2 * This file is part of cparser.
3 * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27 #include "diagnostic.h"
28 #include "format_check.h"
34 #include "type_hash.h"
36 #include "lang_features.h"
38 #include "adt/bitfiddle.h"
39 #include "adt/error.h"
40 #include "adt/array.h"
42 /** if wchar_t is equal to unsigned short. */
43 bool opt_short_wchar_t =
50 //#define PRINT_TOKENS
51 #define MAX_LOOKAHEAD 2
54 declaration_t *old_declaration;
56 unsigned short namespc;
59 typedef struct argument_list_t argument_list_t;
60 struct argument_list_t {
62 argument_list_t *next;
65 typedef struct gnu_attribute_t gnu_attribute_t;
66 struct gnu_attribute_t {
67 gnu_attribute_kind_t kind; /**< The kind of the GNU attribute. */
68 gnu_attribute_t *next;
69 bool invalid; /**< Set if this attribute had argument errors, */
70 bool have_arguments; /**< True, if this attribute has arguments. */
74 atomic_type_kind_t akind;
75 long argument; /**< Single argument. */
76 argument_list_t *arguments; /**< List of argument expressions. */
80 typedef struct declaration_specifiers_t declaration_specifiers_t;
81 struct declaration_specifiers_t {
82 source_position_t source_position;
83 unsigned char declared_storage_class;
84 unsigned char alignment; /**< Alignment, 0 if not set. */
85 unsigned int is_inline : 1;
86 unsigned int deprecated : 1;
87 decl_modifiers_t modifiers; /**< declaration modifiers */
88 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
89 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
90 symbol_t *get_property_sym; /**< the name of the get property if set. */
91 symbol_t *put_property_sym; /**< the name of the put property if set. */
96 * An environment for parsing initializers (and compound literals).
98 typedef struct parse_initializer_env_t {
99 type_t *type; /**< the type of the initializer. In case of an
100 array type with unspecified size this gets
101 adjusted to the actual size. */
102 declaration_t *declaration; /**< the declaration that is initialized if any */
103 bool must_be_constant;
104 } parse_initializer_env_t;
106 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration, bool is_definition);
108 static token_t token;
109 static token_t lookahead_buffer[MAX_LOOKAHEAD];
110 static int lookahead_bufpos;
111 static stack_entry_t *environment_stack = NULL;
112 static stack_entry_t *label_stack = NULL;
113 static stack_entry_t *local_label_stack = NULL;
114 static scope_t *global_scope = NULL;
115 static scope_t *scope = NULL;
116 static declaration_t *last_declaration = NULL;
117 static declaration_t *current_function = NULL;
118 static declaration_t *current_init_decl = NULL;
119 static switch_statement_t *current_switch = NULL;
120 static statement_t *current_loop = NULL;
121 static statement_t *current_parent = NULL;
122 static ms_try_statement_t *current_try = NULL;
123 static goto_statement_t *goto_first = NULL;
124 static goto_statement_t *goto_last = NULL;
125 static label_statement_t *label_first = NULL;
126 static label_statement_t *label_last = NULL;
127 static translation_unit_t *unit = NULL;
128 static struct obstack temp_obst;
130 #define PUSH_PARENT(stmt) \
131 statement_t *const prev_parent = current_parent; \
132 current_parent = (stmt);
133 #define POP_PARENT ((void)(current_parent = prev_parent))
135 static source_position_t null_position = { NULL, 0 };
137 /* symbols for Microsoft extended-decl-modifier */
138 static const symbol_t *sym_align = NULL;
139 static const symbol_t *sym_allocate = NULL;
140 static const symbol_t *sym_dllimport = NULL;
141 static const symbol_t *sym_dllexport = NULL;
142 static const symbol_t *sym_naked = NULL;
143 static const symbol_t *sym_noinline = NULL;
144 static const symbol_t *sym_noreturn = NULL;
145 static const symbol_t *sym_nothrow = NULL;
146 static const symbol_t *sym_novtable = NULL;
147 static const symbol_t *sym_property = NULL;
148 static const symbol_t *sym_get = NULL;
149 static const symbol_t *sym_put = NULL;
150 static const symbol_t *sym_selectany = NULL;
151 static const symbol_t *sym_thread = NULL;
152 static const symbol_t *sym_uuid = NULL;
153 static const symbol_t *sym_deprecated = NULL;
154 static const symbol_t *sym_restrict = NULL;
155 static const symbol_t *sym_noalias = NULL;
157 /** The token anchor set */
158 static unsigned char token_anchor_set[T_LAST_TOKEN];
160 /** The current source position. */
161 #define HERE (&token.source_position)
163 static type_t *type_valist;
165 static statement_t *parse_compound_statement(bool inside_expression_statement);
166 static statement_t *parse_statement(void);
168 static expression_t *parse_sub_expression(unsigned precedence);
169 static expression_t *parse_expression(void);
170 static type_t *parse_typename(void);
172 static void parse_compound_type_entries(declaration_t *compound_declaration);
173 static declaration_t *parse_declarator(
174 const declaration_specifiers_t *specifiers, bool may_be_abstract);
175 static declaration_t *record_declaration(declaration_t *declaration, bool is_definition);
177 static void semantic_comparison(binary_expression_t *expression);
179 #define STORAGE_CLASSES \
187 #define TYPE_QUALIFIERS \
192 case T__forceinline: \
193 case T___attribute__:
195 #ifdef PROVIDE_COMPLEX
196 #define COMPLEX_SPECIFIERS \
198 #define IMAGINARY_SPECIFIERS \
201 #define COMPLEX_SPECIFIERS
202 #define IMAGINARY_SPECIFIERS
205 #define TYPE_SPECIFIERS \
220 case T___builtin_va_list: \
225 #define DECLARATION_START \
230 #define TYPENAME_START \
235 * Allocate an AST node with given size and
236 * initialize all fields with zero.
238 static void *allocate_ast_zero(size_t size)
240 void *res = allocate_ast(size);
241 memset(res, 0, size);
245 static declaration_t *allocate_declaration_zero(void)
247 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
248 declaration->type = type_error_type;
249 declaration->alignment = 0;
254 * Returns the size of a statement node.
256 * @param kind the statement kind
258 static size_t get_statement_struct_size(statement_kind_t kind)
260 static const size_t sizes[] = {
261 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
262 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
263 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
264 [STATEMENT_RETURN] = sizeof(return_statement_t),
265 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
266 [STATEMENT_IF] = sizeof(if_statement_t),
267 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
268 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
269 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
270 [STATEMENT_BREAK] = sizeof(statement_base_t),
271 [STATEMENT_GOTO] = sizeof(goto_statement_t),
272 [STATEMENT_LABEL] = sizeof(label_statement_t),
273 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
274 [STATEMENT_WHILE] = sizeof(while_statement_t),
275 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
276 [STATEMENT_FOR] = sizeof(for_statement_t),
277 [STATEMENT_ASM] = sizeof(asm_statement_t),
278 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
279 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
281 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
282 assert(sizes[kind] != 0);
287 * Returns the size of an expression node.
289 * @param kind the expression kind
291 static size_t get_expression_struct_size(expression_kind_t kind)
293 static const size_t sizes[] = {
294 [EXPR_INVALID] = sizeof(expression_base_t),
295 [EXPR_REFERENCE] = sizeof(reference_expression_t),
296 [EXPR_CONST] = sizeof(const_expression_t),
297 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
298 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
299 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
300 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
301 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
302 [EXPR_CALL] = sizeof(call_expression_t),
303 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
304 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
305 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
306 [EXPR_SELECT] = sizeof(select_expression_t),
307 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
308 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
309 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
310 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
311 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
312 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
313 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
314 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
315 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
316 [EXPR_VA_START] = sizeof(va_start_expression_t),
317 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
318 [EXPR_STATEMENT] = sizeof(statement_expression_t),
319 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
321 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
322 return sizes[EXPR_UNARY_FIRST];
324 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
325 return sizes[EXPR_BINARY_FIRST];
327 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
328 assert(sizes[kind] != 0);
333 * Allocate a statement node of given kind and initialize all
336 static statement_t *allocate_statement_zero(statement_kind_t kind)
338 size_t size = get_statement_struct_size(kind);
339 statement_t *res = allocate_ast_zero(size);
341 res->base.kind = kind;
342 res->base.parent = current_parent;
347 * Allocate an expression node of given kind and initialize all
350 static expression_t *allocate_expression_zero(expression_kind_t kind)
352 size_t size = get_expression_struct_size(kind);
353 expression_t *res = allocate_ast_zero(size);
355 res->base.kind = kind;
356 res->base.type = type_error_type;
361 * Creates a new invalid expression.
363 static expression_t *create_invalid_expression(void)
365 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
366 expression->base.source_position = token.source_position;
371 * Creates a new invalid statement.
373 static statement_t *create_invalid_statement(void)
375 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
376 statement->base.source_position = token.source_position;
381 * Allocate a new empty statement.
383 static statement_t *create_empty_statement(void)
385 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
386 statement->base.source_position = token.source_position;
391 * Returns the size of a type node.
393 * @param kind the type kind
395 static size_t get_type_struct_size(type_kind_t kind)
397 static const size_t sizes[] = {
398 [TYPE_ATOMIC] = sizeof(atomic_type_t),
399 [TYPE_COMPLEX] = sizeof(complex_type_t),
400 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
401 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
402 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
403 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
404 [TYPE_ENUM] = sizeof(enum_type_t),
405 [TYPE_FUNCTION] = sizeof(function_type_t),
406 [TYPE_POINTER] = sizeof(pointer_type_t),
407 [TYPE_ARRAY] = sizeof(array_type_t),
408 [TYPE_BUILTIN] = sizeof(builtin_type_t),
409 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
410 [TYPE_TYPEOF] = sizeof(typeof_type_t),
412 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
413 assert(kind <= TYPE_TYPEOF);
414 assert(sizes[kind] != 0);
419 * Allocate a type node of given kind and initialize all
422 * @param kind type kind to allocate
423 * @param source_position the source position of the type definition
425 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
427 size_t size = get_type_struct_size(kind);
428 type_t *res = obstack_alloc(type_obst, size);
429 memset(res, 0, size);
431 res->base.kind = kind;
432 res->base.source_position = *source_position;
437 * Returns the size of an initializer node.
439 * @param kind the initializer kind
441 static size_t get_initializer_size(initializer_kind_t kind)
443 static const size_t sizes[] = {
444 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
445 [INITIALIZER_STRING] = sizeof(initializer_string_t),
446 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
447 [INITIALIZER_LIST] = sizeof(initializer_list_t),
448 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
450 assert(kind < sizeof(sizes) / sizeof(*sizes));
451 assert(sizes[kind] != 0);
456 * Allocate an initializer node of given kind and initialize all
459 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
461 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
468 * Free a type from the type obstack.
470 static void free_type(void *type)
472 obstack_free(type_obst, type);
476 * Returns the index of the top element of the environment stack.
478 static size_t environment_top(void)
480 return ARR_LEN(environment_stack);
484 * Returns the index of the top element of the global label stack.
486 static size_t label_top(void)
488 return ARR_LEN(label_stack);
492 * Returns the index of the top element of the local label stack.
494 static size_t local_label_top(void)
496 return ARR_LEN(local_label_stack);
500 * Return the next token.
502 static inline void next_token(void)
504 token = lookahead_buffer[lookahead_bufpos];
505 lookahead_buffer[lookahead_bufpos] = lexer_token;
508 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
511 print_token(stderr, &token);
512 fprintf(stderr, "\n");
517 * Return the next token with a given lookahead.
519 static inline const token_t *look_ahead(int num)
521 assert(num > 0 && num <= MAX_LOOKAHEAD);
522 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
523 return &lookahead_buffer[pos];
527 * Adds a token to the token anchor set (a multi-set).
529 static void add_anchor_token(int token_type)
531 assert(0 <= token_type && token_type < T_LAST_TOKEN);
532 ++token_anchor_set[token_type];
535 static int save_and_reset_anchor_state(int token_type)
537 assert(0 <= token_type && token_type < T_LAST_TOKEN);
538 int count = token_anchor_set[token_type];
539 token_anchor_set[token_type] = 0;
543 static void restore_anchor_state(int token_type, int count)
545 assert(0 <= token_type && token_type < T_LAST_TOKEN);
546 token_anchor_set[token_type] = count;
550 * Remove a token from the token anchor set (a multi-set).
552 static void rem_anchor_token(int token_type)
554 assert(0 <= token_type && token_type < T_LAST_TOKEN);
555 --token_anchor_set[token_type];
558 static bool at_anchor(void)
562 return token_anchor_set[token.type];
566 * Eat tokens until a matching token is found.
568 static void eat_until_matching_token(int type)
572 case '(': end_token = ')'; break;
573 case '{': end_token = '}'; break;
574 case '[': end_token = ']'; break;
575 default: end_token = type; break;
578 unsigned parenthesis_count = 0;
579 unsigned brace_count = 0;
580 unsigned bracket_count = 0;
581 while (token.type != end_token ||
582 parenthesis_count != 0 ||
584 bracket_count != 0) {
585 switch (token.type) {
587 case '(': ++parenthesis_count; break;
588 case '{': ++brace_count; break;
589 case '[': ++bracket_count; break;
592 if (parenthesis_count > 0)
602 if (bracket_count > 0)
605 if (token.type == end_token &&
606 parenthesis_count == 0 &&
620 * Eat input tokens until an anchor is found.
622 static void eat_until_anchor(void)
624 if (token.type == T_EOF)
626 while (token_anchor_set[token.type] == 0) {
627 if (token.type == '(' || token.type == '{' || token.type == '[')
628 eat_until_matching_token(token.type);
629 if (token.type == T_EOF)
635 static void eat_block(void)
637 eat_until_matching_token('{');
638 if (token.type == '}')
643 * eat all token until a ';' is reached or a stop token is found.
645 static void eat_statement(void)
647 eat_until_matching_token(';');
648 if (token.type == ';')
652 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while (0)
655 * Report a parse error because an expected token was not found.
658 #if defined __GNUC__ && __GNUC__ >= 4
659 __attribute__((sentinel))
661 void parse_error_expected(const char *message, ...)
663 if (message != NULL) {
664 errorf(HERE, "%s", message);
667 va_start(ap, message);
668 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
673 * Report a type error.
675 static void type_error(const char *msg, const source_position_t *source_position,
678 errorf(source_position, "%s, but found type '%T'", msg, type);
682 * Report an incompatible type.
684 static void type_error_incompatible(const char *msg,
685 const source_position_t *source_position, type_t *type1, type_t *type2)
687 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
692 * Expect the the current token is the expected token.
693 * If not, generate an error, eat the current statement,
694 * and goto the end_error label.
696 #define expect(expected) \
698 if (UNLIKELY(token.type != (expected))) { \
699 parse_error_expected(NULL, (expected), NULL); \
700 add_anchor_token(expected); \
701 eat_until_anchor(); \
702 if (token.type == expected) \
704 rem_anchor_token(expected); \
710 static void set_scope(scope_t *new_scope)
713 scope->last_declaration = last_declaration;
717 last_declaration = new_scope->last_declaration;
721 * Search a symbol in a given namespace and returns its declaration or
722 * NULL if this symbol was not found.
724 static declaration_t *get_declaration(const symbol_t *const symbol,
725 const namespace_t namespc)
727 declaration_t *declaration = symbol->declaration;
728 for( ; declaration != NULL; declaration = declaration->symbol_next) {
729 if (declaration->namespc == namespc)
737 * pushs an environment_entry on the environment stack and links the
738 * corresponding symbol to the new entry
740 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
742 symbol_t *symbol = declaration->symbol;
743 namespace_t namespc = (namespace_t) declaration->namespc;
745 /* replace/add declaration into declaration list of the symbol */
746 declaration_t *iter = symbol->declaration;
748 symbol->declaration = declaration;
750 declaration_t *iter_last = NULL;
751 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
752 /* replace an entry? */
753 if (iter->namespc == namespc) {
754 if (iter_last == NULL) {
755 symbol->declaration = declaration;
757 iter_last->symbol_next = declaration;
759 declaration->symbol_next = iter->symbol_next;
764 assert(iter_last->symbol_next == NULL);
765 iter_last->symbol_next = declaration;
769 /* remember old declaration */
771 entry.symbol = symbol;
772 entry.old_declaration = iter;
773 entry.namespc = (unsigned short) namespc;
774 ARR_APP1(stack_entry_t, *stack_ptr, entry);
778 * Push a declaration on the environment stack.
780 * @param declaration the declaration
782 static void environment_push(declaration_t *declaration)
784 assert(declaration->source_position.input_name != NULL);
785 assert(declaration->parent_scope != NULL);
786 stack_push(&environment_stack, declaration);
790 * Push a declaration on the global label stack.
792 * @param declaration the declaration
794 static void label_push(declaration_t *declaration)
796 declaration->parent_scope = ¤t_function->scope;
797 stack_push(&label_stack, declaration);
801 * Push a declaration of the local label stack.
803 * @param declaration the declaration
805 static void local_label_push(declaration_t *declaration)
807 assert(declaration->parent_scope != NULL);
808 stack_push(&local_label_stack, declaration);
812 * pops symbols from the environment stack until @p new_top is the top element
814 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
816 stack_entry_t *stack = *stack_ptr;
817 size_t top = ARR_LEN(stack);
820 assert(new_top <= top);
824 for(i = top; i > new_top; --i) {
825 stack_entry_t *entry = &stack[i - 1];
827 declaration_t *old_declaration = entry->old_declaration;
828 symbol_t *symbol = entry->symbol;
829 namespace_t namespc = (namespace_t)entry->namespc;
831 /* replace/remove declaration */
832 declaration_t *declaration = symbol->declaration;
833 assert(declaration != NULL);
834 if (declaration->namespc == namespc) {
835 if (old_declaration == NULL) {
836 symbol->declaration = declaration->symbol_next;
838 symbol->declaration = old_declaration;
841 declaration_t *iter_last = declaration;
842 declaration_t *iter = declaration->symbol_next;
843 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
844 /* replace an entry? */
845 if (iter->namespc == namespc) {
846 assert(iter_last != NULL);
847 iter_last->symbol_next = old_declaration;
848 if (old_declaration != NULL) {
849 old_declaration->symbol_next = iter->symbol_next;
854 assert(iter != NULL);
858 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
862 * Pop all entries from the environment stack until the new_top
865 * @param new_top the new stack top
867 static void environment_pop_to(size_t new_top)
869 stack_pop_to(&environment_stack, new_top);
873 * Pop all entries from the global label stack until the new_top
876 * @param new_top the new stack top
878 static void label_pop_to(size_t new_top)
880 stack_pop_to(&label_stack, new_top);
884 * Pop all entries from the local label stack until the new_top
887 * @param new_top the new stack top
889 static void local_label_pop_to(size_t new_top)
891 stack_pop_to(&local_label_stack, new_top);
895 static int get_akind_rank(atomic_type_kind_t akind)
900 static int get_rank(const type_t *type)
902 assert(!is_typeref(type));
903 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
904 * and esp. footnote 108). However we can't fold constants (yet), so we
905 * can't decide whether unsigned int is possible, while int always works.
906 * (unsigned int would be preferable when possible... for stuff like
907 * struct { enum { ... } bla : 4; } ) */
908 if (type->kind == TYPE_ENUM)
909 return get_akind_rank(ATOMIC_TYPE_INT);
911 assert(type->kind == TYPE_ATOMIC);
912 return get_akind_rank(type->atomic.akind);
915 static type_t *promote_integer(type_t *type)
917 if (type->kind == TYPE_BITFIELD)
918 type = type->bitfield.base_type;
920 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
927 * Create a cast expression.
929 * @param expression the expression to cast
930 * @param dest_type the destination type
932 static expression_t *create_cast_expression(expression_t *expression,
935 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
937 cast->unary.value = expression;
938 cast->base.type = dest_type;
944 * Check if a given expression represents the 0 pointer constant.
946 static bool is_null_pointer_constant(const expression_t *expression)
948 /* skip void* cast */
949 if (expression->kind == EXPR_UNARY_CAST
950 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
951 expression = expression->unary.value;
954 /* TODO: not correct yet, should be any constant integer expression
955 * which evaluates to 0 */
956 if (expression->kind != EXPR_CONST)
959 type_t *const type = skip_typeref(expression->base.type);
960 if (!is_type_integer(type))
963 return expression->conste.v.int_value == 0;
967 * Create an implicit cast expression.
969 * @param expression the expression to cast
970 * @param dest_type the destination type
972 static expression_t *create_implicit_cast(expression_t *expression,
975 type_t *const source_type = expression->base.type;
977 if (source_type == dest_type)
980 return create_cast_expression(expression, dest_type);
983 typedef enum assign_error_t {
985 ASSIGN_ERROR_INCOMPATIBLE,
986 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
987 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
988 ASSIGN_WARNING_POINTER_FROM_INT,
989 ASSIGN_WARNING_INT_FROM_POINTER
992 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
993 const expression_t *const right,
995 const source_position_t *source_position)
997 type_t *const orig_type_right = right->base.type;
998 type_t *const type_left = skip_typeref(orig_type_left);
999 type_t *const type_right = skip_typeref(orig_type_right);
1002 case ASSIGN_SUCCESS:
1004 case ASSIGN_ERROR_INCOMPATIBLE:
1005 errorf(source_position,
1006 "destination type '%T' in %s is incompatible with type '%T'",
1007 orig_type_left, context, orig_type_right);
1010 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1011 type_t *points_to_left
1012 = skip_typeref(type_left->pointer.points_to);
1013 type_t *points_to_right
1014 = skip_typeref(type_right->pointer.points_to);
1016 /* the left type has all qualifiers from the right type */
1017 unsigned missing_qualifiers
1018 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1019 warningf(source_position,
1020 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1021 orig_type_left, context, orig_type_right, missing_qualifiers);
1025 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1026 warningf(source_position,
1027 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1028 orig_type_left, context, right, orig_type_right);
1031 case ASSIGN_WARNING_POINTER_FROM_INT:
1032 warningf(source_position,
1033 "%s makes pointer '%T' from integer '%T' without a cast",
1034 context, orig_type_left, orig_type_right);
1037 case ASSIGN_WARNING_INT_FROM_POINTER:
1038 warningf(source_position,
1039 "%s makes integer '%T' from pointer '%T' without a cast",
1040 context, orig_type_left, orig_type_right);
1044 panic("invalid error value");
1048 /** Implements the rules from § 6.5.16.1 */
1049 static assign_error_t semantic_assign(type_t *orig_type_left,
1050 const expression_t *const right)
1052 type_t *const orig_type_right = right->base.type;
1053 type_t *const type_left = skip_typeref(orig_type_left);
1054 type_t *const type_right = skip_typeref(orig_type_right);
1056 if (is_type_pointer(type_left)) {
1057 if (is_null_pointer_constant(right)) {
1058 return ASSIGN_SUCCESS;
1059 } else if (is_type_pointer(type_right)) {
1060 type_t *points_to_left
1061 = skip_typeref(type_left->pointer.points_to);
1062 type_t *points_to_right
1063 = skip_typeref(type_right->pointer.points_to);
1064 assign_error_t res = ASSIGN_SUCCESS;
1066 /* the left type has all qualifiers from the right type */
1067 unsigned missing_qualifiers
1068 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1069 if (missing_qualifiers != 0) {
1070 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1073 points_to_left = get_unqualified_type(points_to_left);
1074 points_to_right = get_unqualified_type(points_to_right);
1076 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
1077 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1081 if (!types_compatible(points_to_left, points_to_right)) {
1082 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1086 } else if (is_type_integer(type_right)) {
1087 return ASSIGN_WARNING_POINTER_FROM_INT;
1089 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1090 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1091 && is_type_pointer(type_right))) {
1092 return ASSIGN_SUCCESS;
1093 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1094 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1095 type_t *const unqual_type_left = get_unqualified_type(type_left);
1096 type_t *const unqual_type_right = get_unqualified_type(type_right);
1097 if (types_compatible(unqual_type_left, unqual_type_right)) {
1098 return ASSIGN_SUCCESS;
1100 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1101 return ASSIGN_WARNING_INT_FROM_POINTER;
1104 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1105 return ASSIGN_SUCCESS;
1107 return ASSIGN_ERROR_INCOMPATIBLE;
1110 static expression_t *parse_constant_expression(void)
1112 /* start parsing at precedence 7 (conditional expression) */
1113 expression_t *result = parse_sub_expression(7);
1115 if (!is_constant_expression(result)) {
1116 errorf(&result->base.source_position,
1117 "expression '%E' is not constant\n", result);
1123 static expression_t *parse_assignment_expression(void)
1125 /* start parsing at precedence 2 (assignment expression) */
1126 return parse_sub_expression(2);
1129 static type_t *make_global_typedef(const char *name, type_t *type)
1131 symbol_t *const symbol = symbol_table_insert(name);
1133 declaration_t *const declaration = allocate_declaration_zero();
1134 declaration->namespc = NAMESPACE_NORMAL;
1135 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
1136 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1137 declaration->type = type;
1138 declaration->symbol = symbol;
1139 declaration->source_position = builtin_source_position;
1140 declaration->implicit = true;
1142 record_declaration(declaration, false);
1144 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1145 typedef_type->typedeft.declaration = declaration;
1147 return typedef_type;
1150 static string_t parse_string_literals(void)
1152 assert(token.type == T_STRING_LITERAL);
1153 string_t result = token.v.string;
1157 while (token.type == T_STRING_LITERAL) {
1158 result = concat_strings(&result, &token.v.string);
1165 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1166 [GNU_AK_CONST] = "const",
1167 [GNU_AK_VOLATILE] = "volatile",
1168 [GNU_AK_CDECL] = "cdecl",
1169 [GNU_AK_STDCALL] = "stdcall",
1170 [GNU_AK_FASTCALL] = "fastcall",
1171 [GNU_AK_DEPRECATED] = "deprecated",
1172 [GNU_AK_NOINLINE] = "noinline",
1173 [GNU_AK_NORETURN] = "noreturn",
1174 [GNU_AK_NAKED] = "naked",
1175 [GNU_AK_PURE] = "pure",
1176 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1177 [GNU_AK_MALLOC] = "malloc",
1178 [GNU_AK_WEAK] = "weak",
1179 [GNU_AK_CONSTRUCTOR] = "constructor",
1180 [GNU_AK_DESTRUCTOR] = "destructor",
1181 [GNU_AK_NOTHROW] = "nothrow",
1182 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1183 [GNU_AK_COMMON] = "common",
1184 [GNU_AK_NOCOMMON] = "nocommon",
1185 [GNU_AK_PACKED] = "packed",
1186 [GNU_AK_SHARED] = "shared",
1187 [GNU_AK_NOTSHARED] = "notshared",
1188 [GNU_AK_USED] = "used",
1189 [GNU_AK_UNUSED] = "unused",
1190 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1191 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1192 [GNU_AK_LONGCALL] = "longcall",
1193 [GNU_AK_SHORTCALL] = "shortcall",
1194 [GNU_AK_LONG_CALL] = "long_call",
1195 [GNU_AK_SHORT_CALL] = "short_call",
1196 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1197 [GNU_AK_INTERRUPT] = "interrupt",
1198 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1199 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1200 [GNU_AK_NESTING] = "nesting",
1201 [GNU_AK_NEAR] = "near",
1202 [GNU_AK_FAR] = "far",
1203 [GNU_AK_SIGNAL] = "signal",
1204 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1205 [GNU_AK_TINY_DATA] = "tiny_data",
1206 [GNU_AK_SAVEALL] = "saveall",
1207 [GNU_AK_FLATTEN] = "flatten",
1208 [GNU_AK_SSEREGPARM] = "sseregparm",
1209 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1210 [GNU_AK_RETURN_TWICE] = "return_twice",
1211 [GNU_AK_MAY_ALIAS] = "may_alias",
1212 [GNU_AK_MS_STRUCT] = "ms_struct",
1213 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1214 [GNU_AK_DLLIMPORT] = "dllimport",
1215 [GNU_AK_DLLEXPORT] = "dllexport",
1216 [GNU_AK_ALIGNED] = "aligned",
1217 [GNU_AK_ALIAS] = "alias",
1218 [GNU_AK_SECTION] = "section",
1219 [GNU_AK_FORMAT] = "format",
1220 [GNU_AK_FORMAT_ARG] = "format_arg",
1221 [GNU_AK_WEAKREF] = "weakref",
1222 [GNU_AK_NONNULL] = "nonnull",
1223 [GNU_AK_TLS_MODEL] = "tls_model",
1224 [GNU_AK_VISIBILITY] = "visibility",
1225 [GNU_AK_REGPARM] = "regparm",
1226 [GNU_AK_MODE] = "mode",
1227 [GNU_AK_MODEL] = "model",
1228 [GNU_AK_TRAP_EXIT] = "trap_exit",
1229 [GNU_AK_SP_SWITCH] = "sp_switch",
1230 [GNU_AK_SENTINEL] = "sentinel"
1234 * compare two string, ignoring double underscores on the second.
1236 static int strcmp_underscore(const char *s1, const char *s2)
1238 if (s2[0] == '_' && s2[1] == '_') {
1239 size_t len2 = strlen(s2);
1240 size_t len1 = strlen(s1);
1241 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1242 return strncmp(s1, s2+2, len2-4);
1246 return strcmp(s1, s2);
1250 * Allocate a new gnu temporal attribute.
1252 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1254 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1255 attribute->kind = kind;
1256 attribute->next = NULL;
1257 attribute->invalid = false;
1258 attribute->have_arguments = false;
1264 * parse one constant expression argument.
1266 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1268 expression_t *expression;
1269 add_anchor_token(')');
1270 expression = parse_constant_expression();
1271 rem_anchor_token(')');
1273 attribute->u.argument = fold_constant(expression);
1276 attribute->invalid = true;
1280 * parse a list of constant expressions arguments.
1282 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1284 argument_list_t **list = &attribute->u.arguments;
1285 argument_list_t *entry;
1286 expression_t *expression;
1287 add_anchor_token(')');
1288 add_anchor_token(',');
1290 expression = parse_constant_expression();
1291 entry = obstack_alloc(&temp_obst, sizeof(entry));
1292 entry->argument = fold_constant(expression);
1295 list = &entry->next;
1296 if (token.type != ',')
1300 rem_anchor_token(',');
1301 rem_anchor_token(')');
1305 attribute->invalid = true;
1309 * parse one string literal argument.
1311 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1314 add_anchor_token('(');
1315 if (token.type != T_STRING_LITERAL) {
1316 parse_error_expected("while parsing attribute directive",
1317 T_STRING_LITERAL, NULL);
1320 *string = parse_string_literals();
1321 rem_anchor_token('(');
1325 attribute->invalid = true;
1329 * parse one tls model.
1331 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1333 static const char *const tls_models[] = {
1339 string_t string = { NULL, 0 };
1340 parse_gnu_attribute_string_arg(attribute, &string);
1341 if (string.begin != NULL) {
1342 for(size_t i = 0; i < 4; ++i) {
1343 if (strcmp(tls_models[i], string.begin) == 0) {
1344 attribute->u.value = i;
1348 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1350 attribute->invalid = true;
1354 * parse one tls model.
1356 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1358 static const char *const visibilities[] = {
1364 string_t string = { NULL, 0 };
1365 parse_gnu_attribute_string_arg(attribute, &string);
1366 if (string.begin != NULL) {
1367 for(size_t i = 0; i < 4; ++i) {
1368 if (strcmp(visibilities[i], string.begin) == 0) {
1369 attribute->u.value = i;
1373 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1375 attribute->invalid = true;
1379 * parse one (code) model.
1381 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1383 static const char *const visibilities[] = {
1388 string_t string = { NULL, 0 };
1389 parse_gnu_attribute_string_arg(attribute, &string);
1390 if (string.begin != NULL) {
1391 for(int i = 0; i < 3; ++i) {
1392 if (strcmp(visibilities[i], string.begin) == 0) {
1393 attribute->u.value = i;
1397 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1399 attribute->invalid = true;
1402 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1404 /* TODO: find out what is allowed here... */
1406 /* at least: byte, word, pointer, list of machine modes
1407 * __XXX___ is interpreted as XXX */
1408 add_anchor_token(')');
1410 if (token.type != T_IDENTIFIER) {
1411 expect(T_IDENTIFIER);
1414 /* This isn't really correct, the backend should provide a list of machine
1415 * specific modes (according to gcc philosophy that is...) */
1416 const char *symbol_str = token.v.symbol->string;
1417 if (strcmp_underscore("QI", symbol_str) == 0 ||
1418 strcmp_underscore("byte", symbol_str) == 0) {
1419 attribute->u.akind = ATOMIC_TYPE_CHAR;
1420 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1421 attribute->u.akind = ATOMIC_TYPE_SHORT;
1422 } else if (strcmp_underscore("SI", symbol_str) == 0
1423 || strcmp_underscore("word", symbol_str) == 0
1424 || strcmp_underscore("pointer", symbol_str) == 0) {
1425 attribute->u.akind = ATOMIC_TYPE_INT;
1426 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1427 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1429 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1430 attribute->invalid = true;
1434 rem_anchor_token(')');
1438 attribute->invalid = true;
1442 * parse one interrupt argument.
1444 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1446 static const char *const interrupts[] = {
1453 string_t string = { NULL, 0 };
1454 parse_gnu_attribute_string_arg(attribute, &string);
1455 if (string.begin != NULL) {
1456 for(size_t i = 0; i < 5; ++i) {
1457 if (strcmp(interrupts[i], string.begin) == 0) {
1458 attribute->u.value = i;
1462 errorf(HERE, "'%s' is not an interrupt", string.begin);
1464 attribute->invalid = true;
1468 * parse ( identifier, const expression, const expression )
1470 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1472 static const char *const format_names[] = {
1480 if (token.type != T_IDENTIFIER) {
1481 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1484 const char *name = token.v.symbol->string;
1485 for(i = 0; i < 4; ++i) {
1486 if (strcmp_underscore(format_names[i], name) == 0)
1490 if (warning.attribute)
1491 warningf(HERE, "'%s' is an unrecognized format function type", name);
1496 add_anchor_token(')');
1497 add_anchor_token(',');
1498 parse_constant_expression();
1499 rem_anchor_token(',');
1500 rem_anchor_token('(');
1503 add_anchor_token(')');
1504 parse_constant_expression();
1505 rem_anchor_token('(');
1509 attribute->u.value = true;
1512 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1514 if (!attribute->have_arguments)
1517 /* should have no arguments */
1518 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1519 eat_until_matching_token('(');
1520 /* we have already consumed '(', so we stop before ')', eat it */
1522 attribute->invalid = true;
1526 * Parse one GNU attribute.
1528 * Note that attribute names can be specified WITH or WITHOUT
1529 * double underscores, ie const or __const__.
1531 * The following attributes are parsed without arguments
1556 * no_instrument_function
1557 * warn_unused_result
1574 * externally_visible
1582 * The following attributes are parsed with arguments
1583 * aligned( const expression )
1584 * alias( string literal )
1585 * section( string literal )
1586 * format( identifier, const expression, const expression )
1587 * format_arg( const expression )
1588 * tls_model( string literal )
1589 * visibility( string literal )
1590 * regparm( const expression )
1591 * model( string leteral )
1592 * trap_exit( const expression )
1593 * sp_switch( string literal )
1595 * The following attributes might have arguments
1596 * weak_ref( string literal )
1597 * non_null( const expression // ',' )
1598 * interrupt( string literal )
1599 * sentinel( constant expression )
1601 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1603 gnu_attribute_t *head = *attributes;
1604 gnu_attribute_t *last = *attributes;
1605 decl_modifiers_t modifiers = 0;
1606 gnu_attribute_t *attribute;
1608 eat(T___attribute__);
1612 if (token.type != ')') {
1613 /* find the end of the list */
1615 while (last->next != NULL)
1619 /* non-empty attribute list */
1622 if (token.type == T_const) {
1624 } else if (token.type == T_volatile) {
1626 } else if (token.type == T_cdecl) {
1627 /* __attribute__((cdecl)), WITH ms mode */
1629 } else if (token.type == T_IDENTIFIER) {
1630 const symbol_t *sym = token.v.symbol;
1633 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1640 for(i = 0; i < GNU_AK_LAST; ++i) {
1641 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1644 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1647 if (kind == GNU_AK_LAST) {
1648 if (warning.attribute)
1649 warningf(HERE, "'%s' attribute directive ignored", name);
1651 /* skip possible arguments */
1652 if (token.type == '(') {
1653 eat_until_matching_token(')');
1656 /* check for arguments */
1657 attribute = allocate_gnu_attribute(kind);
1658 if (token.type == '(') {
1660 if (token.type == ')') {
1661 /* empty args are allowed */
1664 attribute->have_arguments = true;
1669 case GNU_AK_VOLATILE:
1674 case GNU_AK_NOCOMMON:
1676 case GNU_AK_NOTSHARED:
1677 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1678 case GNU_AK_WARN_UNUSED_RESULT:
1679 case GNU_AK_LONGCALL:
1680 case GNU_AK_SHORTCALL:
1681 case GNU_AK_LONG_CALL:
1682 case GNU_AK_SHORT_CALL:
1683 case GNU_AK_FUNCTION_VECTOR:
1684 case GNU_AK_INTERRUPT_HANDLER:
1685 case GNU_AK_NMI_HANDLER:
1686 case GNU_AK_NESTING:
1690 case GNU_AK_EIGTHBIT_DATA:
1691 case GNU_AK_TINY_DATA:
1692 case GNU_AK_SAVEALL:
1693 case GNU_AK_FLATTEN:
1694 case GNU_AK_SSEREGPARM:
1695 case GNU_AK_EXTERNALLY_VISIBLE:
1696 case GNU_AK_RETURN_TWICE:
1697 case GNU_AK_MAY_ALIAS:
1698 case GNU_AK_MS_STRUCT:
1699 case GNU_AK_GCC_STRUCT:
1702 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1703 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1704 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1705 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1706 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1707 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1708 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1709 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1710 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1711 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1712 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1713 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1714 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1715 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1716 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1717 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1718 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1720 case GNU_AK_ALIGNED:
1721 /* __align__ may be used without an argument */
1722 if (attribute->have_arguments) {
1723 parse_gnu_attribute_const_arg(attribute);
1727 case GNU_AK_FORMAT_ARG:
1728 case GNU_AK_REGPARM:
1729 case GNU_AK_TRAP_EXIT:
1730 if (!attribute->have_arguments) {
1731 /* should have arguments */
1732 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1733 attribute->invalid = true;
1735 parse_gnu_attribute_const_arg(attribute);
1738 case GNU_AK_SECTION:
1739 case GNU_AK_SP_SWITCH:
1740 if (!attribute->have_arguments) {
1741 /* should have arguments */
1742 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1743 attribute->invalid = true;
1745 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1748 if (!attribute->have_arguments) {
1749 /* should have arguments */
1750 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1751 attribute->invalid = true;
1753 parse_gnu_attribute_format_args(attribute);
1755 case GNU_AK_WEAKREF:
1756 /* may have one string argument */
1757 if (attribute->have_arguments)
1758 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1760 case GNU_AK_NONNULL:
1761 if (attribute->have_arguments)
1762 parse_gnu_attribute_const_arg_list(attribute);
1764 case GNU_AK_TLS_MODEL:
1765 if (!attribute->have_arguments) {
1766 /* should have arguments */
1767 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1769 parse_gnu_attribute_tls_model_arg(attribute);
1771 case GNU_AK_VISIBILITY:
1772 if (!attribute->have_arguments) {
1773 /* should have arguments */
1774 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1776 parse_gnu_attribute_visibility_arg(attribute);
1779 if (!attribute->have_arguments) {
1780 /* should have arguments */
1781 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1783 parse_gnu_attribute_model_arg(attribute);
1787 if (!attribute->have_arguments) {
1788 /* should have arguments */
1789 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1791 parse_gnu_attribute_mode_arg(attribute);
1794 case GNU_AK_INTERRUPT:
1795 /* may have one string argument */
1796 if (attribute->have_arguments)
1797 parse_gnu_attribute_interrupt_arg(attribute);
1799 case GNU_AK_SENTINEL:
1800 /* may have one string argument */
1801 if (attribute->have_arguments)
1802 parse_gnu_attribute_const_arg(attribute);
1805 /* already handled */
1809 check_no_argument(attribute, name);
1812 if (attribute != NULL) {
1814 last->next = attribute;
1817 head = last = attribute;
1821 if (token.type != ',')
1835 * Parse GNU attributes.
1837 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1839 decl_modifiers_t modifiers = 0;
1842 switch(token.type) {
1843 case T___attribute__:
1844 modifiers |= parse_gnu_attribute(attributes);
1850 if (token.type != T_STRING_LITERAL) {
1851 parse_error_expected("while parsing assembler attribute",
1852 T_STRING_LITERAL, NULL);
1853 eat_until_matching_token('(');
1856 parse_string_literals();
1861 case T_cdecl: modifiers |= DM_CDECL; break;
1862 case T__fastcall: modifiers |= DM_FASTCALL; break;
1863 case T__stdcall: modifiers |= DM_STDCALL; break;
1866 /* TODO record modifier */
1867 warningf(HERE, "Ignoring declaration modifier %K", &token);
1871 default: return modifiers;
1878 static designator_t *parse_designation(void)
1880 designator_t *result = NULL;
1881 designator_t *last = NULL;
1884 designator_t *designator;
1885 switch(token.type) {
1887 designator = allocate_ast_zero(sizeof(designator[0]));
1888 designator->source_position = token.source_position;
1890 add_anchor_token(']');
1891 designator->array_index = parse_constant_expression();
1892 rem_anchor_token(']');
1896 designator = allocate_ast_zero(sizeof(designator[0]));
1897 designator->source_position = token.source_position;
1899 if (token.type != T_IDENTIFIER) {
1900 parse_error_expected("while parsing designator",
1901 T_IDENTIFIER, NULL);
1904 designator->symbol = token.v.symbol;
1912 assert(designator != NULL);
1914 last->next = designator;
1916 result = designator;
1924 static initializer_t *initializer_from_string(array_type_t *type,
1925 const string_t *const string)
1927 /* TODO: check len vs. size of array type */
1930 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1931 initializer->string.string = *string;
1936 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1937 wide_string_t *const string)
1939 /* TODO: check len vs. size of array type */
1942 initializer_t *const initializer =
1943 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1944 initializer->wide_string.string = *string;
1950 * Build an initializer from a given expression.
1952 static initializer_t *initializer_from_expression(type_t *orig_type,
1953 expression_t *expression)
1955 /* TODO check that expression is a constant expression */
1957 /* § 6.7.8.14/15 char array may be initialized by string literals */
1958 type_t *type = skip_typeref(orig_type);
1959 type_t *expr_type_orig = expression->base.type;
1960 type_t *expr_type = skip_typeref(expr_type_orig);
1961 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1962 array_type_t *const array_type = &type->array;
1963 type_t *const element_type = skip_typeref(array_type->element_type);
1965 if (element_type->kind == TYPE_ATOMIC) {
1966 atomic_type_kind_t akind = element_type->atomic.akind;
1967 switch (expression->kind) {
1968 case EXPR_STRING_LITERAL:
1969 if (akind == ATOMIC_TYPE_CHAR
1970 || akind == ATOMIC_TYPE_SCHAR
1971 || akind == ATOMIC_TYPE_UCHAR) {
1972 return initializer_from_string(array_type,
1973 &expression->string.value);
1976 case EXPR_WIDE_STRING_LITERAL: {
1977 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1978 if (get_unqualified_type(element_type) == bare_wchar_type) {
1979 return initializer_from_wide_string(array_type,
1980 &expression->wide_string.value);
1990 assign_error_t error = semantic_assign(type, expression);
1991 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1993 report_assign_error(error, type, expression, "initializer",
1994 &expression->base.source_position);
1996 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1997 result->value.value = create_implicit_cast(expression, type);
2003 * Checks if a given expression can be used as an constant initializer.
2005 static bool is_initializer_constant(const expression_t *expression)
2007 return is_constant_expression(expression)
2008 || is_address_constant(expression);
2012 * Parses an scalar initializer.
2014 * § 6.7.8.11; eat {} without warning
2016 static initializer_t *parse_scalar_initializer(type_t *type,
2017 bool must_be_constant)
2019 /* there might be extra {} hierarchies */
2021 if (token.type == '{') {
2022 warningf(HERE, "extra curly braces around scalar initializer");
2026 } while (token.type == '{');
2029 expression_t *expression = parse_assignment_expression();
2030 if (must_be_constant && !is_initializer_constant(expression)) {
2031 errorf(&expression->base.source_position,
2032 "Initialisation expression '%E' is not constant\n",
2036 initializer_t *initializer = initializer_from_expression(type, expression);
2038 if (initializer == NULL) {
2039 errorf(&expression->base.source_position,
2040 "expression '%E' (type '%T') doesn't match expected type '%T'",
2041 expression, expression->base.type, type);
2046 bool additional_warning_displayed = false;
2047 while (braces > 0) {
2048 if (token.type == ',') {
2051 if (token.type != '}') {
2052 if (!additional_warning_displayed) {
2053 warningf(HERE, "additional elements in scalar initializer");
2054 additional_warning_displayed = true;
2065 * An entry in the type path.
2067 typedef struct type_path_entry_t type_path_entry_t;
2068 struct type_path_entry_t {
2069 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2071 size_t index; /**< For array types: the current index. */
2072 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2077 * A type path expression a position inside compound or array types.
2079 typedef struct type_path_t type_path_t;
2080 struct type_path_t {
2081 type_path_entry_t *path; /**< An flexible array containing the current path. */
2082 type_t *top_type; /**< type of the element the path points */
2083 size_t max_index; /**< largest index in outermost array */
2087 * Prints a type path for debugging.
2089 static __attribute__((unused)) void debug_print_type_path(
2090 const type_path_t *path)
2092 size_t len = ARR_LEN(path->path);
2094 for(size_t i = 0; i < len; ++i) {
2095 const type_path_entry_t *entry = & path->path[i];
2097 type_t *type = skip_typeref(entry->type);
2098 if (is_type_compound(type)) {
2099 /* in gcc mode structs can have no members */
2100 if (entry->v.compound_entry == NULL) {
2104 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2105 } else if (is_type_array(type)) {
2106 fprintf(stderr, "[%zu]", entry->v.index);
2108 fprintf(stderr, "-INVALID-");
2111 if (path->top_type != NULL) {
2112 fprintf(stderr, " (");
2113 print_type(path->top_type);
2114 fprintf(stderr, ")");
2119 * Return the top type path entry, ie. in a path
2120 * (type).a.b returns the b.
2122 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2124 size_t len = ARR_LEN(path->path);
2126 return &path->path[len-1];
2130 * Enlarge the type path by an (empty) element.
2132 static type_path_entry_t *append_to_type_path(type_path_t *path)
2134 size_t len = ARR_LEN(path->path);
2135 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2137 type_path_entry_t *result = & path->path[len];
2138 memset(result, 0, sizeof(result[0]));
2143 * Descending into a sub-type. Enter the scope of the current
2146 static void descend_into_subtype(type_path_t *path)
2148 type_t *orig_top_type = path->top_type;
2149 type_t *top_type = skip_typeref(orig_top_type);
2151 type_path_entry_t *top = append_to_type_path(path);
2152 top->type = top_type;
2154 if (is_type_compound(top_type)) {
2155 declaration_t *declaration = top_type->compound.declaration;
2156 declaration_t *entry = declaration->scope.declarations;
2157 top->v.compound_entry = entry;
2159 if (entry != NULL) {
2160 path->top_type = entry->type;
2162 path->top_type = NULL;
2164 } else if (is_type_array(top_type)) {
2166 path->top_type = top_type->array.element_type;
2168 assert(!is_type_valid(top_type));
2173 * Pop an entry from the given type path, ie. returning from
2174 * (type).a.b to (type).a
2176 static void ascend_from_subtype(type_path_t *path)
2178 type_path_entry_t *top = get_type_path_top(path);
2180 path->top_type = top->type;
2182 size_t len = ARR_LEN(path->path);
2183 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2187 * Pop entries from the given type path until the given
2188 * path level is reached.
2190 static void ascend_to(type_path_t *path, size_t top_path_level)
2192 size_t len = ARR_LEN(path->path);
2194 while (len > top_path_level) {
2195 ascend_from_subtype(path);
2196 len = ARR_LEN(path->path);
2200 static bool walk_designator(type_path_t *path, const designator_t *designator,
2201 bool used_in_offsetof)
2203 for( ; designator != NULL; designator = designator->next) {
2204 type_path_entry_t *top = get_type_path_top(path);
2205 type_t *orig_type = top->type;
2207 type_t *type = skip_typeref(orig_type);
2209 if (designator->symbol != NULL) {
2210 symbol_t *symbol = designator->symbol;
2211 if (!is_type_compound(type)) {
2212 if (is_type_valid(type)) {
2213 errorf(&designator->source_position,
2214 "'.%Y' designator used for non-compound type '%T'",
2220 declaration_t *declaration = type->compound.declaration;
2221 declaration_t *iter = declaration->scope.declarations;
2222 for( ; iter != NULL; iter = iter->next) {
2223 if (iter->symbol == symbol) {
2228 errorf(&designator->source_position,
2229 "'%T' has no member named '%Y'", orig_type, symbol);
2232 if (used_in_offsetof) {
2233 type_t *real_type = skip_typeref(iter->type);
2234 if (real_type->kind == TYPE_BITFIELD) {
2235 errorf(&designator->source_position,
2236 "offsetof designator '%Y' may not specify bitfield",
2242 top->type = orig_type;
2243 top->v.compound_entry = iter;
2244 orig_type = iter->type;
2246 expression_t *array_index = designator->array_index;
2247 assert(designator->array_index != NULL);
2249 if (!is_type_array(type)) {
2250 if (is_type_valid(type)) {
2251 errorf(&designator->source_position,
2252 "[%E] designator used for non-array type '%T'",
2253 array_index, orig_type);
2257 if (!is_type_valid(array_index->base.type)) {
2261 long index = fold_constant(array_index);
2262 if (!used_in_offsetof) {
2264 errorf(&designator->source_position,
2265 "array index [%E] must be positive", array_index);
2268 if (type->array.size_constant == true) {
2269 long array_size = type->array.size;
2270 if (index >= array_size) {
2271 errorf(&designator->source_position,
2272 "designator [%E] (%d) exceeds array size %d",
2273 array_index, index, array_size);
2279 top->type = orig_type;
2280 top->v.index = (size_t) index;
2281 orig_type = type->array.element_type;
2283 path->top_type = orig_type;
2285 if (designator->next != NULL) {
2286 descend_into_subtype(path);
2295 static void advance_current_object(type_path_t *path, size_t top_path_level)
2297 type_path_entry_t *top = get_type_path_top(path);
2299 type_t *type = skip_typeref(top->type);
2300 if (is_type_union(type)) {
2301 /* in unions only the first element is initialized */
2302 top->v.compound_entry = NULL;
2303 } else if (is_type_struct(type)) {
2304 declaration_t *entry = top->v.compound_entry;
2306 entry = entry->next;
2307 top->v.compound_entry = entry;
2308 if (entry != NULL) {
2309 path->top_type = entry->type;
2313 assert(is_type_array(type));
2317 if (!type->array.size_constant || top->v.index < type->array.size) {
2322 /* we're past the last member of the current sub-aggregate, try if we
2323 * can ascend in the type hierarchy and continue with another subobject */
2324 size_t len = ARR_LEN(path->path);
2326 if (len > top_path_level) {
2327 ascend_from_subtype(path);
2328 advance_current_object(path, top_path_level);
2330 path->top_type = NULL;
2335 * skip until token is found.
2337 static void skip_until(int type)
2339 while (token.type != type) {
2340 if (token.type == T_EOF)
2347 * skip any {...} blocks until a closing bracket is reached.
2349 static void skip_initializers(void)
2351 if (token.type == '{')
2354 while (token.type != '}') {
2355 if (token.type == T_EOF)
2357 if (token.type == '{') {
2365 static initializer_t *create_empty_initializer(void)
2367 static initializer_t empty_initializer
2368 = { .list = { { INITIALIZER_LIST }, 0 } };
2369 return &empty_initializer;
2373 * Parse a part of an initialiser for a struct or union,
2375 static initializer_t *parse_sub_initializer(type_path_t *path,
2376 type_t *outer_type, size_t top_path_level,
2377 parse_initializer_env_t *env)
2379 if (token.type == '}') {
2380 /* empty initializer */
2381 return create_empty_initializer();
2384 type_t *orig_type = path->top_type;
2385 type_t *type = NULL;
2387 if (orig_type == NULL) {
2388 /* We are initializing an empty compound. */
2390 type = skip_typeref(orig_type);
2392 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2393 * initializers in this case. */
2394 if (!is_type_valid(type)) {
2395 skip_initializers();
2396 return create_empty_initializer();
2400 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2403 designator_t *designator = NULL;
2404 if (token.type == '.' || token.type == '[') {
2405 designator = parse_designation();
2406 goto finish_designator;
2407 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2408 /* GNU-style designator ("identifier: value") */
2409 designator = allocate_ast_zero(sizeof(designator[0]));
2410 designator->source_position = token.source_position;
2411 designator->symbol = token.v.symbol;
2416 /* reset path to toplevel, evaluate designator from there */
2417 ascend_to(path, top_path_level);
2418 if (!walk_designator(path, designator, false)) {
2419 /* can't continue after designation error */
2423 initializer_t *designator_initializer
2424 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2425 designator_initializer->designator.designator = designator;
2426 ARR_APP1(initializer_t*, initializers, designator_initializer);
2428 orig_type = path->top_type;
2429 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2434 if (token.type == '{') {
2435 if (type != NULL && is_type_scalar(type)) {
2436 sub = parse_scalar_initializer(type, env->must_be_constant);
2440 if (env->declaration != NULL) {
2441 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2442 env->declaration->symbol);
2444 errorf(HERE, "extra brace group at end of initializer");
2447 descend_into_subtype(path);
2449 add_anchor_token('}');
2450 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2452 rem_anchor_token('}');
2455 ascend_from_subtype(path);
2459 goto error_parse_next;
2463 /* must be an expression */
2464 expression_t *expression = parse_assignment_expression();
2466 if (env->must_be_constant && !is_initializer_constant(expression)) {
2467 errorf(&expression->base.source_position,
2468 "Initialisation expression '%E' is not constant\n",
2473 /* we are already outside, ... */
2477 /* handle { "string" } special case */
2478 if ((expression->kind == EXPR_STRING_LITERAL
2479 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2480 && outer_type != NULL) {
2481 sub = initializer_from_expression(outer_type, expression);
2483 if (token.type == ',') {
2486 if (token.type != '}') {
2487 warningf(HERE, "excessive elements in initializer for type '%T'",
2490 /* TODO: eat , ... */
2495 /* descend into subtypes until expression matches type */
2497 orig_type = path->top_type;
2498 type = skip_typeref(orig_type);
2500 sub = initializer_from_expression(orig_type, expression);
2504 if (!is_type_valid(type)) {
2507 if (is_type_scalar(type)) {
2508 errorf(&expression->base.source_position,
2509 "expression '%E' doesn't match expected type '%T'",
2510 expression, orig_type);
2514 descend_into_subtype(path);
2518 /* update largest index of top array */
2519 const type_path_entry_t *first = &path->path[0];
2520 type_t *first_type = first->type;
2521 first_type = skip_typeref(first_type);
2522 if (is_type_array(first_type)) {
2523 size_t index = first->v.index;
2524 if (index > path->max_index)
2525 path->max_index = index;
2529 /* append to initializers list */
2530 ARR_APP1(initializer_t*, initializers, sub);
2533 if (env->declaration != NULL)
2534 warningf(HERE, "excess elements in struct initializer for '%Y'",
2535 env->declaration->symbol);
2537 warningf(HERE, "excess elements in struct initializer");
2541 if (token.type == '}') {
2545 if (token.type == '}') {
2550 /* advance to the next declaration if we are not at the end */
2551 advance_current_object(path, top_path_level);
2552 orig_type = path->top_type;
2553 if (orig_type != NULL)
2554 type = skip_typeref(orig_type);
2560 size_t len = ARR_LEN(initializers);
2561 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2562 initializer_t *result = allocate_ast_zero(size);
2563 result->kind = INITIALIZER_LIST;
2564 result->list.len = len;
2565 memcpy(&result->list.initializers, initializers,
2566 len * sizeof(initializers[0]));
2568 DEL_ARR_F(initializers);
2569 ascend_to(path, top_path_level+1);
2574 skip_initializers();
2575 DEL_ARR_F(initializers);
2576 ascend_to(path, top_path_level+1);
2581 * Parses an initializer. Parsers either a compound literal
2582 * (env->declaration == NULL) or an initializer of a declaration.
2584 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2586 type_t *type = skip_typeref(env->type);
2587 initializer_t *result = NULL;
2590 if (is_type_scalar(type)) {
2591 result = parse_scalar_initializer(type, env->must_be_constant);
2592 } else if (token.type == '{') {
2596 memset(&path, 0, sizeof(path));
2597 path.top_type = env->type;
2598 path.path = NEW_ARR_F(type_path_entry_t, 0);
2600 descend_into_subtype(&path);
2602 add_anchor_token('}');
2603 result = parse_sub_initializer(&path, env->type, 1, env);
2604 rem_anchor_token('}');
2606 max_index = path.max_index;
2607 DEL_ARR_F(path.path);
2611 /* parse_scalar_initializer() also works in this case: we simply
2612 * have an expression without {} around it */
2613 result = parse_scalar_initializer(type, env->must_be_constant);
2616 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2617 * the array type size */
2618 if (is_type_array(type) && type->array.size_expression == NULL
2619 && result != NULL) {
2621 switch (result->kind) {
2622 case INITIALIZER_LIST:
2623 size = max_index + 1;
2626 case INITIALIZER_STRING:
2627 size = result->string.string.size;
2630 case INITIALIZER_WIDE_STRING:
2631 size = result->wide_string.string.size;
2634 case INITIALIZER_DESIGNATOR:
2635 case INITIALIZER_VALUE:
2636 /* can happen for parse errors */
2641 internal_errorf(HERE, "invalid initializer type");
2644 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2645 cnst->base.type = type_size_t;
2646 cnst->conste.v.int_value = size;
2648 type_t *new_type = duplicate_type(type);
2650 new_type->array.size_expression = cnst;
2651 new_type->array.size_constant = true;
2652 new_type->array.size = size;
2653 env->type = new_type;
2661 static declaration_t *append_declaration(declaration_t *declaration);
2663 static declaration_t *parse_compound_type_specifier(bool is_struct)
2665 gnu_attribute_t *attributes = NULL;
2666 decl_modifiers_t modifiers = 0;
2673 symbol_t *symbol = NULL;
2674 declaration_t *declaration = NULL;
2676 if (token.type == T___attribute__) {
2677 modifiers |= parse_attributes(&attributes);
2680 if (token.type == T_IDENTIFIER) {
2681 symbol = token.v.symbol;
2684 namespace_t const namespc =
2685 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2686 declaration = get_declaration(symbol, namespc);
2687 if (declaration != NULL) {
2688 if (declaration->parent_scope != scope &&
2689 (token.type == '{' || token.type == ';')) {
2691 } else if (declaration->init.complete &&
2692 token.type == '{') {
2693 assert(symbol != NULL);
2694 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2695 is_struct ? "struct" : "union", symbol,
2696 &declaration->source_position);
2697 declaration->scope.declarations = NULL;
2700 } else if (token.type != '{') {
2702 parse_error_expected("while parsing struct type specifier",
2703 T_IDENTIFIER, '{', NULL);
2705 parse_error_expected("while parsing union type specifier",
2706 T_IDENTIFIER, '{', NULL);
2712 if (declaration == NULL) {
2713 declaration = allocate_declaration_zero();
2714 declaration->namespc =
2715 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2716 declaration->source_position = token.source_position;
2717 declaration->symbol = symbol;
2718 declaration->parent_scope = scope;
2719 if (symbol != NULL) {
2720 environment_push(declaration);
2722 append_declaration(declaration);
2725 if (token.type == '{') {
2726 declaration->init.complete = true;
2728 parse_compound_type_entries(declaration);
2729 modifiers |= parse_attributes(&attributes);
2732 declaration->modifiers |= modifiers;
2736 static void parse_enum_entries(type_t *const enum_type)
2740 if (token.type == '}') {
2742 errorf(HERE, "empty enum not allowed");
2746 add_anchor_token('}');
2748 if (token.type != T_IDENTIFIER) {
2749 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2751 rem_anchor_token('}');
2755 declaration_t *const entry = allocate_declaration_zero();
2756 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2757 entry->type = enum_type;
2758 entry->symbol = token.v.symbol;
2759 entry->source_position = token.source_position;
2762 if (token.type == '=') {
2764 expression_t *value = parse_constant_expression();
2766 value = create_implicit_cast(value, enum_type);
2767 entry->init.enum_value = value;
2772 record_declaration(entry, false);
2774 if (token.type != ',')
2777 } while (token.type != '}');
2778 rem_anchor_token('}');
2786 static type_t *parse_enum_specifier(void)
2788 gnu_attribute_t *attributes = NULL;
2789 declaration_t *declaration;
2793 if (token.type == T_IDENTIFIER) {
2794 symbol = token.v.symbol;
2797 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2798 } else if (token.type != '{') {
2799 parse_error_expected("while parsing enum type specifier",
2800 T_IDENTIFIER, '{', NULL);
2807 if (declaration == NULL) {
2808 declaration = allocate_declaration_zero();
2809 declaration->namespc = NAMESPACE_ENUM;
2810 declaration->source_position = token.source_position;
2811 declaration->symbol = symbol;
2812 declaration->parent_scope = scope;
2815 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2816 type->enumt.declaration = declaration;
2818 if (token.type == '{') {
2819 if (declaration->init.complete) {
2820 errorf(HERE, "multiple definitions of enum %Y", symbol);
2822 if (symbol != NULL) {
2823 environment_push(declaration);
2825 append_declaration(declaration);
2826 declaration->init.complete = true;
2828 parse_enum_entries(type);
2829 parse_attributes(&attributes);
2836 * if a symbol is a typedef to another type, return true
2838 static bool is_typedef_symbol(symbol_t *symbol)
2840 const declaration_t *const declaration =
2841 get_declaration(symbol, NAMESPACE_NORMAL);
2843 declaration != NULL &&
2844 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2847 static type_t *parse_typeof(void)
2854 add_anchor_token(')');
2856 expression_t *expression = NULL;
2859 switch(token.type) {
2860 case T___extension__:
2861 /* This can be a prefix to a typename or an expression. We simply eat
2865 } while (token.type == T___extension__);
2869 if (is_typedef_symbol(token.v.symbol)) {
2870 type = parse_typename();
2872 expression = parse_expression();
2873 type = expression->base.type;
2878 type = parse_typename();
2882 expression = parse_expression();
2883 type = expression->base.type;
2887 rem_anchor_token(')');
2890 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2891 typeof_type->typeoft.expression = expression;
2892 typeof_type->typeoft.typeof_type = type;
2899 typedef enum specifiers_t {
2900 SPECIFIER_SIGNED = 1 << 0,
2901 SPECIFIER_UNSIGNED = 1 << 1,
2902 SPECIFIER_LONG = 1 << 2,
2903 SPECIFIER_INT = 1 << 3,
2904 SPECIFIER_DOUBLE = 1 << 4,
2905 SPECIFIER_CHAR = 1 << 5,
2906 SPECIFIER_SHORT = 1 << 6,
2907 SPECIFIER_LONG_LONG = 1 << 7,
2908 SPECIFIER_FLOAT = 1 << 8,
2909 SPECIFIER_BOOL = 1 << 9,
2910 SPECIFIER_VOID = 1 << 10,
2911 SPECIFIER_INT8 = 1 << 11,
2912 SPECIFIER_INT16 = 1 << 12,
2913 SPECIFIER_INT32 = 1 << 13,
2914 SPECIFIER_INT64 = 1 << 14,
2915 SPECIFIER_INT128 = 1 << 15,
2916 SPECIFIER_COMPLEX = 1 << 16,
2917 SPECIFIER_IMAGINARY = 1 << 17,
2920 static type_t *create_builtin_type(symbol_t *const symbol,
2921 type_t *const real_type)
2923 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2924 type->builtin.symbol = symbol;
2925 type->builtin.real_type = real_type;
2927 type_t *result = typehash_insert(type);
2928 if (type != result) {
2935 static type_t *get_typedef_type(symbol_t *symbol)
2937 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2938 if (declaration == NULL ||
2939 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2942 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2943 type->typedeft.declaration = declaration;
2949 * check for the allowed MS alignment values.
2951 static bool check_alignment_value(long long intvalue)
2953 if (intvalue < 1 || intvalue > 8192) {
2954 errorf(HERE, "illegal alignment value");
2957 unsigned v = (unsigned)intvalue;
2958 for(unsigned i = 1; i <= 8192; i += i) {
2962 errorf(HERE, "alignment must be power of two");
2966 #define DET_MOD(name, tag) do { \
2967 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2968 *modifiers |= tag; \
2971 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2973 decl_modifiers_t *modifiers = &specifiers->modifiers;
2976 if (token.type == T_restrict) {
2978 DET_MOD(restrict, DM_RESTRICT);
2980 } else if (token.type != T_IDENTIFIER)
2982 symbol_t *symbol = token.v.symbol;
2983 if (symbol == sym_align) {
2986 if (token.type != T_INTEGER)
2988 if (check_alignment_value(token.v.intvalue)) {
2989 if (specifiers->alignment != 0)
2990 warningf(HERE, "align used more than once");
2991 specifiers->alignment = (unsigned char)token.v.intvalue;
2995 } else if (symbol == sym_allocate) {
2998 if (token.type != T_IDENTIFIER)
3000 (void)token.v.symbol;
3002 } else if (symbol == sym_dllimport) {
3004 DET_MOD(dllimport, DM_DLLIMPORT);
3005 } else if (symbol == sym_dllexport) {
3007 DET_MOD(dllexport, DM_DLLEXPORT);
3008 } else if (symbol == sym_thread) {
3010 DET_MOD(thread, DM_THREAD);
3011 } else if (symbol == sym_naked) {
3013 DET_MOD(naked, DM_NAKED);
3014 } else if (symbol == sym_noinline) {
3016 DET_MOD(noinline, DM_NOINLINE);
3017 } else if (symbol == sym_noreturn) {
3019 DET_MOD(noreturn, DM_NORETURN);
3020 } else if (symbol == sym_nothrow) {
3022 DET_MOD(nothrow, DM_NOTHROW);
3023 } else if (symbol == sym_novtable) {
3025 DET_MOD(novtable, DM_NOVTABLE);
3026 } else if (symbol == sym_property) {
3030 bool is_get = false;
3031 if (token.type != T_IDENTIFIER)
3033 if (token.v.symbol == sym_get) {
3035 } else if (token.v.symbol == sym_put) {
3037 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3042 if (token.type != T_IDENTIFIER)
3045 if (specifiers->get_property_sym != NULL) {
3046 errorf(HERE, "get property name already specified");
3048 specifiers->get_property_sym = token.v.symbol;
3051 if (specifiers->put_property_sym != NULL) {
3052 errorf(HERE, "put property name already specified");
3054 specifiers->put_property_sym = token.v.symbol;
3058 if (token.type == ',') {
3065 } else if (symbol == sym_selectany) {
3067 DET_MOD(selectany, DM_SELECTANY);
3068 } else if (symbol == sym_uuid) {
3071 if (token.type != T_STRING_LITERAL)
3075 } else if (symbol == sym_deprecated) {
3077 if (specifiers->deprecated != 0)
3078 warningf(HERE, "deprecated used more than once");
3079 specifiers->deprecated = 1;
3080 if (token.type == '(') {
3082 if (token.type == T_STRING_LITERAL) {
3083 specifiers->deprecated_string = token.v.string.begin;
3086 errorf(HERE, "string literal expected");
3090 } else if (symbol == sym_noalias) {
3092 DET_MOD(noalias, DM_NOALIAS);
3094 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3096 if (token.type == '(')
3100 if (token.type == ',')
3107 static declaration_t *create_error_declaration(symbol_t *symbol, storage_class_tag_t storage_class)
3109 declaration_t *const decl = allocate_declaration_zero();
3110 decl->source_position = *HERE;
3111 decl->declared_storage_class = storage_class;
3112 decl->storage_class =
3113 storage_class != STORAGE_CLASS_NONE || scope == global_scope ?
3114 storage_class : STORAGE_CLASS_AUTO;
3115 decl->symbol = symbol;
3116 decl->implicit = true;
3117 record_declaration(decl, false);
3122 * Finish the construction of a struct type by calculating
3123 * its size, offsets, alignment.
3125 static void finish_struct_type(compound_type_t *type) {
3126 if (type->declaration == NULL)
3128 declaration_t *struct_decl = type->declaration;
3129 if (! struct_decl->init.complete)
3134 il_alignment_t alignment = 1;
3135 bool need_pad = false;
3137 declaration_t *entry = struct_decl->scope.declarations;
3138 for (; entry != NULL; entry = entry->next) {
3139 if (entry->namespc != NAMESPACE_NORMAL)
3142 type_t *m_type = skip_typeref(entry->type);
3143 if (! is_type_valid(m_type)) {
3144 /* simply ignore errors here */
3147 il_alignment_t m_alignment = m_type->base.alignment;
3148 if (m_alignment > alignment)
3149 alignment = m_alignment;
3151 offset = (size + m_alignment - 1) & -m_alignment;
3155 entry->offset = offset;
3156 size = offset + m_type->base.size;
3158 if (type->base.alignment != 0) {
3159 alignment = type->base.alignment;
3162 offset = (size + alignment - 1) & -alignment;
3166 if (warning.padded && need_pad) {
3167 warningf(&struct_decl->source_position,
3168 "'%#T' needs padding", type, struct_decl->symbol);
3170 if (warning.packed && !need_pad) {
3171 warningf(&struct_decl->source_position,
3172 "superfluous packed attribute on '%#T'",
3173 type, struct_decl->symbol);
3176 type->base.size = offset;
3177 type->base.alignment = alignment;
3181 * Finish the construction of an union type by calculating
3182 * its size and alignment.
3184 static void finish_union_type(compound_type_t *type) {
3185 if (type->declaration == NULL)
3187 declaration_t *union_decl = type->declaration;
3188 if (! union_decl->init.complete)
3192 il_alignment_t alignment = 1;
3194 declaration_t *entry = union_decl->scope.declarations;
3195 for (; entry != NULL; entry = entry->next) {
3196 if (entry->namespc != NAMESPACE_NORMAL)
3199 type_t *m_type = skip_typeref(entry->type);
3200 if (! is_type_valid(m_type))
3204 if (m_type->base.size > size)
3205 size = m_type->base.size;
3206 if (m_type->base.alignment > alignment)
3207 alignment = m_type->base.alignment;
3209 if (type->base.alignment != 0) {
3210 alignment = type->base.alignment;
3212 size = (size + alignment - 1) & -alignment;
3213 type->base.size = size;
3214 type->base.alignment = alignment;
3217 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3219 type_t *type = NULL;
3220 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3221 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3222 unsigned type_specifiers = 0;
3223 bool newtype = false;
3224 bool saw_error = false;
3226 specifiers->source_position = token.source_position;
3229 specifiers->modifiers
3230 |= parse_attributes(&specifiers->gnu_attributes);
3231 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3232 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3234 switch(token.type) {
3237 #define MATCH_STORAGE_CLASS(token, class) \
3239 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3240 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3242 specifiers->declared_storage_class = class; \
3246 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3247 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3248 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3249 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3250 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3255 add_anchor_token(')');
3256 parse_microsoft_extended_decl_modifier(specifiers);
3257 rem_anchor_token(')');
3262 switch (specifiers->declared_storage_class) {
3263 case STORAGE_CLASS_NONE:
3264 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3267 case STORAGE_CLASS_EXTERN:
3268 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3271 case STORAGE_CLASS_STATIC:
3272 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3276 errorf(HERE, "multiple storage classes in declaration specifiers");
3282 /* type qualifiers */
3283 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3285 qualifiers |= qualifier; \
3289 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3290 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3291 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3292 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3293 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3294 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3295 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3296 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3298 case T___extension__:
3303 /* type specifiers */
3304 #define MATCH_SPECIFIER(token, specifier, name) \
3307 if (type_specifiers & specifier) { \
3308 errorf(HERE, "multiple " name " type specifiers given"); \
3310 type_specifiers |= specifier; \
3314 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3315 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3316 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3317 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3318 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3319 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3320 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3321 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3322 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3323 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3324 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3325 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3326 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3327 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3328 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3329 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3331 case T__forceinline:
3332 /* only in microsoft mode */
3333 specifiers->modifiers |= DM_FORCEINLINE;
3338 specifiers->is_inline = true;
3343 if (type_specifiers & SPECIFIER_LONG_LONG) {
3344 errorf(HERE, "multiple type specifiers given");
3345 } else if (type_specifiers & SPECIFIER_LONG) {
3346 type_specifiers |= SPECIFIER_LONG_LONG;
3348 type_specifiers |= SPECIFIER_LONG;
3353 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3355 type->compound.declaration = parse_compound_type_specifier(true);
3356 finish_struct_type(&type->compound);
3360 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3361 type->compound.declaration = parse_compound_type_specifier(false);
3362 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3363 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3365 finish_union_type(&type->compound);
3368 type = parse_enum_specifier();
3371 type = parse_typeof();
3373 case T___builtin_va_list:
3374 type = duplicate_type(type_valist);
3378 case T_IDENTIFIER: {
3379 /* only parse identifier if we haven't found a type yet */
3380 if (type != NULL || type_specifiers != 0) {
3381 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3382 * declaration, so it doesn't generate errors about expecting '(' or
3384 switch (look_ahead(1)->type) {
3391 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3394 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3399 goto finish_specifiers;
3403 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3404 if (typedef_type == NULL) {
3405 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3406 * declaration, so it doesn't generate 'implicit int' followed by more
3407 * errors later on. */
3408 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3413 errorf(HERE, "%K does not name a type", &token);
3415 declaration_t *const decl =
3416 create_error_declaration(token.v.symbol, STORAGE_CLASS_TYPEDEF);
3418 type = allocate_type_zero(TYPE_TYPEDEF, HERE);
3419 type->typedeft.declaration = decl;
3423 if (la1_type == '*')
3424 goto finish_specifiers;
3429 goto finish_specifiers;
3434 type = typedef_type;
3438 /* function specifier */
3440 goto finish_specifiers;
3445 if (type == NULL || (saw_error && type_specifiers != 0)) {
3446 atomic_type_kind_t atomic_type;
3448 /* match valid basic types */
3449 switch(type_specifiers) {
3450 case SPECIFIER_VOID:
3451 atomic_type = ATOMIC_TYPE_VOID;
3453 case SPECIFIER_CHAR:
3454 atomic_type = ATOMIC_TYPE_CHAR;
3456 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3457 atomic_type = ATOMIC_TYPE_SCHAR;
3459 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3460 atomic_type = ATOMIC_TYPE_UCHAR;
3462 case SPECIFIER_SHORT:
3463 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3464 case SPECIFIER_SHORT | SPECIFIER_INT:
3465 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3466 atomic_type = ATOMIC_TYPE_SHORT;
3468 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3469 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3470 atomic_type = ATOMIC_TYPE_USHORT;
3473 case SPECIFIER_SIGNED:
3474 case SPECIFIER_SIGNED | SPECIFIER_INT:
3475 atomic_type = ATOMIC_TYPE_INT;
3477 case SPECIFIER_UNSIGNED:
3478 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3479 atomic_type = ATOMIC_TYPE_UINT;
3481 case SPECIFIER_LONG:
3482 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3483 case SPECIFIER_LONG | SPECIFIER_INT:
3484 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3485 atomic_type = ATOMIC_TYPE_LONG;
3487 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3488 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3489 atomic_type = ATOMIC_TYPE_ULONG;
3492 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3493 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3494 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3495 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3497 atomic_type = ATOMIC_TYPE_LONGLONG;
3498 goto warn_about_long_long;
3500 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3501 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3503 atomic_type = ATOMIC_TYPE_ULONGLONG;
3504 warn_about_long_long:
3505 if (warning.long_long) {
3506 warningf(&specifiers->source_position,
3507 "ISO C90 does not support 'long long'");
3511 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3512 atomic_type = unsigned_int8_type_kind;
3515 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3516 atomic_type = unsigned_int16_type_kind;
3519 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3520 atomic_type = unsigned_int32_type_kind;
3523 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3524 atomic_type = unsigned_int64_type_kind;
3527 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3528 atomic_type = unsigned_int128_type_kind;
3531 case SPECIFIER_INT8:
3532 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3533 atomic_type = int8_type_kind;
3536 case SPECIFIER_INT16:
3537 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3538 atomic_type = int16_type_kind;
3541 case SPECIFIER_INT32:
3542 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3543 atomic_type = int32_type_kind;
3546 case SPECIFIER_INT64:
3547 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3548 atomic_type = int64_type_kind;
3551 case SPECIFIER_INT128:
3552 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3553 atomic_type = int128_type_kind;
3556 case SPECIFIER_FLOAT:
3557 atomic_type = ATOMIC_TYPE_FLOAT;
3559 case SPECIFIER_DOUBLE:
3560 atomic_type = ATOMIC_TYPE_DOUBLE;
3562 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3563 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3565 case SPECIFIER_BOOL:
3566 atomic_type = ATOMIC_TYPE_BOOL;
3568 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3569 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3570 atomic_type = ATOMIC_TYPE_FLOAT;
3572 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3573 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3574 atomic_type = ATOMIC_TYPE_DOUBLE;
3576 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3577 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3578 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3581 /* invalid specifier combination, give an error message */
3582 if (type_specifiers == 0) {
3584 specifiers->type = type_error_type;
3589 if (warning.implicit_int) {
3590 warningf(HERE, "no type specifiers in declaration, using 'int'");
3592 atomic_type = ATOMIC_TYPE_INT;
3595 errorf(HERE, "no type specifiers given in declaration");
3597 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3598 (type_specifiers & SPECIFIER_UNSIGNED)) {
3599 errorf(HERE, "signed and unsigned specifiers given");
3600 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3601 errorf(HERE, "only integer types can be signed or unsigned");
3603 errorf(HERE, "multiple datatypes in declaration");
3605 atomic_type = ATOMIC_TYPE_INVALID;
3608 if (type_specifiers & SPECIFIER_COMPLEX &&
3609 atomic_type != ATOMIC_TYPE_INVALID) {
3610 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3611 type->complex.akind = atomic_type;
3612 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3613 atomic_type != ATOMIC_TYPE_INVALID) {
3614 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3615 type->imaginary.akind = atomic_type;
3617 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3618 type->atomic.akind = atomic_type;
3621 } else if (type_specifiers != 0) {
3622 errorf(HERE, "multiple datatypes in declaration");
3625 /* FIXME: check type qualifiers here */
3627 type->base.qualifiers = qualifiers;
3628 type->base.modifiers = modifiers;
3630 type_t *result = typehash_insert(type);
3631 if (newtype && result != type) {
3635 specifiers->type = result;
3640 static type_qualifiers_t parse_type_qualifiers(void)
3642 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3645 switch(token.type) {
3646 /* type qualifiers */
3647 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3648 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3649 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3650 /* microsoft extended type modifiers */
3651 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3652 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3653 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3654 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3655 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3663 static declaration_t *parse_identifier_list(void)
3665 declaration_t *declarations = NULL;
3666 declaration_t *last_declaration = NULL;
3668 declaration_t *const declaration = allocate_declaration_zero();
3669 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3670 declaration->source_position = token.source_position;
3671 declaration->symbol = token.v.symbol;
3674 if (last_declaration != NULL) {
3675 last_declaration->next = declaration;
3677 declarations = declaration;
3679 last_declaration = declaration;
3681 if (token.type != ',') {
3685 } while (token.type == T_IDENTIFIER);
3687 return declarations;
3690 static type_t *automatic_type_conversion(type_t *orig_type);
3692 static void semantic_parameter(declaration_t *declaration)
3694 /* TODO: improve error messages */
3695 source_position_t const* const pos = &declaration->source_position;
3697 switch (declaration->declared_storage_class) {
3698 case STORAGE_CLASS_TYPEDEF:
3699 errorf(pos, "typedef not allowed in parameter list");
3702 /* Allowed storage classes */
3703 case STORAGE_CLASS_NONE:
3704 case STORAGE_CLASS_REGISTER:
3708 errorf(pos, "parameter may only have none or register storage class");
3712 type_t *const orig_type = declaration->type;
3713 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3714 * sugar. Turn it into a pointer.
3715 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3716 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3718 type_t *const type = automatic_type_conversion(orig_type);
3719 declaration->type = type;
3721 if (is_type_incomplete(skip_typeref(type))) {
3722 errorf(pos, "parameter '%#T' is of incomplete type",
3723 orig_type, declaration->symbol);
3727 static declaration_t *parse_parameter(void)
3729 declaration_specifiers_t specifiers;
3730 memset(&specifiers, 0, sizeof(specifiers));
3732 parse_declaration_specifiers(&specifiers);
3734 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3739 static declaration_t *parse_parameters(function_type_t *type)
3741 declaration_t *declarations = NULL;
3744 add_anchor_token(')');
3745 int saved_comma_state = save_and_reset_anchor_state(',');
3747 if (token.type == T_IDENTIFIER &&
3748 !is_typedef_symbol(token.v.symbol)) {
3749 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3750 if (la1_type == ',' || la1_type == ')') {
3751 type->kr_style_parameters = true;
3752 declarations = parse_identifier_list();
3753 goto parameters_finished;
3757 if (token.type == ')') {
3758 type->unspecified_parameters = 1;
3759 goto parameters_finished;
3762 declaration_t *declaration;
3763 declaration_t *last_declaration = NULL;
3764 function_parameter_t *parameter;
3765 function_parameter_t *last_parameter = NULL;
3768 switch(token.type) {
3772 goto parameters_finished;
3775 case T___extension__:
3777 declaration = parse_parameter();
3779 /* func(void) is not a parameter */
3780 if (last_parameter == NULL
3781 && token.type == ')'
3782 && declaration->symbol == NULL
3783 && skip_typeref(declaration->type) == type_void) {
3784 goto parameters_finished;
3786 semantic_parameter(declaration);
3788 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3789 memset(parameter, 0, sizeof(parameter[0]));
3790 parameter->type = declaration->type;
3792 if (last_parameter != NULL) {
3793 last_declaration->next = declaration;
3794 last_parameter->next = parameter;
3796 type->parameters = parameter;
3797 declarations = declaration;
3799 last_parameter = parameter;
3800 last_declaration = declaration;
3804 goto parameters_finished;
3806 if (token.type != ',') {
3807 goto parameters_finished;
3813 parameters_finished:
3814 rem_anchor_token(')');
3817 restore_anchor_state(',', saved_comma_state);
3818 return declarations;
3821 restore_anchor_state(',', saved_comma_state);
3825 typedef enum construct_type_kind_t {
3830 } construct_type_kind_t;
3832 typedef struct construct_type_t construct_type_t;
3833 struct construct_type_t {
3834 construct_type_kind_t kind;
3835 construct_type_t *next;
3838 typedef struct parsed_pointer_t parsed_pointer_t;
3839 struct parsed_pointer_t {
3840 construct_type_t construct_type;
3841 type_qualifiers_t type_qualifiers;
3844 typedef struct construct_function_type_t construct_function_type_t;
3845 struct construct_function_type_t {
3846 construct_type_t construct_type;
3847 type_t *function_type;
3850 typedef struct parsed_array_t parsed_array_t;
3851 struct parsed_array_t {
3852 construct_type_t construct_type;
3853 type_qualifiers_t type_qualifiers;
3859 typedef struct construct_base_type_t construct_base_type_t;
3860 struct construct_base_type_t {
3861 construct_type_t construct_type;
3865 static construct_type_t *parse_pointer_declarator(void)
3869 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3870 memset(pointer, 0, sizeof(pointer[0]));
3871 pointer->construct_type.kind = CONSTRUCT_POINTER;
3872 pointer->type_qualifiers = parse_type_qualifiers();
3874 return (construct_type_t*) pointer;
3877 static construct_type_t *parse_array_declarator(void)
3880 add_anchor_token(']');
3882 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3883 memset(array, 0, sizeof(array[0]));
3884 array->construct_type.kind = CONSTRUCT_ARRAY;
3886 if (token.type == T_static) {
3887 array->is_static = true;
3891 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3892 if (type_qualifiers != 0) {
3893 if (token.type == T_static) {
3894 array->is_static = true;
3898 array->type_qualifiers = type_qualifiers;
3900 if (token.type == '*' && look_ahead(1)->type == ']') {
3901 array->is_variable = true;
3903 } else if (token.type != ']') {
3904 array->size = parse_assignment_expression();
3907 rem_anchor_token(']');
3910 return (construct_type_t*) array;
3915 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3918 if (declaration != NULL) {
3919 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3921 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3923 if (mask & (mask-1)) {
3924 const char *first = NULL, *second = NULL;
3926 /* more than one calling convention set */
3927 if (declaration->modifiers & DM_CDECL) {
3928 if (first == NULL) first = "cdecl";
3929 else if (second == NULL) second = "cdecl";
3931 if (declaration->modifiers & DM_STDCALL) {
3932 if (first == NULL) first = "stdcall";
3933 else if (second == NULL) second = "stdcall";
3935 if (declaration->modifiers & DM_FASTCALL) {
3936 if (first == NULL) first = "fastcall";
3937 else if (second == NULL) second = "fastcall";
3939 if (declaration->modifiers & DM_THISCALL) {
3940 if (first == NULL) first = "thiscall";
3941 else if (second == NULL) second = "thiscall";
3943 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3946 if (declaration->modifiers & DM_CDECL)
3947 type->function.calling_convention = CC_CDECL;
3948 else if (declaration->modifiers & DM_STDCALL)
3949 type->function.calling_convention = CC_STDCALL;
3950 else if (declaration->modifiers & DM_FASTCALL)
3951 type->function.calling_convention = CC_FASTCALL;
3952 else if (declaration->modifiers & DM_THISCALL)
3953 type->function.calling_convention = CC_THISCALL;
3955 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3958 declaration_t *parameters = parse_parameters(&type->function);
3959 if (declaration != NULL) {
3960 declaration->scope.declarations = parameters;
3963 construct_function_type_t *construct_function_type =
3964 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3965 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3966 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3967 construct_function_type->function_type = type;
3969 return &construct_function_type->construct_type;
3972 static void fix_declaration_type(declaration_t *declaration)
3974 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3975 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3977 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3978 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3980 if (declaration->type->base.modifiers == type_modifiers)
3983 type_t *copy = duplicate_type(declaration->type);
3984 copy->base.modifiers = type_modifiers;
3986 type_t *result = typehash_insert(copy);
3987 if (result != copy) {
3988 obstack_free(type_obst, copy);
3991 declaration->type = result;
3994 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3995 bool may_be_abstract)
3997 /* construct a single linked list of construct_type_t's which describe
3998 * how to construct the final declarator type */
3999 construct_type_t *first = NULL;
4000 construct_type_t *last = NULL;
4001 gnu_attribute_t *attributes = NULL;
4003 decl_modifiers_t modifiers = parse_attributes(&attributes);
4006 while (token.type == '*') {
4007 construct_type_t *type = parse_pointer_declarator();
4017 /* TODO: find out if this is correct */
4018 modifiers |= parse_attributes(&attributes);
4021 if (declaration != NULL)
4022 declaration->modifiers |= modifiers;
4024 construct_type_t *inner_types = NULL;
4026 switch(token.type) {
4028 if (declaration == NULL) {
4029 errorf(HERE, "no identifier expected in typename");
4031 declaration->symbol = token.v.symbol;
4032 declaration->source_position = token.source_position;
4038 add_anchor_token(')');
4039 inner_types = parse_inner_declarator(declaration, may_be_abstract);
4040 if (inner_types != NULL) {
4041 /* All later declarators only modify the return type, not declaration */
4044 rem_anchor_token(')');
4048 if (may_be_abstract)
4050 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4051 /* avoid a loop in the outermost scope, because eat_statement doesn't
4053 if (token.type == '}' && current_function == NULL) {
4061 construct_type_t *p = last;
4064 construct_type_t *type;
4065 switch(token.type) {
4067 type = parse_function_declarator(declaration);
4070 type = parse_array_declarator();
4073 goto declarator_finished;
4076 /* insert in the middle of the list (behind p) */
4078 type->next = p->next;
4089 declarator_finished:
4090 /* append inner_types at the end of the list, we don't to set last anymore
4091 * as it's not needed anymore */
4093 assert(first == NULL);
4094 first = inner_types;
4096 last->next = inner_types;
4104 static void parse_declaration_attributes(declaration_t *declaration)
4106 gnu_attribute_t *attributes = NULL;
4107 decl_modifiers_t modifiers = parse_attributes(&attributes);
4109 if (declaration == NULL)
4112 declaration->modifiers |= modifiers;
4113 /* check if we have these stupid mode attributes... */
4114 type_t *old_type = declaration->type;
4115 if (old_type == NULL)
4118 gnu_attribute_t *attribute = attributes;
4119 for ( ; attribute != NULL; attribute = attribute->next) {
4120 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4123 atomic_type_kind_t akind = attribute->u.akind;
4124 if (!is_type_signed(old_type)) {
4126 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4127 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4128 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4129 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4131 panic("invalid akind in mode attribute");
4135 = make_atomic_type(akind, old_type->base.qualifiers);
4139 static type_t *construct_declarator_type(construct_type_t *construct_list,
4142 construct_type_t *iter = construct_list;
4143 for( ; iter != NULL; iter = iter->next) {
4144 switch(iter->kind) {
4145 case CONSTRUCT_INVALID:
4146 internal_errorf(HERE, "invalid type construction found");
4147 case CONSTRUCT_FUNCTION: {
4148 construct_function_type_t *construct_function_type
4149 = (construct_function_type_t*) iter;
4151 type_t *function_type = construct_function_type->function_type;
4153 function_type->function.return_type = type;
4155 type_t *skipped_return_type = skip_typeref(type);
4156 if (is_type_function(skipped_return_type)) {
4157 errorf(HERE, "function returning function is not allowed");
4158 type = type_error_type;
4159 } else if (is_type_array(skipped_return_type)) {
4160 errorf(HERE, "function returning array is not allowed");
4161 type = type_error_type;
4163 type = function_type;
4168 case CONSTRUCT_POINTER: {
4169 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4170 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
4171 pointer_type->pointer.points_to = type;
4172 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
4174 type = pointer_type;
4178 case CONSTRUCT_ARRAY: {
4179 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4180 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
4182 expression_t *size_expression = parsed_array->size;
4183 if (size_expression != NULL) {
4185 = create_implicit_cast(size_expression, type_size_t);
4188 array_type->base.qualifiers = parsed_array->type_qualifiers;
4189 array_type->array.element_type = type;
4190 array_type->array.is_static = parsed_array->is_static;
4191 array_type->array.is_variable = parsed_array->is_variable;
4192 array_type->array.size_expression = size_expression;
4194 if (size_expression != NULL) {
4195 if (is_constant_expression(size_expression)) {
4196 array_type->array.size_constant = true;
4197 array_type->array.size
4198 = fold_constant(size_expression);
4200 array_type->array.is_vla = true;
4204 type_t *skipped_type = skip_typeref(type);
4205 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
4206 errorf(HERE, "array of void is not allowed");
4207 type = type_error_type;
4215 type_t *hashed_type = typehash_insert(type);
4216 if (hashed_type != type) {
4217 /* the function type was constructed earlier freeing it here will
4218 * destroy other types... */
4219 if (iter->kind != CONSTRUCT_FUNCTION) {
4229 static declaration_t *parse_declarator(
4230 const declaration_specifiers_t *specifiers, bool may_be_abstract)
4232 declaration_t *const declaration = allocate_declaration_zero();
4233 declaration->source_position = specifiers->source_position;
4234 declaration->declared_storage_class = specifiers->declared_storage_class;
4235 declaration->modifiers = specifiers->modifiers;
4236 declaration->deprecated_string = specifiers->deprecated_string;
4237 declaration->get_property_sym = specifiers->get_property_sym;
4238 declaration->put_property_sym = specifiers->put_property_sym;
4239 declaration->is_inline = specifiers->is_inline;
4241 declaration->storage_class = specifiers->declared_storage_class;
4242 if (declaration->storage_class == STORAGE_CLASS_NONE
4243 && scope != global_scope) {
4244 declaration->storage_class = STORAGE_CLASS_AUTO;
4247 if (specifiers->alignment != 0) {
4248 /* TODO: add checks here */
4249 declaration->alignment = specifiers->alignment;
4252 construct_type_t *construct_type
4253 = parse_inner_declarator(declaration, may_be_abstract);
4254 type_t *const type = specifiers->type;
4255 declaration->type = construct_declarator_type(construct_type, type);
4257 parse_declaration_attributes(declaration);
4259 fix_declaration_type(declaration);
4261 if (construct_type != NULL) {
4262 obstack_free(&temp_obst, construct_type);
4268 static type_t *parse_abstract_declarator(type_t *base_type)
4270 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4272 type_t *result = construct_declarator_type(construct_type, base_type);
4273 if (construct_type != NULL) {
4274 obstack_free(&temp_obst, construct_type);
4280 static declaration_t *append_declaration(declaration_t* const declaration)
4282 if (last_declaration != NULL) {
4283 last_declaration->next = declaration;
4285 scope->declarations = declaration;
4287 last_declaration = declaration;
4292 * Check if the declaration of main is suspicious. main should be a
4293 * function with external linkage, returning int, taking either zero
4294 * arguments, two, or three arguments of appropriate types, ie.
4296 * int main([ int argc, char **argv [, char **env ] ]).
4298 * @param decl the declaration to check
4299 * @param type the function type of the declaration
4301 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4303 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4304 warningf(&decl->source_position,
4305 "'main' is normally a non-static function");
4307 if (skip_typeref(func_type->return_type) != type_int) {
4308 warningf(&decl->source_position,
4309 "return type of 'main' should be 'int', but is '%T'",
4310 func_type->return_type);
4312 const function_parameter_t *parm = func_type->parameters;
4314 type_t *const first_type = parm->type;
4315 if (!types_compatible(skip_typeref(first_type), type_int)) {
4316 warningf(&decl->source_position,
4317 "first argument of 'main' should be 'int', but is '%T'", first_type);
4321 type_t *const second_type = parm->type;
4322 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4323 warningf(&decl->source_position,
4324 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4328 type_t *const third_type = parm->type;
4329 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4330 warningf(&decl->source_position,
4331 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4335 goto warn_arg_count;
4339 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4345 * Check if a symbol is the equal to "main".
4347 static bool is_sym_main(const symbol_t *const sym)
4349 return strcmp(sym->string, "main") == 0;
4352 static declaration_t *record_declaration(
4353 declaration_t *const declaration,
4354 const bool is_definition)
4356 const symbol_t *const symbol = declaration->symbol;
4357 const namespace_t namespc = (namespace_t)declaration->namespc;
4359 assert(symbol != NULL);
4360 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4362 type_t *const orig_type = declaration->type;
4363 type_t *const type = skip_typeref(orig_type);
4364 if (is_type_function(type) &&
4365 type->function.unspecified_parameters &&
4366 warning.strict_prototypes &&
4367 previous_declaration == NULL) {
4368 warningf(&declaration->source_position,
4369 "function declaration '%#T' is not a prototype",
4370 orig_type, declaration->symbol);
4373 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4374 check_type_of_main(declaration, &type->function);
4377 if (warning.nested_externs &&
4378 declaration->storage_class == STORAGE_CLASS_EXTERN &&
4379 scope != global_scope) {
4380 warningf(&declaration->source_position,
4381 "nested extern declaration of '%#T'", declaration->type, symbol);
4384 assert(declaration != previous_declaration);
4385 if (previous_declaration != NULL
4386 && previous_declaration->parent_scope == scope) {
4387 /* can happen for K&R style declarations */
4388 if (previous_declaration->type == NULL) {
4389 previous_declaration->type = declaration->type;
4392 const type_t *prev_type = skip_typeref(previous_declaration->type);
4393 if (!types_compatible(type, prev_type)) {
4394 errorf(&declaration->source_position,
4395 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4396 orig_type, symbol, previous_declaration->type, symbol,
4397 &previous_declaration->source_position);
4399 unsigned old_storage_class = previous_declaration->storage_class;
4400 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4401 errorf(&declaration->source_position,
4402 "redeclaration of enum entry '%Y' (declared %P)",
4403 symbol, &previous_declaration->source_position);
4404 return previous_declaration;
4407 if (warning.redundant_decls &&
4409 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4410 !(previous_declaration->modifiers & DM_USED) &&
4411 !previous_declaration->used) {
4412 warningf(&previous_declaration->source_position,
4413 "unnecessary static forward declaration for '%#T'",
4414 previous_declaration->type, symbol);
4417 unsigned new_storage_class = declaration->storage_class;
4419 if (is_type_incomplete(prev_type)) {
4420 previous_declaration->type = type;
4424 /* pretend no storage class means extern for function
4425 * declarations (except if the previous declaration is neither
4426 * none nor extern) */
4427 if (is_type_function(type)) {
4428 if (prev_type->function.unspecified_parameters) {
4429 previous_declaration->type = type;
4433 switch (old_storage_class) {
4434 case STORAGE_CLASS_NONE:
4435 old_storage_class = STORAGE_CLASS_EXTERN;
4438 case STORAGE_CLASS_EXTERN:
4439 if (is_definition) {
4440 if (warning.missing_prototypes &&
4441 prev_type->function.unspecified_parameters &&
4442 !is_sym_main(symbol)) {
4443 warningf(&declaration->source_position,
4444 "no previous prototype for '%#T'",
4447 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4448 new_storage_class = STORAGE_CLASS_EXTERN;
4457 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4458 new_storage_class == STORAGE_CLASS_EXTERN) {
4459 warn_redundant_declaration:
4460 if (!is_definition &&
4461 warning.redundant_decls &&
4462 is_type_valid(prev_type) &&
4463 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4464 warningf(&declaration->source_position,
4465 "redundant declaration for '%Y' (declared %P)",
4466 symbol, &previous_declaration->source_position);
4468 } else if (current_function == NULL) {
4469 if (old_storage_class != STORAGE_CLASS_STATIC &&
4470 new_storage_class == STORAGE_CLASS_STATIC) {
4471 errorf(&declaration->source_position,
4472 "static declaration of '%Y' follows non-static declaration (declared %P)",
4473 symbol, &previous_declaration->source_position);
4474 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4475 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4476 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4478 goto warn_redundant_declaration;
4480 } else if (is_type_valid(prev_type)) {
4481 if (old_storage_class == new_storage_class) {
4482 errorf(&declaration->source_position,
4483 "redeclaration of '%Y' (declared %P)",
4484 symbol, &previous_declaration->source_position);
4486 errorf(&declaration->source_position,
4487 "redeclaration of '%Y' with different linkage (declared %P)",
4488 symbol, &previous_declaration->source_position);
4493 previous_declaration->modifiers |= declaration->modifiers;
4494 previous_declaration->is_inline |= declaration->is_inline;
4495 return previous_declaration;
4496 } else if (is_type_function(type)) {
4497 if (is_definition &&
4498 declaration->storage_class != STORAGE_CLASS_STATIC) {
4499 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4500 warningf(&declaration->source_position,
4501 "no previous prototype for '%#T'", orig_type, symbol);
4502 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4503 warningf(&declaration->source_position,
4504 "no previous declaration for '%#T'", orig_type,
4509 if (warning.missing_declarations &&
4510 scope == global_scope && (
4511 declaration->storage_class == STORAGE_CLASS_NONE ||
4512 declaration->storage_class == STORAGE_CLASS_THREAD
4514 warningf(&declaration->source_position,
4515 "no previous declaration for '%#T'", orig_type, symbol);
4519 assert(declaration->parent_scope == NULL);
4520 assert(scope != NULL);
4522 declaration->parent_scope = scope;
4524 environment_push(declaration);
4525 return append_declaration(declaration);
4528 static void parser_error_multiple_definition(declaration_t *declaration,
4529 const source_position_t *source_position)
4531 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4532 declaration->symbol, &declaration->source_position);
4535 static bool is_declaration_specifier(const token_t *token,
4536 bool only_specifiers_qualifiers)
4538 switch(token->type) {
4543 return is_typedef_symbol(token->v.symbol);
4545 case T___extension__:
4547 return !only_specifiers_qualifiers;
4554 static void parse_init_declarator_rest(declaration_t *declaration)
4558 type_t *orig_type = declaration->type;
4559 type_t *type = skip_typeref(orig_type);
4561 if (declaration->init.initializer != NULL) {
4562 parser_error_multiple_definition(declaration, HERE);
4565 bool must_be_constant = false;
4566 if (declaration->storage_class == STORAGE_CLASS_STATIC
4567 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4568 || declaration->parent_scope == global_scope) {
4569 must_be_constant = true;
4572 if (is_type_function(type)) {
4573 errorf(&declaration->source_position,
4574 "function '%#T' is initialized like a variable",
4575 orig_type, declaration->symbol);
4576 orig_type = type_error_type;
4579 parse_initializer_env_t env;
4580 env.type = orig_type;
4581 env.must_be_constant = must_be_constant;
4582 env.declaration = current_init_decl = declaration;
4584 initializer_t *initializer = parse_initializer(&env);
4585 current_init_decl = NULL;
4587 if (!is_type_function(type)) {
4588 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
4589 * the array type size */
4590 declaration->type = env.type;
4591 declaration->init.initializer = initializer;
4595 /* parse rest of a declaration without any declarator */
4596 static void parse_anonymous_declaration_rest(
4597 const declaration_specifiers_t *specifiers)
4601 declaration_t *const declaration = allocate_declaration_zero();
4602 declaration->type = specifiers->type;
4603 declaration->declared_storage_class = specifiers->declared_storage_class;
4604 declaration->source_position = specifiers->source_position;
4605 declaration->modifiers = specifiers->modifiers;
4607 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4608 warningf(&declaration->source_position,
4609 "useless storage class in empty declaration");
4611 declaration->storage_class = STORAGE_CLASS_NONE;
4613 type_t *type = declaration->type;
4614 switch (type->kind) {
4615 case TYPE_COMPOUND_STRUCT:
4616 case TYPE_COMPOUND_UNION: {
4617 if (type->compound.declaration->symbol == NULL) {
4618 warningf(&declaration->source_position,
4619 "unnamed struct/union that defines no instances");
4628 warningf(&declaration->source_position, "empty declaration");
4632 append_declaration(declaration);
4635 static void parse_declaration_rest(declaration_t *ndeclaration,
4636 const declaration_specifiers_t *specifiers,
4637 parsed_declaration_func finished_declaration)
4639 add_anchor_token(';');
4640 add_anchor_token('=');
4641 add_anchor_token(',');
4643 declaration_t *declaration =
4644 finished_declaration(ndeclaration, token.type == '=');
4646 type_t *orig_type = declaration->type;
4647 type_t *type = skip_typeref(orig_type);
4649 if (type->kind != TYPE_FUNCTION &&
4650 declaration->is_inline &&
4651 is_type_valid(type)) {
4652 warningf(&declaration->source_position,
4653 "variable '%Y' declared 'inline'\n", declaration->symbol);
4656 if (token.type == '=') {
4657 parse_init_declarator_rest(declaration);
4660 if (token.type != ',')
4664 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4669 rem_anchor_token(';');
4670 rem_anchor_token('=');
4671 rem_anchor_token(',');
4674 static declaration_t *finished_kr_declaration(declaration_t *declaration, bool is_definition)
4676 symbol_t *symbol = declaration->symbol;
4677 if (symbol == NULL) {
4678 errorf(HERE, "anonymous declaration not valid as function parameter");
4681 namespace_t namespc = (namespace_t) declaration->namespc;
4682 if (namespc != NAMESPACE_NORMAL) {
4683 return record_declaration(declaration, false);
4686 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4687 if (previous_declaration == NULL ||
4688 previous_declaration->parent_scope != scope) {
4689 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4694 if (is_definition) {
4695 errorf(HERE, "parameter %Y is initialised", declaration->symbol);
4698 if (previous_declaration->type == NULL) {
4699 previous_declaration->type = declaration->type;
4700 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4701 previous_declaration->storage_class = declaration->storage_class;
4702 previous_declaration->parent_scope = scope;
4703 return previous_declaration;
4705 return record_declaration(declaration, false);
4709 static void parse_declaration(parsed_declaration_func finished_declaration)
4711 declaration_specifiers_t specifiers;
4712 memset(&specifiers, 0, sizeof(specifiers));
4713 parse_declaration_specifiers(&specifiers);
4715 if (token.type == ';') {
4716 parse_anonymous_declaration_rest(&specifiers);
4718 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4719 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4723 static type_t *get_default_promoted_type(type_t *orig_type)
4725 type_t *result = orig_type;
4727 type_t *type = skip_typeref(orig_type);
4728 if (is_type_integer(type)) {
4729 result = promote_integer(type);
4730 } else if (type == type_float) {
4731 result = type_double;
4737 static void parse_kr_declaration_list(declaration_t *declaration)
4739 type_t *type = skip_typeref(declaration->type);
4740 if (!is_type_function(type))
4743 if (!type->function.kr_style_parameters)
4746 /* push function parameters */
4747 int top = environment_top();
4748 scope_t *last_scope = scope;
4749 set_scope(&declaration->scope);
4751 declaration_t *parameter = declaration->scope.declarations;
4752 for ( ; parameter != NULL; parameter = parameter->next) {
4753 assert(parameter->parent_scope == NULL);
4754 parameter->parent_scope = scope;
4755 environment_push(parameter);
4758 /* parse declaration list */
4759 while (is_declaration_specifier(&token, false)) {
4760 parse_declaration(finished_kr_declaration);
4763 /* pop function parameters */
4764 assert(scope == &declaration->scope);
4765 set_scope(last_scope);
4766 environment_pop_to(top);
4768 /* update function type */
4769 type_t *new_type = duplicate_type(type);
4771 function_parameter_t *parameters = NULL;
4772 function_parameter_t *last_parameter = NULL;
4774 declaration_t *parameter_declaration = declaration->scope.declarations;
4775 for( ; parameter_declaration != NULL;
4776 parameter_declaration = parameter_declaration->next) {
4777 type_t *parameter_type = parameter_declaration->type;
4778 if (parameter_type == NULL) {
4780 errorf(HERE, "no type specified for function parameter '%Y'",
4781 parameter_declaration->symbol);
4783 if (warning.implicit_int) {
4784 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4785 parameter_declaration->symbol);
4787 parameter_type = type_int;
4788 parameter_declaration->type = parameter_type;
4792 semantic_parameter(parameter_declaration);
4793 parameter_type = parameter_declaration->type;
4796 * we need the default promoted types for the function type
4798 parameter_type = get_default_promoted_type(parameter_type);
4800 function_parameter_t *function_parameter
4801 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4802 memset(function_parameter, 0, sizeof(function_parameter[0]));
4804 function_parameter->type = parameter_type;
4805 if (last_parameter != NULL) {
4806 last_parameter->next = function_parameter;
4808 parameters = function_parameter;
4810 last_parameter = function_parameter;
4813 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4815 new_type->function.parameters = parameters;
4816 new_type->function.unspecified_parameters = true;
4818 type = typehash_insert(new_type);
4819 if (type != new_type) {
4820 obstack_free(type_obst, new_type);
4823 declaration->type = type;
4826 static bool first_err = true;
4829 * When called with first_err set, prints the name of the current function,
4832 static void print_in_function(void)
4836 diagnosticf("%s: In function '%Y':\n",
4837 current_function->source_position.input_name,
4838 current_function->symbol);
4843 * Check if all labels are defined in the current function.
4844 * Check if all labels are used in the current function.
4846 static void check_labels(void)
4848 for (const goto_statement_t *goto_statement = goto_first;
4849 goto_statement != NULL;
4850 goto_statement = goto_statement->next) {
4851 /* skip computed gotos */
4852 if (goto_statement->expression != NULL)
4855 declaration_t *label = goto_statement->label;
4858 if (label->source_position.input_name == NULL) {
4859 print_in_function();
4860 errorf(&goto_statement->base.source_position,
4861 "label '%Y' used but not defined", label->symbol);
4864 goto_first = goto_last = NULL;
4866 if (warning.unused_label) {
4867 for (const label_statement_t *label_statement = label_first;
4868 label_statement != NULL;
4869 label_statement = label_statement->next) {
4870 const declaration_t *label = label_statement->label;
4872 if (! label->used) {
4873 print_in_function();
4874 warningf(&label_statement->base.source_position,
4875 "label '%Y' defined but not used", label->symbol);
4879 label_first = label_last = NULL;
4883 * Check declarations of current_function for unused entities.
4885 static void check_declarations(void)
4887 if (warning.unused_parameter) {
4888 const scope_t *scope = ¤t_function->scope;
4890 if (is_sym_main(current_function->symbol)) {
4891 /* do not issue unused warnings for main */
4894 const declaration_t *parameter = scope->declarations;
4895 for (; parameter != NULL; parameter = parameter->next) {
4896 if (! parameter->used) {
4897 print_in_function();
4898 warningf(¶meter->source_position,
4899 "unused parameter '%Y'", parameter->symbol);
4903 if (warning.unused_variable) {
4907 static int determine_truth(expression_t const* const cond)
4910 !is_constant_expression(cond) ? 0 :
4911 fold_constant(cond) != 0 ? 1 :
4915 static bool noreturn_candidate;
4917 static void check_reachable(statement_t *const stmt)
4919 if (stmt->base.reachable)
4921 if (stmt->kind != STATEMENT_DO_WHILE)
4922 stmt->base.reachable = true;
4924 statement_t *last = stmt;
4926 switch (stmt->kind) {
4927 case STATEMENT_INVALID:
4928 case STATEMENT_EMPTY:
4929 case STATEMENT_DECLARATION:
4931 next = stmt->base.next;
4934 case STATEMENT_COMPOUND:
4935 next = stmt->compound.statements;
4938 case STATEMENT_RETURN:
4939 noreturn_candidate = false;
4942 case STATEMENT_IF: {
4943 if_statement_t const* const ifs = &stmt->ifs;
4944 int const val = determine_truth(ifs->condition);
4947 check_reachable(ifs->true_statement);
4952 if (ifs->false_statement != NULL) {
4953 check_reachable(ifs->false_statement);
4957 next = stmt->base.next;
4961 case STATEMENT_SWITCH: {
4962 switch_statement_t const *const switchs = &stmt->switchs;
4963 expression_t const *const expr = switchs->expression;
4965 if (is_constant_expression(expr)) {
4966 long const val = fold_constant(expr);
4967 case_label_statement_t * defaults = NULL;
4968 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4969 if (i->expression == NULL) {
4974 if (i->first_case <= val && val <= i->last_case) {
4975 check_reachable((statement_t*)i);
4980 if (defaults != NULL) {
4981 check_reachable((statement_t*)defaults);
4985 bool has_default = false;
4986 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4987 if (i->expression == NULL)
4990 check_reachable((statement_t*)i);
4997 next = stmt->base.next;
5001 case STATEMENT_EXPRESSION: {
5002 /* Check for noreturn function call */
5003 expression_t const *const expr = stmt->expression.expression;
5004 if (expr->kind == EXPR_CALL) {
5005 expression_t const *const func = expr->call.function;
5006 if (func->kind == EXPR_REFERENCE) {
5007 declaration_t const *const decl = func->reference.declaration;
5008 if (decl != NULL && decl->modifiers & DM_NORETURN) {
5014 next = stmt->base.next;
5018 case STATEMENT_CONTINUE: {
5019 statement_t *parent = stmt;
5021 parent = parent->base.parent;
5022 if (parent == NULL) /* continue not within loop */
5026 switch (parent->kind) {
5027 case STATEMENT_WHILE: goto continue_while;
5028 case STATEMENT_DO_WHILE: goto continue_do_while;
5029 case STATEMENT_FOR: goto continue_for;
5036 case STATEMENT_BREAK: {
5037 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;
5059 case STATEMENT_GOTO:
5060 if (stmt->gotos.expression) {
5061 statement_t *parent = stmt->base.parent;
5062 if (parent == NULL) /* top level goto */
5066 next = stmt->gotos.label->init.statement;
5067 if (next == NULL) /* missing label */
5072 case STATEMENT_LABEL:
5073 next = stmt->label.statement;
5076 case STATEMENT_CASE_LABEL:
5077 next = stmt->case_label.statement;
5080 case STATEMENT_WHILE: {
5081 while_statement_t const *const whiles = &stmt->whiles;
5082 int const val = determine_truth(whiles->condition);
5085 check_reachable(whiles->body);
5090 next = stmt->base.next;
5094 case STATEMENT_DO_WHILE:
5095 next = stmt->do_while.body;
5098 case STATEMENT_FOR: {
5099 for_statement_t *const fors = &stmt->fors;
5101 if (fors->condition_reachable)
5103 fors->condition_reachable = true;
5105 expression_t const *const cond = fors->condition;
5107 cond == NULL ? 1 : determine_truth(cond);
5110 check_reachable(fors->body);
5115 next = stmt->base.next;
5119 case STATEMENT_MS_TRY: {
5120 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5121 check_reachable(ms_try->try_statement);
5122 next = ms_try->final_statement;
5126 case STATEMENT_LEAVE: {
5127 statement_t *parent = stmt;
5129 parent = parent->base.parent;
5130 if (parent == NULL) /* __leave not within __try */
5133 if (parent->kind == STATEMENT_MS_TRY) {
5135 next = parent->ms_try.final_statement;
5143 while (next == NULL) {
5144 next = last->base.parent;
5146 noreturn_candidate = false;
5148 type_t *const type = current_function->type;
5149 assert(is_type_function(type));
5150 type_t *const ret = skip_typeref(type->function.return_type);
5151 if (warning.return_type &&
5152 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5153 is_type_valid(ret) &&
5154 !is_sym_main(current_function->symbol)) {
5155 warningf(&stmt->base.source_position,
5156 "control reaches end of non-void function");
5161 switch (next->kind) {
5162 case STATEMENT_INVALID:
5163 case STATEMENT_EMPTY:
5164 case STATEMENT_DECLARATION:
5165 case STATEMENT_EXPRESSION:
5167 case STATEMENT_RETURN:
5168 case STATEMENT_CONTINUE:
5169 case STATEMENT_BREAK:
5170 case STATEMENT_GOTO:
5171 case STATEMENT_LEAVE:
5172 panic("invalid control flow in function");
5174 case STATEMENT_COMPOUND:
5176 case STATEMENT_SWITCH:
5177 case STATEMENT_LABEL:
5178 case STATEMENT_CASE_LABEL:
5180 next = next->base.next;
5183 case STATEMENT_WHILE: {
5185 if (next->base.reachable)
5187 next->base.reachable = true;
5189 while_statement_t const *const whiles = &next->whiles;
5190 int const val = determine_truth(whiles->condition);
5193 check_reachable(whiles->body);
5199 next = next->base.next;
5203 case STATEMENT_DO_WHILE: {
5205 if (next->base.reachable)
5207 next->base.reachable = true;
5209 do_while_statement_t const *const dw = &next->do_while;
5210 int const val = determine_truth(dw->condition);
5213 check_reachable(dw->body);
5219 next = next->base.next;
5223 case STATEMENT_FOR: {
5225 for_statement_t *const fors = &next->fors;
5227 fors->step_reachable = true;
5229 if (fors->condition_reachable)
5231 fors->condition_reachable = true;
5233 expression_t const *const cond = fors->condition;
5235 cond == NULL ? 1 : determine_truth(cond);
5238 check_reachable(fors->body);
5244 next = next->base.next;
5248 case STATEMENT_MS_TRY:
5250 next = next->ms_try.final_statement;
5256 next = stmt->base.parent;
5258 warningf(&stmt->base.source_position,
5259 "control reaches end of non-void function");
5263 check_reachable(next);
5266 static void check_unreachable(statement_t const* const stmt)
5268 if (!stmt->base.reachable &&
5269 stmt->kind != STATEMENT_DO_WHILE &&
5270 stmt->kind != STATEMENT_FOR &&
5271 (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) {
5272 warningf(&stmt->base.source_position, "statement is unreachable");
5275 switch (stmt->kind) {
5276 case STATEMENT_INVALID:
5277 case STATEMENT_EMPTY:
5278 case STATEMENT_RETURN:
5279 case STATEMENT_DECLARATION:
5280 case STATEMENT_EXPRESSION:
5281 case STATEMENT_CONTINUE:
5282 case STATEMENT_BREAK:
5283 case STATEMENT_GOTO:
5285 case STATEMENT_LEAVE:
5288 case STATEMENT_COMPOUND:
5289 if (stmt->compound.statements)
5290 check_unreachable(stmt->compound.statements);
5294 check_unreachable(stmt->ifs.true_statement);
5295 if (stmt->ifs.false_statement != NULL)
5296 check_unreachable(stmt->ifs.false_statement);
5299 case STATEMENT_SWITCH:
5300 check_unreachable(stmt->switchs.body);
5303 case STATEMENT_LABEL:
5304 check_unreachable(stmt->label.statement);
5307 case STATEMENT_CASE_LABEL:
5308 check_unreachable(stmt->case_label.statement);
5311 case STATEMENT_WHILE:
5312 check_unreachable(stmt->whiles.body);
5315 case STATEMENT_DO_WHILE:
5316 check_unreachable(stmt->do_while.body);
5317 if (!stmt->base.reachable) {
5318 expression_t const *const cond = stmt->do_while.condition;
5319 if (determine_truth(cond) >= 0) {
5320 warningf(&cond->base.source_position,
5321 "condition of do-while-loop is unreachable");
5326 case STATEMENT_FOR: {
5327 for_statement_t const* const fors = &stmt->fors;
5329 // if init and step are unreachable, cond is unreachable, too
5330 if (!stmt->base.reachable && !fors->step_reachable) {
5331 warningf(&stmt->base.source_position, "statement is unreachable");
5333 if (!stmt->base.reachable && fors->initialisation != NULL) {
5334 warningf(&fors->initialisation->base.source_position,
5335 "initialisation of for-statement is unreachable");
5338 if (!fors->condition_reachable && fors->condition != NULL) {
5339 warningf(&fors->condition->base.source_position,
5340 "condition of for-statement is unreachable");
5343 if (!fors->step_reachable && fors->step != NULL) {
5344 warningf(&fors->step->base.source_position,
5345 "step of for-statement is unreachable");
5349 check_unreachable(fors->body);
5353 case STATEMENT_MS_TRY: {
5354 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5355 check_unreachable(ms_try->try_statement);
5356 check_unreachable(ms_try->final_statement);
5360 if (stmt->base.next)
5361 check_unreachable(stmt->base.next);
5364 static void parse_external_declaration(void)
5366 /* function-definitions and declarations both start with declaration
5368 declaration_specifiers_t specifiers;
5369 memset(&specifiers, 0, sizeof(specifiers));
5371 add_anchor_token(';');
5372 parse_declaration_specifiers(&specifiers);
5373 rem_anchor_token(';');
5375 /* must be a declaration */
5376 if (token.type == ';') {
5377 parse_anonymous_declaration_rest(&specifiers);
5381 add_anchor_token(',');
5382 add_anchor_token('=');
5383 rem_anchor_token(';');
5385 /* declarator is common to both function-definitions and declarations */
5386 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
5388 rem_anchor_token(',');
5389 rem_anchor_token('=');
5390 rem_anchor_token(';');
5392 /* must be a declaration */
5393 switch (token.type) {
5397 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
5401 /* must be a function definition */
5402 parse_kr_declaration_list(ndeclaration);
5404 if (token.type != '{') {
5405 parse_error_expected("while parsing function definition", '{', NULL);
5406 eat_until_matching_token(';');
5410 type_t *type = ndeclaration->type;
5412 /* note that we don't skip typerefs: the standard doesn't allow them here
5413 * (so we can't use is_type_function here) */
5414 if (type->kind != TYPE_FUNCTION) {
5415 if (is_type_valid(type)) {
5416 errorf(HERE, "declarator '%#T' has a body but is not a function type",
5417 type, ndeclaration->symbol);
5423 if (warning.aggregate_return &&
5424 is_type_compound(skip_typeref(type->function.return_type))) {
5425 warningf(HERE, "function '%Y' returns an aggregate",
5426 ndeclaration->symbol);
5428 if (warning.traditional && !type->function.unspecified_parameters) {
5429 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5430 ndeclaration->symbol);
5432 if (warning.old_style_definition && type->function.unspecified_parameters) {
5433 warningf(HERE, "old-style function definition '%Y'",
5434 ndeclaration->symbol);
5437 /* § 6.7.5.3 (14) a function definition with () means no
5438 * parameters (and not unspecified parameters) */
5439 if (type->function.unspecified_parameters
5440 && type->function.parameters == NULL
5441 && !type->function.kr_style_parameters) {
5442 type_t *duplicate = duplicate_type(type);
5443 duplicate->function.unspecified_parameters = false;
5445 type = typehash_insert(duplicate);
5446 if (type != duplicate) {
5447 obstack_free(type_obst, duplicate);
5449 ndeclaration->type = type;
5452 declaration_t *const declaration = record_declaration(ndeclaration, true);
5453 if (ndeclaration != declaration) {
5454 declaration->scope = ndeclaration->scope;
5456 type = skip_typeref(declaration->type);
5458 /* push function parameters and switch scope */
5459 int top = environment_top();
5460 scope_t *last_scope = scope;
5461 set_scope(&declaration->scope);
5463 declaration_t *parameter = declaration->scope.declarations;
5464 for( ; parameter != NULL; parameter = parameter->next) {
5465 if (parameter->parent_scope == &ndeclaration->scope) {
5466 parameter->parent_scope = scope;
5468 assert(parameter->parent_scope == NULL
5469 || parameter->parent_scope == scope);
5470 parameter->parent_scope = scope;
5471 if (parameter->symbol == NULL) {
5472 errorf(¶meter->source_position, "parameter name omitted");
5475 environment_push(parameter);
5478 if (declaration->init.statement != NULL) {
5479 parser_error_multiple_definition(declaration, HERE);
5482 /* parse function body */
5483 int label_stack_top = label_top();
5484 declaration_t *old_current_function = current_function;
5485 current_function = declaration;
5486 current_parent = NULL;
5488 statement_t *const body = parse_compound_statement(false);
5489 declaration->init.statement = body;
5492 check_declarations();
5493 if (warning.return_type ||
5494 warning.unreachable_code ||
5495 (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) {
5496 noreturn_candidate = true;
5497 check_reachable(body);
5498 if (warning.unreachable_code)
5499 check_unreachable(body);
5500 if (warning.missing_noreturn &&
5501 noreturn_candidate &&
5502 !(declaration->modifiers & DM_NORETURN)) {
5503 warningf(&body->base.source_position,
5504 "function '%#T' is candidate for attribute 'noreturn'",
5505 type, declaration->symbol);
5509 assert(current_parent == NULL);
5510 assert(current_function == declaration);
5511 current_function = old_current_function;
5512 label_pop_to(label_stack_top);
5515 assert(scope == &declaration->scope);
5516 set_scope(last_scope);
5517 environment_pop_to(top);
5520 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5521 source_position_t *source_position)
5523 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
5525 type->bitfield.base_type = base_type;
5526 type->bitfield.size_expression = size;
5528 if (is_constant_expression(size)) {
5529 type->bitfield.bit_size = fold_constant(size);
5535 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
5538 declaration_t *iter = compound_declaration->scope.declarations;
5539 for( ; iter != NULL; iter = iter->next) {
5540 if (iter->namespc != NAMESPACE_NORMAL)
5543 if (iter->symbol == NULL) {
5544 type_t *type = skip_typeref(iter->type);
5545 if (is_type_compound(type)) {
5546 declaration_t *result
5547 = find_compound_entry(type->compound.declaration, symbol);
5554 if (iter->symbol == symbol) {
5562 static void parse_compound_declarators(declaration_t *struct_declaration,
5563 const declaration_specifiers_t *specifiers)
5565 declaration_t *last_declaration = struct_declaration->scope.declarations;
5566 if (last_declaration != NULL) {
5567 while (last_declaration->next != NULL) {
5568 last_declaration = last_declaration->next;
5573 declaration_t *declaration;
5575 if (token.type == ':') {
5576 source_position_t source_position = *HERE;
5579 type_t *base_type = specifiers->type;
5580 expression_t *size = parse_constant_expression();
5582 if (!is_type_integer(skip_typeref(base_type))) {
5583 errorf(HERE, "bitfield base type '%T' is not an integer type",
5587 type_t *type = make_bitfield_type(base_type, size, &source_position);
5589 declaration = allocate_declaration_zero();
5590 declaration->namespc = NAMESPACE_NORMAL;
5591 declaration->declared_storage_class = STORAGE_CLASS_NONE;
5592 declaration->storage_class = STORAGE_CLASS_NONE;
5593 declaration->source_position = source_position;
5594 declaration->modifiers = specifiers->modifiers;
5595 declaration->type = type;
5597 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
5599 type_t *orig_type = declaration->type;
5600 type_t *type = skip_typeref(orig_type);
5602 if (token.type == ':') {
5603 source_position_t source_position = *HERE;
5605 expression_t *size = parse_constant_expression();
5607 if (!is_type_integer(type)) {
5608 errorf(HERE, "bitfield base type '%T' is not an integer type",
5612 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
5613 declaration->type = bitfield_type;
5615 /* TODO we ignore arrays for now... what is missing is a check
5616 * that they're at the end of the struct */
5617 if (is_type_incomplete(type) && !is_type_array(type)) {
5619 "compound member '%Y' has incomplete type '%T'",
5620 declaration->symbol, orig_type);
5621 } else if (is_type_function(type)) {
5622 errorf(HERE, "compound member '%Y' must not have function type '%T'",
5623 declaration->symbol, orig_type);
5628 /* make sure we don't define a symbol multiple times */
5629 symbol_t *symbol = declaration->symbol;
5630 if (symbol != NULL) {
5631 declaration_t *prev_decl
5632 = find_compound_entry(struct_declaration, symbol);
5634 if (prev_decl != NULL) {
5635 assert(prev_decl->symbol == symbol);
5636 errorf(&declaration->source_position,
5637 "multiple declarations of symbol '%Y' (declared %P)",
5638 symbol, &prev_decl->source_position);
5642 /* append declaration */
5643 if (last_declaration != NULL) {
5644 last_declaration->next = declaration;
5646 struct_declaration->scope.declarations = declaration;
5648 last_declaration = declaration;
5650 if (token.type != ',')
5660 static void parse_compound_type_entries(declaration_t *compound_declaration)
5663 add_anchor_token('}');
5665 while (token.type != '}' && token.type != T_EOF) {
5666 declaration_specifiers_t specifiers;
5667 memset(&specifiers, 0, sizeof(specifiers));
5668 parse_declaration_specifiers(&specifiers);
5670 parse_compound_declarators(compound_declaration, &specifiers);
5672 rem_anchor_token('}');
5674 if (token.type == T_EOF) {
5675 errorf(HERE, "EOF while parsing struct");
5680 static type_t *parse_typename(void)
5682 declaration_specifiers_t specifiers;
5683 memset(&specifiers, 0, sizeof(specifiers));
5684 parse_declaration_specifiers(&specifiers);
5685 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
5686 /* TODO: improve error message, user does probably not know what a
5687 * storage class is...
5689 errorf(HERE, "typename may not have a storage class");
5692 type_t *result = parse_abstract_declarator(specifiers.type);
5700 typedef expression_t* (*parse_expression_function) (unsigned precedence);
5701 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
5702 expression_t *left);
5704 typedef struct expression_parser_function_t expression_parser_function_t;
5705 struct expression_parser_function_t {
5706 unsigned precedence;
5707 parse_expression_function parser;
5708 unsigned infix_precedence;
5709 parse_expression_infix_function infix_parser;
5712 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5715 * Prints an error message if an expression was expected but not read
5717 static expression_t *expected_expression_error(void)
5719 /* skip the error message if the error token was read */
5720 if (token.type != T_ERROR) {
5721 errorf(HERE, "expected expression, got token '%K'", &token);
5725 return create_invalid_expression();
5729 * Parse a string constant.
5731 static expression_t *parse_string_const(void)
5734 if (token.type == T_STRING_LITERAL) {
5735 string_t res = token.v.string;
5737 while (token.type == T_STRING_LITERAL) {
5738 res = concat_strings(&res, &token.v.string);
5741 if (token.type != T_WIDE_STRING_LITERAL) {
5742 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
5743 /* note: that we use type_char_ptr here, which is already the
5744 * automatic converted type. revert_automatic_type_conversion
5745 * will construct the array type */
5746 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
5747 cnst->string.value = res;
5751 wres = concat_string_wide_string(&res, &token.v.wide_string);
5753 wres = token.v.wide_string;
5758 switch (token.type) {
5759 case T_WIDE_STRING_LITERAL:
5760 wres = concat_wide_strings(&wres, &token.v.wide_string);
5763 case T_STRING_LITERAL:
5764 wres = concat_wide_string_string(&wres, &token.v.string);
5768 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5769 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5770 cnst->wide_string.value = wres;
5779 * Parse an integer constant.
5781 static expression_t *parse_int_const(void)
5783 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5784 cnst->base.source_position = *HERE;
5785 cnst->base.type = token.datatype;
5786 cnst->conste.v.int_value = token.v.intvalue;
5794 * Parse a character constant.
5796 static expression_t *parse_character_constant(void)
5798 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5800 cnst->base.source_position = *HERE;
5801 cnst->base.type = token.datatype;
5802 cnst->conste.v.character = token.v.string;
5804 if (cnst->conste.v.character.size != 1) {
5805 if (warning.multichar && (c_mode & _GNUC)) {
5807 warningf(HERE, "multi-character character constant");
5809 errorf(HERE, "more than 1 characters in character constant");
5818 * Parse a wide character constant.
5820 static expression_t *parse_wide_character_constant(void)
5822 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5824 cnst->base.source_position = *HERE;
5825 cnst->base.type = token.datatype;
5826 cnst->conste.v.wide_character = token.v.wide_string;
5828 if (cnst->conste.v.wide_character.size != 1) {
5829 if (warning.multichar && (c_mode & _GNUC)) {
5831 warningf(HERE, "multi-character character constant");
5833 errorf(HERE, "more than 1 characters in character constant");
5842 * Parse a float constant.
5844 static expression_t *parse_float_const(void)
5846 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5847 cnst->base.type = token.datatype;
5848 cnst->conste.v.float_value = token.v.floatvalue;
5855 static declaration_t *create_implicit_function(symbol_t *symbol,
5856 const source_position_t *source_position)
5858 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5859 ntype->function.return_type = type_int;
5860 ntype->function.unspecified_parameters = true;
5862 type_t *type = typehash_insert(ntype);
5863 if (type != ntype) {
5867 declaration_t *const declaration = allocate_declaration_zero();
5868 declaration->storage_class = STORAGE_CLASS_EXTERN;
5869 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5870 declaration->type = type;
5871 declaration->symbol = symbol;
5872 declaration->source_position = *source_position;
5873 declaration->implicit = true;
5875 bool strict_prototypes_old = warning.strict_prototypes;
5876 warning.strict_prototypes = false;
5877 record_declaration(declaration, false);
5878 warning.strict_prototypes = strict_prototypes_old;
5884 * Creates a return_type (func)(argument_type) function type if not
5887 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5888 type_t *argument_type2)
5890 function_parameter_t *parameter2
5891 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5892 memset(parameter2, 0, sizeof(parameter2[0]));
5893 parameter2->type = argument_type2;
5895 function_parameter_t *parameter1
5896 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5897 memset(parameter1, 0, sizeof(parameter1[0]));
5898 parameter1->type = argument_type1;
5899 parameter1->next = parameter2;
5901 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5902 type->function.return_type = return_type;
5903 type->function.parameters = parameter1;
5905 type_t *result = typehash_insert(type);
5906 if (result != type) {
5914 * Creates a return_type (func)(argument_type) function type if not
5917 * @param return_type the return type
5918 * @param argument_type the argument type
5920 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5922 function_parameter_t *parameter
5923 = obstack_alloc(type_obst, sizeof(parameter[0]));
5924 memset(parameter, 0, sizeof(parameter[0]));
5925 parameter->type = argument_type;
5927 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5928 type->function.return_type = return_type;
5929 type->function.parameters = parameter;
5931 type_t *result = typehash_insert(type);
5932 if (result != type) {
5939 static type_t *make_function_0_type(type_t *return_type)
5941 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5942 type->function.return_type = return_type;
5943 type->function.parameters = NULL;
5945 type_t *result = typehash_insert(type);
5946 if (result != type) {
5954 * Creates a function type for some function like builtins.
5956 * @param symbol the symbol describing the builtin
5958 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5960 switch(symbol->ID) {
5961 case T___builtin_alloca:
5962 return make_function_1_type(type_void_ptr, type_size_t);
5963 case T___builtin_huge_val:
5964 return make_function_0_type(type_double);
5965 case T___builtin_nan:
5966 return make_function_1_type(type_double, type_char_ptr);
5967 case T___builtin_nanf:
5968 return make_function_1_type(type_float, type_char_ptr);
5969 case T___builtin_nand:
5970 return make_function_1_type(type_long_double, type_char_ptr);
5971 case T___builtin_va_end:
5972 return make_function_1_type(type_void, type_valist);
5973 case T___builtin_expect:
5974 return make_function_2_type(type_long, type_long, type_long);
5976 internal_errorf(HERE, "not implemented builtin symbol found");
5981 * Performs automatic type cast as described in § 6.3.2.1.
5983 * @param orig_type the original type
5985 static type_t *automatic_type_conversion(type_t *orig_type)
5987 type_t *type = skip_typeref(orig_type);
5988 if (is_type_array(type)) {
5989 array_type_t *array_type = &type->array;
5990 type_t *element_type = array_type->element_type;
5991 unsigned qualifiers = array_type->base.qualifiers;
5993 return make_pointer_type(element_type, qualifiers);
5996 if (is_type_function(type)) {
5997 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6004 * reverts the automatic casts of array to pointer types and function
6005 * to function-pointer types as defined § 6.3.2.1
6007 type_t *revert_automatic_type_conversion(const expression_t *expression)
6009 switch (expression->kind) {
6010 case EXPR_REFERENCE: return expression->reference.declaration->type;
6013 return get_qualified_type(expression->select.compound_entry->type,
6014 expression->base.type->base.qualifiers);
6016 case EXPR_UNARY_DEREFERENCE: {
6017 const expression_t *const value = expression->unary.value;
6018 type_t *const type = skip_typeref(value->base.type);
6019 assert(is_type_pointer(type));
6020 return type->pointer.points_to;
6023 case EXPR_BUILTIN_SYMBOL:
6024 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6026 case EXPR_ARRAY_ACCESS: {
6027 const expression_t *array_ref = expression->array_access.array_ref;
6028 type_t *type_left = skip_typeref(array_ref->base.type);
6029 if (!is_type_valid(type_left))
6031 assert(is_type_pointer(type_left));
6032 return type_left->pointer.points_to;
6035 case EXPR_STRING_LITERAL: {
6036 size_t size = expression->string.value.size;
6037 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6040 case EXPR_WIDE_STRING_LITERAL: {
6041 size_t size = expression->wide_string.value.size;
6042 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6045 case EXPR_COMPOUND_LITERAL:
6046 return expression->compound_literal.type;
6051 return expression->base.type;
6054 static expression_t *parse_reference(void)
6056 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
6058 reference_expression_t *ref = &expression->reference;
6059 symbol_t *const symbol = token.v.symbol;
6061 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
6063 if (declaration == NULL) {
6064 if (!strict_mode && look_ahead(1)->type == '(') {
6065 /* an implicitly declared function */
6066 if (warning.implicit_function_declaration) {
6067 warningf(HERE, "implicit declaration of function '%Y'",
6071 declaration = create_implicit_function(symbol, HERE);
6073 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6074 declaration = create_error_declaration(symbol, STORAGE_CLASS_NONE);
6078 type_t *type = declaration->type;
6080 /* we always do the auto-type conversions; the & and sizeof parser contains
6081 * code to revert this! */
6082 type = automatic_type_conversion(type);
6084 ref->declaration = declaration;
6085 ref->base.type = type;
6087 /* this declaration is used */
6088 declaration->used = true;
6090 /* check for deprecated functions */
6091 if (warning.deprecated_declarations &&
6092 declaration->modifiers & DM_DEPRECATED) {
6093 char const *const prefix = is_type_function(declaration->type) ?
6094 "function" : "variable";
6096 if (declaration->deprecated_string != NULL) {
6097 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6098 prefix, declaration->symbol, &declaration->source_position,
6099 declaration->deprecated_string);
6101 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6102 declaration->symbol, &declaration->source_position);
6105 if (warning.init_self && declaration == current_init_decl) {
6106 current_init_decl = NULL;
6107 warningf(HERE, "variable '%#T' is initialized by itself",
6108 declaration->type, declaration->symbol);
6115 static bool semantic_cast(expression_t *cast)
6117 expression_t *expression = cast->unary.value;
6118 type_t *orig_dest_type = cast->base.type;
6119 type_t *orig_type_right = expression->base.type;
6120 type_t const *dst_type = skip_typeref(orig_dest_type);
6121 type_t const *src_type = skip_typeref(orig_type_right);
6122 source_position_t const *pos = &cast->base.source_position;
6124 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6125 if (dst_type == type_void)
6128 /* only integer and pointer can be casted to pointer */
6129 if (is_type_pointer(dst_type) &&
6130 !is_type_pointer(src_type) &&
6131 !is_type_integer(src_type) &&
6132 is_type_valid(src_type)) {
6133 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6137 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6138 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6142 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6143 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6147 if (warning.cast_qual &&
6148 is_type_pointer(src_type) &&
6149 is_type_pointer(dst_type)) {
6150 type_t *src = skip_typeref(src_type->pointer.points_to);
6151 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6152 unsigned missing_qualifiers =
6153 src->base.qualifiers & ~dst->base.qualifiers;
6154 if (missing_qualifiers != 0) {
6156 "cast discards qualifiers '%Q' in pointer target type of '%T'",
6157 missing_qualifiers, orig_type_right);
6163 static expression_t *parse_compound_literal(type_t *type)
6165 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6167 parse_initializer_env_t env;
6169 env.declaration = NULL;
6170 env.must_be_constant = false;
6171 initializer_t *initializer = parse_initializer(&env);
6174 expression->compound_literal.initializer = initializer;
6175 expression->compound_literal.type = type;
6176 expression->base.type = automatic_type_conversion(type);
6182 * Parse a cast expression.
6184 static expression_t *parse_cast(void)
6186 source_position_t source_position = token.source_position;
6188 type_t *type = parse_typename();
6190 /* matching add_anchor_token() is at call site */
6191 rem_anchor_token(')');
6194 if (token.type == '{') {
6195 return parse_compound_literal(type);
6198 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6199 cast->base.source_position = source_position;
6201 expression_t *value = parse_sub_expression(20);
6202 cast->base.type = type;
6203 cast->unary.value = value;
6205 if (! semantic_cast(cast)) {
6206 /* TODO: record the error in the AST. else it is impossible to detect it */
6211 return create_invalid_expression();
6215 * Parse a statement expression.
6217 static expression_t *parse_statement_expression(void)
6219 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6221 statement_t *statement = parse_compound_statement(true);
6222 expression->statement.statement = statement;
6223 expression->base.source_position = statement->base.source_position;
6225 /* find last statement and use its type */
6226 type_t *type = type_void;
6227 const statement_t *stmt = statement->compound.statements;
6229 while (stmt->base.next != NULL)
6230 stmt = stmt->base.next;
6232 if (stmt->kind == STATEMENT_EXPRESSION) {
6233 type = stmt->expression.expression->base.type;
6236 warningf(&expression->base.source_position, "empty statement expression ({})");
6238 expression->base.type = type;
6244 return create_invalid_expression();
6248 * Parse a parenthesized expression.
6250 static expression_t *parse_parenthesized_expression(void)
6253 add_anchor_token(')');
6255 switch(token.type) {
6257 /* gcc extension: a statement expression */
6258 return parse_statement_expression();
6262 return parse_cast();
6264 if (is_typedef_symbol(token.v.symbol)) {
6265 return parse_cast();
6269 expression_t *result = parse_expression();
6270 rem_anchor_token(')');
6275 return create_invalid_expression();
6278 static expression_t *parse_function_keyword(void)
6283 if (current_function == NULL) {
6284 errorf(HERE, "'__func__' used outside of a function");
6287 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6288 expression->base.type = type_char_ptr;
6289 expression->funcname.kind = FUNCNAME_FUNCTION;
6294 static expression_t *parse_pretty_function_keyword(void)
6296 eat(T___PRETTY_FUNCTION__);
6298 if (current_function == NULL) {
6299 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6302 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6303 expression->base.type = type_char_ptr;
6304 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6309 static expression_t *parse_funcsig_keyword(void)
6313 if (current_function == NULL) {
6314 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6317 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6318 expression->base.type = type_char_ptr;
6319 expression->funcname.kind = FUNCNAME_FUNCSIG;
6324 static expression_t *parse_funcdname_keyword(void)
6326 eat(T___FUNCDNAME__);
6328 if (current_function == NULL) {
6329 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6332 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6333 expression->base.type = type_char_ptr;
6334 expression->funcname.kind = FUNCNAME_FUNCDNAME;
6339 static designator_t *parse_designator(void)
6341 designator_t *result = allocate_ast_zero(sizeof(result[0]));
6342 result->source_position = *HERE;
6344 if (token.type != T_IDENTIFIER) {
6345 parse_error_expected("while parsing member designator",
6346 T_IDENTIFIER, NULL);
6349 result->symbol = token.v.symbol;
6352 designator_t *last_designator = result;
6354 if (token.type == '.') {
6356 if (token.type != T_IDENTIFIER) {
6357 parse_error_expected("while parsing member designator",
6358 T_IDENTIFIER, NULL);
6361 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6362 designator->source_position = *HERE;
6363 designator->symbol = token.v.symbol;
6366 last_designator->next = designator;
6367 last_designator = designator;
6370 if (token.type == '[') {
6372 add_anchor_token(']');
6373 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6374 designator->source_position = *HERE;
6375 designator->array_index = parse_expression();
6376 rem_anchor_token(']');
6378 if (designator->array_index == NULL) {
6382 last_designator->next = designator;
6383 last_designator = designator;
6395 * Parse the __builtin_offsetof() expression.
6397 static expression_t *parse_offsetof(void)
6399 eat(T___builtin_offsetof);
6401 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6402 expression->base.type = type_size_t;
6405 add_anchor_token(',');
6406 type_t *type = parse_typename();
6407 rem_anchor_token(',');
6409 add_anchor_token(')');
6410 designator_t *designator = parse_designator();
6411 rem_anchor_token(')');
6414 expression->offsetofe.type = type;
6415 expression->offsetofe.designator = designator;
6418 memset(&path, 0, sizeof(path));
6419 path.top_type = type;
6420 path.path = NEW_ARR_F(type_path_entry_t, 0);
6422 descend_into_subtype(&path);
6424 if (!walk_designator(&path, designator, true)) {
6425 return create_invalid_expression();
6428 DEL_ARR_F(path.path);
6432 return create_invalid_expression();
6436 * Parses a _builtin_va_start() expression.
6438 static expression_t *parse_va_start(void)
6440 eat(T___builtin_va_start);
6442 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6445 add_anchor_token(',');
6446 expression->va_starte.ap = parse_assignment_expression();
6447 rem_anchor_token(',');
6449 expression_t *const expr = parse_assignment_expression();
6450 if (expr->kind == EXPR_REFERENCE) {
6451 declaration_t *const decl = expr->reference.declaration;
6453 return create_invalid_expression();
6454 if (decl->parent_scope == ¤t_function->scope &&
6455 decl->next == NULL) {
6456 expression->va_starte.parameter = decl;
6461 errorf(&expr->base.source_position,
6462 "second argument of 'va_start' must be last parameter of the current function");
6464 return create_invalid_expression();
6468 * Parses a _builtin_va_arg() expression.
6470 static expression_t *parse_va_arg(void)
6472 eat(T___builtin_va_arg);
6474 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6477 expression->va_arge.ap = parse_assignment_expression();
6479 expression->base.type = parse_typename();
6484 return create_invalid_expression();
6487 static expression_t *parse_builtin_symbol(void)
6489 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
6491 symbol_t *symbol = token.v.symbol;
6493 expression->builtin_symbol.symbol = symbol;
6496 type_t *type = get_builtin_symbol_type(symbol);
6497 type = automatic_type_conversion(type);
6499 expression->base.type = type;
6504 * Parses a __builtin_constant() expression.
6506 static expression_t *parse_builtin_constant(void)
6508 eat(T___builtin_constant_p);
6510 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6513 add_anchor_token(')');
6514 expression->builtin_constant.value = parse_assignment_expression();
6515 rem_anchor_token(')');
6517 expression->base.type = type_int;
6521 return create_invalid_expression();
6525 * Parses a __builtin_prefetch() expression.
6527 static expression_t *parse_builtin_prefetch(void)
6529 eat(T___builtin_prefetch);
6531 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
6534 add_anchor_token(')');
6535 expression->builtin_prefetch.adr = parse_assignment_expression();
6536 if (token.type == ',') {
6538 expression->builtin_prefetch.rw = parse_assignment_expression();
6540 if (token.type == ',') {
6542 expression->builtin_prefetch.locality = parse_assignment_expression();
6544 rem_anchor_token(')');
6546 expression->base.type = type_void;
6550 return create_invalid_expression();
6554 * Parses a __builtin_is_*() compare expression.
6556 static expression_t *parse_compare_builtin(void)
6558 expression_t *expression;
6560 switch(token.type) {
6561 case T___builtin_isgreater:
6562 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6564 case T___builtin_isgreaterequal:
6565 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6567 case T___builtin_isless:
6568 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6570 case T___builtin_islessequal:
6571 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6573 case T___builtin_islessgreater:
6574 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6576 case T___builtin_isunordered:
6577 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6580 internal_errorf(HERE, "invalid compare builtin found");
6583 expression->base.source_position = *HERE;
6587 expression->binary.left = parse_assignment_expression();
6589 expression->binary.right = parse_assignment_expression();
6592 type_t *const orig_type_left = expression->binary.left->base.type;
6593 type_t *const orig_type_right = expression->binary.right->base.type;
6595 type_t *const type_left = skip_typeref(orig_type_left);
6596 type_t *const type_right = skip_typeref(orig_type_right);
6597 if (!is_type_float(type_left) && !is_type_float(type_right)) {
6598 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6599 type_error_incompatible("invalid operands in comparison",
6600 &expression->base.source_position, orig_type_left, orig_type_right);
6603 semantic_comparison(&expression->binary);
6608 return create_invalid_expression();
6613 * Parses a __builtin_expect() expression.
6615 static expression_t *parse_builtin_expect(void)
6617 eat(T___builtin_expect);
6619 expression_t *expression
6620 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
6623 expression->binary.left = parse_assignment_expression();
6625 expression->binary.right = parse_constant_expression();
6628 expression->base.type = expression->binary.left->base.type;
6632 return create_invalid_expression();
6637 * Parses a MS assume() expression.
6639 static expression_t *parse_assume(void)
6643 expression_t *expression
6644 = allocate_expression_zero(EXPR_UNARY_ASSUME);
6647 add_anchor_token(')');
6648 expression->unary.value = parse_assignment_expression();
6649 rem_anchor_token(')');
6652 expression->base.type = type_void;
6655 return create_invalid_expression();
6659 * Return the declaration for a given label symbol or create a new one.
6661 * @param symbol the symbol of the label
6663 static declaration_t *get_label(symbol_t *symbol)
6665 declaration_t *candidate;
6666 assert(current_function != NULL);
6668 candidate = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
6669 /* if we found a local label, we already created the declaration */
6670 if (candidate != NULL) {
6671 assert(candidate->parent_scope == scope);
6675 candidate = get_declaration(symbol, NAMESPACE_LABEL);
6676 /* if we found a label in the same function, then we already created the
6678 if (candidate != NULL
6679 && candidate->parent_scope == ¤t_function->scope) {
6683 /* otherwise we need to create a new one */
6684 declaration_t *const declaration = allocate_declaration_zero();
6685 declaration->namespc = NAMESPACE_LABEL;
6686 declaration->symbol = symbol;
6688 label_push(declaration);
6694 * Parses a GNU && label address expression.
6696 static expression_t *parse_label_address(void)
6698 source_position_t source_position = token.source_position;
6700 if (token.type != T_IDENTIFIER) {
6701 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6704 symbol_t *symbol = token.v.symbol;
6707 declaration_t *label = get_label(symbol);
6710 label->address_taken = true;
6712 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6713 expression->base.source_position = source_position;
6715 /* label address is threaten as a void pointer */
6716 expression->base.type = type_void_ptr;
6717 expression->label_address.declaration = label;
6720 return create_invalid_expression();
6724 * Parse a microsoft __noop expression.
6726 static expression_t *parse_noop_expression(void)
6728 source_position_t source_position = *HERE;
6731 if (token.type == '(') {
6732 /* parse arguments */
6734 add_anchor_token(')');
6735 add_anchor_token(',');
6737 if (token.type != ')') {
6739 (void)parse_assignment_expression();
6740 if (token.type != ',')
6746 rem_anchor_token(',');
6747 rem_anchor_token(')');
6750 /* the result is a (int)0 */
6751 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6752 cnst->base.source_position = source_position;
6753 cnst->base.type = type_int;
6754 cnst->conste.v.int_value = 0;
6755 cnst->conste.is_ms_noop = true;
6760 return create_invalid_expression();
6764 * Parses a primary expression.
6766 static expression_t *parse_primary_expression(void)
6768 switch (token.type) {
6769 case T_INTEGER: return parse_int_const();
6770 case T_CHARACTER_CONSTANT: return parse_character_constant();
6771 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
6772 case T_FLOATINGPOINT: return parse_float_const();
6773 case T_STRING_LITERAL:
6774 case T_WIDE_STRING_LITERAL: return parse_string_const();
6775 case T_IDENTIFIER: return parse_reference();
6776 case T___FUNCTION__:
6777 case T___func__: return parse_function_keyword();
6778 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
6779 case T___FUNCSIG__: return parse_funcsig_keyword();
6780 case T___FUNCDNAME__: return parse_funcdname_keyword();
6781 case T___builtin_offsetof: return parse_offsetof();
6782 case T___builtin_va_start: return parse_va_start();
6783 case T___builtin_va_arg: return parse_va_arg();
6784 case T___builtin_expect:
6785 case T___builtin_alloca:
6786 case T___builtin_nan:
6787 case T___builtin_nand:
6788 case T___builtin_nanf:
6789 case T___builtin_huge_val:
6790 case T___builtin_va_end: return parse_builtin_symbol();
6791 case T___builtin_isgreater:
6792 case T___builtin_isgreaterequal:
6793 case T___builtin_isless:
6794 case T___builtin_islessequal:
6795 case T___builtin_islessgreater:
6796 case T___builtin_isunordered: return parse_compare_builtin();
6797 case T___builtin_constant_p: return parse_builtin_constant();
6798 case T___builtin_prefetch: return parse_builtin_prefetch();
6799 case T__assume: return parse_assume();
6802 return parse_label_address();
6805 case '(': return parse_parenthesized_expression();
6806 case T___noop: return parse_noop_expression();
6809 errorf(HERE, "unexpected token %K, expected an expression", &token);
6810 return create_invalid_expression();
6814 * Check if the expression has the character type and issue a warning then.
6816 static void check_for_char_index_type(const expression_t *expression)
6818 type_t *const type = expression->base.type;
6819 const type_t *const base_type = skip_typeref(type);
6821 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
6822 warning.char_subscripts) {
6823 warningf(&expression->base.source_position,
6824 "array subscript has type '%T'", type);
6828 static expression_t *parse_array_expression(unsigned precedence,
6834 add_anchor_token(']');
6836 expression_t *inside = parse_expression();
6838 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6840 array_access_expression_t *array_access = &expression->array_access;
6842 type_t *const orig_type_left = left->base.type;
6843 type_t *const orig_type_inside = inside->base.type;
6845 type_t *const type_left = skip_typeref(orig_type_left);
6846 type_t *const type_inside = skip_typeref(orig_type_inside);
6848 type_t *return_type;
6849 if (is_type_pointer(type_left)) {
6850 return_type = type_left->pointer.points_to;
6851 array_access->array_ref = left;
6852 array_access->index = inside;
6853 check_for_char_index_type(inside);
6854 } else if (is_type_pointer(type_inside)) {
6855 return_type = type_inside->pointer.points_to;
6856 array_access->array_ref = inside;
6857 array_access->index = left;
6858 array_access->flipped = true;
6859 check_for_char_index_type(left);
6861 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
6863 "array access on object with non-pointer types '%T', '%T'",
6864 orig_type_left, orig_type_inside);
6866 return_type = type_error_type;
6867 array_access->array_ref = left;
6868 array_access->index = inside;
6871 expression->base.type = automatic_type_conversion(return_type);
6873 rem_anchor_token(']');
6874 if (token.type == ']') {
6877 parse_error_expected("Problem while parsing array access", ']', NULL);
6882 static expression_t *parse_typeprop(expression_kind_t const kind,
6883 source_position_t const pos,
6884 unsigned const precedence)
6886 expression_t *tp_expression = allocate_expression_zero(kind);
6887 tp_expression->base.type = type_size_t;
6888 tp_expression->base.source_position = pos;
6890 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6892 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6894 add_anchor_token(')');
6895 type_t* const orig_type = parse_typename();
6896 tp_expression->typeprop.type = orig_type;
6898 type_t const* const type = skip_typeref(orig_type);
6899 char const* const wrong_type =
6900 is_type_incomplete(type) ? "incomplete" :
6901 type->kind == TYPE_FUNCTION ? "function designator" :
6902 type->kind == TYPE_BITFIELD ? "bitfield" :
6904 if (wrong_type != NULL) {
6905 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6906 what, wrong_type, type);
6909 rem_anchor_token(')');
6912 expression_t *expression = parse_sub_expression(precedence);
6914 type_t* const orig_type = revert_automatic_type_conversion(expression);
6915 expression->base.type = orig_type;
6917 type_t const* const type = skip_typeref(orig_type);
6918 char const* const wrong_type =
6919 is_type_incomplete(type) ? "incomplete" :
6920 type->kind == TYPE_FUNCTION ? "function designator" :
6921 type->kind == TYPE_BITFIELD ? "bitfield" :
6923 if (wrong_type != NULL) {
6924 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6927 tp_expression->typeprop.type = expression->base.type;
6928 tp_expression->typeprop.tp_expression = expression;
6931 return tp_expression;
6933 return create_invalid_expression();
6936 static expression_t *parse_sizeof(unsigned precedence)
6938 source_position_t pos = *HERE;
6940 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
6943 static expression_t *parse_alignof(unsigned precedence)
6945 source_position_t pos = *HERE;
6947 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
6950 static expression_t *parse_select_expression(unsigned precedence,
6951 expression_t *compound)
6954 assert(token.type == '.' || token.type == T_MINUSGREATER);
6956 bool is_pointer = (token.type == T_MINUSGREATER);
6959 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6960 select->select.compound = compound;
6962 if (token.type != T_IDENTIFIER) {
6963 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6966 symbol_t *symbol = token.v.symbol;
6969 type_t *const orig_type = compound->base.type;
6970 type_t *const type = skip_typeref(orig_type);
6973 bool saw_error = false;
6974 if (is_type_pointer(type)) {
6977 "request for member '%Y' in something not a struct or union, but '%T'",
6981 type_left = skip_typeref(type->pointer.points_to);
6983 if (is_pointer && is_type_valid(type)) {
6984 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
6990 declaration_t *entry;
6991 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
6992 type_left->kind == TYPE_COMPOUND_UNION) {
6993 declaration_t *const declaration = type_left->compound.declaration;
6995 if (!declaration->init.complete) {
6996 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
6998 goto create_error_entry;
7001 entry = find_compound_entry(declaration, symbol);
7002 if (entry == NULL) {
7003 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7004 goto create_error_entry;
7007 if (is_type_valid(type_left) && !saw_error) {
7009 "request for member '%Y' in something not a struct or union, but '%T'",
7013 entry = allocate_declaration_zero();
7014 entry->symbol = symbol;
7017 select->select.compound_entry = entry;
7019 type_t *const res_type =
7020 get_qualified_type(entry->type, type_left->base.qualifiers);
7022 /* we always do the auto-type conversions; the & and sizeof parser contains
7023 * code to revert this! */
7024 select->base.type = automatic_type_conversion(res_type);
7026 type_t *skipped = skip_typeref(res_type);
7027 if (skipped->kind == TYPE_BITFIELD) {
7028 select->base.type = skipped->bitfield.base_type;
7034 static void check_call_argument(const function_parameter_t *parameter,
7035 call_argument_t *argument, unsigned pos)
7037 type_t *expected_type = parameter->type;
7038 type_t *expected_type_skip = skip_typeref(expected_type);
7039 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7040 expression_t *arg_expr = argument->expression;
7041 type_t *arg_type = skip_typeref(arg_expr->base.type);
7043 /* handle transparent union gnu extension */
7044 if (is_type_union(expected_type_skip)
7045 && (expected_type_skip->base.modifiers
7046 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7047 declaration_t *union_decl = expected_type_skip->compound.declaration;
7049 declaration_t *declaration = union_decl->scope.declarations;
7050 type_t *best_type = NULL;
7051 for ( ; declaration != NULL; declaration = declaration->next) {
7052 type_t *decl_type = declaration->type;
7053 error = semantic_assign(decl_type, arg_expr);
7054 if (error == ASSIGN_ERROR_INCOMPATIBLE
7055 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7058 if (error == ASSIGN_SUCCESS) {
7059 best_type = decl_type;
7060 } else if (best_type == NULL) {
7061 best_type = decl_type;
7065 if (best_type != NULL) {
7066 expected_type = best_type;
7070 error = semantic_assign(expected_type, arg_expr);
7071 argument->expression = create_implicit_cast(argument->expression,
7074 if (error != ASSIGN_SUCCESS) {
7075 /* report exact scope in error messages (like "in argument 3") */
7077 snprintf(buf, sizeof(buf), "call argument %u", pos);
7078 report_assign_error(error, expected_type, arg_expr, buf,
7079 &arg_expr->base.source_position);
7080 } else if (warning.traditional || warning.conversion) {
7081 type_t *const promoted_type = get_default_promoted_type(arg_type);
7082 if (!types_compatible(expected_type_skip, promoted_type) &&
7083 !types_compatible(expected_type_skip, type_void_ptr) &&
7084 !types_compatible(type_void_ptr, promoted_type)) {
7085 /* Deliberately show the skipped types in this warning */
7086 warningf(&arg_expr->base.source_position,
7087 "passing call argument %u as '%T' rather than '%T' due to prototype",
7088 pos, expected_type_skip, promoted_type);
7094 * Parse a call expression, ie. expression '( ... )'.
7096 * @param expression the function address
7098 static expression_t *parse_call_expression(unsigned precedence,
7099 expression_t *expression)
7102 expression_t *result = allocate_expression_zero(EXPR_CALL);
7103 result->base.source_position = expression->base.source_position;
7105 call_expression_t *call = &result->call;
7106 call->function = expression;
7108 type_t *const orig_type = expression->base.type;
7109 type_t *const type = skip_typeref(orig_type);
7111 function_type_t *function_type = NULL;
7112 if (is_type_pointer(type)) {
7113 type_t *const to_type = skip_typeref(type->pointer.points_to);
7115 if (is_type_function(to_type)) {
7116 function_type = &to_type->function;
7117 call->base.type = function_type->return_type;
7121 if (function_type == NULL && is_type_valid(type)) {
7122 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7125 /* parse arguments */
7127 add_anchor_token(')');
7128 add_anchor_token(',');
7130 if (token.type != ')') {
7131 call_argument_t *last_argument = NULL;
7134 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7136 argument->expression = parse_assignment_expression();
7137 if (last_argument == NULL) {
7138 call->arguments = argument;
7140 last_argument->next = argument;
7142 last_argument = argument;
7144 if (token.type != ',')
7149 rem_anchor_token(',');
7150 rem_anchor_token(')');
7153 if (function_type == NULL)
7156 function_parameter_t *parameter = function_type->parameters;
7157 call_argument_t *argument = call->arguments;
7158 if (!function_type->unspecified_parameters) {
7159 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7160 parameter = parameter->next, argument = argument->next) {
7161 check_call_argument(parameter, argument, ++pos);
7164 if (parameter != NULL) {
7165 errorf(HERE, "too few arguments to function '%E'", expression);
7166 } else if (argument != NULL && !function_type->variadic) {
7167 errorf(HERE, "too many arguments to function '%E'", expression);
7171 /* do default promotion */
7172 for( ; argument != NULL; argument = argument->next) {
7173 type_t *type = argument->expression->base.type;
7175 type = get_default_promoted_type(type);
7177 argument->expression
7178 = create_implicit_cast(argument->expression, type);
7181 check_format(&result->call);
7183 if (warning.aggregate_return &&
7184 is_type_compound(skip_typeref(function_type->return_type))) {
7185 warningf(&result->base.source_position,
7186 "function call has aggregate value");
7191 return create_invalid_expression();
7194 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7196 static bool same_compound_type(const type_t *type1, const type_t *type2)
7199 is_type_compound(type1) &&
7200 type1->kind == type2->kind &&
7201 type1->compound.declaration == type2->compound.declaration;
7205 * Parse a conditional expression, ie. 'expression ? ... : ...'.
7207 * @param expression the conditional expression
7209 static expression_t *parse_conditional_expression(unsigned precedence,
7210 expression_t *expression)
7212 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7214 conditional_expression_t *conditional = &result->conditional;
7215 conditional->base.source_position = *HERE;
7216 conditional->condition = expression;
7219 add_anchor_token(':');
7222 type_t *const condition_type_orig = expression->base.type;
7223 type_t *const condition_type = skip_typeref(condition_type_orig);
7224 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
7225 type_error("expected a scalar type in conditional condition",
7226 &expression->base.source_position, condition_type_orig);
7229 expression_t *true_expression = expression;
7230 bool gnu_cond = false;
7231 if ((c_mode & _GNUC) && token.type == ':') {
7234 true_expression = parse_expression();
7235 rem_anchor_token(':');
7237 expression_t *false_expression = parse_sub_expression(precedence);
7239 type_t *const orig_true_type = true_expression->base.type;
7240 type_t *const orig_false_type = false_expression->base.type;
7241 type_t *const true_type = skip_typeref(orig_true_type);
7242 type_t *const false_type = skip_typeref(orig_false_type);
7245 type_t *result_type;
7246 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7247 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7248 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
7249 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7250 warningf(&conditional->base.source_position,
7251 "ISO C forbids conditional expression with only one void side");
7253 result_type = type_void;
7254 } else if (is_type_arithmetic(true_type)
7255 && is_type_arithmetic(false_type)) {
7256 result_type = semantic_arithmetic(true_type, false_type);
7258 true_expression = create_implicit_cast(true_expression, result_type);
7259 false_expression = create_implicit_cast(false_expression, result_type);
7261 conditional->true_expression = true_expression;
7262 conditional->false_expression = false_expression;
7263 conditional->base.type = result_type;
7264 } else if (same_compound_type(true_type, false_type)) {
7265 /* just take 1 of the 2 types */
7266 result_type = true_type;
7267 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7268 type_t *pointer_type;
7270 expression_t *other_expression;
7271 if (is_type_pointer(true_type) &&
7272 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7273 pointer_type = true_type;
7274 other_type = false_type;
7275 other_expression = false_expression;
7277 pointer_type = false_type;
7278 other_type = true_type;
7279 other_expression = true_expression;
7282 if (is_null_pointer_constant(other_expression)) {
7283 result_type = pointer_type;
7284 } else if (is_type_pointer(other_type)) {
7285 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7286 type_t *to2 = skip_typeref(other_type->pointer.points_to);
7289 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7290 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7292 } else if (types_compatible(get_unqualified_type(to1),
7293 get_unqualified_type(to2))) {
7296 warningf(&conditional->base.source_position,
7297 "pointer types '%T' and '%T' in conditional expression are incompatible",
7298 true_type, false_type);
7302 type_t *const type =
7303 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7304 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7305 } else if (is_type_integer(other_type)) {
7306 warningf(&conditional->base.source_position,
7307 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7308 result_type = pointer_type;
7310 type_error_incompatible("while parsing conditional",
7311 &expression->base.source_position, true_type, false_type);
7312 result_type = type_error_type;
7315 /* TODO: one pointer to void*, other some pointer */
7317 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7318 type_error_incompatible("while parsing conditional",
7319 &conditional->base.source_position, true_type,
7322 result_type = type_error_type;
7325 conditional->true_expression
7326 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7327 conditional->false_expression
7328 = create_implicit_cast(false_expression, result_type);
7329 conditional->base.type = result_type;
7332 return create_invalid_expression();
7336 * Parse an extension expression.
7338 static expression_t *parse_extension(unsigned precedence)
7340 eat(T___extension__);
7342 /* TODO enable extensions */
7343 expression_t *expression = parse_sub_expression(precedence);
7344 /* TODO disable extensions */
7349 * Parse a __builtin_classify_type() expression.
7351 static expression_t *parse_builtin_classify_type(const unsigned precedence)
7353 eat(T___builtin_classify_type);
7355 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7356 result->base.type = type_int;
7359 add_anchor_token(')');
7360 expression_t *expression = parse_sub_expression(precedence);
7361 rem_anchor_token(')');
7363 result->classify_type.type_expression = expression;
7367 return create_invalid_expression();
7370 static bool check_pointer_arithmetic(const source_position_t *source_position,
7371 type_t *pointer_type,
7372 type_t *orig_pointer_type)
7374 type_t *points_to = pointer_type->pointer.points_to;
7375 points_to = skip_typeref(points_to);
7377 if (is_type_incomplete(points_to)) {
7378 if (!(c_mode & _GNUC) || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7379 errorf(source_position,
7380 "arithmetic with pointer to incomplete type '%T' not allowed",
7383 } else if (warning.pointer_arith) {
7384 warningf(source_position,
7385 "pointer of type '%T' used in arithmetic",
7388 } else if (is_type_function(points_to)) {
7389 if (!(c_mode && _GNUC)) {
7390 errorf(source_position,
7391 "arithmetic with pointer to function type '%T' not allowed",
7394 } else if (warning.pointer_arith) {
7395 warningf(source_position,
7396 "pointer to a function '%T' used in arithmetic",
7403 static bool is_lvalue(const expression_t *expression)
7405 switch (expression->kind) {
7406 case EXPR_REFERENCE:
7407 case EXPR_ARRAY_ACCESS:
7409 case EXPR_UNARY_DEREFERENCE:
7417 static void semantic_incdec(unary_expression_t *expression)
7419 type_t *const orig_type = expression->value->base.type;
7420 type_t *const type = skip_typeref(orig_type);
7421 if (is_type_pointer(type)) {
7422 if (!check_pointer_arithmetic(&expression->base.source_position,
7426 } else if (!is_type_real(type) && is_type_valid(type)) {
7427 /* TODO: improve error message */
7428 errorf(&expression->base.source_position,
7429 "operation needs an arithmetic or pointer type");
7432 if (!is_lvalue(expression->value)) {
7433 /* TODO: improve error message */
7434 errorf(&expression->base.source_position, "lvalue required as operand");
7436 expression->base.type = orig_type;
7439 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7441 type_t *const orig_type = expression->value->base.type;
7442 type_t *const type = skip_typeref(orig_type);
7443 if (!is_type_arithmetic(type)) {
7444 if (is_type_valid(type)) {
7445 /* TODO: improve error message */
7446 errorf(&expression->base.source_position,
7447 "operation needs an arithmetic type");
7452 expression->base.type = orig_type;
7455 static void semantic_unexpr_plus(unary_expression_t *expression)
7457 semantic_unexpr_arithmetic(expression);
7458 if (warning.traditional)
7459 warningf(&expression->base.source_position,
7460 "traditional C rejects the unary plus operator");
7463 static void semantic_not(unary_expression_t *expression)
7465 type_t *const orig_type = expression->value->base.type;
7466 type_t *const type = skip_typeref(orig_type);
7467 if (!is_type_scalar(type) && is_type_valid(type)) {
7468 errorf(&expression->base.source_position,
7469 "operand of ! must be of scalar type");
7472 expression->base.type = type_int;
7475 static void semantic_unexpr_integer(unary_expression_t *expression)
7477 type_t *const orig_type = expression->value->base.type;
7478 type_t *const type = skip_typeref(orig_type);
7479 if (!is_type_integer(type)) {
7480 if (is_type_valid(type)) {
7481 errorf(&expression->base.source_position,
7482 "operand of ~ must be of integer type");
7487 expression->base.type = orig_type;
7490 static void semantic_dereference(unary_expression_t *expression)
7492 type_t *const orig_type = expression->value->base.type;
7493 type_t *const type = skip_typeref(orig_type);
7494 if (!is_type_pointer(type)) {
7495 if (is_type_valid(type)) {
7496 errorf(&expression->base.source_position,
7497 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7502 type_t *result_type = type->pointer.points_to;
7503 result_type = automatic_type_conversion(result_type);
7504 expression->base.type = result_type;
7508 * Record that an address is taken (expression represents an lvalue).
7510 * @param expression the expression
7511 * @param may_be_register if true, the expression might be an register
7513 static void set_address_taken(expression_t *expression, bool may_be_register)
7515 if (expression->kind != EXPR_REFERENCE)
7518 declaration_t *const declaration = expression->reference.declaration;
7519 /* happens for parse errors */
7520 if (declaration == NULL)
7523 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
7524 errorf(&expression->base.source_position,
7525 "address of register variable '%Y' requested",
7526 declaration->symbol);
7528 declaration->address_taken = 1;
7533 * Check the semantic of the address taken expression.
7535 static void semantic_take_addr(unary_expression_t *expression)
7537 expression_t *value = expression->value;
7538 value->base.type = revert_automatic_type_conversion(value);
7540 type_t *orig_type = value->base.type;
7541 if (!is_type_valid(orig_type))
7544 set_address_taken(value, false);
7546 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7549 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
7550 static expression_t *parse_##unexpression_type(unsigned precedence) \
7552 expression_t *unary_expression \
7553 = allocate_expression_zero(unexpression_type); \
7554 unary_expression->base.source_position = *HERE; \
7556 unary_expression->unary.value = parse_sub_expression(precedence); \
7558 sfunc(&unary_expression->unary); \
7560 return unary_expression; \
7563 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7564 semantic_unexpr_arithmetic)
7565 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7566 semantic_unexpr_plus)
7567 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7569 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7570 semantic_dereference)
7571 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7573 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7574 semantic_unexpr_integer)
7575 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
7577 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7580 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7582 static expression_t *parse_##unexpression_type(unsigned precedence, \
7583 expression_t *left) \
7585 (void) precedence; \
7587 expression_t *unary_expression \
7588 = allocate_expression_zero(unexpression_type); \
7589 unary_expression->base.source_position = *HERE; \
7591 unary_expression->unary.value = left; \
7593 sfunc(&unary_expression->unary); \
7595 return unary_expression; \
7598 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7599 EXPR_UNARY_POSTFIX_INCREMENT,
7601 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7602 EXPR_UNARY_POSTFIX_DECREMENT,
7605 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7607 /* TODO: handle complex + imaginary types */
7609 type_left = get_unqualified_type(type_left);
7610 type_right = get_unqualified_type(type_right);
7612 /* § 6.3.1.8 Usual arithmetic conversions */
7613 if (type_left == type_long_double || type_right == type_long_double) {
7614 return type_long_double;
7615 } else if (type_left == type_double || type_right == type_double) {
7617 } else if (type_left == type_float || type_right == type_float) {
7621 type_left = promote_integer(type_left);
7622 type_right = promote_integer(type_right);
7624 if (type_left == type_right)
7627 bool const signed_left = is_type_signed(type_left);
7628 bool const signed_right = is_type_signed(type_right);
7629 int const rank_left = get_rank(type_left);
7630 int const rank_right = get_rank(type_right);
7632 if (signed_left == signed_right)
7633 return rank_left >= rank_right ? type_left : type_right;
7642 u_rank = rank_right;
7643 u_type = type_right;
7645 s_rank = rank_right;
7646 s_type = type_right;
7651 if (u_rank >= s_rank)
7654 /* casting rank to atomic_type_kind is a bit hacky, but makes things
7656 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
7657 > get_atomic_type_size((atomic_type_kind_t) u_rank))
7661 case ATOMIC_TYPE_INT: return type_unsigned_int;
7662 case ATOMIC_TYPE_LONG: return type_unsigned_long;
7663 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
7665 default: panic("invalid atomic type");
7670 * Check the semantic restrictions for a binary expression.
7672 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
7674 expression_t *const left = expression->left;
7675 expression_t *const right = expression->right;
7676 type_t *const orig_type_left = left->base.type;
7677 type_t *const orig_type_right = right->base.type;
7678 type_t *const type_left = skip_typeref(orig_type_left);
7679 type_t *const type_right = skip_typeref(orig_type_right);
7681 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7682 /* TODO: improve error message */
7683 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7684 errorf(&expression->base.source_position,
7685 "operation needs arithmetic types");
7690 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7691 expression->left = create_implicit_cast(left, arithmetic_type);
7692 expression->right = create_implicit_cast(right, arithmetic_type);
7693 expression->base.type = arithmetic_type;
7696 static void warn_div_by_zero(binary_expression_t const *const expression)
7698 if (!warning.div_by_zero ||
7699 !is_type_integer(expression->base.type))
7702 expression_t const *const right = expression->right;
7703 /* The type of the right operand can be different for /= */
7704 if (is_type_integer(right->base.type) &&
7705 is_constant_expression(right) &&
7706 fold_constant(right) == 0) {
7707 warningf(&expression->base.source_position, "division by zero");
7712 * Check the semantic restrictions for a div/mod expression.
7714 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
7715 semantic_binexpr_arithmetic(expression);
7716 warn_div_by_zero(expression);
7719 static void semantic_shift_op(binary_expression_t *expression)
7721 expression_t *const left = expression->left;
7722 expression_t *const right = expression->right;
7723 type_t *const orig_type_left = left->base.type;
7724 type_t *const orig_type_right = right->base.type;
7725 type_t * type_left = skip_typeref(orig_type_left);
7726 type_t * type_right = skip_typeref(orig_type_right);
7728 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
7729 /* TODO: improve error message */
7730 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7731 errorf(&expression->base.source_position,
7732 "operands of shift operation must have integer types");
7737 type_left = promote_integer(type_left);
7738 type_right = promote_integer(type_right);
7740 expression->left = create_implicit_cast(left, type_left);
7741 expression->right = create_implicit_cast(right, type_right);
7742 expression->base.type = type_left;
7745 static void semantic_add(binary_expression_t *expression)
7747 expression_t *const left = expression->left;
7748 expression_t *const right = expression->right;
7749 type_t *const orig_type_left = left->base.type;
7750 type_t *const orig_type_right = right->base.type;
7751 type_t *const type_left = skip_typeref(orig_type_left);
7752 type_t *const type_right = skip_typeref(orig_type_right);
7755 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7756 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7757 expression->left = create_implicit_cast(left, arithmetic_type);
7758 expression->right = create_implicit_cast(right, arithmetic_type);
7759 expression->base.type = arithmetic_type;
7761 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7762 check_pointer_arithmetic(&expression->base.source_position,
7763 type_left, orig_type_left);
7764 expression->base.type = type_left;
7765 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
7766 check_pointer_arithmetic(&expression->base.source_position,
7767 type_right, orig_type_right);
7768 expression->base.type = type_right;
7769 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7770 errorf(&expression->base.source_position,
7771 "invalid operands to binary + ('%T', '%T')",
7772 orig_type_left, orig_type_right);
7776 static void semantic_sub(binary_expression_t *expression)
7778 expression_t *const left = expression->left;
7779 expression_t *const right = expression->right;
7780 type_t *const orig_type_left = left->base.type;
7781 type_t *const orig_type_right = right->base.type;
7782 type_t *const type_left = skip_typeref(orig_type_left);
7783 type_t *const type_right = skip_typeref(orig_type_right);
7784 source_position_t const *const pos = &expression->base.source_position;
7787 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7788 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7789 expression->left = create_implicit_cast(left, arithmetic_type);
7790 expression->right = create_implicit_cast(right, arithmetic_type);
7791 expression->base.type = arithmetic_type;
7793 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7794 check_pointer_arithmetic(&expression->base.source_position,
7795 type_left, orig_type_left);
7796 expression->base.type = type_left;
7797 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7798 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
7799 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
7800 if (!types_compatible(unqual_left, unqual_right)) {
7802 "subtracting pointers to incompatible types '%T' and '%T'",
7803 orig_type_left, orig_type_right);
7804 } else if (!is_type_object(unqual_left)) {
7805 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
7806 warningf(pos, "subtracting pointers to void");
7808 errorf(pos, "subtracting pointers to non-object types '%T'",
7812 expression->base.type = type_ptrdiff_t;
7813 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7814 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
7815 orig_type_left, orig_type_right);
7820 * Check the semantics of comparison expressions.
7822 * @param expression The expression to check.
7824 static void semantic_comparison(binary_expression_t *expression)
7826 expression_t *left = expression->left;
7827 expression_t *right = expression->right;
7828 type_t *orig_type_left = left->base.type;
7829 type_t *orig_type_right = right->base.type;
7831 type_t *type_left = skip_typeref(orig_type_left);
7832 type_t *type_right = skip_typeref(orig_type_right);
7834 /* TODO non-arithmetic types */
7835 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7836 /* test for signed vs unsigned compares */
7837 if (warning.sign_compare &&
7838 (expression->base.kind != EXPR_BINARY_EQUAL &&
7839 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
7840 (is_type_signed(type_left) != is_type_signed(type_right))) {
7842 /* check if 1 of the operands is a constant, in this case we just
7843 * check wether we can safely represent the resulting constant in
7844 * the type of the other operand. */
7845 expression_t *const_expr = NULL;
7846 expression_t *other_expr = NULL;
7848 if (is_constant_expression(left)) {
7851 } else if (is_constant_expression(right)) {
7856 if (const_expr != NULL) {
7857 type_t *other_type = skip_typeref(other_expr->base.type);
7858 long val = fold_constant(const_expr);
7859 /* TODO: check if val can be represented by other_type */
7863 warningf(&expression->base.source_position,
7864 "comparison between signed and unsigned");
7866 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7867 expression->left = create_implicit_cast(left, arithmetic_type);
7868 expression->right = create_implicit_cast(right, arithmetic_type);
7869 expression->base.type = arithmetic_type;
7870 if (warning.float_equal &&
7871 (expression->base.kind == EXPR_BINARY_EQUAL ||
7872 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
7873 is_type_float(arithmetic_type)) {
7874 warningf(&expression->base.source_position,
7875 "comparing floating point with == or != is unsafe");
7877 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7878 /* TODO check compatibility */
7879 } else if (is_type_pointer(type_left)) {
7880 expression->right = create_implicit_cast(right, type_left);
7881 } else if (is_type_pointer(type_right)) {
7882 expression->left = create_implicit_cast(left, type_right);
7883 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7884 type_error_incompatible("invalid operands in comparison",
7885 &expression->base.source_position,
7886 type_left, type_right);
7888 expression->base.type = type_int;
7892 * Checks if a compound type has constant fields.
7894 static bool has_const_fields(const compound_type_t *type)
7896 const scope_t *scope = &type->declaration->scope;
7897 const declaration_t *declaration = scope->declarations;
7899 for (; declaration != NULL; declaration = declaration->next) {
7900 if (declaration->namespc != NAMESPACE_NORMAL)
7903 const type_t *decl_type = skip_typeref(declaration->type);
7904 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
7911 static bool is_valid_assignment_lhs(expression_t const* const left)
7913 type_t *const orig_type_left = revert_automatic_type_conversion(left);
7914 type_t *const type_left = skip_typeref(orig_type_left);
7916 if (!is_lvalue(left)) {
7917 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
7922 if (is_type_array(type_left)) {
7923 errorf(HERE, "cannot assign to arrays ('%E')", left);
7926 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
7927 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
7931 if (is_type_incomplete(type_left)) {
7932 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
7933 left, orig_type_left);
7936 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
7937 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
7938 left, orig_type_left);
7945 static void semantic_arithmetic_assign(binary_expression_t *expression)
7947 expression_t *left = expression->left;
7948 expression_t *right = expression->right;
7949 type_t *orig_type_left = left->base.type;
7950 type_t *orig_type_right = right->base.type;
7952 if (!is_valid_assignment_lhs(left))
7955 type_t *type_left = skip_typeref(orig_type_left);
7956 type_t *type_right = skip_typeref(orig_type_right);
7958 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7959 /* TODO: improve error message */
7960 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7961 errorf(&expression->base.source_position,
7962 "operation needs arithmetic types");
7967 /* combined instructions are tricky. We can't create an implicit cast on
7968 * the left side, because we need the uncasted form for the store.
7969 * The ast2firm pass has to know that left_type must be right_type
7970 * for the arithmetic operation and create a cast by itself */
7971 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7972 expression->right = create_implicit_cast(right, arithmetic_type);
7973 expression->base.type = type_left;
7976 static void semantic_divmod_assign(binary_expression_t *expression)
7978 semantic_arithmetic_assign(expression);
7979 warn_div_by_zero(expression);
7982 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
7984 expression_t *const left = expression->left;
7985 expression_t *const right = expression->right;
7986 type_t *const orig_type_left = left->base.type;
7987 type_t *const orig_type_right = right->base.type;
7988 type_t *const type_left = skip_typeref(orig_type_left);
7989 type_t *const type_right = skip_typeref(orig_type_right);
7991 if (!is_valid_assignment_lhs(left))
7994 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7995 /* combined instructions are tricky. We can't create an implicit cast on
7996 * the left side, because we need the uncasted form for the store.
7997 * The ast2firm pass has to know that left_type must be right_type
7998 * for the arithmetic operation and create a cast by itself */
7999 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8000 expression->right = create_implicit_cast(right, arithmetic_type);
8001 expression->base.type = type_left;
8002 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8003 check_pointer_arithmetic(&expression->base.source_position,
8004 type_left, orig_type_left);
8005 expression->base.type = type_left;
8006 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8007 errorf(&expression->base.source_position,
8008 "incompatible types '%T' and '%T' in assignment",
8009 orig_type_left, orig_type_right);
8014 * Check the semantic restrictions of a logical expression.
8016 static void semantic_logical_op(binary_expression_t *expression)
8018 expression_t *const left = expression->left;
8019 expression_t *const right = expression->right;
8020 type_t *const orig_type_left = left->base.type;
8021 type_t *const orig_type_right = right->base.type;
8022 type_t *const type_left = skip_typeref(orig_type_left);
8023 type_t *const type_right = skip_typeref(orig_type_right);
8025 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
8026 /* TODO: improve error message */
8027 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8028 errorf(&expression->base.source_position,
8029 "operation needs scalar types");
8034 expression->base.type = type_int;
8038 * Check the semantic restrictions of a binary assign expression.
8040 static void semantic_binexpr_assign(binary_expression_t *expression)
8042 expression_t *left = expression->left;
8043 type_t *orig_type_left = left->base.type;
8045 if (!is_valid_assignment_lhs(left))
8048 assign_error_t error = semantic_assign(orig_type_left, expression->right);
8049 report_assign_error(error, orig_type_left, expression->right,
8050 "assignment", &left->base.source_position);
8051 expression->right = create_implicit_cast(expression->right, orig_type_left);
8052 expression->base.type = orig_type_left;
8056 * Determine if the outermost operation (or parts thereof) of the given
8057 * expression has no effect in order to generate a warning about this fact.
8058 * Therefore in some cases this only examines some of the operands of the
8059 * expression (see comments in the function and examples below).
8061 * f() + 23; // warning, because + has no effect
8062 * x || f(); // no warning, because x controls execution of f()
8063 * x ? y : f(); // warning, because y has no effect
8064 * (void)x; // no warning to be able to suppress the warning
8065 * This function can NOT be used for an "expression has definitely no effect"-
8067 static bool expression_has_effect(const expression_t *const expr)
8069 switch (expr->kind) {
8070 case EXPR_UNKNOWN: break;
8071 case EXPR_INVALID: return true; /* do NOT warn */
8072 case EXPR_REFERENCE: return false;
8073 /* suppress the warning for microsoft __noop operations */
8074 case EXPR_CONST: return expr->conste.is_ms_noop;
8075 case EXPR_CHARACTER_CONSTANT: return false;
8076 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
8077 case EXPR_STRING_LITERAL: return false;
8078 case EXPR_WIDE_STRING_LITERAL: return false;
8079 case EXPR_LABEL_ADDRESS: return false;
8082 const call_expression_t *const call = &expr->call;
8083 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
8086 switch (call->function->builtin_symbol.symbol->ID) {
8087 case T___builtin_va_end: return true;
8088 default: return false;
8092 /* Generate the warning if either the left or right hand side of a
8093 * conditional expression has no effect */
8094 case EXPR_CONDITIONAL: {
8095 const conditional_expression_t *const cond = &expr->conditional;
8097 expression_has_effect(cond->true_expression) &&
8098 expression_has_effect(cond->false_expression);
8101 case EXPR_SELECT: return false;
8102 case EXPR_ARRAY_ACCESS: return false;
8103 case EXPR_SIZEOF: return false;
8104 case EXPR_CLASSIFY_TYPE: return false;
8105 case EXPR_ALIGNOF: return false;
8107 case EXPR_FUNCNAME: return false;
8108 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
8109 case EXPR_BUILTIN_CONSTANT_P: return false;
8110 case EXPR_BUILTIN_PREFETCH: return true;
8111 case EXPR_OFFSETOF: return false;
8112 case EXPR_VA_START: return true;
8113 case EXPR_VA_ARG: return true;
8114 case EXPR_STATEMENT: return true; // TODO
8115 case EXPR_COMPOUND_LITERAL: return false;
8117 case EXPR_UNARY_NEGATE: return false;
8118 case EXPR_UNARY_PLUS: return false;
8119 case EXPR_UNARY_BITWISE_NEGATE: return false;
8120 case EXPR_UNARY_NOT: return false;
8121 case EXPR_UNARY_DEREFERENCE: return false;
8122 case EXPR_UNARY_TAKE_ADDRESS: return false;
8123 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
8124 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
8125 case EXPR_UNARY_PREFIX_INCREMENT: return true;
8126 case EXPR_UNARY_PREFIX_DECREMENT: return true;
8128 /* Treat void casts as if they have an effect in order to being able to
8129 * suppress the warning */
8130 case EXPR_UNARY_CAST: {
8131 type_t *const type = skip_typeref(expr->base.type);
8132 return is_type_atomic(type, ATOMIC_TYPE_VOID);
8135 case EXPR_UNARY_CAST_IMPLICIT: return true;
8136 case EXPR_UNARY_ASSUME: return true;
8138 case EXPR_BINARY_ADD: return false;
8139 case EXPR_BINARY_SUB: return false;
8140 case EXPR_BINARY_MUL: return false;
8141 case EXPR_BINARY_DIV: return false;
8142 case EXPR_BINARY_MOD: return false;
8143 case EXPR_BINARY_EQUAL: return false;
8144 case EXPR_BINARY_NOTEQUAL: return false;
8145 case EXPR_BINARY_LESS: return false;
8146 case EXPR_BINARY_LESSEQUAL: return false;
8147 case EXPR_BINARY_GREATER: return false;
8148 case EXPR_BINARY_GREATEREQUAL: return false;
8149 case EXPR_BINARY_BITWISE_AND: return false;
8150 case EXPR_BINARY_BITWISE_OR: return false;
8151 case EXPR_BINARY_BITWISE_XOR: return false;
8152 case EXPR_BINARY_SHIFTLEFT: return false;
8153 case EXPR_BINARY_SHIFTRIGHT: return false;
8154 case EXPR_BINARY_ASSIGN: return true;
8155 case EXPR_BINARY_MUL_ASSIGN: return true;
8156 case EXPR_BINARY_DIV_ASSIGN: return true;
8157 case EXPR_BINARY_MOD_ASSIGN: return true;
8158 case EXPR_BINARY_ADD_ASSIGN: return true;
8159 case EXPR_BINARY_SUB_ASSIGN: return true;
8160 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
8161 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
8162 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8163 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8164 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
8166 /* Only examine the right hand side of && and ||, because the left hand
8167 * side already has the effect of controlling the execution of the right
8169 case EXPR_BINARY_LOGICAL_AND:
8170 case EXPR_BINARY_LOGICAL_OR:
8171 /* Only examine the right hand side of a comma expression, because the left
8172 * hand side has a separate warning */
8173 case EXPR_BINARY_COMMA:
8174 return expression_has_effect(expr->binary.right);
8176 case EXPR_BINARY_BUILTIN_EXPECT: return true;
8177 case EXPR_BINARY_ISGREATER: return false;
8178 case EXPR_BINARY_ISGREATEREQUAL: return false;
8179 case EXPR_BINARY_ISLESS: return false;
8180 case EXPR_BINARY_ISLESSEQUAL: return false;
8181 case EXPR_BINARY_ISLESSGREATER: return false;
8182 case EXPR_BINARY_ISUNORDERED: return false;
8185 internal_errorf(HERE, "unexpected expression");
8188 static void semantic_comma(binary_expression_t *expression)
8190 if (warning.unused_value) {
8191 const expression_t *const left = expression->left;
8192 if (!expression_has_effect(left)) {
8193 warningf(&left->base.source_position,
8194 "left-hand operand of comma expression has no effect");
8197 expression->base.type = expression->right->base.type;
8200 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
8201 static expression_t *parse_##binexpression_type(unsigned precedence, \
8202 expression_t *left) \
8204 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8205 binexpr->base.source_position = *HERE; \
8206 binexpr->binary.left = left; \
8209 expression_t *right = parse_sub_expression(precedence + lr); \
8211 binexpr->binary.right = right; \
8212 sfunc(&binexpr->binary); \
8217 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
8218 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
8219 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_divmod_arithmetic, 1)
8220 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_divmod_arithmetic, 1)
8221 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
8222 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
8223 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
8224 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
8225 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
8227 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
8228 semantic_comparison, 1)
8229 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
8230 semantic_comparison, 1)
8231 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
8232 semantic_comparison, 1)
8233 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
8234 semantic_comparison, 1)
8236 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
8237 semantic_binexpr_arithmetic, 1)
8238 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
8239 semantic_binexpr_arithmetic, 1)
8240 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
8241 semantic_binexpr_arithmetic, 1)
8242 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
8243 semantic_logical_op, 1)
8244 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
8245 semantic_logical_op, 1)
8246 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
8247 semantic_shift_op, 1)
8248 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
8249 semantic_shift_op, 1)
8250 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
8251 semantic_arithmetic_addsubb_assign, 0)
8252 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
8253 semantic_arithmetic_addsubb_assign, 0)
8254 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
8255 semantic_arithmetic_assign, 0)
8256 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
8257 semantic_divmod_assign, 0)
8258 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
8259 semantic_divmod_assign, 0)
8260 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
8261 semantic_arithmetic_assign, 0)
8262 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8263 semantic_arithmetic_assign, 0)
8264 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
8265 semantic_arithmetic_assign, 0)
8266 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
8267 semantic_arithmetic_assign, 0)
8268 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
8269 semantic_arithmetic_assign, 0)
8271 static expression_t *parse_sub_expression(unsigned precedence)
8273 if (token.type < 0) {
8274 return expected_expression_error();
8277 expression_parser_function_t *parser
8278 = &expression_parsers[token.type];
8279 source_position_t source_position = token.source_position;
8282 if (parser->parser != NULL) {
8283 left = parser->parser(parser->precedence);
8285 left = parse_primary_expression();
8287 assert(left != NULL);
8288 left->base.source_position = source_position;
8291 if (token.type < 0) {
8292 return expected_expression_error();
8295 parser = &expression_parsers[token.type];
8296 if (parser->infix_parser == NULL)
8298 if (parser->infix_precedence < precedence)
8301 left = parser->infix_parser(parser->infix_precedence, left);
8303 assert(left != NULL);
8304 assert(left->kind != EXPR_UNKNOWN);
8305 left->base.source_position = source_position;
8312 * Parse an expression.
8314 static expression_t *parse_expression(void)
8316 return parse_sub_expression(1);
8320 * Register a parser for a prefix-like operator with given precedence.
8322 * @param parser the parser function
8323 * @param token_type the token type of the prefix token
8324 * @param precedence the precedence of the operator
8326 static void register_expression_parser(parse_expression_function parser,
8327 int token_type, unsigned precedence)
8329 expression_parser_function_t *entry = &expression_parsers[token_type];
8331 if (entry->parser != NULL) {
8332 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8333 panic("trying to register multiple expression parsers for a token");
8335 entry->parser = parser;
8336 entry->precedence = precedence;
8340 * Register a parser for an infix operator with given precedence.
8342 * @param parser the parser function
8343 * @param token_type the token type of the infix operator
8344 * @param precedence the precedence of the operator
8346 static void register_infix_parser(parse_expression_infix_function parser,
8347 int token_type, unsigned precedence)
8349 expression_parser_function_t *entry = &expression_parsers[token_type];
8351 if (entry->infix_parser != NULL) {
8352 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8353 panic("trying to register multiple infix expression parsers for a "
8356 entry->infix_parser = parser;
8357 entry->infix_precedence = precedence;
8361 * Initialize the expression parsers.
8363 static void init_expression_parsers(void)
8365 memset(&expression_parsers, 0, sizeof(expression_parsers));
8367 register_infix_parser(parse_array_expression, '[', 30);
8368 register_infix_parser(parse_call_expression, '(', 30);
8369 register_infix_parser(parse_select_expression, '.', 30);
8370 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
8371 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
8373 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
8376 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
8377 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
8378 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
8379 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
8380 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
8381 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
8382 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
8383 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
8384 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
8385 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
8386 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
8387 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
8388 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
8389 T_EXCLAMATIONMARKEQUAL, 13);
8390 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
8391 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
8392 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
8393 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
8394 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
8395 register_infix_parser(parse_conditional_expression, '?', 7);
8396 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
8397 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
8398 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
8399 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
8400 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
8401 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
8402 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
8403 T_LESSLESSEQUAL, 2);
8404 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8405 T_GREATERGREATEREQUAL, 2);
8406 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
8408 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
8410 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
8413 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
8415 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
8416 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
8417 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
8418 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
8419 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
8420 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
8421 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
8423 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
8425 register_expression_parser(parse_sizeof, T_sizeof, 25);
8426 register_expression_parser(parse_alignof, T___alignof__, 25);
8427 register_expression_parser(parse_extension, T___extension__, 25);
8428 register_expression_parser(parse_builtin_classify_type,
8429 T___builtin_classify_type, 25);
8433 * Parse a asm statement arguments specification.
8435 static asm_argument_t *parse_asm_arguments(bool is_out)
8437 asm_argument_t *result = NULL;
8438 asm_argument_t *last = NULL;
8440 while (token.type == T_STRING_LITERAL || token.type == '[') {
8441 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8442 memset(argument, 0, sizeof(argument[0]));
8444 if (token.type == '[') {
8446 if (token.type != T_IDENTIFIER) {
8447 parse_error_expected("while parsing asm argument",
8448 T_IDENTIFIER, NULL);
8451 argument->symbol = token.v.symbol;
8456 argument->constraints = parse_string_literals();
8458 add_anchor_token(')');
8459 expression_t *expression = parse_expression();
8460 rem_anchor_token(')');
8462 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
8463 * change size or type representation (e.g. int -> long is ok, but
8464 * int -> float is not) */
8465 if (expression->kind == EXPR_UNARY_CAST) {
8466 type_t *const type = expression->base.type;
8467 type_kind_t const kind = type->kind;
8468 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8471 if (kind == TYPE_ATOMIC) {
8472 atomic_type_kind_t const akind = type->atomic.akind;
8473 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8474 size = get_atomic_type_size(akind);
8476 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8477 size = get_atomic_type_size(get_intptr_kind());
8481 expression_t *const value = expression->unary.value;
8482 type_t *const value_type = value->base.type;
8483 type_kind_t const value_kind = value_type->kind;
8485 unsigned value_flags;
8486 unsigned value_size;
8487 if (value_kind == TYPE_ATOMIC) {
8488 atomic_type_kind_t const value_akind = value_type->atomic.akind;
8489 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8490 value_size = get_atomic_type_size(value_akind);
8491 } else if (value_kind == TYPE_POINTER) {
8492 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8493 value_size = get_atomic_type_size(get_intptr_kind());
8498 if (value_flags != flags || value_size != size)
8502 } while (expression->kind == EXPR_UNARY_CAST);
8506 if (!is_lvalue(expression)) {
8507 errorf(&expression->base.source_position,
8508 "asm output argument is not an lvalue");
8511 argument->expression = expression;
8514 set_address_taken(expression, true);
8517 last->next = argument;
8523 if (token.type != ',')
8534 * Parse a asm statement clobber specification.
8536 static asm_clobber_t *parse_asm_clobbers(void)
8538 asm_clobber_t *result = NULL;
8539 asm_clobber_t *last = NULL;
8541 while(token.type == T_STRING_LITERAL) {
8542 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
8543 clobber->clobber = parse_string_literals();
8546 last->next = clobber;
8552 if (token.type != ',')
8561 * Parse an asm statement.
8563 static statement_t *parse_asm_statement(void)
8567 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8568 statement->base.source_position = token.source_position;
8570 asm_statement_t *asm_statement = &statement->asms;
8572 if (token.type == T_volatile) {
8574 asm_statement->is_volatile = true;
8578 add_anchor_token(')');
8579 add_anchor_token(':');
8580 asm_statement->asm_text = parse_string_literals();
8582 if (token.type != ':') {
8583 rem_anchor_token(':');
8588 asm_statement->outputs = parse_asm_arguments(true);
8589 if (token.type != ':') {
8590 rem_anchor_token(':');
8595 asm_statement->inputs = parse_asm_arguments(false);
8596 if (token.type != ':') {
8597 rem_anchor_token(':');
8600 rem_anchor_token(':');
8603 asm_statement->clobbers = parse_asm_clobbers();
8606 rem_anchor_token(')');
8610 if (asm_statement->outputs == NULL) {
8611 /* GCC: An 'asm' instruction without any output operands will be treated
8612 * identically to a volatile 'asm' instruction. */
8613 asm_statement->is_volatile = true;
8618 return create_invalid_statement();
8622 * Parse a case statement.
8624 static statement_t *parse_case_statement(void)
8628 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8629 source_position_t *const pos = &statement->base.source_position;
8631 *pos = token.source_position;
8632 expression_t *const expression = parse_expression();
8633 statement->case_label.expression = expression;
8634 if (!is_constant_expression(expression)) {
8635 /* This check does not prevent the error message in all cases of an
8636 * prior error while parsing the expression. At least it catches the
8637 * common case of a mistyped enum entry. */
8638 if (is_type_valid(expression->base.type)) {
8639 errorf(pos, "case label does not reduce to an integer constant");
8641 statement->case_label.is_bad = true;
8643 long const val = fold_constant(expression);
8644 statement->case_label.first_case = val;
8645 statement->case_label.last_case = val;
8648 if (c_mode & _GNUC) {
8649 if (token.type == T_DOTDOTDOT) {
8651 expression_t *const end_range = parse_expression();
8652 statement->case_label.end_range = end_range;
8653 if (!is_constant_expression(end_range)) {
8654 /* This check does not prevent the error message in all cases of an
8655 * prior error while parsing the expression. At least it catches the
8656 * common case of a mistyped enum entry. */
8657 if (is_type_valid(end_range->base.type)) {
8658 errorf(pos, "case range does not reduce to an integer constant");
8660 statement->case_label.is_bad = true;
8662 long const val = fold_constant(end_range);
8663 statement->case_label.last_case = val;
8665 if (val < statement->case_label.first_case) {
8666 statement->case_label.is_empty = true;
8667 warningf(pos, "empty range specified");
8673 PUSH_PARENT(statement);
8677 if (current_switch != NULL) {
8678 if (! statement->case_label.is_bad) {
8679 /* Check for duplicate case values */
8680 case_label_statement_t *c = &statement->case_label;
8681 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
8682 if (l->is_bad || l->is_empty || l->expression == NULL)
8685 if (c->last_case < l->first_case || c->first_case > l->last_case)
8688 errorf(pos, "duplicate case value (previously used %P)",
8689 &l->base.source_position);
8693 /* link all cases into the switch statement */
8694 if (current_switch->last_case == NULL) {
8695 current_switch->first_case = &statement->case_label;
8697 current_switch->last_case->next = &statement->case_label;
8699 current_switch->last_case = &statement->case_label;
8701 errorf(pos, "case label not within a switch statement");
8704 statement_t *const inner_stmt = parse_statement();
8705 statement->case_label.statement = inner_stmt;
8706 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8707 errorf(&inner_stmt->base.source_position, "declaration after case label");
8714 return create_invalid_statement();
8718 * Parse a default statement.
8720 static statement_t *parse_default_statement(void)
8724 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8725 statement->base.source_position = token.source_position;
8727 PUSH_PARENT(statement);
8730 if (current_switch != NULL) {
8731 const case_label_statement_t *def_label = current_switch->default_label;
8732 if (def_label != NULL) {
8733 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
8734 &def_label->base.source_position);
8736 current_switch->default_label = &statement->case_label;
8738 /* link all cases into the switch statement */
8739 if (current_switch->last_case == NULL) {
8740 current_switch->first_case = &statement->case_label;
8742 current_switch->last_case->next = &statement->case_label;
8744 current_switch->last_case = &statement->case_label;
8747 errorf(&statement->base.source_position,
8748 "'default' label not within a switch statement");
8751 statement_t *const inner_stmt = parse_statement();
8752 statement->case_label.statement = inner_stmt;
8753 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8754 errorf(&inner_stmt->base.source_position, "declaration after default label");
8761 return create_invalid_statement();
8765 * Parse a label statement.
8767 static statement_t *parse_label_statement(void)
8769 assert(token.type == T_IDENTIFIER);
8770 symbol_t *symbol = token.v.symbol;
8773 declaration_t *label = get_label(symbol);
8775 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
8776 statement->base.source_position = token.source_position;
8777 statement->label.label = label;
8779 PUSH_PARENT(statement);
8781 /* if statement is already set then the label is defined twice,
8782 * otherwise it was just mentioned in a goto/local label declaration so far */
8783 if (label->init.statement != NULL) {
8784 errorf(HERE, "duplicate label '%Y' (declared %P)",
8785 symbol, &label->source_position);
8787 label->source_position = token.source_position;
8788 label->init.statement = statement;
8793 if (token.type == '}') {
8794 /* TODO only warn? */
8796 warningf(HERE, "label at end of compound statement");
8797 statement->label.statement = create_empty_statement();
8799 errorf(HERE, "label at end of compound statement");
8800 statement->label.statement = create_invalid_statement();
8802 } else if (token.type == ';') {
8803 /* Eat an empty statement here, to avoid the warning about an empty
8804 * statement after a label. label:; is commonly used to have a label
8805 * before a closing brace. */
8806 statement->label.statement = create_empty_statement();
8809 statement_t *const inner_stmt = parse_statement();
8810 statement->label.statement = inner_stmt;
8811 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8812 errorf(&inner_stmt->base.source_position, "declaration after label");
8816 /* remember the labels in a list for later checking */
8817 if (label_last == NULL) {
8818 label_first = &statement->label;
8820 label_last->next = &statement->label;
8822 label_last = &statement->label;
8829 * Parse an if statement.
8831 static statement_t *parse_if(void)
8835 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
8836 statement->base.source_position = token.source_position;
8838 PUSH_PARENT(statement);
8841 add_anchor_token(')');
8842 statement->ifs.condition = parse_expression();
8843 rem_anchor_token(')');
8846 add_anchor_token(T_else);
8847 statement->ifs.true_statement = parse_statement();
8848 rem_anchor_token(T_else);
8850 if (token.type == T_else) {
8852 statement->ifs.false_statement = parse_statement();
8859 return create_invalid_statement();
8863 * Check that all enums are handled in a switch.
8865 * @param statement the switch statement to check
8867 static void check_enum_cases(const switch_statement_t *statement) {
8868 const type_t *type = skip_typeref(statement->expression->base.type);
8869 if (! is_type_enum(type))
8871 const enum_type_t *enumt = &type->enumt;
8873 /* if we have a default, no warnings */
8874 if (statement->default_label != NULL)
8877 /* FIXME: calculation of value should be done while parsing */
8878 const declaration_t *declaration;
8879 long last_value = -1;
8880 for (declaration = enumt->declaration->next;
8881 declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY;
8882 declaration = declaration->next) {
8883 const expression_t *expression = declaration->init.enum_value;
8884 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
8886 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
8887 if (l->expression == NULL)
8889 if (l->first_case <= value && value <= l->last_case) {
8895 warningf(&statement->base.source_position,
8896 "enumeration value '%Y' not handled in switch", declaration->symbol);
8903 * Parse a switch statement.
8905 static statement_t *parse_switch(void)
8909 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
8910 statement->base.source_position = token.source_position;
8912 PUSH_PARENT(statement);
8915 add_anchor_token(')');
8916 expression_t *const expr = parse_expression();
8917 type_t * type = skip_typeref(expr->base.type);
8918 if (is_type_integer(type)) {
8919 type = promote_integer(type);
8920 if (warning.traditional) {
8921 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
8922 warningf(&expr->base.source_position,
8923 "'%T' switch expression not converted to '%T' in ISO C",
8927 } else if (is_type_valid(type)) {
8928 errorf(&expr->base.source_position,
8929 "switch quantity is not an integer, but '%T'", type);
8930 type = type_error_type;
8932 statement->switchs.expression = create_implicit_cast(expr, type);
8934 rem_anchor_token(')');
8936 switch_statement_t *rem = current_switch;
8937 current_switch = &statement->switchs;
8938 statement->switchs.body = parse_statement();
8939 current_switch = rem;
8941 if (warning.switch_default &&
8942 statement->switchs.default_label == NULL) {
8943 warningf(&statement->base.source_position, "switch has no default case");
8945 if (warning.switch_enum)
8946 check_enum_cases(&statement->switchs);
8952 return create_invalid_statement();
8955 static statement_t *parse_loop_body(statement_t *const loop)
8957 statement_t *const rem = current_loop;
8958 current_loop = loop;
8960 statement_t *const body = parse_statement();
8967 * Parse a while statement.
8969 static statement_t *parse_while(void)
8973 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
8974 statement->base.source_position = token.source_position;
8976 PUSH_PARENT(statement);
8979 add_anchor_token(')');
8980 statement->whiles.condition = parse_expression();
8981 rem_anchor_token(')');
8984 statement->whiles.body = parse_loop_body(statement);
8990 return create_invalid_statement();
8994 * Parse a do statement.
8996 static statement_t *parse_do(void)
9000 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9001 statement->base.source_position = token.source_position;
9003 PUSH_PARENT(statement)
9005 add_anchor_token(T_while);
9006 statement->do_while.body = parse_loop_body(statement);
9007 rem_anchor_token(T_while);
9011 add_anchor_token(')');
9012 statement->do_while.condition = parse_expression();
9013 rem_anchor_token(')');
9021 return create_invalid_statement();
9025 * Parse a for statement.
9027 static statement_t *parse_for(void)
9031 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9032 statement->base.source_position = token.source_position;
9034 PUSH_PARENT(statement);
9036 int top = environment_top();
9037 scope_t *last_scope = scope;
9038 set_scope(&statement->fors.scope);
9041 add_anchor_token(')');
9043 if (token.type != ';') {
9044 if (is_declaration_specifier(&token, false)) {
9045 parse_declaration(record_declaration);
9047 add_anchor_token(';');
9048 expression_t *const init = parse_expression();
9049 statement->fors.initialisation = init;
9050 if (warning.unused_value && !expression_has_effect(init)) {
9051 warningf(&init->base.source_position,
9052 "initialisation of 'for'-statement has no effect");
9054 rem_anchor_token(';');
9061 if (token.type != ';') {
9062 add_anchor_token(';');
9063 statement->fors.condition = parse_expression();
9064 rem_anchor_token(';');
9067 if (token.type != ')') {
9068 expression_t *const step = parse_expression();
9069 statement->fors.step = step;
9070 if (warning.unused_value && !expression_has_effect(step)) {
9071 warningf(&step->base.source_position,
9072 "step of 'for'-statement has no effect");
9075 rem_anchor_token(')');
9077 statement->fors.body = parse_loop_body(statement);
9079 assert(scope == &statement->fors.scope);
9080 set_scope(last_scope);
9081 environment_pop_to(top);
9088 rem_anchor_token(')');
9089 assert(scope == &statement->fors.scope);
9090 set_scope(last_scope);
9091 environment_pop_to(top);
9093 return create_invalid_statement();
9097 * Parse a goto statement.
9099 static statement_t *parse_goto(void)
9101 source_position_t source_position = token.source_position;
9104 statement_t *statement;
9105 if (c_mode & _GNUC && token.type == '*') {
9107 expression_t *expression = parse_expression();
9109 /* Argh: although documentation say the expression must be of type void *,
9110 * gcc excepts anything that can be casted into void * without error */
9111 type_t *type = expression->base.type;
9113 if (type != type_error_type) {
9114 if (!is_type_pointer(type) && !is_type_integer(type)) {
9115 errorf(&source_position, "cannot convert to a pointer type");
9116 } else if (type != type_void_ptr) {
9117 warningf(&source_position,
9118 "type of computed goto expression should be 'void*' not '%T'", type);
9120 expression = create_implicit_cast(expression, type_void_ptr);
9123 statement = allocate_statement_zero(STATEMENT_GOTO);
9124 statement->base.source_position = source_position;
9125 statement->gotos.expression = expression;
9127 if (token.type != T_IDENTIFIER) {
9129 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9131 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9135 symbol_t *symbol = token.v.symbol;
9138 statement = allocate_statement_zero(STATEMENT_GOTO);
9139 statement->base.source_position = source_position;
9140 statement->gotos.label = get_label(symbol);
9143 /* remember the goto's in a list for later checking */
9144 if (goto_last == NULL) {
9145 goto_first = &statement->gotos;
9147 goto_last->next = &statement->gotos;
9149 goto_last = &statement->gotos;
9155 return create_invalid_statement();
9159 * Parse a continue statement.
9161 static statement_t *parse_continue(void)
9163 if (current_loop == NULL) {
9164 errorf(HERE, "continue statement not within loop");
9167 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9168 statement->base.source_position = token.source_position;
9178 * Parse a break statement.
9180 static statement_t *parse_break(void)
9182 if (current_switch == NULL && current_loop == NULL) {
9183 errorf(HERE, "break statement not within loop or switch");
9186 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9187 statement->base.source_position = token.source_position;
9197 * Parse a __leave statement.
9199 static statement_t *parse_leave_statement(void)
9201 if (current_try == NULL) {
9202 errorf(HERE, "__leave statement not within __try");
9205 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9206 statement->base.source_position = token.source_position;
9216 * Check if a given declaration represents a local variable.
9218 static bool is_local_var_declaration(const declaration_t *declaration)
9220 switch ((storage_class_tag_t) declaration->storage_class) {
9221 case STORAGE_CLASS_AUTO:
9222 case STORAGE_CLASS_REGISTER: {
9223 const type_t *type = skip_typeref(declaration->type);
9224 if (is_type_function(type)) {
9236 * Check if a given declaration represents a variable.
9238 static bool is_var_declaration(const declaration_t *declaration)
9240 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
9243 const type_t *type = skip_typeref(declaration->type);
9244 return !is_type_function(type);
9248 * Check if a given expression represents a local variable.
9250 static bool is_local_variable(const expression_t *expression)
9252 if (expression->base.kind != EXPR_REFERENCE) {
9255 const declaration_t *declaration = expression->reference.declaration;
9256 return is_local_var_declaration(declaration);
9260 * Check if a given expression represents a local variable and
9261 * return its declaration then, else return NULL.
9263 declaration_t *expr_is_variable(const expression_t *expression)
9265 if (expression->base.kind != EXPR_REFERENCE) {
9268 declaration_t *declaration = expression->reference.declaration;
9269 if (is_var_declaration(declaration))
9275 * Parse a return statement.
9277 static statement_t *parse_return(void)
9279 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9280 statement->base.source_position = token.source_position;
9284 expression_t *return_value = NULL;
9285 if (token.type != ';') {
9286 return_value = parse_expression();
9289 const type_t *const func_type = current_function->type;
9290 assert(is_type_function(func_type));
9291 type_t *const return_type = skip_typeref(func_type->function.return_type);
9293 if (return_value != NULL) {
9294 type_t *return_value_type = skip_typeref(return_value->base.type);
9296 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
9297 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9298 warningf(&statement->base.source_position,
9299 "'return' with a value, in function returning void");
9300 return_value = NULL;
9302 assign_error_t error = semantic_assign(return_type, return_value);
9303 report_assign_error(error, return_type, return_value, "'return'",
9304 &statement->base.source_position);
9305 return_value = create_implicit_cast(return_value, return_type);
9307 /* check for returning address of a local var */
9308 if (return_value != NULL &&
9309 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9310 const expression_t *expression = return_value->unary.value;
9311 if (is_local_variable(expression)) {
9312 warningf(&statement->base.source_position,
9313 "function returns address of local variable");
9317 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9318 warningf(&statement->base.source_position,
9319 "'return' without value, in function returning non-void");
9322 statement->returns.value = return_value;
9331 * Parse a declaration statement.
9333 static statement_t *parse_declaration_statement(void)
9335 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9337 statement->base.source_position = token.source_position;
9339 declaration_t *before = last_declaration;
9340 parse_declaration(record_declaration);
9342 if (before == NULL) {
9343 statement->declaration.declarations_begin = scope->declarations;
9345 statement->declaration.declarations_begin = before->next;
9347 statement->declaration.declarations_end = last_declaration;
9353 * Parse an expression statement, ie. expr ';'.
9355 static statement_t *parse_expression_statement(void)
9357 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9359 statement->base.source_position = token.source_position;
9360 expression_t *const expr = parse_expression();
9361 statement->expression.expression = expr;
9370 * Parse a microsoft __try { } __finally { } or
9371 * __try{ } __except() { }
9373 static statement_t *parse_ms_try_statment(void)
9375 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9376 statement->base.source_position = token.source_position;
9379 PUSH_PARENT(statement);
9381 ms_try_statement_t *rem = current_try;
9382 current_try = &statement->ms_try;
9383 statement->ms_try.try_statement = parse_compound_statement(false);
9388 if (token.type == T___except) {
9391 add_anchor_token(')');
9392 expression_t *const expr = parse_expression();
9393 type_t * type = skip_typeref(expr->base.type);
9394 if (is_type_integer(type)) {
9395 type = promote_integer(type);
9396 } else if (is_type_valid(type)) {
9397 errorf(&expr->base.source_position,
9398 "__expect expression is not an integer, but '%T'", type);
9399 type = type_error_type;
9401 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9402 rem_anchor_token(')');
9404 statement->ms_try.final_statement = parse_compound_statement(false);
9405 } else if (token.type == T__finally) {
9407 statement->ms_try.final_statement = parse_compound_statement(false);
9409 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9410 return create_invalid_statement();
9414 return create_invalid_statement();
9417 static statement_t *parse_empty_statement(void)
9419 if (warning.empty_statement) {
9420 warningf(HERE, "statement is empty");
9422 statement_t *const statement = create_empty_statement();
9427 static statement_t *parse_local_label_declaration(void) {
9428 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9429 statement->base.source_position = token.source_position;
9433 declaration_t *begin = NULL, *end = NULL;
9436 if (token.type != T_IDENTIFIER) {
9437 parse_error_expected("while parsing local label declaration",
9438 T_IDENTIFIER, NULL);
9441 symbol_t *symbol = token.v.symbol;
9442 declaration_t *declaration = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
9443 if (declaration != NULL) {
9444 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition at %P)",
9445 symbol, &declaration->source_position);
9447 declaration = allocate_declaration_zero();
9448 declaration->namespc = NAMESPACE_LOCAL_LABEL;
9449 declaration->source_position = token.source_position;
9450 declaration->symbol = symbol;
9451 declaration->parent_scope = scope;
9452 declaration->init.statement = NULL;
9455 end->next = declaration;
9458 begin = declaration;
9460 local_label_push(declaration);
9464 if (token.type != ',')
9470 statement->declaration.declarations_begin = begin;
9471 statement->declaration.declarations_end = end;
9476 * Parse a statement.
9477 * There's also parse_statement() which additionally checks for
9478 * "statement has no effect" warnings
9480 static statement_t *intern_parse_statement(void)
9482 statement_t *statement = NULL;
9484 /* declaration or statement */
9485 add_anchor_token(';');
9486 switch (token.type) {
9487 case T_IDENTIFIER: {
9488 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9489 if (la1_type == ':') {
9490 statement = parse_label_statement();
9491 } else if (is_typedef_symbol(token.v.symbol)) {
9492 statement = parse_declaration_statement();
9493 } else switch (la1_type) {
9495 if (get_declaration(token.v.symbol, NAMESPACE_NORMAL) != NULL)
9496 goto expression_statment;
9501 statement = parse_declaration_statement();
9505 expression_statment:
9506 statement = parse_expression_statement();
9512 case T___extension__:
9513 /* This can be a prefix to a declaration or an expression statement.
9514 * We simply eat it now and parse the rest with tail recursion. */
9517 } while (token.type == T___extension__);
9518 statement = parse_statement();
9522 statement = parse_declaration_statement();
9526 statement = parse_local_label_declaration();
9529 case ';': statement = parse_empty_statement(); break;
9530 case '{': statement = parse_compound_statement(false); break;
9531 case T___leave: statement = parse_leave_statement(); break;
9532 case T___try: statement = parse_ms_try_statment(); break;
9533 case T_asm: statement = parse_asm_statement(); break;
9534 case T_break: statement = parse_break(); break;
9535 case T_case: statement = parse_case_statement(); break;
9536 case T_continue: statement = parse_continue(); break;
9537 case T_default: statement = parse_default_statement(); break;
9538 case T_do: statement = parse_do(); break;
9539 case T_for: statement = parse_for(); break;
9540 case T_goto: statement = parse_goto(); break;
9541 case T_if: statement = parse_if (); break;
9542 case T_return: statement = parse_return(); break;
9543 case T_switch: statement = parse_switch(); break;
9544 case T_while: statement = parse_while(); break;
9545 default: statement = parse_expression_statement(); break;
9547 rem_anchor_token(';');
9549 assert(statement != NULL
9550 && statement->base.source_position.input_name != NULL);
9556 * parse a statement and emits "statement has no effect" warning if needed
9557 * (This is really a wrapper around intern_parse_statement with check for 1
9558 * single warning. It is needed, because for statement expressions we have
9559 * to avoid the warning on the last statement)
9561 static statement_t *parse_statement(void)
9563 statement_t *statement = intern_parse_statement();
9565 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
9566 expression_t *expression = statement->expression.expression;
9567 if (!expression_has_effect(expression)) {
9568 warningf(&expression->base.source_position,
9569 "statement has no effect");
9577 * Parse a compound statement.
9579 static statement_t *parse_compound_statement(bool inside_expression_statement)
9581 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
9582 statement->base.source_position = token.source_position;
9584 PUSH_PARENT(statement);
9587 add_anchor_token('}');
9589 int top = environment_top();
9590 int top_local = local_label_top();
9591 scope_t *last_scope = scope;
9592 set_scope(&statement->compound.scope);
9594 statement_t **anchor = &statement->compound.statements;
9595 bool only_decls_so_far = true;
9596 while (token.type != '}' && token.type != T_EOF) {
9597 statement_t *sub_statement = intern_parse_statement();
9598 if (is_invalid_statement(sub_statement)) {
9599 /* an error occurred. if we are at an anchor, return */
9605 if (warning.declaration_after_statement) {
9606 if (sub_statement->kind != STATEMENT_DECLARATION) {
9607 only_decls_so_far = false;
9608 } else if (!only_decls_so_far) {
9609 warningf(&sub_statement->base.source_position,
9610 "ISO C90 forbids mixed declarations and code");
9614 *anchor = sub_statement;
9616 while (sub_statement->base.next != NULL)
9617 sub_statement = sub_statement->base.next;
9619 anchor = &sub_statement->base.next;
9622 if (token.type == '}') {
9625 errorf(&statement->base.source_position,
9626 "end of file while looking for closing '}'");
9629 /* look over all statements again to produce no effect warnings */
9630 if (warning.unused_value) {
9631 statement_t *sub_statement = statement->compound.statements;
9632 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
9633 if (sub_statement->kind != STATEMENT_EXPRESSION)
9635 /* don't emit a warning for the last expression in an expression
9636 * statement as it has always an effect */
9637 if (inside_expression_statement && sub_statement->base.next == NULL)
9640 expression_t *expression = sub_statement->expression.expression;
9641 if (!expression_has_effect(expression)) {
9642 warningf(&expression->base.source_position,
9643 "statement has no effect");
9649 rem_anchor_token('}');
9650 assert(scope == &statement->compound.scope);
9651 set_scope(last_scope);
9652 environment_pop_to(top);
9653 local_label_pop_to(top_local);
9660 * Initialize builtin types.
9662 static void initialize_builtin_types(void)
9664 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
9665 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
9666 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
9667 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
9668 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
9669 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
9670 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", opt_short_wchar_t ? type_unsigned_short : type_int);
9671 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
9673 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
9674 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
9675 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
9676 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
9678 /* const version of wchar_t */
9679 type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
9680 type_const_wchar_t->typedeft.declaration = type_wchar_t->typedeft.declaration;
9681 type_const_wchar_t->base.qualifiers |= TYPE_QUALIFIER_CONST;
9683 type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE);
9687 * Check for unused global static functions and variables
9689 static void check_unused_globals(void)
9691 if (!warning.unused_function && !warning.unused_variable)
9694 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
9696 decl->modifiers & DM_UNUSED ||
9697 decl->modifiers & DM_USED ||
9698 decl->storage_class != STORAGE_CLASS_STATIC)
9701 type_t *const type = decl->type;
9703 if (is_type_function(skip_typeref(type))) {
9704 if (!warning.unused_function || decl->is_inline)
9707 s = (decl->init.statement != NULL ? "defined" : "declared");
9709 if (!warning.unused_variable)
9715 warningf(&decl->source_position, "'%#T' %s but not used",
9716 type, decl->symbol, s);
9720 static void parse_global_asm(void)
9725 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9726 statement->base.source_position = token.source_position;
9727 statement->asms.asm_text = parse_string_literals();
9728 statement->base.next = unit->global_asm;
9729 unit->global_asm = statement;
9738 * Parse a translation unit.
9740 static void parse_translation_unit(void)
9742 for (;;) switch (token.type) {
9745 case T___extension__:
9746 parse_external_declaration();
9757 /* TODO error in strict mode */
9758 warningf(HERE, "stray ';' outside of function");
9763 errorf(HERE, "stray %K outside of function", &token);
9764 if (token.type == '(' || token.type == '{' || token.type == '[')
9765 eat_until_matching_token(token.type);
9774 * @return the translation unit or NULL if errors occurred.
9776 void start_parsing(void)
9778 environment_stack = NEW_ARR_F(stack_entry_t, 0);
9779 label_stack = NEW_ARR_F(stack_entry_t, 0);
9780 local_label_stack = NEW_ARR_F(stack_entry_t, 0);
9781 diagnostic_count = 0;
9785 type_set_output(stderr);
9786 ast_set_output(stderr);
9788 assert(unit == NULL);
9789 unit = allocate_ast_zero(sizeof(unit[0]));
9791 assert(global_scope == NULL);
9792 global_scope = &unit->scope;
9794 assert(scope == NULL);
9795 set_scope(&unit->scope);
9797 initialize_builtin_types();
9800 translation_unit_t *finish_parsing(void)
9802 assert(scope == &unit->scope);
9804 last_declaration = NULL;
9806 assert(global_scope == &unit->scope);
9807 check_unused_globals();
9808 global_scope = NULL;
9810 DEL_ARR_F(environment_stack);
9811 DEL_ARR_F(label_stack);
9812 DEL_ARR_F(local_label_stack);
9814 translation_unit_t *result = unit;
9821 lookahead_bufpos = 0;
9822 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
9825 parse_translation_unit();
9829 * Initialize the parser.
9831 void init_parser(void)
9834 /* add predefined symbols for extended-decl-modifier */
9835 sym_align = symbol_table_insert("align");
9836 sym_allocate = symbol_table_insert("allocate");
9837 sym_dllimport = symbol_table_insert("dllimport");
9838 sym_dllexport = symbol_table_insert("dllexport");
9839 sym_naked = symbol_table_insert("naked");
9840 sym_noinline = symbol_table_insert("noinline");
9841 sym_noreturn = symbol_table_insert("noreturn");
9842 sym_nothrow = symbol_table_insert("nothrow");
9843 sym_novtable = symbol_table_insert("novtable");
9844 sym_property = symbol_table_insert("property");
9845 sym_get = symbol_table_insert("get");
9846 sym_put = symbol_table_insert("put");
9847 sym_selectany = symbol_table_insert("selectany");
9848 sym_thread = symbol_table_insert("thread");
9849 sym_uuid = symbol_table_insert("uuid");
9850 sym_deprecated = symbol_table_insert("deprecated");
9851 sym_restrict = symbol_table_insert("restrict");
9852 sym_noalias = symbol_table_insert("noalias");
9854 memset(token_anchor_set, 0, sizeof(token_anchor_set));
9856 init_expression_parsers();
9857 obstack_init(&temp_obst);
9859 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
9860 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
9864 * Terminate the parser.
9866 void exit_parser(void)
9868 obstack_free(&temp_obst, NULL);