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 1
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 has_arguments; /**< True, if this attribute has arguments. */
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 size_t lookahead_bufpos;
117 static stack_entry_t *environment_stack = NULL;
118 static stack_entry_t *label_stack = NULL;
119 static scope_t *file_scope = NULL;
120 static scope_t *current_scope = NULL;
121 /** Point to the current function declaration if inside a function. */
122 static function_t *current_function = NULL;
123 static entity_t *current_init_decl = NULL;
124 static switch_statement_t *current_switch = NULL;
125 static statement_t *current_loop = NULL;
126 static statement_t *current_parent = NULL;
127 static ms_try_statement_t *current_try = NULL;
128 static linkage_kind_t current_linkage = LINKAGE_INVALID;
129 static goto_statement_t *goto_first = NULL;
130 static goto_statement_t **goto_anchor = NULL;
131 static label_statement_t *label_first = NULL;
132 static label_statement_t **label_anchor = NULL;
133 /** current translation unit. */
134 static translation_unit_t *unit = NULL;
135 /** true if we are in a type property context (evaluation only for type. */
136 static bool in_type_prop = false;
137 /** true in we are in a __extension__ context. */
138 static bool in_gcc_extension = false;
139 static struct obstack temp_obst;
140 static entity_t *anonymous_entity;
141 static declaration_t **incomplete_arrays;
144 #define PUSH_PARENT(stmt) \
145 statement_t *const prev_parent = current_parent; \
146 ((void)(current_parent = (stmt)))
147 #define POP_PARENT ((void)(current_parent = prev_parent))
149 /** special symbol used for anonymous entities. */
150 static const symbol_t *sym_anonymous = NULL;
152 /* symbols for Microsoft extended-decl-modifier */
153 static const symbol_t *sym_align = NULL;
154 static const symbol_t *sym_allocate = NULL;
155 static const symbol_t *sym_dllimport = NULL;
156 static const symbol_t *sym_dllexport = NULL;
157 static const symbol_t *sym_naked = NULL;
158 static const symbol_t *sym_noinline = NULL;
159 static const symbol_t *sym_returns_twice = NULL;
160 static const symbol_t *sym_noreturn = NULL;
161 static const symbol_t *sym_nothrow = NULL;
162 static const symbol_t *sym_novtable = NULL;
163 static const symbol_t *sym_property = NULL;
164 static const symbol_t *sym_get = NULL;
165 static const symbol_t *sym_put = NULL;
166 static const symbol_t *sym_selectany = NULL;
167 static const symbol_t *sym_thread = NULL;
168 static const symbol_t *sym_uuid = NULL;
169 static const symbol_t *sym_deprecated = NULL;
170 static const symbol_t *sym_restrict = NULL;
171 static const symbol_t *sym_noalias = NULL;
173 /** The token anchor set */
174 static unsigned char token_anchor_set[T_LAST_TOKEN];
176 /** The current source position. */
177 #define HERE (&token.source_position)
179 /** true if we are in GCC mode. */
180 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
182 static type_t *type_valist;
184 static statement_t *parse_compound_statement(bool inside_expression_statement);
185 static statement_t *parse_statement(void);
187 static expression_t *parse_sub_expression(precedence_t);
188 static expression_t *parse_expression(void);
189 static type_t *parse_typename(void);
190 static void parse_externals(void);
191 static void parse_external(void);
193 static void parse_compound_type_entries(compound_t *compound_declaration);
195 typedef enum declarator_flags_t {
197 DECL_MAY_BE_ABSTRACT = 1U << 0,
198 DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
199 DECL_IS_PARAMETER = 1U << 2
200 } declarator_flags_t;
202 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
203 declarator_flags_t flags);
205 static entity_t *record_entity(entity_t *entity, bool is_definition);
207 static void semantic_comparison(binary_expression_t *expression);
209 #define STORAGE_CLASSES \
210 STORAGE_CLASSES_NO_EXTERN \
213 #define STORAGE_CLASSES_NO_EXTERN \
220 #define TYPE_QUALIFIERS \
225 case T__forceinline: \
226 case T___attribute__:
228 #define COMPLEX_SPECIFIERS \
230 #define IMAGINARY_SPECIFIERS \
233 #define TYPE_SPECIFIERS \
235 case T___builtin_va_list: \
255 #define DECLARATION_START \
260 #define DECLARATION_START_NO_EXTERN \
261 STORAGE_CLASSES_NO_EXTERN \
265 #define TYPENAME_START \
269 #define EXPRESSION_START \
278 case T_CHARACTER_CONSTANT: \
279 case T_FLOATINGPOINT: \
283 case T_STRING_LITERAL: \
284 case T_WIDE_CHARACTER_CONSTANT: \
285 case T_WIDE_STRING_LITERAL: \
286 case T___FUNCDNAME__: \
287 case T___FUNCSIG__: \
288 case T___FUNCTION__: \
289 case T___PRETTY_FUNCTION__: \
290 case T___alignof__: \
291 case T___builtin_alloca: \
292 case T___builtin_classify_type: \
293 case T___builtin_constant_p: \
294 case T___builtin_expect: \
295 case T___builtin_huge_val: \
296 case T___builtin_inf: \
297 case T___builtin_inff: \
298 case T___builtin_infl: \
299 case T___builtin_isgreater: \
300 case T___builtin_isgreaterequal: \
301 case T___builtin_isless: \
302 case T___builtin_islessequal: \
303 case T___builtin_islessgreater: \
304 case T___builtin_isunordered: \
305 case T___builtin_nan: \
306 case T___builtin_nanf: \
307 case T___builtin_nanl: \
308 case T___builtin_offsetof: \
309 case T___builtin_prefetch: \
310 case T___builtin_va_arg: \
311 case T___builtin_va_end: \
312 case T___builtin_va_start: \
323 * Allocate an AST node with given size and
324 * initialize all fields with zero.
326 static void *allocate_ast_zero(size_t size)
328 void *res = allocate_ast(size);
329 memset(res, 0, size);
334 * Returns the size of an entity node.
336 * @param kind the entity kind
338 static size_t get_entity_struct_size(entity_kind_t kind)
340 static const size_t sizes[] = {
341 [ENTITY_VARIABLE] = sizeof(variable_t),
342 [ENTITY_PARAMETER] = sizeof(parameter_t),
343 [ENTITY_COMPOUND_MEMBER] = sizeof(compound_member_t),
344 [ENTITY_FUNCTION] = sizeof(function_t),
345 [ENTITY_TYPEDEF] = sizeof(typedef_t),
346 [ENTITY_STRUCT] = sizeof(compound_t),
347 [ENTITY_UNION] = sizeof(compound_t),
348 [ENTITY_ENUM] = sizeof(enum_t),
349 [ENTITY_ENUM_VALUE] = sizeof(enum_value_t),
350 [ENTITY_LABEL] = sizeof(label_t),
351 [ENTITY_LOCAL_LABEL] = sizeof(label_t),
352 [ENTITY_NAMESPACE] = sizeof(namespace_t)
354 assert(kind < lengthof(sizes));
355 assert(sizes[kind] != 0);
360 * Allocate an entity of given kind and initialize all
363 static entity_t *allocate_entity_zero(entity_kind_t kind)
365 size_t size = get_entity_struct_size(kind);
366 entity_t *entity = allocate_ast_zero(size);
372 * Returns the size of a statement node.
374 * @param kind the statement kind
376 static size_t get_statement_struct_size(statement_kind_t kind)
378 static const size_t sizes[] = {
379 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
380 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
381 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
382 [STATEMENT_RETURN] = sizeof(return_statement_t),
383 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
384 [STATEMENT_IF] = sizeof(if_statement_t),
385 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
386 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
387 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
388 [STATEMENT_BREAK] = sizeof(statement_base_t),
389 [STATEMENT_GOTO] = sizeof(goto_statement_t),
390 [STATEMENT_LABEL] = sizeof(label_statement_t),
391 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
392 [STATEMENT_WHILE] = sizeof(while_statement_t),
393 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
394 [STATEMENT_FOR] = sizeof(for_statement_t),
395 [STATEMENT_ASM] = sizeof(asm_statement_t),
396 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
397 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
399 assert(kind < lengthof(sizes));
400 assert(sizes[kind] != 0);
405 * Returns the size of an expression node.
407 * @param kind the expression kind
409 static size_t get_expression_struct_size(expression_kind_t kind)
411 static const size_t sizes[] = {
412 [EXPR_INVALID] = sizeof(expression_base_t),
413 [EXPR_REFERENCE] = sizeof(reference_expression_t),
414 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
415 [EXPR_CONST] = sizeof(const_expression_t),
416 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
417 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
418 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
419 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
420 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
421 [EXPR_CALL] = sizeof(call_expression_t),
422 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
423 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
424 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
425 [EXPR_SELECT] = sizeof(select_expression_t),
426 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
427 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
428 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
429 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
430 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
431 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
432 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
433 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
434 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
435 [EXPR_VA_START] = sizeof(va_start_expression_t),
436 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
437 [EXPR_STATEMENT] = sizeof(statement_expression_t),
438 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
440 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
441 return sizes[EXPR_UNARY_FIRST];
443 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
444 return sizes[EXPR_BINARY_FIRST];
446 assert(kind < lengthof(sizes));
447 assert(sizes[kind] != 0);
452 * Allocate a statement node of given kind and initialize all
453 * fields with zero. Sets its source position to the position
454 * of the current token.
456 static statement_t *allocate_statement_zero(statement_kind_t kind)
458 size_t size = get_statement_struct_size(kind);
459 statement_t *res = allocate_ast_zero(size);
461 res->base.kind = kind;
462 res->base.parent = current_parent;
463 res->base.source_position = token.source_position;
468 * Allocate an expression node of given kind and initialize all
471 static expression_t *allocate_expression_zero(expression_kind_t kind)
473 size_t size = get_expression_struct_size(kind);
474 expression_t *res = allocate_ast_zero(size);
476 res->base.kind = kind;
477 res->base.type = type_error_type;
478 res->base.source_position = token.source_position;
483 * Creates a new invalid expression at the source position
484 * of the current token.
486 static expression_t *create_invalid_expression(void)
488 return allocate_expression_zero(EXPR_INVALID);
492 * Creates a new invalid statement.
494 static statement_t *create_invalid_statement(void)
496 return allocate_statement_zero(STATEMENT_INVALID);
500 * Allocate a new empty statement.
502 static statement_t *create_empty_statement(void)
504 return allocate_statement_zero(STATEMENT_EMPTY);
508 * Returns the size of a type node.
510 * @param kind the type kind
512 static size_t get_type_struct_size(type_kind_t kind)
514 static const size_t sizes[] = {
515 [TYPE_ATOMIC] = sizeof(atomic_type_t),
516 [TYPE_COMPLEX] = sizeof(complex_type_t),
517 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
518 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
519 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
520 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
521 [TYPE_ENUM] = sizeof(enum_type_t),
522 [TYPE_FUNCTION] = sizeof(function_type_t),
523 [TYPE_POINTER] = sizeof(pointer_type_t),
524 [TYPE_ARRAY] = sizeof(array_type_t),
525 [TYPE_BUILTIN] = sizeof(builtin_type_t),
526 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
527 [TYPE_TYPEOF] = sizeof(typeof_type_t),
529 assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
530 assert(kind <= TYPE_TYPEOF);
531 assert(sizes[kind] != 0);
536 * Allocate a type node of given kind and initialize all
539 * @param kind type kind to allocate
541 static type_t *allocate_type_zero(type_kind_t kind)
543 size_t size = get_type_struct_size(kind);
544 type_t *res = obstack_alloc(type_obst, size);
545 memset(res, 0, size);
546 res->base.kind = kind;
552 * Returns the size of an initializer node.
554 * @param kind the initializer kind
556 static size_t get_initializer_size(initializer_kind_t kind)
558 static const size_t sizes[] = {
559 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
560 [INITIALIZER_STRING] = sizeof(initializer_string_t),
561 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
562 [INITIALIZER_LIST] = sizeof(initializer_list_t),
563 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
565 assert(kind < lengthof(sizes));
566 assert(sizes[kind] != 0);
571 * Allocate an initializer node of given kind and initialize all
574 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
576 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
583 * Returns the index of the top element of the environment stack.
585 static size_t environment_top(void)
587 return ARR_LEN(environment_stack);
591 * Returns the index of the top element of the global label stack.
593 static size_t label_top(void)
595 return ARR_LEN(label_stack);
599 * Return the next token.
601 static inline void next_token(void)
603 token = lookahead_buffer[lookahead_bufpos];
604 lookahead_buffer[lookahead_bufpos] = lexer_token;
607 lookahead_bufpos = (lookahead_bufpos + 1) % MAX_LOOKAHEAD;
610 print_token(stderr, &token);
611 fprintf(stderr, "\n");
616 * Return the next token with a given lookahead.
618 static inline const token_t *look_ahead(size_t num)
620 assert(0 < num && num <= MAX_LOOKAHEAD);
621 size_t pos = (lookahead_bufpos + num - 1) % MAX_LOOKAHEAD;
622 return &lookahead_buffer[pos];
626 * Adds a token type to the token type anchor set (a multi-set).
628 static void add_anchor_token(int token_type)
630 assert(0 <= token_type && token_type < T_LAST_TOKEN);
631 ++token_anchor_set[token_type];
635 * Set the number of tokens types of the given type
636 * to zero and return the old count.
638 static int save_and_reset_anchor_state(int token_type)
640 assert(0 <= token_type && token_type < T_LAST_TOKEN);
641 int count = token_anchor_set[token_type];
642 token_anchor_set[token_type] = 0;
647 * Restore the number of token types to the given count.
649 static void restore_anchor_state(int token_type, int count)
651 assert(0 <= token_type && token_type < T_LAST_TOKEN);
652 token_anchor_set[token_type] = count;
656 * Remove a token type from the token type anchor set (a multi-set).
658 static void rem_anchor_token(int token_type)
660 assert(0 <= token_type && token_type < T_LAST_TOKEN);
661 assert(token_anchor_set[token_type] != 0);
662 --token_anchor_set[token_type];
666 * Return true if the token type of the current token is
669 static bool at_anchor(void)
673 return token_anchor_set[token.type];
677 * Eat tokens until a matching token type is found.
679 static void eat_until_matching_token(int type)
683 case '(': end_token = ')'; break;
684 case '{': end_token = '}'; break;
685 case '[': end_token = ']'; break;
686 default: end_token = type; break;
689 unsigned parenthesis_count = 0;
690 unsigned brace_count = 0;
691 unsigned bracket_count = 0;
692 while (token.type != end_token ||
693 parenthesis_count != 0 ||
695 bracket_count != 0) {
696 switch (token.type) {
698 case '(': ++parenthesis_count; break;
699 case '{': ++brace_count; break;
700 case '[': ++bracket_count; break;
703 if (parenthesis_count > 0)
713 if (bracket_count > 0)
716 if (token.type == end_token &&
717 parenthesis_count == 0 &&
731 * Eat input tokens until an anchor is found.
733 static void eat_until_anchor(void)
735 while (token_anchor_set[token.type] == 0) {
736 if (token.type == '(' || token.type == '{' || token.type == '[')
737 eat_until_matching_token(token.type);
743 * Eat a whole block from input tokens.
745 static void eat_block(void)
747 eat_until_matching_token('{');
748 if (token.type == '}')
752 #define eat(token_type) (assert(token.type == (token_type)), next_token())
755 * Report a parse error because an expected token was not found.
758 #if defined __GNUC__ && __GNUC__ >= 4
759 __attribute__((sentinel))
761 void parse_error_expected(const char *message, ...)
763 if (message != NULL) {
764 errorf(HERE, "%s", message);
767 va_start(ap, message);
768 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
773 * Report an incompatible type.
775 static void type_error_incompatible(const char *msg,
776 const source_position_t *source_position, type_t *type1, type_t *type2)
778 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
783 * Expect the current token is the expected token.
784 * If not, generate an error, eat the current statement,
785 * and goto the end_error label.
787 #define expect(expected, error_label) \
789 if (UNLIKELY(token.type != (expected))) { \
790 parse_error_expected(NULL, (expected), NULL); \
791 add_anchor_token(expected); \
792 eat_until_anchor(); \
793 if (token.type == expected) \
795 rem_anchor_token(expected); \
802 * Push a given scope on the scope stack and make it the
805 static scope_t *scope_push(scope_t *new_scope)
807 if (current_scope != NULL) {
808 new_scope->depth = current_scope->depth + 1;
811 scope_t *old_scope = current_scope;
812 current_scope = new_scope;
817 * Pop the current scope from the scope stack.
819 static void scope_pop(scope_t *old_scope)
821 current_scope = old_scope;
825 * Search an entity by its symbol in a given namespace.
827 static entity_t *get_entity(const symbol_t *const symbol,
828 namespace_tag_t namespc)
830 entity_t *entity = symbol->entity;
831 for (; entity != NULL; entity = entity->base.symbol_next) {
832 if (entity->base.namespc == namespc)
840 * pushs an entity on the environment stack and links the corresponding symbol
843 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
845 symbol_t *symbol = entity->base.symbol;
846 entity_namespace_t namespc = entity->base.namespc;
847 assert(namespc != NAMESPACE_INVALID);
849 /* replace/add entity into entity list of the symbol */
852 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
857 /* replace an entry? */
858 if (iter->base.namespc == namespc) {
859 entity->base.symbol_next = iter->base.symbol_next;
865 /* remember old declaration */
867 entry.symbol = symbol;
868 entry.old_entity = iter;
869 entry.namespc = namespc;
870 ARR_APP1(stack_entry_t, *stack_ptr, entry);
874 * Push an entity on the environment stack.
876 static void environment_push(entity_t *entity)
878 assert(entity->base.source_position.input_name != NULL);
879 assert(entity->base.parent_scope != NULL);
880 stack_push(&environment_stack, entity);
884 * Push a declaration on the global label stack.
886 * @param declaration the declaration
888 static void label_push(entity_t *label)
890 /* we abuse the parameters scope as parent for the labels */
891 label->base.parent_scope = ¤t_function->parameters;
892 stack_push(&label_stack, label);
896 * pops symbols from the environment stack until @p new_top is the top element
898 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
900 stack_entry_t *stack = *stack_ptr;
901 size_t top = ARR_LEN(stack);
904 assert(new_top <= top);
908 for (i = top; i > new_top; --i) {
909 stack_entry_t *entry = &stack[i - 1];
911 entity_t *old_entity = entry->old_entity;
912 symbol_t *symbol = entry->symbol;
913 entity_namespace_t namespc = entry->namespc;
915 /* replace with old_entity/remove */
918 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
920 assert(iter != NULL);
921 /* replace an entry? */
922 if (iter->base.namespc == namespc)
926 /* restore definition from outer scopes (if there was one) */
927 if (old_entity != NULL) {
928 old_entity->base.symbol_next = iter->base.symbol_next;
929 *anchor = old_entity;
931 /* remove entry from list */
932 *anchor = iter->base.symbol_next;
936 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
940 * Pop all entries from the environment stack until the new_top
943 * @param new_top the new stack top
945 static void environment_pop_to(size_t new_top)
947 stack_pop_to(&environment_stack, new_top);
951 * Pop all entries from the global label stack until the new_top
954 * @param new_top the new stack top
956 static void label_pop_to(size_t new_top)
958 stack_pop_to(&label_stack, new_top);
961 static int get_akind_rank(atomic_type_kind_t akind)
967 * Return the type rank for an atomic type.
969 static int get_rank(const type_t *type)
971 assert(!is_typeref(type));
972 if (type->kind == TYPE_ENUM)
973 return get_akind_rank(type->enumt.akind);
975 assert(type->kind == TYPE_ATOMIC);
976 return get_akind_rank(type->atomic.akind);
980 * Do integer promotion for a given type.
982 * @param type the type to promote
983 * @return the promoted type
985 static type_t *promote_integer(type_t *type)
987 if (type->kind == TYPE_BITFIELD)
988 type = type->bitfield.base_type;
990 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
997 * Create a cast expression.
999 * @param expression the expression to cast
1000 * @param dest_type the destination type
1002 static expression_t *create_cast_expression(expression_t *expression,
1005 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
1007 cast->unary.value = expression;
1008 cast->base.type = dest_type;
1014 * Check if a given expression represents a null pointer constant.
1016 * @param expression the expression to check
1018 static bool is_null_pointer_constant(const expression_t *expression)
1020 /* skip void* cast */
1021 if (expression->kind == EXPR_UNARY_CAST ||
1022 expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
1023 type_t *const type = skip_typeref(expression->base.type);
1024 if (types_compatible(type, type_void_ptr))
1025 expression = expression->unary.value;
1028 type_t *const type = skip_typeref(expression->base.type);
1030 is_type_integer(type) &&
1031 is_constant_expression(expression) &&
1032 fold_constant(expression) == 0;
1036 * Create an implicit cast expression.
1038 * @param expression the expression to cast
1039 * @param dest_type the destination type
1041 static expression_t *create_implicit_cast(expression_t *expression,
1044 type_t *const source_type = expression->base.type;
1046 if (source_type == dest_type)
1049 return create_cast_expression(expression, dest_type);
1052 typedef enum assign_error_t {
1054 ASSIGN_ERROR_INCOMPATIBLE,
1055 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1056 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1057 ASSIGN_WARNING_POINTER_FROM_INT,
1058 ASSIGN_WARNING_INT_FROM_POINTER
1061 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1062 const expression_t *const right,
1063 const char *context,
1064 const source_position_t *source_position)
1066 type_t *const orig_type_right = right->base.type;
1067 type_t *const type_left = skip_typeref(orig_type_left);
1068 type_t *const type_right = skip_typeref(orig_type_right);
1071 case ASSIGN_SUCCESS:
1073 case ASSIGN_ERROR_INCOMPATIBLE:
1074 errorf(source_position,
1075 "destination type '%T' in %s is incompatible with type '%T'",
1076 orig_type_left, context, orig_type_right);
1079 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1080 if (warning.other) {
1081 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
1082 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1084 /* the left type has all qualifiers from the right type */
1085 unsigned missing_qualifiers
1086 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1087 warningf(source_position,
1088 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1089 orig_type_left, context, orig_type_right, missing_qualifiers);
1094 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1095 if (warning.other) {
1096 warningf(source_position,
1097 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1098 orig_type_left, context, right, orig_type_right);
1102 case ASSIGN_WARNING_POINTER_FROM_INT:
1103 if (warning.other) {
1104 warningf(source_position,
1105 "%s makes pointer '%T' from integer '%T' without a cast",
1106 context, orig_type_left, orig_type_right);
1110 case ASSIGN_WARNING_INT_FROM_POINTER:
1111 if (warning.other) {
1112 warningf(source_position,
1113 "%s makes integer '%T' from pointer '%T' without a cast",
1114 context, orig_type_left, orig_type_right);
1119 panic("invalid error value");
1123 /** Implements the rules from § 6.5.16.1 */
1124 static assign_error_t semantic_assign(type_t *orig_type_left,
1125 const expression_t *const right)
1127 type_t *const orig_type_right = right->base.type;
1128 type_t *const type_left = skip_typeref(orig_type_left);
1129 type_t *const type_right = skip_typeref(orig_type_right);
1131 if (is_type_pointer(type_left)) {
1132 if (is_null_pointer_constant(right)) {
1133 return ASSIGN_SUCCESS;
1134 } else if (is_type_pointer(type_right)) {
1135 type_t *points_to_left
1136 = skip_typeref(type_left->pointer.points_to);
1137 type_t *points_to_right
1138 = skip_typeref(type_right->pointer.points_to);
1139 assign_error_t res = ASSIGN_SUCCESS;
1141 /* the left type has all qualifiers from the right type */
1142 unsigned missing_qualifiers
1143 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1144 if (missing_qualifiers != 0) {
1145 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1148 points_to_left = get_unqualified_type(points_to_left);
1149 points_to_right = get_unqualified_type(points_to_right);
1151 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1154 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1155 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1156 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1159 if (!types_compatible(points_to_left, points_to_right)) {
1160 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1164 } else if (is_type_integer(type_right)) {
1165 return ASSIGN_WARNING_POINTER_FROM_INT;
1167 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1168 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1169 && is_type_pointer(type_right))) {
1170 return ASSIGN_SUCCESS;
1171 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1172 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1173 type_t *const unqual_type_left = get_unqualified_type(type_left);
1174 type_t *const unqual_type_right = get_unqualified_type(type_right);
1175 if (types_compatible(unqual_type_left, unqual_type_right)) {
1176 return ASSIGN_SUCCESS;
1178 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1179 return ASSIGN_WARNING_INT_FROM_POINTER;
1182 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1183 return ASSIGN_SUCCESS;
1185 return ASSIGN_ERROR_INCOMPATIBLE;
1188 static expression_t *parse_constant_expression(void)
1190 expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1192 if (!is_constant_expression(result)) {
1193 errorf(&result->base.source_position,
1194 "expression '%E' is not constant", result);
1200 static expression_t *parse_assignment_expression(void)
1202 return parse_sub_expression(PREC_ASSIGNMENT);
1205 static string_t parse_string_literals(void)
1207 assert(token.type == T_STRING_LITERAL);
1208 string_t result = token.v.string;
1212 while (token.type == T_STRING_LITERAL) {
1213 result = concat_strings(&result, &token.v.string);
1220 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1221 [GNU_AK_CONST] = "const",
1222 [GNU_AK_VOLATILE] = "volatile",
1223 [GNU_AK_CDECL] = "cdecl",
1224 [GNU_AK_STDCALL] = "stdcall",
1225 [GNU_AK_FASTCALL] = "fastcall",
1226 [GNU_AK_DEPRECATED] = "deprecated",
1227 [GNU_AK_NOINLINE] = "noinline",
1228 [GNU_AK_RETURNS_TWICE] = "returns_twice",
1229 [GNU_AK_NORETURN] = "noreturn",
1230 [GNU_AK_NAKED] = "naked",
1231 [GNU_AK_PURE] = "pure",
1232 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1233 [GNU_AK_MALLOC] = "malloc",
1234 [GNU_AK_WEAK] = "weak",
1235 [GNU_AK_CONSTRUCTOR] = "constructor",
1236 [GNU_AK_DESTRUCTOR] = "destructor",
1237 [GNU_AK_NOTHROW] = "nothrow",
1238 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1239 [GNU_AK_COMMON] = "common",
1240 [GNU_AK_NOCOMMON] = "nocommon",
1241 [GNU_AK_PACKED] = "packed",
1242 [GNU_AK_SHARED] = "shared",
1243 [GNU_AK_NOTSHARED] = "notshared",
1244 [GNU_AK_USED] = "used",
1245 [GNU_AK_UNUSED] = "unused",
1246 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1247 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1248 [GNU_AK_LONGCALL] = "longcall",
1249 [GNU_AK_SHORTCALL] = "shortcall",
1250 [GNU_AK_LONG_CALL] = "long_call",
1251 [GNU_AK_SHORT_CALL] = "short_call",
1252 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1253 [GNU_AK_INTERRUPT] = "interrupt",
1254 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1255 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1256 [GNU_AK_NESTING] = "nesting",
1257 [GNU_AK_NEAR] = "near",
1258 [GNU_AK_FAR] = "far",
1259 [GNU_AK_SIGNAL] = "signal",
1260 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1261 [GNU_AK_TINY_DATA] = "tiny_data",
1262 [GNU_AK_SAVEALL] = "saveall",
1263 [GNU_AK_FLATTEN] = "flatten",
1264 [GNU_AK_SSEREGPARM] = "sseregparm",
1265 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1266 [GNU_AK_RETURN_TWICE] = "return_twice",
1267 [GNU_AK_MAY_ALIAS] = "may_alias",
1268 [GNU_AK_MS_STRUCT] = "ms_struct",
1269 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1270 [GNU_AK_DLLIMPORT] = "dllimport",
1271 [GNU_AK_DLLEXPORT] = "dllexport",
1272 [GNU_AK_ALIGNED] = "aligned",
1273 [GNU_AK_ALIAS] = "alias",
1274 [GNU_AK_SECTION] = "section",
1275 [GNU_AK_FORMAT] = "format",
1276 [GNU_AK_FORMAT_ARG] = "format_arg",
1277 [GNU_AK_WEAKREF] = "weakref",
1278 [GNU_AK_NONNULL] = "nonnull",
1279 [GNU_AK_TLS_MODEL] = "tls_model",
1280 [GNU_AK_VISIBILITY] = "visibility",
1281 [GNU_AK_REGPARM] = "regparm",
1282 [GNU_AK_MODE] = "mode",
1283 [GNU_AK_MODEL] = "model",
1284 [GNU_AK_TRAP_EXIT] = "trap_exit",
1285 [GNU_AK_SP_SWITCH] = "sp_switch",
1286 [GNU_AK_SENTINEL] = "sentinel"
1290 * compare two string, ignoring double underscores on the second.
1292 static int strcmp_underscore(const char *s1, const char *s2)
1294 if (s2[0] == '_' && s2[1] == '_') {
1295 size_t len2 = strlen(s2);
1296 size_t len1 = strlen(s1);
1297 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1298 return strncmp(s1, s2+2, len2-4);
1302 return strcmp(s1, s2);
1306 * Allocate a new gnu temporal attribute of given kind.
1308 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1310 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1311 attribute->kind = kind;
1312 attribute->next = NULL;
1313 attribute->invalid = false;
1314 attribute->has_arguments = false;
1320 * Parse one constant expression argument of the given attribute.
1322 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1324 expression_t *expression;
1325 add_anchor_token(')');
1326 expression = parse_constant_expression();
1327 rem_anchor_token(')');
1328 expect(')', end_error);
1329 attribute->u.argument = fold_constant(expression);
1332 attribute->invalid = true;
1336 * Parse a list of constant expressions arguments of the given attribute.
1338 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1340 argument_list_t **list = &attribute->u.arguments;
1341 argument_list_t *entry;
1342 expression_t *expression;
1343 add_anchor_token(')');
1344 add_anchor_token(',');
1346 expression = parse_constant_expression();
1347 entry = obstack_alloc(&temp_obst, sizeof(entry));
1348 entry->argument = fold_constant(expression);
1351 list = &entry->next;
1352 if (token.type != ',')
1356 rem_anchor_token(',');
1357 rem_anchor_token(')');
1358 expect(')', end_error);
1361 attribute->invalid = true;
1365 * Parse one string literal argument of the given attribute.
1367 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1370 add_anchor_token('(');
1371 if (token.type != T_STRING_LITERAL) {
1372 parse_error_expected("while parsing attribute directive",
1373 T_STRING_LITERAL, NULL);
1376 *string = parse_string_literals();
1377 rem_anchor_token('(');
1378 expect(')', end_error);
1381 attribute->invalid = true;
1385 * Parse one tls model of the given attribute.
1387 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1389 static const char *const tls_models[] = {
1395 string_t string = { NULL, 0 };
1396 parse_gnu_attribute_string_arg(attribute, &string);
1397 if (string.begin != NULL) {
1398 for (size_t i = 0; i < 4; ++i) {
1399 if (strcmp(tls_models[i], string.begin) == 0) {
1400 attribute->u.value = i;
1404 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1406 attribute->invalid = true;
1410 * Parse one tls model of the given attribute.
1412 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1414 static const char *const visibilities[] = {
1420 string_t string = { NULL, 0 };
1421 parse_gnu_attribute_string_arg(attribute, &string);
1422 if (string.begin != NULL) {
1423 for (size_t i = 0; i < 4; ++i) {
1424 if (strcmp(visibilities[i], string.begin) == 0) {
1425 attribute->u.value = i;
1429 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1431 attribute->invalid = true;
1435 * Parse one (code) model of the given attribute.
1437 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1439 static const char *const visibilities[] = {
1444 string_t string = { NULL, 0 };
1445 parse_gnu_attribute_string_arg(attribute, &string);
1446 if (string.begin != NULL) {
1447 for (int i = 0; i < 3; ++i) {
1448 if (strcmp(visibilities[i], string.begin) == 0) {
1449 attribute->u.value = i;
1453 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1455 attribute->invalid = true;
1459 * Parse one mode of the given attribute.
1461 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1463 add_anchor_token(')');
1465 if (token.type != T_IDENTIFIER) {
1466 expect(T_IDENTIFIER, end_error);
1469 attribute->u.symbol = token.v.symbol;
1472 rem_anchor_token(')');
1473 expect(')', end_error);
1476 attribute->invalid = true;
1480 * Parse one interrupt argument of the given attribute.
1482 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1484 static const char *const interrupts[] = {
1491 string_t string = { NULL, 0 };
1492 parse_gnu_attribute_string_arg(attribute, &string);
1493 if (string.begin != NULL) {
1494 for (size_t i = 0; i < 5; ++i) {
1495 if (strcmp(interrupts[i], string.begin) == 0) {
1496 attribute->u.value = i;
1500 errorf(HERE, "'%s' is not an interrupt", string.begin);
1502 attribute->invalid = true;
1506 * Parse ( identifier, const expression, const expression )
1508 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1510 static const char *const format_names[] = {
1518 if (token.type != T_IDENTIFIER) {
1519 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1522 const char *name = token.v.symbol->string;
1523 for (i = 0; i < 4; ++i) {
1524 if (strcmp_underscore(format_names[i], name) == 0)
1528 if (warning.attribute)
1529 warningf(HERE, "'%s' is an unrecognized format function type", name);
1533 expect(',', end_error);
1534 add_anchor_token(')');
1535 add_anchor_token(',');
1536 parse_constant_expression();
1537 rem_anchor_token(',');
1538 rem_anchor_token(')');
1540 expect(',', end_error);
1541 add_anchor_token(')');
1542 parse_constant_expression();
1543 rem_anchor_token(')');
1544 expect(')', end_error);
1547 attribute->u.value = true;
1551 * Check that a given GNU attribute has no arguments.
1553 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1555 if (!attribute->has_arguments)
1558 /* should have no arguments */
1559 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1560 eat_until_matching_token('(');
1561 /* we have already consumed '(', so we stop before ')', eat it */
1563 attribute->invalid = true;
1567 * Parse one GNU attribute.
1569 * Note that attribute names can be specified WITH or WITHOUT
1570 * double underscores, ie const or __const__.
1572 * The following attributes are parsed without arguments
1597 * no_instrument_function
1598 * warn_unused_result
1615 * externally_visible
1623 * The following attributes are parsed with arguments
1624 * aligned( const expression )
1625 * alias( string literal )
1626 * section( string literal )
1627 * format( identifier, const expression, const expression )
1628 * format_arg( const expression )
1629 * tls_model( string literal )
1630 * visibility( string literal )
1631 * regparm( const expression )
1632 * model( string leteral )
1633 * trap_exit( const expression )
1634 * sp_switch( string literal )
1636 * The following attributes might have arguments
1637 * weak_ref( string literal )
1638 * non_null( const expression // ',' )
1639 * interrupt( string literal )
1640 * sentinel( constant expression )
1642 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1644 gnu_attribute_t *head = *attributes;
1645 gnu_attribute_t *last = *attributes;
1646 decl_modifiers_t modifiers = 0;
1647 gnu_attribute_t *attribute;
1649 eat(T___attribute__);
1650 expect('(', end_error);
1651 expect('(', end_error);
1653 if (token.type != ')') {
1654 /* find the end of the list */
1656 while (last->next != NULL)
1660 /* non-empty attribute list */
1663 if (token.type == T_const) {
1665 } else if (token.type == T_volatile) {
1667 } else if (token.type == T_cdecl) {
1668 /* __attribute__((cdecl)), WITH ms mode */
1670 } else if (token.type == T_IDENTIFIER) {
1671 const symbol_t *sym = token.v.symbol;
1674 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1681 for (i = 0; i < GNU_AK_LAST; ++i) {
1682 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1685 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1688 if (kind == GNU_AK_LAST) {
1689 if (warning.attribute)
1690 warningf(HERE, "'%s' attribute directive ignored", name);
1692 /* skip possible arguments */
1693 if (token.type == '(') {
1694 eat_until_matching_token(')');
1697 /* check for arguments */
1698 attribute = allocate_gnu_attribute(kind);
1699 if (token.type == '(') {
1701 if (token.type == ')') {
1702 /* empty args are allowed */
1705 attribute->has_arguments = true;
1709 case GNU_AK_VOLATILE:
1714 case GNU_AK_NOCOMMON:
1716 case GNU_AK_NOTSHARED:
1717 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1718 case GNU_AK_WARN_UNUSED_RESULT:
1719 case GNU_AK_LONGCALL:
1720 case GNU_AK_SHORTCALL:
1721 case GNU_AK_LONG_CALL:
1722 case GNU_AK_SHORT_CALL:
1723 case GNU_AK_FUNCTION_VECTOR:
1724 case GNU_AK_INTERRUPT_HANDLER:
1725 case GNU_AK_NMI_HANDLER:
1726 case GNU_AK_NESTING:
1730 case GNU_AK_EIGTHBIT_DATA:
1731 case GNU_AK_TINY_DATA:
1732 case GNU_AK_SAVEALL:
1733 case GNU_AK_FLATTEN:
1734 case GNU_AK_SSEREGPARM:
1735 case GNU_AK_EXTERNALLY_VISIBLE:
1736 case GNU_AK_RETURN_TWICE:
1737 case GNU_AK_MAY_ALIAS:
1738 case GNU_AK_MS_STRUCT:
1739 case GNU_AK_GCC_STRUCT:
1742 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1743 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1744 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1745 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1746 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1747 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1748 case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg;
1749 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1750 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1751 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1752 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1753 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1754 case GNU_AK_RETURNS_TWICE: modifiers |= DM_RETURNS_TWICE; goto no_arg;
1755 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1756 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1757 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1758 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1759 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1760 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1762 case GNU_AK_ALIGNED:
1763 /* __align__ may be used without an argument */
1764 if (attribute->has_arguments) {
1765 parse_gnu_attribute_const_arg(attribute);
1769 case GNU_AK_FORMAT_ARG:
1770 case GNU_AK_REGPARM:
1771 case GNU_AK_TRAP_EXIT:
1772 if (!attribute->has_arguments) {
1773 /* should have arguments */
1774 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1775 attribute->invalid = true;
1777 parse_gnu_attribute_const_arg(attribute);
1780 case GNU_AK_SECTION:
1781 case GNU_AK_SP_SWITCH:
1782 if (!attribute->has_arguments) {
1783 /* should have arguments */
1784 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1785 attribute->invalid = true;
1787 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1790 if (!attribute->has_arguments) {
1791 /* should have arguments */
1792 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1793 attribute->invalid = true;
1795 parse_gnu_attribute_format_args(attribute);
1797 case GNU_AK_WEAKREF:
1798 /* may have one string argument */
1799 if (attribute->has_arguments)
1800 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1802 case GNU_AK_NONNULL:
1803 if (attribute->has_arguments)
1804 parse_gnu_attribute_const_arg_list(attribute);
1806 case GNU_AK_TLS_MODEL:
1807 if (!attribute->has_arguments) {
1808 /* should have arguments */
1809 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1811 parse_gnu_attribute_tls_model_arg(attribute);
1813 case GNU_AK_VISIBILITY:
1814 if (!attribute->has_arguments) {
1815 /* should have arguments */
1816 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1818 parse_gnu_attribute_visibility_arg(attribute);
1821 if (!attribute->has_arguments) {
1822 /* should have arguments */
1823 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1825 parse_gnu_attribute_model_arg(attribute);
1829 if (!attribute->has_arguments) {
1830 /* should have arguments */
1831 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1833 parse_gnu_attribute_mode_arg(attribute);
1836 case GNU_AK_INTERRUPT:
1837 /* may have one string argument */
1838 if (attribute->has_arguments)
1839 parse_gnu_attribute_interrupt_arg(attribute);
1841 case GNU_AK_SENTINEL:
1842 /* may have one string argument */
1843 if (attribute->has_arguments)
1844 parse_gnu_attribute_const_arg(attribute);
1847 /* already handled */
1851 check_no_argument(attribute, name);
1854 if (attribute != NULL) {
1856 last->next = attribute;
1859 head = last = attribute;
1863 if (token.type != ',')
1868 expect(')', end_error);
1869 expect(')', end_error);
1877 * Parse GNU attributes.
1879 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1881 decl_modifiers_t modifiers = 0;
1884 switch (token.type) {
1885 case T___attribute__:
1886 modifiers |= parse_gnu_attribute(attributes);
1891 expect('(', end_error);
1892 if (token.type != T_STRING_LITERAL) {
1893 parse_error_expected("while parsing assembler attribute",
1894 T_STRING_LITERAL, NULL);
1895 eat_until_matching_token('(');
1898 parse_string_literals();
1900 expect(')', end_error);
1903 case T_cdecl: modifiers |= DM_CDECL; break;
1904 case T__fastcall: modifiers |= DM_FASTCALL; break;
1905 case T__stdcall: modifiers |= DM_STDCALL; break;
1908 /* TODO record modifier */
1910 warningf(HERE, "Ignoring declaration modifier %K", &token);
1914 default: return modifiers;
1921 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1923 static entity_t *determine_lhs_ent(expression_t *const expr,
1926 switch (expr->kind) {
1927 case EXPR_REFERENCE: {
1928 entity_t *const entity = expr->reference.entity;
1929 /* we should only find variables as lvalues... */
1930 if (entity->base.kind != ENTITY_VARIABLE
1931 && entity->base.kind != ENTITY_PARAMETER)
1937 case EXPR_ARRAY_ACCESS: {
1938 expression_t *const ref = expr->array_access.array_ref;
1939 entity_t * ent = NULL;
1940 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1941 ent = determine_lhs_ent(ref, lhs_ent);
1944 mark_vars_read(expr->select.compound, lhs_ent);
1946 mark_vars_read(expr->array_access.index, lhs_ent);
1951 if (is_type_compound(skip_typeref(expr->base.type))) {
1952 return determine_lhs_ent(expr->select.compound, lhs_ent);
1954 mark_vars_read(expr->select.compound, lhs_ent);
1959 case EXPR_UNARY_DEREFERENCE: {
1960 expression_t *const val = expr->unary.value;
1961 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1963 return determine_lhs_ent(val->unary.value, lhs_ent);
1965 mark_vars_read(val, NULL);
1971 mark_vars_read(expr, NULL);
1976 #define ENT_ANY ((entity_t*)-1)
1979 * Mark declarations, which are read. This is used to detect variables, which
1983 * x is not marked as "read", because it is only read to calculate its own new
1987 * x and y are not detected as "not read", because multiple variables are
1990 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
1992 switch (expr->kind) {
1993 case EXPR_REFERENCE: {
1994 entity_t *const entity = expr->reference.entity;
1995 if (entity->kind != ENTITY_VARIABLE
1996 && entity->kind != ENTITY_PARAMETER)
1999 if (lhs_ent != entity && lhs_ent != ENT_ANY) {
2000 if (entity->kind == ENTITY_VARIABLE) {
2001 entity->variable.read = true;
2003 entity->parameter.read = true;
2010 // TODO respect pure/const
2011 mark_vars_read(expr->call.function, NULL);
2012 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
2013 mark_vars_read(arg->expression, NULL);
2017 case EXPR_CONDITIONAL:
2018 // TODO lhs_decl should depend on whether true/false have an effect
2019 mark_vars_read(expr->conditional.condition, NULL);
2020 if (expr->conditional.true_expression != NULL)
2021 mark_vars_read(expr->conditional.true_expression, lhs_ent);
2022 mark_vars_read(expr->conditional.false_expression, lhs_ent);
2026 if (lhs_ent == ENT_ANY
2027 && !is_type_compound(skip_typeref(expr->base.type)))
2029 mark_vars_read(expr->select.compound, lhs_ent);
2032 case EXPR_ARRAY_ACCESS: {
2033 expression_t *const ref = expr->array_access.array_ref;
2034 mark_vars_read(ref, lhs_ent);
2035 lhs_ent = determine_lhs_ent(ref, lhs_ent);
2036 mark_vars_read(expr->array_access.index, lhs_ent);
2041 mark_vars_read(expr->va_arge.ap, lhs_ent);
2044 case EXPR_UNARY_CAST:
2045 /* Special case: Use void cast to mark a variable as "read" */
2046 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
2051 case EXPR_UNARY_THROW:
2052 if (expr->unary.value == NULL)
2055 case EXPR_UNARY_DEREFERENCE:
2056 case EXPR_UNARY_DELETE:
2057 case EXPR_UNARY_DELETE_ARRAY:
2058 if (lhs_ent == ENT_ANY)
2062 case EXPR_UNARY_NEGATE:
2063 case EXPR_UNARY_PLUS:
2064 case EXPR_UNARY_BITWISE_NEGATE:
2065 case EXPR_UNARY_NOT:
2066 case EXPR_UNARY_TAKE_ADDRESS:
2067 case EXPR_UNARY_POSTFIX_INCREMENT:
2068 case EXPR_UNARY_POSTFIX_DECREMENT:
2069 case EXPR_UNARY_PREFIX_INCREMENT:
2070 case EXPR_UNARY_PREFIX_DECREMENT:
2071 case EXPR_UNARY_CAST_IMPLICIT:
2072 case EXPR_UNARY_ASSUME:
2074 mark_vars_read(expr->unary.value, lhs_ent);
2077 case EXPR_BINARY_ADD:
2078 case EXPR_BINARY_SUB:
2079 case EXPR_BINARY_MUL:
2080 case EXPR_BINARY_DIV:
2081 case EXPR_BINARY_MOD:
2082 case EXPR_BINARY_EQUAL:
2083 case EXPR_BINARY_NOTEQUAL:
2084 case EXPR_BINARY_LESS:
2085 case EXPR_BINARY_LESSEQUAL:
2086 case EXPR_BINARY_GREATER:
2087 case EXPR_BINARY_GREATEREQUAL:
2088 case EXPR_BINARY_BITWISE_AND:
2089 case EXPR_BINARY_BITWISE_OR:
2090 case EXPR_BINARY_BITWISE_XOR:
2091 case EXPR_BINARY_LOGICAL_AND:
2092 case EXPR_BINARY_LOGICAL_OR:
2093 case EXPR_BINARY_SHIFTLEFT:
2094 case EXPR_BINARY_SHIFTRIGHT:
2095 case EXPR_BINARY_COMMA:
2096 case EXPR_BINARY_ISGREATER:
2097 case EXPR_BINARY_ISGREATEREQUAL:
2098 case EXPR_BINARY_ISLESS:
2099 case EXPR_BINARY_ISLESSEQUAL:
2100 case EXPR_BINARY_ISLESSGREATER:
2101 case EXPR_BINARY_ISUNORDERED:
2102 mark_vars_read(expr->binary.left, lhs_ent);
2103 mark_vars_read(expr->binary.right, lhs_ent);
2106 case EXPR_BINARY_ASSIGN:
2107 case EXPR_BINARY_MUL_ASSIGN:
2108 case EXPR_BINARY_DIV_ASSIGN:
2109 case EXPR_BINARY_MOD_ASSIGN:
2110 case EXPR_BINARY_ADD_ASSIGN:
2111 case EXPR_BINARY_SUB_ASSIGN:
2112 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2113 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2114 case EXPR_BINARY_BITWISE_AND_ASSIGN:
2115 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2116 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
2117 if (lhs_ent == ENT_ANY)
2119 lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
2120 mark_vars_read(expr->binary.right, lhs_ent);
2125 determine_lhs_ent(expr->va_starte.ap, lhs_ent);
2131 case EXPR_CHARACTER_CONSTANT:
2132 case EXPR_WIDE_CHARACTER_CONSTANT:
2133 case EXPR_STRING_LITERAL:
2134 case EXPR_WIDE_STRING_LITERAL:
2135 case EXPR_COMPOUND_LITERAL: // TODO init?
2137 case EXPR_CLASSIFY_TYPE:
2140 case EXPR_BUILTIN_SYMBOL:
2141 case EXPR_BUILTIN_CONSTANT_P:
2142 case EXPR_BUILTIN_PREFETCH:
2144 case EXPR_STATEMENT: // TODO
2145 case EXPR_LABEL_ADDRESS:
2146 case EXPR_REFERENCE_ENUM_VALUE:
2150 panic("unhandled expression");
2153 static designator_t *parse_designation(void)
2155 designator_t *result = NULL;
2156 designator_t *last = NULL;
2159 designator_t *designator;
2160 switch (token.type) {
2162 designator = allocate_ast_zero(sizeof(designator[0]));
2163 designator->source_position = token.source_position;
2165 add_anchor_token(']');
2166 designator->array_index = parse_constant_expression();
2167 rem_anchor_token(']');
2168 expect(']', end_error);
2171 designator = allocate_ast_zero(sizeof(designator[0]));
2172 designator->source_position = token.source_position;
2174 if (token.type != T_IDENTIFIER) {
2175 parse_error_expected("while parsing designator",
2176 T_IDENTIFIER, NULL);
2179 designator->symbol = token.v.symbol;
2183 expect('=', end_error);
2187 assert(designator != NULL);
2189 last->next = designator;
2191 result = designator;
2199 static initializer_t *initializer_from_string(array_type_t *type,
2200 const string_t *const string)
2202 /* TODO: check len vs. size of array type */
2205 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
2206 initializer->string.string = *string;
2211 static initializer_t *initializer_from_wide_string(array_type_t *const type,
2212 wide_string_t *const string)
2214 /* TODO: check len vs. size of array type */
2217 initializer_t *const initializer =
2218 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
2219 initializer->wide_string.string = *string;
2225 * Build an initializer from a given expression.
2227 static initializer_t *initializer_from_expression(type_t *orig_type,
2228 expression_t *expression)
2230 /* TODO check that expression is a constant expression */
2232 /* § 6.7.8.14/15 char array may be initialized by string literals */
2233 type_t *type = skip_typeref(orig_type);
2234 type_t *expr_type_orig = expression->base.type;
2235 type_t *expr_type = skip_typeref(expr_type_orig);
2236 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
2237 array_type_t *const array_type = &type->array;
2238 type_t *const element_type = skip_typeref(array_type->element_type);
2240 if (element_type->kind == TYPE_ATOMIC) {
2241 atomic_type_kind_t akind = element_type->atomic.akind;
2242 switch (expression->kind) {
2243 case EXPR_STRING_LITERAL:
2244 if (akind == ATOMIC_TYPE_CHAR
2245 || akind == ATOMIC_TYPE_SCHAR
2246 || akind == ATOMIC_TYPE_UCHAR) {
2247 return initializer_from_string(array_type,
2248 &expression->string.value);
2252 case EXPR_WIDE_STRING_LITERAL: {
2253 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
2254 if (get_unqualified_type(element_type) == bare_wchar_type) {
2255 return initializer_from_wide_string(array_type,
2256 &expression->wide_string.value);
2267 assign_error_t error = semantic_assign(type, expression);
2268 if (error == ASSIGN_ERROR_INCOMPATIBLE)
2270 report_assign_error(error, type, expression, "initializer",
2271 &expression->base.source_position);
2273 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2275 if (type->kind == TYPE_BITFIELD) {
2276 type = type->bitfield.base_type;
2279 result->value.value = create_implicit_cast(expression, type);
2285 * Checks if a given expression can be used as an constant initializer.
2287 static bool is_initializer_constant(const expression_t *expression)
2289 return is_constant_expression(expression)
2290 || is_address_constant(expression);
2294 * Parses an scalar initializer.
2296 * § 6.7.8.11; eat {} without warning
2298 static initializer_t *parse_scalar_initializer(type_t *type,
2299 bool must_be_constant)
2301 /* there might be extra {} hierarchies */
2303 if (token.type == '{') {
2305 warningf(HERE, "extra curly braces around scalar initializer");
2309 } while (token.type == '{');
2312 expression_t *expression = parse_assignment_expression();
2313 mark_vars_read(expression, NULL);
2314 if (must_be_constant && !is_initializer_constant(expression)) {
2315 errorf(&expression->base.source_position,
2316 "Initialisation expression '%E' is not constant",
2320 initializer_t *initializer = initializer_from_expression(type, expression);
2322 if (initializer == NULL) {
2323 errorf(&expression->base.source_position,
2324 "expression '%E' (type '%T') doesn't match expected type '%T'",
2325 expression, expression->base.type, type);
2330 bool additional_warning_displayed = false;
2331 while (braces > 0) {
2332 if (token.type == ',') {
2335 if (token.type != '}') {
2336 if (!additional_warning_displayed && warning.other) {
2337 warningf(HERE, "additional elements in scalar initializer");
2338 additional_warning_displayed = true;
2349 * An entry in the type path.
2351 typedef struct type_path_entry_t type_path_entry_t;
2352 struct type_path_entry_t {
2353 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2355 size_t index; /**< For array types: the current index. */
2356 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2361 * A type path expression a position inside compound or array types.
2363 typedef struct type_path_t type_path_t;
2364 struct type_path_t {
2365 type_path_entry_t *path; /**< An flexible array containing the current path. */
2366 type_t *top_type; /**< type of the element the path points */
2367 size_t max_index; /**< largest index in outermost array */
2371 * Prints a type path for debugging.
2373 static __attribute__((unused)) void debug_print_type_path(
2374 const type_path_t *path)
2376 size_t len = ARR_LEN(path->path);
2378 for (size_t i = 0; i < len; ++i) {
2379 const type_path_entry_t *entry = & path->path[i];
2381 type_t *type = skip_typeref(entry->type);
2382 if (is_type_compound(type)) {
2383 /* in gcc mode structs can have no members */
2384 if (entry->v.compound_entry == NULL) {
2388 fprintf(stderr, ".%s",
2389 entry->v.compound_entry->base.symbol->string);
2390 } else if (is_type_array(type)) {
2391 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
2393 fprintf(stderr, "-INVALID-");
2396 if (path->top_type != NULL) {
2397 fprintf(stderr, " (");
2398 print_type(path->top_type);
2399 fprintf(stderr, ")");
2404 * Return the top type path entry, ie. in a path
2405 * (type).a.b returns the b.
2407 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2409 size_t len = ARR_LEN(path->path);
2411 return &path->path[len-1];
2415 * Enlarge the type path by an (empty) element.
2417 static type_path_entry_t *append_to_type_path(type_path_t *path)
2419 size_t len = ARR_LEN(path->path);
2420 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2422 type_path_entry_t *result = & path->path[len];
2423 memset(result, 0, sizeof(result[0]));
2428 * Descending into a sub-type. Enter the scope of the current top_type.
2430 static void descend_into_subtype(type_path_t *path)
2432 type_t *orig_top_type = path->top_type;
2433 type_t *top_type = skip_typeref(orig_top_type);
2435 type_path_entry_t *top = append_to_type_path(path);
2436 top->type = top_type;
2438 if (is_type_compound(top_type)) {
2439 compound_t *compound = top_type->compound.compound;
2440 entity_t *entry = compound->members.entities;
2442 if (entry != NULL) {
2443 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2444 top->v.compound_entry = &entry->declaration;
2445 path->top_type = entry->declaration.type;
2447 path->top_type = NULL;
2449 } else if (is_type_array(top_type)) {
2451 path->top_type = top_type->array.element_type;
2453 assert(!is_type_valid(top_type));
2458 * Pop an entry from the given type path, ie. returning from
2459 * (type).a.b to (type).a
2461 static void ascend_from_subtype(type_path_t *path)
2463 type_path_entry_t *top = get_type_path_top(path);
2465 path->top_type = top->type;
2467 size_t len = ARR_LEN(path->path);
2468 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2472 * Pop entries from the given type path until the given
2473 * path level is reached.
2475 static void ascend_to(type_path_t *path, size_t top_path_level)
2477 size_t len = ARR_LEN(path->path);
2479 while (len > top_path_level) {
2480 ascend_from_subtype(path);
2481 len = ARR_LEN(path->path);
2485 static bool walk_designator(type_path_t *path, const designator_t *designator,
2486 bool used_in_offsetof)
2488 for (; designator != NULL; designator = designator->next) {
2489 type_path_entry_t *top = get_type_path_top(path);
2490 type_t *orig_type = top->type;
2492 type_t *type = skip_typeref(orig_type);
2494 if (designator->symbol != NULL) {
2495 symbol_t *symbol = designator->symbol;
2496 if (!is_type_compound(type)) {
2497 if (is_type_valid(type)) {
2498 errorf(&designator->source_position,
2499 "'.%Y' designator used for non-compound type '%T'",
2503 top->type = type_error_type;
2504 top->v.compound_entry = NULL;
2505 orig_type = type_error_type;
2507 compound_t *compound = type->compound.compound;
2508 entity_t *iter = compound->members.entities;
2509 for (; iter != NULL; iter = iter->base.next) {
2510 if (iter->base.symbol == symbol) {
2515 errorf(&designator->source_position,
2516 "'%T' has no member named '%Y'", orig_type, symbol);
2519 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2520 if (used_in_offsetof) {
2521 type_t *real_type = skip_typeref(iter->declaration.type);
2522 if (real_type->kind == TYPE_BITFIELD) {
2523 errorf(&designator->source_position,
2524 "offsetof designator '%Y' may not specify bitfield",
2530 top->type = orig_type;
2531 top->v.compound_entry = &iter->declaration;
2532 orig_type = iter->declaration.type;
2535 expression_t *array_index = designator->array_index;
2536 assert(designator->array_index != NULL);
2538 if (!is_type_array(type)) {
2539 if (is_type_valid(type)) {
2540 errorf(&designator->source_position,
2541 "[%E] designator used for non-array type '%T'",
2542 array_index, orig_type);
2547 long index = fold_constant(array_index);
2548 if (!used_in_offsetof) {
2550 errorf(&designator->source_position,
2551 "array index [%E] must be positive", array_index);
2552 } else if (type->array.size_constant) {
2553 long array_size = type->array.size;
2554 if (index >= array_size) {
2555 errorf(&designator->source_position,
2556 "designator [%E] (%d) exceeds array size %d",
2557 array_index, index, array_size);
2562 top->type = orig_type;
2563 top->v.index = (size_t) index;
2564 orig_type = type->array.element_type;
2566 path->top_type = orig_type;
2568 if (designator->next != NULL) {
2569 descend_into_subtype(path);
2578 static void advance_current_object(type_path_t *path, size_t top_path_level)
2580 type_path_entry_t *top = get_type_path_top(path);
2582 type_t *type = skip_typeref(top->type);
2583 if (is_type_union(type)) {
2584 /* in unions only the first element is initialized */
2585 top->v.compound_entry = NULL;
2586 } else if (is_type_struct(type)) {
2587 declaration_t *entry = top->v.compound_entry;
2589 entity_t *next_entity = entry->base.next;
2590 if (next_entity != NULL) {
2591 assert(is_declaration(next_entity));
2592 entry = &next_entity->declaration;
2597 top->v.compound_entry = entry;
2598 if (entry != NULL) {
2599 path->top_type = entry->type;
2602 } else if (is_type_array(type)) {
2603 assert(is_type_array(type));
2607 if (!type->array.size_constant || top->v.index < type->array.size) {
2611 assert(!is_type_valid(type));
2615 /* we're past the last member of the current sub-aggregate, try if we
2616 * can ascend in the type hierarchy and continue with another subobject */
2617 size_t len = ARR_LEN(path->path);
2619 if (len > top_path_level) {
2620 ascend_from_subtype(path);
2621 advance_current_object(path, top_path_level);
2623 path->top_type = NULL;
2628 * skip until token is found.
2630 static void skip_until(int type)
2632 while (token.type != type) {
2633 if (token.type == T_EOF)
2640 * skip any {...} blocks until a closing bracket is reached.
2642 static void skip_initializers(void)
2644 if (token.type == '{')
2647 while (token.type != '}') {
2648 if (token.type == T_EOF)
2650 if (token.type == '{') {
2658 static initializer_t *create_empty_initializer(void)
2660 static initializer_t empty_initializer
2661 = { .list = { { INITIALIZER_LIST }, 0 } };
2662 return &empty_initializer;
2666 * Parse a part of an initialiser for a struct or union,
2668 static initializer_t *parse_sub_initializer(type_path_t *path,
2669 type_t *outer_type, size_t top_path_level,
2670 parse_initializer_env_t *env)
2672 if (token.type == '}') {
2673 /* empty initializer */
2674 return create_empty_initializer();
2677 type_t *orig_type = path->top_type;
2678 type_t *type = NULL;
2680 if (orig_type == NULL) {
2681 /* We are initializing an empty compound. */
2683 type = skip_typeref(orig_type);
2686 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2689 designator_t *designator = NULL;
2690 if (token.type == '.' || token.type == '[') {
2691 designator = parse_designation();
2692 goto finish_designator;
2693 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2694 /* GNU-style designator ("identifier: value") */
2695 designator = allocate_ast_zero(sizeof(designator[0]));
2696 designator->source_position = token.source_position;
2697 designator->symbol = token.v.symbol;
2702 /* reset path to toplevel, evaluate designator from there */
2703 ascend_to(path, top_path_level);
2704 if (!walk_designator(path, designator, false)) {
2705 /* can't continue after designation error */
2709 initializer_t *designator_initializer
2710 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2711 designator_initializer->designator.designator = designator;
2712 ARR_APP1(initializer_t*, initializers, designator_initializer);
2714 orig_type = path->top_type;
2715 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2720 if (token.type == '{') {
2721 if (type != NULL && is_type_scalar(type)) {
2722 sub = parse_scalar_initializer(type, env->must_be_constant);
2726 if (env->entity != NULL) {
2728 "extra brace group at end of initializer for '%Y'",
2729 env->entity->base.symbol);
2731 errorf(HERE, "extra brace group at end of initializer");
2734 descend_into_subtype(path);
2736 add_anchor_token('}');
2737 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2739 rem_anchor_token('}');
2742 ascend_from_subtype(path);
2743 expect('}', end_error);
2745 expect('}', end_error);
2746 goto error_parse_next;
2750 /* must be an expression */
2751 expression_t *expression = parse_assignment_expression();
2752 mark_vars_read(expression, NULL);
2754 if (env->must_be_constant && !is_initializer_constant(expression)) {
2755 errorf(&expression->base.source_position,
2756 "Initialisation expression '%E' is not constant",
2761 /* we are already outside, ... */
2762 type_t *const outer_type_skip = skip_typeref(outer_type);
2763 if (is_type_compound(outer_type_skip) &&
2764 !outer_type_skip->compound.compound->complete) {
2765 goto error_parse_next;
2770 /* handle { "string" } special case */
2771 if ((expression->kind == EXPR_STRING_LITERAL
2772 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2773 && outer_type != NULL) {
2774 sub = initializer_from_expression(outer_type, expression);
2776 if (token.type == ',') {
2779 if (token.type != '}' && warning.other) {
2780 warningf(HERE, "excessive elements in initializer for type '%T'",
2783 /* TODO: eat , ... */
2788 /* descend into subtypes until expression matches type */
2790 orig_type = path->top_type;
2791 type = skip_typeref(orig_type);
2793 sub = initializer_from_expression(orig_type, expression);
2797 if (!is_type_valid(type)) {
2800 if (is_type_scalar(type)) {
2801 errorf(&expression->base.source_position,
2802 "expression '%E' doesn't match expected type '%T'",
2803 expression, orig_type);
2807 descend_into_subtype(path);
2811 /* update largest index of top array */
2812 const type_path_entry_t *first = &path->path[0];
2813 type_t *first_type = first->type;
2814 first_type = skip_typeref(first_type);
2815 if (is_type_array(first_type)) {
2816 size_t index = first->v.index;
2817 if (index > path->max_index)
2818 path->max_index = index;
2822 /* append to initializers list */
2823 ARR_APP1(initializer_t*, initializers, sub);
2826 if (warning.other) {
2827 if (env->entity != NULL) {
2828 warningf(HERE, "excess elements in struct initializer for '%Y'",
2829 env->entity->base.symbol);
2831 warningf(HERE, "excess elements in struct initializer");
2837 if (token.type == '}') {
2840 expect(',', end_error);
2841 if (token.type == '}') {
2846 /* advance to the next declaration if we are not at the end */
2847 advance_current_object(path, top_path_level);
2848 orig_type = path->top_type;
2849 if (orig_type != NULL)
2850 type = skip_typeref(orig_type);
2856 size_t len = ARR_LEN(initializers);
2857 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2858 initializer_t *result = allocate_ast_zero(size);
2859 result->kind = INITIALIZER_LIST;
2860 result->list.len = len;
2861 memcpy(&result->list.initializers, initializers,
2862 len * sizeof(initializers[0]));
2864 DEL_ARR_F(initializers);
2865 ascend_to(path, top_path_level+1);
2870 skip_initializers();
2871 DEL_ARR_F(initializers);
2872 ascend_to(path, top_path_level+1);
2877 * Parses an initializer. Parsers either a compound literal
2878 * (env->declaration == NULL) or an initializer of a declaration.
2880 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2882 type_t *type = skip_typeref(env->type);
2883 size_t max_index = 0xdeadbeaf; // TODO: Resolve this uninitialized variable problem
2884 initializer_t *result;
2886 if (is_type_scalar(type)) {
2887 result = parse_scalar_initializer(type, env->must_be_constant);
2888 } else if (token.type == '{') {
2892 memset(&path, 0, sizeof(path));
2893 path.top_type = env->type;
2894 path.path = NEW_ARR_F(type_path_entry_t, 0);
2896 descend_into_subtype(&path);
2898 add_anchor_token('}');
2899 result = parse_sub_initializer(&path, env->type, 1, env);
2900 rem_anchor_token('}');
2902 max_index = path.max_index;
2903 DEL_ARR_F(path.path);
2905 expect('}', end_error);
2907 /* parse_scalar_initializer() also works in this case: we simply
2908 * have an expression without {} around it */
2909 result = parse_scalar_initializer(type, env->must_be_constant);
2912 /* § 6.7.8:22 array initializers for arrays with unknown size determine
2913 * the array type size */
2914 if (is_type_array(type) && type->array.size_expression == NULL
2915 && result != NULL) {
2917 switch (result->kind) {
2918 case INITIALIZER_LIST:
2919 assert(max_index != 0xdeadbeaf);
2920 size = max_index + 1;
2923 case INITIALIZER_STRING:
2924 size = result->string.string.size;
2927 case INITIALIZER_WIDE_STRING:
2928 size = result->wide_string.string.size;
2931 case INITIALIZER_DESIGNATOR:
2932 case INITIALIZER_VALUE:
2933 /* can happen for parse errors */
2938 internal_errorf(HERE, "invalid initializer type");
2941 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2942 cnst->base.type = type_size_t;
2943 cnst->conste.v.int_value = size;
2945 type_t *new_type = duplicate_type(type);
2947 new_type->array.size_expression = cnst;
2948 new_type->array.size_constant = true;
2949 new_type->array.has_implicit_size = true;
2950 new_type->array.size = size;
2951 env->type = new_type;
2959 static void append_entity(scope_t *scope, entity_t *entity)
2961 if (scope->last_entity != NULL) {
2962 scope->last_entity->base.next = entity;
2964 scope->entities = entity;
2966 scope->last_entity = entity;
2970 static compound_t *parse_compound_type_specifier(bool is_struct)
2972 gnu_attribute_t *attributes = NULL;
2973 decl_modifiers_t modifiers = 0;
2980 symbol_t *symbol = NULL;
2981 compound_t *compound = NULL;
2983 if (token.type == T___attribute__) {
2984 modifiers |= parse_attributes(&attributes);
2987 if (token.type == T_IDENTIFIER) {
2988 symbol = token.v.symbol;
2991 namespace_tag_t const namespc =
2992 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2993 entity_t *entity = get_entity(symbol, namespc);
2994 if (entity != NULL) {
2995 assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION));
2996 compound = &entity->compound;
2997 if (compound->base.parent_scope != current_scope &&
2998 (token.type == '{' || token.type == ';')) {
2999 /* we're in an inner scope and have a definition. Shadow
3000 * existing definition in outer scope */
3002 } else if (compound->complete && token.type == '{') {
3003 assert(symbol != NULL);
3004 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
3005 is_struct ? "struct" : "union", symbol,
3006 &compound->base.source_position);
3007 /* clear members in the hope to avoid further errors */
3008 compound->members.entities = NULL;
3011 } else if (token.type != '{') {
3013 parse_error_expected("while parsing struct type specifier",
3014 T_IDENTIFIER, '{', NULL);
3016 parse_error_expected("while parsing union type specifier",
3017 T_IDENTIFIER, '{', NULL);
3023 if (compound == NULL) {
3024 entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
3025 entity_t *entity = allocate_entity_zero(kind);
3026 compound = &entity->compound;
3028 compound->base.namespc =
3029 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
3030 compound->base.source_position = token.source_position;
3031 compound->base.symbol = symbol;
3032 compound->base.parent_scope = current_scope;
3033 if (symbol != NULL) {
3034 environment_push(entity);
3036 append_entity(current_scope, entity);
3039 if (token.type == '{') {
3040 parse_compound_type_entries(compound);
3041 modifiers |= parse_attributes(&attributes);
3043 if (symbol == NULL) {
3044 assert(anonymous_entity == NULL);
3045 anonymous_entity = (entity_t*)compound;
3049 compound->modifiers |= modifiers;
3053 static void parse_enum_entries(type_t *const enum_type)
3057 if (token.type == '}') {
3058 errorf(HERE, "empty enum not allowed");
3063 add_anchor_token('}');
3065 if (token.type != T_IDENTIFIER) {
3066 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
3068 rem_anchor_token('}');
3072 entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE);
3073 entity->enum_value.enum_type = enum_type;
3074 entity->base.symbol = token.v.symbol;
3075 entity->base.source_position = token.source_position;
3078 if (token.type == '=') {
3080 expression_t *value = parse_constant_expression();
3082 value = create_implicit_cast(value, enum_type);
3083 entity->enum_value.value = value;
3088 record_entity(entity, false);
3090 if (token.type != ',')
3093 } while (token.type != '}');
3094 rem_anchor_token('}');
3096 expect('}', end_error);
3102 static type_t *parse_enum_specifier(void)
3104 gnu_attribute_t *attributes = NULL;
3109 if (token.type == T_IDENTIFIER) {
3110 symbol = token.v.symbol;
3113 entity = get_entity(symbol, NAMESPACE_ENUM);
3114 if (entity != NULL) {
3115 assert(entity->kind == ENTITY_ENUM);
3116 if (entity->base.parent_scope != current_scope &&
3117 (token.type == '{' || token.type == ';')) {
3118 /* we're in an inner scope and have a definition. Shadow
3119 * existing definition in outer scope */
3121 } else if (entity->enume.complete && token.type == '{') {
3122 errorf(HERE, "multiple definitions of 'enum %Y' (previous definition %P)",
3123 symbol, &entity->base.source_position);
3126 } else if (token.type != '{') {
3127 parse_error_expected("while parsing enum type specifier",
3128 T_IDENTIFIER, '{', NULL);
3135 if (entity == NULL) {
3136 entity = allocate_entity_zero(ENTITY_ENUM);
3137 entity->base.namespc = NAMESPACE_ENUM;
3138 entity->base.source_position = token.source_position;
3139 entity->base.symbol = symbol;
3140 entity->base.parent_scope = current_scope;
3143 type_t *const type = allocate_type_zero(TYPE_ENUM);
3144 type->enumt.enume = &entity->enume;
3145 type->enumt.akind = ATOMIC_TYPE_INT;
3147 if (token.type == '{') {
3148 if (symbol != NULL) {
3149 environment_push(entity);
3151 append_entity(current_scope, entity);
3152 entity->enume.complete = true;
3154 parse_enum_entries(type);
3155 parse_attributes(&attributes);
3157 if (symbol == NULL) {
3158 assert(anonymous_entity == NULL);
3159 anonymous_entity = entity;
3161 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
3162 errorf(HERE, "'enum %Y' used before definition (incomplete enums are a GNU extension)",
3170 * if a symbol is a typedef to another type, return true
3172 static bool is_typedef_symbol(symbol_t *symbol)
3174 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
3175 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
3178 static type_t *parse_typeof(void)
3184 expect('(', end_error);
3185 add_anchor_token(')');
3187 expression_t *expression = NULL;
3189 bool old_type_prop = in_type_prop;
3190 bool old_gcc_extension = in_gcc_extension;
3191 in_type_prop = true;
3193 while (token.type == T___extension__) {
3194 /* This can be a prefix to a typename or an expression. */
3196 in_gcc_extension = true;
3198 switch (token.type) {
3200 if (is_typedef_symbol(token.v.symbol)) {
3201 type = parse_typename();
3203 expression = parse_expression();
3204 type = expression->base.type;
3209 type = parse_typename();
3213 expression = parse_expression();
3214 type = expression->base.type;
3217 in_type_prop = old_type_prop;
3218 in_gcc_extension = old_gcc_extension;
3220 rem_anchor_token(')');
3221 expect(')', end_error);
3223 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
3224 typeof_type->typeoft.expression = expression;
3225 typeof_type->typeoft.typeof_type = type;
3232 typedef enum specifiers_t {
3233 SPECIFIER_SIGNED = 1 << 0,
3234 SPECIFIER_UNSIGNED = 1 << 1,
3235 SPECIFIER_LONG = 1 << 2,
3236 SPECIFIER_INT = 1 << 3,
3237 SPECIFIER_DOUBLE = 1 << 4,
3238 SPECIFIER_CHAR = 1 << 5,
3239 SPECIFIER_WCHAR_T = 1 << 6,
3240 SPECIFIER_SHORT = 1 << 7,
3241 SPECIFIER_LONG_LONG = 1 << 8,
3242 SPECIFIER_FLOAT = 1 << 9,
3243 SPECIFIER_BOOL = 1 << 10,
3244 SPECIFIER_VOID = 1 << 11,
3245 SPECIFIER_INT8 = 1 << 12,
3246 SPECIFIER_INT16 = 1 << 13,
3247 SPECIFIER_INT32 = 1 << 14,
3248 SPECIFIER_INT64 = 1 << 15,
3249 SPECIFIER_INT128 = 1 << 16,
3250 SPECIFIER_COMPLEX = 1 << 17,
3251 SPECIFIER_IMAGINARY = 1 << 18,
3254 static type_t *create_builtin_type(symbol_t *const symbol,
3255 type_t *const real_type)
3257 type_t *type = allocate_type_zero(TYPE_BUILTIN);
3258 type->builtin.symbol = symbol;
3259 type->builtin.real_type = real_type;
3260 return identify_new_type(type);
3263 static type_t *get_typedef_type(symbol_t *symbol)
3265 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3266 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
3269 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
3270 type->typedeft.typedefe = &entity->typedefe;
3276 * check for the allowed MS alignment values.
3278 static bool check_alignment_value(long long intvalue)
3280 if (intvalue < 1 || intvalue > 8192) {
3281 errorf(HERE, "illegal alignment value");
3284 unsigned v = (unsigned)intvalue;
3285 for (unsigned i = 1; i <= 8192; i += i) {
3289 errorf(HERE, "alignment must be power of two");
3293 #define DET_MOD(name, tag) do { \
3294 if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \
3295 *modifiers |= tag; \
3298 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
3300 decl_modifiers_t *modifiers = &specifiers->modifiers;
3303 if (token.type == T_restrict) {
3305 DET_MOD(restrict, DM_RESTRICT);
3307 } else if (token.type != T_IDENTIFIER)
3309 symbol_t *symbol = token.v.symbol;
3310 if (symbol == sym_align) {
3312 expect('(', end_error);
3313 if (token.type != T_INTEGER)
3315 if (check_alignment_value(token.v.intvalue)) {
3316 if (specifiers->alignment != 0 && warning.other)
3317 warningf(HERE, "align used more than once");
3318 specifiers->alignment = (unsigned char)token.v.intvalue;
3321 expect(')', end_error);
3322 } else if (symbol == sym_allocate) {
3324 expect('(', end_error);
3325 if (token.type != T_IDENTIFIER)
3327 (void)token.v.symbol;
3328 expect(')', end_error);
3329 } else if (symbol == sym_dllimport) {
3331 DET_MOD(dllimport, DM_DLLIMPORT);
3332 } else if (symbol == sym_dllexport) {
3334 DET_MOD(dllexport, DM_DLLEXPORT);
3335 } else if (symbol == sym_thread) {
3337 DET_MOD(thread, DM_THREAD);
3338 } else if (symbol == sym_naked) {
3340 DET_MOD(naked, DM_NAKED);
3341 } else if (symbol == sym_noinline) {
3343 DET_MOD(noinline, DM_NOINLINE);
3344 } else if (symbol == sym_returns_twice) {
3346 DET_MOD(returns_twice, DM_RETURNS_TWICE);
3347 } else if (symbol == sym_noreturn) {
3349 DET_MOD(noreturn, DM_NORETURN);
3350 } else if (symbol == sym_nothrow) {
3352 DET_MOD(nothrow, DM_NOTHROW);
3353 } else if (symbol == sym_novtable) {
3355 DET_MOD(novtable, DM_NOVTABLE);
3356 } else if (symbol == sym_property) {
3358 expect('(', end_error);
3360 bool is_get = false;
3361 if (token.type != T_IDENTIFIER)
3363 if (token.v.symbol == sym_get) {
3365 } else if (token.v.symbol == sym_put) {
3367 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3371 expect('=', end_error);
3372 if (token.type != T_IDENTIFIER)
3375 if (specifiers->get_property_sym != NULL) {
3376 errorf(HERE, "get property name already specified");
3378 specifiers->get_property_sym = token.v.symbol;
3381 if (specifiers->put_property_sym != NULL) {
3382 errorf(HERE, "put property name already specified");
3384 specifiers->put_property_sym = token.v.symbol;
3388 if (token.type == ',') {
3394 expect(')', end_error);
3395 } else if (symbol == sym_selectany) {
3397 DET_MOD(selectany, DM_SELECTANY);
3398 } else if (symbol == sym_uuid) {
3400 expect('(', end_error);
3401 if (token.type != T_STRING_LITERAL)
3404 expect(')', end_error);
3405 } else if (symbol == sym_deprecated) {
3407 if (specifiers->deprecated != 0 && warning.other)
3408 warningf(HERE, "deprecated used more than once");
3409 specifiers->deprecated = true;
3410 if (token.type == '(') {
3412 if (token.type == T_STRING_LITERAL) {
3413 specifiers->deprecated_string = token.v.string.begin;
3416 errorf(HERE, "string literal expected");
3418 expect(')', end_error);
3420 } else if (symbol == sym_noalias) {
3422 DET_MOD(noalias, DM_NOALIAS);
3425 warningf(HERE, "Unknown modifier '%Y' ignored", token.v.symbol);
3427 if (token.type == '(')
3431 if (token.type == ',')
3438 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
3440 entity_t *entity = allocate_entity_zero(kind);
3441 entity->base.source_position = *HERE;
3442 entity->base.symbol = symbol;
3443 if (is_declaration(entity)) {
3444 entity->declaration.type = type_error_type;
3445 entity->declaration.implicit = true;
3446 } else if (kind == ENTITY_TYPEDEF) {
3447 entity->typedefe.type = type_error_type;
3448 entity->typedefe.builtin = true;
3450 if (kind != ENTITY_COMPOUND_MEMBER)
3451 record_entity(entity, false);
3455 static void parse_microsoft_based(based_spec_t *based_spec)
3457 if (token.type != T_IDENTIFIER) {
3458 parse_error_expected("while parsing __based", T_IDENTIFIER, NULL);
3461 symbol_t *symbol = token.v.symbol;
3462 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
3464 if (entity == NULL || entity->base.kind != ENTITY_VARIABLE) {
3465 errorf(HERE, "'%Y' is not a variable name.", symbol);
3466 entity = create_error_entity(symbol, ENTITY_VARIABLE);
3468 variable_t *variable = &entity->variable;
3470 if (based_spec->base_variable != NULL) {
3471 errorf(HERE, "__based type qualifier specified more than once");
3473 based_spec->source_position = token.source_position;
3474 based_spec->base_variable = variable;
3476 type_t *const type = variable->base.type;
3478 if (is_type_valid(type)) {
3479 if (! is_type_pointer(skip_typeref(type))) {
3480 errorf(HERE, "variable in __based modifier must have pointer type instead of '%T'", type);
3482 if (variable->base.base.parent_scope != file_scope) {
3483 errorf(HERE, "a nonstatic local variable may not be used in a __based specification");
3491 * Finish the construction of a struct type by calculating
3492 * its size, offsets, alignment.
3494 static void finish_struct_type(compound_type_t *type)
3496 assert(type->compound != NULL);
3498 compound_t *compound = type->compound;
3499 if (!compound->complete)
3504 il_alignment_t alignment = 1;
3505 bool need_pad = false;
3507 entity_t *entry = compound->members.entities;
3508 for (; entry != NULL; entry = entry->base.next) {
3509 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3512 type_t *m_type = skip_typeref(entry->declaration.type);
3513 if (! is_type_valid(m_type)) {
3514 /* simply ignore errors here */
3517 il_alignment_t m_alignment = m_type->base.alignment;
3518 if (m_alignment > alignment)
3519 alignment = m_alignment;
3521 offset = (size + m_alignment - 1) & -m_alignment;
3525 entry->compound_member.offset = offset;
3526 size = offset + m_type->base.size;
3528 if (type->base.alignment != 0) {
3529 alignment = type->base.alignment;
3532 offset = (size + alignment - 1) & -alignment;
3537 if (warning.padded) {
3538 warningf(&compound->base.source_position, "'%T' needs padding", type);
3541 if (compound->modifiers & DM_PACKED && warning.packed) {
3542 warningf(&compound->base.source_position,
3543 "superfluous packed attribute on '%T'", type);
3547 type->base.size = offset;
3548 type->base.alignment = alignment;
3552 * Finish the construction of an union type by calculating
3553 * its size and alignment.
3555 static void finish_union_type(compound_type_t *type)
3557 assert(type->compound != NULL);
3559 compound_t *compound = type->compound;
3560 if (! compound->complete)
3564 il_alignment_t alignment = 1;
3566 entity_t *entry = compound->members.entities;
3567 for (; entry != NULL; entry = entry->base.next) {
3568 if (entry->kind != ENTITY_COMPOUND_MEMBER)
3571 type_t *m_type = skip_typeref(entry->declaration.type);
3572 if (! is_type_valid(m_type))
3575 entry->compound_member.offset = 0;
3576 if (m_type->base.size > size)
3577 size = m_type->base.size;
3578 if (m_type->base.alignment > alignment)
3579 alignment = m_type->base.alignment;
3581 if (type->base.alignment != 0) {
3582 alignment = type->base.alignment;
3584 size = (size + alignment - 1) & -alignment;
3585 type->base.size = size;
3586 type->base.alignment = alignment;
3589 static type_t *handle_attribute_mode(const gnu_attribute_t *attribute,
3592 type_t *type = skip_typeref(orig_type);
3594 /* at least: byte, word, pointer, list of machine modes
3595 * __XXX___ is interpreted as XXX */
3597 /* This isn't really correct, the backend should provide a list of machine
3598 * specific modes (according to gcc philosophy that is...) */
3599 const char *symbol_str = attribute->u.symbol->string;
3600 bool sign = is_type_signed(type);
3601 atomic_type_kind_t akind;
3602 if (strcmp_underscore("QI", symbol_str) == 0 ||
3603 strcmp_underscore("byte", symbol_str) == 0) {
3604 akind = sign ? ATOMIC_TYPE_CHAR : ATOMIC_TYPE_UCHAR;
3605 } else if (strcmp_underscore("HI", symbol_str) == 0) {
3606 akind = sign ? ATOMIC_TYPE_SHORT : ATOMIC_TYPE_USHORT;
3607 } else if (strcmp_underscore("SI", symbol_str) == 0
3608 || strcmp_underscore("word", symbol_str) == 0
3609 || strcmp_underscore("pointer", symbol_str) == 0) {
3610 akind = sign ? ATOMIC_TYPE_INT : ATOMIC_TYPE_UINT;
3611 } else if (strcmp_underscore("DI", symbol_str) == 0) {
3612 akind = sign ? ATOMIC_TYPE_LONGLONG : ATOMIC_TYPE_ULONGLONG;
3615 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
3619 if (type->kind == TYPE_ATOMIC) {
3620 type_t *copy = duplicate_type(type);
3621 copy->atomic.akind = akind;
3622 return identify_new_type(copy);
3623 } else if (type->kind == TYPE_ENUM) {
3624 type_t *copy = duplicate_type(type);
3625 copy->enumt.akind = akind;
3626 return identify_new_type(copy);
3627 } else if (is_type_pointer(type)) {
3628 warningf(HERE, "__attribute__((mode)) on pointers not implemented yet (ignored)");
3632 errorf(HERE, "__attribute__((mode)) only allowed on integer, enum or pointer type");
3636 static type_t *handle_type_attributes(const gnu_attribute_t *attributes,
3639 const gnu_attribute_t *attribute = attributes;
3640 for ( ; attribute != NULL; attribute = attribute->next) {
3641 if (attribute->invalid)
3644 if (attribute->kind == GNU_AK_MODE) {
3645 type = handle_attribute_mode(attribute, type);
3646 } else if (attribute->kind == GNU_AK_ALIGNED) {
3647 int alignment = 32; /* TODO: fill in maximum useful alignment for
3649 if (attribute->has_arguments)
3650 alignment = attribute->u.argument;
3652 type_t *copy = duplicate_type(type);
3653 copy->base.alignment = attribute->u.argument;
3654 type = identify_new_type(copy);
3661 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3663 type_t *type = NULL;
3664 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3665 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3666 unsigned type_specifiers = 0;
3667 bool newtype = false;
3668 bool saw_error = false;
3669 bool old_gcc_extension = in_gcc_extension;
3671 specifiers->source_position = token.source_position;
3674 specifiers->modifiers
3675 |= parse_attributes(&specifiers->gnu_attributes);
3677 switch (token.type) {
3679 #define MATCH_STORAGE_CLASS(token, class) \
3681 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
3682 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3684 specifiers->storage_class = class; \
3685 if (specifiers->thread_local) \
3686 goto check_thread_storage_class; \
3690 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3691 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3692 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3693 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3694 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3698 expect('(', end_error);
3699 add_anchor_token(')');
3700 parse_microsoft_extended_decl_modifier(specifiers);
3701 rem_anchor_token(')');
3702 expect(')', end_error);
3706 if (specifiers->thread_local) {
3707 errorf(HERE, "duplicate '__thread'");
3709 specifiers->thread_local = true;
3710 check_thread_storage_class:
3711 switch (specifiers->storage_class) {
3712 case STORAGE_CLASS_EXTERN:
3713 case STORAGE_CLASS_NONE:
3714 case STORAGE_CLASS_STATIC:
3718 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_stoarge_class;
3719 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3720 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_stoarge_class;
3721 wrong_thread_stoarge_class:
3722 errorf(HERE, "'__thread' used with '%s'", wrong);
3729 /* type qualifiers */
3730 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3732 qualifiers |= qualifier; \
3736 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3737 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3738 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3739 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3740 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3741 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3742 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3743 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3745 case T___extension__:
3747 in_gcc_extension = true;
3750 /* type specifiers */
3751 #define MATCH_SPECIFIER(token, specifier, name) \
3753 if (type_specifiers & specifier) { \
3754 errorf(HERE, "multiple " name " type specifiers given"); \
3756 type_specifiers |= specifier; \
3761 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3762 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3763 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3764 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3765 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3766 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3767 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3768 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3769 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
3770 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3771 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3772 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3773 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3774 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3775 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3776 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3777 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3778 MATCH_SPECIFIER(T_wchar_t, SPECIFIER_WCHAR_T, "wchar_t");
3780 case T__forceinline:
3781 /* only in microsoft mode */
3782 specifiers->modifiers |= DM_FORCEINLINE;
3787 specifiers->is_inline = true;
3791 if (type_specifiers & SPECIFIER_LONG_LONG) {
3792 errorf(HERE, "multiple type specifiers given");
3793 } else if (type_specifiers & SPECIFIER_LONG) {
3794 type_specifiers |= SPECIFIER_LONG_LONG;
3796 type_specifiers |= SPECIFIER_LONG;
3802 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3804 type->compound.compound = parse_compound_type_specifier(true);
3805 finish_struct_type(&type->compound);
3809 type = allocate_type_zero(TYPE_COMPOUND_UNION);
3810 type->compound.compound = parse_compound_type_specifier(false);
3811 if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION)
3812 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3813 finish_union_type(&type->compound);
3817 type = parse_enum_specifier();
3820 type = parse_typeof();
3822 case T___builtin_va_list:
3823 type = duplicate_type(type_valist);
3827 case T_IDENTIFIER: {
3828 /* only parse identifier if we haven't found a type yet */
3829 if (type != NULL || type_specifiers != 0) {
3830 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3831 * declaration, so it doesn't generate errors about expecting '(' or
3833 switch (look_ahead(1)->type) {
3840 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3844 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3849 goto finish_specifiers;
3853 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3854 if (typedef_type == NULL) {
3855 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3856 * declaration, so it doesn't generate 'implicit int' followed by more
3857 * errors later on. */
3858 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3864 errorf(HERE, "%K does not name a type", &token);
3867 create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3869 type = allocate_type_zero(TYPE_TYPEDEF);
3870 type->typedeft.typedefe = &entity->typedefe;
3874 if (la1_type == '&' || la1_type == '*')
3875 goto finish_specifiers;
3880 goto finish_specifiers;
3885 type = typedef_type;
3889 /* function specifier */
3891 goto finish_specifiers;
3896 specifiers->modifiers
3897 |= parse_attributes(&specifiers->gnu_attributes);
3899 in_gcc_extension = old_gcc_extension;
3901 if (type == NULL || (saw_error && type_specifiers != 0)) {
3902 atomic_type_kind_t atomic_type;
3904 /* match valid basic types */
3905 switch (type_specifiers) {
3906 case SPECIFIER_VOID:
3907 atomic_type = ATOMIC_TYPE_VOID;
3909 case SPECIFIER_WCHAR_T:
3910 atomic_type = ATOMIC_TYPE_WCHAR_T;
3912 case SPECIFIER_CHAR:
3913 atomic_type = ATOMIC_TYPE_CHAR;
3915 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3916 atomic_type = ATOMIC_TYPE_SCHAR;
3918 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3919 atomic_type = ATOMIC_TYPE_UCHAR;
3921 case SPECIFIER_SHORT:
3922 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3923 case SPECIFIER_SHORT | SPECIFIER_INT:
3924 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3925 atomic_type = ATOMIC_TYPE_SHORT;
3927 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3928 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3929 atomic_type = ATOMIC_TYPE_USHORT;
3932 case SPECIFIER_SIGNED:
3933 case SPECIFIER_SIGNED | SPECIFIER_INT:
3934 atomic_type = ATOMIC_TYPE_INT;
3936 case SPECIFIER_UNSIGNED:
3937 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3938 atomic_type = ATOMIC_TYPE_UINT;
3940 case SPECIFIER_LONG:
3941 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3942 case SPECIFIER_LONG | SPECIFIER_INT:
3943 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3944 atomic_type = ATOMIC_TYPE_LONG;
3946 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3947 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3948 atomic_type = ATOMIC_TYPE_ULONG;
3951 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3952 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3953 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3954 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3956 atomic_type = ATOMIC_TYPE_LONGLONG;
3957 goto warn_about_long_long;
3959 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3960 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3962 atomic_type = ATOMIC_TYPE_ULONGLONG;
3963 warn_about_long_long:
3964 if (warning.long_long) {
3965 warningf(&specifiers->source_position,
3966 "ISO C90 does not support 'long long'");
3970 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3971 atomic_type = unsigned_int8_type_kind;
3974 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3975 atomic_type = unsigned_int16_type_kind;
3978 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3979 atomic_type = unsigned_int32_type_kind;
3982 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3983 atomic_type = unsigned_int64_type_kind;
3986 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3987 atomic_type = unsigned_int128_type_kind;
3990 case SPECIFIER_INT8:
3991 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3992 atomic_type = int8_type_kind;
3995 case SPECIFIER_INT16:
3996 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3997 atomic_type = int16_type_kind;
4000 case SPECIFIER_INT32:
4001 case SPECIFIER_SIGNED | SPECIFIER_INT32:
4002 atomic_type = int32_type_kind;
4005 case SPECIFIER_INT64:
4006 case SPECIFIER_SIGNED | SPECIFIER_INT64:
4007 atomic_type = int64_type_kind;
4010 case SPECIFIER_INT128:
4011 case SPECIFIER_SIGNED | SPECIFIER_INT128:
4012 atomic_type = int128_type_kind;
4015 case SPECIFIER_FLOAT:
4016 atomic_type = ATOMIC_TYPE_FLOAT;
4018 case SPECIFIER_DOUBLE:
4019 atomic_type = ATOMIC_TYPE_DOUBLE;
4021 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
4022 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
4024 case SPECIFIER_BOOL:
4025 atomic_type = ATOMIC_TYPE_BOOL;
4027 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
4028 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
4029 atomic_type = ATOMIC_TYPE_FLOAT;
4031 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
4032 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
4033 atomic_type = ATOMIC_TYPE_DOUBLE;
4035 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
4036 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
4037 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
4040 /* invalid specifier combination, give an error message */
4041 if (type_specifiers == 0) {
4045 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
4046 if (!(c_mode & _CXX) && !strict_mode) {
4047 if (warning.implicit_int) {
4048 warningf(HERE, "no type specifiers in declaration, using 'int'");
4050 atomic_type = ATOMIC_TYPE_INT;
4053 errorf(HERE, "no type specifiers given in declaration");
4055 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
4056 (type_specifiers & SPECIFIER_UNSIGNED)) {
4057 errorf(HERE, "signed and unsigned specifiers given");
4058 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
4059 errorf(HERE, "only integer types can be signed or unsigned");
4061 errorf(HERE, "multiple datatypes in declaration");
4066 if (type_specifiers & SPECIFIER_COMPLEX) {
4067 type = allocate_type_zero(TYPE_COMPLEX);
4068 type->complex.akind = atomic_type;
4069 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
4070 type = allocate_type_zero(TYPE_IMAGINARY);
4071 type->imaginary.akind = atomic_type;
4073 type = allocate_type_zero(TYPE_ATOMIC);
4074 type->atomic.akind = atomic_type;
4076 type->base.alignment = get_atomic_type_alignment(atomic_type);
4077 unsigned const size = get_atomic_type_size(atomic_type);
4079 type_specifiers & SPECIFIER_COMPLEX ? size * 2 : size;
4081 } else if (type_specifiers != 0) {
4082 errorf(HERE, "multiple datatypes in declaration");
4085 /* FIXME: check type qualifiers here */
4087 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
4088 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4089 type->base.qualifiers = qualifiers;
4090 type->base.modifiers = modifiers;
4093 type = identify_new_type(type);
4095 type = typehash_insert(type);
4098 type = handle_type_attributes(specifiers->gnu_attributes, type);
4099 specifiers->type = type;
4103 specifiers->type = type_error_type;
4107 static type_qualifiers_t parse_type_qualifiers(void)
4109 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
4112 switch (token.type) {
4113 /* type qualifiers */
4114 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
4115 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
4116 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
4117 /* microsoft extended type modifiers */
4118 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
4119 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
4120 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
4121 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
4122 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
4131 * Parses an K&R identifier list
4133 static void parse_identifier_list(scope_t *scope)
4136 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
4137 entity->base.source_position = token.source_position;
4138 entity->base.namespc = NAMESPACE_NORMAL;
4139 entity->base.symbol = token.v.symbol;
4140 /* a K&R parameter has no type, yet */
4144 append_entity(scope, entity);
4146 if (token.type != ',') {
4150 } while (token.type == T_IDENTIFIER);
4153 static entity_t *parse_parameter(void)
4155 declaration_specifiers_t specifiers;
4156 memset(&specifiers, 0, sizeof(specifiers));
4158 parse_declaration_specifiers(&specifiers);
4160 entity_t *entity = parse_declarator(&specifiers,
4161 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
4162 anonymous_entity = NULL;
4166 static void semantic_parameter_incomplete(const entity_t *entity)
4168 assert(entity->kind == ENTITY_PARAMETER);
4170 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
4171 * list in a function declarator that is part of a
4172 * definition of that function shall not have
4173 * incomplete type. */
4174 type_t *type = skip_typeref(entity->declaration.type);
4175 if (is_type_incomplete(type)) {
4176 errorf(&entity->base.source_position,
4177 "parameter '%Y' has incomplete type '%T'", entity->base.symbol,
4178 entity->declaration.type);
4183 * Parses function type parameters (and optionally creates variable_t entities
4184 * for them in a scope)
4186 static void parse_parameters(function_type_t *type, scope_t *scope)
4189 add_anchor_token(')');
4190 int saved_comma_state = save_and_reset_anchor_state(',');
4192 if (token.type == T_IDENTIFIER &&
4193 !is_typedef_symbol(token.v.symbol)) {
4194 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
4195 if (la1_type == ',' || la1_type == ')') {
4196 type->kr_style_parameters = true;
4197 type->unspecified_parameters = true;
4198 parse_identifier_list(scope);
4199 goto parameters_finished;
4203 if (token.type == ')') {
4204 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
4205 if (!(c_mode & _CXX))
4206 type->unspecified_parameters = true;
4207 goto parameters_finished;
4210 function_parameter_t *parameter;
4211 function_parameter_t *last_parameter = NULL;
4214 switch (token.type) {
4217 type->variadic = true;
4218 goto parameters_finished;
4221 case T___extension__:
4224 entity_t *entity = parse_parameter();
4225 if (entity->kind == ENTITY_TYPEDEF) {
4226 errorf(&entity->base.source_position,
4227 "typedef not allowed as function parameter");
4230 assert(is_declaration(entity));
4232 /* func(void) is not a parameter */
4233 if (last_parameter == NULL
4234 && token.type == ')'
4235 && entity->base.symbol == NULL
4236 && skip_typeref(entity->declaration.type) == type_void) {
4237 goto parameters_finished;
4239 semantic_parameter_incomplete(entity);
4241 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
4242 memset(parameter, 0, sizeof(parameter[0]));
4243 parameter->type = entity->declaration.type;
4245 if (scope != NULL) {
4246 append_entity(scope, entity);
4249 if (last_parameter != NULL) {
4250 last_parameter->next = parameter;
4252 type->parameters = parameter;
4254 last_parameter = parameter;
4259 goto parameters_finished;
4261 if (token.type != ',') {
4262 goto parameters_finished;
4268 parameters_finished:
4269 rem_anchor_token(')');
4270 expect(')', end_error);
4273 restore_anchor_state(',', saved_comma_state);
4276 typedef enum construct_type_kind_t {
4279 CONSTRUCT_REFERENCE,
4282 } construct_type_kind_t;
4284 typedef struct construct_type_t construct_type_t;
4285 struct construct_type_t {
4286 construct_type_kind_t kind;
4287 construct_type_t *next;
4290 typedef struct parsed_pointer_t parsed_pointer_t;
4291 struct parsed_pointer_t {
4292 construct_type_t construct_type;
4293 type_qualifiers_t type_qualifiers;
4294 variable_t *base_variable; /**< MS __based extension. */
4297 typedef struct parsed_reference_t parsed_reference_t;
4298 struct parsed_reference_t {
4299 construct_type_t construct_type;
4302 typedef struct construct_function_type_t construct_function_type_t;
4303 struct construct_function_type_t {
4304 construct_type_t construct_type;
4305 type_t *function_type;
4308 typedef struct parsed_array_t parsed_array_t;
4309 struct parsed_array_t {
4310 construct_type_t construct_type;
4311 type_qualifiers_t type_qualifiers;
4317 typedef struct construct_base_type_t construct_base_type_t;
4318 struct construct_base_type_t {
4319 construct_type_t construct_type;
4323 static construct_type_t *parse_pointer_declarator(variable_t *base_variable)
4327 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
4328 memset(pointer, 0, sizeof(pointer[0]));
4329 pointer->construct_type.kind = CONSTRUCT_POINTER;
4330 pointer->type_qualifiers = parse_type_qualifiers();
4331 pointer->base_variable = base_variable;
4333 return &pointer->construct_type;
4336 static construct_type_t *parse_reference_declarator(void)
4340 parsed_reference_t *reference = obstack_alloc(&temp_obst, sizeof(reference[0]));
4341 memset(reference, 0, sizeof(reference[0]));
4342 reference->construct_type.kind = CONSTRUCT_REFERENCE;
4344 return (construct_type_t*)reference;
4347 static construct_type_t *parse_array_declarator(void)
4350 add_anchor_token(']');
4352 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
4353 memset(array, 0, sizeof(array[0]));
4354 array->construct_type.kind = CONSTRUCT_ARRAY;
4356 if (token.type == T_static) {
4357 array->is_static = true;
4361 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
4362 if (type_qualifiers != 0) {
4363 if (token.type == T_static) {
4364 array->is_static = true;
4368 array->type_qualifiers = type_qualifiers;
4370 if (token.type == '*' && look_ahead(1)->type == ']') {
4371 array->is_variable = true;
4373 } else if (token.type != ']') {
4374 expression_t *const size = parse_assignment_expression();
4376 mark_vars_read(size, NULL);
4379 rem_anchor_token(']');
4380 expect(']', end_error);
4383 return &array->construct_type;
4386 static construct_type_t *parse_function_declarator(scope_t *scope,
4387 decl_modifiers_t modifiers)
4389 type_t *type = allocate_type_zero(TYPE_FUNCTION);
4390 function_type_t *ftype = &type->function;
4392 ftype->linkage = current_linkage;
4394 switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) {
4395 case DM_NONE: break;
4396 case DM_CDECL: ftype->calling_convention = CC_CDECL; break;
4397 case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break;
4398 case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break;
4399 case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break;
4402 errorf(HERE, "multiple calling conventions in declaration");
4406 parse_parameters(ftype, scope);
4408 construct_function_type_t *construct_function_type =
4409 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
4410 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
4411 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
4412 construct_function_type->function_type = type;
4414 return &construct_function_type->construct_type;
4417 typedef struct parse_declarator_env_t {
4418 decl_modifiers_t modifiers;
4420 source_position_t source_position;
4422 } parse_declarator_env_t;
4424 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env,
4425 bool may_be_abstract)
4427 /* construct a single linked list of construct_type_t's which describe
4428 * how to construct the final declarator type */
4429 construct_type_t *first = NULL;
4430 construct_type_t *last = NULL;
4431 gnu_attribute_t *attributes = NULL;
4433 decl_modifiers_t modifiers = parse_attributes(&attributes);
4435 /* MS __based extension */
4436 based_spec_t base_spec;
4437 base_spec.base_variable = NULL;
4440 construct_type_t *type;
4441 switch (token.type) {
4443 if (!(c_mode & _CXX))
4444 errorf(HERE, "references are only available for C++");
4445 if (base_spec.base_variable != NULL && warning.other) {
4446 warningf(&base_spec.source_position,
4447 "__based does not precede a pointer operator, ignored");
4449 type = parse_reference_declarator();
4451 base_spec.base_variable = NULL;
4455 type = parse_pointer_declarator(base_spec.base_variable);
4457 base_spec.base_variable = NULL;
4462 expect('(', end_error);
4463 add_anchor_token(')');
4464 parse_microsoft_based(&base_spec);
4465 rem_anchor_token(')');
4466 expect(')', end_error);
4470 goto ptr_operator_end;
4481 /* TODO: find out if this is correct */
4482 modifiers |= parse_attributes(&attributes);
4485 if (base_spec.base_variable != NULL && warning.other) {
4486 warningf(&base_spec.source_position,
4487 "__based does not precede a pointer operator, ignored");
4491 modifiers |= env->modifiers;
4492 env->modifiers = modifiers;
4495 construct_type_t *inner_types = NULL;
4497 switch (token.type) {
4500 errorf(HERE, "no identifier expected in typename");
4502 env->symbol = token.v.symbol;
4503 env->source_position = token.source_position;
4508 /* §6.7.6:2 footnote 126: Empty parentheses in a type name are
4509 * interpreted as ``function with no parameter specification'', rather
4510 * than redundant parentheses around the omitted identifier. */
4511 if (look_ahead(1)->type != ')') {
4513 add_anchor_token(')');
4514 inner_types = parse_inner_declarator(env, may_be_abstract);
4515 if (inner_types != NULL) {
4516 /* All later declarators only modify the return type */
4519 rem_anchor_token(')');
4520 expect(')', end_error);
4524 if (may_be_abstract)
4526 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4531 construct_type_t *p = last;
4534 construct_type_t *type;
4535 switch (token.type) {
4537 scope_t *scope = NULL;
4539 scope = &env->parameters;
4541 type = parse_function_declarator(scope, modifiers);
4545 type = parse_array_declarator();
4548 goto declarator_finished;
4551 /* insert in the middle of the list (behind p) */
4553 type->next = p->next;
4564 declarator_finished:
4565 /* append inner_types at the end of the list, we don't to set last anymore
4566 * as it's not needed anymore */
4568 assert(first == NULL);
4569 first = inner_types;
4571 last->next = inner_types;
4579 static void parse_declaration_attributes(entity_t *entity)
4581 gnu_attribute_t *attributes = NULL;
4582 decl_modifiers_t modifiers = parse_attributes(&attributes);
4588 if (entity->kind == ENTITY_TYPEDEF) {
4589 modifiers |= entity->typedefe.modifiers;
4590 type = entity->typedefe.type;
4592 assert(is_declaration(entity));
4593 modifiers |= entity->declaration.modifiers;
4594 type = entity->declaration.type;
4599 gnu_attribute_t *attribute = attributes;
4600 for ( ; attribute != NULL; attribute = attribute->next) {
4601 if (attribute->invalid)
4604 if (attribute->kind == GNU_AK_MODE) {
4605 type = handle_attribute_mode(attribute, type);
4606 } else if (attribute->kind == GNU_AK_ALIGNED) {
4607 int alignment = 32; /* TODO: fill in maximum usefull alignment for target machine */
4608 if (attribute->has_arguments)
4609 alignment = attribute->u.argument;
4611 if (entity->kind == ENTITY_TYPEDEF) {
4612 type_t *copy = duplicate_type(type);
4613 copy->base.alignment = attribute->u.argument;
4614 type = identify_new_type(copy);
4615 } else if(entity->kind == ENTITY_VARIABLE) {
4616 entity->variable.alignment = alignment;
4617 } else if(entity->kind == ENTITY_COMPOUND_MEMBER) {
4618 entity->compound_member.alignment = alignment;
4623 type_modifiers_t type_modifiers = type->base.modifiers;
4624 if (modifiers & DM_TRANSPARENT_UNION)
4625 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
4627 if (type->base.modifiers != type_modifiers) {
4628 type_t *copy = duplicate_type(type);
4629 copy->base.modifiers = type_modifiers;
4630 type = identify_new_type(copy);
4633 if (entity->kind == ENTITY_TYPEDEF) {
4634 entity->typedefe.type = type;
4635 entity->typedefe.modifiers = modifiers;
4637 entity->declaration.type = type;
4638 entity->declaration.modifiers = modifiers;
4642 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
4644 construct_type_t *iter = construct_list;
4645 for (; iter != NULL; iter = iter->next) {
4646 switch (iter->kind) {
4647 case CONSTRUCT_INVALID:
4648 internal_errorf(HERE, "invalid type construction found");
4649 case CONSTRUCT_FUNCTION: {
4650 construct_function_type_t *construct_function_type
4651 = (construct_function_type_t*) iter;
4653 type_t *function_type = construct_function_type->function_type;
4655 function_type->function.return_type = type;
4657 type_t *skipped_return_type = skip_typeref(type);
4659 if (is_type_function(skipped_return_type)) {
4660 errorf(HERE, "function returning function is not allowed");
4661 } else if (is_type_array(skipped_return_type)) {
4662 errorf(HERE, "function returning array is not allowed");
4664 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
4666 "type qualifiers in return type of function type are meaningless");
4670 type = function_type;
4674 case CONSTRUCT_POINTER: {
4675 if (is_type_reference(skip_typeref(type)))
4676 errorf(HERE, "cannot declare a pointer to reference");
4678 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4679 type = make_based_pointer_type(type, parsed_pointer->type_qualifiers, parsed_pointer->base_variable);
4683 case CONSTRUCT_REFERENCE:
4684 if (is_type_reference(skip_typeref(type)))
4685 errorf(HERE, "cannot declare a reference to reference");
4687 type = make_reference_type(type);
4690 case CONSTRUCT_ARRAY: {
4691 if (is_type_reference(skip_typeref(type)))
4692 errorf(HERE, "cannot declare an array of references");
4694 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4695 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
4697 expression_t *size_expression = parsed_array->size;
4698 if (size_expression != NULL) {
4700 = create_implicit_cast(size_expression, type_size_t);
4703 array_type->base.qualifiers = parsed_array->type_qualifiers;
4704 array_type->array.element_type = type;
4705 array_type->array.is_static = parsed_array->is_static;
4706 array_type->array.is_variable = parsed_array->is_variable;
4707 array_type->array.size_expression = size_expression;
4709 if (size_expression != NULL) {
4710 if (is_constant_expression(size_expression)) {
4711 array_type->array.size_constant = true;
4712 array_type->array.size
4713 = fold_constant(size_expression);
4715 array_type->array.is_vla = true;
4719 type_t *skipped_type = skip_typeref(type);
4721 if (is_type_incomplete(skipped_type)) {
4722 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4723 } else if (is_type_function(skipped_type)) {
4724 errorf(HERE, "array of functions is not allowed");
4731 /* The function type was constructed earlier. Freeing it here will
4732 * destroy other types. */
4733 if (iter->kind == CONSTRUCT_FUNCTION) {
4734 type = typehash_insert(type);
4736 type = identify_new_type(type);
4743 static type_t *automatic_type_conversion(type_t *orig_type);
4745 static type_t *semantic_parameter(const source_position_t *pos,
4747 const declaration_specifiers_t *specifiers,
4750 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
4751 * shall be adjusted to ``qualified pointer to type'',
4753 * §6.7.5.3:8 A declaration of a parameter as ``function returning
4754 * type'' shall be adjusted to ``pointer to function
4755 * returning type'', as in 6.3.2.1. */
4756 type = automatic_type_conversion(type);
4758 if (specifiers->is_inline && is_type_valid(type)) {
4759 errorf(pos, "parameter '%Y' declared 'inline'", symbol);
4762 /* §6.9.1:6 The declarations in the declaration list shall contain
4763 * no storage-class specifier other than register and no
4764 * initializations. */
4765 if (specifiers->thread_local || (
4766 specifiers->storage_class != STORAGE_CLASS_NONE &&
4767 specifiers->storage_class != STORAGE_CLASS_REGISTER)
4769 errorf(pos, "invalid storage class for parameter '%Y'", symbol);
4772 /* delay test for incomplete type, because we might have (void)
4773 * which is legal but incomplete... */
4778 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4779 declarator_flags_t flags)
4781 parse_declarator_env_t env;
4782 memset(&env, 0, sizeof(env));
4783 env.modifiers = specifiers->modifiers;
4785 construct_type_t *construct_type =
4786 parse_inner_declarator(&env, (flags & DECL_MAY_BE_ABSTRACT) != 0);
4788 construct_declarator_type(construct_type, specifiers->type);
4789 type_t *type = skip_typeref(orig_type);
4791 if (construct_type != NULL) {
4792 obstack_free(&temp_obst, construct_type);
4796 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4797 entity = allocate_entity_zero(ENTITY_TYPEDEF);
4798 entity->base.symbol = env.symbol;
4799 entity->base.source_position = env.source_position;
4800 entity->typedefe.type = orig_type;
4802 if (anonymous_entity != NULL) {
4803 if (is_type_compound(type)) {
4804 assert(anonymous_entity->compound.alias == NULL);
4805 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4806 anonymous_entity->kind == ENTITY_UNION);
4807 anonymous_entity->compound.alias = entity;
4808 anonymous_entity = NULL;
4809 } else if (is_type_enum(type)) {
4810 assert(anonymous_entity->enume.alias == NULL);
4811 assert(anonymous_entity->kind == ENTITY_ENUM);
4812 anonymous_entity->enume.alias = entity;
4813 anonymous_entity = NULL;
4817 /* create a declaration type entity */
4818 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4819 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4821 if (env.symbol != NULL) {
4822 if (specifiers->is_inline && is_type_valid(type)) {
4823 errorf(&env.source_position,
4824 "compound member '%Y' declared 'inline'", env.symbol);
4827 if (specifiers->thread_local ||
4828 specifiers->storage_class != STORAGE_CLASS_NONE) {
4829 errorf(&env.source_position,
4830 "compound member '%Y' must have no storage class",
4834 } else if (flags & DECL_IS_PARAMETER) {
4835 orig_type = semantic_parameter(&env.source_position, orig_type,
4836 specifiers, env.symbol);
4838 entity = allocate_entity_zero(ENTITY_PARAMETER);
4839 } else if (is_type_function(type)) {
4840 entity = allocate_entity_zero(ENTITY_FUNCTION);
4842 entity->function.is_inline = specifiers->is_inline;
4843 entity->function.parameters = env.parameters;
4845 if (env.symbol != NULL) {
4846 if (specifiers->thread_local || (
4847 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4848 specifiers->storage_class != STORAGE_CLASS_NONE &&
4849 specifiers->storage_class != STORAGE_CLASS_STATIC
4851 errorf(&env.source_position,
4852 "invalid storage class for function '%Y'", env.symbol);
4856 entity = allocate_entity_zero(ENTITY_VARIABLE);
4858 entity->variable.get_property_sym = specifiers->get_property_sym;
4859 entity->variable.put_property_sym = specifiers->put_property_sym;
4861 entity->variable.thread_local = specifiers->thread_local;
4863 if (env.symbol != NULL) {
4864 if (specifiers->is_inline && is_type_valid(type)) {
4865 errorf(&env.source_position,
4866 "variable '%Y' declared 'inline'", env.symbol);
4869 bool invalid_storage_class = false;
4870 if (current_scope == file_scope) {
4871 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4872 specifiers->storage_class != STORAGE_CLASS_NONE &&
4873 specifiers->storage_class != STORAGE_CLASS_STATIC) {
4874 invalid_storage_class = true;
4877 if (specifiers->thread_local &&
4878 specifiers->storage_class == STORAGE_CLASS_NONE) {
4879 invalid_storage_class = true;
4882 if (invalid_storage_class) {
4883 errorf(&env.source_position,
4884 "invalid storage class for variable '%Y'", env.symbol);
4889 if (env.symbol != NULL) {
4890 entity->base.symbol = env.symbol;
4891 entity->base.source_position = env.source_position;
4893 entity->base.source_position = specifiers->source_position;
4895 entity->base.namespc = NAMESPACE_NORMAL;
4896 entity->declaration.type = orig_type;
4897 entity->declaration.modifiers = env.modifiers;
4898 entity->declaration.deprecated_string = specifiers->deprecated_string;
4900 storage_class_t storage_class = specifiers->storage_class;
4901 entity->declaration.declared_storage_class = storage_class;
4903 if (storage_class == STORAGE_CLASS_NONE && current_scope != file_scope)
4904 storage_class = STORAGE_CLASS_AUTO;
4905 entity->declaration.storage_class = storage_class;
4908 parse_declaration_attributes(entity);
4913 static type_t *parse_abstract_declarator(type_t *base_type)
4915 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4917 type_t *result = construct_declarator_type(construct_type, base_type);
4918 if (construct_type != NULL) {
4919 obstack_free(&temp_obst, construct_type);
4926 * Check if the declaration of main is suspicious. main should be a
4927 * function with external linkage, returning int, taking either zero
4928 * arguments, two, or three arguments of appropriate types, ie.
4930 * int main([ int argc, char **argv [, char **env ] ]).
4932 * @param decl the declaration to check
4933 * @param type the function type of the declaration
4935 static void check_type_of_main(const entity_t *entity)
4937 const source_position_t *pos = &entity->base.source_position;
4938 if (entity->kind != ENTITY_FUNCTION) {
4939 warningf(pos, "'main' is not a function");
4943 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4944 warningf(pos, "'main' is normally a non-static function");
4947 type_t *type = skip_typeref(entity->declaration.type);
4948 assert(is_type_function(type));
4950 function_type_t *func_type = &type->function;
4951 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4952 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4953 func_type->return_type);
4955 const function_parameter_t *parm = func_type->parameters;
4957 type_t *const first_type = parm->type;
4958 if (!types_compatible(skip_typeref(first_type), type_int)) {
4960 "first argument of 'main' should be 'int', but is '%T'",
4965 type_t *const second_type = parm->type;
4966 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4967 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4971 type_t *const third_type = parm->type;
4972 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4973 warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4977 goto warn_arg_count;
4981 warningf(pos, "'main' takes only zero, two or three arguments");
4987 * Check if a symbol is the equal to "main".
4989 static bool is_sym_main(const symbol_t *const sym)
4991 return strcmp(sym->string, "main") == 0;
4994 static void error_redefined_as_different_kind(const source_position_t *pos,
4995 const entity_t *old, entity_kind_t new_kind)
4997 errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4998 get_entity_kind_name(old->kind), old->base.symbol,
4999 get_entity_kind_name(new_kind), &old->base.source_position);
5002 static bool is_error_entity(entity_t *const ent)
5004 if (is_declaration(ent)) {
5005 return is_type_valid(skip_typeref(ent->declaration.type));
5006 } else if (ent->kind == ENTITY_TYPEDEF) {
5007 return is_type_valid(skip_typeref(ent->typedefe.type));
5013 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
5014 * for various problems that occur for multiple definitions
5016 static entity_t *record_entity(entity_t *entity, const bool is_definition)
5018 const symbol_t *const symbol = entity->base.symbol;
5019 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
5020 const source_position_t *pos = &entity->base.source_position;
5022 /* can happen in error cases */
5026 entity_t *previous_entity = get_entity(symbol, namespc);
5027 /* pushing the same entity twice will break the stack structure */
5028 assert(previous_entity != entity);
5030 if (entity->kind == ENTITY_FUNCTION) {
5031 type_t *const orig_type = entity->declaration.type;
5032 type_t *const type = skip_typeref(orig_type);
5034 assert(is_type_function(type));
5035 if (type->function.unspecified_parameters &&
5036 warning.strict_prototypes &&
5037 previous_entity == NULL) {
5038 warningf(pos, "function declaration '%#T' is not a prototype",
5042 if (warning.main && current_scope == file_scope
5043 && is_sym_main(symbol)) {
5044 check_type_of_main(entity);
5048 if (is_declaration(entity) &&
5049 warning.nested_externs &&
5050 entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
5051 current_scope != file_scope) {
5052 warningf(pos, "nested extern declaration of '%#T'",
5053 entity->declaration.type, symbol);
5056 if (previous_entity != NULL &&
5057 previous_entity->base.parent_scope == ¤t_function->parameters &&
5058 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
5059 assert(previous_entity->kind == ENTITY_PARAMETER);
5061 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
5062 entity->declaration.type, symbol,
5063 previous_entity->declaration.type, symbol,
5064 &previous_entity->base.source_position);
5068 if (previous_entity != NULL &&
5069 previous_entity->base.parent_scope == current_scope) {
5070 if (previous_entity->kind != entity->kind) {
5071 if (!is_error_entity(previous_entity) && !is_error_entity(entity)) {
5072 error_redefined_as_different_kind(pos, previous_entity,
5077 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
5078 errorf(pos, "redeclaration of enum entry '%Y' (declared %P)",
5079 symbol, &previous_entity->base.source_position);
5082 if (previous_entity->kind == ENTITY_TYPEDEF) {
5083 /* TODO: C++ allows this for exactly the same type */
5084 errorf(pos, "redefinition of typedef '%Y' (declared %P)",
5085 symbol, &previous_entity->base.source_position);
5089 /* at this point we should have only VARIABLES or FUNCTIONS */
5090 assert(is_declaration(previous_entity) && is_declaration(entity));
5092 declaration_t *const prev_decl = &previous_entity->declaration;
5093 declaration_t *const decl = &entity->declaration;
5095 /* can happen for K&R style declarations */
5096 if (prev_decl->type == NULL &&
5097 previous_entity->kind == ENTITY_PARAMETER &&
5098 entity->kind == ENTITY_PARAMETER) {
5099 prev_decl->type = decl->type;
5100 prev_decl->storage_class = decl->storage_class;
5101 prev_decl->declared_storage_class = decl->declared_storage_class;
5102 prev_decl->modifiers = decl->modifiers;
5103 prev_decl->deprecated_string = decl->deprecated_string;
5104 return previous_entity;
5107 type_t *const orig_type = decl->type;
5108 assert(orig_type != NULL);
5109 type_t *const type = skip_typeref(orig_type);
5110 type_t *const prev_type = skip_typeref(prev_decl->type);
5112 if (!types_compatible(type, prev_type)) {
5114 "declaration '%#T' is incompatible with '%#T' (declared %P)",
5115 orig_type, symbol, prev_decl->type, symbol,
5116 &previous_entity->base.source_position);
5118 unsigned old_storage_class = prev_decl->storage_class;
5119 if (warning.redundant_decls &&
5122 !(prev_decl->modifiers & DM_USED) &&
5123 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
5124 warningf(&previous_entity->base.source_position,
5125 "unnecessary static forward declaration for '%#T'",
5126 prev_decl->type, symbol);
5129 storage_class_t new_storage_class = decl->storage_class;
5131 /* pretend no storage class means extern for function
5132 * declarations (except if the previous declaration is neither
5133 * none nor extern) */
5134 if (entity->kind == ENTITY_FUNCTION) {
5135 /* the previous declaration could have unspecified parameters or
5136 * be a typedef, so use the new type */
5137 if (prev_type->function.unspecified_parameters || is_definition)
5138 prev_decl->type = type;
5140 switch (old_storage_class) {
5141 case STORAGE_CLASS_NONE:
5142 old_storage_class = STORAGE_CLASS_EXTERN;
5145 case STORAGE_CLASS_EXTERN:
5146 if (is_definition) {
5147 if (warning.missing_prototypes &&
5148 prev_type->function.unspecified_parameters &&
5149 !is_sym_main(symbol)) {
5150 warningf(pos, "no previous prototype for '%#T'",
5153 } else if (new_storage_class == STORAGE_CLASS_NONE) {
5154 new_storage_class = STORAGE_CLASS_EXTERN;
5161 } else if (is_type_incomplete(prev_type)) {
5162 prev_decl->type = type;
5165 if (old_storage_class == STORAGE_CLASS_EXTERN &&
5166 new_storage_class == STORAGE_CLASS_EXTERN) {
5167 warn_redundant_declaration:
5168 if (!is_definition &&
5169 warning.redundant_decls &&
5170 is_type_valid(prev_type) &&
5171 strcmp(previous_entity->base.source_position.input_name,
5172 "<builtin>") != 0) {
5174 "redundant declaration for '%Y' (declared %P)",
5175 symbol, &previous_entity->base.source_position);
5177 } else if (current_function == NULL) {
5178 if (old_storage_class != STORAGE_CLASS_STATIC &&
5179 new_storage_class == STORAGE_CLASS_STATIC) {
5181 "static declaration of '%Y' follows non-static declaration (declared %P)",
5182 symbol, &previous_entity->base.source_position);
5183 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
5184 prev_decl->storage_class = STORAGE_CLASS_NONE;
5185 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
5187 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
5189 goto error_redeclaration;
5190 goto warn_redundant_declaration;
5192 } else if (is_type_valid(prev_type)) {
5193 if (old_storage_class == new_storage_class) {
5194 error_redeclaration:
5195 errorf(pos, "redeclaration of '%Y' (declared %P)",
5196 symbol, &previous_entity->base.source_position);
5199 "redeclaration of '%Y' with different linkage (declared %P)",
5200 symbol, &previous_entity->base.source_position);
5205 prev_decl->modifiers |= decl->modifiers;
5206 if (entity->kind == ENTITY_FUNCTION) {
5207 previous_entity->function.is_inline |= entity->function.is_inline;
5209 return previous_entity;
5212 if (entity->kind == ENTITY_FUNCTION) {
5213 if (is_definition &&
5214 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
5215 if (warning.missing_prototypes && !is_sym_main(symbol)) {
5216 warningf(pos, "no previous prototype for '%#T'",
5217 entity->declaration.type, symbol);
5218 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
5219 warningf(pos, "no previous declaration for '%#T'",
5220 entity->declaration.type, symbol);
5223 } else if (warning.missing_declarations &&
5224 entity->kind == ENTITY_VARIABLE &&
5225 current_scope == file_scope) {
5226 declaration_t *declaration = &entity->declaration;
5227 if (declaration->storage_class == STORAGE_CLASS_NONE) {
5228 warningf(pos, "no previous declaration for '%#T'",
5229 declaration->type, symbol);
5234 assert(entity->base.parent_scope == NULL);
5235 assert(current_scope != NULL);
5237 entity->base.parent_scope = current_scope;
5238 entity->base.namespc = NAMESPACE_NORMAL;
5239 environment_push(entity);
5240 append_entity(current_scope, entity);
5245 static void parser_error_multiple_definition(entity_t *entity,
5246 const source_position_t *source_position)
5248 errorf(source_position, "multiple definition of '%Y' (declared %P)",
5249 entity->base.symbol, &entity->base.source_position);
5252 static bool is_declaration_specifier(const token_t *token,
5253 bool only_specifiers_qualifiers)
5255 switch (token->type) {
5260 return is_typedef_symbol(token->v.symbol);
5262 case T___extension__:
5264 return !only_specifiers_qualifiers;
5271 static void parse_init_declarator_rest(entity_t *entity)
5273 assert(is_declaration(entity));
5274 declaration_t *const declaration = &entity->declaration;
5278 type_t *orig_type = declaration->type;
5279 type_t *type = skip_typeref(orig_type);
5281 if (entity->kind == ENTITY_VARIABLE
5282 && entity->variable.initializer != NULL) {
5283 parser_error_multiple_definition(entity, HERE);
5286 bool must_be_constant = false;
5287 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
5288 entity->base.parent_scope == file_scope) {
5289 must_be_constant = true;
5292 if (is_type_function(type)) {
5293 errorf(&entity->base.source_position,
5294 "function '%#T' is initialized like a variable",
5295 orig_type, entity->base.symbol);
5296 orig_type = type_error_type;
5299 parse_initializer_env_t env;
5300 env.type = orig_type;
5301 env.must_be_constant = must_be_constant;
5302 env.entity = entity;
5303 current_init_decl = entity;
5305 initializer_t *initializer = parse_initializer(&env);
5306 current_init_decl = NULL;
5308 if (entity->kind == ENTITY_VARIABLE) {
5309 /* § 6.7.5:22 array initializers for arrays with unknown size
5310 * determine the array type size */
5311 declaration->type = env.type;
5312 entity->variable.initializer = initializer;
5316 /* parse rest of a declaration without any declarator */
5317 static void parse_anonymous_declaration_rest(
5318 const declaration_specifiers_t *specifiers)
5321 anonymous_entity = NULL;
5323 if (warning.other) {
5324 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
5325 specifiers->thread_local) {
5326 warningf(&specifiers->source_position,
5327 "useless storage class in empty declaration");
5330 type_t *type = specifiers->type;
5331 switch (type->kind) {
5332 case TYPE_COMPOUND_STRUCT:
5333 case TYPE_COMPOUND_UNION: {
5334 if (type->compound.compound->base.symbol == NULL) {
5335 warningf(&specifiers->source_position,
5336 "unnamed struct/union that defines no instances");
5345 warningf(&specifiers->source_position, "empty declaration");
5351 static void check_variable_type_complete(entity_t *ent)
5353 if (ent->kind != ENTITY_VARIABLE)
5356 /* §6.7:7 If an identifier for an object is declared with no linkage, the
5357 * type for the object shall be complete [...] */
5358 declaration_t *decl = &ent->declaration;
5359 if (decl->storage_class != STORAGE_CLASS_NONE)
5362 type_t *const orig_type = decl->type;
5363 type_t *const type = skip_typeref(orig_type);
5364 if (!is_type_incomplete(type))
5367 /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
5368 * are given length one. */
5369 if (is_type_array(type) && ent->base.parent_scope == file_scope) {
5370 ARR_APP1(declaration_t*, incomplete_arrays, decl);
5374 errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
5375 orig_type, ent->base.symbol);
5379 static void parse_declaration_rest(entity_t *ndeclaration,
5380 const declaration_specifiers_t *specifiers,
5381 parsed_declaration_func finished_declaration,
5382 declarator_flags_t flags)
5384 add_anchor_token(';');
5385 add_anchor_token(',');
5387 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
5389 if (token.type == '=') {
5390 parse_init_declarator_rest(entity);
5391 } else if (entity->kind == ENTITY_VARIABLE) {
5392 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
5393 * [...] where the extern specifier is explicitly used. */
5394 declaration_t *decl = &entity->declaration;
5395 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
5396 type_t *type = decl->type;
5397 if (is_type_reference(skip_typeref(type))) {
5398 errorf(&entity->base.source_position,
5399 "reference '%#T' must be initialized",
5400 type, entity->base.symbol);
5405 check_variable_type_complete(entity);
5407 if (token.type != ',')
5411 add_anchor_token('=');
5412 ndeclaration = parse_declarator(specifiers, flags);
5413 rem_anchor_token('=');
5415 expect(';', end_error);
5418 anonymous_entity = NULL;
5419 rem_anchor_token(';');
5420 rem_anchor_token(',');
5423 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
5425 symbol_t *symbol = entity->base.symbol;
5426 if (symbol == NULL) {
5427 errorf(HERE, "anonymous declaration not valid as function parameter");
5431 assert(entity->base.namespc == NAMESPACE_NORMAL);
5432 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
5433 if (previous_entity == NULL
5434 || previous_entity->base.parent_scope != current_scope) {
5435 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
5440 if (is_definition) {
5441 errorf(HERE, "parameter '%Y' is initialised", entity->base.symbol);
5444 return record_entity(entity, false);
5447 static void parse_declaration(parsed_declaration_func finished_declaration,
5448 declarator_flags_t flags)
5450 declaration_specifiers_t specifiers;
5451 memset(&specifiers, 0, sizeof(specifiers));
5453 add_anchor_token(';');
5454 parse_declaration_specifiers(&specifiers);
5455 rem_anchor_token(';');
5457 if (token.type == ';') {
5458 parse_anonymous_declaration_rest(&specifiers);
5460 entity_t *entity = parse_declarator(&specifiers, flags);
5461 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
5465 static type_t *get_default_promoted_type(type_t *orig_type)
5467 type_t *result = orig_type;
5469 type_t *type = skip_typeref(orig_type);
5470 if (is_type_integer(type)) {
5471 result = promote_integer(type);
5472 } else if (type == type_float) {
5473 result = type_double;
5479 static void parse_kr_declaration_list(entity_t *entity)
5481 if (entity->kind != ENTITY_FUNCTION)
5484 type_t *type = skip_typeref(entity->declaration.type);
5485 assert(is_type_function(type));
5486 if (!type->function.kr_style_parameters)
5490 add_anchor_token('{');
5492 /* push function parameters */
5493 size_t const top = environment_top();
5494 scope_t *old_scope = scope_push(&entity->function.parameters);
5496 entity_t *parameter = entity->function.parameters.entities;
5497 for ( ; parameter != NULL; parameter = parameter->base.next) {
5498 assert(parameter->base.parent_scope == NULL);
5499 parameter->base.parent_scope = current_scope;
5500 environment_push(parameter);
5503 /* parse declaration list */
5505 switch (token.type) {
5507 case T___extension__:
5508 /* This covers symbols, which are no type, too, and results in
5509 * better error messages. The typical cases are misspelled type
5510 * names and missing includes. */
5512 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
5520 /* pop function parameters */
5521 assert(current_scope == &entity->function.parameters);
5522 scope_pop(old_scope);
5523 environment_pop_to(top);
5525 /* update function type */
5526 type_t *new_type = duplicate_type(type);
5528 function_parameter_t *parameters = NULL;
5529 function_parameter_t *last_parameter = NULL;
5531 parameter = entity->function.parameters.entities;
5532 for (; parameter != NULL; parameter = parameter->base.next) {
5533 if (parameter->kind != ENTITY_PARAMETER)
5536 type_t *parameter_type = parameter->declaration.type;
5537 if (parameter_type == NULL) {
5539 errorf(HERE, "no type specified for function parameter '%Y'",
5540 parameter->base.symbol);
5542 if (warning.implicit_int) {
5543 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
5544 parameter->base.symbol);
5546 parameter_type = type_int;
5547 parameter->declaration.type = parameter_type;
5551 semantic_parameter_incomplete(parameter);
5552 parameter_type = parameter->declaration.type;
5555 * we need the default promoted types for the function type
5557 parameter_type = get_default_promoted_type(parameter_type);
5559 function_parameter_t *function_parameter
5560 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
5561 memset(function_parameter, 0, sizeof(function_parameter[0]));
5563 function_parameter->type = parameter_type;
5564 if (last_parameter != NULL) {
5565 last_parameter->next = function_parameter;
5567 parameters = function_parameter;
5569 last_parameter = function_parameter;
5572 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
5574 new_type->function.parameters = parameters;
5575 new_type->function.unspecified_parameters = true;
5577 new_type = identify_new_type(new_type);
5579 entity->declaration.type = new_type;
5581 rem_anchor_token('{');
5584 static bool first_err = true;
5587 * When called with first_err set, prints the name of the current function,
5590 static void print_in_function(void)
5594 diagnosticf("%s: In function '%Y':\n",
5595 current_function->base.base.source_position.input_name,
5596 current_function->base.base.symbol);
5601 * Check if all labels are defined in the current function.
5602 * Check if all labels are used in the current function.
5604 static void check_labels(void)
5606 for (const goto_statement_t *goto_statement = goto_first;
5607 goto_statement != NULL;
5608 goto_statement = goto_statement->next) {
5609 /* skip computed gotos */
5610 if (goto_statement->expression != NULL)
5613 label_t *label = goto_statement->label;
5616 if (label->base.source_position.input_name == NULL) {
5617 print_in_function();
5618 errorf(&goto_statement->base.source_position,
5619 "label '%Y' used but not defined", label->base.symbol);
5623 if (warning.unused_label) {
5624 for (const label_statement_t *label_statement = label_first;
5625 label_statement != NULL;
5626 label_statement = label_statement->next) {
5627 label_t *label = label_statement->label;
5629 if (! label->used) {
5630 print_in_function();
5631 warningf(&label_statement->base.source_position,
5632 "label '%Y' defined but not used", label->base.symbol);
5638 static void warn_unused_entity(entity_t *entity, entity_t *last)
5640 entity_t const *const end = last != NULL ? last->base.next : NULL;
5641 for (; entity != end; entity = entity->base.next) {
5642 if (!is_declaration(entity))
5645 declaration_t *declaration = &entity->declaration;
5646 if (declaration->implicit)
5649 if (!declaration->used) {
5650 print_in_function();
5651 const char *what = get_entity_kind_name(entity->kind);
5652 warningf(&entity->base.source_position, "%s '%Y' is unused",
5653 what, entity->base.symbol);
5654 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5655 print_in_function();
5656 const char *what = get_entity_kind_name(entity->kind);
5657 warningf(&entity->base.source_position, "%s '%Y' is never read",
5658 what, entity->base.symbol);
5663 static void check_unused_variables(statement_t *const stmt, void *const env)
5667 switch (stmt->kind) {
5668 case STATEMENT_DECLARATION: {
5669 declaration_statement_t const *const decls = &stmt->declaration;
5670 warn_unused_entity(decls->declarations_begin,
5671 decls->declarations_end);
5676 warn_unused_entity(stmt->fors.scope.entities, NULL);
5685 * Check declarations of current_function for unused entities.
5687 static void check_declarations(void)
5689 if (warning.unused_parameter) {
5690 const scope_t *scope = ¤t_function->parameters;
5692 /* do not issue unused warnings for main */
5693 if (!is_sym_main(current_function->base.base.symbol)) {
5694 warn_unused_entity(scope->entities, NULL);
5697 if (warning.unused_variable) {
5698 walk_statements(current_function->statement, check_unused_variables,
5703 static int determine_truth(expression_t const* const cond)
5706 !is_constant_expression(cond) ? 0 :
5707 fold_constant(cond) != 0 ? 1 :
5711 static void check_reachable(statement_t *);
5712 static bool reaches_end;
5714 static bool expression_returns(expression_t const *const expr)
5716 switch (expr->kind) {
5718 expression_t const *const func = expr->call.function;
5719 if (func->kind == EXPR_REFERENCE) {
5720 entity_t *entity = func->reference.entity;
5721 if (entity->kind == ENTITY_FUNCTION
5722 && entity->declaration.modifiers & DM_NORETURN)
5726 if (!expression_returns(func))
5729 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5730 if (!expression_returns(arg->expression))
5737 case EXPR_REFERENCE:
5738 case EXPR_REFERENCE_ENUM_VALUE:
5740 case EXPR_CHARACTER_CONSTANT:
5741 case EXPR_WIDE_CHARACTER_CONSTANT:
5742 case EXPR_STRING_LITERAL:
5743 case EXPR_WIDE_STRING_LITERAL:
5744 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5745 case EXPR_LABEL_ADDRESS:
5746 case EXPR_CLASSIFY_TYPE:
5747 case EXPR_SIZEOF: // TODO handle obscure VLA case
5750 case EXPR_BUILTIN_SYMBOL:
5751 case EXPR_BUILTIN_CONSTANT_P:
5752 case EXPR_BUILTIN_PREFETCH:
5757 case EXPR_STATEMENT: {
5758 bool old_reaches_end = reaches_end;
5759 reaches_end = false;
5760 check_reachable(expr->statement.statement);
5761 bool returns = reaches_end;
5762 reaches_end = old_reaches_end;
5766 case EXPR_CONDITIONAL:
5767 // TODO handle constant expression
5769 if (!expression_returns(expr->conditional.condition))
5772 if (expr->conditional.true_expression != NULL
5773 && expression_returns(expr->conditional.true_expression))
5776 return expression_returns(expr->conditional.false_expression);
5779 return expression_returns(expr->select.compound);
5781 case EXPR_ARRAY_ACCESS:
5783 expression_returns(expr->array_access.array_ref) &&
5784 expression_returns(expr->array_access.index);
5787 return expression_returns(expr->va_starte.ap);
5790 return expression_returns(expr->va_arge.ap);
5792 EXPR_UNARY_CASES_MANDATORY
5793 return expression_returns(expr->unary.value);
5795 case EXPR_UNARY_THROW:
5799 // TODO handle constant lhs of && and ||
5801 expression_returns(expr->binary.left) &&
5802 expression_returns(expr->binary.right);
5808 panic("unhandled expression");
5811 static bool initializer_returns(initializer_t const *const init)
5813 switch (init->kind) {
5814 case INITIALIZER_VALUE:
5815 return expression_returns(init->value.value);
5817 case INITIALIZER_LIST: {
5818 initializer_t * const* i = init->list.initializers;
5819 initializer_t * const* const end = i + init->list.len;
5820 bool returns = true;
5821 for (; i != end; ++i) {
5822 if (!initializer_returns(*i))
5828 case INITIALIZER_STRING:
5829 case INITIALIZER_WIDE_STRING:
5830 case INITIALIZER_DESIGNATOR: // designators have no payload
5833 panic("unhandled initializer");
5836 static bool noreturn_candidate;
5838 static void check_reachable(statement_t *const stmt)
5840 if (stmt->base.reachable)
5842 if (stmt->kind != STATEMENT_DO_WHILE)
5843 stmt->base.reachable = true;
5845 statement_t *last = stmt;
5847 switch (stmt->kind) {
5848 case STATEMENT_INVALID:
5849 case STATEMENT_EMPTY:
5851 next = stmt->base.next;
5854 case STATEMENT_DECLARATION: {
5855 declaration_statement_t const *const decl = &stmt->declaration;
5856 entity_t const * ent = decl->declarations_begin;
5857 entity_t const *const last = decl->declarations_end;
5859 for (;; ent = ent->base.next) {
5860 if (ent->kind == ENTITY_VARIABLE &&
5861 ent->variable.initializer != NULL &&
5862 !initializer_returns(ent->variable.initializer)) {
5869 next = stmt->base.next;
5873 case STATEMENT_COMPOUND:
5874 next = stmt->compound.statements;
5876 next = stmt->base.next;
5879 case STATEMENT_RETURN: {
5880 expression_t const *const val = stmt->returns.value;
5881 if (val == NULL || expression_returns(val))
5882 noreturn_candidate = false;
5886 case STATEMENT_IF: {
5887 if_statement_t const *const ifs = &stmt->ifs;
5888 expression_t const *const cond = ifs->condition;
5890 if (!expression_returns(cond))
5893 int const val = determine_truth(cond);
5896 check_reachable(ifs->true_statement);
5901 if (ifs->false_statement != NULL) {
5902 check_reachable(ifs->false_statement);
5906 next = stmt->base.next;
5910 case STATEMENT_SWITCH: {
5911 switch_statement_t const *const switchs = &stmt->switchs;
5912 expression_t const *const expr = switchs->expression;
5914 if (!expression_returns(expr))
5917 if (is_constant_expression(expr)) {
5918 long const val = fold_constant(expr);
5919 case_label_statement_t * defaults = NULL;
5920 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5921 if (i->expression == NULL) {
5926 if (i->first_case <= val && val <= i->last_case) {
5927 check_reachable((statement_t*)i);
5932 if (defaults != NULL) {
5933 check_reachable((statement_t*)defaults);
5937 bool has_default = false;
5938 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5939 if (i->expression == NULL)
5942 check_reachable((statement_t*)i);
5949 next = stmt->base.next;
5953 case STATEMENT_EXPRESSION: {
5954 /* Check for noreturn function call */
5955 expression_t const *const expr = stmt->expression.expression;
5956 if (!expression_returns(expr))
5959 next = stmt->base.next;
5963 case STATEMENT_CONTINUE: {
5964 statement_t *parent = stmt;
5966 parent = parent->base.parent;
5967 if (parent == NULL) /* continue not within loop */
5971 switch (parent->kind) {
5972 case STATEMENT_WHILE: goto continue_while;
5973 case STATEMENT_DO_WHILE: goto continue_do_while;
5974 case STATEMENT_FOR: goto continue_for;
5981 case STATEMENT_BREAK: {
5982 statement_t *parent = stmt;
5984 parent = parent->base.parent;
5985 if (parent == NULL) /* break not within loop/switch */
5988 switch (parent->kind) {
5989 case STATEMENT_SWITCH:
5990 case STATEMENT_WHILE:
5991 case STATEMENT_DO_WHILE:
5994 next = parent->base.next;
5995 goto found_break_parent;
6004 case STATEMENT_GOTO:
6005 if (stmt->gotos.expression) {
6006 if (!expression_returns(stmt->gotos.expression))
6009 statement_t *parent = stmt->base.parent;
6010 if (parent == NULL) /* top level goto */
6014 next = stmt->gotos.label->statement;
6015 if (next == NULL) /* missing label */
6020 case STATEMENT_LABEL:
6021 next = stmt->label.statement;
6024 case STATEMENT_CASE_LABEL:
6025 next = stmt->case_label.statement;
6028 case STATEMENT_WHILE: {
6029 while_statement_t const *const whiles = &stmt->whiles;
6030 expression_t const *const cond = whiles->condition;
6032 if (!expression_returns(cond))
6035 int const val = determine_truth(cond);
6038 check_reachable(whiles->body);
6043 next = stmt->base.next;
6047 case STATEMENT_DO_WHILE:
6048 next = stmt->do_while.body;
6051 case STATEMENT_FOR: {
6052 for_statement_t *const fors = &stmt->fors;
6054 if (fors->condition_reachable)
6056 fors->condition_reachable = true;
6058 expression_t const *const cond = fors->condition;
6063 } else if (expression_returns(cond)) {
6064 val = determine_truth(cond);
6070 check_reachable(fors->body);
6075 next = stmt->base.next;
6079 case STATEMENT_MS_TRY: {
6080 ms_try_statement_t const *const ms_try = &stmt->ms_try;
6081 check_reachable(ms_try->try_statement);
6082 next = ms_try->final_statement;
6086 case STATEMENT_LEAVE: {
6087 statement_t *parent = stmt;
6089 parent = parent->base.parent;
6090 if (parent == NULL) /* __leave not within __try */
6093 if (parent->kind == STATEMENT_MS_TRY) {
6095 next = parent->ms_try.final_statement;
6103 panic("invalid statement kind");
6106 while (next == NULL) {
6107 next = last->base.parent;
6109 noreturn_candidate = false;
6111 type_t *const type = skip_typeref(current_function->base.type);
6112 assert(is_type_function(type));
6113 type_t *const ret = skip_typeref(type->function.return_type);
6114 if (warning.return_type &&
6115 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
6116 is_type_valid(ret) &&
6117 !is_sym_main(current_function->base.base.symbol)) {
6118 warningf(&stmt->base.source_position,
6119 "control reaches end of non-void function");
6124 switch (next->kind) {
6125 case STATEMENT_INVALID:
6126 case STATEMENT_EMPTY:
6127 case STATEMENT_DECLARATION:
6128 case STATEMENT_EXPRESSION:
6130 case STATEMENT_RETURN:
6131 case STATEMENT_CONTINUE:
6132 case STATEMENT_BREAK:
6133 case STATEMENT_GOTO:
6134 case STATEMENT_LEAVE:
6135 panic("invalid control flow in function");
6137 case STATEMENT_COMPOUND:
6138 if (next->compound.stmt_expr) {
6144 case STATEMENT_SWITCH:
6145 case STATEMENT_LABEL:
6146 case STATEMENT_CASE_LABEL:
6148 next = next->base.next;
6151 case STATEMENT_WHILE: {
6153 if (next->base.reachable)
6155 next->base.reachable = true;
6157 while_statement_t const *const whiles = &next->whiles;
6158 expression_t const *const cond = whiles->condition;
6160 if (!expression_returns(cond))
6163 int const val = determine_truth(cond);
6166 check_reachable(whiles->body);
6172 next = next->base.next;
6176 case STATEMENT_DO_WHILE: {
6178 if (next->base.reachable)
6180 next->base.reachable = true;
6182 do_while_statement_t const *const dw = &next->do_while;
6183 expression_t const *const cond = dw->condition;
6185 if (!expression_returns(cond))
6188 int const val = determine_truth(cond);
6191 check_reachable(dw->body);
6197 next = next->base.next;
6201 case STATEMENT_FOR: {
6203 for_statement_t *const fors = &next->fors;
6205 fors->step_reachable = true;
6207 if (fors->condition_reachable)
6209 fors->condition_reachable = true;
6211 expression_t const *const cond = fors->condition;
6216 } else if (expression_returns(cond)) {
6217 val = determine_truth(cond);
6223 check_reachable(fors->body);
6229 next = next->base.next;
6233 case STATEMENT_MS_TRY:
6235 next = next->ms_try.final_statement;
6240 check_reachable(next);
6243 static void check_unreachable(statement_t* const stmt, void *const env)
6247 switch (stmt->kind) {
6248 case STATEMENT_DO_WHILE:
6249 if (!stmt->base.reachable) {
6250 expression_t const *const cond = stmt->do_while.condition;
6251 if (determine_truth(cond) >= 0) {
6252 warningf(&cond->base.source_position,
6253 "condition of do-while-loop is unreachable");
6258 case STATEMENT_FOR: {
6259 for_statement_t const* const fors = &stmt->fors;
6261 // if init and step are unreachable, cond is unreachable, too
6262 if (!stmt->base.reachable && !fors->step_reachable) {
6263 warningf(&stmt->base.source_position, "statement is unreachable");
6265 if (!stmt->base.reachable && fors->initialisation != NULL) {
6266 warningf(&fors->initialisation->base.source_position,
6267 "initialisation of for-statement is unreachable");
6270 if (!fors->condition_reachable && fors->condition != NULL) {
6271 warningf(&fors->condition->base.source_position,
6272 "condition of for-statement is unreachable");
6275 if (!fors->step_reachable && fors->step != NULL) {
6276 warningf(&fors->step->base.source_position,
6277 "step of for-statement is unreachable");
6283 case STATEMENT_COMPOUND:
6284 if (stmt->compound.statements != NULL)
6286 goto warn_unreachable;
6288 case STATEMENT_DECLARATION: {
6289 /* Only warn if there is at least one declarator with an initializer.
6290 * This typically occurs in switch statements. */
6291 declaration_statement_t const *const decl = &stmt->declaration;
6292 entity_t const * ent = decl->declarations_begin;
6293 entity_t const *const last = decl->declarations_end;
6295 for (;; ent = ent->base.next) {
6296 if (ent->kind == ENTITY_VARIABLE &&
6297 ent->variable.initializer != NULL) {
6298 goto warn_unreachable;
6308 if (!stmt->base.reachable)
6309 warningf(&stmt->base.source_position, "statement is unreachable");
6314 static void parse_external_declaration(void)
6316 /* function-definitions and declarations both start with declaration
6318 declaration_specifiers_t specifiers;
6319 memset(&specifiers, 0, sizeof(specifiers));
6321 add_anchor_token(';');
6322 parse_declaration_specifiers(&specifiers);
6323 rem_anchor_token(';');
6325 /* must be a declaration */
6326 if (token.type == ';') {
6327 parse_anonymous_declaration_rest(&specifiers);
6331 add_anchor_token(',');
6332 add_anchor_token('=');
6333 add_anchor_token(';');
6334 add_anchor_token('{');
6336 /* declarator is common to both function-definitions and declarations */
6337 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
6339 rem_anchor_token('{');
6340 rem_anchor_token(';');
6341 rem_anchor_token('=');
6342 rem_anchor_token(',');
6344 /* must be a declaration */
6345 switch (token.type) {
6349 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
6354 /* must be a function definition */
6355 parse_kr_declaration_list(ndeclaration);
6357 if (token.type != '{') {
6358 parse_error_expected("while parsing function definition", '{', NULL);
6359 eat_until_matching_token(';');
6363 assert(is_declaration(ndeclaration));
6364 type_t *const orig_type = ndeclaration->declaration.type;
6365 type_t * type = skip_typeref(orig_type);
6367 if (!is_type_function(type)) {
6368 if (is_type_valid(type)) {
6369 errorf(HERE, "declarator '%#T' has a body but is not a function type",
6370 type, ndeclaration->base.symbol);
6374 } else if (is_typeref(orig_type)) {
6376 errorf(&ndeclaration->base.source_position,
6377 "type of function definition '%#T' is a typedef",
6378 orig_type, ndeclaration->base.symbol);
6381 if (warning.aggregate_return &&
6382 is_type_compound(skip_typeref(type->function.return_type))) {
6383 warningf(HERE, "function '%Y' returns an aggregate",
6384 ndeclaration->base.symbol);
6386 if (warning.traditional && !type->function.unspecified_parameters) {
6387 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
6388 ndeclaration->base.symbol);
6390 if (warning.old_style_definition && type->function.unspecified_parameters) {
6391 warningf(HERE, "old-style function definition '%Y'",
6392 ndeclaration->base.symbol);
6395 /* § 6.7.5.3:14 a function definition with () means no
6396 * parameters (and not unspecified parameters) */
6397 if (type->function.unspecified_parameters &&
6398 type->function.parameters == NULL &&
6399 !type->function.kr_style_parameters) {
6400 type_t *copy = duplicate_type(type);
6401 copy->function.unspecified_parameters = false;
6402 type = identify_new_type(copy);
6404 ndeclaration->declaration.type = type;
6407 entity_t *const entity = record_entity(ndeclaration, true);
6408 assert(entity->kind == ENTITY_FUNCTION);
6409 assert(ndeclaration->kind == ENTITY_FUNCTION);
6411 function_t *function = &entity->function;
6412 if (ndeclaration != entity) {
6413 function->parameters = ndeclaration->function.parameters;
6415 assert(is_declaration(entity));
6416 type = skip_typeref(entity->declaration.type);
6418 /* push function parameters and switch scope */
6419 size_t const top = environment_top();
6420 scope_t *old_scope = scope_push(&function->parameters);
6422 entity_t *parameter = function->parameters.entities;
6423 for (; parameter != NULL; parameter = parameter->base.next) {
6424 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
6425 parameter->base.parent_scope = current_scope;
6427 assert(parameter->base.parent_scope == NULL
6428 || parameter->base.parent_scope == current_scope);
6429 parameter->base.parent_scope = current_scope;
6430 if (parameter->base.symbol == NULL) {
6431 errorf(¶meter->base.source_position, "parameter name omitted");
6434 environment_push(parameter);
6437 if (function->statement != NULL) {
6438 parser_error_multiple_definition(entity, HERE);
6441 /* parse function body */
6442 int label_stack_top = label_top();
6443 function_t *old_current_function = current_function;
6444 current_function = function;
6445 current_parent = NULL;
6448 goto_anchor = &goto_first;
6450 label_anchor = &label_first;
6452 statement_t *const body = parse_compound_statement(false);
6453 function->statement = body;
6456 check_declarations();
6457 if (warning.return_type ||
6458 warning.unreachable_code ||
6459 (warning.missing_noreturn
6460 && !(function->base.modifiers & DM_NORETURN))) {
6461 noreturn_candidate = true;
6462 check_reachable(body);
6463 if (warning.unreachable_code)
6464 walk_statements(body, check_unreachable, NULL);
6465 if (warning.missing_noreturn &&
6466 noreturn_candidate &&
6467 !(function->base.modifiers & DM_NORETURN)) {
6468 warningf(&body->base.source_position,
6469 "function '%#T' is candidate for attribute 'noreturn'",
6470 type, entity->base.symbol);
6474 assert(current_parent == NULL);
6475 assert(current_function == function);
6476 current_function = old_current_function;
6477 label_pop_to(label_stack_top);
6480 assert(current_scope == &function->parameters);
6481 scope_pop(old_scope);
6482 environment_pop_to(top);
6485 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
6486 source_position_t *source_position,
6487 const symbol_t *symbol)
6489 type_t *type = allocate_type_zero(TYPE_BITFIELD);
6491 type->bitfield.base_type = base_type;
6492 type->bitfield.size_expression = size;
6495 type_t *skipped_type = skip_typeref(base_type);
6496 if (!is_type_integer(skipped_type)) {
6497 errorf(HERE, "bitfield base type '%T' is not an integer type",
6501 bit_size = skipped_type->base.size * 8;
6504 if (is_constant_expression(size)) {
6505 long v = fold_constant(size);
6508 errorf(source_position, "negative width in bit-field '%Y'", symbol);
6509 } else if (v == 0) {
6510 errorf(source_position, "zero width for bit-field '%Y'", symbol);
6511 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
6512 errorf(source_position, "width of '%Y' exceeds its type", symbol);
6514 type->bitfield.bit_size = v;
6521 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
6523 entity_t *iter = compound->members.entities;
6524 for (; iter != NULL; iter = iter->base.next) {
6525 if (iter->kind != ENTITY_COMPOUND_MEMBER)
6528 if (iter->base.symbol == symbol) {
6530 } else if (iter->base.symbol == NULL) {
6531 type_t *type = skip_typeref(iter->declaration.type);
6532 if (is_type_compound(type)) {
6534 = find_compound_entry(type->compound.compound, symbol);
6545 static void parse_compound_declarators(compound_t *compound,
6546 const declaration_specifiers_t *specifiers)
6551 if (token.type == ':') {
6552 source_position_t source_position = *HERE;
6555 type_t *base_type = specifiers->type;
6556 expression_t *size = parse_constant_expression();
6558 type_t *type = make_bitfield_type(base_type, size,
6559 &source_position, sym_anonymous);
6561 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6562 entity->base.namespc = NAMESPACE_NORMAL;
6563 entity->base.source_position = source_position;
6564 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6565 entity->declaration.storage_class = STORAGE_CLASS_NONE;
6566 entity->declaration.modifiers = specifiers->modifiers;
6567 entity->declaration.type = type;
6568 append_entity(&compound->members, entity);
6570 entity = parse_declarator(specifiers,
6571 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6572 if (entity->kind == ENTITY_TYPEDEF) {
6573 errorf(&entity->base.source_position,
6574 "typedef not allowed as compound member");
6576 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6578 /* make sure we don't define a symbol multiple times */
6579 symbol_t *symbol = entity->base.symbol;
6580 if (symbol != NULL) {
6581 entity_t *prev = find_compound_entry(compound, symbol);
6583 errorf(&entity->base.source_position,
6584 "multiple declarations of symbol '%Y' (declared %P)",
6585 symbol, &prev->base.source_position);
6589 if (token.type == ':') {
6590 source_position_t source_position = *HERE;
6592 expression_t *size = parse_constant_expression();
6594 type_t *type = entity->declaration.type;
6595 type_t *bitfield_type = make_bitfield_type(type, size,
6596 &source_position, entity->base.symbol);
6597 entity->declaration.type = bitfield_type;
6599 type_t *orig_type = entity->declaration.type;
6600 type_t *type = skip_typeref(orig_type);
6601 if (is_type_function(type)) {
6602 errorf(&entity->base.source_position,
6603 "compound member '%Y' must not have function type '%T'",
6604 entity->base.symbol, orig_type);
6605 } else if (is_type_incomplete(type)) {
6606 /* §6.7.2.1:16 flexible array member */
6607 if (is_type_array(type) &&
6608 token.type == ';' &&
6609 look_ahead(1)->type == '}') {
6610 compound->has_flexible_member = true;
6612 errorf(&entity->base.source_position,
6613 "compound member '%Y' has incomplete type '%T'",
6614 entity->base.symbol, orig_type);
6619 append_entity(&compound->members, entity);
6623 if (token.type != ',')
6627 expect(';', end_error);
6630 anonymous_entity = NULL;
6633 static void parse_compound_type_entries(compound_t *compound)
6636 add_anchor_token('}');
6638 while (token.type != '}') {
6639 if (token.type == T_EOF) {
6640 errorf(HERE, "EOF while parsing struct");
6643 declaration_specifiers_t specifiers;
6644 memset(&specifiers, 0, sizeof(specifiers));
6645 parse_declaration_specifiers(&specifiers);
6647 parse_compound_declarators(compound, &specifiers);
6649 rem_anchor_token('}');
6653 compound->complete = true;
6656 static type_t *parse_typename(void)
6658 declaration_specifiers_t specifiers;
6659 memset(&specifiers, 0, sizeof(specifiers));
6660 parse_declaration_specifiers(&specifiers);
6661 if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6662 specifiers.thread_local) {
6663 /* TODO: improve error message, user does probably not know what a
6664 * storage class is...
6666 errorf(HERE, "typename may not have a storage class");
6669 type_t *result = parse_abstract_declarator(specifiers.type);
6677 typedef expression_t* (*parse_expression_function)(void);
6678 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6680 typedef struct expression_parser_function_t expression_parser_function_t;
6681 struct expression_parser_function_t {
6682 parse_expression_function parser;
6683 precedence_t infix_precedence;
6684 parse_expression_infix_function infix_parser;
6687 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6690 * Prints an error message if an expression was expected but not read
6692 static expression_t *expected_expression_error(void)
6694 /* skip the error message if the error token was read */
6695 if (token.type != T_ERROR) {
6696 errorf(HERE, "expected expression, got token %K", &token);
6700 return create_invalid_expression();
6704 * Parse a string constant.
6706 static expression_t *parse_string_const(void)
6709 if (token.type == T_STRING_LITERAL) {
6710 string_t res = token.v.string;
6712 while (token.type == T_STRING_LITERAL) {
6713 res = concat_strings(&res, &token.v.string);
6716 if (token.type != T_WIDE_STRING_LITERAL) {
6717 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6718 /* note: that we use type_char_ptr here, which is already the
6719 * automatic converted type. revert_automatic_type_conversion
6720 * will construct the array type */
6721 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6722 cnst->string.value = res;
6726 wres = concat_string_wide_string(&res, &token.v.wide_string);
6728 wres = token.v.wide_string;
6733 switch (token.type) {
6734 case T_WIDE_STRING_LITERAL:
6735 wres = concat_wide_strings(&wres, &token.v.wide_string);
6738 case T_STRING_LITERAL:
6739 wres = concat_wide_string_string(&wres, &token.v.string);
6743 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6744 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6745 cnst->wide_string.value = wres;
6754 * Parse a boolean constant.
6756 static expression_t *parse_bool_const(bool value)
6758 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6759 cnst->base.type = type_bool;
6760 cnst->conste.v.int_value = value;
6768 * Parse an integer constant.
6770 static expression_t *parse_int_const(void)
6772 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6773 cnst->base.type = token.datatype;
6774 cnst->conste.v.int_value = token.v.intvalue;
6782 * Parse a character constant.
6784 static expression_t *parse_character_constant(void)
6786 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6787 cnst->base.type = token.datatype;
6788 cnst->conste.v.character = token.v.string;
6790 if (cnst->conste.v.character.size != 1) {
6792 errorf(HERE, "more than 1 character in character constant");
6793 } else if (warning.multichar) {
6794 warningf(HERE, "multi-character character constant");
6803 * Parse a wide character constant.
6805 static expression_t *parse_wide_character_constant(void)
6807 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6808 cnst->base.type = token.datatype;
6809 cnst->conste.v.wide_character = token.v.wide_string;
6811 if (cnst->conste.v.wide_character.size != 1) {
6813 errorf(HERE, "more than 1 character in character constant");
6814 } else if (warning.multichar) {
6815 warningf(HERE, "multi-character character constant");
6824 * Parse a float constant.
6826 static expression_t *parse_float_const(void)
6828 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6829 cnst->base.type = token.datatype;
6830 cnst->conste.v.float_value = token.v.floatvalue;
6837 static entity_t *create_implicit_function(symbol_t *symbol,
6838 const source_position_t *source_position)
6840 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6841 ntype->function.return_type = type_int;
6842 ntype->function.unspecified_parameters = true;
6843 ntype->function.linkage = LINKAGE_C;
6844 type_t *type = identify_new_type(ntype);
6846 entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6847 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6848 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6849 entity->declaration.type = type;
6850 entity->declaration.implicit = true;
6851 entity->base.symbol = symbol;
6852 entity->base.source_position = *source_position;
6854 bool strict_prototypes_old = warning.strict_prototypes;
6855 warning.strict_prototypes = false;
6856 record_entity(entity, false);
6857 warning.strict_prototypes = strict_prototypes_old;
6863 * Creates a return_type (func)(argument_type) function type if not
6866 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6867 type_t *argument_type2)
6869 function_parameter_t *parameter2
6870 = obstack_alloc(type_obst, sizeof(parameter2[0]));
6871 memset(parameter2, 0, sizeof(parameter2[0]));
6872 parameter2->type = argument_type2;
6874 function_parameter_t *parameter1
6875 = obstack_alloc(type_obst, sizeof(parameter1[0]));
6876 memset(parameter1, 0, sizeof(parameter1[0]));
6877 parameter1->type = argument_type1;
6878 parameter1->next = parameter2;
6880 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6881 type->function.return_type = return_type;
6882 type->function.parameters = parameter1;
6884 return identify_new_type(type);
6888 * Creates a return_type (func)(argument_type) function type if not
6891 * @param return_type the return type
6892 * @param argument_type the argument type
6894 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6896 function_parameter_t *parameter
6897 = obstack_alloc(type_obst, sizeof(parameter[0]));
6898 memset(parameter, 0, sizeof(parameter[0]));
6899 parameter->type = argument_type;
6901 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6902 type->function.return_type = return_type;
6903 type->function.parameters = parameter;
6905 return identify_new_type(type);
6908 static type_t *make_function_0_type(type_t *return_type)
6910 type_t *type = allocate_type_zero(TYPE_FUNCTION);
6911 type->function.return_type = return_type;
6912 type->function.parameters = NULL;
6914 return identify_new_type(type);
6918 * Creates a function type for some function like builtins.
6920 * @param symbol the symbol describing the builtin
6922 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6924 switch (symbol->ID) {
6925 case T___builtin_alloca:
6926 return make_function_1_type(type_void_ptr, type_size_t);
6927 case T___builtin_huge_val:
6928 return make_function_0_type(type_double);
6929 case T___builtin_inf:
6930 return make_function_0_type(type_double);
6931 case T___builtin_inff:
6932 return make_function_0_type(type_float);
6933 case T___builtin_infl:
6934 return make_function_0_type(type_long_double);
6935 case T___builtin_nan:
6936 return make_function_1_type(type_double, type_char_ptr);
6937 case T___builtin_nanf:
6938 return make_function_1_type(type_float, type_char_ptr);
6939 case T___builtin_nanl:
6940 return make_function_1_type(type_long_double, type_char_ptr);
6941 case T___builtin_va_end:
6942 return make_function_1_type(type_void, type_valist);
6943 case T___builtin_expect:
6944 return make_function_2_type(type_long, type_long, type_long);
6945 case T___builtin_return_address:
6946 case T___builtin_frame_address:
6947 return make_function_1_type(type_void_ptr, type_unsigned_int);
6949 internal_errorf(HERE, "not implemented builtin identifier found");
6954 * Performs automatic type cast as described in § 6.3.2.1.
6956 * @param orig_type the original type
6958 static type_t *automatic_type_conversion(type_t *orig_type)
6960 type_t *type = skip_typeref(orig_type);
6961 if (is_type_array(type)) {
6962 array_type_t *array_type = &type->array;
6963 type_t *element_type = array_type->element_type;
6964 unsigned qualifiers = array_type->base.qualifiers;
6966 return make_pointer_type(element_type, qualifiers);
6969 if (is_type_function(type)) {
6970 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6977 * reverts the automatic casts of array to pointer types and function
6978 * to function-pointer types as defined § 6.3.2.1
6980 type_t *revert_automatic_type_conversion(const expression_t *expression)
6982 switch (expression->kind) {
6983 case EXPR_REFERENCE: {
6984 entity_t *entity = expression->reference.entity;
6985 if (is_declaration(entity)) {
6986 return entity->declaration.type;
6987 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6988 return entity->enum_value.enum_type;
6990 panic("no declaration or enum in reference");
6995 entity_t *entity = expression->select.compound_entry;
6996 assert(is_declaration(entity));
6997 type_t *type = entity->declaration.type;
6998 return get_qualified_type(type,
6999 expression->base.type->base.qualifiers);
7002 case EXPR_UNARY_DEREFERENCE: {
7003 const expression_t *const value = expression->unary.value;
7004 type_t *const type = skip_typeref(value->base.type);
7005 if (!is_type_pointer(type))
7006 return type_error_type;
7007 return type->pointer.points_to;
7010 case EXPR_BUILTIN_SYMBOL:
7011 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
7013 case EXPR_ARRAY_ACCESS: {
7014 const expression_t *array_ref = expression->array_access.array_ref;
7015 type_t *type_left = skip_typeref(array_ref->base.type);
7016 if (!is_type_pointer(type_left))
7017 return type_error_type;
7018 return type_left->pointer.points_to;
7021 case EXPR_STRING_LITERAL: {
7022 size_t size = expression->string.value.size;
7023 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
7026 case EXPR_WIDE_STRING_LITERAL: {
7027 size_t size = expression->wide_string.value.size;
7028 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
7031 case EXPR_COMPOUND_LITERAL:
7032 return expression->compound_literal.type;
7035 return expression->base.type;
7039 static expression_t *parse_reference(void)
7041 symbol_t *const symbol = token.v.symbol;
7043 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
7045 if (entity == NULL) {
7046 if (!strict_mode && look_ahead(1)->type == '(') {
7047 /* an implicitly declared function */
7048 if (warning.error_implicit_function_declaration) {
7049 errorf(HERE, "implicit declaration of function '%Y'", symbol);
7050 } else if (warning.implicit_function_declaration) {
7051 warningf(HERE, "implicit declaration of function '%Y'", symbol);
7054 entity = create_implicit_function(symbol, HERE);
7056 errorf(HERE, "unknown identifier '%Y' found.", symbol);
7057 entity = create_error_entity(symbol, ENTITY_VARIABLE);
7063 if (is_declaration(entity)) {
7064 orig_type = entity->declaration.type;
7065 } else if (entity->kind == ENTITY_ENUM_VALUE) {
7066 orig_type = entity->enum_value.enum_type;
7067 } else if (entity->kind == ENTITY_TYPEDEF) {
7068 errorf(HERE, "encountered typedef name '%Y' while parsing expression",
7071 return create_invalid_expression();
7073 panic("expected declaration or enum value in reference");
7076 /* we always do the auto-type conversions; the & and sizeof parser contains
7077 * code to revert this! */
7078 type_t *type = automatic_type_conversion(orig_type);
7080 expression_kind_t kind = EXPR_REFERENCE;
7081 if (entity->kind == ENTITY_ENUM_VALUE)
7082 kind = EXPR_REFERENCE_ENUM_VALUE;
7084 expression_t *expression = allocate_expression_zero(kind);
7085 expression->reference.entity = entity;
7086 expression->base.type = type;
7088 /* this declaration is used */
7089 if (is_declaration(entity)) {
7090 entity->declaration.used = true;
7093 if (entity->base.parent_scope != file_scope
7094 && entity->base.parent_scope->depth < current_function->parameters.depth
7095 && is_type_valid(orig_type) && !is_type_function(orig_type)) {
7096 if (entity->kind == ENTITY_VARIABLE) {
7097 /* access of a variable from an outer function */
7098 entity->variable.address_taken = true;
7099 } else if (entity->kind == ENTITY_PARAMETER) {
7100 entity->parameter.address_taken = true;
7102 current_function->need_closure = true;
7105 /* check for deprecated functions */
7106 if (warning.deprecated_declarations
7107 && is_declaration(entity)
7108 && entity->declaration.modifiers & DM_DEPRECATED) {
7109 declaration_t *declaration = &entity->declaration;
7111 char const *const prefix = entity->kind == ENTITY_FUNCTION ?
7112 "function" : "variable";
7114 if (declaration->deprecated_string != NULL) {
7115 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
7116 prefix, entity->base.symbol, &entity->base.source_position,
7117 declaration->deprecated_string);
7119 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
7120 entity->base.symbol, &entity->base.source_position);
7124 if (warning.init_self && entity == current_init_decl && !in_type_prop
7125 && entity->kind == ENTITY_VARIABLE) {
7126 current_init_decl = NULL;
7127 warningf(HERE, "variable '%#T' is initialized by itself",
7128 entity->declaration.type, entity->base.symbol);
7135 static bool semantic_cast(expression_t *cast)
7137 expression_t *expression = cast->unary.value;
7138 type_t *orig_dest_type = cast->base.type;
7139 type_t *orig_type_right = expression->base.type;
7140 type_t const *dst_type = skip_typeref(orig_dest_type);
7141 type_t const *src_type = skip_typeref(orig_type_right);
7142 source_position_t const *pos = &cast->base.source_position;
7144 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
7145 if (dst_type == type_void)
7148 /* only integer and pointer can be casted to pointer */
7149 if (is_type_pointer(dst_type) &&
7150 !is_type_pointer(src_type) &&
7151 !is_type_integer(src_type) &&
7152 is_type_valid(src_type)) {
7153 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
7157 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
7158 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
7162 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
7163 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
7167 if (warning.cast_qual &&
7168 is_type_pointer(src_type) &&
7169 is_type_pointer(dst_type)) {
7170 type_t *src = skip_typeref(src_type->pointer.points_to);
7171 type_t *dst = skip_typeref(dst_type->pointer.points_to);
7172 unsigned missing_qualifiers =
7173 src->base.qualifiers & ~dst->base.qualifiers;
7174 if (missing_qualifiers != 0) {
7176 "cast discards qualifiers '%Q' in pointer target type of '%T'",
7177 missing_qualifiers, orig_type_right);
7183 static expression_t *parse_compound_literal(type_t *type)
7185 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
7187 parse_initializer_env_t env;
7190 env.must_be_constant = false;
7191 initializer_t *initializer = parse_initializer(&env);
7194 expression->compound_literal.initializer = initializer;
7195 expression->compound_literal.type = type;
7196 expression->base.type = automatic_type_conversion(type);
7202 * Parse a cast expression.
7204 static expression_t *parse_cast(void)
7206 add_anchor_token(')');
7208 source_position_t source_position = token.source_position;
7210 type_t *type = parse_typename();
7212 rem_anchor_token(')');
7213 expect(')', end_error);
7215 if (token.type == '{') {
7216 return parse_compound_literal(type);
7219 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
7220 cast->base.source_position = source_position;
7222 expression_t *value = parse_sub_expression(PREC_CAST);
7223 cast->base.type = type;
7224 cast->unary.value = value;
7226 if (! semantic_cast(cast)) {
7227 /* TODO: record the error in the AST. else it is impossible to detect it */
7232 return create_invalid_expression();
7236 * Parse a statement expression.
7238 static expression_t *parse_statement_expression(void)
7240 add_anchor_token(')');
7242 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
7244 statement_t *statement = parse_compound_statement(true);
7245 statement->compound.stmt_expr = true;
7246 expression->statement.statement = statement;
7248 /* find last statement and use its type */
7249 type_t *type = type_void;
7250 const statement_t *stmt = statement->compound.statements;
7252 while (stmt->base.next != NULL)
7253 stmt = stmt->base.next;
7255 if (stmt->kind == STATEMENT_EXPRESSION) {
7256 type = stmt->expression.expression->base.type;
7258 } else if (warning.other) {
7259 warningf(&expression->base.source_position, "empty statement expression ({})");
7261 expression->base.type = type;
7263 rem_anchor_token(')');
7264 expect(')', end_error);
7271 * Parse a parenthesized expression.
7273 static expression_t *parse_parenthesized_expression(void)
7277 switch (token.type) {
7279 /* gcc extension: a statement expression */
7280 return parse_statement_expression();
7284 return parse_cast();
7286 if (is_typedef_symbol(token.v.symbol)) {
7287 return parse_cast();
7291 add_anchor_token(')');
7292 expression_t *result = parse_expression();
7293 result->base.parenthesized = true;
7294 rem_anchor_token(')');
7295 expect(')', end_error);
7301 static expression_t *parse_function_keyword(void)
7305 if (current_function == NULL) {
7306 errorf(HERE, "'__func__' used outside of a function");
7309 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7310 expression->base.type = type_char_ptr;
7311 expression->funcname.kind = FUNCNAME_FUNCTION;
7318 static expression_t *parse_pretty_function_keyword(void)
7320 if (current_function == NULL) {
7321 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
7324 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7325 expression->base.type = type_char_ptr;
7326 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
7328 eat(T___PRETTY_FUNCTION__);
7333 static expression_t *parse_funcsig_keyword(void)
7335 if (current_function == NULL) {
7336 errorf(HERE, "'__FUNCSIG__' used outside of a function");
7339 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7340 expression->base.type = type_char_ptr;
7341 expression->funcname.kind = FUNCNAME_FUNCSIG;
7348 static expression_t *parse_funcdname_keyword(void)
7350 if (current_function == NULL) {
7351 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
7354 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
7355 expression->base.type = type_char_ptr;
7356 expression->funcname.kind = FUNCNAME_FUNCDNAME;
7358 eat(T___FUNCDNAME__);
7363 static designator_t *parse_designator(void)
7365 designator_t *result = allocate_ast_zero(sizeof(result[0]));
7366 result->source_position = *HERE;
7368 if (token.type != T_IDENTIFIER) {
7369 parse_error_expected("while parsing member designator",
7370 T_IDENTIFIER, NULL);
7373 result->symbol = token.v.symbol;
7376 designator_t *last_designator = result;
7378 if (token.type == '.') {
7380 if (token.type != T_IDENTIFIER) {
7381 parse_error_expected("while parsing member designator",
7382 T_IDENTIFIER, NULL);
7385 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7386 designator->source_position = *HERE;
7387 designator->symbol = token.v.symbol;
7390 last_designator->next = designator;
7391 last_designator = designator;
7394 if (token.type == '[') {
7396 add_anchor_token(']');
7397 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
7398 designator->source_position = *HERE;
7399 designator->array_index = parse_expression();
7400 rem_anchor_token(']');
7401 expect(']', end_error);
7402 if (designator->array_index == NULL) {
7406 last_designator->next = designator;
7407 last_designator = designator;
7419 * Parse the __builtin_offsetof() expression.
7421 static expression_t *parse_offsetof(void)
7423 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
7424 expression->base.type = type_size_t;
7426 eat(T___builtin_offsetof);
7428 expect('(', end_error);
7429 add_anchor_token(',');
7430 type_t *type = parse_typename();
7431 rem_anchor_token(',');
7432 expect(',', end_error);
7433 add_anchor_token(')');
7434 designator_t *designator = parse_designator();
7435 rem_anchor_token(')');
7436 expect(')', end_error);
7438 expression->offsetofe.type = type;
7439 expression->offsetofe.designator = designator;
7442 memset(&path, 0, sizeof(path));
7443 path.top_type = type;
7444 path.path = NEW_ARR_F(type_path_entry_t, 0);
7446 descend_into_subtype(&path);
7448 if (!walk_designator(&path, designator, true)) {
7449 return create_invalid_expression();
7452 DEL_ARR_F(path.path);
7456 return create_invalid_expression();
7460 * Parses a _builtin_va_start() expression.
7462 static expression_t *parse_va_start(void)
7464 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
7466 eat(T___builtin_va_start);
7468 expect('(', end_error);
7469 add_anchor_token(',');
7470 expression->va_starte.ap = parse_assignment_expression();
7471 rem_anchor_token(',');
7472 expect(',', end_error);
7473 expression_t *const expr = parse_assignment_expression();
7474 if (expr->kind == EXPR_REFERENCE) {
7475 entity_t *const entity = expr->reference.entity;
7476 if (entity->base.parent_scope != ¤t_function->parameters
7477 || entity->base.next != NULL
7478 || entity->kind != ENTITY_PARAMETER) {
7479 errorf(&expr->base.source_position,
7480 "second argument of 'va_start' must be last parameter of the current function");
7482 expression->va_starte.parameter = &entity->variable;
7484 expect(')', end_error);
7487 expect(')', end_error);
7489 return create_invalid_expression();
7493 * Parses a _builtin_va_arg() expression.
7495 static expression_t *parse_va_arg(void)
7497 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7499 eat(T___builtin_va_arg);
7501 expect('(', end_error);
7502 expression->va_arge.ap = parse_assignment_expression();
7503 expect(',', end_error);
7504 expression->base.type = parse_typename();
7505 expect(')', end_error);
7509 return create_invalid_expression();
7512 static expression_t *parse_builtin_symbol(void)
7514 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
7516 symbol_t *symbol = token.v.symbol;
7518 expression->builtin_symbol.symbol = symbol;
7521 type_t *type = get_builtin_symbol_type(symbol);
7522 type = automatic_type_conversion(type);
7524 expression->base.type = type;
7529 * Parses a __builtin_constant() expression.
7531 static expression_t *parse_builtin_constant(void)
7533 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7535 eat(T___builtin_constant_p);
7537 expect('(', end_error);
7538 add_anchor_token(')');
7539 expression->builtin_constant.value = parse_assignment_expression();
7540 rem_anchor_token(')');
7541 expect(')', end_error);
7542 expression->base.type = type_int;
7546 return create_invalid_expression();
7550 * Parses a __builtin_prefetch() expression.
7552 static expression_t *parse_builtin_prefetch(void)
7554 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
7556 eat(T___builtin_prefetch);
7558 expect('(', end_error);
7559 add_anchor_token(')');
7560 expression->builtin_prefetch.adr = parse_assignment_expression();
7561 if (token.type == ',') {
7563 expression->builtin_prefetch.rw = parse_assignment_expression();
7565 if (token.type == ',') {
7567 expression->builtin_prefetch.locality = parse_assignment_expression();
7569 rem_anchor_token(')');
7570 expect(')', end_error);
7571 expression->base.type = type_void;
7575 return create_invalid_expression();
7579 * Parses a __builtin_is_*() compare expression.
7581 static expression_t *parse_compare_builtin(void)
7583 expression_t *expression;
7585 switch (token.type) {
7586 case T___builtin_isgreater:
7587 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7589 case T___builtin_isgreaterequal:
7590 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7592 case T___builtin_isless:
7593 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7595 case T___builtin_islessequal:
7596 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7598 case T___builtin_islessgreater:
7599 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7601 case T___builtin_isunordered:
7602 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7605 internal_errorf(HERE, "invalid compare builtin found");
7607 expression->base.source_position = *HERE;
7610 expect('(', end_error);
7611 expression->binary.left = parse_assignment_expression();
7612 expect(',', end_error);
7613 expression->binary.right = parse_assignment_expression();
7614 expect(')', end_error);
7616 type_t *const orig_type_left = expression->binary.left->base.type;
7617 type_t *const orig_type_right = expression->binary.right->base.type;
7619 type_t *const type_left = skip_typeref(orig_type_left);
7620 type_t *const type_right = skip_typeref(orig_type_right);
7621 if (!is_type_float(type_left) && !is_type_float(type_right)) {
7622 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7623 type_error_incompatible("invalid operands in comparison",
7624 &expression->base.source_position, orig_type_left, orig_type_right);
7627 semantic_comparison(&expression->binary);
7632 return create_invalid_expression();
7637 * Parses a __builtin_expect(, end_error) expression.
7639 static expression_t *parse_builtin_expect(void, end_error)
7641 expression_t *expression
7642 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
7644 eat(T___builtin_expect);
7646 expect('(', end_error);
7647 expression->binary.left = parse_assignment_expression();
7648 expect(',', end_error);
7649 expression->binary.right = parse_constant_expression();
7650 expect(')', end_error);
7652 expression->base.type = expression->binary.left->base.type;
7656 return create_invalid_expression();
7661 * Parses a MS assume() expression.
7663 static expression_t *parse_assume(void)
7665 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7669 expect('(', end_error);
7670 add_anchor_token(')');
7671 expression->unary.value = parse_assignment_expression();
7672 rem_anchor_token(')');
7673 expect(')', end_error);
7675 expression->base.type = type_void;
7678 return create_invalid_expression();
7682 * Return the declaration for a given label symbol or create a new one.
7684 * @param symbol the symbol of the label
7686 static label_t *get_label(symbol_t *symbol)
7689 assert(current_function != NULL);
7691 label = get_entity(symbol, NAMESPACE_LABEL);
7692 /* if we found a local label, we already created the declaration */
7693 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7694 if (label->base.parent_scope != current_scope) {
7695 assert(label->base.parent_scope->depth < current_scope->depth);
7696 current_function->goto_to_outer = true;
7698 return &label->label;
7701 label = get_entity(symbol, NAMESPACE_LABEL);
7702 /* if we found a label in the same function, then we already created the
7705 && label->base.parent_scope == ¤t_function->parameters) {
7706 return &label->label;
7709 /* otherwise we need to create a new one */
7710 label = allocate_entity_zero(ENTITY_LABEL);
7711 label->base.namespc = NAMESPACE_LABEL;
7712 label->base.symbol = symbol;
7716 return &label->label;
7720 * Parses a GNU && label address expression.
7722 static expression_t *parse_label_address(void)
7724 source_position_t source_position = token.source_position;
7726 if (token.type != T_IDENTIFIER) {
7727 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7730 symbol_t *symbol = token.v.symbol;
7733 label_t *label = get_label(symbol);
7735 label->address_taken = true;
7737 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7738 expression->base.source_position = source_position;
7740 /* label address is threaten as a void pointer */
7741 expression->base.type = type_void_ptr;
7742 expression->label_address.label = label;
7745 return create_invalid_expression();
7749 * Parse a microsoft __noop expression.
7751 static expression_t *parse_noop_expression(void)
7753 /* the result is a (int)0 */
7754 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
7755 cnst->base.type = type_int;
7756 cnst->conste.v.int_value = 0;
7757 cnst->conste.is_ms_noop = true;
7761 if (token.type == '(') {
7762 /* parse arguments */
7764 add_anchor_token(')');
7765 add_anchor_token(',');
7767 if (token.type != ')') {
7769 (void)parse_assignment_expression();
7770 if (token.type != ',')
7776 rem_anchor_token(',');
7777 rem_anchor_token(')');
7778 expect(')', end_error);
7785 * Parses a primary expression.
7787 static expression_t *parse_primary_expression(void)
7789 switch (token.type) {
7790 case T_false: return parse_bool_const(false);
7791 case T_true: return parse_bool_const(true);
7792 case T_INTEGER: return parse_int_const();
7793 case T_CHARACTER_CONSTANT: return parse_character_constant();
7794 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
7795 case T_FLOATINGPOINT: return parse_float_const();
7796 case T_STRING_LITERAL:
7797 case T_WIDE_STRING_LITERAL: return parse_string_const();
7798 case T_IDENTIFIER: return parse_reference();
7799 case T___FUNCTION__:
7800 case T___func__: return parse_function_keyword();
7801 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
7802 case T___FUNCSIG__: return parse_funcsig_keyword();
7803 case T___FUNCDNAME__: return parse_funcdname_keyword();
7804 case T___builtin_offsetof: return parse_offsetof();
7805 case T___builtin_va_start: return parse_va_start();
7806 case T___builtin_va_arg: return parse_va_arg();
7807 case T___builtin_expect:
7808 case T___builtin_alloca:
7809 case T___builtin_inf:
7810 case T___builtin_inff:
7811 case T___builtin_infl:
7812 case T___builtin_nan:
7813 case T___builtin_nanf:
7814 case T___builtin_nanl:
7815 case T___builtin_huge_val:
7816 case T___builtin_va_end:
7817 case T___builtin_return_address:
7818 case T___builtin_frame_address: return parse_builtin_symbol();
7819 case T___builtin_isgreater:
7820 case T___builtin_isgreaterequal:
7821 case T___builtin_isless:
7822 case T___builtin_islessequal:
7823 case T___builtin_islessgreater:
7824 case T___builtin_isunordered: return parse_compare_builtin();
7825 case T___builtin_constant_p: return parse_builtin_constant();
7826 case T___builtin_prefetch: return parse_builtin_prefetch();
7827 case T__assume: return parse_assume();
7830 return parse_label_address();
7833 case '(': return parse_parenthesized_expression();
7834 case T___noop: return parse_noop_expression();
7837 errorf(HERE, "unexpected token %K, expected an expression", &token);
7838 return create_invalid_expression();
7842 * Check if the expression has the character type and issue a warning then.
7844 static void check_for_char_index_type(const expression_t *expression)
7846 type_t *const type = expression->base.type;
7847 const type_t *const base_type = skip_typeref(type);
7849 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7850 warning.char_subscripts) {
7851 warningf(&expression->base.source_position,
7852 "array subscript has type '%T'", type);
7856 static expression_t *parse_array_expression(expression_t *left)
7858 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7861 add_anchor_token(']');
7863 expression_t *inside = parse_expression();
7865 type_t *const orig_type_left = left->base.type;
7866 type_t *const orig_type_inside = inside->base.type;
7868 type_t *const type_left = skip_typeref(orig_type_left);
7869 type_t *const type_inside = skip_typeref(orig_type_inside);
7871 type_t *return_type;
7872 array_access_expression_t *array_access = &expression->array_access;
7873 if (is_type_pointer(type_left)) {
7874 return_type = type_left->pointer.points_to;
7875 array_access->array_ref = left;
7876 array_access->index = inside;
7877 check_for_char_index_type(inside);
7878 } else if (is_type_pointer(type_inside)) {
7879 return_type = type_inside->pointer.points_to;
7880 array_access->array_ref = inside;
7881 array_access->index = left;
7882 array_access->flipped = true;
7883 check_for_char_index_type(left);
7885 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7887 "array access on object with non-pointer types '%T', '%T'",
7888 orig_type_left, orig_type_inside);
7890 return_type = type_error_type;
7891 array_access->array_ref = left;
7892 array_access->index = inside;
7895 expression->base.type = automatic_type_conversion(return_type);
7897 rem_anchor_token(']');
7898 expect(']', end_error);
7903 static expression_t *parse_typeprop(expression_kind_t const kind)
7905 expression_t *tp_expression = allocate_expression_zero(kind);
7906 tp_expression->base.type = type_size_t;
7908 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7910 /* we only refer to a type property, mark this case */
7911 bool old = in_type_prop;
7912 in_type_prop = true;
7915 expression_t *expression;
7916 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7918 add_anchor_token(')');
7919 orig_type = parse_typename();
7920 rem_anchor_token(')');
7921 expect(')', end_error);
7923 if (token.type == '{') {
7924 /* It was not sizeof(type) after all. It is sizeof of an expression
7925 * starting with a compound literal */
7926 expression = parse_compound_literal(orig_type);
7927 goto typeprop_expression;
7930 expression = parse_sub_expression(PREC_UNARY);
7932 typeprop_expression:
7933 tp_expression->typeprop.tp_expression = expression;
7935 orig_type = revert_automatic_type_conversion(expression);
7936 expression->base.type = orig_type;
7939 tp_expression->typeprop.type = orig_type;
7940 type_t const* const type = skip_typeref(orig_type);
7941 char const* const wrong_type =
7942 GNU_MODE && is_type_atomic(type, ATOMIC_TYPE_VOID) ? NULL :
7943 is_type_incomplete(type) ? "incomplete" :
7944 type->kind == TYPE_FUNCTION ? "function designator" :
7945 type->kind == TYPE_BITFIELD ? "bitfield" :
7947 if (wrong_type != NULL) {
7948 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7949 errorf(&tp_expression->base.source_position,
7950 "operand of %s expression must not be of %s type '%T'",
7951 what, wrong_type, orig_type);
7956 return tp_expression;
7959 static expression_t *parse_sizeof(void)
7961 return parse_typeprop(EXPR_SIZEOF);
7964 static expression_t *parse_alignof(void)
7966 return parse_typeprop(EXPR_ALIGNOF);
7969 static expression_t *parse_select_expression(expression_t *compound)
7971 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7972 select->select.compound = compound;
7974 assert(token.type == '.' || token.type == T_MINUSGREATER);
7975 bool is_pointer = (token.type == T_MINUSGREATER);
7978 if (token.type != T_IDENTIFIER) {
7979 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7982 symbol_t *symbol = token.v.symbol;
7985 type_t *const orig_type = compound->base.type;
7986 type_t *const type = skip_typeref(orig_type);
7989 bool saw_error = false;
7990 if (is_type_pointer(type)) {
7993 "request for member '%Y' in something not a struct or union, but '%T'",
7997 type_left = skip_typeref(type->pointer.points_to);
7999 if (is_pointer && is_type_valid(type)) {
8000 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
8007 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
8008 type_left->kind == TYPE_COMPOUND_UNION) {
8009 compound_t *compound = type_left->compound.compound;
8011 if (!compound->complete) {
8012 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
8014 goto create_error_entry;
8017 entry = find_compound_entry(compound, symbol);
8018 if (entry == NULL) {
8019 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
8020 goto create_error_entry;
8023 if (is_type_valid(type_left) && !saw_error) {
8025 "request for member '%Y' in something not a struct or union, but '%T'",
8029 entry = create_error_entity(symbol, ENTITY_COMPOUND_MEMBER);
8032 assert(is_declaration(entry));
8033 select->select.compound_entry = entry;
8035 type_t *entry_type = entry->declaration.type;
8037 = get_qualified_type(entry_type, type_left->base.qualifiers);
8039 /* we always do the auto-type conversions; the & and sizeof parser contains
8040 * code to revert this! */
8041 select->base.type = automatic_type_conversion(res_type);
8043 type_t *skipped = skip_typeref(res_type);
8044 if (skipped->kind == TYPE_BITFIELD) {
8045 select->base.type = skipped->bitfield.base_type;
8051 static void check_call_argument(const function_parameter_t *parameter,
8052 call_argument_t *argument, unsigned pos)
8054 type_t *expected_type = parameter->type;
8055 type_t *expected_type_skip = skip_typeref(expected_type);
8056 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
8057 expression_t *arg_expr = argument->expression;
8058 type_t *arg_type = skip_typeref(arg_expr->base.type);
8060 /* handle transparent union gnu extension */
8061 if (is_type_union(expected_type_skip)
8062 && (expected_type_skip->base.modifiers
8063 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
8064 compound_t *union_decl = expected_type_skip->compound.compound;
8065 type_t *best_type = NULL;
8066 entity_t *entry = union_decl->members.entities;
8067 for ( ; entry != NULL; entry = entry->base.next) {
8068 assert(is_declaration(entry));
8069 type_t *decl_type = entry->declaration.type;
8070 error = semantic_assign(decl_type, arg_expr);
8071 if (error == ASSIGN_ERROR_INCOMPATIBLE
8072 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
8075 if (error == ASSIGN_SUCCESS) {
8076 best_type = decl_type;
8077 } else if (best_type == NULL) {
8078 best_type = decl_type;
8082 if (best_type != NULL) {
8083 expected_type = best_type;
8087 error = semantic_assign(expected_type, arg_expr);
8088 argument->expression = create_implicit_cast(argument->expression,
8091 if (error != ASSIGN_SUCCESS) {
8092 /* report exact scope in error messages (like "in argument 3") */
8094 snprintf(buf, sizeof(buf), "call argument %u", pos);
8095 report_assign_error(error, expected_type, arg_expr, buf,
8096 &arg_expr->base.source_position);
8097 } else if (warning.traditional || warning.conversion) {
8098 type_t *const promoted_type = get_default_promoted_type(arg_type);
8099 if (!types_compatible(expected_type_skip, promoted_type) &&
8100 !types_compatible(expected_type_skip, type_void_ptr) &&
8101 !types_compatible(type_void_ptr, promoted_type)) {
8102 /* Deliberately show the skipped types in this warning */
8103 warningf(&arg_expr->base.source_position,
8104 "passing call argument %u as '%T' rather than '%T' due to prototype",
8105 pos, expected_type_skip, promoted_type);
8111 * Handle the semantic restrictions of builtin calls
8113 static void handle_builtin_argument_restrictions(call_expression_t *call) {
8114 switch (call->function->builtin_symbol.symbol->ID) {
8115 case T___builtin_return_address:
8116 case T___builtin_frame_address: {
8117 /* argument must be constant */
8118 call_argument_t *argument = call->arguments;
8120 if (! is_constant_expression(argument->expression)) {
8121 errorf(&call->base.source_position,
8122 "argument of '%Y' must be a constant expression",
8123 call->function->builtin_symbol.symbol);
8133 * Parse a call expression, ie. expression '( ... )'.
8135 * @param expression the function address
8137 static expression_t *parse_call_expression(expression_t *expression)
8139 expression_t *result = allocate_expression_zero(EXPR_CALL);
8140 call_expression_t *call = &result->call;
8141 call->function = expression;
8143 type_t *const orig_type = expression->base.type;
8144 type_t *const type = skip_typeref(orig_type);
8146 function_type_t *function_type = NULL;
8147 if (is_type_pointer(type)) {
8148 type_t *const to_type = skip_typeref(type->pointer.points_to);
8150 if (is_type_function(to_type)) {
8151 function_type = &to_type->function;
8152 call->base.type = function_type->return_type;
8156 if (function_type == NULL && is_type_valid(type)) {
8157 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
8160 /* parse arguments */
8162 add_anchor_token(')');
8163 add_anchor_token(',');
8165 if (token.type != ')') {
8166 call_argument_t *last_argument = NULL;
8169 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8171 argument->expression = parse_assignment_expression();
8172 if (last_argument == NULL) {
8173 call->arguments = argument;
8175 last_argument->next = argument;
8177 last_argument = argument;
8179 if (token.type != ',')
8184 rem_anchor_token(',');
8185 rem_anchor_token(')');
8186 expect(')', end_error);
8188 if (function_type == NULL)
8191 function_parameter_t *parameter = function_type->parameters;
8192 call_argument_t *argument = call->arguments;
8193 if (!function_type->unspecified_parameters) {
8194 for (unsigned pos = 0; parameter != NULL && argument != NULL;
8195 parameter = parameter->next, argument = argument->next) {
8196 check_call_argument(parameter, argument, ++pos);
8199 if (parameter != NULL) {
8200 errorf(HERE, "too few arguments to function '%E'", expression);
8201 } else if (argument != NULL && !function_type->variadic) {
8202 errorf(HERE, "too many arguments to function '%E'", expression);
8206 /* do default promotion */
8207 for (; argument != NULL; argument = argument->next) {
8208 type_t *type = argument->expression->base.type;
8210 type = get_default_promoted_type(type);
8212 argument->expression
8213 = create_implicit_cast(argument->expression, type);
8216 check_format(&result->call);
8218 if (warning.aggregate_return &&
8219 is_type_compound(skip_typeref(function_type->return_type))) {
8220 warningf(&result->base.source_position,
8221 "function call has aggregate value");
8224 if (call->function->kind == EXPR_BUILTIN_SYMBOL) {
8225 handle_builtin_argument_restrictions(&result->call);
8232 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
8234 static bool same_compound_type(const type_t *type1, const type_t *type2)
8237 is_type_compound(type1) &&
8238 type1->kind == type2->kind &&
8239 type1->compound.compound == type2->compound.compound;
8242 static expression_t const *get_reference_address(expression_t const *expr)
8244 bool regular_take_address = true;
8246 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8247 expr = expr->unary.value;
8249 regular_take_address = false;
8252 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8255 expr = expr->unary.value;
8258 if (expr->kind != EXPR_REFERENCE)
8261 /* special case for functions which are automatically converted to a
8262 * pointer to function without an extra TAKE_ADDRESS operation */
8263 if (!regular_take_address &&
8264 expr->reference.entity->kind != ENTITY_FUNCTION) {
8271 static void warn_reference_address_as_bool(expression_t const* expr)
8273 if (!warning.address)
8276 expr = get_reference_address(expr);
8278 warningf(&expr->base.source_position,
8279 "the address of '%Y' will always evaluate as 'true'",
8280 expr->reference.entity->base.symbol);
8284 static void warn_assignment_in_condition(const expression_t *const expr)
8286 if (!warning.parentheses)
8288 if (expr->base.kind != EXPR_BINARY_ASSIGN)
8290 if (expr->base.parenthesized)
8292 warningf(&expr->base.source_position,
8293 "suggest parentheses around assignment used as truth value");
8296 static void semantic_condition(expression_t const *const expr,
8297 char const *const context)
8299 type_t *const type = skip_typeref(expr->base.type);
8300 if (is_type_scalar(type)) {
8301 warn_reference_address_as_bool(expr);
8302 warn_assignment_in_condition(expr);
8303 } else if (is_type_valid(type)) {
8304 errorf(&expr->base.source_position,
8305 "%s must have scalar type", context);
8310 * Parse a conditional expression, ie. 'expression ? ... : ...'.
8312 * @param expression the conditional expression
8314 static expression_t *parse_conditional_expression(expression_t *expression)
8316 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
8318 conditional_expression_t *conditional = &result->conditional;
8319 conditional->condition = expression;
8322 add_anchor_token(':');
8324 /* §6.5.15:2 The first operand shall have scalar type. */
8325 semantic_condition(expression, "condition of conditional operator");
8327 expression_t *true_expression = expression;
8328 bool gnu_cond = false;
8329 if (GNU_MODE && token.type == ':') {
8332 true_expression = parse_expression();
8334 rem_anchor_token(':');
8335 expect(':', end_error);
8337 expression_t *false_expression =
8338 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
8340 type_t *const orig_true_type = true_expression->base.type;
8341 type_t *const orig_false_type = false_expression->base.type;
8342 type_t *const true_type = skip_typeref(orig_true_type);
8343 type_t *const false_type = skip_typeref(orig_false_type);
8346 type_t *result_type;
8347 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8348 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
8349 /* ISO/IEC 14882:1998(E) §5.16:2 */
8350 if (true_expression->kind == EXPR_UNARY_THROW) {
8351 result_type = false_type;
8352 } else if (false_expression->kind == EXPR_UNARY_THROW) {
8353 result_type = true_type;
8355 if (warning.other && (
8356 !is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
8357 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
8359 warningf(&conditional->base.source_position,
8360 "ISO C forbids conditional expression with only one void side");
8362 result_type = type_void;
8364 } else if (is_type_arithmetic(true_type)
8365 && is_type_arithmetic(false_type)) {
8366 result_type = semantic_arithmetic(true_type, false_type);
8368 true_expression = create_implicit_cast(true_expression, result_type);
8369 false_expression = create_implicit_cast(false_expression, result_type);
8371 conditional->true_expression = true_expression;
8372 conditional->false_expression = false_expression;
8373 conditional->base.type = result_type;
8374 } else if (same_compound_type(true_type, false_type)) {
8375 /* just take 1 of the 2 types */
8376 result_type = true_type;
8377 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
8378 type_t *pointer_type;
8380 expression_t *other_expression;
8381 if (is_type_pointer(true_type) &&
8382 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
8383 pointer_type = true_type;
8384 other_type = false_type;
8385 other_expression = false_expression;
8387 pointer_type = false_type;
8388 other_type = true_type;
8389 other_expression = true_expression;
8392 if (is_null_pointer_constant(other_expression)) {
8393 result_type = pointer_type;
8394 } else if (is_type_pointer(other_type)) {
8395 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
8396 type_t *to2 = skip_typeref(other_type->pointer.points_to);
8399 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
8400 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
8402 } else if (types_compatible(get_unqualified_type(to1),
8403 get_unqualified_type(to2))) {
8406 if (warning.other) {
8407 warningf(&conditional->base.source_position,
8408 "pointer types '%T' and '%T' in conditional expression are incompatible",
8409 true_type, false_type);
8414 type_t *const type =
8415 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
8416 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
8417 } else if (is_type_integer(other_type)) {
8418 if (warning.other) {
8419 warningf(&conditional->base.source_position,
8420 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
8422 result_type = pointer_type;
8424 if (is_type_valid(other_type)) {
8425 type_error_incompatible("while parsing conditional",
8426 &expression->base.source_position, true_type, false_type);
8428 result_type = type_error_type;
8431 if (is_type_valid(true_type) && is_type_valid(false_type)) {
8432 type_error_incompatible("while parsing conditional",
8433 &conditional->base.source_position, true_type,
8436 result_type = type_error_type;
8439 conditional->true_expression
8440 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
8441 conditional->false_expression
8442 = create_implicit_cast(false_expression, result_type);
8443 conditional->base.type = result_type;
8448 * Parse an extension expression.
8450 static expression_t *parse_extension(void)
8452 eat(T___extension__);
8454 bool old_gcc_extension = in_gcc_extension;
8455 in_gcc_extension = true;
8456 expression_t *expression = parse_sub_expression(PREC_UNARY);
8457 in_gcc_extension = old_gcc_extension;
8462 * Parse a __builtin_classify_type() expression.
8464 static expression_t *parse_builtin_classify_type(void)
8466 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
8467 result->base.type = type_int;
8469 eat(T___builtin_classify_type);
8471 expect('(', end_error);
8472 add_anchor_token(')');
8473 expression_t *expression = parse_expression();
8474 rem_anchor_token(')');
8475 expect(')', end_error);
8476 result->classify_type.type_expression = expression;
8480 return create_invalid_expression();
8484 * Parse a delete expression
8485 * ISO/IEC 14882:1998(E) §5.3.5
8487 static expression_t *parse_delete(void)
8489 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
8490 result->base.type = type_void;
8494 if (token.type == '[') {
8496 result->kind = EXPR_UNARY_DELETE_ARRAY;
8497 expect(']', end_error);
8501 expression_t *const value = parse_sub_expression(PREC_CAST);
8502 result->unary.value = value;
8504 type_t *const type = skip_typeref(value->base.type);
8505 if (!is_type_pointer(type)) {
8506 if (is_type_valid(type)) {
8507 errorf(&value->base.source_position,
8508 "operand of delete must have pointer type");
8510 } else if (warning.other &&
8511 is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8512 warningf(&value->base.source_position,
8513 "deleting 'void*' is undefined");
8520 * Parse a throw expression
8521 * ISO/IEC 14882:1998(E) §15:1
8523 static expression_t *parse_throw(void)
8525 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8526 result->base.type = type_void;
8530 expression_t *value = NULL;
8531 switch (token.type) {
8533 value = parse_assignment_expression();
8534 /* ISO/IEC 14882:1998(E) §15.1:3 */
8535 type_t *const orig_type = value->base.type;
8536 type_t *const type = skip_typeref(orig_type);
8537 if (is_type_incomplete(type)) {
8538 errorf(&value->base.source_position,
8539 "cannot throw object of incomplete type '%T'", orig_type);
8540 } else if (is_type_pointer(type)) {
8541 type_t *const points_to = skip_typeref(type->pointer.points_to);
8542 if (is_type_incomplete(points_to) &&
8543 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8544 errorf(&value->base.source_position,
8545 "cannot throw pointer to incomplete type '%T'", orig_type);
8553 result->unary.value = value;
8558 static bool check_pointer_arithmetic(const source_position_t *source_position,
8559 type_t *pointer_type,
8560 type_t *orig_pointer_type)
8562 type_t *points_to = pointer_type->pointer.points_to;
8563 points_to = skip_typeref(points_to);
8565 if (is_type_incomplete(points_to)) {
8566 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8567 errorf(source_position,
8568 "arithmetic with pointer to incomplete type '%T' not allowed",
8571 } else if (warning.pointer_arith) {
8572 warningf(source_position,
8573 "pointer of type '%T' used in arithmetic",
8576 } else if (is_type_function(points_to)) {
8578 errorf(source_position,
8579 "arithmetic with pointer to function type '%T' not allowed",
8582 } else if (warning.pointer_arith) {
8583 warningf(source_position,
8584 "pointer to a function '%T' used in arithmetic",
8591 static bool is_lvalue(const expression_t *expression)
8593 /* TODO: doesn't seem to be consistent with §6.3.2.1:1 */
8594 switch (expression->kind) {
8595 case EXPR_ARRAY_ACCESS:
8596 case EXPR_COMPOUND_LITERAL:
8597 case EXPR_REFERENCE:
8599 case EXPR_UNARY_DEREFERENCE:
8603 type_t *type = skip_typeref(expression->base.type);
8605 /* ISO/IEC 14882:1998(E) §3.10:3 */
8606 is_type_reference(type) ||
8607 /* Claim it is an lvalue, if the type is invalid. There was a parse
8608 * error before, which maybe prevented properly recognizing it as
8610 !is_type_valid(type);
8615 static void semantic_incdec(unary_expression_t *expression)
8617 type_t *const orig_type = expression->value->base.type;
8618 type_t *const type = skip_typeref(orig_type);
8619 if (is_type_pointer(type)) {
8620 if (!check_pointer_arithmetic(&expression->base.source_position,
8624 } else if (!is_type_real(type) && is_type_valid(type)) {
8625 /* TODO: improve error message */
8626 errorf(&expression->base.source_position,
8627 "operation needs an arithmetic or pointer type");
8630 if (!is_lvalue(expression->value)) {
8631 /* TODO: improve error message */
8632 errorf(&expression->base.source_position, "lvalue required as operand");
8634 expression->base.type = orig_type;
8637 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8639 type_t *const orig_type = expression->value->base.type;
8640 type_t *const type = skip_typeref(orig_type);
8641 if (!is_type_arithmetic(type)) {
8642 if (is_type_valid(type)) {
8643 /* TODO: improve error message */
8644 errorf(&expression->base.source_position,
8645 "operation needs an arithmetic type");
8650 expression->base.type = orig_type;
8653 static void semantic_unexpr_plus(unary_expression_t *expression)
8655 semantic_unexpr_arithmetic(expression);
8656 if (warning.traditional)
8657 warningf(&expression->base.source_position,
8658 "traditional C rejects the unary plus operator");
8661 static void semantic_not(unary_expression_t *expression)
8663 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
8664 semantic_condition(expression->value, "operand of !");
8665 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8668 static void semantic_unexpr_integer(unary_expression_t *expression)
8670 type_t *const orig_type = expression->value->base.type;
8671 type_t *const type = skip_typeref(orig_type);
8672 if (!is_type_integer(type)) {
8673 if (is_type_valid(type)) {
8674 errorf(&expression->base.source_position,
8675 "operand of ~ must be of integer type");
8680 expression->base.type = orig_type;
8683 static void semantic_dereference(unary_expression_t *expression)
8685 type_t *const orig_type = expression->value->base.type;
8686 type_t *const type = skip_typeref(orig_type);
8687 if (!is_type_pointer(type)) {
8688 if (is_type_valid(type)) {
8689 errorf(&expression->base.source_position,
8690 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8695 type_t *result_type = type->pointer.points_to;
8696 result_type = automatic_type_conversion(result_type);
8697 expression->base.type = result_type;
8701 * Record that an address is taken (expression represents an lvalue).
8703 * @param expression the expression
8704 * @param may_be_register if true, the expression might be an register
8706 static void set_address_taken(expression_t *expression, bool may_be_register)
8708 if (expression->kind != EXPR_REFERENCE)
8711 entity_t *const entity = expression->reference.entity;
8713 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8716 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8717 && !may_be_register) {
8718 errorf(&expression->base.source_position,
8719 "address of register %s '%Y' requested",
8720 get_entity_kind_name(entity->kind), entity->base.symbol);
8723 if (entity->kind == ENTITY_VARIABLE) {
8724 entity->variable.address_taken = true;
8726 assert(entity->kind == ENTITY_PARAMETER);
8727 entity->parameter.address_taken = true;
8732 * Check the semantic of the address taken expression.
8734 static void semantic_take_addr(unary_expression_t *expression)
8736 expression_t *value = expression->value;
8737 value->base.type = revert_automatic_type_conversion(value);
8739 type_t *orig_type = value->base.type;
8740 type_t *type = skip_typeref(orig_type);
8741 if (!is_type_valid(type))
8745 if (!is_lvalue(value)) {
8746 errorf(&expression->base.source_position, "'&' requires an lvalue");
8748 if (type->kind == TYPE_BITFIELD) {
8749 errorf(&expression->base.source_position,
8750 "'&' not allowed on object with bitfield type '%T'",
8754 set_address_taken(value, false);
8756 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8759 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8760 static expression_t *parse_##unexpression_type(void) \
8762 expression_t *unary_expression \
8763 = allocate_expression_zero(unexpression_type); \
8765 unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \
8767 sfunc(&unary_expression->unary); \
8769 return unary_expression; \
8772 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8773 semantic_unexpr_arithmetic)
8774 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8775 semantic_unexpr_plus)
8776 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8778 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8779 semantic_dereference)
8780 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8782 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8783 semantic_unexpr_integer)
8784 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
8786 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8789 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8791 static expression_t *parse_##unexpression_type(expression_t *left) \
8793 expression_t *unary_expression \
8794 = allocate_expression_zero(unexpression_type); \
8796 unary_expression->unary.value = left; \
8798 sfunc(&unary_expression->unary); \
8800 return unary_expression; \
8803 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8804 EXPR_UNARY_POSTFIX_INCREMENT,
8806 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8807 EXPR_UNARY_POSTFIX_DECREMENT,
8810 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8812 /* TODO: handle complex + imaginary types */
8814 type_left = get_unqualified_type(type_left);
8815 type_right = get_unqualified_type(type_right);
8817 /* § 6.3.1.8 Usual arithmetic conversions */
8818 if (type_left == type_long_double || type_right == type_long_double) {
8819 return type_long_double;
8820 } else if (type_left == type_double || type_right == type_double) {
8822 } else if (type_left == type_float || type_right == type_float) {
8826 type_left = promote_integer(type_left);
8827 type_right = promote_integer(type_right);
8829 if (type_left == type_right)
8832 bool const signed_left = is_type_signed(type_left);
8833 bool const signed_right = is_type_signed(type_right);
8834 int const rank_left = get_rank(type_left);
8835 int const rank_right = get_rank(type_right);
8837 if (signed_left == signed_right)
8838 return rank_left >= rank_right ? type_left : type_right;
8847 u_rank = rank_right;
8848 u_type = type_right;
8850 s_rank = rank_right;
8851 s_type = type_right;
8856 if (u_rank >= s_rank)
8859 /* casting rank to atomic_type_kind is a bit hacky, but makes things
8861 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8862 > get_atomic_type_size((atomic_type_kind_t) u_rank))
8866 case ATOMIC_TYPE_INT: return type_unsigned_int;
8867 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8868 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8870 default: panic("invalid atomic type");
8875 * Check the semantic restrictions for a binary expression.
8877 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8879 expression_t *const left = expression->left;
8880 expression_t *const right = expression->right;
8881 type_t *const orig_type_left = left->base.type;
8882 type_t *const orig_type_right = right->base.type;
8883 type_t *const type_left = skip_typeref(orig_type_left);
8884 type_t *const type_right = skip_typeref(orig_type_right);
8886 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8887 /* TODO: improve error message */
8888 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8889 errorf(&expression->base.source_position,
8890 "operation needs arithmetic types");
8895 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8896 expression->left = create_implicit_cast(left, arithmetic_type);
8897 expression->right = create_implicit_cast(right, arithmetic_type);
8898 expression->base.type = arithmetic_type;
8901 static void warn_div_by_zero(binary_expression_t const *const expression)
8903 if (!warning.div_by_zero ||
8904 !is_type_integer(expression->base.type))
8907 expression_t const *const right = expression->right;
8908 /* The type of the right operand can be different for /= */
8909 if (is_type_integer(right->base.type) &&
8910 is_constant_expression(right) &&
8911 fold_constant(right) == 0) {
8912 warningf(&expression->base.source_position, "division by zero");
8917 * Check the semantic restrictions for a div/mod expression.
8919 static void semantic_divmod_arithmetic(binary_expression_t *expression)
8921 semantic_binexpr_arithmetic(expression);
8922 warn_div_by_zero(expression);
8925 static void warn_addsub_in_shift(const expression_t *const expr)
8927 if (expr->base.parenthesized)
8931 switch (expr->kind) {
8932 case EXPR_BINARY_ADD: op = '+'; break;
8933 case EXPR_BINARY_SUB: op = '-'; break;
8937 warningf(&expr->base.source_position,
8938 "suggest parentheses around '%c' inside shift", op);
8941 static void semantic_shift_op(binary_expression_t *expression)
8943 expression_t *const left = expression->left;
8944 expression_t *const right = expression->right;
8945 type_t *const orig_type_left = left->base.type;
8946 type_t *const orig_type_right = right->base.type;
8947 type_t * type_left = skip_typeref(orig_type_left);
8948 type_t * type_right = skip_typeref(orig_type_right);
8950 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8951 /* TODO: improve error message */
8952 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8953 errorf(&expression->base.source_position,
8954 "operands of shift operation must have integer types");
8959 if (warning.parentheses) {
8960 warn_addsub_in_shift(left);
8961 warn_addsub_in_shift(right);
8964 type_left = promote_integer(type_left);
8965 type_right = promote_integer(type_right);
8967 expression->left = create_implicit_cast(left, type_left);
8968 expression->right = create_implicit_cast(right, type_right);
8969 expression->base.type = type_left;
8972 static void semantic_add(binary_expression_t *expression)
8974 expression_t *const left = expression->left;
8975 expression_t *const right = expression->right;
8976 type_t *const orig_type_left = left->base.type;
8977 type_t *const orig_type_right = right->base.type;
8978 type_t *const type_left = skip_typeref(orig_type_left);
8979 type_t *const type_right = skip_typeref(orig_type_right);
8982 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8983 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8984 expression->left = create_implicit_cast(left, arithmetic_type);
8985 expression->right = create_implicit_cast(right, arithmetic_type);
8986 expression->base.type = arithmetic_type;
8987 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8988 check_pointer_arithmetic(&expression->base.source_position,
8989 type_left, orig_type_left);
8990 expression->base.type = type_left;
8991 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8992 check_pointer_arithmetic(&expression->base.source_position,
8993 type_right, orig_type_right);
8994 expression->base.type = type_right;
8995 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8996 errorf(&expression->base.source_position,
8997 "invalid operands to binary + ('%T', '%T')",
8998 orig_type_left, orig_type_right);
9002 static void semantic_sub(binary_expression_t *expression)
9004 expression_t *const left = expression->left;
9005 expression_t *const right = expression->right;
9006 type_t *const orig_type_left = left->base.type;
9007 type_t *const orig_type_right = right->base.type;
9008 type_t *const type_left = skip_typeref(orig_type_left);
9009 type_t *const type_right = skip_typeref(orig_type_right);
9010 source_position_t const *const pos = &expression->base.source_position;
9013 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9014 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9015 expression->left = create_implicit_cast(left, arithmetic_type);
9016 expression->right = create_implicit_cast(right, arithmetic_type);
9017 expression->base.type = arithmetic_type;
9018 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9019 check_pointer_arithmetic(&expression->base.source_position,
9020 type_left, orig_type_left);
9021 expression->base.type = type_left;
9022 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
9023 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
9024 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
9025 if (!types_compatible(unqual_left, unqual_right)) {
9027 "subtracting pointers to incompatible types '%T' and '%T'",
9028 orig_type_left, orig_type_right);
9029 } else if (!is_type_object(unqual_left)) {
9030 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
9031 errorf(pos, "subtracting pointers to non-object types '%T'",
9033 } else if (warning.other) {
9034 warningf(pos, "subtracting pointers to void");
9037 expression->base.type = type_ptrdiff_t;
9038 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9039 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
9040 orig_type_left, orig_type_right);
9044 static void warn_string_literal_address(expression_t const* expr)
9046 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
9047 expr = expr->unary.value;
9048 if (expr->kind != EXPR_UNARY_DEREFERENCE)
9050 expr = expr->unary.value;
9053 if (expr->kind == EXPR_STRING_LITERAL ||
9054 expr->kind == EXPR_WIDE_STRING_LITERAL) {
9055 warningf(&expr->base.source_position,
9056 "comparison with string literal results in unspecified behaviour");
9060 static void warn_comparison_in_comparison(const expression_t *const expr)
9062 if (expr->base.parenthesized)
9064 switch (expr->base.kind) {
9065 case EXPR_BINARY_LESS:
9066 case EXPR_BINARY_GREATER:
9067 case EXPR_BINARY_LESSEQUAL:
9068 case EXPR_BINARY_GREATEREQUAL:
9069 case EXPR_BINARY_NOTEQUAL:
9070 case EXPR_BINARY_EQUAL:
9071 warningf(&expr->base.source_position,
9072 "comparisons like 'x <= y < z' do not have their mathematical meaning");
9079 static bool maybe_negative(expression_t const *const expr)
9082 !is_constant_expression(expr) ||
9083 fold_constant(expr) < 0;
9087 * Check the semantics of comparison expressions.
9089 * @param expression The expression to check.
9091 static void semantic_comparison(binary_expression_t *expression)
9093 expression_t *left = expression->left;
9094 expression_t *right = expression->right;
9096 if (warning.address) {
9097 warn_string_literal_address(left);
9098 warn_string_literal_address(right);
9100 expression_t const* const func_left = get_reference_address(left);
9101 if (func_left != NULL && is_null_pointer_constant(right)) {
9102 warningf(&expression->base.source_position,
9103 "the address of '%Y' will never be NULL",
9104 func_left->reference.entity->base.symbol);
9107 expression_t const* const func_right = get_reference_address(right);
9108 if (func_right != NULL && is_null_pointer_constant(right)) {
9109 warningf(&expression->base.source_position,
9110 "the address of '%Y' will never be NULL",
9111 func_right->reference.entity->base.symbol);
9115 if (warning.parentheses) {
9116 warn_comparison_in_comparison(left);
9117 warn_comparison_in_comparison(right);
9120 type_t *orig_type_left = left->base.type;
9121 type_t *orig_type_right = right->base.type;
9122 type_t *type_left = skip_typeref(orig_type_left);
9123 type_t *type_right = skip_typeref(orig_type_right);
9125 /* TODO non-arithmetic types */
9126 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9127 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9129 /* test for signed vs unsigned compares */
9130 if (warning.sign_compare && is_type_integer(arithmetic_type)) {
9131 bool const signed_left = is_type_signed(type_left);
9132 bool const signed_right = is_type_signed(type_right);
9133 if (signed_left != signed_right) {
9134 /* FIXME long long needs better const folding magic */
9135 /* TODO check whether constant value can be represented by other type */
9136 if ((signed_left && maybe_negative(left)) ||
9137 (signed_right && maybe_negative(right))) {
9138 warningf(&expression->base.source_position,
9139 "comparison between signed and unsigned");
9144 expression->left = create_implicit_cast(left, arithmetic_type);
9145 expression->right = create_implicit_cast(right, arithmetic_type);
9146 expression->base.type = arithmetic_type;
9147 if (warning.float_equal &&
9148 (expression->base.kind == EXPR_BINARY_EQUAL ||
9149 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
9150 is_type_float(arithmetic_type)) {
9151 warningf(&expression->base.source_position,
9152 "comparing floating point with == or != is unsafe");
9154 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
9155 /* TODO check compatibility */
9156 } else if (is_type_pointer(type_left)) {
9157 expression->right = create_implicit_cast(right, type_left);
9158 } else if (is_type_pointer(type_right)) {
9159 expression->left = create_implicit_cast(left, type_right);
9160 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9161 type_error_incompatible("invalid operands in comparison",
9162 &expression->base.source_position,
9163 type_left, type_right);
9165 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9169 * Checks if a compound type has constant fields.
9171 static bool has_const_fields(const compound_type_t *type)
9173 compound_t *compound = type->compound;
9174 entity_t *entry = compound->members.entities;
9176 for (; entry != NULL; entry = entry->base.next) {
9177 if (!is_declaration(entry))
9180 const type_t *decl_type = skip_typeref(entry->declaration.type);
9181 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
9188 static bool is_valid_assignment_lhs(expression_t const* const left)
9190 type_t *const orig_type_left = revert_automatic_type_conversion(left);
9191 type_t *const type_left = skip_typeref(orig_type_left);
9193 if (!is_lvalue(left)) {
9194 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
9199 if (left->kind == EXPR_REFERENCE
9200 && left->reference.entity->kind == ENTITY_FUNCTION) {
9201 errorf(HERE, "cannot assign to function '%E'", left);
9205 if (is_type_array(type_left)) {
9206 errorf(HERE, "cannot assign to array '%E'", left);
9209 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
9210 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
9214 if (is_type_incomplete(type_left)) {
9215 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
9216 left, orig_type_left);
9219 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
9220 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
9221 left, orig_type_left);
9228 static void semantic_arithmetic_assign(binary_expression_t *expression)
9230 expression_t *left = expression->left;
9231 expression_t *right = expression->right;
9232 type_t *orig_type_left = left->base.type;
9233 type_t *orig_type_right = right->base.type;
9235 if (!is_valid_assignment_lhs(left))
9238 type_t *type_left = skip_typeref(orig_type_left);
9239 type_t *type_right = skip_typeref(orig_type_right);
9241 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
9242 /* TODO: improve error message */
9243 if (is_type_valid(type_left) && is_type_valid(type_right)) {
9244 errorf(&expression->base.source_position,
9245 "operation needs arithmetic types");
9250 /* combined instructions are tricky. We can't create an implicit cast on
9251 * the left side, because we need the uncasted form for the store.
9252 * The ast2firm pass has to know that left_type must be right_type
9253 * for the arithmetic operation and create a cast by itself */
9254 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
9255 expression->right = create_implicit_cast(right, arithmetic_type);
9256 expression->base.type = type_left;
9259 static void semantic_divmod_assign(binary_expression_t *expression)
9261 semantic_arithmetic_assign(expression);
9262 warn_div_by_zero(expression);
9265 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
9267 expression_t *const left = expression->left;
9268 expression_t *const right = expression->right;
9269 type_t *const orig_type_left = left->base.type;
9270 type_t *const orig_type_right = right->base.type;
9271 type_t *const type_left = skip_typeref(orig_type_left);
9272 type_t *const type_right = skip_typeref(orig_type_right);
9274 if (!is_valid_assignment_lhs(left))
9277 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
9278 /* combined instructions are tricky. We can't create an implicit cast on
9279 * the left side, because we need the uncasted form for the store.
9280 * The ast2firm pass has to know that left_type must be right_type
9281 * for the arithmetic operation and create a cast by itself */
9282 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
9283 expression->right = create_implicit_cast(right, arithmetic_type);
9284 expression->base.type = type_left;
9285 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
9286 check_pointer_arithmetic(&expression->base.source_position,
9287 type_left, orig_type_left);
9288 expression->base.type = type_left;
9289 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
9290 errorf(&expression->base.source_position,
9291 "incompatible types '%T' and '%T' in assignment",
9292 orig_type_left, orig_type_right);
9296 static void warn_logical_and_within_or(const expression_t *const expr)
9298 if (expr->base.kind != EXPR_BINARY_LOGICAL_AND)
9300 if (expr->base.parenthesized)
9302 warningf(&expr->base.source_position,
9303 "suggest parentheses around && within ||");
9307 * Check the semantic restrictions of a logical expression.
9309 static void semantic_logical_op(binary_expression_t *expression)
9311 /* §6.5.13:2 Each of the operands shall have scalar type.
9312 * §6.5.14:2 Each of the operands shall have scalar type. */
9313 semantic_condition(expression->left, "left operand of logical operator");
9314 semantic_condition(expression->right, "right operand of logical operator");
9315 if (expression->base.kind == EXPR_BINARY_LOGICAL_OR &&
9316 warning.parentheses) {
9317 warn_logical_and_within_or(expression->left);
9318 warn_logical_and_within_or(expression->right);
9320 expression->base.type = c_mode & _CXX ? type_bool : type_int;
9324 * Check the semantic restrictions of a binary assign expression.
9326 static void semantic_binexpr_assign(binary_expression_t *expression)
9328 expression_t *left = expression->left;
9329 type_t *orig_type_left = left->base.type;
9331 if (!is_valid_assignment_lhs(left))
9334 assign_error_t error = semantic_assign(orig_type_left, expression->right);
9335 report_assign_error(error, orig_type_left, expression->right,
9336 "assignment", &left->base.source_position);
9337 expression->right = create_implicit_cast(expression->right, orig_type_left);
9338 expression->base.type = orig_type_left;
9342 * Determine if the outermost operation (or parts thereof) of the given
9343 * expression has no effect in order to generate a warning about this fact.
9344 * Therefore in some cases this only examines some of the operands of the
9345 * expression (see comments in the function and examples below).
9347 * f() + 23; // warning, because + has no effect
9348 * x || f(); // no warning, because x controls execution of f()
9349 * x ? y : f(); // warning, because y has no effect
9350 * (void)x; // no warning to be able to suppress the warning
9351 * This function can NOT be used for an "expression has definitely no effect"-
9353 static bool expression_has_effect(const expression_t *const expr)
9355 switch (expr->kind) {
9356 case EXPR_UNKNOWN: break;
9357 case EXPR_INVALID: return true; /* do NOT warn */
9358 case EXPR_REFERENCE: return false;
9359 case EXPR_REFERENCE_ENUM_VALUE: return false;
9360 /* suppress the warning for microsoft __noop operations */
9361 case EXPR_CONST: return expr->conste.is_ms_noop;
9362 case EXPR_CHARACTER_CONSTANT: return false;
9363 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
9364 case EXPR_STRING_LITERAL: return false;
9365 case EXPR_WIDE_STRING_LITERAL: return false;
9366 case EXPR_LABEL_ADDRESS: return false;
9369 const call_expression_t *const call = &expr->call;
9370 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
9373 switch (call->function->builtin_symbol.symbol->ID) {
9374 case T___builtin_va_end: return true;
9375 default: return false;
9379 /* Generate the warning if either the left or right hand side of a
9380 * conditional expression has no effect */
9381 case EXPR_CONDITIONAL: {
9382 conditional_expression_t const *const cond = &expr->conditional;
9383 expression_t const *const t = cond->true_expression;
9385 (t == NULL || expression_has_effect(t)) &&
9386 expression_has_effect(cond->false_expression);
9389 case EXPR_SELECT: return false;
9390 case EXPR_ARRAY_ACCESS: return false;
9391 case EXPR_SIZEOF: return false;
9392 case EXPR_CLASSIFY_TYPE: return false;
9393 case EXPR_ALIGNOF: return false;
9395 case EXPR_FUNCNAME: return false;
9396 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
9397 case EXPR_BUILTIN_CONSTANT_P: return false;
9398 case EXPR_BUILTIN_PREFETCH: return true;
9399 case EXPR_OFFSETOF: return false;
9400 case EXPR_VA_START: return true;
9401 case EXPR_VA_ARG: return true;
9402 case EXPR_STATEMENT: return true; // TODO
9403 case EXPR_COMPOUND_LITERAL: return false;
9405 case EXPR_UNARY_NEGATE: return false;
9406 case EXPR_UNARY_PLUS: return false;
9407 case EXPR_UNARY_BITWISE_NEGATE: return false;
9408 case EXPR_UNARY_NOT: return false;
9409 case EXPR_UNARY_DEREFERENCE: return false;
9410 case EXPR_UNARY_TAKE_ADDRESS: return false;
9411 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
9412 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
9413 case EXPR_UNARY_PREFIX_INCREMENT: return true;
9414 case EXPR_UNARY_PREFIX_DECREMENT: return true;
9416 /* Treat void casts as if they have an effect in order to being able to
9417 * suppress the warning */
9418 case EXPR_UNARY_CAST: {
9419 type_t *const type = skip_typeref(expr->base.type);
9420 return is_type_atomic(type, ATOMIC_TYPE_VOID);
9423 case EXPR_UNARY_CAST_IMPLICIT: return true;
9424 case EXPR_UNARY_ASSUME: return true;
9425 case EXPR_UNARY_DELETE: return true;
9426 case EXPR_UNARY_DELETE_ARRAY: return true;
9427 case EXPR_UNARY_THROW: return true;
9429 case EXPR_BINARY_ADD: return false;
9430 case EXPR_BINARY_SUB: return false;
9431 case EXPR_BINARY_MUL: return false;
9432 case EXPR_BINARY_DIV: return false;
9433 case EXPR_BINARY_MOD: return false;
9434 case EXPR_BINARY_EQUAL: return false;
9435 case EXPR_BINARY_NOTEQUAL: return false;
9436 case EXPR_BINARY_LESS: return false;
9437 case EXPR_BINARY_LESSEQUAL: return false;
9438 case EXPR_BINARY_GREATER: return false;
9439 case EXPR_BINARY_GREATEREQUAL: return false;
9440 case EXPR_BINARY_BITWISE_AND: return false;
9441 case EXPR_BINARY_BITWISE_OR: return false;
9442 case EXPR_BINARY_BITWISE_XOR: return false;
9443 case EXPR_BINARY_SHIFTLEFT: return false;
9444 case EXPR_BINARY_SHIFTRIGHT: return false;
9445 case EXPR_BINARY_ASSIGN: return true;
9446 case EXPR_BINARY_MUL_ASSIGN: return true;
9447 case EXPR_BINARY_DIV_ASSIGN: return true;
9448 case EXPR_BINARY_MOD_ASSIGN: return true;
9449 case EXPR_BINARY_ADD_ASSIGN: return true;
9450 case EXPR_BINARY_SUB_ASSIGN: return true;
9451 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
9452 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
9453 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
9454 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
9455 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
9457 /* Only examine the right hand side of && and ||, because the left hand
9458 * side already has the effect of controlling the execution of the right
9460 case EXPR_BINARY_LOGICAL_AND:
9461 case EXPR_BINARY_LOGICAL_OR:
9462 /* Only examine the right hand side of a comma expression, because the left
9463 * hand side has a separate warning */
9464 case EXPR_BINARY_COMMA:
9465 return expression_has_effect(expr->binary.right);
9467 case EXPR_BINARY_ISGREATER: return false;
9468 case EXPR_BINARY_ISGREATEREQUAL: return false;
9469 case EXPR_BINARY_ISLESS: return false;
9470 case EXPR_BINARY_ISLESSEQUAL: return false;
9471 case EXPR_BINARY_ISLESSGREATER: return false;
9472 case EXPR_BINARY_ISUNORDERED: return false;
9475 internal_errorf(HERE, "unexpected expression");
9478 static void semantic_comma(binary_expression_t *expression)
9480 if (warning.unused_value) {
9481 const expression_t *const left = expression->left;
9482 if (!expression_has_effect(left)) {
9483 warningf(&left->base.source_position,
9484 "left-hand operand of comma expression has no effect");
9487 expression->base.type = expression->right->base.type;
9491 * @param prec_r precedence of the right operand
9493 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9494 static expression_t *parse_##binexpression_type(expression_t *left) \
9496 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
9497 binexpr->binary.left = left; \
9500 expression_t *right = parse_sub_expression(prec_r); \
9502 binexpr->binary.right = right; \
9503 sfunc(&binexpr->binary); \
9508 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
9509 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
9510 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
9511 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
9512 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
9513 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
9514 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
9515 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
9516 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
9517 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
9518 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
9519 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
9520 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
9521 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic)
9522 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic)
9523 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic)
9524 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
9525 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
9526 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
9527 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9528 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
9529 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9530 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9531 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
9532 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9533 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9534 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9535 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9536 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
9537 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
9540 static expression_t *parse_sub_expression(precedence_t precedence)
9542 if (token.type < 0) {
9543 return expected_expression_error();
9546 expression_parser_function_t *parser
9547 = &expression_parsers[token.type];
9548 source_position_t source_position = token.source_position;
9551 if (parser->parser != NULL) {
9552 left = parser->parser();
9554 left = parse_primary_expression();
9556 assert(left != NULL);
9557 left->base.source_position = source_position;
9560 if (token.type < 0) {
9561 return expected_expression_error();
9564 parser = &expression_parsers[token.type];
9565 if (parser->infix_parser == NULL)
9567 if (parser->infix_precedence < precedence)
9570 left = parser->infix_parser(left);
9572 assert(left != NULL);
9573 assert(left->kind != EXPR_UNKNOWN);
9574 left->base.source_position = source_position;
9581 * Parse an expression.
9583 static expression_t *parse_expression(void)
9585 return parse_sub_expression(PREC_EXPRESSION);
9589 * Register a parser for a prefix-like operator.
9591 * @param parser the parser function
9592 * @param token_type the token type of the prefix token
9594 static void register_expression_parser(parse_expression_function parser,
9597 expression_parser_function_t *entry = &expression_parsers[token_type];
9599 if (entry->parser != NULL) {
9600 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9601 panic("trying to register multiple expression parsers for a token");
9603 entry->parser = parser;
9607 * Register a parser for an infix operator with given precedence.
9609 * @param parser the parser function
9610 * @param token_type the token type of the infix operator
9611 * @param precedence the precedence of the operator
9613 static void register_infix_parser(parse_expression_infix_function parser,
9614 int token_type, precedence_t precedence)
9616 expression_parser_function_t *entry = &expression_parsers[token_type];
9618 if (entry->infix_parser != NULL) {
9619 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9620 panic("trying to register multiple infix expression parsers for a "
9623 entry->infix_parser = parser;
9624 entry->infix_precedence = precedence;
9628 * Initialize the expression parsers.
9630 static void init_expression_parsers(void)
9632 memset(&expression_parsers, 0, sizeof(expression_parsers));
9634 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
9635 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
9636 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
9637 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
9638 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
9639 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
9640 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
9641 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
9642 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
9643 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
9644 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
9645 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
9646 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
9647 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
9648 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
9649 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
9650 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
9651 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
9652 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9653 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
9654 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
9655 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
9656 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
9657 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
9658 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
9659 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
9660 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
9661 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
9662 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
9663 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
9664 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
9665 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
9666 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
9667 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
9668 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
9669 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
9670 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
9672 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
9673 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
9674 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
9675 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
9676 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
9677 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
9678 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9679 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9680 register_expression_parser(parse_sizeof, T_sizeof);
9681 register_expression_parser(parse_alignof, T___alignof__);
9682 register_expression_parser(parse_extension, T___extension__);
9683 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
9684 register_expression_parser(parse_delete, T_delete);
9685 register_expression_parser(parse_throw, T_throw);
9689 * Parse a asm statement arguments specification.
9691 static asm_argument_t *parse_asm_arguments(bool is_out)
9693 asm_argument_t *result = NULL;
9694 asm_argument_t **anchor = &result;
9696 while (token.type == T_STRING_LITERAL || token.type == '[') {
9697 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9698 memset(argument, 0, sizeof(argument[0]));
9700 if (token.type == '[') {
9702 if (token.type != T_IDENTIFIER) {
9703 parse_error_expected("while parsing asm argument",
9704 T_IDENTIFIER, NULL);
9707 argument->symbol = token.v.symbol;
9709 expect(']', end_error);
9712 argument->constraints = parse_string_literals();
9713 expect('(', end_error);
9714 add_anchor_token(')');
9715 expression_t *expression = parse_expression();
9716 rem_anchor_token(')');
9718 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
9719 * change size or type representation (e.g. int -> long is ok, but
9720 * int -> float is not) */
9721 if (expression->kind == EXPR_UNARY_CAST) {
9722 type_t *const type = expression->base.type;
9723 type_kind_t const kind = type->kind;
9724 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9727 if (kind == TYPE_ATOMIC) {
9728 atomic_type_kind_t const akind = type->atomic.akind;
9729 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9730 size = get_atomic_type_size(akind);
9732 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9733 size = get_atomic_type_size(get_intptr_kind());
9737 expression_t *const value = expression->unary.value;
9738 type_t *const value_type = value->base.type;
9739 type_kind_t const value_kind = value_type->kind;
9741 unsigned value_flags;
9742 unsigned value_size;
9743 if (value_kind == TYPE_ATOMIC) {
9744 atomic_type_kind_t const value_akind = value_type->atomic.akind;
9745 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9746 value_size = get_atomic_type_size(value_akind);
9747 } else if (value_kind == TYPE_POINTER) {
9748 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9749 value_size = get_atomic_type_size(get_intptr_kind());
9754 if (value_flags != flags || value_size != size)
9758 } while (expression->kind == EXPR_UNARY_CAST);
9762 if (!is_lvalue(expression)) {
9763 errorf(&expression->base.source_position,
9764 "asm output argument is not an lvalue");
9767 if (argument->constraints.begin[0] == '+')
9768 mark_vars_read(expression, NULL);
9770 mark_vars_read(expression, NULL);
9772 argument->expression = expression;
9773 expect(')', end_error);
9775 set_address_taken(expression, true);
9778 anchor = &argument->next;
9780 if (token.type != ',')
9791 * Parse a asm statement clobber specification.
9793 static asm_clobber_t *parse_asm_clobbers(void)
9795 asm_clobber_t *result = NULL;
9796 asm_clobber_t *last = NULL;
9798 while (token.type == T_STRING_LITERAL) {
9799 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9800 clobber->clobber = parse_string_literals();
9803 last->next = clobber;
9809 if (token.type != ',')
9818 * Parse an asm statement.
9820 static statement_t *parse_asm_statement(void)
9822 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9823 asm_statement_t *asm_statement = &statement->asms;
9827 if (token.type == T_volatile) {
9829 asm_statement->is_volatile = true;
9832 expect('(', end_error);
9833 add_anchor_token(')');
9834 add_anchor_token(':');
9835 asm_statement->asm_text = parse_string_literals();
9837 if (token.type != ':') {
9838 rem_anchor_token(':');
9843 asm_statement->outputs = parse_asm_arguments(true);
9844 if (token.type != ':') {
9845 rem_anchor_token(':');
9850 asm_statement->inputs = parse_asm_arguments(false);
9851 if (token.type != ':') {
9852 rem_anchor_token(':');
9855 rem_anchor_token(':');
9858 asm_statement->clobbers = parse_asm_clobbers();
9861 rem_anchor_token(')');
9862 expect(')', end_error);
9863 expect(';', end_error);
9865 if (asm_statement->outputs == NULL) {
9866 /* GCC: An 'asm' instruction without any output operands will be treated
9867 * identically to a volatile 'asm' instruction. */
9868 asm_statement->is_volatile = true;
9873 return create_invalid_statement();
9877 * Parse a case statement.
9879 static statement_t *parse_case_statement(void)
9881 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9882 source_position_t *const pos = &statement->base.source_position;
9886 expression_t *const expression = parse_expression();
9887 statement->case_label.expression = expression;
9888 if (!is_constant_expression(expression)) {
9889 /* This check does not prevent the error message in all cases of an
9890 * prior error while parsing the expression. At least it catches the
9891 * common case of a mistyped enum entry. */
9892 if (is_type_valid(skip_typeref(expression->base.type))) {
9893 errorf(pos, "case label does not reduce to an integer constant");
9895 statement->case_label.is_bad = true;
9897 long const val = fold_constant(expression);
9898 statement->case_label.first_case = val;
9899 statement->case_label.last_case = val;
9903 if (token.type == T_DOTDOTDOT) {
9905 expression_t *const end_range = parse_expression();
9906 statement->case_label.end_range = end_range;
9907 if (!is_constant_expression(end_range)) {
9908 /* This check does not prevent the error message in all cases of an
9909 * prior error while parsing the expression. At least it catches the
9910 * common case of a mistyped enum entry. */
9911 if (is_type_valid(skip_typeref(end_range->base.type))) {
9912 errorf(pos, "case range does not reduce to an integer constant");
9914 statement->case_label.is_bad = true;
9916 long const val = fold_constant(end_range);
9917 statement->case_label.last_case = val;
9919 if (warning.other && val < statement->case_label.first_case) {
9920 statement->case_label.is_empty_range = true;
9921 warningf(pos, "empty range specified");
9927 PUSH_PARENT(statement);
9929 expect(':', end_error);
9932 if (current_switch != NULL) {
9933 if (! statement->case_label.is_bad) {
9934 /* Check for duplicate case values */
9935 case_label_statement_t *c = &statement->case_label;
9936 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9937 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9940 if (c->last_case < l->first_case || c->first_case > l->last_case)
9943 errorf(pos, "duplicate case value (previously used %P)",
9944 &l->base.source_position);
9948 /* link all cases into the switch statement */
9949 if (current_switch->last_case == NULL) {
9950 current_switch->first_case = &statement->case_label;
9952 current_switch->last_case->next = &statement->case_label;
9954 current_switch->last_case = &statement->case_label;
9956 errorf(pos, "case label not within a switch statement");
9959 statement_t *const inner_stmt = parse_statement();
9960 statement->case_label.statement = inner_stmt;
9961 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9962 errorf(&inner_stmt->base.source_position, "declaration after case label");
9970 * Parse a default statement.
9972 static statement_t *parse_default_statement(void)
9974 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9978 PUSH_PARENT(statement);
9980 expect(':', end_error);
9981 if (current_switch != NULL) {
9982 const case_label_statement_t *def_label = current_switch->default_label;
9983 if (def_label != NULL) {
9984 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9985 &def_label->base.source_position);
9987 current_switch->default_label = &statement->case_label;
9989 /* link all cases into the switch statement */
9990 if (current_switch->last_case == NULL) {
9991 current_switch->first_case = &statement->case_label;
9993 current_switch->last_case->next = &statement->case_label;
9995 current_switch->last_case = &statement->case_label;
9998 errorf(&statement->base.source_position,
9999 "'default' label not within a switch statement");
10002 statement_t *const inner_stmt = parse_statement();
10003 statement->case_label.statement = inner_stmt;
10004 if (inner_stmt->kind == STATEMENT_DECLARATION) {
10005 errorf(&inner_stmt->base.source_position, "declaration after default label");
10012 return create_invalid_statement();
10016 * Parse a label statement.
10018 static statement_t *parse_label_statement(void)
10020 assert(token.type == T_IDENTIFIER);
10021 symbol_t *symbol = token.v.symbol;
10022 label_t *label = get_label(symbol);
10024 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
10025 statement->label.label = label;
10029 PUSH_PARENT(statement);
10031 /* if statement is already set then the label is defined twice,
10032 * otherwise it was just mentioned in a goto/local label declaration so far
10034 if (label->statement != NULL) {
10035 errorf(HERE, "duplicate label '%Y' (declared %P)",
10036 symbol, &label->base.source_position);
10038 label->base.source_position = token.source_position;
10039 label->statement = statement;
10044 if (token.type == '}') {
10045 /* TODO only warn? */
10046 if (warning.other && false) {
10047 warningf(HERE, "label at end of compound statement");
10048 statement->label.statement = create_empty_statement();
10050 errorf(HERE, "label at end of compound statement");
10051 statement->label.statement = create_invalid_statement();
10053 } else if (token.type == ';') {
10054 /* Eat an empty statement here, to avoid the warning about an empty
10055 * statement after a label. label:; is commonly used to have a label
10056 * before a closing brace. */
10057 statement->label.statement = create_empty_statement();
10060 statement_t *const inner_stmt = parse_statement();
10061 statement->label.statement = inner_stmt;
10062 if (inner_stmt->kind == STATEMENT_DECLARATION) {
10063 errorf(&inner_stmt->base.source_position, "declaration after label");
10067 /* remember the labels in a list for later checking */
10068 *label_anchor = &statement->label;
10069 label_anchor = &statement->label.next;
10076 * Parse an if statement.
10078 static statement_t *parse_if(void)
10080 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
10084 PUSH_PARENT(statement);
10086 add_anchor_token('{');
10088 expect('(', end_error);
10089 add_anchor_token(')');
10090 expression_t *const expr = parse_expression();
10091 statement->ifs.condition = expr;
10092 /* §6.8.4.1:1 The controlling expression of an if statement shall have
10094 semantic_condition(expr, "condition of 'if'-statment");
10095 mark_vars_read(expr, NULL);
10096 rem_anchor_token(')');
10097 expect(')', end_error);
10100 rem_anchor_token('{');
10102 add_anchor_token(T_else);
10103 statement_t *const true_stmt = parse_statement();
10104 statement->ifs.true_statement = true_stmt;
10105 rem_anchor_token(T_else);
10107 if (token.type == T_else) {
10109 statement->ifs.false_statement = parse_statement();
10110 } else if (warning.parentheses &&
10111 true_stmt->kind == STATEMENT_IF &&
10112 true_stmt->ifs.false_statement != NULL) {
10113 warningf(&true_stmt->base.source_position,
10114 "suggest explicit braces to avoid ambiguous 'else'");
10122 * Check that all enums are handled in a switch.
10124 * @param statement the switch statement to check
10126 static void check_enum_cases(const switch_statement_t *statement)
10128 const type_t *type = skip_typeref(statement->expression->base.type);
10129 if (! is_type_enum(type))
10131 const enum_type_t *enumt = &type->enumt;
10133 /* if we have a default, no warnings */
10134 if (statement->default_label != NULL)
10137 /* FIXME: calculation of value should be done while parsing */
10138 /* TODO: quadratic algorithm here. Change to an n log n one */
10139 long last_value = -1;
10140 const entity_t *entry = enumt->enume->base.next;
10141 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
10142 entry = entry->base.next) {
10143 const expression_t *expression = entry->enum_value.value;
10144 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
10145 bool found = false;
10146 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
10147 if (l->expression == NULL)
10149 if (l->first_case <= value && value <= l->last_case) {
10155 warningf(&statement->base.source_position,
10156 "enumeration value '%Y' not handled in switch",
10157 entry->base.symbol);
10159 last_value = value;
10164 * Parse a switch statement.
10166 static statement_t *parse_switch(void)
10168 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
10172 PUSH_PARENT(statement);
10174 expect('(', end_error);
10175 add_anchor_token(')');
10176 expression_t *const expr = parse_expression();
10177 mark_vars_read(expr, NULL);
10178 type_t * type = skip_typeref(expr->base.type);
10179 if (is_type_integer(type)) {
10180 type = promote_integer(type);
10181 if (warning.traditional) {
10182 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
10183 warningf(&expr->base.source_position,
10184 "'%T' switch expression not converted to '%T' in ISO C",
10188 } else if (is_type_valid(type)) {
10189 errorf(&expr->base.source_position,
10190 "switch quantity is not an integer, but '%T'", type);
10191 type = type_error_type;
10193 statement->switchs.expression = create_implicit_cast(expr, type);
10194 expect(')', end_error);
10195 rem_anchor_token(')');
10197 switch_statement_t *rem = current_switch;
10198 current_switch = &statement->switchs;
10199 statement->switchs.body = parse_statement();
10200 current_switch = rem;
10202 if (warning.switch_default &&
10203 statement->switchs.default_label == NULL) {
10204 warningf(&statement->base.source_position, "switch has no default case");
10206 if (warning.switch_enum)
10207 check_enum_cases(&statement->switchs);
10213 return create_invalid_statement();
10216 static statement_t *parse_loop_body(statement_t *const loop)
10218 statement_t *const rem = current_loop;
10219 current_loop = loop;
10221 statement_t *const body = parse_statement();
10223 current_loop = rem;
10228 * Parse a while statement.
10230 static statement_t *parse_while(void)
10232 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
10236 PUSH_PARENT(statement);
10238 expect('(', end_error);
10239 add_anchor_token(')');
10240 expression_t *const cond = parse_expression();
10241 statement->whiles.condition = cond;
10242 /* §6.8.5:2 The controlling expression of an iteration statement shall
10243 * have scalar type. */
10244 semantic_condition(cond, "condition of 'while'-statement");
10245 mark_vars_read(cond, NULL);
10246 rem_anchor_token(')');
10247 expect(')', end_error);
10249 statement->whiles.body = parse_loop_body(statement);
10255 return create_invalid_statement();
10259 * Parse a do statement.
10261 static statement_t *parse_do(void)
10263 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
10267 PUSH_PARENT(statement);
10269 add_anchor_token(T_while);
10270 statement->do_while.body = parse_loop_body(statement);
10271 rem_anchor_token(T_while);
10273 expect(T_while, end_error);
10274 expect('(', end_error);
10275 add_anchor_token(')');
10276 expression_t *const cond = parse_expression();
10277 statement->do_while.condition = cond;
10278 /* §6.8.5:2 The controlling expression of an iteration statement shall
10279 * have scalar type. */
10280 semantic_condition(cond, "condition of 'do-while'-statement");
10281 mark_vars_read(cond, NULL);
10282 rem_anchor_token(')');
10283 expect(')', end_error);
10284 expect(';', end_error);
10290 return create_invalid_statement();
10294 * Parse a for statement.
10296 static statement_t *parse_for(void)
10298 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
10302 expect('(', end_error1);
10303 add_anchor_token(')');
10305 PUSH_PARENT(statement);
10307 size_t const top = environment_top();
10308 scope_t *old_scope = scope_push(&statement->fors.scope);
10310 if (token.type == ';') {
10312 } else if (is_declaration_specifier(&token, false)) {
10313 parse_declaration(record_entity, DECL_FLAGS_NONE);
10315 add_anchor_token(';');
10316 expression_t *const init = parse_expression();
10317 statement->fors.initialisation = init;
10318 mark_vars_read(init, ENT_ANY);
10319 if (warning.unused_value && !expression_has_effect(init)) {
10320 warningf(&init->base.source_position,
10321 "initialisation of 'for'-statement has no effect");
10323 rem_anchor_token(';');
10324 expect(';', end_error2);
10327 if (token.type != ';') {
10328 add_anchor_token(';');
10329 expression_t *const cond = parse_expression();
10330 statement->fors.condition = cond;
10331 /* §6.8.5:2 The controlling expression of an iteration statement
10332 * shall have scalar type. */
10333 semantic_condition(cond, "condition of 'for'-statement");
10334 mark_vars_read(cond, NULL);
10335 rem_anchor_token(';');
10337 expect(';', end_error2);
10338 if (token.type != ')') {
10339 expression_t *const step = parse_expression();
10340 statement->fors.step = step;
10341 mark_vars_read(step, ENT_ANY);
10342 if (warning.unused_value && !expression_has_effect(step)) {
10343 warningf(&step->base.source_position,
10344 "step of 'for'-statement has no effect");
10347 expect(')', end_error2);
10348 rem_anchor_token(')');
10349 statement->fors.body = parse_loop_body(statement);
10351 assert(current_scope == &statement->fors.scope);
10352 scope_pop(old_scope);
10353 environment_pop_to(top);
10360 rem_anchor_token(')');
10361 assert(current_scope == &statement->fors.scope);
10362 scope_pop(old_scope);
10363 environment_pop_to(top);
10367 return create_invalid_statement();
10371 * Parse a goto statement.
10373 static statement_t *parse_goto(void)
10375 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
10378 if (GNU_MODE && token.type == '*') {
10380 expression_t *expression = parse_expression();
10381 mark_vars_read(expression, NULL);
10383 /* Argh: although documentation says the expression must be of type void*,
10384 * gcc accepts anything that can be casted into void* without error */
10385 type_t *type = expression->base.type;
10387 if (type != type_error_type) {
10388 if (!is_type_pointer(type) && !is_type_integer(type)) {
10389 errorf(&expression->base.source_position,
10390 "cannot convert to a pointer type");
10391 } else if (warning.other && type != type_void_ptr) {
10392 warningf(&expression->base.source_position,
10393 "type of computed goto expression should be 'void*' not '%T'", type);
10395 expression = create_implicit_cast(expression, type_void_ptr);
10398 statement->gotos.expression = expression;
10400 if (token.type != T_IDENTIFIER) {
10402 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
10404 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
10405 eat_until_anchor();
10408 symbol_t *symbol = token.v.symbol;
10411 statement->gotos.label = get_label(symbol);
10414 /* remember the goto's in a list for later checking */
10415 *goto_anchor = &statement->gotos;
10416 goto_anchor = &statement->gotos.next;
10418 expect(';', end_error);
10422 return create_invalid_statement();
10426 * Parse a continue statement.
10428 static statement_t *parse_continue(void)
10430 if (current_loop == NULL) {
10431 errorf(HERE, "continue statement not within loop");
10434 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10437 expect(';', end_error);
10444 * Parse a break statement.
10446 static statement_t *parse_break(void)
10448 if (current_switch == NULL && current_loop == NULL) {
10449 errorf(HERE, "break statement not within loop or switch");
10452 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10455 expect(';', end_error);
10462 * Parse a __leave statement.
10464 static statement_t *parse_leave_statement(void)
10466 if (current_try == NULL) {
10467 errorf(HERE, "__leave statement not within __try");
10470 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10473 expect(';', end_error);
10480 * Check if a given entity represents a local variable.
10482 static bool is_local_variable(const entity_t *entity)
10484 if (entity->kind != ENTITY_VARIABLE)
10487 switch ((storage_class_tag_t) entity->declaration.storage_class) {
10488 case STORAGE_CLASS_AUTO:
10489 case STORAGE_CLASS_REGISTER: {
10490 const type_t *type = skip_typeref(entity->declaration.type);
10491 if (is_type_function(type)) {
10503 * Check if a given expression represents a local variable.
10505 static bool expression_is_local_variable(const expression_t *expression)
10507 if (expression->base.kind != EXPR_REFERENCE) {
10510 const entity_t *entity = expression->reference.entity;
10511 return is_local_variable(entity);
10515 * Check if a given expression represents a local variable and
10516 * return its declaration then, else return NULL.
10518 entity_t *expression_is_variable(const expression_t *expression)
10520 if (expression->base.kind != EXPR_REFERENCE) {
10523 entity_t *entity = expression->reference.entity;
10524 if (entity->kind != ENTITY_VARIABLE)
10531 * Parse a return statement.
10533 static statement_t *parse_return(void)
10537 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10539 expression_t *return_value = NULL;
10540 if (token.type != ';') {
10541 return_value = parse_expression();
10542 mark_vars_read(return_value, NULL);
10545 const type_t *const func_type = skip_typeref(current_function->base.type);
10546 assert(is_type_function(func_type));
10547 type_t *const return_type = skip_typeref(func_type->function.return_type);
10549 source_position_t const *const pos = &statement->base.source_position;
10550 if (return_value != NULL) {
10551 type_t *return_value_type = skip_typeref(return_value->base.type);
10553 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10554 if (is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10555 /* ISO/IEC 14882:1998(E) §6.6.3:2 */
10556 /* Only warn in C mode, because GCC does the same */
10557 if (c_mode & _CXX || strict_mode) {
10559 "'return' with a value, in function returning 'void'");
10560 } else if (warning.other) {
10562 "'return' with a value, in function returning 'void'");
10564 } else if (!(c_mode & _CXX)) { /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10565 /* Only warn in C mode, because GCC does the same */
10568 "'return' with expression in function return 'void'");
10569 } else if (warning.other) {
10571 "'return' with expression in function return 'void'");
10575 assign_error_t error = semantic_assign(return_type, return_value);
10576 report_assign_error(error, return_type, return_value, "'return'",
10579 return_value = create_implicit_cast(return_value, return_type);
10580 /* check for returning address of a local var */
10581 if (warning.other && return_value != NULL
10582 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10583 const expression_t *expression = return_value->unary.value;
10584 if (expression_is_local_variable(expression)) {
10585 warningf(pos, "function returns address of local variable");
10588 } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10589 /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10590 if (c_mode & _CXX || strict_mode) {
10592 "'return' without value, in function returning non-void");
10595 "'return' without value, in function returning non-void");
10598 statement->returns.value = return_value;
10600 expect(';', end_error);
10607 * Parse a declaration statement.
10609 static statement_t *parse_declaration_statement(void)
10611 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10613 entity_t *before = current_scope->last_entity;
10615 parse_external_declaration();
10617 parse_declaration(record_entity, DECL_FLAGS_NONE);
10620 declaration_statement_t *const decl = &statement->declaration;
10621 entity_t *const begin =
10622 before != NULL ? before->base.next : current_scope->entities;
10623 decl->declarations_begin = begin;
10624 decl->declarations_end = begin != NULL ? current_scope->last_entity : NULL;
10630 * Parse an expression statement, ie. expr ';'.
10632 static statement_t *parse_expression_statement(void)
10634 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10636 expression_t *const expr = parse_expression();
10637 statement->expression.expression = expr;
10638 mark_vars_read(expr, ENT_ANY);
10640 expect(';', end_error);
10647 * Parse a microsoft __try { } __finally { } or
10648 * __try{ } __except() { }
10650 static statement_t *parse_ms_try_statment(void)
10652 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10655 PUSH_PARENT(statement);
10657 ms_try_statement_t *rem = current_try;
10658 current_try = &statement->ms_try;
10659 statement->ms_try.try_statement = parse_compound_statement(false);
10664 if (token.type == T___except) {
10666 expect('(', end_error);
10667 add_anchor_token(')');
10668 expression_t *const expr = parse_expression();
10669 mark_vars_read(expr, NULL);
10670 type_t * type = skip_typeref(expr->base.type);
10671 if (is_type_integer(type)) {
10672 type = promote_integer(type);
10673 } else if (is_type_valid(type)) {
10674 errorf(&expr->base.source_position,
10675 "__expect expression is not an integer, but '%T'", type);
10676 type = type_error_type;
10678 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10679 rem_anchor_token(')');
10680 expect(')', end_error);
10681 statement->ms_try.final_statement = parse_compound_statement(false);
10682 } else if (token.type == T__finally) {
10684 statement->ms_try.final_statement = parse_compound_statement(false);
10686 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10687 return create_invalid_statement();
10691 return create_invalid_statement();
10694 static statement_t *parse_empty_statement(void)
10696 if (warning.empty_statement) {
10697 warningf(HERE, "statement is empty");
10699 statement_t *const statement = create_empty_statement();
10704 static statement_t *parse_local_label_declaration(void)
10706 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10710 entity_t *begin = NULL, *end = NULL;
10713 if (token.type != T_IDENTIFIER) {
10714 parse_error_expected("while parsing local label declaration",
10715 T_IDENTIFIER, NULL);
10718 symbol_t *symbol = token.v.symbol;
10719 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10720 if (entity != NULL && entity->base.parent_scope == current_scope) {
10721 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10722 symbol, &entity->base.source_position);
10724 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10726 entity->base.parent_scope = current_scope;
10727 entity->base.namespc = NAMESPACE_LABEL;
10728 entity->base.source_position = token.source_position;
10729 entity->base.symbol = symbol;
10732 end->base.next = entity;
10737 environment_push(entity);
10741 if (token.type != ',')
10747 statement->declaration.declarations_begin = begin;
10748 statement->declaration.declarations_end = end;
10752 static void parse_namespace_definition(void)
10756 entity_t *entity = NULL;
10757 symbol_t *symbol = NULL;
10759 if (token.type == T_IDENTIFIER) {
10760 symbol = token.v.symbol;
10763 entity = get_entity(symbol, NAMESPACE_NORMAL);
10764 if (entity != NULL &&
10765 entity->kind != ENTITY_NAMESPACE &&
10766 entity->base.parent_scope == current_scope) {
10767 if (!is_error_entity(entity)) {
10768 error_redefined_as_different_kind(&token.source_position,
10769 entity, ENTITY_NAMESPACE);
10775 if (entity == NULL) {
10776 entity = allocate_entity_zero(ENTITY_NAMESPACE);
10777 entity->base.symbol = symbol;
10778 entity->base.source_position = token.source_position;
10779 entity->base.namespc = NAMESPACE_NORMAL;
10780 entity->base.parent_scope = current_scope;
10783 if (token.type == '=') {
10784 /* TODO: parse namespace alias */
10785 panic("namespace alias definition not supported yet");
10788 environment_push(entity);
10789 append_entity(current_scope, entity);
10791 size_t const top = environment_top();
10792 scope_t *old_scope = scope_push(&entity->namespacee.members);
10794 expect('{', end_error);
10796 expect('}', end_error);
10799 assert(current_scope == &entity->namespacee.members);
10800 scope_pop(old_scope);
10801 environment_pop_to(top);
10805 * Parse a statement.
10806 * There's also parse_statement() which additionally checks for
10807 * "statement has no effect" warnings
10809 static statement_t *intern_parse_statement(void)
10811 statement_t *statement = NULL;
10813 /* declaration or statement */
10814 add_anchor_token(';');
10815 switch (token.type) {
10816 case T_IDENTIFIER: {
10817 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10818 if (la1_type == ':') {
10819 statement = parse_label_statement();
10820 } else if (is_typedef_symbol(token.v.symbol)) {
10821 statement = parse_declaration_statement();
10823 /* it's an identifier, the grammar says this must be an
10824 * expression statement. However it is common that users mistype
10825 * declaration types, so we guess a bit here to improve robustness
10826 * for incorrect programs */
10827 switch (la1_type) {
10830 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10831 goto expression_statment;
10836 statement = parse_declaration_statement();
10840 expression_statment:
10841 statement = parse_expression_statement();
10848 case T___extension__:
10849 /* This can be a prefix to a declaration or an expression statement.
10850 * We simply eat it now and parse the rest with tail recursion. */
10853 } while (token.type == T___extension__);
10854 bool old_gcc_extension = in_gcc_extension;
10855 in_gcc_extension = true;
10856 statement = intern_parse_statement();
10857 in_gcc_extension = old_gcc_extension;
10861 statement = parse_declaration_statement();
10865 statement = parse_local_label_declaration();
10868 case ';': statement = parse_empty_statement(); break;
10869 case '{': statement = parse_compound_statement(false); break;
10870 case T___leave: statement = parse_leave_statement(); break;
10871 case T___try: statement = parse_ms_try_statment(); break;
10872 case T_asm: statement = parse_asm_statement(); break;
10873 case T_break: statement = parse_break(); break;
10874 case T_case: statement = parse_case_statement(); break;
10875 case T_continue: statement = parse_continue(); break;
10876 case T_default: statement = parse_default_statement(); break;
10877 case T_do: statement = parse_do(); break;
10878 case T_for: statement = parse_for(); break;
10879 case T_goto: statement = parse_goto(); break;
10880 case T_if: statement = parse_if(); break;
10881 case T_return: statement = parse_return(); break;
10882 case T_switch: statement = parse_switch(); break;
10883 case T_while: statement = parse_while(); break;
10886 statement = parse_expression_statement();
10890 errorf(HERE, "unexpected token %K while parsing statement", &token);
10891 statement = create_invalid_statement();
10896 rem_anchor_token(';');
10898 assert(statement != NULL
10899 && statement->base.source_position.input_name != NULL);
10905 * parse a statement and emits "statement has no effect" warning if needed
10906 * (This is really a wrapper around intern_parse_statement with check for 1
10907 * single warning. It is needed, because for statement expressions we have
10908 * to avoid the warning on the last statement)
10910 static statement_t *parse_statement(void)
10912 statement_t *statement = intern_parse_statement();
10914 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10915 expression_t *expression = statement->expression.expression;
10916 if (!expression_has_effect(expression)) {
10917 warningf(&expression->base.source_position,
10918 "statement has no effect");
10926 * Parse a compound statement.
10928 static statement_t *parse_compound_statement(bool inside_expression_statement)
10930 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10932 PUSH_PARENT(statement);
10935 add_anchor_token('}');
10936 /* tokens, which can start a statement */
10937 /* TODO MS, __builtin_FOO */
10938 add_anchor_token('!');
10939 add_anchor_token('&');
10940 add_anchor_token('(');
10941 add_anchor_token('*');
10942 add_anchor_token('+');
10943 add_anchor_token('-');
10944 add_anchor_token('{');
10945 add_anchor_token('~');
10946 add_anchor_token(T_CHARACTER_CONSTANT);
10947 add_anchor_token(T_COLONCOLON);
10948 add_anchor_token(T_FLOATINGPOINT);
10949 add_anchor_token(T_IDENTIFIER);
10950 add_anchor_token(T_INTEGER);
10951 add_anchor_token(T_MINUSMINUS);
10952 add_anchor_token(T_PLUSPLUS);
10953 add_anchor_token(T_STRING_LITERAL);
10954 add_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10955 add_anchor_token(T_WIDE_STRING_LITERAL);
10956 add_anchor_token(T__Bool);
10957 add_anchor_token(T__Complex);
10958 add_anchor_token(T__Imaginary);
10959 add_anchor_token(T___FUNCTION__);
10960 add_anchor_token(T___PRETTY_FUNCTION__);
10961 add_anchor_token(T___alignof__);
10962 add_anchor_token(T___attribute__);
10963 add_anchor_token(T___builtin_va_start);
10964 add_anchor_token(T___extension__);
10965 add_anchor_token(T___func__);
10966 add_anchor_token(T___imag__);
10967 add_anchor_token(T___label__);
10968 add_anchor_token(T___real__);
10969 add_anchor_token(T___thread);
10970 add_anchor_token(T_asm);
10971 add_anchor_token(T_auto);
10972 add_anchor_token(T_bool);
10973 add_anchor_token(T_break);
10974 add_anchor_token(T_case);
10975 add_anchor_token(T_char);
10976 add_anchor_token(T_class);
10977 add_anchor_token(T_const);
10978 add_anchor_token(T_const_cast);
10979 add_anchor_token(T_continue);
10980 add_anchor_token(T_default);
10981 add_anchor_token(T_delete);
10982 add_anchor_token(T_double);
10983 add_anchor_token(T_do);
10984 add_anchor_token(T_dynamic_cast);
10985 add_anchor_token(T_enum);
10986 add_anchor_token(T_extern);
10987 add_anchor_token(T_false);
10988 add_anchor_token(T_float);
10989 add_anchor_token(T_for);
10990 add_anchor_token(T_goto);
10991 add_anchor_token(T_if);
10992 add_anchor_token(T_inline);
10993 add_anchor_token(T_int);
10994 add_anchor_token(T_long);
10995 add_anchor_token(T_new);
10996 add_anchor_token(T_operator);
10997 add_anchor_token(T_register);
10998 add_anchor_token(T_reinterpret_cast);
10999 add_anchor_token(T_restrict);
11000 add_anchor_token(T_return);
11001 add_anchor_token(T_short);
11002 add_anchor_token(T_signed);
11003 add_anchor_token(T_sizeof);
11004 add_anchor_token(T_static);
11005 add_anchor_token(T_static_cast);
11006 add_anchor_token(T_struct);
11007 add_anchor_token(T_switch);
11008 add_anchor_token(T_template);
11009 add_anchor_token(T_this);
11010 add_anchor_token(T_throw);
11011 add_anchor_token(T_true);
11012 add_anchor_token(T_try);
11013 add_anchor_token(T_typedef);
11014 add_anchor_token(T_typeid);
11015 add_anchor_token(T_typename);
11016 add_anchor_token(T_typeof);
11017 add_anchor_token(T_union);
11018 add_anchor_token(T_unsigned);
11019 add_anchor_token(T_using);
11020 add_anchor_token(T_void);
11021 add_anchor_token(T_volatile);
11022 add_anchor_token(T_wchar_t);
11023 add_anchor_token(T_while);
11025 size_t const top = environment_top();
11026 scope_t *old_scope = scope_push(&statement->compound.scope);
11028 statement_t **anchor = &statement->compound.statements;
11029 bool only_decls_so_far = true;
11030 while (token.type != '}') {
11031 if (token.type == T_EOF) {
11032 errorf(&statement->base.source_position,
11033 "EOF while parsing compound statement");
11036 statement_t *sub_statement = intern_parse_statement();
11037 if (is_invalid_statement(sub_statement)) {
11038 /* an error occurred. if we are at an anchor, return */
11044 if (warning.declaration_after_statement) {
11045 if (sub_statement->kind != STATEMENT_DECLARATION) {
11046 only_decls_so_far = false;
11047 } else if (!only_decls_so_far) {
11048 warningf(&sub_statement->base.source_position,
11049 "ISO C90 forbids mixed declarations and code");
11053 *anchor = sub_statement;
11055 while (sub_statement->base.next != NULL)
11056 sub_statement = sub_statement->base.next;
11058 anchor = &sub_statement->base.next;
11062 /* look over all statements again to produce no effect warnings */
11063 if (warning.unused_value) {
11064 statement_t *sub_statement = statement->compound.statements;
11065 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
11066 if (sub_statement->kind != STATEMENT_EXPRESSION)
11068 /* don't emit a warning for the last expression in an expression
11069 * statement as it has always an effect */
11070 if (inside_expression_statement && sub_statement->base.next == NULL)
11073 expression_t *expression = sub_statement->expression.expression;
11074 if (!expression_has_effect(expression)) {
11075 warningf(&expression->base.source_position,
11076 "statement has no effect");
11082 rem_anchor_token(T_while);
11083 rem_anchor_token(T_wchar_t);
11084 rem_anchor_token(T_volatile);
11085 rem_anchor_token(T_void);
11086 rem_anchor_token(T_using);
11087 rem_anchor_token(T_unsigned);
11088 rem_anchor_token(T_union);
11089 rem_anchor_token(T_typeof);
11090 rem_anchor_token(T_typename);
11091 rem_anchor_token(T_typeid);
11092 rem_anchor_token(T_typedef);
11093 rem_anchor_token(T_try);
11094 rem_anchor_token(T_true);
11095 rem_anchor_token(T_throw);
11096 rem_anchor_token(T_this);
11097 rem_anchor_token(T_template);
11098 rem_anchor_token(T_switch);
11099 rem_anchor_token(T_struct);
11100 rem_anchor_token(T_static_cast);
11101 rem_anchor_token(T_static);
11102 rem_anchor_token(T_sizeof);
11103 rem_anchor_token(T_signed);
11104 rem_anchor_token(T_short);
11105 rem_anchor_token(T_return);
11106 rem_anchor_token(T_restrict);
11107 rem_anchor_token(T_reinterpret_cast);
11108 rem_anchor_token(T_register);
11109 rem_anchor_token(T_operator);
11110 rem_anchor_token(T_new);
11111 rem_anchor_token(T_long);
11112 rem_anchor_token(T_int);
11113 rem_anchor_token(T_inline);
11114 rem_anchor_token(T_if);
11115 rem_anchor_token(T_goto);
11116 rem_anchor_token(T_for);
11117 rem_anchor_token(T_float);
11118 rem_anchor_token(T_false);
11119 rem_anchor_token(T_extern);
11120 rem_anchor_token(T_enum);
11121 rem_anchor_token(T_dynamic_cast);
11122 rem_anchor_token(T_do);
11123 rem_anchor_token(T_double);
11124 rem_anchor_token(T_delete);
11125 rem_anchor_token(T_default);
11126 rem_anchor_token(T_continue);
11127 rem_anchor_token(T_const_cast);
11128 rem_anchor_token(T_const);
11129 rem_anchor_token(T_class);
11130 rem_anchor_token(T_char);
11131 rem_anchor_token(T_case);
11132 rem_anchor_token(T_break);
11133 rem_anchor_token(T_bool);
11134 rem_anchor_token(T_auto);
11135 rem_anchor_token(T_asm);
11136 rem_anchor_token(T___thread);
11137 rem_anchor_token(T___real__);
11138 rem_anchor_token(T___label__);
11139 rem_anchor_token(T___imag__);
11140 rem_anchor_token(T___func__);
11141 rem_anchor_token(T___extension__);
11142 rem_anchor_token(T___builtin_va_start);
11143 rem_anchor_token(T___attribute__);
11144 rem_anchor_token(T___alignof__);
11145 rem_anchor_token(T___PRETTY_FUNCTION__);
11146 rem_anchor_token(T___FUNCTION__);
11147 rem_anchor_token(T__Imaginary);
11148 rem_anchor_token(T__Complex);
11149 rem_anchor_token(T__Bool);
11150 rem_anchor_token(T_WIDE_STRING_LITERAL);
11151 rem_anchor_token(T_WIDE_CHARACTER_CONSTANT);
11152 rem_anchor_token(T_STRING_LITERAL);
11153 rem_anchor_token(T_PLUSPLUS);
11154 rem_anchor_token(T_MINUSMINUS);
11155 rem_anchor_token(T_INTEGER);
11156 rem_anchor_token(T_IDENTIFIER);
11157 rem_anchor_token(T_FLOATINGPOINT);
11158 rem_anchor_token(T_COLONCOLON);
11159 rem_anchor_token(T_CHARACTER_CONSTANT);
11160 rem_anchor_token('~');
11161 rem_anchor_token('{');
11162 rem_anchor_token('-');
11163 rem_anchor_token('+');
11164 rem_anchor_token('*');
11165 rem_anchor_token('(');
11166 rem_anchor_token('&');
11167 rem_anchor_token('!');
11168 rem_anchor_token('}');
11169 assert(current_scope == &statement->compound.scope);
11170 scope_pop(old_scope);
11171 environment_pop_to(top);
11178 * Check for unused global static functions and variables
11180 static void check_unused_globals(void)
11182 if (!warning.unused_function && !warning.unused_variable)
11185 for (const entity_t *entity = file_scope->entities; entity != NULL;
11186 entity = entity->base.next) {
11187 if (!is_declaration(entity))
11190 const declaration_t *declaration = &entity->declaration;
11191 if (declaration->used ||
11192 declaration->modifiers & DM_UNUSED ||
11193 declaration->modifiers & DM_USED ||
11194 declaration->storage_class != STORAGE_CLASS_STATIC)
11197 type_t *const type = declaration->type;
11199 if (entity->kind == ENTITY_FUNCTION) {
11200 /* inhibit warning for static inline functions */
11201 if (entity->function.is_inline)
11204 s = entity->function.statement != NULL ? "defined" : "declared";
11209 warningf(&declaration->base.source_position, "'%#T' %s but not used",
11210 type, declaration->base.symbol, s);
11214 static void parse_global_asm(void)
11216 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
11219 expect('(', end_error);
11221 statement->asms.asm_text = parse_string_literals();
11222 statement->base.next = unit->global_asm;
11223 unit->global_asm = statement;
11225 expect(')', end_error);
11226 expect(';', end_error);
11231 static void parse_linkage_specification(void)
11234 assert(token.type == T_STRING_LITERAL);
11236 const char *linkage = parse_string_literals().begin;
11238 linkage_kind_t old_linkage = current_linkage;
11239 linkage_kind_t new_linkage;
11240 if (strcmp(linkage, "C") == 0) {
11241 new_linkage = LINKAGE_C;
11242 } else if (strcmp(linkage, "C++") == 0) {
11243 new_linkage = LINKAGE_CXX;
11245 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
11246 new_linkage = LINKAGE_INVALID;
11248 current_linkage = new_linkage;
11250 if (token.type == '{') {
11253 expect('}', end_error);
11259 assert(current_linkage == new_linkage);
11260 current_linkage = old_linkage;
11263 static void parse_external(void)
11265 switch (token.type) {
11266 DECLARATION_START_NO_EXTERN
11268 case T___extension__:
11269 /* tokens below are for implicit int */
11270 case '&': /* & x; -> int& x; (and error later, because C++ has no
11272 case '*': /* * x; -> int* x; */
11273 case '(': /* (x); -> int (x); */
11274 parse_external_declaration();
11278 if (look_ahead(1)->type == T_STRING_LITERAL) {
11279 parse_linkage_specification();
11281 parse_external_declaration();
11286 parse_global_asm();
11290 parse_namespace_definition();
11294 if (!strict_mode) {
11296 warningf(HERE, "stray ';' outside of function");
11303 errorf(HERE, "stray %K outside of function", &token);
11304 if (token.type == '(' || token.type == '{' || token.type == '[')
11305 eat_until_matching_token(token.type);
11311 static void parse_externals(void)
11313 add_anchor_token('}');
11314 add_anchor_token(T_EOF);
11317 unsigned char token_anchor_copy[T_LAST_TOKEN];
11318 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
11321 while (token.type != T_EOF && token.type != '}') {
11323 bool anchor_leak = false;
11324 for (int i = 0; i != T_LAST_TOKEN; ++i) {
11325 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
11327 errorf(HERE, "Leaked anchor token %k %d times", i, count);
11328 anchor_leak = true;
11331 if (in_gcc_extension) {
11332 errorf(HERE, "Leaked __extension__");
11333 anchor_leak = true;
11343 rem_anchor_token(T_EOF);
11344 rem_anchor_token('}');
11348 * Parse a translation unit.
11350 static void parse_translation_unit(void)
11352 add_anchor_token(T_EOF);
11357 if (token.type == T_EOF)
11360 errorf(HERE, "stray %K outside of function", &token);
11361 if (token.type == '(' || token.type == '{' || token.type == '[')
11362 eat_until_matching_token(token.type);
11370 * @return the translation unit or NULL if errors occurred.
11372 void start_parsing(void)
11374 environment_stack = NEW_ARR_F(stack_entry_t, 0);
11375 label_stack = NEW_ARR_F(stack_entry_t, 0);
11376 diagnostic_count = 0;
11380 type_set_output(stderr);
11381 ast_set_output(stderr);
11383 assert(unit == NULL);
11384 unit = allocate_ast_zero(sizeof(unit[0]));
11386 assert(file_scope == NULL);
11387 file_scope = &unit->scope;
11389 assert(current_scope == NULL);
11390 scope_push(&unit->scope);
11393 translation_unit_t *finish_parsing(void)
11395 assert(current_scope == &unit->scope);
11398 assert(file_scope == &unit->scope);
11399 check_unused_globals();
11402 DEL_ARR_F(environment_stack);
11403 DEL_ARR_F(label_stack);
11405 translation_unit_t *result = unit;
11410 /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
11411 * are given length one. */
11412 static void complete_incomplete_arrays(void)
11414 size_t n = ARR_LEN(incomplete_arrays);
11415 for (size_t i = 0; i != n; ++i) {
11416 declaration_t *const decl = incomplete_arrays[i];
11417 type_t *const orig_type = decl->type;
11418 type_t *const type = skip_typeref(orig_type);
11420 if (!is_type_incomplete(type))
11423 if (warning.other) {
11424 warningf(&decl->base.source_position,
11425 "array '%#T' assumed to have one element",
11426 orig_type, decl->base.symbol);
11429 type_t *const new_type = duplicate_type(type);
11430 new_type->array.size_constant = true;
11431 new_type->array.has_implicit_size = true;
11432 new_type->array.size = 1;
11434 type_t *const result = identify_new_type(new_type);
11436 decl->type = result;
11442 lookahead_bufpos = 0;
11443 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
11446 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
11447 incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
11448 parse_translation_unit();
11449 complete_incomplete_arrays();
11450 DEL_ARR_F(incomplete_arrays);
11451 incomplete_arrays = NULL;
11455 * Initialize the parser.
11457 void init_parser(void)
11459 sym_anonymous = symbol_table_insert("<anonymous>");
11461 if (c_mode & _MS) {
11462 /* add predefined symbols for extended-decl-modifier */
11463 sym_align = symbol_table_insert("align");
11464 sym_allocate = symbol_table_insert("allocate");
11465 sym_dllimport = symbol_table_insert("dllimport");
11466 sym_dllexport = symbol_table_insert("dllexport");
11467 sym_naked = symbol_table_insert("naked");
11468 sym_noinline = symbol_table_insert("noinline");
11469 sym_returns_twice = symbol_table_insert("returns_twice");
11470 sym_noreturn = symbol_table_insert("noreturn");
11471 sym_nothrow = symbol_table_insert("nothrow");
11472 sym_novtable = symbol_table_insert("novtable");
11473 sym_property = symbol_table_insert("property");
11474 sym_get = symbol_table_insert("get");
11475 sym_put = symbol_table_insert("put");
11476 sym_selectany = symbol_table_insert("selectany");
11477 sym_thread = symbol_table_insert("thread");
11478 sym_uuid = symbol_table_insert("uuid");
11479 sym_deprecated = symbol_table_insert("deprecated");
11480 sym_restrict = symbol_table_insert("restrict");
11481 sym_noalias = symbol_table_insert("noalias");
11483 memset(token_anchor_set, 0, sizeof(token_anchor_set));
11485 init_expression_parsers();
11486 obstack_init(&temp_obst);
11488 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11489 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11493 * Terminate the parser.
11495 void exit_parser(void)
11497 obstack_free(&temp_obst, NULL);
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