GNU-style designator ("identifier: value") */
2672 designator = allocate_ast_zero(sizeof(designator[0]));
2673 designator->source_position = token.source_position;
2674 designator->symbol = token.v.symbol;
2679 /* reset path to toplevel, evaluate designator from there */
2680 ascend_to(path, top_path_level);
2681 if (!walk_designator(path, designator, false)) {
2682 /* can't continue after designation error */
2686 initializer_t *designator_initializer
2687 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2688 designator_initializer->designator.designator = designator;
2689 ARR_APP1(initializer_t*, initializers, designator_initializer);
2691 orig_type = path->top_type;
2692 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2697 if (token.type == '{') {
2698 if (type != NULL && is_type_scalar(type)) {
2699 sub = parse_scalar_initializer(type, env->must_be_constant);
2703 if (env->entity != NULL) {
2705 "extra brace group at end of initializer for '%Y'",
2706 env->entity->base.symbol);
2708 errorf(HERE, "extra brace group at end of initializer");
2711 descend_into_subtype(path);
2713 add_anchor_token('}');
2714 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2716 rem_anchor_token('}');
2719 ascend_from_subtype(path);
2723 goto error_parse_next;
2727 /* must be an expression */
2728 expression_t *expression = parse_assignment_expression();
2730 if (env->must_be_constant && !is_initializer_constant(expression)) {
2731 errorf(&expression->base.source_position,
2732 "Initialisation expression '%E' is not constant\n",
2737 /* we are already outside, ... */
2738 type_t *const outer_type_skip = skip_typeref(outer_type);
2739 if (is_type_compound(outer_type_skip) &&
2740 !outer_type_skip->compound.compound->complete) {
2741 goto error_parse_next;
2746 /* handle { "string" } special case */
2747 if ((expression->kind == EXPR_STRING_LITERAL
2748 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2749 && outer_type != NULL) {
2750 sub = initializer_from_expression(outer_type, expression);
2752 if (token.type == ',') {
2755 if (token.type != '}' && warning.other) {
2756 warningf(HERE, "excessive elements in initializer for type '%T'",
2759 /* TODO: eat , ... */
2764 /* descend into subtypes until expression matches type */
2766 orig_type = path->top_type;
2767 type = skip_typeref(orig_type);
2769 sub = initializer_from_expression(orig_type, expression);
2773 if (!is_type_valid(type)) {
2776 if (is_type_scalar(type)) {
2777 errorf(&expression->base.source_position,
2778 "expression '%E' doesn't match expected type '%T'",
2779 expression, orig_type);
2783 descend_into_subtype(path);
2787 /* update largest index of top array */
2788 const type_path_entry_t *first = &path->path[0];
2789 type_t *first_type = first->type;
2790 first_type = skip_typeref(first_type);
2791 if (is_type_array(first_type)) {
2792 size_t index = first->v.index;
2793 if (index > path->max_index)
2794 path->max_index = index;
2798 /* append to initializers list */
2799 ARR_APP1(initializer_t*, initializers, sub);
2802 if (warning.other) {
2803 if (env->entity != NULL) {
2804 warningf(HERE, "excess elements in struct initializer for '%Y'",
2805 env->entity->base.symbol);
2807 warningf(HERE, "excess elements in struct initializer");
2813 if (token.type == '}') {
2817 if (token.type == '}') {
2822 /* advance to the next declaration if we are not at the end */
2823 advance_current_object(path, top_path_level);
2824 orig_type = path->top_type;
2825 if (orig_type != NULL)
2826 type = skip_typeref(orig_type);
2832 size_t len = ARR_LEN(initializers);
2833 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2834 initializer_t *result = allocate_ast_zero(size);
2835 result->kind = INITIALIZER_LIST;
2836 result->list.len = len;
2837 memcpy(&result->list.initializers, initializers,
2838 len * sizeof(initializers[0]));
2840 DEL_ARR_F(initializers);
2841 ascend_to(path, top_path_level+1);
2846 skip_initializers();
2847 DEL_ARR_F(initializers);
2848 ascend_to(path, top_path_level+1);
2853 * Parses an initializer. Parsers either a compound literal
2854 * (env->declaration == NULL) or an initializer of a declaration.
2856 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2858 type_t *type = skip_typeref(env->type);
2859 initializer_t *result = NULL;
2862 if (is_type_scalar(type)) {
2863 result = parse_scalar_initializer(type, env->must_be_constant);
2864 } else if (token.type == '{') {
2868 memset(&path, 0, sizeof(path));
2869 path.top_type = env->type;
2870 path.path = NEW_ARR_F(type_path_entry_t, 0);
2872 descend_into_subtype(&path);
2874 add_anchor_token('}');
2875 result = parse_sub_initializer(&path, env->type, 1, env);
2876 rem_anchor_token('}');
2878 max_index = path.max_index;
2879 DEL_ARR_F(path.path);
2883 /* parse_scalar_initializer() also works in this case: we simply
2884 * have an expression without {} around it */
2885 result = parse_scalar_initializer(type, env->must_be_constant);
2888 /* § 6.7.8 (22) array initializers for arrays with unknown size determine
2889 * the array type size */
2890 if (is_type_array(type) && type->array.size_expression == NULL
2891 && result != NULL) {
2893 switch (result->kind) {
2894 case INITIALIZER_LIST:
2895 size = max_index + 1;
2898 case INITIALIZER_STRING:
2899 size = result->string.string.size;
2902 case INITIALIZER_WIDE_STRING:
2903 size = result->wide_string.string.size;
2906 case INITIALIZER_DESIGNATOR:
2907 case INITIALIZER_VALUE:
2908 /* can happen for parse errors */
2913 internal_errorf(HERE, "invalid initializer type");
2916 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2917 cnst->base.type = type_size_t;
2918 cnst->conste.v.int_value = size;
2920 type_t *new_type = duplicate_type(type);
2922 new_type->array.size_expression = cnst;
2923 new_type->array.size_constant = true;
2924 new_type->array.has_implicit_size = true;
2925 new_type->array.size = size;
2926 env->type = new_type;
2934 static void append_entity(scope_t *scope, entity_t *entity)
2936 if (scope->last_entity != NULL) {
2937 scope->last_entity->base.next = entity;
2939 scope->entities = entity;
2941 scope->last_entity = entity;
2945 static compound_t *parse_compound_type_specifier(bool is_struct)
2947 gnu_attribute_t *attributes = NULL;
2948 decl_modifiers_t modifiers = 0;
2955 symbol_t *symbol = NULL;
2956 compound_t *compound = NULL;
2958 if (token.type == T___attribute__) {
2959 modifiers |= parse_attributes(&attributes);
2962 if (token.type == T_IDENTIFIER) {
2963 symbol = token.v.symbol;
2966 namespace_tag_t const namespc =
2967 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2968 entity_t *entity = get_entity(symbol, namespc);
2969 if (entity != NULL) {
2970 assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION));
2971 compound = &entity->compound;
2972 if (compound->base.parent_scope != current_scope &&
2973 (token.type == '{' || token.type == ';')) {
2974 /* we're in an inner scope and have a definition. Override
2975 existing definition in outer scope */
2977 } else if (compound->complete && token.type == '{') {
2978 assert(symbol != NULL);
2979 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
2980 is_struct ? "struct" : "union", symbol,
2981 &compound->base.source_position);
2982 /* clear members in the hope to avoid further errors */
2983 compound->members.entities = NULL;
2986 } else if (token.type != '{') {
2988 parse_error_expected("while parsing struct type specifier",
2989 T_IDENTIFIER, '{', NULL);
2991 parse_error_expected("while parsing union type specifier",
2992 T_IDENTIFIER, '{', NULL);
2998 if (compound == NULL) {
2999 entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
3000 entity_t *entity = allocate_entity_zero(kind);
3001 compound = &entity->compound;
3003 compound->base.namespc =
3004 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
3005 compound->base.source_position = token.source_position;
3006 compound->base.symbol = symbol;
3007 compound->base.parent_scope = current_scope;
3008 if (symbol != NULL) {
3009 environment_push(entity);
3011 append_entity(current_scope, entity);
3014 if (token.type == '{') {
3015 parse_compound_type_entries(compound);
3016 modifiers |= parse_attributes(&attributes);
3018 if (symbol == NULL) {
3019 assert(anonymous_entity == NULL);
3020 anonymous_entity = (entity_t*)compound;
3024 compound->modifiers |= modifiers;
3028 static void parse_enum_entries(type_t *const enum_type)
3032 if (token.type == '}') {
3033 errorf(HERE, "empty enum not allowed");
3038 add_anchor_token('}');
3040 if (token.type != T_IDENTIFIER) {
3041 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
3043 rem_anchor_token('}');
3047 entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE);
3048 entity->enum_value.enum_type = enum_type;
3049 entity->base.symbol = token.v.symbol;
3050 entity->base.source_position = token.source_position;
3053 if (token.type == '=') {
3055 expression_t *value = parse_constant_expression();
3057 value = create_implicit_cast(value, enum_type);
3058 entity->enum_value.value = value;
3063 record_entity(entity, false);
3065 if (token.type != ',')
3068 } while (token.type != '}');
3069 rem_anchor_token('}');
3077 static type_t *parse_enum_specifier(void)
3079 gnu_attribute_t *attributes = NULL;
3084 if (token.type == T_IDENTIFIER) {
3085 symbol = token.v.symbol;
3088 entity = get_entity(symbol, NAMESPACE_ENUM);
3089 assert(entity == NULL || entity->kind == ENTITY_ENUM);
3090 } else if (token.type != '{') {
3091 parse_error_expected("while parsing enum type specifier",
3092 T_IDENTIFIER, '{', NULL);
3099 if (entity == NULL) {
3100 entity = allocate_entity_zero(ENTITY_ENUM);
3101 entity->base.namespc = NAMESPACE_ENUM;
3102 entity->base.source_position = token.source_position;
3103 entity->base.symbol = symbol;
3104 entity->base.parent_scope = current_scope;
3107 type_t *const type = allocate_type_zero(TYPE_ENUM);
3108 type->enumt.enume = &entity->enume;
3110 if (token.type == '{') {
3111 if (entity->enume.complete) {
3112 errorf(HERE, "multiple definitions of enum %Y (previous definition %P)",
3113 symbol, &entity->base.source_position);
3115 if (symbol != NULL) {
3116 environment_push(entity);
3118 append_entity(current_scope, entity);
3119 entity->enume.complete = true;
3121 parse_enum_entries(type);
3122 parse_attributes(&attributes);
3124 if (symbol == NULL) {
3125 assert(anonymous_entity == NULL);
3126 anonymous_entity = entity;
3128 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
3129 errorf(HERE, "enum %Y used before definition (incomplete enumes are a GNU extension)",
3137 * if a symbol is a typedef to another type, return true
3139 static bool is_typedef_symbol(symbol_t *symbol)
3141 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
3142 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
3145 static type_t *parse_typeof(void)
3152 add_anchor_token(')');
3154 expression_t *expression = NULL;
3156 bool old_type_prop = in_type_prop;
3157 bool old_gcc_extension = in_gcc_extension;
3158 in_type_prop = true;
3160 while (token.type == T___extension__) {
3161 /* This can be a prefix to a typename or an expression. */
3163 in_gcc_extension = true;
3165 switch (token.type) {
3167 if (is_typedef_symbol(token.v.symbol)) {
3168 type = parse_typename();
3170 expression = parse_expression();
3171 type = expression->base.type;
3176 type = parse_typename();
3180 expression = parse_expression();
3181 type = expression->base.type;
3184 in_type_prop = old_type_prop;
3185 in_gcc_extension = old_gcc_extension;
3187 rem_anchor_token(')');
3190 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
3191 typeof_type->typeoft.expression = expression;
3192 typeof_type->typeoft.typeof_type = type;
3199 typedef enum specifiers_t {
3200 SPECIFIER_SIGNED = 1 << 0,
3201 SPECIFIER_UNSIGNED = 1 << 1,
3202 SPECIFIER_LONG = 1 << 2,
3203 SPECIFIER_INT = 1 << 3,
3204 SPECIFIER_DOUBLE = 1 << 4,
3205 SPECIFIER_CHAR = 1 << 5,
3206 SPECIFIER_SHORT = 1 << 6,
3207 SPECIFIER_LONG_LONG = 1 << 7,
3208 SPECIFIER_FLOAT = 1 << 8,
3209 SPECIFIER_BOOL = 1 << 9,
3210 SPECIFIER_VOID = 1 << 10,
3211 SPECIFIER_INT8 = 1 << 11,
3212 SPECIFIER_INT16 = 1 << 12,
3213 SPECIFIER_INT32 = 1 << 13,
3214 SPECIFIER_INT64 = 1 << 14,
3215 SPECIFIER_INT128 = 1 << 15,
3216 SPECIFIER_COMPLEX = 1 << 16,
3217 SPECIFIER_IMAGINARY = 1 << 17,
3220 static type_t *create_builtin_type(symbol_t *const symbol,
3221 type_t *const real_type)
3223 type_t *type = allocate_type_zero(TYPE_BUILTIN);
3224 type->builtin.symbol = symbol;
3225 type->builtin.real_type = real_type;
3227 type_t *result = typehash_insert(type);
3228 if (type != result) {
3235 static type_t *get_typedef_type(symbol_t *symbol)
3237 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3238 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
3241 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
3242 type->typedeft.typedefe = &entity->typedefe;
3248 * check for the allowed MS alignment values.
3250 static bool check_alignment_value(long long intvalue)
3252 if (intvalue < 1 || intvalue > 8192) {
3253 errorf(HERE, "illegal alignment value");
3256 unsigned v = (unsigned)intvalue;
3257 for (unsigned i = 1; i <= 8192; i += i) {
3261 errorf(HERE, "alignment must be power of two");
3265 #define DET_MOD(name, tag) do { \
3266 if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \
3267 *modifiers |= tag; \
3270 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
3272 decl_modifiers_t *modifiers = &specifiers->modifiers;
3275 if (token.type == T_restrict) {
3277 DET_MOD(restrict, DM_RESTRICT);
3279 } else if (token.type != T_IDENTIFIER)
3281 symbol_t *symbol = token.v.symbol;
3282 if (symbol == sym_align) {
3285 if (token.type != T_INTEGER)
3287 if (check_alignment_value(token.v.intvalue)) {
3288 if (specifiers->alignment != 0 && warning.other)
3289 warningf(HERE, "align used more than once");
3290 specifiers->alignment = (unsigned char)token.v.intvalue;
3294 } else if (symbol == sym_allocate) {
3297 if (token.type != T_IDENTIFIER)
3299 (void)token.v.symbol;
3301 } else if (symbol == sym_dllimport) {
3303 DET_MOD(dllimport, DM_DLLIMPORT);
3304 } else if (symbol == sym_dllexport) {
3306 DET_MOD(dllexport, DM_DLLEXPORT);
3307 } else if (symbol == sym_thread) {
3309 DET_MOD(thread, DM_THREAD);
3310 } else if (symbol == sym_naked) {
3312 DET_MOD(naked, DM_NAKED);
3313 } else if (symbol == sym_noinline) {
3315 DET_MOD(noinline, DM_NOINLINE);
3316 } else if (symbol == sym_noreturn) {
3318 DET_MOD(noreturn, DM_NORETURN);
3319 } else if (symbol == sym_nothrow) {
3321 DET_MOD(nothrow, DM_NOTHROW);
3322 } else if (symbol == sym_novtable) {
3324 DET_MOD(novtable, DM_NOVTABLE);
3325 } else if (symbol == sym_property) {
3329 bool is_get = false;
3330 if (token.type != T_IDENTIFIER)
3332 if (token.v.symbol == sym_get) {
3334 } else if (token.v.symbol == sym_put) {
3336 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3341 if (token.type != T_IDENTIFIER)
3344 if (specifiers->get_property_sym != NULL) {
3345 errorf(HERE, "get property name already specified");
3347 specifiers->get_property_sym = token.v.symbol;
3350 if (specifiers->put_property_sym != NULL) {
3351 errorf(HERE, "put property name already specified");
3353 specifiers->put_property_sym = token.v.symbol;
3357 if (token.type == ',') {
3364 } else if (symbol == sym_selectany) {
3366 DET_MOD(selectany, DM_SELECTANY);
3367 } else if (symbol == sym_uuid) {
3370 if (token.type != T_STRING_LITERAL)
3374 } else if (symbol == sym_deprecated) {
3376 if (specifiers->deprecated != 0 && warning.other)
3377 warningf(HERE, "deprecated used more than once");
3378 specifiers->deprecated = true;
3379 if (token.type == '(') {
3381 if (token.type == T_STRING_LITERAL) {
3382 specifiers->deprecated_string = token.v.string.begin;
3385 errorf(HERE, "string literal expected");
3389 } else if (symbol == sym_noalias) {
3391 DET_MOD(noalias, DM_NOALIAS);
3394 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3396 if (token.type == '(')
3400 if (token.type == ',')
3407 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
3409 entity_t *entity = allocate_entity_zero(kind);
3410 entity->base.source_position = *HERE;
3411 entity->base.symbol = symbol;
3412 if (is_declaration(entity)) {
3413 entity->declaration.type = type_error_type;
3414 entity->declaration.implicit = true;
3415 } else if (kind == ENTITY_TYPEDEF) {
3416 entity->typedefe.type = type_error_type;
3418 record_entity(entity, false);
3422 static void parse_microsoft_based(based_spec_t *based_spec)
3424 if (token.type != T_IDENTIFIER) {
3425 parse_error_expected("while parsing __based", T_IDENTIFIER, NULL);
3428 symbol_t *symbol = token.v.symbol;
3429 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3431 if (entity == NULL || entity->base.kind != ENTITY_VARIABLE) {
3432 errorf(HERE, "'%Y' is not a variable name.", symbol);
3433 entity = create_error_entity(symbol, ENTITY_VARIABLE);
3435 variable_t *variable = &entity->variable;
3437 if (based_spec->base_variable != NULL) {
3438 errorf(HERE, "__based type qualifier specified more than once");
3440 based_spec->source_position = token.source_position;
3441 based_spec->base_variable = variable;
3443 type_t *const type = variable->base.type;
3445 if (is_type_valid(type)) {
3446 if (! is_type_pointer(skip_typeref(type))) {
3447 errorf(HERE, "variable in __based modifier must have pointer type instead of %T", type);
3449 if (variable->base.base.parent_scope != file_scope) {
3450 errorf(HERE, "a nonstatic local variable may not be used in a __based specification");
3458 * Finish the construction of a struct type by calculating
3459 * its size, offsets, alignment.
3461 static void finish_struct_type(compound_type_t *type)
3463 assert(type->compound != NULL);
3465 compound_t *compound = type->compound;
3466 if (!compound->complete)
3471 il_alignment_t alignment = 1;
3472 bool need_pad = false;
3474 entity_t *entry = compound->members.entities;
3475 for (; entry != NULL; entry = entry->base.next) {
3476 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3479 type_t *m_type = skip_typeref(entry->declaration.type);
3480 if (! is_type_valid(m_type)) {
3481 /* simply ignore errors here */
3484 il_alignment_t m_alignment = m_type->base.alignment;
3485 if (m_alignment > alignment)
3486 alignment = m_alignment;
3488 offset = (size + m_alignment - 1) & -m_alignment;
3492 entry->compound_member.offset = offset;
3493 size = offset + m_type->base.size;
3495 if (type->base.alignment != 0) {
3496 alignment = type->base.alignment;
3499 offset = (size + alignment - 1) & -alignment;
3503 if (warning.padded && need_pad) {
3504 warningf(&compound->base.source_position,
3505 "'%#T' needs padding", type, compound->base.symbol);
3507 if (warning.packed && !need_pad) {
3508 warningf(&compound->base.source_position,
3509 "superfluous packed attribute on '%#T'",
3510 type, compound->base.symbol);
3513 type->base.size = offset;
3514 type->base.alignment = alignment;
3518 * Finish the construction of an union type by calculating
3519 * its size and alignment.
3521 static void finish_union_type(compound_type_t *type)
3523 assert(type->compound != NULL);
3525 compound_t *compound = type->compound;
3526 if (! compound->complete)
3530 il_alignment_t alignment = 1;
3532 entity_t *entry = compound->members.entities;
3533 for (; entry != NULL; entry = entry->base.next) {
3534 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3537 type_t *m_type = skip_typeref(entry->declaration.type);
3538 if (! is_type_valid(m_type))
3541 entry->compound_member.offset = 0;
3542 if (m_type->base.size > size)
3543 size = m_type->base.size;
3544 if (m_type->base.alignment > alignment)
3545 alignment = m_type->base.alignment;
3547 if (type->base.alignment != 0) {
3548 alignment = type->base.alignment;
3550 size = (size + alignment - 1) & -alignment;
3551 type->base.size = size;
3552 type->base.alignment = alignment;
3555 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3557 type_t *type = NULL;
3558 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3559 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3560 unsigned type_specifiers = 0;
3561 bool newtype = false;
3562 bool saw_error = false;
3563 bool old_gcc_extension = in_gcc_extension;
3565 specifiers->source_position = token.source_position;
3568 specifiers->modifiers
3569 |= parse_attributes(&specifiers->gnu_attributes);
3570 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3571 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3573 switch (token.type) {
3575 #define MATCH_STORAGE_CLASS(token, class) \
3577 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3578 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3580 specifiers->storage_class = class; \
3581 if (specifiers->thread_local) \
3582 goto check_thread_storage_class; \
3586 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3587 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3588 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3589 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3590 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3595 add_anchor_token(')');
3596 parse_microsoft_extended_decl_modifier(specifiers);
3597 rem_anchor_token(')');
3602 if (specifiers->thread_local) {
3603 errorf(HERE, "duplicate '__thread'");
3605 specifiers->thread_local = true;
3606 check_thread_storage_class:
3607 switch (specifiers->storage_class) {
3608 case STORAGE_CLASS_EXTERN:
3609 case STORAGE_CLASS_NONE:
3610 case STORAGE_CLASS_STATIC:
3614 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3615 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3616 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3617 wrong_thread_stoarge_class:
3618 errorf(HERE, "'__thread' used with '%s'", wrong);
3625 /* type qualifiers */
3626 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3628 qualifiers |= qualifier; \
3632 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3633 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3634 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3635 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3636 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3637 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3638 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3639 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3641 case T___extension__:
3643 in_gcc_extension = true;
3646 /* type specifiers */
3647 #define MATCH_SPECIFIER(token, specifier, name) \
3649 if (type_specifiers & specifier) { \
3650 errorf(HERE, "multiple " name " type specifiers given"); \
3652 type_specifiers |= specifier; \
3657 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3658 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3659 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3660 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3661 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3662 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3663 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3664 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3665 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3666 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3667 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3668 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3669 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3670 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3671 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3672 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3673 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3675 case T__forceinline:
3676 /* only in microsoft mode */
3677 specifiers->modifiers |= DM_FORCEINLINE;
3682 specifiers->is_inline = true;
3686 if (type_specifiers & SPECIFIER_LONG_LONG) {
3687 errorf(HERE, "multiple type specifiers given");
3688 } else if (type_specifiers & SPECIFIER_LONG) {
3689 type_specifiers |= SPECIFIER_LONG_LONG;
3691 type_specifiers |= SPECIFIER_LONG;
3697 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3699 type->compound.compound = parse_compound_type_specifier(true);
3700 finish_struct_type(&type->compound);
3704 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3705 type->compound.compound = parse_compound_type_specifier(false);
3706 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3707 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3708 finish_union_type(&type->compound);
3712 type = parse_enum_specifier();
3715 type = parse_typeof();
3717 case T___builtin_va_list:
3718 type = duplicate_type(type_valist);
3722 case T_IDENTIFIER: {
3723 /* only parse identifier if we haven't found a type yet */
3724 if (type != NULL || type_specifiers != 0) {
3725 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3726 * declaration, so it doesn't generate errors about expecting '(' or
3728 switch (look_ahead(1)->type) {
3735 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3739 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3744 goto finish_specifiers;
3748 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3749 if (typedef_type == NULL) {
3750 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3751 * declaration, so it doesn't generate 'implicit int' followed by more
3752 * errors later on. */
3753 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3759 errorf(HERE, "%K does not name a type", &token);
3762 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3764 type = allocate_type_zero(TYPE_TYPEDEF);
3765 type->typedeft.typedefe = &entity->typedefe;
3769 if (la1_type == '&' || la1_type == '*')
3770 goto finish_specifiers;
3775 goto finish_specifiers;
3780 type = typedef_type;
3784 /* function specifier */
3786 goto finish_specifiers;
3791 in_gcc_extension = old_gcc_extension;
3793 if (type == NULL || (saw_error && type_specifiers != 0)) {
3794 atomic_type_kind_t atomic_type;
3796 /* match valid basic types */
3797 switch (type_specifiers) {
3798 case SPECIFIER_VOID:
3799 atomic_type = ATOMIC_TYPE_VOID;
3801 case SPECIFIER_CHAR:
3802 atomic_type = ATOMIC_TYPE_CHAR;
3804 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3805 atomic_type = ATOMIC_TYPE_SCHAR;
3807 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3808 atomic_type = ATOMIC_TYPE_UCHAR;
3810 case SPECIFIER_SHORT:
3811 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3812 case SPECIFIER_SHORT | SPECIFIER_INT:
3813 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3814 atomic_type = ATOMIC_TYPE_SHORT;
3816 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3817 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3818 atomic_type = ATOMIC_TYPE_USHORT;
3821 case SPECIFIER_SIGNED:
3822 case SPECIFIER_SIGNED | SPECIFIER_INT:
3823 atomic_type = ATOMIC_TYPE_INT;
3825 case SPECIFIER_UNSIGNED:
3826 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3827 atomic_type = ATOMIC_TYPE_UINT;
3829 case SPECIFIER_LONG:
3830 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3831 case SPECIFIER_LONG | SPECIFIER_INT:
3832 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3833 atomic_type = ATOMIC_TYPE_LONG;
3835 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3836 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3837 atomic_type = ATOMIC_TYPE_ULONG;
3840 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3841 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3842 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3843 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3845 atomic_type = ATOMIC_TYPE_LONGLONG;
3846 goto warn_about_long_long;
3848 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3849 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3851 atomic_type = ATOMIC_TYPE_ULONGLONG;
3852 warn_about_long_long:
3853 if (warning.long_long) {
3854 warningf(&specifiers->source_position,
3855 "ISO C90 does not support 'long long'");
3859 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3860 atomic_type = unsigned_int8_type_kind;
3863 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3864 atomic_type = unsigned_int16_type_kind;
3867 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3868 atomic_type = unsigned_int32_type_kind;
3871 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3872 atomic_type = unsigned_int64_type_kind;
3875 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3876 atomic_type = unsigned_int128_type_kind;
3879 case SPECIFIER_INT8:
3880 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3881 atomic_type = int8_type_kind;
3884 case SPECIFIER_INT16:
3885 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3886 atomic_type = int16_type_kind;
3889 case SPECIFIER_INT32:
3890 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3891 atomic_type = int32_type_kind;
3894 case SPECIFIER_INT64:
3895 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3896 atomic_type = int64_type_kind;
3899 case SPECIFIER_INT128:
3900 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3901 atomic_type = int128_type_kind;
3904 case SPECIFIER_FLOAT:
3905 atomic_type = ATOMIC_TYPE_FLOAT;
3907 case SPECIFIER_DOUBLE:
3908 atomic_type = ATOMIC_TYPE_DOUBLE;
3910 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3911 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3913 case SPECIFIER_BOOL:
3914 atomic_type = ATOMIC_TYPE_BOOL;
3916 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3917 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3918 atomic_type = ATOMIC_TYPE_FLOAT;
3920 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3921 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3922 atomic_type = ATOMIC_TYPE_DOUBLE;
3924 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3925 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3926 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3929 /* invalid specifier combination, give an error message */
3930 if (type_specifiers == 0) {
3934 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3935 if (!(c_mode & _CXX) && !strict_mode) {
3936 if (warning.implicit_int) {
3937 warningf(HERE, "no type specifiers in declaration, using 'int'");
3939 atomic_type = ATOMIC_TYPE_INT;
3942 errorf(HERE, "no type specifiers given in declaration");
3944 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3945 (type_specifiers & SPECIFIER_UNSIGNED)) {
3946 errorf(HERE, "signed and unsigned specifiers given");
3947 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3948 errorf(HERE, "only integer types can be signed or unsigned");
3950 errorf(HERE, "multiple datatypes in declaration");
3955 if (type_specifiers & SPECIFIER_COMPLEX) {
3956 type = allocate_type_zero(TYPE_COMPLEX);
3957 type->complex.akind = atomic_type;
3958 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3959 type = allocate_type_zero(TYPE_IMAGINARY);
3960 type->imaginary.akind = atomic_type;
3962 type = allocate_type_zero(TYPE_ATOMIC);
3963 type->atomic.akind = atomic_type;
3966 } else if (type_specifiers != 0) {
3967 errorf(HERE, "multiple datatypes in declaration");
3970 /* FIXME: check type qualifiers here */
3972 type->base.qualifiers = qualifiers;
3973 type->base.modifiers = modifiers;
3975 type_t *result = typehash_insert(type);
3976 if (newtype && result != type) {
3980 specifiers->type = result;
3984 specifiers->type = type_error_type;
3988 static type_qualifiers_t parse_type_qualifiers(void)
3990 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3993 switch (token.type) {
3994 /* type qualifiers */
3995 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3996 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3997 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3998 /* microsoft extended type modifiers */
3999 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4000 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4001 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4002 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4003 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4012 * Parses an K&R identifier list
4014 static void parse_identifier_list(scope_t *scope)
4017 entity_t *entity = allocate_entity_zero(ENTITY_VARIABLE);
4018 entity->base.source_position = token.source_position;
4019 entity->base.namespc = NAMESPACE_NORMAL;
4020 entity->base.symbol = token.v.symbol;
4021 /* a K&R parameter has no type, yet */
4024 append_entity(scope, entity);
4026 if (token.type != ',') {
4030 } while (token.type == T_IDENTIFIER);
4033 static void semantic_parameter(declaration_t *declaration)
4035 /* TODO: improve error messages */
4036 source_position_t const* const pos = &declaration->base.source_position;
4038 /* §6.9.1:6 The declarations in the declaration list shall contain no
4039 * storage-class specifier other than register and no
4040 * initializations. */
4041 switch (declaration->declared_storage_class) {
4042 /* Allowed storage classes */
4043 case STORAGE_CLASS_NONE:
4044 case STORAGE_CLASS_REGISTER:
4048 errorf(pos, "parameter may only have none or register storage class");
4052 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type list in
4053 * a function declarator that is part of a definition of that
4054 * function shall not have incomplete type. */
4055 type_t *type = declaration->type;
4056 if (is_type_incomplete(skip_typeref(type))) {
4057 errorf(pos, "parameter '%#T' has incomplete type",
4058 type, declaration->base.symbol);
4062 static entity_t *parse_parameter(void)
4064 declaration_specifiers_t specifiers;
4065 memset(&specifiers, 0, sizeof(specifiers));
4067 parse_declaration_specifiers(&specifiers);
4069 entity_t *entity = parse_declarator(&specifiers,
4070 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4071 anonymous_entity = NULL;
4076 * Parses function type parameters (and optionally creates variable_t entities
4077 * for them in a scope)
4079 static void parse_parameters(function_type_t *type, scope_t *scope)
4082 add_anchor_token(')');
4083 int saved_comma_state = save_and_reset_anchor_state(',');
4085 if (token.type == T_IDENTIFIER &&
4086 !is_typedef_symbol(token.v.symbol)) {
4087 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4088 if (la1_type == ',' || la1_type == ')') {
4089 type->kr_style_parameters = true;
4090 parse_identifier_list(scope);
4091 goto parameters_finished;
4095 if (token.type == ')') {
4096 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4097 if (!(c_mode & _CXX))
4098 type->unspecified_parameters = true;
4099 goto parameters_finished;
4102 function_parameter_t *parameter;
4103 function_parameter_t *last_parameter = NULL;
4106 switch (token.type) {
4109 type->variadic = true;
4110 goto parameters_finished;
4113 case T___extension__:
4116 entity_t *entity = parse_parameter();
4117 if (entity->kind == ENTITY_TYPEDEF) {
4118 errorf(&entity->base.source_position,
4119 "typedef not allowed as function parameter");
4122 assert(is_declaration(entity));
4124 /* func(void) is not a parameter */
4125 if (last_parameter == NULL
4126 && token.type == ')'
4127 && entity->base.symbol == NULL
4128 && skip_typeref(entity->declaration.type) == type_void) {
4129 goto parameters_finished;
4131 semantic_parameter(&entity->declaration);
4133 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4134 memset(parameter, 0, sizeof(parameter[0]));
4135 parameter->type = entity->declaration.type;
4137 if (scope != NULL) {
4138 append_entity(scope, entity);
4141 if (last_parameter != NULL) {
4142 last_parameter->next = parameter;
4144 type->parameters = parameter;
4146 last_parameter = parameter;
4151 goto parameters_finished;
4153 if (token.type != ',') {
4154 goto parameters_finished;
4160 parameters_finished:
4161 rem_anchor_token(')');
4165 restore_anchor_state(',', saved_comma_state);
4168 typedef enum construct_type_kind_t {
4171 CONSTRUCT_REFERENCE,
4174 } construct_type_kind_t;
4176 typedef struct construct_type_t construct_type_t;
4177 struct construct_type_t {
4178 construct_type_kind_t kind;
4179 construct_type_t *next;
4182 typedef struct parsed_pointer_t parsed_pointer_t;
4183 struct parsed_pointer_t {
4184 construct_type_t construct_type;
4185 type_qualifiers_t type_qualifiers;
4186 variable_t *base_variable; /**< MS __based extension. */
4189 typedef struct parsed_reference_t parsed_reference_t;
4190 struct parsed_reference_t {
4191 construct_type_t construct_type;
4194 typedef struct construct_function_type_t construct_function_type_t;
4195 struct construct_function_type_t {
4196 construct_type_t construct_type;
4197 type_t *function_type;
4200 typedef struct parsed_array_t parsed_array_t;
4201 struct parsed_array_t {
4202 construct_type_t construct_type;
4203 type_qualifiers_t type_qualifiers;
4209 typedef struct construct_base_type_t construct_base_type_t;
4210 struct construct_base_type_t {
4211 construct_type_t construct_type;
4215 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4219 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4220 memset(pointer, 0, sizeof(pointer[0]));
4221 pointer->construct_type.kind = CONSTRUCT_POINTER;
4222 pointer->type_qualifiers = parse_type_qualifiers();
4223 pointer->base_variable = base_variable;
4225 return &pointer->construct_type;
4228 static construct_type_t *parse_reference_declarator(void)
4232 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4233 memset(reference, 0, sizeof(reference[0]));
4234 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4236 return (construct_type_t*)reference;
4239 static construct_type_t *parse_array_declarator(void)
4242 add_anchor_token(']');
4244 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4245 memset(array, 0, sizeof(array[0]));
4246 array->construct_type.kind = CONSTRUCT_ARRAY;
4248 if (token.type == T_static) {
4249 array->is_static = true;
4253 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4254 if (type_qualifiers != 0) {
4255 if (token.type == T_static) {
4256 array->is_static = true;
4260 array->type_qualifiers = type_qualifiers;
4262 if (token.type == '*' && look_ahead(1)->type == ']') {
4263 array->is_variable = true;
4265 } else if (token.type != ']') {
4266 array->size = parse_assignment_expression();
4269 rem_anchor_token(']');
4273 return &array->construct_type;
4276 static construct_type_t *parse_function_declarator(scope_t *scope,
4277 decl_modifiers_t modifiers)
4279 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4280 function_type_t *ftype = &type->function;
4282 ftype->linkage = current_linkage;
4284 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4285 case DM_NONE: break;
4286 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4287 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4288 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4289 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4292 errorf(HERE, "multiple calling conventions in declaration");
4296 parse_parameters(ftype, scope);
4298 construct_function_type_t *construct_function_type =
4299 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4300 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4301 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4302 construct_function_type->function_type = type;
4304 return &construct_function_type->construct_type;
4307 typedef struct parse_declarator_env_t {
4308 decl_modifiers_t modifiers;
4310 source_position_t source_position;
4312 } parse_declarator_env_t;
4314 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4315 bool may_be_abstract)
4317 /* construct a single linked list of construct_type_t's which describe
4318 * how to construct the final declarator type */
4319 construct_type_t *first = NULL;
4320 construct_type_t *last = NULL;
4321 gnu_attribute_t *attributes = NULL;
4323 decl_modifiers_t modifiers = parse_attributes(&attributes);
4325 /* MS __based extension */
4326 based_spec_t base_spec;
4327 base_spec.base_variable = NULL;
4330 construct_type_t *type;
4331 switch (token.type) {
4333 if (!(c_mode & _CXX))
4334 errorf(HERE, "references are only available for C++");
4335 if (base_spec.base_variable != NULL && warning.other) {
4336 warningf(&base_spec.source_position,
4337 "__based does not precede a pointer operator, ignored");
4339 type = parse_reference_declarator();
4341 base_spec.base_variable = NULL;
4345 type = parse_pointer_declarator(base_spec.base_variable);
4347 base_spec.base_variable = NULL;
4353 add_anchor_token(')');
4354 parse_microsoft_based(&base_spec);
4355 rem_anchor_token(')');
4360 goto ptr_operator_end;
4371 /* TODO: find out if this is correct */
4372 modifiers |= parse_attributes(&attributes);
4375 if (base_spec.base_variable != NULL && warning.other) {
4376 warningf(&base_spec.source_position,
4377 "__based does not precede a pointer operator, ignored");
4381 modifiers |= env->modifiers;
4382 env->modifiers = modifiers;
4385 construct_type_t *inner_types = NULL;
4387 switch (token.type) {
4390 errorf(HERE, "no identifier expected in typename");
4392 env->symbol = token.v.symbol;
4393 env->source_position = token.source_position;
4399 add_anchor_token(')');
4400 inner_types = parse_inner_declarator(env, may_be_abstract);
4401 if (inner_types != NULL) {
4402 /* All later declarators only modify the return type */
4405 rem_anchor_token(')');
4409 if (may_be_abstract)
4411 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4416 construct_type_t *p = last;
4419 construct_type_t *type;
4420 switch (token.type) {
4422 scope_t *scope = NULL;
4424 scope = &env->parameters;
4426 type = parse_function_declarator(scope, modifiers);
4430 type = parse_array_declarator();
4433 goto declarator_finished;
4436 /* insert in the middle of the list (behind p) */
4438 type->next = p->next;
4449 declarator_finished:
4450 /* append inner_types at the end of the list, we don't to set last anymore
4451 * as it's not needed anymore */
4453 assert(first == NULL);
4454 first = inner_types;
4456 last->next = inner_types;
4464 static void parse_declaration_attributes(entity_t *entity)
4466 gnu_attribute_t *attributes = NULL;
4467 decl_modifiers_t modifiers = parse_attributes(&attributes);
4473 if (entity->kind == ENTITY_TYPEDEF) {
4474 modifiers |= entity->typedefe.modifiers;
4475 type = entity->typedefe.type;
4477 assert(is_declaration(entity));
4478 modifiers |= entity->declaration.modifiers;
4479 type = entity->declaration.type;
4484 /* handle these strange/stupid mode attributes */
4485 gnu_attribute_t *attribute = attributes;
4486 for ( ; attribute != NULL; attribute = attribute->next) {
4487 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4490 atomic_type_kind_t akind = attribute->u.akind;
4491 if (!is_type_signed(type)) {
4493 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4494 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4495 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4496 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4498 panic("invalid akind in mode attribute");
4502 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break;
4503 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break;
4504 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break;
4505 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break;
4507 panic("invalid akind in mode attribute");
4511 type = make_atomic_type(akind, type->base.qualifiers);
4514 type_modifiers_t type_modifiers = type->base.modifiers;
4515 if (modifiers & DM_TRANSPARENT_UNION)
4516 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4518 if (type->base.modifiers != type_modifiers) {
4519 type_t *copy = duplicate_type(type);
4520 copy->base.modifiers = type_modifiers;
4522 type = typehash_insert(copy);
4524 obstack_free(type_obst, copy);
4528 if (entity->kind == ENTITY_TYPEDEF) {
4529 entity->typedefe.type = type;
4530 entity->typedefe.modifiers = modifiers;
4532 entity->declaration.type = type;
4533 entity->declaration.modifiers = modifiers;
4537 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4539 construct_type_t *iter = construct_list;
4540 for (; iter != NULL; iter = iter->next) {
4541 switch (iter->kind) {
4542 case CONSTRUCT_INVALID:
4543 internal_errorf(HERE, "invalid type construction found");
4544 case CONSTRUCT_FUNCTION: {
4545 construct_function_type_t *construct_function_type
4546 = (construct_function_type_t*) iter;
4548 type_t *function_type = construct_function_type->function_type;
4550 function_type->function.return_type = type;
4552 type_t *skipped_return_type = skip_typeref(type);
4554 if (is_type_function(skipped_return_type)) {
4555 errorf(HERE, "function returning function is not allowed");
4556 } else if (is_type_array(skipped_return_type)) {
4557 errorf(HERE, "function returning array is not allowed");
4559 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4561 "type qualifiers in return type of function type are meaningless");
4565 type = function_type;
4569 case CONSTRUCT_POINTER: {
4570 if (is_type_reference(skip_typeref(type)))
4571 errorf(HERE, "cannot declare a pointer to reference");
4573 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4574 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4578 case CONSTRUCT_REFERENCE:
4579 if (is_type_reference(skip_typeref(type)))
4580 errorf(HERE, "cannot declare a reference to reference");
4582 type = make_reference_type(type);
4585 case CONSTRUCT_ARRAY: {
4586 if (is_type_reference(skip_typeref(type)))
4587 errorf(HERE, "cannot declare an array of references");
4589 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4590 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4592 expression_t *size_expression = parsed_array->size;
4593 if (size_expression != NULL) {
4595 = create_implicit_cast(size_expression, type_size_t);
4598 array_type->base.qualifiers = parsed_array->type_qualifiers;
4599 array_type->array.element_type = type;
4600 array_type->array.is_static = parsed_array->is_static;
4601 array_type->array.is_variable = parsed_array->is_variable;
4602 array_type->array.size_expression = size_expression;
4604 if (size_expression != NULL) {
4605 if (is_constant_expression(size_expression)) {
4606 array_type->array.size_constant = true;
4607 array_type->array.size
4608 = fold_constant(size_expression);
4610 array_type->array.is_vla = true;
4614 type_t *skipped_type = skip_typeref(type);
4616 if (is_type_incomplete(skipped_type)) {
4617 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4618 } else if (is_type_function(skipped_type)) {
4619 errorf(HERE, "array of functions is not allowed");
4626 type_t *hashed_type = typehash_insert(type);
4627 if (hashed_type != type) {
4628 /* the function type was constructed earlier freeing it here will
4629 * destroy other types... */
4630 if (iter->kind != CONSTRUCT_FUNCTION) {
4640 static type_t *automatic_type_conversion(type_t *orig_type);
4642 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4643 declarator_flags_t flags)
4645 parse_declarator_env_t env;
4646 memset(&env, 0, sizeof(env));
4647 env.modifiers = specifiers->modifiers;
4649 construct_type_t *construct_type =
4650 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4652 construct_declarator_type(construct_type, specifiers->type);
4653 type_t *type = skip_typeref(orig_type);
4655 if (construct_type != NULL) {
4656 obstack_free(&temp_obst, construct_type);
4660 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4661 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4662 entity->base.symbol = env.symbol;
4663 entity->base.source_position = env.source_position;
4664 entity->typedefe.type = orig_type;
4666 if (anonymous_entity != NULL) {
4667 if (is_type_compound(type)) {
4668 assert(anonymous_entity->compound.alias == NULL);
4669 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4670 anonymous_entity->kind == ENTITY_UNION);
4671 anonymous_entity->compound.alias = entity;
4672 anonymous_entity = NULL;
4673 } else if (is_type_enum(type)) {
4674 assert(anonymous_entity->enume.alias == NULL);
4675 assert(anonymous_entity->kind == ENTITY_ENUM);
4676 anonymous_entity->enume.alias = entity;
4677 anonymous_entity = NULL;
4681 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4682 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4684 if (specifiers->is_inline && is_type_valid(type)) {
4685 errorf(&env.source_position,
4686 "compound member '%Y' declared 'inline'", env.symbol);
4689 if (specifiers->thread_local ||
4690 specifiers->storage_class != STORAGE_CLASS_NONE) {
4691 errorf(&env.source_position,
4692 "compound member '%Y' must have no storage class",
4695 } else if (flags & DECL_IS_PARAMETER) {
4696 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4697 * shall be adjusted to ``qualified pointer to type'',
4699 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4700 * type'' shall be adjusted to ``pointer to function
4701 * returning type'', as in 6.3.2.1. */
4702 orig_type = automatic_type_conversion(type);
4703 goto create_variable;
4704 } else if (is_type_function(type)) {
4705 entity = allocate_entity_zero(ENTITY_FUNCTION);
4707 entity->function.is_inline = specifiers->is_inline;
4708 entity->function.parameters = env.parameters;
4710 if (specifiers->thread_local || (
4711 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4712 specifiers->storage_class != STORAGE_CLASS_NONE &&
4713 specifiers->storage_class != STORAGE_CLASS_STATIC)
4715 errorf(&env.source_position,
4716 "invalid storage class for function '%Y'", env.symbol);
4720 entity = allocate_entity_zero(ENTITY_VARIABLE);
4722 entity->variable.get_property_sym = specifiers->get_property_sym;
4723 entity->variable.put_property_sym = specifiers->put_property_sym;
4724 if (specifiers->alignment != 0) {
4725 /* TODO: add checks here */
4726 entity->variable.alignment = specifiers->alignment;
4729 if (specifiers->is_inline && is_type_valid(type)) {
4730 errorf(&env.source_position,
4731 "variable '%Y' declared 'inline'", env.symbol);
4734 entity->variable.thread_local = specifiers->thread_local;
4736 bool invalid_storage_class = false;
4737 if (current_scope == file_scope) {
4738 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4739 specifiers->storage_class != STORAGE_CLASS_NONE &&
4740 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4741 invalid_storage_class = true;
4744 if (specifiers->thread_local &&
4745 specifiers->storage_class == STORAGE_CLASS_NONE) {
4746 invalid_storage_class = true;
4749 if (invalid_storage_class) {
4750 errorf(&env.source_position,
4751 "invalid storage class for variable '%Y'", env.symbol);
4755 entity->base.source_position = env.source_position;
4756 entity->base.symbol = env.symbol;
4757 entity->base.namespc = NAMESPACE_NORMAL;
4758 entity->declaration.type = orig_type;
4759 entity->declaration.modifiers = env.modifiers;
4760 entity->declaration.deprecated_string = specifiers->deprecated_string;
4762 storage_class_t storage_class = specifiers->storage_class;
4763 entity->declaration.declared_storage_class = storage_class;
4765 if (storage_class == STORAGE_CLASS_NONE
4766 && current_scope != file_scope) {
4767 storage_class = STORAGE_CLASS_AUTO;
4769 entity->declaration.storage_class = storage_class;
4772 parse_declaration_attributes(entity);
4777 static type_t *parse_abstract_declarator(type_t *base_type)
4779 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4781 type_t *result = construct_declarator_type(construct_type, base_type);
4782 if (construct_type != NULL) {
4783 obstack_free(&temp_obst, construct_type);
4790 * Check if the declaration of main is suspicious. main should be a
4791 * function with external linkage, returning int, taking either zero
4792 * arguments, two, or three arguments of appropriate types, ie.
4794 * int main([ int argc, char **argv [, char **env ] ]).
4796 * @param decl the declaration to check
4797 * @param type the function type of the declaration
4799 static void check_type_of_main(const entity_t *entity)
4801 const source_position_t *pos = &entity->base.source_position;
4802 if (entity->kind != ENTITY_FUNCTION) {
4803 warningf(pos, "'main' is not a function");
4807 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4808 warningf(pos, "'main' is normally a non-static function");
4811 type_t *type = skip_typeref(entity->declaration.type);
4812 assert(is_type_function(type));
4814 function_type_t *func_type = &type->function;
4815 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4816 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4817 func_type->return_type);
4819 const function_parameter_t *parm = func_type->parameters;
4821 type_t *const first_type = parm->type;
4822 if (!types_compatible(skip_typeref(first_type), type_int)) {
4824 "first argument of 'main' should be 'int', but is '%T'",
4829 type_t *const second_type = parm->type;
4830 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4831 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4835 type_t *const third_type = parm->type;
4836 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4837 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4841 goto warn_arg_count;
4845 warningf(pos, "'main' takes only zero, two or three arguments");
4851 * Check if a symbol is the equal to "main".
4853 static bool is_sym_main(const symbol_t *const sym)
4855 return strcmp(sym->string, "main") == 0;
4858 static const char *get_entity_kind_name(entity_kind_t kind)
4860 switch ((entity_kind_tag_t) kind) {
4861 case ENTITY_FUNCTION: return "function";
4862 case ENTITY_VARIABLE: return "variable";
4863 case ENTITY_COMPOUND_MEMBER: return "compound type member";
4864 case ENTITY_STRUCT: return "struct";
4865 case ENTITY_UNION: return "union";
4866 case ENTITY_ENUM: return "enum";
4867 case ENTITY_ENUM_VALUE: return "enum value";
4868 case ENTITY_LABEL: return "label";
4869 case ENTITY_LOCAL_LABEL: return "local label";
4870 case ENTITY_TYPEDEF: return "typedef";
4871 case ENTITY_NAMESPACE: return "namespace";
4872 case ENTITY_INVALID: break;
4875 panic("Invalid entity kind encountered in get_entity_kind_name");
4878 static void error_redefined_as_different_kind(const source_position_t *pos,
4879 const entity_t *old, entity_kind_t new_kind)
4881 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4882 get_entity_kind_name(old->kind), old->base.symbol,
4883 get_entity_kind_name(new_kind), &old->base.source_position);
4887 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4888 * for various problems that occur for multiple definitions
4890 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4892 const symbol_t *const symbol = entity->base.symbol;
4893 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4894 const source_position_t *pos = &entity->base.source_position;
4896 assert(symbol != NULL);
4897 entity_t *previous_entity = get_entity(symbol, namespc);
4898 /* pushing the same entity twice will break the stack structure */
4899 assert(previous_entity != entity);
4901 if (entity->kind == ENTITY_FUNCTION) {
4902 type_t *const orig_type = entity->declaration.type;
4903 type_t *const type = skip_typeref(orig_type);
4905 assert(is_type_function(type));
4906 if (type->function.unspecified_parameters &&
4907 warning.strict_prototypes &&
4908 previous_entity == NULL) {
4909 warningf(pos, "function declaration '%#T' is not a prototype",
4913 if (warning.main && current_scope == file_scope
4914 && is_sym_main(symbol)) {
4915 check_type_of_main(entity);
4919 if (is_declaration(entity)) {
4920 if (warning.nested_externs
4921 && entity->declaration.storage_class == STORAGE_CLASS_EXTERN
4922 && current_scope != file_scope) {
4923 warningf(pos, "nested extern declaration of '%#T'",
4924 entity->declaration.type, symbol);
4928 if (previous_entity != NULL
4929 && previous_entity->base.parent_scope == ¤t_function->parameters
4930 && current_scope->depth == previous_entity->base.parent_scope->depth+1){
4932 assert(previous_entity->kind == ENTITY_VARIABLE);
4934 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4935 entity->declaration.type, symbol,
4936 previous_entity->declaration.type, symbol,
4937 &previous_entity->base.source_position);
4941 if (previous_entity != NULL
4942 && previous_entity->base.parent_scope == current_scope) {
4944 if (previous_entity->kind != entity->kind) {
4945 error_redefined_as_different_kind(pos, previous_entity,
4949 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
4951 "redeclaration of enum entry '%Y' (declared %P)",
4952 symbol, &previous_entity->base.source_position);
4955 if (previous_entity->kind == ENTITY_TYPEDEF) {
4956 /* TODO: C++ allows this for exactly the same type */
4958 "redefinition of typedef '%Y' (declared %P)",
4959 symbol, &previous_entity->base.source_position);
4963 /* at this point we should have only VARIABLES or FUNCTIONS */
4964 assert(is_declaration(previous_entity) && is_declaration(entity));
4966 /* can happen for K&R style declarations */
4967 if (previous_entity->kind == ENTITY_VARIABLE
4968 && previous_entity->declaration.type == NULL
4969 && entity->kind == ENTITY_VARIABLE) {
4970 previous_entity->declaration.type = entity->declaration.type;
4971 previous_entity->declaration.storage_class
4972 = entity->declaration.storage_class;
4973 previous_entity->declaration.declared_storage_class
4974 = entity->declaration.declared_storage_class;
4975 previous_entity->declaration.modifiers
4976 = entity->declaration.modifiers;
4977 previous_entity->declaration.deprecated_string
4978 = entity->declaration.deprecated_string;
4980 assert(entity->declaration.type != NULL);
4982 declaration_t *const previous_declaration
4983 = &previous_entity->declaration;
4984 declaration_t *const declaration = &entity->declaration;
4985 type_t *const orig_type = entity->declaration.type;
4986 type_t *const type = skip_typeref(orig_type);
4988 type_t *prev_type = skip_typeref(previous_declaration->type);
4990 if (!types_compatible(type, prev_type)) {
4992 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4993 orig_type, symbol, previous_declaration->type, symbol,
4994 &previous_entity->base.source_position);
4996 unsigned old_storage_class = previous_declaration->storage_class;
4997 if (warning.redundant_decls && is_definition
4998 && previous_declaration->storage_class == STORAGE_CLASS_STATIC
4999 && !(previous_declaration->modifiers & DM_USED)
5000 && !previous_declaration->used) {
5001 warningf(&previous_entity->base.source_position,
5002 "unnecessary static forward declaration for '%#T'",
5003 previous_declaration->type, symbol);
5006 unsigned new_storage_class = declaration->storage_class;
5007 if (is_type_incomplete(prev_type)) {
5008 previous_declaration->type = type;
5012 /* pretend no storage class means extern for function
5013 * declarations (except if the previous declaration is neither
5014 * none nor extern) */
5015 if (entity->kind == ENTITY_FUNCTION) {
5016 if (prev_type->function.unspecified_parameters) {
5017 previous_declaration->type = type;
5021 switch (old_storage_class) {
5022 case STORAGE_CLASS_NONE:
5023 old_storage_class = STORAGE_CLASS_EXTERN;
5026 case STORAGE_CLASS_EXTERN:
5027 if (is_definition) {
5028 if (warning.missing_prototypes &&
5029 prev_type->function.unspecified_parameters &&
5030 !is_sym_main(symbol)) {
5031 warningf(pos, "no previous prototype for '%#T'",
5034 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5035 new_storage_class = STORAGE_CLASS_EXTERN;
5044 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5045 new_storage_class == STORAGE_CLASS_EXTERN) {
5046 warn_redundant_declaration:
5047 if (!is_definition &&
5048 warning.redundant_decls &&
5049 is_type_valid(prev_type) &&
5050 strcmp(previous_entity->base.source_position.input_name, "<builtin>") != 0) {
5052 "redundant declaration for '%Y' (declared %P)",
5053 symbol, &previous_entity->base.source_position);
5055 } else if (current_function == NULL) {
5056 if (old_storage_class != STORAGE_CLASS_STATIC &&
5057 new_storage_class == STORAGE_CLASS_STATIC) {
5059 "static declaration of '%Y' follows non-static declaration (declared %P)",
5060 symbol, &previous_entity->base.source_position);
5061 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5062 previous_declaration->storage_class = STORAGE_CLASS_NONE;
5063 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
5065 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5067 goto error_redeclaration;
5068 goto warn_redundant_declaration;
5070 } else if (is_type_valid(prev_type)) {
5071 if (old_storage_class == new_storage_class) {
5072 error_redeclaration:
5073 errorf(pos, "redeclaration of '%Y' (declared %P)",
5074 symbol, &previous_entity->base.source_position);
5077 "redeclaration of '%Y' with different linkage (declared %P)",
5078 symbol, &previous_entity->base.source_position);
5083 previous_declaration->modifiers |= declaration->modifiers;
5084 if (entity->kind == ENTITY_FUNCTION) {
5085 previous_entity->function.is_inline |= entity->function.is_inline;
5087 return previous_entity;
5090 if (entity->kind == ENTITY_FUNCTION) {
5091 if (is_definition &&
5092 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5093 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5094 warningf(pos, "no previous prototype for '%#T'",
5095 entity->declaration.type, symbol);
5096 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5097 warningf(pos, "no previous declaration for '%#T'",
5098 entity->declaration.type, symbol);
5101 } else if (warning.missing_declarations
5102 && entity->kind == ENTITY_VARIABLE
5103 && current_scope == file_scope) {
5104 declaration_t *declaration = &entity->declaration;
5105 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5106 warningf(pos, "no previous declaration for '%#T'",
5107 declaration->type, symbol);
5112 assert(entity->base.parent_scope == NULL);
5113 assert(current_scope != NULL);
5115 entity->base.parent_scope = current_scope;
5116 entity->base.namespc = NAMESPACE_NORMAL;
5117 environment_push(entity);
5118 append_entity(current_scope, entity);
5123 static void parser_error_multiple_definition(entity_t *entity,
5124 const source_position_t *source_position)
5126 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
5127 entity->base.symbol, &entity->base.source_position);
5130 static bool is_declaration_specifier(const token_t *token,
5131 bool only_specifiers_qualifiers)
5133 switch (token->type) {
5138 return is_typedef_symbol(token->v.symbol);
5140 case T___extension__:
5142 return !only_specifiers_qualifiers;
5149 static void parse_init_declarator_rest(entity_t *entity)
5151 assert(is_declaration(entity));
5152 declaration_t *const declaration = &entity->declaration;
5156 type_t *orig_type = declaration->type;
5157 type_t *type = skip_typeref(orig_type);
5159 if (entity->kind == ENTITY_VARIABLE
5160 && entity->variable.initializer != NULL) {
5161 parser_error_multiple_definition(entity, HERE);
5164 bool must_be_constant = false;
5165 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5166 entity->base.parent_scope == file_scope) {
5167 must_be_constant = true;
5170 if (is_type_function(type)) {
5171 errorf(&entity->base.source_position,
5172 "function '%#T' is initialized like a variable",
5173 orig_type, entity->base.symbol);
5174 orig_type = type_error_type;
5177 parse_initializer_env_t env;
5178 env.type = orig_type;
5179 env.must_be_constant = must_be_constant;
5180 env.entity = entity;
5181 current_init_decl = entity;
5183 initializer_t *initializer = parse_initializer(&env);
5184 current_init_decl = NULL;
5186 if (entity->kind == ENTITY_VARIABLE) {
5187 /* § 6.7.5 (22) array initializers for arrays with unknown size
5188 * determine the array type size */
5189 declaration->type = env.type;
5190 entity->variable.initializer = initializer;
5194 /* parse rest of a declaration without any declarator */
5195 static void parse_anonymous_declaration_rest(
5196 const declaration_specifiers_t *specifiers)
5199 anonymous_entity = NULL;
5201 if (warning.other) {
5202 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5203 specifiers->thread_local) {
5204 warningf(&specifiers->source_position,
5205 "useless storage class in empty declaration");
5208 type_t *type = specifiers->type;
5209 switch (type->kind) {
5210 case TYPE_COMPOUND_STRUCT:
5211 case TYPE_COMPOUND_UNION: {
5212 if (type->compound.compound->base.symbol == NULL) {
5213 warningf(&specifiers->source_position,
5214 "unnamed struct/union that defines no instances");
5223 warningf(&specifiers->source_position, "empty declaration");
5229 static void check_variable_type_complete(entity_t *ent)
5231 if (ent->kind != ENTITY_VARIABLE)
5234 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5235 * type for the object shall be complete [...] */
5236 declaration_t *decl = &ent->declaration;
5237 if (decl->storage_class != STORAGE_CLASS_NONE)
5240 type_t *type = decl->type;
5241 if (!is_type_incomplete(skip_typeref(type)))
5244 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5245 type, ent->base.symbol);
5249 static void parse_declaration_rest(entity_t *ndeclaration,
5250 const declaration_specifiers_t *specifiers,
5251 parsed_declaration_func finished_declaration)
5253 add_anchor_token(';');
5254 add_anchor_token(',');
5256 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5258 if (token.type == '=') {
5259 parse_init_declarator_rest(entity);
5260 } else if (entity->kind == ENTITY_VARIABLE) {
5261 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5262 * [...] where the extern specifier is explicitly used. */
5263 declaration_t *decl = &entity->declaration;
5264 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5265 type_t *type = decl->type;
5266 if (is_type_reference(skip_typeref(type))) {
5267 errorf(&entity->base.source_position,
5268 "reference '%#T' must be initialized",
5269 type, entity->base.symbol);
5274 check_variable_type_complete(entity);
5276 if (token.type != ',')
5280 add_anchor_token('=');
5281 ndeclaration = parse_declarator(specifiers, DECL_FLAGS_NONE);
5282 rem_anchor_token('=');
5287 anonymous_entity = NULL;
5288 rem_anchor_token(';');
5289 rem_anchor_token(',');
5292 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5294 symbol_t *symbol = entity->base.symbol;
5295 if (symbol == NULL) {
5296 errorf(HERE, "anonymous declaration not valid as function parameter");
5300 assert(entity->base.namespc == NAMESPACE_NORMAL);
5301 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5302 if (previous_entity == NULL
5303 || previous_entity->base.parent_scope != current_scope) {
5304 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5309 if (is_definition) {
5310 errorf(HERE, "parameter %Y is initialised", entity->base.symbol);
5313 return record_entity(entity, false);
5316 static void parse_declaration(parsed_declaration_func finished_declaration)
5318 declaration_specifiers_t specifiers;
5319 memset(&specifiers, 0, sizeof(specifiers));
5321 add_anchor_token(';');
5322 parse_declaration_specifiers(&specifiers);
5323 rem_anchor_token(';');
5325 if (token.type == ';') {
5326 parse_anonymous_declaration_rest(&specifiers);
5328 entity_t *entity = parse_declarator(&specifiers, DECL_FLAGS_NONE);
5329 parse_declaration_rest(entity, &specifiers, finished_declaration);
5333 static type_t *get_default_promoted_type(type_t *orig_type)
5335 type_t *result = orig_type;
5337 type_t *type = skip_typeref(orig_type);
5338 if (is_type_integer(type)) {
5339 result = promote_integer(type);
5340 } else if (type == type_float) {
5341 result = type_double;
5347 static void parse_kr_declaration_list(entity_t *entity)
5349 if (entity->kind != ENTITY_FUNCTION)
5352 type_t *type = skip_typeref(entity->declaration.type);
5353 assert(is_type_function(type));
5354 if (!type->function.kr_style_parameters)
5358 add_anchor_token('{');
5360 /* push function parameters */
5361 size_t const top = environment_top();
5362 scope_t *old_scope = scope_push(&entity->function.parameters);
5364 entity_t *parameter = entity->function.parameters.entities;
5365 for ( ; parameter != NULL; parameter = parameter->base.next) {
5366 assert(parameter->base.parent_scope == NULL);
5367 parameter->base.parent_scope = current_scope;
5368 environment_push(parameter);
5371 /* parse declaration list */
5372 while (is_declaration_specifier(&token, false)) {
5373 parse_declaration(finished_kr_declaration);
5376 /* pop function parameters */
5377 assert(current_scope == &entity->function.parameters);
5378 scope_pop(old_scope);
5379 environment_pop_to(top);
5381 /* update function type */
5382 type_t *new_type = duplicate_type(type);
5384 function_parameter_t *parameters = NULL;
5385 function_parameter_t *last_parameter = NULL;
5387 entity_t *parameter_declaration = entity->function.parameters.entities;
5388 for (; parameter_declaration != NULL;
5389 parameter_declaration = parameter_declaration->base.next) {
5390 type_t *parameter_type = parameter_declaration->declaration.type;
5391 if (parameter_type == NULL) {
5393 errorf(HERE, "no type specified for function parameter '%Y'",
5394 parameter_declaration->base.symbol);
5396 if (warning.implicit_int) {
5397 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5398 parameter_declaration->base.symbol);
5400 parameter_type = type_int;
5401 parameter_declaration->declaration.type = parameter_type;
5405 semantic_parameter(¶meter_declaration->declaration);
5406 parameter_type = parameter_declaration->declaration.type;
5409 * we need the default promoted types for the function type
5411 parameter_type = get_default_promoted_type(parameter_type);
5413 function_parameter_t *function_parameter
5414 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5415 memset(function_parameter, 0, sizeof(function_parameter[0]));
5417 function_parameter->type = parameter_type;
5418 if (last_parameter != NULL) {
5419 last_parameter->next = function_parameter;
5421 parameters = function_parameter;
5423 last_parameter = function_parameter;
5426 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5428 new_type->function.parameters = parameters;
5429 new_type->function.unspecified_parameters = true;
5431 type = typehash_insert(new_type);
5432 if (type != new_type) {
5433 obstack_free(type_obst, new_type);
5436 entity->declaration.type = type;
5438 rem_anchor_token('{');
5441 static bool first_err = true;
5444 * When called with first_err set, prints the name of the current function,
5447 static void print_in_function(void)
5451 diagnosticf("%s: In function '%Y':\n",
5452 current_function->base.base.source_position.input_name,
5453 current_function->base.base.symbol);
5458 * Check if all labels are defined in the current function.
5459 * Check if all labels are used in the current function.
5461 static void check_labels(void)
5463 for (const goto_statement_t *goto_statement = goto_first;
5464 goto_statement != NULL;
5465 goto_statement = goto_statement->next) {
5466 /* skip computed gotos */
5467 if (goto_statement->expression != NULL)
5470 label_t *label = goto_statement->label;
5473 if (label->base.source_position.input_name == NULL) {
5474 print_in_function();
5475 errorf(&goto_statement->base.source_position,
5476 "label '%Y' used but not defined", label->base.symbol);
5480 if (warning.unused_label) {
5481 for (const label_statement_t *label_statement = label_first;
5482 label_statement != NULL;
5483 label_statement = label_statement->next) {
5484 label_t *label = label_statement->label;
5486 if (! label->used) {
5487 print_in_function();
5488 warningf(&label_statement->base.source_position,
5489 "label '%Y' defined but not used", label->base.symbol);
5495 static void warn_unused_decl(entity_t *entity, entity_t *end,
5496 char const *const what)
5498 for (; entity != NULL; entity = entity->base.next) {
5499 if (!is_declaration(entity))
5502 declaration_t *declaration = &entity->declaration;
5503 if (declaration->implicit)
5506 if (!declaration->used) {
5507 print_in_function();
5508 warningf(&entity->base.source_position, "%s '%Y' is unused",
5509 what, entity->base.symbol);
5510 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5511 print_in_function();
5512 warningf(&entity->base.source_position, "%s '%Y' is never read",
5513 what, entity->base.symbol);
5521 static void check_unused_variables(statement_t *const stmt, void *const env)
5525 switch (stmt->kind) {
5526 case STATEMENT_DECLARATION: {
5527 declaration_statement_t const *const decls = &stmt->declaration;
5528 warn_unused_decl(decls->declarations_begin, decls->declarations_end,
5534 warn_unused_decl(stmt->fors.scope.entities, NULL, "variable");
5543 * Check declarations of current_function for unused entities.
5545 static void check_declarations(void)
5547 if (warning.unused_parameter) {
5548 const scope_t *scope = ¤t_function->parameters;
5550 /* do not issue unused warnings for main */
5551 if (!is_sym_main(current_function->base.base.symbol)) {
5552 warn_unused_decl(scope->entities, NULL, "parameter");
5555 if (warning.unused_variable) {
5556 walk_statements(current_function->statement, check_unused_variables,
5561 static int determine_truth(expression_t const* const cond)
5564 !is_constant_expression(cond) ? 0 :
5565 fold_constant(cond) != 0 ? 1 :
5569 static void check_reachable(statement_t *);
5571 static bool expression_returns(expression_t const *const expr)
5573 switch (expr->kind) {
5575 expression_t const *const func = expr->call.function;
5576 if (func->kind == EXPR_REFERENCE) {
5577 entity_t *entity = func->reference.entity;
5578 if (entity->kind == ENTITY_FUNCTION
5579 && entity->declaration.modifiers & DM_NORETURN)
5583 if (!expression_returns(func))
5586 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5587 if (!expression_returns(arg->expression))
5594 case EXPR_REFERENCE:
5595 case EXPR_REFERENCE_ENUM_VALUE:
5597 case EXPR_CHARACTER_CONSTANT:
5598 case EXPR_WIDE_CHARACTER_CONSTANT:
5599 case EXPR_STRING_LITERAL:
5600 case EXPR_WIDE_STRING_LITERAL:
5601 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5602 case EXPR_LABEL_ADDRESS:
5603 case EXPR_CLASSIFY_TYPE:
5604 case EXPR_SIZEOF: // TODO handle obscure VLA case
5607 case EXPR_BUILTIN_SYMBOL:
5608 case EXPR_BUILTIN_CONSTANT_P:
5609 case EXPR_BUILTIN_PREFETCH:
5614 case EXPR_STATEMENT:
5615 check_reachable(expr->statement.statement);
5616 // TODO check if statement can be left
5619 case EXPR_CONDITIONAL:
5620 // TODO handle constant expression
5622 expression_returns(expr->conditional.condition) && (
5623 expression_returns(expr->conditional.true_expression) ||
5624 expression_returns(expr->conditional.false_expression)
5628 return expression_returns(expr->select.compound);
5630 case EXPR_ARRAY_ACCESS:
5632 expression_returns(expr->array_access.array_ref) &&
5633 expression_returns(expr->array_access.index);
5636 return expression_returns(expr->va_starte.ap);
5639 return expression_returns(expr->va_arge.ap);
5641 EXPR_UNARY_CASES_MANDATORY
5642 return expression_returns(expr->unary.value);
5644 case EXPR_UNARY_THROW:
5648 // TODO handle constant lhs of && and ||
5650 expression_returns(expr->binary.left) &&
5651 expression_returns(expr->binary.right);
5657 panic("unhandled expression");
5660 static bool initializer_returns(initializer_t const *const init)
5662 switch (init->kind) {
5663 case INITIALIZER_VALUE:
5664 return expression_returns(init->value.value);
5666 case INITIALIZER_LIST: {
5667 initializer_t * const* i = init->list.initializers;
5668 initializer_t * const* const end = i + init->list.len;
5669 bool returns = true;
5670 for (; i != end; ++i) {
5671 if (!initializer_returns(*i))
5677 case INITIALIZER_STRING:
5678 case INITIALIZER_WIDE_STRING:
5679 case INITIALIZER_DESIGNATOR: // designators have no payload
5682 panic("unhandled initializer");
5685 static bool noreturn_candidate;
5687 static void check_reachable(statement_t *const stmt)
5689 if (stmt->base.reachable)
5691 if (stmt->kind != STATEMENT_DO_WHILE)
5692 stmt->base.reachable = true;
5694 statement_t *last = stmt;
5696 switch (stmt->kind) {
5697 case STATEMENT_INVALID:
5698 case STATEMENT_EMPTY:
5699 case STATEMENT_LOCAL_LABEL:
5701 next = stmt->base.next;
5704 case STATEMENT_DECLARATION: {
5705 declaration_statement_t const *const decl = &stmt->declaration;
5706 entity_t const * ent = decl->declarations_begin;
5707 entity_t const *const last = decl->declarations_end;
5708 for (;; ent = ent->base.next) {
5709 if (ent->kind == ENTITY_VARIABLE &&
5710 ent->variable.initializer != NULL &&
5711 !initializer_returns(ent->variable.initializer)) {
5717 next = stmt->base.next;
5721 case STATEMENT_COMPOUND:
5722 next = stmt->compound.statements;
5725 case STATEMENT_RETURN: {
5726 expression_t const *const val = stmt->returns.value;
5727 if (val == NULL || expression_returns(val))
5728 noreturn_candidate = false;
5732 case STATEMENT_IF: {
5733 if_statement_t const *const ifs = &stmt->ifs;
5734 expression_t const *const cond = ifs->condition;
5736 if (!expression_returns(cond))
5739 int const val = determine_truth(cond);
5742 check_reachable(ifs->true_statement);
5747 if (ifs->false_statement != NULL) {
5748 check_reachable(ifs->false_statement);
5752 next = stmt->base.next;
5756 case STATEMENT_SWITCH: {
5757 switch_statement_t const *const switchs = &stmt->switchs;
5758 expression_t const *const expr = switchs->expression;
5760 if (!expression_returns(expr))
5763 if (is_constant_expression(expr)) {
5764 long const val = fold_constant(expr);
5765 case_label_statement_t * defaults = NULL;
5766 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5767 if (i->expression == NULL) {
5772 if (i->first_case <= val && val <= i->last_case) {
5773 check_reachable((statement_t*)i);
5778 if (defaults != NULL) {
5779 check_reachable((statement_t*)defaults);
5783 bool has_default = false;
5784 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5785 if (i->expression == NULL)
5788 check_reachable((statement_t*)i);
5795 next = stmt->base.next;
5799 case STATEMENT_EXPRESSION: {
5800 /* Check for noreturn function call */
5801 expression_t const *const expr = stmt->expression.expression;
5802 if (!expression_returns(expr))
5805 next = stmt->base.next;
5809 case STATEMENT_CONTINUE: {
5810 statement_t *parent = stmt;
5812 parent = parent->base.parent;
5813 if (parent == NULL) /* continue not within loop */
5817 switch (parent->kind) {
5818 case STATEMENT_WHILE: goto continue_while;
5819 case STATEMENT_DO_WHILE: goto continue_do_while;
5820 case STATEMENT_FOR: goto continue_for;
5827 case STATEMENT_BREAK: {
5828 statement_t *parent = stmt;
5830 parent = parent->base.parent;
5831 if (parent == NULL) /* break not within loop/switch */
5834 switch (parent->kind) {
5835 case STATEMENT_SWITCH:
5836 case STATEMENT_WHILE:
5837 case STATEMENT_DO_WHILE:
5840 next = parent->base.next;
5841 goto found_break_parent;
5850 case STATEMENT_GOTO:
5851 if (stmt->gotos.expression) {
5852 if (!expression_returns(stmt->gotos.expression))
5855 statement_t *parent = stmt->base.parent;
5856 if (parent == NULL) /* top level goto */
5860 next = stmt->gotos.label->statement;
5861 if (next == NULL) /* missing label */
5866 case STATEMENT_LABEL:
5867 next = stmt->label.statement;
5870 case STATEMENT_CASE_LABEL:
5871 next = stmt->case_label.statement;
5874 case STATEMENT_WHILE: {
5875 while_statement_t const *const whiles = &stmt->whiles;
5876 expression_t const *const cond = whiles->condition;
5878 if (!expression_returns(cond))
5881 int const val = determine_truth(cond);
5884 check_reachable(whiles->body);
5889 next = stmt->base.next;
5893 case STATEMENT_DO_WHILE:
5894 next = stmt->do_while.body;
5897 case STATEMENT_FOR: {
5898 for_statement_t *const fors = &stmt->fors;
5900 if (fors->condition_reachable)
5902 fors->condition_reachable = true;
5904 expression_t const *const cond = fors->condition;
5909 } else if (expression_returns(cond)) {
5910 val = determine_truth(cond);
5916 check_reachable(fors->body);
5921 next = stmt->base.next;
5925 case STATEMENT_MS_TRY: {
5926 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5927 check_reachable(ms_try->try_statement);
5928 next = ms_try->final_statement;
5932 case STATEMENT_LEAVE: {
5933 statement_t *parent = stmt;
5935 parent = parent->base.parent;
5936 if (parent == NULL) /* __leave not within __try */
5939 if (parent->kind == STATEMENT_MS_TRY) {
5941 next = parent->ms_try.final_statement;
5949 while (next == NULL) {
5950 next = last->base.parent;
5952 noreturn_candidate = false;
5954 type_t *const type = current_function->base.type;
5955 assert(is_type_function(type));
5956 type_t *const ret = skip_typeref(type->function.return_type);
5957 if (warning.return_type &&
5958 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5959 is_type_valid(ret) &&
5960 !is_sym_main(current_function->base.base.symbol)) {
5961 warningf(&stmt->base.source_position,
5962 "control reaches end of non-void function");
5967 switch (next->kind) {
5968 case STATEMENT_INVALID:
5969 case STATEMENT_EMPTY:
5970 case STATEMENT_DECLARATION:
5971 case STATEMENT_LOCAL_LABEL:
5972 case STATEMENT_EXPRESSION:
5974 case STATEMENT_RETURN:
5975 case STATEMENT_CONTINUE:
5976 case STATEMENT_BREAK:
5977 case STATEMENT_GOTO:
5978 case STATEMENT_LEAVE:
5979 panic("invalid control flow in function");
5981 case STATEMENT_COMPOUND:
5983 case STATEMENT_SWITCH:
5984 case STATEMENT_LABEL:
5985 case STATEMENT_CASE_LABEL:
5987 next = next->base.next;
5990 case STATEMENT_WHILE: {
5992 if (next->base.reachable)
5994 next->base.reachable = true;
5996 while_statement_t const *const whiles = &next->whiles;
5997 expression_t const *const cond = whiles->condition;
5999 if (!expression_returns(cond))
6002 int const val = determine_truth(cond);
6005 check_reachable(whiles->body);
6011 next = next->base.next;
6015 case STATEMENT_DO_WHILE: {
6017 if (next->base.reachable)
6019 next->base.reachable = true;
6021 do_while_statement_t const *const dw = &next->do_while;
6022 expression_t const *const cond = dw->condition;
6024 if (!expression_returns(cond))
6027 int const val = determine_truth(cond);
6030 check_reachable(dw->body);
6036 next = next->base.next;
6040 case STATEMENT_FOR: {
6042 for_statement_t *const fors = &next->fors;
6044 fors->step_reachable = true;
6046 if (fors->condition_reachable)
6048 fors->condition_reachable = true;
6050 expression_t const *const cond = fors->condition;
6055 } else if (expression_returns(cond)) {
6056 val = determine_truth(cond);
6062 check_reachable(fors->body);
6068 next = next->base.next;
6072 case STATEMENT_MS_TRY:
6074 next = next->ms_try.final_statement;
6079 check_reachable(next);
6082 static void check_unreachable(statement_t* const stmt, void *const env)
6086 switch (stmt->kind) {
6087 case STATEMENT_DO_WHILE:
6088 if (!stmt->base.reachable) {
6089 expression_t const *const cond = stmt->do_while.condition;
6090 if (determine_truth(cond) >= 0) {
6091 warningf(&cond->base.source_position,
6092 "condition of do-while-loop is unreachable");
6097 case STATEMENT_FOR: {
6098 for_statement_t const* const fors = &stmt->fors;
6100 // if init and step are unreachable, cond is unreachable, too
6101 if (!stmt->base.reachable && !fors->step_reachable) {
6102 warningf(&stmt->base.source_position, "statement is unreachable");
6104 if (!stmt->base.reachable && fors->initialisation != NULL) {
6105 warningf(&fors->initialisation->base.source_position,
6106 "initialisation of for-statement is unreachable");
6109 if (!fors->condition_reachable && fors->condition != NULL) {
6110 warningf(&fors->condition->base.source_position,
6111 "condition of for-statement is unreachable");
6114 if (!fors->step_reachable && fors->step != NULL) {
6115 warningf(&fors->step->base.source_position,
6116 "step of for-statement is unreachable");
6122 case STATEMENT_COMPOUND:
6123 if (stmt->compound.statements != NULL)
6125 goto warn_unreachable;
6127 case STATEMENT_DECLARATION: {
6128 /* Only warn if there is at least one declarator with an initializer.
6129 * This typically occurs in switch statements. */
6130 declaration_statement_t const *const decl = &stmt->declaration;
6131 entity_t const * ent = decl->declarations_begin;
6132 entity_t const *const last = decl->declarations_end;
6133 for (;; ent = ent->base.next) {
6134 if (ent->kind == ENTITY_VARIABLE &&
6135 ent->variable.initializer != NULL) {
6136 goto warn_unreachable;
6145 if (!stmt->base.reachable)
6146 warningf(&stmt->base.source_position, "statement is unreachable");
6151 static void parse_external_declaration(void)
6153 /* function-definitions and declarations both start with declaration
6155 declaration_specifiers_t specifiers;
6156 memset(&specifiers, 0, sizeof(specifiers));
6158 add_anchor_token(';');
6159 parse_declaration_specifiers(&specifiers);
6160 rem_anchor_token(';');
6162 /* must be a declaration */
6163 if (token.type == ';') {
6164 parse_anonymous_declaration_rest(&specifiers);
6168 add_anchor_token(',');
6169 add_anchor_token('=');
6170 add_anchor_token(';');
6171 add_anchor_token('{');
6173 /* declarator is common to both function-definitions and declarations */
6174 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6176 rem_anchor_token('{');
6177 rem_anchor_token(';');
6178 rem_anchor_token('=');
6179 rem_anchor_token(',');
6181 /* must be a declaration */
6182 switch (token.type) {
6186 parse_declaration_rest(ndeclaration, &specifiers, record_entity);
6190 /* must be a function definition */
6191 parse_kr_declaration_list(ndeclaration);
6193 if (token.type != '{') {
6194 parse_error_expected("while parsing function definition", '{', NULL);
6195 eat_until_matching_token(';');
6199 assert(is_declaration(ndeclaration));
6200 type_t *type = skip_typeref(ndeclaration->declaration.type);
6202 if (!is_type_function(type)) {
6203 if (is_type_valid(type)) {
6204 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6205 type, ndeclaration->base.symbol);
6211 if (warning.aggregate_return &&
6212 is_type_compound(skip_typeref(type->function.return_type))) {
6213 warningf(HERE, "function '%Y' returns an aggregate",
6214 ndeclaration->base.symbol);
6216 if (warning.traditional && !type->function.unspecified_parameters) {
6217 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6218 ndeclaration->base.symbol);
6220 if (warning.old_style_definition && type->function.unspecified_parameters) {
6221 warningf(HERE, "old-style function definition '%Y'",
6222 ndeclaration->base.symbol);
6225 /* § 6.7.5.3 (14) a function definition with () means no
6226 * parameters (and not unspecified parameters) */
6227 if (type->function.unspecified_parameters
6228 && type->function.parameters == NULL
6229 && !type->function.kr_style_parameters) {
6230 type_t *duplicate = duplicate_type(type);
6231 duplicate->function.unspecified_parameters = false;
6233 type = typehash_insert(duplicate);
6234 if (type != duplicate) {
6235 obstack_free(type_obst, duplicate);
6237 ndeclaration->declaration.type = type;
6240 entity_t *const entity = record_entity(ndeclaration, true);
6241 assert(entity->kind == ENTITY_FUNCTION);
6242 assert(ndeclaration->kind == ENTITY_FUNCTION);
6244 function_t *function = &entity->function;
6245 if (ndeclaration != entity) {
6246 function->parameters = ndeclaration->function.parameters;
6248 assert(is_declaration(entity));
6249 type = skip_typeref(entity->declaration.type);
6251 /* push function parameters and switch scope */
6252 size_t const top = environment_top();
6253 scope_t *old_scope = scope_push(&function->parameters);
6255 entity_t *parameter = function->parameters.entities;
6256 for (; parameter != NULL; parameter = parameter->base.next) {
6257 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6258 parameter->base.parent_scope = current_scope;
6260 assert(parameter->base.parent_scope == NULL
6261 || parameter->base.parent_scope == current_scope);
6262 parameter->base.parent_scope = current_scope;
6263 if (parameter->base.symbol == NULL) {
6264 errorf(¶meter->base.source_position, "parameter name omitted");
6267 environment_push(parameter);
6270 if (function->statement != NULL) {
6271 parser_error_multiple_definition(entity, HERE);
6274 /* parse function body */
6275 int label_stack_top = label_top();
6276 function_t *old_current_function = current_function;
6277 current_function = function;
6278 current_parent = NULL;
6281 goto_anchor = &goto_first;
6283 label_anchor = &label_first;
6285 statement_t *const body = parse_compound_statement(false);
6286 function->statement = body;
6289 check_declarations();
6290 if (warning.return_type ||
6291 warning.unreachable_code ||
6292 (warning.missing_noreturn
6293 && !(function->base.modifiers & DM_NORETURN))) {
6294 noreturn_candidate = true;
6295 check_reachable(body);
6296 if (warning.unreachable_code)
6297 walk_statements(body, check_unreachable, NULL);
6298 if (warning.missing_noreturn &&
6299 noreturn_candidate &&
6300 !(function->base.modifiers & DM_NORETURN)) {
6301 warningf(&body->base.source_position,
6302 "function '%#T' is candidate for attribute 'noreturn'",
6303 type, entity->base.symbol);
6307 assert(current_parent == NULL);
6308 assert(current_function == function);
6309 current_function = old_current_function;
6310 label_pop_to(label_stack_top);
6313 assert(current_scope == &function->parameters);
6314 scope_pop(old_scope);
6315 environment_pop_to(top);
6318 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6319 source_position_t *source_position,
6320 const symbol_t *symbol)
6322 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6324 type->bitfield.base_type = base_type;
6325 type->bitfield.size_expression = size;
6328 type_t *skipped_type = skip_typeref(base_type);
6329 if (!is_type_integer(skipped_type)) {
6330 errorf(HERE, "bitfield base type '%T' is not an integer type",
6334 bit_size = skipped_type->base.size * 8;
6337 if (is_constant_expression(size)) {
6338 long v = fold_constant(size);
6341 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6342 } else if (v == 0) {
6343 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6344 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6345 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6347 type->bitfield.bit_size = v;
6354 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6356 entity_t *iter = compound->members.entities;
6357 for (; iter != NULL; iter = iter->base.next) {
6358 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6361 if (iter->base.symbol == symbol) {
6363 } else if (iter->base.symbol == NULL) {
6364 type_t *type = skip_typeref(iter->declaration.type);
6365 if (is_type_compound(type)) {
6367 = find_compound_entry(type->compound.compound, symbol);
6378 static void parse_compound_declarators(compound_t *compound,
6379 const declaration_specifiers_t *specifiers)
6384 if (token.type == ':') {
6385 source_position_t source_position = *HERE;
6388 type_t *base_type = specifiers->type;
6389 expression_t *size = parse_constant_expression();
6391 type_t *type = make_bitfield_type(base_type, size,
6392 &source_position, sym_anonymous);
6394 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6395 entity->base.namespc = NAMESPACE_NORMAL;
6396 entity->base.source_position = source_position;
6397 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6398 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6399 entity->declaration.modifiers = specifiers->modifiers;
6400 entity->declaration.type = type;
6402 entity = parse_declarator(specifiers,
6403 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6404 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6406 if (token.type == ':') {
6407 source_position_t source_position = *HERE;
6409 expression_t *size = parse_constant_expression();
6411 type_t *type = entity->declaration.type;
6412 type_t *bitfield_type = make_bitfield_type(type, size,
6413 &source_position, entity->base.symbol);
6414 entity->declaration.type = bitfield_type;
6418 /* make sure we don't define a symbol multiple times */
6419 symbol_t *symbol = entity->base.symbol;
6420 if (symbol != NULL) {
6421 entity_t *prev = find_compound_entry(compound, symbol);
6424 errorf(&entity->base.source_position,
6425 "multiple declarations of symbol '%Y' (declared %P)",
6426 symbol, &prev->base.source_position);
6430 append_entity(&compound->members, entity);
6432 type_t *orig_type = entity->declaration.type;
6433 type_t *type = skip_typeref(orig_type);
6434 if (is_type_function(type)) {
6435 errorf(&entity->base.source_position,
6436 "compound member '%Y' must not have function type '%T'",
6437 entity->base.symbol, orig_type);
6438 } else if (is_type_incomplete(type)) {
6439 /* §6.7.2.1:16 flexible array member */
6440 if (is_type_array(type) &&
6441 token.type == ';' &&
6442 look_ahead(1)->type == '}') {
6443 compound->has_flexible_member = true;
6445 errorf(&entity->base.source_position,
6446 "compound member '%Y' has incomplete type '%T'",
6447 entity->base.symbol, orig_type);
6451 if (token.type != ',')
6458 anonymous_entity = NULL;
6461 static void parse_compound_type_entries(compound_t *compound)
6464 add_anchor_token('}');
6466 while (token.type != '}') {
6467 if (token.type == T_EOF) {
6468 errorf(HERE, "EOF while parsing struct");
6471 declaration_specifiers_t specifiers;
6472 memset(&specifiers, 0, sizeof(specifiers));
6473 parse_declaration_specifiers(&specifiers);
6475 parse_compound_declarators(compound, &specifiers);
6477 rem_anchor_token('}');
6481 compound->complete = true;
6484 static type_t *parse_typename(void)
6486 declaration_specifiers_t specifiers;
6487 memset(&specifiers, 0, sizeof(specifiers));
6488 parse_declaration_specifiers(&specifiers);
6489 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6490 specifiers.thread_local) {
6491 /* TODO: improve error message, user does probably not know what a
6492 * storage class is...
6494 errorf(HERE, "typename may not have a storage class");
6497 type_t *result = parse_abstract_declarator(specifiers.type);
6505 typedef expression_t* (*parse_expression_function)(void);
6506 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6508 typedef struct expression_parser_function_t expression_parser_function_t;
6509 struct expression_parser_function_t {
6510 parse_expression_function parser;
6511 unsigned infix_precedence;
6512 parse_expression_infix_function infix_parser;
6515 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6518 * Prints an error message if an expression was expected but not read
6520 static expression_t *expected_expression_error(void)
6522 /* skip the error message if the error token was read */
6523 if (token.type != T_ERROR) {
6524 errorf(HERE, "expected expression, got token '%K'", &token);
6528 return create_invalid_expression();
6532 * Parse a string constant.
6534 static expression_t *parse_string_const(void)
6537 if (token.type == T_STRING_LITERAL) {
6538 string_t res = token.v.string;
6540 while (token.type == T_STRING_LITERAL) {
6541 res = concat_strings(&res, &token.v.string);
6544 if (token.type != T_WIDE_STRING_LITERAL) {
6545 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6546 /* note: that we use type_char_ptr here, which is already the
6547 * automatic converted type. revert_automatic_type_conversion
6548 * will construct the array type */
6549 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6550 cnst->string.value = res;
6554 wres = concat_string_wide_string(&res, &token.v.wide_string);
6556 wres = token.v.wide_string;
6561 switch (token.type) {
6562 case T_WIDE_STRING_LITERAL:
6563 wres = concat_wide_strings(&wres, &token.v.wide_string);
6566 case T_STRING_LITERAL:
6567 wres = concat_wide_string_string(&wres, &token.v.string);
6571 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6572 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6573 cnst->wide_string.value = wres;
6582 * Parse a boolean constant.
6584 static expression_t *parse_bool_const(bool value)
6586 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6587 cnst->base.type = type_bool;
6588 cnst->conste.v.int_value = value;
6596 * Parse an integer constant.
6598 static expression_t *parse_int_const(void)
6600 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6601 cnst->base.type = token.datatype;
6602 cnst->conste.v.int_value = token.v.intvalue;
6610 * Parse a character constant.
6612 static expression_t *parse_character_constant(void)
6614 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6615 cnst->base.type = token.datatype;
6616 cnst->conste.v.character = token.v.string;
6618 if (cnst->conste.v.character.size != 1) {
6620 errorf(HERE, "more than 1 character in character constant");
6621 } else if (warning.multichar) {
6622 warningf(HERE, "multi-character character constant");
6631 * Parse a wide character constant.
6633 static expression_t *parse_wide_character_constant(void)
6635 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6636 cnst->base.type = token.datatype;
6637 cnst->conste.v.wide_character = token.v.wide_string;
6639 if (cnst->conste.v.wide_character.size != 1) {
6641 errorf(HERE, "more than 1 character in character constant");
6642 } else if (warning.multichar) {
6643 warningf(HERE, "multi-character character constant");
6652 * Parse a float constant.
6654 static expression_t *parse_float_const(void)
6656 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6657 cnst->base.type = token.datatype;
6658 cnst->conste.v.float_value = token.v.floatvalue;
6665 static entity_t *create_implicit_function(symbol_t *symbol,
6666 const source_position_t *source_position)
6668 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6669 ntype->function.return_type = type_int;
6670 ntype->function.unspecified_parameters = true;
6672 type_t *type = typehash_insert(ntype);
6673 if (type != ntype) {
6677 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6678 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6679 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6680 entity->declaration.type = type;
6681 entity->declaration.implicit = true;
6682 entity->base.symbol = symbol;
6683 entity->base.source_position = *source_position;
6685 bool strict_prototypes_old = warning.strict_prototypes;
6686 warning.strict_prototypes = false;
6687 record_entity(entity, false);
6688 warning.strict_prototypes = strict_prototypes_old;
6694 * Creates a return_type (func)(argument_type) function type if not
6697 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6698 type_t *argument_type2)
6700 function_parameter_t *parameter2
6701 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6702 memset(parameter2, 0, sizeof(parameter2[0]));
6703 parameter2->type = argument_type2;
6705 function_parameter_t *parameter1
6706 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6707 memset(parameter1, 0, sizeof(parameter1[0]));
6708 parameter1->type = argument_type1;
6709 parameter1->next = parameter2;
6711 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6712 type->function.return_type = return_type;
6713 type->function.parameters = parameter1;
6715 type_t *result = typehash_insert(type);
6716 if (result != type) {
6724 * Creates a return_type (func)(argument_type) function type if not
6727 * @param return_type the return type
6728 * @param argument_type the argument type
6730 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6732 function_parameter_t *parameter
6733 = obstack_alloc(type_obst, sizeof(parameter[0]));
6734 memset(parameter, 0, sizeof(parameter[0]));
6735 parameter->type = argument_type;
6737 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6738 type->function.return_type = return_type;
6739 type->function.parameters = parameter;
6741 type_t *result = typehash_insert(type);
6742 if (result != type) {
6749 static type_t *make_function_0_type(type_t *return_type)
6751 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6752 type->function.return_type = return_type;
6753 type->function.parameters = NULL;
6755 type_t *result = typehash_insert(type);
6756 if (result != type) {
6764 * Creates a function type for some function like builtins.
6766 * @param symbol the symbol describing the builtin
6768 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6770 switch (symbol->ID) {
6771 case T___builtin_alloca:
6772 return make_function_1_type(type_void_ptr, type_size_t);
6773 case T___builtin_huge_val:
6774 return make_function_0_type(type_double);
6775 case T___builtin_inf:
6776 return make_function_0_type(type_double);
6777 case T___builtin_inff:
6778 return make_function_0_type(type_float);
6779 case T___builtin_infl:
6780 return make_function_0_type(type_long_double);
6781 case T___builtin_nan:
6782 return make_function_1_type(type_double, type_char_ptr);
6783 case T___builtin_nanf:
6784 return make_function_1_type(type_float, type_char_ptr);
6785 case T___builtin_nanl:
6786 return make_function_1_type(type_long_double, type_char_ptr);
6787 case T___builtin_va_end:
6788 return make_function_1_type(type_void, type_valist);
6789 case T___builtin_expect:
6790 return make_function_2_type(type_long, type_long, type_long);
6792 internal_errorf(HERE, "not implemented builtin symbol found");
6797 * Performs automatic type cast as described in § 6.3.2.1.
6799 * @param orig_type the original type
6801 static type_t *automatic_type_conversion(type_t *orig_type)
6803 type_t *type = skip_typeref(orig_type);
6804 if (is_type_array(type)) {
6805 array_type_t *array_type = &type->array;
6806 type_t *element_type = array_type->element_type;
6807 unsigned qualifiers = array_type->base.qualifiers;
6809 return make_pointer_type(element_type, qualifiers);
6812 if (is_type_function(type)) {
6813 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6820 * reverts the automatic casts of array to pointer types and function
6821 * to function-pointer types as defined § 6.3.2.1
6823 type_t *revert_automatic_type_conversion(const expression_t *expression)
6825 switch (expression->kind) {
6826 case EXPR_REFERENCE: {
6827 entity_t *entity = expression->reference.entity;
6828 if (is_declaration(entity)) {
6829 return entity->declaration.type;
6830 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6831 return entity->enum_value.enum_type;
6833 panic("no declaration or enum in reference");
6838 entity_t *entity = expression->select.compound_entry;
6839 assert(is_declaration(entity));
6840 type_t *type = entity->declaration.type;
6841 return get_qualified_type(type,
6842 expression->base.type->base.qualifiers);
6845 case EXPR_UNARY_DEREFERENCE: {
6846 const expression_t *const value = expression->unary.value;
6847 type_t *const type = skip_typeref(value->base.type);
6848 assert(is_type_pointer(type));
6849 return type->pointer.points_to;
6852 case EXPR_BUILTIN_SYMBOL:
6853 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6855 case EXPR_ARRAY_ACCESS: {
6856 const expression_t *array_ref = expression->array_access.array_ref;
6857 type_t *type_left = skip_typeref(array_ref->base.type);
6858 if (!is_type_valid(type_left))
6860 assert(is_type_pointer(type_left));
6861 return type_left->pointer.points_to;
6864 case EXPR_STRING_LITERAL: {
6865 size_t size = expression->string.value.size;
6866 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6869 case EXPR_WIDE_STRING_LITERAL: {
6870 size_t size = expression->wide_string.value.size;
6871 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6874 case EXPR_COMPOUND_LITERAL:
6875 return expression->compound_literal.type;
6880 return expression->base.type;
6883 static expression_t *parse_reference(void)
6885 symbol_t *const symbol = token.v.symbol;
6887 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6889 if (entity == NULL) {
6890 if (!strict_mode && look_ahead(1)->type == '(') {
6891 /* an implicitly declared function */
6892 if (warning.implicit_function_declaration) {
6893 warningf(HERE, "implicit declaration of function '%Y'",
6897 entity = create_implicit_function(symbol, HERE);
6899 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6900 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6906 if (is_declaration(entity)) {
6907 orig_type = entity->declaration.type;
6908 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6909 orig_type = entity->enum_value.enum_type;
6910 } else if (entity->kind == ENTITY_TYPEDEF) {
6911 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
6914 return create_invalid_expression();
6916 panic("expected declaration or enum value in reference");
6919 /* we always do the auto-type conversions; the & and sizeof parser contains
6920 * code to revert this! */
6921 type_t *type = automatic_type_conversion(orig_type);
6923 expression_kind_t kind = EXPR_REFERENCE;
6924 if (entity->kind == ENTITY_ENUM_VALUE)
6925 kind = EXPR_REFERENCE_ENUM_VALUE;
6927 expression_t *expression = allocate_expression_zero(kind);
6928 expression->reference.entity = entity;
6929 expression->base.type = type;
6931 /* this declaration is used */
6932 if (is_declaration(entity)) {
6933 entity->declaration.used = true;
6936 if (entity->base.parent_scope != file_scope
6937 && entity->base.parent_scope->depth < current_function->parameters.depth
6938 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
6939 if (entity->kind == ENTITY_VARIABLE) {
6940 /* access of a variable from an outer function */
6941 entity->variable.address_taken = true;
6943 current_function->need_closure = true;
6946 /* check for deprecated functions */
6947 if (warning.deprecated_declarations
6948 && is_declaration(entity)
6949 && entity->declaration.modifiers & DM_DEPRECATED) {
6950 declaration_t *declaration = &entity->declaration;
6952 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
6953 "function" : "variable";
6955 if (declaration->deprecated_string != NULL) {
6956 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6957 prefix, entity->base.symbol, &entity->base.source_position,
6958 declaration->deprecated_string);
6960 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6961 entity->base.symbol, &entity->base.source_position);
6965 if (warning.init_self && entity == current_init_decl && !in_type_prop
6966 && entity->kind == ENTITY_VARIABLE) {
6967 current_init_decl = NULL;
6968 warningf(HERE, "variable '%#T' is initialized by itself",
6969 entity->declaration.type, entity->base.symbol);
6976 static bool semantic_cast(expression_t *cast)
6978 expression_t *expression = cast->unary.value;
6979 type_t *orig_dest_type = cast->base.type;
6980 type_t *orig_type_right = expression->base.type;
6981 type_t const *dst_type = skip_typeref(orig_dest_type);
6982 type_t const *src_type = skip_typeref(orig_type_right);
6983 source_position_t const *pos = &cast->base.source_position;
6985 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6986 if (dst_type == type_void)
6989 /* only integer and pointer can be casted to pointer */
6990 if (is_type_pointer(dst_type) &&
6991 !is_type_pointer(src_type) &&
6992 !is_type_integer(src_type) &&
6993 is_type_valid(src_type)) {
6994 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6998 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6999 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7003 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7004 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7008 if (warning.cast_qual &&
7009 is_type_pointer(src_type) &&
7010 is_type_pointer(dst_type)) {
7011 type_t *src = skip_typeref(src_type->pointer.points_to);
7012 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7013 unsigned missing_qualifiers =
7014 src->base.qualifiers & ~dst->base.qualifiers;
7015 if (missing_qualifiers != 0) {
7017 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7018 missing_qualifiers, orig_type_right);
7024 static expression_t *parse_compound_literal(type_t *type)
7026 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7028 parse_initializer_env_t env;
7031 env.must_be_constant = false;
7032 initializer_t *initializer = parse_initializer(&env);
7035 expression->compound_literal.initializer = initializer;
7036 expression->compound_literal.type = type;
7037 expression->base.type = automatic_type_conversion(type);
7043 * Parse a cast expression.
7045 static expression_t *parse_cast(void)
7047 add_anchor_token(')');
7049 source_position_t source_position = token.source_position;
7051 type_t *type = parse_typename();
7053 rem_anchor_token(')');
7056 if (token.type == '{') {
7057 return parse_compound_literal(type);
7060 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7061 cast->base.source_position = source_position;
7063 expression_t *value = parse_sub_expression(PREC_CAST);
7064 cast->base.type = type;
7065 cast->unary.value = value;
7067 if (! semantic_cast(cast)) {
7068 /* TODO: record the error in the AST. else it is impossible to detect it */
7073 return create_invalid_expression();
7077 * Parse a statement expression.
7079 static expression_t *parse_statement_expression(void)
7081 add_anchor_token(')');
7083 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7085 statement_t *statement = parse_compound_statement(true);
7086 expression->statement.statement = statement;
7088 /* find last statement and use its type */
7089 type_t *type = type_void;
7090 const statement_t *stmt = statement->compound.statements;
7092 while (stmt->base.next != NULL)
7093 stmt = stmt->base.next;
7095 if (stmt->kind == STATEMENT_EXPRESSION) {
7096 type = stmt->expression.expression->base.type;
7098 } else if (warning.other) {
7099 warningf(&expression->base.source_position, "empty statement expression ({})");
7101 expression->base.type = type;
7103 rem_anchor_token(')');
7111 * Parse a parenthesized expression.
7113 static expression_t *parse_parenthesized_expression(void)
7117 switch (token.type) {
7119 /* gcc extension: a statement expression */
7120 return parse_statement_expression();
7124 return parse_cast();
7126 if (is_typedef_symbol(token.v.symbol)) {
7127 return parse_cast();
7131 add_anchor_token(')');
7132 expression_t *result = parse_expression();
7133 rem_anchor_token(')');
7140 static expression_t *parse_function_keyword(void)
7144 if (current_function == NULL) {
7145 errorf(HERE, "'__func__' used outside of a function");
7148 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7149 expression->base.type = type_char_ptr;
7150 expression->funcname.kind = FUNCNAME_FUNCTION;
7157 static expression_t *parse_pretty_function_keyword(void)
7159 if (current_function == NULL) {
7160 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7163 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7164 expression->base.type = type_char_ptr;
7165 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7167 eat(T___PRETTY_FUNCTION__);
7172 static expression_t *parse_funcsig_keyword(void)
7174 if (current_function == NULL) {
7175 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7178 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7179 expression->base.type = type_char_ptr;
7180 expression->funcname.kind = FUNCNAME_FUNCSIG;
7187 static expression_t *parse_funcdname_keyword(void)
7189 if (current_function == NULL) {
7190 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7193 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7194 expression->base.type = type_char_ptr;
7195 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7197 eat(T___FUNCDNAME__);
7202 static designator_t *parse_designator(void)
7204 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7205 result->source_position = *HERE;
7207 if (token.type != T_IDENTIFIER) {
7208 parse_error_expected("while parsing member designator",
7209 T_IDENTIFIER, NULL);
7212 result->symbol = token.v.symbol;
7215 designator_t *last_designator = result;
7217 if (token.type == '.') {
7219 if (token.type != T_IDENTIFIER) {
7220 parse_error_expected("while parsing member designator",
7221 T_IDENTIFIER, NULL);
7224 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7225 designator->source_position = *HERE;
7226 designator->symbol = token.v.symbol;
7229 last_designator->next = designator;
7230 last_designator = designator;
7233 if (token.type == '[') {
7235 add_anchor_token(']');
7236 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7237 designator->source_position = *HERE;
7238 designator->array_index = parse_expression();
7239 rem_anchor_token(']');
7241 if (designator->array_index == NULL) {
7245 last_designator->next = designator;
7246 last_designator = designator;
7258 * Parse the __builtin_offsetof() expression.
7260 static expression_t *parse_offsetof(void)
7262 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7263 expression->base.type = type_size_t;
7265 eat(T___builtin_offsetof);
7268 add_anchor_token(',');
7269 type_t *type = parse_typename();
7270 rem_anchor_token(',');
7272 add_anchor_token(')');
7273 designator_t *designator = parse_designator();
7274 rem_anchor_token(')');
7277 expression->offsetofe.type = type;
7278 expression->offsetofe.designator = designator;
7281 memset(&path, 0, sizeof(path));
7282 path.top_type = type;
7283 path.path = NEW_ARR_F(type_path_entry_t, 0);
7285 descend_into_subtype(&path);
7287 if (!walk_designator(&path, designator, true)) {
7288 return create_invalid_expression();
7291 DEL_ARR_F(path.path);
7295 return create_invalid_expression();
7299 * Parses a _builtin_va_start() expression.
7301 static expression_t *parse_va_start(void)
7303 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7305 eat(T___builtin_va_start);
7308 add_anchor_token(',');
7309 expression->va_starte.ap = parse_assignment_expression();
7310 rem_anchor_token(',');
7312 expression_t *const expr = parse_assignment_expression();
7313 if (expr->kind == EXPR_REFERENCE) {
7314 entity_t *const entity = expr->reference.entity;
7315 if (entity->base.parent_scope != ¤t_function->parameters
7316 || entity->base.next != NULL
7317 || entity->kind != ENTITY_VARIABLE) {
7318 errorf(&expr->base.source_position,
7319 "second argument of 'va_start' must be last parameter of the current function");
7321 expression->va_starte.parameter = &entity->variable;
7328 return create_invalid_expression();
7332 * Parses a _builtin_va_arg() expression.
7334 static expression_t *parse_va_arg(void)
7336 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7338 eat(T___builtin_va_arg);
7341 expression->va_arge.ap = parse_assignment_expression();
7343 expression->base.type = parse_typename();
7348 return create_invalid_expression();
7351 static expression_t *parse_builtin_symbol(void)
7353 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7355 symbol_t *symbol = token.v.symbol;
7357 expression->builtin_symbol.symbol = symbol;
7360 type_t *type = get_builtin_symbol_type(symbol);
7361 type = automatic_type_conversion(type);
7363 expression->base.type = type;
7368 * Parses a __builtin_constant() expression.
7370 static expression_t *parse_builtin_constant(void)
7372 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7374 eat(T___builtin_constant_p);
7377 add_anchor_token(')');
7378 expression->builtin_constant.value = parse_assignment_expression();
7379 rem_anchor_token(')');
7381 expression->base.type = type_int;
7385 return create_invalid_expression();
7389 * Parses a __builtin_prefetch() expression.
7391 static expression_t *parse_builtin_prefetch(void)
7393 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7395 eat(T___builtin_prefetch);
7398 add_anchor_token(')');
7399 expression->builtin_prefetch.adr = parse_assignment_expression();
7400 if (token.type == ',') {
7402 expression->builtin_prefetch.rw = parse_assignment_expression();
7404 if (token.type == ',') {
7406 expression->builtin_prefetch.locality = parse_assignment_expression();
7408 rem_anchor_token(')');
7410 expression->base.type = type_void;
7414 return create_invalid_expression();
7418 * Parses a __builtin_is_*() compare expression.
7420 static expression_t *parse_compare_builtin(void)
7422 expression_t *expression;
7424 switch (token.type) {
7425 case T___builtin_isgreater:
7426 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7428 case T___builtin_isgreaterequal:
7429 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7431 case T___builtin_isless:
7432 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7434 case T___builtin_islessequal:
7435 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7437 case T___builtin_islessgreater:
7438 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7440 case T___builtin_isunordered:
7441 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7444 internal_errorf(HERE, "invalid compare builtin found");
7446 expression->base.source_position = *HERE;
7450 expression->binary.left = parse_assignment_expression();
7452 expression->binary.right = parse_assignment_expression();
7455 type_t *const orig_type_left = expression->binary.left->base.type;
7456 type_t *const orig_type_right = expression->binary.right->base.type;
7458 type_t *const type_left = skip_typeref(orig_type_left);
7459 type_t *const type_right = skip_typeref(orig_type_right);
7460 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7461 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7462 type_error_incompatible("invalid operands in comparison",
7463 &expression->base.source_position, orig_type_left, orig_type_right);
7466 semantic_comparison(&expression->binary);
7471 return create_invalid_expression();
7476 * Parses a __builtin_expect() expression.
7478 static expression_t *parse_builtin_expect(void)
7480 expression_t *expression
7481 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7483 eat(T___builtin_expect);
7486 expression->binary.left = parse_assignment_expression();
7488 expression->binary.right = parse_constant_expression();
7491 expression->base.type = expression->binary.left->base.type;
7495 return create_invalid_expression();
7500 * Parses a MS assume() expression.
7502 static expression_t *parse_assume(void)
7504 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7509 add_anchor_token(')');
7510 expression->unary.value = parse_assignment_expression();
7511 rem_anchor_token(')');
7514 expression->base.type = type_void;
7517 return create_invalid_expression();
7521 * Return the declaration for a given label symbol or create a new one.
7523 * @param symbol the symbol of the label
7525 static label_t *get_label(symbol_t *symbol)
7528 assert(current_function != NULL);
7530 label = get_entity(symbol, NAMESPACE_LABEL);
7531 /* if we found a local label, we already created the declaration */
7532 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7533 if (label->base.parent_scope != current_scope) {
7534 assert(label->base.parent_scope->depth < current_scope->depth);
7535 current_function->goto_to_outer = true;
7537 return &label->label;
7540 label = get_entity(symbol, NAMESPACE_LABEL);
7541 /* if we found a label in the same function, then we already created the
7544 && label->base.parent_scope == ¤t_function->parameters) {
7545 return &label->label;
7548 /* otherwise we need to create a new one */
7549 label = allocate_entity_zero(ENTITY_LABEL);
7550 label->base.namespc = NAMESPACE_LABEL;
7551 label->base.symbol = symbol;
7555 return &label->label;
7559 * Parses a GNU && label address expression.
7561 static expression_t *parse_label_address(void)
7563 source_position_t source_position = token.source_position;
7565 if (token.type != T_IDENTIFIER) {
7566 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7569 symbol_t *symbol = token.v.symbol;
7572 label_t *label = get_label(symbol);
7574 label->address_taken = true;
7576 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7577 expression->base.source_position = source_position;
7579 /* label address is threaten as a void pointer */
7580 expression->base.type = type_void_ptr;
7581 expression->label_address.label = label;
7584 return create_invalid_expression();
7588 * Parse a microsoft __noop expression.
7590 static expression_t *parse_noop_expression(void)
7592 /* the result is a (int)0 */
7593 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7594 cnst->base.type = type_int;
7595 cnst->conste.v.int_value = 0;
7596 cnst->conste.is_ms_noop = true;
7600 if (token.type == '(') {
7601 /* parse arguments */
7603 add_anchor_token(')');
7604 add_anchor_token(',');
7606 if (token.type != ')') {
7608 (void)parse_assignment_expression();
7609 if (token.type != ',')
7615 rem_anchor_token(',');
7616 rem_anchor_token(')');
7624 * Parses a primary expression.
7626 static expression_t *parse_primary_expression(void)
7628 switch (token.type) {
7629 case T_false: return parse_bool_const(false);
7630 case T_true: return parse_bool_const(true);
7631 case T_INTEGER: return parse_int_const();
7632 case T_CHARACTER_CONSTANT: return parse_character_constant();
7633 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7634 case T_FLOATINGPOINT: return parse_float_const();
7635 case T_STRING_LITERAL:
7636 case T_WIDE_STRING_LITERAL: return parse_string_const();
7637 case T_IDENTIFIER: return parse_reference();
7638 case T___FUNCTION__:
7639 case T___func__: return parse_function_keyword();
7640 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7641 case T___FUNCSIG__: return parse_funcsig_keyword();
7642 case T___FUNCDNAME__: return parse_funcdname_keyword();
7643 case T___builtin_offsetof: return parse_offsetof();
7644 case T___builtin_va_start: return parse_va_start();
7645 case T___builtin_va_arg: return parse_va_arg();
7646 case T___builtin_expect:
7647 case T___builtin_alloca:
7648 case T___builtin_inf:
7649 case T___builtin_inff:
7650 case T___builtin_infl:
7651 case T___builtin_nan:
7652 case T___builtin_nanf:
7653 case T___builtin_nanl:
7654 case T___builtin_huge_val:
7655 case T___builtin_va_end: return parse_builtin_symbol();
7656 case T___builtin_isgreater:
7657 case T___builtin_isgreaterequal:
7658 case T___builtin_isless:
7659 case T___builtin_islessequal:
7660 case T___builtin_islessgreater:
7661 case T___builtin_isunordered: return parse_compare_builtin();
7662 case T___builtin_constant_p: return parse_builtin_constant();
7663 case T___builtin_prefetch: return parse_builtin_prefetch();
7664 case T__assume: return parse_assume();
7667 return parse_label_address();
7670 case '(': return parse_parenthesized_expression();
7671 case T___noop: return parse_noop_expression();
7674 errorf(HERE, "unexpected token %K, expected an expression", &token);
7675 return create_invalid_expression();
7679 * Check if the expression has the character type and issue a warning then.
7681 static void check_for_char_index_type(const expression_t *expression)
7683 type_t *const type = expression->base.type;
7684 const type_t *const base_type = skip_typeref(type);
7686 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7687 warning.char_subscripts) {
7688 warningf(&expression->base.source_position,
7689 "array subscript has type '%T'", type);
7693 static expression_t *parse_array_expression(expression_t *left)
7695 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7698 add_anchor_token(']');
7700 expression_t *inside = parse_expression();
7702 type_t *const orig_type_left = left->base.type;
7703 type_t *const orig_type_inside = inside->base.type;
7705 type_t *const type_left = skip_typeref(orig_type_left);
7706 type_t *const type_inside = skip_typeref(orig_type_inside);
7708 type_t *return_type;
7709 array_access_expression_t *array_access = &expression->array_access;
7710 if (is_type_pointer(type_left)) {
7711 return_type = type_left->pointer.points_to;
7712 array_access->array_ref = left;
7713 array_access->index = inside;
7714 check_for_char_index_type(inside);
7715 } else if (is_type_pointer(type_inside)) {
7716 return_type = type_inside->pointer.points_to;
7717 array_access->array_ref = inside;
7718 array_access->index = left;
7719 array_access->flipped = true;
7720 check_for_char_index_type(left);
7722 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7724 "array access on object with non-pointer types '%T', '%T'",
7725 orig_type_left, orig_type_inside);
7727 return_type = type_error_type;
7728 array_access->array_ref = left;
7729 array_access->index = inside;
7732 expression->base.type = automatic_type_conversion(return_type);
7734 rem_anchor_token(']');
7740 static expression_t *parse_typeprop(expression_kind_t const kind)
7742 expression_t *tp_expression = allocate_expression_zero(kind);
7743 tp_expression->base.type = type_size_t;
7745 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7747 /* we only refer to a type property, mark this case */
7748 bool old = in_type_prop;
7749 in_type_prop = true;
7752 expression_t *expression;
7753 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7755 add_anchor_token(')');
7756 orig_type = parse_typename();
7757 rem_anchor_token(')');
7760 if (token.type == '{') {
7761 /* It was not sizeof(type) after all. It is sizeof of an expression
7762 * starting with a compound literal */
7763 expression = parse_compound_literal(orig_type);
7764 goto typeprop_expression;
7767 expression = parse_sub_expression(PREC_UNARY);
7769 typeprop_expression:
7770 tp_expression->typeprop.tp_expression = expression;
7772 orig_type = revert_automatic_type_conversion(expression);
7773 expression->base.type = orig_type;
7776 tp_expression->typeprop.type = orig_type;
7777 type_t const* const type = skip_typeref(orig_type);
7778 char const* const wrong_type =
7779 is_type_incomplete(type) ? "incomplete" :
7780 type->kind == TYPE_FUNCTION ? "function designator" :
7781 type->kind == TYPE_BITFIELD ? "bitfield" :
7783 if (wrong_type != NULL) {
7784 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7785 errorf(&tp_expression->base.source_position,
7786 "operand of %s expression must not be of %s type '%T'",
7787 what, wrong_type, orig_type);
7792 return tp_expression;
7795 static expression_t *parse_sizeof(void)
7797 return parse_typeprop(EXPR_SIZEOF);
7800 static expression_t *parse_alignof(void)
7802 return parse_typeprop(EXPR_ALIGNOF);
7805 static expression_t *parse_select_expression(expression_t *compound)
7807 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7808 select->select.compound = compound;
7810 assert(token.type == '.' || token.type == T_MINUSGREATER);
7811 bool is_pointer = (token.type == T_MINUSGREATER);
7814 if (token.type != T_IDENTIFIER) {
7815 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7818 symbol_t *symbol = token.v.symbol;
7821 type_t *const orig_type = compound->base.type;
7822 type_t *const type = skip_typeref(orig_type);
7825 bool saw_error = false;
7826 if (is_type_pointer(type)) {
7829 "request for member '%Y' in something not a struct or union, but '%T'",
7833 type_left = skip_typeref(type->pointer.points_to);
7835 if (is_pointer && is_type_valid(type)) {
7836 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7843 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7844 type_left->kind == TYPE_COMPOUND_UNION) {
7845 compound_t *compound = type_left->compound.compound;
7847 if (!compound->complete) {
7848 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7850 goto create_error_entry;
7853 entry = find_compound_entry(compound, symbol);
7854 if (entry == NULL) {
7855 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7856 goto create_error_entry;
7859 if (is_type_valid(type_left) && !saw_error) {
7861 "request for member '%Y' in something not a struct or union, but '%T'",
7865 return create_invalid_expression();
7868 assert(is_declaration(entry));
7869 select->select.compound_entry = entry;
7871 type_t *entry_type = entry->declaration.type;
7873 = get_qualified_type(entry_type, type_left->base.qualifiers);
7875 /* we always do the auto-type conversions; the & and sizeof parser contains
7876 * code to revert this! */
7877 select->base.type = automatic_type_conversion(res_type);
7879 type_t *skipped = skip_typeref(res_type);
7880 if (skipped->kind == TYPE_BITFIELD) {
7881 select->base.type = skipped->bitfield.base_type;
7887 static void check_call_argument(const function_parameter_t *parameter,
7888 call_argument_t *argument, unsigned pos)
7890 type_t *expected_type = parameter->type;
7891 type_t *expected_type_skip = skip_typeref(expected_type);
7892 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7893 expression_t *arg_expr = argument->expression;
7894 type_t *arg_type = skip_typeref(arg_expr->base.type);
7896 /* handle transparent union gnu extension */
7897 if (is_type_union(expected_type_skip)
7898 && (expected_type_skip->base.modifiers
7899 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7900 compound_t *union_decl = expected_type_skip->compound.compound;
7901 type_t *best_type = NULL;
7902 entity_t *entry = union_decl->members.entities;
7903 for ( ; entry != NULL; entry = entry->base.next) {
7904 assert(is_declaration(entry));
7905 type_t *decl_type = entry->declaration.type;
7906 error = semantic_assign(decl_type, arg_expr);
7907 if (error == ASSIGN_ERROR_INCOMPATIBLE
7908 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7911 if (error == ASSIGN_SUCCESS) {
7912 best_type = decl_type;
7913 } else if (best_type == NULL) {
7914 best_type = decl_type;
7918 if (best_type != NULL) {
7919 expected_type = best_type;
7923 error = semantic_assign(expected_type, arg_expr);
7924 argument->expression = create_implicit_cast(argument->expression,
7927 if (error != ASSIGN_SUCCESS) {
7928 /* report exact scope in error messages (like "in argument 3") */
7930 snprintf(buf, sizeof(buf), "call argument %u", pos);
7931 report_assign_error(error, expected_type, arg_expr, buf,
7932 &arg_expr->base.source_position);
7933 } else if (warning.traditional || warning.conversion) {
7934 type_t *const promoted_type = get_default_promoted_type(arg_type);
7935 if (!types_compatible(expected_type_skip, promoted_type) &&
7936 !types_compatible(expected_type_skip, type_void_ptr) &&
7937 !types_compatible(type_void_ptr, promoted_type)) {
7938 /* Deliberately show the skipped types in this warning */
7939 warningf(&arg_expr->base.source_position,
7940 "passing call argument %u as '%T' rather than '%T' due to prototype",
7941 pos, expected_type_skip, promoted_type);
7947 * Parse a call expression, ie. expression '( ... )'.
7949 * @param expression the function address
7951 static expression_t *parse_call_expression(expression_t *expression)
7953 expression_t *result = allocate_expression_zero(EXPR_CALL);
7954 call_expression_t *call = &result->call;
7955 call->function = expression;
7957 type_t *const orig_type = expression->base.type;
7958 type_t *const type = skip_typeref(orig_type);
7960 function_type_t *function_type = NULL;
7961 if (is_type_pointer(type)) {
7962 type_t *const to_type = skip_typeref(type->pointer.points_to);
7964 if (is_type_function(to_type)) {
7965 function_type = &to_type->function;
7966 call->base.type = function_type->return_type;
7970 if (function_type == NULL && is_type_valid(type)) {
7971 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7974 /* parse arguments */
7976 add_anchor_token(')');
7977 add_anchor_token(',');
7979 if (token.type != ')') {
7980 call_argument_t *last_argument = NULL;
7983 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7985 argument->expression = parse_assignment_expression();
7986 if (last_argument == NULL) {
7987 call->arguments = argument;
7989 last_argument->next = argument;
7991 last_argument = argument;
7993 if (token.type != ',')
7998 rem_anchor_token(',');
7999 rem_anchor_token(')');
8002 if (function_type == NULL)
8005 function_parameter_t *parameter = function_type->parameters;
8006 call_argument_t *argument = call->arguments;
8007 if (!function_type->unspecified_parameters) {
8008 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8009 parameter = parameter->next, argument = argument->next) {
8010 check_call_argument(parameter, argument, ++pos);
8013 if (parameter != NULL) {
8014 errorf(HERE, "too few arguments to function '%E'", expression);
8015 } else if (argument != NULL && !function_type->variadic) {
8016 errorf(HERE, "too many arguments to function '%E'", expression);
8020 /* do default promotion */
8021 for (; argument != NULL; argument = argument->next) {
8022 type_t *type = argument->expression->base.type;
8024 type = get_default_promoted_type(type);
8026 argument->expression
8027 = create_implicit_cast(argument->expression, type);
8030 check_format(&result->call);
8032 if (warning.aggregate_return &&
8033 is_type_compound(skip_typeref(function_type->return_type))) {
8034 warningf(&result->base.source_position,
8035 "function call has aggregate value");
8042 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8044 static bool same_compound_type(const type_t *type1, const type_t *type2)
8047 is_type_compound(type1) &&
8048 type1->kind == type2->kind &&
8049 type1->compound.compound == type2->compound.compound;
8052 static expression_t const *get_reference_address(expression_t const *expr)
8054 bool regular_take_address = true;
8056 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8057 expr = expr->unary.value;
8059 regular_take_address = false;
8062 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8065 expr = expr->unary.value;
8068 if (expr->kind != EXPR_REFERENCE)
8071 /* special case for functions which are automatically converted to a
8072 * pointer to function without an extra TAKE_ADDRESS operation */
8073 if (!regular_take_address &&
8074 expr->reference.entity->kind != ENTITY_FUNCTION) {
8081 static void warn_reference_address_as_bool(expression_t const* expr)
8083 if (!warning.address)
8086 expr = get_reference_address(expr);
8088 warningf(&expr->base.source_position,
8089 "the address of '%Y' will always evaluate as 'true'",
8090 expr->reference.entity->base.symbol);
8094 static void semantic_condition(expression_t const *const expr,
8095 char const *const context)
8097 type_t *const type = skip_typeref(expr->base.type);
8098 if (is_type_scalar(type)) {
8099 warn_reference_address_as_bool(expr);
8100 } else if (is_type_valid(type)) {
8101 errorf(&expr->base.source_position,
8102 "%s must have scalar type", context);
8107 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8109 * @param expression the conditional expression
8111 static expression_t *parse_conditional_expression(expression_t *expression)
8113 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8115 conditional_expression_t *conditional = &result->conditional;
8116 conditional->condition = expression;
8119 add_anchor_token(':');
8121 /* §6.5.15:2 The first operand shall have scalar type. */
8122 semantic_condition(expression, "condition of conditional operator");
8124 expression_t *true_expression = expression;
8125 bool gnu_cond = false;
8126 if (GNU_MODE && token.type == ':') {
8129 true_expression = parse_expression();
8131 rem_anchor_token(':');
8133 expression_t *false_expression =
8134 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8136 type_t *const orig_true_type = true_expression->base.type;
8137 type_t *const orig_false_type = false_expression->base.type;
8138 type_t *const true_type = skip_typeref(orig_true_type);
8139 type_t *const false_type = skip_typeref(orig_false_type);
8142 type_t *result_type;
8143 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8144 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8145 /* ISO/IEC 14882:1998(E) §5.16:2 */
8146 if (true_expression->kind == EXPR_UNARY_THROW) {
8147 result_type = false_type;
8148 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8149 result_type = true_type;
8151 if (warning.other && (
8152 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8153 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8155 warningf(&conditional->base.source_position,
8156 "ISO C forbids conditional expression with only one void side");
8158 result_type = type_void;
8160 } else if (is_type_arithmetic(true_type)
8161 && is_type_arithmetic(false_type)) {
8162 result_type = semantic_arithmetic(true_type, false_type);
8164 true_expression = create_implicit_cast(true_expression, result_type);
8165 false_expression = create_implicit_cast(false_expression, result_type);
8167 conditional->true_expression = true_expression;
8168 conditional->false_expression = false_expression;
8169 conditional->base.type = result_type;
8170 } else if (same_compound_type(true_type, false_type)) {
8171 /* just take 1 of the 2 types */
8172 result_type = true_type;
8173 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8174 type_t *pointer_type;
8176 expression_t *other_expression;
8177 if (is_type_pointer(true_type) &&
8178 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8179 pointer_type = true_type;
8180 other_type = false_type;
8181 other_expression = false_expression;
8183 pointer_type = false_type;
8184 other_type = true_type;
8185 other_expression = true_expression;
8188 if (is_null_pointer_constant(other_expression)) {
8189 result_type = pointer_type;
8190 } else if (is_type_pointer(other_type)) {
8191 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8192 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8195 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8196 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8198 } else if (types_compatible(get_unqualified_type(to1),
8199 get_unqualified_type(to2))) {
8202 if (warning.other) {
8203 warningf(&conditional->base.source_position,
8204 "pointer types '%T' and '%T' in conditional expression are incompatible",
8205 true_type, false_type);
8210 type_t *const type =
8211 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8212 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8213 } else if (is_type_integer(other_type)) {
8214 if (warning.other) {
8215 warningf(&conditional->base.source_position,
8216 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8218 result_type = pointer_type;
8220 if (is_type_valid(other_type)) {
8221 type_error_incompatible("while parsing conditional",
8222 &expression->base.source_position, true_type, false_type);
8224 result_type = type_error_type;
8227 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8228 type_error_incompatible("while parsing conditional",
8229 &conditional->base.source_position, true_type,
8232 result_type = type_error_type;
8235 conditional->true_expression
8236 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8237 conditional->false_expression
8238 = create_implicit_cast(false_expression, result_type);
8239 conditional->base.type = result_type;
8242 return create_invalid_expression();
8246 * Parse an extension expression.
8248 static expression_t *parse_extension(void)
8250 eat(T___extension__);
8252 bool old_gcc_extension = in_gcc_extension;
8253 in_gcc_extension = true;
8254 expression_t *expression = parse_sub_expression(PREC_UNARY);
8255 in_gcc_extension = old_gcc_extension;
8260 * Parse a __builtin_classify_type() expression.
8262 static expression_t *parse_builtin_classify_type(void)
8264 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8265 result->base.type = type_int;
8267 eat(T___builtin_classify_type);
8270 add_anchor_token(')');
8271 expression_t *expression = parse_expression();
8272 rem_anchor_token(')');
8274 result->classify_type.type_expression = expression;
8278 return create_invalid_expression();
8282 * Parse a delete expression
8283 * ISO/IEC 14882:1998(E) §5.3.5
8285 static expression_t *parse_delete(void)
8287 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8288 result->base.type = type_void;
8292 if (token.type == '[') {
8294 result->kind = EXPR_UNARY_DELETE_ARRAY;
8299 expression_t *const value = parse_sub_expression(PREC_CAST);
8300 result->unary.value = value;
8302 type_t *const type = skip_typeref(value->base.type);
8303 if (!is_type_pointer(type)) {
8304 errorf(&value->base.source_position,
8305 "operand of delete must have pointer type");
8306 } else if (warning.other &&
8307 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8308 warningf(&value->base.source_position,
8309 "deleting 'void*' is undefined");
8316 * Parse a throw expression
8317 * ISO/IEC 14882:1998(E) §15:1
8319 static expression_t *parse_throw(void)
8321 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8322 result->base.type = type_void;
8326 expression_t *value = NULL;
8327 switch (token.type) {
8329 value = parse_assignment_expression();
8330 /* ISO/IEC 14882:1998(E) §15.1:3 */
8331 type_t *const orig_type = value->base.type;
8332 type_t *const type = skip_typeref(orig_type);
8333 if (is_type_incomplete(type)) {
8334 errorf(&value->base.source_position,
8335 "cannot throw object of incomplete type '%T'", orig_type);
8336 } else if (is_type_pointer(type)) {
8337 type_t *const points_to = skip_typeref(type->pointer.points_to);
8338 if (is_type_incomplete(points_to) &&
8339 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8340 errorf(&value->base.source_position,
8341 "cannot throw pointer to incomplete type '%T'", orig_type);
8349 result->unary.value = value;
8354 static bool check_pointer_arithmetic(const source_position_t *source_position,
8355 type_t *pointer_type,
8356 type_t *orig_pointer_type)
8358 type_t *points_to = pointer_type->pointer.points_to;
8359 points_to = skip_typeref(points_to);
8361 if (is_type_incomplete(points_to)) {
8362 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8363 errorf(source_position,
8364 "arithmetic with pointer to incomplete type '%T' not allowed",
8367 } else if (warning.pointer_arith) {
8368 warningf(source_position,
8369 "pointer of type '%T' used in arithmetic",
8372 } else if (is_type_function(points_to)) {
8374 errorf(source_position,
8375 "arithmetic with pointer to function type '%T' not allowed",
8378 } else if (warning.pointer_arith) {
8379 warningf(source_position,
8380 "pointer to a function '%T' used in arithmetic",
8387 static bool is_lvalue(const expression_t *expression)
8389 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8390 switch (expression->kind) {
8391 case EXPR_REFERENCE:
8392 case EXPR_ARRAY_ACCESS:
8394 case EXPR_UNARY_DEREFERENCE:
8398 type_t *type = skip_typeref(expression->base.type);
8400 /* ISO/IEC 14882:1998(E) §3.10:3 */
8401 is_type_reference(type) ||
8402 /* Claim it is an lvalue, if the type is invalid. There was a parse
8403 * error before, which maybe prevented properly recognizing it as
8405 !is_type_valid(type);
8410 static void semantic_incdec(unary_expression_t *expression)
8412 type_t *const orig_type = expression->value->base.type;
8413 type_t *const type = skip_typeref(orig_type);
8414 if (is_type_pointer(type)) {
8415 if (!check_pointer_arithmetic(&expression->base.source_position,
8419 } else if (!is_type_real(type) && is_type_valid(type)) {
8420 /* TODO: improve error message */
8421 errorf(&expression->base.source_position,
8422 "operation needs an arithmetic or pointer type");
8425 if (!is_lvalue(expression->value)) {
8426 /* TODO: improve error message */
8427 errorf(&expression->base.source_position, "lvalue required as operand");
8429 expression->base.type = orig_type;
8432 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8434 type_t *const orig_type = expression->value->base.type;
8435 type_t *const type = skip_typeref(orig_type);
8436 if (!is_type_arithmetic(type)) {
8437 if (is_type_valid(type)) {
8438 /* TODO: improve error message */
8439 errorf(&expression->base.source_position,
8440 "operation needs an arithmetic type");
8445 expression->base.type = orig_type;
8448 static void semantic_unexpr_plus(unary_expression_t *expression)
8450 semantic_unexpr_arithmetic(expression);
8451 if (warning.traditional)
8452 warningf(&expression->base.source_position,
8453 "traditional C rejects the unary plus operator");
8456 static void semantic_not(unary_expression_t *expression)
8458 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8459 semantic_condition(expression->value, "operand of !");
8460 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8463 static void semantic_unexpr_integer(unary_expression_t *expression)
8465 type_t *const orig_type = expression->value->base.type;
8466 type_t *const type = skip_typeref(orig_type);
8467 if (!is_type_integer(type)) {
8468 if (is_type_valid(type)) {
8469 errorf(&expression->base.source_position,
8470 "operand of ~ must be of integer type");
8475 expression->base.type = orig_type;
8478 static void semantic_dereference(unary_expression_t *expression)
8480 type_t *const orig_type = expression->value->base.type;
8481 type_t *const type = skip_typeref(orig_type);
8482 if (!is_type_pointer(type)) {
8483 if (is_type_valid(type)) {
8484 errorf(&expression->base.source_position,
8485 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8490 type_t *result_type = type->pointer.points_to;
8491 result_type = automatic_type_conversion(result_type);
8492 expression->base.type = result_type;
8496 * Record that an address is taken (expression represents an lvalue).
8498 * @param expression the expression
8499 * @param may_be_register if true, the expression might be an register
8501 static void set_address_taken(expression_t *expression, bool may_be_register)
8503 if (expression->kind != EXPR_REFERENCE)
8506 entity_t *const entity = expression->reference.entity;
8508 if (entity->kind != ENTITY_VARIABLE)
8511 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8512 && !may_be_register) {
8513 errorf(&expression->base.source_position,
8514 "address of register variable '%Y' requested",
8515 entity->base.symbol);
8518 entity->variable.address_taken = true;
8522 * Check the semantic of the address taken expression.
8524 static void semantic_take_addr(unary_expression_t *expression)
8526 expression_t *value = expression->value;
8527 value->base.type = revert_automatic_type_conversion(value);
8529 type_t *orig_type = value->base.type;
8530 type_t *type = skip_typeref(orig_type);
8531 if (!is_type_valid(type))
8535 if (!is_lvalue(value)) {
8536 errorf(&expression->base.source_position, "'&' requires an lvalue");
8538 if (type->kind == TYPE_BITFIELD) {
8539 errorf(&expression->base.source_position,
8540 "'&' not allowed on object with bitfield type '%T'",
8544 set_address_taken(value, false);
8546 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8549 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8550 static expression_t *parse_##unexpression_type(void) \
8552 expression_t *unary_expression \
8553 = allocate_expression_zero(unexpression_type); \
8555 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8557 sfunc(&unary_expression->unary); \
8559 return unary_expression; \
8562 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8563 semantic_unexpr_arithmetic)
8564 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8565 semantic_unexpr_plus)
8566 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8568 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8569 semantic_dereference)
8570 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8572 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8573 semantic_unexpr_integer)
8574 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8576 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8579 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8581 static expression_t *parse_##unexpression_type(expression_t *left) \
8583 expression_t *unary_expression \
8584 = allocate_expression_zero(unexpression_type); \
8586 unary_expression->unary.value = left; \
8588 sfunc(&unary_expression->unary); \
8590 return unary_expression; \
8593 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8594 EXPR_UNARY_POSTFIX_INCREMENT,
8596 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8597 EXPR_UNARY_POSTFIX_DECREMENT,
8600 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8602 /* TODO: handle complex + imaginary types */
8604 type_left = get_unqualified_type(type_left);
8605 type_right = get_unqualified_type(type_right);
8607 /* § 6.3.1.8 Usual arithmetic conversions */
8608 if (type_left == type_long_double || type_right == type_long_double) {
8609 return type_long_double;
8610 } else if (type_left == type_double || type_right == type_double) {
8612 } else if (type_left == type_float || type_right == type_float) {
8616 type_left = promote_integer(type_left);
8617 type_right = promote_integer(type_right);
8619 if (type_left == type_right)
8622 bool const signed_left = is_type_signed(type_left);
8623 bool const signed_right = is_type_signed(type_right);
8624 int const rank_left = get_rank(type_left);
8625 int const rank_right = get_rank(type_right);
8627 if (signed_left == signed_right)
8628 return rank_left >= rank_right ? type_left : type_right;
8637 u_rank = rank_right;
8638 u_type = type_right;
8640 s_rank = rank_right;
8641 s_type = type_right;
8646 if (u_rank >= s_rank)
8649 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8651 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8652 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8656 case ATOMIC_TYPE_INT: return type_unsigned_int;
8657 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8658 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8660 default: panic("invalid atomic type");
8665 * Check the semantic restrictions for a binary expression.
8667 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8669 expression_t *const left = expression->left;
8670 expression_t *const right = expression->right;
8671 type_t *const orig_type_left = left->base.type;
8672 type_t *const orig_type_right = right->base.type;
8673 type_t *const type_left = skip_typeref(orig_type_left);
8674 type_t *const type_right = skip_typeref(orig_type_right);
8676 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8677 /* TODO: improve error message */
8678 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8679 errorf(&expression->base.source_position,
8680 "operation needs arithmetic types");
8685 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8686 expression->left = create_implicit_cast(left, arithmetic_type);
8687 expression->right = create_implicit_cast(right, arithmetic_type);
8688 expression->base.type = arithmetic_type;
8691 static void warn_div_by_zero(binary_expression_t const *const expression)
8693 if (!warning.div_by_zero ||
8694 !is_type_integer(expression->base.type))
8697 expression_t const *const right = expression->right;
8698 /* The type of the right operand can be different for /= */
8699 if (is_type_integer(right->base.type) &&
8700 is_constant_expression(right) &&
8701 fold_constant(right) == 0) {
8702 warningf(&expression->base.source_position, "division by zero");
8707 * Check the semantic restrictions for a div/mod expression.
8709 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8710 semantic_binexpr_arithmetic(expression);
8711 warn_div_by_zero(expression);
8714 static void semantic_shift_op(binary_expression_t *expression)
8716 expression_t *const left = expression->left;
8717 expression_t *const right = expression->right;
8718 type_t *const orig_type_left = left->base.type;
8719 type_t *const orig_type_right = right->base.type;
8720 type_t * type_left = skip_typeref(orig_type_left);
8721 type_t * type_right = skip_typeref(orig_type_right);
8723 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8724 /* TODO: improve error message */
8725 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8726 errorf(&expression->base.source_position,
8727 "operands of shift operation must have integer types");
8732 type_left = promote_integer(type_left);
8733 type_right = promote_integer(type_right);
8735 expression->left = create_implicit_cast(left, type_left);
8736 expression->right = create_implicit_cast(right, type_right);
8737 expression->base.type = type_left;
8740 static void semantic_add(binary_expression_t *expression)
8742 expression_t *const left = expression->left;
8743 expression_t *const right = expression->right;
8744 type_t *const orig_type_left = left->base.type;
8745 type_t *const orig_type_right = right->base.type;
8746 type_t *const type_left = skip_typeref(orig_type_left);
8747 type_t *const type_right = skip_typeref(orig_type_right);
8750 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8751 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8752 expression->left = create_implicit_cast(left, arithmetic_type);
8753 expression->right = create_implicit_cast(right, arithmetic_type);
8754 expression->base.type = arithmetic_type;
8756 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8757 check_pointer_arithmetic(&expression->base.source_position,
8758 type_left, orig_type_left);
8759 expression->base.type = type_left;
8760 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8761 check_pointer_arithmetic(&expression->base.source_position,
8762 type_right, orig_type_right);
8763 expression->base.type = type_right;
8764 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8765 errorf(&expression->base.source_position,
8766 "invalid operands to binary + ('%T', '%T')",
8767 orig_type_left, orig_type_right);
8771 static void semantic_sub(binary_expression_t *expression)
8773 expression_t *const left = expression->left;
8774 expression_t *const right = expression->right;
8775 type_t *const orig_type_left = left->base.type;
8776 type_t *const orig_type_right = right->base.type;
8777 type_t *const type_left = skip_typeref(orig_type_left);
8778 type_t *const type_right = skip_typeref(orig_type_right);
8779 source_position_t const *const pos = &expression->base.source_position;
8782 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8783 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8784 expression->left = create_implicit_cast(left, arithmetic_type);
8785 expression->right = create_implicit_cast(right, arithmetic_type);
8786 expression->base.type = arithmetic_type;
8788 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8789 check_pointer_arithmetic(&expression->base.source_position,
8790 type_left, orig_type_left);
8791 expression->base.type = type_left;
8792 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8793 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8794 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8795 if (!types_compatible(unqual_left, unqual_right)) {
8797 "subtracting pointers to incompatible types '%T' and '%T'",
8798 orig_type_left, orig_type_right);
8799 } else if (!is_type_object(unqual_left)) {
8800 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8801 errorf(pos, "subtracting pointers to non-object types '%T'",
8803 } else if (warning.other) {
8804 warningf(pos, "subtracting pointers to void");
8807 expression->base.type = type_ptrdiff_t;
8808 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8809 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8810 orig_type_left, orig_type_right);
8814 static void warn_string_literal_address(expression_t const* expr)
8816 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8817 expr = expr->unary.value;
8818 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8820 expr = expr->unary.value;
8823 if (expr->kind == EXPR_STRING_LITERAL ||
8824 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8825 warningf(&expr->base.source_position,
8826 "comparison with string literal results in unspecified behaviour");
8831 * Check the semantics of comparison expressions.
8833 * @param expression The expression to check.
8835 static void semantic_comparison(binary_expression_t *expression)
8837 expression_t *left = expression->left;
8838 expression_t *right = expression->right;
8840 if (warning.address) {
8841 warn_string_literal_address(left);
8842 warn_string_literal_address(right);
8844 expression_t const* const func_left = get_reference_address(left);
8845 if (func_left != NULL && is_null_pointer_constant(right)) {
8846 warningf(&expression->base.source_position,
8847 "the address of '%Y' will never be NULL",
8848 func_left->reference.entity->base.symbol);
8851 expression_t const* const func_right = get_reference_address(right);
8852 if (func_right != NULL && is_null_pointer_constant(right)) {
8853 warningf(&expression->base.source_position,
8854 "the address of '%Y' will never be NULL",
8855 func_right->reference.entity->base.symbol);
8859 type_t *orig_type_left = left->base.type;
8860 type_t *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 /* TODO non-arithmetic types */
8865 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8866 /* test for signed vs unsigned compares */
8867 if (warning.sign_compare &&
8868 (expression->base.kind != EXPR_BINARY_EQUAL &&
8869 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
8870 (is_type_signed(type_left) != is_type_signed(type_right))) {
8872 /* check if 1 of the operands is a constant, in this case we just
8873 * check wether we can safely represent the resulting constant in
8874 * the type of the other operand. */
8875 expression_t *const_expr = NULL;
8876 expression_t *other_expr = NULL;
8878 if (is_constant_expression(left)) {
8881 } else if (is_constant_expression(right)) {
8886 if (const_expr != NULL) {
8887 type_t *other_type = skip_typeref(other_expr->base.type);
8888 long val = fold_constant(const_expr);
8889 /* TODO: check if val can be represented by other_type */
8893 warningf(&expression->base.source_position,
8894 "comparison between signed and unsigned");
8896 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8897 expression->left = create_implicit_cast(left, arithmetic_type);
8898 expression->right = create_implicit_cast(right, arithmetic_type);
8899 expression->base.type = arithmetic_type;
8900 if (warning.float_equal &&
8901 (expression->base.kind == EXPR_BINARY_EQUAL ||
8902 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8903 is_type_float(arithmetic_type)) {
8904 warningf(&expression->base.source_position,
8905 "comparing floating point with == or != is unsafe");
8907 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8908 /* TODO check compatibility */
8909 } else if (is_type_pointer(type_left)) {
8910 expression->right = create_implicit_cast(right, type_left);
8911 } else if (is_type_pointer(type_right)) {
8912 expression->left = create_implicit_cast(left, type_right);
8913 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8914 type_error_incompatible("invalid operands in comparison",
8915 &expression->base.source_position,
8916 type_left, type_right);
8918 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8922 * Checks if a compound type has constant fields.
8924 static bool has_const_fields(const compound_type_t *type)
8926 compound_t *compound = type->compound;
8927 entity_t *entry = compound->members.entities;
8929 for (; entry != NULL; entry = entry->base.next) {
8930 if (!is_declaration(entry))
8933 const type_t *decl_type = skip_typeref(entry->declaration.type);
8934 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8941 static bool is_valid_assignment_lhs(expression_t const* const left)
8943 type_t *const orig_type_left = revert_automatic_type_conversion(left);
8944 type_t *const type_left = skip_typeref(orig_type_left);
8946 if (!is_lvalue(left)) {
8947 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8952 if (is_type_array(type_left)) {
8953 errorf(HERE, "cannot assign to arrays ('%E')", left);
8956 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8957 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8961 if (is_type_incomplete(type_left)) {
8962 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8963 left, orig_type_left);
8966 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
8967 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
8968 left, orig_type_left);
8975 static void semantic_arithmetic_assign(binary_expression_t *expression)
8977 expression_t *left = expression->left;
8978 expression_t *right = expression->right;
8979 type_t *orig_type_left = left->base.type;
8980 type_t *orig_type_right = right->base.type;
8982 if (!is_valid_assignment_lhs(left))
8985 type_t *type_left = skip_typeref(orig_type_left);
8986 type_t *type_right = skip_typeref(orig_type_right);
8988 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8989 /* TODO: improve error message */
8990 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8991 errorf(&expression->base.source_position,
8992 "operation needs arithmetic types");
8997 /* combined instructions are tricky. We can't create an implicit cast on
8998 * the left side, because we need the uncasted form for the store.
8999 * The ast2firm pass has to know that left_type must be right_type
9000 * for the arithmetic operation and create a cast by itself */
9001 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9002 expression->right = create_implicit_cast(right, arithmetic_type);
9003 expression->base.type = type_left;
9006 static void semantic_divmod_assign(binary_expression_t *expression)
9008 semantic_arithmetic_assign(expression);
9009 warn_div_by_zero(expression);
9012 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9014 expression_t *const left = expression->left;
9015 expression_t *const right = expression->right;
9016 type_t *const orig_type_left = left->base.type;
9017 type_t *const orig_type_right = right->base.type;
9018 type_t *const type_left = skip_typeref(orig_type_left);
9019 type_t *const type_right = skip_typeref(orig_type_right);
9021 if (!is_valid_assignment_lhs(left))
9024 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9025 /* combined instructions are tricky. We can't create an implicit cast on
9026 * the left side, because we need the uncasted form for the store.
9027 * The ast2firm pass has to know that left_type must be right_type
9028 * for the arithmetic operation and create a cast by itself */
9029 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9030 expression->right = create_implicit_cast(right, arithmetic_type);
9031 expression->base.type = type_left;
9032 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9033 check_pointer_arithmetic(&expression->base.source_position,
9034 type_left, orig_type_left);
9035 expression->base.type = type_left;
9036 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9037 errorf(&expression->base.source_position,
9038 "incompatible types '%T' and '%T' in assignment",
9039 orig_type_left, orig_type_right);
9044 * Check the semantic restrictions of a logical expression.
9046 static void semantic_logical_op(binary_expression_t *expression)
9048 /* §6.5.13:2 Each of the operands shall have scalar type.
9049 * §6.5.14:2 Each of the operands shall have scalar type. */
9050 semantic_condition(expression->left, "left operand of logical operator");
9051 semantic_condition(expression->right, "right operand of logical operator");
9052 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9056 * Check the semantic restrictions of a binary assign expression.
9058 static void semantic_binexpr_assign(binary_expression_t *expression)
9060 expression_t *left = expression->left;
9061 type_t *orig_type_left = left->base.type;
9063 if (!is_valid_assignment_lhs(left))
9066 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9067 report_assign_error(error, orig_type_left, expression->right,
9068 "assignment", &left->base.source_position);
9069 expression->right = create_implicit_cast(expression->right, orig_type_left);
9070 expression->base.type = orig_type_left;
9074 * Determine if the outermost operation (or parts thereof) of the given
9075 * expression has no effect in order to generate a warning about this fact.
9076 * Therefore in some cases this only examines some of the operands of the
9077 * expression (see comments in the function and examples below).
9079 * f() + 23; // warning, because + has no effect
9080 * x || f(); // no warning, because x controls execution of f()
9081 * x ? y : f(); // warning, because y has no effect
9082 * (void)x; // no warning to be able to suppress the warning
9083 * This function can NOT be used for an "expression has definitely no effect"-
9085 static bool expression_has_effect(const expression_t *const expr)
9087 switch (expr->kind) {
9088 case EXPR_UNKNOWN: break;
9089 case EXPR_INVALID: return true; /* do NOT warn */
9090 case EXPR_REFERENCE: return false;
9091 case EXPR_REFERENCE_ENUM_VALUE: return false;
9092 /* suppress the warning for microsoft __noop operations */
9093 case EXPR_CONST: return expr->conste.is_ms_noop;
9094 case EXPR_CHARACTER_CONSTANT: return false;
9095 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9096 case EXPR_STRING_LITERAL: return false;
9097 case EXPR_WIDE_STRING_LITERAL: return false;
9098 case EXPR_LABEL_ADDRESS: return false;
9101 const call_expression_t *const call = &expr->call;
9102 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9105 switch (call->function->builtin_symbol.symbol->ID) {
9106 case T___builtin_va_end: return true;
9107 default: return false;
9111 /* Generate the warning if either the left or right hand side of a
9112 * conditional expression has no effect */
9113 case EXPR_CONDITIONAL: {
9114 const conditional_expression_t *const cond = &expr->conditional;
9116 expression_has_effect(cond->true_expression) &&
9117 expression_has_effect(cond->false_expression);
9120 case EXPR_SELECT: return false;
9121 case EXPR_ARRAY_ACCESS: return false;
9122 case EXPR_SIZEOF: return false;
9123 case EXPR_CLASSIFY_TYPE: return false;
9124 case EXPR_ALIGNOF: return false;
9126 case EXPR_FUNCNAME: return false;
9127 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9128 case EXPR_BUILTIN_CONSTANT_P: return false;
9129 case EXPR_BUILTIN_PREFETCH: return true;
9130 case EXPR_OFFSETOF: return false;
9131 case EXPR_VA_START: return true;
9132 case EXPR_VA_ARG: return true;
9133 case EXPR_STATEMENT: return true; // TODO
9134 case EXPR_COMPOUND_LITERAL: return false;
9136 case EXPR_UNARY_NEGATE: return false;
9137 case EXPR_UNARY_PLUS: return false;
9138 case EXPR_UNARY_BITWISE_NEGATE: return false;
9139 case EXPR_UNARY_NOT: return false;
9140 case EXPR_UNARY_DEREFERENCE: return false;
9141 case EXPR_UNARY_TAKE_ADDRESS: return false;
9142 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9143 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9144 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9145 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9147 /* Treat void casts as if they have an effect in order to being able to
9148 * suppress the warning */
9149 case EXPR_UNARY_CAST: {
9150 type_t *const type = skip_typeref(expr->base.type);
9151 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9154 case EXPR_UNARY_CAST_IMPLICIT: return true;
9155 case EXPR_UNARY_ASSUME: return true;
9156 case EXPR_UNARY_DELETE: return true;
9157 case EXPR_UNARY_DELETE_ARRAY: return true;
9158 case EXPR_UNARY_THROW: return true;
9160 case EXPR_BINARY_ADD: return false;
9161 case EXPR_BINARY_SUB: return false;
9162 case EXPR_BINARY_MUL: return false;
9163 case EXPR_BINARY_DIV: return false;
9164 case EXPR_BINARY_MOD: return false;
9165 case EXPR_BINARY_EQUAL: return false;
9166 case EXPR_BINARY_NOTEQUAL: return false;
9167 case EXPR_BINARY_LESS: return false;
9168 case EXPR_BINARY_LESSEQUAL: return false;
9169 case EXPR_BINARY_GREATER: return false;
9170 case EXPR_BINARY_GREATEREQUAL: return false;
9171 case EXPR_BINARY_BITWISE_AND: return false;
9172 case EXPR_BINARY_BITWISE_OR: return false;
9173 case EXPR_BINARY_BITWISE_XOR: return false;
9174 case EXPR_BINARY_SHIFTLEFT: return false;
9175 case EXPR_BINARY_SHIFTRIGHT: return false;
9176 case EXPR_BINARY_ASSIGN: return true;
9177 case EXPR_BINARY_MUL_ASSIGN: return true;
9178 case EXPR_BINARY_DIV_ASSIGN: return true;
9179 case EXPR_BINARY_MOD_ASSIGN: return true;
9180 case EXPR_BINARY_ADD_ASSIGN: return true;
9181 case EXPR_BINARY_SUB_ASSIGN: return true;
9182 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9183 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9184 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9185 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9186 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9188 /* Only examine the right hand side of && and ||, because the left hand
9189 * side already has the effect of controlling the execution of the right
9191 case EXPR_BINARY_LOGICAL_AND:
9192 case EXPR_BINARY_LOGICAL_OR:
9193 /* Only examine the right hand side of a comma expression, because the left
9194 * hand side has a separate warning */
9195 case EXPR_BINARY_COMMA:
9196 return expression_has_effect(expr->binary.right);
9198 case EXPR_BINARY_BUILTIN_EXPECT: return true;
9199 case EXPR_BINARY_ISGREATER: return false;
9200 case EXPR_BINARY_ISGREATEREQUAL: return false;
9201 case EXPR_BINARY_ISLESS: return false;
9202 case EXPR_BINARY_ISLESSEQUAL: return false;
9203 case EXPR_BINARY_ISLESSGREATER: return false;
9204 case EXPR_BINARY_ISUNORDERED: return false;
9207 internal_errorf(HERE, "unexpected expression");
9210 static void semantic_comma(binary_expression_t *expression)
9212 if (warning.unused_value) {
9213 const expression_t *const left = expression->left;
9214 if (!expression_has_effect(left)) {
9215 warningf(&left->base.source_position,
9216 "left-hand operand of comma expression has no effect");
9219 expression->base.type = expression->right->base.type;
9223 * @param prec_r precedence of the right operand
9225 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9226 static expression_t *parse_##binexpression_type(expression_t *left) \
9228 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9229 binexpr->binary.left = left; \
9232 expression_t *right = parse_sub_expression(prec_r); \
9234 binexpr->binary.right = right; \
9235 sfunc(&binexpr->binary); \
9240 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9241 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9242 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9243 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9244 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9245 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9246 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9247 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9248 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9249 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9250 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9251 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9252 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9253 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9254 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9255 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9256 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9257 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9258 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9259 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9260 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9261 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9262 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9263 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9264 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9265 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9266 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9267 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9268 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9269 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9272 static expression_t *parse_sub_expression(precedence_t precedence)
9274 if (token.type < 0) {
9275 return expected_expression_error();
9278 expression_parser_function_t *parser
9279 = &expression_parsers[token.type];
9280 source_position_t source_position = token.source_position;
9283 if (parser->parser != NULL) {
9284 left = parser->parser();
9286 left = parse_primary_expression();
9288 assert(left != NULL);
9289 left->base.source_position = source_position;
9292 if (token.type < 0) {
9293 return expected_expression_error();
9296 parser = &expression_parsers[token.type];
9297 if (parser->infix_parser == NULL)
9299 if (parser->infix_precedence < precedence)
9302 left = parser->infix_parser(left);
9304 assert(left != NULL);
9305 assert(left->kind != EXPR_UNKNOWN);
9306 left->base.source_position = source_position;
9313 * Parse an expression.
9315 static expression_t *parse_expression(void)
9317 return parse_sub_expression(PREC_EXPRESSION);
9321 * Register a parser for a prefix-like operator.
9323 * @param parser the parser function
9324 * @param token_type the token type of the prefix token
9326 static void register_expression_parser(parse_expression_function parser,
9329 expression_parser_function_t *entry = &expression_parsers[token_type];
9331 if (entry->parser != NULL) {
9332 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9333 panic("trying to register multiple expression parsers for a token");
9335 entry->parser = parser;
9339 * Register a parser for an infix operator with given precedence.
9341 * @param parser the parser function
9342 * @param token_type the token type of the infix operator
9343 * @param precedence the precedence of the operator
9345 static void register_infix_parser(parse_expression_infix_function parser,
9346 int token_type, unsigned precedence)
9348 expression_parser_function_t *entry = &expression_parsers[token_type];
9350 if (entry->infix_parser != NULL) {
9351 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9352 panic("trying to register multiple infix expression parsers for a "
9355 entry->infix_parser = parser;
9356 entry->infix_precedence = precedence;
9360 * Initialize the expression parsers.
9362 static void init_expression_parsers(void)
9364 memset(&expression_parsers, 0, sizeof(expression_parsers));
9366 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9367 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9368 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9369 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9370 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9371 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9372 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9373 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9374 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9375 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9376 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9377 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9378 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9379 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9380 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9381 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9382 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9383 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9384 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9385 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9386 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9387 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9388 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9389 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9390 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9391 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9392 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9393 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9394 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9395 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9396 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9397 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9398 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9399 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9400 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9401 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9402 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9404 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9405 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9406 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9407 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9408 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9409 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9410 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9411 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9412 register_expression_parser(parse_sizeof, T_sizeof);
9413 register_expression_parser(parse_alignof, T___alignof__);
9414 register_expression_parser(parse_extension, T___extension__);
9415 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9416 register_expression_parser(parse_delete, T_delete);
9417 register_expression_parser(parse_throw, T_throw);
9421 * Parse a asm statement arguments specification.
9423 static asm_argument_t *parse_asm_arguments(bool is_out)
9425 asm_argument_t *result = NULL;
9426 asm_argument_t **anchor = &result;
9428 while (token.type == T_STRING_LITERAL || token.type == '[') {
9429 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9430 memset(argument, 0, sizeof(argument[0]));
9432 if (token.type == '[') {
9434 if (token.type != T_IDENTIFIER) {
9435 parse_error_expected("while parsing asm argument",
9436 T_IDENTIFIER, NULL);
9439 argument->symbol = token.v.symbol;
9444 argument->constraints = parse_string_literals();
9446 add_anchor_token(')');
9447 expression_t *expression = parse_expression();
9448 rem_anchor_token(')');
9450 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9451 * change size or type representation (e.g. int -> long is ok, but
9452 * int -> float is not) */
9453 if (expression->kind == EXPR_UNARY_CAST) {
9454 type_t *const type = expression->base.type;
9455 type_kind_t const kind = type->kind;
9456 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9459 if (kind == TYPE_ATOMIC) {
9460 atomic_type_kind_t const akind = type->atomic.akind;
9461 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9462 size = get_atomic_type_size(akind);
9464 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9465 size = get_atomic_type_size(get_intptr_kind());
9469 expression_t *const value = expression->unary.value;
9470 type_t *const value_type = value->base.type;
9471 type_kind_t const value_kind = value_type->kind;
9473 unsigned value_flags;
9474 unsigned value_size;
9475 if (value_kind == TYPE_ATOMIC) {
9476 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9477 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9478 value_size = get_atomic_type_size(value_akind);
9479 } else if (value_kind == TYPE_POINTER) {
9480 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9481 value_size = get_atomic_type_size(get_intptr_kind());
9486 if (value_flags != flags || value_size != size)
9490 } while (expression->kind == EXPR_UNARY_CAST);
9494 if (!is_lvalue(expression)) {
9495 errorf(&expression->base.source_position,
9496 "asm output argument is not an lvalue");
9499 if (argument->constraints.begin[0] == '+')
9500 mark_vars_read(expression, NULL);
9502 mark_vars_read(expression, NULL);
9504 argument->expression = expression;
9507 set_address_taken(expression, true);
9510 anchor = &argument->next;
9512 if (token.type != ',')
9523 * Parse a asm statement clobber specification.
9525 static asm_clobber_t *parse_asm_clobbers(void)
9527 asm_clobber_t *result = NULL;
9528 asm_clobber_t *last = NULL;
9530 while (token.type == T_STRING_LITERAL) {
9531 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9532 clobber->clobber = parse_string_literals();
9535 last->next = clobber;
9541 if (token.type != ',')
9550 * Parse an asm statement.
9552 static statement_t *parse_asm_statement(void)
9554 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9555 asm_statement_t *asm_statement = &statement->asms;
9559 if (token.type == T_volatile) {
9561 asm_statement->is_volatile = true;
9565 add_anchor_token(')');
9566 add_anchor_token(':');
9567 asm_statement->asm_text = parse_string_literals();
9569 if (token.type != ':') {
9570 rem_anchor_token(':');
9575 asm_statement->outputs = parse_asm_arguments(true);
9576 if (token.type != ':') {
9577 rem_anchor_token(':');
9582 asm_statement->inputs = parse_asm_arguments(false);
9583 if (token.type != ':') {
9584 rem_anchor_token(':');
9587 rem_anchor_token(':');
9590 asm_statement->clobbers = parse_asm_clobbers();
9593 rem_anchor_token(')');
9597 if (asm_statement->outputs == NULL) {
9598 /* GCC: An 'asm' instruction without any output operands will be treated
9599 * identically to a volatile 'asm' instruction. */
9600 asm_statement->is_volatile = true;
9605 return create_invalid_statement();
9609 * Parse a case statement.
9611 static statement_t *parse_case_statement(void)
9613 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9614 source_position_t *const pos = &statement->base.source_position;
9618 expression_t *const expression = parse_expression();
9619 statement->case_label.expression = expression;
9620 if (!is_constant_expression(expression)) {
9621 /* This check does not prevent the error message in all cases of an
9622 * prior error while parsing the expression. At least it catches the
9623 * common case of a mistyped enum entry. */
9624 if (is_type_valid(skip_typeref(expression->base.type))) {
9625 errorf(pos, "case label does not reduce to an integer constant");
9627 statement->case_label.is_bad = true;
9629 long const val = fold_constant(expression);
9630 statement->case_label.first_case = val;
9631 statement->case_label.last_case = val;
9635 if (token.type == T_DOTDOTDOT) {
9637 expression_t *const end_range = parse_expression();
9638 statement->case_label.end_range = end_range;
9639 if (!is_constant_expression(end_range)) {
9640 /* This check does not prevent the error message in all cases of an
9641 * prior error while parsing the expression. At least it catches the
9642 * common case of a mistyped enum entry. */
9643 if (is_type_valid(skip_typeref(end_range->base.type))) {
9644 errorf(pos, "case range does not reduce to an integer constant");
9646 statement->case_label.is_bad = true;
9648 long const val = fold_constant(end_range);
9649 statement->case_label.last_case = val;
9651 if (warning.other && val < statement->case_label.first_case) {
9652 statement->case_label.is_empty_range = true;
9653 warningf(pos, "empty range specified");
9659 PUSH_PARENT(statement);
9663 if (current_switch != NULL) {
9664 if (! statement->case_label.is_bad) {
9665 /* Check for duplicate case values */
9666 case_label_statement_t *c = &statement->case_label;
9667 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9668 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9671 if (c->last_case < l->first_case || c->first_case > l->last_case)
9674 errorf(pos, "duplicate case value (previously used %P)",
9675 &l->base.source_position);
9679 /* link all cases into the switch statement */
9680 if (current_switch->last_case == NULL) {
9681 current_switch->first_case = &statement->case_label;
9683 current_switch->last_case->next = &statement->case_label;
9685 current_switch->last_case = &statement->case_label;
9687 errorf(pos, "case label not within a switch statement");
9690 statement_t *const inner_stmt = parse_statement();
9691 statement->case_label.statement = inner_stmt;
9692 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9693 errorf(&inner_stmt->base.source_position, "declaration after case label");
9700 return create_invalid_statement();
9704 * Parse a default statement.
9706 static statement_t *parse_default_statement(void)
9708 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9712 PUSH_PARENT(statement);
9715 if (current_switch != NULL) {
9716 const case_label_statement_t *def_label = current_switch->default_label;
9717 if (def_label != NULL) {
9718 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9719 &def_label->base.source_position);
9721 current_switch->default_label = &statement->case_label;
9723 /* link all cases into the switch statement */
9724 if (current_switch->last_case == NULL) {
9725 current_switch->first_case = &statement->case_label;
9727 current_switch->last_case->next = &statement->case_label;
9729 current_switch->last_case = &statement->case_label;
9732 errorf(&statement->base.source_position,
9733 "'default' label not within a switch statement");
9736 statement_t *const inner_stmt = parse_statement();
9737 statement->case_label.statement = inner_stmt;
9738 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9739 errorf(&inner_stmt->base.source_position, "declaration after default label");
9746 return create_invalid_statement();
9750 * Parse a label statement.
9752 static statement_t *parse_label_statement(void)
9754 assert(token.type == T_IDENTIFIER);
9755 symbol_t *symbol = token.v.symbol;
9756 label_t *label = get_label(symbol);
9758 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9759 statement->label.label = label;
9763 PUSH_PARENT(statement);
9765 /* if statement is already set then the label is defined twice,
9766 * otherwise it was just mentioned in a goto/local label declaration so far
9768 if (label->statement != NULL) {
9769 errorf(HERE, "duplicate label '%Y' (declared %P)",
9770 symbol, &label->base.source_position);
9772 label->base.source_position = token.source_position;
9773 label->statement = statement;
9778 if (token.type == '}') {
9779 /* TODO only warn? */
9780 if (warning.other && false) {
9781 warningf(HERE, "label at end of compound statement");
9782 statement->label.statement = create_empty_statement();
9784 errorf(HERE, "label at end of compound statement");
9785 statement->label.statement = create_invalid_statement();
9787 } else if (token.type == ';') {
9788 /* Eat an empty statement here, to avoid the warning about an empty
9789 * statement after a label. label:; is commonly used to have a label
9790 * before a closing brace. */
9791 statement->label.statement = create_empty_statement();
9794 statement_t *const inner_stmt = parse_statement();
9795 statement->label.statement = inner_stmt;
9796 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9797 errorf(&inner_stmt->base.source_position, "declaration after label");
9801 /* remember the labels in a list for later checking */
9802 *label_anchor = &statement->label;
9803 label_anchor = &statement->label.next;
9810 * Parse an if statement.
9812 static statement_t *parse_if(void)
9814 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9818 PUSH_PARENT(statement);
9820 add_anchor_token('{');
9823 add_anchor_token(')');
9824 expression_t *const expr = parse_expression();
9825 statement->ifs.condition = expr;
9826 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9828 semantic_condition(expr, "condition of 'if'-statment");
9829 mark_vars_read(expr, NULL);
9830 rem_anchor_token(')');
9834 rem_anchor_token('{');
9836 add_anchor_token(T_else);
9837 statement->ifs.true_statement = parse_statement();
9838 rem_anchor_token(T_else);
9840 if (token.type == T_else) {
9842 statement->ifs.false_statement = parse_statement();
9850 * Check that all enums are handled in a switch.
9852 * @param statement the switch statement to check
9854 static void check_enum_cases(const switch_statement_t *statement) {
9855 const type_t *type = skip_typeref(statement->expression->base.type);
9856 if (! is_type_enum(type))
9858 const enum_type_t *enumt = &type->enumt;
9860 /* if we have a default, no warnings */
9861 if (statement->default_label != NULL)
9864 /* FIXME: calculation of value should be done while parsing */
9865 /* TODO: quadratic algorithm here. Change to an n log n one */
9866 long last_value = -1;
9867 const entity_t *entry = enumt->enume->base.next;
9868 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9869 entry = entry->base.next) {
9870 const expression_t *expression = entry->enum_value.value;
9871 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9873 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9874 if (l->expression == NULL)
9876 if (l->first_case <= value && value <= l->last_case) {
9882 warningf(&statement->base.source_position,
9883 "enumeration value '%Y' not handled in switch",
9884 entry->base.symbol);
9891 * Parse a switch statement.
9893 static statement_t *parse_switch(void)
9895 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9899 PUSH_PARENT(statement);
9902 add_anchor_token(')');
9903 expression_t *const expr = parse_expression();
9904 mark_vars_read(expr, NULL);
9905 type_t * type = skip_typeref(expr->base.type);
9906 if (is_type_integer(type)) {
9907 type = promote_integer(type);
9908 if (warning.traditional) {
9909 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9910 warningf(&expr->base.source_position,
9911 "'%T' switch expression not converted to '%T' in ISO C",
9915 } else if (is_type_valid(type)) {
9916 errorf(&expr->base.source_position,
9917 "switch quantity is not an integer, but '%T'", type);
9918 type = type_error_type;
9920 statement->switchs.expression = create_implicit_cast(expr, type);
9922 rem_anchor_token(')');
9924 switch_statement_t *rem = current_switch;
9925 current_switch = &statement->switchs;
9926 statement->switchs.body = parse_statement();
9927 current_switch = rem;
9929 if (warning.switch_default &&
9930 statement->switchs.default_label == NULL) {
9931 warningf(&statement->base.source_position, "switch has no default case");
9933 if (warning.switch_enum)
9934 check_enum_cases(&statement->switchs);
9940 return create_invalid_statement();
9943 static statement_t *parse_loop_body(statement_t *const loop)
9945 statement_t *const rem = current_loop;
9946 current_loop = loop;
9948 statement_t *const body = parse_statement();
9955 * Parse a while statement.
9957 static statement_t *parse_while(void)
9959 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9963 PUSH_PARENT(statement);
9966 add_anchor_token(')');
9967 expression_t *const cond = parse_expression();
9968 statement->whiles.condition = cond;
9969 /* §6.8.5:2 The controlling expression of an iteration statement shall
9970 * have scalar type. */
9971 semantic_condition(cond, "condition of 'while'-statement");
9972 mark_vars_read(cond, NULL);
9973 rem_anchor_token(')');
9976 statement->whiles.body = parse_loop_body(statement);
9982 return create_invalid_statement();
9986 * Parse a do statement.
9988 static statement_t *parse_do(void)
9990 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9994 PUSH_PARENT(statement);
9996 add_anchor_token(T_while);
9997 statement->do_while.body = parse_loop_body(statement);
9998 rem_anchor_token(T_while);
10002 add_anchor_token(')');
10003 expression_t *const cond = parse_expression();
10004 statement->do_while.condition = cond;
10005 /* §6.8.5:2 The controlling expression of an iteration statement shall
10006 * have scalar type. */
10007 semantic_condition(cond, "condition of 'do-while'-statement");
10008 mark_vars_read(cond, NULL);
10009 rem_anchor_token(')');
10017 return create_invalid_statement();
10021 * Parse a for statement.
10023 static statement_t *parse_for(void)
10025 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10029 PUSH_PARENT(statement);
10031 size_t const top = environment_top();
10032 scope_t *old_scope = scope_push(&statement->fors.scope);
10035 add_anchor_token(')');
10037 if (token.type == ';') {
10039 } else if (is_declaration_specifier(&token, false)) {
10040 parse_declaration(record_entity);
10042 add_anchor_token(';');
10043 expression_t *const init = parse_expression();
10044 statement->fors.initialisation = init;
10045 mark_vars_read(init, VAR_ANY);
10046 if (warning.unused_value && !expression_has_effect(init)) {
10047 warningf(&init->base.source_position,
10048 "initialisation of 'for'-statement has no effect");
10050 rem_anchor_token(';');
10054 if (token.type != ';') {
10055 add_anchor_token(';');
10056 expression_t *const cond = parse_expression();
10057 statement->fors.condition = cond;
10058 /* §6.8.5:2 The controlling expression of an iteration statement shall
10059 * have scalar type. */
10060 semantic_condition(cond, "condition of 'for'-statement");
10061 mark_vars_read(cond, NULL);
10062 rem_anchor_token(';');
10065 if (token.type != ')') {
10066 expression_t *const step = parse_expression();
10067 statement->fors.step = step;
10068 mark_vars_read(step, VAR_ANY);
10069 if (warning.unused_value && !expression_has_effect(step)) {
10070 warningf(&step->base.source_position,
10071 "step of 'for'-statement has no effect");
10075 rem_anchor_token(')');
10076 statement->fors.body = parse_loop_body(statement);
10078 assert(current_scope == &statement->fors.scope);
10079 scope_pop(old_scope);
10080 environment_pop_to(top);
10087 rem_anchor_token(')');
10088 assert(current_scope == &statement->fors.scope);
10089 scope_pop(old_scope);
10090 environment_pop_to(top);
10092 return create_invalid_statement();
10096 * Parse a goto statement.
10098 static statement_t *parse_goto(void)
10100 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10103 if (GNU_MODE && token.type == '*') {
10105 expression_t *expression = parse_expression();
10106 mark_vars_read(expression, NULL);
10108 /* Argh: although documentation says the expression must be of type void*,
10109 * gcc accepts anything that can be casted into void* without error */
10110 type_t *type = expression->base.type;
10112 if (type != type_error_type) {
10113 if (!is_type_pointer(type) && !is_type_integer(type)) {
10114 errorf(&expression->base.source_position,
10115 "cannot convert to a pointer type");
10116 } else if (warning.other && type != type_void_ptr) {
10117 warningf(&expression->base.source_position,
10118 "type of computed goto expression should be 'void*' not '%T'", type);
10120 expression = create_implicit_cast(expression, type_void_ptr);
10123 statement->gotos.expression = expression;
10125 if (token.type != T_IDENTIFIER) {
10127 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10129 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10130 eat_until_anchor();
10133 symbol_t *symbol = token.v.symbol;
10136 statement->gotos.label = get_label(symbol);
10139 /* remember the goto's in a list for later checking */
10140 *goto_anchor = &statement->gotos;
10141 goto_anchor = &statement->gotos.next;
10147 return create_invalid_statement();
10151 * Parse a continue statement.
10153 static statement_t *parse_continue(void)
10155 if (current_loop == NULL) {
10156 errorf(HERE, "continue statement not within loop");
10159 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10169 * Parse a break statement.
10171 static statement_t *parse_break(void)
10173 if (current_switch == NULL && current_loop == NULL) {
10174 errorf(HERE, "break statement not within loop or switch");
10177 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10187 * Parse a __leave statement.
10189 static statement_t *parse_leave_statement(void)
10191 if (current_try == NULL) {
10192 errorf(HERE, "__leave statement not within __try");
10195 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10205 * Check if a given entity represents a local variable.
10207 static bool is_local_variable(const entity_t *entity)
10209 if (entity->kind != ENTITY_VARIABLE)
10212 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10213 case STORAGE_CLASS_AUTO:
10214 case STORAGE_CLASS_REGISTER: {
10215 const type_t *type = skip_typeref(entity->declaration.type);
10216 if (is_type_function(type)) {
10228 * Check if a given expression represents a local variable.
10230 static bool expression_is_local_variable(const expression_t *expression)
10232 if (expression->base.kind != EXPR_REFERENCE) {
10235 const entity_t *entity = expression->reference.entity;
10236 return is_local_variable(entity);
10240 * Check if a given expression represents a local variable and
10241 * return its declaration then, else return NULL.
10243 entity_t *expression_is_variable(const expression_t *expression)
10245 if (expression->base.kind != EXPR_REFERENCE) {
10248 entity_t *entity = expression->reference.entity;
10249 if (entity->kind != ENTITY_VARIABLE)
10256 * Parse a return statement.
10258 static statement_t *parse_return(void)
10262 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10264 expression_t *return_value = NULL;
10265 if (token.type != ';') {
10266 return_value = parse_expression();
10267 mark_vars_read(return_value, NULL);
10270 const type_t *const func_type = skip_typeref(current_function->base.type);
10271 assert(is_type_function(func_type));
10272 type_t *const return_type = skip_typeref(func_type->function.return_type);
10274 if (return_value != NULL) {
10275 type_t *return_value_type = skip_typeref(return_value->base.type);
10277 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) &&
10278 !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10279 if (warning.other) {
10280 warningf(&statement->base.source_position,
10281 "'return' with a value, in function returning void");
10283 return_value = NULL;
10285 assign_error_t error = semantic_assign(return_type, return_value);
10286 report_assign_error(error, return_type, return_value, "'return'",
10287 &statement->base.source_position);
10288 return_value = create_implicit_cast(return_value, return_type);
10290 /* check for returning address of a local var */
10291 if (warning.other && return_value != NULL
10292 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10293 const expression_t *expression = return_value->unary.value;
10294 if (expression_is_local_variable(expression)) {
10295 warningf(&statement->base.source_position,
10296 "function returns address of local variable");
10299 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10300 warningf(&statement->base.source_position,
10301 "'return' without value, in function returning non-void");
10303 statement->returns.value = return_value;
10312 * Parse a declaration statement.
10314 static statement_t *parse_declaration_statement(void)
10316 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10318 entity_t *before = current_scope->last_entity;
10320 parse_external_declaration();
10322 parse_declaration(record_entity);
10324 if (before == NULL) {
10325 statement->declaration.declarations_begin = current_scope->entities;
10327 statement->declaration.declarations_begin = before->base.next;
10329 statement->declaration.declarations_end = current_scope->last_entity;
10335 * Parse an expression statement, ie. expr ';'.
10337 static statement_t *parse_expression_statement(void)
10339 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10341 expression_t *const expr = parse_expression();
10342 statement->expression.expression = expr;
10343 mark_vars_read(expr, VAR_ANY);
10352 * Parse a microsoft __try { } __finally { } or
10353 * __try{ } __except() { }
10355 static statement_t *parse_ms_try_statment(void)
10357 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10360 PUSH_PARENT(statement);
10362 ms_try_statement_t *rem = current_try;
10363 current_try = &statement->ms_try;
10364 statement->ms_try.try_statement = parse_compound_statement(false);
10369 if (token.type == T___except) {
10372 add_anchor_token(')');
10373 expression_t *const expr = parse_expression();
10374 mark_vars_read(expr, NULL);
10375 type_t * type = skip_typeref(expr->base.type);
10376 if (is_type_integer(type)) {
10377 type = promote_integer(type);
10378 } else if (is_type_valid(type)) {
10379 errorf(&expr->base.source_position,
10380 "__expect expression is not an integer, but '%T'", type);
10381 type = type_error_type;
10383 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10384 rem_anchor_token(')');
10386 statement->ms_try.final_statement = parse_compound_statement(false);
10387 } else if (token.type == T__finally) {
10389 statement->ms_try.final_statement = parse_compound_statement(false);
10391 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10392 return create_invalid_statement();
10396 return create_invalid_statement();
10399 static statement_t *parse_empty_statement(void)
10401 if (warning.empty_statement) {
10402 warningf(HERE, "statement is empty");
10404 statement_t *const statement = create_empty_statement();
10409 static statement_t *parse_local_label_declaration(void)
10411 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10415 entity_t *begin = NULL, *end = NULL;
10418 if (token.type != T_IDENTIFIER) {
10419 parse_error_expected("while parsing local label declaration",
10420 T_IDENTIFIER, NULL);
10423 symbol_t *symbol = token.v.symbol;
10424 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10425 if (entity != NULL && entity->base.parent_scope == current_scope) {
10426 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10427 symbol, &entity->base.source_position);
10429 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10431 entity->base.parent_scope = current_scope;
10432 entity->base.namespc = NAMESPACE_LABEL;
10433 entity->base.source_position = token.source_position;
10434 entity->base.symbol = symbol;
10437 end->base.next = entity;
10442 environment_push(entity);
10446 if (token.type != ',')
10452 statement->declaration.declarations_begin = begin;
10453 statement->declaration.declarations_end = end;
10457 static void parse_namespace_definition(void)
10461 entity_t *entity = NULL;
10462 symbol_t *symbol = NULL;
10464 if (token.type == T_IDENTIFIER) {
10465 symbol = token.v.symbol;
10468 entity = get_entity(symbol, NAMESPACE_NORMAL);
10469 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10470 && entity->base.parent_scope == current_scope) {
10471 error_redefined_as_different_kind(&token.source_position,
10472 entity, ENTITY_NAMESPACE);
10477 if (entity == NULL) {
10478 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10479 entity->base.symbol = symbol;
10480 entity->base.source_position = token.source_position;
10481 entity->base.namespc = NAMESPACE_NORMAL;
10482 entity->base.parent_scope = current_scope;
10485 if (token.type == '=') {
10486 /* TODO: parse namespace alias */
10487 panic("namespace alias definition not supported yet");
10490 environment_push(entity);
10491 append_entity(current_scope, entity);
10493 size_t const top = environment_top();
10494 scope_t *old_scope = scope_push(&entity->namespacee.members);
10501 assert(current_scope == &entity->namespacee.members);
10502 scope_pop(old_scope);
10503 environment_pop_to(top);
10507 * Parse a statement.
10508 * There's also parse_statement() which additionally checks for
10509 * "statement has no effect" warnings
10511 static statement_t *intern_parse_statement(void)
10513 statement_t *statement = NULL;
10515 /* declaration or statement */
10516 add_anchor_token(';');
10517 switch (token.type) {
10518 case T_IDENTIFIER: {
10519 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10520 if (la1_type == ':') {
10521 statement = parse_label_statement();
10522 } else if (is_typedef_symbol(token.v.symbol)) {
10523 statement = parse_declaration_statement();
10525 /* it's an identifier, the grammar says this must be an
10526 * expression statement. However it is common that users mistype
10527 * declaration types, so we guess a bit here to improve robustness
10528 * for incorrect programs */
10529 switch (la1_type) {
10532 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10533 goto expression_statment;
10538 statement = parse_declaration_statement();
10542 expression_statment:
10543 statement = parse_expression_statement();
10550 case T___extension__:
10551 /* This can be a prefix to a declaration or an expression statement.
10552 * We simply eat it now and parse the rest with tail recursion. */
10555 } while (token.type == T___extension__);
10556 bool old_gcc_extension = in_gcc_extension;
10557 in_gcc_extension = true;
10558 statement = intern_parse_statement();
10559 in_gcc_extension = old_gcc_extension;
10563 statement = parse_declaration_statement();
10567 statement = parse_local_label_declaration();
10570 case ';': statement = parse_empty_statement(); break;
10571 case '{': statement = parse_compound_statement(false); break;
10572 case T___leave: statement = parse_leave_statement(); break;
10573 case T___try: statement = parse_ms_try_statment(); break;
10574 case T_asm: statement = parse_asm_statement(); break;
10575 case T_break: statement = parse_break(); break;
10576 case T_case: statement = parse_case_statement(); break;
10577 case T_continue: statement = parse_continue(); break;
10578 case T_default: statement = parse_default_statement(); break;
10579 case T_do: statement = parse_do(); break;
10580 case T_for: statement = parse_for(); break;
10581 case T_goto: statement = parse_goto(); break;
10582 case T_if: statement = parse_if(); break;
10583 case T_return: statement = parse_return(); break;
10584 case T_switch: statement = parse_switch(); break;
10585 case T_while: statement = parse_while(); break;
10588 statement = parse_expression_statement();
10592 errorf(HERE, "unexpected token %K while parsing statement", &token);
10593 statement = create_invalid_statement();
10598 rem_anchor_token(';');
10600 assert(statement != NULL
10601 && statement->base.source_position.input_name != NULL);
10607 * parse a statement and emits "statement has no effect" warning if needed
10608 * (This is really a wrapper around intern_parse_statement with check for 1
10609 * single warning. It is needed, because for statement expressions we have
10610 * to avoid the warning on the last statement)
10612 static statement_t *parse_statement(void)
10614 statement_t *statement = intern_parse_statement();
10616 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10617 expression_t *expression = statement->expression.expression;
10618 if (!expression_has_effect(expression)) {
10619 warningf(&expression->base.source_position,
10620 "statement has no effect");
10628 * Parse a compound statement.
10630 static statement_t *parse_compound_statement(bool inside_expression_statement)
10632 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10634 PUSH_PARENT(statement);
10637 add_anchor_token('}');
10639 size_t const top = environment_top();
10640 scope_t *old_scope = scope_push(&statement->compound.scope);
10642 statement_t **anchor = &statement->compound.statements;
10643 bool only_decls_so_far = true;
10644 while (token.type != '}') {
10645 if (token.type == T_EOF) {
10646 errorf(&statement->base.source_position,
10647 "EOF while parsing compound statement");
10650 statement_t *sub_statement = intern_parse_statement();
10651 if (is_invalid_statement(sub_statement)) {
10652 /* an error occurred. if we are at an anchor, return */
10658 if (warning.declaration_after_statement) {
10659 if (sub_statement->kind != STATEMENT_DECLARATION) {
10660 only_decls_so_far = false;
10661 } else if (!only_decls_so_far) {
10662 warningf(&sub_statement->base.source_position,
10663 "ISO C90 forbids mixed declarations and code");
10667 *anchor = sub_statement;
10669 while (sub_statement->base.next != NULL)
10670 sub_statement = sub_statement->base.next;
10672 anchor = &sub_statement->base.next;
10676 /* look over all statements again to produce no effect warnings */
10677 if (warning.unused_value) {
10678 statement_t *sub_statement = statement->compound.statements;
10679 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10680 if (sub_statement->kind != STATEMENT_EXPRESSION)
10682 /* don't emit a warning for the last expression in an expression
10683 * statement as it has always an effect */
10684 if (inside_expression_statement && sub_statement->base.next == NULL)
10687 expression_t *expression = sub_statement->expression.expression;
10688 if (!expression_has_effect(expression)) {
10689 warningf(&expression->base.source_position,
10690 "statement has no effect");
10696 rem_anchor_token('}');
10697 assert(current_scope == &statement->compound.scope);
10698 scope_pop(old_scope);
10699 environment_pop_to(top);
10706 * Check for unused global static functions and variables
10708 static void check_unused_globals(void)
10710 if (!warning.unused_function && !warning.unused_variable)
10713 for (const entity_t *entity = file_scope->entities; entity != NULL;
10714 entity = entity->base.next) {
10715 if (!is_declaration(entity))
10718 const declaration_t *declaration = &entity->declaration;
10719 if (declaration->used ||
10720 declaration->modifiers & DM_UNUSED ||
10721 declaration->modifiers & DM_USED ||
10722 declaration->storage_class != STORAGE_CLASS_STATIC)
10725 type_t *const type = declaration->type;
10727 if (entity->kind == ENTITY_FUNCTION) {
10728 /* inhibit warning for static inline functions */
10729 if (entity->function.is_inline)
10732 s = entity->function.statement != NULL ? "defined" : "declared";
10737 warningf(&declaration->base.source_position, "'%#T' %s but not used",
10738 type, declaration->base.symbol, s);
10742 static void parse_global_asm(void)
10744 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10749 statement->asms.asm_text = parse_string_literals();
10750 statement->base.next = unit->global_asm;
10751 unit->global_asm = statement;
10759 static void parse_linkage_specification(void)
10762 assert(token.type == T_STRING_LITERAL);
10764 const char *linkage = parse_string_literals().begin;
10766 linkage_kind_t old_linkage = current_linkage;
10767 linkage_kind_t new_linkage;
10768 if (strcmp(linkage, "C") == 0) {
10769 new_linkage = LINKAGE_C;
10770 } else if (strcmp(linkage, "C++") == 0) {
10771 new_linkage = LINKAGE_CXX;
10773 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
10774 new_linkage = LINKAGE_INVALID;
10776 current_linkage = new_linkage;
10778 if (token.type == '{') {
10787 assert(current_linkage == new_linkage);
10788 current_linkage = old_linkage;
10791 static void parse_external(void)
10793 switch (token.type) {
10794 DECLARATION_START_NO_EXTERN
10796 case T___extension__:
10797 case '(': /* for function declarations with implicit return type and
10798 * parenthesized declarator, i.e. (f)(void); */
10799 parse_external_declaration();
10803 if (look_ahead(1)->type == T_STRING_LITERAL) {
10804 parse_linkage_specification();
10806 parse_external_declaration();
10811 parse_global_asm();
10815 parse_namespace_definition();
10819 if (!strict_mode) {
10821 warningf(HERE, "stray ';' outside of function");
10828 errorf(HERE, "stray %K outside of function", &token);
10829 if (token.type == '(' || token.type == '{' || token.type == '[')
10830 eat_until_matching_token(token.type);
10836 static void parse_externals(void)
10838 add_anchor_token('}');
10839 add_anchor_token(T_EOF);
10842 unsigned char token_anchor_copy[T_LAST_TOKEN];
10843 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10846 while (token.type != T_EOF && token.type != '}') {
10848 bool anchor_leak = false;
10849 for (int i = 0; i != T_LAST_TOKEN; ++i) {
10850 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10852 errorf(HERE, "Leaked anchor token %k %d times", i, count);
10853 anchor_leak = true;
10856 if (in_gcc_extension) {
10857 errorf(HERE, "Leaked __extension__");
10858 anchor_leak = true;
10868 rem_anchor_token(T_EOF);
10869 rem_anchor_token('}');
10873 * Parse a translation unit.
10875 static void parse_translation_unit(void)
10877 add_anchor_token(T_EOF);
10882 if (token.type == T_EOF)
10885 errorf(HERE, "stray %K outside of function", &token);
10886 if (token.type == '(' || token.type == '{' || token.type == '[')
10887 eat_until_matching_token(token.type);
10895 * @return the translation unit or NULL if errors occurred.
10897 void start_parsing(void)
10899 environment_stack = NEW_ARR_F(stack_entry_t, 0);
10900 label_stack = NEW_ARR_F(stack_entry_t, 0);
10901 diagnostic_count = 0;
10905 type_set_output(stderr);
10906 ast_set_output(stderr);
10908 assert(unit == NULL);
10909 unit = allocate_ast_zero(sizeof(unit[0]));
10911 assert(file_scope == NULL);
10912 file_scope = &unit->scope;
10914 assert(current_scope == NULL);
10915 scope_push(&unit->scope);
10918 translation_unit_t *finish_parsing(void)
10920 assert(current_scope == &unit->scope);
10923 assert(file_scope == &unit->scope);
10924 check_unused_globals();
10927 DEL_ARR_F(environment_stack);
10928 DEL_ARR_F(label_stack);
10930 translation_unit_t *result = unit;
10937 lookahead_bufpos = 0;
10938 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10941 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
10942 parse_translation_unit();
10946 * Initialize the parser.
10948 void init_parser(void)
10950 sym_anonymous = symbol_table_insert("<anonymous>");
10952 if (c_mode & _MS) {
10953 /* add predefined symbols for extended-decl-modifier */
10954 sym_align = symbol_table_insert("align");
10955 sym_allocate = symbol_table_insert("allocate");
10956 sym_dllimport = symbol_table_insert("dllimport");
10957 sym_dllexport = symbol_table_insert("dllexport");
10958 sym_naked = symbol_table_insert("naked");
10959 sym_noinline = symbol_table_insert("noinline");
10960 sym_noreturn = symbol_table_insert("noreturn");
10961 sym_nothrow = symbol_table_insert("nothrow");
10962 sym_novtable = symbol_table_insert("novtable");
10963 sym_property = symbol_table_insert("property");
10964 sym_get = symbol_table_insert("get");
10965 sym_put = symbol_table_insert("put");
10966 sym_selectany = symbol_table_insert("selectany");
10967 sym_thread = symbol_table_insert("thread");
10968 sym_uuid = symbol_table_insert("uuid");
10969 sym_deprecated = symbol_table_insert("deprecated");
10970 sym_restrict = symbol_table_insert("restrict");
10971 sym_noalias = symbol_table_insert("noalias");
10973 memset(token_anchor_set, 0, sizeof(token_anchor_set));
10975 init_expression_parsers();
10976 obstack_init(&temp_obst);
10978 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
10979 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
10983 * Terminate the parser.
10985 void exit_parser(void)
10987 obstack_free(&temp_obst, NULL);