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 il_alignment_t m_alignment = m_type->base.alignment;
3145 new_size = (size + m_alignment - 1) & -m_alignment;
3146 if (m_alignment > alignment)
3147 alignment = m_alignment;
3148 if (new_size > size)
3150 entry->offset = new_size;
3151 size = new_size + m_type->base.size;
3153 if (type->base.alignment != 0) {
3154 alignment = type->base.alignment;
3157 new_size = (size + alignment - 1) & -alignment;
3158 if (new_size > size)
3161 if (warning.padded && need_pad) {
3162 warningf(&struct_decl->source_position,
3163 "'%#T' needs padding", type, struct_decl->symbol);
3165 if (warning.packed && !need_pad) {
3166 warningf(&struct_decl->source_position,
3167 "superfluous packed attribute on '%#T'",
3168 type, struct_decl->symbol);
3171 type->base.size = new_size;
3172 type->base.alignment = alignment;
3176 * Finish the construction of an union type by calculating
3177 * its size and alignment.
3179 static void finish_union_type(compound_type_t *type) {
3180 if (type->declaration == NULL)
3182 declaration_t *union_decl = type->declaration;
3183 if (! union_decl->init.complete)
3187 il_alignment_t alignment = 1;
3189 declaration_t *entry = union_decl->scope.declarations;
3190 for (; entry != NULL; entry = entry->next) {
3191 if (entry->namespc != NAMESPACE_NORMAL)
3194 type_t *m_type = skip_typeref(entry->type);
3197 if (m_type->base.size > size)
3198 size = m_type->base.size;
3199 if (m_type->base.alignment > alignment)
3200 alignment = m_type->base.alignment;
3202 if (type->base.alignment != 0) {
3203 alignment = type->base.alignment;
3205 size = (size + alignment - 1) & -alignment;
3206 type->base.size = size;
3207 type->base.alignment = alignment;
3210 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3212 type_t *type = NULL;
3213 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3214 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3215 unsigned type_specifiers = 0;
3216 bool newtype = false;
3217 bool saw_error = false;
3219 specifiers->source_position = token.source_position;
3222 specifiers->modifiers
3223 |= parse_attributes(&specifiers->gnu_attributes);
3224 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3225 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3227 switch(token.type) {
3230 #define MATCH_STORAGE_CLASS(token, class) \
3232 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3233 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3235 specifiers->declared_storage_class = class; \
3239 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3240 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3241 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3242 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3243 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3248 add_anchor_token(')');
3249 parse_microsoft_extended_decl_modifier(specifiers);
3250 rem_anchor_token(')');
3255 switch (specifiers->declared_storage_class) {
3256 case STORAGE_CLASS_NONE:
3257 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3260 case STORAGE_CLASS_EXTERN:
3261 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3264 case STORAGE_CLASS_STATIC:
3265 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3269 errorf(HERE, "multiple storage classes in declaration specifiers");
3275 /* type qualifiers */
3276 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3278 qualifiers |= qualifier; \
3282 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3283 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3284 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3285 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3286 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3287 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3288 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3289 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3291 case T___extension__:
3296 /* type specifiers */
3297 #define MATCH_SPECIFIER(token, specifier, name) \
3300 if (type_specifiers & specifier) { \
3301 errorf(HERE, "multiple " name " type specifiers given"); \
3303 type_specifiers |= specifier; \
3307 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3308 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3309 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3310 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3311 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3312 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3313 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3314 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3315 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3316 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3317 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3318 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3319 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3320 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3321 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3322 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3324 case T__forceinline:
3325 /* only in microsoft mode */
3326 specifiers->modifiers |= DM_FORCEINLINE;
3331 specifiers->is_inline = true;
3336 if (type_specifiers & SPECIFIER_LONG_LONG) {
3337 errorf(HERE, "multiple type specifiers given");
3338 } else if (type_specifiers & SPECIFIER_LONG) {
3339 type_specifiers |= SPECIFIER_LONG_LONG;
3341 type_specifiers |= SPECIFIER_LONG;
3346 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3348 type->compound.declaration = parse_compound_type_specifier(true);
3349 finish_struct_type(&type->compound);
3353 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3354 type->compound.declaration = parse_compound_type_specifier(false);
3355 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3356 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3358 finish_union_type(&type->compound);
3361 type = parse_enum_specifier();
3364 type = parse_typeof();
3366 case T___builtin_va_list:
3367 type = duplicate_type(type_valist);
3371 case T_IDENTIFIER: {
3372 /* only parse identifier if we haven't found a type yet */
3373 if (type != NULL || type_specifiers != 0) {
3374 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3375 * declaration, so it doesn't generate errors about expecting '(' or
3377 switch (look_ahead(1)->type) {
3384 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3387 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3392 goto finish_specifiers;
3396 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3397 if (typedef_type == NULL) {
3398 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3399 * declaration, so it doesn't generate 'implicit int' followed by more
3400 * errors later on. */
3401 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3406 errorf(HERE, "%K does not name a type", &token);
3408 declaration_t *const decl =
3409 create_error_declaration(token.v.symbol, STORAGE_CLASS_TYPEDEF);
3411 type = allocate_type_zero(TYPE_TYPEDEF, HERE);
3412 type->typedeft.declaration = decl;
3416 if (la1_type == '*')
3417 goto finish_specifiers;
3422 goto finish_specifiers;
3427 type = typedef_type;
3431 /* function specifier */
3433 goto finish_specifiers;
3438 if (type == NULL || (saw_error && type_specifiers != 0)) {
3439 atomic_type_kind_t atomic_type;
3441 /* match valid basic types */
3442 switch(type_specifiers) {
3443 case SPECIFIER_VOID:
3444 atomic_type = ATOMIC_TYPE_VOID;
3446 case SPECIFIER_CHAR:
3447 atomic_type = ATOMIC_TYPE_CHAR;
3449 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3450 atomic_type = ATOMIC_TYPE_SCHAR;
3452 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3453 atomic_type = ATOMIC_TYPE_UCHAR;
3455 case SPECIFIER_SHORT:
3456 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3457 case SPECIFIER_SHORT | SPECIFIER_INT:
3458 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3459 atomic_type = ATOMIC_TYPE_SHORT;
3461 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3462 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3463 atomic_type = ATOMIC_TYPE_USHORT;
3466 case SPECIFIER_SIGNED:
3467 case SPECIFIER_SIGNED | SPECIFIER_INT:
3468 atomic_type = ATOMIC_TYPE_INT;
3470 case SPECIFIER_UNSIGNED:
3471 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3472 atomic_type = ATOMIC_TYPE_UINT;
3474 case SPECIFIER_LONG:
3475 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3476 case SPECIFIER_LONG | SPECIFIER_INT:
3477 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3478 atomic_type = ATOMIC_TYPE_LONG;
3480 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3481 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3482 atomic_type = ATOMIC_TYPE_ULONG;
3485 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3486 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3487 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3488 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3490 atomic_type = ATOMIC_TYPE_LONGLONG;
3491 goto warn_about_long_long;
3493 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3494 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3496 atomic_type = ATOMIC_TYPE_ULONGLONG;
3497 warn_about_long_long:
3498 if (warning.long_long) {
3499 warningf(&specifiers->source_position,
3500 "ISO C90 does not support 'long long'");
3504 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3505 atomic_type = unsigned_int8_type_kind;
3508 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3509 atomic_type = unsigned_int16_type_kind;
3512 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3513 atomic_type = unsigned_int32_type_kind;
3516 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3517 atomic_type = unsigned_int64_type_kind;
3520 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3521 atomic_type = unsigned_int128_type_kind;
3524 case SPECIFIER_INT8:
3525 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3526 atomic_type = int8_type_kind;
3529 case SPECIFIER_INT16:
3530 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3531 atomic_type = int16_type_kind;
3534 case SPECIFIER_INT32:
3535 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3536 atomic_type = int32_type_kind;
3539 case SPECIFIER_INT64:
3540 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3541 atomic_type = int64_type_kind;
3544 case SPECIFIER_INT128:
3545 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3546 atomic_type = int128_type_kind;
3549 case SPECIFIER_FLOAT:
3550 atomic_type = ATOMIC_TYPE_FLOAT;
3552 case SPECIFIER_DOUBLE:
3553 atomic_type = ATOMIC_TYPE_DOUBLE;
3555 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3556 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3558 case SPECIFIER_BOOL:
3559 atomic_type = ATOMIC_TYPE_BOOL;
3561 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3562 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3563 atomic_type = ATOMIC_TYPE_FLOAT;
3565 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3566 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3567 atomic_type = ATOMIC_TYPE_DOUBLE;
3569 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3570 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3571 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3574 /* invalid specifier combination, give an error message */
3575 if (type_specifiers == 0) {
3577 specifiers->type = type_error_type;
3582 if (warning.implicit_int) {
3583 warningf(HERE, "no type specifiers in declaration, using 'int'");
3585 atomic_type = ATOMIC_TYPE_INT;
3588 errorf(HERE, "no type specifiers given in declaration");
3590 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3591 (type_specifiers & SPECIFIER_UNSIGNED)) {
3592 errorf(HERE, "signed and unsigned specifiers given");
3593 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3594 errorf(HERE, "only integer types can be signed or unsigned");
3596 errorf(HERE, "multiple datatypes in declaration");
3598 atomic_type = ATOMIC_TYPE_INVALID;
3601 if (type_specifiers & SPECIFIER_COMPLEX &&
3602 atomic_type != ATOMIC_TYPE_INVALID) {
3603 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3604 type->complex.akind = atomic_type;
3605 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3606 atomic_type != ATOMIC_TYPE_INVALID) {
3607 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3608 type->imaginary.akind = atomic_type;
3610 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3611 type->atomic.akind = atomic_type;
3614 } else if (type_specifiers != 0) {
3615 errorf(HERE, "multiple datatypes in declaration");
3618 /* FIXME: check type qualifiers here */
3620 type->base.qualifiers = qualifiers;
3621 type->base.modifiers = modifiers;
3623 type_t *result = typehash_insert(type);
3624 if (newtype && result != type) {
3628 specifiers->type = result;
3633 static type_qualifiers_t parse_type_qualifiers(void)
3635 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3638 switch(token.type) {
3639 /* type qualifiers */
3640 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3641 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3642 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3643 /* microsoft extended type modifiers */
3644 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3645 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3646 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3647 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3648 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3656 static declaration_t *parse_identifier_list(void)
3658 declaration_t *declarations = NULL;
3659 declaration_t *last_declaration = NULL;
3661 declaration_t *const declaration = allocate_declaration_zero();
3662 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3663 declaration->source_position = token.source_position;
3664 declaration->symbol = token.v.symbol;
3667 if (last_declaration != NULL) {
3668 last_declaration->next = declaration;
3670 declarations = declaration;
3672 last_declaration = declaration;
3674 if (token.type != ',') {
3678 } while (token.type == T_IDENTIFIER);
3680 return declarations;
3683 static type_t *automatic_type_conversion(type_t *orig_type);
3685 static void semantic_parameter(declaration_t *declaration)
3687 /* TODO: improve error messages */
3688 source_position_t const* const pos = &declaration->source_position;
3690 switch (declaration->declared_storage_class) {
3691 case STORAGE_CLASS_TYPEDEF:
3692 errorf(pos, "typedef not allowed in parameter list");
3695 /* Allowed storage classes */
3696 case STORAGE_CLASS_NONE:
3697 case STORAGE_CLASS_REGISTER:
3701 errorf(pos, "parameter may only have none or register storage class");
3705 type_t *const orig_type = declaration->type;
3706 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3707 * sugar. Turn it into a pointer.
3708 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3709 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3711 type_t *const type = automatic_type_conversion(orig_type);
3712 declaration->type = type;
3714 if (is_type_incomplete(skip_typeref(type))) {
3715 errorf(pos, "parameter '%#T' is of incomplete type",
3716 orig_type, declaration->symbol);
3720 static declaration_t *parse_parameter(void)
3722 declaration_specifiers_t specifiers;
3723 memset(&specifiers, 0, sizeof(specifiers));
3725 parse_declaration_specifiers(&specifiers);
3727 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3732 static declaration_t *parse_parameters(function_type_t *type)
3734 declaration_t *declarations = NULL;
3737 add_anchor_token(')');
3738 int saved_comma_state = save_and_reset_anchor_state(',');
3740 if (token.type == T_IDENTIFIER &&
3741 !is_typedef_symbol(token.v.symbol)) {
3742 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3743 if (la1_type == ',' || la1_type == ')') {
3744 type->kr_style_parameters = true;
3745 declarations = parse_identifier_list();
3746 goto parameters_finished;
3750 if (token.type == ')') {
3751 type->unspecified_parameters = 1;
3752 goto parameters_finished;
3755 declaration_t *declaration;
3756 declaration_t *last_declaration = NULL;
3757 function_parameter_t *parameter;
3758 function_parameter_t *last_parameter = NULL;
3761 switch(token.type) {
3765 goto parameters_finished;
3768 case T___extension__:
3770 declaration = parse_parameter();
3772 /* func(void) is not a parameter */
3773 if (last_parameter == NULL
3774 && token.type == ')'
3775 && declaration->symbol == NULL
3776 && skip_typeref(declaration->type) == type_void) {
3777 goto parameters_finished;
3779 semantic_parameter(declaration);
3781 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3782 memset(parameter, 0, sizeof(parameter[0]));
3783 parameter->type = declaration->type;
3785 if (last_parameter != NULL) {
3786 last_declaration->next = declaration;
3787 last_parameter->next = parameter;
3789 type->parameters = parameter;
3790 declarations = declaration;
3792 last_parameter = parameter;
3793 last_declaration = declaration;
3797 goto parameters_finished;
3799 if (token.type != ',') {
3800 goto parameters_finished;
3806 parameters_finished:
3807 rem_anchor_token(')');
3810 restore_anchor_state(',', saved_comma_state);
3811 return declarations;
3814 restore_anchor_state(',', saved_comma_state);
3818 typedef enum construct_type_kind_t {
3823 } construct_type_kind_t;
3825 typedef struct construct_type_t construct_type_t;
3826 struct construct_type_t {
3827 construct_type_kind_t kind;
3828 construct_type_t *next;
3831 typedef struct parsed_pointer_t parsed_pointer_t;
3832 struct parsed_pointer_t {
3833 construct_type_t construct_type;
3834 type_qualifiers_t type_qualifiers;
3837 typedef struct construct_function_type_t construct_function_type_t;
3838 struct construct_function_type_t {
3839 construct_type_t construct_type;
3840 type_t *function_type;
3843 typedef struct parsed_array_t parsed_array_t;
3844 struct parsed_array_t {
3845 construct_type_t construct_type;
3846 type_qualifiers_t type_qualifiers;
3852 typedef struct construct_base_type_t construct_base_type_t;
3853 struct construct_base_type_t {
3854 construct_type_t construct_type;
3858 static construct_type_t *parse_pointer_declarator(void)
3862 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3863 memset(pointer, 0, sizeof(pointer[0]));
3864 pointer->construct_type.kind = CONSTRUCT_POINTER;
3865 pointer->type_qualifiers = parse_type_qualifiers();
3867 return (construct_type_t*) pointer;
3870 static construct_type_t *parse_array_declarator(void)
3873 add_anchor_token(']');
3875 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3876 memset(array, 0, sizeof(array[0]));
3877 array->construct_type.kind = CONSTRUCT_ARRAY;
3879 if (token.type == T_static) {
3880 array->is_static = true;
3884 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3885 if (type_qualifiers != 0) {
3886 if (token.type == T_static) {
3887 array->is_static = true;
3891 array->type_qualifiers = type_qualifiers;
3893 if (token.type == '*' && look_ahead(1)->type == ']') {
3894 array->is_variable = true;
3896 } else if (token.type != ']') {
3897 array->size = parse_assignment_expression();
3900 rem_anchor_token(']');
3903 return (construct_type_t*) array;
3908 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3911 if (declaration != NULL) {
3912 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3914 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3916 if (mask & (mask-1)) {
3917 const char *first = NULL, *second = NULL;
3919 /* more than one calling convention set */
3920 if (declaration->modifiers & DM_CDECL) {
3921 if (first == NULL) first = "cdecl";
3922 else if (second == NULL) second = "cdecl";
3924 if (declaration->modifiers & DM_STDCALL) {
3925 if (first == NULL) first = "stdcall";
3926 else if (second == NULL) second = "stdcall";
3928 if (declaration->modifiers & DM_FASTCALL) {
3929 if (first == NULL) first = "fastcall";
3930 else if (second == NULL) second = "fastcall";
3932 if (declaration->modifiers & DM_THISCALL) {
3933 if (first == NULL) first = "thiscall";
3934 else if (second == NULL) second = "thiscall";
3936 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3939 if (declaration->modifiers & DM_CDECL)
3940 type->function.calling_convention = CC_CDECL;
3941 else if (declaration->modifiers & DM_STDCALL)
3942 type->function.calling_convention = CC_STDCALL;
3943 else if (declaration->modifiers & DM_FASTCALL)
3944 type->function.calling_convention = CC_FASTCALL;
3945 else if (declaration->modifiers & DM_THISCALL)
3946 type->function.calling_convention = CC_THISCALL;
3948 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3951 declaration_t *parameters = parse_parameters(&type->function);
3952 if (declaration != NULL) {
3953 declaration->scope.declarations = parameters;
3956 construct_function_type_t *construct_function_type =
3957 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3958 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3959 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3960 construct_function_type->function_type = type;
3962 return &construct_function_type->construct_type;
3965 static void fix_declaration_type(declaration_t *declaration)
3967 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3968 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3970 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3971 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3973 if (declaration->type->base.modifiers == type_modifiers)
3976 type_t *copy = duplicate_type(declaration->type);
3977 copy->base.modifiers = type_modifiers;
3979 type_t *result = typehash_insert(copy);
3980 if (result != copy) {
3981 obstack_free(type_obst, copy);
3984 declaration->type = result;
3987 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3988 bool may_be_abstract)
3990 /* construct a single linked list of construct_type_t's which describe
3991 * how to construct the final declarator type */
3992 construct_type_t *first = NULL;
3993 construct_type_t *last = NULL;
3994 gnu_attribute_t *attributes = NULL;
3996 decl_modifiers_t modifiers = parse_attributes(&attributes);
3999 while (token.type == '*') {
4000 construct_type_t *type = parse_pointer_declarator();
4010 /* TODO: find out if this is correct */
4011 modifiers |= parse_attributes(&attributes);
4014 if (declaration != NULL)
4015 declaration->modifiers |= modifiers;
4017 construct_type_t *inner_types = NULL;
4019 switch(token.type) {
4021 if (declaration == NULL) {
4022 errorf(HERE, "no identifier expected in typename");
4024 declaration->symbol = token.v.symbol;
4025 declaration->source_position = token.source_position;
4031 add_anchor_token(')');
4032 inner_types = parse_inner_declarator(declaration, may_be_abstract);
4033 if (inner_types != NULL) {
4034 /* All later declarators only modify the return type, not declaration */
4037 rem_anchor_token(')');
4041 if (may_be_abstract)
4043 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4044 /* avoid a loop in the outermost scope, because eat_statement doesn't
4046 if (token.type == '}' && current_function == NULL) {
4054 construct_type_t *p = last;
4057 construct_type_t *type;
4058 switch(token.type) {
4060 type = parse_function_declarator(declaration);
4063 type = parse_array_declarator();
4066 goto declarator_finished;
4069 /* insert in the middle of the list (behind p) */
4071 type->next = p->next;
4082 declarator_finished:
4083 /* append inner_types at the end of the list, we don't to set last anymore
4084 * as it's not needed anymore */
4086 assert(first == NULL);
4087 first = inner_types;
4089 last->next = inner_types;
4097 static void parse_declaration_attributes(declaration_t *declaration)
4099 gnu_attribute_t *attributes = NULL;
4100 decl_modifiers_t modifiers = parse_attributes(&attributes);
4102 if (declaration == NULL)
4105 declaration->modifiers |= modifiers;
4106 /* check if we have these stupid mode attributes... */
4107 type_t *old_type = declaration->type;
4108 if (old_type == NULL)
4111 gnu_attribute_t *attribute = attributes;
4112 for ( ; attribute != NULL; attribute = attribute->next) {
4113 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4116 atomic_type_kind_t akind = attribute->u.akind;
4117 if (!is_type_signed(old_type)) {
4119 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4120 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4121 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4122 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4124 panic("invalid akind in mode attribute");
4128 = make_atomic_type(akind, old_type->base.qualifiers);
4132 static type_t *construct_declarator_type(construct_type_t *construct_list,
4135 construct_type_t *iter = construct_list;
4136 for( ; iter != NULL; iter = iter->next) {
4137 switch(iter->kind) {
4138 case CONSTRUCT_INVALID:
4139 internal_errorf(HERE, "invalid type construction found");
4140 case CONSTRUCT_FUNCTION: {
4141 construct_function_type_t *construct_function_type
4142 = (construct_function_type_t*) iter;
4144 type_t *function_type = construct_function_type->function_type;
4146 function_type->function.return_type = type;
4148 type_t *skipped_return_type = skip_typeref(type);
4149 if (is_type_function(skipped_return_type)) {
4150 errorf(HERE, "function returning function is not allowed");
4151 type = type_error_type;
4152 } else if (is_type_array(skipped_return_type)) {
4153 errorf(HERE, "function returning array is not allowed");
4154 type = type_error_type;
4156 type = function_type;
4161 case CONSTRUCT_POINTER: {
4162 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4163 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
4164 pointer_type->pointer.points_to = type;
4165 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
4167 type = pointer_type;
4171 case CONSTRUCT_ARRAY: {
4172 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4173 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
4175 expression_t *size_expression = parsed_array->size;
4176 if (size_expression != NULL) {
4178 = create_implicit_cast(size_expression, type_size_t);
4181 array_type->base.qualifiers = parsed_array->type_qualifiers;
4182 array_type->array.element_type = type;
4183 array_type->array.is_static = parsed_array->is_static;
4184 array_type->array.is_variable = parsed_array->is_variable;
4185 array_type->array.size_expression = size_expression;
4187 if (size_expression != NULL) {
4188 if (is_constant_expression(size_expression)) {
4189 array_type->array.size_constant = true;
4190 array_type->array.size
4191 = fold_constant(size_expression);
4193 array_type->array.is_vla = true;
4197 type_t *skipped_type = skip_typeref(type);
4198 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
4199 errorf(HERE, "array of void is not allowed");
4200 type = type_error_type;
4208 type_t *hashed_type = typehash_insert(type);
4209 if (hashed_type != type) {
4210 /* the function type was constructed earlier freeing it here will
4211 * destroy other types... */
4212 if (iter->kind != CONSTRUCT_FUNCTION) {
4222 static declaration_t *parse_declarator(
4223 const declaration_specifiers_t *specifiers, bool may_be_abstract)
4225 declaration_t *const declaration = allocate_declaration_zero();
4226 declaration->source_position = specifiers->source_position;
4227 declaration->declared_storage_class = specifiers->declared_storage_class;
4228 declaration->modifiers = specifiers->modifiers;
4229 declaration->deprecated_string = specifiers->deprecated_string;
4230 declaration->get_property_sym = specifiers->get_property_sym;
4231 declaration->put_property_sym = specifiers->put_property_sym;
4232 declaration->is_inline = specifiers->is_inline;
4234 declaration->storage_class = specifiers->declared_storage_class;
4235 if (declaration->storage_class == STORAGE_CLASS_NONE
4236 && scope != global_scope) {
4237 declaration->storage_class = STORAGE_CLASS_AUTO;
4240 if (specifiers->alignment != 0) {
4241 /* TODO: add checks here */
4242 declaration->alignment = specifiers->alignment;
4245 construct_type_t *construct_type
4246 = parse_inner_declarator(declaration, may_be_abstract);
4247 type_t *const type = specifiers->type;
4248 declaration->type = construct_declarator_type(construct_type, type);
4250 parse_declaration_attributes(declaration);
4252 fix_declaration_type(declaration);
4254 if (construct_type != NULL) {
4255 obstack_free(&temp_obst, construct_type);
4261 static type_t *parse_abstract_declarator(type_t *base_type)
4263 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4265 type_t *result = construct_declarator_type(construct_type, base_type);
4266 if (construct_type != NULL) {
4267 obstack_free(&temp_obst, construct_type);
4273 static declaration_t *append_declaration(declaration_t* const declaration)
4275 if (last_declaration != NULL) {
4276 last_declaration->next = declaration;
4278 scope->declarations = declaration;
4280 last_declaration = declaration;
4285 * Check if the declaration of main is suspicious. main should be a
4286 * function with external linkage, returning int, taking either zero
4287 * arguments, two, or three arguments of appropriate types, ie.
4289 * int main([ int argc, char **argv [, char **env ] ]).
4291 * @param decl the declaration to check
4292 * @param type the function type of the declaration
4294 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4296 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4297 warningf(&decl->source_position,
4298 "'main' is normally a non-static function");
4300 if (skip_typeref(func_type->return_type) != type_int) {
4301 warningf(&decl->source_position,
4302 "return type of 'main' should be 'int', but is '%T'",
4303 func_type->return_type);
4305 const function_parameter_t *parm = func_type->parameters;
4307 type_t *const first_type = parm->type;
4308 if (!types_compatible(skip_typeref(first_type), type_int)) {
4309 warningf(&decl->source_position,
4310 "first argument of 'main' should be 'int', but is '%T'", first_type);
4314 type_t *const second_type = parm->type;
4315 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4316 warningf(&decl->source_position,
4317 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4321 type_t *const third_type = parm->type;
4322 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4323 warningf(&decl->source_position,
4324 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4328 goto warn_arg_count;
4332 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4338 * Check if a symbol is the equal to "main".
4340 static bool is_sym_main(const symbol_t *const sym)
4342 return strcmp(sym->string, "main") == 0;
4345 static declaration_t *record_declaration(
4346 declaration_t *const declaration,
4347 const bool is_definition)
4349 const symbol_t *const symbol = declaration->symbol;
4350 const namespace_t namespc = (namespace_t)declaration->namespc;
4352 assert(symbol != NULL);
4353 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4355 type_t *const orig_type = declaration->type;
4356 type_t *const type = skip_typeref(orig_type);
4357 if (is_type_function(type) &&
4358 type->function.unspecified_parameters &&
4359 warning.strict_prototypes &&
4360 previous_declaration == NULL) {
4361 warningf(&declaration->source_position,
4362 "function declaration '%#T' is not a prototype",
4363 orig_type, declaration->symbol);
4366 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4367 check_type_of_main(declaration, &type->function);
4370 if (warning.nested_externs &&
4371 declaration->storage_class == STORAGE_CLASS_EXTERN &&
4372 scope != global_scope) {
4373 warningf(&declaration->source_position,
4374 "nested extern declaration of '%#T'", declaration->type, symbol);
4377 assert(declaration != previous_declaration);
4378 if (previous_declaration != NULL
4379 && previous_declaration->parent_scope == scope) {
4380 /* can happen for K&R style declarations */
4381 if (previous_declaration->type == NULL) {
4382 previous_declaration->type = declaration->type;
4385 const type_t *prev_type = skip_typeref(previous_declaration->type);
4386 if (!types_compatible(type, prev_type)) {
4387 errorf(&declaration->source_position,
4388 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4389 orig_type, symbol, previous_declaration->type, symbol,
4390 &previous_declaration->source_position);
4392 unsigned old_storage_class = previous_declaration->storage_class;
4393 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4394 errorf(&declaration->source_position,
4395 "redeclaration of enum entry '%Y' (declared %P)",
4396 symbol, &previous_declaration->source_position);
4397 return previous_declaration;
4400 if (warning.redundant_decls &&
4402 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4403 !(previous_declaration->modifiers & DM_USED) &&
4404 !previous_declaration->used) {
4405 warningf(&previous_declaration->source_position,
4406 "unnecessary static forward declaration for '%#T'",
4407 previous_declaration->type, symbol);
4410 unsigned new_storage_class = declaration->storage_class;
4412 if (is_type_incomplete(prev_type)) {
4413 previous_declaration->type = type;
4417 /* pretend no storage class means extern for function
4418 * declarations (except if the previous declaration is neither
4419 * none nor extern) */
4420 if (is_type_function(type)) {
4421 if (prev_type->function.unspecified_parameters) {
4422 previous_declaration->type = type;
4426 switch (old_storage_class) {
4427 case STORAGE_CLASS_NONE:
4428 old_storage_class = STORAGE_CLASS_EXTERN;
4431 case STORAGE_CLASS_EXTERN:
4432 if (is_definition) {
4433 if (warning.missing_prototypes &&
4434 prev_type->function.unspecified_parameters &&
4435 !is_sym_main(symbol)) {
4436 warningf(&declaration->source_position,
4437 "no previous prototype for '%#T'",
4440 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4441 new_storage_class = STORAGE_CLASS_EXTERN;
4450 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4451 new_storage_class == STORAGE_CLASS_EXTERN) {
4452 warn_redundant_declaration:
4453 if (!is_definition &&
4454 warning.redundant_decls &&
4455 is_type_valid(prev_type) &&
4456 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4457 warningf(&declaration->source_position,
4458 "redundant declaration for '%Y' (declared %P)",
4459 symbol, &previous_declaration->source_position);
4461 } else if (current_function == NULL) {
4462 if (old_storage_class != STORAGE_CLASS_STATIC &&
4463 new_storage_class == STORAGE_CLASS_STATIC) {
4464 errorf(&declaration->source_position,
4465 "static declaration of '%Y' follows non-static declaration (declared %P)",
4466 symbol, &previous_declaration->source_position);
4467 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4468 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4469 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4471 goto warn_redundant_declaration;
4473 } else if (is_type_valid(prev_type)) {
4474 if (old_storage_class == new_storage_class) {
4475 errorf(&declaration->source_position,
4476 "redeclaration of '%Y' (declared %P)",
4477 symbol, &previous_declaration->source_position);
4479 errorf(&declaration->source_position,
4480 "redeclaration of '%Y' with different linkage (declared %P)",
4481 symbol, &previous_declaration->source_position);
4486 previous_declaration->modifiers |= declaration->modifiers;
4487 previous_declaration->is_inline |= declaration->is_inline;
4488 return previous_declaration;
4489 } else if (is_type_function(type)) {
4490 if (is_definition &&
4491 declaration->storage_class != STORAGE_CLASS_STATIC) {
4492 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4493 warningf(&declaration->source_position,
4494 "no previous prototype for '%#T'", orig_type, symbol);
4495 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4496 warningf(&declaration->source_position,
4497 "no previous declaration for '%#T'", orig_type,
4502 if (warning.missing_declarations &&
4503 scope == global_scope && (
4504 declaration->storage_class == STORAGE_CLASS_NONE ||
4505 declaration->storage_class == STORAGE_CLASS_THREAD
4507 warningf(&declaration->source_position,
4508 "no previous declaration for '%#T'", orig_type, symbol);
4512 assert(declaration->parent_scope == NULL);
4513 assert(scope != NULL);
4515 declaration->parent_scope = scope;
4517 environment_push(declaration);
4518 return append_declaration(declaration);
4521 static void parser_error_multiple_definition(declaration_t *declaration,
4522 const source_position_t *source_position)
4524 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4525 declaration->symbol, &declaration->source_position);
4528 static bool is_declaration_specifier(const token_t *token,
4529 bool only_specifiers_qualifiers)
4531 switch(token->type) {
4536 return is_typedef_symbol(token->v.symbol);
4538 case T___extension__:
4540 return !only_specifiers_qualifiers;
4547 static void parse_init_declarator_rest(declaration_t *declaration)
4551 type_t *orig_type = declaration->type;
4552 type_t *type = skip_typeref(orig_type);
4554 if (declaration->init.initializer != NULL) {
4555 parser_error_multiple_definition(declaration, HERE);
4558 bool must_be_constant = false;
4559 if (declaration->storage_class == STORAGE_CLASS_STATIC
4560 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4561 || declaration->parent_scope == global_scope) {
4562 must_be_constant = true;
4565 if (is_type_function(type)) {
4566 errorf(&declaration->source_position,
4567 "function '%#T' is initialized like a variable",
4568 orig_type, declaration->symbol);
4569 orig_type = type_error_type;
4572 parse_initializer_env_t env;
4573 env.type = orig_type;
4574 env.must_be_constant = must_be_constant;
4575 env.declaration = current_init_decl = declaration;
4577 initializer_t *initializer = parse_initializer(&env);
4578 current_init_decl = NULL;
4580 if (!is_type_function(type)) {
4581 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
4582 * the array type size */
4583 declaration->type = env.type;
4584 declaration->init.initializer = initializer;
4588 /* parse rest of a declaration without any declarator */
4589 static void parse_anonymous_declaration_rest(
4590 const declaration_specifiers_t *specifiers)
4594 declaration_t *const declaration = allocate_declaration_zero();
4595 declaration->type = specifiers->type;
4596 declaration->declared_storage_class = specifiers->declared_storage_class;
4597 declaration->source_position = specifiers->source_position;
4598 declaration->modifiers = specifiers->modifiers;
4600 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4601 warningf(&declaration->source_position,
4602 "useless storage class in empty declaration");
4604 declaration->storage_class = STORAGE_CLASS_NONE;
4606 type_t *type = declaration->type;
4607 switch (type->kind) {
4608 case TYPE_COMPOUND_STRUCT:
4609 case TYPE_COMPOUND_UNION: {
4610 if (type->compound.declaration->symbol == NULL) {
4611 warningf(&declaration->source_position,
4612 "unnamed struct/union that defines no instances");
4621 warningf(&declaration->source_position, "empty declaration");
4625 append_declaration(declaration);
4628 static void parse_declaration_rest(declaration_t *ndeclaration,
4629 const declaration_specifiers_t *specifiers,
4630 parsed_declaration_func finished_declaration)
4632 add_anchor_token(';');
4633 add_anchor_token('=');
4634 add_anchor_token(',');
4636 declaration_t *declaration =
4637 finished_declaration(ndeclaration, token.type == '=');
4639 type_t *orig_type = declaration->type;
4640 type_t *type = skip_typeref(orig_type);
4642 if (type->kind != TYPE_FUNCTION &&
4643 declaration->is_inline &&
4644 is_type_valid(type)) {
4645 warningf(&declaration->source_position,
4646 "variable '%Y' declared 'inline'\n", declaration->symbol);
4649 if (token.type == '=') {
4650 parse_init_declarator_rest(declaration);
4653 if (token.type != ',')
4657 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4662 rem_anchor_token(';');
4663 rem_anchor_token('=');
4664 rem_anchor_token(',');
4667 static declaration_t *finished_kr_declaration(declaration_t *declaration, bool is_definition)
4669 symbol_t *symbol = declaration->symbol;
4670 if (symbol == NULL) {
4671 errorf(HERE, "anonymous declaration not valid as function parameter");
4674 namespace_t namespc = (namespace_t) declaration->namespc;
4675 if (namespc != NAMESPACE_NORMAL) {
4676 return record_declaration(declaration, false);
4679 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4680 if (previous_declaration == NULL ||
4681 previous_declaration->parent_scope != scope) {
4682 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4687 if (is_definition) {
4688 errorf(HERE, "parameter %Y is initialised", declaration->symbol);
4691 if (previous_declaration->type == NULL) {
4692 previous_declaration->type = declaration->type;
4693 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4694 previous_declaration->storage_class = declaration->storage_class;
4695 previous_declaration->parent_scope = scope;
4696 return previous_declaration;
4698 return record_declaration(declaration, false);
4702 static void parse_declaration(parsed_declaration_func finished_declaration)
4704 declaration_specifiers_t specifiers;
4705 memset(&specifiers, 0, sizeof(specifiers));
4706 parse_declaration_specifiers(&specifiers);
4708 if (token.type == ';') {
4709 parse_anonymous_declaration_rest(&specifiers);
4711 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4712 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4716 static type_t *get_default_promoted_type(type_t *orig_type)
4718 type_t *result = orig_type;
4720 type_t *type = skip_typeref(orig_type);
4721 if (is_type_integer(type)) {
4722 result = promote_integer(type);
4723 } else if (type == type_float) {
4724 result = type_double;
4730 static void parse_kr_declaration_list(declaration_t *declaration)
4732 type_t *type = skip_typeref(declaration->type);
4733 if (!is_type_function(type))
4736 if (!type->function.kr_style_parameters)
4739 /* push function parameters */
4740 int top = environment_top();
4741 scope_t *last_scope = scope;
4742 set_scope(&declaration->scope);
4744 declaration_t *parameter = declaration->scope.declarations;
4745 for ( ; parameter != NULL; parameter = parameter->next) {
4746 assert(parameter->parent_scope == NULL);
4747 parameter->parent_scope = scope;
4748 environment_push(parameter);
4751 /* parse declaration list */
4752 while (is_declaration_specifier(&token, false)) {
4753 parse_declaration(finished_kr_declaration);
4756 /* pop function parameters */
4757 assert(scope == &declaration->scope);
4758 set_scope(last_scope);
4759 environment_pop_to(top);
4761 /* update function type */
4762 type_t *new_type = duplicate_type(type);
4764 function_parameter_t *parameters = NULL;
4765 function_parameter_t *last_parameter = NULL;
4767 declaration_t *parameter_declaration = declaration->scope.declarations;
4768 for( ; parameter_declaration != NULL;
4769 parameter_declaration = parameter_declaration->next) {
4770 type_t *parameter_type = parameter_declaration->type;
4771 if (parameter_type == NULL) {
4773 errorf(HERE, "no type specified for function parameter '%Y'",
4774 parameter_declaration->symbol);
4776 if (warning.implicit_int) {
4777 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4778 parameter_declaration->symbol);
4780 parameter_type = type_int;
4781 parameter_declaration->type = parameter_type;
4785 semantic_parameter(parameter_declaration);
4786 parameter_type = parameter_declaration->type;
4789 * we need the default promoted types for the function type
4791 parameter_type = get_default_promoted_type(parameter_type);
4793 function_parameter_t *function_parameter
4794 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4795 memset(function_parameter, 0, sizeof(function_parameter[0]));
4797 function_parameter->type = parameter_type;
4798 if (last_parameter != NULL) {
4799 last_parameter->next = function_parameter;
4801 parameters = function_parameter;
4803 last_parameter = function_parameter;
4806 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4808 new_type->function.parameters = parameters;
4809 new_type->function.unspecified_parameters = true;
4811 type = typehash_insert(new_type);
4812 if (type != new_type) {
4813 obstack_free(type_obst, new_type);
4816 declaration->type = type;
4819 static bool first_err = true;
4822 * When called with first_err set, prints the name of the current function,
4825 static void print_in_function(void)
4829 diagnosticf("%s: In function '%Y':\n",
4830 current_function->source_position.input_name,
4831 current_function->symbol);
4836 * Check if all labels are defined in the current function.
4837 * Check if all labels are used in the current function.
4839 static void check_labels(void)
4841 for (const goto_statement_t *goto_statement = goto_first;
4842 goto_statement != NULL;
4843 goto_statement = goto_statement->next) {
4844 /* skip computed gotos */
4845 if (goto_statement->expression != NULL)
4848 declaration_t *label = goto_statement->label;
4851 if (label->source_position.input_name == NULL) {
4852 print_in_function();
4853 errorf(&goto_statement->base.source_position,
4854 "label '%Y' used but not defined", label->symbol);
4857 goto_first = goto_last = NULL;
4859 if (warning.unused_label) {
4860 for (const label_statement_t *label_statement = label_first;
4861 label_statement != NULL;
4862 label_statement = label_statement->next) {
4863 const declaration_t *label = label_statement->label;
4865 if (! label->used) {
4866 print_in_function();
4867 warningf(&label_statement->base.source_position,
4868 "label '%Y' defined but not used", label->symbol);
4872 label_first = label_last = NULL;
4876 * Check declarations of current_function for unused entities.
4878 static void check_declarations(void)
4880 if (warning.unused_parameter) {
4881 const scope_t *scope = ¤t_function->scope;
4883 if (is_sym_main(current_function->symbol)) {
4884 /* do not issue unused warnings for main */
4887 const declaration_t *parameter = scope->declarations;
4888 for (; parameter != NULL; parameter = parameter->next) {
4889 if (! parameter->used) {
4890 print_in_function();
4891 warningf(¶meter->source_position,
4892 "unused parameter '%Y'", parameter->symbol);
4896 if (warning.unused_variable) {
4900 static int determine_truth(expression_t const* const cond)
4903 !is_constant_expression(cond) ? 0 :
4904 fold_constant(cond) != 0 ? 1 :
4908 static bool noreturn_candidate;
4910 static void check_reachable(statement_t *const stmt)
4912 if (stmt->base.reachable)
4914 if (stmt->kind != STATEMENT_DO_WHILE)
4915 stmt->base.reachable = true;
4917 statement_t *last = stmt;
4919 switch (stmt->kind) {
4920 case STATEMENT_INVALID:
4921 case STATEMENT_EMPTY:
4922 case STATEMENT_DECLARATION:
4924 next = stmt->base.next;
4927 case STATEMENT_COMPOUND:
4928 next = stmt->compound.statements;
4931 case STATEMENT_RETURN:
4932 noreturn_candidate = false;
4935 case STATEMENT_IF: {
4936 if_statement_t const* const ifs = &stmt->ifs;
4937 int const val = determine_truth(ifs->condition);
4940 check_reachable(ifs->true_statement);
4945 if (ifs->false_statement != NULL) {
4946 check_reachable(ifs->false_statement);
4950 next = stmt->base.next;
4954 case STATEMENT_SWITCH: {
4955 switch_statement_t const *const switchs = &stmt->switchs;
4956 expression_t const *const expr = switchs->expression;
4958 if (is_constant_expression(expr)) {
4959 long const val = fold_constant(expr);
4960 case_label_statement_t * defaults = NULL;
4961 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4962 if (i->expression == NULL) {
4967 if (i->first_case <= val && val <= i->last_case) {
4968 check_reachable((statement_t*)i);
4973 if (defaults != NULL) {
4974 check_reachable((statement_t*)defaults);
4978 bool has_default = false;
4979 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4980 if (i->expression == NULL)
4983 check_reachable((statement_t*)i);
4990 next = stmt->base.next;
4994 case STATEMENT_EXPRESSION: {
4995 /* Check for noreturn function call */
4996 expression_t const *const expr = stmt->expression.expression;
4997 if (expr->kind == EXPR_CALL) {
4998 expression_t const *const func = expr->call.function;
4999 if (func->kind == EXPR_REFERENCE) {
5000 declaration_t const *const decl = func->reference.declaration;
5001 if (decl != NULL && decl->modifiers & DM_NORETURN) {
5007 next = stmt->base.next;
5011 case STATEMENT_CONTINUE: {
5012 statement_t *parent = stmt;
5014 parent = parent->base.parent;
5015 if (parent == NULL) /* continue not within loop */
5019 switch (parent->kind) {
5020 case STATEMENT_WHILE: goto continue_while;
5021 case STATEMENT_DO_WHILE: goto continue_do_while;
5022 case STATEMENT_FOR: goto continue_for;
5029 case STATEMENT_BREAK: {
5030 statement_t *parent = stmt;
5032 parent = parent->base.parent;
5033 if (parent == NULL) /* break not within loop/switch */
5036 switch (parent->kind) {
5037 case STATEMENT_SWITCH:
5038 case STATEMENT_WHILE:
5039 case STATEMENT_DO_WHILE:
5042 next = parent->base.next;
5043 goto found_break_parent;
5052 case STATEMENT_GOTO:
5053 if (stmt->gotos.expression) {
5054 statement_t *parent = stmt->base.parent;
5055 if (parent == NULL) /* top level goto */
5059 next = stmt->gotos.label->init.statement;
5060 if (next == NULL) /* missing label */
5065 case STATEMENT_LABEL:
5066 next = stmt->label.statement;
5069 case STATEMENT_CASE_LABEL:
5070 next = stmt->case_label.statement;
5073 case STATEMENT_WHILE: {
5074 while_statement_t const *const whiles = &stmt->whiles;
5075 int const val = determine_truth(whiles->condition);
5078 check_reachable(whiles->body);
5083 next = stmt->base.next;
5087 case STATEMENT_DO_WHILE:
5088 next = stmt->do_while.body;
5091 case STATEMENT_FOR: {
5092 for_statement_t *const fors = &stmt->fors;
5094 if (fors->condition_reachable)
5096 fors->condition_reachable = true;
5098 expression_t const *const cond = fors->condition;
5100 cond == NULL ? 1 : determine_truth(cond);
5103 check_reachable(fors->body);
5108 next = stmt->base.next;
5112 case STATEMENT_MS_TRY: {
5113 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5114 check_reachable(ms_try->try_statement);
5115 next = ms_try->final_statement;
5119 case STATEMENT_LEAVE: {
5120 statement_t *parent = stmt;
5122 parent = parent->base.parent;
5123 if (parent == NULL) /* __leave not within __try */
5126 if (parent->kind == STATEMENT_MS_TRY) {
5128 next = parent->ms_try.final_statement;
5136 while (next == NULL) {
5137 next = last->base.parent;
5139 noreturn_candidate = false;
5141 type_t *const type = current_function->type;
5142 assert(is_type_function(type));
5143 type_t *const ret = skip_typeref(type->function.return_type);
5144 if (warning.return_type &&
5145 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5146 is_type_valid(ret) &&
5147 !is_sym_main(current_function->symbol)) {
5148 warningf(&stmt->base.source_position,
5149 "control reaches end of non-void function");
5154 switch (next->kind) {
5155 case STATEMENT_INVALID:
5156 case STATEMENT_EMPTY:
5157 case STATEMENT_DECLARATION:
5158 case STATEMENT_EXPRESSION:
5160 case STATEMENT_RETURN:
5161 case STATEMENT_CONTINUE:
5162 case STATEMENT_BREAK:
5163 case STATEMENT_GOTO:
5164 case STATEMENT_LEAVE:
5165 panic("invalid control flow in function");
5167 case STATEMENT_COMPOUND:
5169 case STATEMENT_SWITCH:
5170 case STATEMENT_LABEL:
5171 case STATEMENT_CASE_LABEL:
5173 next = next->base.next;
5176 case STATEMENT_WHILE: {
5178 if (next->base.reachable)
5180 next->base.reachable = true;
5182 while_statement_t const *const whiles = &next->whiles;
5183 int const val = determine_truth(whiles->condition);
5186 check_reachable(whiles->body);
5192 next = next->base.next;
5196 case STATEMENT_DO_WHILE: {
5198 if (next->base.reachable)
5200 next->base.reachable = true;
5202 do_while_statement_t const *const dw = &next->do_while;
5203 int const val = determine_truth(dw->condition);
5206 check_reachable(dw->body);
5212 next = next->base.next;
5216 case STATEMENT_FOR: {
5218 for_statement_t *const fors = &next->fors;
5220 fors->step_reachable = true;
5222 if (fors->condition_reachable)
5224 fors->condition_reachable = true;
5226 expression_t const *const cond = fors->condition;
5228 cond == NULL ? 1 : determine_truth(cond);
5231 check_reachable(fors->body);
5237 next = next->base.next;
5241 case STATEMENT_MS_TRY:
5243 next = next->ms_try.final_statement;
5249 next = stmt->base.parent;
5251 warningf(&stmt->base.source_position,
5252 "control reaches end of non-void function");
5256 check_reachable(next);
5259 static void check_unreachable(statement_t const* const stmt)
5261 if (!stmt->base.reachable &&
5262 stmt->kind != STATEMENT_DO_WHILE &&
5263 stmt->kind != STATEMENT_FOR &&
5264 (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) {
5265 warningf(&stmt->base.source_position, "statement is unreachable");
5268 switch (stmt->kind) {
5269 case STATEMENT_INVALID:
5270 case STATEMENT_EMPTY:
5271 case STATEMENT_RETURN:
5272 case STATEMENT_DECLARATION:
5273 case STATEMENT_EXPRESSION:
5274 case STATEMENT_CONTINUE:
5275 case STATEMENT_BREAK:
5276 case STATEMENT_GOTO:
5278 case STATEMENT_LEAVE:
5281 case STATEMENT_COMPOUND:
5282 if (stmt->compound.statements)
5283 check_unreachable(stmt->compound.statements);
5287 check_unreachable(stmt->ifs.true_statement);
5288 if (stmt->ifs.false_statement != NULL)
5289 check_unreachable(stmt->ifs.false_statement);
5292 case STATEMENT_SWITCH:
5293 check_unreachable(stmt->switchs.body);
5296 case STATEMENT_LABEL:
5297 check_unreachable(stmt->label.statement);
5300 case STATEMENT_CASE_LABEL:
5301 check_unreachable(stmt->case_label.statement);
5304 case STATEMENT_WHILE:
5305 check_unreachable(stmt->whiles.body);
5308 case STATEMENT_DO_WHILE:
5309 check_unreachable(stmt->do_while.body);
5310 if (!stmt->base.reachable) {
5311 expression_t const *const cond = stmt->do_while.condition;
5312 if (determine_truth(cond) >= 0) {
5313 warningf(&cond->base.source_position,
5314 "condition of do-while-loop is unreachable");
5319 case STATEMENT_FOR: {
5320 for_statement_t const* const fors = &stmt->fors;
5322 // if init and step are unreachable, cond is unreachable, too
5323 if (!stmt->base.reachable && !fors->step_reachable) {
5324 warningf(&stmt->base.source_position, "statement is unreachable");
5326 if (!stmt->base.reachable && fors->initialisation != NULL) {
5327 warningf(&fors->initialisation->base.source_position,
5328 "initialisation of for-statement is unreachable");
5331 if (!fors->condition_reachable && fors->condition != NULL) {
5332 warningf(&fors->condition->base.source_position,
5333 "condition of for-statement is unreachable");
5336 if (!fors->step_reachable && fors->step != NULL) {
5337 warningf(&fors->step->base.source_position,
5338 "step of for-statement is unreachable");
5342 check_unreachable(fors->body);
5346 case STATEMENT_MS_TRY: {
5347 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5348 check_unreachable(ms_try->try_statement);
5349 check_unreachable(ms_try->final_statement);
5353 if (stmt->base.next)
5354 check_unreachable(stmt->base.next);
5357 static void parse_external_declaration(void)
5359 /* function-definitions and declarations both start with declaration
5361 declaration_specifiers_t specifiers;
5362 memset(&specifiers, 0, sizeof(specifiers));
5364 add_anchor_token(';');
5365 parse_declaration_specifiers(&specifiers);
5366 rem_anchor_token(';');
5368 /* must be a declaration */
5369 if (token.type == ';') {
5370 parse_anonymous_declaration_rest(&specifiers);
5374 add_anchor_token(',');
5375 add_anchor_token('=');
5376 rem_anchor_token(';');
5378 /* declarator is common to both function-definitions and declarations */
5379 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
5381 rem_anchor_token(',');
5382 rem_anchor_token('=');
5383 rem_anchor_token(';');
5385 /* must be a declaration */
5386 switch (token.type) {
5390 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
5394 /* must be a function definition */
5395 parse_kr_declaration_list(ndeclaration);
5397 if (token.type != '{') {
5398 parse_error_expected("while parsing function definition", '{', NULL);
5399 eat_until_matching_token(';');
5403 type_t *type = ndeclaration->type;
5405 /* note that we don't skip typerefs: the standard doesn't allow them here
5406 * (so we can't use is_type_function here) */
5407 if (type->kind != TYPE_FUNCTION) {
5408 if (is_type_valid(type)) {
5409 errorf(HERE, "declarator '%#T' has a body but is not a function type",
5410 type, ndeclaration->symbol);
5416 if (warning.aggregate_return &&
5417 is_type_compound(skip_typeref(type->function.return_type))) {
5418 warningf(HERE, "function '%Y' returns an aggregate",
5419 ndeclaration->symbol);
5421 if (warning.traditional && !type->function.unspecified_parameters) {
5422 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5423 ndeclaration->symbol);
5425 if (warning.old_style_definition && type->function.unspecified_parameters) {
5426 warningf(HERE, "old-style function definition '%Y'",
5427 ndeclaration->symbol);
5430 /* § 6.7.5.3 (14) a function definition with () means no
5431 * parameters (and not unspecified parameters) */
5432 if (type->function.unspecified_parameters
5433 && type->function.parameters == NULL
5434 && !type->function.kr_style_parameters) {
5435 type_t *duplicate = duplicate_type(type);
5436 duplicate->function.unspecified_parameters = false;
5438 type = typehash_insert(duplicate);
5439 if (type != duplicate) {
5440 obstack_free(type_obst, duplicate);
5442 ndeclaration->type = type;
5445 declaration_t *const declaration = record_declaration(ndeclaration, true);
5446 if (ndeclaration != declaration) {
5447 declaration->scope = ndeclaration->scope;
5449 type = skip_typeref(declaration->type);
5451 /* push function parameters and switch scope */
5452 int top = environment_top();
5453 scope_t *last_scope = scope;
5454 set_scope(&declaration->scope);
5456 declaration_t *parameter = declaration->scope.declarations;
5457 for( ; parameter != NULL; parameter = parameter->next) {
5458 if (parameter->parent_scope == &ndeclaration->scope) {
5459 parameter->parent_scope = scope;
5461 assert(parameter->parent_scope == NULL
5462 || parameter->parent_scope == scope);
5463 parameter->parent_scope = scope;
5464 if (parameter->symbol == NULL) {
5465 errorf(¶meter->source_position, "parameter name omitted");
5468 environment_push(parameter);
5471 if (declaration->init.statement != NULL) {
5472 parser_error_multiple_definition(declaration, HERE);
5475 /* parse function body */
5476 int label_stack_top = label_top();
5477 declaration_t *old_current_function = current_function;
5478 current_function = declaration;
5479 current_parent = NULL;
5481 statement_t *const body = parse_compound_statement(false);
5482 declaration->init.statement = body;
5485 check_declarations();
5486 if (warning.return_type ||
5487 warning.unreachable_code ||
5488 (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) {
5489 noreturn_candidate = true;
5490 check_reachable(body);
5491 if (warning.unreachable_code)
5492 check_unreachable(body);
5493 if (warning.missing_noreturn &&
5494 noreturn_candidate &&
5495 !(declaration->modifiers & DM_NORETURN)) {
5496 warningf(&body->base.source_position,
5497 "function '%#T' is candidate for attribute 'noreturn'",
5498 type, declaration->symbol);
5502 assert(current_parent == NULL);
5503 assert(current_function == declaration);
5504 current_function = old_current_function;
5505 label_pop_to(label_stack_top);
5508 assert(scope == &declaration->scope);
5509 set_scope(last_scope);
5510 environment_pop_to(top);
5513 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5514 source_position_t *source_position)
5516 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
5518 type->bitfield.base_type = base_type;
5519 type->bitfield.size = size;
5524 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
5527 declaration_t *iter = compound_declaration->scope.declarations;
5528 for( ; iter != NULL; iter = iter->next) {
5529 if (iter->namespc != NAMESPACE_NORMAL)
5532 if (iter->symbol == NULL) {
5533 type_t *type = skip_typeref(iter->type);
5534 if (is_type_compound(type)) {
5535 declaration_t *result
5536 = find_compound_entry(type->compound.declaration, symbol);
5543 if (iter->symbol == symbol) {
5551 static void parse_compound_declarators(declaration_t *struct_declaration,
5552 const declaration_specifiers_t *specifiers)
5554 declaration_t *last_declaration = struct_declaration->scope.declarations;
5555 if (last_declaration != NULL) {
5556 while (last_declaration->next != NULL) {
5557 last_declaration = last_declaration->next;
5562 declaration_t *declaration;
5564 if (token.type == ':') {
5565 source_position_t source_position = *HERE;
5568 type_t *base_type = specifiers->type;
5569 expression_t *size = parse_constant_expression();
5571 if (!is_type_integer(skip_typeref(base_type))) {
5572 errorf(HERE, "bitfield base type '%T' is not an integer type",
5576 type_t *type = make_bitfield_type(base_type, size, &source_position);
5578 declaration = allocate_declaration_zero();
5579 declaration->namespc = NAMESPACE_NORMAL;
5580 declaration->declared_storage_class = STORAGE_CLASS_NONE;
5581 declaration->storage_class = STORAGE_CLASS_NONE;
5582 declaration->source_position = source_position;
5583 declaration->modifiers = specifiers->modifiers;
5584 declaration->type = type;
5586 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
5588 type_t *orig_type = declaration->type;
5589 type_t *type = skip_typeref(orig_type);
5591 if (token.type == ':') {
5592 source_position_t source_position = *HERE;
5594 expression_t *size = parse_constant_expression();
5596 if (!is_type_integer(type)) {
5597 errorf(HERE, "bitfield base type '%T' is not an integer type",
5601 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
5602 declaration->type = bitfield_type;
5604 /* TODO we ignore arrays for now... what is missing is a check
5605 * that they're at the end of the struct */
5606 if (is_type_incomplete(type) && !is_type_array(type)) {
5608 "compound member '%Y' has incomplete type '%T'",
5609 declaration->symbol, orig_type);
5610 } else if (is_type_function(type)) {
5611 errorf(HERE, "compound member '%Y' must not have function type '%T'",
5612 declaration->symbol, orig_type);
5617 /* make sure we don't define a symbol multiple times */
5618 symbol_t *symbol = declaration->symbol;
5619 if (symbol != NULL) {
5620 declaration_t *prev_decl
5621 = find_compound_entry(struct_declaration, symbol);
5623 if (prev_decl != NULL) {
5624 assert(prev_decl->symbol == symbol);
5625 errorf(&declaration->source_position,
5626 "multiple declarations of symbol '%Y' (declared %P)",
5627 symbol, &prev_decl->source_position);
5631 /* append declaration */
5632 if (last_declaration != NULL) {
5633 last_declaration->next = declaration;
5635 struct_declaration->scope.declarations = declaration;
5637 last_declaration = declaration;
5639 if (token.type != ',')
5649 static void parse_compound_type_entries(declaration_t *compound_declaration)
5652 add_anchor_token('}');
5654 while (token.type != '}' && token.type != T_EOF) {
5655 declaration_specifiers_t specifiers;
5656 memset(&specifiers, 0, sizeof(specifiers));
5657 parse_declaration_specifiers(&specifiers);
5659 parse_compound_declarators(compound_declaration, &specifiers);
5661 rem_anchor_token('}');
5663 if (token.type == T_EOF) {
5664 errorf(HERE, "EOF while parsing struct");
5669 static type_t *parse_typename(void)
5671 declaration_specifiers_t specifiers;
5672 memset(&specifiers, 0, sizeof(specifiers));
5673 parse_declaration_specifiers(&specifiers);
5674 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
5675 /* TODO: improve error message, user does probably not know what a
5676 * storage class is...
5678 errorf(HERE, "typename may not have a storage class");
5681 type_t *result = parse_abstract_declarator(specifiers.type);
5689 typedef expression_t* (*parse_expression_function) (unsigned precedence);
5690 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
5691 expression_t *left);
5693 typedef struct expression_parser_function_t expression_parser_function_t;
5694 struct expression_parser_function_t {
5695 unsigned precedence;
5696 parse_expression_function parser;
5697 unsigned infix_precedence;
5698 parse_expression_infix_function infix_parser;
5701 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5704 * Prints an error message if an expression was expected but not read
5706 static expression_t *expected_expression_error(void)
5708 /* skip the error message if the error token was read */
5709 if (token.type != T_ERROR) {
5710 errorf(HERE, "expected expression, got token '%K'", &token);
5714 return create_invalid_expression();
5718 * Parse a string constant.
5720 static expression_t *parse_string_const(void)
5723 if (token.type == T_STRING_LITERAL) {
5724 string_t res = token.v.string;
5726 while (token.type == T_STRING_LITERAL) {
5727 res = concat_strings(&res, &token.v.string);
5730 if (token.type != T_WIDE_STRING_LITERAL) {
5731 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
5732 /* note: that we use type_char_ptr here, which is already the
5733 * automatic converted type. revert_automatic_type_conversion
5734 * will construct the array type */
5735 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
5736 cnst->string.value = res;
5740 wres = concat_string_wide_string(&res, &token.v.wide_string);
5742 wres = token.v.wide_string;
5747 switch (token.type) {
5748 case T_WIDE_STRING_LITERAL:
5749 wres = concat_wide_strings(&wres, &token.v.wide_string);
5752 case T_STRING_LITERAL:
5753 wres = concat_wide_string_string(&wres, &token.v.string);
5757 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5758 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5759 cnst->wide_string.value = wres;
5768 * Parse an integer constant.
5770 static expression_t *parse_int_const(void)
5772 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5773 cnst->base.source_position = *HERE;
5774 cnst->base.type = token.datatype;
5775 cnst->conste.v.int_value = token.v.intvalue;
5783 * Parse a character constant.
5785 static expression_t *parse_character_constant(void)
5787 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5789 cnst->base.source_position = *HERE;
5790 cnst->base.type = token.datatype;
5791 cnst->conste.v.character = token.v.string;
5793 if (cnst->conste.v.character.size != 1) {
5794 if (warning.multichar && (c_mode & _GNUC)) {
5796 warningf(HERE, "multi-character character constant");
5798 errorf(HERE, "more than 1 characters in character constant");
5807 * Parse a wide character constant.
5809 static expression_t *parse_wide_character_constant(void)
5811 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5813 cnst->base.source_position = *HERE;
5814 cnst->base.type = token.datatype;
5815 cnst->conste.v.wide_character = token.v.wide_string;
5817 if (cnst->conste.v.wide_character.size != 1) {
5818 if (warning.multichar && (c_mode & _GNUC)) {
5820 warningf(HERE, "multi-character character constant");
5822 errorf(HERE, "more than 1 characters in character constant");
5831 * Parse a float constant.
5833 static expression_t *parse_float_const(void)
5835 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5836 cnst->base.type = token.datatype;
5837 cnst->conste.v.float_value = token.v.floatvalue;
5844 static declaration_t *create_implicit_function(symbol_t *symbol,
5845 const source_position_t *source_position)
5847 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5848 ntype->function.return_type = type_int;
5849 ntype->function.unspecified_parameters = true;
5851 type_t *type = typehash_insert(ntype);
5852 if (type != ntype) {
5856 declaration_t *const declaration = allocate_declaration_zero();
5857 declaration->storage_class = STORAGE_CLASS_EXTERN;
5858 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5859 declaration->type = type;
5860 declaration->symbol = symbol;
5861 declaration->source_position = *source_position;
5862 declaration->implicit = true;
5864 bool strict_prototypes_old = warning.strict_prototypes;
5865 warning.strict_prototypes = false;
5866 record_declaration(declaration, false);
5867 warning.strict_prototypes = strict_prototypes_old;
5873 * Creates a return_type (func)(argument_type) function type if not
5876 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5877 type_t *argument_type2)
5879 function_parameter_t *parameter2
5880 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5881 memset(parameter2, 0, sizeof(parameter2[0]));
5882 parameter2->type = argument_type2;
5884 function_parameter_t *parameter1
5885 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5886 memset(parameter1, 0, sizeof(parameter1[0]));
5887 parameter1->type = argument_type1;
5888 parameter1->next = parameter2;
5890 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5891 type->function.return_type = return_type;
5892 type->function.parameters = parameter1;
5894 type_t *result = typehash_insert(type);
5895 if (result != type) {
5903 * Creates a return_type (func)(argument_type) function type if not
5906 * @param return_type the return type
5907 * @param argument_type the argument type
5909 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5911 function_parameter_t *parameter
5912 = obstack_alloc(type_obst, sizeof(parameter[0]));
5913 memset(parameter, 0, sizeof(parameter[0]));
5914 parameter->type = argument_type;
5916 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5917 type->function.return_type = return_type;
5918 type->function.parameters = parameter;
5920 type_t *result = typehash_insert(type);
5921 if (result != type) {
5928 static type_t *make_function_0_type(type_t *return_type)
5930 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5931 type->function.return_type = return_type;
5932 type->function.parameters = NULL;
5934 type_t *result = typehash_insert(type);
5935 if (result != type) {
5943 * Creates a function type for some function like builtins.
5945 * @param symbol the symbol describing the builtin
5947 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5949 switch(symbol->ID) {
5950 case T___builtin_alloca:
5951 return make_function_1_type(type_void_ptr, type_size_t);
5952 case T___builtin_huge_val:
5953 return make_function_0_type(type_double);
5954 case T___builtin_nan:
5955 return make_function_1_type(type_double, type_char_ptr);
5956 case T___builtin_nanf:
5957 return make_function_1_type(type_float, type_char_ptr);
5958 case T___builtin_nand:
5959 return make_function_1_type(type_long_double, type_char_ptr);
5960 case T___builtin_va_end:
5961 return make_function_1_type(type_void, type_valist);
5962 case T___builtin_expect:
5963 return make_function_2_type(type_long, type_long, type_long);
5965 internal_errorf(HERE, "not implemented builtin symbol found");
5970 * Performs automatic type cast as described in § 6.3.2.1.
5972 * @param orig_type the original type
5974 static type_t *automatic_type_conversion(type_t *orig_type)
5976 type_t *type = skip_typeref(orig_type);
5977 if (is_type_array(type)) {
5978 array_type_t *array_type = &type->array;
5979 type_t *element_type = array_type->element_type;
5980 unsigned qualifiers = array_type->base.qualifiers;
5982 return make_pointer_type(element_type, qualifiers);
5985 if (is_type_function(type)) {
5986 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
5993 * reverts the automatic casts of array to pointer types and function
5994 * to function-pointer types as defined § 6.3.2.1
5996 type_t *revert_automatic_type_conversion(const expression_t *expression)
5998 switch (expression->kind) {
5999 case EXPR_REFERENCE: return expression->reference.declaration->type;
6002 return get_qualified_type(expression->select.compound_entry->type,
6003 expression->base.type->base.qualifiers);
6005 case EXPR_UNARY_DEREFERENCE: {
6006 const expression_t *const value = expression->unary.value;
6007 type_t *const type = skip_typeref(value->base.type);
6008 assert(is_type_pointer(type));
6009 return type->pointer.points_to;
6012 case EXPR_BUILTIN_SYMBOL:
6013 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6015 case EXPR_ARRAY_ACCESS: {
6016 const expression_t *array_ref = expression->array_access.array_ref;
6017 type_t *type_left = skip_typeref(array_ref->base.type);
6018 if (!is_type_valid(type_left))
6020 assert(is_type_pointer(type_left));
6021 return type_left->pointer.points_to;
6024 case EXPR_STRING_LITERAL: {
6025 size_t size = expression->string.value.size;
6026 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6029 case EXPR_WIDE_STRING_LITERAL: {
6030 size_t size = expression->wide_string.value.size;
6031 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6034 case EXPR_COMPOUND_LITERAL:
6035 return expression->compound_literal.type;
6040 return expression->base.type;
6043 static expression_t *parse_reference(void)
6045 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
6047 reference_expression_t *ref = &expression->reference;
6048 symbol_t *const symbol = token.v.symbol;
6050 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
6052 if (declaration == NULL) {
6053 if (look_ahead(1)->type == '(') {
6054 /* an implicitly declared function */
6056 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6057 } else if (warning.implicit_function_declaration) {
6058 warningf(HERE, "implicit declaration of function '%Y'",
6062 declaration = create_implicit_function(symbol, HERE);
6064 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6065 declaration = create_error_declaration(symbol, STORAGE_CLASS_NONE);
6069 type_t *type = declaration->type;
6071 /* we always do the auto-type conversions; the & and sizeof parser contains
6072 * code to revert this! */
6073 type = automatic_type_conversion(type);
6075 ref->declaration = declaration;
6076 ref->base.type = type;
6078 /* this declaration is used */
6079 declaration->used = true;
6081 /* check for deprecated functions */
6082 if (warning.deprecated_declarations &&
6083 declaration->modifiers & DM_DEPRECATED) {
6084 char const *const prefix = is_type_function(declaration->type) ?
6085 "function" : "variable";
6087 if (declaration->deprecated_string != NULL) {
6088 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6089 prefix, declaration->symbol, &declaration->source_position,
6090 declaration->deprecated_string);
6092 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6093 declaration->symbol, &declaration->source_position);
6096 if (warning.init_self && declaration == current_init_decl) {
6097 current_init_decl = NULL;
6098 warningf(HERE, "variable '%#T' is initialized by itself",
6099 declaration->type, declaration->symbol);
6106 static bool semantic_cast(expression_t *cast)
6108 expression_t *expression = cast->unary.value;
6109 type_t *orig_dest_type = cast->base.type;
6110 type_t *orig_type_right = expression->base.type;
6111 type_t const *dst_type = skip_typeref(orig_dest_type);
6112 type_t const *src_type = skip_typeref(orig_type_right);
6113 source_position_t const *pos = &cast->base.source_position;
6115 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6116 if (dst_type == type_void)
6119 /* only integer and pointer can be casted to pointer */
6120 if (is_type_pointer(dst_type) &&
6121 !is_type_pointer(src_type) &&
6122 !is_type_integer(src_type) &&
6123 is_type_valid(src_type)) {
6124 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6128 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6129 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6133 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6134 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6138 if (warning.cast_qual &&
6139 is_type_pointer(src_type) &&
6140 is_type_pointer(dst_type)) {
6141 type_t *src = skip_typeref(src_type->pointer.points_to);
6142 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6143 unsigned missing_qualifiers =
6144 src->base.qualifiers & ~dst->base.qualifiers;
6145 if (missing_qualifiers != 0) {
6147 "cast discards qualifiers '%Q' in pointer target type of '%T'",
6148 missing_qualifiers, orig_type_right);
6154 static expression_t *parse_compound_literal(type_t *type)
6156 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6158 parse_initializer_env_t env;
6160 env.declaration = NULL;
6161 env.must_be_constant = false;
6162 initializer_t *initializer = parse_initializer(&env);
6165 expression->compound_literal.initializer = initializer;
6166 expression->compound_literal.type = type;
6167 expression->base.type = automatic_type_conversion(type);
6173 * Parse a cast expression.
6175 static expression_t *parse_cast(void)
6177 source_position_t source_position = token.source_position;
6179 type_t *type = parse_typename();
6181 /* matching add_anchor_token() is at call site */
6182 rem_anchor_token(')');
6185 if (token.type == '{') {
6186 return parse_compound_literal(type);
6189 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6190 cast->base.source_position = source_position;
6192 expression_t *value = parse_sub_expression(20);
6193 cast->base.type = type;
6194 cast->unary.value = value;
6196 if (! semantic_cast(cast)) {
6197 /* TODO: record the error in the AST. else it is impossible to detect it */
6202 return create_invalid_expression();
6206 * Parse a statement expression.
6208 static expression_t *parse_statement_expression(void)
6210 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6212 statement_t *statement = parse_compound_statement(true);
6213 expression->statement.statement = statement;
6214 expression->base.source_position = statement->base.source_position;
6216 /* find last statement and use its type */
6217 type_t *type = type_void;
6218 const statement_t *stmt = statement->compound.statements;
6220 while (stmt->base.next != NULL)
6221 stmt = stmt->base.next;
6223 if (stmt->kind == STATEMENT_EXPRESSION) {
6224 type = stmt->expression.expression->base.type;
6227 warningf(&expression->base.source_position, "empty statement expression ({})");
6229 expression->base.type = type;
6235 return create_invalid_expression();
6239 * Parse a parenthesized expression.
6241 static expression_t *parse_parenthesized_expression(void)
6244 add_anchor_token(')');
6246 switch(token.type) {
6248 /* gcc extension: a statement expression */
6249 return parse_statement_expression();
6253 return parse_cast();
6255 if (is_typedef_symbol(token.v.symbol)) {
6256 return parse_cast();
6260 expression_t *result = parse_expression();
6261 rem_anchor_token(')');
6266 return create_invalid_expression();
6269 static expression_t *parse_function_keyword(void)
6274 if (current_function == NULL) {
6275 errorf(HERE, "'__func__' used outside of a function");
6278 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6279 expression->base.type = type_char_ptr;
6280 expression->funcname.kind = FUNCNAME_FUNCTION;
6285 static expression_t *parse_pretty_function_keyword(void)
6287 eat(T___PRETTY_FUNCTION__);
6289 if (current_function == NULL) {
6290 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6293 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6294 expression->base.type = type_char_ptr;
6295 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6300 static expression_t *parse_funcsig_keyword(void)
6304 if (current_function == NULL) {
6305 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6308 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6309 expression->base.type = type_char_ptr;
6310 expression->funcname.kind = FUNCNAME_FUNCSIG;
6315 static expression_t *parse_funcdname_keyword(void)
6317 eat(T___FUNCDNAME__);
6319 if (current_function == NULL) {
6320 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6323 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6324 expression->base.type = type_char_ptr;
6325 expression->funcname.kind = FUNCNAME_FUNCDNAME;
6330 static designator_t *parse_designator(void)
6332 designator_t *result = allocate_ast_zero(sizeof(result[0]));
6333 result->source_position = *HERE;
6335 if (token.type != T_IDENTIFIER) {
6336 parse_error_expected("while parsing member designator",
6337 T_IDENTIFIER, NULL);
6340 result->symbol = token.v.symbol;
6343 designator_t *last_designator = result;
6345 if (token.type == '.') {
6347 if (token.type != T_IDENTIFIER) {
6348 parse_error_expected("while parsing member designator",
6349 T_IDENTIFIER, NULL);
6352 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6353 designator->source_position = *HERE;
6354 designator->symbol = token.v.symbol;
6357 last_designator->next = designator;
6358 last_designator = designator;
6361 if (token.type == '[') {
6363 add_anchor_token(']');
6364 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6365 designator->source_position = *HERE;
6366 designator->array_index = parse_expression();
6367 rem_anchor_token(']');
6369 if (designator->array_index == NULL) {
6373 last_designator->next = designator;
6374 last_designator = designator;
6386 * Parse the __builtin_offsetof() expression.
6388 static expression_t *parse_offsetof(void)
6390 eat(T___builtin_offsetof);
6392 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6393 expression->base.type = type_size_t;
6396 add_anchor_token(',');
6397 type_t *type = parse_typename();
6398 rem_anchor_token(',');
6400 add_anchor_token(')');
6401 designator_t *designator = parse_designator();
6402 rem_anchor_token(')');
6405 expression->offsetofe.type = type;
6406 expression->offsetofe.designator = designator;
6409 memset(&path, 0, sizeof(path));
6410 path.top_type = type;
6411 path.path = NEW_ARR_F(type_path_entry_t, 0);
6413 descend_into_subtype(&path);
6415 if (!walk_designator(&path, designator, true)) {
6416 return create_invalid_expression();
6419 DEL_ARR_F(path.path);
6423 return create_invalid_expression();
6427 * Parses a _builtin_va_start() expression.
6429 static expression_t *parse_va_start(void)
6431 eat(T___builtin_va_start);
6433 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6436 add_anchor_token(',');
6437 expression->va_starte.ap = parse_assignment_expression();
6438 rem_anchor_token(',');
6440 expression_t *const expr = parse_assignment_expression();
6441 if (expr->kind == EXPR_REFERENCE) {
6442 declaration_t *const decl = expr->reference.declaration;
6444 return create_invalid_expression();
6445 if (decl->parent_scope == ¤t_function->scope &&
6446 decl->next == NULL) {
6447 expression->va_starte.parameter = decl;
6452 errorf(&expr->base.source_position,
6453 "second argument of 'va_start' must be last parameter of the current function");
6455 return create_invalid_expression();
6459 * Parses a _builtin_va_arg() expression.
6461 static expression_t *parse_va_arg(void)
6463 eat(T___builtin_va_arg);
6465 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6468 expression->va_arge.ap = parse_assignment_expression();
6470 expression->base.type = parse_typename();
6475 return create_invalid_expression();
6478 static expression_t *parse_builtin_symbol(void)
6480 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
6482 symbol_t *symbol = token.v.symbol;
6484 expression->builtin_symbol.symbol = symbol;
6487 type_t *type = get_builtin_symbol_type(symbol);
6488 type = automatic_type_conversion(type);
6490 expression->base.type = type;
6495 * Parses a __builtin_constant() expression.
6497 static expression_t *parse_builtin_constant(void)
6499 eat(T___builtin_constant_p);
6501 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6504 add_anchor_token(')');
6505 expression->builtin_constant.value = parse_assignment_expression();
6506 rem_anchor_token(')');
6508 expression->base.type = type_int;
6512 return create_invalid_expression();
6516 * Parses a __builtin_prefetch() expression.
6518 static expression_t *parse_builtin_prefetch(void)
6520 eat(T___builtin_prefetch);
6522 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
6525 add_anchor_token(')');
6526 expression->builtin_prefetch.adr = parse_assignment_expression();
6527 if (token.type == ',') {
6529 expression->builtin_prefetch.rw = parse_assignment_expression();
6531 if (token.type == ',') {
6533 expression->builtin_prefetch.locality = parse_assignment_expression();
6535 rem_anchor_token(')');
6537 expression->base.type = type_void;
6541 return create_invalid_expression();
6545 * Parses a __builtin_is_*() compare expression.
6547 static expression_t *parse_compare_builtin(void)
6549 expression_t *expression;
6551 switch(token.type) {
6552 case T___builtin_isgreater:
6553 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6555 case T___builtin_isgreaterequal:
6556 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6558 case T___builtin_isless:
6559 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6561 case T___builtin_islessequal:
6562 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6564 case T___builtin_islessgreater:
6565 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6567 case T___builtin_isunordered:
6568 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6571 internal_errorf(HERE, "invalid compare builtin found");
6574 expression->base.source_position = *HERE;
6578 expression->binary.left = parse_assignment_expression();
6580 expression->binary.right = parse_assignment_expression();
6583 type_t *const orig_type_left = expression->binary.left->base.type;
6584 type_t *const orig_type_right = expression->binary.right->base.type;
6586 type_t *const type_left = skip_typeref(orig_type_left);
6587 type_t *const type_right = skip_typeref(orig_type_right);
6588 if (!is_type_float(type_left) && !is_type_float(type_right)) {
6589 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6590 type_error_incompatible("invalid operands in comparison",
6591 &expression->base.source_position, orig_type_left, orig_type_right);
6594 semantic_comparison(&expression->binary);
6599 return create_invalid_expression();
6604 * Parses a __builtin_expect() expression.
6606 static expression_t *parse_builtin_expect(void)
6608 eat(T___builtin_expect);
6610 expression_t *expression
6611 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
6614 expression->binary.left = parse_assignment_expression();
6616 expression->binary.right = parse_constant_expression();
6619 expression->base.type = expression->binary.left->base.type;
6623 return create_invalid_expression();
6628 * Parses a MS assume() expression.
6630 static expression_t *parse_assume(void)
6634 expression_t *expression
6635 = allocate_expression_zero(EXPR_UNARY_ASSUME);
6638 add_anchor_token(')');
6639 expression->unary.value = parse_assignment_expression();
6640 rem_anchor_token(')');
6643 expression->base.type = type_void;
6646 return create_invalid_expression();
6650 * Return the declaration for a given label symbol or create a new one.
6652 * @param symbol the symbol of the label
6654 static declaration_t *get_label(symbol_t *symbol)
6656 declaration_t *candidate;
6657 assert(current_function != NULL);
6659 candidate = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
6660 /* if we found a local label, we already created the declaration */
6661 if (candidate != NULL) {
6662 assert(candidate->parent_scope == scope);
6666 candidate = get_declaration(symbol, NAMESPACE_LABEL);
6667 /* if we found a label in the same function, then we already created the
6669 if (candidate != NULL
6670 && candidate->parent_scope == ¤t_function->scope) {
6674 /* otherwise we need to create a new one */
6675 declaration_t *const declaration = allocate_declaration_zero();
6676 declaration->namespc = NAMESPACE_LABEL;
6677 declaration->symbol = symbol;
6679 label_push(declaration);
6685 * Parses a GNU && label address expression.
6687 static expression_t *parse_label_address(void)
6689 source_position_t source_position = token.source_position;
6691 if (token.type != T_IDENTIFIER) {
6692 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6695 symbol_t *symbol = token.v.symbol;
6698 declaration_t *label = get_label(symbol);
6701 label->address_taken = true;
6703 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6704 expression->base.source_position = source_position;
6706 /* label address is threaten as a void pointer */
6707 expression->base.type = type_void_ptr;
6708 expression->label_address.declaration = label;
6711 return create_invalid_expression();
6715 * Parse a microsoft __noop expression.
6717 static expression_t *parse_noop_expression(void)
6719 source_position_t source_position = *HERE;
6722 if (token.type == '(') {
6723 /* parse arguments */
6725 add_anchor_token(')');
6726 add_anchor_token(',');
6728 if (token.type != ')') {
6730 (void)parse_assignment_expression();
6731 if (token.type != ',')
6737 rem_anchor_token(',');
6738 rem_anchor_token(')');
6741 /* the result is a (int)0 */
6742 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6743 cnst->base.source_position = source_position;
6744 cnst->base.type = type_int;
6745 cnst->conste.v.int_value = 0;
6746 cnst->conste.is_ms_noop = true;
6751 return create_invalid_expression();
6755 * Parses a primary expression.
6757 static expression_t *parse_primary_expression(void)
6759 switch (token.type) {
6760 case T_INTEGER: return parse_int_const();
6761 case T_CHARACTER_CONSTANT: return parse_character_constant();
6762 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
6763 case T_FLOATINGPOINT: return parse_float_const();
6764 case T_STRING_LITERAL:
6765 case T_WIDE_STRING_LITERAL: return parse_string_const();
6766 case T_IDENTIFIER: return parse_reference();
6767 case T___FUNCTION__:
6768 case T___func__: return parse_function_keyword();
6769 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
6770 case T___FUNCSIG__: return parse_funcsig_keyword();
6771 case T___FUNCDNAME__: return parse_funcdname_keyword();
6772 case T___builtin_offsetof: return parse_offsetof();
6773 case T___builtin_va_start: return parse_va_start();
6774 case T___builtin_va_arg: return parse_va_arg();
6775 case T___builtin_expect:
6776 case T___builtin_alloca:
6777 case T___builtin_nan:
6778 case T___builtin_nand:
6779 case T___builtin_nanf:
6780 case T___builtin_huge_val:
6781 case T___builtin_va_end: return parse_builtin_symbol();
6782 case T___builtin_isgreater:
6783 case T___builtin_isgreaterequal:
6784 case T___builtin_isless:
6785 case T___builtin_islessequal:
6786 case T___builtin_islessgreater:
6787 case T___builtin_isunordered: return parse_compare_builtin();
6788 case T___builtin_constant_p: return parse_builtin_constant();
6789 case T___builtin_prefetch: return parse_builtin_prefetch();
6790 case T__assume: return parse_assume();
6793 return parse_label_address();
6796 case '(': return parse_parenthesized_expression();
6797 case T___noop: return parse_noop_expression();
6800 errorf(HERE, "unexpected token %K, expected an expression", &token);
6801 return create_invalid_expression();
6805 * Check if the expression has the character type and issue a warning then.
6807 static void check_for_char_index_type(const expression_t *expression)
6809 type_t *const type = expression->base.type;
6810 const type_t *const base_type = skip_typeref(type);
6812 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
6813 warning.char_subscripts) {
6814 warningf(&expression->base.source_position,
6815 "array subscript has type '%T'", type);
6819 static expression_t *parse_array_expression(unsigned precedence,
6825 add_anchor_token(']');
6827 expression_t *inside = parse_expression();
6829 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6831 array_access_expression_t *array_access = &expression->array_access;
6833 type_t *const orig_type_left = left->base.type;
6834 type_t *const orig_type_inside = inside->base.type;
6836 type_t *const type_left = skip_typeref(orig_type_left);
6837 type_t *const type_inside = skip_typeref(orig_type_inside);
6839 type_t *return_type;
6840 if (is_type_pointer(type_left)) {
6841 return_type = type_left->pointer.points_to;
6842 array_access->array_ref = left;
6843 array_access->index = inside;
6844 check_for_char_index_type(inside);
6845 } else if (is_type_pointer(type_inside)) {
6846 return_type = type_inside->pointer.points_to;
6847 array_access->array_ref = inside;
6848 array_access->index = left;
6849 array_access->flipped = true;
6850 check_for_char_index_type(left);
6852 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
6854 "array access on object with non-pointer types '%T', '%T'",
6855 orig_type_left, orig_type_inside);
6857 return_type = type_error_type;
6858 array_access->array_ref = create_invalid_expression();
6861 rem_anchor_token(']');
6862 if (token.type != ']') {
6863 parse_error_expected("Problem while parsing array access", ']', NULL);
6868 return_type = automatic_type_conversion(return_type);
6869 expression->base.type = return_type;
6874 static expression_t *parse_typeprop(expression_kind_t const kind,
6875 source_position_t const pos,
6876 unsigned const precedence)
6878 expression_t *tp_expression = allocate_expression_zero(kind);
6879 tp_expression->base.type = type_size_t;
6880 tp_expression->base.source_position = pos;
6882 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6884 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6886 add_anchor_token(')');
6887 type_t* const orig_type = parse_typename();
6888 tp_expression->typeprop.type = orig_type;
6890 type_t const* const type = skip_typeref(orig_type);
6891 char const* const wrong_type =
6892 is_type_incomplete(type) ? "incomplete" :
6893 type->kind == TYPE_FUNCTION ? "function designator" :
6894 type->kind == TYPE_BITFIELD ? "bitfield" :
6896 if (wrong_type != NULL) {
6897 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6898 what, wrong_type, type);
6901 rem_anchor_token(')');
6904 expression_t *expression = parse_sub_expression(precedence);
6906 type_t* const orig_type = revert_automatic_type_conversion(expression);
6907 expression->base.type = orig_type;
6909 type_t const* const type = skip_typeref(orig_type);
6910 char const* const wrong_type =
6911 is_type_incomplete(type) ? "incomplete" :
6912 type->kind == TYPE_FUNCTION ? "function designator" :
6913 type->kind == TYPE_BITFIELD ? "bitfield" :
6915 if (wrong_type != NULL) {
6916 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6919 tp_expression->typeprop.type = expression->base.type;
6920 tp_expression->typeprop.tp_expression = expression;
6923 return tp_expression;
6925 return create_invalid_expression();
6928 static expression_t *parse_sizeof(unsigned precedence)
6930 source_position_t pos = *HERE;
6932 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
6935 static expression_t *parse_alignof(unsigned precedence)
6937 source_position_t pos = *HERE;
6939 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
6942 static expression_t *parse_select_expression(unsigned precedence,
6943 expression_t *compound)
6946 assert(token.type == '.' || token.type == T_MINUSGREATER);
6948 bool is_pointer = (token.type == T_MINUSGREATER);
6951 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6952 select->select.compound = compound;
6954 if (token.type != T_IDENTIFIER) {
6955 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6958 symbol_t *symbol = token.v.symbol;
6961 type_t *const orig_type = compound->base.type;
6962 type_t *const type = skip_typeref(orig_type);
6965 bool saw_error = false;
6966 if (is_type_pointer(type)) {
6969 "request for member '%Y' in something not a struct or union, but '%T'",
6973 type_left = skip_typeref(type->pointer.points_to);
6975 if (is_pointer && is_type_valid(type)) {
6976 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
6982 declaration_t *entry;
6983 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
6984 type_left->kind == TYPE_COMPOUND_UNION) {
6985 declaration_t *const declaration = type_left->compound.declaration;
6987 if (!declaration->init.complete) {
6988 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
6990 goto create_error_entry;
6993 entry = find_compound_entry(declaration, symbol);
6994 if (entry == NULL) {
6995 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
6996 goto create_error_entry;
6999 if (is_type_valid(type_left) && !saw_error) {
7001 "request for member '%Y' in something not a struct or union, but '%T'",
7005 entry = allocate_declaration_zero();
7006 entry->symbol = symbol;
7009 select->select.compound_entry = entry;
7011 type_t *const res_type =
7012 get_qualified_type(entry->type, type_left->base.qualifiers);
7014 /* we always do the auto-type conversions; the & and sizeof parser contains
7015 * code to revert this! */
7016 select->base.type = automatic_type_conversion(res_type);
7018 type_t *skipped = skip_typeref(res_type);
7019 if (skipped->kind == TYPE_BITFIELD) {
7020 select->base.type = skipped->bitfield.base_type;
7026 static void check_call_argument(const function_parameter_t *parameter,
7027 call_argument_t *argument, unsigned pos)
7029 type_t *expected_type = parameter->type;
7030 type_t *expected_type_skip = skip_typeref(expected_type);
7031 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7032 expression_t *arg_expr = argument->expression;
7033 type_t *arg_type = skip_typeref(arg_expr->base.type);
7035 /* handle transparent union gnu extension */
7036 if (is_type_union(expected_type_skip)
7037 && (expected_type_skip->base.modifiers
7038 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7039 declaration_t *union_decl = expected_type_skip->compound.declaration;
7041 declaration_t *declaration = union_decl->scope.declarations;
7042 type_t *best_type = NULL;
7043 for ( ; declaration != NULL; declaration = declaration->next) {
7044 type_t *decl_type = declaration->type;
7045 error = semantic_assign(decl_type, arg_expr);
7046 if (error == ASSIGN_ERROR_INCOMPATIBLE
7047 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7050 if (error == ASSIGN_SUCCESS) {
7051 best_type = decl_type;
7052 } else if (best_type == NULL) {
7053 best_type = decl_type;
7057 if (best_type != NULL) {
7058 expected_type = best_type;
7062 error = semantic_assign(expected_type, arg_expr);
7063 argument->expression = create_implicit_cast(argument->expression,
7066 if (error != ASSIGN_SUCCESS) {
7067 /* report exact scope in error messages (like "in argument 3") */
7069 snprintf(buf, sizeof(buf), "call argument %u", pos);
7070 report_assign_error(error, expected_type, arg_expr, buf,
7071 &arg_expr->base.source_position);
7072 } else if (warning.traditional | warning.conversion) {
7074 /* passing as integer instead of float or complex */
7075 (is_type_integer(expected_type) &&
7076 (is_type_float(arg_type) || is_type_complex(arg_type))) ||
7077 /* passing as complex instead of integer or float */
7078 (is_type_complex(expected_type) &&
7079 (is_type_integer(arg_type) || is_type_float(arg_type))) ||
7080 /* passing as float instead of integer or complex */
7081 (is_type_float(expected_type) &&
7082 (is_type_integer(arg_type) || is_type_complex(arg_type))) ||
7083 /* passing as float instead of double */
7084 (is_type_float(expected_type) && expected_type != type_double &&
7085 is_type_float(arg_type))) {
7086 warningf(&arg_expr->base.source_position,
7087 "passing call argument %u as '%T' rather than '%T' due to prototype",
7088 pos, expected_type, arg_type);
7090 if (is_type_integer(expected_type) && is_type_integer(arg_type)) {
7091 /* TODO check for size HERE */
7097 * Parse a call expression, ie. expression '( ... )'.
7099 * @param expression the function address
7101 static expression_t *parse_call_expression(unsigned precedence,
7102 expression_t *expression)
7105 expression_t *result = allocate_expression_zero(EXPR_CALL);
7106 result->base.source_position = expression->base.source_position;
7108 call_expression_t *call = &result->call;
7109 call->function = expression;
7111 type_t *const orig_type = expression->base.type;
7112 type_t *const type = skip_typeref(orig_type);
7114 function_type_t *function_type = NULL;
7115 if (is_type_pointer(type)) {
7116 type_t *const to_type = skip_typeref(type->pointer.points_to);
7118 if (is_type_function(to_type)) {
7119 function_type = &to_type->function;
7120 call->base.type = function_type->return_type;
7124 if (function_type == NULL && is_type_valid(type)) {
7125 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7128 /* parse arguments */
7130 add_anchor_token(')');
7131 add_anchor_token(',');
7133 if (token.type != ')') {
7134 call_argument_t *last_argument = NULL;
7137 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7139 argument->expression = parse_assignment_expression();
7140 if (last_argument == NULL) {
7141 call->arguments = argument;
7143 last_argument->next = argument;
7145 last_argument = argument;
7147 if (token.type != ',')
7152 rem_anchor_token(',');
7153 rem_anchor_token(')');
7156 if (function_type == NULL)
7159 function_parameter_t *parameter = function_type->parameters;
7160 call_argument_t *argument = call->arguments;
7161 if (!function_type->unspecified_parameters) {
7162 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7163 parameter = parameter->next, argument = argument->next) {
7164 check_call_argument(parameter, argument, ++pos);
7167 if (parameter != NULL) {
7168 errorf(HERE, "too few arguments to function '%E'", expression);
7169 } else if (argument != NULL && !function_type->variadic) {
7170 errorf(HERE, "too many arguments to function '%E'", expression);
7174 /* do default promotion */
7175 for( ; argument != NULL; argument = argument->next) {
7176 type_t *type = argument->expression->base.type;
7178 type = get_default_promoted_type(type);
7180 argument->expression
7181 = create_implicit_cast(argument->expression, type);
7184 check_format(&result->call);
7186 if (warning.aggregate_return &&
7187 is_type_compound(skip_typeref(function_type->return_type))) {
7188 warningf(&result->base.source_position,
7189 "function call has aggregate value");
7194 return create_invalid_expression();
7197 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7199 static bool same_compound_type(const type_t *type1, const type_t *type2)
7202 is_type_compound(type1) &&
7203 type1->kind == type2->kind &&
7204 type1->compound.declaration == type2->compound.declaration;
7208 * Parse a conditional expression, ie. 'expression ? ... : ...'.
7210 * @param expression the conditional expression
7212 static expression_t *parse_conditional_expression(unsigned precedence,
7213 expression_t *expression)
7215 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7217 conditional_expression_t *conditional = &result->conditional;
7218 conditional->base.source_position = *HERE;
7219 conditional->condition = expression;
7222 add_anchor_token(':');
7225 type_t *const condition_type_orig = expression->base.type;
7226 type_t *const condition_type = skip_typeref(condition_type_orig);
7227 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
7228 type_error("expected a scalar type in conditional condition",
7229 &expression->base.source_position, condition_type_orig);
7232 expression_t *true_expression = expression;
7233 bool gnu_cond = false;
7234 if ((c_mode & _GNUC) && token.type == ':') {
7237 true_expression = parse_expression();
7238 rem_anchor_token(':');
7240 expression_t *false_expression = parse_sub_expression(precedence);
7242 type_t *const orig_true_type = true_expression->base.type;
7243 type_t *const orig_false_type = false_expression->base.type;
7244 type_t *const true_type = skip_typeref(orig_true_type);
7245 type_t *const false_type = skip_typeref(orig_false_type);
7248 type_t *result_type;
7249 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7250 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7251 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
7252 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7253 warningf(&conditional->base.source_position,
7254 "ISO C forbids conditional expression with only one void side");
7256 result_type = type_void;
7257 } else if (is_type_arithmetic(true_type)
7258 && is_type_arithmetic(false_type)) {
7259 result_type = semantic_arithmetic(true_type, false_type);
7261 true_expression = create_implicit_cast(true_expression, result_type);
7262 false_expression = create_implicit_cast(false_expression, result_type);
7264 conditional->true_expression = true_expression;
7265 conditional->false_expression = false_expression;
7266 conditional->base.type = result_type;
7267 } else if (same_compound_type(true_type, false_type)) {
7268 /* just take 1 of the 2 types */
7269 result_type = true_type;
7270 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7271 type_t *pointer_type;
7273 expression_t *other_expression;
7274 if (is_type_pointer(true_type) &&
7275 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7276 pointer_type = true_type;
7277 other_type = false_type;
7278 other_expression = false_expression;
7280 pointer_type = false_type;
7281 other_type = true_type;
7282 other_expression = true_expression;
7285 if (is_null_pointer_constant(other_expression)) {
7286 result_type = pointer_type;
7287 } else if (is_type_pointer(other_type)) {
7288 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7289 type_t *to2 = skip_typeref(other_type->pointer.points_to);
7292 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7293 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7295 } else if (types_compatible(get_unqualified_type(to1),
7296 get_unqualified_type(to2))) {
7299 warningf(&conditional->base.source_position,
7300 "pointer types '%T' and '%T' in conditional expression are incompatible",
7301 true_type, false_type);
7305 type_t *const type =
7306 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7307 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7308 } else if (is_type_integer(other_type)) {
7309 warningf(&conditional->base.source_position,
7310 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7311 result_type = pointer_type;
7313 type_error_incompatible("while parsing conditional",
7314 &expression->base.source_position, true_type, false_type);
7315 result_type = type_error_type;
7318 /* TODO: one pointer to void*, other some pointer */
7320 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7321 type_error_incompatible("while parsing conditional",
7322 &conditional->base.source_position, true_type,
7325 result_type = type_error_type;
7328 conditional->true_expression
7329 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7330 conditional->false_expression
7331 = create_implicit_cast(false_expression, result_type);
7332 conditional->base.type = result_type;
7335 return create_invalid_expression();
7339 * Parse an extension expression.
7341 static expression_t *parse_extension(unsigned precedence)
7343 eat(T___extension__);
7345 /* TODO enable extensions */
7346 expression_t *expression = parse_sub_expression(precedence);
7347 /* TODO disable extensions */
7352 * Parse a __builtin_classify_type() expression.
7354 static expression_t *parse_builtin_classify_type(const unsigned precedence)
7356 eat(T___builtin_classify_type);
7358 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7359 result->base.type = type_int;
7362 add_anchor_token(')');
7363 expression_t *expression = parse_sub_expression(precedence);
7364 rem_anchor_token(')');
7366 result->classify_type.type_expression = expression;
7370 return create_invalid_expression();
7373 static bool check_pointer_arithmetic(const source_position_t *source_position,
7374 type_t *pointer_type,
7375 type_t *orig_pointer_type)
7377 type_t *points_to = pointer_type->pointer.points_to;
7378 points_to = skip_typeref(points_to);
7380 if (is_type_incomplete(points_to)) {
7381 if (!(c_mode & _GNUC) || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7382 errorf(source_position,
7383 "arithmetic with pointer to incomplete type '%T' not allowed",
7386 } else if (warning.pointer_arith) {
7387 warningf(source_position,
7388 "pointer of type '%T' used in arithmetic",
7391 } else if (is_type_function(points_to)) {
7392 if (!(c_mode && _GNUC)) {
7393 errorf(source_position,
7394 "arithmetic with pointer to function type '%T' not allowed",
7397 } else if (warning.pointer_arith) {
7398 warningf(source_position,
7399 "pointer to a function '%T' used in arithmetic",
7406 static bool is_lvalue(const expression_t *expression)
7408 switch (expression->kind) {
7409 case EXPR_REFERENCE:
7410 case EXPR_ARRAY_ACCESS:
7412 case EXPR_UNARY_DEREFERENCE:
7420 static void semantic_incdec(unary_expression_t *expression)
7422 type_t *const orig_type = expression->value->base.type;
7423 type_t *const type = skip_typeref(orig_type);
7424 if (is_type_pointer(type)) {
7425 if (!check_pointer_arithmetic(&expression->base.source_position,
7429 } else if (!is_type_real(type) && is_type_valid(type)) {
7430 /* TODO: improve error message */
7431 errorf(&expression->base.source_position,
7432 "operation needs an arithmetic or pointer type");
7435 if (!is_lvalue(expression->value)) {
7436 /* TODO: improve error message */
7437 errorf(&expression->base.source_position, "lvalue required as operand");
7439 expression->base.type = orig_type;
7442 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7444 type_t *const orig_type = expression->value->base.type;
7445 type_t *const type = skip_typeref(orig_type);
7446 if (!is_type_arithmetic(type)) {
7447 if (is_type_valid(type)) {
7448 /* TODO: improve error message */
7449 errorf(&expression->base.source_position,
7450 "operation needs an arithmetic type");
7455 expression->base.type = orig_type;
7458 static void semantic_unexpr_plus(unary_expression_t *expression)
7460 semantic_unexpr_arithmetic(expression);
7461 if (warning.traditional)
7462 warningf(&expression->base.source_position,
7463 "traditional C rejects the unary plus operator");
7466 static void semantic_not(unary_expression_t *expression)
7468 type_t *const orig_type = expression->value->base.type;
7469 type_t *const type = skip_typeref(orig_type);
7470 if (!is_type_scalar(type) && is_type_valid(type)) {
7471 errorf(&expression->base.source_position,
7472 "operand of ! must be of scalar type");
7475 expression->base.type = type_int;
7478 static void semantic_unexpr_integer(unary_expression_t *expression)
7480 type_t *const orig_type = expression->value->base.type;
7481 type_t *const type = skip_typeref(orig_type);
7482 if (!is_type_integer(type)) {
7483 if (is_type_valid(type)) {
7484 errorf(&expression->base.source_position,
7485 "operand of ~ must be of integer type");
7490 expression->base.type = orig_type;
7493 static void semantic_dereference(unary_expression_t *expression)
7495 type_t *const orig_type = expression->value->base.type;
7496 type_t *const type = skip_typeref(orig_type);
7497 if (!is_type_pointer(type)) {
7498 if (is_type_valid(type)) {
7499 errorf(&expression->base.source_position,
7500 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7505 type_t *result_type = type->pointer.points_to;
7506 result_type = automatic_type_conversion(result_type);
7507 expression->base.type = result_type;
7511 * Record that an address is taken (expression represents an lvalue).
7513 * @param expression the expression
7514 * @param may_be_register if true, the expression might be an register
7516 static void set_address_taken(expression_t *expression, bool may_be_register)
7518 if (expression->kind != EXPR_REFERENCE)
7521 declaration_t *const declaration = expression->reference.declaration;
7522 /* happens for parse errors */
7523 if (declaration == NULL)
7526 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
7527 errorf(&expression->base.source_position,
7528 "address of register variable '%Y' requested",
7529 declaration->symbol);
7531 declaration->address_taken = 1;
7536 * Check the semantic of the address taken expression.
7538 static void semantic_take_addr(unary_expression_t *expression)
7540 expression_t *value = expression->value;
7541 value->base.type = revert_automatic_type_conversion(value);
7543 type_t *orig_type = value->base.type;
7544 if (!is_type_valid(orig_type))
7547 set_address_taken(value, false);
7549 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7552 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
7553 static expression_t *parse_##unexpression_type(unsigned precedence) \
7555 expression_t *unary_expression \
7556 = allocate_expression_zero(unexpression_type); \
7557 unary_expression->base.source_position = *HERE; \
7559 unary_expression->unary.value = parse_sub_expression(precedence); \
7561 sfunc(&unary_expression->unary); \
7563 return unary_expression; \
7566 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7567 semantic_unexpr_arithmetic)
7568 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7569 semantic_unexpr_plus)
7570 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7572 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7573 semantic_dereference)
7574 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7576 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7577 semantic_unexpr_integer)
7578 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
7580 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7583 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7585 static expression_t *parse_##unexpression_type(unsigned precedence, \
7586 expression_t *left) \
7588 (void) precedence; \
7590 expression_t *unary_expression \
7591 = allocate_expression_zero(unexpression_type); \
7592 unary_expression->base.source_position = *HERE; \
7594 unary_expression->unary.value = left; \
7596 sfunc(&unary_expression->unary); \
7598 return unary_expression; \
7601 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7602 EXPR_UNARY_POSTFIX_INCREMENT,
7604 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7605 EXPR_UNARY_POSTFIX_DECREMENT,
7608 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7610 /* TODO: handle complex + imaginary types */
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) &&
7700 is_constant_expression(expression->right) &&
7701 fold_constant(expression->right) == 0) {
7702 warningf(&expression->base.source_position, "division by zero");
7707 * Check the semantic restrictions for a div/mod expression.
7709 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
7710 semantic_binexpr_arithmetic(expression);
7711 warn_div_by_zero(expression);
7714 static void semantic_shift_op(binary_expression_t *expression)
7716 expression_t *const left = expression->left;
7717 expression_t *const right = expression->right;
7718 type_t *const orig_type_left = left->base.type;
7719 type_t *const orig_type_right = right->base.type;
7720 type_t * type_left = skip_typeref(orig_type_left);
7721 type_t * type_right = skip_typeref(orig_type_right);
7723 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
7724 /* TODO: improve error message */
7725 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7726 errorf(&expression->base.source_position,
7727 "operands of shift operation must have integer types");
7732 type_left = promote_integer(type_left);
7733 type_right = promote_integer(type_right);
7735 expression->left = create_implicit_cast(left, type_left);
7736 expression->right = create_implicit_cast(right, type_right);
7737 expression->base.type = type_left;
7740 static void semantic_add(binary_expression_t *expression)
7742 expression_t *const left = expression->left;
7743 expression_t *const right = expression->right;
7744 type_t *const orig_type_left = left->base.type;
7745 type_t *const orig_type_right = right->base.type;
7746 type_t *const type_left = skip_typeref(orig_type_left);
7747 type_t *const type_right = skip_typeref(orig_type_right);
7750 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7751 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7752 expression->left = create_implicit_cast(left, arithmetic_type);
7753 expression->right = create_implicit_cast(right, arithmetic_type);
7754 expression->base.type = arithmetic_type;
7756 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7757 check_pointer_arithmetic(&expression->base.source_position,
7758 type_left, orig_type_left);
7759 expression->base.type = type_left;
7760 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
7761 check_pointer_arithmetic(&expression->base.source_position,
7762 type_right, orig_type_right);
7763 expression->base.type = type_right;
7764 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7765 errorf(&expression->base.source_position,
7766 "invalid operands to binary + ('%T', '%T')",
7767 orig_type_left, orig_type_right);
7771 static void semantic_sub(binary_expression_t *expression)
7773 expression_t *const left = expression->left;
7774 expression_t *const right = expression->right;
7775 type_t *const orig_type_left = left->base.type;
7776 type_t *const orig_type_right = right->base.type;
7777 type_t *const type_left = skip_typeref(orig_type_left);
7778 type_t *const type_right = skip_typeref(orig_type_right);
7779 source_position_t const *const pos = &expression->base.source_position;
7782 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7783 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7784 expression->left = create_implicit_cast(left, arithmetic_type);
7785 expression->right = create_implicit_cast(right, arithmetic_type);
7786 expression->base.type = arithmetic_type;
7788 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7789 check_pointer_arithmetic(&expression->base.source_position,
7790 type_left, orig_type_left);
7791 expression->base.type = type_left;
7792 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7793 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
7794 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
7795 if (!types_compatible(unqual_left, unqual_right)) {
7797 "subtracting pointers to incompatible types '%T' and '%T'",
7798 orig_type_left, orig_type_right);
7799 } else if (!is_type_object(unqual_left)) {
7800 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
7801 warningf(pos, "subtracting pointers to void");
7803 errorf(pos, "subtracting pointers to non-object types '%T'",
7807 expression->base.type = type_ptrdiff_t;
7808 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7809 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
7810 orig_type_left, orig_type_right);
7815 * Check the semantics of comparison expressions.
7817 * @param expression The expression to check.
7819 static void semantic_comparison(binary_expression_t *expression)
7821 expression_t *left = expression->left;
7822 expression_t *right = expression->right;
7823 type_t *orig_type_left = left->base.type;
7824 type_t *orig_type_right = right->base.type;
7826 type_t *type_left = skip_typeref(orig_type_left);
7827 type_t *type_right = skip_typeref(orig_type_right);
7829 /* TODO non-arithmetic types */
7830 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7831 /* test for signed vs unsigned compares */
7832 if (warning.sign_compare &&
7833 (expression->base.kind != EXPR_BINARY_EQUAL &&
7834 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
7835 (is_type_signed(type_left) != is_type_signed(type_right))) {
7837 /* check if 1 of the operands is a constant, in this case we just
7838 * check wether we can safely represent the resulting constant in
7839 * the type of the other operand. */
7840 expression_t *const_expr = NULL;
7841 expression_t *other_expr = NULL;
7843 if (is_constant_expression(left)) {
7846 } else if (is_constant_expression(right)) {
7851 if (const_expr != NULL) {
7852 type_t *other_type = skip_typeref(other_expr->base.type);
7853 long val = fold_constant(const_expr);
7854 /* TODO: check if val can be represented by other_type */
7858 warningf(&expression->base.source_position,
7859 "comparison between signed and unsigned");
7861 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7862 expression->left = create_implicit_cast(left, arithmetic_type);
7863 expression->right = create_implicit_cast(right, arithmetic_type);
7864 expression->base.type = arithmetic_type;
7865 if (warning.float_equal &&
7866 (expression->base.kind == EXPR_BINARY_EQUAL ||
7867 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
7868 is_type_float(arithmetic_type)) {
7869 warningf(&expression->base.source_position,
7870 "comparing floating point with == or != is unsafe");
7872 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7873 /* TODO check compatibility */
7874 } else if (is_type_pointer(type_left)) {
7875 expression->right = create_implicit_cast(right, type_left);
7876 } else if (is_type_pointer(type_right)) {
7877 expression->left = create_implicit_cast(left, type_right);
7878 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7879 type_error_incompatible("invalid operands in comparison",
7880 &expression->base.source_position,
7881 type_left, type_right);
7883 expression->base.type = type_int;
7887 * Checks if a compound type has constant fields.
7889 static bool has_const_fields(const compound_type_t *type)
7891 const scope_t *scope = &type->declaration->scope;
7892 const declaration_t *declaration = scope->declarations;
7894 for (; declaration != NULL; declaration = declaration->next) {
7895 if (declaration->namespc != NAMESPACE_NORMAL)
7898 const type_t *decl_type = skip_typeref(declaration->type);
7899 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
7906 static bool is_valid_assignment_lhs(expression_t const* const left)
7908 type_t *const orig_type_left = revert_automatic_type_conversion(left);
7909 type_t *const type_left = skip_typeref(orig_type_left);
7911 if (!is_lvalue(left)) {
7912 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
7917 if (is_type_array(type_left)) {
7918 errorf(HERE, "cannot assign to arrays ('%E')", left);
7921 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
7922 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
7926 if (is_type_incomplete(type_left)) {
7927 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
7928 left, orig_type_left);
7931 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
7932 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
7933 left, orig_type_left);
7940 static void semantic_arithmetic_assign(binary_expression_t *expression)
7942 expression_t *left = expression->left;
7943 expression_t *right = expression->right;
7944 type_t *orig_type_left = left->base.type;
7945 type_t *orig_type_right = right->base.type;
7947 if (!is_valid_assignment_lhs(left))
7950 type_t *type_left = skip_typeref(orig_type_left);
7951 type_t *type_right = skip_typeref(orig_type_right);
7953 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7954 /* TODO: improve error message */
7955 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7956 errorf(&expression->base.source_position,
7957 "operation needs arithmetic types");
7962 /* combined instructions are tricky. We can't create an implicit cast on
7963 * the left side, because we need the uncasted form for the store.
7964 * The ast2firm pass has to know that left_type must be right_type
7965 * for the arithmetic operation and create a cast by itself */
7966 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7967 expression->right = create_implicit_cast(right, arithmetic_type);
7968 expression->base.type = type_left;
7971 static void semantic_divmod_assign(binary_expression_t *expression)
7973 semantic_arithmetic_assign(expression);
7974 warn_div_by_zero(expression);
7977 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
7979 expression_t *const left = expression->left;
7980 expression_t *const right = expression->right;
7981 type_t *const orig_type_left = left->base.type;
7982 type_t *const orig_type_right = right->base.type;
7983 type_t *const type_left = skip_typeref(orig_type_left);
7984 type_t *const type_right = skip_typeref(orig_type_right);
7986 if (!is_valid_assignment_lhs(left))
7989 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7990 /* combined instructions are tricky. We can't create an implicit cast on
7991 * the left side, because we need the uncasted form for the store.
7992 * The ast2firm pass has to know that left_type must be right_type
7993 * for the arithmetic operation and create a cast by itself */
7994 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
7995 expression->right = create_implicit_cast(right, arithmetic_type);
7996 expression->base.type = type_left;
7997 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7998 check_pointer_arithmetic(&expression->base.source_position,
7999 type_left, orig_type_left);
8000 expression->base.type = type_left;
8001 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8002 errorf(&expression->base.source_position,
8003 "incompatible types '%T' and '%T' in assignment",
8004 orig_type_left, orig_type_right);
8009 * Check the semantic restrictions of a logical expression.
8011 static void semantic_logical_op(binary_expression_t *expression)
8013 expression_t *const left = expression->left;
8014 expression_t *const right = expression->right;
8015 type_t *const orig_type_left = left->base.type;
8016 type_t *const orig_type_right = right->base.type;
8017 type_t *const type_left = skip_typeref(orig_type_left);
8018 type_t *const type_right = skip_typeref(orig_type_right);
8020 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
8021 /* TODO: improve error message */
8022 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8023 errorf(&expression->base.source_position,
8024 "operation needs scalar types");
8029 expression->base.type = type_int;
8033 * Check the semantic restrictions of a binary assign expression.
8035 static void semantic_binexpr_assign(binary_expression_t *expression)
8037 expression_t *left = expression->left;
8038 type_t *orig_type_left = left->base.type;
8040 if (!is_valid_assignment_lhs(left))
8043 assign_error_t error = semantic_assign(orig_type_left, expression->right);
8044 report_assign_error(error, orig_type_left, expression->right,
8045 "assignment", &left->base.source_position);
8046 expression->right = create_implicit_cast(expression->right, orig_type_left);
8047 expression->base.type = orig_type_left;
8051 * Determine if the outermost operation (or parts thereof) of the given
8052 * expression has no effect in order to generate a warning about this fact.
8053 * Therefore in some cases this only examines some of the operands of the
8054 * expression (see comments in the function and examples below).
8056 * f() + 23; // warning, because + has no effect
8057 * x || f(); // no warning, because x controls execution of f()
8058 * x ? y : f(); // warning, because y has no effect
8059 * (void)x; // no warning to be able to suppress the warning
8060 * This function can NOT be used for an "expression has definitely no effect"-
8062 static bool expression_has_effect(const expression_t *const expr)
8064 switch (expr->kind) {
8065 case EXPR_UNKNOWN: break;
8066 case EXPR_INVALID: return true; /* do NOT warn */
8067 case EXPR_REFERENCE: return false;
8068 /* suppress the warning for microsoft __noop operations */
8069 case EXPR_CONST: return expr->conste.is_ms_noop;
8070 case EXPR_CHARACTER_CONSTANT: return false;
8071 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
8072 case EXPR_STRING_LITERAL: return false;
8073 case EXPR_WIDE_STRING_LITERAL: return false;
8074 case EXPR_LABEL_ADDRESS: return false;
8077 const call_expression_t *const call = &expr->call;
8078 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
8081 switch (call->function->builtin_symbol.symbol->ID) {
8082 case T___builtin_va_end: return true;
8083 default: return false;
8087 /* Generate the warning if either the left or right hand side of a
8088 * conditional expression has no effect */
8089 case EXPR_CONDITIONAL: {
8090 const conditional_expression_t *const cond = &expr->conditional;
8092 expression_has_effect(cond->true_expression) &&
8093 expression_has_effect(cond->false_expression);
8096 case EXPR_SELECT: return false;
8097 case EXPR_ARRAY_ACCESS: return false;
8098 case EXPR_SIZEOF: return false;
8099 case EXPR_CLASSIFY_TYPE: return false;
8100 case EXPR_ALIGNOF: return false;
8102 case EXPR_FUNCNAME: return false;
8103 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
8104 case EXPR_BUILTIN_CONSTANT_P: return false;
8105 case EXPR_BUILTIN_PREFETCH: return true;
8106 case EXPR_OFFSETOF: return false;
8107 case EXPR_VA_START: return true;
8108 case EXPR_VA_ARG: return true;
8109 case EXPR_STATEMENT: return true; // TODO
8110 case EXPR_COMPOUND_LITERAL: return false;
8112 case EXPR_UNARY_NEGATE: return false;
8113 case EXPR_UNARY_PLUS: return false;
8114 case EXPR_UNARY_BITWISE_NEGATE: return false;
8115 case EXPR_UNARY_NOT: return false;
8116 case EXPR_UNARY_DEREFERENCE: return false;
8117 case EXPR_UNARY_TAKE_ADDRESS: return false;
8118 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
8119 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
8120 case EXPR_UNARY_PREFIX_INCREMENT: return true;
8121 case EXPR_UNARY_PREFIX_DECREMENT: return true;
8123 /* Treat void casts as if they have an effect in order to being able to
8124 * suppress the warning */
8125 case EXPR_UNARY_CAST: {
8126 type_t *const type = skip_typeref(expr->base.type);
8127 return is_type_atomic(type, ATOMIC_TYPE_VOID);
8130 case EXPR_UNARY_CAST_IMPLICIT: return true;
8131 case EXPR_UNARY_ASSUME: return true;
8133 case EXPR_BINARY_ADD: return false;
8134 case EXPR_BINARY_SUB: return false;
8135 case EXPR_BINARY_MUL: return false;
8136 case EXPR_BINARY_DIV: return false;
8137 case EXPR_BINARY_MOD: return false;
8138 case EXPR_BINARY_EQUAL: return false;
8139 case EXPR_BINARY_NOTEQUAL: return false;
8140 case EXPR_BINARY_LESS: return false;
8141 case EXPR_BINARY_LESSEQUAL: return false;
8142 case EXPR_BINARY_GREATER: return false;
8143 case EXPR_BINARY_GREATEREQUAL: return false;
8144 case EXPR_BINARY_BITWISE_AND: return false;
8145 case EXPR_BINARY_BITWISE_OR: return false;
8146 case EXPR_BINARY_BITWISE_XOR: return false;
8147 case EXPR_BINARY_SHIFTLEFT: return false;
8148 case EXPR_BINARY_SHIFTRIGHT: return false;
8149 case EXPR_BINARY_ASSIGN: return true;
8150 case EXPR_BINARY_MUL_ASSIGN: return true;
8151 case EXPR_BINARY_DIV_ASSIGN: return true;
8152 case EXPR_BINARY_MOD_ASSIGN: return true;
8153 case EXPR_BINARY_ADD_ASSIGN: return true;
8154 case EXPR_BINARY_SUB_ASSIGN: return true;
8155 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
8156 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
8157 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8158 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8159 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
8161 /* Only examine the right hand side of && and ||, because the left hand
8162 * side already has the effect of controlling the execution of the right
8164 case EXPR_BINARY_LOGICAL_AND:
8165 case EXPR_BINARY_LOGICAL_OR:
8166 /* Only examine the right hand side of a comma expression, because the left
8167 * hand side has a separate warning */
8168 case EXPR_BINARY_COMMA:
8169 return expression_has_effect(expr->binary.right);
8171 case EXPR_BINARY_BUILTIN_EXPECT: return true;
8172 case EXPR_BINARY_ISGREATER: return false;
8173 case EXPR_BINARY_ISGREATEREQUAL: return false;
8174 case EXPR_BINARY_ISLESS: return false;
8175 case EXPR_BINARY_ISLESSEQUAL: return false;
8176 case EXPR_BINARY_ISLESSGREATER: return false;
8177 case EXPR_BINARY_ISUNORDERED: return false;
8180 internal_errorf(HERE, "unexpected expression");
8183 static void semantic_comma(binary_expression_t *expression)
8185 if (warning.unused_value) {
8186 const expression_t *const left = expression->left;
8187 if (!expression_has_effect(left)) {
8188 warningf(&left->base.source_position,
8189 "left-hand operand of comma expression has no effect");
8192 expression->base.type = expression->right->base.type;
8195 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
8196 static expression_t *parse_##binexpression_type(unsigned precedence, \
8197 expression_t *left) \
8199 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8200 binexpr->base.source_position = *HERE; \
8201 binexpr->binary.left = left; \
8204 expression_t *right = parse_sub_expression(precedence + lr); \
8206 binexpr->binary.right = right; \
8207 sfunc(&binexpr->binary); \
8212 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
8213 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
8214 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_divmod_arithmetic, 1)
8215 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_divmod_arithmetic, 1)
8216 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
8217 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
8218 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
8219 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
8220 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
8222 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
8223 semantic_comparison, 1)
8224 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
8225 semantic_comparison, 1)
8226 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
8227 semantic_comparison, 1)
8228 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
8229 semantic_comparison, 1)
8231 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
8232 semantic_binexpr_arithmetic, 1)
8233 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
8234 semantic_binexpr_arithmetic, 1)
8235 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
8236 semantic_binexpr_arithmetic, 1)
8237 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
8238 semantic_logical_op, 1)
8239 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
8240 semantic_logical_op, 1)
8241 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
8242 semantic_shift_op, 1)
8243 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
8244 semantic_shift_op, 1)
8245 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
8246 semantic_arithmetic_addsubb_assign, 0)
8247 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
8248 semantic_arithmetic_addsubb_assign, 0)
8249 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
8250 semantic_arithmetic_assign, 0)
8251 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
8252 semantic_divmod_assign, 0)
8253 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
8254 semantic_divmod_assign, 0)
8255 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
8256 semantic_arithmetic_assign, 0)
8257 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8258 semantic_arithmetic_assign, 0)
8259 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
8260 semantic_arithmetic_assign, 0)
8261 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
8262 semantic_arithmetic_assign, 0)
8263 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
8264 semantic_arithmetic_assign, 0)
8266 static expression_t *parse_sub_expression(unsigned precedence)
8268 if (token.type < 0) {
8269 return expected_expression_error();
8272 expression_parser_function_t *parser
8273 = &expression_parsers[token.type];
8274 source_position_t source_position = token.source_position;
8277 if (parser->parser != NULL) {
8278 left = parser->parser(parser->precedence);
8280 left = parse_primary_expression();
8282 assert(left != NULL);
8283 left->base.source_position = source_position;
8286 if (token.type < 0) {
8287 return expected_expression_error();
8290 parser = &expression_parsers[token.type];
8291 if (parser->infix_parser == NULL)
8293 if (parser->infix_precedence < precedence)
8296 left = parser->infix_parser(parser->infix_precedence, left);
8298 assert(left != NULL);
8299 assert(left->kind != EXPR_UNKNOWN);
8300 left->base.source_position = source_position;
8307 * Parse an expression.
8309 static expression_t *parse_expression(void)
8311 return parse_sub_expression(1);
8315 * Register a parser for a prefix-like operator with given precedence.
8317 * @param parser the parser function
8318 * @param token_type the token type of the prefix token
8319 * @param precedence the precedence of the operator
8321 static void register_expression_parser(parse_expression_function parser,
8322 int token_type, unsigned precedence)
8324 expression_parser_function_t *entry = &expression_parsers[token_type];
8326 if (entry->parser != NULL) {
8327 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8328 panic("trying to register multiple expression parsers for a token");
8330 entry->parser = parser;
8331 entry->precedence = precedence;
8335 * Register a parser for an infix operator with given precedence.
8337 * @param parser the parser function
8338 * @param token_type the token type of the infix operator
8339 * @param precedence the precedence of the operator
8341 static void register_infix_parser(parse_expression_infix_function parser,
8342 int token_type, unsigned precedence)
8344 expression_parser_function_t *entry = &expression_parsers[token_type];
8346 if (entry->infix_parser != NULL) {
8347 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8348 panic("trying to register multiple infix expression parsers for a "
8351 entry->infix_parser = parser;
8352 entry->infix_precedence = precedence;
8356 * Initialize the expression parsers.
8358 static void init_expression_parsers(void)
8360 memset(&expression_parsers, 0, sizeof(expression_parsers));
8362 register_infix_parser(parse_array_expression, '[', 30);
8363 register_infix_parser(parse_call_expression, '(', 30);
8364 register_infix_parser(parse_select_expression, '.', 30);
8365 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
8366 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
8368 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
8371 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
8372 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
8373 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
8374 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
8375 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
8376 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
8377 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
8378 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
8379 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
8380 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
8381 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
8382 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
8383 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
8384 T_EXCLAMATIONMARKEQUAL, 13);
8385 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
8386 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
8387 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
8388 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
8389 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
8390 register_infix_parser(parse_conditional_expression, '?', 7);
8391 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
8392 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
8393 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
8394 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
8395 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
8396 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
8397 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
8398 T_LESSLESSEQUAL, 2);
8399 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8400 T_GREATERGREATEREQUAL, 2);
8401 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
8403 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
8405 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
8408 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
8410 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
8411 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
8412 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
8413 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
8414 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
8415 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
8416 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
8418 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
8420 register_expression_parser(parse_sizeof, T_sizeof, 25);
8421 register_expression_parser(parse_alignof, T___alignof__, 25);
8422 register_expression_parser(parse_extension, T___extension__, 25);
8423 register_expression_parser(parse_builtin_classify_type,
8424 T___builtin_classify_type, 25);
8428 * Parse a asm statement arguments specification.
8430 static asm_argument_t *parse_asm_arguments(bool is_out)
8432 asm_argument_t *result = NULL;
8433 asm_argument_t *last = NULL;
8435 while (token.type == T_STRING_LITERAL || token.type == '[') {
8436 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8437 memset(argument, 0, sizeof(argument[0]));
8439 if (token.type == '[') {
8441 if (token.type != T_IDENTIFIER) {
8442 parse_error_expected("while parsing asm argument",
8443 T_IDENTIFIER, NULL);
8446 argument->symbol = token.v.symbol;
8451 argument->constraints = parse_string_literals();
8453 add_anchor_token(')');
8454 expression_t *expression = parse_expression();
8455 rem_anchor_token(')');
8457 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
8458 * change size or type representation (e.g. int -> long is ok, but
8459 * int -> float is not) */
8460 if (expression->kind == EXPR_UNARY_CAST) {
8461 type_t *const type = expression->base.type;
8462 type_kind_t const kind = type->kind;
8463 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8466 if (kind == TYPE_ATOMIC) {
8467 atomic_type_kind_t const akind = type->atomic.akind;
8468 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8469 size = get_atomic_type_size(akind);
8471 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8472 size = get_atomic_type_size(get_intptr_kind());
8476 expression_t *const value = expression->unary.value;
8477 type_t *const value_type = value->base.type;
8478 type_kind_t const value_kind = value_type->kind;
8480 unsigned value_flags;
8481 unsigned value_size;
8482 if (value_kind == TYPE_ATOMIC) {
8483 atomic_type_kind_t const value_akind = value_type->atomic.akind;
8484 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8485 value_size = get_atomic_type_size(value_akind);
8486 } else if (value_kind == TYPE_POINTER) {
8487 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8488 value_size = get_atomic_type_size(get_intptr_kind());
8493 if (value_flags != flags || value_size != size)
8497 } while (expression->kind == EXPR_UNARY_CAST);
8501 if (!is_lvalue(expression)) {
8502 errorf(&expression->base.source_position,
8503 "asm output argument is not an lvalue");
8506 argument->expression = expression;
8509 set_address_taken(expression, true);
8512 last->next = argument;
8518 if (token.type != ',')
8529 * Parse a asm statement clobber specification.
8531 static asm_clobber_t *parse_asm_clobbers(void)
8533 asm_clobber_t *result = NULL;
8534 asm_clobber_t *last = NULL;
8536 while(token.type == T_STRING_LITERAL) {
8537 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
8538 clobber->clobber = parse_string_literals();
8541 last->next = clobber;
8547 if (token.type != ',')
8556 * Parse an asm statement.
8558 static statement_t *parse_asm_statement(void)
8562 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8563 statement->base.source_position = token.source_position;
8565 asm_statement_t *asm_statement = &statement->asms;
8567 if (token.type == T_volatile) {
8569 asm_statement->is_volatile = true;
8573 add_anchor_token(')');
8574 add_anchor_token(':');
8575 asm_statement->asm_text = parse_string_literals();
8577 if (token.type != ':') {
8578 rem_anchor_token(':');
8583 asm_statement->outputs = parse_asm_arguments(true);
8584 if (token.type != ':') {
8585 rem_anchor_token(':');
8590 asm_statement->inputs = parse_asm_arguments(false);
8591 if (token.type != ':') {
8592 rem_anchor_token(':');
8595 rem_anchor_token(':');
8598 asm_statement->clobbers = parse_asm_clobbers();
8601 rem_anchor_token(')');
8605 if (asm_statement->outputs == NULL) {
8606 /* GCC: An 'asm' instruction without any output operands will be treated
8607 * identically to a volatile 'asm' instruction. */
8608 asm_statement->is_volatile = true;
8613 return create_invalid_statement();
8617 * Parse a case statement.
8619 static statement_t *parse_case_statement(void)
8623 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8624 source_position_t *const pos = &statement->base.source_position;
8626 *pos = token.source_position;
8627 expression_t *const expression = parse_expression();
8628 statement->case_label.expression = expression;
8629 if (!is_constant_expression(expression)) {
8630 /* This check does not prevent the error message in all cases of an
8631 * prior error while parsing the expression. At least it catches the
8632 * common case of a mistyped enum entry. */
8633 if (is_type_valid(expression->base.type)) {
8634 errorf(pos, "case label does not reduce to an integer constant");
8636 statement->case_label.is_bad = true;
8638 long const val = fold_constant(expression);
8639 statement->case_label.first_case = val;
8640 statement->case_label.last_case = val;
8643 if (c_mode & _GNUC) {
8644 if (token.type == T_DOTDOTDOT) {
8646 expression_t *const end_range = parse_expression();
8647 statement->case_label.end_range = end_range;
8648 if (!is_constant_expression(end_range)) {
8649 /* This check does not prevent the error message in all cases of an
8650 * prior error while parsing the expression. At least it catches the
8651 * common case of a mistyped enum entry. */
8652 if (is_type_valid(end_range->base.type)) {
8653 errorf(pos, "case range does not reduce to an integer constant");
8655 statement->case_label.is_bad = true;
8657 long const val = fold_constant(end_range);
8658 statement->case_label.last_case = val;
8660 if (val < statement->case_label.first_case) {
8661 statement->case_label.is_empty = true;
8662 warningf(pos, "empty range specified");
8668 PUSH_PARENT(statement);
8672 if (current_switch != NULL) {
8673 if (! statement->case_label.is_bad) {
8674 /* Check for duplicate case values */
8675 case_label_statement_t *c = &statement->case_label;
8676 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
8677 if (l->is_bad || l->is_empty || l->expression == NULL)
8680 if (c->last_case < l->first_case || c->first_case > l->last_case)
8683 errorf(pos, "duplicate case value (previously used %P)",
8684 &l->base.source_position);
8688 /* link all cases into the switch statement */
8689 if (current_switch->last_case == NULL) {
8690 current_switch->first_case = &statement->case_label;
8692 current_switch->last_case->next = &statement->case_label;
8694 current_switch->last_case = &statement->case_label;
8696 errorf(pos, "case label not within a switch statement");
8699 statement_t *const inner_stmt = parse_statement();
8700 statement->case_label.statement = inner_stmt;
8701 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8702 errorf(&inner_stmt->base.source_position, "declaration after case label");
8709 return create_invalid_statement();
8713 * Parse a default statement.
8715 static statement_t *parse_default_statement(void)
8719 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8720 statement->base.source_position = token.source_position;
8722 PUSH_PARENT(statement);
8725 if (current_switch != NULL) {
8726 const case_label_statement_t *def_label = current_switch->default_label;
8727 if (def_label != NULL) {
8728 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
8729 &def_label->base.source_position);
8731 current_switch->default_label = &statement->case_label;
8733 /* link all cases into the switch statement */
8734 if (current_switch->last_case == NULL) {
8735 current_switch->first_case = &statement->case_label;
8737 current_switch->last_case->next = &statement->case_label;
8739 current_switch->last_case = &statement->case_label;
8742 errorf(&statement->base.source_position,
8743 "'default' label not within a switch statement");
8746 statement_t *const inner_stmt = parse_statement();
8747 statement->case_label.statement = inner_stmt;
8748 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8749 errorf(&inner_stmt->base.source_position, "declaration after default label");
8756 return create_invalid_statement();
8760 * Parse a label statement.
8762 static statement_t *parse_label_statement(void)
8764 assert(token.type == T_IDENTIFIER);
8765 symbol_t *symbol = token.v.symbol;
8768 declaration_t *label = get_label(symbol);
8770 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
8771 statement->base.source_position = token.source_position;
8772 statement->label.label = label;
8774 PUSH_PARENT(statement);
8776 /* if statement is already set then the label is defined twice,
8777 * otherwise it was just mentioned in a goto/local label declaration so far */
8778 if (label->init.statement != NULL) {
8779 errorf(HERE, "duplicate label '%Y' (declared %P)",
8780 symbol, &label->source_position);
8782 label->source_position = token.source_position;
8783 label->init.statement = statement;
8788 if (token.type == '}') {
8789 /* TODO only warn? */
8791 warningf(HERE, "label at end of compound statement");
8792 statement->label.statement = create_empty_statement();
8794 errorf(HERE, "label at end of compound statement");
8795 statement->label.statement = create_invalid_statement();
8797 } else if (token.type == ';') {
8798 /* Eat an empty statement here, to avoid the warning about an empty
8799 * statement after a label. label:; is commonly used to have a label
8800 * before a closing brace. */
8801 statement->label.statement = create_empty_statement();
8804 statement_t *const inner_stmt = parse_statement();
8805 statement->label.statement = inner_stmt;
8806 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8807 errorf(&inner_stmt->base.source_position, "declaration after label");
8811 /* remember the labels in a list for later checking */
8812 if (label_last == NULL) {
8813 label_first = &statement->label;
8815 label_last->next = &statement->label;
8817 label_last = &statement->label;
8824 * Parse an if statement.
8826 static statement_t *parse_if(void)
8830 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
8831 statement->base.source_position = token.source_position;
8833 PUSH_PARENT(statement);
8836 add_anchor_token(')');
8837 statement->ifs.condition = parse_expression();
8838 rem_anchor_token(')');
8841 add_anchor_token(T_else);
8842 statement->ifs.true_statement = parse_statement();
8843 rem_anchor_token(T_else);
8845 if (token.type == T_else) {
8847 statement->ifs.false_statement = parse_statement();
8854 return create_invalid_statement();
8858 * Check that all enums are handled in a switch.
8860 * @param statement the switch statement to check
8862 static void check_enum_cases(const switch_statement_t *statement) {
8863 const type_t *type = skip_typeref(statement->expression->base.type);
8864 if (! is_type_enum(type))
8866 const enum_type_t *enumt = &type->enumt;
8868 /* if we have a default, no warnings */
8869 if (statement->default_label != NULL)
8872 /* FIXME: calculation of value should be done while parsing */
8873 const declaration_t *declaration;
8874 long last_value = -1;
8875 for (declaration = enumt->declaration->next;
8876 declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY;
8877 declaration = declaration->next) {
8878 const expression_t *expression = declaration->init.enum_value;
8879 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
8881 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
8882 if (l->expression == NULL)
8884 if (l->first_case <= value && value <= l->last_case) {
8890 warningf(&statement->base.source_position,
8891 "enumeration value '%Y' not handled in switch", declaration->symbol);
8898 * Parse a switch statement.
8900 static statement_t *parse_switch(void)
8904 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
8905 statement->base.source_position = token.source_position;
8907 PUSH_PARENT(statement);
8910 add_anchor_token(')');
8911 expression_t *const expr = parse_expression();
8912 type_t * type = skip_typeref(expr->base.type);
8913 if (is_type_integer(type)) {
8914 type = promote_integer(type);
8915 if (warning.traditional) {
8916 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
8917 warningf(&expr->base.source_position,
8918 "'%T' switch expression not converted to '%T' in ISO C",
8922 } else if (is_type_valid(type)) {
8923 errorf(&expr->base.source_position,
8924 "switch quantity is not an integer, but '%T'", type);
8925 type = type_error_type;
8927 statement->switchs.expression = create_implicit_cast(expr, type);
8929 rem_anchor_token(')');
8931 switch_statement_t *rem = current_switch;
8932 current_switch = &statement->switchs;
8933 statement->switchs.body = parse_statement();
8934 current_switch = rem;
8936 if (warning.switch_default &&
8937 statement->switchs.default_label == NULL) {
8938 warningf(&statement->base.source_position, "switch has no default case");
8940 if (warning.switch_enum)
8941 check_enum_cases(&statement->switchs);
8947 return create_invalid_statement();
8950 static statement_t *parse_loop_body(statement_t *const loop)
8952 statement_t *const rem = current_loop;
8953 current_loop = loop;
8955 statement_t *const body = parse_statement();
8962 * Parse a while statement.
8964 static statement_t *parse_while(void)
8968 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
8969 statement->base.source_position = token.source_position;
8971 PUSH_PARENT(statement);
8974 add_anchor_token(')');
8975 statement->whiles.condition = parse_expression();
8976 rem_anchor_token(')');
8979 statement->whiles.body = parse_loop_body(statement);
8985 return create_invalid_statement();
8989 * Parse a do statement.
8991 static statement_t *parse_do(void)
8995 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
8996 statement->base.source_position = token.source_position;
8998 PUSH_PARENT(statement)
9000 add_anchor_token(T_while);
9001 statement->do_while.body = parse_loop_body(statement);
9002 rem_anchor_token(T_while);
9006 add_anchor_token(')');
9007 statement->do_while.condition = parse_expression();
9008 rem_anchor_token(')');
9016 return create_invalid_statement();
9020 * Parse a for statement.
9022 static statement_t *parse_for(void)
9026 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9027 statement->base.source_position = token.source_position;
9029 PUSH_PARENT(statement);
9031 int top = environment_top();
9032 scope_t *last_scope = scope;
9033 set_scope(&statement->fors.scope);
9036 add_anchor_token(')');
9038 if (token.type != ';') {
9039 if (is_declaration_specifier(&token, false)) {
9040 parse_declaration(record_declaration);
9042 add_anchor_token(';');
9043 expression_t *const init = parse_expression();
9044 statement->fors.initialisation = init;
9045 if (warning.unused_value && !expression_has_effect(init)) {
9046 warningf(&init->base.source_position,
9047 "initialisation of 'for'-statement has no effect");
9049 rem_anchor_token(';');
9056 if (token.type != ';') {
9057 add_anchor_token(';');
9058 statement->fors.condition = parse_expression();
9059 rem_anchor_token(';');
9062 if (token.type != ')') {
9063 expression_t *const step = parse_expression();
9064 statement->fors.step = step;
9065 if (warning.unused_value && !expression_has_effect(step)) {
9066 warningf(&step->base.source_position,
9067 "step of 'for'-statement has no effect");
9070 rem_anchor_token(')');
9072 statement->fors.body = parse_loop_body(statement);
9074 assert(scope == &statement->fors.scope);
9075 set_scope(last_scope);
9076 environment_pop_to(top);
9083 rem_anchor_token(')');
9084 assert(scope == &statement->fors.scope);
9085 set_scope(last_scope);
9086 environment_pop_to(top);
9088 return create_invalid_statement();
9092 * Parse a goto statement.
9094 static statement_t *parse_goto(void)
9096 source_position_t source_position = token.source_position;
9099 statement_t *statement;
9100 if (c_mode & _GNUC && token.type == '*') {
9102 expression_t *expression = parse_expression();
9104 /* Argh: although documentation say the expression must be of type void *,
9105 * gcc excepts anything that can be casted into void * without error */
9106 type_t *type = expression->base.type;
9108 if (type != type_error_type) {
9109 if (!is_type_pointer(type) && !is_type_integer(type)) {
9110 errorf(&source_position, "cannot convert to a pointer type");
9111 } else if (type != type_void_ptr) {
9112 warningf(&source_position,
9113 "type of computed goto expression should be 'void*' not '%T'", type);
9115 expression = create_implicit_cast(expression, type_void_ptr);
9118 statement = allocate_statement_zero(STATEMENT_GOTO);
9119 statement->base.source_position = source_position;
9120 statement->gotos.expression = expression;
9122 if (token.type != T_IDENTIFIER) {
9124 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9126 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9130 symbol_t *symbol = token.v.symbol;
9133 statement = allocate_statement_zero(STATEMENT_GOTO);
9134 statement->base.source_position = source_position;
9135 statement->gotos.label = get_label(symbol);
9138 /* remember the goto's in a list for later checking */
9139 if (goto_last == NULL) {
9140 goto_first = &statement->gotos;
9142 goto_last->next = &statement->gotos;
9144 goto_last = &statement->gotos;
9150 return create_invalid_statement();
9154 * Parse a continue statement.
9156 static statement_t *parse_continue(void)
9158 if (current_loop == NULL) {
9159 errorf(HERE, "continue statement not within loop");
9162 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9163 statement->base.source_position = token.source_position;
9173 * Parse a break statement.
9175 static statement_t *parse_break(void)
9177 if (current_switch == NULL && current_loop == NULL) {
9178 errorf(HERE, "break statement not within loop or switch");
9181 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9182 statement->base.source_position = token.source_position;
9192 * Parse a __leave statement.
9194 static statement_t *parse_leave_statement(void)
9196 if (current_try == NULL) {
9197 errorf(HERE, "__leave statement not within __try");
9200 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9201 statement->base.source_position = token.source_position;
9211 * Check if a given declaration represents a local variable.
9213 static bool is_local_var_declaration(const declaration_t *declaration)
9215 switch ((storage_class_tag_t) declaration->storage_class) {
9216 case STORAGE_CLASS_AUTO:
9217 case STORAGE_CLASS_REGISTER: {
9218 const type_t *type = skip_typeref(declaration->type);
9219 if (is_type_function(type)) {
9231 * Check if a given declaration represents a variable.
9233 static bool is_var_declaration(const declaration_t *declaration)
9235 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
9238 const type_t *type = skip_typeref(declaration->type);
9239 return !is_type_function(type);
9243 * Check if a given expression represents a local variable.
9245 static bool is_local_variable(const expression_t *expression)
9247 if (expression->base.kind != EXPR_REFERENCE) {
9250 const declaration_t *declaration = expression->reference.declaration;
9251 return is_local_var_declaration(declaration);
9255 * Check if a given expression represents a local variable and
9256 * return its declaration then, else return NULL.
9258 declaration_t *expr_is_variable(const expression_t *expression)
9260 if (expression->base.kind != EXPR_REFERENCE) {
9263 declaration_t *declaration = expression->reference.declaration;
9264 if (is_var_declaration(declaration))
9270 * Parse a return statement.
9272 static statement_t *parse_return(void)
9274 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9275 statement->base.source_position = token.source_position;
9279 expression_t *return_value = NULL;
9280 if (token.type != ';') {
9281 return_value = parse_expression();
9284 const type_t *const func_type = current_function->type;
9285 assert(is_type_function(func_type));
9286 type_t *const return_type = skip_typeref(func_type->function.return_type);
9288 if (return_value != NULL) {
9289 type_t *return_value_type = skip_typeref(return_value->base.type);
9291 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
9292 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9293 warningf(&statement->base.source_position,
9294 "'return' with a value, in function returning void");
9295 return_value = NULL;
9297 assign_error_t error = semantic_assign(return_type, return_value);
9298 report_assign_error(error, return_type, return_value, "'return'",
9299 &statement->base.source_position);
9300 return_value = create_implicit_cast(return_value, return_type);
9302 /* check for returning address of a local var */
9303 if (return_value != NULL &&
9304 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9305 const expression_t *expression = return_value->unary.value;
9306 if (is_local_variable(expression)) {
9307 warningf(&statement->base.source_position,
9308 "function returns address of local variable");
9312 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9313 warningf(&statement->base.source_position,
9314 "'return' without value, in function returning non-void");
9317 statement->returns.value = return_value;
9326 * Parse a declaration statement.
9328 static statement_t *parse_declaration_statement(void)
9330 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9332 statement->base.source_position = token.source_position;
9334 declaration_t *before = last_declaration;
9335 parse_declaration(record_declaration);
9337 if (before == NULL) {
9338 statement->declaration.declarations_begin = scope->declarations;
9340 statement->declaration.declarations_begin = before->next;
9342 statement->declaration.declarations_end = last_declaration;
9348 * Parse an expression statement, ie. expr ';'.
9350 static statement_t *parse_expression_statement(void)
9352 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9354 statement->base.source_position = token.source_position;
9355 expression_t *const expr = parse_expression();
9356 statement->expression.expression = expr;
9365 * Parse a microsoft __try { } __finally { } or
9366 * __try{ } __except() { }
9368 static statement_t *parse_ms_try_statment(void)
9370 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9371 statement->base.source_position = token.source_position;
9374 PUSH_PARENT(statement);
9376 ms_try_statement_t *rem = current_try;
9377 current_try = &statement->ms_try;
9378 statement->ms_try.try_statement = parse_compound_statement(false);
9383 if (token.type == T___except) {
9386 add_anchor_token(')');
9387 expression_t *const expr = parse_expression();
9388 type_t * type = skip_typeref(expr->base.type);
9389 if (is_type_integer(type)) {
9390 type = promote_integer(type);
9391 } else if (is_type_valid(type)) {
9392 errorf(&expr->base.source_position,
9393 "__expect expression is not an integer, but '%T'", type);
9394 type = type_error_type;
9396 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9397 rem_anchor_token(')');
9399 statement->ms_try.final_statement = parse_compound_statement(false);
9400 } else if (token.type == T__finally) {
9402 statement->ms_try.final_statement = parse_compound_statement(false);
9404 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9405 return create_invalid_statement();
9409 return create_invalid_statement();
9412 static statement_t *parse_empty_statement(void)
9414 if (warning.empty_statement) {
9415 warningf(HERE, "statement is empty");
9417 statement_t *const statement = create_empty_statement();
9422 static statement_t *parse_local_label_declaration(void) {
9423 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9424 statement->base.source_position = token.source_position;
9428 declaration_t *begin = NULL, *end = NULL;
9431 if (token.type != T_IDENTIFIER) {
9432 parse_error_expected("while parsing local label declaration",
9433 T_IDENTIFIER, NULL);
9436 symbol_t *symbol = token.v.symbol;
9437 declaration_t *declaration = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
9438 if (declaration != NULL) {
9439 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition at %P)",
9440 symbol, &declaration->source_position);
9442 declaration = allocate_declaration_zero();
9443 declaration->namespc = NAMESPACE_LOCAL_LABEL;
9444 declaration->source_position = token.source_position;
9445 declaration->symbol = symbol;
9446 declaration->parent_scope = scope;
9447 declaration->init.statement = NULL;
9450 end->next = declaration;
9453 begin = declaration;
9455 local_label_push(declaration);
9459 if (token.type != ',')
9465 statement->declaration.declarations_begin = begin;
9466 statement->declaration.declarations_end = end;
9471 * Parse a statement.
9472 * There's also parse_statement() which additionally checks for
9473 * "statement has no effect" warnings
9475 static statement_t *intern_parse_statement(void)
9477 statement_t *statement = NULL;
9479 /* declaration or statement */
9480 add_anchor_token(';');
9481 switch (token.type) {
9482 case T_IDENTIFIER: {
9483 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9484 if (la1_type == ':') {
9485 statement = parse_label_statement();
9486 } else if (is_typedef_symbol(token.v.symbol)) {
9487 statement = parse_declaration_statement();
9488 } else switch (la1_type) {
9492 statement = parse_declaration_statement();
9496 statement = parse_expression_statement();
9502 case T___extension__:
9503 /* This can be a prefix to a declaration or an expression statement.
9504 * We simply eat it now and parse the rest with tail recursion. */
9507 } while (token.type == T___extension__);
9508 statement = parse_statement();
9512 statement = parse_declaration_statement();
9516 statement = parse_local_label_declaration();
9519 case ';': statement = parse_empty_statement(); break;
9520 case '{': statement = parse_compound_statement(false); break;
9521 case T___leave: statement = parse_leave_statement(); break;
9522 case T___try: statement = parse_ms_try_statment(); break;
9523 case T_asm: statement = parse_asm_statement(); break;
9524 case T_break: statement = parse_break(); break;
9525 case T_case: statement = parse_case_statement(); break;
9526 case T_continue: statement = parse_continue(); break;
9527 case T_default: statement = parse_default_statement(); break;
9528 case T_do: statement = parse_do(); break;
9529 case T_for: statement = parse_for(); break;
9530 case T_goto: statement = parse_goto(); break;
9531 case T_if: statement = parse_if (); break;
9532 case T_return: statement = parse_return(); break;
9533 case T_switch: statement = parse_switch(); break;
9534 case T_while: statement = parse_while(); break;
9535 default: statement = parse_expression_statement(); break;
9537 rem_anchor_token(';');
9539 assert(statement != NULL
9540 && statement->base.source_position.input_name != NULL);
9546 * parse a statement and emits "statement has no effect" warning if needed
9547 * (This is really a wrapper around intern_parse_statement with check for 1
9548 * single warning. It is needed, because for statement expressions we have
9549 * to avoid the warning on the last statement)
9551 static statement_t *parse_statement(void)
9553 statement_t *statement = intern_parse_statement();
9555 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
9556 expression_t *expression = statement->expression.expression;
9557 if (!expression_has_effect(expression)) {
9558 warningf(&expression->base.source_position,
9559 "statement has no effect");
9567 * Parse a compound statement.
9569 static statement_t *parse_compound_statement(bool inside_expression_statement)
9571 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
9572 statement->base.source_position = token.source_position;
9574 PUSH_PARENT(statement);
9577 add_anchor_token('}');
9579 int top = environment_top();
9580 int top_local = local_label_top();
9581 scope_t *last_scope = scope;
9582 set_scope(&statement->compound.scope);
9584 statement_t **anchor = &statement->compound.statements;
9585 bool only_decls_so_far = true;
9586 while (token.type != '}' && token.type != T_EOF) {
9587 statement_t *sub_statement = intern_parse_statement();
9588 if (is_invalid_statement(sub_statement)) {
9589 /* an error occurred. if we are at an anchor, return */
9595 if (warning.declaration_after_statement) {
9596 if (sub_statement->kind != STATEMENT_DECLARATION) {
9597 only_decls_so_far = false;
9598 } else if (!only_decls_so_far) {
9599 warningf(&sub_statement->base.source_position,
9600 "ISO C90 forbids mixed declarations and code");
9604 *anchor = sub_statement;
9606 while (sub_statement->base.next != NULL)
9607 sub_statement = sub_statement->base.next;
9609 anchor = &sub_statement->base.next;
9612 if (token.type == '}') {
9615 errorf(&statement->base.source_position,
9616 "end of file while looking for closing '}'");
9619 /* look over all statements again to produce no effect warnings */
9620 if (warning.unused_value) {
9621 statement_t *sub_statement = statement->compound.statements;
9622 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
9623 if (sub_statement->kind != STATEMENT_EXPRESSION)
9625 /* don't emit a warning for the last expression in an expression
9626 * statement as it has always an effect */
9627 if (inside_expression_statement && sub_statement->base.next == NULL)
9630 expression_t *expression = sub_statement->expression.expression;
9631 if (!expression_has_effect(expression)) {
9632 warningf(&expression->base.source_position,
9633 "statement has no effect");
9639 rem_anchor_token('}');
9640 assert(scope == &statement->compound.scope);
9641 set_scope(last_scope);
9642 environment_pop_to(top);
9643 local_label_pop_to(top_local);
9650 * Initialize builtin types.
9652 static void initialize_builtin_types(void)
9654 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
9655 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
9656 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
9657 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
9658 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
9659 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
9660 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", opt_short_wchar_t ? type_unsigned_short : type_int);
9661 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
9663 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
9664 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
9665 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
9666 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
9668 /* const version of wchar_t */
9669 type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
9670 type_const_wchar_t->typedeft.declaration = type_wchar_t->typedeft.declaration;
9671 type_const_wchar_t->base.qualifiers |= TYPE_QUALIFIER_CONST;
9673 type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE);
9677 * Check for unused global static functions and variables
9679 static void check_unused_globals(void)
9681 if (!warning.unused_function && !warning.unused_variable)
9684 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
9686 decl->modifiers & DM_UNUSED ||
9687 decl->modifiers & DM_USED ||
9688 decl->storage_class != STORAGE_CLASS_STATIC)
9691 type_t *const type = decl->type;
9693 if (is_type_function(skip_typeref(type))) {
9694 if (!warning.unused_function || decl->is_inline)
9697 s = (decl->init.statement != NULL ? "defined" : "declared");
9699 if (!warning.unused_variable)
9705 warningf(&decl->source_position, "'%#T' %s but not used",
9706 type, decl->symbol, s);
9710 static void parse_global_asm(void)
9715 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9716 statement->base.source_position = token.source_position;
9717 statement->asms.asm_text = parse_string_literals();
9718 statement->base.next = unit->global_asm;
9719 unit->global_asm = statement;
9728 * Parse a translation unit.
9730 static void parse_translation_unit(void)
9732 for (;;) switch (token.type) {
9735 case T___extension__:
9736 parse_external_declaration();
9747 /* TODO error in strict mode */
9748 warningf(HERE, "stray ';' outside of function");
9753 errorf(HERE, "stray %K outside of function", &token);
9754 if (token.type == '(' || token.type == '{' || token.type == '[')
9755 eat_until_matching_token(token.type);
9764 * @return the translation unit or NULL if errors occurred.
9766 void start_parsing(void)
9768 environment_stack = NEW_ARR_F(stack_entry_t, 0);
9769 label_stack = NEW_ARR_F(stack_entry_t, 0);
9770 local_label_stack = NEW_ARR_F(stack_entry_t, 0);
9771 diagnostic_count = 0;
9775 type_set_output(stderr);
9776 ast_set_output(stderr);
9778 assert(unit == NULL);
9779 unit = allocate_ast_zero(sizeof(unit[0]));
9781 assert(global_scope == NULL);
9782 global_scope = &unit->scope;
9784 assert(scope == NULL);
9785 set_scope(&unit->scope);
9787 initialize_builtin_types();
9790 translation_unit_t *finish_parsing(void)
9792 assert(scope == &unit->scope);
9794 last_declaration = NULL;
9796 assert(global_scope == &unit->scope);
9797 check_unused_globals();
9798 global_scope = NULL;
9800 DEL_ARR_F(environment_stack);
9801 DEL_ARR_F(label_stack);
9802 DEL_ARR_F(local_label_stack);
9804 translation_unit_t *result = unit;
9811 lookahead_bufpos = 0;
9812 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
9815 parse_translation_unit();
9819 * Initialize the parser.
9821 void init_parser(void)
9824 /* add predefined symbols for extended-decl-modifier */
9825 sym_align = symbol_table_insert("align");
9826 sym_allocate = symbol_table_insert("allocate");
9827 sym_dllimport = symbol_table_insert("dllimport");
9828 sym_dllexport = symbol_table_insert("dllexport");
9829 sym_naked = symbol_table_insert("naked");
9830 sym_noinline = symbol_table_insert("noinline");
9831 sym_noreturn = symbol_table_insert("noreturn");
9832 sym_nothrow = symbol_table_insert("nothrow");
9833 sym_novtable = symbol_table_insert("novtable");
9834 sym_property = symbol_table_insert("property");
9835 sym_get = symbol_table_insert("get");
9836 sym_put = symbol_table_insert("put");
9837 sym_selectany = symbol_table_insert("selectany");
9838 sym_thread = symbol_table_insert("thread");
9839 sym_uuid = symbol_table_insert("uuid");
9840 sym_deprecated = symbol_table_insert("deprecated");
9841 sym_restrict = symbol_table_insert("restrict");
9842 sym_noalias = symbol_table_insert("noalias");
9844 memset(token_anchor_set, 0, sizeof(token_anchor_set));
9846 init_expression_parsers();
9847 obstack_init(&temp_obst);
9849 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
9850 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
9854 * Terminate the parser.
9856 void exit_parser(void)
9858 obstack_free(&temp_obst, NULL);