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_PARAMETER] = sizeof(parameter_t),
335 [ENTITY_COMPOUND_MEMBER] = sizeof(compound_member_t),
336 [ENTITY_FUNCTION] = sizeof(function_t),
337 [ENTITY_TYPEDEF] = sizeof(typedef_t),
338 [ENTITY_STRUCT] = sizeof(compound_t),
339 [ENTITY_UNION] = sizeof(compound_t),
340 [ENTITY_ENUM] = sizeof(enum_t),
341 [ENTITY_ENUM_VALUE] = sizeof(enum_value_t),
342 [ENTITY_LABEL] = sizeof(label_t),
343 [ENTITY_LOCAL_LABEL] = sizeof(label_t),
344 [ENTITY_NAMESPACE] = sizeof(namespace_t)
346 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
347 assert(sizes[kind] != 0);
351 static entity_t *allocate_entity_zero(entity_kind_t kind)
353 size_t size = get_entity_struct_size(kind);
354 entity_t *entity = allocate_ast_zero(size);
360 * Returns the size of a statement node.
362 * @param kind the statement kind
364 static size_t get_statement_struct_size(statement_kind_t kind)
366 static const size_t sizes[] = {
367 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
368 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
369 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
370 [STATEMENT_RETURN] = sizeof(return_statement_t),
371 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
372 [STATEMENT_LOCAL_LABEL] = sizeof(local_label_statement_t),
373 [STATEMENT_IF] = sizeof(if_statement_t),
374 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
375 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
376 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
377 [STATEMENT_BREAK] = sizeof(statement_base_t),
378 [STATEMENT_GOTO] = sizeof(goto_statement_t),
379 [STATEMENT_LABEL] = sizeof(label_statement_t),
380 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
381 [STATEMENT_WHILE] = sizeof(while_statement_t),
382 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
383 [STATEMENT_FOR] = sizeof(for_statement_t),
384 [STATEMENT_ASM] = sizeof(asm_statement_t),
385 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
386 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
388 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
389 assert(sizes[kind] != 0);
394 * Returns the size of an expression node.
396 * @param kind the expression kind
398 static size_t get_expression_struct_size(expression_kind_t kind)
400 static const size_t sizes[] = {
401 [EXPR_INVALID] = sizeof(expression_base_t),
402 [EXPR_REFERENCE] = sizeof(reference_expression_t),
403 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
404 [EXPR_CONST] = sizeof(const_expression_t),
405 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
406 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
407 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
408 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
409 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
410 [EXPR_CALL] = sizeof(call_expression_t),
411 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
412 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
413 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
414 [EXPR_SELECT] = sizeof(select_expression_t),
415 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
416 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
417 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
418 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
419 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
420 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
421 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
422 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
423 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
424 [EXPR_VA_START] = sizeof(va_start_expression_t),
425 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
426 [EXPR_STATEMENT] = sizeof(statement_expression_t),
427 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
429 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
430 return sizes[EXPR_UNARY_FIRST];
432 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
433 return sizes[EXPR_BINARY_FIRST];
435 assert(kind < sizeof(sizes) / sizeof(sizes[0]));
436 assert(sizes[kind] != 0);
441 * Allocate a statement node of given kind and initialize all
444 static statement_t *allocate_statement_zero(statement_kind_t kind)
446 size_t size = get_statement_struct_size(kind);
447 statement_t *res = allocate_ast_zero(size);
449 res->base.kind = kind;
450 res->base.parent = current_parent;
451 res->base.source_position = token.source_position;
456 * Allocate an expression node of given kind and initialize all
459 static expression_t *allocate_expression_zero(expression_kind_t kind)
461 size_t size = get_expression_struct_size(kind);
462 expression_t *res = allocate_ast_zero(size);
464 res->base.kind = kind;
465 res->base.type = type_error_type;
466 res->base.source_position = token.source_position;
471 * Creates a new invalid expression.
473 static expression_t *create_invalid_expression(void)
475 return allocate_expression_zero(EXPR_INVALID);
479 * Creates a new invalid statement.
481 static statement_t *create_invalid_statement(void)
483 return allocate_statement_zero(STATEMENT_INVALID);
487 * Allocate a new empty statement.
489 static statement_t *create_empty_statement(void)
491 return allocate_statement_zero(STATEMENT_EMPTY);
495 * Returns the size of a type node.
497 * @param kind the type kind
499 static size_t get_type_struct_size(type_kind_t kind)
501 static const size_t sizes[] = {
502 [TYPE_ATOMIC] = sizeof(atomic_type_t),
503 [TYPE_COMPLEX] = sizeof(complex_type_t),
504 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
505 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
506 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
507 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
508 [TYPE_ENUM] = sizeof(enum_type_t),
509 [TYPE_FUNCTION] = sizeof(function_type_t),
510 [TYPE_POINTER] = sizeof(pointer_type_t),
511 [TYPE_ARRAY] = sizeof(array_type_t),
512 [TYPE_BUILTIN] = sizeof(builtin_type_t),
513 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
514 [TYPE_TYPEOF] = sizeof(typeof_type_t),
516 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
517 assert(kind <= TYPE_TYPEOF);
518 assert(sizes[kind] != 0);
523 * Allocate a type node of given kind and initialize all
526 * @param kind type kind to allocate
528 static type_t *allocate_type_zero(type_kind_t kind)
530 size_t size = get_type_struct_size(kind);
531 type_t *res = obstack_alloc(type_obst, size);
532 memset(res, 0, size);
533 res->base.kind = kind;
539 * Returns the size of an initializer node.
541 * @param kind the initializer kind
543 static size_t get_initializer_size(initializer_kind_t kind)
545 static const size_t sizes[] = {
546 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
547 [INITIALIZER_STRING] = sizeof(initializer_string_t),
548 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
549 [INITIALIZER_LIST] = sizeof(initializer_list_t),
550 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
552 assert(kind < sizeof(sizes) / sizeof(*sizes));
553 assert(sizes[kind] != 0);
558 * Allocate an initializer node of given kind and initialize all
561 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
563 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
570 * Free a type from the type obstack.
572 static void free_type(void *type)
574 obstack_free(type_obst, type);
578 * Returns the index of the top element of the environment stack.
580 static size_t environment_top(void)
582 return ARR_LEN(environment_stack);
586 * Returns the index of the top element of the global label stack.
588 static size_t label_top(void)
590 return ARR_LEN(label_stack);
594 * Return the next token.
596 static inline void next_token(void)
598 token = lookahead_buffer[lookahead_bufpos];
599 lookahead_buffer[lookahead_bufpos] = lexer_token;
602 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
605 print_token(stderr, &token);
606 fprintf(stderr, "\n");
611 * Return the next token with a given lookahead.
613 static inline const token_t *look_ahead(int num)
615 assert(num > 0 && num <= MAX_LOOKAHEAD);
616 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
617 return &lookahead_buffer[pos];
621 * Adds a token to the token anchor set (a multi-set).
623 static void add_anchor_token(int token_type)
625 assert(0 <= token_type && token_type < T_LAST_TOKEN);
626 ++token_anchor_set[token_type];
629 static int save_and_reset_anchor_state(int token_type)
631 assert(0 <= token_type && token_type < T_LAST_TOKEN);
632 int count = token_anchor_set[token_type];
633 token_anchor_set[token_type] = 0;
637 static void restore_anchor_state(int token_type, int count)
639 assert(0 <= token_type && token_type < T_LAST_TOKEN);
640 token_anchor_set[token_type] = count;
644 * Remove a token from the token anchor set (a multi-set).
646 static void rem_anchor_token(int token_type)
648 assert(0 <= token_type && token_type < T_LAST_TOKEN);
649 assert(token_anchor_set[token_type] != 0);
650 --token_anchor_set[token_type];
653 static bool at_anchor(void)
657 return token_anchor_set[token.type];
661 * Eat tokens until a matching token is found.
663 static void eat_until_matching_token(int type)
667 case '(': end_token = ')'; break;
668 case '{': end_token = '}'; break;
669 case '[': end_token = ']'; break;
670 default: end_token = type; break;
673 unsigned parenthesis_count = 0;
674 unsigned brace_count = 0;
675 unsigned bracket_count = 0;
676 while (token.type != end_token ||
677 parenthesis_count != 0 ||
679 bracket_count != 0) {
680 switch (token.type) {
682 case '(': ++parenthesis_count; break;
683 case '{': ++brace_count; break;
684 case '[': ++bracket_count; break;
687 if (parenthesis_count > 0)
697 if (bracket_count > 0)
700 if (token.type == end_token &&
701 parenthesis_count == 0 &&
715 * Eat input tokens until an anchor is found.
717 static void eat_until_anchor(void)
719 while (token_anchor_set[token.type] == 0) {
720 if (token.type == '(' || token.type == '{' || token.type == '[')
721 eat_until_matching_token(token.type);
726 static void eat_block(void)
728 eat_until_matching_token('{');
729 if (token.type == '}')
733 #define eat(token_type) do { assert(token.type == (token_type)); next_token(); } while (0)
736 * Report a parse error because an expected token was not found.
739 #if defined __GNUC__ && __GNUC__ >= 4
740 __attribute__((sentinel))
742 void parse_error_expected(const char *message, ...)
744 if (message != NULL) {
745 errorf(HERE, "%s", message);
748 va_start(ap, message);
749 errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
754 * Report an incompatible type.
756 static void type_error_incompatible(const char *msg,
757 const source_position_t *source_position, type_t *type1, type_t *type2)
759 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
764 * Expect the the current token is the expected token.
765 * If not, generate an error, eat the current statement,
766 * and goto the end_error label.
768 #define expect(expected) \
770 if (UNLIKELY(token.type != (expected))) { \
771 parse_error_expected(NULL, (expected), NULL); \
772 add_anchor_token(expected); \
773 eat_until_anchor(); \
774 if (token.type == expected) \
776 rem_anchor_token(expected); \
782 static scope_t *scope_push(scope_t *new_scope)
784 if (current_scope != NULL) {
785 new_scope->depth = current_scope->depth + 1;
788 scope_t *old_scope = current_scope;
789 current_scope = new_scope;
793 static void scope_pop(scope_t *old_scope)
795 current_scope = old_scope;
799 * Search an entity by its symbol in a given namespace.
801 static entity_t *get_entity(const symbol_t *const symbol,
802 namespace_tag_t namespc)
804 entity_t *entity = symbol->entity;
805 for (; entity != NULL; entity = entity->base.symbol_next) {
806 if (entity->base.namespc == namespc)
814 * pushs an entity on the environment stack and links the corresponding symbol
817 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
819 symbol_t *symbol = entity->base.symbol;
820 entity_namespace_t namespc = entity->base.namespc;
821 assert(namespc != NAMESPACE_INVALID);
823 /* replace/add entity into entity list of the symbol */
826 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
831 /* replace an entry? */
832 if (iter->base.namespc == namespc) {
833 entity->base.symbol_next = iter->base.symbol_next;
839 /* remember old declaration */
841 entry.symbol = symbol;
842 entry.old_entity = iter;
843 entry.namespc = namespc;
844 ARR_APP1(stack_entry_t, *stack_ptr, entry);
848 * Push an entity on the environment stack.
850 static void environment_push(entity_t *entity)
852 assert(entity->base.source_position.input_name != NULL);
853 assert(entity->base.parent_scope != NULL);
854 stack_push(&environment_stack, entity);
858 * Push a declaration on the global label stack.
860 * @param declaration the declaration
862 static void label_push(entity_t *label)
864 /* we abuse the parameters scope as parent for the labels */
865 label->base.parent_scope = ¤t_function->parameters;
866 stack_push(&label_stack, label);
870 * pops symbols from the environment stack until @p new_top is the top element
872 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
874 stack_entry_t *stack = *stack_ptr;
875 size_t top = ARR_LEN(stack);
878 assert(new_top <= top);
882 for (i = top; i > new_top; --i) {
883 stack_entry_t *entry = &stack[i - 1];
885 entity_t *old_entity = entry->old_entity;
886 symbol_t *symbol = entry->symbol;
887 entity_namespace_t namespc = entry->namespc;
889 /* replace with old_entity/remove */
892 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
894 assert(iter != NULL);
895 /* replace an entry? */
896 if (iter->base.namespc == namespc)
900 /* restore definition from outer scopes (if there was one) */
901 if (old_entity != NULL) {
902 old_entity->base.symbol_next = iter->base.symbol_next;
903 *anchor = old_entity;
905 /* remove entry from list */
906 *anchor = iter->base.symbol_next;
910 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
914 * Pop all entries from the environment stack until the new_top
917 * @param new_top the new stack top
919 static void environment_pop_to(size_t new_top)
921 stack_pop_to(&environment_stack, new_top);
925 * Pop all entries from the global label stack until the new_top
928 * @param new_top the new stack top
930 static void label_pop_to(size_t new_top)
932 stack_pop_to(&label_stack, new_top);
935 static int get_akind_rank(atomic_type_kind_t akind)
940 static int get_rank(const type_t *type)
942 assert(!is_typeref(type));
943 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
944 * and esp. footnote 108). However we can't fold constants (yet), so we
945 * can't decide whether unsigned int is possible, while int always works.
946 * (unsigned int would be preferable when possible... for stuff like
947 * struct { enum { ... } bla : 4; } ) */
948 if (type->kind == TYPE_ENUM)
949 return get_akind_rank(ATOMIC_TYPE_INT);
951 assert(type->kind == TYPE_ATOMIC);
952 return get_akind_rank(type->atomic.akind);
955 static type_t *promote_integer(type_t *type)
957 if (type->kind == TYPE_BITFIELD)
958 type = type->bitfield.base_type;
960 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
967 * Create a cast expression.
969 * @param expression the expression to cast
970 * @param dest_type the destination type
972 static expression_t *create_cast_expression(expression_t *expression,
975 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
977 cast->unary.value = expression;
978 cast->base.type = dest_type;
984 * Check if a given expression represents the 0 pointer constant.
986 static bool is_null_pointer_constant(const expression_t *expression)
988 /* skip void* cast */
989 if (expression->kind == EXPR_UNARY_CAST
990 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
991 expression = expression->unary.value;
994 /* TODO: not correct yet, should be any constant integer expression
995 * which evaluates to 0 */
996 if (expression->kind != EXPR_CONST)
999 type_t *const type = skip_typeref(expression->base.type);
1000 if (!is_type_integer(type))
1003 return expression->conste.v.int_value == 0;
1007 * Create an implicit cast expression.
1009 * @param expression the expression to cast
1010 * @param dest_type the destination type
1012 static expression_t *create_implicit_cast(expression_t *expression,
1015 type_t *const source_type = expression->base.type;
1017 if (source_type == dest_type)
1020 return create_cast_expression(expression, dest_type);
1023 typedef enum assign_error_t {
1025 ASSIGN_ERROR_INCOMPATIBLE,
1026 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1027 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1028 ASSIGN_WARNING_POINTER_FROM_INT,
1029 ASSIGN_WARNING_INT_FROM_POINTER
1032 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1033 const expression_t *const right,
1034 const char *context,
1035 const source_position_t *source_position)
1037 type_t *const orig_type_right = right->base.type;
1038 type_t *const type_left = skip_typeref(orig_type_left);
1039 type_t *const type_right = skip_typeref(orig_type_right);
1042 case ASSIGN_SUCCESS:
1044 case ASSIGN_ERROR_INCOMPATIBLE:
1045 errorf(source_position,
1046 "destination type '%T' in %s is incompatible with type '%T'",
1047 orig_type_left, context, orig_type_right);
1050 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1051 if (warning.other) {
1052 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
1053 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1055 /* the left type has all qualifiers from the right type */
1056 unsigned missing_qualifiers
1057 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1058 warningf(source_position,
1059 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1060 orig_type_left, context, orig_type_right, missing_qualifiers);
1065 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1066 if (warning.other) {
1067 warningf(source_position,
1068 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1069 orig_type_left, context, right, orig_type_right);
1073 case ASSIGN_WARNING_POINTER_FROM_INT:
1074 if (warning.other) {
1075 warningf(source_position,
1076 "%s makes pointer '%T' from integer '%T' without a cast",
1077 context, orig_type_left, orig_type_right);
1081 case ASSIGN_WARNING_INT_FROM_POINTER:
1082 if (warning.other) {
1083 warningf(source_position,
1084 "%s makes integer '%T' from pointer '%T' without a cast",
1085 context, orig_type_left, orig_type_right);
1090 panic("invalid error value");
1094 /** Implements the rules from § 6.5.16.1 */
1095 static assign_error_t semantic_assign(type_t *orig_type_left,
1096 const expression_t *const right)
1098 type_t *const orig_type_right = right->base.type;
1099 type_t *const type_left = skip_typeref(orig_type_left);
1100 type_t *const type_right = skip_typeref(orig_type_right);
1102 if (is_type_pointer(type_left)) {
1103 if (is_null_pointer_constant(right)) {
1104 return ASSIGN_SUCCESS;
1105 } else if (is_type_pointer(type_right)) {
1106 type_t *points_to_left
1107 = skip_typeref(type_left->pointer.points_to);
1108 type_t *points_to_right
1109 = skip_typeref(type_right->pointer.points_to);
1110 assign_error_t res = ASSIGN_SUCCESS;
1112 /* the left type has all qualifiers from the right type */
1113 unsigned missing_qualifiers
1114 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1115 if (missing_qualifiers != 0) {
1116 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1119 points_to_left = get_unqualified_type(points_to_left);
1120 points_to_right = get_unqualified_type(points_to_right);
1122 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1125 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1126 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1127 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1130 if (!types_compatible(points_to_left, points_to_right)) {
1131 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1135 } else if (is_type_integer(type_right)) {
1136 return ASSIGN_WARNING_POINTER_FROM_INT;
1138 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1139 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1140 && is_type_pointer(type_right))) {
1141 return ASSIGN_SUCCESS;
1142 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1143 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1144 type_t *const unqual_type_left = get_unqualified_type(type_left);
1145 type_t *const unqual_type_right = get_unqualified_type(type_right);
1146 if (types_compatible(unqual_type_left, unqual_type_right)) {
1147 return ASSIGN_SUCCESS;
1149 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1150 return ASSIGN_WARNING_INT_FROM_POINTER;
1153 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1154 return ASSIGN_SUCCESS;
1156 return ASSIGN_ERROR_INCOMPATIBLE;
1159 static expression_t *parse_constant_expression(void)
1161 expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1163 if (!is_constant_expression(result)) {
1164 errorf(&result->base.source_position,
1165 "expression '%E' is not constant", result);
1171 static expression_t *parse_assignment_expression(void)
1173 return parse_sub_expression(PREC_ASSIGNMENT);
1176 static string_t parse_string_literals(void)
1178 assert(token.type == T_STRING_LITERAL);
1179 string_t result = token.v.string;
1183 while (token.type == T_STRING_LITERAL) {
1184 result = concat_strings(&result, &token.v.string);
1191 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1192 [GNU_AK_CONST] = "const",
1193 [GNU_AK_VOLATILE] = "volatile",
1194 [GNU_AK_CDECL] = "cdecl",
1195 [GNU_AK_STDCALL] = "stdcall",
1196 [GNU_AK_FASTCALL] = "fastcall",
1197 [GNU_AK_DEPRECATED] = "deprecated",
1198 [GNU_AK_NOINLINE] = "noinline",
1199 [GNU_AK_NORETURN] = "noreturn",
1200 [GNU_AK_NAKED] = "naked",
1201 [GNU_AK_PURE] = "pure",
1202 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1203 [GNU_AK_MALLOC] = "malloc",
1204 [GNU_AK_WEAK] = "weak",
1205 [GNU_AK_CONSTRUCTOR] = "constructor",
1206 [GNU_AK_DESTRUCTOR] = "destructor",
1207 [GNU_AK_NOTHROW] = "nothrow",
1208 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1209 [GNU_AK_COMMON] = "common",
1210 [GNU_AK_NOCOMMON] = "nocommon",
1211 [GNU_AK_PACKED] = "packed",
1212 [GNU_AK_SHARED] = "shared",
1213 [GNU_AK_NOTSHARED] = "notshared",
1214 [GNU_AK_USED] = "used",
1215 [GNU_AK_UNUSED] = "unused",
1216 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1217 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1218 [GNU_AK_LONGCALL] = "longcall",
1219 [GNU_AK_SHORTCALL] = "shortcall",
1220 [GNU_AK_LONG_CALL] = "long_call",
1221 [GNU_AK_SHORT_CALL] = "short_call",
1222 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1223 [GNU_AK_INTERRUPT] = "interrupt",
1224 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1225 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1226 [GNU_AK_NESTING] = "nesting",
1227 [GNU_AK_NEAR] = "near",
1228 [GNU_AK_FAR] = "far",
1229 [GNU_AK_SIGNAL] = "signal",
1230 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1231 [GNU_AK_TINY_DATA] = "tiny_data",
1232 [GNU_AK_SAVEALL] = "saveall",
1233 [GNU_AK_FLATTEN] = "flatten",
1234 [GNU_AK_SSEREGPARM] = "sseregparm",
1235 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1236 [GNU_AK_RETURN_TWICE] = "return_twice",
1237 [GNU_AK_MAY_ALIAS] = "may_alias",
1238 [GNU_AK_MS_STRUCT] = "ms_struct",
1239 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1240 [GNU_AK_DLLIMPORT] = "dllimport",
1241 [GNU_AK_DLLEXPORT] = "dllexport",
1242 [GNU_AK_ALIGNED] = "aligned",
1243 [GNU_AK_ALIAS] = "alias",
1244 [GNU_AK_SECTION] = "section",
1245 [GNU_AK_FORMAT] = "format",
1246 [GNU_AK_FORMAT_ARG] = "format_arg",
1247 [GNU_AK_WEAKREF] = "weakref",
1248 [GNU_AK_NONNULL] = "nonnull",
1249 [GNU_AK_TLS_MODEL] = "tls_model",
1250 [GNU_AK_VISIBILITY] = "visibility",
1251 [GNU_AK_REGPARM] = "regparm",
1252 [GNU_AK_MODE] = "mode",
1253 [GNU_AK_MODEL] = "model",
1254 [GNU_AK_TRAP_EXIT] = "trap_exit",
1255 [GNU_AK_SP_SWITCH] = "sp_switch",
1256 [GNU_AK_SENTINEL] = "sentinel"
1260 * compare two string, ignoring double underscores on the second.
1262 static int strcmp_underscore(const char *s1, const char *s2)
1264 if (s2[0] == '_' && s2[1] == '_') {
1265 size_t len2 = strlen(s2);
1266 size_t len1 = strlen(s1);
1267 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1268 return strncmp(s1, s2+2, len2-4);
1272 return strcmp(s1, s2);
1276 * Allocate a new gnu temporal attribute.
1278 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1280 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1281 attribute->kind = kind;
1282 attribute->next = NULL;
1283 attribute->invalid = false;
1284 attribute->have_arguments = false;
1290 * parse one constant expression argument.
1292 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1294 expression_t *expression;
1295 add_anchor_token(')');
1296 expression = parse_constant_expression();
1297 rem_anchor_token(')');
1299 attribute->u.argument = fold_constant(expression);
1302 attribute->invalid = true;
1306 * parse a list of constant expressions arguments.
1308 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1310 argument_list_t **list = &attribute->u.arguments;
1311 argument_list_t *entry;
1312 expression_t *expression;
1313 add_anchor_token(')');
1314 add_anchor_token(',');
1316 expression = parse_constant_expression();
1317 entry = obstack_alloc(&temp_obst, sizeof(entry));
1318 entry->argument = fold_constant(expression);
1321 list = &entry->next;
1322 if (token.type != ',')
1326 rem_anchor_token(',');
1327 rem_anchor_token(')');
1331 attribute->invalid = true;
1335 * parse one string literal argument.
1337 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1340 add_anchor_token('(');
1341 if (token.type != T_STRING_LITERAL) {
1342 parse_error_expected("while parsing attribute directive",
1343 T_STRING_LITERAL, NULL);
1346 *string = parse_string_literals();
1347 rem_anchor_token('(');
1351 attribute->invalid = true;
1355 * parse one tls model.
1357 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1359 static const char *const tls_models[] = {
1365 string_t string = { NULL, 0 };
1366 parse_gnu_attribute_string_arg(attribute, &string);
1367 if (string.begin != NULL) {
1368 for (size_t i = 0; i < 4; ++i) {
1369 if (strcmp(tls_models[i], string.begin) == 0) {
1370 attribute->u.value = i;
1374 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1376 attribute->invalid = true;
1380 * parse one tls model.
1382 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1384 static const char *const visibilities[] = {
1390 string_t string = { NULL, 0 };
1391 parse_gnu_attribute_string_arg(attribute, &string);
1392 if (string.begin != NULL) {
1393 for (size_t i = 0; i < 4; ++i) {
1394 if (strcmp(visibilities[i], string.begin) == 0) {
1395 attribute->u.value = i;
1399 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1401 attribute->invalid = true;
1405 * parse one (code) model.
1407 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1409 static const char *const visibilities[] = {
1414 string_t string = { NULL, 0 };
1415 parse_gnu_attribute_string_arg(attribute, &string);
1416 if (string.begin != NULL) {
1417 for (int i = 0; i < 3; ++i) {
1418 if (strcmp(visibilities[i], string.begin) == 0) {
1419 attribute->u.value = i;
1423 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1425 attribute->invalid = true;
1428 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1430 /* TODO: find out what is allowed here... */
1432 /* at least: byte, word, pointer, list of machine modes
1433 * __XXX___ is interpreted as XXX */
1434 add_anchor_token(')');
1436 if (token.type != T_IDENTIFIER) {
1437 expect(T_IDENTIFIER);
1440 /* This isn't really correct, the backend should provide a list of machine
1441 * specific modes (according to gcc philosophy that is...) */
1442 const char *symbol_str = token.v.symbol->string;
1443 if (strcmp_underscore("QI", symbol_str) == 0 ||
1444 strcmp_underscore("byte", symbol_str) == 0) {
1445 attribute->u.akind = ATOMIC_TYPE_CHAR;
1446 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1447 attribute->u.akind = ATOMIC_TYPE_SHORT;
1448 } else if (strcmp_underscore("SI", symbol_str) == 0
1449 || strcmp_underscore("word", symbol_str) == 0
1450 || strcmp_underscore("pointer", symbol_str) == 0) {
1451 attribute->u.akind = ATOMIC_TYPE_INT;
1452 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1453 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1456 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1457 attribute->invalid = true;
1461 rem_anchor_token(')');
1465 attribute->invalid = true;
1469 * parse one interrupt argument.
1471 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1473 static const char *const interrupts[] = {
1480 string_t string = { NULL, 0 };
1481 parse_gnu_attribute_string_arg(attribute, &string);
1482 if (string.begin != NULL) {
1483 for (size_t i = 0; i < 5; ++i) {
1484 if (strcmp(interrupts[i], string.begin) == 0) {
1485 attribute->u.value = i;
1489 errorf(HERE, "'%s' is not an interrupt", string.begin);
1491 attribute->invalid = true;
1495 * parse ( identifier, const expression, const expression )
1497 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1499 static const char *const format_names[] = {
1507 if (token.type != T_IDENTIFIER) {
1508 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1511 const char *name = token.v.symbol->string;
1512 for (i = 0; i < 4; ++i) {
1513 if (strcmp_underscore(format_names[i], name) == 0)
1517 if (warning.attribute)
1518 warningf(HERE, "'%s' is an unrecognized format function type", name);
1523 add_anchor_token(')');
1524 add_anchor_token(',');
1525 parse_constant_expression();
1526 rem_anchor_token(',');
1527 rem_anchor_token(')');
1530 add_anchor_token(')');
1531 parse_constant_expression();
1532 rem_anchor_token(')');
1536 attribute->u.value = true;
1539 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1541 if (!attribute->have_arguments)
1544 /* should have no arguments */
1545 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1546 eat_until_matching_token('(');
1547 /* we have already consumed '(', so we stop before ')', eat it */
1549 attribute->invalid = true;
1553 * Parse one GNU attribute.
1555 * Note that attribute names can be specified WITH or WITHOUT
1556 * double underscores, ie const or __const__.
1558 * The following attributes are parsed without arguments
1583 * no_instrument_function
1584 * warn_unused_result
1601 * externally_visible
1609 * The following attributes are parsed with arguments
1610 * aligned( const expression )
1611 * alias( string literal )
1612 * section( string literal )
1613 * format( identifier, const expression, const expression )
1614 * format_arg( const expression )
1615 * tls_model( string literal )
1616 * visibility( string literal )
1617 * regparm( const expression )
1618 * model( string leteral )
1619 * trap_exit( const expression )
1620 * sp_switch( string literal )
1622 * The following attributes might have arguments
1623 * weak_ref( string literal )
1624 * non_null( const expression // ',' )
1625 * interrupt( string literal )
1626 * sentinel( constant expression )
1628 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1630 gnu_attribute_t *head = *attributes;
1631 gnu_attribute_t *last = *attributes;
1632 decl_modifiers_t modifiers = 0;
1633 gnu_attribute_t *attribute;
1635 eat(T___attribute__);
1639 if (token.type != ')') {
1640 /* find the end of the list */
1642 while (last->next != NULL)
1646 /* non-empty attribute list */
1649 if (token.type == T_const) {
1651 } else if (token.type == T_volatile) {
1653 } else if (token.type == T_cdecl) {
1654 /* __attribute__((cdecl)), WITH ms mode */
1656 } else if (token.type == T_IDENTIFIER) {
1657 const symbol_t *sym = token.v.symbol;
1660 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1667 for (i = 0; i < GNU_AK_LAST; ++i) {
1668 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1671 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1674 if (kind == GNU_AK_LAST) {
1675 if (warning.attribute)
1676 warningf(HERE, "'%s' attribute directive ignored", name);
1678 /* skip possible arguments */
1679 if (token.type == '(') {
1680 eat_until_matching_token(')');
1683 /* check for arguments */
1684 attribute = allocate_gnu_attribute(kind);
1685 if (token.type == '(') {
1687 if (token.type == ')') {
1688 /* empty args are allowed */
1691 attribute->have_arguments = true;
1695 case GNU_AK_VOLATILE:
1700 case GNU_AK_NOCOMMON:
1702 case GNU_AK_NOTSHARED:
1703 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1704 case GNU_AK_WARN_UNUSED_RESULT:
1705 case GNU_AK_LONGCALL:
1706 case GNU_AK_SHORTCALL:
1707 case GNU_AK_LONG_CALL:
1708 case GNU_AK_SHORT_CALL:
1709 case GNU_AK_FUNCTION_VECTOR:
1710 case GNU_AK_INTERRUPT_HANDLER:
1711 case GNU_AK_NMI_HANDLER:
1712 case GNU_AK_NESTING:
1716 case GNU_AK_EIGTHBIT_DATA:
1717 case GNU_AK_TINY_DATA:
1718 case GNU_AK_SAVEALL:
1719 case GNU_AK_FLATTEN:
1720 case GNU_AK_SSEREGPARM:
1721 case GNU_AK_EXTERNALLY_VISIBLE:
1722 case GNU_AK_RETURN_TWICE:
1723 case GNU_AK_MAY_ALIAS:
1724 case GNU_AK_MS_STRUCT:
1725 case GNU_AK_GCC_STRUCT:
1728 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1729 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1730 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1731 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1732 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1733 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1734 case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg;
1735 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1736 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1737 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1738 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1739 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1740 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1741 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1742 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1743 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1744 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1745 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1747 case GNU_AK_ALIGNED:
1748 /* __align__ may be used without an argument */
1749 if (attribute->have_arguments) {
1750 parse_gnu_attribute_const_arg(attribute);
1754 case GNU_AK_FORMAT_ARG:
1755 case GNU_AK_REGPARM:
1756 case GNU_AK_TRAP_EXIT:
1757 if (!attribute->have_arguments) {
1758 /* should have arguments */
1759 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1760 attribute->invalid = true;
1762 parse_gnu_attribute_const_arg(attribute);
1765 case GNU_AK_SECTION:
1766 case GNU_AK_SP_SWITCH:
1767 if (!attribute->have_arguments) {
1768 /* should have arguments */
1769 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1770 attribute->invalid = true;
1772 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1775 if (!attribute->have_arguments) {
1776 /* should have arguments */
1777 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1778 attribute->invalid = true;
1780 parse_gnu_attribute_format_args(attribute);
1782 case GNU_AK_WEAKREF:
1783 /* may have one string argument */
1784 if (attribute->have_arguments)
1785 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1787 case GNU_AK_NONNULL:
1788 if (attribute->have_arguments)
1789 parse_gnu_attribute_const_arg_list(attribute);
1791 case GNU_AK_TLS_MODEL:
1792 if (!attribute->have_arguments) {
1793 /* should have arguments */
1794 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1796 parse_gnu_attribute_tls_model_arg(attribute);
1798 case GNU_AK_VISIBILITY:
1799 if (!attribute->have_arguments) {
1800 /* should have arguments */
1801 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1803 parse_gnu_attribute_visibility_arg(attribute);
1806 if (!attribute->have_arguments) {
1807 /* should have arguments */
1808 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1810 parse_gnu_attribute_model_arg(attribute);
1814 if (!attribute->have_arguments) {
1815 /* should have arguments */
1816 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1818 parse_gnu_attribute_mode_arg(attribute);
1821 case GNU_AK_INTERRUPT:
1822 /* may have one string argument */
1823 if (attribute->have_arguments)
1824 parse_gnu_attribute_interrupt_arg(attribute);
1826 case GNU_AK_SENTINEL:
1827 /* may have one string argument */
1828 if (attribute->have_arguments)
1829 parse_gnu_attribute_const_arg(attribute);
1832 /* already handled */
1836 check_no_argument(attribute, name);
1839 if (attribute != NULL) {
1841 last->next = attribute;
1844 head = last = attribute;
1848 if (token.type != ',')
1862 * Parse GNU attributes.
1864 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1866 decl_modifiers_t modifiers = 0;
1869 switch (token.type) {
1870 case T___attribute__:
1871 modifiers |= parse_gnu_attribute(attributes);
1877 if (token.type != T_STRING_LITERAL) {
1878 parse_error_expected("while parsing assembler attribute",
1879 T_STRING_LITERAL, NULL);
1880 eat_until_matching_token('(');
1883 parse_string_literals();
1888 case T_cdecl: modifiers |= DM_CDECL; break;
1889 case T__fastcall: modifiers |= DM_FASTCALL; break;
1890 case T__stdcall: modifiers |= DM_STDCALL; break;
1893 /* TODO record modifier */
1895 warningf(HERE, "Ignoring declaration modifier '%K'", &token);
1899 default: return modifiers;
1906 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1908 static entity_t *determine_lhs_ent(expression_t *const expr,
1911 switch (expr->kind) {
1912 case EXPR_REFERENCE: {
1913 entity_t *const entity = expr->reference.entity;
1914 /* we should only find variables as lvalues... */
1915 if (entity->base.kind != ENTITY_VARIABLE
1916 && entity->base.kind != ENTITY_PARAMETER)
1922 case EXPR_ARRAY_ACCESS: {
1923 expression_t *const ref = expr->array_access.array_ref;
1924 entity_t * ent = NULL;
1925 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1926 ent = determine_lhs_ent(ref, lhs_ent);
1929 mark_vars_read(expr->select.compound, lhs_ent);
1931 mark_vars_read(expr->array_access.index, lhs_ent);
1936 if (is_type_compound(skip_typeref(expr->base.type))) {
1937 return determine_lhs_ent(expr->select.compound, lhs_ent);
1939 mark_vars_read(expr->select.compound, lhs_ent);
1944 case EXPR_UNARY_DEREFERENCE: {
1945 expression_t *const val = expr->unary.value;
1946 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1948 return determine_lhs_ent(val->unary.value, lhs_ent);
1950 mark_vars_read(val, NULL);
1956 mark_vars_read(expr, NULL);
1961 #define ENT_ANY ((entity_t*)-1)
1964 * Mark declarations, which are read. This is used to detect variables, which
1968 * x is not marked as "read", because it is only read to calculate its own new
1972 * x and y are not detected as "not read", because multiple variables are
1975 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
1977 switch (expr->kind) {
1978 case EXPR_REFERENCE: {
1979 entity_t *const entity = expr->reference.entity;
1980 if (entity->kind != ENTITY_VARIABLE
1981 && entity->kind != ENTITY_PARAMETER)
1984 if (lhs_ent != entity && lhs_ent != ENT_ANY) {
1985 if (entity->kind == ENTITY_VARIABLE) {
1986 entity->variable.read = true;
1988 entity->parameter.read = true;
1995 // TODO respect pure/const
1996 mark_vars_read(expr->call.function, NULL);
1997 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
1998 mark_vars_read(arg->expression, NULL);
2002 case EXPR_CONDITIONAL:
2003 // TODO lhs_decl should depend on whether true/false have an effect
2004 mark_vars_read(expr->conditional.condition, NULL);
2005 if (expr->conditional.true_expression != NULL)
2006 mark_vars_read(expr->conditional.true_expression, lhs_ent);
2007 mark_vars_read(expr->conditional.false_expression, lhs_ent);
2011 if (lhs_ent == ENT_ANY
2012 && !is_type_compound(skip_typeref(expr->base.type)))
2014 mark_vars_read(expr->select.compound, lhs_ent);
2017 case EXPR_ARRAY_ACCESS: {
2018 expression_t *const ref = expr->array_access.array_ref;
2019 mark_vars_read(ref, lhs_ent);
2020 lhs_ent = determine_lhs_ent(ref, lhs_ent);
2021 mark_vars_read(expr->array_access.index, lhs_ent);
2026 mark_vars_read(expr->va_arge.ap, lhs_ent);
2029 case EXPR_UNARY_CAST:
2030 /* Special case: Use void cast to mark a variable as "read" */
2031 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
2036 case EXPR_UNARY_THROW:
2037 if (expr->unary.value == NULL)
2040 case EXPR_UNARY_DEREFERENCE:
2041 case EXPR_UNARY_DELETE:
2042 case EXPR_UNARY_DELETE_ARRAY:
2043 if (lhs_ent == ENT_ANY)
2047 case EXPR_UNARY_NEGATE:
2048 case EXPR_UNARY_PLUS:
2049 case EXPR_UNARY_BITWISE_NEGATE:
2050 case EXPR_UNARY_NOT:
2051 case EXPR_UNARY_TAKE_ADDRESS:
2052 case EXPR_UNARY_POSTFIX_INCREMENT:
2053 case EXPR_UNARY_POSTFIX_DECREMENT:
2054 case EXPR_UNARY_PREFIX_INCREMENT:
2055 case EXPR_UNARY_PREFIX_DECREMENT:
2056 case EXPR_UNARY_CAST_IMPLICIT:
2057 case EXPR_UNARY_ASSUME:
2059 mark_vars_read(expr->unary.value, lhs_ent);
2062 case EXPR_BINARY_ADD:
2063 case EXPR_BINARY_SUB:
2064 case EXPR_BINARY_MUL:
2065 case EXPR_BINARY_DIV:
2066 case EXPR_BINARY_MOD:
2067 case EXPR_BINARY_EQUAL:
2068 case EXPR_BINARY_NOTEQUAL:
2069 case EXPR_BINARY_LESS:
2070 case EXPR_BINARY_LESSEQUAL:
2071 case EXPR_BINARY_GREATER:
2072 case EXPR_BINARY_GREATEREQUAL:
2073 case EXPR_BINARY_BITWISE_AND:
2074 case EXPR_BINARY_BITWISE_OR:
2075 case EXPR_BINARY_BITWISE_XOR:
2076 case EXPR_BINARY_LOGICAL_AND:
2077 case EXPR_BINARY_LOGICAL_OR:
2078 case EXPR_BINARY_SHIFTLEFT:
2079 case EXPR_BINARY_SHIFTRIGHT:
2080 case EXPR_BINARY_COMMA:
2081 case EXPR_BINARY_ISGREATER:
2082 case EXPR_BINARY_ISGREATEREQUAL:
2083 case EXPR_BINARY_ISLESS:
2084 case EXPR_BINARY_ISLESSEQUAL:
2085 case EXPR_BINARY_ISLESSGREATER:
2086 case EXPR_BINARY_ISUNORDERED:
2087 mark_vars_read(expr->binary.left, lhs_ent);
2088 mark_vars_read(expr->binary.right, lhs_ent);
2091 case EXPR_BINARY_ASSIGN:
2092 case EXPR_BINARY_MUL_ASSIGN:
2093 case EXPR_BINARY_DIV_ASSIGN:
2094 case EXPR_BINARY_MOD_ASSIGN:
2095 case EXPR_BINARY_ADD_ASSIGN:
2096 case EXPR_BINARY_SUB_ASSIGN:
2097 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2098 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2099 case EXPR_BINARY_BITWISE_AND_ASSIGN:
2100 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2101 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
2102 if (lhs_ent == ENT_ANY)
2104 lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
2105 mark_vars_read(expr->binary.right, lhs_ent);
2110 determine_lhs_ent(expr->va_starte.ap, lhs_ent);
2116 case EXPR_CHARACTER_CONSTANT:
2117 case EXPR_WIDE_CHARACTER_CONSTANT:
2118 case EXPR_STRING_LITERAL:
2119 case EXPR_WIDE_STRING_LITERAL:
2120 case EXPR_COMPOUND_LITERAL: // TODO init?
2122 case EXPR_CLASSIFY_TYPE:
2125 case EXPR_BUILTIN_SYMBOL:
2126 case EXPR_BUILTIN_CONSTANT_P:
2127 case EXPR_BUILTIN_PREFETCH:
2129 case EXPR_STATEMENT: // TODO
2130 case EXPR_LABEL_ADDRESS:
2131 case EXPR_BINARY_BUILTIN_EXPECT:
2132 case EXPR_REFERENCE_ENUM_VALUE:
2136 panic("unhandled expression");
2139 static designator_t *parse_designation(void)
2141 designator_t *result = NULL;
2142 designator_t *last = NULL;
2145 designator_t *designator;
2146 switch (token.type) {
2148 designator = allocate_ast_zero(sizeof(designator[0]));
2149 designator->source_position = token.source_position;
2151 add_anchor_token(']');
2152 designator->array_index = parse_constant_expression();
2153 rem_anchor_token(']');
2157 designator = allocate_ast_zero(sizeof(designator[0]));
2158 designator->source_position = token.source_position;
2160 if (token.type != T_IDENTIFIER) {
2161 parse_error_expected("while parsing designator",
2162 T_IDENTIFIER, NULL);
2165 designator->symbol = token.v.symbol;
2173 assert(designator != NULL);
2175 last->next = designator;
2177 result = designator;
2185 static initializer_t *initializer_from_string(array_type_t *type,
2186 const string_t *const string)
2188 /* TODO: check len vs. size of array type */
2191 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
2192 initializer->string.string = *string;
2197 static initializer_t *initializer_from_wide_string(array_type_t *const type,
2198 wide_string_t *const string)
2200 /* TODO: check len vs. size of array type */
2203 initializer_t *const initializer =
2204 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
2205 initializer->wide_string.string = *string;
2211 * Build an initializer from a given expression.
2213 static initializer_t *initializer_from_expression(type_t *orig_type,
2214 expression_t *expression)
2216 /* TODO check that expression is a constant expression */
2218 /* § 6.7.8.14/15 char array may be initialized by string literals */
2219 type_t *type = skip_typeref(orig_type);
2220 type_t *expr_type_orig = expression->base.type;
2221 type_t *expr_type = skip_typeref(expr_type_orig);
2222 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
2223 array_type_t *const array_type = &type->array;
2224 type_t *const element_type = skip_typeref(array_type->element_type);
2226 if (element_type->kind == TYPE_ATOMIC) {
2227 atomic_type_kind_t akind = element_type->atomic.akind;
2228 switch (expression->kind) {
2229 case EXPR_STRING_LITERAL:
2230 if (akind == ATOMIC_TYPE_CHAR
2231 || akind == ATOMIC_TYPE_SCHAR
2232 || akind == ATOMIC_TYPE_UCHAR) {
2233 return initializer_from_string(array_type,
2234 &expression->string.value);
2237 case EXPR_WIDE_STRING_LITERAL: {
2238 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
2239 if (get_unqualified_type(element_type) == bare_wchar_type) {
2240 return initializer_from_wide_string(array_type,
2241 &expression->wide_string.value);
2251 assign_error_t error = semantic_assign(type, expression);
2252 if (error == ASSIGN_ERROR_INCOMPATIBLE)
2254 report_assign_error(error, type, expression, "initializer",
2255 &expression->base.source_position);
2257 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2259 if (type->kind == TYPE_BITFIELD) {
2260 type = type->bitfield.base_type;
2263 result->value.value = create_implicit_cast(expression, type);
2269 * Checks if a given expression can be used as an constant initializer.
2271 static bool is_initializer_constant(const expression_t *expression)
2273 return is_constant_expression(expression)
2274 || is_address_constant(expression);
2278 * Parses an scalar initializer.
2280 * § 6.7.8.11; eat {} without warning
2282 static initializer_t *parse_scalar_initializer(type_t *type,
2283 bool must_be_constant)
2285 /* there might be extra {} hierarchies */
2287 if (token.type == '{') {
2289 warningf(HERE, "extra curly braces around scalar initializer");
2293 } while (token.type == '{');
2296 expression_t *expression = parse_assignment_expression();
2297 mark_vars_read(expression, NULL);
2298 if (must_be_constant && !is_initializer_constant(expression)) {
2299 errorf(&expression->base.source_position,
2300 "Initialisation expression '%E' is not constant",
2304 initializer_t *initializer = initializer_from_expression(type, expression);
2306 if (initializer == NULL) {
2307 errorf(&expression->base.source_position,
2308 "expression '%E' (type '%T') doesn't match expected type '%T'",
2309 expression, expression->base.type, type);
2314 bool additional_warning_displayed = false;
2315 while (braces > 0) {
2316 if (token.type == ',') {
2319 if (token.type != '}') {
2320 if (!additional_warning_displayed && warning.other) {
2321 warningf(HERE, "additional elements in scalar initializer");
2322 additional_warning_displayed = true;
2333 * An entry in the type path.
2335 typedef struct type_path_entry_t type_path_entry_t;
2336 struct type_path_entry_t {
2337 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2339 size_t index; /**< For array types: the current index. */
2340 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2345 * A type path expression a position inside compound or array types.
2347 typedef struct type_path_t type_path_t;
2348 struct type_path_t {
2349 type_path_entry_t *path; /**< An flexible array containing the current path. */
2350 type_t *top_type; /**< type of the element the path points */
2351 size_t max_index; /**< largest index in outermost array */
2355 * Prints a type path for debugging.
2357 static __attribute__((unused)) void debug_print_type_path(
2358 const type_path_t *path)
2360 size_t len = ARR_LEN(path->path);
2362 for (size_t i = 0; i < len; ++i) {
2363 const type_path_entry_t *entry = & path->path[i];
2365 type_t *type = skip_typeref(entry->type);
2366 if (is_type_compound(type)) {
2367 /* in gcc mode structs can have no members */
2368 if (entry->v.compound_entry == NULL) {
2372 fprintf(stderr, ".%s",
2373 entry->v.compound_entry->base.symbol->string);
2374 } else if (is_type_array(type)) {
2375 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
2377 fprintf(stderr, "-INVALID-");
2380 if (path->top_type != NULL) {
2381 fprintf(stderr, " (");
2382 print_type(path->top_type);
2383 fprintf(stderr, ")");
2388 * Return the top type path entry, ie. in a path
2389 * (type).a.b returns the b.
2391 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2393 size_t len = ARR_LEN(path->path);
2395 return &path->path[len-1];
2399 * Enlarge the type path by an (empty) element.
2401 static type_path_entry_t *append_to_type_path(type_path_t *path)
2403 size_t len = ARR_LEN(path->path);
2404 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2406 type_path_entry_t *result = & path->path[len];
2407 memset(result, 0, sizeof(result[0]));
2412 * Descending into a sub-type. Enter the scope of the current top_type.
2414 static void descend_into_subtype(type_path_t *path)
2416 type_t *orig_top_type = path->top_type;
2417 type_t *top_type = skip_typeref(orig_top_type);
2419 type_path_entry_t *top = append_to_type_path(path);
2420 top->type = top_type;
2422 if (is_type_compound(top_type)) {
2423 compound_t *compound = top_type->compound.compound;
2424 entity_t *entry = compound->members.entities;
2426 if (entry != NULL) {
2427 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2428 top->v.compound_entry = &entry->declaration;
2429 path->top_type = entry->declaration.type;
2431 path->top_type = NULL;
2433 } else if (is_type_array(top_type)) {
2435 path->top_type = top_type->array.element_type;
2437 assert(!is_type_valid(top_type));
2442 * Pop an entry from the given type path, ie. returning from
2443 * (type).a.b to (type).a
2445 static void ascend_from_subtype(type_path_t *path)
2447 type_path_entry_t *top = get_type_path_top(path);
2449 path->top_type = top->type;
2451 size_t len = ARR_LEN(path->path);
2452 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2456 * Pop entries from the given type path until the given
2457 * path level is reached.
2459 static void ascend_to(type_path_t *path, size_t top_path_level)
2461 size_t len = ARR_LEN(path->path);
2463 while (len > top_path_level) {
2464 ascend_from_subtype(path);
2465 len = ARR_LEN(path->path);
2469 static bool walk_designator(type_path_t *path, const designator_t *designator,
2470 bool used_in_offsetof)
2472 for (; designator != NULL; designator = designator->next) {
2473 type_path_entry_t *top = get_type_path_top(path);
2474 type_t *orig_type = top->type;
2476 type_t *type = skip_typeref(orig_type);
2478 if (designator->symbol != NULL) {
2479 symbol_t *symbol = designator->symbol;
2480 if (!is_type_compound(type)) {
2481 if (is_type_valid(type)) {
2482 errorf(&designator->source_position,
2483 "'.%Y' designator used for non-compound type '%T'",
2487 top->type = type_error_type;
2488 top->v.compound_entry = NULL;
2489 orig_type = type_error_type;
2491 compound_t *compound = type->compound.compound;
2492 entity_t *iter = compound->members.entities;
2493 for (; iter != NULL; iter = iter->base.next) {
2494 if (iter->base.symbol == symbol) {
2499 errorf(&designator->source_position,
2500 "'%T' has no member named '%Y'", orig_type, symbol);
2503 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2504 if (used_in_offsetof) {
2505 type_t *real_type = skip_typeref(iter->declaration.type);
2506 if (real_type->kind == TYPE_BITFIELD) {
2507 errorf(&designator->source_position,
2508 "offsetof designator '%Y' may not specify bitfield",
2514 top->type = orig_type;
2515 top->v.compound_entry = &iter->declaration;
2516 orig_type = iter->declaration.type;
2519 expression_t *array_index = designator->array_index;
2520 assert(designator->array_index != NULL);
2522 if (!is_type_array(type)) {
2523 if (is_type_valid(type)) {
2524 errorf(&designator->source_position,
2525 "[%E] designator used for non-array type '%T'",
2526 array_index, orig_type);
2531 long index = fold_constant(array_index);
2532 if (!used_in_offsetof) {
2534 errorf(&designator->source_position,
2535 "array index [%E] must be positive", array_index);
2536 } else if (type->array.size_constant) {
2537 long array_size = type->array.size;
2538 if (index >= array_size) {
2539 errorf(&designator->source_position,
2540 "designator [%E] (%d) exceeds array size %d",
2541 array_index, index, array_size);
2546 top->type = orig_type;
2547 top->v.index = (size_t) index;
2548 orig_type = type->array.element_type;
2550 path->top_type = orig_type;
2552 if (designator->next != NULL) {
2553 descend_into_subtype(path);
2562 static void advance_current_object(type_path_t *path, size_t top_path_level)
2564 type_path_entry_t *top = get_type_path_top(path);
2566 type_t *type = skip_typeref(top->type);
2567 if (is_type_union(type)) {
2568 /* in unions only the first element is initialized */
2569 top->v.compound_entry = NULL;
2570 } else if (is_type_struct(type)) {
2571 declaration_t *entry = top->v.compound_entry;
2573 entity_t *next_entity = entry->base.next;
2574 if (next_entity != NULL) {
2575 assert(is_declaration(next_entity));
2576 entry = &next_entity->declaration;
2581 top->v.compound_entry = entry;
2582 if (entry != NULL) {
2583 path->top_type = entry->type;
2586 } else if (is_type_array(type)) {
2587 assert(is_type_array(type));
2591 if (!type->array.size_constant || top->v.index < type->array.size) {
2595 assert(!is_type_valid(type));
2599 /* we're past the last member of the current sub-aggregate, try if we
2600 * can ascend in the type hierarchy and continue with another subobject */
2601 size_t len = ARR_LEN(path->path);
2603 if (len > top_path_level) {
2604 ascend_from_subtype(path);
2605 advance_current_object(path, top_path_level);
2607 path->top_type = NULL;
2612 * skip until token is found.
2614 static void skip_until(int type)
2616 while (token.type != type) {
2617 if (token.type == T_EOF)
2624 * skip any {...} blocks until a closing bracket is reached.
2626 static void skip_initializers(void)
2628 if (token.type == '{')
2631 while (token.type != '}') {
2632 if (token.type == T_EOF)
2634 if (token.type == '{') {
2642 static initializer_t *create_empty_initializer(void)
2644 static initializer_t empty_initializer
2645 = { .list = { { INITIALIZER_LIST }, 0 } };
2646 return &empty_initializer;
2650 * Parse a part of an initialiser for a struct or union,
2652 static initializer_t *parse_sub_initializer(type_path_t *path,
2653 type_t *outer_type, size_t top_path_level,
2654 parse_initializer_env_t *env)
2656 if (token.type == '}') {
2657 /* empty initializer */
2658 return create_empty_initializer();
2661 type_t *orig_type = path->top_type;
2662 type_t *type = NULL;
2664 if (orig_type == NULL) {
2665 /* We are initializing an empty compound. */
2667 type = skip_typeref(orig_type);
2670 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2673 designator_t *designator = NULL;
2674 if (token.type == '.' || token.type == '[') {
2675 designator = parse_designation();
2676 goto finish_designator;
2677 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2678 /* GNU-style designator ("identifier: value") */
2679 designator = allocate_ast_zero(sizeof(designator[0]));
2680 designator->source_position = token.source_position;
2681 designator->symbol = token.v.symbol;
2686 /* reset path to toplevel, evaluate designator from there */
2687 ascend_to(path, top_path_level);
2688 if (!walk_designator(path, designator, false)) {
2689 /* can't continue after designation error */
2693 initializer_t *designator_initializer
2694 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2695 designator_initializer->designator.designator = designator;
2696 ARR_APP1(initializer_t*, initializers, designator_initializer);
2698 orig_type = path->top_type;
2699 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2704 if (token.type == '{') {
2705 if (type != NULL && is_type_scalar(type)) {
2706 sub = parse_scalar_initializer(type, env->must_be_constant);
2710 if (env->entity != NULL) {
2712 "extra brace group at end of initializer for '%Y'",
2713 env->entity->base.symbol);
2715 errorf(HERE, "extra brace group at end of initializer");
2718 descend_into_subtype(path);
2720 add_anchor_token('}');
2721 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2723 rem_anchor_token('}');
2726 ascend_from_subtype(path);
2730 goto error_parse_next;
2734 /* must be an expression */
2735 expression_t *expression = parse_assignment_expression();
2737 if (env->must_be_constant && !is_initializer_constant(expression)) {
2738 errorf(&expression->base.source_position,
2739 "Initialisation expression '%E' is not constant",
2744 /* we are already outside, ... */
2745 type_t *const outer_type_skip = skip_typeref(outer_type);
2746 if (is_type_compound(outer_type_skip) &&
2747 !outer_type_skip->compound.compound->complete) {
2748 goto error_parse_next;
2753 /* handle { "string" } special case */
2754 if ((expression->kind == EXPR_STRING_LITERAL
2755 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2756 && outer_type != NULL) {
2757 sub = initializer_from_expression(outer_type, expression);
2759 if (token.type == ',') {
2762 if (token.type != '}' && warning.other) {
2763 warningf(HERE, "excessive elements in initializer for type '%T'",
2766 /* TODO: eat , ... */
2771 /* descend into subtypes until expression matches type */
2773 orig_type = path->top_type;
2774 type = skip_typeref(orig_type);
2776 sub = initializer_from_expression(orig_type, expression);
2780 if (!is_type_valid(type)) {
2783 if (is_type_scalar(type)) {
2784 errorf(&expression->base.source_position,
2785 "expression '%E' doesn't match expected type '%T'",
2786 expression, orig_type);
2790 descend_into_subtype(path);
2794 /* update largest index of top array */
2795 const type_path_entry_t *first = &path->path[0];
2796 type_t *first_type = first->type;
2797 first_type = skip_typeref(first_type);
2798 if (is_type_array(first_type)) {
2799 size_t index = first->v.index;
2800 if (index > path->max_index)
2801 path->max_index = index;
2805 /* append to initializers list */
2806 ARR_APP1(initializer_t*, initializers, sub);
2809 if (warning.other) {
2810 if (env->entity != NULL) {
2811 warningf(HERE, "excess elements in struct initializer for '%Y'",
2812 env->entity->base.symbol);
2814 warningf(HERE, "excess elements in struct initializer");
2820 if (token.type == '}') {
2824 if (token.type == '}') {
2829 /* advance to the next declaration if we are not at the end */
2830 advance_current_object(path, top_path_level);
2831 orig_type = path->top_type;
2832 if (orig_type != NULL)
2833 type = skip_typeref(orig_type);
2839 size_t len = ARR_LEN(initializers);
2840 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2841 initializer_t *result = allocate_ast_zero(size);
2842 result->kind = INITIALIZER_LIST;
2843 result->list.len = len;
2844 memcpy(&result->list.initializers, initializers,
2845 len * sizeof(initializers[0]));
2847 DEL_ARR_F(initializers);
2848 ascend_to(path, top_path_level+1);
2853 skip_initializers();
2854 DEL_ARR_F(initializers);
2855 ascend_to(path, top_path_level+1);
2860 * Parses an initializer. Parsers either a compound literal
2861 * (env->declaration == NULL) or an initializer of a declaration.
2863 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2865 type_t *type = skip_typeref(env->type);
2866 initializer_t *result = NULL;
2869 if (is_type_scalar(type)) {
2870 result = parse_scalar_initializer(type, env->must_be_constant);
2871 } else if (token.type == '{') {
2875 memset(&path, 0, sizeof(path));
2876 path.top_type = env->type;
2877 path.path = NEW_ARR_F(type_path_entry_t, 0);
2879 descend_into_subtype(&path);
2881 add_anchor_token('}');
2882 result = parse_sub_initializer(&path, env->type, 1, env);
2883 rem_anchor_token('}');
2885 max_index = path.max_index;
2886 DEL_ARR_F(path.path);
2890 /* parse_scalar_initializer() also works in this case: we simply
2891 * have an expression without {} around it */
2892 result = parse_scalar_initializer(type, env->must_be_constant);
2895 /* § 6.7.8 (22) array initializers for arrays with unknown size determine
2896 * the array type size */
2897 if (is_type_array(type) && type->array.size_expression == NULL
2898 && result != NULL) {
2900 switch (result->kind) {
2901 case INITIALIZER_LIST:
2902 size = max_index + 1;
2905 case INITIALIZER_STRING:
2906 size = result->string.string.size;
2909 case INITIALIZER_WIDE_STRING:
2910 size = result->wide_string.string.size;
2913 case INITIALIZER_DESIGNATOR:
2914 case INITIALIZER_VALUE:
2915 /* can happen for parse errors */
2920 internal_errorf(HERE, "invalid initializer type");
2923 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2924 cnst->base.type = type_size_t;
2925 cnst->conste.v.int_value = size;
2927 type_t *new_type = duplicate_type(type);
2929 new_type->array.size_expression = cnst;
2930 new_type->array.size_constant = true;
2931 new_type->array.has_implicit_size = true;
2932 new_type->array.size = size;
2933 env->type = new_type;
2941 static void append_entity(scope_t *scope, entity_t *entity)
2943 if (scope->last_entity != NULL) {
2944 scope->last_entity->base.next = entity;
2946 scope->entities = entity;
2948 scope->last_entity = entity;
2952 static compound_t *parse_compound_type_specifier(bool is_struct)
2954 gnu_attribute_t *attributes = NULL;
2955 decl_modifiers_t modifiers = 0;
2962 symbol_t *symbol = NULL;
2963 compound_t *compound = NULL;
2965 if (token.type == T___attribute__) {
2966 modifiers |= parse_attributes(&attributes);
2969 if (token.type == T_IDENTIFIER) {
2970 symbol = token.v.symbol;
2973 namespace_tag_t const namespc =
2974 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2975 entity_t *entity = get_entity(symbol, namespc);
2976 if (entity != NULL) {
2977 assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION));
2978 compound = &entity->compound;
2979 if (compound->base.parent_scope != current_scope &&
2980 (token.type == '{' || token.type == ';')) {
2981 /* we're in an inner scope and have a definition. Override
2982 existing definition in outer scope */
2984 } else if (compound->complete && token.type == '{') {
2985 assert(symbol != NULL);
2986 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
2987 is_struct ? "struct" : "union", symbol,
2988 &compound->base.source_position);
2989 /* clear members in the hope to avoid further errors */
2990 compound->members.entities = NULL;
2993 } else if (token.type != '{') {
2995 parse_error_expected("while parsing struct type specifier",
2996 T_IDENTIFIER, '{', NULL);
2998 parse_error_expected("while parsing union type specifier",
2999 T_IDENTIFIER, '{', NULL);
3005 if (compound == NULL) {
3006 entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
3007 entity_t *entity = allocate_entity_zero(kind);
3008 compound = &entity->compound;
3010 compound->base.namespc =
3011 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
3012 compound->base.source_position = token.source_position;
3013 compound->base.symbol = symbol;
3014 compound->base.parent_scope = current_scope;
3015 if (symbol != NULL) {
3016 environment_push(entity);
3018 append_entity(current_scope, entity);
3021 if (token.type == '{') {
3022 parse_compound_type_entries(compound);
3023 modifiers |= parse_attributes(&attributes);
3025 if (symbol == NULL) {
3026 assert(anonymous_entity == NULL);
3027 anonymous_entity = (entity_t*)compound;
3031 compound->modifiers |= modifiers;
3035 static void parse_enum_entries(type_t *const enum_type)
3039 if (token.type == '}') {
3040 errorf(HERE, "empty enum not allowed");
3045 add_anchor_token('}');
3047 if (token.type != T_IDENTIFIER) {
3048 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
3050 rem_anchor_token('}');
3054 entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE);
3055 entity->enum_value.enum_type = enum_type;
3056 entity->base.symbol = token.v.symbol;
3057 entity->base.source_position = token.source_position;
3060 if (token.type == '=') {
3062 expression_t *value = parse_constant_expression();
3064 value = create_implicit_cast(value, enum_type);
3065 entity->enum_value.value = value;
3070 record_entity(entity, false);
3072 if (token.type != ',')
3075 } while (token.type != '}');
3076 rem_anchor_token('}');
3084 static type_t *parse_enum_specifier(void)
3086 gnu_attribute_t *attributes = NULL;
3091 if (token.type == T_IDENTIFIER) {
3092 symbol = token.v.symbol;
3095 entity = get_entity(symbol, NAMESPACE_ENUM);
3096 assert(entity == NULL || entity->kind == ENTITY_ENUM);
3097 } else if (token.type != '{') {
3098 parse_error_expected("while parsing enum type specifier",
3099 T_IDENTIFIER, '{', NULL);
3106 if (entity == NULL) {
3107 entity = allocate_entity_zero(ENTITY_ENUM);
3108 entity->base.namespc = NAMESPACE_ENUM;
3109 entity->base.source_position = token.source_position;
3110 entity->base.symbol = symbol;
3111 entity->base.parent_scope = current_scope;
3114 type_t *const type = allocate_type_zero(TYPE_ENUM);
3115 type->enumt.enume = &entity->enume;
3117 if (token.type == '{') {
3118 if (entity->enume.complete) {
3119 errorf(HERE, "multiple definitions of enum %Y (previous definition %P)",
3120 symbol, &entity->base.source_position);
3122 if (symbol != NULL) {
3123 environment_push(entity);
3125 append_entity(current_scope, entity);
3126 entity->enume.complete = true;
3128 parse_enum_entries(type);
3129 parse_attributes(&attributes);
3131 if (symbol == NULL) {
3132 assert(anonymous_entity == NULL);
3133 anonymous_entity = entity;
3135 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
3136 errorf(HERE, "enum %Y used before definition (incomplete enumes are a GNU extension)",
3144 * if a symbol is a typedef to another type, return true
3146 static bool is_typedef_symbol(symbol_t *symbol)
3148 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
3149 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
3152 static type_t *parse_typeof(void)
3159 add_anchor_token(')');
3161 expression_t *expression = NULL;
3163 bool old_type_prop = in_type_prop;
3164 bool old_gcc_extension = in_gcc_extension;
3165 in_type_prop = true;
3167 while (token.type == T___extension__) {
3168 /* This can be a prefix to a typename or an expression. */
3170 in_gcc_extension = true;
3172 switch (token.type) {
3174 if (is_typedef_symbol(token.v.symbol)) {
3175 type = parse_typename();
3177 expression = parse_expression();
3178 type = expression->base.type;
3183 type = parse_typename();
3187 expression = parse_expression();
3188 type = expression->base.type;
3191 in_type_prop = old_type_prop;
3192 in_gcc_extension = old_gcc_extension;
3194 rem_anchor_token(')');
3197 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
3198 typeof_type->typeoft.expression = expression;
3199 typeof_type->typeoft.typeof_type = type;
3206 typedef enum specifiers_t {
3207 SPECIFIER_SIGNED = 1 << 0,
3208 SPECIFIER_UNSIGNED = 1 << 1,
3209 SPECIFIER_LONG = 1 << 2,
3210 SPECIFIER_INT = 1 << 3,
3211 SPECIFIER_DOUBLE = 1 << 4,
3212 SPECIFIER_CHAR = 1 << 5,
3213 SPECIFIER_SHORT = 1 << 6,
3214 SPECIFIER_LONG_LONG = 1 << 7,
3215 SPECIFIER_FLOAT = 1 << 8,
3216 SPECIFIER_BOOL = 1 << 9,
3217 SPECIFIER_VOID = 1 << 10,
3218 SPECIFIER_INT8 = 1 << 11,
3219 SPECIFIER_INT16 = 1 << 12,
3220 SPECIFIER_INT32 = 1 << 13,
3221 SPECIFIER_INT64 = 1 << 14,
3222 SPECIFIER_INT128 = 1 << 15,
3223 SPECIFIER_COMPLEX = 1 << 16,
3224 SPECIFIER_IMAGINARY = 1 << 17,
3227 static type_t *create_builtin_type(symbol_t *const symbol,
3228 type_t *const real_type)
3230 type_t *type = allocate_type_zero(TYPE_BUILTIN);
3231 type->builtin.symbol = symbol;
3232 type->builtin.real_type = real_type;
3234 type_t *result = typehash_insert(type);
3235 if (type != result) {
3242 static type_t *get_typedef_type(symbol_t *symbol)
3244 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3245 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
3248 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
3249 type->typedeft.typedefe = &entity->typedefe;
3255 * check for the allowed MS alignment values.
3257 static bool check_alignment_value(long long intvalue)
3259 if (intvalue < 1 || intvalue > 8192) {
3260 errorf(HERE, "illegal alignment value");
3263 unsigned v = (unsigned)intvalue;
3264 for (unsigned i = 1; i <= 8192; i += i) {
3268 errorf(HERE, "alignment must be power of two");
3272 #define DET_MOD(name, tag) do { \
3273 if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \
3274 *modifiers |= tag; \
3277 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
3279 decl_modifiers_t *modifiers = &specifiers->modifiers;
3282 if (token.type == T_restrict) {
3284 DET_MOD(restrict, DM_RESTRICT);
3286 } else if (token.type != T_IDENTIFIER)
3288 symbol_t *symbol = token.v.symbol;
3289 if (symbol == sym_align) {
3292 if (token.type != T_INTEGER)
3294 if (check_alignment_value(token.v.intvalue)) {
3295 if (specifiers->alignment != 0 && warning.other)
3296 warningf(HERE, "align used more than once");
3297 specifiers->alignment = (unsigned char)token.v.intvalue;
3301 } else if (symbol == sym_allocate) {
3304 if (token.type != T_IDENTIFIER)
3306 (void)token.v.symbol;
3308 } else if (symbol == sym_dllimport) {
3310 DET_MOD(dllimport, DM_DLLIMPORT);
3311 } else if (symbol == sym_dllexport) {
3313 DET_MOD(dllexport, DM_DLLEXPORT);
3314 } else if (symbol == sym_thread) {
3316 DET_MOD(thread, DM_THREAD);
3317 } else if (symbol == sym_naked) {
3319 DET_MOD(naked, DM_NAKED);
3320 } else if (symbol == sym_noinline) {
3322 DET_MOD(noinline, DM_NOINLINE);
3323 } else if (symbol == sym_noreturn) {
3325 DET_MOD(noreturn, DM_NORETURN);
3326 } else if (symbol == sym_nothrow) {
3328 DET_MOD(nothrow, DM_NOTHROW);
3329 } else if (symbol == sym_novtable) {
3331 DET_MOD(novtable, DM_NOVTABLE);
3332 } else if (symbol == sym_property) {
3336 bool is_get = false;
3337 if (token.type != T_IDENTIFIER)
3339 if (token.v.symbol == sym_get) {
3341 } else if (token.v.symbol == sym_put) {
3343 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3348 if (token.type != T_IDENTIFIER)
3351 if (specifiers->get_property_sym != NULL) {
3352 errorf(HERE, "get property name already specified");
3354 specifiers->get_property_sym = token.v.symbol;
3357 if (specifiers->put_property_sym != NULL) {
3358 errorf(HERE, "put property name already specified");
3360 specifiers->put_property_sym = token.v.symbol;
3364 if (token.type == ',') {
3371 } else if (symbol == sym_selectany) {
3373 DET_MOD(selectany, DM_SELECTANY);
3374 } else if (symbol == sym_uuid) {
3377 if (token.type != T_STRING_LITERAL)
3381 } else if (symbol == sym_deprecated) {
3383 if (specifiers->deprecated != 0 && warning.other)
3384 warningf(HERE, "deprecated used more than once");
3385 specifiers->deprecated = true;
3386 if (token.type == '(') {
3388 if (token.type == T_STRING_LITERAL) {
3389 specifiers->deprecated_string = token.v.string.begin;
3392 errorf(HERE, "string literal expected");
3396 } else if (symbol == sym_noalias) {
3398 DET_MOD(noalias, DM_NOALIAS);
3401 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3403 if (token.type == '(')
3407 if (token.type == ',')
3414 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
3416 entity_t *entity = allocate_entity_zero(kind);
3417 entity->base.source_position = *HERE;
3418 entity->base.symbol = symbol;
3419 if (is_declaration(entity)) {
3420 entity->declaration.type = type_error_type;
3421 entity->declaration.implicit = true;
3422 } else if (kind == ENTITY_TYPEDEF) {
3423 entity->typedefe.type = type_error_type;
3425 record_entity(entity, false);
3429 static void parse_microsoft_based(based_spec_t *based_spec)
3431 if (token.type != T_IDENTIFIER) {
3432 parse_error_expected("while parsing __based", T_IDENTIFIER, NULL);
3435 symbol_t *symbol = token.v.symbol;
3436 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3438 if (entity == NULL || entity->base.kind != ENTITY_VARIABLE) {
3439 errorf(HERE, "'%Y' is not a variable name.", symbol);
3440 entity = create_error_entity(symbol, ENTITY_VARIABLE);
3442 variable_t *variable = &entity->variable;
3444 if (based_spec->base_variable != NULL) {
3445 errorf(HERE, "__based type qualifier specified more than once");
3447 based_spec->source_position = token.source_position;
3448 based_spec->base_variable = variable;
3450 type_t *const type = variable->base.type;
3452 if (is_type_valid(type)) {
3453 if (! is_type_pointer(skip_typeref(type))) {
3454 errorf(HERE, "variable in __based modifier must have pointer type instead of '%T'", type);
3456 if (variable->base.base.parent_scope != file_scope) {
3457 errorf(HERE, "a nonstatic local variable may not be used in a __based specification");
3465 * Finish the construction of a struct type by calculating
3466 * its size, offsets, alignment.
3468 static void finish_struct_type(compound_type_t *type)
3470 assert(type->compound != NULL);
3472 compound_t *compound = type->compound;
3473 if (!compound->complete)
3478 il_alignment_t alignment = 1;
3479 bool need_pad = false;
3481 entity_t *entry = compound->members.entities;
3482 for (; entry != NULL; entry = entry->base.next) {
3483 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3486 type_t *m_type = skip_typeref(entry->declaration.type);
3487 if (! is_type_valid(m_type)) {
3488 /* simply ignore errors here */
3491 il_alignment_t m_alignment = m_type->base.alignment;
3492 if (m_alignment > alignment)
3493 alignment = m_alignment;
3495 offset = (size + m_alignment - 1) & -m_alignment;
3499 entry->compound_member.offset = offset;
3500 size = offset + m_type->base.size;
3502 if (type->base.alignment != 0) {
3503 alignment = type->base.alignment;
3506 offset = (size + alignment - 1) & -alignment;
3510 if (warning.padded && need_pad) {
3511 warningf(&compound->base.source_position,
3512 "'%#T' needs padding", type, compound->base.symbol);
3514 if (warning.packed && !need_pad) {
3515 warningf(&compound->base.source_position,
3516 "superfluous packed attribute on '%#T'",
3517 type, compound->base.symbol);
3520 type->base.size = offset;
3521 type->base.alignment = alignment;
3525 * Finish the construction of an union type by calculating
3526 * its size and alignment.
3528 static void finish_union_type(compound_type_t *type)
3530 assert(type->compound != NULL);
3532 compound_t *compound = type->compound;
3533 if (! compound->complete)
3537 il_alignment_t alignment = 1;
3539 entity_t *entry = compound->members.entities;
3540 for (; entry != NULL; entry = entry->base.next) {
3541 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3544 type_t *m_type = skip_typeref(entry->declaration.type);
3545 if (! is_type_valid(m_type))
3548 entry->compound_member.offset = 0;
3549 if (m_type->base.size > size)
3550 size = m_type->base.size;
3551 if (m_type->base.alignment > alignment)
3552 alignment = m_type->base.alignment;
3554 if (type->base.alignment != 0) {
3555 alignment = type->base.alignment;
3557 size = (size + alignment - 1) & -alignment;
3558 type->base.size = size;
3559 type->base.alignment = alignment;
3562 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3564 type_t *type = NULL;
3565 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3566 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3567 unsigned type_specifiers = 0;
3568 bool newtype = false;
3569 bool saw_error = false;
3570 bool old_gcc_extension = in_gcc_extension;
3572 specifiers->source_position = token.source_position;
3575 specifiers->modifiers
3576 |= parse_attributes(&specifiers->gnu_attributes);
3577 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3578 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3580 switch (token.type) {
3582 #define MATCH_STORAGE_CLASS(token, class) \
3584 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3585 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3587 specifiers->storage_class = class; \
3588 if (specifiers->thread_local) \
3589 goto check_thread_storage_class; \
3593 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3594 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3595 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3596 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3597 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3602 add_anchor_token(')');
3603 parse_microsoft_extended_decl_modifier(specifiers);
3604 rem_anchor_token(')');
3609 if (specifiers->thread_local) {
3610 errorf(HERE, "duplicate '__thread'");
3612 specifiers->thread_local = true;
3613 check_thread_storage_class:
3614 switch (specifiers->storage_class) {
3615 case STORAGE_CLASS_EXTERN:
3616 case STORAGE_CLASS_NONE:
3617 case STORAGE_CLASS_STATIC:
3621 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3622 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3623 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3624 wrong_thread_stoarge_class:
3625 errorf(HERE, "'__thread' used with '%s'", wrong);
3632 /* type qualifiers */
3633 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3635 qualifiers |= qualifier; \
3639 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3640 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3641 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3642 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3643 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3644 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3645 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3646 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3648 case T___extension__:
3650 in_gcc_extension = true;
3653 /* type specifiers */
3654 #define MATCH_SPECIFIER(token, specifier, name) \
3656 if (type_specifiers & specifier) { \
3657 errorf(HERE, "multiple " name " type specifiers given"); \
3659 type_specifiers |= specifier; \
3664 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3665 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3666 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3667 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3668 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3669 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3670 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3671 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3672 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3673 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3674 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3675 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3676 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3677 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3678 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3679 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3680 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3682 case T__forceinline:
3683 /* only in microsoft mode */
3684 specifiers->modifiers |= DM_FORCEINLINE;
3689 specifiers->is_inline = true;
3693 if (type_specifiers & SPECIFIER_LONG_LONG) {
3694 errorf(HERE, "multiple type specifiers given");
3695 } else if (type_specifiers & SPECIFIER_LONG) {
3696 type_specifiers |= SPECIFIER_LONG_LONG;
3698 type_specifiers |= SPECIFIER_LONG;
3704 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3706 type->compound.compound = parse_compound_type_specifier(true);
3707 finish_struct_type(&type->compound);
3711 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3712 type->compound.compound = parse_compound_type_specifier(false);
3713 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3714 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3715 finish_union_type(&type->compound);
3719 type = parse_enum_specifier();
3722 type = parse_typeof();
3724 case T___builtin_va_list:
3725 type = duplicate_type(type_valist);
3729 case T_IDENTIFIER: {
3730 /* only parse identifier if we haven't found a type yet */
3731 if (type != NULL || type_specifiers != 0) {
3732 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3733 * declaration, so it doesn't generate errors about expecting '(' or
3735 switch (look_ahead(1)->type) {
3742 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3746 errorf(HERE, "discarding stray '%K' in declaration specifier", &token);
3751 goto finish_specifiers;
3755 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3756 if (typedef_type == NULL) {
3757 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3758 * declaration, so it doesn't generate 'implicit int' followed by more
3759 * errors later on. */
3760 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3766 errorf(HERE, "'%K' does not name a type", &token);
3769 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3771 type = allocate_type_zero(TYPE_TYPEDEF);
3772 type->typedeft.typedefe = &entity->typedefe;
3776 if (la1_type == '&' || la1_type == '*')
3777 goto finish_specifiers;
3782 goto finish_specifiers;
3787 type = typedef_type;
3791 /* function specifier */
3793 goto finish_specifiers;
3798 in_gcc_extension = old_gcc_extension;
3800 if (type == NULL || (saw_error && type_specifiers != 0)) {
3801 atomic_type_kind_t atomic_type;
3803 /* match valid basic types */
3804 switch (type_specifiers) {
3805 case SPECIFIER_VOID:
3806 atomic_type = ATOMIC_TYPE_VOID;
3808 case SPECIFIER_CHAR:
3809 atomic_type = ATOMIC_TYPE_CHAR;
3811 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3812 atomic_type = ATOMIC_TYPE_SCHAR;
3814 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3815 atomic_type = ATOMIC_TYPE_UCHAR;
3817 case SPECIFIER_SHORT:
3818 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3819 case SPECIFIER_SHORT | SPECIFIER_INT:
3820 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3821 atomic_type = ATOMIC_TYPE_SHORT;
3823 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3824 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3825 atomic_type = ATOMIC_TYPE_USHORT;
3828 case SPECIFIER_SIGNED:
3829 case SPECIFIER_SIGNED | SPECIFIER_INT:
3830 atomic_type = ATOMIC_TYPE_INT;
3832 case SPECIFIER_UNSIGNED:
3833 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3834 atomic_type = ATOMIC_TYPE_UINT;
3836 case SPECIFIER_LONG:
3837 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3838 case SPECIFIER_LONG | SPECIFIER_INT:
3839 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3840 atomic_type = ATOMIC_TYPE_LONG;
3842 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3843 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3844 atomic_type = ATOMIC_TYPE_ULONG;
3847 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3848 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3849 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3850 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3852 atomic_type = ATOMIC_TYPE_LONGLONG;
3853 goto warn_about_long_long;
3855 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3856 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3858 atomic_type = ATOMIC_TYPE_ULONGLONG;
3859 warn_about_long_long:
3860 if (warning.long_long) {
3861 warningf(&specifiers->source_position,
3862 "ISO C90 does not support 'long long'");
3866 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3867 atomic_type = unsigned_int8_type_kind;
3870 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3871 atomic_type = unsigned_int16_type_kind;
3874 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3875 atomic_type = unsigned_int32_type_kind;
3878 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3879 atomic_type = unsigned_int64_type_kind;
3882 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3883 atomic_type = unsigned_int128_type_kind;
3886 case SPECIFIER_INT8:
3887 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3888 atomic_type = int8_type_kind;
3891 case SPECIFIER_INT16:
3892 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3893 atomic_type = int16_type_kind;
3896 case SPECIFIER_INT32:
3897 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3898 atomic_type = int32_type_kind;
3901 case SPECIFIER_INT64:
3902 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3903 atomic_type = int64_type_kind;
3906 case SPECIFIER_INT128:
3907 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3908 atomic_type = int128_type_kind;
3911 case SPECIFIER_FLOAT:
3912 atomic_type = ATOMIC_TYPE_FLOAT;
3914 case SPECIFIER_DOUBLE:
3915 atomic_type = ATOMIC_TYPE_DOUBLE;
3917 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3918 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3920 case SPECIFIER_BOOL:
3921 atomic_type = ATOMIC_TYPE_BOOL;
3923 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3924 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3925 atomic_type = ATOMIC_TYPE_FLOAT;
3927 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3928 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3929 atomic_type = ATOMIC_TYPE_DOUBLE;
3931 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3932 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3933 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3936 /* invalid specifier combination, give an error message */
3937 if (type_specifiers == 0) {
3941 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3942 if (!(c_mode & _CXX) && !strict_mode) {
3943 if (warning.implicit_int) {
3944 warningf(HERE, "no type specifiers in declaration, using 'int'");
3946 atomic_type = ATOMIC_TYPE_INT;
3949 errorf(HERE, "no type specifiers given in declaration");
3951 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3952 (type_specifiers & SPECIFIER_UNSIGNED)) {
3953 errorf(HERE, "signed and unsigned specifiers given");
3954 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3955 errorf(HERE, "only integer types can be signed or unsigned");
3957 errorf(HERE, "multiple datatypes in declaration");
3962 if (type_specifiers & SPECIFIER_COMPLEX) {
3963 type = allocate_type_zero(TYPE_COMPLEX);
3964 type->complex.akind = atomic_type;
3965 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3966 type = allocate_type_zero(TYPE_IMAGINARY);
3967 type->imaginary.akind = atomic_type;
3969 type = allocate_type_zero(TYPE_ATOMIC);
3970 type->atomic.akind = atomic_type;
3973 } else if (type_specifiers != 0) {
3974 errorf(HERE, "multiple datatypes in declaration");
3977 /* FIXME: check type qualifiers here */
3979 type->base.qualifiers = qualifiers;
3980 type->base.modifiers = modifiers;
3982 type_t *result = typehash_insert(type);
3983 if (newtype && result != type) {
3987 specifiers->type = result;
3991 specifiers->type = type_error_type;
3995 static type_qualifiers_t parse_type_qualifiers(void)
3997 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
4000 switch (token.type) {
4001 /* type qualifiers */
4002 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
4003 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
4004 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
4005 /* microsoft extended type modifiers */
4006 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4007 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4008 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4009 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4010 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4019 * Parses an K&R identifier list
4021 static void parse_identifier_list(scope_t *scope)
4024 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
4025 entity->base.source_position = token.source_position;
4026 entity->base.namespc = NAMESPACE_NORMAL;
4027 entity->base.symbol = token.v.symbol;
4028 /* a K&R parameter has no type, yet */
4031 append_entity(scope, entity);
4033 if (token.type != ',') {
4037 } while (token.type == T_IDENTIFIER);
4040 static entity_t *parse_parameter(void)
4042 declaration_specifiers_t specifiers;
4043 memset(&specifiers, 0, sizeof(specifiers));
4045 parse_declaration_specifiers(&specifiers);
4047 entity_t *entity = parse_declarator(&specifiers,
4048 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4049 anonymous_entity = NULL;
4053 static void semantic_parameter_incomplete(const entity_t *entity)
4055 assert(entity->kind == ENTITY_PARAMETER);
4057 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
4058 * list in a function declarator that is part of a
4059 * definition of that function shall not have
4060 * incomplete type. */
4061 type_t *type = skip_typeref(entity->declaration.type);
4062 if (is_type_incomplete(type)) {
4063 errorf(&entity->base.source_position,
4064 "parameter '%Y' has incomplete type %T", entity->base.symbol,
4065 entity->declaration.type);
4070 * Parses function type parameters (and optionally creates variable_t entities
4071 * for them in a scope)
4073 static void parse_parameters(function_type_t *type, scope_t *scope)
4076 add_anchor_token(')');
4077 int saved_comma_state = save_and_reset_anchor_state(',');
4079 if (token.type == T_IDENTIFIER &&
4080 !is_typedef_symbol(token.v.symbol)) {
4081 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4082 if (la1_type == ',' || la1_type == ')') {
4083 type->kr_style_parameters = true;
4084 parse_identifier_list(scope);
4085 goto parameters_finished;
4089 if (token.type == ')') {
4090 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4091 if (!(c_mode & _CXX))
4092 type->unspecified_parameters = true;
4093 goto parameters_finished;
4096 function_parameter_t *parameter;
4097 function_parameter_t *last_parameter = NULL;
4100 switch (token.type) {
4103 type->variadic = true;
4104 goto parameters_finished;
4107 case T___extension__:
4110 entity_t *entity = parse_parameter();
4111 if (entity->kind == ENTITY_TYPEDEF) {
4112 errorf(&entity->base.source_position,
4113 "typedef not allowed as function parameter");
4116 assert(is_declaration(entity));
4118 /* func(void) is not a parameter */
4119 if (last_parameter == NULL
4120 && token.type == ')'
4121 && entity->base.symbol == NULL
4122 && skip_typeref(entity->declaration.type) == type_void) {
4123 goto parameters_finished;
4125 semantic_parameter_incomplete(entity);
4127 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4128 memset(parameter, 0, sizeof(parameter[0]));
4129 parameter->type = entity->declaration.type;
4131 if (scope != NULL) {
4132 append_entity(scope, entity);
4135 if (last_parameter != NULL) {
4136 last_parameter->next = parameter;
4138 type->parameters = parameter;
4140 last_parameter = parameter;
4145 goto parameters_finished;
4147 if (token.type != ',') {
4148 goto parameters_finished;
4154 parameters_finished:
4155 rem_anchor_token(')');
4159 restore_anchor_state(',', saved_comma_state);
4162 typedef enum construct_type_kind_t {
4165 CONSTRUCT_REFERENCE,
4168 } construct_type_kind_t;
4170 typedef struct construct_type_t construct_type_t;
4171 struct construct_type_t {
4172 construct_type_kind_t kind;
4173 construct_type_t *next;
4176 typedef struct parsed_pointer_t parsed_pointer_t;
4177 struct parsed_pointer_t {
4178 construct_type_t construct_type;
4179 type_qualifiers_t type_qualifiers;
4180 variable_t *base_variable; /**< MS __based extension. */
4183 typedef struct parsed_reference_t parsed_reference_t;
4184 struct parsed_reference_t {
4185 construct_type_t construct_type;
4188 typedef struct construct_function_type_t construct_function_type_t;
4189 struct construct_function_type_t {
4190 construct_type_t construct_type;
4191 type_t *function_type;
4194 typedef struct parsed_array_t parsed_array_t;
4195 struct parsed_array_t {
4196 construct_type_t construct_type;
4197 type_qualifiers_t type_qualifiers;
4203 typedef struct construct_base_type_t construct_base_type_t;
4204 struct construct_base_type_t {
4205 construct_type_t construct_type;
4209 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4213 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4214 memset(pointer, 0, sizeof(pointer[0]));
4215 pointer->construct_type.kind = CONSTRUCT_POINTER;
4216 pointer->type_qualifiers = parse_type_qualifiers();
4217 pointer->base_variable = base_variable;
4219 return &pointer->construct_type;
4222 static construct_type_t *parse_reference_declarator(void)
4226 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4227 memset(reference, 0, sizeof(reference[0]));
4228 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4230 return (construct_type_t*)reference;
4233 static construct_type_t *parse_array_declarator(void)
4236 add_anchor_token(']');
4238 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4239 memset(array, 0, sizeof(array[0]));
4240 array->construct_type.kind = CONSTRUCT_ARRAY;
4242 if (token.type == T_static) {
4243 array->is_static = true;
4247 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4248 if (type_qualifiers != 0) {
4249 if (token.type == T_static) {
4250 array->is_static = true;
4254 array->type_qualifiers = type_qualifiers;
4256 if (token.type == '*' && look_ahead(1)->type == ']') {
4257 array->is_variable = true;
4259 } else if (token.type != ']') {
4260 array->size = parse_assignment_expression();
4263 rem_anchor_token(']');
4267 return &array->construct_type;
4270 static construct_type_t *parse_function_declarator(scope_t *scope,
4271 decl_modifiers_t modifiers)
4273 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4274 function_type_t *ftype = &type->function;
4276 ftype->linkage = current_linkage;
4278 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4279 case DM_NONE: break;
4280 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4281 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4282 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4283 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4286 errorf(HERE, "multiple calling conventions in declaration");
4290 parse_parameters(ftype, scope);
4292 construct_function_type_t *construct_function_type =
4293 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4294 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4295 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4296 construct_function_type->function_type = type;
4298 return &construct_function_type->construct_type;
4301 typedef struct parse_declarator_env_t {
4302 decl_modifiers_t modifiers;
4304 source_position_t source_position;
4306 } parse_declarator_env_t;
4308 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4309 bool may_be_abstract)
4311 /* construct a single linked list of construct_type_t's which describe
4312 * how to construct the final declarator type */
4313 construct_type_t *first = NULL;
4314 construct_type_t *last = NULL;
4315 gnu_attribute_t *attributes = NULL;
4317 decl_modifiers_t modifiers = parse_attributes(&attributes);
4319 /* MS __based extension */
4320 based_spec_t base_spec;
4321 base_spec.base_variable = NULL;
4324 construct_type_t *type;
4325 switch (token.type) {
4327 if (!(c_mode & _CXX))
4328 errorf(HERE, "references are only available for C++");
4329 if (base_spec.base_variable != NULL && warning.other) {
4330 warningf(&base_spec.source_position,
4331 "__based does not precede a pointer operator, ignored");
4333 type = parse_reference_declarator();
4335 base_spec.base_variable = NULL;
4339 type = parse_pointer_declarator(base_spec.base_variable);
4341 base_spec.base_variable = NULL;
4347 add_anchor_token(')');
4348 parse_microsoft_based(&base_spec);
4349 rem_anchor_token(')');
4354 goto ptr_operator_end;
4365 /* TODO: find out if this is correct */
4366 modifiers |= parse_attributes(&attributes);
4369 if (base_spec.base_variable != NULL && warning.other) {
4370 warningf(&base_spec.source_position,
4371 "__based does not precede a pointer operator, ignored");
4375 modifiers |= env->modifiers;
4376 env->modifiers = modifiers;
4379 construct_type_t *inner_types = NULL;
4381 switch (token.type) {
4384 errorf(HERE, "no identifier expected in typename");
4386 env->symbol = token.v.symbol;
4387 env->source_position = token.source_position;
4393 add_anchor_token(')');
4394 inner_types = parse_inner_declarator(env, may_be_abstract);
4395 if (inner_types != NULL) {
4396 /* All later declarators only modify the return type */
4399 rem_anchor_token(')');
4403 if (may_be_abstract)
4405 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4410 construct_type_t *p = last;
4413 construct_type_t *type;
4414 switch (token.type) {
4416 scope_t *scope = NULL;
4418 scope = &env->parameters;
4420 type = parse_function_declarator(scope, modifiers);
4424 type = parse_array_declarator();
4427 goto declarator_finished;
4430 /* insert in the middle of the list (behind p) */
4432 type->next = p->next;
4443 declarator_finished:
4444 /* append inner_types at the end of the list, we don't to set last anymore
4445 * as it's not needed anymore */
4447 assert(first == NULL);
4448 first = inner_types;
4450 last->next = inner_types;
4458 static void parse_declaration_attributes(entity_t *entity)
4460 gnu_attribute_t *attributes = NULL;
4461 decl_modifiers_t modifiers = parse_attributes(&attributes);
4467 if (entity->kind == ENTITY_TYPEDEF) {
4468 modifiers |= entity->typedefe.modifiers;
4469 type = entity->typedefe.type;
4471 assert(is_declaration(entity));
4472 modifiers |= entity->declaration.modifiers;
4473 type = entity->declaration.type;
4478 /* handle these strange/stupid mode attributes */
4479 gnu_attribute_t *attribute = attributes;
4480 for ( ; attribute != NULL; attribute = attribute->next) {
4481 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4484 atomic_type_kind_t akind = attribute->u.akind;
4485 if (!is_type_signed(type)) {
4487 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4488 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4489 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4490 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4492 panic("invalid akind in mode attribute");
4496 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break;
4497 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break;
4498 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break;
4499 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break;
4501 panic("invalid akind in mode attribute");
4505 type = make_atomic_type(akind, type->base.qualifiers);
4508 type_modifiers_t type_modifiers = type->base.modifiers;
4509 if (modifiers & DM_TRANSPARENT_UNION)
4510 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4512 if (type->base.modifiers != type_modifiers) {
4513 type_t *copy = duplicate_type(type);
4514 copy->base.modifiers = type_modifiers;
4516 type = typehash_insert(copy);
4518 obstack_free(type_obst, copy);
4522 if (entity->kind == ENTITY_TYPEDEF) {
4523 entity->typedefe.type = type;
4524 entity->typedefe.modifiers = modifiers;
4526 entity->declaration.type = type;
4527 entity->declaration.modifiers = modifiers;
4531 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4533 construct_type_t *iter = construct_list;
4534 for (; iter != NULL; iter = iter->next) {
4535 switch (iter->kind) {
4536 case CONSTRUCT_INVALID:
4537 internal_errorf(HERE, "invalid type construction found");
4538 case CONSTRUCT_FUNCTION: {
4539 construct_function_type_t *construct_function_type
4540 = (construct_function_type_t*) iter;
4542 type_t *function_type = construct_function_type->function_type;
4544 function_type->function.return_type = type;
4546 type_t *skipped_return_type = skip_typeref(type);
4548 if (is_type_function(skipped_return_type)) {
4549 errorf(HERE, "function returning function is not allowed");
4550 } else if (is_type_array(skipped_return_type)) {
4551 errorf(HERE, "function returning array is not allowed");
4553 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4555 "type qualifiers in return type of function type are meaningless");
4559 type = function_type;
4563 case CONSTRUCT_POINTER: {
4564 if (is_type_reference(skip_typeref(type)))
4565 errorf(HERE, "cannot declare a pointer to reference");
4567 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4568 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4572 case CONSTRUCT_REFERENCE:
4573 if (is_type_reference(skip_typeref(type)))
4574 errorf(HERE, "cannot declare a reference to reference");
4576 type = make_reference_type(type);
4579 case CONSTRUCT_ARRAY: {
4580 if (is_type_reference(skip_typeref(type)))
4581 errorf(HERE, "cannot declare an array of references");
4583 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4584 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4586 expression_t *size_expression = parsed_array->size;
4587 if (size_expression != NULL) {
4589 = create_implicit_cast(size_expression, type_size_t);
4592 array_type->base.qualifiers = parsed_array->type_qualifiers;
4593 array_type->array.element_type = type;
4594 array_type->array.is_static = parsed_array->is_static;
4595 array_type->array.is_variable = parsed_array->is_variable;
4596 array_type->array.size_expression = size_expression;
4598 if (size_expression != NULL) {
4599 if (is_constant_expression(size_expression)) {
4600 array_type->array.size_constant = true;
4601 array_type->array.size
4602 = fold_constant(size_expression);
4604 array_type->array.is_vla = true;
4608 type_t *skipped_type = skip_typeref(type);
4610 if (is_type_incomplete(skipped_type)) {
4611 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4612 } else if (is_type_function(skipped_type)) {
4613 errorf(HERE, "array of functions is not allowed");
4620 type_t *hashed_type = typehash_insert(type);
4621 if (hashed_type != type) {
4622 /* the function type was constructed earlier freeing it here will
4623 * destroy other types... */
4624 if (iter->kind != CONSTRUCT_FUNCTION) {
4634 static type_t *automatic_type_conversion(type_t *orig_type);
4636 static type_t *semantic_parameter(const source_position_t *pos,
4638 const declaration_specifiers_t *specifiers,
4641 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4642 * shall be adjusted to ``qualified pointer to type'',
4644 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4645 * type'' shall be adjusted to ``pointer to function
4646 * returning type'', as in 6.3.2.1. */
4647 type = automatic_type_conversion(type);
4649 if (specifiers->is_inline && is_type_valid(type)) {
4650 errorf(pos, "parameter '%Y' declared 'inline'", symbol);
4653 /* §6.9.1:6 The declarations in the declaration list shall contain
4654 * no storage-class specifier other than register and no
4655 * initializations. */
4656 if (specifiers->thread_local || (
4657 specifiers->storage_class != STORAGE_CLASS_NONE &&
4658 specifiers->storage_class != STORAGE_CLASS_REGISTER)
4660 errorf(pos, "invalid storage class for parameter '%Y'", symbol);
4663 /* delay test for incomplete type, because we might have (void)
4664 * which is legal but incomplete... */
4669 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4670 declarator_flags_t flags)
4672 parse_declarator_env_t env;
4673 memset(&env, 0, sizeof(env));
4674 env.modifiers = specifiers->modifiers;
4676 construct_type_t *construct_type =
4677 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4679 construct_declarator_type(construct_type, specifiers->type);
4680 type_t *type = skip_typeref(orig_type);
4682 if (construct_type != NULL) {
4683 obstack_free(&temp_obst, construct_type);
4687 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4688 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4689 entity->base.symbol = env.symbol;
4690 entity->base.source_position = env.source_position;
4691 entity->typedefe.type = orig_type;
4693 if (anonymous_entity != NULL) {
4694 if (is_type_compound(type)) {
4695 assert(anonymous_entity->compound.alias == NULL);
4696 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4697 anonymous_entity->kind == ENTITY_UNION);
4698 anonymous_entity->compound.alias = entity;
4699 anonymous_entity = NULL;
4700 } else if (is_type_enum(type)) {
4701 assert(anonymous_entity->enume.alias == NULL);
4702 assert(anonymous_entity->kind == ENTITY_ENUM);
4703 anonymous_entity->enume.alias = entity;
4704 anonymous_entity = NULL;
4708 /* create a declaration type entity */
4709 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4710 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4712 if (specifiers->is_inline && is_type_valid(type)) {
4713 errorf(&env.source_position,
4714 "compound member '%Y' declared 'inline'", env.symbol);
4717 if (specifiers->thread_local ||
4718 specifiers->storage_class != STORAGE_CLASS_NONE) {
4719 errorf(&env.source_position,
4720 "compound member '%Y' must have no storage class",
4723 } else if (flags & DECL_IS_PARAMETER) {
4724 orig_type = semantic_parameter(&env.source_position, type,
4725 specifiers, env.symbol);
4727 entity = allocate_entity_zero(ENTITY_PARAMETER);
4728 } else if (is_type_function(type)) {
4729 entity = allocate_entity_zero(ENTITY_FUNCTION);
4731 entity->function.is_inline = specifiers->is_inline;
4732 entity->function.parameters = env.parameters;
4734 if (specifiers->thread_local || (
4735 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4736 specifiers->storage_class != STORAGE_CLASS_NONE &&
4737 specifiers->storage_class != STORAGE_CLASS_STATIC)
4739 errorf(&env.source_position,
4740 "invalid storage class for function '%Y'", env.symbol);
4743 entity = allocate_entity_zero(ENTITY_VARIABLE);
4745 entity->variable.get_property_sym = specifiers->get_property_sym;
4746 entity->variable.put_property_sym = specifiers->put_property_sym;
4747 if (specifiers->alignment != 0) {
4748 /* TODO: add checks here */
4749 entity->variable.alignment = specifiers->alignment;
4752 if (specifiers->is_inline && is_type_valid(type)) {
4753 errorf(&env.source_position,
4754 "variable '%Y' declared 'inline'", env.symbol);
4757 entity->variable.thread_local = specifiers->thread_local;
4759 bool invalid_storage_class = false;
4760 if (current_scope == file_scope) {
4761 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4762 specifiers->storage_class != STORAGE_CLASS_NONE &&
4763 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4764 invalid_storage_class = true;
4767 if (specifiers->thread_local &&
4768 specifiers->storage_class == STORAGE_CLASS_NONE) {
4769 invalid_storage_class = true;
4772 if (invalid_storage_class) {
4773 errorf(&env.source_position,
4774 "invalid storage class for variable '%Y'", env.symbol);
4778 entity->base.source_position = env.source_position;
4779 entity->base.symbol = env.symbol;
4780 entity->base.namespc = NAMESPACE_NORMAL;
4781 entity->declaration.type = orig_type;
4782 entity->declaration.modifiers = env.modifiers;
4783 entity->declaration.deprecated_string = specifiers->deprecated_string;
4785 storage_class_t storage_class = specifiers->storage_class;
4786 entity->declaration.declared_storage_class = storage_class;
4788 if (storage_class == STORAGE_CLASS_NONE && current_scope != file_scope)
4789 storage_class = STORAGE_CLASS_AUTO;
4790 entity->declaration.storage_class = storage_class;
4793 parse_declaration_attributes(entity);
4798 static type_t *parse_abstract_declarator(type_t *base_type)
4800 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4802 type_t *result = construct_declarator_type(construct_type, base_type);
4803 if (construct_type != NULL) {
4804 obstack_free(&temp_obst, construct_type);
4811 * Check if the declaration of main is suspicious. main should be a
4812 * function with external linkage, returning int, taking either zero
4813 * arguments, two, or three arguments of appropriate types, ie.
4815 * int main([ int argc, char **argv [, char **env ] ]).
4817 * @param decl the declaration to check
4818 * @param type the function type of the declaration
4820 static void check_type_of_main(const entity_t *entity)
4822 const source_position_t *pos = &entity->base.source_position;
4823 if (entity->kind != ENTITY_FUNCTION) {
4824 warningf(pos, "'main' is not a function");
4828 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4829 warningf(pos, "'main' is normally a non-static function");
4832 type_t *type = skip_typeref(entity->declaration.type);
4833 assert(is_type_function(type));
4835 function_type_t *func_type = &type->function;
4836 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4837 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4838 func_type->return_type);
4840 const function_parameter_t *parm = func_type->parameters;
4842 type_t *const first_type = parm->type;
4843 if (!types_compatible(skip_typeref(first_type), type_int)) {
4845 "first argument of 'main' should be 'int', but is '%T'",
4850 type_t *const second_type = parm->type;
4851 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4852 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4856 type_t *const third_type = parm->type;
4857 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4858 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4862 goto warn_arg_count;
4866 warningf(pos, "'main' takes only zero, two or three arguments");
4872 * Check if a symbol is the equal to "main".
4874 static bool is_sym_main(const symbol_t *const sym)
4876 return strcmp(sym->string, "main") == 0;
4879 static void error_redefined_as_different_kind(const source_position_t *pos,
4880 const entity_t *old, entity_kind_t new_kind)
4882 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4883 get_entity_kind_name(old->kind), old->base.symbol,
4884 get_entity_kind_name(new_kind), &old->base.source_position);
4888 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4889 * for various problems that occur for multiple definitions
4891 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4893 const symbol_t *const symbol = entity->base.symbol;
4894 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4895 const source_position_t *pos = &entity->base.source_position;
4897 assert(symbol != NULL);
4898 entity_t *previous_entity = get_entity(symbol, namespc);
4899 /* pushing the same entity twice will break the stack structure */
4900 assert(previous_entity != entity);
4902 if (entity->kind == ENTITY_FUNCTION) {
4903 type_t *const orig_type = entity->declaration.type;
4904 type_t *const type = skip_typeref(orig_type);
4906 assert(is_type_function(type));
4907 if (type->function.unspecified_parameters &&
4908 warning.strict_prototypes &&
4909 previous_entity == NULL) {
4910 warningf(pos, "function declaration '%#T' is not a prototype",
4914 if (warning.main && current_scope == file_scope
4915 && is_sym_main(symbol)) {
4916 check_type_of_main(entity);
4920 if (is_declaration(entity)) {
4921 if (warning.nested_externs
4922 && entity->declaration.storage_class == STORAGE_CLASS_EXTERN
4923 && current_scope != file_scope) {
4924 warningf(pos, "nested extern declaration of '%#T'",
4925 entity->declaration.type, symbol);
4929 if (previous_entity != NULL
4930 && previous_entity->base.parent_scope == ¤t_function->parameters
4931 && current_scope->depth == previous_entity->base.parent_scope->depth+1){
4933 assert(previous_entity->kind == ENTITY_PARAMETER);
4935 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4936 entity->declaration.type, symbol,
4937 previous_entity->declaration.type, symbol,
4938 &previous_entity->base.source_position);
4942 if (previous_entity != NULL
4943 && previous_entity->base.parent_scope == current_scope) {
4945 if (previous_entity->kind != entity->kind) {
4946 error_redefined_as_different_kind(pos, previous_entity,
4950 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
4952 "redeclaration of enum entry '%Y' (declared %P)",
4953 symbol, &previous_entity->base.source_position);
4956 if (previous_entity->kind == ENTITY_TYPEDEF) {
4957 /* TODO: C++ allows this for exactly the same type */
4959 "redefinition of typedef '%Y' (declared %P)",
4960 symbol, &previous_entity->base.source_position);
4964 /* at this point we should have only VARIABLES or FUNCTIONS */
4965 assert(is_declaration(previous_entity) && is_declaration(entity));
4967 /* can happen for K&R style declarations */
4968 if (previous_entity->kind == ENTITY_PARAMETER
4969 && previous_entity->declaration.type == NULL
4970 && entity->kind == ENTITY_PARAMETER) {
4971 previous_entity->declaration.type = entity->declaration.type;
4972 previous_entity->declaration.storage_class
4973 = entity->declaration.storage_class;
4974 previous_entity->declaration.declared_storage_class
4975 = entity->declaration.declared_storage_class;
4976 previous_entity->declaration.modifiers
4977 = entity->declaration.modifiers;
4978 previous_entity->declaration.deprecated_string
4979 = entity->declaration.deprecated_string;
4980 return previous_entity;
4982 assert(entity->declaration.type != NULL);
4984 declaration_t *const previous_declaration
4985 = &previous_entity->declaration;
4986 declaration_t *const declaration = &entity->declaration;
4987 type_t *const orig_type = entity->declaration.type;
4988 type_t *const type = skip_typeref(orig_type);
4990 type_t *prev_type = skip_typeref(previous_declaration->type);
4992 if (!types_compatible(type, prev_type)) {
4994 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4995 orig_type, symbol, previous_declaration->type, symbol,
4996 &previous_entity->base.source_position);
4998 unsigned old_storage_class = previous_declaration->storage_class;
4999 if (warning.redundant_decls && is_definition
5000 && previous_declaration->storage_class == STORAGE_CLASS_STATIC
5001 && !(previous_declaration->modifiers & DM_USED)
5002 && !previous_declaration->used) {
5003 warningf(&previous_entity->base.source_position,
5004 "unnecessary static forward declaration for '%#T'",
5005 previous_declaration->type, symbol);
5008 unsigned new_storage_class = declaration->storage_class;
5009 if (is_type_incomplete(prev_type)) {
5010 previous_declaration->type = type;
5014 /* pretend no storage class means extern for function
5015 * declarations (except if the previous declaration is neither
5016 * none nor extern) */
5017 if (entity->kind == ENTITY_FUNCTION) {
5018 if (prev_type->function.unspecified_parameters) {
5019 previous_declaration->type = type;
5023 switch (old_storage_class) {
5024 case STORAGE_CLASS_NONE:
5025 old_storage_class = STORAGE_CLASS_EXTERN;
5028 case STORAGE_CLASS_EXTERN:
5029 if (is_definition) {
5030 if (warning.missing_prototypes &&
5031 prev_type->function.unspecified_parameters &&
5032 !is_sym_main(symbol)) {
5033 warningf(pos, "no previous prototype for '%#T'",
5036 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5037 new_storage_class = STORAGE_CLASS_EXTERN;
5046 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5047 new_storage_class == STORAGE_CLASS_EXTERN) {
5048 warn_redundant_declaration:
5049 if (!is_definition &&
5050 warning.redundant_decls &&
5051 is_type_valid(prev_type) &&
5052 strcmp(previous_entity->base.source_position.input_name,
5053 "<builtin>") != 0) {
5055 "redundant declaration for '%Y' (declared %P)",
5056 symbol, &previous_entity->base.source_position);
5058 } else if (current_function == NULL) {
5059 if (old_storage_class != STORAGE_CLASS_STATIC &&
5060 new_storage_class == STORAGE_CLASS_STATIC) {
5062 "static declaration of '%Y' follows non-static declaration (declared %P)",
5063 symbol, &previous_entity->base.source_position);
5064 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5065 previous_declaration->storage_class = STORAGE_CLASS_NONE;
5066 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
5068 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5070 goto error_redeclaration;
5071 goto warn_redundant_declaration;
5073 } else if (is_type_valid(prev_type)) {
5074 if (old_storage_class == new_storage_class) {
5075 error_redeclaration:
5076 errorf(pos, "redeclaration of '%Y' (declared %P)",
5077 symbol, &previous_entity->base.source_position);
5080 "redeclaration of '%Y' with different linkage (declared %P)",
5081 symbol, &previous_entity->base.source_position);
5086 previous_declaration->modifiers |= declaration->modifiers;
5087 if (entity->kind == ENTITY_FUNCTION) {
5088 previous_entity->function.is_inline |= entity->function.is_inline;
5090 return previous_entity;
5093 if (entity->kind == ENTITY_FUNCTION) {
5094 if (is_definition &&
5095 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5096 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5097 warningf(pos, "no previous prototype for '%#T'",
5098 entity->declaration.type, symbol);
5099 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5100 warningf(pos, "no previous declaration for '%#T'",
5101 entity->declaration.type, symbol);
5104 } else if (warning.missing_declarations
5105 && entity->kind == ENTITY_VARIABLE
5106 && current_scope == file_scope) {
5107 declaration_t *declaration = &entity->declaration;
5108 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5109 warningf(pos, "no previous declaration for '%#T'",
5110 declaration->type, symbol);
5115 assert(entity->base.parent_scope == NULL);
5116 assert(current_scope != NULL);
5118 entity->base.parent_scope = current_scope;
5119 entity->base.namespc = NAMESPACE_NORMAL;
5120 environment_push(entity);
5121 append_entity(current_scope, entity);
5126 static void parser_error_multiple_definition(entity_t *entity,
5127 const source_position_t *source_position)
5129 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
5130 entity->base.symbol, &entity->base.source_position);
5133 static bool is_declaration_specifier(const token_t *token,
5134 bool only_specifiers_qualifiers)
5136 switch (token->type) {
5141 return is_typedef_symbol(token->v.symbol);
5143 case T___extension__:
5145 return !only_specifiers_qualifiers;
5152 static void parse_init_declarator_rest(entity_t *entity)
5154 assert(is_declaration(entity));
5155 declaration_t *const declaration = &entity->declaration;
5159 type_t *orig_type = declaration->type;
5160 type_t *type = skip_typeref(orig_type);
5162 if (entity->kind == ENTITY_VARIABLE
5163 && entity->variable.initializer != NULL) {
5164 parser_error_multiple_definition(entity, HERE);
5167 bool must_be_constant = false;
5168 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5169 entity->base.parent_scope == file_scope) {
5170 must_be_constant = true;
5173 if (is_type_function(type)) {
5174 errorf(&entity->base.source_position,
5175 "function '%#T' is initialized like a variable",
5176 orig_type, entity->base.symbol);
5177 orig_type = type_error_type;
5180 parse_initializer_env_t env;
5181 env.type = orig_type;
5182 env.must_be_constant = must_be_constant;
5183 env.entity = entity;
5184 current_init_decl = entity;
5186 initializer_t *initializer = parse_initializer(&env);
5187 current_init_decl = NULL;
5189 if (entity->kind == ENTITY_VARIABLE) {
5190 /* § 6.7.5 (22) array initializers for arrays with unknown size
5191 * determine the array type size */
5192 declaration->type = env.type;
5193 entity->variable.initializer = initializer;
5197 /* parse rest of a declaration without any declarator */
5198 static void parse_anonymous_declaration_rest(
5199 const declaration_specifiers_t *specifiers)
5202 anonymous_entity = NULL;
5204 if (warning.other) {
5205 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5206 specifiers->thread_local) {
5207 warningf(&specifiers->source_position,
5208 "useless storage class in empty declaration");
5211 type_t *type = specifiers->type;
5212 switch (type->kind) {
5213 case TYPE_COMPOUND_STRUCT:
5214 case TYPE_COMPOUND_UNION: {
5215 if (type->compound.compound->base.symbol == NULL) {
5216 warningf(&specifiers->source_position,
5217 "unnamed struct/union that defines no instances");
5226 warningf(&specifiers->source_position, "empty declaration");
5232 static void check_variable_type_complete(entity_t *ent)
5234 if (ent->kind != ENTITY_VARIABLE)
5237 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5238 * type for the object shall be complete [...] */
5239 declaration_t *decl = &ent->declaration;
5240 if (decl->storage_class != STORAGE_CLASS_NONE)
5243 type_t *type = decl->type;
5244 if (!is_type_incomplete(skip_typeref(type)))
5247 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5248 type, ent->base.symbol);
5252 static void parse_declaration_rest(entity_t *ndeclaration,
5253 const declaration_specifiers_t *specifiers,
5254 parsed_declaration_func finished_declaration,
5255 declarator_flags_t flags)
5257 add_anchor_token(';');
5258 add_anchor_token(',');
5260 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5262 if (token.type == '=') {
5263 parse_init_declarator_rest(entity);
5264 } else if (entity->kind == ENTITY_VARIABLE) {
5265 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5266 * [...] where the extern specifier is explicitly used. */
5267 declaration_t *decl = &entity->declaration;
5268 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5269 type_t *type = decl->type;
5270 if (is_type_reference(skip_typeref(type))) {
5271 errorf(&entity->base.source_position,
5272 "reference '%#T' must be initialized",
5273 type, entity->base.symbol);
5278 check_variable_type_complete(entity);
5280 if (token.type != ',')
5284 add_anchor_token('=');
5285 ndeclaration = parse_declarator(specifiers, flags);
5286 rem_anchor_token('=');
5291 anonymous_entity = NULL;
5292 rem_anchor_token(';');
5293 rem_anchor_token(',');
5296 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5298 symbol_t *symbol = entity->base.symbol;
5299 if (symbol == NULL) {
5300 errorf(HERE, "anonymous declaration not valid as function parameter");
5304 assert(entity->base.namespc == NAMESPACE_NORMAL);
5305 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5306 if (previous_entity == NULL
5307 || previous_entity->base.parent_scope != current_scope) {
5308 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5313 if (is_definition) {
5314 errorf(HERE, "parameter %Y is initialised", entity->base.symbol);
5317 return record_entity(entity, false);
5320 static void parse_declaration(parsed_declaration_func finished_declaration,
5321 declarator_flags_t flags)
5323 declaration_specifiers_t specifiers;
5324 memset(&specifiers, 0, sizeof(specifiers));
5326 add_anchor_token(';');
5327 parse_declaration_specifiers(&specifiers);
5328 rem_anchor_token(';');
5330 if (token.type == ';') {
5331 parse_anonymous_declaration_rest(&specifiers);
5333 entity_t *entity = parse_declarator(&specifiers, flags);
5334 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5338 static type_t *get_default_promoted_type(type_t *orig_type)
5340 type_t *result = orig_type;
5342 type_t *type = skip_typeref(orig_type);
5343 if (is_type_integer(type)) {
5344 result = promote_integer(type);
5345 } else if (type == type_float) {
5346 result = type_double;
5352 static void parse_kr_declaration_list(entity_t *entity)
5354 if (entity->kind != ENTITY_FUNCTION)
5357 type_t *type = skip_typeref(entity->declaration.type);
5358 assert(is_type_function(type));
5359 if (!type->function.kr_style_parameters)
5363 add_anchor_token('{');
5365 /* push function parameters */
5366 size_t const top = environment_top();
5367 scope_t *old_scope = scope_push(&entity->function.parameters);
5369 entity_t *parameter = entity->function.parameters.entities;
5370 for ( ; parameter != NULL; parameter = parameter->base.next) {
5371 assert(parameter->base.parent_scope == NULL);
5372 parameter->base.parent_scope = current_scope;
5373 environment_push(parameter);
5376 /* parse declaration list */
5378 switch (token.type) {
5380 case T___extension__:
5381 /* This covers symbols, which are no type, too, and results in
5382 * better error messages. The typical cases are misspelled type
5383 * names and missing includes. */
5385 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5393 /* pop function parameters */
5394 assert(current_scope == &entity->function.parameters);
5395 scope_pop(old_scope);
5396 environment_pop_to(top);
5398 /* update function type */
5399 type_t *new_type = duplicate_type(type);
5401 function_parameter_t *parameters = NULL;
5402 function_parameter_t *last_parameter = NULL;
5404 parameter = entity->function.parameters.entities;
5405 for (; parameter != NULL; parameter = parameter->base.next) {
5406 type_t *parameter_type = parameter->declaration.type;
5407 if (parameter_type == NULL) {
5409 errorf(HERE, "no type specified for function parameter '%Y'",
5410 parameter->base.symbol);
5412 if (warning.implicit_int) {
5413 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5414 parameter->base.symbol);
5416 parameter_type = type_int;
5417 parameter->declaration.type = parameter_type;
5421 semantic_parameter_incomplete(parameter);
5422 parameter_type = parameter->declaration.type;
5425 * we need the default promoted types for the function type
5427 parameter_type = get_default_promoted_type(parameter_type);
5429 function_parameter_t *function_parameter
5430 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5431 memset(function_parameter, 0, sizeof(function_parameter[0]));
5433 function_parameter->type = parameter_type;
5434 if (last_parameter != NULL) {
5435 last_parameter->next = function_parameter;
5437 parameters = function_parameter;
5439 last_parameter = function_parameter;
5442 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5444 new_type->function.parameters = parameters;
5445 new_type->function.unspecified_parameters = true;
5447 type = typehash_insert(new_type);
5448 if (type != new_type) {
5449 obstack_free(type_obst, new_type);
5452 entity->declaration.type = type;
5454 rem_anchor_token('{');
5457 static bool first_err = true;
5460 * When called with first_err set, prints the name of the current function,
5463 static void print_in_function(void)
5467 diagnosticf("%s: In function '%Y':\n",
5468 current_function->base.base.source_position.input_name,
5469 current_function->base.base.symbol);
5474 * Check if all labels are defined in the current function.
5475 * Check if all labels are used in the current function.
5477 static void check_labels(void)
5479 for (const goto_statement_t *goto_statement = goto_first;
5480 goto_statement != NULL;
5481 goto_statement = goto_statement->next) {
5482 /* skip computed gotos */
5483 if (goto_statement->expression != NULL)
5486 label_t *label = goto_statement->label;
5489 if (label->base.source_position.input_name == NULL) {
5490 print_in_function();
5491 errorf(&goto_statement->base.source_position,
5492 "label '%Y' used but not defined", label->base.symbol);
5496 if (warning.unused_label) {
5497 for (const label_statement_t *label_statement = label_first;
5498 label_statement != NULL;
5499 label_statement = label_statement->next) {
5500 label_t *label = label_statement->label;
5502 if (! label->used) {
5503 print_in_function();
5504 warningf(&label_statement->base.source_position,
5505 "label '%Y' defined but not used", label->base.symbol);
5511 static void warn_unused_entity(entity_t *entity, entity_t *end)
5513 for (; entity != NULL; entity = entity->base.next) {
5514 if (!is_declaration(entity))
5517 declaration_t *declaration = &entity->declaration;
5518 if (declaration->implicit)
5521 if (!declaration->used) {
5522 print_in_function();
5523 const char *what = get_entity_kind_name(entity->kind);
5524 warningf(&entity->base.source_position, "%s '%Y' is unused",
5525 what, entity->base.symbol);
5526 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5527 print_in_function();
5528 const char *what = get_entity_kind_name(entity->kind);
5529 warningf(&entity->base.source_position, "%s '%Y' is never read",
5530 what, entity->base.symbol);
5538 static void check_unused_variables(statement_t *const stmt, void *const env)
5542 switch (stmt->kind) {
5543 case STATEMENT_DECLARATION: {
5544 declaration_statement_t const *const decls = &stmt->declaration;
5545 warn_unused_entity(decls->declarations_begin,
5546 decls->declarations_end);
5551 warn_unused_entity(stmt->fors.scope.entities, NULL);
5560 * Check declarations of current_function for unused entities.
5562 static void check_declarations(void)
5564 if (warning.unused_parameter) {
5565 const scope_t *scope = ¤t_function->parameters;
5567 /* do not issue unused warnings for main */
5568 if (!is_sym_main(current_function->base.base.symbol)) {
5569 warn_unused_entity(scope->entities, NULL);
5572 if (warning.unused_variable) {
5573 walk_statements(current_function->statement, check_unused_variables,
5578 static int determine_truth(expression_t const* const cond)
5581 !is_constant_expression(cond) ? 0 :
5582 fold_constant(cond) != 0 ? 1 :
5586 static void check_reachable(statement_t *);
5588 static bool expression_returns(expression_t const *const expr)
5590 switch (expr->kind) {
5592 expression_t const *const func = expr->call.function;
5593 if (func->kind == EXPR_REFERENCE) {
5594 entity_t *entity = func->reference.entity;
5595 if (entity->kind == ENTITY_FUNCTION
5596 && entity->declaration.modifiers & DM_NORETURN)
5600 if (!expression_returns(func))
5603 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5604 if (!expression_returns(arg->expression))
5611 case EXPR_REFERENCE:
5612 case EXPR_REFERENCE_ENUM_VALUE:
5614 case EXPR_CHARACTER_CONSTANT:
5615 case EXPR_WIDE_CHARACTER_CONSTANT:
5616 case EXPR_STRING_LITERAL:
5617 case EXPR_WIDE_STRING_LITERAL:
5618 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5619 case EXPR_LABEL_ADDRESS:
5620 case EXPR_CLASSIFY_TYPE:
5621 case EXPR_SIZEOF: // TODO handle obscure VLA case
5624 case EXPR_BUILTIN_SYMBOL:
5625 case EXPR_BUILTIN_CONSTANT_P:
5626 case EXPR_BUILTIN_PREFETCH:
5631 case EXPR_STATEMENT:
5632 check_reachable(expr->statement.statement);
5633 // TODO check if statement can be left
5636 case EXPR_CONDITIONAL:
5637 // TODO handle constant expression
5639 if (!expression_returns(expr->conditional.condition))
5642 if (expr->conditional.true_expression != NULL
5643 && expression_returns(expr->conditional.true_expression))
5646 return expression_returns(expr->conditional.false_expression);
5649 return expression_returns(expr->select.compound);
5651 case EXPR_ARRAY_ACCESS:
5653 expression_returns(expr->array_access.array_ref) &&
5654 expression_returns(expr->array_access.index);
5657 return expression_returns(expr->va_starte.ap);
5660 return expression_returns(expr->va_arge.ap);
5662 EXPR_UNARY_CASES_MANDATORY
5663 return expression_returns(expr->unary.value);
5665 case EXPR_UNARY_THROW:
5669 // TODO handle constant lhs of && and ||
5671 expression_returns(expr->binary.left) &&
5672 expression_returns(expr->binary.right);
5678 panic("unhandled expression");
5681 static bool initializer_returns(initializer_t const *const init)
5683 switch (init->kind) {
5684 case INITIALIZER_VALUE:
5685 return expression_returns(init->value.value);
5687 case INITIALIZER_LIST: {
5688 initializer_t * const* i = init->list.initializers;
5689 initializer_t * const* const end = i + init->list.len;
5690 bool returns = true;
5691 for (; i != end; ++i) {
5692 if (!initializer_returns(*i))
5698 case INITIALIZER_STRING:
5699 case INITIALIZER_WIDE_STRING:
5700 case INITIALIZER_DESIGNATOR: // designators have no payload
5703 panic("unhandled initializer");
5706 static bool noreturn_candidate;
5708 static void check_reachable(statement_t *const stmt)
5710 if (stmt->base.reachable)
5712 if (stmt->kind != STATEMENT_DO_WHILE)
5713 stmt->base.reachable = true;
5715 statement_t *last = stmt;
5717 switch (stmt->kind) {
5718 case STATEMENT_INVALID:
5719 case STATEMENT_EMPTY:
5720 case STATEMENT_LOCAL_LABEL:
5722 next = stmt->base.next;
5725 case STATEMENT_DECLARATION: {
5726 declaration_statement_t const *const decl = &stmt->declaration;
5727 entity_t const * ent = decl->declarations_begin;
5728 entity_t const *const last = decl->declarations_end;
5729 for (;; ent = ent->base.next) {
5730 if (ent->kind == ENTITY_VARIABLE &&
5731 ent->variable.initializer != NULL &&
5732 !initializer_returns(ent->variable.initializer)) {
5738 next = stmt->base.next;
5742 case STATEMENT_COMPOUND:
5743 next = stmt->compound.statements;
5746 case STATEMENT_RETURN: {
5747 expression_t const *const val = stmt->returns.value;
5748 if (val == NULL || expression_returns(val))
5749 noreturn_candidate = false;
5753 case STATEMENT_IF: {
5754 if_statement_t const *const ifs = &stmt->ifs;
5755 expression_t const *const cond = ifs->condition;
5757 if (!expression_returns(cond))
5760 int const val = determine_truth(cond);
5763 check_reachable(ifs->true_statement);
5768 if (ifs->false_statement != NULL) {
5769 check_reachable(ifs->false_statement);
5773 next = stmt->base.next;
5777 case STATEMENT_SWITCH: {
5778 switch_statement_t const *const switchs = &stmt->switchs;
5779 expression_t const *const expr = switchs->expression;
5781 if (!expression_returns(expr))
5784 if (is_constant_expression(expr)) {
5785 long const val = fold_constant(expr);
5786 case_label_statement_t * defaults = NULL;
5787 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5788 if (i->expression == NULL) {
5793 if (i->first_case <= val && val <= i->last_case) {
5794 check_reachable((statement_t*)i);
5799 if (defaults != NULL) {
5800 check_reachable((statement_t*)defaults);
5804 bool has_default = false;
5805 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5806 if (i->expression == NULL)
5809 check_reachable((statement_t*)i);
5816 next = stmt->base.next;
5820 case STATEMENT_EXPRESSION: {
5821 /* Check for noreturn function call */
5822 expression_t const *const expr = stmt->expression.expression;
5823 if (!expression_returns(expr))
5826 next = stmt->base.next;
5830 case STATEMENT_CONTINUE: {
5831 statement_t *parent = stmt;
5833 parent = parent->base.parent;
5834 if (parent == NULL) /* continue not within loop */
5838 switch (parent->kind) {
5839 case STATEMENT_WHILE: goto continue_while;
5840 case STATEMENT_DO_WHILE: goto continue_do_while;
5841 case STATEMENT_FOR: goto continue_for;
5848 case STATEMENT_BREAK: {
5849 statement_t *parent = stmt;
5851 parent = parent->base.parent;
5852 if (parent == NULL) /* break not within loop/switch */
5855 switch (parent->kind) {
5856 case STATEMENT_SWITCH:
5857 case STATEMENT_WHILE:
5858 case STATEMENT_DO_WHILE:
5861 next = parent->base.next;
5862 goto found_break_parent;
5871 case STATEMENT_GOTO:
5872 if (stmt->gotos.expression) {
5873 if (!expression_returns(stmt->gotos.expression))
5876 statement_t *parent = stmt->base.parent;
5877 if (parent == NULL) /* top level goto */
5881 next = stmt->gotos.label->statement;
5882 if (next == NULL) /* missing label */
5887 case STATEMENT_LABEL:
5888 next = stmt->label.statement;
5891 case STATEMENT_CASE_LABEL:
5892 next = stmt->case_label.statement;
5895 case STATEMENT_WHILE: {
5896 while_statement_t const *const whiles = &stmt->whiles;
5897 expression_t const *const cond = whiles->condition;
5899 if (!expression_returns(cond))
5902 int const val = determine_truth(cond);
5905 check_reachable(whiles->body);
5910 next = stmt->base.next;
5914 case STATEMENT_DO_WHILE:
5915 next = stmt->do_while.body;
5918 case STATEMENT_FOR: {
5919 for_statement_t *const fors = &stmt->fors;
5921 if (fors->condition_reachable)
5923 fors->condition_reachable = true;
5925 expression_t const *const cond = fors->condition;
5930 } else if (expression_returns(cond)) {
5931 val = determine_truth(cond);
5937 check_reachable(fors->body);
5942 next = stmt->base.next;
5946 case STATEMENT_MS_TRY: {
5947 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5948 check_reachable(ms_try->try_statement);
5949 next = ms_try->final_statement;
5953 case STATEMENT_LEAVE: {
5954 statement_t *parent = stmt;
5956 parent = parent->base.parent;
5957 if (parent == NULL) /* __leave not within __try */
5960 if (parent->kind == STATEMENT_MS_TRY) {
5962 next = parent->ms_try.final_statement;
5970 while (next == NULL) {
5971 next = last->base.parent;
5973 noreturn_candidate = false;
5975 type_t *const type = current_function->base.type;
5976 assert(is_type_function(type));
5977 type_t *const ret = skip_typeref(type->function.return_type);
5978 if (warning.return_type &&
5979 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5980 is_type_valid(ret) &&
5981 !is_sym_main(current_function->base.base.symbol)) {
5982 warningf(&stmt->base.source_position,
5983 "control reaches end of non-void function");
5988 switch (next->kind) {
5989 case STATEMENT_INVALID:
5990 case STATEMENT_EMPTY:
5991 case STATEMENT_DECLARATION:
5992 case STATEMENT_LOCAL_LABEL:
5993 case STATEMENT_EXPRESSION:
5995 case STATEMENT_RETURN:
5996 case STATEMENT_CONTINUE:
5997 case STATEMENT_BREAK:
5998 case STATEMENT_GOTO:
5999 case STATEMENT_LEAVE:
6000 panic("invalid control flow in function");
6002 case STATEMENT_COMPOUND:
6004 case STATEMENT_SWITCH:
6005 case STATEMENT_LABEL:
6006 case STATEMENT_CASE_LABEL:
6008 next = next->base.next;
6011 case STATEMENT_WHILE: {
6013 if (next->base.reachable)
6015 next->base.reachable = true;
6017 while_statement_t const *const whiles = &next->whiles;
6018 expression_t const *const cond = whiles->condition;
6020 if (!expression_returns(cond))
6023 int const val = determine_truth(cond);
6026 check_reachable(whiles->body);
6032 next = next->base.next;
6036 case STATEMENT_DO_WHILE: {
6038 if (next->base.reachable)
6040 next->base.reachable = true;
6042 do_while_statement_t const *const dw = &next->do_while;
6043 expression_t const *const cond = dw->condition;
6045 if (!expression_returns(cond))
6048 int const val = determine_truth(cond);
6051 check_reachable(dw->body);
6057 next = next->base.next;
6061 case STATEMENT_FOR: {
6063 for_statement_t *const fors = &next->fors;
6065 fors->step_reachable = true;
6067 if (fors->condition_reachable)
6069 fors->condition_reachable = true;
6071 expression_t const *const cond = fors->condition;
6076 } else if (expression_returns(cond)) {
6077 val = determine_truth(cond);
6083 check_reachable(fors->body);
6089 next = next->base.next;
6093 case STATEMENT_MS_TRY:
6095 next = next->ms_try.final_statement;
6100 check_reachable(next);
6103 static void check_unreachable(statement_t* const stmt, void *const env)
6107 switch (stmt->kind) {
6108 case STATEMENT_DO_WHILE:
6109 if (!stmt->base.reachable) {
6110 expression_t const *const cond = stmt->do_while.condition;
6111 if (determine_truth(cond) >= 0) {
6112 warningf(&cond->base.source_position,
6113 "condition of do-while-loop is unreachable");
6118 case STATEMENT_FOR: {
6119 for_statement_t const* const fors = &stmt->fors;
6121 // if init and step are unreachable, cond is unreachable, too
6122 if (!stmt->base.reachable && !fors->step_reachable) {
6123 warningf(&stmt->base.source_position, "statement is unreachable");
6125 if (!stmt->base.reachable && fors->initialisation != NULL) {
6126 warningf(&fors->initialisation->base.source_position,
6127 "initialisation of for-statement is unreachable");
6130 if (!fors->condition_reachable && fors->condition != NULL) {
6131 warningf(&fors->condition->base.source_position,
6132 "condition of for-statement is unreachable");
6135 if (!fors->step_reachable && fors->step != NULL) {
6136 warningf(&fors->step->base.source_position,
6137 "step of for-statement is unreachable");
6143 case STATEMENT_COMPOUND:
6144 if (stmt->compound.statements != NULL)
6146 goto warn_unreachable;
6148 case STATEMENT_DECLARATION: {
6149 /* Only warn if there is at least one declarator with an initializer.
6150 * This typically occurs in switch statements. */
6151 declaration_statement_t const *const decl = &stmt->declaration;
6152 entity_t const * ent = decl->declarations_begin;
6153 entity_t const *const last = decl->declarations_end;
6154 for (;; ent = ent->base.next) {
6155 if (ent->kind == ENTITY_VARIABLE &&
6156 ent->variable.initializer != NULL) {
6157 goto warn_unreachable;
6166 if (!stmt->base.reachable)
6167 warningf(&stmt->base.source_position, "statement is unreachable");
6172 static void parse_external_declaration(void)
6174 /* function-definitions and declarations both start with declaration
6176 declaration_specifiers_t specifiers;
6177 memset(&specifiers, 0, sizeof(specifiers));
6179 add_anchor_token(';');
6180 parse_declaration_specifiers(&specifiers);
6181 rem_anchor_token(';');
6183 /* must be a declaration */
6184 if (token.type == ';') {
6185 parse_anonymous_declaration_rest(&specifiers);
6189 add_anchor_token(',');
6190 add_anchor_token('=');
6191 add_anchor_token(';');
6192 add_anchor_token('{');
6194 /* declarator is common to both function-definitions and declarations */
6195 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6197 rem_anchor_token('{');
6198 rem_anchor_token(';');
6199 rem_anchor_token('=');
6200 rem_anchor_token(',');
6202 /* must be a declaration */
6203 switch (token.type) {
6207 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6212 /* must be a function definition */
6213 parse_kr_declaration_list(ndeclaration);
6215 if (token.type != '{') {
6216 parse_error_expected("while parsing function definition", '{', NULL);
6217 eat_until_matching_token(';');
6221 assert(is_declaration(ndeclaration));
6222 type_t *type = skip_typeref(ndeclaration->declaration.type);
6224 if (!is_type_function(type)) {
6225 if (is_type_valid(type)) {
6226 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6227 type, ndeclaration->base.symbol);
6233 if (warning.aggregate_return &&
6234 is_type_compound(skip_typeref(type->function.return_type))) {
6235 warningf(HERE, "function '%Y' returns an aggregate",
6236 ndeclaration->base.symbol);
6238 if (warning.traditional && !type->function.unspecified_parameters) {
6239 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6240 ndeclaration->base.symbol);
6242 if (warning.old_style_definition && type->function.unspecified_parameters) {
6243 warningf(HERE, "old-style function definition '%Y'",
6244 ndeclaration->base.symbol);
6247 /* § 6.7.5.3 (14) a function definition with () means no
6248 * parameters (and not unspecified parameters) */
6249 if (type->function.unspecified_parameters
6250 && type->function.parameters == NULL
6251 && !type->function.kr_style_parameters) {
6252 type_t *duplicate = duplicate_type(type);
6253 duplicate->function.unspecified_parameters = false;
6255 type = typehash_insert(duplicate);
6256 if (type != duplicate) {
6257 obstack_free(type_obst, duplicate);
6259 ndeclaration->declaration.type = type;
6262 entity_t *const entity = record_entity(ndeclaration, true);
6263 assert(entity->kind == ENTITY_FUNCTION);
6264 assert(ndeclaration->kind == ENTITY_FUNCTION);
6266 function_t *function = &entity->function;
6267 if (ndeclaration != entity) {
6268 function->parameters = ndeclaration->function.parameters;
6270 assert(is_declaration(entity));
6271 type = skip_typeref(entity->declaration.type);
6273 /* push function parameters and switch scope */
6274 size_t const top = environment_top();
6275 scope_t *old_scope = scope_push(&function->parameters);
6277 entity_t *parameter = function->parameters.entities;
6278 for (; parameter != NULL; parameter = parameter->base.next) {
6279 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6280 parameter->base.parent_scope = current_scope;
6282 assert(parameter->base.parent_scope == NULL
6283 || parameter->base.parent_scope == current_scope);
6284 parameter->base.parent_scope = current_scope;
6285 if (parameter->base.symbol == NULL) {
6286 errorf(¶meter->base.source_position, "parameter name omitted");
6289 environment_push(parameter);
6292 if (function->statement != NULL) {
6293 parser_error_multiple_definition(entity, HERE);
6296 /* parse function body */
6297 int label_stack_top = label_top();
6298 function_t *old_current_function = current_function;
6299 current_function = function;
6300 current_parent = NULL;
6303 goto_anchor = &goto_first;
6305 label_anchor = &label_first;
6307 statement_t *const body = parse_compound_statement(false);
6308 function->statement = body;
6311 check_declarations();
6312 if (warning.return_type ||
6313 warning.unreachable_code ||
6314 (warning.missing_noreturn
6315 && !(function->base.modifiers & DM_NORETURN))) {
6316 noreturn_candidate = true;
6317 check_reachable(body);
6318 if (warning.unreachable_code)
6319 walk_statements(body, check_unreachable, NULL);
6320 if (warning.missing_noreturn &&
6321 noreturn_candidate &&
6322 !(function->base.modifiers & DM_NORETURN)) {
6323 warningf(&body->base.source_position,
6324 "function '%#T' is candidate for attribute 'noreturn'",
6325 type, entity->base.symbol);
6329 assert(current_parent == NULL);
6330 assert(current_function == function);
6331 current_function = old_current_function;
6332 label_pop_to(label_stack_top);
6335 assert(current_scope == &function->parameters);
6336 scope_pop(old_scope);
6337 environment_pop_to(top);
6340 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6341 source_position_t *source_position,
6342 const symbol_t *symbol)
6344 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6346 type->bitfield.base_type = base_type;
6347 type->bitfield.size_expression = size;
6350 type_t *skipped_type = skip_typeref(base_type);
6351 if (!is_type_integer(skipped_type)) {
6352 errorf(HERE, "bitfield base type '%T' is not an integer type",
6356 bit_size = skipped_type->base.size * 8;
6359 if (is_constant_expression(size)) {
6360 long v = fold_constant(size);
6363 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6364 } else if (v == 0) {
6365 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6366 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6367 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6369 type->bitfield.bit_size = v;
6376 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6378 entity_t *iter = compound->members.entities;
6379 for (; iter != NULL; iter = iter->base.next) {
6380 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6383 if (iter->base.symbol == symbol) {
6385 } else if (iter->base.symbol == NULL) {
6386 type_t *type = skip_typeref(iter->declaration.type);
6387 if (is_type_compound(type)) {
6389 = find_compound_entry(type->compound.compound, symbol);
6400 static void parse_compound_declarators(compound_t *compound,
6401 const declaration_specifiers_t *specifiers)
6406 if (token.type == ':') {
6407 source_position_t source_position = *HERE;
6410 type_t *base_type = specifiers->type;
6411 expression_t *size = parse_constant_expression();
6413 type_t *type = make_bitfield_type(base_type, size,
6414 &source_position, sym_anonymous);
6416 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6417 entity->base.namespc = NAMESPACE_NORMAL;
6418 entity->base.source_position = source_position;
6419 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6420 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6421 entity->declaration.modifiers = specifiers->modifiers;
6422 entity->declaration.type = type;
6424 entity = parse_declarator(specifiers,
6425 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6426 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6428 if (token.type == ':') {
6429 source_position_t source_position = *HERE;
6431 expression_t *size = parse_constant_expression();
6433 type_t *type = entity->declaration.type;
6434 type_t *bitfield_type = make_bitfield_type(type, size,
6435 &source_position, entity->base.symbol);
6436 entity->declaration.type = bitfield_type;
6440 /* make sure we don't define a symbol multiple times */
6441 symbol_t *symbol = entity->base.symbol;
6442 if (symbol != NULL) {
6443 entity_t *prev = find_compound_entry(compound, symbol);
6446 errorf(&entity->base.source_position,
6447 "multiple declarations of symbol '%Y' (declared %P)",
6448 symbol, &prev->base.source_position);
6452 append_entity(&compound->members, entity);
6454 type_t *orig_type = entity->declaration.type;
6455 type_t *type = skip_typeref(orig_type);
6456 if (is_type_function(type)) {
6457 errorf(&entity->base.source_position,
6458 "compound member '%Y' must not have function type '%T'",
6459 entity->base.symbol, orig_type);
6460 } else if (is_type_incomplete(type)) {
6461 /* §6.7.2.1:16 flexible array member */
6462 if (is_type_array(type) &&
6463 token.type == ';' &&
6464 look_ahead(1)->type == '}') {
6465 compound->has_flexible_member = true;
6467 errorf(&entity->base.source_position,
6468 "compound member '%Y' has incomplete type '%T'",
6469 entity->base.symbol, orig_type);
6473 if (token.type != ',')
6480 anonymous_entity = NULL;
6483 static void parse_compound_type_entries(compound_t *compound)
6486 add_anchor_token('}');
6488 while (token.type != '}') {
6489 if (token.type == T_EOF) {
6490 errorf(HERE, "EOF while parsing struct");
6493 declaration_specifiers_t specifiers;
6494 memset(&specifiers, 0, sizeof(specifiers));
6495 parse_declaration_specifiers(&specifiers);
6497 parse_compound_declarators(compound, &specifiers);
6499 rem_anchor_token('}');
6503 compound->complete = true;
6506 static type_t *parse_typename(void)
6508 declaration_specifiers_t specifiers;
6509 memset(&specifiers, 0, sizeof(specifiers));
6510 parse_declaration_specifiers(&specifiers);
6511 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6512 specifiers.thread_local) {
6513 /* TODO: improve error message, user does probably not know what a
6514 * storage class is...
6516 errorf(HERE, "typename may not have a storage class");
6519 type_t *result = parse_abstract_declarator(specifiers.type);
6527 typedef expression_t* (*parse_expression_function)(void);
6528 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6530 typedef struct expression_parser_function_t expression_parser_function_t;
6531 struct expression_parser_function_t {
6532 parse_expression_function parser;
6533 unsigned infix_precedence;
6534 parse_expression_infix_function infix_parser;
6537 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6540 * Prints an error message if an expression was expected but not read
6542 static expression_t *expected_expression_error(void)
6544 /* skip the error message if the error token was read */
6545 if (token.type != T_ERROR) {
6546 errorf(HERE, "expected expression, got token '%K'", &token);
6550 return create_invalid_expression();
6554 * Parse a string constant.
6556 static expression_t *parse_string_const(void)
6559 if (token.type == T_STRING_LITERAL) {
6560 string_t res = token.v.string;
6562 while (token.type == T_STRING_LITERAL) {
6563 res = concat_strings(&res, &token.v.string);
6566 if (token.type != T_WIDE_STRING_LITERAL) {
6567 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6568 /* note: that we use type_char_ptr here, which is already the
6569 * automatic converted type. revert_automatic_type_conversion
6570 * will construct the array type */
6571 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6572 cnst->string.value = res;
6576 wres = concat_string_wide_string(&res, &token.v.wide_string);
6578 wres = token.v.wide_string;
6583 switch (token.type) {
6584 case T_WIDE_STRING_LITERAL:
6585 wres = concat_wide_strings(&wres, &token.v.wide_string);
6588 case T_STRING_LITERAL:
6589 wres = concat_wide_string_string(&wres, &token.v.string);
6593 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6594 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6595 cnst->wide_string.value = wres;
6604 * Parse a boolean constant.
6606 static expression_t *parse_bool_const(bool value)
6608 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6609 cnst->base.type = type_bool;
6610 cnst->conste.v.int_value = value;
6618 * Parse an integer constant.
6620 static expression_t *parse_int_const(void)
6622 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6623 cnst->base.type = token.datatype;
6624 cnst->conste.v.int_value = token.v.intvalue;
6632 * Parse a character constant.
6634 static expression_t *parse_character_constant(void)
6636 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6637 cnst->base.type = token.datatype;
6638 cnst->conste.v.character = token.v.string;
6640 if (cnst->conste.v.character.size != 1) {
6642 errorf(HERE, "more than 1 character in character constant");
6643 } else if (warning.multichar) {
6644 warningf(HERE, "multi-character character constant");
6653 * Parse a wide character constant.
6655 static expression_t *parse_wide_character_constant(void)
6657 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6658 cnst->base.type = token.datatype;
6659 cnst->conste.v.wide_character = token.v.wide_string;
6661 if (cnst->conste.v.wide_character.size != 1) {
6663 errorf(HERE, "more than 1 character in character constant");
6664 } else if (warning.multichar) {
6665 warningf(HERE, "multi-character character constant");
6674 * Parse a float constant.
6676 static expression_t *parse_float_const(void)
6678 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6679 cnst->base.type = token.datatype;
6680 cnst->conste.v.float_value = token.v.floatvalue;
6687 static entity_t *create_implicit_function(symbol_t *symbol,
6688 const source_position_t *source_position)
6690 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6691 ntype->function.return_type = type_int;
6692 ntype->function.unspecified_parameters = true;
6694 type_t *type = typehash_insert(ntype);
6695 if (type != ntype) {
6699 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6700 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6701 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6702 entity->declaration.type = type;
6703 entity->declaration.implicit = true;
6704 entity->base.symbol = symbol;
6705 entity->base.source_position = *source_position;
6707 bool strict_prototypes_old = warning.strict_prototypes;
6708 warning.strict_prototypes = false;
6709 record_entity(entity, false);
6710 warning.strict_prototypes = strict_prototypes_old;
6716 * Creates a return_type (func)(argument_type) function type if not
6719 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6720 type_t *argument_type2)
6722 function_parameter_t *parameter2
6723 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6724 memset(parameter2, 0, sizeof(parameter2[0]));
6725 parameter2->type = argument_type2;
6727 function_parameter_t *parameter1
6728 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6729 memset(parameter1, 0, sizeof(parameter1[0]));
6730 parameter1->type = argument_type1;
6731 parameter1->next = parameter2;
6733 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6734 type->function.return_type = return_type;
6735 type->function.parameters = parameter1;
6737 type_t *result = typehash_insert(type);
6738 if (result != type) {
6746 * Creates a return_type (func)(argument_type) function type if not
6749 * @param return_type the return type
6750 * @param argument_type the argument type
6752 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6754 function_parameter_t *parameter
6755 = obstack_alloc(type_obst, sizeof(parameter[0]));
6756 memset(parameter, 0, sizeof(parameter[0]));
6757 parameter->type = argument_type;
6759 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6760 type->function.return_type = return_type;
6761 type->function.parameters = parameter;
6763 type_t *result = typehash_insert(type);
6764 if (result != type) {
6771 static type_t *make_function_0_type(type_t *return_type)
6773 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6774 type->function.return_type = return_type;
6775 type->function.parameters = NULL;
6777 type_t *result = typehash_insert(type);
6778 if (result != type) {
6786 * Creates a function type for some function like builtins.
6788 * @param symbol the symbol describing the builtin
6790 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6792 switch (symbol->ID) {
6793 case T___builtin_alloca:
6794 return make_function_1_type(type_void_ptr, type_size_t);
6795 case T___builtin_huge_val:
6796 return make_function_0_type(type_double);
6797 case T___builtin_inf:
6798 return make_function_0_type(type_double);
6799 case T___builtin_inff:
6800 return make_function_0_type(type_float);
6801 case T___builtin_infl:
6802 return make_function_0_type(type_long_double);
6803 case T___builtin_nan:
6804 return make_function_1_type(type_double, type_char_ptr);
6805 case T___builtin_nanf:
6806 return make_function_1_type(type_float, type_char_ptr);
6807 case T___builtin_nanl:
6808 return make_function_1_type(type_long_double, type_char_ptr);
6809 case T___builtin_va_end:
6810 return make_function_1_type(type_void, type_valist);
6811 case T___builtin_expect:
6812 return make_function_2_type(type_long, type_long, type_long);
6814 internal_errorf(HERE, "not implemented builtin symbol found");
6819 * Performs automatic type cast as described in § 6.3.2.1.
6821 * @param orig_type the original type
6823 static type_t *automatic_type_conversion(type_t *orig_type)
6825 type_t *type = skip_typeref(orig_type);
6826 if (is_type_array(type)) {
6827 array_type_t *array_type = &type->array;
6828 type_t *element_type = array_type->element_type;
6829 unsigned qualifiers = array_type->base.qualifiers;
6831 return make_pointer_type(element_type, qualifiers);
6834 if (is_type_function(type)) {
6835 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6842 * reverts the automatic casts of array to pointer types and function
6843 * to function-pointer types as defined § 6.3.2.1
6845 type_t *revert_automatic_type_conversion(const expression_t *expression)
6847 switch (expression->kind) {
6848 case EXPR_REFERENCE: {
6849 entity_t *entity = expression->reference.entity;
6850 if (is_declaration(entity)) {
6851 return entity->declaration.type;
6852 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6853 return entity->enum_value.enum_type;
6855 panic("no declaration or enum in reference");
6860 entity_t *entity = expression->select.compound_entry;
6861 assert(is_declaration(entity));
6862 type_t *type = entity->declaration.type;
6863 return get_qualified_type(type,
6864 expression->base.type->base.qualifiers);
6867 case EXPR_UNARY_DEREFERENCE: {
6868 const expression_t *const value = expression->unary.value;
6869 type_t *const type = skip_typeref(value->base.type);
6870 assert(is_type_pointer(type));
6871 return type->pointer.points_to;
6874 case EXPR_BUILTIN_SYMBOL:
6875 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6877 case EXPR_ARRAY_ACCESS: {
6878 const expression_t *array_ref = expression->array_access.array_ref;
6879 type_t *type_left = skip_typeref(array_ref->base.type);
6880 if (!is_type_valid(type_left))
6882 assert(is_type_pointer(type_left));
6883 return type_left->pointer.points_to;
6886 case EXPR_STRING_LITERAL: {
6887 size_t size = expression->string.value.size;
6888 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6891 case EXPR_WIDE_STRING_LITERAL: {
6892 size_t size = expression->wide_string.value.size;
6893 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6896 case EXPR_COMPOUND_LITERAL:
6897 return expression->compound_literal.type;
6902 return expression->base.type;
6905 static expression_t *parse_reference(void)
6907 symbol_t *const symbol = token.v.symbol;
6909 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6911 if (entity == NULL) {
6912 if (!strict_mode && look_ahead(1)->type == '(') {
6913 /* an implicitly declared function */
6914 if (warning.implicit_function_declaration) {
6915 warningf(HERE, "implicit declaration of function '%Y'",
6919 entity = create_implicit_function(symbol, HERE);
6921 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6922 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6928 if (is_declaration(entity)) {
6929 orig_type = entity->declaration.type;
6930 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6931 orig_type = entity->enum_value.enum_type;
6932 } else if (entity->kind == ENTITY_TYPEDEF) {
6933 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
6936 return create_invalid_expression();
6938 panic("expected declaration or enum value in reference");
6941 /* we always do the auto-type conversions; the & and sizeof parser contains
6942 * code to revert this! */
6943 type_t *type = automatic_type_conversion(orig_type);
6945 expression_kind_t kind = EXPR_REFERENCE;
6946 if (entity->kind == ENTITY_ENUM_VALUE)
6947 kind = EXPR_REFERENCE_ENUM_VALUE;
6949 expression_t *expression = allocate_expression_zero(kind);
6950 expression->reference.entity = entity;
6951 expression->base.type = type;
6953 /* this declaration is used */
6954 if (is_declaration(entity)) {
6955 entity->declaration.used = true;
6958 if (entity->base.parent_scope != file_scope
6959 && entity->base.parent_scope->depth < current_function->parameters.depth
6960 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
6961 if (entity->kind == ENTITY_VARIABLE) {
6962 /* access of a variable from an outer function */
6963 entity->variable.address_taken = true;
6964 } else if (entity->kind == ENTITY_PARAMETER) {
6965 entity->parameter.address_taken = true;
6967 current_function->need_closure = true;
6970 /* check for deprecated functions */
6971 if (warning.deprecated_declarations
6972 && is_declaration(entity)
6973 && entity->declaration.modifiers & DM_DEPRECATED) {
6974 declaration_t *declaration = &entity->declaration;
6976 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
6977 "function" : "variable";
6979 if (declaration->deprecated_string != NULL) {
6980 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6981 prefix, entity->base.symbol, &entity->base.source_position,
6982 declaration->deprecated_string);
6984 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6985 entity->base.symbol, &entity->base.source_position);
6989 if (warning.init_self && entity == current_init_decl && !in_type_prop
6990 && entity->kind == ENTITY_VARIABLE) {
6991 current_init_decl = NULL;
6992 warningf(HERE, "variable '%#T' is initialized by itself",
6993 entity->declaration.type, entity->base.symbol);
7000 static bool semantic_cast(expression_t *cast)
7002 expression_t *expression = cast->unary.value;
7003 type_t *orig_dest_type = cast->base.type;
7004 type_t *orig_type_right = expression->base.type;
7005 type_t const *dst_type = skip_typeref(orig_dest_type);
7006 type_t const *src_type = skip_typeref(orig_type_right);
7007 source_position_t const *pos = &cast->base.source_position;
7009 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7010 if (dst_type == type_void)
7013 /* only integer and pointer can be casted to pointer */
7014 if (is_type_pointer(dst_type) &&
7015 !is_type_pointer(src_type) &&
7016 !is_type_integer(src_type) &&
7017 is_type_valid(src_type)) {
7018 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7022 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7023 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7027 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7028 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7032 if (warning.cast_qual &&
7033 is_type_pointer(src_type) &&
7034 is_type_pointer(dst_type)) {
7035 type_t *src = skip_typeref(src_type->pointer.points_to);
7036 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7037 unsigned missing_qualifiers =
7038 src->base.qualifiers & ~dst->base.qualifiers;
7039 if (missing_qualifiers != 0) {
7041 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7042 missing_qualifiers, orig_type_right);
7048 static expression_t *parse_compound_literal(type_t *type)
7050 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7052 parse_initializer_env_t env;
7055 env.must_be_constant = false;
7056 initializer_t *initializer = parse_initializer(&env);
7059 expression->compound_literal.initializer = initializer;
7060 expression->compound_literal.type = type;
7061 expression->base.type = automatic_type_conversion(type);
7067 * Parse a cast expression.
7069 static expression_t *parse_cast(void)
7071 add_anchor_token(')');
7073 source_position_t source_position = token.source_position;
7075 type_t *type = parse_typename();
7077 rem_anchor_token(')');
7080 if (token.type == '{') {
7081 return parse_compound_literal(type);
7084 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7085 cast->base.source_position = source_position;
7087 expression_t *value = parse_sub_expression(PREC_CAST);
7088 cast->base.type = type;
7089 cast->unary.value = value;
7091 if (! semantic_cast(cast)) {
7092 /* TODO: record the error in the AST. else it is impossible to detect it */
7097 return create_invalid_expression();
7101 * Parse a statement expression.
7103 static expression_t *parse_statement_expression(void)
7105 add_anchor_token(')');
7107 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7109 statement_t *statement = parse_compound_statement(true);
7110 expression->statement.statement = statement;
7112 /* find last statement and use its type */
7113 type_t *type = type_void;
7114 const statement_t *stmt = statement->compound.statements;
7116 while (stmt->base.next != NULL)
7117 stmt = stmt->base.next;
7119 if (stmt->kind == STATEMENT_EXPRESSION) {
7120 type = stmt->expression.expression->base.type;
7122 } else if (warning.other) {
7123 warningf(&expression->base.source_position, "empty statement expression ({})");
7125 expression->base.type = type;
7127 rem_anchor_token(')');
7135 * Parse a parenthesized expression.
7137 static expression_t *parse_parenthesized_expression(void)
7141 switch (token.type) {
7143 /* gcc extension: a statement expression */
7144 return parse_statement_expression();
7148 return parse_cast();
7150 if (is_typedef_symbol(token.v.symbol)) {
7151 return parse_cast();
7155 add_anchor_token(')');
7156 expression_t *result = parse_expression();
7157 rem_anchor_token(')');
7164 static expression_t *parse_function_keyword(void)
7168 if (current_function == NULL) {
7169 errorf(HERE, "'__func__' used outside of a function");
7172 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7173 expression->base.type = type_char_ptr;
7174 expression->funcname.kind = FUNCNAME_FUNCTION;
7181 static expression_t *parse_pretty_function_keyword(void)
7183 if (current_function == NULL) {
7184 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7187 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7188 expression->base.type = type_char_ptr;
7189 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7191 eat(T___PRETTY_FUNCTION__);
7196 static expression_t *parse_funcsig_keyword(void)
7198 if (current_function == NULL) {
7199 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7202 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7203 expression->base.type = type_char_ptr;
7204 expression->funcname.kind = FUNCNAME_FUNCSIG;
7211 static expression_t *parse_funcdname_keyword(void)
7213 if (current_function == NULL) {
7214 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7217 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7218 expression->base.type = type_char_ptr;
7219 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7221 eat(T___FUNCDNAME__);
7226 static designator_t *parse_designator(void)
7228 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7229 result->source_position = *HERE;
7231 if (token.type != T_IDENTIFIER) {
7232 parse_error_expected("while parsing member designator",
7233 T_IDENTIFIER, NULL);
7236 result->symbol = token.v.symbol;
7239 designator_t *last_designator = result;
7241 if (token.type == '.') {
7243 if (token.type != T_IDENTIFIER) {
7244 parse_error_expected("while parsing member designator",
7245 T_IDENTIFIER, NULL);
7248 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7249 designator->source_position = *HERE;
7250 designator->symbol = token.v.symbol;
7253 last_designator->next = designator;
7254 last_designator = designator;
7257 if (token.type == '[') {
7259 add_anchor_token(']');
7260 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7261 designator->source_position = *HERE;
7262 designator->array_index = parse_expression();
7263 rem_anchor_token(']');
7265 if (designator->array_index == NULL) {
7269 last_designator->next = designator;
7270 last_designator = designator;
7282 * Parse the __builtin_offsetof() expression.
7284 static expression_t *parse_offsetof(void)
7286 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7287 expression->base.type = type_size_t;
7289 eat(T___builtin_offsetof);
7292 add_anchor_token(',');
7293 type_t *type = parse_typename();
7294 rem_anchor_token(',');
7296 add_anchor_token(')');
7297 designator_t *designator = parse_designator();
7298 rem_anchor_token(')');
7301 expression->offsetofe.type = type;
7302 expression->offsetofe.designator = designator;
7305 memset(&path, 0, sizeof(path));
7306 path.top_type = type;
7307 path.path = NEW_ARR_F(type_path_entry_t, 0);
7309 descend_into_subtype(&path);
7311 if (!walk_designator(&path, designator, true)) {
7312 return create_invalid_expression();
7315 DEL_ARR_F(path.path);
7319 return create_invalid_expression();
7323 * Parses a _builtin_va_start() expression.
7325 static expression_t *parse_va_start(void)
7327 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7329 eat(T___builtin_va_start);
7332 add_anchor_token(',');
7333 expression->va_starte.ap = parse_assignment_expression();
7334 rem_anchor_token(',');
7336 expression_t *const expr = parse_assignment_expression();
7337 if (expr->kind == EXPR_REFERENCE) {
7338 entity_t *const entity = expr->reference.entity;
7339 if (entity->base.parent_scope != ¤t_function->parameters
7340 || entity->base.next != NULL
7341 || entity->kind != ENTITY_PARAMETER) {
7342 errorf(&expr->base.source_position,
7343 "second argument of 'va_start' must be last parameter of the current function");
7345 expression->va_starte.parameter = &entity->variable;
7352 return create_invalid_expression();
7356 * Parses a _builtin_va_arg() expression.
7358 static expression_t *parse_va_arg(void)
7360 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7362 eat(T___builtin_va_arg);
7365 expression->va_arge.ap = parse_assignment_expression();
7367 expression->base.type = parse_typename();
7372 return create_invalid_expression();
7375 static expression_t *parse_builtin_symbol(void)
7377 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7379 symbol_t *symbol = token.v.symbol;
7381 expression->builtin_symbol.symbol = symbol;
7384 type_t *type = get_builtin_symbol_type(symbol);
7385 type = automatic_type_conversion(type);
7387 expression->base.type = type;
7392 * Parses a __builtin_constant() expression.
7394 static expression_t *parse_builtin_constant(void)
7396 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7398 eat(T___builtin_constant_p);
7401 add_anchor_token(')');
7402 expression->builtin_constant.value = parse_assignment_expression();
7403 rem_anchor_token(')');
7405 expression->base.type = type_int;
7409 return create_invalid_expression();
7413 * Parses a __builtin_prefetch() expression.
7415 static expression_t *parse_builtin_prefetch(void)
7417 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7419 eat(T___builtin_prefetch);
7422 add_anchor_token(')');
7423 expression->builtin_prefetch.adr = parse_assignment_expression();
7424 if (token.type == ',') {
7426 expression->builtin_prefetch.rw = parse_assignment_expression();
7428 if (token.type == ',') {
7430 expression->builtin_prefetch.locality = parse_assignment_expression();
7432 rem_anchor_token(')');
7434 expression->base.type = type_void;
7438 return create_invalid_expression();
7442 * Parses a __builtin_is_*() compare expression.
7444 static expression_t *parse_compare_builtin(void)
7446 expression_t *expression;
7448 switch (token.type) {
7449 case T___builtin_isgreater:
7450 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7452 case T___builtin_isgreaterequal:
7453 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7455 case T___builtin_isless:
7456 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7458 case T___builtin_islessequal:
7459 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7461 case T___builtin_islessgreater:
7462 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7464 case T___builtin_isunordered:
7465 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7468 internal_errorf(HERE, "invalid compare builtin found");
7470 expression->base.source_position = *HERE;
7474 expression->binary.left = parse_assignment_expression();
7476 expression->binary.right = parse_assignment_expression();
7479 type_t *const orig_type_left = expression->binary.left->base.type;
7480 type_t *const orig_type_right = expression->binary.right->base.type;
7482 type_t *const type_left = skip_typeref(orig_type_left);
7483 type_t *const type_right = skip_typeref(orig_type_right);
7484 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7485 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7486 type_error_incompatible("invalid operands in comparison",
7487 &expression->base.source_position, orig_type_left, orig_type_right);
7490 semantic_comparison(&expression->binary);
7495 return create_invalid_expression();
7500 * Parses a __builtin_expect() expression.
7502 static expression_t *parse_builtin_expect(void)
7504 expression_t *expression
7505 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7507 eat(T___builtin_expect);
7510 expression->binary.left = parse_assignment_expression();
7512 expression->binary.right = parse_constant_expression();
7515 expression->base.type = expression->binary.left->base.type;
7519 return create_invalid_expression();
7524 * Parses a MS assume() expression.
7526 static expression_t *parse_assume(void)
7528 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7533 add_anchor_token(')');
7534 expression->unary.value = parse_assignment_expression();
7535 rem_anchor_token(')');
7538 expression->base.type = type_void;
7541 return create_invalid_expression();
7545 * Return the declaration for a given label symbol or create a new one.
7547 * @param symbol the symbol of the label
7549 static label_t *get_label(symbol_t *symbol)
7552 assert(current_function != NULL);
7554 label = get_entity(symbol, NAMESPACE_LABEL);
7555 /* if we found a local label, we already created the declaration */
7556 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7557 if (label->base.parent_scope != current_scope) {
7558 assert(label->base.parent_scope->depth < current_scope->depth);
7559 current_function->goto_to_outer = true;
7561 return &label->label;
7564 label = get_entity(symbol, NAMESPACE_LABEL);
7565 /* if we found a label in the same function, then we already created the
7568 && label->base.parent_scope == ¤t_function->parameters) {
7569 return &label->label;
7572 /* otherwise we need to create a new one */
7573 label = allocate_entity_zero(ENTITY_LABEL);
7574 label->base.namespc = NAMESPACE_LABEL;
7575 label->base.symbol = symbol;
7579 return &label->label;
7583 * Parses a GNU && label address expression.
7585 static expression_t *parse_label_address(void)
7587 source_position_t source_position = token.source_position;
7589 if (token.type != T_IDENTIFIER) {
7590 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7593 symbol_t *symbol = token.v.symbol;
7596 label_t *label = get_label(symbol);
7598 label->address_taken = true;
7600 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7601 expression->base.source_position = source_position;
7603 /* label address is threaten as a void pointer */
7604 expression->base.type = type_void_ptr;
7605 expression->label_address.label = label;
7608 return create_invalid_expression();
7612 * Parse a microsoft __noop expression.
7614 static expression_t *parse_noop_expression(void)
7616 /* the result is a (int)0 */
7617 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7618 cnst->base.type = type_int;
7619 cnst->conste.v.int_value = 0;
7620 cnst->conste.is_ms_noop = true;
7624 if (token.type == '(') {
7625 /* parse arguments */
7627 add_anchor_token(')');
7628 add_anchor_token(',');
7630 if (token.type != ')') {
7632 (void)parse_assignment_expression();
7633 if (token.type != ',')
7639 rem_anchor_token(',');
7640 rem_anchor_token(')');
7648 * Parses a primary expression.
7650 static expression_t *parse_primary_expression(void)
7652 switch (token.type) {
7653 case T_false: return parse_bool_const(false);
7654 case T_true: return parse_bool_const(true);
7655 case T_INTEGER: return parse_int_const();
7656 case T_CHARACTER_CONSTANT: return parse_character_constant();
7657 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7658 case T_FLOATINGPOINT: return parse_float_const();
7659 case T_STRING_LITERAL:
7660 case T_WIDE_STRING_LITERAL: return parse_string_const();
7661 case T_IDENTIFIER: return parse_reference();
7662 case T___FUNCTION__:
7663 case T___func__: return parse_function_keyword();
7664 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7665 case T___FUNCSIG__: return parse_funcsig_keyword();
7666 case T___FUNCDNAME__: return parse_funcdname_keyword();
7667 case T___builtin_offsetof: return parse_offsetof();
7668 case T___builtin_va_start: return parse_va_start();
7669 case T___builtin_va_arg: return parse_va_arg();
7670 case T___builtin_expect:
7671 case T___builtin_alloca:
7672 case T___builtin_inf:
7673 case T___builtin_inff:
7674 case T___builtin_infl:
7675 case T___builtin_nan:
7676 case T___builtin_nanf:
7677 case T___builtin_nanl:
7678 case T___builtin_huge_val:
7679 case T___builtin_va_end: return parse_builtin_symbol();
7680 case T___builtin_isgreater:
7681 case T___builtin_isgreaterequal:
7682 case T___builtin_isless:
7683 case T___builtin_islessequal:
7684 case T___builtin_islessgreater:
7685 case T___builtin_isunordered: return parse_compare_builtin();
7686 case T___builtin_constant_p: return parse_builtin_constant();
7687 case T___builtin_prefetch: return parse_builtin_prefetch();
7688 case T__assume: return parse_assume();
7691 return parse_label_address();
7694 case '(': return parse_parenthesized_expression();
7695 case T___noop: return parse_noop_expression();
7698 errorf(HERE, "unexpected token '%K', expected an expression", &token);
7699 return create_invalid_expression();
7703 * Check if the expression has the character type and issue a warning then.
7705 static void check_for_char_index_type(const expression_t *expression)
7707 type_t *const type = expression->base.type;
7708 const type_t *const base_type = skip_typeref(type);
7710 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7711 warning.char_subscripts) {
7712 warningf(&expression->base.source_position,
7713 "array subscript has type '%T'", type);
7717 static expression_t *parse_array_expression(expression_t *left)
7719 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7722 add_anchor_token(']');
7724 expression_t *inside = parse_expression();
7726 type_t *const orig_type_left = left->base.type;
7727 type_t *const orig_type_inside = inside->base.type;
7729 type_t *const type_left = skip_typeref(orig_type_left);
7730 type_t *const type_inside = skip_typeref(orig_type_inside);
7732 type_t *return_type;
7733 array_access_expression_t *array_access = &expression->array_access;
7734 if (is_type_pointer(type_left)) {
7735 return_type = type_left->pointer.points_to;
7736 array_access->array_ref = left;
7737 array_access->index = inside;
7738 check_for_char_index_type(inside);
7739 } else if (is_type_pointer(type_inside)) {
7740 return_type = type_inside->pointer.points_to;
7741 array_access->array_ref = inside;
7742 array_access->index = left;
7743 array_access->flipped = true;
7744 check_for_char_index_type(left);
7746 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7748 "array access on object with non-pointer types '%T', '%T'",
7749 orig_type_left, orig_type_inside);
7751 return_type = type_error_type;
7752 array_access->array_ref = left;
7753 array_access->index = inside;
7756 expression->base.type = automatic_type_conversion(return_type);
7758 rem_anchor_token(']');
7764 static expression_t *parse_typeprop(expression_kind_t const kind)
7766 expression_t *tp_expression = allocate_expression_zero(kind);
7767 tp_expression->base.type = type_size_t;
7769 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7771 /* we only refer to a type property, mark this case */
7772 bool old = in_type_prop;
7773 in_type_prop = true;
7776 expression_t *expression;
7777 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7779 add_anchor_token(')');
7780 orig_type = parse_typename();
7781 rem_anchor_token(')');
7784 if (token.type == '{') {
7785 /* It was not sizeof(type) after all. It is sizeof of an expression
7786 * starting with a compound literal */
7787 expression = parse_compound_literal(orig_type);
7788 goto typeprop_expression;
7791 expression = parse_sub_expression(PREC_UNARY);
7793 typeprop_expression:
7794 tp_expression->typeprop.tp_expression = expression;
7796 orig_type = revert_automatic_type_conversion(expression);
7797 expression->base.type = orig_type;
7800 tp_expression->typeprop.type = orig_type;
7801 type_t const* const type = skip_typeref(orig_type);
7802 char const* const wrong_type =
7803 is_type_incomplete(type) ? "incomplete" :
7804 type->kind == TYPE_FUNCTION ? "function designator" :
7805 type->kind == TYPE_BITFIELD ? "bitfield" :
7807 if (wrong_type != NULL) {
7808 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7809 errorf(&tp_expression->base.source_position,
7810 "operand of %s expression must not be of %s type '%T'",
7811 what, wrong_type, orig_type);
7816 return tp_expression;
7819 static expression_t *parse_sizeof(void)
7821 return parse_typeprop(EXPR_SIZEOF);
7824 static expression_t *parse_alignof(void)
7826 return parse_typeprop(EXPR_ALIGNOF);
7829 static expression_t *parse_select_expression(expression_t *compound)
7831 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7832 select->select.compound = compound;
7834 assert(token.type == '.' || token.type == T_MINUSGREATER);
7835 bool is_pointer = (token.type == T_MINUSGREATER);
7838 if (token.type != T_IDENTIFIER) {
7839 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7842 symbol_t *symbol = token.v.symbol;
7845 type_t *const orig_type = compound->base.type;
7846 type_t *const type = skip_typeref(orig_type);
7849 bool saw_error = false;
7850 if (is_type_pointer(type)) {
7853 "request for member '%Y' in something not a struct or union, but '%T'",
7857 type_left = skip_typeref(type->pointer.points_to);
7859 if (is_pointer && is_type_valid(type)) {
7860 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7867 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7868 type_left->kind == TYPE_COMPOUND_UNION) {
7869 compound_t *compound = type_left->compound.compound;
7871 if (!compound->complete) {
7872 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7874 goto create_error_entry;
7877 entry = find_compound_entry(compound, symbol);
7878 if (entry == NULL) {
7879 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7880 goto create_error_entry;
7883 if (is_type_valid(type_left) && !saw_error) {
7885 "request for member '%Y' in something not a struct or union, but '%T'",
7889 return create_invalid_expression();
7892 assert(is_declaration(entry));
7893 select->select.compound_entry = entry;
7895 type_t *entry_type = entry->declaration.type;
7897 = get_qualified_type(entry_type, type_left->base.qualifiers);
7899 /* we always do the auto-type conversions; the & and sizeof parser contains
7900 * code to revert this! */
7901 select->base.type = automatic_type_conversion(res_type);
7903 type_t *skipped = skip_typeref(res_type);
7904 if (skipped->kind == TYPE_BITFIELD) {
7905 select->base.type = skipped->bitfield.base_type;
7911 static void check_call_argument(const function_parameter_t *parameter,
7912 call_argument_t *argument, unsigned pos)
7914 type_t *expected_type = parameter->type;
7915 type_t *expected_type_skip = skip_typeref(expected_type);
7916 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7917 expression_t *arg_expr = argument->expression;
7918 type_t *arg_type = skip_typeref(arg_expr->base.type);
7920 /* handle transparent union gnu extension */
7921 if (is_type_union(expected_type_skip)
7922 && (expected_type_skip->base.modifiers
7923 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7924 compound_t *union_decl = expected_type_skip->compound.compound;
7925 type_t *best_type = NULL;
7926 entity_t *entry = union_decl->members.entities;
7927 for ( ; entry != NULL; entry = entry->base.next) {
7928 assert(is_declaration(entry));
7929 type_t *decl_type = entry->declaration.type;
7930 error = semantic_assign(decl_type, arg_expr);
7931 if (error == ASSIGN_ERROR_INCOMPATIBLE
7932 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7935 if (error == ASSIGN_SUCCESS) {
7936 best_type = decl_type;
7937 } else if (best_type == NULL) {
7938 best_type = decl_type;
7942 if (best_type != NULL) {
7943 expected_type = best_type;
7947 error = semantic_assign(expected_type, arg_expr);
7948 argument->expression = create_implicit_cast(argument->expression,
7951 if (error != ASSIGN_SUCCESS) {
7952 /* report exact scope in error messages (like "in argument 3") */
7954 snprintf(buf, sizeof(buf), "call argument %u", pos);
7955 report_assign_error(error, expected_type, arg_expr, buf,
7956 &arg_expr->base.source_position);
7957 } else if (warning.traditional || warning.conversion) {
7958 type_t *const promoted_type = get_default_promoted_type(arg_type);
7959 if (!types_compatible(expected_type_skip, promoted_type) &&
7960 !types_compatible(expected_type_skip, type_void_ptr) &&
7961 !types_compatible(type_void_ptr, promoted_type)) {
7962 /* Deliberately show the skipped types in this warning */
7963 warningf(&arg_expr->base.source_position,
7964 "passing call argument %u as '%T' rather than '%T' due to prototype",
7965 pos, expected_type_skip, promoted_type);
7971 * Parse a call expression, ie. expression '( ... )'.
7973 * @param expression the function address
7975 static expression_t *parse_call_expression(expression_t *expression)
7977 expression_t *result = allocate_expression_zero(EXPR_CALL);
7978 call_expression_t *call = &result->call;
7979 call->function = expression;
7981 type_t *const orig_type = expression->base.type;
7982 type_t *const type = skip_typeref(orig_type);
7984 function_type_t *function_type = NULL;
7985 if (is_type_pointer(type)) {
7986 type_t *const to_type = skip_typeref(type->pointer.points_to);
7988 if (is_type_function(to_type)) {
7989 function_type = &to_type->function;
7990 call->base.type = function_type->return_type;
7994 if (function_type == NULL && is_type_valid(type)) {
7995 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7998 /* parse arguments */
8000 add_anchor_token(')');
8001 add_anchor_token(',');
8003 if (token.type != ')') {
8004 call_argument_t *last_argument = NULL;
8007 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8009 argument->expression = parse_assignment_expression();
8010 if (last_argument == NULL) {
8011 call->arguments = argument;
8013 last_argument->next = argument;
8015 last_argument = argument;
8017 if (token.type != ',')
8022 rem_anchor_token(',');
8023 rem_anchor_token(')');
8026 if (function_type == NULL)
8029 function_parameter_t *parameter = function_type->parameters;
8030 call_argument_t *argument = call->arguments;
8031 if (!function_type->unspecified_parameters) {
8032 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8033 parameter = parameter->next, argument = argument->next) {
8034 check_call_argument(parameter, argument, ++pos);
8037 if (parameter != NULL) {
8038 errorf(HERE, "too few arguments to function '%E'", expression);
8039 } else if (argument != NULL && !function_type->variadic) {
8040 errorf(HERE, "too many arguments to function '%E'", expression);
8044 /* do default promotion */
8045 for (; argument != NULL; argument = argument->next) {
8046 type_t *type = argument->expression->base.type;
8048 type = get_default_promoted_type(type);
8050 argument->expression
8051 = create_implicit_cast(argument->expression, type);
8054 check_format(&result->call);
8056 if (warning.aggregate_return &&
8057 is_type_compound(skip_typeref(function_type->return_type))) {
8058 warningf(&result->base.source_position,
8059 "function call has aggregate value");
8066 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8068 static bool same_compound_type(const type_t *type1, const type_t *type2)
8071 is_type_compound(type1) &&
8072 type1->kind == type2->kind &&
8073 type1->compound.compound == type2->compound.compound;
8076 static expression_t const *get_reference_address(expression_t const *expr)
8078 bool regular_take_address = true;
8080 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8081 expr = expr->unary.value;
8083 regular_take_address = false;
8086 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8089 expr = expr->unary.value;
8092 if (expr->kind != EXPR_REFERENCE)
8095 /* special case for functions which are automatically converted to a
8096 * pointer to function without an extra TAKE_ADDRESS operation */
8097 if (!regular_take_address &&
8098 expr->reference.entity->kind != ENTITY_FUNCTION) {
8105 static void warn_reference_address_as_bool(expression_t const* expr)
8107 if (!warning.address)
8110 expr = get_reference_address(expr);
8112 warningf(&expr->base.source_position,
8113 "the address of '%Y' will always evaluate as 'true'",
8114 expr->reference.entity->base.symbol);
8118 static void semantic_condition(expression_t const *const expr,
8119 char const *const context)
8121 type_t *const type = skip_typeref(expr->base.type);
8122 if (is_type_scalar(type)) {
8123 warn_reference_address_as_bool(expr);
8124 } else if (is_type_valid(type)) {
8125 errorf(&expr->base.source_position,
8126 "%s must have scalar type", context);
8131 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8133 * @param expression the conditional expression
8135 static expression_t *parse_conditional_expression(expression_t *expression)
8137 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8139 conditional_expression_t *conditional = &result->conditional;
8140 conditional->condition = expression;
8143 add_anchor_token(':');
8145 /* §6.5.15:2 The first operand shall have scalar type. */
8146 semantic_condition(expression, "condition of conditional operator");
8148 expression_t *true_expression = expression;
8149 bool gnu_cond = false;
8150 if (GNU_MODE && token.type == ':') {
8153 true_expression = parse_expression();
8155 rem_anchor_token(':');
8157 expression_t *false_expression =
8158 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8160 type_t *const orig_true_type = true_expression->base.type;
8161 type_t *const orig_false_type = false_expression->base.type;
8162 type_t *const true_type = skip_typeref(orig_true_type);
8163 type_t *const false_type = skip_typeref(orig_false_type);
8166 type_t *result_type;
8167 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8168 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8169 /* ISO/IEC 14882:1998(E) §5.16:2 */
8170 if (true_expression->kind == EXPR_UNARY_THROW) {
8171 result_type = false_type;
8172 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8173 result_type = true_type;
8175 if (warning.other && (
8176 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8177 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8179 warningf(&conditional->base.source_position,
8180 "ISO C forbids conditional expression with only one void side");
8182 result_type = type_void;
8184 } else if (is_type_arithmetic(true_type)
8185 && is_type_arithmetic(false_type)) {
8186 result_type = semantic_arithmetic(true_type, false_type);
8188 true_expression = create_implicit_cast(true_expression, result_type);
8189 false_expression = create_implicit_cast(false_expression, result_type);
8191 conditional->true_expression = true_expression;
8192 conditional->false_expression = false_expression;
8193 conditional->base.type = result_type;
8194 } else if (same_compound_type(true_type, false_type)) {
8195 /* just take 1 of the 2 types */
8196 result_type = true_type;
8197 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8198 type_t *pointer_type;
8200 expression_t *other_expression;
8201 if (is_type_pointer(true_type) &&
8202 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8203 pointer_type = true_type;
8204 other_type = false_type;
8205 other_expression = false_expression;
8207 pointer_type = false_type;
8208 other_type = true_type;
8209 other_expression = true_expression;
8212 if (is_null_pointer_constant(other_expression)) {
8213 result_type = pointer_type;
8214 } else if (is_type_pointer(other_type)) {
8215 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8216 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8219 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8220 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8222 } else if (types_compatible(get_unqualified_type(to1),
8223 get_unqualified_type(to2))) {
8226 if (warning.other) {
8227 warningf(&conditional->base.source_position,
8228 "pointer types '%T' and '%T' in conditional expression are incompatible",
8229 true_type, false_type);
8234 type_t *const type =
8235 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8236 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8237 } else if (is_type_integer(other_type)) {
8238 if (warning.other) {
8239 warningf(&conditional->base.source_position,
8240 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8242 result_type = pointer_type;
8244 if (is_type_valid(other_type)) {
8245 type_error_incompatible("while parsing conditional",
8246 &expression->base.source_position, true_type, false_type);
8248 result_type = type_error_type;
8251 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8252 type_error_incompatible("while parsing conditional",
8253 &conditional->base.source_position, true_type,
8256 result_type = type_error_type;
8259 conditional->true_expression
8260 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8261 conditional->false_expression
8262 = create_implicit_cast(false_expression, result_type);
8263 conditional->base.type = result_type;
8266 return create_invalid_expression();
8270 * Parse an extension expression.
8272 static expression_t *parse_extension(void)
8274 eat(T___extension__);
8276 bool old_gcc_extension = in_gcc_extension;
8277 in_gcc_extension = true;
8278 expression_t *expression = parse_sub_expression(PREC_UNARY);
8279 in_gcc_extension = old_gcc_extension;
8284 * Parse a __builtin_classify_type() expression.
8286 static expression_t *parse_builtin_classify_type(void)
8288 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8289 result->base.type = type_int;
8291 eat(T___builtin_classify_type);
8294 add_anchor_token(')');
8295 expression_t *expression = parse_expression();
8296 rem_anchor_token(')');
8298 result->classify_type.type_expression = expression;
8302 return create_invalid_expression();
8306 * Parse a delete expression
8307 * ISO/IEC 14882:1998(E) §5.3.5
8309 static expression_t *parse_delete(void)
8311 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8312 result->base.type = type_void;
8316 if (token.type == '[') {
8318 result->kind = EXPR_UNARY_DELETE_ARRAY;
8323 expression_t *const value = parse_sub_expression(PREC_CAST);
8324 result->unary.value = value;
8326 type_t *const type = skip_typeref(value->base.type);
8327 if (!is_type_pointer(type)) {
8328 errorf(&value->base.source_position,
8329 "operand of delete must have pointer type");
8330 } else if (warning.other &&
8331 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8332 warningf(&value->base.source_position,
8333 "deleting 'void*' is undefined");
8340 * Parse a throw expression
8341 * ISO/IEC 14882:1998(E) §15:1
8343 static expression_t *parse_throw(void)
8345 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8346 result->base.type = type_void;
8350 expression_t *value = NULL;
8351 switch (token.type) {
8353 value = parse_assignment_expression();
8354 /* ISO/IEC 14882:1998(E) §15.1:3 */
8355 type_t *const orig_type = value->base.type;
8356 type_t *const type = skip_typeref(orig_type);
8357 if (is_type_incomplete(type)) {
8358 errorf(&value->base.source_position,
8359 "cannot throw object of incomplete type '%T'", orig_type);
8360 } else if (is_type_pointer(type)) {
8361 type_t *const points_to = skip_typeref(type->pointer.points_to);
8362 if (is_type_incomplete(points_to) &&
8363 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8364 errorf(&value->base.source_position,
8365 "cannot throw pointer to incomplete type '%T'", orig_type);
8373 result->unary.value = value;
8378 static bool check_pointer_arithmetic(const source_position_t *source_position,
8379 type_t *pointer_type,
8380 type_t *orig_pointer_type)
8382 type_t *points_to = pointer_type->pointer.points_to;
8383 points_to = skip_typeref(points_to);
8385 if (is_type_incomplete(points_to)) {
8386 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8387 errorf(source_position,
8388 "arithmetic with pointer to incomplete type '%T' not allowed",
8391 } else if (warning.pointer_arith) {
8392 warningf(source_position,
8393 "pointer of type '%T' used in arithmetic",
8396 } else if (is_type_function(points_to)) {
8398 errorf(source_position,
8399 "arithmetic with pointer to function type '%T' not allowed",
8402 } else if (warning.pointer_arith) {
8403 warningf(source_position,
8404 "pointer to a function '%T' used in arithmetic",
8411 static bool is_lvalue(const expression_t *expression)
8413 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8414 switch (expression->kind) {
8415 case EXPR_REFERENCE:
8416 case EXPR_ARRAY_ACCESS:
8418 case EXPR_UNARY_DEREFERENCE:
8422 type_t *type = skip_typeref(expression->base.type);
8424 /* ISO/IEC 14882:1998(E) §3.10:3 */
8425 is_type_reference(type) ||
8426 /* Claim it is an lvalue, if the type is invalid. There was a parse
8427 * error before, which maybe prevented properly recognizing it as
8429 !is_type_valid(type);
8434 static void semantic_incdec(unary_expression_t *expression)
8436 type_t *const orig_type = expression->value->base.type;
8437 type_t *const type = skip_typeref(orig_type);
8438 if (is_type_pointer(type)) {
8439 if (!check_pointer_arithmetic(&expression->base.source_position,
8443 } else if (!is_type_real(type) && is_type_valid(type)) {
8444 /* TODO: improve error message */
8445 errorf(&expression->base.source_position,
8446 "operation needs an arithmetic or pointer type");
8449 if (!is_lvalue(expression->value)) {
8450 /* TODO: improve error message */
8451 errorf(&expression->base.source_position, "lvalue required as operand");
8453 expression->base.type = orig_type;
8456 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8458 type_t *const orig_type = expression->value->base.type;
8459 type_t *const type = skip_typeref(orig_type);
8460 if (!is_type_arithmetic(type)) {
8461 if (is_type_valid(type)) {
8462 /* TODO: improve error message */
8463 errorf(&expression->base.source_position,
8464 "operation needs an arithmetic type");
8469 expression->base.type = orig_type;
8472 static void semantic_unexpr_plus(unary_expression_t *expression)
8474 semantic_unexpr_arithmetic(expression);
8475 if (warning.traditional)
8476 warningf(&expression->base.source_position,
8477 "traditional C rejects the unary plus operator");
8480 static void semantic_not(unary_expression_t *expression)
8482 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8483 semantic_condition(expression->value, "operand of !");
8484 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8487 static void semantic_unexpr_integer(unary_expression_t *expression)
8489 type_t *const orig_type = expression->value->base.type;
8490 type_t *const type = skip_typeref(orig_type);
8491 if (!is_type_integer(type)) {
8492 if (is_type_valid(type)) {
8493 errorf(&expression->base.source_position,
8494 "operand of ~ must be of integer type");
8499 expression->base.type = orig_type;
8502 static void semantic_dereference(unary_expression_t *expression)
8504 type_t *const orig_type = expression->value->base.type;
8505 type_t *const type = skip_typeref(orig_type);
8506 if (!is_type_pointer(type)) {
8507 if (is_type_valid(type)) {
8508 errorf(&expression->base.source_position,
8509 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8514 type_t *result_type = type->pointer.points_to;
8515 result_type = automatic_type_conversion(result_type);
8516 expression->base.type = result_type;
8520 * Record that an address is taken (expression represents an lvalue).
8522 * @param expression the expression
8523 * @param may_be_register if true, the expression might be an register
8525 static void set_address_taken(expression_t *expression, bool may_be_register)
8527 if (expression->kind != EXPR_REFERENCE)
8530 entity_t *const entity = expression->reference.entity;
8532 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8535 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8536 && !may_be_register) {
8537 errorf(&expression->base.source_position,
8538 "address of register %s '%Y' requested",
8539 get_entity_kind_name(entity->kind), entity->base.symbol);
8542 if (entity->kind == ENTITY_VARIABLE) {
8543 entity->variable.address_taken = true;
8545 assert(entity->kind == ENTITY_PARAMETER);
8546 entity->parameter.address_taken = true;
8551 * Check the semantic of the address taken expression.
8553 static void semantic_take_addr(unary_expression_t *expression)
8555 expression_t *value = expression->value;
8556 value->base.type = revert_automatic_type_conversion(value);
8558 type_t *orig_type = value->base.type;
8559 type_t *type = skip_typeref(orig_type);
8560 if (!is_type_valid(type))
8564 if (!is_lvalue(value)) {
8565 errorf(&expression->base.source_position, "'&' requires an lvalue");
8567 if (type->kind == TYPE_BITFIELD) {
8568 errorf(&expression->base.source_position,
8569 "'&' not allowed on object with bitfield type '%T'",
8573 set_address_taken(value, false);
8575 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8578 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8579 static expression_t *parse_##unexpression_type(void) \
8581 expression_t *unary_expression \
8582 = allocate_expression_zero(unexpression_type); \
8584 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8586 sfunc(&unary_expression->unary); \
8588 return unary_expression; \
8591 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8592 semantic_unexpr_arithmetic)
8593 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8594 semantic_unexpr_plus)
8595 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8597 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8598 semantic_dereference)
8599 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8601 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8602 semantic_unexpr_integer)
8603 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8605 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8608 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8610 static expression_t *parse_##unexpression_type(expression_t *left) \
8612 expression_t *unary_expression \
8613 = allocate_expression_zero(unexpression_type); \
8615 unary_expression->unary.value = left; \
8617 sfunc(&unary_expression->unary); \
8619 return unary_expression; \
8622 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8623 EXPR_UNARY_POSTFIX_INCREMENT,
8625 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8626 EXPR_UNARY_POSTFIX_DECREMENT,
8629 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8631 /* TODO: handle complex + imaginary types */
8633 type_left = get_unqualified_type(type_left);
8634 type_right = get_unqualified_type(type_right);
8636 /* § 6.3.1.8 Usual arithmetic conversions */
8637 if (type_left == type_long_double || type_right == type_long_double) {
8638 return type_long_double;
8639 } else if (type_left == type_double || type_right == type_double) {
8641 } else if (type_left == type_float || type_right == type_float) {
8645 type_left = promote_integer(type_left);
8646 type_right = promote_integer(type_right);
8648 if (type_left == type_right)
8651 bool const signed_left = is_type_signed(type_left);
8652 bool const signed_right = is_type_signed(type_right);
8653 int const rank_left = get_rank(type_left);
8654 int const rank_right = get_rank(type_right);
8656 if (signed_left == signed_right)
8657 return rank_left >= rank_right ? type_left : type_right;
8666 u_rank = rank_right;
8667 u_type = type_right;
8669 s_rank = rank_right;
8670 s_type = type_right;
8675 if (u_rank >= s_rank)
8678 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8680 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8681 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8685 case ATOMIC_TYPE_INT: return type_unsigned_int;
8686 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8687 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8689 default: panic("invalid atomic type");
8694 * Check the semantic restrictions for a binary expression.
8696 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8698 expression_t *const left = expression->left;
8699 expression_t *const right = expression->right;
8700 type_t *const orig_type_left = left->base.type;
8701 type_t *const orig_type_right = right->base.type;
8702 type_t *const type_left = skip_typeref(orig_type_left);
8703 type_t *const type_right = skip_typeref(orig_type_right);
8705 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8706 /* TODO: improve error message */
8707 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8708 errorf(&expression->base.source_position,
8709 "operation needs arithmetic types");
8714 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8715 expression->left = create_implicit_cast(left, arithmetic_type);
8716 expression->right = create_implicit_cast(right, arithmetic_type);
8717 expression->base.type = arithmetic_type;
8720 static void warn_div_by_zero(binary_expression_t const *const expression)
8722 if (!warning.div_by_zero ||
8723 !is_type_integer(expression->base.type))
8726 expression_t const *const right = expression->right;
8727 /* The type of the right operand can be different for /= */
8728 if (is_type_integer(right->base.type) &&
8729 is_constant_expression(right) &&
8730 fold_constant(right) == 0) {
8731 warningf(&expression->base.source_position, "division by zero");
8736 * Check the semantic restrictions for a div/mod expression.
8738 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8739 semantic_binexpr_arithmetic(expression);
8740 warn_div_by_zero(expression);
8743 static void semantic_shift_op(binary_expression_t *expression)
8745 expression_t *const left = expression->left;
8746 expression_t *const right = expression->right;
8747 type_t *const orig_type_left = left->base.type;
8748 type_t *const orig_type_right = right->base.type;
8749 type_t * type_left = skip_typeref(orig_type_left);
8750 type_t * type_right = skip_typeref(orig_type_right);
8752 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8753 /* TODO: improve error message */
8754 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8755 errorf(&expression->base.source_position,
8756 "operands of shift operation must have integer types");
8761 type_left = promote_integer(type_left);
8762 type_right = promote_integer(type_right);
8764 expression->left = create_implicit_cast(left, type_left);
8765 expression->right = create_implicit_cast(right, type_right);
8766 expression->base.type = type_left;
8769 static void semantic_add(binary_expression_t *expression)
8771 expression_t *const left = expression->left;
8772 expression_t *const right = expression->right;
8773 type_t *const orig_type_left = left->base.type;
8774 type_t *const orig_type_right = right->base.type;
8775 type_t *const type_left = skip_typeref(orig_type_left);
8776 type_t *const type_right = skip_typeref(orig_type_right);
8779 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8780 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8781 expression->left = create_implicit_cast(left, arithmetic_type);
8782 expression->right = create_implicit_cast(right, arithmetic_type);
8783 expression->base.type = arithmetic_type;
8785 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8786 check_pointer_arithmetic(&expression->base.source_position,
8787 type_left, orig_type_left);
8788 expression->base.type = type_left;
8789 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8790 check_pointer_arithmetic(&expression->base.source_position,
8791 type_right, orig_type_right);
8792 expression->base.type = type_right;
8793 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8794 errorf(&expression->base.source_position,
8795 "invalid operands to binary + ('%T', '%T')",
8796 orig_type_left, orig_type_right);
8800 static void semantic_sub(binary_expression_t *expression)
8802 expression_t *const left = expression->left;
8803 expression_t *const right = expression->right;
8804 type_t *const orig_type_left = left->base.type;
8805 type_t *const orig_type_right = right->base.type;
8806 type_t *const type_left = skip_typeref(orig_type_left);
8807 type_t *const type_right = skip_typeref(orig_type_right);
8808 source_position_t const *const pos = &expression->base.source_position;
8811 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8812 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8813 expression->left = create_implicit_cast(left, arithmetic_type);
8814 expression->right = create_implicit_cast(right, arithmetic_type);
8815 expression->base.type = arithmetic_type;
8817 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8818 check_pointer_arithmetic(&expression->base.source_position,
8819 type_left, orig_type_left);
8820 expression->base.type = type_left;
8821 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8822 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8823 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8824 if (!types_compatible(unqual_left, unqual_right)) {
8826 "subtracting pointers to incompatible types '%T' and '%T'",
8827 orig_type_left, orig_type_right);
8828 } else if (!is_type_object(unqual_left)) {
8829 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8830 errorf(pos, "subtracting pointers to non-object types '%T'",
8832 } else if (warning.other) {
8833 warningf(pos, "subtracting pointers to void");
8836 expression->base.type = type_ptrdiff_t;
8837 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8838 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8839 orig_type_left, orig_type_right);
8843 static void warn_string_literal_address(expression_t const* expr)
8845 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8846 expr = expr->unary.value;
8847 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8849 expr = expr->unary.value;
8852 if (expr->kind == EXPR_STRING_LITERAL ||
8853 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8854 warningf(&expr->base.source_position,
8855 "comparison with string literal results in unspecified behaviour");
8860 * Check the semantics of comparison expressions.
8862 * @param expression The expression to check.
8864 static void semantic_comparison(binary_expression_t *expression)
8866 expression_t *left = expression->left;
8867 expression_t *right = expression->right;
8869 if (warning.address) {
8870 warn_string_literal_address(left);
8871 warn_string_literal_address(right);
8873 expression_t const* const func_left = get_reference_address(left);
8874 if (func_left != NULL && is_null_pointer_constant(right)) {
8875 warningf(&expression->base.source_position,
8876 "the address of '%Y' will never be NULL",
8877 func_left->reference.entity->base.symbol);
8880 expression_t const* const func_right = get_reference_address(right);
8881 if (func_right != NULL && is_null_pointer_constant(right)) {
8882 warningf(&expression->base.source_position,
8883 "the address of '%Y' will never be NULL",
8884 func_right->reference.entity->base.symbol);
8888 type_t *orig_type_left = left->base.type;
8889 type_t *orig_type_right = right->base.type;
8890 type_t *type_left = skip_typeref(orig_type_left);
8891 type_t *type_right = skip_typeref(orig_type_right);
8893 /* TODO non-arithmetic types */
8894 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8895 /* test for signed vs unsigned compares */
8896 if (warning.sign_compare &&
8897 (expression->base.kind != EXPR_BINARY_EQUAL &&
8898 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
8899 (is_type_signed(type_left) != is_type_signed(type_right))) {
8901 /* check if 1 of the operands is a constant, in this case we just
8902 * check wether we can safely represent the resulting constant in
8903 * the type of the other operand. */
8904 expression_t *const_expr = NULL;
8905 expression_t *other_expr = NULL;
8907 if (is_constant_expression(left)) {
8910 } else if (is_constant_expression(right)) {
8915 if (const_expr != NULL) {
8916 type_t *other_type = skip_typeref(other_expr->base.type);
8917 long val = fold_constant(const_expr);
8918 /* TODO: check if val can be represented by other_type */
8922 warningf(&expression->base.source_position,
8923 "comparison between signed and unsigned");
8925 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8926 expression->left = create_implicit_cast(left, arithmetic_type);
8927 expression->right = create_implicit_cast(right, arithmetic_type);
8928 expression->base.type = arithmetic_type;
8929 if (warning.float_equal &&
8930 (expression->base.kind == EXPR_BINARY_EQUAL ||
8931 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8932 is_type_float(arithmetic_type)) {
8933 warningf(&expression->base.source_position,
8934 "comparing floating point with == or != is unsafe");
8936 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8937 /* TODO check compatibility */
8938 } else if (is_type_pointer(type_left)) {
8939 expression->right = create_implicit_cast(right, type_left);
8940 } else if (is_type_pointer(type_right)) {
8941 expression->left = create_implicit_cast(left, type_right);
8942 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8943 type_error_incompatible("invalid operands in comparison",
8944 &expression->base.source_position,
8945 type_left, type_right);
8947 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8951 * Checks if a compound type has constant fields.
8953 static bool has_const_fields(const compound_type_t *type)
8955 compound_t *compound = type->compound;
8956 entity_t *entry = compound->members.entities;
8958 for (; entry != NULL; entry = entry->base.next) {
8959 if (!is_declaration(entry))
8962 const type_t *decl_type = skip_typeref(entry->declaration.type);
8963 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8970 static bool is_valid_assignment_lhs(expression_t const* const left)
8972 type_t *const orig_type_left = revert_automatic_type_conversion(left);
8973 type_t *const type_left = skip_typeref(orig_type_left);
8975 if (!is_lvalue(left)) {
8976 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8981 if (left->kind == EXPR_REFERENCE
8982 && left->reference.entity->kind == ENTITY_FUNCTION) {
8983 errorf(HERE, "cannot assign to function '%E'", left);
8987 if (is_type_array(type_left)) {
8988 errorf(HERE, "cannot assign to array '%E'", left);
8991 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8992 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8996 if (is_type_incomplete(type_left)) {
8997 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8998 left, orig_type_left);
9001 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9002 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9003 left, orig_type_left);
9010 static void semantic_arithmetic_assign(binary_expression_t *expression)
9012 expression_t *left = expression->left;
9013 expression_t *right = expression->right;
9014 type_t *orig_type_left = left->base.type;
9015 type_t *orig_type_right = right->base.type;
9017 if (!is_valid_assignment_lhs(left))
9020 type_t *type_left = skip_typeref(orig_type_left);
9021 type_t *type_right = skip_typeref(orig_type_right);
9023 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9024 /* TODO: improve error message */
9025 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9026 errorf(&expression->base.source_position,
9027 "operation needs arithmetic types");
9032 /* combined instructions are tricky. We can't create an implicit cast on
9033 * the left side, because we need the uncasted form for the store.
9034 * The ast2firm pass has to know that left_type must be right_type
9035 * for the arithmetic operation and create a cast by itself */
9036 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9037 expression->right = create_implicit_cast(right, arithmetic_type);
9038 expression->base.type = type_left;
9041 static void semantic_divmod_assign(binary_expression_t *expression)
9043 semantic_arithmetic_assign(expression);
9044 warn_div_by_zero(expression);
9047 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9049 expression_t *const left = expression->left;
9050 expression_t *const right = expression->right;
9051 type_t *const orig_type_left = left->base.type;
9052 type_t *const orig_type_right = right->base.type;
9053 type_t *const type_left = skip_typeref(orig_type_left);
9054 type_t *const type_right = skip_typeref(orig_type_right);
9056 if (!is_valid_assignment_lhs(left))
9059 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9060 /* combined instructions are tricky. We can't create an implicit cast on
9061 * the left side, because we need the uncasted form for the store.
9062 * The ast2firm pass has to know that left_type must be right_type
9063 * for the arithmetic operation and create a cast by itself */
9064 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9065 expression->right = create_implicit_cast(right, arithmetic_type);
9066 expression->base.type = type_left;
9067 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9068 check_pointer_arithmetic(&expression->base.source_position,
9069 type_left, orig_type_left);
9070 expression->base.type = type_left;
9071 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9072 errorf(&expression->base.source_position,
9073 "incompatible types '%T' and '%T' in assignment",
9074 orig_type_left, orig_type_right);
9079 * Check the semantic restrictions of a logical expression.
9081 static void semantic_logical_op(binary_expression_t *expression)
9083 /* §6.5.13:2 Each of the operands shall have scalar type.
9084 * §6.5.14:2 Each of the operands shall have scalar type. */
9085 semantic_condition(expression->left, "left operand of logical operator");
9086 semantic_condition(expression->right, "right operand of logical operator");
9087 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9091 * Check the semantic restrictions of a binary assign expression.
9093 static void semantic_binexpr_assign(binary_expression_t *expression)
9095 expression_t *left = expression->left;
9096 type_t *orig_type_left = left->base.type;
9098 if (!is_valid_assignment_lhs(left))
9101 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9102 report_assign_error(error, orig_type_left, expression->right,
9103 "assignment", &left->base.source_position);
9104 expression->right = create_implicit_cast(expression->right, orig_type_left);
9105 expression->base.type = orig_type_left;
9109 * Determine if the outermost operation (or parts thereof) of the given
9110 * expression has no effect in order to generate a warning about this fact.
9111 * Therefore in some cases this only examines some of the operands of the
9112 * expression (see comments in the function and examples below).
9114 * f() + 23; // warning, because + has no effect
9115 * x || f(); // no warning, because x controls execution of f()
9116 * x ? y : f(); // warning, because y has no effect
9117 * (void)x; // no warning to be able to suppress the warning
9118 * This function can NOT be used for an "expression has definitely no effect"-
9120 static bool expression_has_effect(const expression_t *const expr)
9122 switch (expr->kind) {
9123 case EXPR_UNKNOWN: break;
9124 case EXPR_INVALID: return true; /* do NOT warn */
9125 case EXPR_REFERENCE: return false;
9126 case EXPR_REFERENCE_ENUM_VALUE: return false;
9127 /* suppress the warning for microsoft __noop operations */
9128 case EXPR_CONST: return expr->conste.is_ms_noop;
9129 case EXPR_CHARACTER_CONSTANT: return false;
9130 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9131 case EXPR_STRING_LITERAL: return false;
9132 case EXPR_WIDE_STRING_LITERAL: return false;
9133 case EXPR_LABEL_ADDRESS: return false;
9136 const call_expression_t *const call = &expr->call;
9137 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9140 switch (call->function->builtin_symbol.symbol->ID) {
9141 case T___builtin_va_end: return true;
9142 default: return false;
9146 /* Generate the warning if either the left or right hand side of a
9147 * conditional expression has no effect */
9148 case EXPR_CONDITIONAL: {
9149 const conditional_expression_t *const cond = &expr->conditional;
9151 expression_has_effect(cond->true_expression) &&
9152 expression_has_effect(cond->false_expression);
9155 case EXPR_SELECT: return false;
9156 case EXPR_ARRAY_ACCESS: return false;
9157 case EXPR_SIZEOF: return false;
9158 case EXPR_CLASSIFY_TYPE: return false;
9159 case EXPR_ALIGNOF: return false;
9161 case EXPR_FUNCNAME: return false;
9162 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9163 case EXPR_BUILTIN_CONSTANT_P: return false;
9164 case EXPR_BUILTIN_PREFETCH: return true;
9165 case EXPR_OFFSETOF: return false;
9166 case EXPR_VA_START: return true;
9167 case EXPR_VA_ARG: return true;
9168 case EXPR_STATEMENT: return true; // TODO
9169 case EXPR_COMPOUND_LITERAL: return false;
9171 case EXPR_UNARY_NEGATE: return false;
9172 case EXPR_UNARY_PLUS: return false;
9173 case EXPR_UNARY_BITWISE_NEGATE: return false;
9174 case EXPR_UNARY_NOT: return false;
9175 case EXPR_UNARY_DEREFERENCE: return false;
9176 case EXPR_UNARY_TAKE_ADDRESS: return false;
9177 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9178 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9179 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9180 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9182 /* Treat void casts as if they have an effect in order to being able to
9183 * suppress the warning */
9184 case EXPR_UNARY_CAST: {
9185 type_t *const type = skip_typeref(expr->base.type);
9186 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9189 case EXPR_UNARY_CAST_IMPLICIT: return true;
9190 case EXPR_UNARY_ASSUME: return true;
9191 case EXPR_UNARY_DELETE: return true;
9192 case EXPR_UNARY_DELETE_ARRAY: return true;
9193 case EXPR_UNARY_THROW: return true;
9195 case EXPR_BINARY_ADD: return false;
9196 case EXPR_BINARY_SUB: return false;
9197 case EXPR_BINARY_MUL: return false;
9198 case EXPR_BINARY_DIV: return false;
9199 case EXPR_BINARY_MOD: return false;
9200 case EXPR_BINARY_EQUAL: return false;
9201 case EXPR_BINARY_NOTEQUAL: return false;
9202 case EXPR_BINARY_LESS: return false;
9203 case EXPR_BINARY_LESSEQUAL: return false;
9204 case EXPR_BINARY_GREATER: return false;
9205 case EXPR_BINARY_GREATEREQUAL: return false;
9206 case EXPR_BINARY_BITWISE_AND: return false;
9207 case EXPR_BINARY_BITWISE_OR: return false;
9208 case EXPR_BINARY_BITWISE_XOR: return false;
9209 case EXPR_BINARY_SHIFTLEFT: return false;
9210 case EXPR_BINARY_SHIFTRIGHT: return false;
9211 case EXPR_BINARY_ASSIGN: return true;
9212 case EXPR_BINARY_MUL_ASSIGN: return true;
9213 case EXPR_BINARY_DIV_ASSIGN: return true;
9214 case EXPR_BINARY_MOD_ASSIGN: return true;
9215 case EXPR_BINARY_ADD_ASSIGN: return true;
9216 case EXPR_BINARY_SUB_ASSIGN: return true;
9217 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9218 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9219 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9220 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9221 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9223 /* Only examine the right hand side of && and ||, because the left hand
9224 * side already has the effect of controlling the execution of the right
9226 case EXPR_BINARY_LOGICAL_AND:
9227 case EXPR_BINARY_LOGICAL_OR:
9228 /* Only examine the right hand side of a comma expression, because the left
9229 * hand side has a separate warning */
9230 case EXPR_BINARY_COMMA:
9231 return expression_has_effect(expr->binary.right);
9233 case EXPR_BINARY_BUILTIN_EXPECT: return true;
9234 case EXPR_BINARY_ISGREATER: return false;
9235 case EXPR_BINARY_ISGREATEREQUAL: return false;
9236 case EXPR_BINARY_ISLESS: return false;
9237 case EXPR_BINARY_ISLESSEQUAL: return false;
9238 case EXPR_BINARY_ISLESSGREATER: return false;
9239 case EXPR_BINARY_ISUNORDERED: return false;
9242 internal_errorf(HERE, "unexpected expression");
9245 static void semantic_comma(binary_expression_t *expression)
9247 if (warning.unused_value) {
9248 const expression_t *const left = expression->left;
9249 if (!expression_has_effect(left)) {
9250 warningf(&left->base.source_position,
9251 "left-hand operand of comma expression has no effect");
9254 expression->base.type = expression->right->base.type;
9258 * @param prec_r precedence of the right operand
9260 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9261 static expression_t *parse_##binexpression_type(expression_t *left) \
9263 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9264 binexpr->binary.left = left; \
9267 expression_t *right = parse_sub_expression(prec_r); \
9269 binexpr->binary.right = right; \
9270 sfunc(&binexpr->binary); \
9275 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9276 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9277 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9278 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9279 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9280 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9281 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9282 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9283 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9284 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9285 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9286 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9287 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9288 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9289 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9290 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9291 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9292 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9293 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9294 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9295 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9296 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9297 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9298 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9299 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9300 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9301 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9302 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9303 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9304 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9307 static expression_t *parse_sub_expression(precedence_t precedence)
9309 if (token.type < 0) {
9310 return expected_expression_error();
9313 expression_parser_function_t *parser
9314 = &expression_parsers[token.type];
9315 source_position_t source_position = token.source_position;
9318 if (parser->parser != NULL) {
9319 left = parser->parser();
9321 left = parse_primary_expression();
9323 assert(left != NULL);
9324 left->base.source_position = source_position;
9327 if (token.type < 0) {
9328 return expected_expression_error();
9331 parser = &expression_parsers[token.type];
9332 if (parser->infix_parser == NULL)
9334 if (parser->infix_precedence < precedence)
9337 left = parser->infix_parser(left);
9339 assert(left != NULL);
9340 assert(left->kind != EXPR_UNKNOWN);
9341 left->base.source_position = source_position;
9348 * Parse an expression.
9350 static expression_t *parse_expression(void)
9352 return parse_sub_expression(PREC_EXPRESSION);
9356 * Register a parser for a prefix-like operator.
9358 * @param parser the parser function
9359 * @param token_type the token type of the prefix token
9361 static void register_expression_parser(parse_expression_function parser,
9364 expression_parser_function_t *entry = &expression_parsers[token_type];
9366 if (entry->parser != NULL) {
9367 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9368 panic("trying to register multiple expression parsers for a token");
9370 entry->parser = parser;
9374 * Register a parser for an infix operator with given precedence.
9376 * @param parser the parser function
9377 * @param token_type the token type of the infix operator
9378 * @param precedence the precedence of the operator
9380 static void register_infix_parser(parse_expression_infix_function parser,
9381 int token_type, unsigned precedence)
9383 expression_parser_function_t *entry = &expression_parsers[token_type];
9385 if (entry->infix_parser != NULL) {
9386 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9387 panic("trying to register multiple infix expression parsers for a "
9390 entry->infix_parser = parser;
9391 entry->infix_precedence = precedence;
9395 * Initialize the expression parsers.
9397 static void init_expression_parsers(void)
9399 memset(&expression_parsers, 0, sizeof(expression_parsers));
9401 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9402 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9403 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9404 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9405 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9406 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9407 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9408 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9409 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9410 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9411 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9412 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9413 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9414 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9415 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9416 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9417 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9418 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9419 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9420 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9421 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9422 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9423 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9424 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9425 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9426 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9427 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9428 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9429 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9430 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9431 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9432 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9433 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9434 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9435 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9436 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9437 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9439 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9440 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9441 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9442 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9443 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9444 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9445 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9446 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9447 register_expression_parser(parse_sizeof, T_sizeof);
9448 register_expression_parser(parse_alignof, T___alignof__);
9449 register_expression_parser(parse_extension, T___extension__);
9450 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9451 register_expression_parser(parse_delete, T_delete);
9452 register_expression_parser(parse_throw, T_throw);
9456 * Parse a asm statement arguments specification.
9458 static asm_argument_t *parse_asm_arguments(bool is_out)
9460 asm_argument_t *result = NULL;
9461 asm_argument_t **anchor = &result;
9463 while (token.type == T_STRING_LITERAL || token.type == '[') {
9464 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9465 memset(argument, 0, sizeof(argument[0]));
9467 if (token.type == '[') {
9469 if (token.type != T_IDENTIFIER) {
9470 parse_error_expected("while parsing asm argument",
9471 T_IDENTIFIER, NULL);
9474 argument->symbol = token.v.symbol;
9479 argument->constraints = parse_string_literals();
9481 add_anchor_token(')');
9482 expression_t *expression = parse_expression();
9483 rem_anchor_token(')');
9485 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9486 * change size or type representation (e.g. int -> long is ok, but
9487 * int -> float is not) */
9488 if (expression->kind == EXPR_UNARY_CAST) {
9489 type_t *const type = expression->base.type;
9490 type_kind_t const kind = type->kind;
9491 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9494 if (kind == TYPE_ATOMIC) {
9495 atomic_type_kind_t const akind = type->atomic.akind;
9496 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9497 size = get_atomic_type_size(akind);
9499 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9500 size = get_atomic_type_size(get_intptr_kind());
9504 expression_t *const value = expression->unary.value;
9505 type_t *const value_type = value->base.type;
9506 type_kind_t const value_kind = value_type->kind;
9508 unsigned value_flags;
9509 unsigned value_size;
9510 if (value_kind == TYPE_ATOMIC) {
9511 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9512 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9513 value_size = get_atomic_type_size(value_akind);
9514 } else if (value_kind == TYPE_POINTER) {
9515 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9516 value_size = get_atomic_type_size(get_intptr_kind());
9521 if (value_flags != flags || value_size != size)
9525 } while (expression->kind == EXPR_UNARY_CAST);
9529 if (!is_lvalue(expression)) {
9530 errorf(&expression->base.source_position,
9531 "asm output argument is not an lvalue");
9534 if (argument->constraints.begin[0] == '+')
9535 mark_vars_read(expression, NULL);
9537 mark_vars_read(expression, NULL);
9539 argument->expression = expression;
9542 set_address_taken(expression, true);
9545 anchor = &argument->next;
9547 if (token.type != ',')
9558 * Parse a asm statement clobber specification.
9560 static asm_clobber_t *parse_asm_clobbers(void)
9562 asm_clobber_t *result = NULL;
9563 asm_clobber_t *last = NULL;
9565 while (token.type == T_STRING_LITERAL) {
9566 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9567 clobber->clobber = parse_string_literals();
9570 last->next = clobber;
9576 if (token.type != ',')
9585 * Parse an asm statement.
9587 static statement_t *parse_asm_statement(void)
9589 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9590 asm_statement_t *asm_statement = &statement->asms;
9594 if (token.type == T_volatile) {
9596 asm_statement->is_volatile = true;
9600 add_anchor_token(')');
9601 add_anchor_token(':');
9602 asm_statement->asm_text = parse_string_literals();
9604 if (token.type != ':') {
9605 rem_anchor_token(':');
9610 asm_statement->outputs = parse_asm_arguments(true);
9611 if (token.type != ':') {
9612 rem_anchor_token(':');
9617 asm_statement->inputs = parse_asm_arguments(false);
9618 if (token.type != ':') {
9619 rem_anchor_token(':');
9622 rem_anchor_token(':');
9625 asm_statement->clobbers = parse_asm_clobbers();
9628 rem_anchor_token(')');
9632 if (asm_statement->outputs == NULL) {
9633 /* GCC: An 'asm' instruction without any output operands will be treated
9634 * identically to a volatile 'asm' instruction. */
9635 asm_statement->is_volatile = true;
9640 return create_invalid_statement();
9644 * Parse a case statement.
9646 static statement_t *parse_case_statement(void)
9648 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9649 source_position_t *const pos = &statement->base.source_position;
9653 expression_t *const expression = parse_expression();
9654 statement->case_label.expression = expression;
9655 if (!is_constant_expression(expression)) {
9656 /* This check does not prevent the error message in all cases of an
9657 * prior error while parsing the expression. At least it catches the
9658 * common case of a mistyped enum entry. */
9659 if (is_type_valid(skip_typeref(expression->base.type))) {
9660 errorf(pos, "case label does not reduce to an integer constant");
9662 statement->case_label.is_bad = true;
9664 long const val = fold_constant(expression);
9665 statement->case_label.first_case = val;
9666 statement->case_label.last_case = val;
9670 if (token.type == T_DOTDOTDOT) {
9672 expression_t *const end_range = parse_expression();
9673 statement->case_label.end_range = end_range;
9674 if (!is_constant_expression(end_range)) {
9675 /* This check does not prevent the error message in all cases of an
9676 * prior error while parsing the expression. At least it catches the
9677 * common case of a mistyped enum entry. */
9678 if (is_type_valid(skip_typeref(end_range->base.type))) {
9679 errorf(pos, "case range does not reduce to an integer constant");
9681 statement->case_label.is_bad = true;
9683 long const val = fold_constant(end_range);
9684 statement->case_label.last_case = val;
9686 if (warning.other && val < statement->case_label.first_case) {
9687 statement->case_label.is_empty_range = true;
9688 warningf(pos, "empty range specified");
9694 PUSH_PARENT(statement);
9699 if (current_switch != NULL) {
9700 if (! statement->case_label.is_bad) {
9701 /* Check for duplicate case values */
9702 case_label_statement_t *c = &statement->case_label;
9703 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9704 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9707 if (c->last_case < l->first_case || c->first_case > l->last_case)
9710 errorf(pos, "duplicate case value (previously used %P)",
9711 &l->base.source_position);
9715 /* link all cases into the switch statement */
9716 if (current_switch->last_case == NULL) {
9717 current_switch->first_case = &statement->case_label;
9719 current_switch->last_case->next = &statement->case_label;
9721 current_switch->last_case = &statement->case_label;
9723 errorf(pos, "case label not within a switch statement");
9726 statement_t *const inner_stmt = parse_statement();
9727 statement->case_label.statement = inner_stmt;
9728 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9729 errorf(&inner_stmt->base.source_position, "declaration after case label");
9737 * Parse a default statement.
9739 static statement_t *parse_default_statement(void)
9741 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9745 PUSH_PARENT(statement);
9748 if (current_switch != NULL) {
9749 const case_label_statement_t *def_label = current_switch->default_label;
9750 if (def_label != NULL) {
9751 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9752 &def_label->base.source_position);
9754 current_switch->default_label = &statement->case_label;
9756 /* link all cases into the switch statement */
9757 if (current_switch->last_case == NULL) {
9758 current_switch->first_case = &statement->case_label;
9760 current_switch->last_case->next = &statement->case_label;
9762 current_switch->last_case = &statement->case_label;
9765 errorf(&statement->base.source_position,
9766 "'default' label not within a switch statement");
9769 statement_t *const inner_stmt = parse_statement();
9770 statement->case_label.statement = inner_stmt;
9771 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9772 errorf(&inner_stmt->base.source_position, "declaration after default label");
9779 return create_invalid_statement();
9783 * Parse a label statement.
9785 static statement_t *parse_label_statement(void)
9787 assert(token.type == T_IDENTIFIER);
9788 symbol_t *symbol = token.v.symbol;
9789 label_t *label = get_label(symbol);
9791 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9792 statement->label.label = label;
9796 PUSH_PARENT(statement);
9798 /* if statement is already set then the label is defined twice,
9799 * otherwise it was just mentioned in a goto/local label declaration so far
9801 if (label->statement != NULL) {
9802 errorf(HERE, "duplicate label '%Y' (declared %P)",
9803 symbol, &label->base.source_position);
9805 label->base.source_position = token.source_position;
9806 label->statement = statement;
9811 if (token.type == '}') {
9812 /* TODO only warn? */
9813 if (warning.other && false) {
9814 warningf(HERE, "label at end of compound statement");
9815 statement->label.statement = create_empty_statement();
9817 errorf(HERE, "label at end of compound statement");
9818 statement->label.statement = create_invalid_statement();
9820 } else if (token.type == ';') {
9821 /* Eat an empty statement here, to avoid the warning about an empty
9822 * statement after a label. label:; is commonly used to have a label
9823 * before a closing brace. */
9824 statement->label.statement = create_empty_statement();
9827 statement_t *const inner_stmt = parse_statement();
9828 statement->label.statement = inner_stmt;
9829 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9830 errorf(&inner_stmt->base.source_position, "declaration after label");
9834 /* remember the labels in a list for later checking */
9835 *label_anchor = &statement->label;
9836 label_anchor = &statement->label.next;
9843 * Parse an if statement.
9845 static statement_t *parse_if(void)
9847 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9851 PUSH_PARENT(statement);
9853 add_anchor_token('{');
9856 add_anchor_token(')');
9857 expression_t *const expr = parse_expression();
9858 statement->ifs.condition = expr;
9859 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9861 semantic_condition(expr, "condition of 'if'-statment");
9862 mark_vars_read(expr, NULL);
9863 rem_anchor_token(')');
9867 rem_anchor_token('{');
9869 add_anchor_token(T_else);
9870 statement->ifs.true_statement = parse_statement();
9871 rem_anchor_token(T_else);
9873 if (token.type == T_else) {
9875 statement->ifs.false_statement = parse_statement();
9883 * Check that all enums are handled in a switch.
9885 * @param statement the switch statement to check
9887 static void check_enum_cases(const switch_statement_t *statement) {
9888 const type_t *type = skip_typeref(statement->expression->base.type);
9889 if (! is_type_enum(type))
9891 const enum_type_t *enumt = &type->enumt;
9893 /* if we have a default, no warnings */
9894 if (statement->default_label != NULL)
9897 /* FIXME: calculation of value should be done while parsing */
9898 /* TODO: quadratic algorithm here. Change to an n log n one */
9899 long last_value = -1;
9900 const entity_t *entry = enumt->enume->base.next;
9901 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9902 entry = entry->base.next) {
9903 const expression_t *expression = entry->enum_value.value;
9904 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9906 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9907 if (l->expression == NULL)
9909 if (l->first_case <= value && value <= l->last_case) {
9915 warningf(&statement->base.source_position,
9916 "enumeration value '%Y' not handled in switch",
9917 entry->base.symbol);
9924 * Parse a switch statement.
9926 static statement_t *parse_switch(void)
9928 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9932 PUSH_PARENT(statement);
9935 add_anchor_token(')');
9936 expression_t *const expr = parse_expression();
9937 mark_vars_read(expr, NULL);
9938 type_t * type = skip_typeref(expr->base.type);
9939 if (is_type_integer(type)) {
9940 type = promote_integer(type);
9941 if (warning.traditional) {
9942 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9943 warningf(&expr->base.source_position,
9944 "'%T' switch expression not converted to '%T' in ISO C",
9948 } else if (is_type_valid(type)) {
9949 errorf(&expr->base.source_position,
9950 "switch quantity is not an integer, but '%T'", type);
9951 type = type_error_type;
9953 statement->switchs.expression = create_implicit_cast(expr, type);
9955 rem_anchor_token(')');
9957 switch_statement_t *rem = current_switch;
9958 current_switch = &statement->switchs;
9959 statement->switchs.body = parse_statement();
9960 current_switch = rem;
9962 if (warning.switch_default &&
9963 statement->switchs.default_label == NULL) {
9964 warningf(&statement->base.source_position, "switch has no default case");
9966 if (warning.switch_enum)
9967 check_enum_cases(&statement->switchs);
9973 return create_invalid_statement();
9976 static statement_t *parse_loop_body(statement_t *const loop)
9978 statement_t *const rem = current_loop;
9979 current_loop = loop;
9981 statement_t *const body = parse_statement();
9988 * Parse a while statement.
9990 static statement_t *parse_while(void)
9992 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9996 PUSH_PARENT(statement);
9999 add_anchor_token(')');
10000 expression_t *const cond = parse_expression();
10001 statement->whiles.condition = cond;
10002 /* §6.8.5:2 The controlling expression of an iteration statement shall
10003 * have scalar type. */
10004 semantic_condition(cond, "condition of 'while'-statement");
10005 mark_vars_read(cond, NULL);
10006 rem_anchor_token(')');
10009 statement->whiles.body = parse_loop_body(statement);
10015 return create_invalid_statement();
10019 * Parse a do statement.
10021 static statement_t *parse_do(void)
10023 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10027 PUSH_PARENT(statement);
10029 add_anchor_token(T_while);
10030 statement->do_while.body = parse_loop_body(statement);
10031 rem_anchor_token(T_while);
10035 add_anchor_token(')');
10036 expression_t *const cond = parse_expression();
10037 statement->do_while.condition = cond;
10038 /* §6.8.5:2 The controlling expression of an iteration statement shall
10039 * have scalar type. */
10040 semantic_condition(cond, "condition of 'do-while'-statement");
10041 mark_vars_read(cond, NULL);
10042 rem_anchor_token(')');
10050 return create_invalid_statement();
10054 * Parse a for statement.
10056 static statement_t *parse_for(void)
10058 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10062 PUSH_PARENT(statement);
10064 size_t const top = environment_top();
10065 scope_t *old_scope = scope_push(&statement->fors.scope);
10068 add_anchor_token(')');
10070 if (token.type == ';') {
10072 } else if (is_declaration_specifier(&token, false)) {
10073 parse_declaration(record_entity, DECL_FLAGS_NONE);
10075 add_anchor_token(';');
10076 expression_t *const init = parse_expression();
10077 statement->fors.initialisation = init;
10078 mark_vars_read(init, ENT_ANY);
10079 if (warning.unused_value && !expression_has_effect(init)) {
10080 warningf(&init->base.source_position,
10081 "initialisation of 'for'-statement has no effect");
10083 rem_anchor_token(';');
10087 if (token.type != ';') {
10088 add_anchor_token(';');
10089 expression_t *const cond = parse_expression();
10090 statement->fors.condition = cond;
10091 /* §6.8.5:2 The controlling expression of an iteration statement
10092 * shall have scalar type. */
10093 semantic_condition(cond, "condition of 'for'-statement");
10094 mark_vars_read(cond, NULL);
10095 rem_anchor_token(';');
10098 if (token.type != ')') {
10099 expression_t *const step = parse_expression();
10100 statement->fors.step = step;
10101 mark_vars_read(step, ENT_ANY);
10102 if (warning.unused_value && !expression_has_effect(step)) {
10103 warningf(&step->base.source_position,
10104 "step of 'for'-statement has no effect");
10108 rem_anchor_token(')');
10109 statement->fors.body = parse_loop_body(statement);
10111 assert(current_scope == &statement->fors.scope);
10112 scope_pop(old_scope);
10113 environment_pop_to(top);
10120 rem_anchor_token(')');
10121 assert(current_scope == &statement->fors.scope);
10122 scope_pop(old_scope);
10123 environment_pop_to(top);
10125 return create_invalid_statement();
10129 * Parse a goto statement.
10131 static statement_t *parse_goto(void)
10133 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10136 if (GNU_MODE && token.type == '*') {
10138 expression_t *expression = parse_expression();
10139 mark_vars_read(expression, NULL);
10141 /* Argh: although documentation says the expression must be of type void*,
10142 * gcc accepts anything that can be casted into void* without error */
10143 type_t *type = expression->base.type;
10145 if (type != type_error_type) {
10146 if (!is_type_pointer(type) && !is_type_integer(type)) {
10147 errorf(&expression->base.source_position,
10148 "cannot convert to a pointer type");
10149 } else if (warning.other && type != type_void_ptr) {
10150 warningf(&expression->base.source_position,
10151 "type of computed goto expression should be 'void*' not '%T'", type);
10153 expression = create_implicit_cast(expression, type_void_ptr);
10156 statement->gotos.expression = expression;
10158 if (token.type != T_IDENTIFIER) {
10160 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10162 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10163 eat_until_anchor();
10166 symbol_t *symbol = token.v.symbol;
10169 statement->gotos.label = get_label(symbol);
10172 /* remember the goto's in a list for later checking */
10173 *goto_anchor = &statement->gotos;
10174 goto_anchor = &statement->gotos.next;
10180 return create_invalid_statement();
10184 * Parse a continue statement.
10186 static statement_t *parse_continue(void)
10188 if (current_loop == NULL) {
10189 errorf(HERE, "continue statement not within loop");
10192 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10202 * Parse a break statement.
10204 static statement_t *parse_break(void)
10206 if (current_switch == NULL && current_loop == NULL) {
10207 errorf(HERE, "break statement not within loop or switch");
10210 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10220 * Parse a __leave statement.
10222 static statement_t *parse_leave_statement(void)
10224 if (current_try == NULL) {
10225 errorf(HERE, "__leave statement not within __try");
10228 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10238 * Check if a given entity represents a local variable.
10240 static bool is_local_variable(const entity_t *entity)
10242 if (entity->kind != ENTITY_VARIABLE)
10245 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10246 case STORAGE_CLASS_AUTO:
10247 case STORAGE_CLASS_REGISTER: {
10248 const type_t *type = skip_typeref(entity->declaration.type);
10249 if (is_type_function(type)) {
10261 * Check if a given expression represents a local variable.
10263 static bool expression_is_local_variable(const expression_t *expression)
10265 if (expression->base.kind != EXPR_REFERENCE) {
10268 const entity_t *entity = expression->reference.entity;
10269 return is_local_variable(entity);
10273 * Check if a given expression represents a local variable and
10274 * return its declaration then, else return NULL.
10276 entity_t *expression_is_variable(const expression_t *expression)
10278 if (expression->base.kind != EXPR_REFERENCE) {
10281 entity_t *entity = expression->reference.entity;
10282 if (entity->kind != ENTITY_VARIABLE)
10289 * Parse a return statement.
10291 static statement_t *parse_return(void)
10295 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10297 expression_t *return_value = NULL;
10298 if (token.type != ';') {
10299 return_value = parse_expression();
10300 mark_vars_read(return_value, NULL);
10303 const type_t *const func_type = skip_typeref(current_function->base.type);
10304 assert(is_type_function(func_type));
10305 type_t *const return_type = skip_typeref(func_type->function.return_type);
10307 if (return_value != NULL) {
10308 type_t *return_value_type = skip_typeref(return_value->base.type);
10310 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) &&
10311 !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10312 if (warning.other) {
10313 warningf(&statement->base.source_position,
10314 "'return' with a value, in function returning void");
10316 return_value = NULL;
10318 assign_error_t error = semantic_assign(return_type, return_value);
10319 report_assign_error(error, return_type, return_value, "'return'",
10320 &statement->base.source_position);
10321 return_value = create_implicit_cast(return_value, return_type);
10323 /* check for returning address of a local var */
10324 if (warning.other && return_value != NULL
10325 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10326 const expression_t *expression = return_value->unary.value;
10327 if (expression_is_local_variable(expression)) {
10328 warningf(&statement->base.source_position,
10329 "function returns address of local variable");
10332 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10333 warningf(&statement->base.source_position,
10334 "'return' without value, in function returning non-void");
10336 statement->returns.value = return_value;
10345 * Parse a declaration statement.
10347 static statement_t *parse_declaration_statement(void)
10349 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10351 entity_t *before = current_scope->last_entity;
10353 parse_external_declaration();
10355 parse_declaration(record_entity, DECL_FLAGS_NONE);
10358 if (before == NULL) {
10359 statement->declaration.declarations_begin = current_scope->entities;
10361 statement->declaration.declarations_begin = before->base.next;
10363 statement->declaration.declarations_end = current_scope->last_entity;
10369 * Parse an expression statement, ie. expr ';'.
10371 static statement_t *parse_expression_statement(void)
10373 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10375 expression_t *const expr = parse_expression();
10376 statement->expression.expression = expr;
10377 mark_vars_read(expr, ENT_ANY);
10386 * Parse a microsoft __try { } __finally { } or
10387 * __try{ } __except() { }
10389 static statement_t *parse_ms_try_statment(void)
10391 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10394 PUSH_PARENT(statement);
10396 ms_try_statement_t *rem = current_try;
10397 current_try = &statement->ms_try;
10398 statement->ms_try.try_statement = parse_compound_statement(false);
10403 if (token.type == T___except) {
10406 add_anchor_token(')');
10407 expression_t *const expr = parse_expression();
10408 mark_vars_read(expr, NULL);
10409 type_t * type = skip_typeref(expr->base.type);
10410 if (is_type_integer(type)) {
10411 type = promote_integer(type);
10412 } else if (is_type_valid(type)) {
10413 errorf(&expr->base.source_position,
10414 "__expect expression is not an integer, but '%T'", type);
10415 type = type_error_type;
10417 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10418 rem_anchor_token(')');
10420 statement->ms_try.final_statement = parse_compound_statement(false);
10421 } else if (token.type == T__finally) {
10423 statement->ms_try.final_statement = parse_compound_statement(false);
10425 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10426 return create_invalid_statement();
10430 return create_invalid_statement();
10433 static statement_t *parse_empty_statement(void)
10435 if (warning.empty_statement) {
10436 warningf(HERE, "statement is empty");
10438 statement_t *const statement = create_empty_statement();
10443 static statement_t *parse_local_label_declaration(void)
10445 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10449 entity_t *begin = NULL, *end = NULL;
10452 if (token.type != T_IDENTIFIER) {
10453 parse_error_expected("while parsing local label declaration",
10454 T_IDENTIFIER, NULL);
10457 symbol_t *symbol = token.v.symbol;
10458 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10459 if (entity != NULL && entity->base.parent_scope == current_scope) {
10460 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10461 symbol, &entity->base.source_position);
10463 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10465 entity->base.parent_scope = current_scope;
10466 entity->base.namespc = NAMESPACE_LABEL;
10467 entity->base.source_position = token.source_position;
10468 entity->base.symbol = symbol;
10471 end->base.next = entity;
10476 environment_push(entity);
10480 if (token.type != ',')
10486 statement->declaration.declarations_begin = begin;
10487 statement->declaration.declarations_end = end;
10491 static void parse_namespace_definition(void)
10495 entity_t *entity = NULL;
10496 symbol_t *symbol = NULL;
10498 if (token.type == T_IDENTIFIER) {
10499 symbol = token.v.symbol;
10502 entity = get_entity(symbol, NAMESPACE_NORMAL);
10503 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10504 && entity->base.parent_scope == current_scope) {
10505 error_redefined_as_different_kind(&token.source_position,
10506 entity, ENTITY_NAMESPACE);
10511 if (entity == NULL) {
10512 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10513 entity->base.symbol = symbol;
10514 entity->base.source_position = token.source_position;
10515 entity->base.namespc = NAMESPACE_NORMAL;
10516 entity->base.parent_scope = current_scope;
10519 if (token.type == '=') {
10520 /* TODO: parse namespace alias */
10521 panic("namespace alias definition not supported yet");
10524 environment_push(entity);
10525 append_entity(current_scope, entity);
10527 size_t const top = environment_top();
10528 scope_t *old_scope = scope_push(&entity->namespacee.members);
10535 assert(current_scope == &entity->namespacee.members);
10536 scope_pop(old_scope);
10537 environment_pop_to(top);
10541 * Parse a statement.
10542 * There's also parse_statement() which additionally checks for
10543 * "statement has no effect" warnings
10545 static statement_t *intern_parse_statement(void)
10547 statement_t *statement = NULL;
10549 /* declaration or statement */
10550 add_anchor_token(';');
10551 switch (token.type) {
10552 case T_IDENTIFIER: {
10553 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10554 if (la1_type == ':') {
10555 statement = parse_label_statement();
10556 } else if (is_typedef_symbol(token.v.symbol)) {
10557 statement = parse_declaration_statement();
10559 /* it's an identifier, the grammar says this must be an
10560 * expression statement. However it is common that users mistype
10561 * declaration types, so we guess a bit here to improve robustness
10562 * for incorrect programs */
10563 switch (la1_type) {
10566 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10567 goto expression_statment;
10572 statement = parse_declaration_statement();
10576 expression_statment:
10577 statement = parse_expression_statement();
10584 case T___extension__:
10585 /* This can be a prefix to a declaration or an expression statement.
10586 * We simply eat it now and parse the rest with tail recursion. */
10589 } while (token.type == T___extension__);
10590 bool old_gcc_extension = in_gcc_extension;
10591 in_gcc_extension = true;
10592 statement = intern_parse_statement();
10593 in_gcc_extension = old_gcc_extension;
10597 statement = parse_declaration_statement();
10601 statement = parse_local_label_declaration();
10604 case ';': statement = parse_empty_statement(); break;
10605 case '{': statement = parse_compound_statement(false); break;
10606 case T___leave: statement = parse_leave_statement(); break;
10607 case T___try: statement = parse_ms_try_statment(); break;
10608 case T_asm: statement = parse_asm_statement(); break;
10609 case T_break: statement = parse_break(); break;
10610 case T_case: statement = parse_case_statement(); break;
10611 case T_continue: statement = parse_continue(); break;
10612 case T_default: statement = parse_default_statement(); break;
10613 case T_do: statement = parse_do(); break;
10614 case T_for: statement = parse_for(); break;
10615 case T_goto: statement = parse_goto(); break;
10616 case T_if: statement = parse_if(); break;
10617 case T_return: statement = parse_return(); break;
10618 case T_switch: statement = parse_switch(); break;
10619 case T_while: statement = parse_while(); break;
10622 statement = parse_expression_statement();
10626 errorf(HERE, "unexpected token '%K' while parsing statement", &token);
10627 statement = create_invalid_statement();
10632 rem_anchor_token(';');
10634 assert(statement != NULL
10635 && statement->base.source_position.input_name != NULL);
10641 * parse a statement and emits "statement has no effect" warning if needed
10642 * (This is really a wrapper around intern_parse_statement with check for 1
10643 * single warning. It is needed, because for statement expressions we have
10644 * to avoid the warning on the last statement)
10646 static statement_t *parse_statement(void)
10648 statement_t *statement = intern_parse_statement();
10650 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10651 expression_t *expression = statement->expression.expression;
10652 if (!expression_has_effect(expression)) {
10653 warningf(&expression->base.source_position,
10654 "statement has no effect");
10662 * Parse a compound statement.
10664 static statement_t *parse_compound_statement(bool inside_expression_statement)
10666 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10668 PUSH_PARENT(statement);
10671 add_anchor_token('}');
10673 size_t const top = environment_top();
10674 scope_t *old_scope = scope_push(&statement->compound.scope);
10676 statement_t **anchor = &statement->compound.statements;
10677 bool only_decls_so_far = true;
10678 while (token.type != '}') {
10679 if (token.type == T_EOF) {
10680 errorf(&statement->base.source_position,
10681 "EOF while parsing compound statement");
10684 statement_t *sub_statement = intern_parse_statement();
10685 if (is_invalid_statement(sub_statement)) {
10686 /* an error occurred. if we are at an anchor, return */
10692 if (warning.declaration_after_statement) {
10693 if (sub_statement->kind != STATEMENT_DECLARATION) {
10694 only_decls_so_far = false;
10695 } else if (!only_decls_so_far) {
10696 warningf(&sub_statement->base.source_position,
10697 "ISO C90 forbids mixed declarations and code");
10701 *anchor = sub_statement;
10703 while (sub_statement->base.next != NULL)
10704 sub_statement = sub_statement->base.next;
10706 anchor = &sub_statement->base.next;
10710 /* look over all statements again to produce no effect warnings */
10711 if (warning.unused_value) {
10712 statement_t *sub_statement = statement->compound.statements;
10713 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10714 if (sub_statement->kind != STATEMENT_EXPRESSION)
10716 /* don't emit a warning for the last expression in an expression
10717 * statement as it has always an effect */
10718 if (inside_expression_statement && sub_statement->base.next == NULL)
10721 expression_t *expression = sub_statement->expression.expression;
10722 if (!expression_has_effect(expression)) {
10723 warningf(&expression->base.source_position,
10724 "statement has no effect");
10730 rem_anchor_token('}');
10731 assert(current_scope == &statement->compound.scope);
10732 scope_pop(old_scope);
10733 environment_pop_to(top);
10740 * Check for unused global static functions and variables
10742 static void check_unused_globals(void)
10744 if (!warning.unused_function && !warning.unused_variable)
10747 for (const entity_t *entity = file_scope->entities; entity != NULL;
10748 entity = entity->base.next) {
10749 if (!is_declaration(entity))
10752 const declaration_t *declaration = &entity->declaration;
10753 if (declaration->used ||
10754 declaration->modifiers & DM_UNUSED ||
10755 declaration->modifiers & DM_USED ||
10756 declaration->storage_class != STORAGE_CLASS_STATIC)
10759 type_t *const type = declaration->type;
10761 if (entity->kind == ENTITY_FUNCTION) {
10762 /* inhibit warning for static inline functions */
10763 if (entity->function.is_inline)
10766 s = entity->function.statement != NULL ? "defined" : "declared";
10771 warningf(&declaration->base.source_position, "'%#T' %s but not used",
10772 type, declaration->base.symbol, s);
10776 static void parse_global_asm(void)
10778 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10783 statement->asms.asm_text = parse_string_literals();
10784 statement->base.next = unit->global_asm;
10785 unit->global_asm = statement;
10793 static void parse_linkage_specification(void)
10796 assert(token.type == T_STRING_LITERAL);
10798 const char *linkage = parse_string_literals().begin;
10800 linkage_kind_t old_linkage = current_linkage;
10801 linkage_kind_t new_linkage;
10802 if (strcmp(linkage, "C") == 0) {
10803 new_linkage = LINKAGE_C;
10804 } else if (strcmp(linkage, "C++") == 0) {
10805 new_linkage = LINKAGE_CXX;
10807 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
10808 new_linkage = LINKAGE_INVALID;
10810 current_linkage = new_linkage;
10812 if (token.type == '{') {
10821 assert(current_linkage == new_linkage);
10822 current_linkage = old_linkage;
10825 static void parse_external(void)
10827 switch (token.type) {
10828 DECLARATION_START_NO_EXTERN
10830 case T___extension__:
10831 /* tokens below are for implicit int */
10832 case '&': /* & x; -> int& x; (and error later, because C++ has no
10834 case '*': /* * x; -> int* x; */
10835 case '(': /* (x); -> int (x); */
10836 parse_external_declaration();
10840 if (look_ahead(1)->type == T_STRING_LITERAL) {
10841 parse_linkage_specification();
10843 parse_external_declaration();
10848 parse_global_asm();
10852 parse_namespace_definition();
10856 if (!strict_mode) {
10858 warningf(HERE, "stray ';' outside of function");
10865 errorf(HERE, "stray '%K' outside of function", &token);
10866 if (token.type == '(' || token.type == '{' || token.type == '[')
10867 eat_until_matching_token(token.type);
10873 static void parse_externals(void)
10875 add_anchor_token('}');
10876 add_anchor_token(T_EOF);
10879 unsigned char token_anchor_copy[T_LAST_TOKEN];
10880 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10883 while (token.type != T_EOF && token.type != '}') {
10885 bool anchor_leak = false;
10886 for (int i = 0; i != T_LAST_TOKEN; ++i) {
10887 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10889 errorf(HERE, "Leaked anchor token %k %d times", i, count);
10890 anchor_leak = true;
10893 if (in_gcc_extension) {
10894 errorf(HERE, "Leaked __extension__");
10895 anchor_leak = true;
10905 rem_anchor_token(T_EOF);
10906 rem_anchor_token('}');
10910 * Parse a translation unit.
10912 static void parse_translation_unit(void)
10914 add_anchor_token(T_EOF);
10919 if (token.type == T_EOF)
10922 errorf(HERE, "stray '%K' outside of function", &token);
10923 if (token.type == '(' || token.type == '{' || token.type == '[')
10924 eat_until_matching_token(token.type);
10932 * @return the translation unit or NULL if errors occurred.
10934 void start_parsing(void)
10936 environment_stack = NEW_ARR_F(stack_entry_t, 0);
10937 label_stack = NEW_ARR_F(stack_entry_t, 0);
10938 diagnostic_count = 0;
10942 type_set_output(stderr);
10943 ast_set_output(stderr);
10945 assert(unit == NULL);
10946 unit = allocate_ast_zero(sizeof(unit[0]));
10948 assert(file_scope == NULL);
10949 file_scope = &unit->scope;
10951 assert(current_scope == NULL);
10952 scope_push(&unit->scope);
10955 translation_unit_t *finish_parsing(void)
10957 assert(current_scope == &unit->scope);
10960 assert(file_scope == &unit->scope);
10961 check_unused_globals();
10964 DEL_ARR_F(environment_stack);
10965 DEL_ARR_F(label_stack);
10967 translation_unit_t *result = unit;
10974 lookahead_bufpos = 0;
10975 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10978 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
10979 parse_translation_unit();
10983 * Initialize the parser.
10985 void init_parser(void)
10987 sym_anonymous = symbol_table_insert("<anonymous>");
10989 if (c_mode & _MS) {
10990 /* add predefined symbols for extended-decl-modifier */
10991 sym_align = symbol_table_insert("align");
10992 sym_allocate = symbol_table_insert("allocate");
10993 sym_dllimport = symbol_table_insert("dllimport");
10994 sym_dllexport = symbol_table_insert("dllexport");
10995 sym_naked = symbol_table_insert("naked");
10996 sym_noinline = symbol_table_insert("noinline");
10997 sym_noreturn = symbol_table_insert("noreturn");
10998 sym_nothrow = symbol_table_insert("nothrow");
10999 sym_novtable = symbol_table_insert("novtable");
11000 sym_property = symbol_table_insert("property");
11001 sym_get = symbol_table_insert("get");
11002 sym_put = symbol_table_insert("put");
11003 sym_selectany = symbol_table_insert("selectany");
11004 sym_thread = symbol_table_insert("thread");
11005 sym_uuid = symbol_table_insert("uuid");
11006 sym_deprecated = symbol_table_insert("deprecated");
11007 sym_restrict = symbol_table_insert("restrict");
11008 sym_noalias = symbol_table_insert("noalias");
11010 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11012 init_expression_parsers();
11013 obstack_init(&temp_obst);
11015 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11016 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11020 * Terminate the parser.
11022 void exit_parser(void)
11024 obstack_free(&temp_obst, NULL);