2 * This file is part of cparser.
3 * Copyright (C) 2007-2009 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 "attribute_t.h"
38 #include "lang_features.h"
39 #include "walk_statements.h"
42 #include "adt/bitfiddle.h"
43 #include "adt/error.h"
44 #include "adt/array.h"
46 //#define PRINT_TOKENS
47 #define MAX_LOOKAHEAD 1
52 entity_namespace_t namespc;
55 typedef struct declaration_specifiers_t declaration_specifiers_t;
56 struct declaration_specifiers_t {
57 source_position_t source_position;
58 storage_class_t storage_class;
59 unsigned char alignment; /**< Alignment, 0 if not set. */
61 bool thread_local : 1; /**< GCC __thread */
62 attribute_t *attributes; /**< list of attributes */
67 * An environment for parsing initializers (and compound literals).
69 typedef struct parse_initializer_env_t {
70 type_t *type; /**< the type of the initializer. In case of an
71 array type with unspecified size this gets
72 adjusted to the actual size. */
73 entity_t *entity; /**< the variable that is initialized if any */
74 bool must_be_constant;
75 } parse_initializer_env_t;
77 typedef entity_t* (*parsed_declaration_func) (entity_t *declaration, bool is_definition);
79 /** The current token. */
81 /** The lookahead ring-buffer. */
82 static token_t lookahead_buffer[MAX_LOOKAHEAD];
83 /** Position of the next token in the lookahead buffer. */
84 static size_t lookahead_bufpos;
85 static stack_entry_t *environment_stack = NULL;
86 static stack_entry_t *label_stack = NULL;
87 static scope_t *file_scope = NULL;
88 static scope_t *current_scope = NULL;
89 /** Point to the current function declaration if inside a function. */
90 static function_t *current_function = NULL;
91 static entity_t *current_entity = NULL;
92 static entity_t *current_init_decl = NULL;
93 static switch_statement_t *current_switch = NULL;
94 static statement_t *current_loop = NULL;
95 static statement_t *current_parent = NULL;
96 static ms_try_statement_t *current_try = NULL;
97 static linkage_kind_t current_linkage = LINKAGE_INVALID;
98 static goto_statement_t *goto_first = NULL;
99 static goto_statement_t **goto_anchor = NULL;
100 static label_statement_t *label_first = NULL;
101 static label_statement_t **label_anchor = NULL;
102 /** current translation unit. */
103 static translation_unit_t *unit = NULL;
104 /** true if we are in a type property context (evaluation only for type) */
105 static bool in_type_prop = false;
106 /** true if we are in an __extension__ context. */
107 static bool in_gcc_extension = false;
108 static struct obstack temp_obst;
109 static entity_t *anonymous_entity;
110 static declaration_t **incomplete_arrays;
111 static elf_visibility_tag_t default_visibility = ELF_VISIBILITY_DEFAULT;
114 #define PUSH_PARENT(stmt) \
115 statement_t *const prev_parent = current_parent; \
116 ((void)(current_parent = (stmt)))
117 #define POP_PARENT ((void)(current_parent = prev_parent))
119 /** special symbol used for anonymous entities. */
120 static symbol_t *sym_anonymous = NULL;
122 /** The token anchor set */
123 static unsigned char token_anchor_set[T_LAST_TOKEN];
125 /** The current source position. */
126 #define HERE (&token.source_position)
128 /** true if we are in GCC mode. */
129 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
131 static statement_t *parse_compound_statement(bool inside_expression_statement);
132 static statement_t *parse_statement(void);
134 static expression_t *parse_subexpression(precedence_t);
135 static expression_t *parse_expression(void);
136 static type_t *parse_typename(void);
137 static void parse_externals(void);
138 static void parse_external(void);
140 static void parse_compound_type_entries(compound_t *compound_declaration);
142 static void check_call_argument(type_t *expected_type,
143 call_argument_t *argument, unsigned pos);
145 typedef enum declarator_flags_t {
147 DECL_MAY_BE_ABSTRACT = 1U << 0,
148 DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
149 DECL_IS_PARAMETER = 1U << 2
150 } declarator_flags_t;
152 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
153 declarator_flags_t flags);
155 static void semantic_comparison(binary_expression_t *expression);
157 #define STORAGE_CLASSES \
158 STORAGE_CLASSES_NO_EXTERN \
161 #define STORAGE_CLASSES_NO_EXTERN \
168 #define TYPE_QUALIFIERS \
173 case T__forceinline: \
174 case T___attribute__:
176 #define COMPLEX_SPECIFIERS \
178 #define IMAGINARY_SPECIFIERS \
181 #define TYPE_SPECIFIERS \
183 case T___builtin_va_list: \
208 #define DECLARATION_START \
213 #define DECLARATION_START_NO_EXTERN \
214 STORAGE_CLASSES_NO_EXTERN \
218 #define EXPRESSION_START \
227 case T_CHARACTER_CONSTANT: \
228 case T_FLOATINGPOINT: \
229 case T_FLOATINGPOINT_HEXADECIMAL: \
231 case T_INTEGER_HEXADECIMAL: \
232 case T_INTEGER_OCTAL: \
235 case T_STRING_LITERAL: \
236 case T_WIDE_CHARACTER_CONSTANT: \
237 case T_WIDE_STRING_LITERAL: \
238 case T___FUNCDNAME__: \
239 case T___FUNCSIG__: \
240 case T___FUNCTION__: \
241 case T___PRETTY_FUNCTION__: \
242 case T___alignof__: \
243 case T___builtin_classify_type: \
244 case T___builtin_constant_p: \
245 case T___builtin_isgreater: \
246 case T___builtin_isgreaterequal: \
247 case T___builtin_isless: \
248 case T___builtin_islessequal: \
249 case T___builtin_islessgreater: \
250 case T___builtin_isunordered: \
251 case T___builtin_offsetof: \
252 case T___builtin_va_arg: \
253 case T___builtin_va_copy: \
254 case T___builtin_va_start: \
265 * Returns the size of a statement node.
267 * @param kind the statement kind
269 static size_t get_statement_struct_size(statement_kind_t kind)
271 static const size_t sizes[] = {
272 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
273 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
274 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
275 [STATEMENT_RETURN] = sizeof(return_statement_t),
276 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
277 [STATEMENT_IF] = sizeof(if_statement_t),
278 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
279 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
280 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
281 [STATEMENT_BREAK] = sizeof(statement_base_t),
282 [STATEMENT_GOTO] = sizeof(goto_statement_t),
283 [STATEMENT_LABEL] = sizeof(label_statement_t),
284 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
285 [STATEMENT_WHILE] = sizeof(while_statement_t),
286 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
287 [STATEMENT_FOR] = sizeof(for_statement_t),
288 [STATEMENT_ASM] = sizeof(asm_statement_t),
289 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
290 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
292 assert((size_t)kind < lengthof(sizes));
293 assert(sizes[kind] != 0);
298 * Returns the size of an expression node.
300 * @param kind the expression kind
302 static size_t get_expression_struct_size(expression_kind_t kind)
304 static const size_t sizes[] = {
305 [EXPR_INVALID] = sizeof(expression_base_t),
306 [EXPR_REFERENCE] = sizeof(reference_expression_t),
307 [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t),
308 [EXPR_LITERAL_BOOLEAN] = sizeof(literal_expression_t),
309 [EXPR_LITERAL_INTEGER] = sizeof(literal_expression_t),
310 [EXPR_LITERAL_INTEGER_OCTAL] = sizeof(literal_expression_t),
311 [EXPR_LITERAL_INTEGER_HEXADECIMAL]= sizeof(literal_expression_t),
312 [EXPR_LITERAL_FLOATINGPOINT] = sizeof(literal_expression_t),
313 [EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL] = sizeof(literal_expression_t),
314 [EXPR_LITERAL_CHARACTER] = sizeof(literal_expression_t),
315 [EXPR_LITERAL_WIDE_CHARACTER] = sizeof(literal_expression_t),
316 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
317 [EXPR_WIDE_STRING_LITERAL] = sizeof(string_literal_expression_t),
318 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
319 [EXPR_CALL] = sizeof(call_expression_t),
320 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
321 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
322 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
323 [EXPR_SELECT] = sizeof(select_expression_t),
324 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
325 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
326 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
327 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
328 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
329 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
330 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = sizeof(builtin_types_compatible_expression_t),
331 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
332 [EXPR_VA_START] = sizeof(va_start_expression_t),
333 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
334 [EXPR_VA_COPY] = sizeof(va_copy_expression_t),
335 [EXPR_STATEMENT] = sizeof(statement_expression_t),
336 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
338 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
339 return sizes[EXPR_UNARY_FIRST];
341 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
342 return sizes[EXPR_BINARY_FIRST];
344 assert((size_t)kind < lengthof(sizes));
345 assert(sizes[kind] != 0);
350 * Allocate a statement node of given kind and initialize all
351 * fields with zero. Sets its source position to the position
352 * of the current token.
354 static statement_t *allocate_statement_zero(statement_kind_t kind)
356 size_t size = get_statement_struct_size(kind);
357 statement_t *res = allocate_ast_zero(size);
359 res->base.kind = kind;
360 res->base.parent = current_parent;
361 res->base.source_position = token.source_position;
366 * Allocate an expression node of given kind and initialize all
369 * @param kind the kind of the expression to allocate
371 static expression_t *allocate_expression_zero(expression_kind_t kind)
373 size_t size = get_expression_struct_size(kind);
374 expression_t *res = allocate_ast_zero(size);
376 res->base.kind = kind;
377 res->base.type = type_error_type;
378 res->base.source_position = token.source_position;
383 * Creates a new invalid expression at the source position
384 * of the current token.
386 static expression_t *create_invalid_expression(void)
388 return allocate_expression_zero(EXPR_INVALID);
392 * Creates a new invalid statement.
394 static statement_t *create_invalid_statement(void)
396 return allocate_statement_zero(STATEMENT_INVALID);
400 * Allocate a new empty statement.
402 static statement_t *create_empty_statement(void)
404 return allocate_statement_zero(STATEMENT_EMPTY);
408 * Returns the size of an initializer node.
410 * @param kind the initializer kind
412 static size_t get_initializer_size(initializer_kind_t kind)
414 static const size_t sizes[] = {
415 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
416 [INITIALIZER_STRING] = sizeof(initializer_string_t),
417 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
418 [INITIALIZER_LIST] = sizeof(initializer_list_t),
419 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
421 assert((size_t)kind < lengthof(sizes));
422 assert(sizes[kind] != 0);
427 * Allocate an initializer node of given kind and initialize all
430 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
432 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
439 * Returns the index of the top element of the environment stack.
441 static size_t environment_top(void)
443 return ARR_LEN(environment_stack);
447 * Returns the index of the top element of the global label stack.
449 static size_t label_top(void)
451 return ARR_LEN(label_stack);
455 * Return the next token.
457 static inline void next_token(void)
459 token = lookahead_buffer[lookahead_bufpos];
460 lookahead_buffer[lookahead_bufpos] = lexer_token;
463 lookahead_bufpos = (lookahead_bufpos + 1) % MAX_LOOKAHEAD;
466 print_token(stderr, &token);
467 fprintf(stderr, "\n");
471 static inline bool next_if(int const type)
473 if (token.type == type) {
482 * Return the next token with a given lookahead.
484 static inline const token_t *look_ahead(size_t num)
486 assert(0 < num && num <= MAX_LOOKAHEAD);
487 size_t pos = (lookahead_bufpos + num - 1) % MAX_LOOKAHEAD;
488 return &lookahead_buffer[pos];
492 * Adds a token type to the token type anchor set (a multi-set).
494 static void add_anchor_token(int token_type)
496 assert(0 <= token_type && token_type < T_LAST_TOKEN);
497 ++token_anchor_set[token_type];
501 * Set the number of tokens types of the given type
502 * to zero and return the old count.
504 static int save_and_reset_anchor_state(int token_type)
506 assert(0 <= token_type && token_type < T_LAST_TOKEN);
507 int count = token_anchor_set[token_type];
508 token_anchor_set[token_type] = 0;
513 * Restore the number of token types to the given count.
515 static void restore_anchor_state(int token_type, int count)
517 assert(0 <= token_type && token_type < T_LAST_TOKEN);
518 token_anchor_set[token_type] = count;
522 * Remove a token type from the token type anchor set (a multi-set).
524 static void rem_anchor_token(int token_type)
526 assert(0 <= token_type && token_type < T_LAST_TOKEN);
527 assert(token_anchor_set[token_type] != 0);
528 --token_anchor_set[token_type];
532 * Return true if the token type of the current token is
535 static bool at_anchor(void)
539 return token_anchor_set[token.type];
543 * Eat tokens until a matching token type is found.
545 static void eat_until_matching_token(int type)
549 case '(': end_token = ')'; break;
550 case '{': end_token = '}'; break;
551 case '[': end_token = ']'; break;
552 default: end_token = type; break;
555 unsigned parenthesis_count = 0;
556 unsigned brace_count = 0;
557 unsigned bracket_count = 0;
558 while (token.type != end_token ||
559 parenthesis_count != 0 ||
561 bracket_count != 0) {
562 switch (token.type) {
564 case '(': ++parenthesis_count; break;
565 case '{': ++brace_count; break;
566 case '[': ++bracket_count; break;
569 if (parenthesis_count > 0)
579 if (bracket_count > 0)
582 if (token.type == end_token &&
583 parenthesis_count == 0 &&
597 * Eat input tokens until an anchor is found.
599 static void eat_until_anchor(void)
601 while (token_anchor_set[token.type] == 0) {
602 if (token.type == '(' || token.type == '{' || token.type == '[')
603 eat_until_matching_token(token.type);
609 * Eat a whole block from input tokens.
611 static void eat_block(void)
613 eat_until_matching_token('{');
617 #define eat(token_type) (assert(token.type == (token_type)), next_token())
620 * Report a parse error because an expected token was not found.
623 #if defined __GNUC__ && __GNUC__ >= 4
624 __attribute__((sentinel))
626 void parse_error_expected(const char *message, ...)
628 if (message != NULL) {
629 errorf(HERE, "%s", message);
632 va_start(ap, message);
633 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
638 * Report an incompatible type.
640 static void type_error_incompatible(const char *msg,
641 const source_position_t *source_position, type_t *type1, type_t *type2)
643 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
648 * Expect the current token is the expected token.
649 * If not, generate an error, eat the current statement,
650 * and goto the error_label label.
652 #define expect(expected, error_label) \
654 if (UNLIKELY(token.type != (expected))) { \
655 parse_error_expected(NULL, (expected), NULL); \
656 add_anchor_token(expected); \
657 eat_until_anchor(); \
658 next_if((expected)); \
659 rem_anchor_token(expected); \
666 * Push a given scope on the scope stack and make it the
669 static scope_t *scope_push(scope_t *new_scope)
671 if (current_scope != NULL) {
672 new_scope->depth = current_scope->depth + 1;
675 scope_t *old_scope = current_scope;
676 current_scope = new_scope;
681 * Pop the current scope from the scope stack.
683 static void scope_pop(scope_t *old_scope)
685 current_scope = old_scope;
689 * Search an entity by its symbol in a given namespace.
691 static entity_t *get_entity(const symbol_t *const symbol,
692 namespace_tag_t namespc)
694 assert(namespc != NAMESPACE_INVALID);
695 entity_t *entity = symbol->entity;
696 for (; entity != NULL; entity = entity->base.symbol_next) {
697 if ((namespace_tag_t)entity->base.namespc == namespc)
704 /* §6.2.3:1 24) There is only one name space for tags even though three are
706 static entity_t *get_tag(symbol_t const *const symbol,
707 entity_kind_tag_t const kind)
709 entity_t *entity = get_entity(symbol, NAMESPACE_TAG);
710 if (entity != NULL && (entity_kind_tag_t)entity->kind != kind) {
712 "'%Y' defined as wrong kind of tag (previous definition %P)",
713 symbol, &entity->base.source_position);
720 * pushs an entity on the environment stack and links the corresponding symbol
723 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
725 symbol_t *symbol = entity->base.symbol;
726 entity_namespace_t namespc = entity->base.namespc;
727 assert(namespc != NAMESPACE_INVALID);
729 /* replace/add entity into entity list of the symbol */
732 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
737 /* replace an entry? */
738 if (iter->base.namespc == namespc) {
739 entity->base.symbol_next = iter->base.symbol_next;
745 /* remember old declaration */
747 entry.symbol = symbol;
748 entry.old_entity = iter;
749 entry.namespc = namespc;
750 ARR_APP1(stack_entry_t, *stack_ptr, entry);
754 * Push an entity on the environment stack.
756 static void environment_push(entity_t *entity)
758 assert(entity->base.source_position.input_name != NULL);
759 assert(entity->base.parent_scope != NULL);
760 stack_push(&environment_stack, entity);
764 * Push a declaration on the global label stack.
766 * @param declaration the declaration
768 static void label_push(entity_t *label)
770 /* we abuse the parameters scope as parent for the labels */
771 label->base.parent_scope = ¤t_function->parameters;
772 stack_push(&label_stack, label);
776 * pops symbols from the environment stack until @p new_top is the top element
778 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
780 stack_entry_t *stack = *stack_ptr;
781 size_t top = ARR_LEN(stack);
784 assert(new_top <= top);
788 for (i = top; i > new_top; --i) {
789 stack_entry_t *entry = &stack[i - 1];
791 entity_t *old_entity = entry->old_entity;
792 symbol_t *symbol = entry->symbol;
793 entity_namespace_t namespc = entry->namespc;
795 /* replace with old_entity/remove */
798 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
800 assert(iter != NULL);
801 /* replace an entry? */
802 if (iter->base.namespc == namespc)
806 /* restore definition from outer scopes (if there was one) */
807 if (old_entity != NULL) {
808 old_entity->base.symbol_next = iter->base.symbol_next;
809 *anchor = old_entity;
811 /* remove entry from list */
812 *anchor = iter->base.symbol_next;
816 ARR_SHRINKLEN(*stack_ptr, new_top);
820 * Pop all entries from the environment stack until the new_top
823 * @param new_top the new stack top
825 static void environment_pop_to(size_t new_top)
827 stack_pop_to(&environment_stack, new_top);
831 * Pop all entries from the global label stack until the new_top
834 * @param new_top the new stack top
836 static void label_pop_to(size_t new_top)
838 stack_pop_to(&label_stack, new_top);
841 static int get_akind_rank(atomic_type_kind_t akind)
847 * Return the type rank for an atomic type.
849 static int get_rank(const type_t *type)
851 assert(!is_typeref(type));
852 if (type->kind == TYPE_ENUM)
853 return get_akind_rank(type->enumt.akind);
855 assert(type->kind == TYPE_ATOMIC);
856 return get_akind_rank(type->atomic.akind);
860 * §6.3.1.1:2 Do integer promotion for a given type.
862 * @param type the type to promote
863 * @return the promoted type
865 static type_t *promote_integer(type_t *type)
867 if (type->kind == TYPE_BITFIELD)
868 type = type->bitfield.base_type;
870 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
877 * Create a cast expression.
879 * @param expression the expression to cast
880 * @param dest_type the destination type
882 static expression_t *create_cast_expression(expression_t *expression,
885 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
887 cast->unary.value = expression;
888 cast->base.type = dest_type;
894 * Check if a given expression represents a null pointer constant.
896 * @param expression the expression to check
898 static bool is_null_pointer_constant(const expression_t *expression)
900 /* skip void* cast */
901 if (expression->kind == EXPR_UNARY_CAST ||
902 expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
903 type_t *const type = skip_typeref(expression->base.type);
904 if (types_compatible(type, type_void_ptr))
905 expression = expression->unary.value;
908 type_t *const type = skip_typeref(expression->base.type);
909 if (!is_type_integer(type))
911 switch (is_constant_expression(expression)) {
912 case EXPR_CLASS_ERROR: return true;
913 case EXPR_CLASS_CONSTANT: return !fold_constant_to_bool(expression);
914 default: return false;
919 * Create an implicit cast expression.
921 * @param expression the expression to cast
922 * @param dest_type the destination type
924 static expression_t *create_implicit_cast(expression_t *expression,
927 type_t *const source_type = expression->base.type;
929 if (source_type == dest_type)
932 return create_cast_expression(expression, dest_type);
935 typedef enum assign_error_t {
937 ASSIGN_ERROR_INCOMPATIBLE,
938 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
939 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
940 ASSIGN_WARNING_POINTER_FROM_INT,
941 ASSIGN_WARNING_INT_FROM_POINTER
944 static void report_assign_error(assign_error_t error, type_t *orig_type_left, expression_t const *const right, char const *const context, source_position_t const *const pos)
946 type_t *const orig_type_right = right->base.type;
947 type_t *const type_left = skip_typeref(orig_type_left);
948 type_t *const type_right = skip_typeref(orig_type_right);
953 case ASSIGN_ERROR_INCOMPATIBLE:
954 errorf(pos, "destination type '%T' in %s is incompatible with type '%T'", orig_type_left, context, orig_type_right);
957 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
958 type_t *points_to_left = skip_typeref(type_left->pointer.points_to);
959 type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
961 /* the left type has all qualifiers from the right type */
962 unsigned missing_qualifiers = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
963 warningf(WARN_OTHER, pos, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type", orig_type_left, context, orig_type_right, missing_qualifiers);
967 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
968 warningf(WARN_OTHER, pos, "destination type '%T' in %s is incompatible with '%E' of type '%T'", orig_type_left, context, right, orig_type_right);
971 case ASSIGN_WARNING_POINTER_FROM_INT:
972 warningf(WARN_OTHER, pos, "%s makes pointer '%T' from integer '%T' without a cast", context, orig_type_left, orig_type_right);
975 case ASSIGN_WARNING_INT_FROM_POINTER:
976 warningf(WARN_OTHER, pos, "%s makes integer '%T' from pointer '%T' without a cast", context, orig_type_left, orig_type_right);
980 panic("invalid error value");
984 /** Implements the rules from §6.5.16.1 */
985 static assign_error_t semantic_assign(type_t *orig_type_left,
986 const expression_t *const right)
988 type_t *const orig_type_right = right->base.type;
989 type_t *const type_left = skip_typeref(orig_type_left);
990 type_t *const type_right = skip_typeref(orig_type_right);
992 if (is_type_pointer(type_left)) {
993 if (is_null_pointer_constant(right)) {
994 return ASSIGN_SUCCESS;
995 } else if (is_type_pointer(type_right)) {
996 type_t *points_to_left
997 = skip_typeref(type_left->pointer.points_to);
998 type_t *points_to_right
999 = skip_typeref(type_right->pointer.points_to);
1000 assign_error_t res = ASSIGN_SUCCESS;
1002 /* the left type has all qualifiers from the right type */
1003 unsigned missing_qualifiers
1004 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1005 if (missing_qualifiers != 0) {
1006 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1009 points_to_left = get_unqualified_type(points_to_left);
1010 points_to_right = get_unqualified_type(points_to_right);
1012 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1015 if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1016 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1017 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1020 if (!types_compatible(points_to_left, points_to_right)) {
1021 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1025 } else if (is_type_integer(type_right)) {
1026 return ASSIGN_WARNING_POINTER_FROM_INT;
1028 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1029 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1030 && is_type_pointer(type_right))) {
1031 return ASSIGN_SUCCESS;
1032 } else if (is_type_compound(type_left) && is_type_compound(type_right)) {
1033 type_t *const unqual_type_left = get_unqualified_type(type_left);
1034 type_t *const unqual_type_right = get_unqualified_type(type_right);
1035 if (types_compatible(unqual_type_left, unqual_type_right)) {
1036 return ASSIGN_SUCCESS;
1038 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1039 return ASSIGN_WARNING_INT_FROM_POINTER;
1042 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1043 return ASSIGN_SUCCESS;
1045 return ASSIGN_ERROR_INCOMPATIBLE;
1048 static expression_t *parse_constant_expression(void)
1050 expression_t *result = parse_subexpression(PREC_CONDITIONAL);
1052 if (is_constant_expression(result) == EXPR_CLASS_VARIABLE) {
1053 errorf(&result->base.source_position,
1054 "expression '%E' is not constant", result);
1060 static expression_t *parse_assignment_expression(void)
1062 return parse_subexpression(PREC_ASSIGNMENT);
1065 static void warn_string_concat(const source_position_t *pos)
1067 warningf(WARN_TRADITIONAL, pos, "traditional C rejects string constant concatenation");
1070 static string_t parse_string_literals(void)
1072 assert(token.type == T_STRING_LITERAL);
1073 string_t result = token.literal;
1077 while (token.type == T_STRING_LITERAL) {
1078 warn_string_concat(&token.source_position);
1079 result = concat_strings(&result, &token.literal);
1087 * compare two string, ignoring double underscores on the second.
1089 static int strcmp_underscore(const char *s1, const char *s2)
1091 if (s2[0] == '_' && s2[1] == '_') {
1092 size_t len2 = strlen(s2);
1093 size_t len1 = strlen(s1);
1094 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1095 return strncmp(s1, s2+2, len2-4);
1099 return strcmp(s1, s2);
1102 static attribute_t *allocate_attribute_zero(attribute_kind_t kind)
1104 attribute_t *attribute = allocate_ast_zero(sizeof(*attribute));
1105 attribute->kind = kind;
1106 attribute->source_position = *HERE;
1111 * Parse (gcc) attribute argument. From gcc comments in gcc source:
1114 * __attribute__ ( ( attribute-list ) )
1118 * attribute_list , attrib
1123 * any-word ( identifier )
1124 * any-word ( identifier , nonempty-expr-list )
1125 * any-word ( expr-list )
1127 * where the "identifier" must not be declared as a type, and
1128 * "any-word" may be any identifier (including one declared as a
1129 * type), a reserved word storage class specifier, type specifier or
1130 * type qualifier. ??? This still leaves out most reserved keywords
1131 * (following the old parser), shouldn't we include them, and why not
1132 * allow identifiers declared as types to start the arguments?
1134 * Matze: this all looks confusing and little systematic, so we're even less
1135 * strict and parse any list of things which are identifiers or
1136 * (assignment-)expressions.
1138 static attribute_argument_t *parse_attribute_arguments(void)
1140 attribute_argument_t *first = NULL;
1141 attribute_argument_t **anchor = &first;
1142 if (token.type != ')') do {
1143 attribute_argument_t *argument = allocate_ast_zero(sizeof(*argument));
1145 /* is it an identifier */
1146 if (token.type == T_IDENTIFIER
1147 && (look_ahead(1)->type == ',' || look_ahead(1)->type == ')')) {
1148 symbol_t *symbol = token.symbol;
1149 argument->kind = ATTRIBUTE_ARGUMENT_SYMBOL;
1150 argument->v.symbol = symbol;
1153 /* must be an expression */
1154 expression_t *expression = parse_assignment_expression();
1156 argument->kind = ATTRIBUTE_ARGUMENT_EXPRESSION;
1157 argument->v.expression = expression;
1160 /* append argument */
1162 anchor = &argument->next;
1163 } while (next_if(','));
1164 expect(')', end_error);
1173 static attribute_t *parse_attribute_asm(void)
1175 attribute_t *attribute = allocate_attribute_zero(ATTRIBUTE_GNU_ASM);
1178 expect('(', end_error);
1179 attribute->a.arguments = parse_attribute_arguments();
1186 static symbol_t *get_symbol_from_token(void)
1188 switch(token.type) {
1190 return token.symbol;
1219 /* maybe we need more tokens ... add them on demand */
1220 return get_token_symbol(&token);
1226 static attribute_t *parse_attribute_gnu_single(void)
1228 /* parse "any-word" */
1229 symbol_t *symbol = get_symbol_from_token();
1230 if (symbol == NULL) {
1231 parse_error_expected("while parsing attribute((", T_IDENTIFIER, NULL);
1235 attribute_kind_t kind;
1236 char const *const name = symbol->string;
1237 for (kind = ATTRIBUTE_GNU_FIRST;; ++kind) {
1238 if (kind > ATTRIBUTE_GNU_LAST) {
1239 warningf(WARN_ATTRIBUTE, HERE, "unknown attribute '%s' ignored", name);
1240 /* TODO: we should still save the attribute in the list... */
1241 kind = ATTRIBUTE_UNKNOWN;
1245 const char *attribute_name = get_attribute_name(kind);
1246 if (attribute_name != NULL
1247 && strcmp_underscore(attribute_name, name) == 0)
1251 attribute_t *attribute = allocate_attribute_zero(kind);
1254 /* parse arguments */
1256 attribute->a.arguments = parse_attribute_arguments();
1261 static attribute_t *parse_attribute_gnu(void)
1263 attribute_t *first = NULL;
1264 attribute_t **anchor = &first;
1266 eat(T___attribute__);
1267 expect('(', end_error);
1268 expect('(', end_error);
1270 if (token.type != ')') do {
1271 attribute_t *attribute = parse_attribute_gnu_single();
1272 if (attribute == NULL)
1275 *anchor = attribute;
1276 anchor = &attribute->next;
1277 } while (next_if(','));
1278 expect(')', end_error);
1279 expect(')', end_error);
1285 /** Parse attributes. */
1286 static attribute_t *parse_attributes(attribute_t *first)
1288 attribute_t **anchor = &first;
1290 while (*anchor != NULL)
1291 anchor = &(*anchor)->next;
1293 attribute_t *attribute;
1294 switch (token.type) {
1295 case T___attribute__:
1296 attribute = parse_attribute_gnu();
1297 if (attribute == NULL)
1302 attribute = parse_attribute_asm();
1306 attribute = allocate_attribute_zero(ATTRIBUTE_MS_CDECL);
1311 attribute = allocate_attribute_zero(ATTRIBUTE_MS_FASTCALL);
1315 case T__forceinline:
1316 attribute = allocate_attribute_zero(ATTRIBUTE_MS_FORCEINLINE);
1317 eat(T__forceinline);
1321 attribute = allocate_attribute_zero(ATTRIBUTE_MS_STDCALL);
1326 /* TODO record modifier */
1327 warningf(WARN_OTHER, HERE, "Ignoring declaration modifier %K", &token);
1328 attribute = allocate_attribute_zero(ATTRIBUTE_MS_THISCALL);
1336 *anchor = attribute;
1337 anchor = &attribute->next;
1341 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1343 static entity_t *determine_lhs_ent(expression_t *const expr,
1346 switch (expr->kind) {
1347 case EXPR_REFERENCE: {
1348 entity_t *const entity = expr->reference.entity;
1349 /* we should only find variables as lvalues... */
1350 if (entity->base.kind != ENTITY_VARIABLE
1351 && entity->base.kind != ENTITY_PARAMETER)
1357 case EXPR_ARRAY_ACCESS: {
1358 expression_t *const ref = expr->array_access.array_ref;
1359 entity_t * ent = NULL;
1360 if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1361 ent = determine_lhs_ent(ref, lhs_ent);
1364 mark_vars_read(expr->select.compound, lhs_ent);
1366 mark_vars_read(expr->array_access.index, lhs_ent);
1371 if (is_type_compound(skip_typeref(expr->base.type))) {
1372 return determine_lhs_ent(expr->select.compound, lhs_ent);
1374 mark_vars_read(expr->select.compound, lhs_ent);
1379 case EXPR_UNARY_DEREFERENCE: {
1380 expression_t *const val = expr->unary.value;
1381 if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1383 return determine_lhs_ent(val->unary.value, lhs_ent);
1385 mark_vars_read(val, NULL);
1391 mark_vars_read(expr, NULL);
1396 #define ENT_ANY ((entity_t*)-1)
1399 * Mark declarations, which are read. This is used to detect variables, which
1403 * x is not marked as "read", because it is only read to calculate its own new
1407 * x and y are not detected as "not read", because multiple variables are
1410 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
1412 switch (expr->kind) {
1413 case EXPR_REFERENCE: {
1414 entity_t *const entity = expr->reference.entity;
1415 if (entity->kind != ENTITY_VARIABLE
1416 && entity->kind != ENTITY_PARAMETER)
1419 if (lhs_ent != entity && lhs_ent != ENT_ANY) {
1420 if (entity->kind == ENTITY_VARIABLE) {
1421 entity->variable.read = true;
1423 entity->parameter.read = true;
1430 // TODO respect pure/const
1431 mark_vars_read(expr->call.function, NULL);
1432 for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
1433 mark_vars_read(arg->expression, NULL);
1437 case EXPR_CONDITIONAL:
1438 // TODO lhs_decl should depend on whether true/false have an effect
1439 mark_vars_read(expr->conditional.condition, NULL);
1440 if (expr->conditional.true_expression != NULL)
1441 mark_vars_read(expr->conditional.true_expression, lhs_ent);
1442 mark_vars_read(expr->conditional.false_expression, lhs_ent);
1446 if (lhs_ent == ENT_ANY
1447 && !is_type_compound(skip_typeref(expr->base.type)))
1449 mark_vars_read(expr->select.compound, lhs_ent);
1452 case EXPR_ARRAY_ACCESS: {
1453 expression_t *const ref = expr->array_access.array_ref;
1454 mark_vars_read(ref, lhs_ent);
1455 lhs_ent = determine_lhs_ent(ref, lhs_ent);
1456 mark_vars_read(expr->array_access.index, lhs_ent);
1461 mark_vars_read(expr->va_arge.ap, lhs_ent);
1465 mark_vars_read(expr->va_copye.src, lhs_ent);
1468 case EXPR_UNARY_CAST:
1469 /* Special case: Use void cast to mark a variable as "read" */
1470 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
1475 case EXPR_UNARY_THROW:
1476 if (expr->unary.value == NULL)
1479 case EXPR_UNARY_DEREFERENCE:
1480 case EXPR_UNARY_DELETE:
1481 case EXPR_UNARY_DELETE_ARRAY:
1482 if (lhs_ent == ENT_ANY)
1486 case EXPR_UNARY_NEGATE:
1487 case EXPR_UNARY_PLUS:
1488 case EXPR_UNARY_BITWISE_NEGATE:
1489 case EXPR_UNARY_NOT:
1490 case EXPR_UNARY_TAKE_ADDRESS:
1491 case EXPR_UNARY_POSTFIX_INCREMENT:
1492 case EXPR_UNARY_POSTFIX_DECREMENT:
1493 case EXPR_UNARY_PREFIX_INCREMENT:
1494 case EXPR_UNARY_PREFIX_DECREMENT:
1495 case EXPR_UNARY_CAST_IMPLICIT:
1496 case EXPR_UNARY_ASSUME:
1498 mark_vars_read(expr->unary.value, lhs_ent);
1501 case EXPR_BINARY_ADD:
1502 case EXPR_BINARY_SUB:
1503 case EXPR_BINARY_MUL:
1504 case EXPR_BINARY_DIV:
1505 case EXPR_BINARY_MOD:
1506 case EXPR_BINARY_EQUAL:
1507 case EXPR_BINARY_NOTEQUAL:
1508 case EXPR_BINARY_LESS:
1509 case EXPR_BINARY_LESSEQUAL:
1510 case EXPR_BINARY_GREATER:
1511 case EXPR_BINARY_GREATEREQUAL:
1512 case EXPR_BINARY_BITWISE_AND:
1513 case EXPR_BINARY_BITWISE_OR:
1514 case EXPR_BINARY_BITWISE_XOR:
1515 case EXPR_BINARY_LOGICAL_AND:
1516 case EXPR_BINARY_LOGICAL_OR:
1517 case EXPR_BINARY_SHIFTLEFT:
1518 case EXPR_BINARY_SHIFTRIGHT:
1519 case EXPR_BINARY_COMMA:
1520 case EXPR_BINARY_ISGREATER:
1521 case EXPR_BINARY_ISGREATEREQUAL:
1522 case EXPR_BINARY_ISLESS:
1523 case EXPR_BINARY_ISLESSEQUAL:
1524 case EXPR_BINARY_ISLESSGREATER:
1525 case EXPR_BINARY_ISUNORDERED:
1526 mark_vars_read(expr->binary.left, lhs_ent);
1527 mark_vars_read(expr->binary.right, lhs_ent);
1530 case EXPR_BINARY_ASSIGN:
1531 case EXPR_BINARY_MUL_ASSIGN:
1532 case EXPR_BINARY_DIV_ASSIGN:
1533 case EXPR_BINARY_MOD_ASSIGN:
1534 case EXPR_BINARY_ADD_ASSIGN:
1535 case EXPR_BINARY_SUB_ASSIGN:
1536 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1537 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1538 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1539 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1540 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
1541 if (lhs_ent == ENT_ANY)
1543 lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
1544 mark_vars_read(expr->binary.right, lhs_ent);
1549 determine_lhs_ent(expr->va_starte.ap, lhs_ent);
1555 case EXPR_STRING_LITERAL:
1556 case EXPR_WIDE_STRING_LITERAL:
1557 case EXPR_COMPOUND_LITERAL: // TODO init?
1559 case EXPR_CLASSIFY_TYPE:
1562 case EXPR_BUILTIN_CONSTANT_P:
1563 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1565 case EXPR_STATEMENT: // TODO
1566 case EXPR_LABEL_ADDRESS:
1567 case EXPR_REFERENCE_ENUM_VALUE:
1571 panic("unhandled expression");
1574 static designator_t *parse_designation(void)
1576 designator_t *result = NULL;
1577 designator_t **anchor = &result;
1580 designator_t *designator;
1581 switch (token.type) {
1583 designator = allocate_ast_zero(sizeof(designator[0]));
1584 designator->source_position = token.source_position;
1586 add_anchor_token(']');
1587 designator->array_index = parse_constant_expression();
1588 rem_anchor_token(']');
1589 expect(']', end_error);
1592 designator = allocate_ast_zero(sizeof(designator[0]));
1593 designator->source_position = token.source_position;
1595 if (token.type != T_IDENTIFIER) {
1596 parse_error_expected("while parsing designator",
1597 T_IDENTIFIER, NULL);
1600 designator->symbol = token.symbol;
1604 expect('=', end_error);
1608 assert(designator != NULL);
1609 *anchor = designator;
1610 anchor = &designator->next;
1616 static initializer_t *initializer_from_string(array_type_t *const type,
1617 const string_t *const string)
1619 /* TODO: check len vs. size of array type */
1622 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1623 initializer->string.string = *string;
1628 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1629 const string_t *const string)
1631 /* TODO: check len vs. size of array type */
1634 initializer_t *const initializer =
1635 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1636 initializer->wide_string.string = *string;
1642 * Build an initializer from a given expression.
1644 static initializer_t *initializer_from_expression(type_t *orig_type,
1645 expression_t *expression)
1647 /* TODO check that expression is a constant expression */
1649 /* §6.7.8.14/15 char array may be initialized by string literals */
1650 type_t *type = skip_typeref(orig_type);
1651 type_t *expr_type_orig = expression->base.type;
1652 type_t *expr_type = skip_typeref(expr_type_orig);
1654 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1655 array_type_t *const array_type = &type->array;
1656 type_t *const element_type = skip_typeref(array_type->element_type);
1658 if (element_type->kind == TYPE_ATOMIC) {
1659 atomic_type_kind_t akind = element_type->atomic.akind;
1660 switch (expression->kind) {
1661 case EXPR_STRING_LITERAL:
1662 if (akind == ATOMIC_TYPE_CHAR
1663 || akind == ATOMIC_TYPE_SCHAR
1664 || akind == ATOMIC_TYPE_UCHAR) {
1665 return initializer_from_string(array_type,
1666 &expression->string_literal.value);
1670 case EXPR_WIDE_STRING_LITERAL: {
1671 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1672 if (get_unqualified_type(element_type) == bare_wchar_type) {
1673 return initializer_from_wide_string(array_type,
1674 &expression->string_literal.value);
1685 assign_error_t error = semantic_assign(type, expression);
1686 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1688 report_assign_error(error, type, expression, "initializer",
1689 &expression->base.source_position);
1691 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1692 result->value.value = create_implicit_cast(expression, type);
1698 * Checks if a given expression can be used as a constant initializer.
1700 static bool is_initializer_constant(const expression_t *expression)
1702 return is_constant_expression(expression) != EXPR_CLASS_VARIABLE ||
1703 is_linker_constant(expression) != EXPR_CLASS_VARIABLE;
1707 * Parses an scalar initializer.
1709 * §6.7.8.11; eat {} without warning
1711 static initializer_t *parse_scalar_initializer(type_t *type,
1712 bool must_be_constant)
1714 /* there might be extra {} hierarchies */
1716 if (token.type == '{') {
1717 warningf(WARN_OTHER, HERE, "extra curly braces around scalar initializer");
1721 } while (token.type == '{');
1724 expression_t *expression = parse_assignment_expression();
1725 mark_vars_read(expression, NULL);
1726 if (must_be_constant && !is_initializer_constant(expression)) {
1727 errorf(&expression->base.source_position,
1728 "initialisation expression '%E' is not constant",
1732 initializer_t *initializer = initializer_from_expression(type, expression);
1734 if (initializer == NULL) {
1735 errorf(&expression->base.source_position,
1736 "expression '%E' (type '%T') doesn't match expected type '%T'",
1737 expression, expression->base.type, type);
1742 bool additional_warning_displayed = false;
1743 while (braces > 0) {
1745 if (token.type != '}') {
1746 if (!additional_warning_displayed) {
1747 warningf(WARN_OTHER, HERE, "additional elements in scalar initializer");
1748 additional_warning_displayed = true;
1759 * An entry in the type path.
1761 typedef struct type_path_entry_t type_path_entry_t;
1762 struct type_path_entry_t {
1763 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
1765 size_t index; /**< For array types: the current index. */
1766 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1771 * A type path expression a position inside compound or array types.
1773 typedef struct type_path_t type_path_t;
1774 struct type_path_t {
1775 type_path_entry_t *path; /**< An flexible array containing the current path. */
1776 type_t *top_type; /**< type of the element the path points */
1777 size_t max_index; /**< largest index in outermost array */
1781 * Prints a type path for debugging.
1783 static __attribute__((unused)) void debug_print_type_path(
1784 const type_path_t *path)
1786 size_t len = ARR_LEN(path->path);
1788 for (size_t i = 0; i < len; ++i) {
1789 const type_path_entry_t *entry = & path->path[i];
1791 type_t *type = skip_typeref(entry->type);
1792 if (is_type_compound(type)) {
1793 /* in gcc mode structs can have no members */
1794 if (entry->v.compound_entry == NULL) {
1798 fprintf(stderr, ".%s",
1799 entry->v.compound_entry->base.symbol->string);
1800 } else if (is_type_array(type)) {
1801 fprintf(stderr, "[%u]", (unsigned) entry->v.index);
1803 fprintf(stderr, "-INVALID-");
1806 if (path->top_type != NULL) {
1807 fprintf(stderr, " (");
1808 print_type(path->top_type);
1809 fprintf(stderr, ")");
1814 * Return the top type path entry, ie. in a path
1815 * (type).a.b returns the b.
1817 static type_path_entry_t *get_type_path_top(const type_path_t *path)
1819 size_t len = ARR_LEN(path->path);
1821 return &path->path[len-1];
1825 * Enlarge the type path by an (empty) element.
1827 static type_path_entry_t *append_to_type_path(type_path_t *path)
1829 size_t len = ARR_LEN(path->path);
1830 ARR_RESIZE(type_path_entry_t, path->path, len+1);
1832 type_path_entry_t *result = & path->path[len];
1833 memset(result, 0, sizeof(result[0]));
1838 * Descending into a sub-type. Enter the scope of the current top_type.
1840 static void descend_into_subtype(type_path_t *path)
1842 type_t *orig_top_type = path->top_type;
1843 type_t *top_type = skip_typeref(orig_top_type);
1845 type_path_entry_t *top = append_to_type_path(path);
1846 top->type = top_type;
1848 if (is_type_compound(top_type)) {
1849 compound_t *compound = top_type->compound.compound;
1850 entity_t *entry = compound->members.entities;
1852 if (entry != NULL) {
1853 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
1854 top->v.compound_entry = &entry->declaration;
1855 path->top_type = entry->declaration.type;
1857 path->top_type = NULL;
1859 } else if (is_type_array(top_type)) {
1861 path->top_type = top_type->array.element_type;
1863 assert(!is_type_valid(top_type));
1868 * Pop an entry from the given type path, ie. returning from
1869 * (type).a.b to (type).a
1871 static void ascend_from_subtype(type_path_t *path)
1873 type_path_entry_t *top = get_type_path_top(path);
1875 path->top_type = top->type;
1877 size_t len = ARR_LEN(path->path);
1878 ARR_RESIZE(type_path_entry_t, path->path, len-1);
1882 * Pop entries from the given type path until the given
1883 * path level is reached.
1885 static void ascend_to(type_path_t *path, size_t top_path_level)
1887 size_t len = ARR_LEN(path->path);
1889 while (len > top_path_level) {
1890 ascend_from_subtype(path);
1891 len = ARR_LEN(path->path);
1895 static bool walk_designator(type_path_t *path, const designator_t *designator,
1896 bool used_in_offsetof)
1898 for (; designator != NULL; designator = designator->next) {
1899 type_path_entry_t *top = get_type_path_top(path);
1900 type_t *orig_type = top->type;
1902 type_t *type = skip_typeref(orig_type);
1904 if (designator->symbol != NULL) {
1905 symbol_t *symbol = designator->symbol;
1906 if (!is_type_compound(type)) {
1907 if (is_type_valid(type)) {
1908 errorf(&designator->source_position,
1909 "'.%Y' designator used for non-compound type '%T'",
1913 top->type = type_error_type;
1914 top->v.compound_entry = NULL;
1915 orig_type = type_error_type;
1917 compound_t *compound = type->compound.compound;
1918 entity_t *iter = compound->members.entities;
1919 for (; iter != NULL; iter = iter->base.next) {
1920 if (iter->base.symbol == symbol) {
1925 errorf(&designator->source_position,
1926 "'%T' has no member named '%Y'", orig_type, symbol);
1929 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
1930 if (used_in_offsetof) {
1931 type_t *real_type = skip_typeref(iter->declaration.type);
1932 if (real_type->kind == TYPE_BITFIELD) {
1933 errorf(&designator->source_position,
1934 "offsetof designator '%Y' must not specify bitfield",
1940 top->type = orig_type;
1941 top->v.compound_entry = &iter->declaration;
1942 orig_type = iter->declaration.type;
1945 expression_t *array_index = designator->array_index;
1946 assert(designator->array_index != NULL);
1948 if (!is_type_array(type)) {
1949 if (is_type_valid(type)) {
1950 errorf(&designator->source_position,
1951 "[%E] designator used for non-array type '%T'",
1952 array_index, orig_type);
1957 long index = fold_constant_to_int(array_index);
1958 if (!used_in_offsetof) {
1960 errorf(&designator->source_position,
1961 "array index [%E] must be positive", array_index);
1962 } else if (type->array.size_constant) {
1963 long array_size = type->array.size;
1964 if (index >= array_size) {
1965 errorf(&designator->source_position,
1966 "designator [%E] (%d) exceeds array size %d",
1967 array_index, index, array_size);
1972 top->type = orig_type;
1973 top->v.index = (size_t) index;
1974 orig_type = type->array.element_type;
1976 path->top_type = orig_type;
1978 if (designator->next != NULL) {
1979 descend_into_subtype(path);
1985 static void advance_current_object(type_path_t *path, size_t top_path_level)
1987 type_path_entry_t *top = get_type_path_top(path);
1989 type_t *type = skip_typeref(top->type);
1990 if (is_type_union(type)) {
1991 /* in unions only the first element is initialized */
1992 top->v.compound_entry = NULL;
1993 } else if (is_type_struct(type)) {
1994 declaration_t *entry = top->v.compound_entry;
1996 entity_t *next_entity = entry->base.next;
1997 if (next_entity != NULL) {
1998 assert(is_declaration(next_entity));
1999 entry = &next_entity->declaration;
2004 top->v.compound_entry = entry;
2005 if (entry != NULL) {
2006 path->top_type = entry->type;
2009 } else if (is_type_array(type)) {
2010 assert(is_type_array(type));
2014 if (!type->array.size_constant || top->v.index < type->array.size) {
2018 assert(!is_type_valid(type));
2022 /* we're past the last member of the current sub-aggregate, try if we
2023 * can ascend in the type hierarchy and continue with another subobject */
2024 size_t len = ARR_LEN(path->path);
2026 if (len > top_path_level) {
2027 ascend_from_subtype(path);
2028 advance_current_object(path, top_path_level);
2030 path->top_type = NULL;
2035 * skip any {...} blocks until a closing bracket is reached.
2037 static void skip_initializers(void)
2041 while (token.type != '}') {
2042 if (token.type == T_EOF)
2044 if (token.type == '{') {
2052 static initializer_t *create_empty_initializer(void)
2054 static initializer_t empty_initializer
2055 = { .list = { { INITIALIZER_LIST }, 0 } };
2056 return &empty_initializer;
2060 * Parse a part of an initialiser for a struct or union,
2062 static initializer_t *parse_sub_initializer(type_path_t *path,
2063 type_t *outer_type, size_t top_path_level,
2064 parse_initializer_env_t *env)
2066 if (token.type == '}') {
2067 /* empty initializer */
2068 return create_empty_initializer();
2071 type_t *orig_type = path->top_type;
2072 type_t *type = NULL;
2074 if (orig_type == NULL) {
2075 /* We are initializing an empty compound. */
2077 type = skip_typeref(orig_type);
2080 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2083 designator_t *designator = NULL;
2084 if (token.type == '.' || token.type == '[') {
2085 designator = parse_designation();
2086 goto finish_designator;
2087 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2088 /* GNU-style designator ("identifier: value") */
2089 designator = allocate_ast_zero(sizeof(designator[0]));
2090 designator->source_position = token.source_position;
2091 designator->symbol = token.symbol;
2096 /* reset path to toplevel, evaluate designator from there */
2097 ascend_to(path, top_path_level);
2098 if (!walk_designator(path, designator, false)) {
2099 /* can't continue after designation error */
2103 initializer_t *designator_initializer
2104 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2105 designator_initializer->designator.designator = designator;
2106 ARR_APP1(initializer_t*, initializers, designator_initializer);
2108 orig_type = path->top_type;
2109 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2114 if (token.type == '{') {
2115 if (type != NULL && is_type_scalar(type)) {
2116 sub = parse_scalar_initializer(type, env->must_be_constant);
2119 if (env->entity != NULL) {
2121 "extra brace group at end of initializer for '%Y'",
2122 env->entity->base.symbol);
2124 errorf(HERE, "extra brace group at end of initializer");
2129 descend_into_subtype(path);
2132 add_anchor_token('}');
2133 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2135 rem_anchor_token('}');
2138 ascend_from_subtype(path);
2139 expect('}', end_error);
2141 expect('}', end_error);
2142 goto error_parse_next;
2146 /* must be an expression */
2147 expression_t *expression = parse_assignment_expression();
2148 mark_vars_read(expression, NULL);
2150 if (env->must_be_constant && !is_initializer_constant(expression)) {
2151 errorf(&expression->base.source_position,
2152 "Initialisation expression '%E' is not constant",
2157 /* we are already outside, ... */
2158 if (outer_type == NULL)
2159 goto error_parse_next;
2160 type_t *const outer_type_skip = skip_typeref(outer_type);
2161 if (is_type_compound(outer_type_skip) &&
2162 !outer_type_skip->compound.compound->complete) {
2163 goto error_parse_next;
2166 source_position_t const* const pos = &expression->base.source_position;
2167 if (env->entity != NULL) {
2168 warningf(WARN_OTHER, pos, "excess elements in initializer for '%Y'", env->entity->base.symbol);
2170 warningf(WARN_OTHER, pos, "excess elements in initializer");
2172 goto error_parse_next;
2175 /* handle { "string" } special case */
2176 if ((expression->kind == EXPR_STRING_LITERAL
2177 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2178 && outer_type != NULL) {
2179 sub = initializer_from_expression(outer_type, expression);
2182 if (token.type != '}') {
2183 warningf(WARN_OTHER, HERE, "excessive elements in initializer for type '%T'", orig_type);
2185 /* TODO: eat , ... */
2190 /* descend into subtypes until expression matches type */
2192 orig_type = path->top_type;
2193 type = skip_typeref(orig_type);
2195 sub = initializer_from_expression(orig_type, expression);
2199 if (!is_type_valid(type)) {
2202 if (is_type_scalar(type)) {
2203 errorf(&expression->base.source_position,
2204 "expression '%E' doesn't match expected type '%T'",
2205 expression, orig_type);
2209 descend_into_subtype(path);
2213 /* update largest index of top array */
2214 const type_path_entry_t *first = &path->path[0];
2215 type_t *first_type = first->type;
2216 first_type = skip_typeref(first_type);
2217 if (is_type_array(first_type)) {
2218 size_t index = first->v.index;
2219 if (index > path->max_index)
2220 path->max_index = index;
2223 /* append to initializers list */
2224 ARR_APP1(initializer_t*, initializers, sub);
2227 if (token.type == '}') {
2230 expect(',', end_error);
2231 if (token.type == '}') {
2236 /* advance to the next declaration if we are not at the end */
2237 advance_current_object(path, top_path_level);
2238 orig_type = path->top_type;
2239 if (orig_type != NULL)
2240 type = skip_typeref(orig_type);
2246 size_t len = ARR_LEN(initializers);
2247 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2248 initializer_t *result = allocate_ast_zero(size);
2249 result->kind = INITIALIZER_LIST;
2250 result->list.len = len;
2251 memcpy(&result->list.initializers, initializers,
2252 len * sizeof(initializers[0]));
2254 DEL_ARR_F(initializers);
2255 ascend_to(path, top_path_level+1);
2260 skip_initializers();
2261 DEL_ARR_F(initializers);
2262 ascend_to(path, top_path_level+1);
2266 static expression_t *make_size_literal(size_t value)
2268 expression_t *literal = allocate_expression_zero(EXPR_LITERAL_INTEGER);
2269 literal->base.type = type_size_t;
2272 snprintf(buf, sizeof(buf), "%u", (unsigned) value);
2273 literal->literal.value = make_string(buf);
2279 * Parses an initializer. Parsers either a compound literal
2280 * (env->declaration == NULL) or an initializer of a declaration.
2282 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2284 type_t *type = skip_typeref(env->type);
2285 size_t max_index = 0;
2286 initializer_t *result;
2288 if (is_type_scalar(type)) {
2289 result = parse_scalar_initializer(type, env->must_be_constant);
2290 } else if (token.type == '{') {
2294 memset(&path, 0, sizeof(path));
2295 path.top_type = env->type;
2296 path.path = NEW_ARR_F(type_path_entry_t, 0);
2298 descend_into_subtype(&path);
2300 add_anchor_token('}');
2301 result = parse_sub_initializer(&path, env->type, 1, env);
2302 rem_anchor_token('}');
2304 max_index = path.max_index;
2305 DEL_ARR_F(path.path);
2307 expect('}', end_error);
2310 /* parse_scalar_initializer() also works in this case: we simply
2311 * have an expression without {} around it */
2312 result = parse_scalar_initializer(type, env->must_be_constant);
2315 /* §6.7.8:22 array initializers for arrays with unknown size determine
2316 * the array type size */
2317 if (is_type_array(type) && type->array.size_expression == NULL
2318 && result != NULL) {
2320 switch (result->kind) {
2321 case INITIALIZER_LIST:
2322 assert(max_index != 0xdeadbeaf);
2323 size = max_index + 1;
2326 case INITIALIZER_STRING:
2327 size = result->string.string.size;
2330 case INITIALIZER_WIDE_STRING:
2331 size = result->wide_string.string.size;
2334 case INITIALIZER_DESIGNATOR:
2335 case INITIALIZER_VALUE:
2336 /* can happen for parse errors */
2341 internal_errorf(HERE, "invalid initializer type");
2344 type_t *new_type = duplicate_type(type);
2346 new_type->array.size_expression = make_size_literal(size);
2347 new_type->array.size_constant = true;
2348 new_type->array.has_implicit_size = true;
2349 new_type->array.size = size;
2350 env->type = new_type;
2356 static void append_entity(scope_t *scope, entity_t *entity)
2358 if (scope->last_entity != NULL) {
2359 scope->last_entity->base.next = entity;
2361 scope->entities = entity;
2363 entity->base.parent_entity = current_entity;
2364 scope->last_entity = entity;
2368 static compound_t *parse_compound_type_specifier(bool is_struct)
2370 source_position_t const pos = *HERE;
2371 eat(is_struct ? T_struct : T_union);
2373 symbol_t *symbol = NULL;
2374 entity_t *entity = NULL;
2375 attribute_t *attributes = NULL;
2377 if (token.type == T___attribute__) {
2378 attributes = parse_attributes(NULL);
2381 entity_kind_tag_t const kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
2382 if (token.type == T_IDENTIFIER) {
2383 /* the compound has a name, check if we have seen it already */
2384 symbol = token.symbol;
2385 entity = get_tag(symbol, kind);
2388 if (entity != NULL) {
2389 if (entity->base.parent_scope != current_scope &&
2390 (token.type == '{' || token.type == ';')) {
2391 /* we're in an inner scope and have a definition. Shadow
2392 * existing definition in outer scope */
2394 } else if (entity->compound.complete && token.type == '{') {
2395 source_position_t const *const ppos = &entity->base.source_position;
2396 errorf(&pos, "multiple definitions of '%N' (previous definition %P)", entity, ppos);
2397 /* clear members in the hope to avoid further errors */
2398 entity->compound.members.entities = NULL;
2401 } else if (token.type != '{') {
2402 char const *const msg =
2403 is_struct ? "while parsing struct type specifier" :
2404 "while parsing union type specifier";
2405 parse_error_expected(msg, T_IDENTIFIER, '{', NULL);
2410 if (entity == NULL) {
2411 entity = allocate_entity_zero(kind, NAMESPACE_TAG, symbol);
2412 entity->compound.alignment = 1;
2413 entity->base.source_position = pos;
2414 entity->base.parent_scope = current_scope;
2415 if (symbol != NULL) {
2416 environment_push(entity);
2418 append_entity(current_scope, entity);
2421 if (token.type == '{') {
2422 parse_compound_type_entries(&entity->compound);
2424 /* ISO/IEC 14882:1998(E) §7.1.3:5 */
2425 if (symbol == NULL) {
2426 assert(anonymous_entity == NULL);
2427 anonymous_entity = entity;
2431 if (attributes != NULL) {
2432 handle_entity_attributes(attributes, entity);
2435 return &entity->compound;
2438 static void parse_enum_entries(type_t *const enum_type)
2442 if (token.type == '}') {
2443 errorf(HERE, "empty enum not allowed");
2448 add_anchor_token('}');
2450 if (token.type != T_IDENTIFIER) {
2451 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2453 rem_anchor_token('}');
2457 entity_t *const entity = allocate_entity_zero(ENTITY_ENUM_VALUE, NAMESPACE_NORMAL, token.symbol);
2458 entity->enum_value.enum_type = enum_type;
2459 entity->base.source_position = token.source_position;
2463 expression_t *value = parse_constant_expression();
2465 value = create_implicit_cast(value, enum_type);
2466 entity->enum_value.value = value;
2471 record_entity(entity, false);
2472 } while (next_if(',') && token.type != '}');
2473 rem_anchor_token('}');
2475 expect('}', end_error);
2481 static type_t *parse_enum_specifier(void)
2483 source_position_t const pos = *HERE;
2488 switch (token.type) {
2490 symbol = token.symbol;
2491 entity = get_tag(symbol, ENTITY_ENUM);
2494 if (entity != NULL) {
2495 if (entity->base.parent_scope != current_scope &&
2496 (token.type == '{' || token.type == ';')) {
2497 /* we're in an inner scope and have a definition. Shadow
2498 * existing definition in outer scope */
2500 } else if (entity->enume.complete && token.type == '{') {
2501 source_position_t const *const ppos = &entity->base.source_position;
2502 errorf(&pos, "multiple definitions of '%N' (previous definition %P)", entity, ppos);
2513 parse_error_expected("while parsing enum type specifier",
2514 T_IDENTIFIER, '{', NULL);
2518 if (entity == NULL) {
2519 entity = allocate_entity_zero(ENTITY_ENUM, NAMESPACE_TAG, symbol);
2520 entity->base.source_position = pos;
2521 entity->base.parent_scope = current_scope;
2524 type_t *const type = allocate_type_zero(TYPE_ENUM);
2525 type->enumt.enume = &entity->enume;
2526 type->enumt.akind = ATOMIC_TYPE_INT;
2528 if (token.type == '{') {
2529 if (symbol != NULL) {
2530 environment_push(entity);
2532 append_entity(current_scope, entity);
2533 entity->enume.complete = true;
2535 parse_enum_entries(type);
2536 parse_attributes(NULL);
2538 /* ISO/IEC 14882:1998(E) §7.1.3:5 */
2539 if (symbol == NULL) {
2540 assert(anonymous_entity == NULL);
2541 anonymous_entity = entity;
2543 } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
2544 errorf(HERE, "'%T' used before definition (incomplete enums are a GNU extension)", type);
2551 * if a symbol is a typedef to another type, return true
2553 static bool is_typedef_symbol(symbol_t *symbol)
2555 const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
2556 return entity != NULL && entity->kind == ENTITY_TYPEDEF;
2559 static type_t *parse_typeof(void)
2565 expect('(', end_error);
2566 add_anchor_token(')');
2568 expression_t *expression = NULL;
2570 bool old_type_prop = in_type_prop;
2571 bool old_gcc_extension = in_gcc_extension;
2572 in_type_prop = true;
2574 while (next_if(T___extension__)) {
2575 /* This can be a prefix to a typename or an expression. */
2576 in_gcc_extension = true;
2578 switch (token.type) {
2580 if (is_typedef_symbol(token.symbol)) {
2582 type = parse_typename();
2585 expression = parse_expression();
2586 type = revert_automatic_type_conversion(expression);
2590 in_type_prop = old_type_prop;
2591 in_gcc_extension = old_gcc_extension;
2593 rem_anchor_token(')');
2594 expect(')', end_error);
2596 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
2597 typeof_type->typeoft.expression = expression;
2598 typeof_type->typeoft.typeof_type = type;
2605 typedef enum specifiers_t {
2606 SPECIFIER_SIGNED = 1 << 0,
2607 SPECIFIER_UNSIGNED = 1 << 1,
2608 SPECIFIER_LONG = 1 << 2,
2609 SPECIFIER_INT = 1 << 3,
2610 SPECIFIER_DOUBLE = 1 << 4,
2611 SPECIFIER_CHAR = 1 << 5,
2612 SPECIFIER_WCHAR_T = 1 << 6,
2613 SPECIFIER_SHORT = 1 << 7,
2614 SPECIFIER_LONG_LONG = 1 << 8,
2615 SPECIFIER_FLOAT = 1 << 9,
2616 SPECIFIER_BOOL = 1 << 10,
2617 SPECIFIER_VOID = 1 << 11,
2618 SPECIFIER_INT8 = 1 << 12,
2619 SPECIFIER_INT16 = 1 << 13,
2620 SPECIFIER_INT32 = 1 << 14,
2621 SPECIFIER_INT64 = 1 << 15,
2622 SPECIFIER_INT128 = 1 << 16,
2623 SPECIFIER_COMPLEX = 1 << 17,
2624 SPECIFIER_IMAGINARY = 1 << 18,
2627 static type_t *get_typedef_type(symbol_t *symbol)
2629 entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
2630 if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
2633 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
2634 type->typedeft.typedefe = &entity->typedefe;
2639 static attribute_t *parse_attribute_ms_property(attribute_t *attribute)
2641 expect('(', end_error);
2643 attribute_property_argument_t *property
2644 = allocate_ast_zero(sizeof(*property));
2647 if (token.type != T_IDENTIFIER) {
2648 parse_error_expected("while parsing property declspec",
2649 T_IDENTIFIER, NULL);
2654 symbol_t *symbol = token.symbol;
2655 if (strcmp(symbol->string, "put") == 0) {
2656 prop = &property->put_symbol;
2657 } else if (strcmp(symbol->string, "get") == 0) {
2658 prop = &property->get_symbol;
2660 errorf(HERE, "expected put or get in property declspec");
2664 expect('=', end_error);
2665 if (token.type != T_IDENTIFIER) {
2666 parse_error_expected("while parsing property declspec",
2667 T_IDENTIFIER, NULL);
2671 *prop = token.symbol;
2673 } while (next_if(','));
2675 attribute->a.property = property;
2677 expect(')', end_error);
2683 static attribute_t *parse_microsoft_extended_decl_modifier_single(void)
2685 attribute_kind_t kind = ATTRIBUTE_UNKNOWN;
2686 if (next_if(T_restrict)) {
2687 kind = ATTRIBUTE_MS_RESTRICT;
2688 } else if (token.type == T_IDENTIFIER) {
2689 const char *name = token.symbol->string;
2690 for (attribute_kind_t k = ATTRIBUTE_MS_FIRST; k <= ATTRIBUTE_MS_LAST;
2692 const char *attribute_name = get_attribute_name(k);
2693 if (attribute_name != NULL && strcmp(attribute_name, name) == 0) {
2699 if (kind == ATTRIBUTE_UNKNOWN) {
2700 warningf(WARN_ATTRIBUTE, HERE, "unknown __declspec '%s' ignored", name);
2703 parse_error_expected("while parsing __declspec", T_IDENTIFIER, NULL);
2707 attribute_t *attribute = allocate_attribute_zero(kind);
2710 if (kind == ATTRIBUTE_MS_PROPERTY) {
2711 return parse_attribute_ms_property(attribute);
2714 /* parse arguments */
2716 attribute->a.arguments = parse_attribute_arguments();
2721 static attribute_t *parse_microsoft_extended_decl_modifier(attribute_t *first)
2725 expect('(', end_error);
2730 add_anchor_token(')');
2732 attribute_t **anchor = &first;
2734 while (*anchor != NULL)
2735 anchor = &(*anchor)->next;
2737 attribute_t *attribute
2738 = parse_microsoft_extended_decl_modifier_single();
2739 if (attribute == NULL)
2742 *anchor = attribute;
2743 anchor = &attribute->next;
2744 } while (next_if(','));
2746 rem_anchor_token(')');
2747 expect(')', end_error);
2751 rem_anchor_token(')');
2755 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
2757 entity_t *const entity = allocate_entity_zero(kind, NAMESPACE_NORMAL, symbol);
2758 entity->base.source_position = *HERE;
2759 if (is_declaration(entity)) {
2760 entity->declaration.type = type_error_type;
2761 entity->declaration.implicit = true;
2762 } else if (kind == ENTITY_TYPEDEF) {
2763 entity->typedefe.type = type_error_type;
2764 entity->typedefe.builtin = true;
2766 if (kind != ENTITY_COMPOUND_MEMBER)
2767 record_entity(entity, false);
2771 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
2773 type_t *type = NULL;
2774 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
2775 unsigned type_specifiers = 0;
2776 bool newtype = false;
2777 bool saw_error = false;
2778 bool old_gcc_extension = in_gcc_extension;
2780 memset(specifiers, 0, sizeof(*specifiers));
2781 specifiers->source_position = token.source_position;
2784 specifiers->attributes = parse_attributes(specifiers->attributes);
2786 switch (token.type) {
2788 #define MATCH_STORAGE_CLASS(token, class) \
2790 if (specifiers->storage_class != STORAGE_CLASS_NONE) { \
2791 errorf(HERE, "multiple storage classes in declaration specifiers"); \
2793 specifiers->storage_class = class; \
2794 if (specifiers->thread_local) \
2795 goto check_thread_storage_class; \
2799 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
2800 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
2801 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
2802 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
2803 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
2806 specifiers->attributes
2807 = parse_microsoft_extended_decl_modifier(specifiers->attributes);
2811 if (specifiers->thread_local) {
2812 errorf(HERE, "duplicate '__thread'");
2814 specifiers->thread_local = true;
2815 check_thread_storage_class:
2816 switch (specifiers->storage_class) {
2817 case STORAGE_CLASS_EXTERN:
2818 case STORAGE_CLASS_NONE:
2819 case STORAGE_CLASS_STATIC:
2823 case STORAGE_CLASS_AUTO: wrong = "auto"; goto wrong_thread_storage_class;
2824 case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_storage_class;
2825 case STORAGE_CLASS_TYPEDEF: wrong = "typedef"; goto wrong_thread_storage_class;
2826 wrong_thread_storage_class:
2827 errorf(HERE, "'__thread' used with '%s'", wrong);
2834 /* type qualifiers */
2835 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
2837 qualifiers |= qualifier; \
2841 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
2842 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
2843 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
2844 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
2845 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
2846 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
2847 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
2848 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
2850 case T___extension__:
2852 in_gcc_extension = true;
2855 /* type specifiers */
2856 #define MATCH_SPECIFIER(token, specifier, name) \
2858 if (type_specifiers & specifier) { \
2859 errorf(HERE, "multiple " name " type specifiers given"); \
2861 type_specifiers |= specifier; \
2866 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
2867 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
2868 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
2869 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
2870 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
2871 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
2872 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
2873 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
2874 MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool");
2875 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
2876 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
2877 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
2878 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
2879 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
2880 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
2881 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
2882 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
2883 MATCH_SPECIFIER(T_wchar_t, SPECIFIER_WCHAR_T, "wchar_t");
2887 specifiers->is_inline = true;
2891 case T__forceinline:
2893 specifiers->modifiers |= DM_FORCEINLINE;
2898 if (type_specifiers & SPECIFIER_LONG_LONG) {
2899 errorf(HERE, "too many long type specifiers given");
2900 } else if (type_specifiers & SPECIFIER_LONG) {
2901 type_specifiers |= SPECIFIER_LONG_LONG;
2903 type_specifiers |= SPECIFIER_LONG;
2908 #define CHECK_DOUBLE_TYPE() \
2909 (type != NULL ? errorf(HERE, "multiple types in declaration specifiers") : (void)0)
2912 CHECK_DOUBLE_TYPE();
2913 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
2915 type->compound.compound = parse_compound_type_specifier(true);
2918 CHECK_DOUBLE_TYPE();
2919 type = allocate_type_zero(TYPE_COMPOUND_UNION);
2920 type->compound.compound = parse_compound_type_specifier(false);
2923 CHECK_DOUBLE_TYPE();
2924 type = parse_enum_specifier();
2927 CHECK_DOUBLE_TYPE();
2928 type = parse_typeof();
2930 case T___builtin_va_list:
2931 CHECK_DOUBLE_TYPE();
2932 type = duplicate_type(type_valist);
2936 case T_IDENTIFIER: {
2937 /* only parse identifier if we haven't found a type yet */
2938 if (type != NULL || type_specifiers != 0) {
2939 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
2940 * declaration, so it doesn't generate errors about expecting '(' or
2942 switch (look_ahead(1)->type) {
2949 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
2953 errorf(HERE, "discarding stray %K in declaration specifier", &token);
2958 goto finish_specifiers;
2962 type_t *const typedef_type = get_typedef_type(token.symbol);
2963 if (typedef_type == NULL) {
2964 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
2965 * declaration, so it doesn't generate 'implicit int' followed by more
2966 * errors later on. */
2967 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
2973 errorf(HERE, "%K does not name a type", &token);
2976 create_error_entity(token.symbol, ENTITY_TYPEDEF);
2978 type = allocate_type_zero(TYPE_TYPEDEF);
2979 type->typedeft.typedefe = &entity->typedefe;
2987 goto finish_specifiers;
2992 type = typedef_type;
2996 /* function specifier */
2998 goto finish_specifiers;
3003 specifiers->attributes = parse_attributes(specifiers->attributes);
3005 in_gcc_extension = old_gcc_extension;
3007 if (type == NULL || (saw_error && type_specifiers != 0)) {
3008 atomic_type_kind_t atomic_type;
3010 /* match valid basic types */
3011 switch (type_specifiers) {
3012 case SPECIFIER_VOID:
3013 atomic_type = ATOMIC_TYPE_VOID;
3015 case SPECIFIER_WCHAR_T:
3016 atomic_type = ATOMIC_TYPE_WCHAR_T;
3018 case SPECIFIER_CHAR:
3019 atomic_type = ATOMIC_TYPE_CHAR;
3021 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3022 atomic_type = ATOMIC_TYPE_SCHAR;
3024 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3025 atomic_type = ATOMIC_TYPE_UCHAR;
3027 case SPECIFIER_SHORT:
3028 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3029 case SPECIFIER_SHORT | SPECIFIER_INT:
3030 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3031 atomic_type = ATOMIC_TYPE_SHORT;
3033 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3034 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3035 atomic_type = ATOMIC_TYPE_USHORT;
3038 case SPECIFIER_SIGNED:
3039 case SPECIFIER_SIGNED | SPECIFIER_INT:
3040 atomic_type = ATOMIC_TYPE_INT;
3042 case SPECIFIER_UNSIGNED:
3043 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3044 atomic_type = ATOMIC_TYPE_UINT;
3046 case SPECIFIER_LONG:
3047 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3048 case SPECIFIER_LONG | SPECIFIER_INT:
3049 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3050 atomic_type = ATOMIC_TYPE_LONG;
3052 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3053 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3054 atomic_type = ATOMIC_TYPE_ULONG;
3057 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3058 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3059 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3060 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3062 atomic_type = ATOMIC_TYPE_LONGLONG;
3063 goto warn_about_long_long;
3065 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3066 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3068 atomic_type = ATOMIC_TYPE_ULONGLONG;
3069 warn_about_long_long:
3070 warningf(WARN_LONG_LONG, &specifiers->source_position, "ISO C90 does not support 'long long'");
3073 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3074 atomic_type = unsigned_int8_type_kind;
3077 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3078 atomic_type = unsigned_int16_type_kind;
3081 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3082 atomic_type = unsigned_int32_type_kind;
3085 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3086 atomic_type = unsigned_int64_type_kind;
3089 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3090 atomic_type = unsigned_int128_type_kind;
3093 case SPECIFIER_INT8:
3094 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3095 atomic_type = int8_type_kind;
3098 case SPECIFIER_INT16:
3099 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3100 atomic_type = int16_type_kind;
3103 case SPECIFIER_INT32:
3104 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3105 atomic_type = int32_type_kind;
3108 case SPECIFIER_INT64:
3109 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3110 atomic_type = int64_type_kind;
3113 case SPECIFIER_INT128:
3114 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3115 atomic_type = int128_type_kind;
3118 case SPECIFIER_FLOAT:
3119 atomic_type = ATOMIC_TYPE_FLOAT;
3121 case SPECIFIER_DOUBLE:
3122 atomic_type = ATOMIC_TYPE_DOUBLE;
3124 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3125 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3127 case SPECIFIER_BOOL:
3128 atomic_type = ATOMIC_TYPE_BOOL;
3130 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3131 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3132 atomic_type = ATOMIC_TYPE_FLOAT;
3134 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3135 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3136 atomic_type = ATOMIC_TYPE_DOUBLE;
3138 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3139 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3140 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3143 /* invalid specifier combination, give an error message */
3144 source_position_t const* const pos = &specifiers->source_position;
3145 if (type_specifiers == 0) {
3147 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3148 if (!(c_mode & _CXX) && !strict_mode) {
3149 warningf(WARN_IMPLICIT_INT, pos, "no type specifiers in declaration, using 'int'");
3150 atomic_type = ATOMIC_TYPE_INT;
3153 errorf(pos, "no type specifiers given in declaration");
3156 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3157 (type_specifiers & SPECIFIER_UNSIGNED)) {
3158 errorf(pos, "signed and unsigned specifiers given");
3159 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3160 errorf(pos, "only integer types can be signed or unsigned");
3162 errorf(pos, "multiple datatypes in declaration");
3168 if (type_specifiers & SPECIFIER_COMPLEX) {
3169 type = allocate_type_zero(TYPE_COMPLEX);
3170 type->complex.akind = atomic_type;
3171 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3172 type = allocate_type_zero(TYPE_IMAGINARY);
3173 type->imaginary.akind = atomic_type;
3175 type = allocate_type_zero(TYPE_ATOMIC);
3176 type->atomic.akind = atomic_type;
3179 } else if (type_specifiers != 0) {
3180 errorf(&specifiers->source_position, "multiple datatypes in declaration");
3183 /* FIXME: check type qualifiers here */
3184 type->base.qualifiers = qualifiers;
3187 type = identify_new_type(type);
3189 type = typehash_insert(type);
3192 if (specifiers->attributes != NULL)
3193 type = handle_type_attributes(specifiers->attributes, type);
3194 specifiers->type = type;
3198 specifiers->type = type_error_type;
3201 static type_qualifiers_t parse_type_qualifiers(void)
3203 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3206 switch (token.type) {
3207 /* type qualifiers */
3208 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3209 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3210 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3211 /* microsoft extended type modifiers */
3212 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3213 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3214 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3215 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3216 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3225 * Parses an K&R identifier list
3227 static void parse_identifier_list(scope_t *scope)
3230 entity_t *const entity = allocate_entity_zero(ENTITY_PARAMETER, NAMESPACE_NORMAL, token.symbol);
3231 entity->base.source_position = token.source_position;
3232 /* a K&R parameter has no type, yet */
3236 append_entity(scope, entity);
3237 } while (next_if(',') && token.type == T_IDENTIFIER);
3240 static entity_t *parse_parameter(void)
3242 declaration_specifiers_t specifiers;
3243 parse_declaration_specifiers(&specifiers);
3245 entity_t *entity = parse_declarator(&specifiers,
3246 DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
3247 anonymous_entity = NULL;
3251 static void semantic_parameter_incomplete(const entity_t *entity)
3253 assert(entity->kind == ENTITY_PARAMETER);
3255 /* §6.7.5.3:4 After adjustment, the parameters in a parameter type
3256 * list in a function declarator that is part of a
3257 * definition of that function shall not have
3258 * incomplete type. */
3259 type_t *type = skip_typeref(entity->declaration.type);
3260 if (is_type_incomplete(type)) {
3261 errorf(&entity->base.source_position, "'%N' has incomplete type", entity);
3265 static bool has_parameters(void)
3267 /* func(void) is not a parameter */
3268 if (token.type == T_IDENTIFIER) {
3269 entity_t const *const entity = get_entity(token.symbol, NAMESPACE_NORMAL);
3272 if (entity->kind != ENTITY_TYPEDEF)
3274 if (skip_typeref(entity->typedefe.type) != type_void)
3276 } else if (token.type != T_void) {
3279 if (look_ahead(1)->type != ')')
3286 * Parses function type parameters (and optionally creates variable_t entities
3287 * for them in a scope)
3289 static void parse_parameters(function_type_t *type, scope_t *scope)
3292 add_anchor_token(')');
3293 int saved_comma_state = save_and_reset_anchor_state(',');
3295 if (token.type == T_IDENTIFIER &&
3296 !is_typedef_symbol(token.symbol)) {
3297 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3298 if (la1_type == ',' || la1_type == ')') {
3299 type->kr_style_parameters = true;
3300 parse_identifier_list(scope);
3301 goto parameters_finished;
3305 if (token.type == ')') {
3306 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
3307 if (!(c_mode & _CXX))
3308 type->unspecified_parameters = true;
3309 } else if (has_parameters()) {
3310 function_parameter_t **anchor = &type->parameters;
3312 switch (token.type) {
3315 type->variadic = true;
3316 goto parameters_finished;
3319 case T___extension__:
3322 entity_t *entity = parse_parameter();
3323 if (entity->kind == ENTITY_TYPEDEF) {
3324 errorf(&entity->base.source_position,
3325 "typedef not allowed as function parameter");
3328 assert(is_declaration(entity));
3330 semantic_parameter_incomplete(entity);
3332 function_parameter_t *const parameter =
3333 allocate_parameter(entity->declaration.type);
3335 if (scope != NULL) {
3336 append_entity(scope, entity);
3339 *anchor = parameter;
3340 anchor = ¶meter->next;
3345 goto parameters_finished;
3347 } while (next_if(','));
3350 parameters_finished:
3351 rem_anchor_token(')');
3352 expect(')', end_error);
3355 restore_anchor_state(',', saved_comma_state);
3358 typedef enum construct_type_kind_t {
3361 CONSTRUCT_REFERENCE,
3364 } construct_type_kind_t;
3366 typedef union construct_type_t construct_type_t;
3368 typedef struct construct_type_base_t {
3369 construct_type_kind_t kind;
3370 source_position_t pos;
3371 construct_type_t *next;
3372 } construct_type_base_t;
3374 typedef struct parsed_pointer_t {
3375 construct_type_base_t base;
3376 type_qualifiers_t type_qualifiers;
3377 variable_t *base_variable; /**< MS __based extension. */
3380 typedef struct parsed_reference_t {
3381 construct_type_base_t base;
3382 } parsed_reference_t;
3384 typedef struct construct_function_type_t {
3385 construct_type_base_t base;
3386 type_t *function_type;
3387 } construct_function_type_t;
3389 typedef struct parsed_array_t {
3390 construct_type_base_t base;
3391 type_qualifiers_t type_qualifiers;
3397 union construct_type_t {
3398 construct_type_kind_t kind;
3399 construct_type_base_t base;
3400 parsed_pointer_t pointer;
3401 parsed_reference_t reference;
3402 construct_function_type_t function;
3403 parsed_array_t array;
3406 static construct_type_t *allocate_declarator_zero(construct_type_kind_t const kind, size_t const size)
3408 construct_type_t *const cons = obstack_alloc(&temp_obst, size);
3409 memset(cons, 0, size);
3411 cons->base.pos = *HERE;
3416 static construct_type_t *parse_pointer_declarator(void)
3418 construct_type_t *const cons = allocate_declarator_zero(CONSTRUCT_POINTER, sizeof(parsed_pointer_t));
3420 cons->pointer.type_qualifiers = parse_type_qualifiers();
3421 //cons->pointer.base_variable = base_variable;
3426 /* ISO/IEC 14882:1998(E) §8.3.2 */
3427 static construct_type_t *parse_reference_declarator(void)
3429 if (!(c_mode & _CXX))
3430 errorf(HERE, "references are only available for C++");
3432 construct_type_t *const cons = allocate_declarator_zero(CONSTRUCT_REFERENCE, sizeof(parsed_reference_t));
3439 static construct_type_t *parse_array_declarator(void)
3441 construct_type_t *const cons = allocate_declarator_zero(CONSTRUCT_ARRAY, sizeof(parsed_array_t));
3442 parsed_array_t *const array = &cons->array;
3445 add_anchor_token(']');
3447 bool is_static = next_if(T_static);
3449 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3452 is_static = next_if(T_static);
3454 array->type_qualifiers = type_qualifiers;
3455 array->is_static = is_static;
3457 expression_t *size = NULL;
3458 if (token.type == '*' && look_ahead(1)->type == ']') {
3459 array->is_variable = true;
3461 } else if (token.type != ']') {
3462 size = parse_assignment_expression();
3464 /* §6.7.5.2:1 Array size must have integer type */
3465 type_t *const orig_type = size->base.type;
3466 type_t *const type = skip_typeref(orig_type);
3467 if (!is_type_integer(type) && is_type_valid(type)) {
3468 errorf(&size->base.source_position,
3469 "array size '%E' must have integer type but has type '%T'",
3474 mark_vars_read(size, NULL);
3477 if (is_static && size == NULL)
3478 errorf(&array->base.pos, "static array parameters require a size");
3480 rem_anchor_token(']');
3481 expect(']', end_error);
3488 static construct_type_t *parse_function_declarator(scope_t *scope)
3490 construct_type_t *const cons = allocate_declarator_zero(CONSTRUCT_FUNCTION, sizeof(construct_function_type_t));
3492 type_t *type = allocate_type_zero(TYPE_FUNCTION);
3493 function_type_t *ftype = &type->function;
3495 ftype->linkage = current_linkage;
3496 ftype->calling_convention = CC_DEFAULT;
3498 parse_parameters(ftype, scope);
3500 cons->function.function_type = type;
3505 typedef struct parse_declarator_env_t {
3506 bool may_be_abstract : 1;
3507 bool must_be_abstract : 1;
3508 decl_modifiers_t modifiers;
3510 source_position_t source_position;
3512 attribute_t *attributes;
3513 } parse_declarator_env_t;
3516 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env)
3518 /* construct a single linked list of construct_type_t's which describe
3519 * how to construct the final declarator type */
3520 construct_type_t *first = NULL;
3521 construct_type_t **anchor = &first;
3523 env->attributes = parse_attributes(env->attributes);
3526 construct_type_t *type;
3527 //variable_t *based = NULL; /* MS __based extension */
3528 switch (token.type) {
3530 type = parse_reference_declarator();
3534 panic("based not supported anymore");
3539 type = parse_pointer_declarator();
3543 goto ptr_operator_end;
3547 anchor = &type->base.next;
3549 /* TODO: find out if this is correct */
3550 env->attributes = parse_attributes(env->attributes);
3554 construct_type_t *inner_types = NULL;
3556 switch (token.type) {
3558 if (env->must_be_abstract) {
3559 errorf(HERE, "no identifier expected in typename");
3561 env->symbol = token.symbol;
3562 env->source_position = token.source_position;
3568 /* Parenthesized declarator or function declarator? */
3569 token_t const *const la1 = look_ahead(1);
3570 switch (la1->type) {
3572 if (is_typedef_symbol(la1->symbol)) {
3574 /* §6.7.6:2 footnote 126: Empty parentheses in a type name are
3575 * interpreted as ``function with no parameter specification'', rather
3576 * than redundant parentheses around the omitted identifier. */
3578 /* Function declarator. */
3579 if (!env->may_be_abstract) {
3580 errorf(HERE, "function declarator must have a name");
3587 case T___attribute__: /* FIXME __attribute__ might also introduce a parameter of a function declarator. */
3588 /* Paranthesized declarator. */
3590 add_anchor_token(')');
3591 inner_types = parse_inner_declarator(env);
3592 if (inner_types != NULL) {
3593 /* All later declarators only modify the return type */
3594 env->must_be_abstract = true;
3596 rem_anchor_token(')');
3597 expect(')', end_error);
3605 if (env->may_be_abstract)
3607 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3612 construct_type_t **const p = anchor;
3615 construct_type_t *type;
3616 switch (token.type) {
3618 scope_t *scope = NULL;
3619 if (!env->must_be_abstract) {
3620 scope = &env->parameters;
3623 type = parse_function_declarator(scope);
3627 type = parse_array_declarator();
3630 goto declarator_finished;
3633 /* insert in the middle of the list (at p) */
3634 type->base.next = *p;
3637 anchor = &type->base.next;
3640 declarator_finished:
3641 /* append inner_types at the end of the list, we don't to set anchor anymore
3642 * as it's not needed anymore */
3643 *anchor = inner_types;
3650 static type_t *construct_declarator_type(construct_type_t *construct_list,
3653 construct_type_t *iter = construct_list;
3654 for (; iter != NULL; iter = iter->base.next) {
3655 source_position_t const* const pos = &iter->base.pos;
3656 switch (iter->kind) {
3657 case CONSTRUCT_INVALID:
3659 case CONSTRUCT_FUNCTION: {
3660 construct_function_type_t *function = &iter->function;
3661 type_t *function_type = function->function_type;
3663 function_type->function.return_type = type;
3665 type_t *skipped_return_type = skip_typeref(type);
3667 if (is_type_function(skipped_return_type)) {
3668 errorf(pos, "function returning function is not allowed");
3669 } else if (is_type_array(skipped_return_type)) {
3670 errorf(pos, "function returning array is not allowed");
3672 if (skipped_return_type->base.qualifiers != 0) {
3673 warningf(WARN_OTHER, pos, "type qualifiers in return type of function type are meaningless");
3677 /* The function type was constructed earlier. Freeing it here will
3678 * destroy other types. */
3679 type = typehash_insert(function_type);
3683 case CONSTRUCT_POINTER: {
3684 if (is_type_reference(skip_typeref(type)))
3685 errorf(pos, "cannot declare a pointer to reference");
3687 parsed_pointer_t *pointer = &iter->pointer;
3688 type = make_based_pointer_type(type, pointer->type_qualifiers, pointer->base_variable);
3692 case CONSTRUCT_REFERENCE:
3693 if (is_type_reference(skip_typeref(type)))
3694 errorf(pos, "cannot declare a reference to reference");
3696 type = make_reference_type(type);
3699 case CONSTRUCT_ARRAY: {
3700 if (is_type_reference(skip_typeref(type)))
3701 errorf(pos, "cannot declare an array of references");
3703 parsed_array_t *array = &iter->array;
3704 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
3706 expression_t *size_expression = array->size;
3707 if (size_expression != NULL) {
3709 = create_implicit_cast(size_expression, type_size_t);
3712 array_type->base.qualifiers = array->type_qualifiers;
3713 array_type->array.element_type = type;
3714 array_type->array.is_static = array->is_static;
3715 array_type->array.is_variable = array->is_variable;
3716 array_type->array.size_expression = size_expression;
3718 if (size_expression != NULL) {
3719 switch (is_constant_expression(size_expression)) {
3720 case EXPR_CLASS_CONSTANT: {
3721 long const size = fold_constant_to_int(size_expression);
3722 array_type->array.size = size;
3723 array_type->array.size_constant = true;
3724 /* §6.7.5.2:1 If the expression is a constant expression,
3725 * it shall have a value greater than zero. */
3727 errorf(&size_expression->base.source_position,
3728 "size of array must be greater than zero");
3729 } else if (size == 0 && !GNU_MODE) {
3730 errorf(&size_expression->base.source_position,
3731 "size of array must be greater than zero (zero length arrays are a GCC extension)");
3736 case EXPR_CLASS_VARIABLE:
3737 array_type->array.is_vla = true;
3740 case EXPR_CLASS_ERROR:
3745 type_t *skipped_type = skip_typeref(type);
3747 if (is_type_incomplete(skipped_type)) {
3748 errorf(pos, "array of incomplete type '%T' is not allowed", type);
3749 } else if (is_type_function(skipped_type)) {
3750 errorf(pos, "array of functions is not allowed");
3752 type = identify_new_type(array_type);
3756 internal_errorf(pos, "invalid type construction found");
3762 static type_t *automatic_type_conversion(type_t *orig_type);
3764 static type_t *semantic_parameter(const source_position_t *pos,
3766 const declaration_specifiers_t *specifiers,
3767 entity_t const *const param)
3769 /* §6.7.5.3:7 A declaration of a parameter as ``array of type''
3770 * shall be adjusted to ``qualified pointer to type'',
3772 * §6.7.5.3:8 A declaration of a parameter as ``function returning
3773 * type'' shall be adjusted to ``pointer to function
3774 * returning type'', as in 6.3.2.1. */
3775 type = automatic_type_conversion(type);
3777 if (specifiers->is_inline && is_type_valid(type)) {
3778 errorf(pos, "'%N' declared 'inline'", param);
3781 /* §6.9.1:6 The declarations in the declaration list shall contain
3782 * no storage-class specifier other than register and no
3783 * initializations. */
3784 if (specifiers->thread_local || (
3785 specifiers->storage_class != STORAGE_CLASS_NONE &&
3786 specifiers->storage_class != STORAGE_CLASS_REGISTER)
3788 errorf(pos, "invalid storage class for '%N'", param);
3791 /* delay test for incomplete type, because we might have (void)
3792 * which is legal but incomplete... */
3797 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
3798 declarator_flags_t flags)
3800 parse_declarator_env_t env;
3801 memset(&env, 0, sizeof(env));
3802 env.may_be_abstract = (flags & DECL_MAY_BE_ABSTRACT) != 0;
3804 construct_type_t *construct_type = parse_inner_declarator(&env);
3806 construct_declarator_type(construct_type, specifiers->type);
3807 type_t *type = skip_typeref(orig_type);
3809 if (construct_type != NULL) {
3810 obstack_free(&temp_obst, construct_type);
3813 attribute_t *attributes = parse_attributes(env.attributes);
3814 /* append (shared) specifier attribute behind attributes of this
3816 attribute_t **anchor = &attributes;
3817 while (*anchor != NULL)
3818 anchor = &(*anchor)->next;
3819 *anchor = specifiers->attributes;
3822 if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
3823 entity = allocate_entity_zero(ENTITY_TYPEDEF, NAMESPACE_NORMAL, env.symbol);
3824 entity->base.source_position = env.source_position;
3825 entity->typedefe.type = orig_type;
3827 if (anonymous_entity != NULL) {
3828 if (is_type_compound(type)) {
3829 assert(anonymous_entity->compound.alias == NULL);
3830 assert(anonymous_entity->kind == ENTITY_STRUCT ||
3831 anonymous_entity->kind == ENTITY_UNION);
3832 anonymous_entity->compound.alias = entity;
3833 anonymous_entity = NULL;
3834 } else if (is_type_enum(type)) {
3835 assert(anonymous_entity->enume.alias == NULL);
3836 assert(anonymous_entity->kind == ENTITY_ENUM);
3837 anonymous_entity->enume.alias = entity;
3838 anonymous_entity = NULL;
3842 /* create a declaration type entity */
3843 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
3844 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER, NAMESPACE_NORMAL, env.symbol);
3846 if (env.symbol != NULL) {
3847 if (specifiers->is_inline && is_type_valid(type)) {
3848 errorf(&env.source_position,
3849 "compound member '%Y' declared 'inline'", env.symbol);
3852 if (specifiers->thread_local ||
3853 specifiers->storage_class != STORAGE_CLASS_NONE) {
3854 errorf(&env.source_position,
3855 "compound member '%Y' must have no storage class",
3859 } else if (flags & DECL_IS_PARAMETER) {
3860 entity = allocate_entity_zero(ENTITY_PARAMETER, NAMESPACE_NORMAL, env.symbol);
3861 orig_type = semantic_parameter(&env.source_position, orig_type, specifiers, entity);
3862 } else if (is_type_function(type)) {
3863 entity = allocate_entity_zero(ENTITY_FUNCTION, NAMESPACE_NORMAL, env.symbol);
3864 entity->function.is_inline = specifiers->is_inline;
3865 entity->function.elf_visibility = default_visibility;
3866 entity->function.parameters = env.parameters;
3868 if (env.symbol != NULL) {
3869 /* this needs fixes for C++ */
3870 bool in_function_scope = current_function != NULL;
3872 if (specifiers->thread_local || (
3873 specifiers->storage_class != STORAGE_CLASS_EXTERN &&
3874 specifiers->storage_class != STORAGE_CLASS_NONE &&
3875 (in_function_scope || specifiers->storage_class != STORAGE_CLASS_STATIC)
3877 errorf(&env.source_position, "invalid storage class for '%N'", entity);
3881 entity = allocate_entity_zero(ENTITY_VARIABLE, NAMESPACE_NORMAL, env.symbol);
3882 entity->variable.elf_visibility = default_visibility;
3883 entity->variable.thread_local = specifiers->thread_local;
3885 if (env.symbol != NULL) {
3886 if (specifiers->is_inline && is_type_valid(type)) {
3887 errorf(&env.source_position, "'%N' declared 'inline'", entity);
3890 bool invalid_storage_class = false;
3891 if (current_scope == file_scope) {
3892 if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
3893 specifiers->storage_class != STORAGE_CLASS_NONE &&
3894 specifiers->storage_class != STORAGE_CLASS_STATIC) {
3895 invalid_storage_class = true;
3898 if (specifiers->thread_local &&
3899 specifiers->storage_class == STORAGE_CLASS_NONE) {
3900 invalid_storage_class = true;
3903 if (invalid_storage_class) {
3904 errorf(&env.source_position, "invalid storage class for variable '%N'", entity);
3909 entity->base.source_position = env.symbol != NULL ? env.source_position : specifiers->source_position;
3910 entity->declaration.type = orig_type;
3911 entity->declaration.alignment = get_type_alignment(orig_type);
3912 entity->declaration.modifiers = env.modifiers;
3913 entity->declaration.attributes = attributes;
3915 storage_class_t storage_class = specifiers->storage_class;
3916 entity->declaration.declared_storage_class = storage_class;
3918 if (storage_class == STORAGE_CLASS_NONE && current_function != NULL)
3919 storage_class = STORAGE_CLASS_AUTO;
3920 entity->declaration.storage_class = storage_class;
3923 if (attributes != NULL) {
3924 handle_entity_attributes(attributes, entity);
3930 static type_t *parse_abstract_declarator(type_t *base_type)
3932 parse_declarator_env_t env;
3933 memset(&env, 0, sizeof(env));
3934 env.may_be_abstract = true;
3935 env.must_be_abstract = true;
3937 construct_type_t *construct_type = parse_inner_declarator(&env);
3939 type_t *result = construct_declarator_type(construct_type, base_type);
3940 if (construct_type != NULL) {
3941 obstack_free(&temp_obst, construct_type);
3943 result = handle_type_attributes(env.attributes, result);
3949 * Check if the declaration of main is suspicious. main should be a
3950 * function with external linkage, returning int, taking either zero
3951 * arguments, two, or three arguments of appropriate types, ie.
3953 * int main([ int argc, char **argv [, char **env ] ]).
3955 * @param decl the declaration to check
3956 * @param type the function type of the declaration
3958 static void check_main(const entity_t *entity)
3960 const source_position_t *pos = &entity->base.source_position;
3961 if (entity->kind != ENTITY_FUNCTION) {
3962 warningf(WARN_MAIN, pos, "'main' is not a function");
3966 if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
3967 warningf(WARN_MAIN, pos, "'main' is normally a non-static function");
3970 type_t *type = skip_typeref(entity->declaration.type);
3971 assert(is_type_function(type));
3973 function_type_t const *const func_type = &type->function;
3974 type_t *const ret_type = func_type->return_type;
3975 if (!types_compatible(skip_typeref(ret_type), type_int)) {
3976 warningf(WARN_MAIN, pos, "return type of 'main' should be 'int', but is '%T'", ret_type);
3978 const function_parameter_t *parm = func_type->parameters;
3980 type_t *const first_type = skip_typeref(parm->type);
3981 type_t *const first_type_unqual = get_unqualified_type(first_type);
3982 if (!types_compatible(first_type_unqual, type_int)) {
3983 warningf(WARN_MAIN, pos, "first argument of 'main' should be 'int', but is '%T'", parm->type);
3987 type_t *const second_type = skip_typeref(parm->type);
3988 type_t *const second_type_unqual
3989 = get_unqualified_type(second_type);
3990 if (!types_compatible(second_type_unqual, type_char_ptr_ptr)) {
3991 warningf(WARN_MAIN, pos, "second argument of 'main' should be 'char**', but is '%T'", parm->type);
3995 type_t *const third_type = skip_typeref(parm->type);
3996 type_t *const third_type_unqual
3997 = get_unqualified_type(third_type);
3998 if (!types_compatible(third_type_unqual, type_char_ptr_ptr)) {
3999 warningf(WARN_MAIN, pos, "third argument of 'main' should be 'char**', but is '%T'", parm->type);
4003 goto warn_arg_count;
4007 warningf(WARN_MAIN, pos, "'main' takes only zero, two or three arguments");
4013 * Check if a symbol is the equal to "main".
4015 static bool is_sym_main(const symbol_t *const sym)
4017 return strcmp(sym->string, "main") == 0;
4020 static void error_redefined_as_different_kind(const source_position_t *pos,
4021 const entity_t *old, entity_kind_t new_kind)
4023 char const *const what = get_entity_kind_name(new_kind);
4024 source_position_t const *const ppos = &old->base.source_position;
4025 errorf(pos, "redeclaration of '%N' as %s (declared %P)", old, what, ppos);
4028 static bool is_entity_valid(entity_t *const ent)
4030 if (is_declaration(ent)) {
4031 return is_type_valid(skip_typeref(ent->declaration.type));
4032 } else if (ent->kind == ENTITY_TYPEDEF) {
4033 return is_type_valid(skip_typeref(ent->typedefe.type));
4038 static bool contains_attribute(const attribute_t *list, const attribute_t *attr)
4040 for (const attribute_t *tattr = list; tattr != NULL; tattr = tattr->next) {
4041 if (attributes_equal(tattr, attr))
4048 * test wether new_list contains any attributes not included in old_list
4050 static bool has_new_attributes(const attribute_t *old_list,
4051 const attribute_t *new_list)
4053 for (const attribute_t *attr = new_list; attr != NULL; attr = attr->next) {
4054 if (!contains_attribute(old_list, attr))
4061 * Merge in attributes from an attribute list (probably from a previous
4062 * declaration with the same name). Warning: destroys the old structure
4063 * of the attribute list - don't reuse attributes after this call.
4065 static void merge_in_attributes(declaration_t *decl, attribute_t *attributes)
4068 for (attribute_t *attr = attributes; attr != NULL; attr = next) {
4070 if (contains_attribute(decl->attributes, attr))
4073 /* move attribute to new declarations attributes list */
4074 attr->next = decl->attributes;
4075 decl->attributes = attr;
4080 * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4081 * for various problems that occur for multiple definitions
4083 entity_t *record_entity(entity_t *entity, const bool is_definition)
4085 const symbol_t *const symbol = entity->base.symbol;
4086 const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc;
4087 const source_position_t *pos = &entity->base.source_position;
4089 /* can happen in error cases */
4093 entity_t *const previous_entity = get_entity(symbol, namespc);
4094 /* pushing the same entity twice will break the stack structure */
4095 assert(previous_entity != entity);
4097 if (entity->kind == ENTITY_FUNCTION) {
4098 type_t *const orig_type = entity->declaration.type;
4099 type_t *const type = skip_typeref(orig_type);
4101 assert(is_type_function(type));
4102 if (type->function.unspecified_parameters &&
4103 previous_entity == NULL &&
4104 !entity->declaration.implicit) {
4105 warningf(WARN_STRICT_PROTOTYPES, pos, "function declaration '%#N' is not a prototype", entity);
4108 if (current_scope == file_scope && is_sym_main(symbol)) {
4113 if (is_declaration(entity) &&
4114 entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
4115 current_scope != file_scope &&
4116 !entity->declaration.implicit) {
4117 warningf(WARN_NESTED_EXTERNS, pos, "nested extern declaration of '%#N'", entity);
4120 if (previous_entity != NULL) {
4121 source_position_t const *const ppos = &previous_entity->base.source_position;
4123 if (previous_entity->base.parent_scope == ¤t_function->parameters &&
4124 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
4125 assert(previous_entity->kind == ENTITY_PARAMETER);
4126 errorf(pos, "declaration of '%N' redeclares the '%N' (declared %P)", entity, previous_entity, ppos);
4130 if (previous_entity->base.parent_scope == current_scope) {
4131 if (previous_entity->kind != entity->kind) {
4132 if (is_entity_valid(previous_entity) && is_entity_valid(entity)) {
4133 error_redefined_as_different_kind(pos, previous_entity,
4138 if (previous_entity->kind == ENTITY_ENUM_VALUE) {
4139 errorf(pos, "redeclaration of '%N' (declared %P)", entity, ppos);
4142 if (previous_entity->kind == ENTITY_TYPEDEF) {
4143 /* TODO: C++ allows this for exactly the same type */
4144 errorf(pos, "redefinition of '%N' (declared %P)", entity, ppos);
4148 /* at this point we should have only VARIABLES or FUNCTIONS */
4149 assert(is_declaration(previous_entity) && is_declaration(entity));
4151 declaration_t *const prev_decl = &previous_entity->declaration;
4152 declaration_t *const decl = &entity->declaration;
4154 /* can happen for K&R style declarations */
4155 if (prev_decl->type == NULL &&
4156 previous_entity->kind == ENTITY_PARAMETER &&
4157 entity->kind == ENTITY_PARAMETER) {
4158 prev_decl->type = decl->type;
4159 prev_decl->storage_class = decl->storage_class;
4160 prev_decl->declared_storage_class = decl->declared_storage_class;
4161 prev_decl->modifiers = decl->modifiers;
4162 return previous_entity;
4165 type_t *const type = skip_typeref(decl->type);
4166 type_t *const prev_type = skip_typeref(prev_decl->type);
4168 if (!types_compatible(type, prev_type)) {
4169 errorf(pos, "declaration '%#N' is incompatible with '%#N' (declared %P)", entity, previous_entity, ppos);
4171 unsigned old_storage_class = prev_decl->storage_class;
4173 if (is_definition &&
4175 !(prev_decl->modifiers & DM_USED) &&
4176 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
4177 warningf(WARN_REDUNDANT_DECLS, ppos, "unnecessary static forward declaration for '%#N'", previous_entity);
4180 storage_class_t new_storage_class = decl->storage_class;
4182 /* pretend no storage class means extern for function
4183 * declarations (except if the previous declaration is neither
4184 * none nor extern) */
4185 if (entity->kind == ENTITY_FUNCTION) {
4186 /* the previous declaration could have unspecified parameters or
4187 * be a typedef, so use the new type */
4188 if (prev_type->function.unspecified_parameters || is_definition)
4189 prev_decl->type = type;
4191 switch (old_storage_class) {
4192 case STORAGE_CLASS_NONE:
4193 old_storage_class = STORAGE_CLASS_EXTERN;
4196 case STORAGE_CLASS_EXTERN:
4197 if (is_definition) {
4198 if (prev_type->function.unspecified_parameters && !is_sym_main(symbol)) {
4199 warningf(WARN_MISSING_PROTOTYPES, pos, "no previous prototype for '%#N'", entity);
4201 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4202 new_storage_class = STORAGE_CLASS_EXTERN;
4209 } else if (is_type_incomplete(prev_type)) {
4210 prev_decl->type = type;
4213 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4214 new_storage_class == STORAGE_CLASS_EXTERN) {
4216 warn_redundant_declaration: ;
4218 = has_new_attributes(prev_decl->attributes,
4220 if (has_new_attrs) {
4221 merge_in_attributes(decl, prev_decl->attributes);
4222 } else if (!is_definition &&
4223 is_type_valid(prev_type) &&
4224 strcmp(ppos->input_name, "<builtin>") != 0) {
4225 warningf(WARN_REDUNDANT_DECLS, pos, "redundant declaration for '%Y' (declared %P)", symbol, ppos);
4227 } else if (current_function == NULL) {
4228 if (old_storage_class != STORAGE_CLASS_STATIC &&
4229 new_storage_class == STORAGE_CLASS_STATIC) {
4230 errorf(pos, "static declaration of '%Y' follows non-static declaration (declared %P)", symbol, ppos);
4231 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4232 prev_decl->storage_class = STORAGE_CLASS_NONE;
4233 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
4235 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
4237 goto error_redeclaration;
4238 goto warn_redundant_declaration;
4240 } else if (is_type_valid(prev_type)) {
4241 if (old_storage_class == new_storage_class) {
4242 error_redeclaration:
4243 errorf(pos, "redeclaration of '%Y' (declared %P)", symbol, ppos);
4245 errorf(pos, "redeclaration of '%Y' with different linkage (declared %P)", symbol, ppos);
4250 prev_decl->modifiers |= decl->modifiers;
4251 if (entity->kind == ENTITY_FUNCTION) {
4252 previous_entity->function.is_inline |= entity->function.is_inline;
4254 return previous_entity;
4258 if (is_warn_on(why = WARN_SHADOW) ||
4259 (is_warn_on(why = WARN_SHADOW_LOCAL) && previous_entity->base.parent_scope != file_scope)) {
4260 char const *const what = get_entity_kind_name(previous_entity->kind);
4261 warningf(why, pos, "'%N' shadows %s (declared %P)", entity, what, ppos);
4265 if (entity->kind == ENTITY_FUNCTION) {
4266 if (is_definition &&
4267 entity->declaration.storage_class != STORAGE_CLASS_STATIC &&
4268 !is_sym_main(symbol)) {
4269 if (is_warn_on(WARN_MISSING_PROTOTYPES)) {
4270 warningf(WARN_MISSING_PROTOTYPES, pos, "no previous prototype for '%#N'", entity);
4272 goto warn_missing_declaration;
4275 } else if (entity->kind == ENTITY_VARIABLE) {
4276 if (current_scope == file_scope &&
4277 entity->declaration.storage_class == STORAGE_CLASS_NONE &&
4278 !entity->declaration.implicit) {
4279 warn_missing_declaration:
4280 warningf(WARN_MISSING_DECLARATIONS, pos, "no previous declaration for '%#N'", entity);
4285 assert(entity->base.parent_scope == NULL);
4286 assert(current_scope != NULL);
4288 entity->base.parent_scope = current_scope;
4289 environment_push(entity);
4290 append_entity(current_scope, entity);
4295 static void parser_error_multiple_definition(entity_t *entity,
4296 const source_position_t *source_position)
4298 errorf(source_position, "multiple definition of '%Y' (declared %P)",
4299 entity->base.symbol, &entity->base.source_position);
4302 static bool is_declaration_specifier(const token_t *token)
4304 switch (token->type) {
4308 return is_typedef_symbol(token->symbol);
4315 static void parse_init_declarator_rest(entity_t *entity)
4317 type_t *orig_type = type_error_type;
4319 if (entity->base.kind == ENTITY_TYPEDEF) {
4320 source_position_t const *const pos = &entity->base.source_position;
4321 errorf(pos, "'%N' is initialized (use __typeof__ instead)", entity);
4323 assert(is_declaration(entity));
4324 orig_type = entity->declaration.type;
4327 type_t *type = skip_typeref(orig_type);
4329 if (entity->kind == ENTITY_VARIABLE
4330 && entity->variable.initializer != NULL) {
4331 parser_error_multiple_definition(entity, HERE);
4335 declaration_t *const declaration = &entity->declaration;
4336 bool must_be_constant = false;
4337 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
4338 entity->base.parent_scope == file_scope) {
4339 must_be_constant = true;
4342 if (is_type_function(type)) {
4343 source_position_t const *const pos = &entity->base.source_position;
4344 errorf(pos, "'%N' is initialized like a variable", entity);
4345 orig_type = type_error_type;
4348 parse_initializer_env_t env;
4349 env.type = orig_type;
4350 env.must_be_constant = must_be_constant;
4351 env.entity = entity;
4352 current_init_decl = entity;
4354 initializer_t *initializer = parse_initializer(&env);
4355 current_init_decl = NULL;
4357 if (entity->kind == ENTITY_VARIABLE) {
4358 /* §6.7.5:22 array initializers for arrays with unknown size
4359 * determine the array type size */
4360 declaration->type = env.type;
4361 entity->variable.initializer = initializer;
4365 /* parse rest of a declaration without any declarator */
4366 static void parse_anonymous_declaration_rest(
4367 const declaration_specifiers_t *specifiers)
4370 anonymous_entity = NULL;
4372 source_position_t const *const pos = &specifiers->source_position;
4373 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
4374 specifiers->thread_local) {
4375 warningf(WARN_OTHER, pos, "useless storage class in empty declaration");
4378 type_t *type = specifiers->type;
4379 switch (type->kind) {
4380 case TYPE_COMPOUND_STRUCT:
4381 case TYPE_COMPOUND_UNION: {
4382 if (type->compound.compound->base.symbol == NULL) {
4383 warningf(WARN_OTHER, pos, "unnamed struct/union that defines no instances");
4392 warningf(WARN_OTHER, pos, "empty declaration");
4397 static void check_variable_type_complete(entity_t *ent)
4399 if (ent->kind != ENTITY_VARIABLE)
4402 /* §6.7:7 If an identifier for an object is declared with no linkage, the
4403 * type for the object shall be complete [...] */
4404 declaration_t *decl = &ent->declaration;
4405 if (decl->storage_class == STORAGE_CLASS_EXTERN ||
4406 decl->storage_class == STORAGE_CLASS_STATIC)
4409 type_t *const type = skip_typeref(decl->type);
4410 if (!is_type_incomplete(type))
4413 /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
4414 * are given length one. */
4415 if (is_type_array(type) && ent->base.parent_scope == file_scope) {
4416 ARR_APP1(declaration_t*, incomplete_arrays, decl);
4420 errorf(&ent->base.source_position, "variable '%#N' has incomplete type", ent);
4424 static void parse_declaration_rest(entity_t *ndeclaration,
4425 const declaration_specifiers_t *specifiers,
4426 parsed_declaration_func finished_declaration,
4427 declarator_flags_t flags)
4429 add_anchor_token(';');
4430 add_anchor_token(',');
4432 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
4434 if (token.type == '=') {
4435 parse_init_declarator_rest(entity);
4436 } else if (entity->kind == ENTITY_VARIABLE) {
4437 /* ISO/IEC 14882:1998(E) §8.5.3:3 The initializer can be omitted
4438 * [...] where the extern specifier is explicitly used. */
4439 declaration_t *decl = &entity->declaration;
4440 if (decl->storage_class != STORAGE_CLASS_EXTERN) {
4441 type_t *type = decl->type;
4442 if (is_type_reference(skip_typeref(type))) {
4443 source_position_t const *const pos = &entity->base.source_position;
4444 errorf(pos, "reference '%#N' must be initialized", entity);
4449 check_variable_type_complete(entity);
4454 add_anchor_token('=');
4455 ndeclaration = parse_declarator(specifiers, flags);
4456 rem_anchor_token('=');
4458 expect(';', end_error);
4461 anonymous_entity = NULL;
4462 rem_anchor_token(';');
4463 rem_anchor_token(',');
4466 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
4468 symbol_t *symbol = entity->base.symbol;
4472 assert(entity->base.namespc == NAMESPACE_NORMAL);
4473 entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
4474 if (previous_entity == NULL
4475 || previous_entity->base.parent_scope != current_scope) {
4476 errorf(&entity->base.source_position, "expected declaration of a function parameter, found '%Y'",
4481 if (is_definition) {
4482 errorf(HERE, "'%N' is initialised", entity);
4485 return record_entity(entity, false);
4488 static void parse_declaration(parsed_declaration_func finished_declaration,
4489 declarator_flags_t flags)
4491 add_anchor_token(';');
4492 declaration_specifiers_t specifiers;
4493 parse_declaration_specifiers(&specifiers);
4494 rem_anchor_token(';');
4496 if (token.type == ';') {
4497 parse_anonymous_declaration_rest(&specifiers);
4499 entity_t *entity = parse_declarator(&specifiers, flags);
4500 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
4505 static type_t *get_default_promoted_type(type_t *orig_type)
4507 type_t *result = orig_type;
4509 type_t *type = skip_typeref(orig_type);
4510 if (is_type_integer(type)) {
4511 result = promote_integer(type);
4512 } else if (is_type_atomic(type, ATOMIC_TYPE_FLOAT)) {
4513 result = type_double;
4519 static void parse_kr_declaration_list(entity_t *entity)
4521 if (entity->kind != ENTITY_FUNCTION)
4524 type_t *type = skip_typeref(entity->declaration.type);
4525 assert(is_type_function(type));
4526 if (!type->function.kr_style_parameters)
4529 add_anchor_token('{');
4531 /* push function parameters */
4532 size_t const top = environment_top();
4533 scope_t *old_scope = scope_push(&entity->function.parameters);
4535 entity_t *parameter = entity->function.parameters.entities;
4536 for ( ; parameter != NULL; parameter = parameter->base.next) {
4537 assert(parameter->base.parent_scope == NULL);
4538 parameter->base.parent_scope = current_scope;
4539 environment_push(parameter);
4542 /* parse declaration list */
4544 switch (token.type) {
4546 case T___extension__:
4547 /* This covers symbols, which are no type, too, and results in
4548 * better error messages. The typical cases are misspelled type
4549 * names and missing includes. */
4551 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
4559 /* pop function parameters */
4560 assert(current_scope == &entity->function.parameters);
4561 scope_pop(old_scope);
4562 environment_pop_to(top);
4564 /* update function type */
4565 type_t *new_type = duplicate_type(type);
4567 function_parameter_t *parameters = NULL;
4568 function_parameter_t **anchor = ¶meters;
4570 /* did we have an earlier prototype? */
4571 entity_t *proto_type = get_entity(entity->base.symbol, NAMESPACE_NORMAL);
4572 if (proto_type != NULL && proto_type->kind != ENTITY_FUNCTION)
4575 function_parameter_t *proto_parameter = NULL;
4576 if (proto_type != NULL) {
4577 type_t *proto_type_type = proto_type->declaration.type;
4578 proto_parameter = proto_type_type->function.parameters;
4579 /* If a K&R function definition has a variadic prototype earlier, then
4580 * make the function definition variadic, too. This should conform to
4581 * §6.7.5.3:15 and §6.9.1:8. */
4582 new_type->function.variadic = proto_type_type->function.variadic;
4584 /* §6.9.1.7: A K&R style parameter list does NOT act as a function
4586 new_type->function.unspecified_parameters = true;
4589 bool need_incompatible_warning = false;
4590 parameter = entity->function.parameters.entities;
4591 for (; parameter != NULL; parameter = parameter->base.next,
4593 proto_parameter == NULL ? NULL : proto_parameter->next) {
4594 if (parameter->kind != ENTITY_PARAMETER)
4597 type_t *parameter_type = parameter->declaration.type;
4598 if (parameter_type == NULL) {
4599 source_position_t const* const pos = ¶meter->base.source_position;
4601 errorf(pos, "no type specified for function '%N'", parameter);
4602 parameter_type = type_error_type;
4604 warningf(WARN_IMPLICIT_INT, pos, "no type specified for function parameter '%N', using 'int'", parameter);
4605 parameter_type = type_int;
4607 parameter->declaration.type = parameter_type;
4610 semantic_parameter_incomplete(parameter);
4612 /* we need the default promoted types for the function type */
4613 type_t *not_promoted = parameter_type;
4614 parameter_type = get_default_promoted_type(parameter_type);
4616 /* gcc special: if the type of the prototype matches the unpromoted
4617 * type don't promote */
4618 if (!strict_mode && proto_parameter != NULL) {
4619 type_t *proto_p_type = skip_typeref(proto_parameter->type);
4620 type_t *promo_skip = skip_typeref(parameter_type);
4621 type_t *param_skip = skip_typeref(not_promoted);
4622 if (!types_compatible(proto_p_type, promo_skip)
4623 && types_compatible(proto_p_type, param_skip)) {
4625 need_incompatible_warning = true;
4626 parameter_type = not_promoted;
4629 function_parameter_t *const function_parameter
4630 = allocate_parameter(parameter_type);
4632 *anchor = function_parameter;
4633 anchor = &function_parameter->next;
4636 new_type->function.parameters = parameters;
4637 new_type = identify_new_type(new_type);
4639 if (need_incompatible_warning) {
4640 symbol_t const *const sym = entity->base.symbol;
4641 source_position_t const *const pos = &entity->base.source_position;
4642 source_position_t const *const ppos = &proto_type->base.source_position;
4643 warningf(WARN_OTHER, pos, "declaration '%#N' is incompatible with '%#T' (declared %P)", proto_type, new_type, sym, ppos);
4645 entity->declaration.type = new_type;
4647 rem_anchor_token('{');
4650 static bool first_err = true;
4653 * When called with first_err set, prints the name of the current function,
4656 static void print_in_function(void)
4660 char const *const file = current_function->base.base.source_position.input_name;
4661 diagnosticf("%s: In '%N':\n", file, (entity_t const*)current_function);
4666 * Check if all labels are defined in the current function.
4667 * Check if all labels are used in the current function.
4669 static void check_labels(void)
4671 for (const goto_statement_t *goto_statement = goto_first;
4672 goto_statement != NULL;
4673 goto_statement = goto_statement->next) {
4674 /* skip computed gotos */
4675 if (goto_statement->expression != NULL)
4678 label_t *label = goto_statement->label;
4679 if (label->base.source_position.input_name == NULL) {
4680 print_in_function();
4681 source_position_t const *const pos = &goto_statement->base.source_position;
4682 errorf(pos, "'%N' used but not defined", (entity_t const*)label);
4686 if (is_warn_on(WARN_UNUSED_LABEL)) {
4687 for (const label_statement_t *label_statement = label_first;
4688 label_statement != NULL;
4689 label_statement = label_statement->next) {
4690 label_t *label = label_statement->label;
4692 if (! label->used) {
4693 print_in_function();
4694 source_position_t const *const pos = &label_statement->base.source_position;
4695 warningf(WARN_UNUSED_LABEL, pos, "'%N' defined but not used", (entity_t const*)label);
4701 static void warn_unused_entity(warning_t const why, entity_t *entity, entity_t *const last)
4703 entity_t const *const end = last != NULL ? last->base.next : NULL;
4704 for (; entity != end; entity = entity->base.next) {
4705 if (!is_declaration(entity))
4708 declaration_t *declaration = &entity->declaration;
4709 if (declaration->implicit)
4712 if (!declaration->used) {
4713 print_in_function();
4714 warningf(why, &entity->base.source_position, "'%N' is unused", entity);
4715 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
4716 print_in_function();
4717 warningf(why, &entity->base.source_position, "'%N' is never read", entity);
4722 static void check_unused_variables(statement_t *const stmt, void *const env)
4726 switch (stmt->kind) {
4727 case STATEMENT_DECLARATION: {
4728 declaration_statement_t const *const decls = &stmt->declaration;
4729 warn_unused_entity(WARN_UNUSED_VARIABLE, decls->declarations_begin, decls->declarations_end);
4734 warn_unused_entity(WARN_UNUSED_VARIABLE, stmt->fors.scope.entities, NULL);
4743 * Check declarations of current_function for unused entities.
4745 static void check_declarations(void)
4747 if (is_warn_on(WARN_UNUSED_PARAMETER)) {
4748 const scope_t *scope = ¤t_function->parameters;
4750 /* do not issue unused warnings for main */
4751 if (!is_sym_main(current_function->base.base.symbol)) {
4752 warn_unused_entity(WARN_UNUSED_PARAMETER, scope->entities, NULL);
4755 if (is_warn_on(WARN_UNUSED_VARIABLE)) {
4756 walk_statements(current_function->statement, check_unused_variables,
4761 static int determine_truth(expression_t const* const cond)
4764 is_constant_expression(cond) != EXPR_CLASS_CONSTANT ? 0 :
4765 fold_constant_to_bool(cond) ? 1 :
4769 static void check_reachable(statement_t *);
4770 static bool reaches_end;
4772 static bool expression_returns(expression_t const *const expr)
4774 switch (expr->kind) {
4776 expression_t const *const func = expr->call.function;
4777 if (func->kind == EXPR_REFERENCE) {
4778 entity_t *entity = func->reference.entity;
4779 if (entity->kind == ENTITY_FUNCTION
4780 && entity->declaration.modifiers & DM_NORETURN)
4784 if (!expression_returns(func))
4787 for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
4788 if (!expression_returns(arg->expression))
4795 case EXPR_REFERENCE:
4796 case EXPR_REFERENCE_ENUM_VALUE:
4798 case EXPR_STRING_LITERAL:
4799 case EXPR_WIDE_STRING_LITERAL:
4800 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
4801 case EXPR_LABEL_ADDRESS:
4802 case EXPR_CLASSIFY_TYPE:
4803 case EXPR_SIZEOF: // TODO handle obscure VLA case
4806 case EXPR_BUILTIN_CONSTANT_P:
4807 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
4812 case EXPR_STATEMENT: {
4813 bool old_reaches_end = reaches_end;
4814 reaches_end = false;
4815 check_reachable(expr->statement.statement);
4816 bool returns = reaches_end;
4817 reaches_end = old_reaches_end;
4821 case EXPR_CONDITIONAL:
4822 // TODO handle constant expression
4824 if (!expression_returns(expr->conditional.condition))
4827 if (expr->conditional.true_expression != NULL
4828 && expression_returns(expr->conditional.true_expression))
4831 return expression_returns(expr->conditional.false_expression);
4834 return expression_returns(expr->select.compound);
4836 case EXPR_ARRAY_ACCESS:
4838 expression_returns(expr->array_access.array_ref) &&
4839 expression_returns(expr->array_access.index);
4842 return expression_returns(expr->va_starte.ap);
4845 return expression_returns(expr->va_arge.ap);
4848 return expression_returns(expr->va_copye.src);
4850 EXPR_UNARY_CASES_MANDATORY
4851 return expression_returns(expr->unary.value);
4853 case EXPR_UNARY_THROW:
4857 // TODO handle constant lhs of && and ||
4859 expression_returns(expr->binary.left) &&
4860 expression_returns(expr->binary.right);
4866 panic("unhandled expression");
4869 static bool initializer_returns(initializer_t const *const init)
4871 switch (init->kind) {
4872 case INITIALIZER_VALUE:
4873 return expression_returns(init->value.value);
4875 case INITIALIZER_LIST: {
4876 initializer_t * const* i = init->list.initializers;
4877 initializer_t * const* const end = i + init->list.len;
4878 bool returns = true;
4879 for (; i != end; ++i) {
4880 if (!initializer_returns(*i))
4886 case INITIALIZER_STRING:
4887 case INITIALIZER_WIDE_STRING:
4888 case INITIALIZER_DESIGNATOR: // designators have no payload
4891 panic("unhandled initializer");
4894 static bool noreturn_candidate;
4896 static void check_reachable(statement_t *const stmt)
4898 if (stmt->base.reachable)
4900 if (stmt->kind != STATEMENT_DO_WHILE)
4901 stmt->base.reachable = true;
4903 statement_t *last = stmt;
4905 switch (stmt->kind) {
4906 case STATEMENT_INVALID:
4907 case STATEMENT_EMPTY:
4909 next = stmt->base.next;
4912 case STATEMENT_DECLARATION: {
4913 declaration_statement_t const *const decl = &stmt->declaration;
4914 entity_t const * ent = decl->declarations_begin;
4915 entity_t const *const last_decl = decl->declarations_end;
4917 for (;; ent = ent->base.next) {
4918 if (ent->kind == ENTITY_VARIABLE &&
4919 ent->variable.initializer != NULL &&
4920 !initializer_returns(ent->variable.initializer)) {
4923 if (ent == last_decl)
4927 next = stmt->base.next;
4931 case STATEMENT_COMPOUND:
4932 next = stmt->compound.statements;
4934 next = stmt->base.next;
4937 case STATEMENT_RETURN: {
4938 expression_t const *const val = stmt->returns.value;
4939 if (val == NULL || expression_returns(val))
4940 noreturn_candidate = false;
4944 case STATEMENT_IF: {
4945 if_statement_t const *const ifs = &stmt->ifs;
4946 expression_t const *const cond = ifs->condition;
4948 if (!expression_returns(cond))
4951 int const val = determine_truth(cond);
4954 check_reachable(ifs->true_statement);
4959 if (ifs->false_statement != NULL) {
4960 check_reachable(ifs->false_statement);
4964 next = stmt->base.next;
4968 case STATEMENT_SWITCH: {
4969 switch_statement_t const *const switchs = &stmt->switchs;
4970 expression_t const *const expr = switchs->expression;
4972 if (!expression_returns(expr))
4975 if (is_constant_expression(expr) == EXPR_CLASS_CONSTANT) {
4976 long const val = fold_constant_to_int(expr);
4977 case_label_statement_t * defaults = NULL;
4978 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4979 if (i->expression == NULL) {
4984 if (i->first_case <= val && val <= i->last_case) {
4985 check_reachable((statement_t*)i);
4990 if (defaults != NULL) {
4991 check_reachable((statement_t*)defaults);
4995 bool has_default = false;
4996 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4997 if (i->expression == NULL)
5000 check_reachable((statement_t*)i);
5007 next = stmt->base.next;
5011 case STATEMENT_EXPRESSION: {
5012 /* Check for noreturn function call */
5013 expression_t const *const expr = stmt->expression.expression;
5014 if (!expression_returns(expr))
5017 next = stmt->base.next;
5021 case STATEMENT_CONTINUE:
5022 for (statement_t *parent = stmt;;) {
5023 parent = parent->base.parent;
5024 if (parent == NULL) /* continue not within loop */
5028 switch (parent->kind) {
5029 case STATEMENT_WHILE: goto continue_while;
5030 case STATEMENT_DO_WHILE: goto continue_do_while;
5031 case STATEMENT_FOR: goto continue_for;
5037 case STATEMENT_BREAK:
5038 for (statement_t *parent = stmt;;) {
5039 parent = parent->base.parent;
5040 if (parent == NULL) /* break not within loop/switch */
5043 switch (parent->kind) {
5044 case STATEMENT_SWITCH:
5045 case STATEMENT_WHILE:
5046 case STATEMENT_DO_WHILE:
5049 next = parent->base.next;
5050 goto found_break_parent;
5058 case STATEMENT_GOTO:
5059 if (stmt->gotos.expression) {
5060 if (!expression_returns(stmt->gotos.expression))
5063 statement_t *parent = stmt->base.parent;
5064 if (parent == NULL) /* top level goto */
5068 next = stmt->gotos.label->statement;
5069 if (next == NULL) /* missing label */
5074 case STATEMENT_LABEL:
5075 next = stmt->label.statement;
5078 case STATEMENT_CASE_LABEL:
5079 next = stmt->case_label.statement;
5082 case STATEMENT_WHILE: {
5083 while_statement_t const *const whiles = &stmt->whiles;
5084 expression_t const *const cond = whiles->condition;
5086 if (!expression_returns(cond))
5089 int const val = determine_truth(cond);
5092 check_reachable(whiles->body);
5097 next = stmt->base.next;
5101 case STATEMENT_DO_WHILE:
5102 next = stmt->do_while.body;
5105 case STATEMENT_FOR: {
5106 for_statement_t *const fors = &stmt->fors;
5108 if (fors->condition_reachable)
5110 fors->condition_reachable = true;
5112 expression_t const *const cond = fors->condition;
5117 } else if (expression_returns(cond)) {
5118 val = determine_truth(cond);
5124 check_reachable(fors->body);
5129 next = stmt->base.next;
5133 case STATEMENT_MS_TRY: {
5134 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5135 check_reachable(ms_try->try_statement);
5136 next = ms_try->final_statement;
5140 case STATEMENT_LEAVE: {
5141 statement_t *parent = stmt;
5143 parent = parent->base.parent;
5144 if (parent == NULL) /* __leave not within __try */
5147 if (parent->kind == STATEMENT_MS_TRY) {
5149 next = parent->ms_try.final_statement;
5157 panic("invalid statement kind");
5160 while (next == NULL) {
5161 next = last->base.parent;
5163 noreturn_candidate = false;
5165 type_t *const type = skip_typeref(current_function->base.type);
5166 assert(is_type_function(type));
5167 type_t *const ret = skip_typeref(type->function.return_type);
5168 if (!is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5169 is_type_valid(ret) &&
5170 !is_sym_main(current_function->base.base.symbol)) {
5171 source_position_t const *const pos = &stmt->base.source_position;
5172 warningf(WARN_RETURN_TYPE, pos, "control reaches end of non-void function");
5177 switch (next->kind) {
5178 case STATEMENT_INVALID:
5179 case STATEMENT_EMPTY:
5180 case STATEMENT_DECLARATION:
5181 case STATEMENT_EXPRESSION:
5183 case STATEMENT_RETURN:
5184 case STATEMENT_CONTINUE:
5185 case STATEMENT_BREAK:
5186 case STATEMENT_GOTO:
5187 case STATEMENT_LEAVE:
5188 panic("invalid control flow in function");
5190 case STATEMENT_COMPOUND:
5191 if (next->compound.stmt_expr) {
5197 case STATEMENT_SWITCH:
5198 case STATEMENT_LABEL:
5199 case STATEMENT_CASE_LABEL:
5201 next = next->base.next;
5204 case STATEMENT_WHILE: {
5206 if (next->base.reachable)
5208 next->base.reachable = true;
5210 while_statement_t const *const whiles = &next->whiles;
5211 expression_t const *const cond = whiles->condition;
5213 if (!expression_returns(cond))
5216 int const val = determine_truth(cond);
5219 check_reachable(whiles->body);
5225 next = next->base.next;
5229 case STATEMENT_DO_WHILE: {
5231 if (next->base.reachable)
5233 next->base.reachable = true;
5235 do_while_statement_t const *const dw = &next->do_while;
5236 expression_t const *const cond = dw->condition;
5238 if (!expression_returns(cond))
5241 int const val = determine_truth(cond);
5244 check_reachable(dw->body);
5250 next = next->base.next;
5254 case STATEMENT_FOR: {
5256 for_statement_t *const fors = &next->fors;
5258 fors->step_reachable = true;
5260 if (fors->condition_reachable)
5262 fors->condition_reachable = true;
5264 expression_t const *const cond = fors->condition;
5269 } else if (expression_returns(cond)) {
5270 val = determine_truth(cond);
5276 check_reachable(fors->body);
5282 next = next->base.next;
5286 case STATEMENT_MS_TRY:
5288 next = next->ms_try.final_statement;
5293 check_reachable(next);
5296 static void check_unreachable(statement_t* const stmt, void *const env)
5300 switch (stmt->kind) {
5301 case STATEMENT_DO_WHILE:
5302 if (!stmt->base.reachable) {
5303 expression_t const *const cond = stmt->do_while.condition;
5304 if (determine_truth(cond) >= 0) {
5305 source_position_t const *const pos = &cond->base.source_position;
5306 warningf(WARN_UNREACHABLE_CODE, pos, "condition of do-while-loop is unreachable");
5311 case STATEMENT_FOR: {
5312 for_statement_t const* const fors = &stmt->fors;
5314 // if init and step are unreachable, cond is unreachable, too
5315 if (!stmt->base.reachable && !fors->step_reachable) {
5316 goto warn_unreachable;
5318 if (!stmt->base.reachable && fors->initialisation != NULL) {
5319 source_position_t const *const pos = &fors->initialisation->base.source_position;
5320 warningf(WARN_UNREACHABLE_CODE, pos, "initialisation of for-statement is unreachable");
5323 if (!fors->condition_reachable && fors->condition != NULL) {
5324 source_position_t const *const pos = &fors->condition->base.source_position;
5325 warningf(WARN_UNREACHABLE_CODE, pos, "condition of for-statement is unreachable");
5328 if (!fors->step_reachable && fors->step != NULL) {
5329 source_position_t const *const pos = &fors->step->base.source_position;
5330 warningf(WARN_UNREACHABLE_CODE, pos, "step of for-statement is unreachable");
5336 case STATEMENT_COMPOUND:
5337 if (stmt->compound.statements != NULL)
5339 goto warn_unreachable;
5341 case STATEMENT_DECLARATION: {
5342 /* Only warn if there is at least one declarator with an initializer.
5343 * This typically occurs in switch statements. */
5344 declaration_statement_t const *const decl = &stmt->declaration;
5345 entity_t const * ent = decl->declarations_begin;
5346 entity_t const *const last = decl->declarations_end;
5348 for (;; ent = ent->base.next) {
5349 if (ent->kind == ENTITY_VARIABLE &&
5350 ent->variable.initializer != NULL) {
5351 goto warn_unreachable;
5361 if (!stmt->base.reachable) {
5362 source_position_t const *const pos = &stmt->base.source_position;
5363 warningf(WARN_UNREACHABLE_CODE, pos, "statement is unreachable");
5369 static void parse_external_declaration(void)
5371 /* function-definitions and declarations both start with declaration
5373 add_anchor_token(';');
5374 declaration_specifiers_t specifiers;
5375 parse_declaration_specifiers(&specifiers);
5376 rem_anchor_token(';');
5378 /* must be a declaration */
5379 if (token.type == ';') {
5380 parse_anonymous_declaration_rest(&specifiers);
5384 add_anchor_token(',');
5385 add_anchor_token('=');
5386 add_anchor_token(';');
5387 add_anchor_token('{');
5389 /* declarator is common to both function-definitions and declarations */
5390 entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
5392 rem_anchor_token('{');
5393 rem_anchor_token(';');
5394 rem_anchor_token('=');
5395 rem_anchor_token(',');
5397 /* must be a declaration */
5398 switch (token.type) {
5402 parse_declaration_rest(ndeclaration, &specifiers, record_entity,
5407 /* must be a function definition */
5408 parse_kr_declaration_list(ndeclaration);
5410 if (token.type != '{') {
5411 parse_error_expected("while parsing function definition", '{', NULL);
5412 eat_until_matching_token(';');
5416 assert(is_declaration(ndeclaration));
5417 type_t *const orig_type = ndeclaration->declaration.type;
5418 type_t * type = skip_typeref(orig_type);
5420 if (!is_type_function(type)) {
5421 if (is_type_valid(type)) {
5422 errorf(HERE, "declarator '%#N' has a body but is not a function type", ndeclaration);
5428 source_position_t const *const pos = &ndeclaration->base.source_position;
5429 if (is_typeref(orig_type)) {
5431 errorf(pos, "type of function definition '%#N' is a typedef", ndeclaration);
5434 if (is_type_compound(skip_typeref(type->function.return_type))) {
5435 warningf(WARN_AGGREGATE_RETURN, pos, "'%N' returns an aggregate", ndeclaration);
5437 if (type->function.unspecified_parameters) {
5438 warningf(WARN_OLD_STYLE_DEFINITION, pos, "old-style definition of '%N'", ndeclaration);
5440 warningf(WARN_TRADITIONAL, pos, "traditional C rejects ISO C style definition of '%N'", ndeclaration);
5443 /* §6.7.5.3:14 a function definition with () means no
5444 * parameters (and not unspecified parameters) */
5445 if (type->function.unspecified_parameters &&
5446 type->function.parameters == NULL) {
5447 type_t *copy = duplicate_type(type);
5448 copy->function.unspecified_parameters = false;
5449 type = identify_new_type(copy);
5451 ndeclaration->declaration.type = type;
5454 entity_t *const entity = record_entity(ndeclaration, true);
5455 assert(entity->kind == ENTITY_FUNCTION);
5456 assert(ndeclaration->kind == ENTITY_FUNCTION);
5458 function_t *const function = &entity->function;
5459 if (ndeclaration != entity) {
5460 function->parameters = ndeclaration->function.parameters;
5462 assert(is_declaration(entity));
5463 type = skip_typeref(entity->declaration.type);
5465 /* push function parameters and switch scope */
5466 size_t const top = environment_top();
5467 scope_t *old_scope = scope_push(&function->parameters);
5469 entity_t *parameter = function->parameters.entities;
5470 for (; parameter != NULL; parameter = parameter->base.next) {
5471 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
5472 parameter->base.parent_scope = current_scope;
5474 assert(parameter->base.parent_scope == NULL
5475 || parameter->base.parent_scope == current_scope);
5476 parameter->base.parent_scope = current_scope;
5477 if (parameter->base.symbol == NULL) {
5478 errorf(¶meter->base.source_position, "parameter name omitted");
5481 environment_push(parameter);
5484 if (function->statement != NULL) {
5485 parser_error_multiple_definition(entity, HERE);
5488 /* parse function body */
5489 int label_stack_top = label_top();
5490 function_t *old_current_function = current_function;
5491 entity_t *old_current_entity = current_entity;
5492 current_function = function;
5493 current_entity = entity;
5494 current_parent = NULL;
5497 goto_anchor = &goto_first;
5499 label_anchor = &label_first;
5501 statement_t *const body = parse_compound_statement(false);
5502 function->statement = body;
5505 check_declarations();
5506 if (is_warn_on(WARN_RETURN_TYPE) ||
5507 is_warn_on(WARN_UNREACHABLE_CODE) ||
5508 (is_warn_on(WARN_MISSING_NORETURN) && !(function->base.modifiers & DM_NORETURN))) {
5509 noreturn_candidate = true;
5510 check_reachable(body);
5511 if (is_warn_on(WARN_UNREACHABLE_CODE))
5512 walk_statements(body, check_unreachable, NULL);
5513 if (noreturn_candidate &&
5514 !(function->base.modifiers & DM_NORETURN)) {
5515 source_position_t const *const pos = &body->base.source_position;
5516 warningf(WARN_MISSING_NORETURN, pos, "function '%#N' is candidate for attribute 'noreturn'", entity);
5520 assert(current_parent == NULL);
5521 assert(current_function == function);
5522 assert(current_entity == entity);
5523 current_entity = old_current_entity;
5524 current_function = old_current_function;
5525 label_pop_to(label_stack_top);
5528 assert(current_scope == &function->parameters);
5529 scope_pop(old_scope);
5530 environment_pop_to(top);
5533 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5534 source_position_t *source_position,
5535 const symbol_t *symbol)
5537 type_t *type = allocate_type_zero(TYPE_BITFIELD);
5539 type->bitfield.base_type = base_type;
5540 type->bitfield.size_expression = size;
5543 type_t *skipped_type = skip_typeref(base_type);
5544 if (!is_type_integer(skipped_type)) {
5545 errorf(source_position, "bitfield base type '%T' is not an integer type", base_type);
5548 bit_size = get_type_size(base_type) * 8;
5551 if (is_constant_expression(size) == EXPR_CLASS_CONSTANT) {
5552 long v = fold_constant_to_int(size);
5553 const symbol_t *user_symbol = symbol == NULL ? sym_anonymous : symbol;
5556 errorf(source_position, "negative width in bit-field '%Y'",
5558 } else if (v == 0 && symbol != NULL) {
5559 errorf(source_position, "zero width for bit-field '%Y'",
5561 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
5562 errorf(source_position, "width of '%Y' exceeds its type",
5565 type->bitfield.bit_size = v;
5572 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
5574 entity_t *iter = compound->members.entities;
5575 for (; iter != NULL; iter = iter->base.next) {
5576 if (iter->kind != ENTITY_COMPOUND_MEMBER)
5579 if (iter->base.symbol == symbol) {
5581 } else if (iter->base.symbol == NULL) {
5582 /* search in anonymous structs and unions */
5583 type_t *type = skip_typeref(iter->declaration.type);
5584 if (is_type_compound(type)) {
5585 if (find_compound_entry(type->compound.compound, symbol)
5596 static void check_deprecated(const source_position_t *source_position,
5597 const entity_t *entity)
5599 if (!is_declaration(entity))
5601 if ((entity->declaration.modifiers & DM_DEPRECATED) == 0)
5604 source_position_t const *const epos = &entity->base.source_position;
5605 char const *const msg = get_deprecated_string(entity->declaration.attributes);
5607 warningf(WARN_DEPRECATED_DECLARATIONS, source_position, "'%N' is deprecated (declared %P): \"%s\"", entity, epos, msg);
5609 warningf(WARN_DEPRECATED_DECLARATIONS, source_position, "'%N' is deprecated (declared %P)", entity, epos);
5614 static expression_t *create_select(const source_position_t *pos,
5616 type_qualifiers_t qualifiers,
5619 assert(entry->kind == ENTITY_COMPOUND_MEMBER);
5621 check_deprecated(pos, entry);
5623 expression_t *select = allocate_expression_zero(EXPR_SELECT);
5624 select->select.compound = addr;
5625 select->select.compound_entry = entry;
5627 type_t *entry_type = entry->declaration.type;
5628 type_t *res_type = get_qualified_type(entry_type, qualifiers);
5630 /* we always do the auto-type conversions; the & and sizeof parser contains
5631 * code to revert this! */
5632 select->base.type = automatic_type_conversion(res_type);
5633 if (res_type->kind == TYPE_BITFIELD) {
5634 select->base.type = res_type->bitfield.base_type;
5641 * Find entry with symbol in compound. Search anonymous structs and unions and
5642 * creates implicit select expressions for them.
5643 * Returns the adress for the innermost compound.
5645 static expression_t *find_create_select(const source_position_t *pos,
5647 type_qualifiers_t qualifiers,
5648 compound_t *compound, symbol_t *symbol)
5650 entity_t *iter = compound->members.entities;
5651 for (; iter != NULL; iter = iter->base.next) {
5652 if (iter->kind != ENTITY_COMPOUND_MEMBER)
5655 symbol_t *iter_symbol = iter->base.symbol;
5656 if (iter_symbol == NULL) {
5657 type_t *type = iter->declaration.type;
5658 if (type->kind != TYPE_COMPOUND_STRUCT
5659 && type->kind != TYPE_COMPOUND_UNION)
5662 compound_t *sub_compound = type->compound.compound;
5664 if (find_compound_entry(sub_compound, symbol) == NULL)
5667 expression_t *sub_addr = create_select(pos, addr, qualifiers, iter);
5668 sub_addr->base.source_position = *pos;
5669 sub_addr->select.implicit = true;
5670 return find_create_select(pos, sub_addr, qualifiers, sub_compound,
5674 if (iter_symbol == symbol) {
5675 return create_select(pos, addr, qualifiers, iter);
5682 static void parse_compound_declarators(compound_t *compound,
5683 const declaration_specifiers_t *specifiers)
5688 if (token.type == ':') {
5689 source_position_t source_position = *HERE;
5692 type_t *base_type = specifiers->type;
5693 expression_t *size = parse_constant_expression();
5695 type_t *type = make_bitfield_type(base_type, size,
5696 &source_position, NULL);
5698 attribute_t *attributes = parse_attributes(NULL);
5699 attribute_t **anchor = &attributes;
5700 while (*anchor != NULL)
5701 anchor = &(*anchor)->next;
5702 *anchor = specifiers->attributes;
5704 entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER, NAMESPACE_NORMAL, NULL);
5705 entity->base.source_position = source_position;
5706 entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
5707 entity->declaration.storage_class = STORAGE_CLASS_NONE;
5708 entity->declaration.type = type;
5709 entity->declaration.attributes = attributes;
5711 if (attributes != NULL) {
5712 handle_entity_attributes(attributes, entity);
5714 append_entity(&compound->members, entity);
5716 entity = parse_declarator(specifiers,
5717 DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
5718 source_position_t const *const pos = &entity->base.source_position;
5719 if (entity->kind == ENTITY_TYPEDEF) {
5720 errorf(pos, "typedef not allowed as compound member");
5722 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
5724 /* make sure we don't define a symbol multiple times */
5725 symbol_t *symbol = entity->base.symbol;
5726 if (symbol != NULL) {
5727 entity_t *prev = find_compound_entry(compound, symbol);
5729 source_position_t const *const ppos = &prev->base.source_position;
5730 errorf(pos, "multiple declarations of symbol '%Y' (declared %P)", symbol, ppos);
5734 if (token.type == ':') {
5735 source_position_t source_position = *HERE;
5737 expression_t *size = parse_constant_expression();
5739 type_t *type = entity->declaration.type;
5740 type_t *bitfield_type = make_bitfield_type(type, size,
5741 &source_position, entity->base.symbol);
5743 attribute_t *attributes = parse_attributes(NULL);
5744 entity->declaration.type = bitfield_type;
5745 handle_entity_attributes(attributes, entity);
5747 type_t *orig_type = entity->declaration.type;
5748 type_t *type = skip_typeref(orig_type);
5749 if (is_type_function(type)) {
5750 errorf(pos, "'%N' must not have function type '%T'", entity, orig_type);
5751 } else if (is_type_incomplete(type)) {
5752 /* §6.7.2.1:16 flexible array member */
5753 if (!is_type_array(type) ||
5754 token.type != ';' ||
5755 look_ahead(1)->type != '}') {
5756 errorf(pos, "'%N' has incomplete type '%T'", entity, orig_type);
5761 append_entity(&compound->members, entity);
5764 } while (next_if(','));
5765 expect(';', end_error);
5768 anonymous_entity = NULL;
5771 static void parse_compound_type_entries(compound_t *compound)
5774 add_anchor_token('}');
5776 while (token.type != '}') {
5777 if (token.type == T_EOF) {
5778 errorf(HERE, "EOF while parsing struct");
5781 declaration_specifiers_t specifiers;
5782 parse_declaration_specifiers(&specifiers);
5783 parse_compound_declarators(compound, &specifiers);
5785 rem_anchor_token('}');
5789 compound->complete = true;
5792 static type_t *parse_typename(void)
5794 declaration_specifiers_t specifiers;
5795 parse_declaration_specifiers(&specifiers);
5796 if (specifiers.storage_class != STORAGE_CLASS_NONE
5797 || specifiers.thread_local) {
5798 /* TODO: improve error message, user does probably not know what a
5799 * storage class is...
5801 errorf(&specifiers.source_position, "typename must not have a storage class");
5804 type_t *result = parse_abstract_declarator(specifiers.type);
5812 typedef expression_t* (*parse_expression_function)(void);
5813 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
5815 typedef struct expression_parser_function_t expression_parser_function_t;
5816 struct expression_parser_function_t {
5817 parse_expression_function parser;
5818 precedence_t infix_precedence;
5819 parse_expression_infix_function infix_parser;
5822 static expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5825 * Prints an error message if an expression was expected but not read
5827 static expression_t *expected_expression_error(void)
5829 /* skip the error message if the error token was read */
5830 if (token.type != T_ERROR) {
5831 errorf(HERE, "expected expression, got token %K", &token);
5835 return create_invalid_expression();
5838 static type_t *get_string_type(void)
5840 return is_warn_on(WARN_WRITE_STRINGS) ? type_const_char_ptr : type_char_ptr;
5843 static type_t *get_wide_string_type(void)
5845 return is_warn_on(WARN_WRITE_STRINGS) ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5849 * Parse a string constant.
5851 static expression_t *parse_string_literal(void)
5853 source_position_t begin = token.source_position;
5854 string_t res = token.literal;
5855 bool is_wide = (token.type == T_WIDE_STRING_LITERAL);
5858 while (token.type == T_STRING_LITERAL
5859 || token.type == T_WIDE_STRING_LITERAL) {
5860 warn_string_concat(&token.source_position);
5861 res = concat_strings(&res, &token.literal);
5863 is_wide |= token.type == T_WIDE_STRING_LITERAL;
5866 expression_t *literal;
5868 literal = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5869 literal->base.type = get_wide_string_type();
5871 literal = allocate_expression_zero(EXPR_STRING_LITERAL);
5872 literal->base.type = get_string_type();
5874 literal->base.source_position = begin;
5875 literal->literal.value = res;
5881 * Parse a boolean constant.
5883 static expression_t *parse_boolean_literal(bool value)
5885 expression_t *literal = allocate_expression_zero(EXPR_LITERAL_BOOLEAN);
5886 literal->base.source_position = token.source_position;
5887 literal->base.type = type_bool;
5888 literal->literal.value.begin = value ? "true" : "false";
5889 literal->literal.value.size = value ? 4 : 5;
5895 static void warn_traditional_suffix(void)
5897 warningf(WARN_TRADITIONAL, HERE, "traditional C rejects the '%Y' suffix", token.symbol);
5900 static void check_integer_suffix(void)
5902 symbol_t *suffix = token.symbol;
5906 bool not_traditional = false;
5907 const char *c = suffix->string;
5908 if (*c == 'l' || *c == 'L') {
5911 not_traditional = true;
5913 if (*c == 'u' || *c == 'U') {
5916 } else if (*c == 'u' || *c == 'U') {
5917 not_traditional = true;
5920 } else if (*c == 'u' || *c == 'U') {
5921 not_traditional = true;
5923 if (*c == 'l' || *c == 'L') {
5931 errorf(&token.source_position,
5932 "invalid suffix '%s' on integer constant", suffix->string);
5933 } else if (not_traditional) {
5934 warn_traditional_suffix();
5938 static type_t *check_floatingpoint_suffix(void)
5940 symbol_t *suffix = token.symbol;
5941 type_t *type = type_double;
5945 bool not_traditional = false;
5946 const char *c = suffix->string;
5947 if (*c == 'f' || *c == 'F') {
5950 } else if (*c == 'l' || *c == 'L') {
5952 type = type_long_double;
5955 errorf(&token.source_position,
5956 "invalid suffix '%s' on floatingpoint constant", suffix->string);
5957 } else if (not_traditional) {
5958 warn_traditional_suffix();
5965 * Parse an integer constant.
5967 static expression_t *parse_number_literal(void)
5969 expression_kind_t kind;
5972 switch (token.type) {
5974 kind = EXPR_LITERAL_INTEGER;
5975 check_integer_suffix();
5978 case T_INTEGER_OCTAL:
5979 kind = EXPR_LITERAL_INTEGER_OCTAL;
5980 check_integer_suffix();
5983 case T_INTEGER_HEXADECIMAL:
5984 kind = EXPR_LITERAL_INTEGER_HEXADECIMAL;
5985 check_integer_suffix();
5988 case T_FLOATINGPOINT:
5989 kind = EXPR_LITERAL_FLOATINGPOINT;
5990 type = check_floatingpoint_suffix();
5992 case T_FLOATINGPOINT_HEXADECIMAL:
5993 kind = EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL;
5994 type = check_floatingpoint_suffix();
5997 panic("unexpected token type in parse_number_literal");
6000 expression_t *literal = allocate_expression_zero(kind);
6001 literal->base.source_position = token.source_position;
6002 literal->base.type = type;
6003 literal->literal.value = token.literal;
6004 literal->literal.suffix = token.symbol;
6007 /* integer type depends on the size of the number and the size
6008 * representable by the types. The backend/codegeneration has to determine
6011 determine_literal_type(&literal->literal);
6016 * Parse a character constant.
6018 static expression_t *parse_character_constant(void)
6020 expression_t *literal = allocate_expression_zero(EXPR_LITERAL_CHARACTER);
6021 literal->base.source_position = token.source_position;
6022 literal->base.type = c_mode & _CXX ? type_char : type_int;
6023 literal->literal.value = token.literal;
6025 size_t len = literal->literal.value.size;
6027 if (!GNU_MODE && !(c_mode & _C99)) {
6028 errorf(HERE, "more than 1 character in character constant");
6030 literal->base.type = type_int;
6031 warningf(WARN_MULTICHAR, HERE, "multi-character character constant");
6040 * Parse a wide character constant.
6042 static expression_t *parse_wide_character_constant(void)
6044 expression_t *literal = allocate_expression_zero(EXPR_LITERAL_WIDE_CHARACTER);
6045 literal->base.source_position = token.source_position;
6046 literal->base.type = type_int;
6047 literal->literal.value = token.literal;
6049 size_t len = wstrlen(&literal->literal.value);
6051 warningf(WARN_MULTICHAR, HERE, "multi-character character constant");
6058 static entity_t *create_implicit_function(symbol_t *symbol,
6059 const source_position_t *source_position)
6061 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
6062 ntype->function.return_type = type_int;
6063 ntype->function.unspecified_parameters = true;
6064 ntype->function.linkage = LINKAGE_C;
6065 type_t *type = identify_new_type(ntype);
6067 entity_t *const entity = allocate_entity_zero(ENTITY_FUNCTION, NAMESPACE_NORMAL, symbol);
6068 entity->declaration.storage_class = STORAGE_CLASS_EXTERN;
6069 entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6070 entity->declaration.type = type;
6071 entity->declaration.implicit = true;
6072 entity->base.source_position = *source_position;
6074 if (current_scope != NULL)
6075 record_entity(entity, false);
6081 * Performs automatic type cast as described in §6.3.2.1.
6083 * @param orig_type the original type
6085 static type_t *automatic_type_conversion(type_t *orig_type)
6087 type_t *type = skip_typeref(orig_type);
6088 if (is_type_array(type)) {
6089 array_type_t *array_type = &type->array;
6090 type_t *element_type = array_type->element_type;
6091 unsigned qualifiers = array_type->base.qualifiers;
6093 return make_pointer_type(element_type, qualifiers);
6096 if (is_type_function(type)) {
6097 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6104 * reverts the automatic casts of array to pointer types and function
6105 * to function-pointer types as defined §6.3.2.1
6107 type_t *revert_automatic_type_conversion(const expression_t *expression)
6109 switch (expression->kind) {
6110 case EXPR_REFERENCE: {
6111 entity_t *entity = expression->reference.entity;
6112 if (is_declaration(entity)) {
6113 return entity->declaration.type;
6114 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6115 return entity->enum_value.enum_type;
6117 panic("no declaration or enum in reference");
6122 entity_t *entity = expression->select.compound_entry;
6123 assert(is_declaration(entity));
6124 type_t *type = entity->declaration.type;
6125 return get_qualified_type(type,
6126 expression->base.type->base.qualifiers);
6129 case EXPR_UNARY_DEREFERENCE: {
6130 const expression_t *const value = expression->unary.value;
6131 type_t *const type = skip_typeref(value->base.type);
6132 if (!is_type_pointer(type))
6133 return type_error_type;
6134 return type->pointer.points_to;
6137 case EXPR_ARRAY_ACCESS: {
6138 const expression_t *array_ref = expression->array_access.array_ref;
6139 type_t *type_left = skip_typeref(array_ref->base.type);
6140 if (!is_type_pointer(type_left))
6141 return type_error_type;
6142 return type_left->pointer.points_to;
6145 case EXPR_STRING_LITERAL: {
6146 size_t size = expression->string_literal.value.size;
6147 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6150 case EXPR_WIDE_STRING_LITERAL: {
6151 size_t size = wstrlen(&expression->string_literal.value);
6152 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6155 case EXPR_COMPOUND_LITERAL:
6156 return expression->compound_literal.type;
6161 return expression->base.type;
6165 * Find an entity matching a symbol in a scope.
6166 * Uses current scope if scope is NULL
6168 static entity_t *lookup_entity(const scope_t *scope, symbol_t *symbol,
6169 namespace_tag_t namespc)
6171 if (scope == NULL) {
6172 return get_entity(symbol, namespc);
6175 /* we should optimize here, if scope grows above a certain size we should
6176 construct a hashmap here... */
6177 entity_t *entity = scope->entities;
6178 for ( ; entity != NULL; entity = entity->base.next) {
6179 if (entity->base.symbol == symbol
6180 && (namespace_tag_t)entity->base.namespc == namespc)
6187 static entity_t *parse_qualified_identifier(void)
6189 /* namespace containing the symbol */
6191 source_position_t pos;
6192 const scope_t *lookup_scope = NULL;
6194 if (next_if(T_COLONCOLON))
6195 lookup_scope = &unit->scope;
6199 if (token.type != T_IDENTIFIER) {
6200 parse_error_expected("while parsing identifier", T_IDENTIFIER, NULL);
6201 return create_error_entity(sym_anonymous, ENTITY_VARIABLE);
6203 symbol = token.symbol;
6208 entity = lookup_entity(lookup_scope, symbol, NAMESPACE_NORMAL);
6210 if (!next_if(T_COLONCOLON))
6213 switch (entity->kind) {
6214 case ENTITY_NAMESPACE:
6215 lookup_scope = &entity->namespacee.members;
6220 lookup_scope = &entity->compound.members;
6223 errorf(&pos, "'%Y' must be a namespace, class, struct or union (but is a %s)",
6224 symbol, get_entity_kind_name(entity->kind));
6226 /* skip further qualifications */
6227 while (next_if(T_IDENTIFIER) && next_if(T_COLONCOLON)) {}
6229 return create_error_entity(sym_anonymous, ENTITY_VARIABLE);
6233 if (entity == NULL) {
6234 if (!strict_mode && token.type == '(') {
6235 /* an implicitly declared function */
6236 warningf(WARN_IMPLICIT_FUNCTION_DECLARATION, &pos, "implicit declaration of function '%Y'", symbol);
6237 entity = create_implicit_function(symbol, &pos);
6239 errorf(&pos, "unknown identifier '%Y' found.", symbol);
6240 entity = create_error_entity(symbol, ENTITY_VARIABLE);
6247 static expression_t *parse_reference(void)
6249 source_position_t const pos = token.source_position;
6250 entity_t *const entity = parse_qualified_identifier();
6253 if (is_declaration(entity)) {
6254 orig_type = entity->declaration.type;
6255 } else if (entity->kind == ENTITY_ENUM_VALUE) {
6256 orig_type = entity->enum_value.enum_type;
6258 panic("expected declaration or enum value in reference");
6261 /* we always do the auto-type conversions; the & and sizeof parser contains
6262 * code to revert this! */
6263 type_t *type = automatic_type_conversion(orig_type);
6265 expression_kind_t kind = EXPR_REFERENCE;
6266 if (entity->kind == ENTITY_ENUM_VALUE)
6267 kind = EXPR_REFERENCE_ENUM_VALUE;
6269 expression_t *expression = allocate_expression_zero(kind);
6270 expression->base.source_position = pos;
6271 expression->base.type = type;
6272 expression->reference.entity = entity;
6274 /* this declaration is used */
6275 if (is_declaration(entity)) {
6276 entity->declaration.used = true;
6279 if (entity->base.parent_scope != file_scope
6280 && (current_function != NULL
6281 && entity->base.parent_scope->depth < current_function->parameters.depth)
6282 && (entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER)) {
6283 if (entity->kind == ENTITY_VARIABLE) {
6284 /* access of a variable from an outer function */
6285 entity->variable.address_taken = true;
6286 } else if (entity->kind == ENTITY_PARAMETER) {
6287 entity->parameter.address_taken = true;
6289 current_function->need_closure = true;
6292 check_deprecated(&pos, entity);
6294 if (entity == current_init_decl && !in_type_prop && entity->kind == ENTITY_VARIABLE) {
6295 current_init_decl = NULL;
6296 warningf(WARN_INIT_SELF, &pos, "variable '%#N' is initialized by itself", entity);
6302 static bool semantic_cast(expression_t *cast)
6304 expression_t *expression = cast->unary.value;
6305 type_t *orig_dest_type = cast->base.type;
6306 type_t *orig_type_right = expression->base.type;
6307 type_t const *dst_type = skip_typeref(orig_dest_type);
6308 type_t const *src_type = skip_typeref(orig_type_right);
6309 source_position_t const *pos = &cast->base.source_position;
6311 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6312 if (dst_type == type_void)
6315 /* only integer and pointer can be casted to pointer */
6316 if (is_type_pointer(dst_type) &&
6317 !is_type_pointer(src_type) &&
6318 !is_type_integer(src_type) &&
6319 is_type_valid(src_type)) {
6320 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6324 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6325 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6329 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6330 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6334 if (is_type_pointer(src_type) && is_type_pointer(dst_type)) {
6335 type_t *src = skip_typeref(src_type->pointer.points_to);
6336 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6337 unsigned missing_qualifiers =
6338 src->base.qualifiers & ~dst->base.qualifiers;
6339 if (missing_qualifiers != 0) {
6340 warningf(WARN_CAST_QUAL, pos, "cast discards qualifiers '%Q' in pointer target type of '%T'", missing_qualifiers, orig_type_right);
6346 static expression_t *parse_compound_literal(type_t *type)
6348 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6350 parse_initializer_env_t env;
6353 env.must_be_constant = false;
6354 initializer_t *initializer = parse_initializer(&env);
6357 expression->compound_literal.initializer = initializer;
6358 expression->compound_literal.type = type;
6359 expression->base.type = automatic_type_conversion(type);
6365 * Parse a cast expression.
6367 static expression_t *parse_cast(void)
6369 source_position_t source_position = token.source_position;
6372 add_anchor_token(')');
6374 type_t *type = parse_typename();
6376 rem_anchor_token(')');
6377 expect(')', end_error);
6379 if (token.type == '{') {
6380 return parse_compound_literal(type);
6383 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6384 cast->base.source_position = source_position;
6386 expression_t *value = parse_subexpression(PREC_CAST);
6387 cast->base.type = type;
6388 cast->unary.value = value;
6390 if (! semantic_cast(cast)) {
6391 /* TODO: record the error in the AST. else it is impossible to detect it */
6396 return create_invalid_expression();
6400 * Parse a statement expression.
6402 static expression_t *parse_statement_expression(void)
6404 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6407 add_anchor_token(')');
6409 statement_t *statement = parse_compound_statement(true);
6410 statement->compound.stmt_expr = true;
6411 expression->statement.statement = statement;
6413 /* find last statement and use its type */
6414 type_t *type = type_void;
6415 const statement_t *stmt = statement->compound.statements;
6417 while (stmt->base.next != NULL)
6418 stmt = stmt->base.next;
6420 if (stmt->kind == STATEMENT_EXPRESSION) {
6421 type = stmt->expression.expression->base.type;
6424 source_position_t const *const pos = &expression->base.source_position;
6425 warningf(WARN_OTHER, pos, "empty statement expression ({})");
6427 expression->base.type = type;
6429 rem_anchor_token(')');
6430 expect(')', end_error);
6437 * Parse a parenthesized expression.
6439 static expression_t *parse_parenthesized_expression(void)
6441 token_t const* const la1 = look_ahead(1);
6442 switch (la1->type) {
6444 /* gcc extension: a statement expression */
6445 return parse_statement_expression();
6448 if (is_typedef_symbol(la1->symbol)) {
6450 return parse_cast();
6455 add_anchor_token(')');
6456 expression_t *result = parse_expression();
6457 result->base.parenthesized = true;
6458 rem_anchor_token(')');
6459 expect(')', end_error);
6465 static expression_t *parse_function_keyword(void)
6469 if (current_function == NULL) {
6470 errorf(HERE, "'__func__' used outside of a function");
6473 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6474 expression->base.type = type_char_ptr;
6475 expression->funcname.kind = FUNCNAME_FUNCTION;
6482 static expression_t *parse_pretty_function_keyword(void)
6484 if (current_function == NULL) {
6485 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6488 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6489 expression->base.type = type_char_ptr;
6490 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6492 eat(T___PRETTY_FUNCTION__);
6497 static expression_t *parse_funcsig_keyword(void)
6499 if (current_function == NULL) {
6500 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6503 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6504 expression->base.type = type_char_ptr;
6505 expression->funcname.kind = FUNCNAME_FUNCSIG;
6512 static expression_t *parse_funcdname_keyword(void)
6514 if (current_function == NULL) {
6515 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6518 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6519 expression->base.type = type_char_ptr;
6520 expression->funcname.kind = FUNCNAME_FUNCDNAME;
6522 eat(T___FUNCDNAME__);
6527 static designator_t *parse_designator(void)
6529 designator_t *result = allocate_ast_zero(sizeof(result[0]));
6530 result->source_position = *HERE;
6532 if (token.type != T_IDENTIFIER) {
6533 parse_error_expected("while parsing member designator",
6534 T_IDENTIFIER, NULL);
6537 result->symbol = token.symbol;
6540 designator_t *last_designator = result;
6543 if (token.type != T_IDENTIFIER) {
6544 parse_error_expected("while parsing member designator",
6545 T_IDENTIFIER, NULL);
6548 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6549 designator->source_position = *HERE;
6550 designator->symbol = token.symbol;
6553 last_designator->next = designator;
6554 last_designator = designator;
6558 add_anchor_token(']');
6559 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6560 designator->source_position = *HERE;
6561 designator->array_index = parse_expression();
6562 rem_anchor_token(']');
6563 expect(']', end_error);
6564 if (designator->array_index == NULL) {
6568 last_designator->next = designator;
6569 last_designator = designator;
6581 * Parse the __builtin_offsetof() expression.
6583 static expression_t *parse_offsetof(void)
6585 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6586 expression->base.type = type_size_t;
6588 eat(T___builtin_offsetof);
6590 expect('(', end_error);
6591 add_anchor_token(',');
6592 type_t *type = parse_typename();
6593 rem_anchor_token(',');
6594 expect(',', end_error);
6595 add_anchor_token(')');
6596 designator_t *designator = parse_designator();
6597 rem_anchor_token(')');
6598 expect(')', end_error);
6600 expression->offsetofe.type = type;
6601 expression->offsetofe.designator = designator;
6604 memset(&path, 0, sizeof(path));
6605 path.top_type = type;
6606 path.path = NEW_ARR_F(type_path_entry_t, 0);
6608 descend_into_subtype(&path);
6610 if (!walk_designator(&path, designator, true)) {
6611 return create_invalid_expression();
6614 DEL_ARR_F(path.path);
6618 return create_invalid_expression();
6622 * Parses a _builtin_va_start() expression.
6624 static expression_t *parse_va_start(void)
6626 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6628 eat(T___builtin_va_start);
6630 expect('(', end_error);
6631 add_anchor_token(',');
6632 expression->va_starte.ap = parse_assignment_expression();
6633 rem_anchor_token(',');
6634 expect(',', end_error);
6635 expression_t *const expr = parse_assignment_expression();
6636 if (expr->kind == EXPR_REFERENCE) {
6637 entity_t *const entity = expr->reference.entity;
6638 if (!current_function->base.type->function.variadic) {
6639 errorf(&expr->base.source_position,
6640 "'va_start' used in non-variadic function");
6641 } else if (entity->base.parent_scope != ¤t_function->parameters ||
6642 entity->base.next != NULL ||
6643 entity->kind != ENTITY_PARAMETER) {
6644 errorf(&expr->base.source_position,
6645 "second argument of 'va_start' must be last parameter of the current function");
6647 expression->va_starte.parameter = &entity->variable;
6649 expect(')', end_error);
6652 expect(')', end_error);
6654 return create_invalid_expression();
6658 * Parses a __builtin_va_arg() expression.
6660 static expression_t *parse_va_arg(void)
6662 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6664 eat(T___builtin_va_arg);
6666 expect('(', end_error);
6668 ap.expression = parse_assignment_expression();
6669 expression->va_arge.ap = ap.expression;
6670 check_call_argument(type_valist, &ap, 1);
6672 expect(',', end_error);
6673 expression->base.type = parse_typename();
6674 expect(')', end_error);
6678 return create_invalid_expression();
6682 * Parses a __builtin_va_copy() expression.
6684 static expression_t *parse_va_copy(void)
6686 expression_t *expression = allocate_expression_zero(EXPR_VA_COPY);
6688 eat(T___builtin_va_copy);
6690 expect('(', end_error);
6691 expression_t *dst = parse_assignment_expression();
6692 assign_error_t error = semantic_assign(type_valist, dst);
6693 report_assign_error(error, type_valist, dst, "call argument 1",
6694 &dst->base.source_position);
6695 expression->va_copye.dst = dst;
6697 expect(',', end_error);
6699 call_argument_t src;
6700 src.expression = parse_assignment_expression();
6701 check_call_argument(type_valist, &src, 2);
6702 expression->va_copye.src = src.expression;
6703 expect(')', end_error);
6707 return create_invalid_expression();
6711 * Parses a __builtin_constant_p() expression.
6713 static expression_t *parse_builtin_constant(void)
6715 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6717 eat(T___builtin_constant_p);
6719 expect('(', end_error);
6720 add_anchor_token(')');
6721 expression->builtin_constant.value = parse_assignment_expression();
6722 rem_anchor_token(')');
6723 expect(')', end_error);
6724 expression->base.type = type_int;
6728 return create_invalid_expression();
6732 * Parses a __builtin_types_compatible_p() expression.
6734 static expression_t *parse_builtin_types_compatible(void)
6736 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_TYPES_COMPATIBLE_P);
6738 eat(T___builtin_types_compatible_p);
6740 expect('(', end_error);
6741 add_anchor_token(')');
6742 add_anchor_token(',');
6743 expression->builtin_types_compatible.left = parse_typename();
6744 rem_anchor_token(',');
6745 expect(',', end_error);
6746 expression->builtin_types_compatible.right = parse_typename();
6747 rem_anchor_token(')');
6748 expect(')', end_error);
6749 expression->base.type = type_int;
6753 return create_invalid_expression();
6757 * Parses a __builtin_is_*() compare expression.
6759 static expression_t *parse_compare_builtin(void)
6761 expression_t *expression;
6763 switch (token.type) {
6764 case T___builtin_isgreater:
6765 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6767 case T___builtin_isgreaterequal:
6768 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6770 case T___builtin_isless:
6771 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6773 case T___builtin_islessequal:
6774 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6776 case T___builtin_islessgreater:
6777 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6779 case T___builtin_isunordered:
6780 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6783 internal_errorf(HERE, "invalid compare builtin found");
6785 expression->base.source_position = *HERE;
6788 expect('(', end_error);
6789 expression->binary.left = parse_assignment_expression();
6790 expect(',', end_error);
6791 expression->binary.right = parse_assignment_expression();
6792 expect(')', end_error);
6794 type_t *const orig_type_left = expression->binary.left->base.type;
6795 type_t *const orig_type_right = expression->binary.right->base.type;
6797 type_t *const type_left = skip_typeref(orig_type_left);
6798 type_t *const type_right = skip_typeref(orig_type_right);
6799 if (!is_type_float(type_left) && !is_type_float(type_right)) {
6800 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6801 type_error_incompatible("invalid operands in comparison",
6802 &expression->base.source_position, orig_type_left, orig_type_right);
6805 semantic_comparison(&expression->binary);
6810 return create_invalid_expression();
6814 * Parses a MS assume() expression.
6816 static expression_t *parse_assume(void)
6818 expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
6822 expect('(', end_error);
6823 add_anchor_token(')');
6824 expression->unary.value = parse_assignment_expression();
6825 rem_anchor_token(')');
6826 expect(')', end_error);
6828 expression->base.type = type_void;
6831 return create_invalid_expression();
6835 * Return the label for the current symbol or create a new one.
6837 static label_t *get_label(void)
6839 assert(token.type == T_IDENTIFIER);
6840 assert(current_function != NULL);
6842 entity_t *label = get_entity(token.symbol, NAMESPACE_LABEL);
6843 /* If we find a local label, we already created the declaration. */
6844 if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
6845 if (label->base.parent_scope != current_scope) {
6846 assert(label->base.parent_scope->depth < current_scope->depth);
6847 current_function->goto_to_outer = true;
6849 } else if (label == NULL || label->base.parent_scope != ¤t_function->parameters) {
6850 /* There is no matching label in the same function, so create a new one. */
6851 label = allocate_entity_zero(ENTITY_LABEL, NAMESPACE_LABEL, token.symbol);
6856 return &label->label;
6860 * Parses a GNU && label address expression.
6862 static expression_t *parse_label_address(void)
6864 source_position_t source_position = token.source_position;
6866 if (token.type != T_IDENTIFIER) {
6867 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6868 return create_invalid_expression();
6871 label_t *const label = get_label();
6873 label->address_taken = true;
6875 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6876 expression->base.source_position = source_position;
6878 /* label address is treated as a void pointer */
6879 expression->base.type = type_void_ptr;
6880 expression->label_address.label = label;
6885 * Parse a microsoft __noop expression.
6887 static expression_t *parse_noop_expression(void)
6889 /* the result is a (int)0 */
6890 expression_t *literal = allocate_expression_zero(EXPR_LITERAL_MS_NOOP);
6891 literal->base.type = type_int;
6892 literal->base.source_position = token.source_position;
6893 literal->literal.value.begin = "__noop";
6894 literal->literal.value.size = 6;
6898 if (token.type == '(') {
6899 /* parse arguments */
6901 add_anchor_token(')');
6902 add_anchor_token(',');
6904 if (token.type != ')') do {
6905 (void)parse_assignment_expression();
6906 } while (next_if(','));
6908 rem_anchor_token(',');
6909 rem_anchor_token(')');
6910 expect(')', end_error);
6917 * Parses a primary expression.
6919 static expression_t *parse_primary_expression(void)
6921 switch (token.type) {
6922 case T_false: return parse_boolean_literal(false);
6923 case T_true: return parse_boolean_literal(true);
6925 case T_INTEGER_OCTAL:
6926 case T_INTEGER_HEXADECIMAL:
6927 case T_FLOATINGPOINT:
6928 case T_FLOATINGPOINT_HEXADECIMAL: return parse_number_literal();
6929 case T_CHARACTER_CONSTANT: return parse_character_constant();
6930 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
6931 case T_STRING_LITERAL:
6932 case T_WIDE_STRING_LITERAL: return parse_string_literal();
6933 case T___FUNCTION__:
6934 case T___func__: return parse_function_keyword();
6935 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
6936 case T___FUNCSIG__: return parse_funcsig_keyword();
6937 case T___FUNCDNAME__: return parse_funcdname_keyword();
6938 case T___builtin_offsetof: return parse_offsetof();
6939 case T___builtin_va_start: return parse_va_start();
6940 case T___builtin_va_arg: return parse_va_arg();
6941 case T___builtin_va_copy: return parse_va_copy();
6942 case T___builtin_isgreater:
6943 case T___builtin_isgreaterequal:
6944 case T___builtin_isless:
6945 case T___builtin_islessequal:
6946 case T___builtin_islessgreater:
6947 case T___builtin_isunordered: return parse_compare_builtin();
6948 case T___builtin_constant_p: return parse_builtin_constant();
6949 case T___builtin_types_compatible_p: return parse_builtin_types_compatible();
6950 case T__assume: return parse_assume();
6953 return parse_label_address();
6956 case '(': return parse_parenthesized_expression();
6957 case T___noop: return parse_noop_expression();
6959 /* Gracefully handle type names while parsing expressions. */
6961 return parse_reference();
6963 if (!is_typedef_symbol(token.symbol)) {
6964 return parse_reference();
6968 source_position_t const pos = *HERE;
6969 declaration_specifiers_t specifiers;
6970 parse_declaration_specifiers(&specifiers);
6971 type_t const *const type = parse_abstract_declarator(specifiers.type);
6972 errorf(&pos, "encountered type '%T' while parsing expression", type);
6973 return create_invalid_expression();
6977 errorf(HERE, "unexpected token %K, expected an expression", &token);
6979 return create_invalid_expression();
6982 static expression_t *parse_array_expression(expression_t *left)
6984 expression_t *const expr = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6985 array_access_expression_t *const arr = &expr->array_access;
6988 add_anchor_token(']');
6990 expression_t *const inside = parse_expression();
6992 type_t *const orig_type_left = left->base.type;
6993 type_t *const orig_type_inside = inside->base.type;
6995 type_t *const type_left = skip_typeref(orig_type_left);
6996 type_t *const type_inside = skip_typeref(orig_type_inside);
7002 if (is_type_pointer(type_left)) {
7005 idx_type = type_inside;
7006 res_type = type_left->pointer.points_to;
7008 } else if (is_type_pointer(type_inside)) {
7009 arr->flipped = true;
7012 idx_type = type_left;
7013 res_type = type_inside->pointer.points_to;
7015 res_type = automatic_type_conversion(res_type);
7016 if (!is_type_integer(idx_type)) {
7017 errorf(&idx->base.source_position, "array subscript must have integer type");
7018 } else if (is_type_atomic(idx_type, ATOMIC_TYPE_CHAR)) {
7019 source_position_t const *const pos = &idx->base.source_position;
7020 warningf(WARN_CHAR_SUBSCRIPTS, pos, "array subscript has char type");
7023 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7024 errorf(&expr->base.source_position, "invalid types '%T[%T]' for array access", orig_type_left, orig_type_inside);
7026 res_type = type_error_type;
7031 arr->array_ref = ref;
7033 arr->base.type = res_type;
7035 rem_anchor_token(']');
7036 expect(']', end_error);
7041 static expression_t *parse_typeprop(expression_kind_t const kind)
7043 expression_t *tp_expression = allocate_expression_zero(kind);
7044 tp_expression->base.type = type_size_t;
7046 eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7048 /* we only refer to a type property, mark this case */
7049 bool old = in_type_prop;
7050 in_type_prop = true;
7053 expression_t *expression;
7054 if (token.type == '(' && is_declaration_specifier(look_ahead(1))) {
7056 add_anchor_token(')');
7057 orig_type = parse_typename();
7058 rem_anchor_token(')');
7059 expect(')', end_error);
7061 if (token.type == '{') {
7062 /* It was not sizeof(type) after all. It is sizeof of an expression
7063 * starting with a compound literal */
7064 expression = parse_compound_literal(orig_type);
7065 goto typeprop_expression;
7068 expression = parse_subexpression(PREC_UNARY);
7070 typeprop_expression:
7071 tp_expression->typeprop.tp_expression = expression;
7073 orig_type = revert_automatic_type_conversion(expression);
7074 expression->base.type = orig_type;
7077 tp_expression->typeprop.type = orig_type;
7078 type_t const* const type = skip_typeref(orig_type);
7079 char const* wrong_type = NULL;
7080 if (is_type_incomplete(type)) {
7081 if (!is_type_atomic(type, ATOMIC_TYPE_VOID) || !GNU_MODE)
7082 wrong_type = "incomplete";
7083 } else if (type->kind == TYPE_FUNCTION) {
7085 /* function types are allowed (and return 1) */
7086 source_position_t const *const pos = &tp_expression->base.source_position;
7087 char const *const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7088 warningf(WARN_OTHER, pos, "%s expression with function argument returns invalid result", what);
7090 wrong_type = "function";
7093 if (is_type_incomplete(type))
7094 wrong_type = "incomplete";
7096 if (type->kind == TYPE_BITFIELD)
7097 wrong_type = "bitfield";
7099 if (wrong_type != NULL) {
7100 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7101 errorf(&tp_expression->base.source_position,
7102 "operand of %s expression must not be of %s type '%T'",
7103 what, wrong_type, orig_type);
7108 return tp_expression;
7111 static expression_t *parse_sizeof(void)
7113 return parse_typeprop(EXPR_SIZEOF);
7116 static expression_t *parse_alignof(void)
7118 return parse_typeprop(EXPR_ALIGNOF);
7121 static expression_t *parse_select_expression(expression_t *addr)
7123 assert(token.type == '.' || token.type == T_MINUSGREATER);
7124 bool select_left_arrow = (token.type == T_MINUSGREATER);
7125 source_position_t const pos = *HERE;
7128 if (token.type != T_IDENTIFIER) {
7129 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7130 return create_invalid_expression();
7132 symbol_t *symbol = token.symbol;
7135 type_t *const orig_type = addr->base.type;
7136 type_t *const type = skip_typeref(orig_type);
7139 bool saw_error = false;
7140 if (is_type_pointer(type)) {
7141 if (!select_left_arrow) {
7143 "request for member '%Y' in something not a struct or union, but '%T'",
7147 type_left = skip_typeref(type->pointer.points_to);
7149 if (select_left_arrow && is_type_valid(type)) {
7150 errorf(&pos, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7156 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
7157 type_left->kind != TYPE_COMPOUND_UNION) {
7159 if (is_type_valid(type_left) && !saw_error) {
7161 "request for member '%Y' in something not a struct or union, but '%T'",
7164 return create_invalid_expression();
7167 compound_t *compound = type_left->compound.compound;
7168 if (!compound->complete) {
7169 errorf(&pos, "request for member '%Y' in incomplete type '%T'",
7171 return create_invalid_expression();
7174 type_qualifiers_t qualifiers = type_left->base.qualifiers;
7175 expression_t *result =
7176 find_create_select(&pos, addr, qualifiers, compound, symbol);
7178 if (result == NULL) {
7179 errorf(&pos, "'%T' has no member named '%Y'", orig_type, symbol);
7180 return create_invalid_expression();
7186 static void check_call_argument(type_t *expected_type,
7187 call_argument_t *argument, unsigned pos)
7189 type_t *expected_type_skip = skip_typeref(expected_type);
7190 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7191 expression_t *arg_expr = argument->expression;
7192 type_t *arg_type = skip_typeref(arg_expr->base.type);
7194 /* handle transparent union gnu extension */
7195 if (is_type_union(expected_type_skip)
7196 && (get_type_modifiers(expected_type) & DM_TRANSPARENT_UNION)) {
7197 compound_t *union_decl = expected_type_skip->compound.compound;
7198 type_t *best_type = NULL;
7199 entity_t *entry = union_decl->members.entities;
7200 for ( ; entry != NULL; entry = entry->base.next) {
7201 assert(is_declaration(entry));
7202 type_t *decl_type = entry->declaration.type;
7203 error = semantic_assign(decl_type, arg_expr);
7204 if (error == ASSIGN_ERROR_INCOMPATIBLE
7205 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7208 if (error == ASSIGN_SUCCESS) {
7209 best_type = decl_type;
7210 } else if (best_type == NULL) {
7211 best_type = decl_type;
7215 if (best_type != NULL) {
7216 expected_type = best_type;
7220 error = semantic_assign(expected_type, arg_expr);
7221 argument->expression = create_implicit_cast(arg_expr, expected_type);
7223 if (error != ASSIGN_SUCCESS) {
7224 /* report exact scope in error messages (like "in argument 3") */
7226 snprintf(buf, sizeof(buf), "call argument %u", pos);
7227 report_assign_error(error, expected_type, arg_expr, buf,
7228 &arg_expr->base.source_position);
7230 type_t *const promoted_type = get_default_promoted_type(arg_type);
7231 if (!types_compatible(expected_type_skip, promoted_type) &&
7232 !types_compatible(expected_type_skip, type_void_ptr) &&
7233 !types_compatible(type_void_ptr, promoted_type)) {
7234 /* Deliberately show the skipped types in this warning */
7235 source_position_t const *const apos = &arg_expr->base.source_position;
7236 warningf(WARN_TRADITIONAL, apos, "passing call argument %u as '%T' rather than '%T' due to prototype", pos, expected_type_skip, promoted_type);
7242 * Handle the semantic restrictions of builtin calls
7244 static void handle_builtin_argument_restrictions(call_expression_t *call) {
7245 switch (call->function->reference.entity->function.btk) {
7246 case bk_gnu_builtin_return_address:
7247 case bk_gnu_builtin_frame_address: {
7248 /* argument must be constant */
7249 call_argument_t *argument = call->arguments;
7251 if (is_constant_expression(argument->expression) == EXPR_CLASS_VARIABLE) {
7252 errorf(&call->base.source_position,
7253 "argument of '%Y' must be a constant expression",
7254 call->function->reference.entity->base.symbol);
7258 case bk_gnu_builtin_object_size:
7259 if (call->arguments == NULL)
7262 call_argument_t *arg = call->arguments->next;
7263 if (arg != NULL && is_constant_expression(arg->expression) == EXPR_CLASS_VARIABLE) {
7264 errorf(&call->base.source_position,
7265 "second argument of '%Y' must be a constant expression",
7266 call->function->reference.entity->base.symbol);
7269 case bk_gnu_builtin_prefetch:
7270 /* second and third argument must be constant if existent */
7271 if (call->arguments == NULL)
7273 call_argument_t *rw = call->arguments->next;
7274 call_argument_t *locality = NULL;
7277 if (is_constant_expression(rw->expression) == EXPR_CLASS_VARIABLE) {
7278 errorf(&call->base.source_position,
7279 "second argument of '%Y' must be a constant expression",
7280 call->function->reference.entity->base.symbol);
7282 locality = rw->next;
7284 if (locality != NULL) {
7285 if (is_constant_expression(locality->expression) == EXPR_CLASS_VARIABLE) {
7286 errorf(&call->base.source_position,
7287 "third argument of '%Y' must be a constant expression",
7288 call->function->reference.entity->base.symbol);
7290 locality = rw->next;
7299 * Parse a call expression, ie. expression '( ... )'.
7301 * @param expression the function address
7303 static expression_t *parse_call_expression(expression_t *expression)
7305 expression_t *result = allocate_expression_zero(EXPR_CALL);
7306 call_expression_t *call = &result->call;
7307 call->function = expression;
7309 type_t *const orig_type = expression->base.type;
7310 type_t *const type = skip_typeref(orig_type);
7312 function_type_t *function_type = NULL;
7313 if (is_type_pointer(type)) {
7314 type_t *const to_type = skip_typeref(type->pointer.points_to);
7316 if (is_type_function(to_type)) {
7317 function_type = &to_type->function;
7318 call->base.type = function_type->return_type;
7322 if (function_type == NULL && is_type_valid(type)) {
7324 "called object '%E' (type '%T') is not a pointer to a function",
7325 expression, orig_type);
7328 /* parse arguments */
7330 add_anchor_token(')');
7331 add_anchor_token(',');
7333 if (token.type != ')') {
7334 call_argument_t **anchor = &call->arguments;
7336 call_argument_t *argument = allocate_ast_zero(sizeof(*argument));
7337 argument->expression = parse_assignment_expression();
7340 anchor = &argument->next;
7341 } while (next_if(','));
7343 rem_anchor_token(',');
7344 rem_anchor_token(')');
7345 expect(')', end_error);
7347 if (function_type == NULL)
7350 /* check type and count of call arguments */
7351 function_parameter_t *parameter = function_type->parameters;
7352 call_argument_t *argument = call->arguments;
7353 if (!function_type->unspecified_parameters) {
7354 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7355 parameter = parameter->next, argument = argument->next) {
7356 check_call_argument(parameter->type, argument, ++pos);
7359 if (parameter != NULL) {
7360 errorf(&expression->base.source_position, "too few arguments to function '%E'", expression);
7361 } else if (argument != NULL && !function_type->variadic) {
7362 errorf(&argument->expression->base.source_position, "too many arguments to function '%E'", expression);
7366 /* do default promotion for other arguments */
7367 for (; argument != NULL; argument = argument->next) {
7368 type_t *argument_type = argument->expression->base.type;
7369 if (!is_type_object(skip_typeref(argument_type))) {
7370 errorf(&argument->expression->base.source_position,
7371 "call argument '%E' must not be void", argument->expression);
7374 argument_type = get_default_promoted_type(argument_type);
7376 argument->expression
7377 = create_implicit_cast(argument->expression, argument_type);
7382 if (is_type_compound(skip_typeref(function_type->return_type))) {
7383 source_position_t const *const pos = &expression->base.source_position;
7384 warningf(WARN_AGGREGATE_RETURN, pos, "function call has aggregate value");
7387 if (expression->kind == EXPR_REFERENCE) {
7388 reference_expression_t *reference = &expression->reference;
7389 if (reference->entity->kind == ENTITY_FUNCTION &&
7390 reference->entity->function.btk != bk_none)
7391 handle_builtin_argument_restrictions(call);
7398 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7400 static bool same_compound_type(const type_t *type1, const type_t *type2)
7403 is_type_compound(type1) &&
7404 type1->kind == type2->kind &&
7405 type1->compound.compound == type2->compound.compound;
7408 static expression_t const *get_reference_address(expression_t const *expr)
7410 bool regular_take_address = true;
7412 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7413 expr = expr->unary.value;
7415 regular_take_address = false;
7418 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7421 expr = expr->unary.value;
7424 if (expr->kind != EXPR_REFERENCE)
7427 /* special case for functions which are automatically converted to a
7428 * pointer to function without an extra TAKE_ADDRESS operation */
7429 if (!regular_take_address &&
7430 expr->reference.entity->kind != ENTITY_FUNCTION) {
7437 static void warn_reference_address_as_bool(expression_t const* expr)
7439 expr = get_reference_address(expr);
7441 source_position_t const *const pos = &expr->base.source_position;
7442 entity_t const *const ent = expr->reference.entity;
7443 warningf(WARN_ADDRESS, pos, "the address of '%N' will always evaluate as 'true'", ent);
7447 static void warn_assignment_in_condition(const expression_t *const expr)
7449 if (expr->base.kind != EXPR_BINARY_ASSIGN)
7451 if (expr->base.parenthesized)
7453 source_position_t const *const pos = &expr->base.source_position;
7454 warningf(WARN_PARENTHESES, pos, "suggest parentheses around assignment used as truth value");
7457 static void semantic_condition(expression_t const *const expr,
7458 char const *const context)
7460 type_t *const type = skip_typeref(expr->base.type);
7461 if (is_type_scalar(type)) {
7462 warn_reference_address_as_bool(expr);
7463 warn_assignment_in_condition(expr);
7464 } else if (is_type_valid(type)) {
7465 errorf(&expr->base.source_position,
7466 "%s must have scalar type", context);
7471 * Parse a conditional expression, ie. 'expression ? ... : ...'.
7473 * @param expression the conditional expression
7475 static expression_t *parse_conditional_expression(expression_t *expression)
7477 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7479 conditional_expression_t *conditional = &result->conditional;
7480 conditional->condition = expression;
7483 add_anchor_token(':');
7485 /* §6.5.15:2 The first operand shall have scalar type. */
7486 semantic_condition(expression, "condition of conditional operator");
7488 expression_t *true_expression = expression;
7489 bool gnu_cond = false;
7490 if (GNU_MODE && token.type == ':') {
7493 true_expression = parse_expression();
7495 rem_anchor_token(':');
7496 expect(':', end_error);
7498 expression_t *false_expression =
7499 parse_subexpression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
7501 type_t *const orig_true_type = true_expression->base.type;
7502 type_t *const orig_false_type = false_expression->base.type;
7503 type_t *const true_type = skip_typeref(orig_true_type);
7504 type_t *const false_type = skip_typeref(orig_false_type);
7507 source_position_t const *const pos = &conditional->base.source_position;
7508 type_t *result_type;
7509 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7510 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7511 /* ISO/IEC 14882:1998(E) §5.16:2 */
7512 if (true_expression->kind == EXPR_UNARY_THROW) {
7513 result_type = false_type;
7514 } else if (false_expression->kind == EXPR_UNARY_THROW) {
7515 result_type = true_type;
7517 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7518 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7519 warningf(WARN_OTHER, pos, "ISO C forbids conditional expression with only one void side");
7521 result_type = type_void;
7523 } else if (is_type_arithmetic(true_type)
7524 && is_type_arithmetic(false_type)) {
7525 result_type = semantic_arithmetic(true_type, false_type);
7526 } else if (same_compound_type(true_type, false_type)) {
7527 /* just take 1 of the 2 types */
7528 result_type = true_type;
7529 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7530 type_t *pointer_type;
7532 expression_t *other_expression;
7533 if (is_type_pointer(true_type) &&
7534 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7535 pointer_type = true_type;
7536 other_type = false_type;
7537 other_expression = false_expression;
7539 pointer_type = false_type;
7540 other_type = true_type;
7541 other_expression = true_expression;
7544 if (is_null_pointer_constant(other_expression)) {
7545 result_type = pointer_type;
7546 } else if (is_type_pointer(other_type)) {
7547 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7548 type_t *to2 = skip_typeref(other_type->pointer.points_to);
7551 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7552 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7554 } else if (types_compatible(get_unqualified_type(to1),
7555 get_unqualified_type(to2))) {
7558 warningf(WARN_OTHER, pos, "pointer types '%T' and '%T' in conditional expression are incompatible", true_type, false_type);
7562 type_t *const type =
7563 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7564 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7565 } else if (is_type_integer(other_type)) {
7566 warningf(WARN_OTHER, pos, "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7567 result_type = pointer_type;
7569 goto types_incompatible;
7573 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7574 type_error_incompatible("while parsing conditional", pos, true_type, false_type);
7576 result_type = type_error_type;
7579 conditional->true_expression
7580 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7581 conditional->false_expression
7582 = create_implicit_cast(false_expression, result_type);
7583 conditional->base.type = result_type;
7588 * Parse an extension expression.
7590 static expression_t *parse_extension(void)
7592 eat(T___extension__);
7594 bool old_gcc_extension = in_gcc_extension;
7595 in_gcc_extension = true;
7596 expression_t *expression = parse_subexpression(PREC_UNARY);
7597 in_gcc_extension = old_gcc_extension;
7602 * Parse a __builtin_classify_type() expression.
7604 static expression_t *parse_builtin_classify_type(void)
7606 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7607 result->base.type = type_int;
7609 eat(T___builtin_classify_type);
7611 expect('(', end_error);
7612 add_anchor_token(')');
7613 expression_t *expression = parse_expression();
7614 rem_anchor_token(')');
7615 expect(')', end_error);
7616 result->classify_type.type_expression = expression;
7620 return create_invalid_expression();
7624 * Parse a delete expression
7625 * ISO/IEC 14882:1998(E) §5.3.5
7627 static expression_t *parse_delete(void)
7629 expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
7630 result->base.type = type_void;
7635 result->kind = EXPR_UNARY_DELETE_ARRAY;
7636 expect(']', end_error);
7640 expression_t *const value = parse_subexpression(PREC_CAST);
7641 result->unary.value = value;
7643 type_t *const type = skip_typeref(value->base.type);
7644 if (!is_type_pointer(type)) {
7645 if (is_type_valid(type)) {
7646 errorf(&value->base.source_position,
7647 "operand of delete must have pointer type");
7649 } else if (is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
7650 source_position_t const *const pos = &value->base.source_position;
7651 warningf(WARN_OTHER, pos, "deleting 'void*' is undefined");
7658 * Parse a throw expression
7659 * ISO/IEC 14882:1998(E) §15:1
7661 static expression_t *parse_throw(void)
7663 expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
7664 result->base.type = type_void;
7668 expression_t *value = NULL;
7669 switch (token.type) {
7671 value = parse_assignment_expression();
7672 /* ISO/IEC 14882:1998(E) §15.1:3 */
7673 type_t *const orig_type = value->base.type;
7674 type_t *const type = skip_typeref(orig_type);
7675 if (is_type_incomplete(type)) {
7676 errorf(&value->base.source_position,
7677 "cannot throw object of incomplete type '%T'", orig_type);
7678 } else if (is_type_pointer(type)) {
7679 type_t *const points_to = skip_typeref(type->pointer.points_to);
7680 if (is_type_incomplete(points_to) &&
7681 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7682 errorf(&value->base.source_position,
7683 "cannot throw pointer to incomplete type '%T'", orig_type);
7691 result->unary.value = value;
7696 static bool check_pointer_arithmetic(const source_position_t *source_position,
7697 type_t *pointer_type,
7698 type_t *orig_pointer_type)
7700 type_t *points_to = pointer_type->pointer.points_to;
7701 points_to = skip_typeref(points_to);
7703 if (is_type_incomplete(points_to)) {
7704 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7705 errorf(source_position,
7706 "arithmetic with pointer to incomplete type '%T' not allowed",
7710 warningf(WARN_POINTER_ARITH, source_position, "pointer of type '%T' used in arithmetic", orig_pointer_type);
7712 } else if (is_type_function(points_to)) {
7714 errorf(source_position,
7715 "arithmetic with pointer to function type '%T' not allowed",
7719 warningf(WARN_POINTER_ARITH, source_position, "pointer to a function '%T' used in arithmetic", orig_pointer_type);
7725 static bool is_lvalue(const expression_t *expression)
7727 /* TODO: doesn't seem to be consistent with §6.3.2.1:1 */
7728 switch (expression->kind) {
7729 case EXPR_ARRAY_ACCESS:
7730 case EXPR_COMPOUND_LITERAL:
7731 case EXPR_REFERENCE:
7733 case EXPR_UNARY_DEREFERENCE:
7737 type_t *type = skip_typeref(expression->base.type);
7739 /* ISO/IEC 14882:1998(E) §3.10:3 */
7740 is_type_reference(type) ||
7741 /* Claim it is an lvalue, if the type is invalid. There was a parse
7742 * error before, which maybe prevented properly recognizing it as
7744 !is_type_valid(type);
7749 static void semantic_incdec(unary_expression_t *expression)
7751 type_t *const orig_type = expression->value->base.type;
7752 type_t *const type = skip_typeref(orig_type);
7753 if (is_type_pointer(type)) {
7754 if (!check_pointer_arithmetic(&expression->base.source_position,
7758 } else if (!is_type_real(type) && is_type_valid(type)) {
7759 /* TODO: improve error message */
7760 errorf(&expression->base.source_position,
7761 "operation needs an arithmetic or pointer type");
7764 if (!is_lvalue(expression->value)) {
7765 /* TODO: improve error message */
7766 errorf(&expression->base.source_position, "lvalue required as operand");
7768 expression->base.type = orig_type;
7771 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7773 type_t *const orig_type = expression->value->base.type;
7774 type_t *const type = skip_typeref(orig_type);
7775 if (!is_type_arithmetic(type)) {
7776 if (is_type_valid(type)) {
7777 /* TODO: improve error message */
7778 errorf(&expression->base.source_position,
7779 "operation needs an arithmetic type");
7784 expression->base.type = orig_type;
7787 static void semantic_unexpr_plus(unary_expression_t *expression)
7789 semantic_unexpr_arithmetic(expression);
7790 source_position_t const *const pos = &expression->base.source_position;
7791 warningf(WARN_TRADITIONAL, pos, "traditional C rejects the unary plus operator");
7794 static void semantic_not(unary_expression_t *expression)
7796 /* §6.5.3.3:1 The operand [...] of the ! operator, scalar type. */
7797 semantic_condition(expression->value, "operand of !");
7798 expression->base.type = c_mode & _CXX ? type_bool : type_int;
7801 static void semantic_unexpr_integer(unary_expression_t *expression)
7803 type_t *const orig_type = expression->value->base.type;
7804 type_t *const type = skip_typeref(orig_type);
7805 if (!is_type_integer(type)) {
7806 if (is_type_valid(type)) {
7807 errorf(&expression->base.source_position,
7808 "operand of ~ must be of integer type");
7813 expression->base.type = orig_type;
7816 static void semantic_dereference(unary_expression_t *expression)
7818 type_t *const orig_type = expression->value->base.type;
7819 type_t *const type = skip_typeref(orig_type);
7820 if (!is_type_pointer(type)) {
7821 if (is_type_valid(type)) {
7822 errorf(&expression->base.source_position,
7823 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7828 type_t *result_type = type->pointer.points_to;
7829 result_type = automatic_type_conversion(result_type);
7830 expression->base.type = result_type;
7834 * Record that an address is taken (expression represents an lvalue).
7836 * @param expression the expression
7837 * @param may_be_register if true, the expression might be an register
7839 static void set_address_taken(expression_t *expression, bool may_be_register)
7841 if (expression->kind != EXPR_REFERENCE)
7844 entity_t *const entity = expression->reference.entity;
7846 if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
7849 if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
7850 && !may_be_register) {
7851 source_position_t const *const pos = &expression->base.source_position;
7852 errorf(pos, "address of register '%N' requested", entity);
7855 if (entity->kind == ENTITY_VARIABLE) {
7856 entity->variable.address_taken = true;
7858 assert(entity->kind == ENTITY_PARAMETER);
7859 entity->parameter.address_taken = true;
7864 * Check the semantic of the address taken expression.
7866 static void semantic_take_addr(unary_expression_t *expression)
7868 expression_t *value = expression->value;
7869 value->base.type = revert_automatic_type_conversion(value);
7871 type_t *orig_type = value->base.type;
7872 type_t *type = skip_typeref(orig_type);
7873 if (!is_type_valid(type))
7877 if (!is_lvalue(value)) {
7878 errorf(&expression->base.source_position, "'&' requires an lvalue");
7880 if (type->kind == TYPE_BITFIELD) {
7881 errorf(&expression->base.source_position,
7882 "'&' not allowed on object with bitfield type '%T'",
7886 set_address_taken(value, false);
7888 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7891 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
7892 static expression_t *parse_##unexpression_type(void) \
7894 expression_t *unary_expression \
7895 = allocate_expression_zero(unexpression_type); \
7897 unary_expression->unary.value = parse_subexpression(PREC_UNARY); \
7899 sfunc(&unary_expression->unary); \
7901 return unary_expression; \
7904 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7905 semantic_unexpr_arithmetic)
7906 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7907 semantic_unexpr_plus)
7908 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7910 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7911 semantic_dereference)
7912 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7914 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7915 semantic_unexpr_integer)
7916 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
7918 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7921 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7923 static expression_t *parse_##unexpression_type(expression_t *left) \
7925 expression_t *unary_expression \
7926 = allocate_expression_zero(unexpression_type); \
7928 unary_expression->unary.value = left; \
7930 sfunc(&unary_expression->unary); \
7932 return unary_expression; \
7935 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7936 EXPR_UNARY_POSTFIX_INCREMENT,
7938 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7939 EXPR_UNARY_POSTFIX_DECREMENT,
7942 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7944 /* TODO: handle complex + imaginary types */
7946 type_left = get_unqualified_type(type_left);
7947 type_right = get_unqualified_type(type_right);
7949 /* §6.3.1.8 Usual arithmetic conversions */
7950 if (type_left == type_long_double || type_right == type_long_double) {
7951 return type_long_double;
7952 } else if (type_left == type_double || type_right == type_double) {
7954 } else if (type_left == type_float || type_right == type_float) {
7958 type_left = promote_integer(type_left);
7959 type_right = promote_integer(type_right);
7961 if (type_left == type_right)
7964 bool const signed_left = is_type_signed(type_left);
7965 bool const signed_right = is_type_signed(type_right);
7966 int const rank_left = get_rank(type_left);
7967 int const rank_right = get_rank(type_right);
7969 if (signed_left == signed_right)
7970 return rank_left >= rank_right ? type_left : type_right;
7979 u_rank = rank_right;
7980 u_type = type_right;
7982 s_rank = rank_right;
7983 s_type = type_right;
7988 if (u_rank >= s_rank)
7991 /* casting rank to atomic_type_kind is a bit hacky, but makes things
7993 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
7994 > get_atomic_type_size((atomic_type_kind_t) u_rank))
7998 case ATOMIC_TYPE_INT: return type_unsigned_int;
7999 case ATOMIC_TYPE_LONG: return type_unsigned_long;
8000 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8002 default: panic("invalid atomic type");
8007 * Check the semantic restrictions for a binary expression.
8009 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8011 expression_t *const left = expression->left;
8012 expression_t *const right = expression->right;
8013 type_t *const orig_type_left = left->base.type;
8014 type_t *const orig_type_right = right->base.type;
8015 type_t *const type_left = skip_typeref(orig_type_left);
8016 type_t *const type_right = skip_typeref(orig_type_right);
8018 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8019 /* TODO: improve error message */
8020 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8021 errorf(&expression->base.source_position,
8022 "operation needs arithmetic types");
8027 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8028 expression->left = create_implicit_cast(left, arithmetic_type);
8029 expression->right = create_implicit_cast(right, arithmetic_type);
8030 expression->base.type = arithmetic_type;
8033 static void semantic_binexpr_integer(binary_expression_t *const expression)
8035 expression_t *const left = expression->left;
8036 expression_t *const right = expression->right;
8037 type_t *const orig_type_left = left->base.type;
8038 type_t *const orig_type_right = right->base.type;
8039 type_t *const type_left = skip_typeref(orig_type_left);
8040 type_t *const type_right = skip_typeref(orig_type_right);
8042 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8043 /* TODO: improve error message */
8044 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8045 errorf(&expression->base.source_position,
8046 "operation needs integer types");
8051 type_t *const result_type = semantic_arithmetic(type_left, type_right);
8052 expression->left = create_implicit_cast(left, result_type);
8053 expression->right = create_implicit_cast(right, result_type);
8054 expression->base.type = result_type;
8057 static void warn_div_by_zero(binary_expression_t const *const expression)
8059 if (!is_type_integer(expression->base.type))
8062 expression_t const *const right = expression->right;
8063 /* The type of the right operand can be different for /= */
8064 if (is_type_integer(right->base.type) &&
8065 is_constant_expression(right) == EXPR_CLASS_CONSTANT &&
8066 !fold_constant_to_bool(right)) {
8067 source_position_t const *const pos = &expression->base.source_position;
8068 warningf(WARN_DIV_BY_ZERO, pos, "division by zero");
8073 * Check the semantic restrictions for a div/mod expression.
8075 static void semantic_divmod_arithmetic(binary_expression_t *expression)
8077 semantic_binexpr_arithmetic(expression);
8078 warn_div_by_zero(expression);
8081 static void warn_addsub_in_shift(const expression_t *const expr)
8083 if (expr->base.parenthesized)
8087 switch (expr->kind) {
8088 case EXPR_BINARY_ADD: op = '+'; break;
8089 case EXPR_BINARY_SUB: op = '-'; break;
8093 source_position_t const *const pos = &expr->base.source_position;
8094 warningf(WARN_PARENTHESES, pos, "suggest parentheses around '%c' inside shift", op);
8097 static bool semantic_shift(binary_expression_t *expression)
8099 expression_t *const left = expression->left;
8100 expression_t *const right = expression->right;
8101 type_t *const orig_type_left = left->base.type;
8102 type_t *const orig_type_right = right->base.type;
8103 type_t * type_left = skip_typeref(orig_type_left);
8104 type_t * type_right = skip_typeref(orig_type_right);
8106 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8107 /* TODO: improve error message */
8108 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8109 errorf(&expression->base.source_position,
8110 "operands of shift operation must have integer types");
8115 type_left = promote_integer(type_left);
8117 if (is_constant_expression(right) == EXPR_CLASS_CONSTANT) {
8118 source_position_t const *const pos = &right->base.source_position;
8119 long const count = fold_constant_to_int(right);
8121 warningf(WARN_OTHER, pos, "shift count must be non-negative");
8122 } else if ((unsigned long)count >=
8123 get_atomic_type_size(type_left->atomic.akind) * 8) {
8124 warningf(WARN_OTHER, pos, "shift count must be less than type width");
8128 type_right = promote_integer(type_right);
8129 expression->right = create_implicit_cast(right, type_right);
8134 static void semantic_shift_op(binary_expression_t *expression)
8136 expression_t *const left = expression->left;
8137 expression_t *const right = expression->right;
8139 if (!semantic_shift(expression))
8142 warn_addsub_in_shift(left);
8143 warn_addsub_in_shift(right);
8145 type_t *const orig_type_left = left->base.type;
8146 type_t * type_left = skip_typeref(orig_type_left);
8148 type_left = promote_integer(type_left);
8149 expression->left = create_implicit_cast(left, type_left);
8150 expression->base.type = type_left;
8153 static void semantic_add(binary_expression_t *expression)
8155 expression_t *const left = expression->left;
8156 expression_t *const right = expression->right;
8157 type_t *const orig_type_left = left->base.type;
8158 type_t *const orig_type_right = right->base.type;
8159 type_t *const type_left = skip_typeref(orig_type_left);
8160 type_t *const type_right = skip_typeref(orig_type_right);
8163 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8164 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8165 expression->left = create_implicit_cast(left, arithmetic_type);
8166 expression->right = create_implicit_cast(right, arithmetic_type);
8167 expression->base.type = arithmetic_type;
8168 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8169 check_pointer_arithmetic(&expression->base.source_position,
8170 type_left, orig_type_left);
8171 expression->base.type = type_left;
8172 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8173 check_pointer_arithmetic(&expression->base.source_position,
8174 type_right, orig_type_right);
8175 expression->base.type = type_right;
8176 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8177 errorf(&expression->base.source_position,
8178 "invalid operands to binary + ('%T', '%T')",
8179 orig_type_left, orig_type_right);
8183 static void semantic_sub(binary_expression_t *expression)
8185 expression_t *const left = expression->left;
8186 expression_t *const right = expression->right;
8187 type_t *const orig_type_left = left->base.type;
8188 type_t *const orig_type_right = right->base.type;
8189 type_t *const type_left = skip_typeref(orig_type_left);
8190 type_t *const type_right = skip_typeref(orig_type_right);
8191 source_position_t const *const pos = &expression->base.source_position;
8194 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8195 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8196 expression->left = create_implicit_cast(left, arithmetic_type);
8197 expression->right = create_implicit_cast(right, arithmetic_type);
8198 expression->base.type = arithmetic_type;
8199 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8200 check_pointer_arithmetic(&expression->base.source_position,
8201 type_left, orig_type_left);
8202 expression->base.type = type_left;
8203 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8204 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8205 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8206 if (!types_compatible(unqual_left, unqual_right)) {
8208 "subtracting pointers to incompatible types '%T' and '%T'",
8209 orig_type_left, orig_type_right);
8210 } else if (!is_type_object(unqual_left)) {
8211 if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8212 errorf(pos, "subtracting pointers to non-object types '%T'",
8215 warningf(WARN_OTHER, pos, "subtracting pointers to void");
8218 expression->base.type = type_ptrdiff_t;
8219 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8220 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8221 orig_type_left, orig_type_right);
8225 static void warn_string_literal_address(expression_t const* expr)
8227 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8228 expr = expr->unary.value;
8229 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8231 expr = expr->unary.value;
8234 if (expr->kind == EXPR_STRING_LITERAL
8235 || expr->kind == EXPR_WIDE_STRING_LITERAL) {
8236 source_position_t const *const pos = &expr->base.source_position;
8237 warningf(WARN_ADDRESS, pos, "comparison with string literal results in unspecified behaviour");
8241 static bool maybe_negative(expression_t const *const expr)
8243 switch (is_constant_expression(expr)) {
8244 case EXPR_CLASS_ERROR: return false;
8245 case EXPR_CLASS_CONSTANT: return fold_constant_to_int(expr) < 0;
8246 default: return true;
8250 static void warn_comparison(source_position_t const *const pos, expression_t const *const expr, expression_t const *const other)
8252 warn_string_literal_address(expr);
8254 expression_t const* const ref = get_reference_address(expr);
8255 if (ref != NULL && is_null_pointer_constant(other)) {
8256 entity_t const *const ent = ref->reference.entity;
8257 warningf(WARN_ADDRESS, pos, "the address of '%N' will never be NULL", ent);
8260 if (!expr->base.parenthesized) {
8261 switch (expr->base.kind) {
8262 case EXPR_BINARY_LESS:
8263 case EXPR_BINARY_GREATER:
8264 case EXPR_BINARY_LESSEQUAL:
8265 case EXPR_BINARY_GREATEREQUAL:
8266 case EXPR_BINARY_NOTEQUAL:
8267 case EXPR_BINARY_EQUAL:
8268 warningf(WARN_PARENTHESES, pos, "comparisons like 'x <= y < z' do not have their mathematical meaning");
8277 * Check the semantics of comparison expressions.
8279 * @param expression The expression to check.
8281 static void semantic_comparison(binary_expression_t *expression)
8283 source_position_t const *const pos = &expression->base.source_position;
8284 expression_t *const left = expression->left;
8285 expression_t *const right = expression->right;
8287 warn_comparison(pos, left, right);
8288 warn_comparison(pos, right, left);
8290 type_t *orig_type_left = left->base.type;
8291 type_t *orig_type_right = right->base.type;
8292 type_t *type_left = skip_typeref(orig_type_left);
8293 type_t *type_right = skip_typeref(orig_type_right);
8295 /* TODO non-arithmetic types */
8296 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8297 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8299 /* test for signed vs unsigned compares */
8300 if (is_type_integer(arithmetic_type)) {
8301 bool const signed_left = is_type_signed(type_left);
8302 bool const signed_right = is_type_signed(type_right);
8303 if (signed_left != signed_right) {
8304 /* FIXME long long needs better const folding magic */
8305 /* TODO check whether constant value can be represented by other type */
8306 if ((signed_left && maybe_negative(left)) ||
8307 (signed_right && maybe_negative(right))) {
8308 warningf(WARN_SIGN_COMPARE, pos, "comparison between signed and unsigned");
8313 expression->left = create_implicit_cast(left, arithmetic_type);
8314 expression->right = create_implicit_cast(right, arithmetic_type);
8315 expression->base.type = arithmetic_type;
8316 if ((expression->base.kind == EXPR_BINARY_EQUAL ||
8317 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8318 is_type_float(arithmetic_type)) {
8319 warningf(WARN_FLOAT_EQUAL, pos, "comparing floating point with == or != is unsafe");
8321 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8322 /* TODO check compatibility */
8323 } else if (is_type_pointer(type_left)) {
8324 expression->right = create_implicit_cast(right, type_left);
8325 } else if (is_type_pointer(type_right)) {
8326 expression->left = create_implicit_cast(left, type_right);
8327 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8328 type_error_incompatible("invalid operands in comparison", pos, type_left, type_right);
8330 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8334 * Checks if a compound type has constant fields.
8336 static bool has_const_fields(const compound_type_t *type)
8338 compound_t *compound = type->compound;
8339 entity_t *entry = compound->members.entities;
8341 for (; entry != NULL; entry = entry->base.next) {
8342 if (!is_declaration(entry))
8345 const type_t *decl_type = skip_typeref(entry->declaration.type);
8346 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8353 static bool is_valid_assignment_lhs(expression_t const* const left)
8355 type_t *const orig_type_left = revert_automatic_type_conversion(left);
8356 type_t *const type_left = skip_typeref(orig_type_left);
8358 if (!is_lvalue(left)) {
8359 errorf(&left->base.source_position, "left hand side '%E' of assignment is not an lvalue",
8364 if (left->kind == EXPR_REFERENCE
8365 && left->reference.entity->kind == ENTITY_FUNCTION) {
8366 errorf(&left->base.source_position, "cannot assign to function '%E'", left);
8370 if (is_type_array(type_left)) {
8371 errorf(&left->base.source_position, "cannot assign to array '%E'", left);
8374 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8375 errorf(&left->base.source_position, "assignment to read-only location '%E' (type '%T')", left,
8379 if (is_type_incomplete(type_left)) {
8380 errorf(&left->base.source_position, "left-hand side '%E' of assignment has incomplete type '%T'",
8381 left, orig_type_left);
8384 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
8385 errorf(&left->base.source_position, "cannot assign to '%E' because compound type '%T' has read-only fields",
8386 left, orig_type_left);
8393 static void semantic_arithmetic_assign(binary_expression_t *expression)
8395 expression_t *left = expression->left;
8396 expression_t *right = expression->right;
8397 type_t *orig_type_left = left->base.type;
8398 type_t *orig_type_right = right->base.type;
8400 if (!is_valid_assignment_lhs(left))
8403 type_t *type_left = skip_typeref(orig_type_left);
8404 type_t *type_right = skip_typeref(orig_type_right);
8406 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8407 /* TODO: improve error message */
8408 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8409 errorf(&expression->base.source_position,
8410 "operation needs arithmetic types");
8415 /* combined instructions are tricky. We can't create an implicit cast on
8416 * the left side, because we need the uncasted form for the store.
8417 * The ast2firm pass has to know that left_type must be right_type
8418 * for the arithmetic operation and create a cast by itself */
8419 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8420 expression->right = create_implicit_cast(right, arithmetic_type);
8421 expression->base.type = type_left;
8424 static void semantic_divmod_assign(binary_expression_t *expression)
8426 semantic_arithmetic_assign(expression);
8427 warn_div_by_zero(expression);
8430 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
8432 expression_t *const left = expression->left;
8433 expression_t *const right = expression->right;
8434 type_t *const orig_type_left = left->base.type;
8435 type_t *const orig_type_right = right->base.type;
8436 type_t *const type_left = skip_typeref(orig_type_left);
8437 type_t *const type_right = skip_typeref(orig_type_right);
8439 if (!is_valid_assignment_lhs(left))
8442 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8443 /* combined instructions are tricky. We can't create an implicit cast on
8444 * the left side, because we need the uncasted form for the store.
8445 * The ast2firm pass has to know that left_type must be right_type
8446 * for the arithmetic operation and create a cast by itself */
8447 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8448 expression->right = create_implicit_cast(right, arithmetic_type);
8449 expression->base.type = type_left;
8450 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8451 check_pointer_arithmetic(&expression->base.source_position,
8452 type_left, orig_type_left);
8453 expression->base.type = type_left;
8454 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8455 errorf(&expression->base.source_position,
8456 "incompatible types '%T' and '%T' in assignment",
8457 orig_type_left, orig_type_right);
8461 static void semantic_integer_assign(binary_expression_t *expression)
8463 expression_t *left = expression->left;
8464 expression_t *right = expression->right;
8465 type_t *orig_type_left = left->base.type;
8466 type_t *orig_type_right = right->base.type;
8468 if (!is_valid_assignment_lhs(left))
8471 type_t *type_left = skip_typeref(orig_type_left);
8472 type_t *type_right = skip_typeref(orig_type_right);
8474 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8475 /* TODO: improve error message */
8476 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8477 errorf(&expression->base.source_position,
8478 "operation needs integer types");
8483 /* combined instructions are tricky. We can't create an implicit cast on
8484 * the left side, because we need the uncasted form for the store.
8485 * The ast2firm pass has to know that left_type must be right_type
8486 * for the arithmetic operation and create a cast by itself */
8487 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8488 expression->right = create_implicit_cast(right, arithmetic_type);
8489 expression->base.type = type_left;
8492 static void semantic_shift_assign(binary_expression_t *expression)
8494 expression_t *left = expression->left;
8496 if (!is_valid_assignment_lhs(left))
8499 if (!semantic_shift(expression))
8502 expression->base.type = skip_typeref(left->base.type);
8505 static void warn_logical_and_within_or(const expression_t *const expr)
8507 if (expr->base.kind != EXPR_BINARY_LOGICAL_AND)
8509 if (expr->base.parenthesized)
8511 source_position_t const *const pos = &expr->base.source_position;
8512 warningf(WARN_PARENTHESES, pos, "suggest parentheses around && within ||");
8516 * Check the semantic restrictions of a logical expression.
8518 static void semantic_logical_op(binary_expression_t *expression)
8520 /* §6.5.13:2 Each of the operands shall have scalar type.
8521 * §6.5.14:2 Each of the operands shall have scalar type. */
8522 semantic_condition(expression->left, "left operand of logical operator");
8523 semantic_condition(expression->right, "right operand of logical operator");
8524 if (expression->base.kind == EXPR_BINARY_LOGICAL_OR) {
8525 warn_logical_and_within_or(expression->left);
8526 warn_logical_and_within_or(expression->right);
8528 expression->base.type = c_mode & _CXX ? type_bool : type_int;
8532 * Check the semantic restrictions of a binary assign expression.
8534 static void semantic_binexpr_assign(binary_expression_t *expression)
8536 expression_t *left = expression->left;
8537 type_t *orig_type_left = left->base.type;
8539 if (!is_valid_assignment_lhs(left))
8542 assign_error_t error = semantic_assign(orig_type_left, expression->right);
8543 report_assign_error(error, orig_type_left, expression->right,
8544 "assignment", &left->base.source_position);
8545 expression->right = create_implicit_cast(expression->right, orig_type_left);
8546 expression->base.type = orig_type_left;
8550 * Determine if the outermost operation (or parts thereof) of the given
8551 * expression has no effect in order to generate a warning about this fact.
8552 * Therefore in some cases this only examines some of the operands of the
8553 * expression (see comments in the function and examples below).
8555 * f() + 23; // warning, because + has no effect
8556 * x || f(); // no warning, because x controls execution of f()
8557 * x ? y : f(); // warning, because y has no effect
8558 * (void)x; // no warning to be able to suppress the warning
8559 * This function can NOT be used for an "expression has definitely no effect"-
8561 static bool expression_has_effect(const expression_t *const expr)
8563 switch (expr->kind) {
8564 case EXPR_UNKNOWN: break;
8565 case EXPR_INVALID: return true; /* do NOT warn */
8566 case EXPR_REFERENCE: return false;
8567 case EXPR_REFERENCE_ENUM_VALUE: return false;
8568 case EXPR_LABEL_ADDRESS: return false;
8570 /* suppress the warning for microsoft __noop operations */
8571 case EXPR_LITERAL_MS_NOOP: return true;
8572 case EXPR_LITERAL_BOOLEAN:
8573 case EXPR_LITERAL_CHARACTER:
8574 case EXPR_LITERAL_WIDE_CHARACTER:
8575 case EXPR_LITERAL_INTEGER:
8576 case EXPR_LITERAL_INTEGER_OCTAL:
8577 case EXPR_LITERAL_INTEGER_HEXADECIMAL:
8578 case EXPR_LITERAL_FLOATINGPOINT:
8579 case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: return false;
8580 case EXPR_STRING_LITERAL: return false;
8581 case EXPR_WIDE_STRING_LITERAL: return false;
8584 const call_expression_t *const call = &expr->call;
8585 if (call->function->kind != EXPR_REFERENCE)
8588 switch (call->function->reference.entity->function.btk) {
8589 /* FIXME: which builtins have no effect? */
8590 default: return true;
8594 /* Generate the warning if either the left or right hand side of a
8595 * conditional expression has no effect */
8596 case EXPR_CONDITIONAL: {
8597 conditional_expression_t const *const cond = &expr->conditional;
8598 expression_t const *const t = cond->true_expression;
8600 (t == NULL || expression_has_effect(t)) &&
8601 expression_has_effect(cond->false_expression);
8604 case EXPR_SELECT: return false;
8605 case EXPR_ARRAY_ACCESS: return false;
8606 case EXPR_SIZEOF: return false;
8607 case EXPR_CLASSIFY_TYPE: return false;
8608 case EXPR_ALIGNOF: return false;
8610 case EXPR_FUNCNAME: return false;
8611 case EXPR_BUILTIN_CONSTANT_P: return false;
8612 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return false;
8613 case EXPR_OFFSETOF: return false;
8614 case EXPR_VA_START: return true;
8615 case EXPR_VA_ARG: return true;
8616 case EXPR_VA_COPY: return true;
8617 case EXPR_STATEMENT: return true; // TODO
8618 case EXPR_COMPOUND_LITERAL: return false;
8620 case EXPR_UNARY_NEGATE: return false;
8621 case EXPR_UNARY_PLUS: return false;
8622 case EXPR_UNARY_BITWISE_NEGATE: return false;
8623 case EXPR_UNARY_NOT: return false;
8624 case EXPR_UNARY_DEREFERENCE: return false;
8625 case EXPR_UNARY_TAKE_ADDRESS: return false;
8626 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
8627 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
8628 case EXPR_UNARY_PREFIX_INCREMENT: return true;
8629 case EXPR_UNARY_PREFIX_DECREMENT: return true;
8631 /* Treat void casts as if they have an effect in order to being able to
8632 * suppress the warning */
8633 case EXPR_UNARY_CAST: {
8634 type_t *const type = skip_typeref(expr->base.type);
8635 return is_type_atomic(type, ATOMIC_TYPE_VOID);
8638 case EXPR_UNARY_CAST_IMPLICIT: return true;
8639 case EXPR_UNARY_ASSUME: return true;
8640 case EXPR_UNARY_DELETE: return true;
8641 case EXPR_UNARY_DELETE_ARRAY: return true;
8642 case EXPR_UNARY_THROW: return true;
8644 case EXPR_BINARY_ADD: return false;
8645 case EXPR_BINARY_SUB: return false;
8646 case EXPR_BINARY_MUL: return false;
8647 case EXPR_BINARY_DIV: return false;
8648 case EXPR_BINARY_MOD: return false;
8649 case EXPR_BINARY_EQUAL: return false;
8650 case EXPR_BINARY_NOTEQUAL: return false;
8651 case EXPR_BINARY_LESS: return false;
8652 case EXPR_BINARY_LESSEQUAL: return false;
8653 case EXPR_BINARY_GREATER: return false;
8654 case EXPR_BINARY_GREATEREQUAL: return false;
8655 case EXPR_BINARY_BITWISE_AND: return false;
8656 case EXPR_BINARY_BITWISE_OR: return false;
8657 case EXPR_BINARY_BITWISE_XOR: return false;
8658 case EXPR_BINARY_SHIFTLEFT: return false;
8659 case EXPR_BINARY_SHIFTRIGHT: return false;
8660 case EXPR_BINARY_ASSIGN: return true;
8661 case EXPR_BINARY_MUL_ASSIGN: return true;
8662 case EXPR_BINARY_DIV_ASSIGN: return true;
8663 case EXPR_BINARY_MOD_ASSIGN: return true;
8664 case EXPR_BINARY_ADD_ASSIGN: return true;
8665 case EXPR_BINARY_SUB_ASSIGN: return true;
8666 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
8667 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
8668 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8669 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8670 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
8672 /* Only examine the right hand side of && and ||, because the left hand
8673 * side already has the effect of controlling the execution of the right
8675 case EXPR_BINARY_LOGICAL_AND:
8676 case EXPR_BINARY_LOGICAL_OR:
8677 /* Only examine the right hand side of a comma expression, because the left
8678 * hand side has a separate warning */
8679 case EXPR_BINARY_COMMA:
8680 return expression_has_effect(expr->binary.right);
8682 case EXPR_BINARY_ISGREATER: return false;
8683 case EXPR_BINARY_ISGREATEREQUAL: return false;
8684 case EXPR_BINARY_ISLESS: return false;
8685 case EXPR_BINARY_ISLESSEQUAL: return false;
8686 case EXPR_BINARY_ISLESSGREATER: return false;
8687 case EXPR_BINARY_ISUNORDERED: return false;
8690 internal_errorf(HERE, "unexpected expression");
8693 static void semantic_comma(binary_expression_t *expression)
8695 const expression_t *const left = expression->left;
8696 if (!expression_has_effect(left)) {
8697 source_position_t const *const pos = &left->base.source_position;
8698 warningf(WARN_UNUSED_VALUE, pos, "left-hand operand of comma expression has no effect");
8700 expression->base.type = expression->right->base.type;
8704 * @param prec_r precedence of the right operand
8706 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
8707 static expression_t *parse_##binexpression_type(expression_t *left) \
8709 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8710 binexpr->binary.left = left; \
8713 expression_t *right = parse_subexpression(prec_r); \
8715 binexpr->binary.right = right; \
8716 sfunc(&binexpr->binary); \
8721 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic)
8722 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic)
8723 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic)
8724 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add)
8725 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub)
8726 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op)
8727 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op)
8728 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison)
8729 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison)
8730 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison)
8731 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison)
8732 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison)
8733 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison)
8734 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_integer)
8735 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_integer)
8736 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_integer)
8737 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op)
8738 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op)
8739 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign)
8740 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
8741 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign)
8742 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign)
8743 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
8744 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign)
8745 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_shift_assign)
8746 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_shift_assign)
8747 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_integer_assign)
8748 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_integer_assign)
8749 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_integer_assign)
8750 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma)
8753 static expression_t *parse_subexpression(precedence_t precedence)
8755 if (token.type < 0) {
8756 return expected_expression_error();
8759 expression_parser_function_t *parser
8760 = &expression_parsers[token.type];
8763 if (parser->parser != NULL) {
8764 left = parser->parser();
8766 left = parse_primary_expression();
8768 assert(left != NULL);
8771 if (token.type < 0) {
8772 return expected_expression_error();
8775 parser = &expression_parsers[token.type];
8776 if (parser->infix_parser == NULL)
8778 if (parser->infix_precedence < precedence)
8781 left = parser->infix_parser(left);
8783 assert(left != NULL);
8784 assert(left->kind != EXPR_UNKNOWN);
8791 * Parse an expression.
8793 static expression_t *parse_expression(void)
8795 return parse_subexpression(PREC_EXPRESSION);
8799 * Register a parser for a prefix-like operator.
8801 * @param parser the parser function
8802 * @param token_type the token type of the prefix token
8804 static void register_expression_parser(parse_expression_function parser,
8807 expression_parser_function_t *entry = &expression_parsers[token_type];
8809 if (entry->parser != NULL) {
8810 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8811 panic("trying to register multiple expression parsers for a token");
8813 entry->parser = parser;
8817 * Register a parser for an infix operator with given precedence.
8819 * @param parser the parser function
8820 * @param token_type the token type of the infix operator
8821 * @param precedence the precedence of the operator
8823 static void register_infix_parser(parse_expression_infix_function parser,
8824 int token_type, precedence_t precedence)
8826 expression_parser_function_t *entry = &expression_parsers[token_type];
8828 if (entry->infix_parser != NULL) {
8829 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8830 panic("trying to register multiple infix expression parsers for a "
8833 entry->infix_parser = parser;
8834 entry->infix_precedence = precedence;
8838 * Initialize the expression parsers.
8840 static void init_expression_parsers(void)
8842 memset(&expression_parsers, 0, sizeof(expression_parsers));
8844 register_infix_parser(parse_array_expression, '[', PREC_POSTFIX);
8845 register_infix_parser(parse_call_expression, '(', PREC_POSTFIX);
8846 register_infix_parser(parse_select_expression, '.', PREC_POSTFIX);
8847 register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX);
8848 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX);
8849 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX);
8850 register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE);
8851 register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE);
8852 register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE);
8853 register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE);
8854 register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE);
8855 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT);
8856 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT);
8857 register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL);
8858 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL);
8859 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL);
8860 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL);
8861 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY);
8862 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
8863 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND);
8864 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR);
8865 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR);
8866 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND);
8867 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR);
8868 register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL);
8869 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT);
8870 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT);
8871 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT);
8872 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT);
8873 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT);
8874 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT);
8875 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT);
8876 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT);
8877 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT);
8878 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT);
8879 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT);
8880 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION);
8882 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-');
8883 register_expression_parser(parse_EXPR_UNARY_PLUS, '+');
8884 register_expression_parser(parse_EXPR_UNARY_NOT, '!');
8885 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~');
8886 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*');
8887 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&');
8888 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
8889 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
8890 register_expression_parser(parse_sizeof, T_sizeof);
8891 register_expression_parser(parse_alignof, T___alignof__);
8892 register_expression_parser(parse_extension, T___extension__);
8893 register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type);
8894 register_expression_parser(parse_delete, T_delete);
8895 register_expression_parser(parse_throw, T_throw);
8899 * Parse a asm statement arguments specification.
8901 static asm_argument_t *parse_asm_arguments(bool is_out)
8903 asm_argument_t *result = NULL;
8904 asm_argument_t **anchor = &result;
8906 while (token.type == T_STRING_LITERAL || token.type == '[') {
8907 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8908 memset(argument, 0, sizeof(argument[0]));
8911 if (token.type != T_IDENTIFIER) {
8912 parse_error_expected("while parsing asm argument",
8913 T_IDENTIFIER, NULL);
8916 argument->symbol = token.symbol;
8918 expect(']', end_error);
8921 argument->constraints = parse_string_literals();
8922 expect('(', end_error);
8923 add_anchor_token(')');
8924 expression_t *expression = parse_expression();
8925 rem_anchor_token(')');
8927 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
8928 * change size or type representation (e.g. int -> long is ok, but
8929 * int -> float is not) */
8930 if (expression->kind == EXPR_UNARY_CAST) {
8931 type_t *const type = expression->base.type;
8932 type_kind_t const kind = type->kind;
8933 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8936 if (kind == TYPE_ATOMIC) {
8937 atomic_type_kind_t const akind = type->atomic.akind;
8938 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8939 size = get_atomic_type_size(akind);
8941 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8942 size = get_atomic_type_size(get_intptr_kind());
8946 expression_t *const value = expression->unary.value;
8947 type_t *const value_type = value->base.type;
8948 type_kind_t const value_kind = value_type->kind;
8950 unsigned value_flags;
8951 unsigned value_size;
8952 if (value_kind == TYPE_ATOMIC) {
8953 atomic_type_kind_t const value_akind = value_type->atomic.akind;
8954 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8955 value_size = get_atomic_type_size(value_akind);
8956 } else if (value_kind == TYPE_POINTER) {
8957 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8958 value_size = get_atomic_type_size(get_intptr_kind());
8963 if (value_flags != flags || value_size != size)
8967 } while (expression->kind == EXPR_UNARY_CAST);
8971 if (!is_lvalue(expression)) {
8972 errorf(&expression->base.source_position,
8973 "asm output argument is not an lvalue");
8976 if (argument->constraints.begin[0] == '=')
8977 determine_lhs_ent(expression, NULL);
8979 mark_vars_read(expression, NULL);
8981 mark_vars_read(expression, NULL);
8983 argument->expression = expression;
8984 expect(')', end_error);
8986 set_address_taken(expression, true);
8989 anchor = &argument->next;
9001 * Parse a asm statement clobber specification.
9003 static asm_clobber_t *parse_asm_clobbers(void)
9005 asm_clobber_t *result = NULL;
9006 asm_clobber_t **anchor = &result;
9008 while (token.type == T_STRING_LITERAL) {
9009 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9010 clobber->clobber = parse_string_literals();
9013 anchor = &clobber->next;
9023 * Parse an asm statement.
9025 static statement_t *parse_asm_statement(void)
9027 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9028 asm_statement_t *asm_statement = &statement->asms;
9032 if (next_if(T_volatile))
9033 asm_statement->is_volatile = true;
9035 expect('(', end_error);
9036 add_anchor_token(')');
9037 if (token.type != T_STRING_LITERAL) {
9038 parse_error_expected("after asm(", T_STRING_LITERAL, NULL);
9041 asm_statement->asm_text = parse_string_literals();
9043 add_anchor_token(':');
9044 if (!next_if(':')) {
9045 rem_anchor_token(':');
9049 asm_statement->outputs = parse_asm_arguments(true);
9050 if (!next_if(':')) {
9051 rem_anchor_token(':');
9055 asm_statement->inputs = parse_asm_arguments(false);
9056 if (!next_if(':')) {
9057 rem_anchor_token(':');
9060 rem_anchor_token(':');
9062 asm_statement->clobbers = parse_asm_clobbers();
9065 rem_anchor_token(')');
9066 expect(')', end_error);
9067 expect(';', end_error);
9069 if (asm_statement->outputs == NULL) {
9070 /* GCC: An 'asm' instruction without any output operands will be treated
9071 * identically to a volatile 'asm' instruction. */
9072 asm_statement->is_volatile = true;
9077 return create_invalid_statement();
9080 static statement_t *parse_label_inner_statement(statement_t const *const label, char const *const label_kind)
9082 statement_t *inner_stmt;
9083 switch (token.type) {
9085 errorf(&label->base.source_position, "%s at end of compound statement", label_kind);
9086 inner_stmt = create_invalid_statement();
9090 if (label->kind == STATEMENT_LABEL) {
9091 /* Eat an empty statement here, to avoid the warning about an empty
9092 * statement after a label. label:; is commonly used to have a label
9093 * before a closing brace. */
9094 inner_stmt = create_empty_statement();
9101 inner_stmt = parse_statement();
9102 /* ISO/IEC 14882:1998(E) §6:1/§6.7 Declarations are statements */
9103 if (inner_stmt->kind == STATEMENT_DECLARATION && !(c_mode & _CXX)) {
9104 errorf(&inner_stmt->base.source_position, "declaration after %s", label_kind);
9112 * Parse a case statement.
9114 static statement_t *parse_case_statement(void)
9116 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9117 source_position_t *const pos = &statement->base.source_position;
9121 expression_t *const expression = parse_expression();
9122 statement->case_label.expression = expression;
9123 expression_classification_t const expr_class = is_constant_expression(expression);
9124 if (expr_class != EXPR_CLASS_CONSTANT) {
9125 if (expr_class != EXPR_CLASS_ERROR) {
9126 errorf(pos, "case label does not reduce to an integer constant");
9128 statement->case_label.is_bad = true;
9130 long const val = fold_constant_to_int(expression);
9131 statement->case_label.first_case = val;
9132 statement->case_label.last_case = val;
9136 if (next_if(T_DOTDOTDOT)) {
9137 expression_t *const end_range = parse_expression();
9138 statement->case_label.end_range = end_range;
9139 expression_classification_t const end_class = is_constant_expression(end_range);
9140 if (end_class != EXPR_CLASS_CONSTANT) {
9141 if (end_class != EXPR_CLASS_ERROR) {
9142 errorf(pos, "case range does not reduce to an integer constant");
9144 statement->case_label.is_bad = true;
9146 long const val = fold_constant_to_int(end_range);
9147 statement->case_label.last_case = val;
9149 if (val < statement->case_label.first_case) {
9150 statement->case_label.is_empty_range = true;
9151 warningf(WARN_OTHER, pos, "empty range specified");
9157 PUSH_PARENT(statement);
9159 expect(':', end_error);
9162 if (current_switch != NULL) {
9163 if (! statement->case_label.is_bad) {
9164 /* Check for duplicate case values */
9165 case_label_statement_t *c = &statement->case_label;
9166 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9167 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9170 if (c->last_case < l->first_case || c->first_case > l->last_case)
9173 errorf(pos, "duplicate case value (previously used %P)",
9174 &l->base.source_position);
9178 /* link all cases into the switch statement */
9179 if (current_switch->last_case == NULL) {
9180 current_switch->first_case = &statement->case_label;
9182 current_switch->last_case->next = &statement->case_label;
9184 current_switch->last_case = &statement->case_label;
9186 errorf(pos, "case label not within a switch statement");
9189 statement->case_label.statement = parse_label_inner_statement(statement, "case label");
9196 * Parse a default statement.
9198 static statement_t *parse_default_statement(void)
9200 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9204 PUSH_PARENT(statement);
9206 expect(':', end_error);
9209 if (current_switch != NULL) {
9210 const case_label_statement_t *def_label = current_switch->default_label;
9211 if (def_label != NULL) {
9212 errorf(&statement->base.source_position, "multiple default labels in one switch (previous declared %P)", &def_label->base.source_position);
9214 current_switch->default_label = &statement->case_label;
9216 /* link all cases into the switch statement */
9217 if (current_switch->last_case == NULL) {
9218 current_switch->first_case = &statement->case_label;
9220 current_switch->last_case->next = &statement->case_label;
9222 current_switch->last_case = &statement->case_label;
9225 errorf(&statement->base.source_position,
9226 "'default' label not within a switch statement");
9229 statement->case_label.statement = parse_label_inner_statement(statement, "default label");
9236 * Parse a label statement.
9238 static statement_t *parse_label_statement(void)
9240 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9241 label_t *const label = get_label();
9242 statement->label.label = label;
9244 PUSH_PARENT(statement);
9246 /* if statement is already set then the label is defined twice,
9247 * otherwise it was just mentioned in a goto/local label declaration so far
9249 source_position_t const* const pos = &statement->base.source_position;
9250 if (label->statement != NULL) {
9251 errorf(pos, "duplicate '%N' (declared %P)", (entity_t const*)label, &label->base.source_position);
9253 label->base.source_position = *pos;
9254 label->statement = statement;
9259 statement->label.statement = parse_label_inner_statement(statement, "label");
9261 /* remember the labels in a list for later checking */
9262 *label_anchor = &statement->label;
9263 label_anchor = &statement->label.next;
9270 * Parse an if statement.
9272 static statement_t *parse_if(void)
9274 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9278 PUSH_PARENT(statement);
9280 add_anchor_token('{');
9282 expect('(', end_error);
9283 add_anchor_token(')');
9284 expression_t *const expr = parse_expression();
9285 statement->ifs.condition = expr;
9286 /* §6.8.4.1:1 The controlling expression of an if statement shall have
9288 semantic_condition(expr, "condition of 'if'-statment");
9289 mark_vars_read(expr, NULL);
9290 rem_anchor_token(')');
9291 expect(')', end_error);
9294 rem_anchor_token('{');
9296 add_anchor_token(T_else);
9297 statement_t *const true_stmt = parse_statement();
9298 statement->ifs.true_statement = true_stmt;
9299 rem_anchor_token(T_else);
9301 if (next_if(T_else)) {
9302 statement->ifs.false_statement = parse_statement();
9303 } else if (true_stmt->kind == STATEMENT_IF &&
9304 true_stmt->ifs.false_statement != NULL) {
9305 source_position_t const *const pos = &true_stmt->base.source_position;
9306 warningf(WARN_PARENTHESES, pos, "suggest explicit braces to avoid ambiguous 'else'");
9314 * Check that all enums are handled in a switch.
9316 * @param statement the switch statement to check
9318 static void check_enum_cases(const switch_statement_t *statement)
9320 if (!is_warn_on(WARN_SWITCH_ENUM))
9322 const type_t *type = skip_typeref(statement->expression->base.type);
9323 if (! is_type_enum(type))
9325 const enum_type_t *enumt = &type->enumt;
9327 /* if we have a default, no warnings */
9328 if (statement->default_label != NULL)
9331 /* FIXME: calculation of value should be done while parsing */
9332 /* TODO: quadratic algorithm here. Change to an n log n one */
9333 long last_value = -1;
9334 const entity_t *entry = enumt->enume->base.next;
9335 for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9336 entry = entry->base.next) {
9337 const expression_t *expression = entry->enum_value.value;
9338 long value = expression != NULL ? fold_constant_to_int(expression) : last_value + 1;
9340 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9341 if (l->expression == NULL)
9343 if (l->first_case <= value && value <= l->last_case) {
9349 source_position_t const *const pos = &statement->base.source_position;
9350 warningf(WARN_SWITCH_ENUM, pos, "'%N' not handled in switch", entry);
9357 * Parse a switch statement.
9359 static statement_t *parse_switch(void)
9361 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9365 PUSH_PARENT(statement);
9367 expect('(', end_error);
9368 add_anchor_token(')');
9369 expression_t *const expr = parse_expression();
9370 mark_vars_read(expr, NULL);
9371 type_t * type = skip_typeref(expr->base.type);
9372 if (is_type_integer(type)) {
9373 type = promote_integer(type);
9374 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9375 warningf(WARN_TRADITIONAL, &expr->base.source_position, "'%T' switch expression not converted to '%T' in ISO C", type, type_int);
9377 } else if (is_type_valid(type)) {
9378 errorf(&expr->base.source_position,
9379 "switch quantity is not an integer, but '%T'", type);
9380 type = type_error_type;
9382 statement->switchs.expression = create_implicit_cast(expr, type);
9383 expect(')', end_error);
9384 rem_anchor_token(')');
9386 switch_statement_t *rem = current_switch;
9387 current_switch = &statement->switchs;
9388 statement->switchs.body = parse_statement();
9389 current_switch = rem;
9391 if (statement->switchs.default_label == NULL) {
9392 warningf(WARN_SWITCH_DEFAULT, &statement->base.source_position, "switch has no default case");
9394 check_enum_cases(&statement->switchs);
9400 return create_invalid_statement();
9403 static statement_t *parse_loop_body(statement_t *const loop)
9405 statement_t *const rem = current_loop;
9406 current_loop = loop;
9408 statement_t *const body = parse_statement();
9415 * Parse a while statement.
9417 static statement_t *parse_while(void)
9419 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9423 PUSH_PARENT(statement);
9425 expect('(', end_error);
9426 add_anchor_token(')');
9427 expression_t *const cond = parse_expression();
9428 statement->whiles.condition = cond;
9429 /* §6.8.5:2 The controlling expression of an iteration statement shall
9430 * have scalar type. */
9431 semantic_condition(cond, "condition of 'while'-statement");
9432 mark_vars_read(cond, NULL);
9433 rem_anchor_token(')');
9434 expect(')', end_error);
9436 statement->whiles.body = parse_loop_body(statement);
9442 return create_invalid_statement();
9446 * Parse a do statement.
9448 static statement_t *parse_do(void)
9450 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9454 PUSH_PARENT(statement);
9456 add_anchor_token(T_while);
9457 statement->do_while.body = parse_loop_body(statement);
9458 rem_anchor_token(T_while);
9460 expect(T_while, end_error);
9461 expect('(', end_error);
9462 add_anchor_token(')');
9463 expression_t *const cond = parse_expression();
9464 statement->do_while.condition = cond;
9465 /* §6.8.5:2 The controlling expression of an iteration statement shall
9466 * have scalar type. */
9467 semantic_condition(cond, "condition of 'do-while'-statement");
9468 mark_vars_read(cond, NULL);
9469 rem_anchor_token(')');
9470 expect(')', end_error);
9471 expect(';', end_error);
9477 return create_invalid_statement();
9481 * Parse a for statement.
9483 static statement_t *parse_for(void)
9485 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9489 expect('(', end_error1);
9490 add_anchor_token(')');
9492 PUSH_PARENT(statement);
9494 size_t const top = environment_top();
9495 scope_t *old_scope = scope_push(&statement->fors.scope);
9497 bool old_gcc_extension = in_gcc_extension;
9498 while (next_if(T___extension__)) {
9499 in_gcc_extension = true;
9503 } else if (is_declaration_specifier(&token)) {
9504 parse_declaration(record_entity, DECL_FLAGS_NONE);
9506 add_anchor_token(';');
9507 expression_t *const init = parse_expression();
9508 statement->fors.initialisation = init;
9509 mark_vars_read(init, ENT_ANY);
9510 if (!expression_has_effect(init)) {
9511 warningf(WARN_UNUSED_VALUE, &init->base.source_position, "initialisation of 'for'-statement has no effect");
9513 rem_anchor_token(';');
9514 expect(';', end_error2);
9516 in_gcc_extension = old_gcc_extension;
9518 if (token.type != ';') {
9519 add_anchor_token(';');
9520 expression_t *const cond = parse_expression();
9521 statement->fors.condition = cond;
9522 /* §6.8.5:2 The controlling expression of an iteration statement
9523 * shall have scalar type. */
9524 semantic_condition(cond, "condition of 'for'-statement");
9525 mark_vars_read(cond, NULL);
9526 rem_anchor_token(';');
9528 expect(';', end_error2);
9529 if (token.type != ')') {
9530 expression_t *const step = parse_expression();
9531 statement->fors.step = step;
9532 mark_vars_read(step, ENT_ANY);
9533 if (!expression_has_effect(step)) {
9534 warningf(WARN_UNUSED_VALUE, &step->base.source_position, "step of 'for'-statement has no effect");
9537 expect(')', end_error2);
9538 rem_anchor_token(')');
9539 statement->fors.body = parse_loop_body(statement);
9541 assert(current_scope == &statement->fors.scope);
9542 scope_pop(old_scope);
9543 environment_pop_to(top);
9550 rem_anchor_token(')');
9551 assert(current_scope == &statement->fors.scope);
9552 scope_pop(old_scope);
9553 environment_pop_to(top);
9557 return create_invalid_statement();
9561 * Parse a goto statement.
9563 static statement_t *parse_goto(void)
9565 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
9568 if (GNU_MODE && next_if('*')) {
9569 expression_t *expression = parse_expression();
9570 mark_vars_read(expression, NULL);
9572 /* Argh: although documentation says the expression must be of type void*,
9573 * gcc accepts anything that can be casted into void* without error */
9574 type_t *type = expression->base.type;
9576 if (type != type_error_type) {
9577 if (!is_type_pointer(type) && !is_type_integer(type)) {
9578 errorf(&expression->base.source_position,
9579 "cannot convert to a pointer type");
9580 } else if (type != type_void_ptr) {
9581 warningf(WARN_OTHER, &expression->base.source_position, "type of computed goto expression should be 'void*' not '%T'", type);
9583 expression = create_implicit_cast(expression, type_void_ptr);
9586 statement->gotos.expression = expression;
9587 } else if (token.type == T_IDENTIFIER) {
9588 label_t *const label = get_label();
9590 statement->gotos.label = label;
9593 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9595 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9597 return create_invalid_statement();
9600 /* remember the goto's in a list for later checking */
9601 *goto_anchor = &statement->gotos;
9602 goto_anchor = &statement->gotos.next;
9604 expect(';', end_error);
9611 * Parse a continue statement.
9613 static statement_t *parse_continue(void)
9615 if (current_loop == NULL) {
9616 errorf(HERE, "continue statement not within loop");
9619 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9622 expect(';', end_error);
9629 * Parse a break statement.
9631 static statement_t *parse_break(void)
9633 if (current_switch == NULL && current_loop == NULL) {
9634 errorf(HERE, "break statement not within loop or switch");
9637 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9640 expect(';', end_error);
9647 * Parse a __leave statement.
9649 static statement_t *parse_leave_statement(void)
9651 if (current_try == NULL) {
9652 errorf(HERE, "__leave statement not within __try");
9655 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9658 expect(';', end_error);
9665 * Check if a given entity represents a local variable.
9667 static bool is_local_variable(const entity_t *entity)
9669 if (entity->kind != ENTITY_VARIABLE)
9672 switch ((storage_class_tag_t) entity->declaration.storage_class) {
9673 case STORAGE_CLASS_AUTO:
9674 case STORAGE_CLASS_REGISTER: {
9675 const type_t *type = skip_typeref(entity->declaration.type);
9676 if (is_type_function(type)) {
9688 * Check if a given expression represents a local variable.
9690 static bool expression_is_local_variable(const expression_t *expression)
9692 if (expression->base.kind != EXPR_REFERENCE) {
9695 const entity_t *entity = expression->reference.entity;
9696 return is_local_variable(entity);
9700 * Check if a given expression represents a local variable and
9701 * return its declaration then, else return NULL.
9703 entity_t *expression_is_variable(const expression_t *expression)
9705 if (expression->base.kind != EXPR_REFERENCE) {
9708 entity_t *entity = expression->reference.entity;
9709 if (entity->kind != ENTITY_VARIABLE)
9716 * Parse a return statement.
9718 static statement_t *parse_return(void)
9720 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9723 expression_t *return_value = NULL;
9724 if (token.type != ';') {
9725 return_value = parse_expression();
9726 mark_vars_read(return_value, NULL);
9729 const type_t *const func_type = skip_typeref(current_function->base.type);
9730 assert(is_type_function(func_type));
9731 type_t *const return_type = skip_typeref(func_type->function.return_type);
9733 source_position_t const *const pos = &statement->base.source_position;
9734 if (return_value != NULL) {
9735 type_t *return_value_type = skip_typeref(return_value->base.type);
9737 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9738 if (is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9739 /* ISO/IEC 14882:1998(E) §6.6.3:2 */
9740 /* Only warn in C mode, because GCC does the same */
9741 if (c_mode & _CXX || strict_mode) {
9743 "'return' with a value, in function returning 'void'");
9745 warningf(WARN_OTHER, pos, "'return' with a value, in function returning 'void'");
9747 } else if (!(c_mode & _CXX)) { /* ISO/IEC 14882:1998(E) §6.6.3:3 */
9748 /* Only warn in C mode, because GCC does the same */
9751 "'return' with expression in function returning 'void'");
9753 warningf(WARN_OTHER, pos, "'return' with expression in function returning 'void'");
9757 assign_error_t error = semantic_assign(return_type, return_value);
9758 report_assign_error(error, return_type, return_value, "'return'",
9761 return_value = create_implicit_cast(return_value, return_type);
9762 /* check for returning address of a local var */
9763 if (return_value != NULL && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9764 const expression_t *expression = return_value->unary.value;
9765 if (expression_is_local_variable(expression)) {
9766 warningf(WARN_OTHER, pos, "function returns address of local variable");
9769 } else if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9770 /* ISO/IEC 14882:1998(E) §6.6.3:3 */
9771 if (c_mode & _CXX || strict_mode) {
9773 "'return' without value, in function returning non-void");
9775 warningf(WARN_OTHER, pos, "'return' without value, in function returning non-void");
9778 statement->returns.value = return_value;
9780 expect(';', end_error);
9787 * Parse a declaration statement.
9789 static statement_t *parse_declaration_statement(void)
9791 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9793 entity_t *before = current_scope->last_entity;
9795 parse_external_declaration();
9797 parse_declaration(record_entity, DECL_FLAGS_NONE);
9800 declaration_statement_t *const decl = &statement->declaration;
9801 entity_t *const begin =
9802 before != NULL ? before->base.next : current_scope->entities;
9803 decl->declarations_begin = begin;
9804 decl->declarations_end = begin != NULL ? current_scope->last_entity : NULL;
9810 * Parse an expression statement, ie. expr ';'.
9812 static statement_t *parse_expression_statement(void)
9814 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9816 expression_t *const expr = parse_expression();
9817 statement->expression.expression = expr;
9818 mark_vars_read(expr, ENT_ANY);
9820 expect(';', end_error);
9827 * Parse a microsoft __try { } __finally { } or
9828 * __try{ } __except() { }
9830 static statement_t *parse_ms_try_statment(void)
9832 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9835 PUSH_PARENT(statement);
9837 ms_try_statement_t *rem = current_try;
9838 current_try = &statement->ms_try;
9839 statement->ms_try.try_statement = parse_compound_statement(false);
9844 if (next_if(T___except)) {
9845 expect('(', end_error);
9846 add_anchor_token(')');
9847 expression_t *const expr = parse_expression();
9848 mark_vars_read(expr, NULL);
9849 type_t * type = skip_typeref(expr->base.type);
9850 if (is_type_integer(type)) {
9851 type = promote_integer(type);
9852 } else if (is_type_valid(type)) {
9853 errorf(&expr->base.source_position,
9854 "__expect expression is not an integer, but '%T'", type);
9855 type = type_error_type;
9857 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9858 rem_anchor_token(')');
9859 expect(')', end_error);
9860 statement->ms_try.final_statement = parse_compound_statement(false);
9861 } else if (next_if(T__finally)) {
9862 statement->ms_try.final_statement = parse_compound_statement(false);
9864 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9865 return create_invalid_statement();
9869 return create_invalid_statement();
9872 static statement_t *parse_empty_statement(void)
9874 warningf(WARN_EMPTY_STATEMENT, HERE, "statement is empty");
9875 statement_t *const statement = create_empty_statement();
9880 static statement_t *parse_local_label_declaration(void)
9882 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9886 entity_t *begin = NULL;
9887 entity_t *end = NULL;
9888 entity_t **anchor = &begin;
9890 if (token.type != T_IDENTIFIER) {
9891 parse_error_expected("while parsing local label declaration",
9892 T_IDENTIFIER, NULL);
9895 symbol_t *symbol = token.symbol;
9896 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
9897 if (entity != NULL && entity->base.parent_scope == current_scope) {
9898 source_position_t const *const ppos = &entity->base.source_position;
9899 errorf(HERE, "multiple definitions of '%N' (previous definition %P)", entity, ppos);
9901 entity = allocate_entity_zero(ENTITY_LOCAL_LABEL, NAMESPACE_LABEL, symbol);
9902 entity->base.parent_scope = current_scope;
9903 entity->base.source_position = token.source_position;
9906 anchor = &entity->base.next;
9909 environment_push(entity);
9912 } while (next_if(','));
9913 expect(';', end_error);
9915 statement->declaration.declarations_begin = begin;
9916 statement->declaration.declarations_end = end;
9920 static void parse_namespace_definition(void)
9924 entity_t *entity = NULL;
9925 symbol_t *symbol = NULL;
9927 if (token.type == T_IDENTIFIER) {
9928 symbol = token.symbol;
9931 entity = get_entity(symbol, NAMESPACE_NORMAL);
9933 && entity->kind != ENTITY_NAMESPACE
9934 && entity->base.parent_scope == current_scope) {
9935 if (is_entity_valid(entity)) {
9936 error_redefined_as_different_kind(&token.source_position,
9937 entity, ENTITY_NAMESPACE);
9943 if (entity == NULL) {
9944 entity = allocate_entity_zero(ENTITY_NAMESPACE, NAMESPACE_NORMAL, symbol);
9945 entity->base.source_position = token.source_position;
9946 entity->base.parent_scope = current_scope;
9949 if (token.type == '=') {
9950 /* TODO: parse namespace alias */
9951 panic("namespace alias definition not supported yet");
9954 environment_push(entity);
9955 append_entity(current_scope, entity);
9957 size_t const top = environment_top();
9958 scope_t *old_scope = scope_push(&entity->namespacee.members);
9960 entity_t *old_current_entity = current_entity;
9961 current_entity = entity;
9963 expect('{', end_error);
9965 expect('}', end_error);
9968 assert(current_scope == &entity->namespacee.members);
9969 assert(current_entity == entity);
9970 current_entity = old_current_entity;
9971 scope_pop(old_scope);
9972 environment_pop_to(top);
9976 * Parse a statement.
9977 * There's also parse_statement() which additionally checks for
9978 * "statement has no effect" warnings
9980 static statement_t *intern_parse_statement(void)
9982 statement_t *statement = NULL;
9984 /* declaration or statement */
9985 add_anchor_token(';');
9986 switch (token.type) {
9987 case T_IDENTIFIER: {
9988 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9989 if (la1_type == ':') {
9990 statement = parse_label_statement();
9991 } else if (is_typedef_symbol(token.symbol)) {
9992 statement = parse_declaration_statement();
9994 /* it's an identifier, the grammar says this must be an
9995 * expression statement. However it is common that users mistype
9996 * declaration types, so we guess a bit here to improve robustness
9997 * for incorrect programs */
10001 if (get_entity(token.symbol, NAMESPACE_NORMAL) != NULL) {
10003 statement = parse_expression_statement();
10007 statement = parse_declaration_statement();
10015 case T___extension__:
10016 /* This can be a prefix to a declaration or an expression statement.
10017 * We simply eat it now and parse the rest with tail recursion. */
10018 while (next_if(T___extension__)) {}
10019 bool old_gcc_extension = in_gcc_extension;
10020 in_gcc_extension = true;
10021 statement = intern_parse_statement();
10022 in_gcc_extension = old_gcc_extension;
10026 statement = parse_declaration_statement();
10030 statement = parse_local_label_declaration();
10033 case ';': statement = parse_empty_statement(); break;
10034 case '{': statement = parse_compound_statement(false); break;
10035 case T___leave: statement = parse_leave_statement(); break;
10036 case T___try: statement = parse_ms_try_statment(); break;
10037 case T_asm: statement = parse_asm_statement(); break;
10038 case T_break: statement = parse_break(); break;
10039 case T_case: statement = parse_case_statement(); break;
10040 case T_continue: statement = parse_continue(); break;
10041 case T_default: statement = parse_default_statement(); break;
10042 case T_do: statement = parse_do(); break;
10043 case T_for: statement = parse_for(); break;
10044 case T_goto: statement = parse_goto(); break;
10045 case T_if: statement = parse_if(); break;
10046 case T_return: statement = parse_return(); break;
10047 case T_switch: statement = parse_switch(); break;
10048 case T_while: statement = parse_while(); break;
10051 statement = parse_expression_statement();
10055 errorf(HERE, "unexpected token %K while parsing statement", &token);
10056 statement = create_invalid_statement();
10061 rem_anchor_token(';');
10063 assert(statement != NULL
10064 && statement->base.source_position.input_name != NULL);
10070 * parse a statement and emits "statement has no effect" warning if needed
10071 * (This is really a wrapper around intern_parse_statement with check for 1
10072 * single warning. It is needed, because for statement expressions we have
10073 * to avoid the warning on the last statement)
10075 static statement_t *parse_statement(void)
10077 statement_t *statement = intern_parse_statement();
10079 if (statement->kind == STATEMENT_EXPRESSION) {
10080 expression_t *expression = statement->expression.expression;
10081 if (!expression_has_effect(expression)) {
10082 warningf(WARN_UNUSED_VALUE, &expression->base.source_position, "statement has no effect");
10090 * Parse a compound statement.
10092 static statement_t *parse_compound_statement(bool inside_expression_statement)
10094 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10096 PUSH_PARENT(statement);
10099 add_anchor_token('}');
10100 /* tokens, which can start a statement */
10101 /* TODO MS, __builtin_FOO */
10102 add_anchor_token('!');
10103 add_anchor_token('&');
10104 add_anchor_token('(');
10105 add_anchor_token('*');
10106 add_anchor_token('+');
10107 add_anchor_token('-');
10108 add_anchor_token('{');
10109 add_anchor_token('~');
10110 add_anchor_token(T_CHARACTER_CONSTANT);
10111 add_anchor_token(T_COLONCOLON);
10112 add_anchor_token(T_FLOATINGPOINT);
10113 add_anchor_token(T_IDENTIFIER);
10114 add_anchor_token(T_INTEGER);
10115 add_anchor_token(T_MINUSMINUS);
10116 add_anchor_token(T_PLUSPLUS);
10117 add_anchor_token(T_STRING_LITERAL);
10118 add_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10119 add_anchor_token(T_WIDE_STRING_LITERAL);
10120 add_anchor_token(T__Bool);
10121 add_anchor_token(T__Complex);
10122 add_anchor_token(T__Imaginary);
10123 add_anchor_token(T___FUNCTION__);
10124 add_anchor_token(T___PRETTY_FUNCTION__);
10125 add_anchor_token(T___alignof__);
10126 add_anchor_token(T___attribute__);
10127 add_anchor_token(T___builtin_va_start);
10128 add_anchor_token(T___extension__);
10129 add_anchor_token(T___func__);
10130 add_anchor_token(T___imag__);
10131 add_anchor_token(T___label__);
10132 add_anchor_token(T___real__);
10133 add_anchor_token(T___thread);
10134 add_anchor_token(T_asm);
10135 add_anchor_token(T_auto);
10136 add_anchor_token(T_bool);
10137 add_anchor_token(T_break);
10138 add_anchor_token(T_case);
10139 add_anchor_token(T_char);
10140 add_anchor_token(T_class);
10141 add_anchor_token(T_const);
10142 add_anchor_token(T_const_cast);
10143 add_anchor_token(T_continue);
10144 add_anchor_token(T_default);
10145 add_anchor_token(T_delete);
10146 add_anchor_token(T_double);
10147 add_anchor_token(T_do);
10148 add_anchor_token(T_dynamic_cast);
10149 add_anchor_token(T_enum);
10150 add_anchor_token(T_extern);
10151 add_anchor_token(T_false);
10152 add_anchor_token(T_float);
10153 add_anchor_token(T_for);
10154 add_anchor_token(T_goto);
10155 add_anchor_token(T_if);
10156 add_anchor_token(T_inline);
10157 add_anchor_token(T_int);
10158 add_anchor_token(T_long);
10159 add_anchor_token(T_new);
10160 add_anchor_token(T_operator);
10161 add_anchor_token(T_register);
10162 add_anchor_token(T_reinterpret_cast);
10163 add_anchor_token(T_restrict);
10164 add_anchor_token(T_return);
10165 add_anchor_token(T_short);
10166 add_anchor_token(T_signed);
10167 add_anchor_token(T_sizeof);
10168 add_anchor_token(T_static);
10169 add_anchor_token(T_static_cast);
10170 add_anchor_token(T_struct);
10171 add_anchor_token(T_switch);
10172 add_anchor_token(T_template);
10173 add_anchor_token(T_this);
10174 add_anchor_token(T_throw);
10175 add_anchor_token(T_true);
10176 add_anchor_token(T_try);
10177 add_anchor_token(T_typedef);
10178 add_anchor_token(T_typeid);
10179 add_anchor_token(T_typename);
10180 add_anchor_token(T_typeof);
10181 add_anchor_token(T_union);
10182 add_anchor_token(T_unsigned);
10183 add_anchor_token(T_using);
10184 add_anchor_token(T_void);
10185 add_anchor_token(T_volatile);
10186 add_anchor_token(T_wchar_t);
10187 add_anchor_token(T_while);
10189 size_t const top = environment_top();
10190 scope_t *old_scope = scope_push(&statement->compound.scope);
10192 statement_t **anchor = &statement->compound.statements;
10193 bool only_decls_so_far = true;
10194 while (token.type != '}') {
10195 if (token.type == T_EOF) {
10196 errorf(&statement->base.source_position,
10197 "EOF while parsing compound statement");
10200 statement_t *sub_statement = intern_parse_statement();
10201 if (is_invalid_statement(sub_statement)) {
10202 /* an error occurred. if we are at an anchor, return */
10208 if (sub_statement->kind != STATEMENT_DECLARATION) {
10209 only_decls_so_far = false;
10210 } else if (!only_decls_so_far) {
10211 source_position_t const *const pos = &sub_statement->base.source_position;
10212 warningf(WARN_DECLARATION_AFTER_STATEMENT, pos, "ISO C90 forbids mixed declarations and code");
10215 *anchor = sub_statement;
10217 while (sub_statement->base.next != NULL)
10218 sub_statement = sub_statement->base.next;
10220 anchor = &sub_statement->base.next;
10224 /* look over all statements again to produce no effect warnings */
10225 if (is_warn_on(WARN_UNUSED_VALUE)) {
10226 statement_t *sub_statement = statement->compound.statements;
10227 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10228 if (sub_statement->kind != STATEMENT_EXPRESSION)
10230 /* don't emit a warning for the last expression in an expression
10231 * statement as it has always an effect */
10232 if (inside_expression_statement && sub_statement->base.next == NULL)
10235 expression_t *expression = sub_statement->expression.expression;
10236 if (!expression_has_effect(expression)) {
10237 warningf(WARN_UNUSED_VALUE, &expression->base.source_position, "statement has no effect");
10243 rem_anchor_token(T_while);
10244 rem_anchor_token(T_wchar_t);
10245 rem_anchor_token(T_volatile);
10246 rem_anchor_token(T_void);
10247 rem_anchor_token(T_using);
10248 rem_anchor_token(T_unsigned);
10249 rem_anchor_token(T_union);
10250 rem_anchor_token(T_typeof);
10251 rem_anchor_token(T_typename);
10252 rem_anchor_token(T_typeid);
10253 rem_anchor_token(T_typedef);
10254 rem_anchor_token(T_try);
10255 rem_anchor_token(T_true);
10256 rem_anchor_token(T_throw);
10257 rem_anchor_token(T_this);
10258 rem_anchor_token(T_template);
10259 rem_anchor_token(T_switch);
10260 rem_anchor_token(T_struct);
10261 rem_anchor_token(T_static_cast);
10262 rem_anchor_token(T_static);
10263 rem_anchor_token(T_sizeof);
10264 rem_anchor_token(T_signed);
10265 rem_anchor_token(T_short);
10266 rem_anchor_token(T_return);
10267 rem_anchor_token(T_restrict);
10268 rem_anchor_token(T_reinterpret_cast);
10269 rem_anchor_token(T_register);
10270 rem_anchor_token(T_operator);
10271 rem_anchor_token(T_new);
10272 rem_anchor_token(T_long);
10273 rem_anchor_token(T_int);
10274 rem_anchor_token(T_inline);
10275 rem_anchor_token(T_if);
10276 rem_anchor_token(T_goto);
10277 rem_anchor_token(T_for);
10278 rem_anchor_token(T_float);
10279 rem_anchor_token(T_false);
10280 rem_anchor_token(T_extern);
10281 rem_anchor_token(T_enum);
10282 rem_anchor_token(T_dynamic_cast);
10283 rem_anchor_token(T_do);
10284 rem_anchor_token(T_double);
10285 rem_anchor_token(T_delete);
10286 rem_anchor_token(T_default);
10287 rem_anchor_token(T_continue);
10288 rem_anchor_token(T_const_cast);
10289 rem_anchor_token(T_const);
10290 rem_anchor_token(T_class);
10291 rem_anchor_token(T_char);
10292 rem_anchor_token(T_case);
10293 rem_anchor_token(T_break);
10294 rem_anchor_token(T_bool);
10295 rem_anchor_token(T_auto);
10296 rem_anchor_token(T_asm);
10297 rem_anchor_token(T___thread);
10298 rem_anchor_token(T___real__);
10299 rem_anchor_token(T___label__);
10300 rem_anchor_token(T___imag__);
10301 rem_anchor_token(T___func__);
10302 rem_anchor_token(T___extension__);
10303 rem_anchor_token(T___builtin_va_start);
10304 rem_anchor_token(T___attribute__);
10305 rem_anchor_token(T___alignof__);
10306 rem_anchor_token(T___PRETTY_FUNCTION__);
10307 rem_anchor_token(T___FUNCTION__);
10308 rem_anchor_token(T__Imaginary);
10309 rem_anchor_token(T__Complex);
10310 rem_anchor_token(T__Bool);
10311 rem_anchor_token(T_WIDE_STRING_LITERAL);
10312 rem_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10313 rem_anchor_token(T_STRING_LITERAL);
10314 rem_anchor_token(T_PLUSPLUS);
10315 rem_anchor_token(T_MINUSMINUS);
10316 rem_anchor_token(T_INTEGER);
10317 rem_anchor_token(T_IDENTIFIER);
10318 rem_anchor_token(T_FLOATINGPOINT);
10319 rem_anchor_token(T_COLONCOLON);
10320 rem_anchor_token(T_CHARACTER_CONSTANT);
10321 rem_anchor_token('~');
10322 rem_anchor_token('{');
10323 rem_anchor_token('-');
10324 rem_anchor_token('+');
10325 rem_anchor_token('*');
10326 rem_anchor_token('(');
10327 rem_anchor_token('&');
10328 rem_anchor_token('!');
10329 rem_anchor_token('}');
10330 assert(current_scope == &statement->compound.scope);
10331 scope_pop(old_scope);
10332 environment_pop_to(top);
10339 * Check for unused global static functions and variables
10341 static void check_unused_globals(void)
10343 if (!is_warn_on(WARN_UNUSED_FUNCTION) && !is_warn_on(WARN_UNUSED_VARIABLE))
10346 for (const entity_t *entity = file_scope->entities; entity != NULL;
10347 entity = entity->base.next) {
10348 if (!is_declaration(entity))
10351 const declaration_t *declaration = &entity->declaration;
10352 if (declaration->used ||
10353 declaration->modifiers & DM_UNUSED ||
10354 declaration->modifiers & DM_USED ||
10355 declaration->storage_class != STORAGE_CLASS_STATIC)
10360 if (entity->kind == ENTITY_FUNCTION) {
10361 /* inhibit warning for static inline functions */
10362 if (entity->function.is_inline)
10365 why = WARN_UNUSED_FUNCTION;
10366 s = entity->function.statement != NULL ? "defined" : "declared";
10368 why = WARN_UNUSED_VARIABLE;
10372 warningf(why, &declaration->base.source_position, "'%#N' %s but not used", entity, s);
10376 static void parse_global_asm(void)
10378 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10381 expect('(', end_error);
10383 statement->asms.asm_text = parse_string_literals();
10384 statement->base.next = unit->global_asm;
10385 unit->global_asm = statement;
10387 expect(')', end_error);
10388 expect(';', end_error);
10393 static void parse_linkage_specification(void)
10397 source_position_t const pos = *HERE;
10398 char const *const linkage = parse_string_literals().begin;
10400 linkage_kind_t old_linkage = current_linkage;
10401 linkage_kind_t new_linkage;
10402 if (strcmp(linkage, "C") == 0) {
10403 new_linkage = LINKAGE_C;
10404 } else if (strcmp(linkage, "C++") == 0) {
10405 new_linkage = LINKAGE_CXX;
10407 errorf(&pos, "linkage string \"%s\" not recognized", linkage);
10408 new_linkage = LINKAGE_INVALID;
10410 current_linkage = new_linkage;
10412 if (next_if('{')) {
10414 expect('}', end_error);
10420 assert(current_linkage == new_linkage);
10421 current_linkage = old_linkage;
10424 static void parse_external(void)
10426 switch (token.type) {
10427 DECLARATION_START_NO_EXTERN
10429 case T___extension__:
10430 /* tokens below are for implicit int */
10431 case '&': /* & x; -> int& x; (and error later, because C++ has no
10433 case '*': /* * x; -> int* x; */
10434 case '(': /* (x); -> int (x); */
10435 parse_external_declaration();
10439 if (look_ahead(1)->type == T_STRING_LITERAL) {
10440 parse_linkage_specification();
10442 parse_external_declaration();
10447 parse_global_asm();
10451 parse_namespace_definition();
10455 if (!strict_mode) {
10456 warningf(WARN_OTHER, HERE, "stray ';' outside of function");
10463 errorf(HERE, "stray %K outside of function", &token);
10464 if (token.type == '(' || token.type == '{' || token.type == '[')
10465 eat_until_matching_token(token.type);
10471 static void parse_externals(void)
10473 add_anchor_token('}');
10474 add_anchor_token(T_EOF);
10477 /* make a copy of the anchor set, so we can check if it is restored after parsing */
10478 unsigned char token_anchor_copy[T_LAST_TOKEN];
10479 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10482 while (token.type != T_EOF && token.type != '}') {
10484 for (int i = 0; i < T_LAST_TOKEN; ++i) {
10485 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10487 /* the anchor set and its copy differs */
10488 internal_errorf(HERE, "Leaked anchor token %k %d times", i, count);
10491 if (in_gcc_extension) {
10492 /* an gcc extension scope was not closed */
10493 internal_errorf(HERE, "Leaked __extension__");
10500 rem_anchor_token(T_EOF);
10501 rem_anchor_token('}');
10505 * Parse a translation unit.
10507 static void parse_translation_unit(void)
10509 add_anchor_token(T_EOF);
10514 if (token.type == T_EOF)
10517 errorf(HERE, "stray %K outside of function", &token);
10518 if (token.type == '(' || token.type == '{' || token.type == '[')
10519 eat_until_matching_token(token.type);
10524 void set_default_visibility(elf_visibility_tag_t visibility)
10526 default_visibility = visibility;
10532 * @return the translation unit or NULL if errors occurred.
10534 void start_parsing(void)
10536 environment_stack = NEW_ARR_F(stack_entry_t, 0);
10537 label_stack = NEW_ARR_F(stack_entry_t, 0);
10538 diagnostic_count = 0;
10542 print_to_file(stderr);
10544 assert(unit == NULL);
10545 unit = allocate_ast_zero(sizeof(unit[0]));
10547 assert(file_scope == NULL);
10548 file_scope = &unit->scope;
10550 assert(current_scope == NULL);
10551 scope_push(&unit->scope);
10553 create_gnu_builtins();
10555 create_microsoft_intrinsics();
10558 translation_unit_t *finish_parsing(void)
10560 assert(current_scope == &unit->scope);
10563 assert(file_scope == &unit->scope);
10564 check_unused_globals();
10567 DEL_ARR_F(environment_stack);
10568 DEL_ARR_F(label_stack);
10570 translation_unit_t *result = unit;
10575 /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
10576 * are given length one. */
10577 static void complete_incomplete_arrays(void)
10579 size_t n = ARR_LEN(incomplete_arrays);
10580 for (size_t i = 0; i != n; ++i) {
10581 declaration_t *const decl = incomplete_arrays[i];
10582 type_t *const type = skip_typeref(decl->type);
10584 if (!is_type_incomplete(type))
10587 source_position_t const *const pos = &decl->base.source_position;
10588 warningf(WARN_OTHER, pos, "array '%#N' assumed to have one element", (entity_t const*)decl);
10590 type_t *const new_type = duplicate_type(type);
10591 new_type->array.size_constant = true;
10592 new_type->array.has_implicit_size = true;
10593 new_type->array.size = 1;
10595 type_t *const result = identify_new_type(new_type);
10597 decl->type = result;
10601 void prepare_main_collect2(entity_t *entity)
10603 // create call to __main
10604 symbol_t *symbol = symbol_table_insert("__main");
10605 entity_t *subsubmain_ent
10606 = create_implicit_function(symbol, &builtin_source_position);
10608 expression_t *ref = allocate_expression_zero(EXPR_REFERENCE);
10609 type_t *ftype = subsubmain_ent->declaration.type;
10610 ref->base.source_position = builtin_source_position;
10611 ref->base.type = make_pointer_type(ftype, TYPE_QUALIFIER_NONE);
10612 ref->reference.entity = subsubmain_ent;
10614 expression_t *call = allocate_expression_zero(EXPR_CALL);
10615 call->base.source_position = builtin_source_position;
10616 call->base.type = type_void;
10617 call->call.function = ref;
10619 statement_t *expr_statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10620 expr_statement->base.source_position = builtin_source_position;
10621 expr_statement->expression.expression = call;
10623 statement_t *statement = entity->function.statement;
10624 assert(statement->kind == STATEMENT_COMPOUND);
10625 compound_statement_t *compounds = &statement->compound;
10627 expr_statement->base.next = compounds->statements;
10628 compounds->statements = expr_statement;
10633 lookahead_bufpos = 0;
10634 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10637 current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
10638 incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
10639 parse_translation_unit();
10640 complete_incomplete_arrays();
10641 DEL_ARR_F(incomplete_arrays);
10642 incomplete_arrays = NULL;
10646 * Initialize the parser.
10648 void init_parser(void)
10650 sym_anonymous = symbol_table_insert("<anonymous>");
10652 memset(token_anchor_set, 0, sizeof(token_anchor_set));
10654 init_expression_parsers();
10655 obstack_init(&temp_obst);
10659 * Terminate the parser.
10661 void exit_parser(void)
10663 obstack_free(&temp_obst, NULL);