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;
4981 assert(entity->declaration.type != NULL);
4983 declaration_t *const previous_declaration
4984 = &previous_entity->declaration;
4985 declaration_t *const declaration = &entity->declaration;
4986 type_t *const orig_type = entity->declaration.type;
4987 type_t *const type = skip_typeref(orig_type);
4989 type_t *prev_type = skip_typeref(previous_declaration->type);
4991 if (!types_compatible(type, prev_type)) {
4993 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4994 orig_type, symbol, previous_declaration->type, symbol,
4995 &previous_entity->base.source_position);
4997 unsigned old_storage_class = previous_declaration->storage_class;
4998 if (warning.redundant_decls && is_definition
4999 && previous_declaration->storage_class == STORAGE_CLASS_STATIC
5000 && !(previous_declaration->modifiers & DM_USED)
5001 && !previous_declaration->used) {
5002 warningf(&previous_entity->base.source_position,
5003 "unnecessary static forward declaration for '%#T'",
5004 previous_declaration->type, symbol);
5007 unsigned new_storage_class = declaration->storage_class;
5008 if (is_type_incomplete(prev_type)) {
5009 previous_declaration->type = type;
5013 /* pretend no storage class means extern for function
5014 * declarations (except if the previous declaration is neither
5015 * none nor extern) */
5016 if (entity->kind == ENTITY_FUNCTION) {
5017 if (prev_type->function.unspecified_parameters) {
5018 previous_declaration->type = type;
5022 switch (old_storage_class) {
5023 case STORAGE_CLASS_NONE:
5024 old_storage_class = STORAGE_CLASS_EXTERN;
5027 case STORAGE_CLASS_EXTERN:
5028 if (is_definition) {
5029 if (warning.missing_prototypes &&
5030 prev_type->function.unspecified_parameters &&
5031 !is_sym_main(symbol)) {
5032 warningf(pos, "no previous prototype for '%#T'",
5035 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5036 new_storage_class = STORAGE_CLASS_EXTERN;
5045 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5046 new_storage_class == STORAGE_CLASS_EXTERN) {
5047 warn_redundant_declaration:
5048 if (!is_definition &&
5049 warning.redundant_decls &&
5050 is_type_valid(prev_type) &&
5051 strcmp(previous_entity->base.source_position.input_name,
5052 "<builtin>") != 0) {
5054 "redundant declaration for '%Y' (declared %P)",
5055 symbol, &previous_entity->base.source_position);
5057 } else if (current_function == NULL) {
5058 if (old_storage_class != STORAGE_CLASS_STATIC &&
5059 new_storage_class == STORAGE_CLASS_STATIC) {
5061 "static declaration of '%Y' follows non-static declaration (declared %P)",
5062 symbol, &previous_entity->base.source_position);
5063 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5064 previous_declaration->storage_class = STORAGE_CLASS_NONE;
5065 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
5067 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5069 goto error_redeclaration;
5070 goto warn_redundant_declaration;
5072 } else if (is_type_valid(prev_type)) {
5073 if (old_storage_class == new_storage_class) {
5074 error_redeclaration:
5075 errorf(pos, "redeclaration of '%Y' (declared %P)",
5076 symbol, &previous_entity->base.source_position);
5079 "redeclaration of '%Y' with different linkage (declared %P)",
5080 symbol, &previous_entity->base.source_position);
5085 previous_declaration->modifiers |= declaration->modifiers;
5086 if (entity->kind == ENTITY_FUNCTION) {
5087 previous_entity->function.is_inline |= entity->function.is_inline;
5089 return previous_entity;
5092 if (entity->kind == ENTITY_FUNCTION) {
5093 if (is_definition &&
5094 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5095 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5096 warningf(pos, "no previous prototype for '%#T'",
5097 entity->declaration.type, symbol);
5098 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5099 warningf(pos, "no previous declaration for '%#T'",
5100 entity->declaration.type, symbol);
5103 } else if (warning.missing_declarations
5104 && entity->kind == ENTITY_VARIABLE
5105 && current_scope == file_scope) {
5106 declaration_t *declaration = &entity->declaration;
5107 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5108 warningf(pos, "no previous declaration for '%#T'",
5109 declaration->type, symbol);
5114 assert(entity->base.parent_scope == NULL);
5115 assert(current_scope != NULL);
5117 entity->base.parent_scope = current_scope;
5118 entity->base.namespc = NAMESPACE_NORMAL;
5119 environment_push(entity);
5120 append_entity(current_scope, entity);
5125 static void parser_error_multiple_definition(entity_t *entity,
5126 const source_position_t *source_position)
5128 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
5129 entity->base.symbol, &entity->base.source_position);
5132 static bool is_declaration_specifier(const token_t *token,
5133 bool only_specifiers_qualifiers)
5135 switch (token->type) {
5140 return is_typedef_symbol(token->v.symbol);
5142 case T___extension__:
5144 return !only_specifiers_qualifiers;
5151 static void parse_init_declarator_rest(entity_t *entity)
5153 assert(is_declaration(entity));
5154 declaration_t *const declaration = &entity->declaration;
5158 type_t *orig_type = declaration->type;
5159 type_t *type = skip_typeref(orig_type);
5161 if (entity->kind == ENTITY_VARIABLE
5162 && entity->variable.initializer != NULL) {
5163 parser_error_multiple_definition(entity, HERE);
5166 bool must_be_constant = false;
5167 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5168 entity->base.parent_scope == file_scope) {
5169 must_be_constant = true;
5172 if (is_type_function(type)) {
5173 errorf(&entity->base.source_position,
5174 "function '%#T' is initialized like a variable",
5175 orig_type, entity->base.symbol);
5176 orig_type = type_error_type;
5179 parse_initializer_env_t env;
5180 env.type = orig_type;
5181 env.must_be_constant = must_be_constant;
5182 env.entity = entity;
5183 current_init_decl = entity;
5185 initializer_t *initializer = parse_initializer(&env);
5186 current_init_decl = NULL;
5188 if (entity->kind == ENTITY_VARIABLE) {
5189 /* § 6.7.5 (22) array initializers for arrays with unknown size
5190 * determine the array type size */
5191 declaration->type = env.type;
5192 entity->variable.initializer = initializer;
5196 /* parse rest of a declaration without any declarator */
5197 static void parse_anonymous_declaration_rest(
5198 const declaration_specifiers_t *specifiers)
5201 anonymous_entity = NULL;
5203 if (warning.other) {
5204 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5205 specifiers->thread_local) {
5206 warningf(&specifiers->source_position,
5207 "useless storage class in empty declaration");
5210 type_t *type = specifiers->type;
5211 switch (type->kind) {
5212 case TYPE_COMPOUND_STRUCT:
5213 case TYPE_COMPOUND_UNION: {
5214 if (type->compound.compound->base.symbol == NULL) {
5215 warningf(&specifiers->source_position,
5216 "unnamed struct/union that defines no instances");
5225 warningf(&specifiers->source_position, "empty declaration");
5231 static void check_variable_type_complete(entity_t *ent)
5233 if (ent->kind != ENTITY_VARIABLE)
5236 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5237 * type for the object shall be complete [...] */
5238 declaration_t *decl = &ent->declaration;
5239 if (decl->storage_class != STORAGE_CLASS_NONE)
5242 type_t *type = decl->type;
5243 if (!is_type_incomplete(skip_typeref(type)))
5246 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5247 type, ent->base.symbol);
5251 static void parse_declaration_rest(entity_t *ndeclaration,
5252 const declaration_specifiers_t *specifiers,
5253 parsed_declaration_func finished_declaration,
5254 declarator_flags_t flags)
5256 add_anchor_token(';');
5257 add_anchor_token(',');
5259 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5261 if (token.type == '=') {
5262 parse_init_declarator_rest(entity);
5263 } else if (entity->kind == ENTITY_VARIABLE) {
5264 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5265 * [...] where the extern specifier is explicitly used. */
5266 declaration_t *decl = &entity->declaration;
5267 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5268 type_t *type = decl->type;
5269 if (is_type_reference(skip_typeref(type))) {
5270 errorf(&entity->base.source_position,
5271 "reference '%#T' must be initialized",
5272 type, entity->base.symbol);
5277 check_variable_type_complete(entity);
5279 if (token.type != ',')
5283 add_anchor_token('=');
5284 ndeclaration = parse_declarator(specifiers, flags);
5285 rem_anchor_token('=');
5290 anonymous_entity = NULL;
5291 rem_anchor_token(';');
5292 rem_anchor_token(',');
5295 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5297 symbol_t *symbol = entity->base.symbol;
5298 if (symbol == NULL) {
5299 errorf(HERE, "anonymous declaration not valid as function parameter");
5303 assert(entity->base.namespc == NAMESPACE_NORMAL);
5304 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5305 if (previous_entity == NULL
5306 || previous_entity->base.parent_scope != current_scope) {
5307 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5312 if (is_definition) {
5313 errorf(HERE, "parameter %Y is initialised", entity->base.symbol);
5316 return record_entity(entity, false);
5319 static void parse_declaration(parsed_declaration_func finished_declaration,
5320 declarator_flags_t flags)
5322 declaration_specifiers_t specifiers;
5323 memset(&specifiers, 0, sizeof(specifiers));
5325 add_anchor_token(';');
5326 parse_declaration_specifiers(&specifiers);
5327 rem_anchor_token(';');
5329 if (token.type == ';') {
5330 parse_anonymous_declaration_rest(&specifiers);
5332 entity_t *entity = parse_declarator(&specifiers, flags);
5333 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5337 static type_t *get_default_promoted_type(type_t *orig_type)
5339 type_t *result = orig_type;
5341 type_t *type = skip_typeref(orig_type);
5342 if (is_type_integer(type)) {
5343 result = promote_integer(type);
5344 } else if (type == type_float) {
5345 result = type_double;
5351 static void parse_kr_declaration_list(entity_t *entity)
5353 if (entity->kind != ENTITY_FUNCTION)
5356 type_t *type = skip_typeref(entity->declaration.type);
5357 assert(is_type_function(type));
5358 if (!type->function.kr_style_parameters)
5362 add_anchor_token('{');
5364 /* push function parameters */
5365 size_t const top = environment_top();
5366 scope_t *old_scope = scope_push(&entity->function.parameters);
5368 entity_t *parameter = entity->function.parameters.entities;
5369 for ( ; parameter != NULL; parameter = parameter->base.next) {
5370 assert(parameter->base.parent_scope == NULL);
5371 parameter->base.parent_scope = current_scope;
5372 environment_push(parameter);
5375 /* parse declaration list */
5377 switch (token.type) {
5379 case T___extension__:
5380 /* This covers symbols, which are no type, too, and results in
5381 * better error messages. The typical cases are misspelled type
5382 * names and missing includes. */
5384 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5392 /* pop function parameters */
5393 assert(current_scope == &entity->function.parameters);
5394 scope_pop(old_scope);
5395 environment_pop_to(top);
5397 /* update function type */
5398 type_t *new_type = duplicate_type(type);
5400 function_parameter_t *parameters = NULL;
5401 function_parameter_t *last_parameter = NULL;
5403 parameter = entity->function.parameters.entities;
5404 for (; parameter != NULL; parameter = parameter->base.next) {
5405 type_t *parameter_type = parameter->declaration.type;
5406 if (parameter_type == NULL) {
5408 errorf(HERE, "no type specified for function parameter '%Y'",
5409 parameter->base.symbol);
5411 if (warning.implicit_int) {
5412 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5413 parameter->base.symbol);
5415 parameter_type = type_int;
5416 parameter->declaration.type = parameter_type;
5420 semantic_parameter_incomplete(parameter);
5421 parameter_type = parameter->declaration.type;
5424 * we need the default promoted types for the function type
5426 parameter_type = get_default_promoted_type(parameter_type);
5428 function_parameter_t *function_parameter
5429 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5430 memset(function_parameter, 0, sizeof(function_parameter[0]));
5432 function_parameter->type = parameter_type;
5433 if (last_parameter != NULL) {
5434 last_parameter->next = function_parameter;
5436 parameters = function_parameter;
5438 last_parameter = function_parameter;
5441 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5443 new_type->function.parameters = parameters;
5444 new_type->function.unspecified_parameters = true;
5446 type = typehash_insert(new_type);
5447 if (type != new_type) {
5448 obstack_free(type_obst, new_type);
5451 entity->declaration.type = type;
5453 rem_anchor_token('{');
5456 static bool first_err = true;
5459 * When called with first_err set, prints the name of the current function,
5462 static void print_in_function(void)
5466 diagnosticf("%s: In function '%Y':\n",
5467 current_function->base.base.source_position.input_name,
5468 current_function->base.base.symbol);
5473 * Check if all labels are defined in the current function.
5474 * Check if all labels are used in the current function.
5476 static void check_labels(void)
5478 for (const goto_statement_t *goto_statement = goto_first;
5479 goto_statement != NULL;
5480 goto_statement = goto_statement->next) {
5481 /* skip computed gotos */
5482 if (goto_statement->expression != NULL)
5485 label_t *label = goto_statement->label;
5488 if (label->base.source_position.input_name == NULL) {
5489 print_in_function();
5490 errorf(&goto_statement->base.source_position,
5491 "label '%Y' used but not defined", label->base.symbol);
5495 if (warning.unused_label) {
5496 for (const label_statement_t *label_statement = label_first;
5497 label_statement != NULL;
5498 label_statement = label_statement->next) {
5499 label_t *label = label_statement->label;
5501 if (! label->used) {
5502 print_in_function();
5503 warningf(&label_statement->base.source_position,
5504 "label '%Y' defined but not used", label->base.symbol);
5510 static void warn_unused_entity(entity_t *entity, entity_t *end)
5512 for (; entity != NULL; entity = entity->base.next) {
5513 if (!is_declaration(entity))
5516 declaration_t *declaration = &entity->declaration;
5517 if (declaration->implicit)
5520 if (!declaration->used) {
5521 print_in_function();
5522 const char *what = get_entity_kind_name(entity->kind);
5523 warningf(&entity->base.source_position, "%s '%Y' is unused",
5524 what, entity->base.symbol);
5525 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5526 print_in_function();
5527 const char *what = get_entity_kind_name(entity->kind);
5528 warningf(&entity->base.source_position, "%s '%Y' is never read",
5529 what, entity->base.symbol);
5537 static void check_unused_variables(statement_t *const stmt, void *const env)
5541 switch (stmt->kind) {
5542 case STATEMENT_DECLARATION: {
5543 declaration_statement_t const *const decls = &stmt->declaration;
5544 warn_unused_entity(decls->declarations_begin,
5545 decls->declarations_end);
5550 warn_unused_entity(stmt->fors.scope.entities, NULL);
5559 * Check declarations of current_function for unused entities.
5561 static void check_declarations(void)
5563 if (warning.unused_parameter) {
5564 const scope_t *scope = ¤t_function->parameters;
5566 /* do not issue unused warnings for main */
5567 if (!is_sym_main(current_function->base.base.symbol)) {
5568 warn_unused_entity(scope->entities, NULL);
5571 if (warning.unused_variable) {
5572 walk_statements(current_function->statement, check_unused_variables,
5577 static int determine_truth(expression_t const* const cond)
5580 !is_constant_expression(cond) ? 0 :
5581 fold_constant(cond) != 0 ? 1 :
5585 static void check_reachable(statement_t *);
5587 static bool expression_returns(expression_t const *const expr)
5589 switch (expr->kind) {
5591 expression_t const *const func = expr->call.function;
5592 if (func->kind == EXPR_REFERENCE) {
5593 entity_t *entity = func->reference.entity;
5594 if (entity->kind == ENTITY_FUNCTION
5595 && entity->declaration.modifiers & DM_NORETURN)
5599 if (!expression_returns(func))
5602 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5603 if (!expression_returns(arg->expression))
5610 case EXPR_REFERENCE:
5611 case EXPR_REFERENCE_ENUM_VALUE:
5613 case EXPR_CHARACTER_CONSTANT:
5614 case EXPR_WIDE_CHARACTER_CONSTANT:
5615 case EXPR_STRING_LITERAL:
5616 case EXPR_WIDE_STRING_LITERAL:
5617 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5618 case EXPR_LABEL_ADDRESS:
5619 case EXPR_CLASSIFY_TYPE:
5620 case EXPR_SIZEOF: // TODO handle obscure VLA case
5623 case EXPR_BUILTIN_SYMBOL:
5624 case EXPR_BUILTIN_CONSTANT_P:
5625 case EXPR_BUILTIN_PREFETCH:
5630 case EXPR_STATEMENT:
5631 check_reachable(expr->statement.statement);
5632 // TODO check if statement can be left
5635 case EXPR_CONDITIONAL:
5636 // TODO handle constant expression
5638 if (!expression_returns(expr->conditional.condition))
5641 if (expr->conditional.true_expression != NULL
5642 && expression_returns(expr->conditional.true_expression))
5645 return expression_returns(expr->conditional.false_expression);
5648 return expression_returns(expr->select.compound);
5650 case EXPR_ARRAY_ACCESS:
5652 expression_returns(expr->array_access.array_ref) &&
5653 expression_returns(expr->array_access.index);
5656 return expression_returns(expr->va_starte.ap);
5659 return expression_returns(expr->va_arge.ap);
5661 EXPR_UNARY_CASES_MANDATORY
5662 return expression_returns(expr->unary.value);
5664 case EXPR_UNARY_THROW:
5668 // TODO handle constant lhs of && and ||
5670 expression_returns(expr->binary.left) &&
5671 expression_returns(expr->binary.right);
5677 panic("unhandled expression");
5680 static bool initializer_returns(initializer_t const *const init)
5682 switch (init->kind) {
5683 case INITIALIZER_VALUE:
5684 return expression_returns(init->value.value);
5686 case INITIALIZER_LIST: {
5687 initializer_t * const* i = init->list.initializers;
5688 initializer_t * const* const end = i + init->list.len;
5689 bool returns = true;
5690 for (; i != end; ++i) {
5691 if (!initializer_returns(*i))
5697 case INITIALIZER_STRING:
5698 case INITIALIZER_WIDE_STRING:
5699 case INITIALIZER_DESIGNATOR: // designators have no payload
5702 panic("unhandled initializer");
5705 static bool noreturn_candidate;
5707 static void check_reachable(statement_t *const stmt)
5709 if (stmt->base.reachable)
5711 if (stmt->kind != STATEMENT_DO_WHILE)
5712 stmt->base.reachable = true;
5714 statement_t *last = stmt;
5716 switch (stmt->kind) {
5717 case STATEMENT_INVALID:
5718 case STATEMENT_EMPTY:
5719 case STATEMENT_LOCAL_LABEL:
5721 next = stmt->base.next;
5724 case STATEMENT_DECLARATION: {
5725 declaration_statement_t const *const decl = &stmt->declaration;
5726 entity_t const * ent = decl->declarations_begin;
5727 entity_t const *const last = decl->declarations_end;
5728 for (;; ent = ent->base.next) {
5729 if (ent->kind == ENTITY_VARIABLE &&
5730 ent->variable.initializer != NULL &&
5731 !initializer_returns(ent->variable.initializer)) {
5737 next = stmt->base.next;
5741 case STATEMENT_COMPOUND:
5742 next = stmt->compound.statements;
5745 case STATEMENT_RETURN: {
5746 expression_t const *const val = stmt->returns.value;
5747 if (val == NULL || expression_returns(val))
5748 noreturn_candidate = false;
5752 case STATEMENT_IF: {
5753 if_statement_t const *const ifs = &stmt->ifs;
5754 expression_t const *const cond = ifs->condition;
5756 if (!expression_returns(cond))
5759 int const val = determine_truth(cond);
5762 check_reachable(ifs->true_statement);
5767 if (ifs->false_statement != NULL) {
5768 check_reachable(ifs->false_statement);
5772 next = stmt->base.next;
5776 case STATEMENT_SWITCH: {
5777 switch_statement_t const *const switchs = &stmt->switchs;
5778 expression_t const *const expr = switchs->expression;
5780 if (!expression_returns(expr))
5783 if (is_constant_expression(expr)) {
5784 long const val = fold_constant(expr);
5785 case_label_statement_t * defaults = NULL;
5786 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5787 if (i->expression == NULL) {
5792 if (i->first_case <= val && val <= i->last_case) {
5793 check_reachable((statement_t*)i);
5798 if (defaults != NULL) {
5799 check_reachable((statement_t*)defaults);
5803 bool has_default = false;
5804 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5805 if (i->expression == NULL)
5808 check_reachable((statement_t*)i);
5815 next = stmt->base.next;
5819 case STATEMENT_EXPRESSION: {
5820 /* Check for noreturn function call */
5821 expression_t const *const expr = stmt->expression.expression;
5822 if (!expression_returns(expr))
5825 next = stmt->base.next;
5829 case STATEMENT_CONTINUE: {
5830 statement_t *parent = stmt;
5832 parent = parent->base.parent;
5833 if (parent == NULL) /* continue not within loop */
5837 switch (parent->kind) {
5838 case STATEMENT_WHILE: goto continue_while;
5839 case STATEMENT_DO_WHILE: goto continue_do_while;
5840 case STATEMENT_FOR: goto continue_for;
5847 case STATEMENT_BREAK: {
5848 statement_t *parent = stmt;
5850 parent = parent->base.parent;
5851 if (parent == NULL) /* break not within loop/switch */
5854 switch (parent->kind) {
5855 case STATEMENT_SWITCH:
5856 case STATEMENT_WHILE:
5857 case STATEMENT_DO_WHILE:
5860 next = parent->base.next;
5861 goto found_break_parent;
5870 case STATEMENT_GOTO:
5871 if (stmt->gotos.expression) {
5872 if (!expression_returns(stmt->gotos.expression))
5875 statement_t *parent = stmt->base.parent;
5876 if (parent == NULL) /* top level goto */
5880 next = stmt->gotos.label->statement;
5881 if (next == NULL) /* missing label */
5886 case STATEMENT_LABEL:
5887 next = stmt->label.statement;
5890 case STATEMENT_CASE_LABEL:
5891 next = stmt->case_label.statement;
5894 case STATEMENT_WHILE: {
5895 while_statement_t const *const whiles = &stmt->whiles;
5896 expression_t const *const cond = whiles->condition;
5898 if (!expression_returns(cond))
5901 int const val = determine_truth(cond);
5904 check_reachable(whiles->body);
5909 next = stmt->base.next;
5913 case STATEMENT_DO_WHILE:
5914 next = stmt->do_while.body;
5917 case STATEMENT_FOR: {
5918 for_statement_t *const fors = &stmt->fors;
5920 if (fors->condition_reachable)
5922 fors->condition_reachable = true;
5924 expression_t const *const cond = fors->condition;
5929 } else if (expression_returns(cond)) {
5930 val = determine_truth(cond);
5936 check_reachable(fors->body);
5941 next = stmt->base.next;
5945 case STATEMENT_MS_TRY: {
5946 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5947 check_reachable(ms_try->try_statement);
5948 next = ms_try->final_statement;
5952 case STATEMENT_LEAVE: {
5953 statement_t *parent = stmt;
5955 parent = parent->base.parent;
5956 if (parent == NULL) /* __leave not within __try */
5959 if (parent->kind == STATEMENT_MS_TRY) {
5961 next = parent->ms_try.final_statement;
5969 while (next == NULL) {
5970 next = last->base.parent;
5972 noreturn_candidate = false;
5974 type_t *const type = current_function->base.type;
5975 assert(is_type_function(type));
5976 type_t *const ret = skip_typeref(type->function.return_type);
5977 if (warning.return_type &&
5978 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5979 is_type_valid(ret) &&
5980 !is_sym_main(current_function->base.base.symbol)) {
5981 warningf(&stmt->base.source_position,
5982 "control reaches end of non-void function");
5987 switch (next->kind) {
5988 case STATEMENT_INVALID:
5989 case STATEMENT_EMPTY:
5990 case STATEMENT_DECLARATION:
5991 case STATEMENT_LOCAL_LABEL:
5992 case STATEMENT_EXPRESSION:
5994 case STATEMENT_RETURN:
5995 case STATEMENT_CONTINUE:
5996 case STATEMENT_BREAK:
5997 case STATEMENT_GOTO:
5998 case STATEMENT_LEAVE:
5999 panic("invalid control flow in function");
6001 case STATEMENT_COMPOUND:
6003 case STATEMENT_SWITCH:
6004 case STATEMENT_LABEL:
6005 case STATEMENT_CASE_LABEL:
6007 next = next->base.next;
6010 case STATEMENT_WHILE: {
6012 if (next->base.reachable)
6014 next->base.reachable = true;
6016 while_statement_t const *const whiles = &next->whiles;
6017 expression_t const *const cond = whiles->condition;
6019 if (!expression_returns(cond))
6022 int const val = determine_truth(cond);
6025 check_reachable(whiles->body);
6031 next = next->base.next;
6035 case STATEMENT_DO_WHILE: {
6037 if (next->base.reachable)
6039 next->base.reachable = true;
6041 do_while_statement_t const *const dw = &next->do_while;
6042 expression_t const *const cond = dw->condition;
6044 if (!expression_returns(cond))
6047 int const val = determine_truth(cond);
6050 check_reachable(dw->body);
6056 next = next->base.next;
6060 case STATEMENT_FOR: {
6062 for_statement_t *const fors = &next->fors;
6064 fors->step_reachable = true;
6066 if (fors->condition_reachable)
6068 fors->condition_reachable = true;
6070 expression_t const *const cond = fors->condition;
6075 } else if (expression_returns(cond)) {
6076 val = determine_truth(cond);
6082 check_reachable(fors->body);
6088 next = next->base.next;
6092 case STATEMENT_MS_TRY:
6094 next = next->ms_try.final_statement;
6099 check_reachable(next);
6102 static void check_unreachable(statement_t* const stmt, void *const env)
6106 switch (stmt->kind) {
6107 case STATEMENT_DO_WHILE:
6108 if (!stmt->base.reachable) {
6109 expression_t const *const cond = stmt->do_while.condition;
6110 if (determine_truth(cond) >= 0) {
6111 warningf(&cond->base.source_position,
6112 "condition of do-while-loop is unreachable");
6117 case STATEMENT_FOR: {
6118 for_statement_t const* const fors = &stmt->fors;
6120 // if init and step are unreachable, cond is unreachable, too
6121 if (!stmt->base.reachable && !fors->step_reachable) {
6122 warningf(&stmt->base.source_position, "statement is unreachable");
6124 if (!stmt->base.reachable && fors->initialisation != NULL) {
6125 warningf(&fors->initialisation->base.source_position,
6126 "initialisation of for-statement is unreachable");
6129 if (!fors->condition_reachable && fors->condition != NULL) {
6130 warningf(&fors->condition->base.source_position,
6131 "condition of for-statement is unreachable");
6134 if (!fors->step_reachable && fors->step != NULL) {
6135 warningf(&fors->step->base.source_position,
6136 "step of for-statement is unreachable");
6142 case STATEMENT_COMPOUND:
6143 if (stmt->compound.statements != NULL)
6145 goto warn_unreachable;
6147 case STATEMENT_DECLARATION: {
6148 /* Only warn if there is at least one declarator with an initializer.
6149 * This typically occurs in switch statements. */
6150 declaration_statement_t const *const decl = &stmt->declaration;
6151 entity_t const * ent = decl->declarations_begin;
6152 entity_t const *const last = decl->declarations_end;
6153 for (;; ent = ent->base.next) {
6154 if (ent->kind == ENTITY_VARIABLE &&
6155 ent->variable.initializer != NULL) {
6156 goto warn_unreachable;
6165 if (!stmt->base.reachable)
6166 warningf(&stmt->base.source_position, "statement is unreachable");
6171 static void parse_external_declaration(void)
6173 /* function-definitions and declarations both start with declaration
6175 declaration_specifiers_t specifiers;
6176 memset(&specifiers, 0, sizeof(specifiers));
6178 add_anchor_token(';');
6179 parse_declaration_specifiers(&specifiers);
6180 rem_anchor_token(';');
6182 /* must be a declaration */
6183 if (token.type == ';') {
6184 parse_anonymous_declaration_rest(&specifiers);
6188 add_anchor_token(',');
6189 add_anchor_token('=');
6190 add_anchor_token(';');
6191 add_anchor_token('{');
6193 /* declarator is common to both function-definitions and declarations */
6194 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6196 rem_anchor_token('{');
6197 rem_anchor_token(';');
6198 rem_anchor_token('=');
6199 rem_anchor_token(',');
6201 /* must be a declaration */
6202 switch (token.type) {
6206 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6211 /* must be a function definition */
6212 parse_kr_declaration_list(ndeclaration);
6214 if (token.type != '{') {
6215 parse_error_expected("while parsing function definition", '{', NULL);
6216 eat_until_matching_token(';');
6220 assert(is_declaration(ndeclaration));
6221 type_t *type = skip_typeref(ndeclaration->declaration.type);
6223 if (!is_type_function(type)) {
6224 if (is_type_valid(type)) {
6225 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6226 type, ndeclaration->base.symbol);
6232 if (warning.aggregate_return &&
6233 is_type_compound(skip_typeref(type->function.return_type))) {
6234 warningf(HERE, "function '%Y' returns an aggregate",
6235 ndeclaration->base.symbol);
6237 if (warning.traditional && !type->function.unspecified_parameters) {
6238 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6239 ndeclaration->base.symbol);
6241 if (warning.old_style_definition && type->function.unspecified_parameters) {
6242 warningf(HERE, "old-style function definition '%Y'",
6243 ndeclaration->base.symbol);
6246 /* § 6.7.5.3 (14) a function definition with () means no
6247 * parameters (and not unspecified parameters) */
6248 if (type->function.unspecified_parameters
6249 && type->function.parameters == NULL
6250 && !type->function.kr_style_parameters) {
6251 type_t *duplicate = duplicate_type(type);
6252 duplicate->function.unspecified_parameters = false;
6254 type = typehash_insert(duplicate);
6255 if (type != duplicate) {
6256 obstack_free(type_obst, duplicate);
6258 ndeclaration->declaration.type = type;
6261 entity_t *const entity = record_entity(ndeclaration, true);
6262 assert(entity->kind == ENTITY_FUNCTION);
6263 assert(ndeclaration->kind == ENTITY_FUNCTION);
6265 function_t *function = &entity->function;
6266 if (ndeclaration != entity) {
6267 function->parameters = ndeclaration->function.parameters;
6269 assert(is_declaration(entity));
6270 type = skip_typeref(entity->declaration.type);
6272 /* push function parameters and switch scope */
6273 size_t const top = environment_top();
6274 scope_t *old_scope = scope_push(&function->parameters);
6276 entity_t *parameter = function->parameters.entities;
6277 for (; parameter != NULL; parameter = parameter->base.next) {
6278 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6279 parameter->base.parent_scope = current_scope;
6281 assert(parameter->base.parent_scope == NULL
6282 || parameter->base.parent_scope == current_scope);
6283 parameter->base.parent_scope = current_scope;
6284 if (parameter->base.symbol == NULL) {
6285 errorf(¶meter->base.source_position, "parameter name omitted");
6288 environment_push(parameter);
6291 if (function->statement != NULL) {
6292 parser_error_multiple_definition(entity, HERE);
6295 /* parse function body */
6296 int label_stack_top = label_top();
6297 function_t *old_current_function = current_function;
6298 current_function = function;
6299 current_parent = NULL;
6302 goto_anchor = &goto_first;
6304 label_anchor = &label_first;
6306 statement_t *const body = parse_compound_statement(false);
6307 function->statement = body;
6310 check_declarations();
6311 if (warning.return_type ||
6312 warning.unreachable_code ||
6313 (warning.missing_noreturn
6314 && !(function->base.modifiers & DM_NORETURN))) {
6315 noreturn_candidate = true;
6316 check_reachable(body);
6317 if (warning.unreachable_code)
6318 walk_statements(body, check_unreachable, NULL);
6319 if (warning.missing_noreturn &&
6320 noreturn_candidate &&
6321 !(function->base.modifiers & DM_NORETURN)) {
6322 warningf(&body->base.source_position,
6323 "function '%#T' is candidate for attribute 'noreturn'",
6324 type, entity->base.symbol);
6328 assert(current_parent == NULL);
6329 assert(current_function == function);
6330 current_function = old_current_function;
6331 label_pop_to(label_stack_top);
6334 assert(current_scope == &function->parameters);
6335 scope_pop(old_scope);
6336 environment_pop_to(top);
6339 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6340 source_position_t *source_position,
6341 const symbol_t *symbol)
6343 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6345 type->bitfield.base_type = base_type;
6346 type->bitfield.size_expression = size;
6349 type_t *skipped_type = skip_typeref(base_type);
6350 if (!is_type_integer(skipped_type)) {
6351 errorf(HERE, "bitfield base type '%T' is not an integer type",
6355 bit_size = skipped_type->base.size * 8;
6358 if (is_constant_expression(size)) {
6359 long v = fold_constant(size);
6362 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6363 } else if (v == 0) {
6364 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6365 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6366 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6368 type->bitfield.bit_size = v;
6375 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6377 entity_t *iter = compound->members.entities;
6378 for (; iter != NULL; iter = iter->base.next) {
6379 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6382 if (iter->base.symbol == symbol) {
6384 } else if (iter->base.symbol == NULL) {
6385 type_t *type = skip_typeref(iter->declaration.type);
6386 if (is_type_compound(type)) {
6388 = find_compound_entry(type->compound.compound, symbol);
6399 static void parse_compound_declarators(compound_t *compound,
6400 const declaration_specifiers_t *specifiers)
6405 if (token.type == ':') {
6406 source_position_t source_position = *HERE;
6409 type_t *base_type = specifiers->type;
6410 expression_t *size = parse_constant_expression();
6412 type_t *type = make_bitfield_type(base_type, size,
6413 &source_position, sym_anonymous);
6415 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6416 entity->base.namespc = NAMESPACE_NORMAL;
6417 entity->base.source_position = source_position;
6418 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6419 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6420 entity->declaration.modifiers = specifiers->modifiers;
6421 entity->declaration.type = type;
6423 entity = parse_declarator(specifiers,
6424 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6425 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6427 if (token.type == ':') {
6428 source_position_t source_position = *HERE;
6430 expression_t *size = parse_constant_expression();
6432 type_t *type = entity->declaration.type;
6433 type_t *bitfield_type = make_bitfield_type(type, size,
6434 &source_position, entity->base.symbol);
6435 entity->declaration.type = bitfield_type;
6439 /* make sure we don't define a symbol multiple times */
6440 symbol_t *symbol = entity->base.symbol;
6441 if (symbol != NULL) {
6442 entity_t *prev = find_compound_entry(compound, symbol);
6445 errorf(&entity->base.source_position,
6446 "multiple declarations of symbol '%Y' (declared %P)",
6447 symbol, &prev->base.source_position);
6451 append_entity(&compound->members, entity);
6453 type_t *orig_type = entity->declaration.type;
6454 type_t *type = skip_typeref(orig_type);
6455 if (is_type_function(type)) {
6456 errorf(&entity->base.source_position,
6457 "compound member '%Y' must not have function type '%T'",
6458 entity->base.symbol, orig_type);
6459 } else if (is_type_incomplete(type)) {
6460 /* §6.7.2.1:16 flexible array member */
6461 if (is_type_array(type) &&
6462 token.type == ';' &&
6463 look_ahead(1)->type == '}') {
6464 compound->has_flexible_member = true;
6466 errorf(&entity->base.source_position,
6467 "compound member '%Y' has incomplete type '%T'",
6468 entity->base.symbol, orig_type);
6472 if (token.type != ',')
6479 anonymous_entity = NULL;
6482 static void parse_compound_type_entries(compound_t *compound)
6485 add_anchor_token('}');
6487 while (token.type != '}') {
6488 if (token.type == T_EOF) {
6489 errorf(HERE, "EOF while parsing struct");
6492 declaration_specifiers_t specifiers;
6493 memset(&specifiers, 0, sizeof(specifiers));
6494 parse_declaration_specifiers(&specifiers);
6496 parse_compound_declarators(compound, &specifiers);
6498 rem_anchor_token('}');
6502 compound->complete = true;
6505 static type_t *parse_typename(void)
6507 declaration_specifiers_t specifiers;
6508 memset(&specifiers, 0, sizeof(specifiers));
6509 parse_declaration_specifiers(&specifiers);
6510 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6511 specifiers.thread_local) {
6512 /* TODO: improve error message, user does probably not know what a
6513 * storage class is...
6515 errorf(HERE, "typename may not have a storage class");
6518 type_t *result = parse_abstract_declarator(specifiers.type);
6526 typedef expression_t* (*parse_expression_function)(void);
6527 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6529 typedef struct expression_parser_function_t expression_parser_function_t;
6530 struct expression_parser_function_t {
6531 parse_expression_function parser;
6532 unsigned infix_precedence;
6533 parse_expression_infix_function infix_parser;
6536 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6539 * Prints an error message if an expression was expected but not read
6541 static expression_t *expected_expression_error(void)
6543 /* skip the error message if the error token was read */
6544 if (token.type != T_ERROR) {
6545 errorf(HERE, "expected expression, got token '%K'", &token);
6549 return create_invalid_expression();
6553 * Parse a string constant.
6555 static expression_t *parse_string_const(void)
6558 if (token.type == T_STRING_LITERAL) {
6559 string_t res = token.v.string;
6561 while (token.type == T_STRING_LITERAL) {
6562 res = concat_strings(&res, &token.v.string);
6565 if (token.type != T_WIDE_STRING_LITERAL) {
6566 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6567 /* note: that we use type_char_ptr here, which is already the
6568 * automatic converted type. revert_automatic_type_conversion
6569 * will construct the array type */
6570 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6571 cnst->string.value = res;
6575 wres = concat_string_wide_string(&res, &token.v.wide_string);
6577 wres = token.v.wide_string;
6582 switch (token.type) {
6583 case T_WIDE_STRING_LITERAL:
6584 wres = concat_wide_strings(&wres, &token.v.wide_string);
6587 case T_STRING_LITERAL:
6588 wres = concat_wide_string_string(&wres, &token.v.string);
6592 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6593 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6594 cnst->wide_string.value = wres;
6603 * Parse a boolean constant.
6605 static expression_t *parse_bool_const(bool value)
6607 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6608 cnst->base.type = type_bool;
6609 cnst->conste.v.int_value = value;
6617 * Parse an integer constant.
6619 static expression_t *parse_int_const(void)
6621 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6622 cnst->base.type = token.datatype;
6623 cnst->conste.v.int_value = token.v.intvalue;
6631 * Parse a character constant.
6633 static expression_t *parse_character_constant(void)
6635 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6636 cnst->base.type = token.datatype;
6637 cnst->conste.v.character = token.v.string;
6639 if (cnst->conste.v.character.size != 1) {
6641 errorf(HERE, "more than 1 character in character constant");
6642 } else if (warning.multichar) {
6643 warningf(HERE, "multi-character character constant");
6652 * Parse a wide character constant.
6654 static expression_t *parse_wide_character_constant(void)
6656 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6657 cnst->base.type = token.datatype;
6658 cnst->conste.v.wide_character = token.v.wide_string;
6660 if (cnst->conste.v.wide_character.size != 1) {
6662 errorf(HERE, "more than 1 character in character constant");
6663 } else if (warning.multichar) {
6664 warningf(HERE, "multi-character character constant");
6673 * Parse a float constant.
6675 static expression_t *parse_float_const(void)
6677 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6678 cnst->base.type = token.datatype;
6679 cnst->conste.v.float_value = token.v.floatvalue;
6686 static entity_t *create_implicit_function(symbol_t *symbol,
6687 const source_position_t *source_position)
6689 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6690 ntype->function.return_type = type_int;
6691 ntype->function.unspecified_parameters = true;
6693 type_t *type = typehash_insert(ntype);
6694 if (type != ntype) {
6698 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6699 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6700 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6701 entity->declaration.type = type;
6702 entity->declaration.implicit = true;
6703 entity->base.symbol = symbol;
6704 entity->base.source_position = *source_position;
6706 bool strict_prototypes_old = warning.strict_prototypes;
6707 warning.strict_prototypes = false;
6708 record_entity(entity, false);
6709 warning.strict_prototypes = strict_prototypes_old;
6715 * Creates a return_type (func)(argument_type) function type if not
6718 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6719 type_t *argument_type2)
6721 function_parameter_t *parameter2
6722 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6723 memset(parameter2, 0, sizeof(parameter2[0]));
6724 parameter2->type = argument_type2;
6726 function_parameter_t *parameter1
6727 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6728 memset(parameter1, 0, sizeof(parameter1[0]));
6729 parameter1->type = argument_type1;
6730 parameter1->next = parameter2;
6732 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6733 type->function.return_type = return_type;
6734 type->function.parameters = parameter1;
6736 type_t *result = typehash_insert(type);
6737 if (result != type) {
6745 * Creates a return_type (func)(argument_type) function type if not
6748 * @param return_type the return type
6749 * @param argument_type the argument type
6751 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6753 function_parameter_t *parameter
6754 = obstack_alloc(type_obst, sizeof(parameter[0]));
6755 memset(parameter, 0, sizeof(parameter[0]));
6756 parameter->type = argument_type;
6758 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6759 type->function.return_type = return_type;
6760 type->function.parameters = parameter;
6762 type_t *result = typehash_insert(type);
6763 if (result != type) {
6770 static type_t *make_function_0_type(type_t *return_type)
6772 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6773 type->function.return_type = return_type;
6774 type->function.parameters = NULL;
6776 type_t *result = typehash_insert(type);
6777 if (result != type) {
6785 * Creates a function type for some function like builtins.
6787 * @param symbol the symbol describing the builtin
6789 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6791 switch (symbol->ID) {
6792 case T___builtin_alloca:
6793 return make_function_1_type(type_void_ptr, type_size_t);
6794 case T___builtin_huge_val:
6795 return make_function_0_type(type_double);
6796 case T___builtin_inf:
6797 return make_function_0_type(type_double);
6798 case T___builtin_inff:
6799 return make_function_0_type(type_float);
6800 case T___builtin_infl:
6801 return make_function_0_type(type_long_double);
6802 case T___builtin_nan:
6803 return make_function_1_type(type_double, type_char_ptr);
6804 case T___builtin_nanf:
6805 return make_function_1_type(type_float, type_char_ptr);
6806 case T___builtin_nanl:
6807 return make_function_1_type(type_long_double, type_char_ptr);
6808 case T___builtin_va_end:
6809 return make_function_1_type(type_void, type_valist);
6810 case T___builtin_expect:
6811 return make_function_2_type(type_long, type_long, type_long);
6813 internal_errorf(HERE, "not implemented builtin symbol found");
6818 * Performs automatic type cast as described in § 6.3.2.1.
6820 * @param orig_type the original type
6822 static type_t *automatic_type_conversion(type_t *orig_type)
6824 type_t *type = skip_typeref(orig_type);
6825 if (is_type_array(type)) {
6826 array_type_t *array_type = &type->array;
6827 type_t *element_type = array_type->element_type;
6828 unsigned qualifiers = array_type->base.qualifiers;
6830 return make_pointer_type(element_type, qualifiers);
6833 if (is_type_function(type)) {
6834 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6841 * reverts the automatic casts of array to pointer types and function
6842 * to function-pointer types as defined § 6.3.2.1
6844 type_t *revert_automatic_type_conversion(const expression_t *expression)
6846 switch (expression->kind) {
6847 case EXPR_REFERENCE: {
6848 entity_t *entity = expression->reference.entity;
6849 if (is_declaration(entity)) {
6850 return entity->declaration.type;
6851 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6852 return entity->enum_value.enum_type;
6854 panic("no declaration or enum in reference");
6859 entity_t *entity = expression->select.compound_entry;
6860 assert(is_declaration(entity));
6861 type_t *type = entity->declaration.type;
6862 return get_qualified_type(type,
6863 expression->base.type->base.qualifiers);
6866 case EXPR_UNARY_DEREFERENCE: {
6867 const expression_t *const value = expression->unary.value;
6868 type_t *const type = skip_typeref(value->base.type);
6869 assert(is_type_pointer(type));
6870 return type->pointer.points_to;
6873 case EXPR_BUILTIN_SYMBOL:
6874 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6876 case EXPR_ARRAY_ACCESS: {
6877 const expression_t *array_ref = expression->array_access.array_ref;
6878 type_t *type_left = skip_typeref(array_ref->base.type);
6879 if (!is_type_valid(type_left))
6881 assert(is_type_pointer(type_left));
6882 return type_left->pointer.points_to;
6885 case EXPR_STRING_LITERAL: {
6886 size_t size = expression->string.value.size;
6887 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6890 case EXPR_WIDE_STRING_LITERAL: {
6891 size_t size = expression->wide_string.value.size;
6892 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6895 case EXPR_COMPOUND_LITERAL:
6896 return expression->compound_literal.type;
6901 return expression->base.type;
6904 static expression_t *parse_reference(void)
6906 symbol_t *const symbol = token.v.symbol;
6908 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
6910 if (entity == NULL) {
6911 if (!strict_mode && look_ahead(1)->type == '(') {
6912 /* an implicitly declared function */
6913 if (warning.implicit_function_declaration) {
6914 warningf(HERE, "implicit declaration of function '%Y'",
6918 entity = create_implicit_function(symbol, HERE);
6920 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6921 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6927 if (is_declaration(entity)) {
6928 orig_type = entity->declaration.type;
6929 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6930 orig_type = entity->enum_value.enum_type;
6931 } else if (entity->kind == ENTITY_TYPEDEF) {
6932 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
6935 return create_invalid_expression();
6937 panic("expected declaration or enum value in reference");
6940 /* we always do the auto-type conversions; the & and sizeof parser contains
6941 * code to revert this! */
6942 type_t *type = automatic_type_conversion(orig_type);
6944 expression_kind_t kind = EXPR_REFERENCE;
6945 if (entity->kind == ENTITY_ENUM_VALUE)
6946 kind = EXPR_REFERENCE_ENUM_VALUE;
6948 expression_t *expression = allocate_expression_zero(kind);
6949 expression->reference.entity = entity;
6950 expression->base.type = type;
6952 /* this declaration is used */
6953 if (is_declaration(entity)) {
6954 entity->declaration.used = true;
6957 if (entity->base.parent_scope != file_scope
6958 && entity->base.parent_scope->depth < current_function->parameters.depth
6959 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
6960 if (entity->kind == ENTITY_VARIABLE) {
6961 /* access of a variable from an outer function */
6962 entity->variable.address_taken = true;
6963 } else if (entity->kind == ENTITY_PARAMETER) {
6964 entity->parameter.address_taken = true;
6966 current_function->need_closure = true;
6969 /* check for deprecated functions */
6970 if (warning.deprecated_declarations
6971 && is_declaration(entity)
6972 && entity->declaration.modifiers & DM_DEPRECATED) {
6973 declaration_t *declaration = &entity->declaration;
6975 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
6976 "function" : "variable";
6978 if (declaration->deprecated_string != NULL) {
6979 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6980 prefix, entity->base.symbol, &entity->base.source_position,
6981 declaration->deprecated_string);
6983 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6984 entity->base.symbol, &entity->base.source_position);
6988 if (warning.init_self && entity == current_init_decl && !in_type_prop
6989 && entity->kind == ENTITY_VARIABLE) {
6990 current_init_decl = NULL;
6991 warningf(HERE, "variable '%#T' is initialized by itself",
6992 entity->declaration.type, entity->base.symbol);
6999 static bool semantic_cast(expression_t *cast)
7001 expression_t *expression = cast->unary.value;
7002 type_t *orig_dest_type = cast->base.type;
7003 type_t *orig_type_right = expression->base.type;
7004 type_t const *dst_type = skip_typeref(orig_dest_type);
7005 type_t const *src_type = skip_typeref(orig_type_right);
7006 source_position_t const *pos = &cast->base.source_position;
7008 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7009 if (dst_type == type_void)
7012 /* only integer and pointer can be casted to pointer */
7013 if (is_type_pointer(dst_type) &&
7014 !is_type_pointer(src_type) &&
7015 !is_type_integer(src_type) &&
7016 is_type_valid(src_type)) {
7017 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7021 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7022 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7026 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7027 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7031 if (warning.cast_qual &&
7032 is_type_pointer(src_type) &&
7033 is_type_pointer(dst_type)) {
7034 type_t *src = skip_typeref(src_type->pointer.points_to);
7035 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7036 unsigned missing_qualifiers =
7037 src->base.qualifiers & ~dst->base.qualifiers;
7038 if (missing_qualifiers != 0) {
7040 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7041 missing_qualifiers, orig_type_right);
7047 static expression_t *parse_compound_literal(type_t *type)
7049 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7051 parse_initializer_env_t env;
7054 env.must_be_constant = false;
7055 initializer_t *initializer = parse_initializer(&env);
7058 expression->compound_literal.initializer = initializer;
7059 expression->compound_literal.type = type;
7060 expression->base.type = automatic_type_conversion(type);
7066 * Parse a cast expression.
7068 static expression_t *parse_cast(void)
7070 add_anchor_token(')');
7072 source_position_t source_position = token.source_position;
7074 type_t *type = parse_typename();
7076 rem_anchor_token(')');
7079 if (token.type == '{') {
7080 return parse_compound_literal(type);
7083 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7084 cast->base.source_position = source_position;
7086 expression_t *value = parse_sub_expression(PREC_CAST);
7087 cast->base.type = type;
7088 cast->unary.value = value;
7090 if (! semantic_cast(cast)) {
7091 /* TODO: record the error in the AST. else it is impossible to detect it */
7096 return create_invalid_expression();
7100 * Parse a statement expression.
7102 static expression_t *parse_statement_expression(void)
7104 add_anchor_token(')');
7106 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7108 statement_t *statement = parse_compound_statement(true);
7109 expression->statement.statement = statement;
7111 /* find last statement and use its type */
7112 type_t *type = type_void;
7113 const statement_t *stmt = statement->compound.statements;
7115 while (stmt->base.next != NULL)
7116 stmt = stmt->base.next;
7118 if (stmt->kind == STATEMENT_EXPRESSION) {
7119 type = stmt->expression.expression->base.type;
7121 } else if (warning.other) {
7122 warningf(&expression->base.source_position, "empty statement expression ({})");
7124 expression->base.type = type;
7126 rem_anchor_token(')');
7134 * Parse a parenthesized expression.
7136 static expression_t *parse_parenthesized_expression(void)
7140 switch (token.type) {
7142 /* gcc extension: a statement expression */
7143 return parse_statement_expression();
7147 return parse_cast();
7149 if (is_typedef_symbol(token.v.symbol)) {
7150 return parse_cast();
7154 add_anchor_token(')');
7155 expression_t *result = parse_expression();
7156 rem_anchor_token(')');
7163 static expression_t *parse_function_keyword(void)
7167 if (current_function == NULL) {
7168 errorf(HERE, "'__func__' used outside of a function");
7171 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7172 expression->base.type = type_char_ptr;
7173 expression->funcname.kind = FUNCNAME_FUNCTION;
7180 static expression_t *parse_pretty_function_keyword(void)
7182 if (current_function == NULL) {
7183 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7186 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7187 expression->base.type = type_char_ptr;
7188 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7190 eat(T___PRETTY_FUNCTION__);
7195 static expression_t *parse_funcsig_keyword(void)
7197 if (current_function == NULL) {
7198 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7201 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7202 expression->base.type = type_char_ptr;
7203 expression->funcname.kind = FUNCNAME_FUNCSIG;
7210 static expression_t *parse_funcdname_keyword(void)
7212 if (current_function == NULL) {
7213 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7216 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7217 expression->base.type = type_char_ptr;
7218 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7220 eat(T___FUNCDNAME__);
7225 static designator_t *parse_designator(void)
7227 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7228 result->source_position = *HERE;
7230 if (token.type != T_IDENTIFIER) {
7231 parse_error_expected("while parsing member designator",
7232 T_IDENTIFIER, NULL);
7235 result->symbol = token.v.symbol;
7238 designator_t *last_designator = result;
7240 if (token.type == '.') {
7242 if (token.type != T_IDENTIFIER) {
7243 parse_error_expected("while parsing member designator",
7244 T_IDENTIFIER, NULL);
7247 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7248 designator->source_position = *HERE;
7249 designator->symbol = token.v.symbol;
7252 last_designator->next = designator;
7253 last_designator = designator;
7256 if (token.type == '[') {
7258 add_anchor_token(']');
7259 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7260 designator->source_position = *HERE;
7261 designator->array_index = parse_expression();
7262 rem_anchor_token(']');
7264 if (designator->array_index == NULL) {
7268 last_designator->next = designator;
7269 last_designator = designator;
7281 * Parse the __builtin_offsetof() expression.
7283 static expression_t *parse_offsetof(void)
7285 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7286 expression->base.type = type_size_t;
7288 eat(T___builtin_offsetof);
7291 add_anchor_token(',');
7292 type_t *type = parse_typename();
7293 rem_anchor_token(',');
7295 add_anchor_token(')');
7296 designator_t *designator = parse_designator();
7297 rem_anchor_token(')');
7300 expression->offsetofe.type = type;
7301 expression->offsetofe.designator = designator;
7304 memset(&path, 0, sizeof(path));
7305 path.top_type = type;
7306 path.path = NEW_ARR_F(type_path_entry_t, 0);
7308 descend_into_subtype(&path);
7310 if (!walk_designator(&path, designator, true)) {
7311 return create_invalid_expression();
7314 DEL_ARR_F(path.path);
7318 return create_invalid_expression();
7322 * Parses a _builtin_va_start() expression.
7324 static expression_t *parse_va_start(void)
7326 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7328 eat(T___builtin_va_start);
7331 add_anchor_token(',');
7332 expression->va_starte.ap = parse_assignment_expression();
7333 rem_anchor_token(',');
7335 expression_t *const expr = parse_assignment_expression();
7336 if (expr->kind == EXPR_REFERENCE) {
7337 entity_t *const entity = expr->reference.entity;
7338 if (entity->base.parent_scope != ¤t_function->parameters
7339 || entity->base.next != NULL
7340 || entity->kind != ENTITY_PARAMETER) {
7341 errorf(&expr->base.source_position,
7342 "second argument of 'va_start' must be last parameter of the current function");
7344 expression->va_starte.parameter = &entity->variable;
7351 return create_invalid_expression();
7355 * Parses a _builtin_va_arg() expression.
7357 static expression_t *parse_va_arg(void)
7359 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7361 eat(T___builtin_va_arg);
7364 expression->va_arge.ap = parse_assignment_expression();
7366 expression->base.type = parse_typename();
7371 return create_invalid_expression();
7374 static expression_t *parse_builtin_symbol(void)
7376 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7378 symbol_t *symbol = token.v.symbol;
7380 expression->builtin_symbol.symbol = symbol;
7383 type_t *type = get_builtin_symbol_type(symbol);
7384 type = automatic_type_conversion(type);
7386 expression->base.type = type;
7391 * Parses a __builtin_constant() expression.
7393 static expression_t *parse_builtin_constant(void)
7395 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7397 eat(T___builtin_constant_p);
7400 add_anchor_token(')');
7401 expression->builtin_constant.value = parse_assignment_expression();
7402 rem_anchor_token(')');
7404 expression->base.type = type_int;
7408 return create_invalid_expression();
7412 * Parses a __builtin_prefetch() expression.
7414 static expression_t *parse_builtin_prefetch(void)
7416 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7418 eat(T___builtin_prefetch);
7421 add_anchor_token(')');
7422 expression->builtin_prefetch.adr = parse_assignment_expression();
7423 if (token.type == ',') {
7425 expression->builtin_prefetch.rw = parse_assignment_expression();
7427 if (token.type == ',') {
7429 expression->builtin_prefetch.locality = parse_assignment_expression();
7431 rem_anchor_token(')');
7433 expression->base.type = type_void;
7437 return create_invalid_expression();
7441 * Parses a __builtin_is_*() compare expression.
7443 static expression_t *parse_compare_builtin(void)
7445 expression_t *expression;
7447 switch (token.type) {
7448 case T___builtin_isgreater:
7449 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7451 case T___builtin_isgreaterequal:
7452 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7454 case T___builtin_isless:
7455 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7457 case T___builtin_islessequal:
7458 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7460 case T___builtin_islessgreater:
7461 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7463 case T___builtin_isunordered:
7464 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7467 internal_errorf(HERE, "invalid compare builtin found");
7469 expression->base.source_position = *HERE;
7473 expression->binary.left = parse_assignment_expression();
7475 expression->binary.right = parse_assignment_expression();
7478 type_t *const orig_type_left = expression->binary.left->base.type;
7479 type_t *const orig_type_right = expression->binary.right->base.type;
7481 type_t *const type_left = skip_typeref(orig_type_left);
7482 type_t *const type_right = skip_typeref(orig_type_right);
7483 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7484 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7485 type_error_incompatible("invalid operands in comparison",
7486 &expression->base.source_position, orig_type_left, orig_type_right);
7489 semantic_comparison(&expression->binary);
7494 return create_invalid_expression();
7499 * Parses a __builtin_expect() expression.
7501 static expression_t *parse_builtin_expect(void)
7503 expression_t *expression
7504 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7506 eat(T___builtin_expect);
7509 expression->binary.left = parse_assignment_expression();
7511 expression->binary.right = parse_constant_expression();
7514 expression->base.type = expression->binary.left->base.type;
7518 return create_invalid_expression();
7523 * Parses a MS assume() expression.
7525 static expression_t *parse_assume(void)
7527 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7532 add_anchor_token(')');
7533 expression->unary.value = parse_assignment_expression();
7534 rem_anchor_token(')');
7537 expression->base.type = type_void;
7540 return create_invalid_expression();
7544 * Return the declaration for a given label symbol or create a new one.
7546 * @param symbol the symbol of the label
7548 static label_t *get_label(symbol_t *symbol)
7551 assert(current_function != NULL);
7553 label = get_entity(symbol, NAMESPACE_LABEL);
7554 /* if we found a local label, we already created the declaration */
7555 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7556 if (label->base.parent_scope != current_scope) {
7557 assert(label->base.parent_scope->depth < current_scope->depth);
7558 current_function->goto_to_outer = true;
7560 return &label->label;
7563 label = get_entity(symbol, NAMESPACE_LABEL);
7564 /* if we found a label in the same function, then we already created the
7567 && label->base.parent_scope == ¤t_function->parameters) {
7568 return &label->label;
7571 /* otherwise we need to create a new one */
7572 label = allocate_entity_zero(ENTITY_LABEL);
7573 label->base.namespc = NAMESPACE_LABEL;
7574 label->base.symbol = symbol;
7578 return &label->label;
7582 * Parses a GNU && label address expression.
7584 static expression_t *parse_label_address(void)
7586 source_position_t source_position = token.source_position;
7588 if (token.type != T_IDENTIFIER) {
7589 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7592 symbol_t *symbol = token.v.symbol;
7595 label_t *label = get_label(symbol);
7597 label->address_taken = true;
7599 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7600 expression->base.source_position = source_position;
7602 /* label address is threaten as a void pointer */
7603 expression->base.type = type_void_ptr;
7604 expression->label_address.label = label;
7607 return create_invalid_expression();
7611 * Parse a microsoft __noop expression.
7613 static expression_t *parse_noop_expression(void)
7615 /* the result is a (int)0 */
7616 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7617 cnst->base.type = type_int;
7618 cnst->conste.v.int_value = 0;
7619 cnst->conste.is_ms_noop = true;
7623 if (token.type == '(') {
7624 /* parse arguments */
7626 add_anchor_token(')');
7627 add_anchor_token(',');
7629 if (token.type != ')') {
7631 (void)parse_assignment_expression();
7632 if (token.type != ',')
7638 rem_anchor_token(',');
7639 rem_anchor_token(')');
7647 * Parses a primary expression.
7649 static expression_t *parse_primary_expression(void)
7651 switch (token.type) {
7652 case T_false: return parse_bool_const(false);
7653 case T_true: return parse_bool_const(true);
7654 case T_INTEGER: return parse_int_const();
7655 case T_CHARACTER_CONSTANT: return parse_character_constant();
7656 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7657 case T_FLOATINGPOINT: return parse_float_const();
7658 case T_STRING_LITERAL:
7659 case T_WIDE_STRING_LITERAL: return parse_string_const();
7660 case T_IDENTIFIER: return parse_reference();
7661 case T___FUNCTION__:
7662 case T___func__: return parse_function_keyword();
7663 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7664 case T___FUNCSIG__: return parse_funcsig_keyword();
7665 case T___FUNCDNAME__: return parse_funcdname_keyword();
7666 case T___builtin_offsetof: return parse_offsetof();
7667 case T___builtin_va_start: return parse_va_start();
7668 case T___builtin_va_arg: return parse_va_arg();
7669 case T___builtin_expect:
7670 case T___builtin_alloca:
7671 case T___builtin_inf:
7672 case T___builtin_inff:
7673 case T___builtin_infl:
7674 case T___builtin_nan:
7675 case T___builtin_nanf:
7676 case T___builtin_nanl:
7677 case T___builtin_huge_val:
7678 case T___builtin_va_end: return parse_builtin_symbol();
7679 case T___builtin_isgreater:
7680 case T___builtin_isgreaterequal:
7681 case T___builtin_isless:
7682 case T___builtin_islessequal:
7683 case T___builtin_islessgreater:
7684 case T___builtin_isunordered: return parse_compare_builtin();
7685 case T___builtin_constant_p: return parse_builtin_constant();
7686 case T___builtin_prefetch: return parse_builtin_prefetch();
7687 case T__assume: return parse_assume();
7690 return parse_label_address();
7693 case '(': return parse_parenthesized_expression();
7694 case T___noop: return parse_noop_expression();
7697 errorf(HERE, "unexpected token '%K', expected an expression", &token);
7698 return create_invalid_expression();
7702 * Check if the expression has the character type and issue a warning then.
7704 static void check_for_char_index_type(const expression_t *expression)
7706 type_t *const type = expression->base.type;
7707 const type_t *const base_type = skip_typeref(type);
7709 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7710 warning.char_subscripts) {
7711 warningf(&expression->base.source_position,
7712 "array subscript has type '%T'", type);
7716 static expression_t *parse_array_expression(expression_t *left)
7718 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7721 add_anchor_token(']');
7723 expression_t *inside = parse_expression();
7725 type_t *const orig_type_left = left->base.type;
7726 type_t *const orig_type_inside = inside->base.type;
7728 type_t *const type_left = skip_typeref(orig_type_left);
7729 type_t *const type_inside = skip_typeref(orig_type_inside);
7731 type_t *return_type;
7732 array_access_expression_t *array_access = &expression->array_access;
7733 if (is_type_pointer(type_left)) {
7734 return_type = type_left->pointer.points_to;
7735 array_access->array_ref = left;
7736 array_access->index = inside;
7737 check_for_char_index_type(inside);
7738 } else if (is_type_pointer(type_inside)) {
7739 return_type = type_inside->pointer.points_to;
7740 array_access->array_ref = inside;
7741 array_access->index = left;
7742 array_access->flipped = true;
7743 check_for_char_index_type(left);
7745 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7747 "array access on object with non-pointer types '%T', '%T'",
7748 orig_type_left, orig_type_inside);
7750 return_type = type_error_type;
7751 array_access->array_ref = left;
7752 array_access->index = inside;
7755 expression->base.type = automatic_type_conversion(return_type);
7757 rem_anchor_token(']');
7763 static expression_t *parse_typeprop(expression_kind_t const kind)
7765 expression_t *tp_expression = allocate_expression_zero(kind);
7766 tp_expression->base.type = type_size_t;
7768 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7770 /* we only refer to a type property, mark this case */
7771 bool old = in_type_prop;
7772 in_type_prop = true;
7775 expression_t *expression;
7776 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7778 add_anchor_token(')');
7779 orig_type = parse_typename();
7780 rem_anchor_token(')');
7783 if (token.type == '{') {
7784 /* It was not sizeof(type) after all. It is sizeof of an expression
7785 * starting with a compound literal */
7786 expression = parse_compound_literal(orig_type);
7787 goto typeprop_expression;
7790 expression = parse_sub_expression(PREC_UNARY);
7792 typeprop_expression:
7793 tp_expression->typeprop.tp_expression = expression;
7795 orig_type = revert_automatic_type_conversion(expression);
7796 expression->base.type = orig_type;
7799 tp_expression->typeprop.type = orig_type;
7800 type_t const* const type = skip_typeref(orig_type);
7801 char const* const wrong_type =
7802 is_type_incomplete(type) ? "incomplete" :
7803 type->kind == TYPE_FUNCTION ? "function designator" :
7804 type->kind == TYPE_BITFIELD ? "bitfield" :
7806 if (wrong_type != NULL) {
7807 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7808 errorf(&tp_expression->base.source_position,
7809 "operand of %s expression must not be of %s type '%T'",
7810 what, wrong_type, orig_type);
7815 return tp_expression;
7818 static expression_t *parse_sizeof(void)
7820 return parse_typeprop(EXPR_SIZEOF);
7823 static expression_t *parse_alignof(void)
7825 return parse_typeprop(EXPR_ALIGNOF);
7828 static expression_t *parse_select_expression(expression_t *compound)
7830 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7831 select->select.compound = compound;
7833 assert(token.type == '.' || token.type == T_MINUSGREATER);
7834 bool is_pointer = (token.type == T_MINUSGREATER);
7837 if (token.type != T_IDENTIFIER) {
7838 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7841 symbol_t *symbol = token.v.symbol;
7844 type_t *const orig_type = compound->base.type;
7845 type_t *const type = skip_typeref(orig_type);
7848 bool saw_error = false;
7849 if (is_type_pointer(type)) {
7852 "request for member '%Y' in something not a struct or union, but '%T'",
7856 type_left = skip_typeref(type->pointer.points_to);
7858 if (is_pointer && is_type_valid(type)) {
7859 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7866 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7867 type_left->kind == TYPE_COMPOUND_UNION) {
7868 compound_t *compound = type_left->compound.compound;
7870 if (!compound->complete) {
7871 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7873 goto create_error_entry;
7876 entry = find_compound_entry(compound, symbol);
7877 if (entry == NULL) {
7878 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7879 goto create_error_entry;
7882 if (is_type_valid(type_left) && !saw_error) {
7884 "request for member '%Y' in something not a struct or union, but '%T'",
7888 return create_invalid_expression();
7891 assert(is_declaration(entry));
7892 select->select.compound_entry = entry;
7894 type_t *entry_type = entry->declaration.type;
7896 = get_qualified_type(entry_type, type_left->base.qualifiers);
7898 /* we always do the auto-type conversions; the & and sizeof parser contains
7899 * code to revert this! */
7900 select->base.type = automatic_type_conversion(res_type);
7902 type_t *skipped = skip_typeref(res_type);
7903 if (skipped->kind == TYPE_BITFIELD) {
7904 select->base.type = skipped->bitfield.base_type;
7910 static void check_call_argument(const function_parameter_t *parameter,
7911 call_argument_t *argument, unsigned pos)
7913 type_t *expected_type = parameter->type;
7914 type_t *expected_type_skip = skip_typeref(expected_type);
7915 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7916 expression_t *arg_expr = argument->expression;
7917 type_t *arg_type = skip_typeref(arg_expr->base.type);
7919 /* handle transparent union gnu extension */
7920 if (is_type_union(expected_type_skip)
7921 && (expected_type_skip->base.modifiers
7922 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7923 compound_t *union_decl = expected_type_skip->compound.compound;
7924 type_t *best_type = NULL;
7925 entity_t *entry = union_decl->members.entities;
7926 for ( ; entry != NULL; entry = entry->base.next) {
7927 assert(is_declaration(entry));
7928 type_t *decl_type = entry->declaration.type;
7929 error = semantic_assign(decl_type, arg_expr);
7930 if (error == ASSIGN_ERROR_INCOMPATIBLE
7931 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7934 if (error == ASSIGN_SUCCESS) {
7935 best_type = decl_type;
7936 } else if (best_type == NULL) {
7937 best_type = decl_type;
7941 if (best_type != NULL) {
7942 expected_type = best_type;
7946 error = semantic_assign(expected_type, arg_expr);
7947 argument->expression = create_implicit_cast(argument->expression,
7950 if (error != ASSIGN_SUCCESS) {
7951 /* report exact scope in error messages (like "in argument 3") */
7953 snprintf(buf, sizeof(buf), "call argument %u", pos);
7954 report_assign_error(error, expected_type, arg_expr, buf,
7955 &arg_expr->base.source_position);
7956 } else if (warning.traditional || warning.conversion) {
7957 type_t *const promoted_type = get_default_promoted_type(arg_type);
7958 if (!types_compatible(expected_type_skip, promoted_type) &&
7959 !types_compatible(expected_type_skip, type_void_ptr) &&
7960 !types_compatible(type_void_ptr, promoted_type)) {
7961 /* Deliberately show the skipped types in this warning */
7962 warningf(&arg_expr->base.source_position,
7963 "passing call argument %u as '%T' rather than '%T' due to prototype",
7964 pos, expected_type_skip, promoted_type);
7970 * Parse a call expression, ie. expression '( ... )'.
7972 * @param expression the function address
7974 static expression_t *parse_call_expression(expression_t *expression)
7976 expression_t *result = allocate_expression_zero(EXPR_CALL);
7977 call_expression_t *call = &result->call;
7978 call->function = expression;
7980 type_t *const orig_type = expression->base.type;
7981 type_t *const type = skip_typeref(orig_type);
7983 function_type_t *function_type = NULL;
7984 if (is_type_pointer(type)) {
7985 type_t *const to_type = skip_typeref(type->pointer.points_to);
7987 if (is_type_function(to_type)) {
7988 function_type = &to_type->function;
7989 call->base.type = function_type->return_type;
7993 if (function_type == NULL && is_type_valid(type)) {
7994 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7997 /* parse arguments */
7999 add_anchor_token(')');
8000 add_anchor_token(',');
8002 if (token.type != ')') {
8003 call_argument_t *last_argument = NULL;
8006 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8008 argument->expression = parse_assignment_expression();
8009 if (last_argument == NULL) {
8010 call->arguments = argument;
8012 last_argument->next = argument;
8014 last_argument = argument;
8016 if (token.type != ',')
8021 rem_anchor_token(',');
8022 rem_anchor_token(')');
8025 if (function_type == NULL)
8028 function_parameter_t *parameter = function_type->parameters;
8029 call_argument_t *argument = call->arguments;
8030 if (!function_type->unspecified_parameters) {
8031 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8032 parameter = parameter->next, argument = argument->next) {
8033 check_call_argument(parameter, argument, ++pos);
8036 if (parameter != NULL) {
8037 errorf(HERE, "too few arguments to function '%E'", expression);
8038 } else if (argument != NULL && !function_type->variadic) {
8039 errorf(HERE, "too many arguments to function '%E'", expression);
8043 /* do default promotion */
8044 for (; argument != NULL; argument = argument->next) {
8045 type_t *type = argument->expression->base.type;
8047 type = get_default_promoted_type(type);
8049 argument->expression
8050 = create_implicit_cast(argument->expression, type);
8053 check_format(&result->call);
8055 if (warning.aggregate_return &&
8056 is_type_compound(skip_typeref(function_type->return_type))) {
8057 warningf(&result->base.source_position,
8058 "function call has aggregate value");
8065 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8067 static bool same_compound_type(const type_t *type1, const type_t *type2)
8070 is_type_compound(type1) &&
8071 type1->kind == type2->kind &&
8072 type1->compound.compound == type2->compound.compound;
8075 static expression_t const *get_reference_address(expression_t const *expr)
8077 bool regular_take_address = true;
8079 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8080 expr = expr->unary.value;
8082 regular_take_address = false;
8085 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8088 expr = expr->unary.value;
8091 if (expr->kind != EXPR_REFERENCE)
8094 /* special case for functions which are automatically converted to a
8095 * pointer to function without an extra TAKE_ADDRESS operation */
8096 if (!regular_take_address &&
8097 expr->reference.entity->kind != ENTITY_FUNCTION) {
8104 static void warn_reference_address_as_bool(expression_t const* expr)
8106 if (!warning.address)
8109 expr = get_reference_address(expr);
8111 warningf(&expr->base.source_position,
8112 "the address of '%Y' will always evaluate as 'true'",
8113 expr->reference.entity->base.symbol);
8117 static void semantic_condition(expression_t const *const expr,
8118 char const *const context)
8120 type_t *const type = skip_typeref(expr->base.type);
8121 if (is_type_scalar(type)) {
8122 warn_reference_address_as_bool(expr);
8123 } else if (is_type_valid(type)) {
8124 errorf(&expr->base.source_position,
8125 "%s must have scalar type", context);
8130 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8132 * @param expression the conditional expression
8134 static expression_t *parse_conditional_expression(expression_t *expression)
8136 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8138 conditional_expression_t *conditional = &result->conditional;
8139 conditional->condition = expression;
8142 add_anchor_token(':');
8144 /* §6.5.15:2 The first operand shall have scalar type. */
8145 semantic_condition(expression, "condition of conditional operator");
8147 expression_t *true_expression = expression;
8148 bool gnu_cond = false;
8149 if (GNU_MODE && token.type == ':') {
8152 true_expression = parse_expression();
8154 rem_anchor_token(':');
8156 expression_t *false_expression =
8157 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8159 type_t *const orig_true_type = true_expression->base.type;
8160 type_t *const orig_false_type = false_expression->base.type;
8161 type_t *const true_type = skip_typeref(orig_true_type);
8162 type_t *const false_type = skip_typeref(orig_false_type);
8165 type_t *result_type;
8166 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8167 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8168 /* ISO/IEC 14882:1998(E) §5.16:2 */
8169 if (true_expression->kind == EXPR_UNARY_THROW) {
8170 result_type = false_type;
8171 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8172 result_type = true_type;
8174 if (warning.other && (
8175 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8176 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8178 warningf(&conditional->base.source_position,
8179 "ISO C forbids conditional expression with only one void side");
8181 result_type = type_void;
8183 } else if (is_type_arithmetic(true_type)
8184 && is_type_arithmetic(false_type)) {
8185 result_type = semantic_arithmetic(true_type, false_type);
8187 true_expression = create_implicit_cast(true_expression, result_type);
8188 false_expression = create_implicit_cast(false_expression, result_type);
8190 conditional->true_expression = true_expression;
8191 conditional->false_expression = false_expression;
8192 conditional->base.type = result_type;
8193 } else if (same_compound_type(true_type, false_type)) {
8194 /* just take 1 of the 2 types */
8195 result_type = true_type;
8196 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8197 type_t *pointer_type;
8199 expression_t *other_expression;
8200 if (is_type_pointer(true_type) &&
8201 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8202 pointer_type = true_type;
8203 other_type = false_type;
8204 other_expression = false_expression;
8206 pointer_type = false_type;
8207 other_type = true_type;
8208 other_expression = true_expression;
8211 if (is_null_pointer_constant(other_expression)) {
8212 result_type = pointer_type;
8213 } else if (is_type_pointer(other_type)) {
8214 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8215 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8218 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8219 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8221 } else if (types_compatible(get_unqualified_type(to1),
8222 get_unqualified_type(to2))) {
8225 if (warning.other) {
8226 warningf(&conditional->base.source_position,
8227 "pointer types '%T' and '%T' in conditional expression are incompatible",
8228 true_type, false_type);
8233 type_t *const type =
8234 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8235 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8236 } else if (is_type_integer(other_type)) {
8237 if (warning.other) {
8238 warningf(&conditional->base.source_position,
8239 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8241 result_type = pointer_type;
8243 if (is_type_valid(other_type)) {
8244 type_error_incompatible("while parsing conditional",
8245 &expression->base.source_position, true_type, false_type);
8247 result_type = type_error_type;
8250 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8251 type_error_incompatible("while parsing conditional",
8252 &conditional->base.source_position, true_type,
8255 result_type = type_error_type;
8258 conditional->true_expression
8259 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8260 conditional->false_expression
8261 = create_implicit_cast(false_expression, result_type);
8262 conditional->base.type = result_type;
8265 return create_invalid_expression();
8269 * Parse an extension expression.
8271 static expression_t *parse_extension(void)
8273 eat(T___extension__);
8275 bool old_gcc_extension = in_gcc_extension;
8276 in_gcc_extension = true;
8277 expression_t *expression = parse_sub_expression(PREC_UNARY);
8278 in_gcc_extension = old_gcc_extension;
8283 * Parse a __builtin_classify_type() expression.
8285 static expression_t *parse_builtin_classify_type(void)
8287 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8288 result->base.type = type_int;
8290 eat(T___builtin_classify_type);
8293 add_anchor_token(')');
8294 expression_t *expression = parse_expression();
8295 rem_anchor_token(')');
8297 result->classify_type.type_expression = expression;
8301 return create_invalid_expression();
8305 * Parse a delete expression
8306 * ISO/IEC 14882:1998(E) §5.3.5
8308 static expression_t *parse_delete(void)
8310 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8311 result->base.type = type_void;
8315 if (token.type == '[') {
8317 result->kind = EXPR_UNARY_DELETE_ARRAY;
8322 expression_t *const value = parse_sub_expression(PREC_CAST);
8323 result->unary.value = value;
8325 type_t *const type = skip_typeref(value->base.type);
8326 if (!is_type_pointer(type)) {
8327 errorf(&value->base.source_position,
8328 "operand of delete must have pointer type");
8329 } else if (warning.other &&
8330 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8331 warningf(&value->base.source_position,
8332 "deleting 'void*' is undefined");
8339 * Parse a throw expression
8340 * ISO/IEC 14882:1998(E) §15:1
8342 static expression_t *parse_throw(void)
8344 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8345 result->base.type = type_void;
8349 expression_t *value = NULL;
8350 switch (token.type) {
8352 value = parse_assignment_expression();
8353 /* ISO/IEC 14882:1998(E) §15.1:3 */
8354 type_t *const orig_type = value->base.type;
8355 type_t *const type = skip_typeref(orig_type);
8356 if (is_type_incomplete(type)) {
8357 errorf(&value->base.source_position,
8358 "cannot throw object of incomplete type '%T'", orig_type);
8359 } else if (is_type_pointer(type)) {
8360 type_t *const points_to = skip_typeref(type->pointer.points_to);
8361 if (is_type_incomplete(points_to) &&
8362 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8363 errorf(&value->base.source_position,
8364 "cannot throw pointer to incomplete type '%T'", orig_type);
8372 result->unary.value = value;
8377 static bool check_pointer_arithmetic(const source_position_t *source_position,
8378 type_t *pointer_type,
8379 type_t *orig_pointer_type)
8381 type_t *points_to = pointer_type->pointer.points_to;
8382 points_to = skip_typeref(points_to);
8384 if (is_type_incomplete(points_to)) {
8385 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8386 errorf(source_position,
8387 "arithmetic with pointer to incomplete type '%T' not allowed",
8390 } else if (warning.pointer_arith) {
8391 warningf(source_position,
8392 "pointer of type '%T' used in arithmetic",
8395 } else if (is_type_function(points_to)) {
8397 errorf(source_position,
8398 "arithmetic with pointer to function type '%T' not allowed",
8401 } else if (warning.pointer_arith) {
8402 warningf(source_position,
8403 "pointer to a function '%T' used in arithmetic",
8410 static bool is_lvalue(const expression_t *expression)
8412 /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */
8413 switch (expression->kind) {
8414 case EXPR_REFERENCE:
8415 case EXPR_ARRAY_ACCESS:
8417 case EXPR_UNARY_DEREFERENCE:
8421 type_t *type = skip_typeref(expression->base.type);
8423 /* ISO/IEC 14882:1998(E) §3.10:3 */
8424 is_type_reference(type) ||
8425 /* Claim it is an lvalue, if the type is invalid. There was a parse
8426 * error before, which maybe prevented properly recognizing it as
8428 !is_type_valid(type);
8433 static void semantic_incdec(unary_expression_t *expression)
8435 type_t *const orig_type = expression->value->base.type;
8436 type_t *const type = skip_typeref(orig_type);
8437 if (is_type_pointer(type)) {
8438 if (!check_pointer_arithmetic(&expression->base.source_position,
8442 } else if (!is_type_real(type) && is_type_valid(type)) {
8443 /* TODO: improve error message */
8444 errorf(&expression->base.source_position,
8445 "operation needs an arithmetic or pointer type");
8448 if (!is_lvalue(expression->value)) {
8449 /* TODO: improve error message */
8450 errorf(&expression->base.source_position, "lvalue required as operand");
8452 expression->base.type = orig_type;
8455 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8457 type_t *const orig_type = expression->value->base.type;
8458 type_t *const type = skip_typeref(orig_type);
8459 if (!is_type_arithmetic(type)) {
8460 if (is_type_valid(type)) {
8461 /* TODO: improve error message */
8462 errorf(&expression->base.source_position,
8463 "operation needs an arithmetic type");
8468 expression->base.type = orig_type;
8471 static void semantic_unexpr_plus(unary_expression_t *expression)
8473 semantic_unexpr_arithmetic(expression);
8474 if (warning.traditional)
8475 warningf(&expression->base.source_position,
8476 "traditional C rejects the unary plus operator");
8479 static void semantic_not(unary_expression_t *expression)
8481 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8482 semantic_condition(expression->value, "operand of !");
8483 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8486 static void semantic_unexpr_integer(unary_expression_t *expression)
8488 type_t *const orig_type = expression->value->base.type;
8489 type_t *const type = skip_typeref(orig_type);
8490 if (!is_type_integer(type)) {
8491 if (is_type_valid(type)) {
8492 errorf(&expression->base.source_position,
8493 "operand of ~ must be of integer type");
8498 expression->base.type = orig_type;
8501 static void semantic_dereference(unary_expression_t *expression)
8503 type_t *const orig_type = expression->value->base.type;
8504 type_t *const type = skip_typeref(orig_type);
8505 if (!is_type_pointer(type)) {
8506 if (is_type_valid(type)) {
8507 errorf(&expression->base.source_position,
8508 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8513 type_t *result_type = type->pointer.points_to;
8514 result_type = automatic_type_conversion(result_type);
8515 expression->base.type = result_type;
8519 * Record that an address is taken (expression represents an lvalue).
8521 * @param expression the expression
8522 * @param may_be_register if true, the expression might be an register
8524 static void set_address_taken(expression_t *expression, bool may_be_register)
8526 if (expression->kind != EXPR_REFERENCE)
8529 entity_t *const entity = expression->reference.entity;
8531 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8534 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8535 && !may_be_register) {
8536 errorf(&expression->base.source_position,
8537 "address of register %s '%Y' requested",
8538 get_entity_kind_name(entity->kind), entity->base.symbol);
8541 if (entity->kind == ENTITY_VARIABLE) {
8542 entity->variable.address_taken = true;
8544 assert(entity->kind == ENTITY_PARAMETER);
8545 entity->parameter.address_taken = true;
8550 * Check the semantic of the address taken expression.
8552 static void semantic_take_addr(unary_expression_t *expression)
8554 expression_t *value = expression->value;
8555 value->base.type = revert_automatic_type_conversion(value);
8557 type_t *orig_type = value->base.type;
8558 type_t *type = skip_typeref(orig_type);
8559 if (!is_type_valid(type))
8563 if (!is_lvalue(value)) {
8564 errorf(&expression->base.source_position, "'&' requires an lvalue");
8566 if (type->kind == TYPE_BITFIELD) {
8567 errorf(&expression->base.source_position,
8568 "'&' not allowed on object with bitfield type '%T'",
8572 set_address_taken(value, false);
8574 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8577 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8578 static expression_t *parse_##unexpression_type(void) \
8580 expression_t *unary_expression \
8581 = allocate_expression_zero(unexpression_type); \
8583 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8585 sfunc(&unary_expression->unary); \
8587 return unary_expression; \
8590 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8591 semantic_unexpr_arithmetic)
8592 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8593 semantic_unexpr_plus)
8594 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8596 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8597 semantic_dereference)
8598 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8600 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8601 semantic_unexpr_integer)
8602 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8604 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8607 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8609 static expression_t *parse_##unexpression_type(expression_t *left) \
8611 expression_t *unary_expression \
8612 = allocate_expression_zero(unexpression_type); \
8614 unary_expression->unary.value = left; \
8616 sfunc(&unary_expression->unary); \
8618 return unary_expression; \
8621 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8622 EXPR_UNARY_POSTFIX_INCREMENT,
8624 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8625 EXPR_UNARY_POSTFIX_DECREMENT,
8628 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8630 /* TODO: handle complex + imaginary types */
8632 type_left = get_unqualified_type(type_left);
8633 type_right = get_unqualified_type(type_right);
8635 /* § 6.3.1.8 Usual arithmetic conversions */
8636 if (type_left == type_long_double || type_right == type_long_double) {
8637 return type_long_double;
8638 } else if (type_left == type_double || type_right == type_double) {
8640 } else if (type_left == type_float || type_right == type_float) {
8644 type_left = promote_integer(type_left);
8645 type_right = promote_integer(type_right);
8647 if (type_left == type_right)
8650 bool const signed_left = is_type_signed(type_left);
8651 bool const signed_right = is_type_signed(type_right);
8652 int const rank_left = get_rank(type_left);
8653 int const rank_right = get_rank(type_right);
8655 if (signed_left == signed_right)
8656 return rank_left >= rank_right ? type_left : type_right;
8665 u_rank = rank_right;
8666 u_type = type_right;
8668 s_rank = rank_right;
8669 s_type = type_right;
8674 if (u_rank >= s_rank)
8677 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8679 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8680 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8684 case ATOMIC_TYPE_INT: return type_unsigned_int;
8685 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8686 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8688 default: panic("invalid atomic type");
8693 * Check the semantic restrictions for a binary expression.
8695 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8697 expression_t *const left = expression->left;
8698 expression_t *const right = expression->right;
8699 type_t *const orig_type_left = left->base.type;
8700 type_t *const orig_type_right = right->base.type;
8701 type_t *const type_left = skip_typeref(orig_type_left);
8702 type_t *const type_right = skip_typeref(orig_type_right);
8704 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8705 /* TODO: improve error message */
8706 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8707 errorf(&expression->base.source_position,
8708 "operation needs arithmetic types");
8713 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8714 expression->left = create_implicit_cast(left, arithmetic_type);
8715 expression->right = create_implicit_cast(right, arithmetic_type);
8716 expression->base.type = arithmetic_type;
8719 static void warn_div_by_zero(binary_expression_t const *const expression)
8721 if (!warning.div_by_zero ||
8722 !is_type_integer(expression->base.type))
8725 expression_t const *const right = expression->right;
8726 /* The type of the right operand can be different for /= */
8727 if (is_type_integer(right->base.type) &&
8728 is_constant_expression(right) &&
8729 fold_constant(right) == 0) {
8730 warningf(&expression->base.source_position, "division by zero");
8735 * Check the semantic restrictions for a div/mod expression.
8737 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
8738 semantic_binexpr_arithmetic(expression);
8739 warn_div_by_zero(expression);
8742 static void semantic_shift_op(binary_expression_t *expression)
8744 expression_t *const left = expression->left;
8745 expression_t *const right = expression->right;
8746 type_t *const orig_type_left = left->base.type;
8747 type_t *const orig_type_right = right->base.type;
8748 type_t * type_left = skip_typeref(orig_type_left);
8749 type_t * type_right = skip_typeref(orig_type_right);
8751 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8752 /* TODO: improve error message */
8753 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8754 errorf(&expression->base.source_position,
8755 "operands of shift operation must have integer types");
8760 type_left = promote_integer(type_left);
8761 type_right = promote_integer(type_right);
8763 expression->left = create_implicit_cast(left, type_left);
8764 expression->right = create_implicit_cast(right, type_right);
8765 expression->base.type = type_left;
8768 static void semantic_add(binary_expression_t *expression)
8770 expression_t *const left = expression->left;
8771 expression_t *const right = expression->right;
8772 type_t *const orig_type_left = left->base.type;
8773 type_t *const orig_type_right = right->base.type;
8774 type_t *const type_left = skip_typeref(orig_type_left);
8775 type_t *const type_right = skip_typeref(orig_type_right);
8778 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8779 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8780 expression->left = create_implicit_cast(left, arithmetic_type);
8781 expression->right = create_implicit_cast(right, arithmetic_type);
8782 expression->base.type = arithmetic_type;
8784 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8785 check_pointer_arithmetic(&expression->base.source_position,
8786 type_left, orig_type_left);
8787 expression->base.type = type_left;
8788 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8789 check_pointer_arithmetic(&expression->base.source_position,
8790 type_right, orig_type_right);
8791 expression->base.type = type_right;
8792 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8793 errorf(&expression->base.source_position,
8794 "invalid operands to binary + ('%T', '%T')",
8795 orig_type_left, orig_type_right);
8799 static void semantic_sub(binary_expression_t *expression)
8801 expression_t *const left = expression->left;
8802 expression_t *const right = expression->right;
8803 type_t *const orig_type_left = left->base.type;
8804 type_t *const orig_type_right = right->base.type;
8805 type_t *const type_left = skip_typeref(orig_type_left);
8806 type_t *const type_right = skip_typeref(orig_type_right);
8807 source_position_t const *const pos = &expression->base.source_position;
8810 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8811 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8812 expression->left = create_implicit_cast(left, arithmetic_type);
8813 expression->right = create_implicit_cast(right, arithmetic_type);
8814 expression->base.type = arithmetic_type;
8816 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8817 check_pointer_arithmetic(&expression->base.source_position,
8818 type_left, orig_type_left);
8819 expression->base.type = type_left;
8820 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8821 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8822 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8823 if (!types_compatible(unqual_left, unqual_right)) {
8825 "subtracting pointers to incompatible types '%T' and '%T'",
8826 orig_type_left, orig_type_right);
8827 } else if (!is_type_object(unqual_left)) {
8828 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8829 errorf(pos, "subtracting pointers to non-object types '%T'",
8831 } else if (warning.other) {
8832 warningf(pos, "subtracting pointers to void");
8835 expression->base.type = type_ptrdiff_t;
8836 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8837 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8838 orig_type_left, orig_type_right);
8842 static void warn_string_literal_address(expression_t const* expr)
8844 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8845 expr = expr->unary.value;
8846 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8848 expr = expr->unary.value;
8851 if (expr->kind == EXPR_STRING_LITERAL ||
8852 expr->kind == EXPR_WIDE_STRING_LITERAL) {
8853 warningf(&expr->base.source_position,
8854 "comparison with string literal results in unspecified behaviour");
8859 * Check the semantics of comparison expressions.
8861 * @param expression The expression to check.
8863 static void semantic_comparison(binary_expression_t *expression)
8865 expression_t *left = expression->left;
8866 expression_t *right = expression->right;
8868 if (warning.address) {
8869 warn_string_literal_address(left);
8870 warn_string_literal_address(right);
8872 expression_t const* const func_left = get_reference_address(left);
8873 if (func_left != NULL && is_null_pointer_constant(right)) {
8874 warningf(&expression->base.source_position,
8875 "the address of '%Y' will never be NULL",
8876 func_left->reference.entity->base.symbol);
8879 expression_t const* const func_right = get_reference_address(right);
8880 if (func_right != NULL && is_null_pointer_constant(right)) {
8881 warningf(&expression->base.source_position,
8882 "the address of '%Y' will never be NULL",
8883 func_right->reference.entity->base.symbol);
8887 type_t *orig_type_left = left->base.type;
8888 type_t *orig_type_right = right->base.type;
8889 type_t *type_left = skip_typeref(orig_type_left);
8890 type_t *type_right = skip_typeref(orig_type_right);
8892 /* TODO non-arithmetic types */
8893 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8894 /* test for signed vs unsigned compares */
8895 if (warning.sign_compare &&
8896 (expression->base.kind != EXPR_BINARY_EQUAL &&
8897 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
8898 (is_type_signed(type_left) != is_type_signed(type_right))) {
8900 /* check if 1 of the operands is a constant, in this case we just
8901 * check wether we can safely represent the resulting constant in
8902 * the type of the other operand. */
8903 expression_t *const_expr = NULL;
8904 expression_t *other_expr = NULL;
8906 if (is_constant_expression(left)) {
8909 } else if (is_constant_expression(right)) {
8914 if (const_expr != NULL) {
8915 type_t *other_type = skip_typeref(other_expr->base.type);
8916 long val = fold_constant(const_expr);
8917 /* TODO: check if val can be represented by other_type */
8921 warningf(&expression->base.source_position,
8922 "comparison between signed and unsigned");
8924 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8925 expression->left = create_implicit_cast(left, arithmetic_type);
8926 expression->right = create_implicit_cast(right, arithmetic_type);
8927 expression->base.type = arithmetic_type;
8928 if (warning.float_equal &&
8929 (expression->base.kind == EXPR_BINARY_EQUAL ||
8930 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8931 is_type_float(arithmetic_type)) {
8932 warningf(&expression->base.source_position,
8933 "comparing floating point with == or != is unsafe");
8935 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8936 /* TODO check compatibility */
8937 } else if (is_type_pointer(type_left)) {
8938 expression->right = create_implicit_cast(right, type_left);
8939 } else if (is_type_pointer(type_right)) {
8940 expression->left = create_implicit_cast(left, type_right);
8941 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8942 type_error_incompatible("invalid operands in comparison",
8943 &expression->base.source_position,
8944 type_left, type_right);
8946 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8950 * Checks if a compound type has constant fields.
8952 static bool has_const_fields(const compound_type_t *type)
8954 compound_t *compound = type->compound;
8955 entity_t *entry = compound->members.entities;
8957 for (; entry != NULL; entry = entry->base.next) {
8958 if (!is_declaration(entry))
8961 const type_t *decl_type = skip_typeref(entry->declaration.type);
8962 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8969 static bool is_valid_assignment_lhs(expression_t const* const left)
8971 type_t *const orig_type_left = revert_automatic_type_conversion(left);
8972 type_t *const type_left = skip_typeref(orig_type_left);
8974 if (!is_lvalue(left)) {
8975 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8980 if (left->kind == EXPR_REFERENCE
8981 && left->reference.entity->kind == ENTITY_FUNCTION) {
8982 errorf(HERE, "cannot assign to function '%E'", left);
8986 if (is_type_array(type_left)) {
8987 errorf(HERE, "cannot assign to array '%E'", left);
8990 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8991 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8995 if (is_type_incomplete(type_left)) {
8996 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8997 left, orig_type_left);
9000 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9001 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9002 left, orig_type_left);
9009 static void semantic_arithmetic_assign(binary_expression_t *expression)
9011 expression_t *left = expression->left;
9012 expression_t *right = expression->right;
9013 type_t *orig_type_left = left->base.type;
9014 type_t *orig_type_right = right->base.type;
9016 if (!is_valid_assignment_lhs(left))
9019 type_t *type_left = skip_typeref(orig_type_left);
9020 type_t *type_right = skip_typeref(orig_type_right);
9022 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9023 /* TODO: improve error message */
9024 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9025 errorf(&expression->base.source_position,
9026 "operation needs arithmetic types");
9031 /* combined instructions are tricky. We can't create an implicit cast on
9032 * the left side, because we need the uncasted form for the store.
9033 * The ast2firm pass has to know that left_type must be right_type
9034 * for the arithmetic operation and create a cast by itself */
9035 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9036 expression->right = create_implicit_cast(right, arithmetic_type);
9037 expression->base.type = type_left;
9040 static void semantic_divmod_assign(binary_expression_t *expression)
9042 semantic_arithmetic_assign(expression);
9043 warn_div_by_zero(expression);
9046 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9048 expression_t *const left = expression->left;
9049 expression_t *const right = expression->right;
9050 type_t *const orig_type_left = left->base.type;
9051 type_t *const orig_type_right = right->base.type;
9052 type_t *const type_left = skip_typeref(orig_type_left);
9053 type_t *const type_right = skip_typeref(orig_type_right);
9055 if (!is_valid_assignment_lhs(left))
9058 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9059 /* combined instructions are tricky. We can't create an implicit cast on
9060 * the left side, because we need the uncasted form for the store.
9061 * The ast2firm pass has to know that left_type must be right_type
9062 * for the arithmetic operation and create a cast by itself */
9063 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9064 expression->right = create_implicit_cast(right, arithmetic_type);
9065 expression->base.type = type_left;
9066 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9067 check_pointer_arithmetic(&expression->base.source_position,
9068 type_left, orig_type_left);
9069 expression->base.type = type_left;
9070 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9071 errorf(&expression->base.source_position,
9072 "incompatible types '%T' and '%T' in assignment",
9073 orig_type_left, orig_type_right);
9078 * Check the semantic restrictions of a logical expression.
9080 static void semantic_logical_op(binary_expression_t *expression)
9082 /* §6.5.13:2 Each of the operands shall have scalar type.
9083 * §6.5.14:2 Each of the operands shall have scalar type. */
9084 semantic_condition(expression->left, "left operand of logical operator");
9085 semantic_condition(expression->right, "right operand of logical operator");
9086 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9090 * Check the semantic restrictions of a binary assign expression.
9092 static void semantic_binexpr_assign(binary_expression_t *expression)
9094 expression_t *left = expression->left;
9095 type_t *orig_type_left = left->base.type;
9097 if (!is_valid_assignment_lhs(left))
9100 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9101 report_assign_error(error, orig_type_left, expression->right,
9102 "assignment", &left->base.source_position);
9103 expression->right = create_implicit_cast(expression->right, orig_type_left);
9104 expression->base.type = orig_type_left;
9108 * Determine if the outermost operation (or parts thereof) of the given
9109 * expression has no effect in order to generate a warning about this fact.
9110 * Therefore in some cases this only examines some of the operands of the
9111 * expression (see comments in the function and examples below).
9113 * f() + 23; // warning, because + has no effect
9114 * x || f(); // no warning, because x controls execution of f()
9115 * x ? y : f(); // warning, because y has no effect
9116 * (void)x; // no warning to be able to suppress the warning
9117 * This function can NOT be used for an "expression has definitely no effect"-
9119 static bool expression_has_effect(const expression_t *const expr)
9121 switch (expr->kind) {
9122 case EXPR_UNKNOWN: break;
9123 case EXPR_INVALID: return true; /* do NOT warn */
9124 case EXPR_REFERENCE: return false;
9125 case EXPR_REFERENCE_ENUM_VALUE: return false;
9126 /* suppress the warning for microsoft __noop operations */
9127 case EXPR_CONST: return expr->conste.is_ms_noop;
9128 case EXPR_CHARACTER_CONSTANT: return false;
9129 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9130 case EXPR_STRING_LITERAL: return false;
9131 case EXPR_WIDE_STRING_LITERAL: return false;
9132 case EXPR_LABEL_ADDRESS: return false;
9135 const call_expression_t *const call = &expr->call;
9136 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9139 switch (call->function->builtin_symbol.symbol->ID) {
9140 case T___builtin_va_end: return true;
9141 default: return false;
9145 /* Generate the warning if either the left or right hand side of a
9146 * conditional expression has no effect */
9147 case EXPR_CONDITIONAL: {
9148 const conditional_expression_t *const cond = &expr->conditional;
9150 expression_has_effect(cond->true_expression) &&
9151 expression_has_effect(cond->false_expression);
9154 case EXPR_SELECT: return false;
9155 case EXPR_ARRAY_ACCESS: return false;
9156 case EXPR_SIZEOF: return false;
9157 case EXPR_CLASSIFY_TYPE: return false;
9158 case EXPR_ALIGNOF: return false;
9160 case EXPR_FUNCNAME: return false;
9161 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9162 case EXPR_BUILTIN_CONSTANT_P: return false;
9163 case EXPR_BUILTIN_PREFETCH: return true;
9164 case EXPR_OFFSETOF: return false;
9165 case EXPR_VA_START: return true;
9166 case EXPR_VA_ARG: return true;
9167 case EXPR_STATEMENT: return true; // TODO
9168 case EXPR_COMPOUND_LITERAL: return false;
9170 case EXPR_UNARY_NEGATE: return false;
9171 case EXPR_UNARY_PLUS: return false;
9172 case EXPR_UNARY_BITWISE_NEGATE: return false;
9173 case EXPR_UNARY_NOT: return false;
9174 case EXPR_UNARY_DEREFERENCE: return false;
9175 case EXPR_UNARY_TAKE_ADDRESS: return false;
9176 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9177 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9178 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9179 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9181 /* Treat void casts as if they have an effect in order to being able to
9182 * suppress the warning */
9183 case EXPR_UNARY_CAST: {
9184 type_t *const type = skip_typeref(expr->base.type);
9185 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9188 case EXPR_UNARY_CAST_IMPLICIT: return true;
9189 case EXPR_UNARY_ASSUME: return true;
9190 case EXPR_UNARY_DELETE: return true;
9191 case EXPR_UNARY_DELETE_ARRAY: return true;
9192 case EXPR_UNARY_THROW: return true;
9194 case EXPR_BINARY_ADD: return false;
9195 case EXPR_BINARY_SUB: return false;
9196 case EXPR_BINARY_MUL: return false;
9197 case EXPR_BINARY_DIV: return false;
9198 case EXPR_BINARY_MOD: return false;
9199 case EXPR_BINARY_EQUAL: return false;
9200 case EXPR_BINARY_NOTEQUAL: return false;
9201 case EXPR_BINARY_LESS: return false;
9202 case EXPR_BINARY_LESSEQUAL: return false;
9203 case EXPR_BINARY_GREATER: return false;
9204 case EXPR_BINARY_GREATEREQUAL: return false;
9205 case EXPR_BINARY_BITWISE_AND: return false;
9206 case EXPR_BINARY_BITWISE_OR: return false;
9207 case EXPR_BINARY_BITWISE_XOR: return false;
9208 case EXPR_BINARY_SHIFTLEFT: return false;
9209 case EXPR_BINARY_SHIFTRIGHT: return false;
9210 case EXPR_BINARY_ASSIGN: return true;
9211 case EXPR_BINARY_MUL_ASSIGN: return true;
9212 case EXPR_BINARY_DIV_ASSIGN: return true;
9213 case EXPR_BINARY_MOD_ASSIGN: return true;
9214 case EXPR_BINARY_ADD_ASSIGN: return true;
9215 case EXPR_BINARY_SUB_ASSIGN: return true;
9216 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9217 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9218 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9219 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9220 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9222 /* Only examine the right hand side of && and ||, because the left hand
9223 * side already has the effect of controlling the execution of the right
9225 case EXPR_BINARY_LOGICAL_AND:
9226 case EXPR_BINARY_LOGICAL_OR:
9227 /* Only examine the right hand side of a comma expression, because the left
9228 * hand side has a separate warning */
9229 case EXPR_BINARY_COMMA:
9230 return expression_has_effect(expr->binary.right);
9232 case EXPR_BINARY_BUILTIN_EXPECT: return true;
9233 case EXPR_BINARY_ISGREATER: return false;
9234 case EXPR_BINARY_ISGREATEREQUAL: return false;
9235 case EXPR_BINARY_ISLESS: return false;
9236 case EXPR_BINARY_ISLESSEQUAL: return false;
9237 case EXPR_BINARY_ISLESSGREATER: return false;
9238 case EXPR_BINARY_ISUNORDERED: return false;
9241 internal_errorf(HERE, "unexpected expression");
9244 static void semantic_comma(binary_expression_t *expression)
9246 if (warning.unused_value) {
9247 const expression_t *const left = expression->left;
9248 if (!expression_has_effect(left)) {
9249 warningf(&left->base.source_position,
9250 "left-hand operand of comma expression has no effect");
9253 expression->base.type = expression->right->base.type;
9257 * @param prec_r precedence of the right operand
9259 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9260 static expression_t *parse_##binexpression_type(expression_t *left) \
9262 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9263 binexpr->binary.left = left; \
9266 expression_t *right = parse_sub_expression(prec_r); \
9268 binexpr->binary.right = right; \
9269 sfunc(&binexpr->binary); \
9274 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9275 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9276 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9277 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9278 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9279 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9280 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9281 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9282 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9283 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9284 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9285 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9286 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9287 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9288 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9289 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9290 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9291 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9292 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9293 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9294 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9295 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9296 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9297 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9298 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9299 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9300 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9301 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9302 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9303 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9306 static expression_t *parse_sub_expression(precedence_t precedence)
9308 if (token.type < 0) {
9309 return expected_expression_error();
9312 expression_parser_function_t *parser
9313 = &expression_parsers[token.type];
9314 source_position_t source_position = token.source_position;
9317 if (parser->parser != NULL) {
9318 left = parser->parser();
9320 left = parse_primary_expression();
9322 assert(left != NULL);
9323 left->base.source_position = source_position;
9326 if (token.type < 0) {
9327 return expected_expression_error();
9330 parser = &expression_parsers[token.type];
9331 if (parser->infix_parser == NULL)
9333 if (parser->infix_precedence < precedence)
9336 left = parser->infix_parser(left);
9338 assert(left != NULL);
9339 assert(left->kind != EXPR_UNKNOWN);
9340 left->base.source_position = source_position;
9347 * Parse an expression.
9349 static expression_t *parse_expression(void)
9351 return parse_sub_expression(PREC_EXPRESSION);
9355 * Register a parser for a prefix-like operator.
9357 * @param parser the parser function
9358 * @param token_type the token type of the prefix token
9360 static void register_expression_parser(parse_expression_function parser,
9363 expression_parser_function_t *entry = &expression_parsers[token_type];
9365 if (entry->parser != NULL) {
9366 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9367 panic("trying to register multiple expression parsers for a token");
9369 entry->parser = parser;
9373 * Register a parser for an infix operator with given precedence.
9375 * @param parser the parser function
9376 * @param token_type the token type of the infix operator
9377 * @param precedence the precedence of the operator
9379 static void register_infix_parser(parse_expression_infix_function parser,
9380 int token_type, unsigned precedence)
9382 expression_parser_function_t *entry = &expression_parsers[token_type];
9384 if (entry->infix_parser != NULL) {
9385 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9386 panic("trying to register multiple infix expression parsers for a "
9389 entry->infix_parser = parser;
9390 entry->infix_precedence = precedence;
9394 * Initialize the expression parsers.
9396 static void init_expression_parsers(void)
9398 memset(&expression_parsers, 0, sizeof(expression_parsers));
9400 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9401 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9402 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9403 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9404 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9405 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9406 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9407 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9408 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9409 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9410 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9411 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9412 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9413 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9414 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9415 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9416 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9417 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9418 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9419 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9420 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9421 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9422 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9423 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9424 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9425 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9426 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9427 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9428 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9429 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9430 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9431 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9432 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9433 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9434 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9435 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9436 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9438 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9439 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9440 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9441 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9442 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9443 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9444 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9445 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9446 register_expression_parser(parse_sizeof, T_sizeof);
9447 register_expression_parser(parse_alignof, T___alignof__);
9448 register_expression_parser(parse_extension, T___extension__);
9449 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9450 register_expression_parser(parse_delete, T_delete);
9451 register_expression_parser(parse_throw, T_throw);
9455 * Parse a asm statement arguments specification.
9457 static asm_argument_t *parse_asm_arguments(bool is_out)
9459 asm_argument_t *result = NULL;
9460 asm_argument_t **anchor = &result;
9462 while (token.type == T_STRING_LITERAL || token.type == '[') {
9463 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9464 memset(argument, 0, sizeof(argument[0]));
9466 if (token.type == '[') {
9468 if (token.type != T_IDENTIFIER) {
9469 parse_error_expected("while parsing asm argument",
9470 T_IDENTIFIER, NULL);
9473 argument->symbol = token.v.symbol;
9478 argument->constraints = parse_string_literals();
9480 add_anchor_token(')');
9481 expression_t *expression = parse_expression();
9482 rem_anchor_token(')');
9484 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9485 * change size or type representation (e.g. int -> long is ok, but
9486 * int -> float is not) */
9487 if (expression->kind == EXPR_UNARY_CAST) {
9488 type_t *const type = expression->base.type;
9489 type_kind_t const kind = type->kind;
9490 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9493 if (kind == TYPE_ATOMIC) {
9494 atomic_type_kind_t const akind = type->atomic.akind;
9495 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9496 size = get_atomic_type_size(akind);
9498 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9499 size = get_atomic_type_size(get_intptr_kind());
9503 expression_t *const value = expression->unary.value;
9504 type_t *const value_type = value->base.type;
9505 type_kind_t const value_kind = value_type->kind;
9507 unsigned value_flags;
9508 unsigned value_size;
9509 if (value_kind == TYPE_ATOMIC) {
9510 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9511 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9512 value_size = get_atomic_type_size(value_akind);
9513 } else if (value_kind == TYPE_POINTER) {
9514 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9515 value_size = get_atomic_type_size(get_intptr_kind());
9520 if (value_flags != flags || value_size != size)
9524 } while (expression->kind == EXPR_UNARY_CAST);
9528 if (!is_lvalue(expression)) {
9529 errorf(&expression->base.source_position,
9530 "asm output argument is not an lvalue");
9533 if (argument->constraints.begin[0] == '+')
9534 mark_vars_read(expression, NULL);
9536 mark_vars_read(expression, NULL);
9538 argument->expression = expression;
9541 set_address_taken(expression, true);
9544 anchor = &argument->next;
9546 if (token.type != ',')
9557 * Parse a asm statement clobber specification.
9559 static asm_clobber_t *parse_asm_clobbers(void)
9561 asm_clobber_t *result = NULL;
9562 asm_clobber_t *last = NULL;
9564 while (token.type == T_STRING_LITERAL) {
9565 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9566 clobber->clobber = parse_string_literals();
9569 last->next = clobber;
9575 if (token.type != ',')
9584 * Parse an asm statement.
9586 static statement_t *parse_asm_statement(void)
9588 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9589 asm_statement_t *asm_statement = &statement->asms;
9593 if (token.type == T_volatile) {
9595 asm_statement->is_volatile = true;
9599 add_anchor_token(')');
9600 add_anchor_token(':');
9601 asm_statement->asm_text = parse_string_literals();
9603 if (token.type != ':') {
9604 rem_anchor_token(':');
9609 asm_statement->outputs = parse_asm_arguments(true);
9610 if (token.type != ':') {
9611 rem_anchor_token(':');
9616 asm_statement->inputs = parse_asm_arguments(false);
9617 if (token.type != ':') {
9618 rem_anchor_token(':');
9621 rem_anchor_token(':');
9624 asm_statement->clobbers = parse_asm_clobbers();
9627 rem_anchor_token(')');
9631 if (asm_statement->outputs == NULL) {
9632 /* GCC: An 'asm' instruction without any output operands will be treated
9633 * identically to a volatile 'asm' instruction. */
9634 asm_statement->is_volatile = true;
9639 return create_invalid_statement();
9643 * Parse a case statement.
9645 static statement_t *parse_case_statement(void)
9647 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9648 source_position_t *const pos = &statement->base.source_position;
9652 expression_t *const expression = parse_expression();
9653 statement->case_label.expression = expression;
9654 if (!is_constant_expression(expression)) {
9655 /* This check does not prevent the error message in all cases of an
9656 * prior error while parsing the expression. At least it catches the
9657 * common case of a mistyped enum entry. */
9658 if (is_type_valid(skip_typeref(expression->base.type))) {
9659 errorf(pos, "case label does not reduce to an integer constant");
9661 statement->case_label.is_bad = true;
9663 long const val = fold_constant(expression);
9664 statement->case_label.first_case = val;
9665 statement->case_label.last_case = val;
9669 if (token.type == T_DOTDOTDOT) {
9671 expression_t *const end_range = parse_expression();
9672 statement->case_label.end_range = end_range;
9673 if (!is_constant_expression(end_range)) {
9674 /* This check does not prevent the error message in all cases of an
9675 * prior error while parsing the expression. At least it catches the
9676 * common case of a mistyped enum entry. */
9677 if (is_type_valid(skip_typeref(end_range->base.type))) {
9678 errorf(pos, "case range does not reduce to an integer constant");
9680 statement->case_label.is_bad = true;
9682 long const val = fold_constant(end_range);
9683 statement->case_label.last_case = val;
9685 if (warning.other && val < statement->case_label.first_case) {
9686 statement->case_label.is_empty_range = true;
9687 warningf(pos, "empty range specified");
9693 PUSH_PARENT(statement);
9698 if (current_switch != NULL) {
9699 if (! statement->case_label.is_bad) {
9700 /* Check for duplicate case values */
9701 case_label_statement_t *c = &statement->case_label;
9702 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9703 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9706 if (c->last_case < l->first_case || c->first_case > l->last_case)
9709 errorf(pos, "duplicate case value (previously used %P)",
9710 &l->base.source_position);
9714 /* link all cases into the switch statement */
9715 if (current_switch->last_case == NULL) {
9716 current_switch->first_case = &statement->case_label;
9718 current_switch->last_case->next = &statement->case_label;
9720 current_switch->last_case = &statement->case_label;
9722 errorf(pos, "case label not within a switch statement");
9725 statement_t *const inner_stmt = parse_statement();
9726 statement->case_label.statement = inner_stmt;
9727 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9728 errorf(&inner_stmt->base.source_position, "declaration after case label");
9736 * Parse a default statement.
9738 static statement_t *parse_default_statement(void)
9740 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9744 PUSH_PARENT(statement);
9747 if (current_switch != NULL) {
9748 const case_label_statement_t *def_label = current_switch->default_label;
9749 if (def_label != NULL) {
9750 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9751 &def_label->base.source_position);
9753 current_switch->default_label = &statement->case_label;
9755 /* link all cases into the switch statement */
9756 if (current_switch->last_case == NULL) {
9757 current_switch->first_case = &statement->case_label;
9759 current_switch->last_case->next = &statement->case_label;
9761 current_switch->last_case = &statement->case_label;
9764 errorf(&statement->base.source_position,
9765 "'default' label not within a switch statement");
9768 statement_t *const inner_stmt = parse_statement();
9769 statement->case_label.statement = inner_stmt;
9770 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9771 errorf(&inner_stmt->base.source_position, "declaration after default label");
9778 return create_invalid_statement();
9782 * Parse a label statement.
9784 static statement_t *parse_label_statement(void)
9786 assert(token.type == T_IDENTIFIER);
9787 symbol_t *symbol = token.v.symbol;
9788 label_t *label = get_label(symbol);
9790 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9791 statement->label.label = label;
9795 PUSH_PARENT(statement);
9797 /* if statement is already set then the label is defined twice,
9798 * otherwise it was just mentioned in a goto/local label declaration so far
9800 if (label->statement != NULL) {
9801 errorf(HERE, "duplicate label '%Y' (declared %P)",
9802 symbol, &label->base.source_position);
9804 label->base.source_position = token.source_position;
9805 label->statement = statement;
9810 if (token.type == '}') {
9811 /* TODO only warn? */
9812 if (warning.other && false) {
9813 warningf(HERE, "label at end of compound statement");
9814 statement->label.statement = create_empty_statement();
9816 errorf(HERE, "label at end of compound statement");
9817 statement->label.statement = create_invalid_statement();
9819 } else if (token.type == ';') {
9820 /* Eat an empty statement here, to avoid the warning about an empty
9821 * statement after a label. label:; is commonly used to have a label
9822 * before a closing brace. */
9823 statement->label.statement = create_empty_statement();
9826 statement_t *const inner_stmt = parse_statement();
9827 statement->label.statement = inner_stmt;
9828 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9829 errorf(&inner_stmt->base.source_position, "declaration after label");
9833 /* remember the labels in a list for later checking */
9834 *label_anchor = &statement->label;
9835 label_anchor = &statement->label.next;
9842 * Parse an if statement.
9844 static statement_t *parse_if(void)
9846 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9850 PUSH_PARENT(statement);
9852 add_anchor_token('{');
9855 add_anchor_token(')');
9856 expression_t *const expr = parse_expression();
9857 statement->ifs.condition = expr;
9858 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9860 semantic_condition(expr, "condition of 'if'-statment");
9861 mark_vars_read(expr, NULL);
9862 rem_anchor_token(')');
9866 rem_anchor_token('{');
9868 add_anchor_token(T_else);
9869 statement->ifs.true_statement = parse_statement();
9870 rem_anchor_token(T_else);
9872 if (token.type == T_else) {
9874 statement->ifs.false_statement = parse_statement();
9882 * Check that all enums are handled in a switch.
9884 * @param statement the switch statement to check
9886 static void check_enum_cases(const switch_statement_t *statement) {
9887 const type_t *type = skip_typeref(statement->expression->base.type);
9888 if (! is_type_enum(type))
9890 const enum_type_t *enumt = &type->enumt;
9892 /* if we have a default, no warnings */
9893 if (statement->default_label != NULL)
9896 /* FIXME: calculation of value should be done while parsing */
9897 /* TODO: quadratic algorithm here. Change to an n log n one */
9898 long last_value = -1;
9899 const entity_t *entry = enumt->enume->base.next;
9900 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9901 entry = entry->base.next) {
9902 const expression_t *expression = entry->enum_value.value;
9903 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9905 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9906 if (l->expression == NULL)
9908 if (l->first_case <= value && value <= l->last_case) {
9914 warningf(&statement->base.source_position,
9915 "enumeration value '%Y' not handled in switch",
9916 entry->base.symbol);
9923 * Parse a switch statement.
9925 static statement_t *parse_switch(void)
9927 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9931 PUSH_PARENT(statement);
9934 add_anchor_token(')');
9935 expression_t *const expr = parse_expression();
9936 mark_vars_read(expr, NULL);
9937 type_t * type = skip_typeref(expr->base.type);
9938 if (is_type_integer(type)) {
9939 type = promote_integer(type);
9940 if (warning.traditional) {
9941 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9942 warningf(&expr->base.source_position,
9943 "'%T' switch expression not converted to '%T' in ISO C",
9947 } else if (is_type_valid(type)) {
9948 errorf(&expr->base.source_position,
9949 "switch quantity is not an integer, but '%T'", type);
9950 type = type_error_type;
9952 statement->switchs.expression = create_implicit_cast(expr, type);
9954 rem_anchor_token(')');
9956 switch_statement_t *rem = current_switch;
9957 current_switch = &statement->switchs;
9958 statement->switchs.body = parse_statement();
9959 current_switch = rem;
9961 if (warning.switch_default &&
9962 statement->switchs.default_label == NULL) {
9963 warningf(&statement->base.source_position, "switch has no default case");
9965 if (warning.switch_enum)
9966 check_enum_cases(&statement->switchs);
9972 return create_invalid_statement();
9975 static statement_t *parse_loop_body(statement_t *const loop)
9977 statement_t *const rem = current_loop;
9978 current_loop = loop;
9980 statement_t *const body = parse_statement();
9987 * Parse a while statement.
9989 static statement_t *parse_while(void)
9991 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9995 PUSH_PARENT(statement);
9998 add_anchor_token(')');
9999 expression_t *const cond = parse_expression();
10000 statement->whiles.condition = cond;
10001 /* §6.8.5:2 The controlling expression of an iteration statement shall
10002 * have scalar type. */
10003 semantic_condition(cond, "condition of 'while'-statement");
10004 mark_vars_read(cond, NULL);
10005 rem_anchor_token(')');
10008 statement->whiles.body = parse_loop_body(statement);
10014 return create_invalid_statement();
10018 * Parse a do statement.
10020 static statement_t *parse_do(void)
10022 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10026 PUSH_PARENT(statement);
10028 add_anchor_token(T_while);
10029 statement->do_while.body = parse_loop_body(statement);
10030 rem_anchor_token(T_while);
10034 add_anchor_token(')');
10035 expression_t *const cond = parse_expression();
10036 statement->do_while.condition = cond;
10037 /* §6.8.5:2 The controlling expression of an iteration statement shall
10038 * have scalar type. */
10039 semantic_condition(cond, "condition of 'do-while'-statement");
10040 mark_vars_read(cond, NULL);
10041 rem_anchor_token(')');
10049 return create_invalid_statement();
10053 * Parse a for statement.
10055 static statement_t *parse_for(void)
10057 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10061 PUSH_PARENT(statement);
10063 size_t const top = environment_top();
10064 scope_t *old_scope = scope_push(&statement->fors.scope);
10067 add_anchor_token(')');
10069 if (token.type == ';') {
10071 } else if (is_declaration_specifier(&token, false)) {
10072 parse_declaration(record_entity, DECL_FLAGS_NONE);
10074 add_anchor_token(';');
10075 expression_t *const init = parse_expression();
10076 statement->fors.initialisation = init;
10077 mark_vars_read(init, ENT_ANY);
10078 if (warning.unused_value && !expression_has_effect(init)) {
10079 warningf(&init->base.source_position,
10080 "initialisation of 'for'-statement has no effect");
10082 rem_anchor_token(';');
10086 if (token.type != ';') {
10087 add_anchor_token(';');
10088 expression_t *const cond = parse_expression();
10089 statement->fors.condition = cond;
10090 /* §6.8.5:2 The controlling expression of an iteration statement
10091 * shall have scalar type. */
10092 semantic_condition(cond, "condition of 'for'-statement");
10093 mark_vars_read(cond, NULL);
10094 rem_anchor_token(';');
10097 if (token.type != ')') {
10098 expression_t *const step = parse_expression();
10099 statement->fors.step = step;
10100 mark_vars_read(step, ENT_ANY);
10101 if (warning.unused_value && !expression_has_effect(step)) {
10102 warningf(&step->base.source_position,
10103 "step of 'for'-statement has no effect");
10107 rem_anchor_token(')');
10108 statement->fors.body = parse_loop_body(statement);
10110 assert(current_scope == &statement->fors.scope);
10111 scope_pop(old_scope);
10112 environment_pop_to(top);
10119 rem_anchor_token(')');
10120 assert(current_scope == &statement->fors.scope);
10121 scope_pop(old_scope);
10122 environment_pop_to(top);
10124 return create_invalid_statement();
10128 * Parse a goto statement.
10130 static statement_t *parse_goto(void)
10132 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10135 if (GNU_MODE && token.type == '*') {
10137 expression_t *expression = parse_expression();
10138 mark_vars_read(expression, NULL);
10140 /* Argh: although documentation says the expression must be of type void*,
10141 * gcc accepts anything that can be casted into void* without error */
10142 type_t *type = expression->base.type;
10144 if (type != type_error_type) {
10145 if (!is_type_pointer(type) && !is_type_integer(type)) {
10146 errorf(&expression->base.source_position,
10147 "cannot convert to a pointer type");
10148 } else if (warning.other && type != type_void_ptr) {
10149 warningf(&expression->base.source_position,
10150 "type of computed goto expression should be 'void*' not '%T'", type);
10152 expression = create_implicit_cast(expression, type_void_ptr);
10155 statement->gotos.expression = expression;
10157 if (token.type != T_IDENTIFIER) {
10159 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10161 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10162 eat_until_anchor();
10165 symbol_t *symbol = token.v.symbol;
10168 statement->gotos.label = get_label(symbol);
10171 /* remember the goto's in a list for later checking */
10172 *goto_anchor = &statement->gotos;
10173 goto_anchor = &statement->gotos.next;
10179 return create_invalid_statement();
10183 * Parse a continue statement.
10185 static statement_t *parse_continue(void)
10187 if (current_loop == NULL) {
10188 errorf(HERE, "continue statement not within loop");
10191 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10201 * Parse a break statement.
10203 static statement_t *parse_break(void)
10205 if (current_switch == NULL && current_loop == NULL) {
10206 errorf(HERE, "break statement not within loop or switch");
10209 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10219 * Parse a __leave statement.
10221 static statement_t *parse_leave_statement(void)
10223 if (current_try == NULL) {
10224 errorf(HERE, "__leave statement not within __try");
10227 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10237 * Check if a given entity represents a local variable.
10239 static bool is_local_variable(const entity_t *entity)
10241 if (entity->kind != ENTITY_VARIABLE)
10244 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10245 case STORAGE_CLASS_AUTO:
10246 case STORAGE_CLASS_REGISTER: {
10247 const type_t *type = skip_typeref(entity->declaration.type);
10248 if (is_type_function(type)) {
10260 * Check if a given expression represents a local variable.
10262 static bool expression_is_local_variable(const expression_t *expression)
10264 if (expression->base.kind != EXPR_REFERENCE) {
10267 const entity_t *entity = expression->reference.entity;
10268 return is_local_variable(entity);
10272 * Check if a given expression represents a local variable and
10273 * return its declaration then, else return NULL.
10275 entity_t *expression_is_variable(const expression_t *expression)
10277 if (expression->base.kind != EXPR_REFERENCE) {
10280 entity_t *entity = expression->reference.entity;
10281 if (entity->kind != ENTITY_VARIABLE)
10288 * Parse a return statement.
10290 static statement_t *parse_return(void)
10294 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10296 expression_t *return_value = NULL;
10297 if (token.type != ';') {
10298 return_value = parse_expression();
10299 mark_vars_read(return_value, NULL);
10302 const type_t *const func_type = skip_typeref(current_function->base.type);
10303 assert(is_type_function(func_type));
10304 type_t *const return_type = skip_typeref(func_type->function.return_type);
10306 if (return_value != NULL) {
10307 type_t *return_value_type = skip_typeref(return_value->base.type);
10309 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) &&
10310 !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10311 if (warning.other) {
10312 warningf(&statement->base.source_position,
10313 "'return' with a value, in function returning void");
10315 return_value = NULL;
10317 assign_error_t error = semantic_assign(return_type, return_value);
10318 report_assign_error(error, return_type, return_value, "'return'",
10319 &statement->base.source_position);
10320 return_value = create_implicit_cast(return_value, return_type);
10322 /* check for returning address of a local var */
10323 if (warning.other && return_value != NULL
10324 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10325 const expression_t *expression = return_value->unary.value;
10326 if (expression_is_local_variable(expression)) {
10327 warningf(&statement->base.source_position,
10328 "function returns address of local variable");
10331 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10332 warningf(&statement->base.source_position,
10333 "'return' without value, in function returning non-void");
10335 statement->returns.value = return_value;
10344 * Parse a declaration statement.
10346 static statement_t *parse_declaration_statement(void)
10348 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10350 entity_t *before = current_scope->last_entity;
10352 parse_external_declaration();
10354 parse_declaration(record_entity, DECL_FLAGS_NONE);
10357 if (before == NULL) {
10358 statement->declaration.declarations_begin = current_scope->entities;
10360 statement->declaration.declarations_begin = before->base.next;
10362 statement->declaration.declarations_end = current_scope->last_entity;
10368 * Parse an expression statement, ie. expr ';'.
10370 static statement_t *parse_expression_statement(void)
10372 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10374 expression_t *const expr = parse_expression();
10375 statement->expression.expression = expr;
10376 mark_vars_read(expr, ENT_ANY);
10385 * Parse a microsoft __try { } __finally { } or
10386 * __try{ } __except() { }
10388 static statement_t *parse_ms_try_statment(void)
10390 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10393 PUSH_PARENT(statement);
10395 ms_try_statement_t *rem = current_try;
10396 current_try = &statement->ms_try;
10397 statement->ms_try.try_statement = parse_compound_statement(false);
10402 if (token.type == T___except) {
10405 add_anchor_token(')');
10406 expression_t *const expr = parse_expression();
10407 mark_vars_read(expr, NULL);
10408 type_t * type = skip_typeref(expr->base.type);
10409 if (is_type_integer(type)) {
10410 type = promote_integer(type);
10411 } else if (is_type_valid(type)) {
10412 errorf(&expr->base.source_position,
10413 "__expect expression is not an integer, but '%T'", type);
10414 type = type_error_type;
10416 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10417 rem_anchor_token(')');
10419 statement->ms_try.final_statement = parse_compound_statement(false);
10420 } else if (token.type == T__finally) {
10422 statement->ms_try.final_statement = parse_compound_statement(false);
10424 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10425 return create_invalid_statement();
10429 return create_invalid_statement();
10432 static statement_t *parse_empty_statement(void)
10434 if (warning.empty_statement) {
10435 warningf(HERE, "statement is empty");
10437 statement_t *const statement = create_empty_statement();
10442 static statement_t *parse_local_label_declaration(void)
10444 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10448 entity_t *begin = NULL, *end = NULL;
10451 if (token.type != T_IDENTIFIER) {
10452 parse_error_expected("while parsing local label declaration",
10453 T_IDENTIFIER, NULL);
10456 symbol_t *symbol = token.v.symbol;
10457 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10458 if (entity != NULL && entity->base.parent_scope == current_scope) {
10459 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10460 symbol, &entity->base.source_position);
10462 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10464 entity->base.parent_scope = current_scope;
10465 entity->base.namespc = NAMESPACE_LABEL;
10466 entity->base.source_position = token.source_position;
10467 entity->base.symbol = symbol;
10470 end->base.next = entity;
10475 environment_push(entity);
10479 if (token.type != ',')
10485 statement->declaration.declarations_begin = begin;
10486 statement->declaration.declarations_end = end;
10490 static void parse_namespace_definition(void)
10494 entity_t *entity = NULL;
10495 symbol_t *symbol = NULL;
10497 if (token.type == T_IDENTIFIER) {
10498 symbol = token.v.symbol;
10501 entity = get_entity(symbol, NAMESPACE_NORMAL);
10502 if (entity != NULL && entity->kind != ENTITY_NAMESPACE
10503 && entity->base.parent_scope == current_scope) {
10504 error_redefined_as_different_kind(&token.source_position,
10505 entity, ENTITY_NAMESPACE);
10510 if (entity == NULL) {
10511 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10512 entity->base.symbol = symbol;
10513 entity->base.source_position = token.source_position;
10514 entity->base.namespc = NAMESPACE_NORMAL;
10515 entity->base.parent_scope = current_scope;
10518 if (token.type == '=') {
10519 /* TODO: parse namespace alias */
10520 panic("namespace alias definition not supported yet");
10523 environment_push(entity);
10524 append_entity(current_scope, entity);
10526 size_t const top = environment_top();
10527 scope_t *old_scope = scope_push(&entity->namespacee.members);
10534 assert(current_scope == &entity->namespacee.members);
10535 scope_pop(old_scope);
10536 environment_pop_to(top);
10540 * Parse a statement.
10541 * There's also parse_statement() which additionally checks for
10542 * "statement has no effect" warnings
10544 static statement_t *intern_parse_statement(void)
10546 statement_t *statement = NULL;
10548 /* declaration or statement */
10549 add_anchor_token(';');
10550 switch (token.type) {
10551 case T_IDENTIFIER: {
10552 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10553 if (la1_type == ':') {
10554 statement = parse_label_statement();
10555 } else if (is_typedef_symbol(token.v.symbol)) {
10556 statement = parse_declaration_statement();
10558 /* it's an identifier, the grammar says this must be an
10559 * expression statement. However it is common that users mistype
10560 * declaration types, so we guess a bit here to improve robustness
10561 * for incorrect programs */
10562 switch (la1_type) {
10565 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10566 goto expression_statment;
10571 statement = parse_declaration_statement();
10575 expression_statment:
10576 statement = parse_expression_statement();
10583 case T___extension__:
10584 /* This can be a prefix to a declaration or an expression statement.
10585 * We simply eat it now and parse the rest with tail recursion. */
10588 } while (token.type == T___extension__);
10589 bool old_gcc_extension = in_gcc_extension;
10590 in_gcc_extension = true;
10591 statement = intern_parse_statement();
10592 in_gcc_extension = old_gcc_extension;
10596 statement = parse_declaration_statement();
10600 statement = parse_local_label_declaration();
10603 case ';': statement = parse_empty_statement(); break;
10604 case '{': statement = parse_compound_statement(false); break;
10605 case T___leave: statement = parse_leave_statement(); break;
10606 case T___try: statement = parse_ms_try_statment(); break;
10607 case T_asm: statement = parse_asm_statement(); break;
10608 case T_break: statement = parse_break(); break;
10609 case T_case: statement = parse_case_statement(); break;
10610 case T_continue: statement = parse_continue(); break;
10611 case T_default: statement = parse_default_statement(); break;
10612 case T_do: statement = parse_do(); break;
10613 case T_for: statement = parse_for(); break;
10614 case T_goto: statement = parse_goto(); break;
10615 case T_if: statement = parse_if(); break;
10616 case T_return: statement = parse_return(); break;
10617 case T_switch: statement = parse_switch(); break;
10618 case T_while: statement = parse_while(); break;
10621 statement = parse_expression_statement();
10625 errorf(HERE, "unexpected token '%K' while parsing statement", &token);
10626 statement = create_invalid_statement();
10631 rem_anchor_token(';');
10633 assert(statement != NULL
10634 && statement->base.source_position.input_name != NULL);
10640 * parse a statement and emits "statement has no effect" warning if needed
10641 * (This is really a wrapper around intern_parse_statement with check for 1
10642 * single warning. It is needed, because for statement expressions we have
10643 * to avoid the warning on the last statement)
10645 static statement_t *parse_statement(void)
10647 statement_t *statement = intern_parse_statement();
10649 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10650 expression_t *expression = statement->expression.expression;
10651 if (!expression_has_effect(expression)) {
10652 warningf(&expression->base.source_position,
10653 "statement has no effect");
10661 * Parse a compound statement.
10663 static statement_t *parse_compound_statement(bool inside_expression_statement)
10665 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10667 PUSH_PARENT(statement);
10670 add_anchor_token('}');
10672 size_t const top = environment_top();
10673 scope_t *old_scope = scope_push(&statement->compound.scope);
10675 statement_t **anchor = &statement->compound.statements;
10676 bool only_decls_so_far = true;
10677 while (token.type != '}') {
10678 if (token.type == T_EOF) {
10679 errorf(&statement->base.source_position,
10680 "EOF while parsing compound statement");
10683 statement_t *sub_statement = intern_parse_statement();
10684 if (is_invalid_statement(sub_statement)) {
10685 /* an error occurred. if we are at an anchor, return */
10691 if (warning.declaration_after_statement) {
10692 if (sub_statement->kind != STATEMENT_DECLARATION) {
10693 only_decls_so_far = false;
10694 } else if (!only_decls_so_far) {
10695 warningf(&sub_statement->base.source_position,
10696 "ISO C90 forbids mixed declarations and code");
10700 *anchor = sub_statement;
10702 while (sub_statement->base.next != NULL)
10703 sub_statement = sub_statement->base.next;
10705 anchor = &sub_statement->base.next;
10709 /* look over all statements again to produce no effect warnings */
10710 if (warning.unused_value) {
10711 statement_t *sub_statement = statement->compound.statements;
10712 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10713 if (sub_statement->kind != STATEMENT_EXPRESSION)
10715 /* don't emit a warning for the last expression in an expression
10716 * statement as it has always an effect */
10717 if (inside_expression_statement && sub_statement->base.next == NULL)
10720 expression_t *expression = sub_statement->expression.expression;
10721 if (!expression_has_effect(expression)) {
10722 warningf(&expression->base.source_position,
10723 "statement has no effect");
10729 rem_anchor_token('}');
10730 assert(current_scope == &statement->compound.scope);
10731 scope_pop(old_scope);
10732 environment_pop_to(top);
10739 * Check for unused global static functions and variables
10741 static void check_unused_globals(void)
10743 if (!warning.unused_function && !warning.unused_variable)
10746 for (const entity_t *entity = file_scope->entities; entity != NULL;
10747 entity = entity->base.next) {
10748 if (!is_declaration(entity))
10751 const declaration_t *declaration = &entity->declaration;
10752 if (declaration->used ||
10753 declaration->modifiers & DM_UNUSED ||
10754 declaration->modifiers & DM_USED ||
10755 declaration->storage_class != STORAGE_CLASS_STATIC)
10758 type_t *const type = declaration->type;
10760 if (entity->kind == ENTITY_FUNCTION) {
10761 /* inhibit warning for static inline functions */
10762 if (entity->function.is_inline)
10765 s = entity->function.statement != NULL ? "defined" : "declared";
10770 warningf(&declaration->base.source_position, "'%#T' %s but not used",
10771 type, declaration->base.symbol, s);
10775 static void parse_global_asm(void)
10777 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10782 statement->asms.asm_text = parse_string_literals();
10783 statement->base.next = unit->global_asm;
10784 unit->global_asm = statement;
10792 static void parse_linkage_specification(void)
10795 assert(token.type == T_STRING_LITERAL);
10797 const char *linkage = parse_string_literals().begin;
10799 linkage_kind_t old_linkage = current_linkage;
10800 linkage_kind_t new_linkage;
10801 if (strcmp(linkage, "C") == 0) {
10802 new_linkage = LINKAGE_C;
10803 } else if (strcmp(linkage, "C++") == 0) {
10804 new_linkage = LINKAGE_CXX;
10806 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
10807 new_linkage = LINKAGE_INVALID;
10809 current_linkage = new_linkage;
10811 if (token.type == '{') {
10820 assert(current_linkage == new_linkage);
10821 current_linkage = old_linkage;
10824 static void parse_external(void)
10826 switch (token.type) {
10827 DECLARATION_START_NO_EXTERN
10829 case T___extension__:
10830 /* tokens below are for implicit int */
10831 case '&': /* & x; -> int& x; (and error later, because C++ has no
10833 case '*': /* * x; -> int* x; */
10834 case '(': /* (x); -> int (x); */
10835 parse_external_declaration();
10839 if (look_ahead(1)->type == T_STRING_LITERAL) {
10840 parse_linkage_specification();
10842 parse_external_declaration();
10847 parse_global_asm();
10851 parse_namespace_definition();
10855 if (!strict_mode) {
10857 warningf(HERE, "stray ';' outside of function");
10864 errorf(HERE, "stray '%K' outside of function", &token);
10865 if (token.type == '(' || token.type == '{' || token.type == '[')
10866 eat_until_matching_token(token.type);
10872 static void parse_externals(void)
10874 add_anchor_token('}');
10875 add_anchor_token(T_EOF);
10878 unsigned char token_anchor_copy[T_LAST_TOKEN];
10879 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10882 while (token.type != T_EOF && token.type != '}') {
10884 bool anchor_leak = false;
10885 for (int i = 0; i != T_LAST_TOKEN; ++i) {
10886 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10888 errorf(HERE, "Leaked anchor token %k %d times", i, count);
10889 anchor_leak = true;
10892 if (in_gcc_extension) {
10893 errorf(HERE, "Leaked __extension__");
10894 anchor_leak = true;
10904 rem_anchor_token(T_EOF);
10905 rem_anchor_token('}');
10909 * Parse a translation unit.
10911 static void parse_translation_unit(void)
10913 add_anchor_token(T_EOF);
10918 if (token.type == T_EOF)
10921 errorf(HERE, "stray '%K' outside of function", &token);
10922 if (token.type == '(' || token.type == '{' || token.type == '[')
10923 eat_until_matching_token(token.type);
10931 * @return the translation unit or NULL if errors occurred.
10933 void start_parsing(void)
10935 environment_stack = NEW_ARR_F(stack_entry_t, 0);
10936 label_stack = NEW_ARR_F(stack_entry_t, 0);
10937 diagnostic_count = 0;
10941 type_set_output(stderr);
10942 ast_set_output(stderr);
10944 assert(unit == NULL);
10945 unit = allocate_ast_zero(sizeof(unit[0]));
10947 assert(file_scope == NULL);
10948 file_scope = &unit->scope;
10950 assert(current_scope == NULL);
10951 scope_push(&unit->scope);
10954 translation_unit_t *finish_parsing(void)
10956 assert(current_scope == &unit->scope);
10959 assert(file_scope == &unit->scope);
10960 check_unused_globals();
10963 DEL_ARR_F(environment_stack);
10964 DEL_ARR_F(label_stack);
10966 translation_unit_t *result = unit;
10973 lookahead_bufpos = 0;
10974 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10977 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
10978 parse_translation_unit();
10982 * Initialize the parser.
10984 void init_parser(void)
10986 sym_anonymous = symbol_table_insert("<anonymous>");
10988 if (c_mode & _MS) {
10989 /* add predefined symbols for extended-decl-modifier */
10990 sym_align = symbol_table_insert("align");
10991 sym_allocate = symbol_table_insert("allocate");
10992 sym_dllimport = symbol_table_insert("dllimport");
10993 sym_dllexport = symbol_table_insert("dllexport");
10994 sym_naked = symbol_table_insert("naked");
10995 sym_noinline = symbol_table_insert("noinline");
10996 sym_noreturn = symbol_table_insert("noreturn");
10997 sym_nothrow = symbol_table_insert("nothrow");
10998 sym_novtable = symbol_table_insert("novtable");
10999 sym_property = symbol_table_insert("property");
11000 sym_get = symbol_table_insert("get");
11001 sym_put = symbol_table_insert("put");
11002 sym_selectany = symbol_table_insert("selectany");
11003 sym_thread = symbol_table_insert("thread");
11004 sym_uuid = symbol_table_insert("uuid");
11005 sym_deprecated = symbol_table_insert("deprecated");
11006 sym_restrict = symbol_table_insert("restrict");
11007 sym_noalias = symbol_table_insert("noalias");
11009 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11011 init_expression_parsers();
11012 obstack_init(&temp_obst);
11014 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11015 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11019 * Terminate the parser.
11021 void exit_parser(void)
11023 obstack_free(&temp_obst, NULL);