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 /** special symbol used for anonymous entities. */
138 static const symbol_t *sym_anonymous = NULL;
140 /* symbols for Microsoft extended-decl-modifier */
141 static const symbol_t *sym_align = NULL;
142 static const symbol_t *sym_allocate = NULL;
143 static const symbol_t *sym_dllimport = NULL;
144 static const symbol_t *sym_dllexport = NULL;
145 static const symbol_t *sym_naked = NULL;
146 static const symbol_t *sym_noinline = NULL;
147 static const symbol_t *sym_noreturn = NULL;
148 static const symbol_t *sym_nothrow = NULL;
149 static const symbol_t *sym_novtable = NULL;
150 static const symbol_t *sym_property = NULL;
151 static const symbol_t *sym_get = NULL;
152 static const symbol_t *sym_put = NULL;
153 static const symbol_t *sym_selectany = NULL;
154 static const symbol_t *sym_thread = NULL;
155 static const symbol_t *sym_uuid = NULL;
156 static const symbol_t *sym_deprecated = NULL;
157 static const symbol_t *sym_restrict = NULL;
158 static const symbol_t *sym_noalias = NULL;
160 /** The token anchor set */
161 static unsigned char token_anchor_set[T_LAST_TOKEN];
163 /** The current source position. */
164 #define HERE (&token.source_position)
166 static type_t *type_valist;
168 static statement_t *parse_compound_statement(bool inside_expression_statement);
169 static statement_t *parse_statement(void);
171 static expression_t *parse_sub_expression(unsigned precedence);
172 static expression_t *parse_expression(void);
173 static type_t *parse_typename(void);
175 static void parse_compound_type_entries(declaration_t *compound_declaration);
176 static declaration_t *parse_declarator(
177 const declaration_specifiers_t *specifiers, bool may_be_abstract);
178 static declaration_t *record_declaration(declaration_t *declaration, bool is_definition);
180 static void semantic_comparison(binary_expression_t *expression);
182 #define STORAGE_CLASSES \
190 #define TYPE_QUALIFIERS \
195 case T__forceinline: \
196 case T___attribute__:
198 #ifdef PROVIDE_COMPLEX
199 #define COMPLEX_SPECIFIERS \
201 #define IMAGINARY_SPECIFIERS \
204 #define COMPLEX_SPECIFIERS
205 #define IMAGINARY_SPECIFIERS
208 #define TYPE_SPECIFIERS \
223 case T___builtin_va_list: \
228 #define DECLARATION_START \
233 #define TYPENAME_START \
238 * Allocate an AST node with given size and
239 * initialize all fields with zero.
241 static void *allocate_ast_zero(size_t size)
243 void *res = allocate_ast(size);
244 memset(res, 0, size);
248 static declaration_t *allocate_declaration_zero(void)
250 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
251 declaration->type = type_error_type;
252 declaration->alignment = 0;
257 * Returns the size of a statement node.
259 * @param kind the statement kind
261 static size_t get_statement_struct_size(statement_kind_t kind)
263 static const size_t sizes[] = {
264 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
265 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
266 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
267 [STATEMENT_RETURN] = sizeof(return_statement_t),
268 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
269 [STATEMENT_IF] = sizeof(if_statement_t),
270 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
271 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
272 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
273 [STATEMENT_BREAK] = sizeof(statement_base_t),
274 [STATEMENT_GOTO] = sizeof(goto_statement_t),
275 [STATEMENT_LABEL] = sizeof(label_statement_t),
276 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
277 [STATEMENT_WHILE] = sizeof(while_statement_t),
278 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
279 [STATEMENT_FOR] = sizeof(for_statement_t),
280 [STATEMENT_ASM] = sizeof(asm_statement_t),
281 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
282 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
284 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
285 assert(sizes[kind] != 0);
290 * Returns the size of an expression node.
292 * @param kind the expression kind
294 static size_t get_expression_struct_size(expression_kind_t kind)
296 static const size_t sizes[] = {
297 [EXPR_INVALID] = sizeof(expression_base_t),
298 [EXPR_REFERENCE] = sizeof(reference_expression_t),
299 [EXPR_CONST] = sizeof(const_expression_t),
300 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
301 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
302 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
303 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
304 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
305 [EXPR_CALL] = sizeof(call_expression_t),
306 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
307 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
308 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
309 [EXPR_SELECT] = sizeof(select_expression_t),
310 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
311 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
312 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
313 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
314 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
315 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
316 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
317 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
318 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
319 [EXPR_VA_START] = sizeof(va_start_expression_t),
320 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
321 [EXPR_STATEMENT] = sizeof(statement_expression_t),
322 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
324 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
325 return sizes[EXPR_UNARY_FIRST];
327 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
328 return sizes[EXPR_BINARY_FIRST];
330 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
331 assert(sizes[kind] != 0);
336 * Allocate a statement node of given kind and initialize all
339 static statement_t *allocate_statement_zero(statement_kind_t kind)
341 size_t size = get_statement_struct_size(kind);
342 statement_t *res = allocate_ast_zero(size);
344 res->base.kind = kind;
345 res->base.parent = current_parent;
350 * Allocate an expression node of given kind and initialize all
353 static expression_t *allocate_expression_zero(expression_kind_t kind)
355 size_t size = get_expression_struct_size(kind);
356 expression_t *res = allocate_ast_zero(size);
358 res->base.kind = kind;
359 res->base.type = type_error_type;
364 * Creates a new invalid expression.
366 static expression_t *create_invalid_expression(void)
368 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
369 expression->base.source_position = token.source_position;
374 * Creates a new invalid statement.
376 static statement_t *create_invalid_statement(void)
378 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
379 statement->base.source_position = token.source_position;
384 * Allocate a new empty statement.
386 static statement_t *create_empty_statement(void)
388 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
389 statement->base.source_position = token.source_position;
394 * Returns the size of a type node.
396 * @param kind the type kind
398 static size_t get_type_struct_size(type_kind_t kind)
400 static const size_t sizes[] = {
401 [TYPE_ATOMIC] = sizeof(atomic_type_t),
402 [TYPE_COMPLEX] = sizeof(complex_type_t),
403 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
404 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
405 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
406 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
407 [TYPE_ENUM] = sizeof(enum_type_t),
408 [TYPE_FUNCTION] = sizeof(function_type_t),
409 [TYPE_POINTER] = sizeof(pointer_type_t),
410 [TYPE_ARRAY] = sizeof(array_type_t),
411 [TYPE_BUILTIN] = sizeof(builtin_type_t),
412 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
413 [TYPE_TYPEOF] = sizeof(typeof_type_t),
415 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
416 assert(kind <= TYPE_TYPEOF);
417 assert(sizes[kind] != 0);
422 * Allocate a type node of given kind and initialize all
425 * @param kind type kind to allocate
426 * @param source_position the source position of the type definition
428 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
430 size_t size = get_type_struct_size(kind);
431 type_t *res = obstack_alloc(type_obst, size);
432 memset(res, 0, size);
434 res->base.kind = kind;
435 res->base.source_position = *source_position;
440 * Returns the size of an initializer node.
442 * @param kind the initializer kind
444 static size_t get_initializer_size(initializer_kind_t kind)
446 static const size_t sizes[] = {
447 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
448 [INITIALIZER_STRING] = sizeof(initializer_string_t),
449 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
450 [INITIALIZER_LIST] = sizeof(initializer_list_t),
451 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
453 assert(kind < sizeof(sizes) / sizeof(*sizes));
454 assert(sizes[kind] != 0);
459 * Allocate an initializer node of given kind and initialize all
462 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
464 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
471 * Free a type from the type obstack.
473 static void free_type(void *type)
475 obstack_free(type_obst, type);
479 * Returns the index of the top element of the environment stack.
481 static size_t environment_top(void)
483 return ARR_LEN(environment_stack);
487 * Returns the index of the top element of the global label stack.
489 static size_t label_top(void)
491 return ARR_LEN(label_stack);
495 * Returns the index of the top element of the local label stack.
497 static size_t local_label_top(void)
499 return ARR_LEN(local_label_stack);
503 * Return the next token.
505 static inline void next_token(void)
507 token = lookahead_buffer[lookahead_bufpos];
508 lookahead_buffer[lookahead_bufpos] = lexer_token;
511 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
514 print_token(stderr, &token);
515 fprintf(stderr, "\n");
520 * Return the next token with a given lookahead.
522 static inline const token_t *look_ahead(int num)
524 assert(num > 0 && num <= MAX_LOOKAHEAD);
525 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
526 return &lookahead_buffer[pos];
530 * Adds a token to the token anchor set (a multi-set).
532 static void add_anchor_token(int token_type)
534 assert(0 <= token_type && token_type < T_LAST_TOKEN);
535 ++token_anchor_set[token_type];
538 static int save_and_reset_anchor_state(int token_type)
540 assert(0 <= token_type && token_type < T_LAST_TOKEN);
541 int count = token_anchor_set[token_type];
542 token_anchor_set[token_type] = 0;
546 static void restore_anchor_state(int token_type, int count)
548 assert(0 <= token_type && token_type < T_LAST_TOKEN);
549 token_anchor_set[token_type] = count;
553 * Remove a token from the token anchor set (a multi-set).
555 static void rem_anchor_token(int token_type)
557 assert(0 <= token_type && token_type < T_LAST_TOKEN);
558 assert(token_anchor_set[token_type] != 0);
559 --token_anchor_set[token_type];
562 static bool at_anchor(void)
566 return token_anchor_set[token.type];
570 * Eat tokens until a matching token is found.
572 static void eat_until_matching_token(int type)
576 case '(': end_token = ')'; break;
577 case '{': end_token = '}'; break;
578 case '[': end_token = ']'; break;
579 default: end_token = type; break;
582 unsigned parenthesis_count = 0;
583 unsigned brace_count = 0;
584 unsigned bracket_count = 0;
585 while (token.type != end_token ||
586 parenthesis_count != 0 ||
588 bracket_count != 0) {
589 switch (token.type) {
591 case '(': ++parenthesis_count; break;
592 case '{': ++brace_count; break;
593 case '[': ++bracket_count; break;
596 if (parenthesis_count > 0)
606 if (bracket_count > 0)
609 if (token.type == end_token &&
610 parenthesis_count == 0 &&
624 * Eat input tokens until an anchor is found.
626 static void eat_until_anchor(void)
628 if (token.type == T_EOF)
630 while (token_anchor_set[token.type] == 0) {
631 if (token.type == '(' || token.type == '{' || token.type == '[')
632 eat_until_matching_token(token.type);
633 if (token.type == T_EOF)
639 static void eat_block(void)
641 eat_until_matching_token('{');
642 if (token.type == '}')
647 * eat all token until a ';' is reached or a stop token is found.
649 static void eat_statement(void)
651 eat_until_matching_token(';');
652 if (token.type == ';')
656 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while (0)
659 * Report a parse error because an expected token was not found.
662 #if defined __GNUC__ && __GNUC__ >= 4
663 __attribute__((sentinel))
665 void parse_error_expected(const char *message, ...)
667 if (message != NULL) {
668 errorf(HERE, "%s", message);
671 va_start(ap, message);
672 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
677 * Report a type error.
679 static void type_error(const char *msg, const source_position_t *source_position,
682 errorf(source_position, "%s, but found type '%T'", msg, type);
686 * Report an incompatible type.
688 static void type_error_incompatible(const char *msg,
689 const source_position_t *source_position, type_t *type1, type_t *type2)
691 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
696 * Expect the the current token is the expected token.
697 * If not, generate an error, eat the current statement,
698 * and goto the end_error label.
700 #define expect(expected) \
702 if (UNLIKELY(token.type != (expected))) { \
703 parse_error_expected(NULL, (expected), NULL); \
704 add_anchor_token(expected); \
705 eat_until_anchor(); \
706 if (token.type == expected) \
708 rem_anchor_token(expected); \
714 static void set_scope(scope_t *new_scope)
717 scope->last_declaration = last_declaration;
721 last_declaration = new_scope->last_declaration;
725 * Search a symbol in a given namespace and returns its declaration or
726 * NULL if this symbol was not found.
728 static declaration_t *get_declaration(const symbol_t *const symbol,
729 const namespace_t namespc)
731 declaration_t *declaration = symbol->declaration;
732 for( ; declaration != NULL; declaration = declaration->symbol_next) {
733 if (declaration->namespc == namespc)
741 * pushs an environment_entry on the environment stack and links the
742 * corresponding symbol to the new entry
744 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
746 symbol_t *symbol = declaration->symbol;
747 namespace_t namespc = (namespace_t) declaration->namespc;
749 /* replace/add declaration into declaration list of the symbol */
750 declaration_t *iter = symbol->declaration;
752 symbol->declaration = declaration;
754 declaration_t *iter_last = NULL;
755 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
756 /* replace an entry? */
757 if (iter->namespc == namespc) {
758 if (iter_last == NULL) {
759 symbol->declaration = declaration;
761 iter_last->symbol_next = declaration;
763 declaration->symbol_next = iter->symbol_next;
768 assert(iter_last->symbol_next == NULL);
769 iter_last->symbol_next = declaration;
773 /* remember old declaration */
775 entry.symbol = symbol;
776 entry.old_declaration = iter;
777 entry.namespc = (unsigned short) namespc;
778 ARR_APP1(stack_entry_t, *stack_ptr, entry);
782 * Push a declaration on the environment stack.
784 * @param declaration the declaration
786 static void environment_push(declaration_t *declaration)
788 assert(declaration->source_position.input_name != NULL);
789 assert(declaration->parent_scope != NULL);
790 stack_push(&environment_stack, declaration);
794 * Push a declaration on the global label stack.
796 * @param declaration the declaration
798 static void label_push(declaration_t *declaration)
800 declaration->parent_scope = ¤t_function->scope;
801 stack_push(&label_stack, declaration);
805 * Push a declaration of the local label stack.
807 * @param declaration the declaration
809 static void local_label_push(declaration_t *declaration)
811 assert(declaration->parent_scope != NULL);
812 stack_push(&local_label_stack, declaration);
816 * pops symbols from the environment stack until @p new_top is the top element
818 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
820 stack_entry_t *stack = *stack_ptr;
821 size_t top = ARR_LEN(stack);
824 assert(new_top <= top);
828 for(i = top; i > new_top; --i) {
829 stack_entry_t *entry = &stack[i - 1];
831 declaration_t *old_declaration = entry->old_declaration;
832 symbol_t *symbol = entry->symbol;
833 namespace_t namespc = (namespace_t)entry->namespc;
835 /* replace/remove declaration */
836 declaration_t *declaration = symbol->declaration;
837 assert(declaration != NULL);
838 if (declaration->namespc == namespc) {
839 if (old_declaration == NULL) {
840 symbol->declaration = declaration->symbol_next;
842 symbol->declaration = old_declaration;
845 declaration_t *iter_last = declaration;
846 declaration_t *iter = declaration->symbol_next;
847 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
848 /* replace an entry? */
849 if (iter->namespc == namespc) {
850 assert(iter_last != NULL);
851 iter_last->symbol_next = old_declaration;
852 if (old_declaration != NULL) {
853 old_declaration->symbol_next = iter->symbol_next;
858 assert(iter != NULL);
862 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
866 * Pop all entries from the environment stack until the new_top
869 * @param new_top the new stack top
871 static void environment_pop_to(size_t new_top)
873 stack_pop_to(&environment_stack, new_top);
877 * Pop all entries from the global label stack until the new_top
880 * @param new_top the new stack top
882 static void label_pop_to(size_t new_top)
884 stack_pop_to(&label_stack, new_top);
888 * Pop all entries from the local label stack until the new_top
891 * @param new_top the new stack top
893 static void local_label_pop_to(size_t new_top)
895 stack_pop_to(&local_label_stack, new_top);
899 static int get_akind_rank(atomic_type_kind_t akind)
904 static int get_rank(const type_t *type)
906 assert(!is_typeref(type));
907 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
908 * and esp. footnote 108). However we can't fold constants (yet), so we
909 * can't decide whether unsigned int is possible, while int always works.
910 * (unsigned int would be preferable when possible... for stuff like
911 * struct { enum { ... } bla : 4; } ) */
912 if (type->kind == TYPE_ENUM)
913 return get_akind_rank(ATOMIC_TYPE_INT);
915 assert(type->kind == TYPE_ATOMIC);
916 return get_akind_rank(type->atomic.akind);
919 static type_t *promote_integer(type_t *type)
921 if (type->kind == TYPE_BITFIELD)
922 type = type->bitfield.base_type;
924 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
931 * Create a cast expression.
933 * @param expression the expression to cast
934 * @param dest_type the destination type
936 static expression_t *create_cast_expression(expression_t *expression,
939 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
941 cast->unary.value = expression;
942 cast->base.type = dest_type;
948 * Check if a given expression represents the 0 pointer constant.
950 static bool is_null_pointer_constant(const expression_t *expression)
952 /* skip void* cast */
953 if (expression->kind == EXPR_UNARY_CAST
954 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
955 expression = expression->unary.value;
958 /* TODO: not correct yet, should be any constant integer expression
959 * which evaluates to 0 */
960 if (expression->kind != EXPR_CONST)
963 type_t *const type = skip_typeref(expression->base.type);
964 if (!is_type_integer(type))
967 return expression->conste.v.int_value == 0;
971 * Create an implicit cast expression.
973 * @param expression the expression to cast
974 * @param dest_type the destination type
976 static expression_t *create_implicit_cast(expression_t *expression,
979 type_t *const source_type = expression->base.type;
981 if (source_type == dest_type)
984 return create_cast_expression(expression, dest_type);
987 typedef enum assign_error_t {
989 ASSIGN_ERROR_INCOMPATIBLE,
990 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
991 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
992 ASSIGN_WARNING_POINTER_FROM_INT,
993 ASSIGN_WARNING_INT_FROM_POINTER
996 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
997 const expression_t *const right,
999 const source_position_t *source_position)
1001 type_t *const orig_type_right = right->base.type;
1002 type_t *const type_left = skip_typeref(orig_type_left);
1003 type_t *const type_right = skip_typeref(orig_type_right);
1006 case ASSIGN_SUCCESS:
1008 case ASSIGN_ERROR_INCOMPATIBLE:
1009 errorf(source_position,
1010 "destination type '%T' in %s is incompatible with type '%T'",
1011 orig_type_left, context, orig_type_right);
1014 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1015 type_t *points_to_left
1016 = skip_typeref(type_left->pointer.points_to);
1017 type_t *points_to_right
1018 = skip_typeref(type_right->pointer.points_to);
1020 /* the left type has all qualifiers from the right type */
1021 unsigned missing_qualifiers
1022 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1023 warningf(source_position,
1024 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1025 orig_type_left, context, orig_type_right, missing_qualifiers);
1029 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1030 warningf(source_position,
1031 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1032 orig_type_left, context, right, orig_type_right);
1035 case ASSIGN_WARNING_POINTER_FROM_INT:
1036 warningf(source_position,
1037 "%s makes pointer '%T' from integer '%T' without a cast",
1038 context, orig_type_left, orig_type_right);
1041 case ASSIGN_WARNING_INT_FROM_POINTER:
1042 warningf(source_position,
1043 "%s makes integer '%T' from pointer '%T' without a cast",
1044 context, orig_type_left, orig_type_right);
1048 panic("invalid error value");
1052 /** Implements the rules from § 6.5.16.1 */
1053 static assign_error_t semantic_assign(type_t *orig_type_left,
1054 const expression_t *const right)
1056 type_t *const orig_type_right = right->base.type;
1057 type_t *const type_left = skip_typeref(orig_type_left);
1058 type_t *const type_right = skip_typeref(orig_type_right);
1060 if (is_type_pointer(type_left)) {
1061 if (is_null_pointer_constant(right)) {
1062 return ASSIGN_SUCCESS;
1063 } else if (is_type_pointer(type_right)) {
1064 type_t *points_to_left
1065 = skip_typeref(type_left->pointer.points_to);
1066 type_t *points_to_right
1067 = skip_typeref(type_right->pointer.points_to);
1068 assign_error_t res = ASSIGN_SUCCESS;
1070 /* the left type has all qualifiers from the right type */
1071 unsigned missing_qualifiers
1072 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1073 if (missing_qualifiers != 0) {
1074 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1077 points_to_left = get_unqualified_type(points_to_left);
1078 points_to_right = get_unqualified_type(points_to_right);
1080 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
1081 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1085 if (!types_compatible(points_to_left, points_to_right)) {
1086 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1090 } else if (is_type_integer(type_right)) {
1091 return ASSIGN_WARNING_POINTER_FROM_INT;
1093 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1094 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1095 && is_type_pointer(type_right))) {
1096 return ASSIGN_SUCCESS;
1097 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1098 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1099 type_t *const unqual_type_left = get_unqualified_type(type_left);
1100 type_t *const unqual_type_right = get_unqualified_type(type_right);
1101 if (types_compatible(unqual_type_left, unqual_type_right)) {
1102 return ASSIGN_SUCCESS;
1104 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1105 return ASSIGN_WARNING_INT_FROM_POINTER;
1108 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1109 return ASSIGN_SUCCESS;
1111 return ASSIGN_ERROR_INCOMPATIBLE;
1114 static expression_t *parse_constant_expression(void)
1116 /* start parsing at precedence 7 (conditional expression) */
1117 expression_t *result = parse_sub_expression(7);
1119 if (!is_constant_expression(result)) {
1120 errorf(&result->base.source_position,
1121 "expression '%E' is not constant\n", result);
1127 static expression_t *parse_assignment_expression(void)
1129 /* start parsing at precedence 2 (assignment expression) */
1130 return parse_sub_expression(2);
1133 static type_t *make_global_typedef(const char *name, type_t *type)
1135 symbol_t *const symbol = symbol_table_insert(name);
1137 declaration_t *const declaration = allocate_declaration_zero();
1138 declaration->namespc = NAMESPACE_NORMAL;
1139 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
1140 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1141 declaration->type = type;
1142 declaration->symbol = symbol;
1143 declaration->source_position = builtin_source_position;
1144 declaration->implicit = true;
1146 record_declaration(declaration, false);
1148 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1149 typedef_type->typedeft.declaration = declaration;
1151 return typedef_type;
1154 static string_t parse_string_literals(void)
1156 assert(token.type == T_STRING_LITERAL);
1157 string_t result = token.v.string;
1161 while (token.type == T_STRING_LITERAL) {
1162 result = concat_strings(&result, &token.v.string);
1169 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1170 [GNU_AK_CONST] = "const",
1171 [GNU_AK_VOLATILE] = "volatile",
1172 [GNU_AK_CDECL] = "cdecl",
1173 [GNU_AK_STDCALL] = "stdcall",
1174 [GNU_AK_FASTCALL] = "fastcall",
1175 [GNU_AK_DEPRECATED] = "deprecated",
1176 [GNU_AK_NOINLINE] = "noinline",
1177 [GNU_AK_NORETURN] = "noreturn",
1178 [GNU_AK_NAKED] = "naked",
1179 [GNU_AK_PURE] = "pure",
1180 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1181 [GNU_AK_MALLOC] = "malloc",
1182 [GNU_AK_WEAK] = "weak",
1183 [GNU_AK_CONSTRUCTOR] = "constructor",
1184 [GNU_AK_DESTRUCTOR] = "destructor",
1185 [GNU_AK_NOTHROW] = "nothrow",
1186 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1187 [GNU_AK_COMMON] = "common",
1188 [GNU_AK_NOCOMMON] = "nocommon",
1189 [GNU_AK_PACKED] = "packed",
1190 [GNU_AK_SHARED] = "shared",
1191 [GNU_AK_NOTSHARED] = "notshared",
1192 [GNU_AK_USED] = "used",
1193 [GNU_AK_UNUSED] = "unused",
1194 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1195 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1196 [GNU_AK_LONGCALL] = "longcall",
1197 [GNU_AK_SHORTCALL] = "shortcall",
1198 [GNU_AK_LONG_CALL] = "long_call",
1199 [GNU_AK_SHORT_CALL] = "short_call",
1200 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1201 [GNU_AK_INTERRUPT] = "interrupt",
1202 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1203 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1204 [GNU_AK_NESTING] = "nesting",
1205 [GNU_AK_NEAR] = "near",
1206 [GNU_AK_FAR] = "far",
1207 [GNU_AK_SIGNAL] = "signal",
1208 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1209 [GNU_AK_TINY_DATA] = "tiny_data",
1210 [GNU_AK_SAVEALL] = "saveall",
1211 [GNU_AK_FLATTEN] = "flatten",
1212 [GNU_AK_SSEREGPARM] = "sseregparm",
1213 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1214 [GNU_AK_RETURN_TWICE] = "return_twice",
1215 [GNU_AK_MAY_ALIAS] = "may_alias",
1216 [GNU_AK_MS_STRUCT] = "ms_struct",
1217 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1218 [GNU_AK_DLLIMPORT] = "dllimport",
1219 [GNU_AK_DLLEXPORT] = "dllexport",
1220 [GNU_AK_ALIGNED] = "aligned",
1221 [GNU_AK_ALIAS] = "alias",
1222 [GNU_AK_SECTION] = "section",
1223 [GNU_AK_FORMAT] = "format",
1224 [GNU_AK_FORMAT_ARG] = "format_arg",
1225 [GNU_AK_WEAKREF] = "weakref",
1226 [GNU_AK_NONNULL] = "nonnull",
1227 [GNU_AK_TLS_MODEL] = "tls_model",
1228 [GNU_AK_VISIBILITY] = "visibility",
1229 [GNU_AK_REGPARM] = "regparm",
1230 [GNU_AK_MODE] = "mode",
1231 [GNU_AK_MODEL] = "model",
1232 [GNU_AK_TRAP_EXIT] = "trap_exit",
1233 [GNU_AK_SP_SWITCH] = "sp_switch",
1234 [GNU_AK_SENTINEL] = "sentinel"
1238 * compare two string, ignoring double underscores on the second.
1240 static int strcmp_underscore(const char *s1, const char *s2)
1242 if (s2[0] == '_' && s2[1] == '_') {
1243 size_t len2 = strlen(s2);
1244 size_t len1 = strlen(s1);
1245 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1246 return strncmp(s1, s2+2, len2-4);
1250 return strcmp(s1, s2);
1254 * Allocate a new gnu temporal attribute.
1256 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1258 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1259 attribute->kind = kind;
1260 attribute->next = NULL;
1261 attribute->invalid = false;
1262 attribute->have_arguments = false;
1268 * parse one constant expression argument.
1270 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1272 expression_t *expression;
1273 add_anchor_token(')');
1274 expression = parse_constant_expression();
1275 rem_anchor_token(')');
1277 attribute->u.argument = fold_constant(expression);
1280 attribute->invalid = true;
1284 * parse a list of constant expressions arguments.
1286 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1288 argument_list_t **list = &attribute->u.arguments;
1289 argument_list_t *entry;
1290 expression_t *expression;
1291 add_anchor_token(')');
1292 add_anchor_token(',');
1294 expression = parse_constant_expression();
1295 entry = obstack_alloc(&temp_obst, sizeof(entry));
1296 entry->argument = fold_constant(expression);
1299 list = &entry->next;
1300 if (token.type != ',')
1304 rem_anchor_token(',');
1305 rem_anchor_token(')');
1309 attribute->invalid = true;
1313 * parse one string literal argument.
1315 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1318 add_anchor_token('(');
1319 if (token.type != T_STRING_LITERAL) {
1320 parse_error_expected("while parsing attribute directive",
1321 T_STRING_LITERAL, NULL);
1324 *string = parse_string_literals();
1325 rem_anchor_token('(');
1329 attribute->invalid = true;
1333 * parse one tls model.
1335 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1337 static const char *const tls_models[] = {
1343 string_t string = { NULL, 0 };
1344 parse_gnu_attribute_string_arg(attribute, &string);
1345 if (string.begin != NULL) {
1346 for(size_t i = 0; i < 4; ++i) {
1347 if (strcmp(tls_models[i], string.begin) == 0) {
1348 attribute->u.value = i;
1352 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1354 attribute->invalid = true;
1358 * parse one tls model.
1360 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1362 static const char *const visibilities[] = {
1368 string_t string = { NULL, 0 };
1369 parse_gnu_attribute_string_arg(attribute, &string);
1370 if (string.begin != NULL) {
1371 for(size_t i = 0; i < 4; ++i) {
1372 if (strcmp(visibilities[i], string.begin) == 0) {
1373 attribute->u.value = i;
1377 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1379 attribute->invalid = true;
1383 * parse one (code) model.
1385 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1387 static const char *const visibilities[] = {
1392 string_t string = { NULL, 0 };
1393 parse_gnu_attribute_string_arg(attribute, &string);
1394 if (string.begin != NULL) {
1395 for(int i = 0; i < 3; ++i) {
1396 if (strcmp(visibilities[i], string.begin) == 0) {
1397 attribute->u.value = i;
1401 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1403 attribute->invalid = true;
1406 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1408 /* TODO: find out what is allowed here... */
1410 /* at least: byte, word, pointer, list of machine modes
1411 * __XXX___ is interpreted as XXX */
1412 add_anchor_token(')');
1414 if (token.type != T_IDENTIFIER) {
1415 expect(T_IDENTIFIER);
1418 /* This isn't really correct, the backend should provide a list of machine
1419 * specific modes (according to gcc philosophy that is...) */
1420 const char *symbol_str = token.v.symbol->string;
1421 if (strcmp_underscore("QI", symbol_str) == 0 ||
1422 strcmp_underscore("byte", symbol_str) == 0) {
1423 attribute->u.akind = ATOMIC_TYPE_CHAR;
1424 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1425 attribute->u.akind = ATOMIC_TYPE_SHORT;
1426 } else if (strcmp_underscore("SI", symbol_str) == 0
1427 || strcmp_underscore("word", symbol_str) == 0
1428 || strcmp_underscore("pointer", symbol_str) == 0) {
1429 attribute->u.akind = ATOMIC_TYPE_INT;
1430 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1431 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1433 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1434 attribute->invalid = true;
1438 rem_anchor_token(')');
1442 attribute->invalid = true;
1446 * parse one interrupt argument.
1448 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1450 static const char *const interrupts[] = {
1457 string_t string = { NULL, 0 };
1458 parse_gnu_attribute_string_arg(attribute, &string);
1459 if (string.begin != NULL) {
1460 for(size_t i = 0; i < 5; ++i) {
1461 if (strcmp(interrupts[i], string.begin) == 0) {
1462 attribute->u.value = i;
1466 errorf(HERE, "'%s' is not an interrupt", string.begin);
1468 attribute->invalid = true;
1472 * parse ( identifier, const expression, const expression )
1474 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1476 static const char *const format_names[] = {
1484 if (token.type != T_IDENTIFIER) {
1485 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1488 const char *name = token.v.symbol->string;
1489 for(i = 0; i < 4; ++i) {
1490 if (strcmp_underscore(format_names[i], name) == 0)
1494 if (warning.attribute)
1495 warningf(HERE, "'%s' is an unrecognized format function type", name);
1500 add_anchor_token(')');
1501 add_anchor_token(',');
1502 parse_constant_expression();
1503 rem_anchor_token(',');
1504 rem_anchor_token(')');
1507 add_anchor_token(')');
1508 parse_constant_expression();
1509 rem_anchor_token(')');
1513 attribute->u.value = true;
1516 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1518 if (!attribute->have_arguments)
1521 /* should have no arguments */
1522 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1523 eat_until_matching_token('(');
1524 /* we have already consumed '(', so we stop before ')', eat it */
1526 attribute->invalid = true;
1530 * Parse one GNU attribute.
1532 * Note that attribute names can be specified WITH or WITHOUT
1533 * double underscores, ie const or __const__.
1535 * The following attributes are parsed without arguments
1560 * no_instrument_function
1561 * warn_unused_result
1578 * externally_visible
1586 * The following attributes are parsed with arguments
1587 * aligned( const expression )
1588 * alias( string literal )
1589 * section( string literal )
1590 * format( identifier, const expression, const expression )
1591 * format_arg( const expression )
1592 * tls_model( string literal )
1593 * visibility( string literal )
1594 * regparm( const expression )
1595 * model( string leteral )
1596 * trap_exit( const expression )
1597 * sp_switch( string literal )
1599 * The following attributes might have arguments
1600 * weak_ref( string literal )
1601 * non_null( const expression // ',' )
1602 * interrupt( string literal )
1603 * sentinel( constant expression )
1605 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1607 gnu_attribute_t *head = *attributes;
1608 gnu_attribute_t *last = *attributes;
1609 decl_modifiers_t modifiers = 0;
1610 gnu_attribute_t *attribute;
1612 eat(T___attribute__);
1616 if (token.type != ')') {
1617 /* find the end of the list */
1619 while (last->next != NULL)
1623 /* non-empty attribute list */
1626 if (token.type == T_const) {
1628 } else if (token.type == T_volatile) {
1630 } else if (token.type == T_cdecl) {
1631 /* __attribute__((cdecl)), WITH ms mode */
1633 } else if (token.type == T_IDENTIFIER) {
1634 const symbol_t *sym = token.v.symbol;
1637 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1644 for(i = 0; i < GNU_AK_LAST; ++i) {
1645 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1648 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1651 if (kind == GNU_AK_LAST) {
1652 if (warning.attribute)
1653 warningf(HERE, "'%s' attribute directive ignored", name);
1655 /* skip possible arguments */
1656 if (token.type == '(') {
1657 eat_until_matching_token(')');
1660 /* check for arguments */
1661 attribute = allocate_gnu_attribute(kind);
1662 if (token.type == '(') {
1664 if (token.type == ')') {
1665 /* empty args are allowed */
1668 attribute->have_arguments = true;
1673 case GNU_AK_VOLATILE:
1678 case GNU_AK_NOCOMMON:
1680 case GNU_AK_NOTSHARED:
1681 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1682 case GNU_AK_WARN_UNUSED_RESULT:
1683 case GNU_AK_LONGCALL:
1684 case GNU_AK_SHORTCALL:
1685 case GNU_AK_LONG_CALL:
1686 case GNU_AK_SHORT_CALL:
1687 case GNU_AK_FUNCTION_VECTOR:
1688 case GNU_AK_INTERRUPT_HANDLER:
1689 case GNU_AK_NMI_HANDLER:
1690 case GNU_AK_NESTING:
1694 case GNU_AK_EIGTHBIT_DATA:
1695 case GNU_AK_TINY_DATA:
1696 case GNU_AK_SAVEALL:
1697 case GNU_AK_FLATTEN:
1698 case GNU_AK_SSEREGPARM:
1699 case GNU_AK_EXTERNALLY_VISIBLE:
1700 case GNU_AK_RETURN_TWICE:
1701 case GNU_AK_MAY_ALIAS:
1702 case GNU_AK_MS_STRUCT:
1703 case GNU_AK_GCC_STRUCT:
1706 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1707 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1708 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1709 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1710 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1711 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1712 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1713 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1714 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1715 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1716 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1717 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1718 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1719 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1720 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1721 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1722 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1724 case GNU_AK_ALIGNED:
1725 /* __align__ may be used without an argument */
1726 if (attribute->have_arguments) {
1727 parse_gnu_attribute_const_arg(attribute);
1731 case GNU_AK_FORMAT_ARG:
1732 case GNU_AK_REGPARM:
1733 case GNU_AK_TRAP_EXIT:
1734 if (!attribute->have_arguments) {
1735 /* should have arguments */
1736 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1737 attribute->invalid = true;
1739 parse_gnu_attribute_const_arg(attribute);
1742 case GNU_AK_SECTION:
1743 case GNU_AK_SP_SWITCH:
1744 if (!attribute->have_arguments) {
1745 /* should have arguments */
1746 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1747 attribute->invalid = true;
1749 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1752 if (!attribute->have_arguments) {
1753 /* should have arguments */
1754 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1755 attribute->invalid = true;
1757 parse_gnu_attribute_format_args(attribute);
1759 case GNU_AK_WEAKREF:
1760 /* may have one string argument */
1761 if (attribute->have_arguments)
1762 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1764 case GNU_AK_NONNULL:
1765 if (attribute->have_arguments)
1766 parse_gnu_attribute_const_arg_list(attribute);
1768 case GNU_AK_TLS_MODEL:
1769 if (!attribute->have_arguments) {
1770 /* should have arguments */
1771 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1773 parse_gnu_attribute_tls_model_arg(attribute);
1775 case GNU_AK_VISIBILITY:
1776 if (!attribute->have_arguments) {
1777 /* should have arguments */
1778 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1780 parse_gnu_attribute_visibility_arg(attribute);
1783 if (!attribute->have_arguments) {
1784 /* should have arguments */
1785 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1787 parse_gnu_attribute_model_arg(attribute);
1791 if (!attribute->have_arguments) {
1792 /* should have arguments */
1793 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1795 parse_gnu_attribute_mode_arg(attribute);
1798 case GNU_AK_INTERRUPT:
1799 /* may have one string argument */
1800 if (attribute->have_arguments)
1801 parse_gnu_attribute_interrupt_arg(attribute);
1803 case GNU_AK_SENTINEL:
1804 /* may have one string argument */
1805 if (attribute->have_arguments)
1806 parse_gnu_attribute_const_arg(attribute);
1809 /* already handled */
1813 check_no_argument(attribute, name);
1816 if (attribute != NULL) {
1818 last->next = attribute;
1821 head = last = attribute;
1825 if (token.type != ',')
1839 * Parse GNU attributes.
1841 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1843 decl_modifiers_t modifiers = 0;
1846 switch(token.type) {
1847 case T___attribute__:
1848 modifiers |= parse_gnu_attribute(attributes);
1854 if (token.type != T_STRING_LITERAL) {
1855 parse_error_expected("while parsing assembler attribute",
1856 T_STRING_LITERAL, NULL);
1857 eat_until_matching_token('(');
1860 parse_string_literals();
1865 case T_cdecl: modifiers |= DM_CDECL; break;
1866 case T__fastcall: modifiers |= DM_FASTCALL; break;
1867 case T__stdcall: modifiers |= DM_STDCALL; break;
1870 /* TODO record modifier */
1871 warningf(HERE, "Ignoring declaration modifier %K", &token);
1875 default: return modifiers;
1882 static designator_t *parse_designation(void)
1884 designator_t *result = NULL;
1885 designator_t *last = NULL;
1888 designator_t *designator;
1889 switch(token.type) {
1891 designator = allocate_ast_zero(sizeof(designator[0]));
1892 designator->source_position = token.source_position;
1894 add_anchor_token(']');
1895 designator->array_index = parse_constant_expression();
1896 rem_anchor_token(']');
1900 designator = allocate_ast_zero(sizeof(designator[0]));
1901 designator->source_position = token.source_position;
1903 if (token.type != T_IDENTIFIER) {
1904 parse_error_expected("while parsing designator",
1905 T_IDENTIFIER, NULL);
1908 designator->symbol = token.v.symbol;
1916 assert(designator != NULL);
1918 last->next = designator;
1920 result = designator;
1928 static initializer_t *initializer_from_string(array_type_t *type,
1929 const string_t *const string)
1931 /* TODO: check len vs. size of array type */
1934 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1935 initializer->string.string = *string;
1940 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1941 wide_string_t *const string)
1943 /* TODO: check len vs. size of array type */
1946 initializer_t *const initializer =
1947 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1948 initializer->wide_string.string = *string;
1954 * Build an initializer from a given expression.
1956 static initializer_t *initializer_from_expression(type_t *orig_type,
1957 expression_t *expression)
1959 /* TODO check that expression is a constant expression */
1961 /* § 6.7.8.14/15 char array may be initialized by string literals */
1962 type_t *type = skip_typeref(orig_type);
1963 type_t *expr_type_orig = expression->base.type;
1964 type_t *expr_type = skip_typeref(expr_type_orig);
1965 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1966 array_type_t *const array_type = &type->array;
1967 type_t *const element_type = skip_typeref(array_type->element_type);
1969 if (element_type->kind == TYPE_ATOMIC) {
1970 atomic_type_kind_t akind = element_type->atomic.akind;
1971 switch (expression->kind) {
1972 case EXPR_STRING_LITERAL:
1973 if (akind == ATOMIC_TYPE_CHAR
1974 || akind == ATOMIC_TYPE_SCHAR
1975 || akind == ATOMIC_TYPE_UCHAR) {
1976 return initializer_from_string(array_type,
1977 &expression->string.value);
1980 case EXPR_WIDE_STRING_LITERAL: {
1981 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1982 if (get_unqualified_type(element_type) == bare_wchar_type) {
1983 return initializer_from_wide_string(array_type,
1984 &expression->wide_string.value);
1994 assign_error_t error = semantic_assign(type, expression);
1995 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1997 report_assign_error(error, type, expression, "initializer",
1998 &expression->base.source_position);
2000 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
2001 result->value.value = create_implicit_cast(expression, type);
2007 * Checks if a given expression can be used as an constant initializer.
2009 static bool is_initializer_constant(const expression_t *expression)
2011 return is_constant_expression(expression)
2012 || is_address_constant(expression);
2016 * Parses an scalar initializer.
2018 * § 6.7.8.11; eat {} without warning
2020 static initializer_t *parse_scalar_initializer(type_t *type,
2021 bool must_be_constant)
2023 /* there might be extra {} hierarchies */
2025 if (token.type == '{') {
2026 warningf(HERE, "extra curly braces around scalar initializer");
2030 } while (token.type == '{');
2033 expression_t *expression = parse_assignment_expression();
2034 if (must_be_constant && !is_initializer_constant(expression)) {
2035 errorf(&expression->base.source_position,
2036 "Initialisation expression '%E' is not constant\n",
2040 initializer_t *initializer = initializer_from_expression(type, expression);
2042 if (initializer == NULL) {
2043 errorf(&expression->base.source_position,
2044 "expression '%E' (type '%T') doesn't match expected type '%T'",
2045 expression, expression->base.type, type);
2050 bool additional_warning_displayed = false;
2051 while (braces > 0) {
2052 if (token.type == ',') {
2055 if (token.type != '}') {
2056 if (!additional_warning_displayed) {
2057 warningf(HERE, "additional elements in scalar initializer");
2058 additional_warning_displayed = true;
2069 * An entry in the type path.
2071 typedef struct type_path_entry_t type_path_entry_t;
2072 struct type_path_entry_t {
2073 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2075 size_t index; /**< For array types: the current index. */
2076 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2081 * A type path expression a position inside compound or array types.
2083 typedef struct type_path_t type_path_t;
2084 struct type_path_t {
2085 type_path_entry_t *path; /**< An flexible array containing the current path. */
2086 type_t *top_type; /**< type of the element the path points */
2087 size_t max_index; /**< largest index in outermost array */
2091 * Prints a type path for debugging.
2093 static __attribute__((unused)) void debug_print_type_path(
2094 const type_path_t *path)
2096 size_t len = ARR_LEN(path->path);
2098 for(size_t i = 0; i < len; ++i) {
2099 const type_path_entry_t *entry = & path->path[i];
2101 type_t *type = skip_typeref(entry->type);
2102 if (is_type_compound(type)) {
2103 /* in gcc mode structs can have no members */
2104 if (entry->v.compound_entry == NULL) {
2108 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2109 } else if (is_type_array(type)) {
2110 fprintf(stderr, "[%zu]", entry->v.index);
2112 fprintf(stderr, "-INVALID-");
2115 if (path->top_type != NULL) {
2116 fprintf(stderr, " (");
2117 print_type(path->top_type);
2118 fprintf(stderr, ")");
2123 * Return the top type path entry, ie. in a path
2124 * (type).a.b returns the b.
2126 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2128 size_t len = ARR_LEN(path->path);
2130 return &path->path[len-1];
2134 * Enlarge the type path by an (empty) element.
2136 static type_path_entry_t *append_to_type_path(type_path_t *path)
2138 size_t len = ARR_LEN(path->path);
2139 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2141 type_path_entry_t *result = & path->path[len];
2142 memset(result, 0, sizeof(result[0]));
2147 * Descending into a sub-type. Enter the scope of the current
2150 static void descend_into_subtype(type_path_t *path)
2152 type_t *orig_top_type = path->top_type;
2153 type_t *top_type = skip_typeref(orig_top_type);
2155 type_path_entry_t *top = append_to_type_path(path);
2156 top->type = top_type;
2158 if (is_type_compound(top_type)) {
2159 declaration_t *declaration = top_type->compound.declaration;
2160 declaration_t *entry = declaration->scope.declarations;
2161 top->v.compound_entry = entry;
2163 if (entry != NULL) {
2164 path->top_type = entry->type;
2166 path->top_type = NULL;
2168 } else if (is_type_array(top_type)) {
2170 path->top_type = top_type->array.element_type;
2172 assert(!is_type_valid(top_type));
2177 * Pop an entry from the given type path, ie. returning from
2178 * (type).a.b to (type).a
2180 static void ascend_from_subtype(type_path_t *path)
2182 type_path_entry_t *top = get_type_path_top(path);
2184 path->top_type = top->type;
2186 size_t len = ARR_LEN(path->path);
2187 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2191 * Pop entries from the given type path until the given
2192 * path level is reached.
2194 static void ascend_to(type_path_t *path, size_t top_path_level)
2196 size_t len = ARR_LEN(path->path);
2198 while (len > top_path_level) {
2199 ascend_from_subtype(path);
2200 len = ARR_LEN(path->path);
2204 static bool walk_designator(type_path_t *path, const designator_t *designator,
2205 bool used_in_offsetof)
2207 for( ; designator != NULL; designator = designator->next) {
2208 type_path_entry_t *top = get_type_path_top(path);
2209 type_t *orig_type = top->type;
2211 type_t *type = skip_typeref(orig_type);
2213 if (designator->symbol != NULL) {
2214 symbol_t *symbol = designator->symbol;
2215 if (!is_type_compound(type)) {
2216 if (is_type_valid(type)) {
2217 errorf(&designator->source_position,
2218 "'.%Y' designator used for non-compound type '%T'",
2224 declaration_t *declaration = type->compound.declaration;
2225 declaration_t *iter = declaration->scope.declarations;
2226 for( ; iter != NULL; iter = iter->next) {
2227 if (iter->symbol == symbol) {
2232 errorf(&designator->source_position,
2233 "'%T' has no member named '%Y'", orig_type, symbol);
2236 if (used_in_offsetof) {
2237 type_t *real_type = skip_typeref(iter->type);
2238 if (real_type->kind == TYPE_BITFIELD) {
2239 errorf(&designator->source_position,
2240 "offsetof designator '%Y' may not specify bitfield",
2246 top->type = orig_type;
2247 top->v.compound_entry = iter;
2248 orig_type = iter->type;
2250 expression_t *array_index = designator->array_index;
2251 assert(designator->array_index != NULL);
2253 if (!is_type_array(type)) {
2254 if (is_type_valid(type)) {
2255 errorf(&designator->source_position,
2256 "[%E] designator used for non-array type '%T'",
2257 array_index, orig_type);
2261 if (!is_type_valid(array_index->base.type)) {
2265 long index = fold_constant(array_index);
2266 if (!used_in_offsetof) {
2268 errorf(&designator->source_position,
2269 "array index [%E] must be positive", array_index);
2272 if (type->array.size_constant == true) {
2273 long array_size = type->array.size;
2274 if (index >= array_size) {
2275 errorf(&designator->source_position,
2276 "designator [%E] (%d) exceeds array size %d",
2277 array_index, index, array_size);
2283 top->type = orig_type;
2284 top->v.index = (size_t) index;
2285 orig_type = type->array.element_type;
2287 path->top_type = orig_type;
2289 if (designator->next != NULL) {
2290 descend_into_subtype(path);
2299 static void advance_current_object(type_path_t *path, size_t top_path_level)
2301 type_path_entry_t *top = get_type_path_top(path);
2303 type_t *type = skip_typeref(top->type);
2304 if (is_type_union(type)) {
2305 /* in unions only the first element is initialized */
2306 top->v.compound_entry = NULL;
2307 } else if (is_type_struct(type)) {
2308 declaration_t *entry = top->v.compound_entry;
2310 entry = entry->next;
2311 top->v.compound_entry = entry;
2312 if (entry != NULL) {
2313 path->top_type = entry->type;
2317 assert(is_type_array(type));
2321 if (!type->array.size_constant || top->v.index < type->array.size) {
2326 /* we're past the last member of the current sub-aggregate, try if we
2327 * can ascend in the type hierarchy and continue with another subobject */
2328 size_t len = ARR_LEN(path->path);
2330 if (len > top_path_level) {
2331 ascend_from_subtype(path);
2332 advance_current_object(path, top_path_level);
2334 path->top_type = NULL;
2339 * skip until token is found.
2341 static void skip_until(int type)
2343 while (token.type != type) {
2344 if (token.type == T_EOF)
2351 * skip any {...} blocks until a closing bracket is reached.
2353 static void skip_initializers(void)
2355 if (token.type == '{')
2358 while (token.type != '}') {
2359 if (token.type == T_EOF)
2361 if (token.type == '{') {
2369 static initializer_t *create_empty_initializer(void)
2371 static initializer_t empty_initializer
2372 = { .list = { { INITIALIZER_LIST }, 0 } };
2373 return &empty_initializer;
2377 * Parse a part of an initialiser for a struct or union,
2379 static initializer_t *parse_sub_initializer(type_path_t *path,
2380 type_t *outer_type, size_t top_path_level,
2381 parse_initializer_env_t *env)
2383 if (token.type == '}') {
2384 /* empty initializer */
2385 return create_empty_initializer();
2388 type_t *orig_type = path->top_type;
2389 type_t *type = NULL;
2391 if (orig_type == NULL) {
2392 /* We are initializing an empty compound. */
2394 type = skip_typeref(orig_type);
2396 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2397 * initializers in this case. */
2398 if (!is_type_valid(type)) {
2399 skip_initializers();
2400 return create_empty_initializer();
2404 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2407 designator_t *designator = NULL;
2408 if (token.type == '.' || token.type == '[') {
2409 designator = parse_designation();
2410 goto finish_designator;
2411 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2412 /* GNU-style designator ("identifier: value") */
2413 designator = allocate_ast_zero(sizeof(designator[0]));
2414 designator->source_position = token.source_position;
2415 designator->symbol = token.v.symbol;
2420 /* reset path to toplevel, evaluate designator from there */
2421 ascend_to(path, top_path_level);
2422 if (!walk_designator(path, designator, false)) {
2423 /* can't continue after designation error */
2427 initializer_t *designator_initializer
2428 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2429 designator_initializer->designator.designator = designator;
2430 ARR_APP1(initializer_t*, initializers, designator_initializer);
2432 orig_type = path->top_type;
2433 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2438 if (token.type == '{') {
2439 if (type != NULL && is_type_scalar(type)) {
2440 sub = parse_scalar_initializer(type, env->must_be_constant);
2444 if (env->declaration != NULL) {
2445 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2446 env->declaration->symbol);
2448 errorf(HERE, "extra brace group at end of initializer");
2451 descend_into_subtype(path);
2453 add_anchor_token('}');
2454 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2456 rem_anchor_token('}');
2459 ascend_from_subtype(path);
2463 goto error_parse_next;
2467 /* must be an expression */
2468 expression_t *expression = parse_assignment_expression();
2470 if (env->must_be_constant && !is_initializer_constant(expression)) {
2471 errorf(&expression->base.source_position,
2472 "Initialisation expression '%E' is not constant\n",
2477 /* we are already outside, ... */
2481 /* handle { "string" } special case */
2482 if ((expression->kind == EXPR_STRING_LITERAL
2483 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2484 && outer_type != NULL) {
2485 sub = initializer_from_expression(outer_type, expression);
2487 if (token.type == ',') {
2490 if (token.type != '}') {
2491 warningf(HERE, "excessive elements in initializer for type '%T'",
2494 /* TODO: eat , ... */
2499 /* descend into subtypes until expression matches type */
2501 orig_type = path->top_type;
2502 type = skip_typeref(orig_type);
2504 sub = initializer_from_expression(orig_type, expression);
2508 if (!is_type_valid(type)) {
2511 if (is_type_scalar(type)) {
2512 errorf(&expression->base.source_position,
2513 "expression '%E' doesn't match expected type '%T'",
2514 expression, orig_type);
2518 descend_into_subtype(path);
2522 /* update largest index of top array */
2523 const type_path_entry_t *first = &path->path[0];
2524 type_t *first_type = first->type;
2525 first_type = skip_typeref(first_type);
2526 if (is_type_array(first_type)) {
2527 size_t index = first->v.index;
2528 if (index > path->max_index)
2529 path->max_index = index;
2533 /* append to initializers list */
2534 ARR_APP1(initializer_t*, initializers, sub);
2537 if (env->declaration != NULL)
2538 warningf(HERE, "excess elements in struct initializer for '%Y'",
2539 env->declaration->symbol);
2541 warningf(HERE, "excess elements in struct initializer");
2545 if (token.type == '}') {
2549 if (token.type == '}') {
2554 /* advance to the next declaration if we are not at the end */
2555 advance_current_object(path, top_path_level);
2556 orig_type = path->top_type;
2557 if (orig_type != NULL)
2558 type = skip_typeref(orig_type);
2564 size_t len = ARR_LEN(initializers);
2565 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2566 initializer_t *result = allocate_ast_zero(size);
2567 result->kind = INITIALIZER_LIST;
2568 result->list.len = len;
2569 memcpy(&result->list.initializers, initializers,
2570 len * sizeof(initializers[0]));
2572 DEL_ARR_F(initializers);
2573 ascend_to(path, top_path_level+1);
2578 skip_initializers();
2579 DEL_ARR_F(initializers);
2580 ascend_to(path, top_path_level+1);
2585 * Parses an initializer. Parsers either a compound literal
2586 * (env->declaration == NULL) or an initializer of a declaration.
2588 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2590 type_t *type = skip_typeref(env->type);
2591 initializer_t *result = NULL;
2594 if (is_type_scalar(type)) {
2595 result = parse_scalar_initializer(type, env->must_be_constant);
2596 } else if (token.type == '{') {
2600 memset(&path, 0, sizeof(path));
2601 path.top_type = env->type;
2602 path.path = NEW_ARR_F(type_path_entry_t, 0);
2604 descend_into_subtype(&path);
2606 add_anchor_token('}');
2607 result = parse_sub_initializer(&path, env->type, 1, env);
2608 rem_anchor_token('}');
2610 max_index = path.max_index;
2611 DEL_ARR_F(path.path);
2615 /* parse_scalar_initializer() also works in this case: we simply
2616 * have an expression without {} around it */
2617 result = parse_scalar_initializer(type, env->must_be_constant);
2620 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2621 * the array type size */
2622 if (is_type_array(type) && type->array.size_expression == NULL
2623 && result != NULL) {
2625 switch (result->kind) {
2626 case INITIALIZER_LIST:
2627 size = max_index + 1;
2630 case INITIALIZER_STRING:
2631 size = result->string.string.size;
2634 case INITIALIZER_WIDE_STRING:
2635 size = result->wide_string.string.size;
2638 case INITIALIZER_DESIGNATOR:
2639 case INITIALIZER_VALUE:
2640 /* can happen for parse errors */
2645 internal_errorf(HERE, "invalid initializer type");
2648 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2649 cnst->base.type = type_size_t;
2650 cnst->conste.v.int_value = size;
2652 type_t *new_type = duplicate_type(type);
2654 new_type->array.size_expression = cnst;
2655 new_type->array.size_constant = true;
2656 new_type->array.size = size;
2657 env->type = new_type;
2665 static declaration_t *append_declaration(declaration_t *declaration);
2667 static declaration_t *parse_compound_type_specifier(bool is_struct)
2669 gnu_attribute_t *attributes = NULL;
2670 decl_modifiers_t modifiers = 0;
2677 symbol_t *symbol = NULL;
2678 declaration_t *declaration = NULL;
2680 if (token.type == T___attribute__) {
2681 modifiers |= parse_attributes(&attributes);
2684 if (token.type == T_IDENTIFIER) {
2685 symbol = token.v.symbol;
2688 namespace_t const namespc =
2689 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2690 declaration = get_declaration(symbol, namespc);
2691 if (declaration != NULL) {
2692 if (declaration->parent_scope != scope &&
2693 (token.type == '{' || token.type == ';')) {
2695 } else if (declaration->init.complete &&
2696 token.type == '{') {
2697 assert(symbol != NULL);
2698 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2699 is_struct ? "struct" : "union", symbol,
2700 &declaration->source_position);
2701 declaration->scope.declarations = NULL;
2704 } else if (token.type != '{') {
2706 parse_error_expected("while parsing struct type specifier",
2707 T_IDENTIFIER, '{', NULL);
2709 parse_error_expected("while parsing union type specifier",
2710 T_IDENTIFIER, '{', NULL);
2716 if (declaration == NULL) {
2717 declaration = allocate_declaration_zero();
2718 declaration->namespc =
2719 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2720 declaration->source_position = token.source_position;
2721 declaration->symbol = symbol;
2722 declaration->parent_scope = scope;
2723 if (symbol != NULL) {
2724 environment_push(declaration);
2726 append_declaration(declaration);
2729 if (token.type == '{') {
2730 declaration->init.complete = true;
2732 parse_compound_type_entries(declaration);
2733 modifiers |= parse_attributes(&attributes);
2736 declaration->modifiers |= modifiers;
2740 static void parse_enum_entries(type_t *const enum_type)
2744 if (token.type == '}') {
2746 errorf(HERE, "empty enum not allowed");
2750 add_anchor_token('}');
2752 if (token.type != T_IDENTIFIER) {
2753 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2755 rem_anchor_token('}');
2759 declaration_t *const entry = allocate_declaration_zero();
2760 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2761 entry->type = enum_type;
2762 entry->symbol = token.v.symbol;
2763 entry->source_position = token.source_position;
2766 if (token.type == '=') {
2768 expression_t *value = parse_constant_expression();
2770 value = create_implicit_cast(value, enum_type);
2771 entry->init.enum_value = value;
2776 record_declaration(entry, false);
2778 if (token.type != ',')
2781 } while (token.type != '}');
2782 rem_anchor_token('}');
2790 static type_t *parse_enum_specifier(void)
2792 gnu_attribute_t *attributes = NULL;
2793 declaration_t *declaration;
2797 if (token.type == T_IDENTIFIER) {
2798 symbol = token.v.symbol;
2801 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2802 } else if (token.type != '{') {
2803 parse_error_expected("while parsing enum type specifier",
2804 T_IDENTIFIER, '{', NULL);
2811 if (declaration == NULL) {
2812 declaration = allocate_declaration_zero();
2813 declaration->namespc = NAMESPACE_ENUM;
2814 declaration->source_position = token.source_position;
2815 declaration->symbol = symbol;
2816 declaration->parent_scope = scope;
2819 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2820 type->enumt.declaration = declaration;
2822 if (token.type == '{') {
2823 if (declaration->init.complete) {
2824 errorf(HERE, "multiple definitions of enum %Y", symbol);
2826 if (symbol != NULL) {
2827 environment_push(declaration);
2829 append_declaration(declaration);
2830 declaration->init.complete = true;
2832 parse_enum_entries(type);
2833 parse_attributes(&attributes);
2840 * if a symbol is a typedef to another type, return true
2842 static bool is_typedef_symbol(symbol_t *symbol)
2844 const declaration_t *const declaration =
2845 get_declaration(symbol, NAMESPACE_NORMAL);
2847 declaration != NULL &&
2848 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2851 static type_t *parse_typeof(void)
2858 add_anchor_token(')');
2860 expression_t *expression = NULL;
2863 switch(token.type) {
2864 case T___extension__:
2865 /* This can be a prefix to a typename or an expression. We simply eat
2869 } while (token.type == T___extension__);
2873 if (is_typedef_symbol(token.v.symbol)) {
2874 type = parse_typename();
2876 expression = parse_expression();
2877 type = expression->base.type;
2882 type = parse_typename();
2886 expression = parse_expression();
2887 type = expression->base.type;
2891 rem_anchor_token(')');
2894 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2895 typeof_type->typeoft.expression = expression;
2896 typeof_type->typeoft.typeof_type = type;
2903 typedef enum specifiers_t {
2904 SPECIFIER_SIGNED = 1 << 0,
2905 SPECIFIER_UNSIGNED = 1 << 1,
2906 SPECIFIER_LONG = 1 << 2,
2907 SPECIFIER_INT = 1 << 3,
2908 SPECIFIER_DOUBLE = 1 << 4,
2909 SPECIFIER_CHAR = 1 << 5,
2910 SPECIFIER_SHORT = 1 << 6,
2911 SPECIFIER_LONG_LONG = 1 << 7,
2912 SPECIFIER_FLOAT = 1 << 8,
2913 SPECIFIER_BOOL = 1 << 9,
2914 SPECIFIER_VOID = 1 << 10,
2915 SPECIFIER_INT8 = 1 << 11,
2916 SPECIFIER_INT16 = 1 << 12,
2917 SPECIFIER_INT32 = 1 << 13,
2918 SPECIFIER_INT64 = 1 << 14,
2919 SPECIFIER_INT128 = 1 << 15,
2920 SPECIFIER_COMPLEX = 1 << 16,
2921 SPECIFIER_IMAGINARY = 1 << 17,
2924 static type_t *create_builtin_type(symbol_t *const symbol,
2925 type_t *const real_type)
2927 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2928 type->builtin.symbol = symbol;
2929 type->builtin.real_type = real_type;
2931 type_t *result = typehash_insert(type);
2932 if (type != result) {
2939 static type_t *get_typedef_type(symbol_t *symbol)
2941 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2942 if (declaration == NULL ||
2943 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2946 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2947 type->typedeft.declaration = declaration;
2953 * check for the allowed MS alignment values.
2955 static bool check_alignment_value(long long intvalue)
2957 if (intvalue < 1 || intvalue > 8192) {
2958 errorf(HERE, "illegal alignment value");
2961 unsigned v = (unsigned)intvalue;
2962 for(unsigned i = 1; i <= 8192; i += i) {
2966 errorf(HERE, "alignment must be power of two");
2970 #define DET_MOD(name, tag) do { \
2971 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2972 *modifiers |= tag; \
2975 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2977 decl_modifiers_t *modifiers = &specifiers->modifiers;
2980 if (token.type == T_restrict) {
2982 DET_MOD(restrict, DM_RESTRICT);
2984 } else if (token.type != T_IDENTIFIER)
2986 symbol_t *symbol = token.v.symbol;
2987 if (symbol == sym_align) {
2990 if (token.type != T_INTEGER)
2992 if (check_alignment_value(token.v.intvalue)) {
2993 if (specifiers->alignment != 0)
2994 warningf(HERE, "align used more than once");
2995 specifiers->alignment = (unsigned char)token.v.intvalue;
2999 } else if (symbol == sym_allocate) {
3002 if (token.type != T_IDENTIFIER)
3004 (void)token.v.symbol;
3006 } else if (symbol == sym_dllimport) {
3008 DET_MOD(dllimport, DM_DLLIMPORT);
3009 } else if (symbol == sym_dllexport) {
3011 DET_MOD(dllexport, DM_DLLEXPORT);
3012 } else if (symbol == sym_thread) {
3014 DET_MOD(thread, DM_THREAD);
3015 } else if (symbol == sym_naked) {
3017 DET_MOD(naked, DM_NAKED);
3018 } else if (symbol == sym_noinline) {
3020 DET_MOD(noinline, DM_NOINLINE);
3021 } else if (symbol == sym_noreturn) {
3023 DET_MOD(noreturn, DM_NORETURN);
3024 } else if (symbol == sym_nothrow) {
3026 DET_MOD(nothrow, DM_NOTHROW);
3027 } else if (symbol == sym_novtable) {
3029 DET_MOD(novtable, DM_NOVTABLE);
3030 } else if (symbol == sym_property) {
3034 bool is_get = false;
3035 if (token.type != T_IDENTIFIER)
3037 if (token.v.symbol == sym_get) {
3039 } else if (token.v.symbol == sym_put) {
3041 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3046 if (token.type != T_IDENTIFIER)
3049 if (specifiers->get_property_sym != NULL) {
3050 errorf(HERE, "get property name already specified");
3052 specifiers->get_property_sym = token.v.symbol;
3055 if (specifiers->put_property_sym != NULL) {
3056 errorf(HERE, "put property name already specified");
3058 specifiers->put_property_sym = token.v.symbol;
3062 if (token.type == ',') {
3069 } else if (symbol == sym_selectany) {
3071 DET_MOD(selectany, DM_SELECTANY);
3072 } else if (symbol == sym_uuid) {
3075 if (token.type != T_STRING_LITERAL)
3079 } else if (symbol == sym_deprecated) {
3081 if (specifiers->deprecated != 0)
3082 warningf(HERE, "deprecated used more than once");
3083 specifiers->deprecated = 1;
3084 if (token.type == '(') {
3086 if (token.type == T_STRING_LITERAL) {
3087 specifiers->deprecated_string = token.v.string.begin;
3090 errorf(HERE, "string literal expected");
3094 } else if (symbol == sym_noalias) {
3096 DET_MOD(noalias, DM_NOALIAS);
3098 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3100 if (token.type == '(')
3104 if (token.type == ',')
3111 static declaration_t *create_error_declaration(symbol_t *symbol, storage_class_tag_t storage_class)
3113 declaration_t *const decl = allocate_declaration_zero();
3114 decl->source_position = *HERE;
3115 decl->declared_storage_class = storage_class;
3116 decl->storage_class =
3117 storage_class != STORAGE_CLASS_NONE || scope == global_scope ?
3118 storage_class : STORAGE_CLASS_AUTO;
3119 decl->symbol = symbol;
3120 decl->implicit = true;
3121 record_declaration(decl, false);
3126 * Finish the construction of a struct type by calculating
3127 * its size, offsets, alignment.
3129 static void finish_struct_type(compound_type_t *type) {
3130 if (type->declaration == NULL)
3132 declaration_t *struct_decl = type->declaration;
3133 if (! struct_decl->init.complete)
3138 il_alignment_t alignment = 1;
3139 bool need_pad = false;
3141 declaration_t *entry = struct_decl->scope.declarations;
3142 for (; entry != NULL; entry = entry->next) {
3143 if (entry->namespc != NAMESPACE_NORMAL)
3146 type_t *m_type = skip_typeref(entry->type);
3147 if (! is_type_valid(m_type)) {
3148 /* simply ignore errors here */
3151 il_alignment_t m_alignment = m_type->base.alignment;
3152 if (m_alignment > alignment)
3153 alignment = m_alignment;
3155 offset = (size + m_alignment - 1) & -m_alignment;
3159 entry->offset = offset;
3160 size = offset + m_type->base.size;
3162 if (type->base.alignment != 0) {
3163 alignment = type->base.alignment;
3166 offset = (size + alignment - 1) & -alignment;
3170 if (warning.padded && need_pad) {
3171 warningf(&struct_decl->source_position,
3172 "'%#T' needs padding", type, struct_decl->symbol);
3174 if (warning.packed && !need_pad) {
3175 warningf(&struct_decl->source_position,
3176 "superfluous packed attribute on '%#T'",
3177 type, struct_decl->symbol);
3180 type->base.size = offset;
3181 type->base.alignment = alignment;
3185 * Finish the construction of an union type by calculating
3186 * its size and alignment.
3188 static void finish_union_type(compound_type_t *type) {
3189 if (type->declaration == NULL)
3191 declaration_t *union_decl = type->declaration;
3192 if (! union_decl->init.complete)
3196 il_alignment_t alignment = 1;
3198 declaration_t *entry = union_decl->scope.declarations;
3199 for (; entry != NULL; entry = entry->next) {
3200 if (entry->namespc != NAMESPACE_NORMAL)
3203 type_t *m_type = skip_typeref(entry->type);
3204 if (! is_type_valid(m_type))
3208 if (m_type->base.size > size)
3209 size = m_type->base.size;
3210 if (m_type->base.alignment > alignment)
3211 alignment = m_type->base.alignment;
3213 if (type->base.alignment != 0) {
3214 alignment = type->base.alignment;
3216 size = (size + alignment - 1) & -alignment;
3217 type->base.size = size;
3218 type->base.alignment = alignment;
3221 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3223 type_t *type = NULL;
3224 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3225 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3226 unsigned type_specifiers = 0;
3227 bool newtype = false;
3228 bool saw_error = false;
3230 specifiers->source_position = token.source_position;
3233 specifiers->modifiers
3234 |= parse_attributes(&specifiers->gnu_attributes);
3235 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3236 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3238 switch(token.type) {
3241 #define MATCH_STORAGE_CLASS(token, class) \
3243 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3244 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3246 specifiers->declared_storage_class = class; \
3250 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3251 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3252 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3253 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3254 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3259 add_anchor_token(')');
3260 parse_microsoft_extended_decl_modifier(specifiers);
3261 rem_anchor_token(')');
3266 switch (specifiers->declared_storage_class) {
3267 case STORAGE_CLASS_NONE:
3268 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3271 case STORAGE_CLASS_EXTERN:
3272 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3275 case STORAGE_CLASS_STATIC:
3276 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3280 errorf(HERE, "multiple storage classes in declaration specifiers");
3286 /* type qualifiers */
3287 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3289 qualifiers |= qualifier; \
3293 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3294 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3295 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3296 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3297 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3298 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3299 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3300 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3302 case T___extension__:
3307 /* type specifiers */
3308 #define MATCH_SPECIFIER(token, specifier, name) \
3311 if (type_specifiers & specifier) { \
3312 errorf(HERE, "multiple " name " type specifiers given"); \
3314 type_specifiers |= specifier; \
3318 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3319 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3320 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3321 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3322 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3323 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3324 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3325 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3326 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3327 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3328 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3329 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3330 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3331 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3332 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3333 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3335 case T__forceinline:
3336 /* only in microsoft mode */
3337 specifiers->modifiers |= DM_FORCEINLINE;
3342 specifiers->is_inline = true;
3347 if (type_specifiers & SPECIFIER_LONG_LONG) {
3348 errorf(HERE, "multiple type specifiers given");
3349 } else if (type_specifiers & SPECIFIER_LONG) {
3350 type_specifiers |= SPECIFIER_LONG_LONG;
3352 type_specifiers |= SPECIFIER_LONG;
3357 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3359 type->compound.declaration = parse_compound_type_specifier(true);
3360 finish_struct_type(&type->compound);
3364 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3365 type->compound.declaration = parse_compound_type_specifier(false);
3366 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3367 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3369 finish_union_type(&type->compound);
3372 type = parse_enum_specifier();
3375 type = parse_typeof();
3377 case T___builtin_va_list:
3378 type = duplicate_type(type_valist);
3382 case T_IDENTIFIER: {
3383 /* only parse identifier if we haven't found a type yet */
3384 if (type != NULL || type_specifiers != 0) {
3385 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3386 * declaration, so it doesn't generate errors about expecting '(' or
3388 switch (look_ahead(1)->type) {
3395 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3398 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3403 goto finish_specifiers;
3407 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3408 if (typedef_type == NULL) {
3409 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3410 * declaration, so it doesn't generate 'implicit int' followed by more
3411 * errors later on. */
3412 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3417 errorf(HERE, "%K does not name a type", &token);
3419 declaration_t *const decl =
3420 create_error_declaration(token.v.symbol, STORAGE_CLASS_TYPEDEF);
3422 type = allocate_type_zero(TYPE_TYPEDEF, HERE);
3423 type->typedeft.declaration = decl;
3427 if (la1_type == '*')
3428 goto finish_specifiers;
3433 goto finish_specifiers;
3438 type = typedef_type;
3442 /* function specifier */
3444 goto finish_specifiers;
3449 if (type == NULL || (saw_error && type_specifiers != 0)) {
3450 atomic_type_kind_t atomic_type;
3452 /* match valid basic types */
3453 switch(type_specifiers) {
3454 case SPECIFIER_VOID:
3455 atomic_type = ATOMIC_TYPE_VOID;
3457 case SPECIFIER_CHAR:
3458 atomic_type = ATOMIC_TYPE_CHAR;
3460 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3461 atomic_type = ATOMIC_TYPE_SCHAR;
3463 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3464 atomic_type = ATOMIC_TYPE_UCHAR;
3466 case SPECIFIER_SHORT:
3467 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3468 case SPECIFIER_SHORT | SPECIFIER_INT:
3469 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3470 atomic_type = ATOMIC_TYPE_SHORT;
3472 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3473 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3474 atomic_type = ATOMIC_TYPE_USHORT;
3477 case SPECIFIER_SIGNED:
3478 case SPECIFIER_SIGNED | SPECIFIER_INT:
3479 atomic_type = ATOMIC_TYPE_INT;
3481 case SPECIFIER_UNSIGNED:
3482 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3483 atomic_type = ATOMIC_TYPE_UINT;
3485 case SPECIFIER_LONG:
3486 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3487 case SPECIFIER_LONG | SPECIFIER_INT:
3488 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3489 atomic_type = ATOMIC_TYPE_LONG;
3491 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3492 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3493 atomic_type = ATOMIC_TYPE_ULONG;
3496 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3497 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3498 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3499 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3501 atomic_type = ATOMIC_TYPE_LONGLONG;
3502 goto warn_about_long_long;
3504 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3505 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3507 atomic_type = ATOMIC_TYPE_ULONGLONG;
3508 warn_about_long_long:
3509 if (warning.long_long) {
3510 warningf(&specifiers->source_position,
3511 "ISO C90 does not support 'long long'");
3515 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3516 atomic_type = unsigned_int8_type_kind;
3519 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3520 atomic_type = unsigned_int16_type_kind;
3523 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3524 atomic_type = unsigned_int32_type_kind;
3527 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3528 atomic_type = unsigned_int64_type_kind;
3531 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3532 atomic_type = unsigned_int128_type_kind;
3535 case SPECIFIER_INT8:
3536 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3537 atomic_type = int8_type_kind;
3540 case SPECIFIER_INT16:
3541 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3542 atomic_type = int16_type_kind;
3545 case SPECIFIER_INT32:
3546 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3547 atomic_type = int32_type_kind;
3550 case SPECIFIER_INT64:
3551 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3552 atomic_type = int64_type_kind;
3555 case SPECIFIER_INT128:
3556 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3557 atomic_type = int128_type_kind;
3560 case SPECIFIER_FLOAT:
3561 atomic_type = ATOMIC_TYPE_FLOAT;
3563 case SPECIFIER_DOUBLE:
3564 atomic_type = ATOMIC_TYPE_DOUBLE;
3566 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3567 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3569 case SPECIFIER_BOOL:
3570 atomic_type = ATOMIC_TYPE_BOOL;
3572 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3573 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3574 atomic_type = ATOMIC_TYPE_FLOAT;
3576 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3577 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3578 atomic_type = ATOMIC_TYPE_DOUBLE;
3580 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3581 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3582 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3585 /* invalid specifier combination, give an error message */
3586 if (type_specifiers == 0) {
3588 specifiers->type = type_error_type;
3593 if (warning.implicit_int) {
3594 warningf(HERE, "no type specifiers in declaration, using 'int'");
3596 atomic_type = ATOMIC_TYPE_INT;
3599 errorf(HERE, "no type specifiers given in declaration");
3601 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3602 (type_specifiers & SPECIFIER_UNSIGNED)) {
3603 errorf(HERE, "signed and unsigned specifiers given");
3604 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3605 errorf(HERE, "only integer types can be signed or unsigned");
3607 errorf(HERE, "multiple datatypes in declaration");
3609 atomic_type = ATOMIC_TYPE_INVALID;
3612 if (type_specifiers & SPECIFIER_COMPLEX &&
3613 atomic_type != ATOMIC_TYPE_INVALID) {
3614 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3615 type->complex.akind = atomic_type;
3616 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3617 atomic_type != ATOMIC_TYPE_INVALID) {
3618 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3619 type->imaginary.akind = atomic_type;
3621 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3622 type->atomic.akind = atomic_type;
3625 } else if (type_specifiers != 0) {
3626 errorf(HERE, "multiple datatypes in declaration");
3629 /* FIXME: check type qualifiers here */
3631 type->base.qualifiers = qualifiers;
3632 type->base.modifiers = modifiers;
3634 type_t *result = typehash_insert(type);
3635 if (newtype && result != type) {
3639 specifiers->type = result;
3644 static type_qualifiers_t parse_type_qualifiers(void)
3646 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3649 switch(token.type) {
3650 /* type qualifiers */
3651 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3652 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3653 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3654 /* microsoft extended type modifiers */
3655 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3656 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3657 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3658 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3659 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3667 static declaration_t *parse_identifier_list(void)
3669 declaration_t *declarations = NULL;
3670 declaration_t *last_declaration = NULL;
3672 declaration_t *const declaration = allocate_declaration_zero();
3673 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3674 declaration->source_position = token.source_position;
3675 declaration->symbol = token.v.symbol;
3678 if (last_declaration != NULL) {
3679 last_declaration->next = declaration;
3681 declarations = declaration;
3683 last_declaration = declaration;
3685 if (token.type != ',') {
3689 } while (token.type == T_IDENTIFIER);
3691 return declarations;
3694 static type_t *automatic_type_conversion(type_t *orig_type);
3696 static void semantic_parameter(declaration_t *declaration)
3698 /* TODO: improve error messages */
3699 source_position_t const* const pos = &declaration->source_position;
3701 switch (declaration->declared_storage_class) {
3702 case STORAGE_CLASS_TYPEDEF:
3703 errorf(pos, "typedef not allowed in parameter list");
3706 /* Allowed storage classes */
3707 case STORAGE_CLASS_NONE:
3708 case STORAGE_CLASS_REGISTER:
3712 errorf(pos, "parameter may only have none or register storage class");
3716 type_t *const orig_type = declaration->type;
3717 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3718 * sugar. Turn it into a pointer.
3719 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3720 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3722 type_t *const type = automatic_type_conversion(orig_type);
3723 declaration->type = type;
3725 if (is_type_incomplete(skip_typeref(type))) {
3726 errorf(pos, "parameter '%#T' is of incomplete type",
3727 orig_type, declaration->symbol);
3731 static declaration_t *parse_parameter(void)
3733 declaration_specifiers_t specifiers;
3734 memset(&specifiers, 0, sizeof(specifiers));
3736 parse_declaration_specifiers(&specifiers);
3738 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3743 static declaration_t *parse_parameters(function_type_t *type)
3745 declaration_t *declarations = NULL;
3748 add_anchor_token(')');
3749 int saved_comma_state = save_and_reset_anchor_state(',');
3751 if (token.type == T_IDENTIFIER &&
3752 !is_typedef_symbol(token.v.symbol)) {
3753 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3754 if (la1_type == ',' || la1_type == ')') {
3755 type->kr_style_parameters = true;
3756 declarations = parse_identifier_list();
3757 goto parameters_finished;
3761 if (token.type == ')') {
3762 type->unspecified_parameters = 1;
3763 goto parameters_finished;
3766 declaration_t *declaration;
3767 declaration_t *last_declaration = NULL;
3768 function_parameter_t *parameter;
3769 function_parameter_t *last_parameter = NULL;
3772 switch(token.type) {
3776 goto parameters_finished;
3779 case T___extension__:
3781 declaration = parse_parameter();
3783 /* func(void) is not a parameter */
3784 if (last_parameter == NULL
3785 && token.type == ')'
3786 && declaration->symbol == NULL
3787 && skip_typeref(declaration->type) == type_void) {
3788 goto parameters_finished;
3790 semantic_parameter(declaration);
3792 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3793 memset(parameter, 0, sizeof(parameter[0]));
3794 parameter->type = declaration->type;
3796 if (last_parameter != NULL) {
3797 last_declaration->next = declaration;
3798 last_parameter->next = parameter;
3800 type->parameters = parameter;
3801 declarations = declaration;
3803 last_parameter = parameter;
3804 last_declaration = declaration;
3808 goto parameters_finished;
3810 if (token.type != ',') {
3811 goto parameters_finished;
3817 parameters_finished:
3818 rem_anchor_token(')');
3821 restore_anchor_state(',', saved_comma_state);
3822 return declarations;
3825 restore_anchor_state(',', saved_comma_state);
3829 typedef enum construct_type_kind_t {
3834 } construct_type_kind_t;
3836 typedef struct construct_type_t construct_type_t;
3837 struct construct_type_t {
3838 construct_type_kind_t kind;
3839 construct_type_t *next;
3842 typedef struct parsed_pointer_t parsed_pointer_t;
3843 struct parsed_pointer_t {
3844 construct_type_t construct_type;
3845 type_qualifiers_t type_qualifiers;
3848 typedef struct construct_function_type_t construct_function_type_t;
3849 struct construct_function_type_t {
3850 construct_type_t construct_type;
3851 type_t *function_type;
3854 typedef struct parsed_array_t parsed_array_t;
3855 struct parsed_array_t {
3856 construct_type_t construct_type;
3857 type_qualifiers_t type_qualifiers;
3863 typedef struct construct_base_type_t construct_base_type_t;
3864 struct construct_base_type_t {
3865 construct_type_t construct_type;
3869 static construct_type_t *parse_pointer_declarator(void)
3873 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3874 memset(pointer, 0, sizeof(pointer[0]));
3875 pointer->construct_type.kind = CONSTRUCT_POINTER;
3876 pointer->type_qualifiers = parse_type_qualifiers();
3878 return (construct_type_t*) pointer;
3881 static construct_type_t *parse_array_declarator(void)
3884 add_anchor_token(']');
3886 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3887 memset(array, 0, sizeof(array[0]));
3888 array->construct_type.kind = CONSTRUCT_ARRAY;
3890 if (token.type == T_static) {
3891 array->is_static = true;
3895 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3896 if (type_qualifiers != 0) {
3897 if (token.type == T_static) {
3898 array->is_static = true;
3902 array->type_qualifiers = type_qualifiers;
3904 if (token.type == '*' && look_ahead(1)->type == ']') {
3905 array->is_variable = true;
3907 } else if (token.type != ']') {
3908 array->size = parse_assignment_expression();
3911 rem_anchor_token(']');
3914 return (construct_type_t*) array;
3919 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3922 if (declaration != NULL) {
3923 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3925 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3927 if (mask & (mask-1)) {
3928 const char *first = NULL, *second = NULL;
3930 /* more than one calling convention set */
3931 if (declaration->modifiers & DM_CDECL) {
3932 if (first == NULL) first = "cdecl";
3933 else if (second == NULL) second = "cdecl";
3935 if (declaration->modifiers & DM_STDCALL) {
3936 if (first == NULL) first = "stdcall";
3937 else if (second == NULL) second = "stdcall";
3939 if (declaration->modifiers & DM_FASTCALL) {
3940 if (first == NULL) first = "fastcall";
3941 else if (second == NULL) second = "fastcall";
3943 if (declaration->modifiers & DM_THISCALL) {
3944 if (first == NULL) first = "thiscall";
3945 else if (second == NULL) second = "thiscall";
3947 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3950 if (declaration->modifiers & DM_CDECL)
3951 type->function.calling_convention = CC_CDECL;
3952 else if (declaration->modifiers & DM_STDCALL)
3953 type->function.calling_convention = CC_STDCALL;
3954 else if (declaration->modifiers & DM_FASTCALL)
3955 type->function.calling_convention = CC_FASTCALL;
3956 else if (declaration->modifiers & DM_THISCALL)
3957 type->function.calling_convention = CC_THISCALL;
3959 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3962 declaration_t *parameters = parse_parameters(&type->function);
3963 if (declaration != NULL) {
3964 declaration->scope.declarations = parameters;
3967 construct_function_type_t *construct_function_type =
3968 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3969 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3970 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3971 construct_function_type->function_type = type;
3973 return &construct_function_type->construct_type;
3976 static void fix_declaration_type(declaration_t *declaration)
3978 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3979 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3981 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3982 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3984 if (declaration->type->base.modifiers == type_modifiers)
3987 type_t *copy = duplicate_type(declaration->type);
3988 copy->base.modifiers = type_modifiers;
3990 type_t *result = typehash_insert(copy);
3991 if (result != copy) {
3992 obstack_free(type_obst, copy);
3995 declaration->type = result;
3998 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3999 bool may_be_abstract)
4001 /* construct a single linked list of construct_type_t's which describe
4002 * how to construct the final declarator type */
4003 construct_type_t *first = NULL;
4004 construct_type_t *last = NULL;
4005 gnu_attribute_t *attributes = NULL;
4007 decl_modifiers_t modifiers = parse_attributes(&attributes);
4010 while (token.type == '*') {
4011 construct_type_t *type = parse_pointer_declarator();
4021 /* TODO: find out if this is correct */
4022 modifiers |= parse_attributes(&attributes);
4025 if (declaration != NULL)
4026 declaration->modifiers |= modifiers;
4028 construct_type_t *inner_types = NULL;
4030 switch(token.type) {
4032 if (declaration == NULL) {
4033 errorf(HERE, "no identifier expected in typename");
4035 declaration->symbol = token.v.symbol;
4036 declaration->source_position = token.source_position;
4042 add_anchor_token(')');
4043 inner_types = parse_inner_declarator(declaration, may_be_abstract);
4044 if (inner_types != NULL) {
4045 /* All later declarators only modify the return type, not declaration */
4048 rem_anchor_token(')');
4052 if (may_be_abstract)
4054 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4055 /* avoid a loop in the outermost scope, because eat_statement doesn't
4057 if (token.type == '}' && current_function == NULL) {
4065 construct_type_t *p = last;
4068 construct_type_t *type;
4069 switch(token.type) {
4071 type = parse_function_declarator(declaration);
4074 type = parse_array_declarator();
4077 goto declarator_finished;
4080 /* insert in the middle of the list (behind p) */
4082 type->next = p->next;
4093 declarator_finished:
4094 /* append inner_types at the end of the list, we don't to set last anymore
4095 * as it's not needed anymore */
4097 assert(first == NULL);
4098 first = inner_types;
4100 last->next = inner_types;
4108 static void parse_declaration_attributes(declaration_t *declaration)
4110 gnu_attribute_t *attributes = NULL;
4111 decl_modifiers_t modifiers = parse_attributes(&attributes);
4113 if (declaration == NULL)
4116 declaration->modifiers |= modifiers;
4117 /* check if we have these stupid mode attributes... */
4118 type_t *old_type = declaration->type;
4119 if (old_type == NULL)
4122 gnu_attribute_t *attribute = attributes;
4123 for ( ; attribute != NULL; attribute = attribute->next) {
4124 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4127 atomic_type_kind_t akind = attribute->u.akind;
4128 if (!is_type_signed(old_type)) {
4130 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4131 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4132 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4133 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4135 panic("invalid akind in mode attribute");
4139 = make_atomic_type(akind, old_type->base.qualifiers);
4143 static type_t *construct_declarator_type(construct_type_t *construct_list,
4146 construct_type_t *iter = construct_list;
4147 for( ; iter != NULL; iter = iter->next) {
4148 switch(iter->kind) {
4149 case CONSTRUCT_INVALID:
4150 internal_errorf(HERE, "invalid type construction found");
4151 case CONSTRUCT_FUNCTION: {
4152 construct_function_type_t *construct_function_type
4153 = (construct_function_type_t*) iter;
4155 type_t *function_type = construct_function_type->function_type;
4157 function_type->function.return_type = type;
4159 type_t *skipped_return_type = skip_typeref(type);
4160 if (is_type_function(skipped_return_type)) {
4161 errorf(HERE, "function returning function is not allowed");
4162 type = type_error_type;
4163 } else if (is_type_array(skipped_return_type)) {
4164 errorf(HERE, "function returning array is not allowed");
4165 type = type_error_type;
4167 type = function_type;
4172 case CONSTRUCT_POINTER: {
4173 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4174 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
4175 pointer_type->pointer.points_to = type;
4176 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
4178 type = pointer_type;
4182 case CONSTRUCT_ARRAY: {
4183 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4184 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
4186 expression_t *size_expression = parsed_array->size;
4187 if (size_expression != NULL) {
4189 = create_implicit_cast(size_expression, type_size_t);
4192 array_type->base.qualifiers = parsed_array->type_qualifiers;
4193 array_type->array.element_type = type;
4194 array_type->array.is_static = parsed_array->is_static;
4195 array_type->array.is_variable = parsed_array->is_variable;
4196 array_type->array.size_expression = size_expression;
4198 if (size_expression != NULL) {
4199 if (is_constant_expression(size_expression)) {
4200 array_type->array.size_constant = true;
4201 array_type->array.size
4202 = fold_constant(size_expression);
4204 array_type->array.is_vla = true;
4208 type_t *skipped_type = skip_typeref(type);
4209 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
4210 errorf(HERE, "array of void is not allowed");
4211 type = type_error_type;
4219 type_t *hashed_type = typehash_insert(type);
4220 if (hashed_type != type) {
4221 /* the function type was constructed earlier freeing it here will
4222 * destroy other types... */
4223 if (iter->kind != CONSTRUCT_FUNCTION) {
4233 static declaration_t *parse_declarator(
4234 const declaration_specifiers_t *specifiers, bool may_be_abstract)
4236 declaration_t *const declaration = allocate_declaration_zero();
4237 declaration->source_position = specifiers->source_position;
4238 declaration->declared_storage_class = specifiers->declared_storage_class;
4239 declaration->modifiers = specifiers->modifiers;
4240 declaration->deprecated_string = specifiers->deprecated_string;
4241 declaration->get_property_sym = specifiers->get_property_sym;
4242 declaration->put_property_sym = specifiers->put_property_sym;
4243 declaration->is_inline = specifiers->is_inline;
4245 declaration->storage_class = specifiers->declared_storage_class;
4246 if (declaration->storage_class == STORAGE_CLASS_NONE
4247 && scope != global_scope) {
4248 declaration->storage_class = STORAGE_CLASS_AUTO;
4251 if (specifiers->alignment != 0) {
4252 /* TODO: add checks here */
4253 declaration->alignment = specifiers->alignment;
4256 construct_type_t *construct_type
4257 = parse_inner_declarator(declaration, may_be_abstract);
4258 type_t *const type = specifiers->type;
4259 declaration->type = construct_declarator_type(construct_type, type);
4261 parse_declaration_attributes(declaration);
4263 fix_declaration_type(declaration);
4265 if (construct_type != NULL) {
4266 obstack_free(&temp_obst, construct_type);
4272 static type_t *parse_abstract_declarator(type_t *base_type)
4274 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4276 type_t *result = construct_declarator_type(construct_type, base_type);
4277 if (construct_type != NULL) {
4278 obstack_free(&temp_obst, construct_type);
4284 static declaration_t *append_declaration(declaration_t* const declaration)
4286 if (last_declaration != NULL) {
4287 last_declaration->next = declaration;
4289 scope->declarations = declaration;
4291 last_declaration = declaration;
4296 * Check if the declaration of main is suspicious. main should be a
4297 * function with external linkage, returning int, taking either zero
4298 * arguments, two, or three arguments of appropriate types, ie.
4300 * int main([ int argc, char **argv [, char **env ] ]).
4302 * @param decl the declaration to check
4303 * @param type the function type of the declaration
4305 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4307 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4308 warningf(&decl->source_position,
4309 "'main' is normally a non-static function");
4311 if (skip_typeref(func_type->return_type) != type_int) {
4312 warningf(&decl->source_position,
4313 "return type of 'main' should be 'int', but is '%T'",
4314 func_type->return_type);
4316 const function_parameter_t *parm = func_type->parameters;
4318 type_t *const first_type = parm->type;
4319 if (!types_compatible(skip_typeref(first_type), type_int)) {
4320 warningf(&decl->source_position,
4321 "first argument of 'main' should be 'int', but is '%T'", first_type);
4325 type_t *const second_type = parm->type;
4326 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4327 warningf(&decl->source_position,
4328 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4332 type_t *const third_type = parm->type;
4333 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4334 warningf(&decl->source_position,
4335 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4339 goto warn_arg_count;
4343 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4349 * Check if a symbol is the equal to "main".
4351 static bool is_sym_main(const symbol_t *const sym)
4353 return strcmp(sym->string, "main") == 0;
4356 static declaration_t *record_declaration(
4357 declaration_t *const declaration,
4358 const bool is_definition)
4360 const symbol_t *const symbol = declaration->symbol;
4361 const namespace_t namespc = (namespace_t)declaration->namespc;
4363 assert(symbol != NULL);
4364 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4366 type_t *const orig_type = declaration->type;
4367 type_t *const type = skip_typeref(orig_type);
4368 if (is_type_function(type) &&
4369 type->function.unspecified_parameters &&
4370 warning.strict_prototypes &&
4371 previous_declaration == NULL) {
4372 warningf(&declaration->source_position,
4373 "function declaration '%#T' is not a prototype",
4374 orig_type, declaration->symbol);
4377 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4378 check_type_of_main(declaration, &type->function);
4381 if (warning.nested_externs &&
4382 declaration->storage_class == STORAGE_CLASS_EXTERN &&
4383 scope != global_scope) {
4384 warningf(&declaration->source_position,
4385 "nested extern declaration of '%#T'", declaration->type, symbol);
4388 assert(declaration != previous_declaration);
4389 if (previous_declaration != NULL
4390 && previous_declaration->parent_scope == scope) {
4391 /* can happen for K&R style declarations */
4392 if (previous_declaration->type == NULL) {
4393 previous_declaration->type = declaration->type;
4396 const type_t *prev_type = skip_typeref(previous_declaration->type);
4397 if (!types_compatible(type, prev_type)) {
4398 errorf(&declaration->source_position,
4399 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4400 orig_type, symbol, previous_declaration->type, symbol,
4401 &previous_declaration->source_position);
4403 unsigned old_storage_class = previous_declaration->storage_class;
4404 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4405 errorf(&declaration->source_position,
4406 "redeclaration of enum entry '%Y' (declared %P)",
4407 symbol, &previous_declaration->source_position);
4408 return previous_declaration;
4411 if (warning.redundant_decls &&
4413 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4414 !(previous_declaration->modifiers & DM_USED) &&
4415 !previous_declaration->used) {
4416 warningf(&previous_declaration->source_position,
4417 "unnecessary static forward declaration for '%#T'",
4418 previous_declaration->type, symbol);
4421 unsigned new_storage_class = declaration->storage_class;
4423 if (is_type_incomplete(prev_type)) {
4424 previous_declaration->type = type;
4428 /* pretend no storage class means extern for function
4429 * declarations (except if the previous declaration is neither
4430 * none nor extern) */
4431 if (is_type_function(type)) {
4432 if (prev_type->function.unspecified_parameters) {
4433 previous_declaration->type = type;
4437 switch (old_storage_class) {
4438 case STORAGE_CLASS_NONE:
4439 old_storage_class = STORAGE_CLASS_EXTERN;
4442 case STORAGE_CLASS_EXTERN:
4443 if (is_definition) {
4444 if (warning.missing_prototypes &&
4445 prev_type->function.unspecified_parameters &&
4446 !is_sym_main(symbol)) {
4447 warningf(&declaration->source_position,
4448 "no previous prototype for '%#T'",
4451 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4452 new_storage_class = STORAGE_CLASS_EXTERN;
4461 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4462 new_storage_class == STORAGE_CLASS_EXTERN) {
4463 warn_redundant_declaration:
4464 if (!is_definition &&
4465 warning.redundant_decls &&
4466 is_type_valid(prev_type) &&
4467 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4468 warningf(&declaration->source_position,
4469 "redundant declaration for '%Y' (declared %P)",
4470 symbol, &previous_declaration->source_position);
4472 } else if (current_function == NULL) {
4473 if (old_storage_class != STORAGE_CLASS_STATIC &&
4474 new_storage_class == STORAGE_CLASS_STATIC) {
4475 errorf(&declaration->source_position,
4476 "static declaration of '%Y' follows non-static declaration (declared %P)",
4477 symbol, &previous_declaration->source_position);
4478 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4479 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4480 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4482 goto warn_redundant_declaration;
4484 } else if (is_type_valid(prev_type)) {
4485 if (old_storage_class == new_storage_class) {
4486 errorf(&declaration->source_position,
4487 "redeclaration of '%Y' (declared %P)",
4488 symbol, &previous_declaration->source_position);
4490 errorf(&declaration->source_position,
4491 "redeclaration of '%Y' with different linkage (declared %P)",
4492 symbol, &previous_declaration->source_position);
4497 previous_declaration->modifiers |= declaration->modifiers;
4498 previous_declaration->is_inline |= declaration->is_inline;
4499 return previous_declaration;
4500 } else if (is_type_function(type)) {
4501 if (is_definition &&
4502 declaration->storage_class != STORAGE_CLASS_STATIC) {
4503 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4504 warningf(&declaration->source_position,
4505 "no previous prototype for '%#T'", orig_type, symbol);
4506 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4507 warningf(&declaration->source_position,
4508 "no previous declaration for '%#T'", orig_type,
4513 if (warning.missing_declarations &&
4514 scope == global_scope && (
4515 declaration->storage_class == STORAGE_CLASS_NONE ||
4516 declaration->storage_class == STORAGE_CLASS_THREAD
4518 warningf(&declaration->source_position,
4519 "no previous declaration for '%#T'", orig_type, symbol);
4523 assert(declaration->parent_scope == NULL);
4524 assert(scope != NULL);
4526 declaration->parent_scope = scope;
4528 environment_push(declaration);
4529 return append_declaration(declaration);
4532 static void parser_error_multiple_definition(declaration_t *declaration,
4533 const source_position_t *source_position)
4535 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4536 declaration->symbol, &declaration->source_position);
4539 static bool is_declaration_specifier(const token_t *token,
4540 bool only_specifiers_qualifiers)
4542 switch(token->type) {
4547 return is_typedef_symbol(token->v.symbol);
4549 case T___extension__:
4551 return !only_specifiers_qualifiers;
4558 static void parse_init_declarator_rest(declaration_t *declaration)
4562 type_t *orig_type = declaration->type;
4563 type_t *type = skip_typeref(orig_type);
4565 if (declaration->init.initializer != NULL) {
4566 parser_error_multiple_definition(declaration, HERE);
4569 bool must_be_constant = false;
4570 if (declaration->storage_class == STORAGE_CLASS_STATIC
4571 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4572 || declaration->parent_scope == global_scope) {
4573 must_be_constant = true;
4576 if (is_type_function(type)) {
4577 errorf(&declaration->source_position,
4578 "function '%#T' is initialized like a variable",
4579 orig_type, declaration->symbol);
4580 orig_type = type_error_type;
4583 parse_initializer_env_t env;
4584 env.type = orig_type;
4585 env.must_be_constant = must_be_constant;
4586 env.declaration = current_init_decl = declaration;
4588 initializer_t *initializer = parse_initializer(&env);
4589 current_init_decl = NULL;
4591 if (!is_type_function(type)) {
4592 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
4593 * the array type size */
4594 declaration->type = env.type;
4595 declaration->init.initializer = initializer;
4599 /* parse rest of a declaration without any declarator */
4600 static void parse_anonymous_declaration_rest(
4601 const declaration_specifiers_t *specifiers)
4605 declaration_t *const declaration = allocate_declaration_zero();
4606 declaration->type = specifiers->type;
4607 declaration->declared_storage_class = specifiers->declared_storage_class;
4608 declaration->source_position = specifiers->source_position;
4609 declaration->modifiers = specifiers->modifiers;
4611 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4612 warningf(&declaration->source_position,
4613 "useless storage class in empty declaration");
4615 declaration->storage_class = STORAGE_CLASS_NONE;
4617 type_t *type = declaration->type;
4618 switch (type->kind) {
4619 case TYPE_COMPOUND_STRUCT:
4620 case TYPE_COMPOUND_UNION: {
4621 if (type->compound.declaration->symbol == NULL) {
4622 warningf(&declaration->source_position,
4623 "unnamed struct/union that defines no instances");
4632 warningf(&declaration->source_position, "empty declaration");
4636 append_declaration(declaration);
4639 static void parse_declaration_rest(declaration_t *ndeclaration,
4640 const declaration_specifiers_t *specifiers,
4641 parsed_declaration_func finished_declaration)
4643 add_anchor_token(';');
4644 add_anchor_token('=');
4645 add_anchor_token(',');
4647 declaration_t *declaration =
4648 finished_declaration(ndeclaration, token.type == '=');
4650 type_t *orig_type = declaration->type;
4651 type_t *type = skip_typeref(orig_type);
4653 if (type->kind != TYPE_FUNCTION &&
4654 declaration->is_inline &&
4655 is_type_valid(type)) {
4656 warningf(&declaration->source_position,
4657 "variable '%Y' declared 'inline'\n", declaration->symbol);
4660 if (token.type == '=') {
4661 parse_init_declarator_rest(declaration);
4664 if (token.type != ',')
4668 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4673 rem_anchor_token(';');
4674 rem_anchor_token('=');
4675 rem_anchor_token(',');
4678 static declaration_t *finished_kr_declaration(declaration_t *declaration, bool is_definition)
4680 symbol_t *symbol = declaration->symbol;
4681 if (symbol == NULL) {
4682 errorf(HERE, "anonymous declaration not valid as function parameter");
4685 namespace_t namespc = (namespace_t) declaration->namespc;
4686 if (namespc != NAMESPACE_NORMAL) {
4687 return record_declaration(declaration, false);
4690 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4691 if (previous_declaration == NULL ||
4692 previous_declaration->parent_scope != scope) {
4693 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4698 if (is_definition) {
4699 errorf(HERE, "parameter %Y is initialised", declaration->symbol);
4702 if (previous_declaration->type == NULL) {
4703 previous_declaration->type = declaration->type;
4704 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4705 previous_declaration->storage_class = declaration->storage_class;
4706 previous_declaration->parent_scope = scope;
4707 return previous_declaration;
4709 return record_declaration(declaration, false);
4713 static void parse_declaration(parsed_declaration_func finished_declaration)
4715 declaration_specifiers_t specifiers;
4716 memset(&specifiers, 0, sizeof(specifiers));
4717 parse_declaration_specifiers(&specifiers);
4719 if (token.type == ';') {
4720 parse_anonymous_declaration_rest(&specifiers);
4722 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4723 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4727 static type_t *get_default_promoted_type(type_t *orig_type)
4729 type_t *result = orig_type;
4731 type_t *type = skip_typeref(orig_type);
4732 if (is_type_integer(type)) {
4733 result = promote_integer(type);
4734 } else if (type == type_float) {
4735 result = type_double;
4741 static void parse_kr_declaration_list(declaration_t *declaration)
4743 type_t *type = skip_typeref(declaration->type);
4744 if (!is_type_function(type))
4747 if (!type->function.kr_style_parameters)
4750 /* push function parameters */
4751 int top = environment_top();
4752 scope_t *last_scope = scope;
4753 set_scope(&declaration->scope);
4755 declaration_t *parameter = declaration->scope.declarations;
4756 for ( ; parameter != NULL; parameter = parameter->next) {
4757 assert(parameter->parent_scope == NULL);
4758 parameter->parent_scope = scope;
4759 environment_push(parameter);
4762 /* parse declaration list */
4763 while (is_declaration_specifier(&token, false)) {
4764 parse_declaration(finished_kr_declaration);
4767 /* pop function parameters */
4768 assert(scope == &declaration->scope);
4769 set_scope(last_scope);
4770 environment_pop_to(top);
4772 /* update function type */
4773 type_t *new_type = duplicate_type(type);
4775 function_parameter_t *parameters = NULL;
4776 function_parameter_t *last_parameter = NULL;
4778 declaration_t *parameter_declaration = declaration->scope.declarations;
4779 for( ; parameter_declaration != NULL;
4780 parameter_declaration = parameter_declaration->next) {
4781 type_t *parameter_type = parameter_declaration->type;
4782 if (parameter_type == NULL) {
4784 errorf(HERE, "no type specified for function parameter '%Y'",
4785 parameter_declaration->symbol);
4787 if (warning.implicit_int) {
4788 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4789 parameter_declaration->symbol);
4791 parameter_type = type_int;
4792 parameter_declaration->type = parameter_type;
4796 semantic_parameter(parameter_declaration);
4797 parameter_type = parameter_declaration->type;
4800 * we need the default promoted types for the function type
4802 parameter_type = get_default_promoted_type(parameter_type);
4804 function_parameter_t *function_parameter
4805 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4806 memset(function_parameter, 0, sizeof(function_parameter[0]));
4808 function_parameter->type = parameter_type;
4809 if (last_parameter != NULL) {
4810 last_parameter->next = function_parameter;
4812 parameters = function_parameter;
4814 last_parameter = function_parameter;
4817 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4819 new_type->function.parameters = parameters;
4820 new_type->function.unspecified_parameters = true;
4822 type = typehash_insert(new_type);
4823 if (type != new_type) {
4824 obstack_free(type_obst, new_type);
4827 declaration->type = type;
4830 static bool first_err = true;
4833 * When called with first_err set, prints the name of the current function,
4836 static void print_in_function(void)
4840 diagnosticf("%s: In function '%Y':\n",
4841 current_function->source_position.input_name,
4842 current_function->symbol);
4847 * Check if all labels are defined in the current function.
4848 * Check if all labels are used in the current function.
4850 static void check_labels(void)
4852 for (const goto_statement_t *goto_statement = goto_first;
4853 goto_statement != NULL;
4854 goto_statement = goto_statement->next) {
4855 /* skip computed gotos */
4856 if (goto_statement->expression != NULL)
4859 declaration_t *label = goto_statement->label;
4862 if (label->source_position.input_name == NULL) {
4863 print_in_function();
4864 errorf(&goto_statement->base.source_position,
4865 "label '%Y' used but not defined", label->symbol);
4868 goto_first = goto_last = NULL;
4870 if (warning.unused_label) {
4871 for (const label_statement_t *label_statement = label_first;
4872 label_statement != NULL;
4873 label_statement = label_statement->next) {
4874 const declaration_t *label = label_statement->label;
4876 if (! label->used) {
4877 print_in_function();
4878 warningf(&label_statement->base.source_position,
4879 "label '%Y' defined but not used", label->symbol);
4883 label_first = label_last = NULL;
4887 * Check declarations of current_function for unused entities.
4889 static void check_declarations(void)
4891 if (warning.unused_parameter) {
4892 const scope_t *scope = ¤t_function->scope;
4894 if (is_sym_main(current_function->symbol)) {
4895 /* do not issue unused warnings for main */
4898 const declaration_t *parameter = scope->declarations;
4899 for (; parameter != NULL; parameter = parameter->next) {
4900 if (! parameter->used) {
4901 print_in_function();
4902 warningf(¶meter->source_position,
4903 "unused parameter '%Y'", parameter->symbol);
4907 if (warning.unused_variable) {
4911 static int determine_truth(expression_t const* const cond)
4914 !is_constant_expression(cond) ? 0 :
4915 fold_constant(cond) != 0 ? 1 :
4919 static bool noreturn_candidate;
4921 static void check_reachable(statement_t *const stmt)
4923 if (stmt->base.reachable)
4925 if (stmt->kind != STATEMENT_DO_WHILE)
4926 stmt->base.reachable = true;
4928 statement_t *last = stmt;
4930 switch (stmt->kind) {
4931 case STATEMENT_INVALID:
4932 case STATEMENT_EMPTY:
4933 case STATEMENT_DECLARATION:
4935 next = stmt->base.next;
4938 case STATEMENT_COMPOUND:
4939 next = stmt->compound.statements;
4942 case STATEMENT_RETURN:
4943 noreturn_candidate = false;
4946 case STATEMENT_IF: {
4947 if_statement_t const* const ifs = &stmt->ifs;
4948 int const val = determine_truth(ifs->condition);
4951 check_reachable(ifs->true_statement);
4956 if (ifs->false_statement != NULL) {
4957 check_reachable(ifs->false_statement);
4961 next = stmt->base.next;
4965 case STATEMENT_SWITCH: {
4966 switch_statement_t const *const switchs = &stmt->switchs;
4967 expression_t const *const expr = switchs->expression;
4969 if (is_constant_expression(expr)) {
4970 long const val = fold_constant(expr);
4971 case_label_statement_t * defaults = NULL;
4972 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4973 if (i->expression == NULL) {
4978 if (i->first_case <= val && val <= i->last_case) {
4979 check_reachable((statement_t*)i);
4984 if (defaults != NULL) {
4985 check_reachable((statement_t*)defaults);
4989 bool has_default = false;
4990 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4991 if (i->expression == NULL)
4994 check_reachable((statement_t*)i);
5001 next = stmt->base.next;
5005 case STATEMENT_EXPRESSION: {
5006 /* Check for noreturn function call */
5007 expression_t const *const expr = stmt->expression.expression;
5008 if (expr->kind == EXPR_CALL) {
5009 expression_t const *const func = expr->call.function;
5010 if (func->kind == EXPR_REFERENCE) {
5011 declaration_t const *const decl = func->reference.declaration;
5012 if (decl != NULL && decl->modifiers & DM_NORETURN) {
5018 next = stmt->base.next;
5022 case STATEMENT_CONTINUE: {
5023 statement_t *parent = stmt;
5025 parent = parent->base.parent;
5026 if (parent == NULL) /* continue not within loop */
5030 switch (parent->kind) {
5031 case STATEMENT_WHILE: goto continue_while;
5032 case STATEMENT_DO_WHILE: goto continue_do_while;
5033 case STATEMENT_FOR: goto continue_for;
5040 case STATEMENT_BREAK: {
5041 statement_t *parent = stmt;
5043 parent = parent->base.parent;
5044 if (parent == NULL) /* break not within loop/switch */
5047 switch (parent->kind) {
5048 case STATEMENT_SWITCH:
5049 case STATEMENT_WHILE:
5050 case STATEMENT_DO_WHILE:
5053 next = parent->base.next;
5054 goto found_break_parent;
5063 case STATEMENT_GOTO:
5064 if (stmt->gotos.expression) {
5065 statement_t *parent = stmt->base.parent;
5066 if (parent == NULL) /* top level goto */
5070 next = stmt->gotos.label->init.statement;
5071 if (next == NULL) /* missing label */
5076 case STATEMENT_LABEL:
5077 next = stmt->label.statement;
5080 case STATEMENT_CASE_LABEL:
5081 next = stmt->case_label.statement;
5084 case STATEMENT_WHILE: {
5085 while_statement_t const *const whiles = &stmt->whiles;
5086 int const val = determine_truth(whiles->condition);
5089 check_reachable(whiles->body);
5094 next = stmt->base.next;
5098 case STATEMENT_DO_WHILE:
5099 next = stmt->do_while.body;
5102 case STATEMENT_FOR: {
5103 for_statement_t *const fors = &stmt->fors;
5105 if (fors->condition_reachable)
5107 fors->condition_reachable = true;
5109 expression_t const *const cond = fors->condition;
5111 cond == NULL ? 1 : determine_truth(cond);
5114 check_reachable(fors->body);
5119 next = stmt->base.next;
5123 case STATEMENT_MS_TRY: {
5124 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5125 check_reachable(ms_try->try_statement);
5126 next = ms_try->final_statement;
5130 case STATEMENT_LEAVE: {
5131 statement_t *parent = stmt;
5133 parent = parent->base.parent;
5134 if (parent == NULL) /* __leave not within __try */
5137 if (parent->kind == STATEMENT_MS_TRY) {
5139 next = parent->ms_try.final_statement;
5147 while (next == NULL) {
5148 next = last->base.parent;
5150 noreturn_candidate = false;
5152 type_t *const type = current_function->type;
5153 assert(is_type_function(type));
5154 type_t *const ret = skip_typeref(type->function.return_type);
5155 if (warning.return_type &&
5156 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5157 is_type_valid(ret) &&
5158 !is_sym_main(current_function->symbol)) {
5159 warningf(&stmt->base.source_position,
5160 "control reaches end of non-void function");
5165 switch (next->kind) {
5166 case STATEMENT_INVALID:
5167 case STATEMENT_EMPTY:
5168 case STATEMENT_DECLARATION:
5169 case STATEMENT_EXPRESSION:
5171 case STATEMENT_RETURN:
5172 case STATEMENT_CONTINUE:
5173 case STATEMENT_BREAK:
5174 case STATEMENT_GOTO:
5175 case STATEMENT_LEAVE:
5176 panic("invalid control flow in function");
5178 case STATEMENT_COMPOUND:
5180 case STATEMENT_SWITCH:
5181 case STATEMENT_LABEL:
5182 case STATEMENT_CASE_LABEL:
5184 next = next->base.next;
5187 case STATEMENT_WHILE: {
5189 if (next->base.reachable)
5191 next->base.reachable = true;
5193 while_statement_t const *const whiles = &next->whiles;
5194 int const val = determine_truth(whiles->condition);
5197 check_reachable(whiles->body);
5203 next = next->base.next;
5207 case STATEMENT_DO_WHILE: {
5209 if (next->base.reachable)
5211 next->base.reachable = true;
5213 do_while_statement_t const *const dw = &next->do_while;
5214 int const val = determine_truth(dw->condition);
5217 check_reachable(dw->body);
5223 next = next->base.next;
5227 case STATEMENT_FOR: {
5229 for_statement_t *const fors = &next->fors;
5231 fors->step_reachable = true;
5233 if (fors->condition_reachable)
5235 fors->condition_reachable = true;
5237 expression_t const *const cond = fors->condition;
5239 cond == NULL ? 1 : determine_truth(cond);
5242 check_reachable(fors->body);
5248 next = next->base.next;
5252 case STATEMENT_MS_TRY:
5254 next = next->ms_try.final_statement;
5260 next = stmt->base.parent;
5262 warningf(&stmt->base.source_position,
5263 "control reaches end of non-void function");
5267 check_reachable(next);
5270 static void check_unreachable(statement_t const* const stmt)
5272 if (!stmt->base.reachable &&
5273 stmt->kind != STATEMENT_DO_WHILE &&
5274 stmt->kind != STATEMENT_FOR &&
5275 (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) {
5276 warningf(&stmt->base.source_position, "statement is unreachable");
5279 switch (stmt->kind) {
5280 case STATEMENT_INVALID:
5281 case STATEMENT_EMPTY:
5282 case STATEMENT_RETURN:
5283 case STATEMENT_DECLARATION:
5284 case STATEMENT_EXPRESSION:
5285 case STATEMENT_CONTINUE:
5286 case STATEMENT_BREAK:
5287 case STATEMENT_GOTO:
5289 case STATEMENT_LEAVE:
5292 case STATEMENT_COMPOUND:
5293 if (stmt->compound.statements)
5294 check_unreachable(stmt->compound.statements);
5298 check_unreachable(stmt->ifs.true_statement);
5299 if (stmt->ifs.false_statement != NULL)
5300 check_unreachable(stmt->ifs.false_statement);
5303 case STATEMENT_SWITCH:
5304 check_unreachable(stmt->switchs.body);
5307 case STATEMENT_LABEL:
5308 check_unreachable(stmt->label.statement);
5311 case STATEMENT_CASE_LABEL:
5312 check_unreachable(stmt->case_label.statement);
5315 case STATEMENT_WHILE:
5316 check_unreachable(stmt->whiles.body);
5319 case STATEMENT_DO_WHILE:
5320 check_unreachable(stmt->do_while.body);
5321 if (!stmt->base.reachable) {
5322 expression_t const *const cond = stmt->do_while.condition;
5323 if (determine_truth(cond) >= 0) {
5324 warningf(&cond->base.source_position,
5325 "condition of do-while-loop is unreachable");
5330 case STATEMENT_FOR: {
5331 for_statement_t const* const fors = &stmt->fors;
5333 // if init and step are unreachable, cond is unreachable, too
5334 if (!stmt->base.reachable && !fors->step_reachable) {
5335 warningf(&stmt->base.source_position, "statement is unreachable");
5337 if (!stmt->base.reachable && fors->initialisation != NULL) {
5338 warningf(&fors->initialisation->base.source_position,
5339 "initialisation of for-statement is unreachable");
5342 if (!fors->condition_reachable && fors->condition != NULL) {
5343 warningf(&fors->condition->base.source_position,
5344 "condition of for-statement is unreachable");
5347 if (!fors->step_reachable && fors->step != NULL) {
5348 warningf(&fors->step->base.source_position,
5349 "step of for-statement is unreachable");
5353 check_unreachable(fors->body);
5357 case STATEMENT_MS_TRY: {
5358 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5359 check_unreachable(ms_try->try_statement);
5360 check_unreachable(ms_try->final_statement);
5364 if (stmt->base.next)
5365 check_unreachable(stmt->base.next);
5368 static void parse_external_declaration(void)
5370 /* function-definitions and declarations both start with declaration
5372 declaration_specifiers_t specifiers;
5373 memset(&specifiers, 0, sizeof(specifiers));
5375 add_anchor_token(';');
5376 parse_declaration_specifiers(&specifiers);
5377 rem_anchor_token(';');
5379 /* must be a declaration */
5380 if (token.type == ';') {
5381 parse_anonymous_declaration_rest(&specifiers);
5385 add_anchor_token(',');
5386 add_anchor_token('=');
5387 add_anchor_token(';');
5389 /* declarator is common to both function-definitions and declarations */
5390 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
5392 rem_anchor_token(',');
5393 rem_anchor_token('=');
5394 rem_anchor_token(';');
5396 /* must be a declaration */
5397 switch (token.type) {
5401 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
5405 /* must be a function definition */
5406 parse_kr_declaration_list(ndeclaration);
5408 if (token.type != '{') {
5409 parse_error_expected("while parsing function definition", '{', NULL);
5410 eat_until_matching_token(';');
5414 type_t *type = ndeclaration->type;
5416 /* note that we don't skip typerefs: the standard doesn't allow them here
5417 * (so we can't use is_type_function here) */
5418 if (type->kind != TYPE_FUNCTION) {
5419 if (is_type_valid(type)) {
5420 errorf(HERE, "declarator '%#T' has a body but is not a function type",
5421 type, ndeclaration->symbol);
5427 if (warning.aggregate_return &&
5428 is_type_compound(skip_typeref(type->function.return_type))) {
5429 warningf(HERE, "function '%Y' returns an aggregate",
5430 ndeclaration->symbol);
5432 if (warning.traditional && !type->function.unspecified_parameters) {
5433 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5434 ndeclaration->symbol);
5436 if (warning.old_style_definition && type->function.unspecified_parameters) {
5437 warningf(HERE, "old-style function definition '%Y'",
5438 ndeclaration->symbol);
5441 /* § 6.7.5.3 (14) a function definition with () means no
5442 * parameters (and not unspecified parameters) */
5443 if (type->function.unspecified_parameters
5444 && type->function.parameters == NULL
5445 && !type->function.kr_style_parameters) {
5446 type_t *duplicate = duplicate_type(type);
5447 duplicate->function.unspecified_parameters = false;
5449 type = typehash_insert(duplicate);
5450 if (type != duplicate) {
5451 obstack_free(type_obst, duplicate);
5453 ndeclaration->type = type;
5456 declaration_t *const declaration = record_declaration(ndeclaration, true);
5457 if (ndeclaration != declaration) {
5458 declaration->scope = ndeclaration->scope;
5460 type = skip_typeref(declaration->type);
5462 /* push function parameters and switch scope */
5463 int top = environment_top();
5464 scope_t *last_scope = scope;
5465 set_scope(&declaration->scope);
5467 declaration_t *parameter = declaration->scope.declarations;
5468 for( ; parameter != NULL; parameter = parameter->next) {
5469 if (parameter->parent_scope == &ndeclaration->scope) {
5470 parameter->parent_scope = scope;
5472 assert(parameter->parent_scope == NULL
5473 || parameter->parent_scope == scope);
5474 parameter->parent_scope = scope;
5475 if (parameter->symbol == NULL) {
5476 errorf(¶meter->source_position, "parameter name omitted");
5479 environment_push(parameter);
5482 if (declaration->init.statement != NULL) {
5483 parser_error_multiple_definition(declaration, HERE);
5486 /* parse function body */
5487 int label_stack_top = label_top();
5488 declaration_t *old_current_function = current_function;
5489 current_function = declaration;
5490 current_parent = NULL;
5492 statement_t *const body = parse_compound_statement(false);
5493 declaration->init.statement = body;
5496 check_declarations();
5497 if (warning.return_type ||
5498 warning.unreachable_code ||
5499 (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) {
5500 noreturn_candidate = true;
5501 check_reachable(body);
5502 if (warning.unreachable_code)
5503 check_unreachable(body);
5504 if (warning.missing_noreturn &&
5505 noreturn_candidate &&
5506 !(declaration->modifiers & DM_NORETURN)) {
5507 warningf(&body->base.source_position,
5508 "function '%#T' is candidate for attribute 'noreturn'",
5509 type, declaration->symbol);
5513 assert(current_parent == NULL);
5514 assert(current_function == declaration);
5515 current_function = old_current_function;
5516 label_pop_to(label_stack_top);
5519 assert(scope == &declaration->scope);
5520 set_scope(last_scope);
5521 environment_pop_to(top);
5524 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5525 source_position_t *source_position,
5526 const symbol_t *symbol)
5528 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
5530 type->bitfield.base_type = base_type;
5531 type->bitfield.size_expression = size;
5534 type_t *skipped_type = skip_typeref(base_type);
5535 if (!is_type_integer(skipped_type)) {
5536 errorf(HERE, "bitfield base type '%T' is not an integer type",
5540 bit_size = skipped_type->base.size * 8;
5543 if (is_constant_expression(size)) {
5544 long v = fold_constant(size);
5547 errorf(source_position, "negative width in bit-field '%Y'",
5549 } else if (v == 0) {
5550 errorf(source_position, "zero width for bit-field '%Y'",
5552 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
5553 errorf(source_position, "width of '%Y' exceeds its type",
5556 type->bitfield.bit_size = v;
5563 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
5566 declaration_t *iter = compound_declaration->scope.declarations;
5567 for( ; iter != NULL; iter = iter->next) {
5568 if (iter->namespc != NAMESPACE_NORMAL)
5571 if (iter->symbol == NULL) {
5572 type_t *type = skip_typeref(iter->type);
5573 if (is_type_compound(type)) {
5574 declaration_t *result
5575 = find_compound_entry(type->compound.declaration, symbol);
5582 if (iter->symbol == symbol) {
5590 static void parse_compound_declarators(declaration_t *struct_declaration,
5591 const declaration_specifiers_t *specifiers)
5593 declaration_t *last_declaration = struct_declaration->scope.declarations;
5594 if (last_declaration != NULL) {
5595 while (last_declaration->next != NULL) {
5596 last_declaration = last_declaration->next;
5601 declaration_t *declaration;
5603 if (token.type == ':') {
5604 source_position_t source_position = *HERE;
5607 type_t *base_type = specifiers->type;
5608 expression_t *size = parse_constant_expression();
5610 type_t *type = make_bitfield_type(base_type, size,
5611 &source_position, sym_anonymous);
5613 declaration = allocate_declaration_zero();
5614 declaration->namespc = NAMESPACE_NORMAL;
5615 declaration->declared_storage_class = STORAGE_CLASS_NONE;
5616 declaration->storage_class = STORAGE_CLASS_NONE;
5617 declaration->source_position = source_position;
5618 declaration->modifiers = specifiers->modifiers;
5619 declaration->type = type;
5621 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
5623 type_t *orig_type = declaration->type;
5624 type_t *type = skip_typeref(orig_type);
5626 if (token.type == ':') {
5627 source_position_t source_position = *HERE;
5629 expression_t *size = parse_constant_expression();
5631 type_t *bitfield_type = make_bitfield_type(orig_type, size,
5632 &source_position, declaration->symbol);
5633 declaration->type = bitfield_type;
5635 /* TODO we ignore arrays for now... what is missing is a check
5636 * that they're at the end of the struct */
5637 if (is_type_incomplete(type) && !is_type_array(type)) {
5639 "compound member '%Y' has incomplete type '%T'",
5640 declaration->symbol, orig_type);
5641 } else if (is_type_function(type)) {
5642 errorf(HERE, "compound member '%Y' must not have function type '%T'",
5643 declaration->symbol, orig_type);
5648 /* make sure we don't define a symbol multiple times */
5649 symbol_t *symbol = declaration->symbol;
5650 if (symbol != NULL) {
5651 declaration_t *prev_decl
5652 = find_compound_entry(struct_declaration, symbol);
5654 if (prev_decl != NULL) {
5655 assert(prev_decl->symbol == symbol);
5656 errorf(&declaration->source_position,
5657 "multiple declarations of symbol '%Y' (declared %P)",
5658 symbol, &prev_decl->source_position);
5662 /* append declaration */
5663 if (last_declaration != NULL) {
5664 last_declaration->next = declaration;
5666 struct_declaration->scope.declarations = declaration;
5668 last_declaration = declaration;
5670 if (token.type != ',')
5680 static void parse_compound_type_entries(declaration_t *compound_declaration)
5683 add_anchor_token('}');
5685 while (token.type != '}' && token.type != T_EOF) {
5686 declaration_specifiers_t specifiers;
5687 memset(&specifiers, 0, sizeof(specifiers));
5688 parse_declaration_specifiers(&specifiers);
5690 parse_compound_declarators(compound_declaration, &specifiers);
5692 rem_anchor_token('}');
5694 if (token.type == T_EOF) {
5695 errorf(HERE, "EOF while parsing struct");
5700 static type_t *parse_typename(void)
5702 declaration_specifiers_t specifiers;
5703 memset(&specifiers, 0, sizeof(specifiers));
5704 parse_declaration_specifiers(&specifiers);
5705 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
5706 /* TODO: improve error message, user does probably not know what a
5707 * storage class is...
5709 errorf(HERE, "typename may not have a storage class");
5712 type_t *result = parse_abstract_declarator(specifiers.type);
5720 typedef expression_t* (*parse_expression_function) (unsigned precedence);
5721 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
5722 expression_t *left);
5724 typedef struct expression_parser_function_t expression_parser_function_t;
5725 struct expression_parser_function_t {
5726 unsigned precedence;
5727 parse_expression_function parser;
5728 unsigned infix_precedence;
5729 parse_expression_infix_function infix_parser;
5732 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5735 * Prints an error message if an expression was expected but not read
5737 static expression_t *expected_expression_error(void)
5739 /* skip the error message if the error token was read */
5740 if (token.type != T_ERROR) {
5741 errorf(HERE, "expected expression, got token '%K'", &token);
5745 return create_invalid_expression();
5749 * Parse a string constant.
5751 static expression_t *parse_string_const(void)
5754 if (token.type == T_STRING_LITERAL) {
5755 string_t res = token.v.string;
5757 while (token.type == T_STRING_LITERAL) {
5758 res = concat_strings(&res, &token.v.string);
5761 if (token.type != T_WIDE_STRING_LITERAL) {
5762 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
5763 /* note: that we use type_char_ptr here, which is already the
5764 * automatic converted type. revert_automatic_type_conversion
5765 * will construct the array type */
5766 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
5767 cnst->string.value = res;
5771 wres = concat_string_wide_string(&res, &token.v.wide_string);
5773 wres = token.v.wide_string;
5778 switch (token.type) {
5779 case T_WIDE_STRING_LITERAL:
5780 wres = concat_wide_strings(&wres, &token.v.wide_string);
5783 case T_STRING_LITERAL:
5784 wres = concat_wide_string_string(&wres, &token.v.string);
5788 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5789 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5790 cnst->wide_string.value = wres;
5799 * Parse an integer constant.
5801 static expression_t *parse_int_const(void)
5803 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5804 cnst->base.source_position = *HERE;
5805 cnst->base.type = token.datatype;
5806 cnst->conste.v.int_value = token.v.intvalue;
5814 * Parse a character constant.
5816 static expression_t *parse_character_constant(void)
5818 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5820 cnst->base.source_position = *HERE;
5821 cnst->base.type = token.datatype;
5822 cnst->conste.v.character = token.v.string;
5824 if (cnst->conste.v.character.size != 1) {
5825 if (warning.multichar && (c_mode & _GNUC)) {
5827 warningf(HERE, "multi-character character constant");
5829 errorf(HERE, "more than 1 characters in character constant");
5838 * Parse a wide character constant.
5840 static expression_t *parse_wide_character_constant(void)
5842 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5844 cnst->base.source_position = *HERE;
5845 cnst->base.type = token.datatype;
5846 cnst->conste.v.wide_character = token.v.wide_string;
5848 if (cnst->conste.v.wide_character.size != 1) {
5849 if (warning.multichar && (c_mode & _GNUC)) {
5851 warningf(HERE, "multi-character character constant");
5853 errorf(HERE, "more than 1 characters in character constant");
5862 * Parse a float constant.
5864 static expression_t *parse_float_const(void)
5866 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5867 cnst->base.type = token.datatype;
5868 cnst->conste.v.float_value = token.v.floatvalue;
5875 static declaration_t *create_implicit_function(symbol_t *symbol,
5876 const source_position_t *source_position)
5878 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5879 ntype->function.return_type = type_int;
5880 ntype->function.unspecified_parameters = true;
5882 type_t *type = typehash_insert(ntype);
5883 if (type != ntype) {
5887 declaration_t *const declaration = allocate_declaration_zero();
5888 declaration->storage_class = STORAGE_CLASS_EXTERN;
5889 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5890 declaration->type = type;
5891 declaration->symbol = symbol;
5892 declaration->source_position = *source_position;
5893 declaration->implicit = true;
5895 bool strict_prototypes_old = warning.strict_prototypes;
5896 warning.strict_prototypes = false;
5897 record_declaration(declaration, false);
5898 warning.strict_prototypes = strict_prototypes_old;
5904 * Creates a return_type (func)(argument_type) function type if not
5907 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5908 type_t *argument_type2)
5910 function_parameter_t *parameter2
5911 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5912 memset(parameter2, 0, sizeof(parameter2[0]));
5913 parameter2->type = argument_type2;
5915 function_parameter_t *parameter1
5916 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5917 memset(parameter1, 0, sizeof(parameter1[0]));
5918 parameter1->type = argument_type1;
5919 parameter1->next = parameter2;
5921 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5922 type->function.return_type = return_type;
5923 type->function.parameters = parameter1;
5925 type_t *result = typehash_insert(type);
5926 if (result != type) {
5934 * Creates a return_type (func)(argument_type) function type if not
5937 * @param return_type the return type
5938 * @param argument_type the argument type
5940 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5942 function_parameter_t *parameter
5943 = obstack_alloc(type_obst, sizeof(parameter[0]));
5944 memset(parameter, 0, sizeof(parameter[0]));
5945 parameter->type = argument_type;
5947 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5948 type->function.return_type = return_type;
5949 type->function.parameters = parameter;
5951 type_t *result = typehash_insert(type);
5952 if (result != type) {
5959 static type_t *make_function_0_type(type_t *return_type)
5961 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5962 type->function.return_type = return_type;
5963 type->function.parameters = NULL;
5965 type_t *result = typehash_insert(type);
5966 if (result != type) {
5974 * Creates a function type for some function like builtins.
5976 * @param symbol the symbol describing the builtin
5978 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5980 switch(symbol->ID) {
5981 case T___builtin_alloca:
5982 return make_function_1_type(type_void_ptr, type_size_t);
5983 case T___builtin_huge_val:
5984 return make_function_0_type(type_double);
5985 case T___builtin_nan:
5986 return make_function_1_type(type_double, type_char_ptr);
5987 case T___builtin_nanf:
5988 return make_function_1_type(type_float, type_char_ptr);
5989 case T___builtin_nand:
5990 return make_function_1_type(type_long_double, type_char_ptr);
5991 case T___builtin_va_end:
5992 return make_function_1_type(type_void, type_valist);
5993 case T___builtin_expect:
5994 return make_function_2_type(type_long, type_long, type_long);
5996 internal_errorf(HERE, "not implemented builtin symbol found");
6001 * Performs automatic type cast as described in § 6.3.2.1.
6003 * @param orig_type the original type
6005 static type_t *automatic_type_conversion(type_t *orig_type)
6007 type_t *type = skip_typeref(orig_type);
6008 if (is_type_array(type)) {
6009 array_type_t *array_type = &type->array;
6010 type_t *element_type = array_type->element_type;
6011 unsigned qualifiers = array_type->base.qualifiers;
6013 return make_pointer_type(element_type, qualifiers);
6016 if (is_type_function(type)) {
6017 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6024 * reverts the automatic casts of array to pointer types and function
6025 * to function-pointer types as defined § 6.3.2.1
6027 type_t *revert_automatic_type_conversion(const expression_t *expression)
6029 switch (expression->kind) {
6030 case EXPR_REFERENCE: return expression->reference.declaration->type;
6033 return get_qualified_type(expression->select.compound_entry->type,
6034 expression->base.type->base.qualifiers);
6036 case EXPR_UNARY_DEREFERENCE: {
6037 const expression_t *const value = expression->unary.value;
6038 type_t *const type = skip_typeref(value->base.type);
6039 assert(is_type_pointer(type));
6040 return type->pointer.points_to;
6043 case EXPR_BUILTIN_SYMBOL:
6044 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6046 case EXPR_ARRAY_ACCESS: {
6047 const expression_t *array_ref = expression->array_access.array_ref;
6048 type_t *type_left = skip_typeref(array_ref->base.type);
6049 if (!is_type_valid(type_left))
6051 assert(is_type_pointer(type_left));
6052 return type_left->pointer.points_to;
6055 case EXPR_STRING_LITERAL: {
6056 size_t size = expression->string.value.size;
6057 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6060 case EXPR_WIDE_STRING_LITERAL: {
6061 size_t size = expression->wide_string.value.size;
6062 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6065 case EXPR_COMPOUND_LITERAL:
6066 return expression->compound_literal.type;
6071 return expression->base.type;
6074 static expression_t *parse_reference(void)
6076 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
6078 reference_expression_t *ref = &expression->reference;
6079 symbol_t *const symbol = token.v.symbol;
6081 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
6083 if (declaration == NULL) {
6084 if (!strict_mode && look_ahead(1)->type == '(') {
6085 /* an implicitly declared function */
6086 if (warning.implicit_function_declaration) {
6087 warningf(HERE, "implicit declaration of function '%Y'",
6091 declaration = create_implicit_function(symbol, HERE);
6093 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6094 declaration = create_error_declaration(symbol, STORAGE_CLASS_NONE);
6098 type_t *type = declaration->type;
6100 /* we always do the auto-type conversions; the & and sizeof parser contains
6101 * code to revert this! */
6102 type = automatic_type_conversion(type);
6104 ref->declaration = declaration;
6105 ref->base.type = type;
6107 /* this declaration is used */
6108 declaration->used = true;
6110 /* check for deprecated functions */
6111 if (warning.deprecated_declarations &&
6112 declaration->modifiers & DM_DEPRECATED) {
6113 char const *const prefix = is_type_function(declaration->type) ?
6114 "function" : "variable";
6116 if (declaration->deprecated_string != NULL) {
6117 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6118 prefix, declaration->symbol, &declaration->source_position,
6119 declaration->deprecated_string);
6121 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6122 declaration->symbol, &declaration->source_position);
6125 if (warning.init_self && declaration == current_init_decl) {
6126 current_init_decl = NULL;
6127 warningf(HERE, "variable '%#T' is initialized by itself",
6128 declaration->type, declaration->symbol);
6135 static bool semantic_cast(expression_t *cast)
6137 expression_t *expression = cast->unary.value;
6138 type_t *orig_dest_type = cast->base.type;
6139 type_t *orig_type_right = expression->base.type;
6140 type_t const *dst_type = skip_typeref(orig_dest_type);
6141 type_t const *src_type = skip_typeref(orig_type_right);
6142 source_position_t const *pos = &cast->base.source_position;
6144 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6145 if (dst_type == type_void)
6148 /* only integer and pointer can be casted to pointer */
6149 if (is_type_pointer(dst_type) &&
6150 !is_type_pointer(src_type) &&
6151 !is_type_integer(src_type) &&
6152 is_type_valid(src_type)) {
6153 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6157 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6158 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6162 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6163 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6167 if (warning.cast_qual &&
6168 is_type_pointer(src_type) &&
6169 is_type_pointer(dst_type)) {
6170 type_t *src = skip_typeref(src_type->pointer.points_to);
6171 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6172 unsigned missing_qualifiers =
6173 src->base.qualifiers & ~dst->base.qualifiers;
6174 if (missing_qualifiers != 0) {
6176 "cast discards qualifiers '%Q' in pointer target type of '%T'",
6177 missing_qualifiers, orig_type_right);
6183 static expression_t *parse_compound_literal(type_t *type)
6185 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6187 parse_initializer_env_t env;
6189 env.declaration = NULL;
6190 env.must_be_constant = false;
6191 initializer_t *initializer = parse_initializer(&env);
6194 expression->compound_literal.initializer = initializer;
6195 expression->compound_literal.type = type;
6196 expression->base.type = automatic_type_conversion(type);
6202 * Parse a cast expression.
6204 static expression_t *parse_cast(void)
6206 add_anchor_token(')');
6208 source_position_t source_position = token.source_position;
6210 type_t *type = parse_typename();
6212 rem_anchor_token(')');
6215 if (token.type == '{') {
6216 return parse_compound_literal(type);
6219 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6220 cast->base.source_position = source_position;
6222 expression_t *value = parse_sub_expression(20);
6223 cast->base.type = type;
6224 cast->unary.value = value;
6226 if (! semantic_cast(cast)) {
6227 /* TODO: record the error in the AST. else it is impossible to detect it */
6232 return create_invalid_expression();
6236 * Parse a statement expression.
6238 static expression_t *parse_statement_expression(void)
6240 add_anchor_token(')');
6242 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6244 statement_t *statement = parse_compound_statement(true);
6245 expression->statement.statement = statement;
6246 expression->base.source_position = statement->base.source_position;
6248 /* find last statement and use its type */
6249 type_t *type = type_void;
6250 const statement_t *stmt = statement->compound.statements;
6252 while (stmt->base.next != NULL)
6253 stmt = stmt->base.next;
6255 if (stmt->kind == STATEMENT_EXPRESSION) {
6256 type = stmt->expression.expression->base.type;
6259 warningf(&expression->base.source_position, "empty statement expression ({})");
6261 expression->base.type = type;
6263 rem_anchor_token(')');
6271 * Parse a parenthesized expression.
6273 static expression_t *parse_parenthesized_expression(void)
6277 switch(token.type) {
6279 /* gcc extension: a statement expression */
6280 return parse_statement_expression();
6284 return parse_cast();
6286 if (is_typedef_symbol(token.v.symbol)) {
6287 return parse_cast();
6291 add_anchor_token(')');
6292 expression_t *result = parse_expression();
6293 rem_anchor_token(')');
6300 static expression_t *parse_function_keyword(void)
6305 if (current_function == NULL) {
6306 errorf(HERE, "'__func__' used outside of a function");
6309 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6310 expression->base.type = type_char_ptr;
6311 expression->funcname.kind = FUNCNAME_FUNCTION;
6316 static expression_t *parse_pretty_function_keyword(void)
6318 eat(T___PRETTY_FUNCTION__);
6320 if (current_function == NULL) {
6321 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6324 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6325 expression->base.type = type_char_ptr;
6326 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6331 static expression_t *parse_funcsig_keyword(void)
6335 if (current_function == NULL) {
6336 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6339 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6340 expression->base.type = type_char_ptr;
6341 expression->funcname.kind = FUNCNAME_FUNCSIG;
6346 static expression_t *parse_funcdname_keyword(void)
6348 eat(T___FUNCDNAME__);
6350 if (current_function == NULL) {
6351 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6354 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6355 expression->base.type = type_char_ptr;
6356 expression->funcname.kind = FUNCNAME_FUNCDNAME;
6361 static designator_t *parse_designator(void)
6363 designator_t *result = allocate_ast_zero(sizeof(result[0]));
6364 result->source_position = *HERE;
6366 if (token.type != T_IDENTIFIER) {
6367 parse_error_expected("while parsing member designator",
6368 T_IDENTIFIER, NULL);
6371 result->symbol = token.v.symbol;
6374 designator_t *last_designator = result;
6376 if (token.type == '.') {
6378 if (token.type != T_IDENTIFIER) {
6379 parse_error_expected("while parsing member designator",
6380 T_IDENTIFIER, NULL);
6383 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6384 designator->source_position = *HERE;
6385 designator->symbol = token.v.symbol;
6388 last_designator->next = designator;
6389 last_designator = designator;
6392 if (token.type == '[') {
6394 add_anchor_token(']');
6395 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6396 designator->source_position = *HERE;
6397 designator->array_index = parse_expression();
6398 rem_anchor_token(']');
6400 if (designator->array_index == NULL) {
6404 last_designator->next = designator;
6405 last_designator = designator;
6417 * Parse the __builtin_offsetof() expression.
6419 static expression_t *parse_offsetof(void)
6421 eat(T___builtin_offsetof);
6423 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6424 expression->base.type = type_size_t;
6427 add_anchor_token(',');
6428 type_t *type = parse_typename();
6429 rem_anchor_token(',');
6431 add_anchor_token(')');
6432 designator_t *designator = parse_designator();
6433 rem_anchor_token(')');
6436 expression->offsetofe.type = type;
6437 expression->offsetofe.designator = designator;
6440 memset(&path, 0, sizeof(path));
6441 path.top_type = type;
6442 path.path = NEW_ARR_F(type_path_entry_t, 0);
6444 descend_into_subtype(&path);
6446 if (!walk_designator(&path, designator, true)) {
6447 return create_invalid_expression();
6450 DEL_ARR_F(path.path);
6454 return create_invalid_expression();
6458 * Parses a _builtin_va_start() expression.
6460 static expression_t *parse_va_start(void)
6462 eat(T___builtin_va_start);
6464 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6467 add_anchor_token(',');
6468 expression->va_starte.ap = parse_assignment_expression();
6469 rem_anchor_token(',');
6471 expression_t *const expr = parse_assignment_expression();
6472 if (expr->kind == EXPR_REFERENCE) {
6473 declaration_t *const decl = expr->reference.declaration;
6474 if (decl->parent_scope != ¤t_function->scope || decl->next != NULL) {
6475 errorf(&expr->base.source_position,
6476 "second argument of 'va_start' must be last parameter of the current function");
6478 expression->va_starte.parameter = decl;
6484 return create_invalid_expression();
6488 * Parses a _builtin_va_arg() expression.
6490 static expression_t *parse_va_arg(void)
6492 eat(T___builtin_va_arg);
6494 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6497 expression->va_arge.ap = parse_assignment_expression();
6499 expression->base.type = parse_typename();
6504 return create_invalid_expression();
6507 static expression_t *parse_builtin_symbol(void)
6509 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
6511 symbol_t *symbol = token.v.symbol;
6513 expression->builtin_symbol.symbol = symbol;
6516 type_t *type = get_builtin_symbol_type(symbol);
6517 type = automatic_type_conversion(type);
6519 expression->base.type = type;
6524 * Parses a __builtin_constant() expression.
6526 static expression_t *parse_builtin_constant(void)
6528 eat(T___builtin_constant_p);
6530 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6533 add_anchor_token(')');
6534 expression->builtin_constant.value = parse_assignment_expression();
6535 rem_anchor_token(')');
6537 expression->base.type = type_int;
6541 return create_invalid_expression();
6545 * Parses a __builtin_prefetch() expression.
6547 static expression_t *parse_builtin_prefetch(void)
6549 eat(T___builtin_prefetch);
6551 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
6554 add_anchor_token(')');
6555 expression->builtin_prefetch.adr = parse_assignment_expression();
6556 if (token.type == ',') {
6558 expression->builtin_prefetch.rw = parse_assignment_expression();
6560 if (token.type == ',') {
6562 expression->builtin_prefetch.locality = parse_assignment_expression();
6564 rem_anchor_token(')');
6566 expression->base.type = type_void;
6570 return create_invalid_expression();
6574 * Parses a __builtin_is_*() compare expression.
6576 static expression_t *parse_compare_builtin(void)
6578 expression_t *expression;
6580 switch(token.type) {
6581 case T___builtin_isgreater:
6582 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6584 case T___builtin_isgreaterequal:
6585 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6587 case T___builtin_isless:
6588 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6590 case T___builtin_islessequal:
6591 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6593 case T___builtin_islessgreater:
6594 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6596 case T___builtin_isunordered:
6597 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6600 internal_errorf(HERE, "invalid compare builtin found");
6603 expression->base.source_position = *HERE;
6607 expression->binary.left = parse_assignment_expression();
6609 expression->binary.right = parse_assignment_expression();
6612 type_t *const orig_type_left = expression->binary.left->base.type;
6613 type_t *const orig_type_right = expression->binary.right->base.type;
6615 type_t *const type_left = skip_typeref(orig_type_left);
6616 type_t *const type_right = skip_typeref(orig_type_right);
6617 if (!is_type_float(type_left) && !is_type_float(type_right)) {
6618 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6619 type_error_incompatible("invalid operands in comparison",
6620 &expression->base.source_position, orig_type_left, orig_type_right);
6623 semantic_comparison(&expression->binary);
6628 return create_invalid_expression();
6633 * Parses a __builtin_expect() expression.
6635 static expression_t *parse_builtin_expect(void)
6637 eat(T___builtin_expect);
6639 expression_t *expression
6640 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
6643 expression->binary.left = parse_assignment_expression();
6645 expression->binary.right = parse_constant_expression();
6648 expression->base.type = expression->binary.left->base.type;
6652 return create_invalid_expression();
6657 * Parses a MS assume() expression.
6659 static expression_t *parse_assume(void)
6663 expression_t *expression
6664 = allocate_expression_zero(EXPR_UNARY_ASSUME);
6667 add_anchor_token(')');
6668 expression->unary.value = parse_assignment_expression();
6669 rem_anchor_token(')');
6672 expression->base.type = type_void;
6675 return create_invalid_expression();
6679 * Return the declaration for a given label symbol or create a new one.
6681 * @param symbol the symbol of the label
6683 static declaration_t *get_label(symbol_t *symbol)
6685 declaration_t *candidate;
6686 assert(current_function != NULL);
6688 candidate = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
6689 /* if we found a local label, we already created the declaration */
6690 if (candidate != NULL) {
6691 assert(candidate->parent_scope == scope);
6695 candidate = get_declaration(symbol, NAMESPACE_LABEL);
6696 /* if we found a label in the same function, then we already created the
6698 if (candidate != NULL
6699 && candidate->parent_scope == ¤t_function->scope) {
6703 /* otherwise we need to create a new one */
6704 declaration_t *const declaration = allocate_declaration_zero();
6705 declaration->namespc = NAMESPACE_LABEL;
6706 declaration->symbol = symbol;
6708 label_push(declaration);
6714 * Parses a GNU && label address expression.
6716 static expression_t *parse_label_address(void)
6718 source_position_t source_position = token.source_position;
6720 if (token.type != T_IDENTIFIER) {
6721 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6724 symbol_t *symbol = token.v.symbol;
6727 declaration_t *label = get_label(symbol);
6730 label->address_taken = true;
6732 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6733 expression->base.source_position = source_position;
6735 /* label address is threaten as a void pointer */
6736 expression->base.type = type_void_ptr;
6737 expression->label_address.declaration = label;
6740 return create_invalid_expression();
6744 * Parse a microsoft __noop expression.
6746 static expression_t *parse_noop_expression(void)
6748 source_position_t source_position = *HERE;
6751 if (token.type == '(') {
6752 /* parse arguments */
6754 add_anchor_token(')');
6755 add_anchor_token(',');
6757 if (token.type != ')') {
6759 (void)parse_assignment_expression();
6760 if (token.type != ',')
6766 rem_anchor_token(',');
6767 rem_anchor_token(')');
6770 /* the result is a (int)0 */
6771 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6772 cnst->base.source_position = source_position;
6773 cnst->base.type = type_int;
6774 cnst->conste.v.int_value = 0;
6775 cnst->conste.is_ms_noop = true;
6780 return create_invalid_expression();
6784 * Parses a primary expression.
6786 static expression_t *parse_primary_expression(void)
6788 switch (token.type) {
6789 case T_INTEGER: return parse_int_const();
6790 case T_CHARACTER_CONSTANT: return parse_character_constant();
6791 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
6792 case T_FLOATINGPOINT: return parse_float_const();
6793 case T_STRING_LITERAL:
6794 case T_WIDE_STRING_LITERAL: return parse_string_const();
6795 case T_IDENTIFIER: return parse_reference();
6796 case T___FUNCTION__:
6797 case T___func__: return parse_function_keyword();
6798 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
6799 case T___FUNCSIG__: return parse_funcsig_keyword();
6800 case T___FUNCDNAME__: return parse_funcdname_keyword();
6801 case T___builtin_offsetof: return parse_offsetof();
6802 case T___builtin_va_start: return parse_va_start();
6803 case T___builtin_va_arg: return parse_va_arg();
6804 case T___builtin_expect:
6805 case T___builtin_alloca:
6806 case T___builtin_nan:
6807 case T___builtin_nand:
6808 case T___builtin_nanf:
6809 case T___builtin_huge_val:
6810 case T___builtin_va_end: return parse_builtin_symbol();
6811 case T___builtin_isgreater:
6812 case T___builtin_isgreaterequal:
6813 case T___builtin_isless:
6814 case T___builtin_islessequal:
6815 case T___builtin_islessgreater:
6816 case T___builtin_isunordered: return parse_compare_builtin();
6817 case T___builtin_constant_p: return parse_builtin_constant();
6818 case T___builtin_prefetch: return parse_builtin_prefetch();
6819 case T__assume: return parse_assume();
6822 return parse_label_address();
6825 case '(': return parse_parenthesized_expression();
6826 case T___noop: return parse_noop_expression();
6829 errorf(HERE, "unexpected token %K, expected an expression", &token);
6830 return create_invalid_expression();
6834 * Check if the expression has the character type and issue a warning then.
6836 static void check_for_char_index_type(const expression_t *expression)
6838 type_t *const type = expression->base.type;
6839 const type_t *const base_type = skip_typeref(type);
6841 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
6842 warning.char_subscripts) {
6843 warningf(&expression->base.source_position,
6844 "array subscript has type '%T'", type);
6848 static expression_t *parse_array_expression(unsigned precedence,
6854 add_anchor_token(']');
6856 expression_t *inside = parse_expression();
6858 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6860 array_access_expression_t *array_access = &expression->array_access;
6862 type_t *const orig_type_left = left->base.type;
6863 type_t *const orig_type_inside = inside->base.type;
6865 type_t *const type_left = skip_typeref(orig_type_left);
6866 type_t *const type_inside = skip_typeref(orig_type_inside);
6868 type_t *return_type;
6869 if (is_type_pointer(type_left)) {
6870 return_type = type_left->pointer.points_to;
6871 array_access->array_ref = left;
6872 array_access->index = inside;
6873 check_for_char_index_type(inside);
6874 } else if (is_type_pointer(type_inside)) {
6875 return_type = type_inside->pointer.points_to;
6876 array_access->array_ref = inside;
6877 array_access->index = left;
6878 array_access->flipped = true;
6879 check_for_char_index_type(left);
6881 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
6883 "array access on object with non-pointer types '%T', '%T'",
6884 orig_type_left, orig_type_inside);
6886 return_type = type_error_type;
6887 array_access->array_ref = left;
6888 array_access->index = inside;
6891 expression->base.type = automatic_type_conversion(return_type);
6893 rem_anchor_token(']');
6894 if (token.type == ']') {
6897 parse_error_expected("Problem while parsing array access", ']', NULL);
6902 static expression_t *parse_typeprop(expression_kind_t const kind,
6903 source_position_t const pos,
6904 unsigned const precedence)
6906 expression_t *tp_expression = allocate_expression_zero(kind);
6907 tp_expression->base.type = type_size_t;
6908 tp_expression->base.source_position = pos;
6910 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6912 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6914 add_anchor_token(')');
6915 type_t* const orig_type = parse_typename();
6916 tp_expression->typeprop.type = orig_type;
6918 type_t const* const type = skip_typeref(orig_type);
6919 char const* const wrong_type =
6920 is_type_incomplete(type) ? "incomplete" :
6921 type->kind == TYPE_FUNCTION ? "function designator" :
6922 type->kind == TYPE_BITFIELD ? "bitfield" :
6924 if (wrong_type != NULL) {
6925 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6926 what, wrong_type, type);
6929 rem_anchor_token(')');
6932 expression_t *expression = parse_sub_expression(precedence);
6934 type_t* const orig_type = revert_automatic_type_conversion(expression);
6935 expression->base.type = orig_type;
6937 type_t const* const type = skip_typeref(orig_type);
6938 char const* const wrong_type =
6939 is_type_incomplete(type) ? "incomplete" :
6940 type->kind == TYPE_FUNCTION ? "function designator" :
6941 type->kind == TYPE_BITFIELD ? "bitfield" :
6943 if (wrong_type != NULL) {
6944 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6947 tp_expression->typeprop.type = expression->base.type;
6948 tp_expression->typeprop.tp_expression = expression;
6952 return tp_expression;
6955 static expression_t *parse_sizeof(unsigned precedence)
6957 source_position_t pos = *HERE;
6959 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
6962 static expression_t *parse_alignof(unsigned precedence)
6964 source_position_t pos = *HERE;
6966 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
6969 static expression_t *parse_select_expression(unsigned precedence,
6970 expression_t *compound)
6973 assert(token.type == '.' || token.type == T_MINUSGREATER);
6975 bool is_pointer = (token.type == T_MINUSGREATER);
6978 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6979 select->select.compound = compound;
6981 if (token.type != T_IDENTIFIER) {
6982 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6985 symbol_t *symbol = token.v.symbol;
6988 type_t *const orig_type = compound->base.type;
6989 type_t *const type = skip_typeref(orig_type);
6992 bool saw_error = false;
6993 if (is_type_pointer(type)) {
6996 "request for member '%Y' in something not a struct or union, but '%T'",
7000 type_left = skip_typeref(type->pointer.points_to);
7002 if (is_pointer && is_type_valid(type)) {
7003 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7009 declaration_t *entry;
7010 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7011 type_left->kind == TYPE_COMPOUND_UNION) {
7012 declaration_t *const declaration = type_left->compound.declaration;
7014 if (!declaration->init.complete) {
7015 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7017 goto create_error_entry;
7020 entry = find_compound_entry(declaration, symbol);
7021 if (entry == NULL) {
7022 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7023 goto create_error_entry;
7026 if (is_type_valid(type_left) && !saw_error) {
7028 "request for member '%Y' in something not a struct or union, but '%T'",
7032 entry = allocate_declaration_zero();
7033 entry->symbol = symbol;
7036 select->select.compound_entry = entry;
7038 type_t *const res_type =
7039 get_qualified_type(entry->type, type_left->base.qualifiers);
7041 /* we always do the auto-type conversions; the & and sizeof parser contains
7042 * code to revert this! */
7043 select->base.type = automatic_type_conversion(res_type);
7045 type_t *skipped = skip_typeref(res_type);
7046 if (skipped->kind == TYPE_BITFIELD) {
7047 select->base.type = skipped->bitfield.base_type;
7053 static void check_call_argument(const function_parameter_t *parameter,
7054 call_argument_t *argument, unsigned pos)
7056 type_t *expected_type = parameter->type;
7057 type_t *expected_type_skip = skip_typeref(expected_type);
7058 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7059 expression_t *arg_expr = argument->expression;
7060 type_t *arg_type = skip_typeref(arg_expr->base.type);
7062 /* handle transparent union gnu extension */
7063 if (is_type_union(expected_type_skip)
7064 && (expected_type_skip->base.modifiers
7065 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7066 declaration_t *union_decl = expected_type_skip->compound.declaration;
7068 declaration_t *declaration = union_decl->scope.declarations;
7069 type_t *best_type = NULL;
7070 for ( ; declaration != NULL; declaration = declaration->next) {
7071 type_t *decl_type = declaration->type;
7072 error = semantic_assign(decl_type, arg_expr);
7073 if (error == ASSIGN_ERROR_INCOMPATIBLE
7074 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7077 if (error == ASSIGN_SUCCESS) {
7078 best_type = decl_type;
7079 } else if (best_type == NULL) {
7080 best_type = decl_type;
7084 if (best_type != NULL) {
7085 expected_type = best_type;
7089 error = semantic_assign(expected_type, arg_expr);
7090 argument->expression = create_implicit_cast(argument->expression,
7093 if (error != ASSIGN_SUCCESS) {
7094 /* report exact scope in error messages (like "in argument 3") */
7096 snprintf(buf, sizeof(buf), "call argument %u", pos);
7097 report_assign_error(error, expected_type, arg_expr, buf,
7098 &arg_expr->base.source_position);
7099 } else if (warning.traditional || warning.conversion) {
7100 type_t *const promoted_type = get_default_promoted_type(arg_type);
7101 if (!types_compatible(expected_type_skip, promoted_type) &&
7102 !types_compatible(expected_type_skip, type_void_ptr) &&
7103 !types_compatible(type_void_ptr, promoted_type)) {
7104 /* Deliberately show the skipped types in this warning */
7105 warningf(&arg_expr->base.source_position,
7106 "passing call argument %u as '%T' rather than '%T' due to prototype",
7107 pos, expected_type_skip, promoted_type);
7113 * Parse a call expression, ie. expression '( ... )'.
7115 * @param expression the function address
7117 static expression_t *parse_call_expression(unsigned precedence,
7118 expression_t *expression)
7121 expression_t *result = allocate_expression_zero(EXPR_CALL);
7122 result->base.source_position = expression->base.source_position;
7124 call_expression_t *call = &result->call;
7125 call->function = expression;
7127 type_t *const orig_type = expression->base.type;
7128 type_t *const type = skip_typeref(orig_type);
7130 function_type_t *function_type = NULL;
7131 if (is_type_pointer(type)) {
7132 type_t *const to_type = skip_typeref(type->pointer.points_to);
7134 if (is_type_function(to_type)) {
7135 function_type = &to_type->function;
7136 call->base.type = function_type->return_type;
7140 if (function_type == NULL && is_type_valid(type)) {
7141 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7144 /* parse arguments */
7146 add_anchor_token(')');
7147 add_anchor_token(',');
7149 if (token.type != ')') {
7150 call_argument_t *last_argument = NULL;
7153 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7155 argument->expression = parse_assignment_expression();
7156 if (last_argument == NULL) {
7157 call->arguments = argument;
7159 last_argument->next = argument;
7161 last_argument = argument;
7163 if (token.type != ',')
7168 rem_anchor_token(',');
7169 rem_anchor_token(')');
7172 if (function_type == NULL)
7175 function_parameter_t *parameter = function_type->parameters;
7176 call_argument_t *argument = call->arguments;
7177 if (!function_type->unspecified_parameters) {
7178 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7179 parameter = parameter->next, argument = argument->next) {
7180 check_call_argument(parameter, argument, ++pos);
7183 if (parameter != NULL) {
7184 errorf(HERE, "too few arguments to function '%E'", expression);
7185 } else if (argument != NULL && !function_type->variadic) {
7186 errorf(HERE, "too many arguments to function '%E'", expression);
7190 /* do default promotion */
7191 for( ; argument != NULL; argument = argument->next) {
7192 type_t *type = argument->expression->base.type;
7194 type = get_default_promoted_type(type);
7196 argument->expression
7197 = create_implicit_cast(argument->expression, type);
7200 check_format(&result->call);
7202 if (warning.aggregate_return &&
7203 is_type_compound(skip_typeref(function_type->return_type))) {
7204 warningf(&result->base.source_position,
7205 "function call has aggregate value");
7212 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7214 static bool same_compound_type(const type_t *type1, const type_t *type2)
7217 is_type_compound(type1) &&
7218 type1->kind == type2->kind &&
7219 type1->compound.declaration == type2->compound.declaration;
7223 * Parse a conditional expression, ie. 'expression ? ... : ...'.
7225 * @param expression the conditional expression
7227 static expression_t *parse_conditional_expression(unsigned precedence,
7228 expression_t *expression)
7230 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7232 conditional_expression_t *conditional = &result->conditional;
7233 conditional->base.source_position = *HERE;
7234 conditional->condition = expression;
7237 add_anchor_token(':');
7240 type_t *const condition_type_orig = expression->base.type;
7241 type_t *const condition_type = skip_typeref(condition_type_orig);
7242 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
7243 type_error("expected a scalar type in conditional condition",
7244 &expression->base.source_position, condition_type_orig);
7247 expression_t *true_expression = expression;
7248 bool gnu_cond = false;
7249 if ((c_mode & _GNUC) && token.type == ':') {
7252 true_expression = parse_expression();
7253 rem_anchor_token(':');
7255 expression_t *false_expression = parse_sub_expression(precedence);
7257 type_t *const orig_true_type = true_expression->base.type;
7258 type_t *const orig_false_type = false_expression->base.type;
7259 type_t *const true_type = skip_typeref(orig_true_type);
7260 type_t *const false_type = skip_typeref(orig_false_type);
7263 type_t *result_type;
7264 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7265 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7266 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
7267 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7268 warningf(&conditional->base.source_position,
7269 "ISO C forbids conditional expression with only one void side");
7271 result_type = type_void;
7272 } else if (is_type_arithmetic(true_type)
7273 && is_type_arithmetic(false_type)) {
7274 result_type = semantic_arithmetic(true_type, false_type);
7276 true_expression = create_implicit_cast(true_expression, result_type);
7277 false_expression = create_implicit_cast(false_expression, result_type);
7279 conditional->true_expression = true_expression;
7280 conditional->false_expression = false_expression;
7281 conditional->base.type = result_type;
7282 } else if (same_compound_type(true_type, false_type)) {
7283 /* just take 1 of the 2 types */
7284 result_type = true_type;
7285 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7286 type_t *pointer_type;
7288 expression_t *other_expression;
7289 if (is_type_pointer(true_type) &&
7290 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7291 pointer_type = true_type;
7292 other_type = false_type;
7293 other_expression = false_expression;
7295 pointer_type = false_type;
7296 other_type = true_type;
7297 other_expression = true_expression;
7300 if (is_null_pointer_constant(other_expression)) {
7301 result_type = pointer_type;
7302 } else if (is_type_pointer(other_type)) {
7303 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7304 type_t *to2 = skip_typeref(other_type->pointer.points_to);
7307 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7308 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7310 } else if (types_compatible(get_unqualified_type(to1),
7311 get_unqualified_type(to2))) {
7314 warningf(&conditional->base.source_position,
7315 "pointer types '%T' and '%T' in conditional expression are incompatible",
7316 true_type, false_type);
7320 type_t *const type =
7321 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7322 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7323 } else if (is_type_integer(other_type)) {
7324 warningf(&conditional->base.source_position,
7325 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7326 result_type = pointer_type;
7328 type_error_incompatible("while parsing conditional",
7329 &expression->base.source_position, true_type, false_type);
7330 result_type = type_error_type;
7333 /* TODO: one pointer to void*, other some pointer */
7335 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7336 type_error_incompatible("while parsing conditional",
7337 &conditional->base.source_position, true_type,
7340 result_type = type_error_type;
7343 conditional->true_expression
7344 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7345 conditional->false_expression
7346 = create_implicit_cast(false_expression, result_type);
7347 conditional->base.type = result_type;
7350 return create_invalid_expression();
7354 * Parse an extension expression.
7356 static expression_t *parse_extension(unsigned precedence)
7358 eat(T___extension__);
7360 /* TODO enable extensions */
7361 expression_t *expression = parse_sub_expression(precedence);
7362 /* TODO disable extensions */
7367 * Parse a __builtin_classify_type() expression.
7369 static expression_t *parse_builtin_classify_type(const unsigned precedence)
7371 eat(T___builtin_classify_type);
7373 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7374 result->base.type = type_int;
7377 add_anchor_token(')');
7378 expression_t *expression = parse_sub_expression(precedence);
7379 rem_anchor_token(')');
7381 result->classify_type.type_expression = expression;
7385 return create_invalid_expression();
7388 static bool check_pointer_arithmetic(const source_position_t *source_position,
7389 type_t *pointer_type,
7390 type_t *orig_pointer_type)
7392 type_t *points_to = pointer_type->pointer.points_to;
7393 points_to = skip_typeref(points_to);
7395 if (is_type_incomplete(points_to)) {
7396 if (!(c_mode & _GNUC) || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7397 errorf(source_position,
7398 "arithmetic with pointer to incomplete type '%T' not allowed",
7401 } else if (warning.pointer_arith) {
7402 warningf(source_position,
7403 "pointer of type '%T' used in arithmetic",
7406 } else if (is_type_function(points_to)) {
7407 if (!(c_mode && _GNUC)) {
7408 errorf(source_position,
7409 "arithmetic with pointer to function type '%T' not allowed",
7412 } else if (warning.pointer_arith) {
7413 warningf(source_position,
7414 "pointer to a function '%T' used in arithmetic",
7421 static bool is_lvalue(const expression_t *expression)
7423 switch (expression->kind) {
7424 case EXPR_REFERENCE:
7425 case EXPR_ARRAY_ACCESS:
7427 case EXPR_UNARY_DEREFERENCE:
7435 static void semantic_incdec(unary_expression_t *expression)
7437 type_t *const orig_type = expression->value->base.type;
7438 type_t *const type = skip_typeref(orig_type);
7439 if (is_type_pointer(type)) {
7440 if (!check_pointer_arithmetic(&expression->base.source_position,
7444 } else if (!is_type_real(type) && is_type_valid(type)) {
7445 /* TODO: improve error message */
7446 errorf(&expression->base.source_position,
7447 "operation needs an arithmetic or pointer type");
7450 if (!is_lvalue(expression->value)) {
7451 /* TODO: improve error message */
7452 errorf(&expression->base.source_position, "lvalue required as operand");
7454 expression->base.type = orig_type;
7457 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7459 type_t *const orig_type = expression->value->base.type;
7460 type_t *const type = skip_typeref(orig_type);
7461 if (!is_type_arithmetic(type)) {
7462 if (is_type_valid(type)) {
7463 /* TODO: improve error message */
7464 errorf(&expression->base.source_position,
7465 "operation needs an arithmetic type");
7470 expression->base.type = orig_type;
7473 static void semantic_unexpr_plus(unary_expression_t *expression)
7475 semantic_unexpr_arithmetic(expression);
7476 if (warning.traditional)
7477 warningf(&expression->base.source_position,
7478 "traditional C rejects the unary plus operator");
7481 static void semantic_not(unary_expression_t *expression)
7483 type_t *const orig_type = expression->value->base.type;
7484 type_t *const type = skip_typeref(orig_type);
7485 if (!is_type_scalar(type) && is_type_valid(type)) {
7486 errorf(&expression->base.source_position,
7487 "operand of ! must be of scalar type");
7490 expression->base.type = type_int;
7493 static void semantic_unexpr_integer(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_integer(type)) {
7498 if (is_type_valid(type)) {
7499 errorf(&expression->base.source_position,
7500 "operand of ~ must be of integer type");
7505 expression->base.type = orig_type;
7508 static void semantic_dereference(unary_expression_t *expression)
7510 type_t *const orig_type = expression->value->base.type;
7511 type_t *const type = skip_typeref(orig_type);
7512 if (!is_type_pointer(type)) {
7513 if (is_type_valid(type)) {
7514 errorf(&expression->base.source_position,
7515 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7520 type_t *result_type = type->pointer.points_to;
7521 result_type = automatic_type_conversion(result_type);
7522 expression->base.type = result_type;
7526 * Record that an address is taken (expression represents an lvalue).
7528 * @param expression the expression
7529 * @param may_be_register if true, the expression might be an register
7531 static void set_address_taken(expression_t *expression, bool may_be_register)
7533 if (expression->kind != EXPR_REFERENCE)
7536 declaration_t *const declaration = expression->reference.declaration;
7537 /* happens for parse errors */
7538 if (declaration == NULL)
7541 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
7542 errorf(&expression->base.source_position,
7543 "address of register variable '%Y' requested",
7544 declaration->symbol);
7546 declaration->address_taken = 1;
7551 * Check the semantic of the address taken expression.
7553 static void semantic_take_addr(unary_expression_t *expression)
7555 expression_t *value = expression->value;
7556 value->base.type = revert_automatic_type_conversion(value);
7558 type_t *orig_type = value->base.type;
7559 if (!is_type_valid(orig_type))
7562 set_address_taken(value, false);
7564 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7567 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
7568 static expression_t *parse_##unexpression_type(unsigned precedence) \
7570 expression_t *unary_expression \
7571 = allocate_expression_zero(unexpression_type); \
7572 unary_expression->base.source_position = *HERE; \
7574 unary_expression->unary.value = parse_sub_expression(precedence); \
7576 sfunc(&unary_expression->unary); \
7578 return unary_expression; \
7581 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7582 semantic_unexpr_arithmetic)
7583 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7584 semantic_unexpr_plus)
7585 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7587 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7588 semantic_dereference)
7589 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7591 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7592 semantic_unexpr_integer)
7593 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
7595 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7598 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7600 static expression_t *parse_##unexpression_type(unsigned precedence, \
7601 expression_t *left) \
7603 (void) precedence; \
7605 expression_t *unary_expression \
7606 = allocate_expression_zero(unexpression_type); \
7607 unary_expression->base.source_position = *HERE; \
7609 unary_expression->unary.value = left; \
7611 sfunc(&unary_expression->unary); \
7613 return unary_expression; \
7616 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7617 EXPR_UNARY_POSTFIX_INCREMENT,
7619 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7620 EXPR_UNARY_POSTFIX_DECREMENT,
7623 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7625 /* TODO: handle complex + imaginary types */
7627 type_left = get_unqualified_type(type_left);
7628 type_right = get_unqualified_type(type_right);
7630 /* § 6.3.1.8 Usual arithmetic conversions */
7631 if (type_left == type_long_double || type_right == type_long_double) {
7632 return type_long_double;
7633 } else if (type_left == type_double || type_right == type_double) {
7635 } else if (type_left == type_float || type_right == type_float) {
7639 type_left = promote_integer(type_left);
7640 type_right = promote_integer(type_right);
7642 if (type_left == type_right)
7645 bool const signed_left = is_type_signed(type_left);
7646 bool const signed_right = is_type_signed(type_right);
7647 int const rank_left = get_rank(type_left);
7648 int const rank_right = get_rank(type_right);
7650 if (signed_left == signed_right)
7651 return rank_left >= rank_right ? type_left : type_right;
7660 u_rank = rank_right;
7661 u_type = type_right;
7663 s_rank = rank_right;
7664 s_type = type_right;
7669 if (u_rank >= s_rank)
7672 /* casting rank to atomic_type_kind is a bit hacky, but makes things
7674 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
7675 > get_atomic_type_size((atomic_type_kind_t) u_rank))
7679 case ATOMIC_TYPE_INT: return type_unsigned_int;
7680 case ATOMIC_TYPE_LONG: return type_unsigned_long;
7681 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
7683 default: panic("invalid atomic type");
7688 * Check the semantic restrictions for a binary expression.
7690 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
7692 expression_t *const left = expression->left;
7693 expression_t *const right = expression->right;
7694 type_t *const orig_type_left = left->base.type;
7695 type_t *const orig_type_right = right->base.type;
7696 type_t *const type_left = skip_typeref(orig_type_left);
7697 type_t *const type_right = skip_typeref(orig_type_right);
7699 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7700 /* TODO: improve error message */
7701 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7702 errorf(&expression->base.source_position,
7703 "operation needs arithmetic types");
7708 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7709 expression->left = create_implicit_cast(left, arithmetic_type);
7710 expression->right = create_implicit_cast(right, arithmetic_type);
7711 expression->base.type = arithmetic_type;
7714 static void warn_div_by_zero(binary_expression_t const *const expression)
7716 if (!warning.div_by_zero ||
7717 !is_type_integer(expression->base.type))
7720 expression_t const *const right = expression->right;
7721 /* The type of the right operand can be different for /= */
7722 if (is_type_integer(right->base.type) &&
7723 is_constant_expression(right) &&
7724 fold_constant(right) == 0) {
7725 warningf(&expression->base.source_position, "division by zero");
7730 * Check the semantic restrictions for a div/mod expression.
7732 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
7733 semantic_binexpr_arithmetic(expression);
7734 warn_div_by_zero(expression);
7737 static void semantic_shift_op(binary_expression_t *expression)
7739 expression_t *const left = expression->left;
7740 expression_t *const right = expression->right;
7741 type_t *const orig_type_left = left->base.type;
7742 type_t *const orig_type_right = right->base.type;
7743 type_t * type_left = skip_typeref(orig_type_left);
7744 type_t * type_right = skip_typeref(orig_type_right);
7746 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
7747 /* TODO: improve error message */
7748 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7749 errorf(&expression->base.source_position,
7750 "operands of shift operation must have integer types");
7755 type_left = promote_integer(type_left);
7756 type_right = promote_integer(type_right);
7758 expression->left = create_implicit_cast(left, type_left);
7759 expression->right = create_implicit_cast(right, type_right);
7760 expression->base.type = type_left;
7763 static void semantic_add(binary_expression_t *expression)
7765 expression_t *const left = expression->left;
7766 expression_t *const right = expression->right;
7767 type_t *const orig_type_left = left->base.type;
7768 type_t *const orig_type_right = right->base.type;
7769 type_t *const type_left = skip_typeref(orig_type_left);
7770 type_t *const type_right = skip_typeref(orig_type_right);
7773 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7774 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7775 expression->left = create_implicit_cast(left, arithmetic_type);
7776 expression->right = create_implicit_cast(right, arithmetic_type);
7777 expression->base.type = arithmetic_type;
7779 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7780 check_pointer_arithmetic(&expression->base.source_position,
7781 type_left, orig_type_left);
7782 expression->base.type = type_left;
7783 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
7784 check_pointer_arithmetic(&expression->base.source_position,
7785 type_right, orig_type_right);
7786 expression->base.type = type_right;
7787 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7788 errorf(&expression->base.source_position,
7789 "invalid operands to binary + ('%T', '%T')",
7790 orig_type_left, orig_type_right);
7794 static void semantic_sub(binary_expression_t *expression)
7796 expression_t *const left = expression->left;
7797 expression_t *const right = expression->right;
7798 type_t *const orig_type_left = left->base.type;
7799 type_t *const orig_type_right = right->base.type;
7800 type_t *const type_left = skip_typeref(orig_type_left);
7801 type_t *const type_right = skip_typeref(orig_type_right);
7802 source_position_t const *const pos = &expression->base.source_position;
7805 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7806 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7807 expression->left = create_implicit_cast(left, arithmetic_type);
7808 expression->right = create_implicit_cast(right, arithmetic_type);
7809 expression->base.type = arithmetic_type;
7811 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7812 check_pointer_arithmetic(&expression->base.source_position,
7813 type_left, orig_type_left);
7814 expression->base.type = type_left;
7815 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7816 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
7817 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
7818 if (!types_compatible(unqual_left, unqual_right)) {
7820 "subtracting pointers to incompatible types '%T' and '%T'",
7821 orig_type_left, orig_type_right);
7822 } else if (!is_type_object(unqual_left)) {
7823 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
7824 warningf(pos, "subtracting pointers to void");
7826 errorf(pos, "subtracting pointers to non-object types '%T'",
7830 expression->base.type = type_ptrdiff_t;
7831 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7832 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
7833 orig_type_left, orig_type_right);
7838 * Check the semantics of comparison expressions.
7840 * @param expression The expression to check.
7842 static void semantic_comparison(binary_expression_t *expression)
7844 expression_t *left = expression->left;
7845 expression_t *right = expression->right;
7846 type_t *orig_type_left = left->base.type;
7847 type_t *orig_type_right = right->base.type;
7849 type_t *type_left = skip_typeref(orig_type_left);
7850 type_t *type_right = skip_typeref(orig_type_right);
7852 /* TODO non-arithmetic types */
7853 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7854 /* test for signed vs unsigned compares */
7855 if (warning.sign_compare &&
7856 (expression->base.kind != EXPR_BINARY_EQUAL &&
7857 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
7858 (is_type_signed(type_left) != is_type_signed(type_right))) {
7860 /* check if 1 of the operands is a constant, in this case we just
7861 * check wether we can safely represent the resulting constant in
7862 * the type of the other operand. */
7863 expression_t *const_expr = NULL;
7864 expression_t *other_expr = NULL;
7866 if (is_constant_expression(left)) {
7869 } else if (is_constant_expression(right)) {
7874 if (const_expr != NULL) {
7875 type_t *other_type = skip_typeref(other_expr->base.type);
7876 long val = fold_constant(const_expr);
7877 /* TODO: check if val can be represented by other_type */
7881 warningf(&expression->base.source_position,
7882 "comparison between signed and unsigned");
7884 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7885 expression->left = create_implicit_cast(left, arithmetic_type);
7886 expression->right = create_implicit_cast(right, arithmetic_type);
7887 expression->base.type = arithmetic_type;
7888 if (warning.float_equal &&
7889 (expression->base.kind == EXPR_BINARY_EQUAL ||
7890 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
7891 is_type_float(arithmetic_type)) {
7892 warningf(&expression->base.source_position,
7893 "comparing floating point with == or != is unsafe");
7895 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7896 /* TODO check compatibility */
7897 } else if (is_type_pointer(type_left)) {
7898 expression->right = create_implicit_cast(right, type_left);
7899 } else if (is_type_pointer(type_right)) {
7900 expression->left = create_implicit_cast(left, type_right);
7901 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7902 type_error_incompatible("invalid operands in comparison",
7903 &expression->base.source_position,
7904 type_left, type_right);
7906 expression->base.type = type_int;
7910 * Checks if a compound type has constant fields.
7912 static bool has_const_fields(const compound_type_t *type)
7914 const scope_t *scope = &type->declaration->scope;
7915 const declaration_t *declaration = scope->declarations;
7917 for (; declaration != NULL; declaration = declaration->next) {
7918 if (declaration->namespc != NAMESPACE_NORMAL)
7921 const type_t *decl_type = skip_typeref(declaration->type);
7922 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
7929 static bool is_valid_assignment_lhs(expression_t const* const left)
7931 type_t *const orig_type_left = revert_automatic_type_conversion(left);
7932 type_t *const type_left = skip_typeref(orig_type_left);
7934 if (!is_lvalue(left)) {
7935 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
7940 if (is_type_array(type_left)) {
7941 errorf(HERE, "cannot assign to arrays ('%E')", left);
7944 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
7945 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
7949 if (is_type_incomplete(type_left)) {
7950 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
7951 left, orig_type_left);
7954 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
7955 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
7956 left, orig_type_left);
7963 static void semantic_arithmetic_assign(binary_expression_t *expression)
7965 expression_t *left = expression->left;
7966 expression_t *right = expression->right;
7967 type_t *orig_type_left = left->base.type;
7968 type_t *orig_type_right = right->base.type;
7970 if (!is_valid_assignment_lhs(left))
7973 type_t *type_left = skip_typeref(orig_type_left);
7974 type_t *type_right = skip_typeref(orig_type_right);
7976 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7977 /* TODO: improve error message */
7978 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7979 errorf(&expression->base.source_position,
7980 "operation needs arithmetic types");
7985 /* combined instructions are tricky. We can't create an implicit cast on
7986 * the left side, because we need the uncasted form for the store.
7987 * The ast2firm pass has to know that left_type must be right_type
7988 * for the arithmetic operation and create a cast by itself */
7989 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7990 expression->right = create_implicit_cast(right, arithmetic_type);
7991 expression->base.type = type_left;
7994 static void semantic_divmod_assign(binary_expression_t *expression)
7996 semantic_arithmetic_assign(expression);
7997 warn_div_by_zero(expression);
8000 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
8002 expression_t *const left = expression->left;
8003 expression_t *const right = expression->right;
8004 type_t *const orig_type_left = left->base.type;
8005 type_t *const orig_type_right = right->base.type;
8006 type_t *const type_left = skip_typeref(orig_type_left);
8007 type_t *const type_right = skip_typeref(orig_type_right);
8009 if (!is_valid_assignment_lhs(left))
8012 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8013 /* combined instructions are tricky. We can't create an implicit cast on
8014 * the left side, because we need the uncasted form for the store.
8015 * The ast2firm pass has to know that left_type must be right_type
8016 * for the arithmetic operation and create a cast by itself */
8017 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8018 expression->right = create_implicit_cast(right, arithmetic_type);
8019 expression->base.type = type_left;
8020 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8021 check_pointer_arithmetic(&expression->base.source_position,
8022 type_left, orig_type_left);
8023 expression->base.type = type_left;
8024 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8025 errorf(&expression->base.source_position,
8026 "incompatible types '%T' and '%T' in assignment",
8027 orig_type_left, orig_type_right);
8032 * Check the semantic restrictions of a logical expression.
8034 static void semantic_logical_op(binary_expression_t *expression)
8036 expression_t *const left = expression->left;
8037 expression_t *const right = expression->right;
8038 type_t *const orig_type_left = left->base.type;
8039 type_t *const orig_type_right = right->base.type;
8040 type_t *const type_left = skip_typeref(orig_type_left);
8041 type_t *const type_right = skip_typeref(orig_type_right);
8043 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
8044 /* TODO: improve error message */
8045 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8046 errorf(&expression->base.source_position,
8047 "operation needs scalar types");
8052 expression->base.type = type_int;
8056 * Check the semantic restrictions of a binary assign expression.
8058 static void semantic_binexpr_assign(binary_expression_t *expression)
8060 expression_t *left = expression->left;
8061 type_t *orig_type_left = left->base.type;
8063 if (!is_valid_assignment_lhs(left))
8066 assign_error_t error = semantic_assign(orig_type_left, expression->right);
8067 report_assign_error(error, orig_type_left, expression->right,
8068 "assignment", &left->base.source_position);
8069 expression->right = create_implicit_cast(expression->right, orig_type_left);
8070 expression->base.type = orig_type_left;
8074 * Determine if the outermost operation (or parts thereof) of the given
8075 * expression has no effect in order to generate a warning about this fact.
8076 * Therefore in some cases this only examines some of the operands of the
8077 * expression (see comments in the function and examples below).
8079 * f() + 23; // warning, because + has no effect
8080 * x || f(); // no warning, because x controls execution of f()
8081 * x ? y : f(); // warning, because y has no effect
8082 * (void)x; // no warning to be able to suppress the warning
8083 * This function can NOT be used for an "expression has definitely no effect"-
8085 static bool expression_has_effect(const expression_t *const expr)
8087 switch (expr->kind) {
8088 case EXPR_UNKNOWN: break;
8089 case EXPR_INVALID: return true; /* do NOT warn */
8090 case EXPR_REFERENCE: return false;
8091 /* suppress the warning for microsoft __noop operations */
8092 case EXPR_CONST: return expr->conste.is_ms_noop;
8093 case EXPR_CHARACTER_CONSTANT: return false;
8094 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
8095 case EXPR_STRING_LITERAL: return false;
8096 case EXPR_WIDE_STRING_LITERAL: return false;
8097 case EXPR_LABEL_ADDRESS: return false;
8100 const call_expression_t *const call = &expr->call;
8101 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
8104 switch (call->function->builtin_symbol.symbol->ID) {
8105 case T___builtin_va_end: return true;
8106 default: return false;
8110 /* Generate the warning if either the left or right hand side of a
8111 * conditional expression has no effect */
8112 case EXPR_CONDITIONAL: {
8113 const conditional_expression_t *const cond = &expr->conditional;
8115 expression_has_effect(cond->true_expression) &&
8116 expression_has_effect(cond->false_expression);
8119 case EXPR_SELECT: return false;
8120 case EXPR_ARRAY_ACCESS: return false;
8121 case EXPR_SIZEOF: return false;
8122 case EXPR_CLASSIFY_TYPE: return false;
8123 case EXPR_ALIGNOF: return false;
8125 case EXPR_FUNCNAME: return false;
8126 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
8127 case EXPR_BUILTIN_CONSTANT_P: return false;
8128 case EXPR_BUILTIN_PREFETCH: return true;
8129 case EXPR_OFFSETOF: return false;
8130 case EXPR_VA_START: return true;
8131 case EXPR_VA_ARG: return true;
8132 case EXPR_STATEMENT: return true; // TODO
8133 case EXPR_COMPOUND_LITERAL: return false;
8135 case EXPR_UNARY_NEGATE: return false;
8136 case EXPR_UNARY_PLUS: return false;
8137 case EXPR_UNARY_BITWISE_NEGATE: return false;
8138 case EXPR_UNARY_NOT: return false;
8139 case EXPR_UNARY_DEREFERENCE: return false;
8140 case EXPR_UNARY_TAKE_ADDRESS: return false;
8141 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
8142 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
8143 case EXPR_UNARY_PREFIX_INCREMENT: return true;
8144 case EXPR_UNARY_PREFIX_DECREMENT: return true;
8146 /* Treat void casts as if they have an effect in order to being able to
8147 * suppress the warning */
8148 case EXPR_UNARY_CAST: {
8149 type_t *const type = skip_typeref(expr->base.type);
8150 return is_type_atomic(type, ATOMIC_TYPE_VOID);
8153 case EXPR_UNARY_CAST_IMPLICIT: return true;
8154 case EXPR_UNARY_ASSUME: return true;
8156 case EXPR_BINARY_ADD: return false;
8157 case EXPR_BINARY_SUB: return false;
8158 case EXPR_BINARY_MUL: return false;
8159 case EXPR_BINARY_DIV: return false;
8160 case EXPR_BINARY_MOD: return false;
8161 case EXPR_BINARY_EQUAL: return false;
8162 case EXPR_BINARY_NOTEQUAL: return false;
8163 case EXPR_BINARY_LESS: return false;
8164 case EXPR_BINARY_LESSEQUAL: return false;
8165 case EXPR_BINARY_GREATER: return false;
8166 case EXPR_BINARY_GREATEREQUAL: return false;
8167 case EXPR_BINARY_BITWISE_AND: return false;
8168 case EXPR_BINARY_BITWISE_OR: return false;
8169 case EXPR_BINARY_BITWISE_XOR: return false;
8170 case EXPR_BINARY_SHIFTLEFT: return false;
8171 case EXPR_BINARY_SHIFTRIGHT: return false;
8172 case EXPR_BINARY_ASSIGN: return true;
8173 case EXPR_BINARY_MUL_ASSIGN: return true;
8174 case EXPR_BINARY_DIV_ASSIGN: return true;
8175 case EXPR_BINARY_MOD_ASSIGN: return true;
8176 case EXPR_BINARY_ADD_ASSIGN: return true;
8177 case EXPR_BINARY_SUB_ASSIGN: return true;
8178 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
8179 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
8180 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8181 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8182 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
8184 /* Only examine the right hand side of && and ||, because the left hand
8185 * side already has the effect of controlling the execution of the right
8187 case EXPR_BINARY_LOGICAL_AND:
8188 case EXPR_BINARY_LOGICAL_OR:
8189 /* Only examine the right hand side of a comma expression, because the left
8190 * hand side has a separate warning */
8191 case EXPR_BINARY_COMMA:
8192 return expression_has_effect(expr->binary.right);
8194 case EXPR_BINARY_BUILTIN_EXPECT: return true;
8195 case EXPR_BINARY_ISGREATER: return false;
8196 case EXPR_BINARY_ISGREATEREQUAL: return false;
8197 case EXPR_BINARY_ISLESS: return false;
8198 case EXPR_BINARY_ISLESSEQUAL: return false;
8199 case EXPR_BINARY_ISLESSGREATER: return false;
8200 case EXPR_BINARY_ISUNORDERED: return false;
8203 internal_errorf(HERE, "unexpected expression");
8206 static void semantic_comma(binary_expression_t *expression)
8208 if (warning.unused_value) {
8209 const expression_t *const left = expression->left;
8210 if (!expression_has_effect(left)) {
8211 warningf(&left->base.source_position,
8212 "left-hand operand of comma expression has no effect");
8215 expression->base.type = expression->right->base.type;
8218 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
8219 static expression_t *parse_##binexpression_type(unsigned precedence, \
8220 expression_t *left) \
8222 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8223 binexpr->base.source_position = *HERE; \
8224 binexpr->binary.left = left; \
8227 expression_t *right = parse_sub_expression(precedence + lr); \
8229 binexpr->binary.right = right; \
8230 sfunc(&binexpr->binary); \
8235 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
8236 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
8237 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_divmod_arithmetic, 1)
8238 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_divmod_arithmetic, 1)
8239 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
8240 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
8241 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
8242 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
8243 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
8245 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
8246 semantic_comparison, 1)
8247 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
8248 semantic_comparison, 1)
8249 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
8250 semantic_comparison, 1)
8251 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
8252 semantic_comparison, 1)
8254 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
8255 semantic_binexpr_arithmetic, 1)
8256 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
8257 semantic_binexpr_arithmetic, 1)
8258 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
8259 semantic_binexpr_arithmetic, 1)
8260 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
8261 semantic_logical_op, 1)
8262 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
8263 semantic_logical_op, 1)
8264 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
8265 semantic_shift_op, 1)
8266 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
8267 semantic_shift_op, 1)
8268 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
8269 semantic_arithmetic_addsubb_assign, 0)
8270 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
8271 semantic_arithmetic_addsubb_assign, 0)
8272 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
8273 semantic_arithmetic_assign, 0)
8274 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
8275 semantic_divmod_assign, 0)
8276 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
8277 semantic_divmod_assign, 0)
8278 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
8279 semantic_arithmetic_assign, 0)
8280 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8281 semantic_arithmetic_assign, 0)
8282 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
8283 semantic_arithmetic_assign, 0)
8284 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
8285 semantic_arithmetic_assign, 0)
8286 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
8287 semantic_arithmetic_assign, 0)
8289 static expression_t *parse_sub_expression(unsigned precedence)
8291 if (token.type < 0) {
8292 return expected_expression_error();
8295 expression_parser_function_t *parser
8296 = &expression_parsers[token.type];
8297 source_position_t source_position = token.source_position;
8300 if (parser->parser != NULL) {
8301 left = parser->parser(parser->precedence);
8303 left = parse_primary_expression();
8305 assert(left != NULL);
8306 left->base.source_position = source_position;
8309 if (token.type < 0) {
8310 return expected_expression_error();
8313 parser = &expression_parsers[token.type];
8314 if (parser->infix_parser == NULL)
8316 if (parser->infix_precedence < precedence)
8319 left = parser->infix_parser(parser->infix_precedence, left);
8321 assert(left != NULL);
8322 assert(left->kind != EXPR_UNKNOWN);
8323 left->base.source_position = source_position;
8330 * Parse an expression.
8332 static expression_t *parse_expression(void)
8334 return parse_sub_expression(1);
8338 * Register a parser for a prefix-like operator with given precedence.
8340 * @param parser the parser function
8341 * @param token_type the token type of the prefix token
8342 * @param precedence the precedence of the operator
8344 static void register_expression_parser(parse_expression_function parser,
8345 int token_type, unsigned precedence)
8347 expression_parser_function_t *entry = &expression_parsers[token_type];
8349 if (entry->parser != NULL) {
8350 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8351 panic("trying to register multiple expression parsers for a token");
8353 entry->parser = parser;
8354 entry->precedence = precedence;
8358 * Register a parser for an infix operator with given precedence.
8360 * @param parser the parser function
8361 * @param token_type the token type of the infix operator
8362 * @param precedence the precedence of the operator
8364 static void register_infix_parser(parse_expression_infix_function parser,
8365 int token_type, unsigned precedence)
8367 expression_parser_function_t *entry = &expression_parsers[token_type];
8369 if (entry->infix_parser != NULL) {
8370 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8371 panic("trying to register multiple infix expression parsers for a "
8374 entry->infix_parser = parser;
8375 entry->infix_precedence = precedence;
8379 * Initialize the expression parsers.
8381 static void init_expression_parsers(void)
8383 memset(&expression_parsers, 0, sizeof(expression_parsers));
8385 register_infix_parser(parse_array_expression, '[', 30);
8386 register_infix_parser(parse_call_expression, '(', 30);
8387 register_infix_parser(parse_select_expression, '.', 30);
8388 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
8389 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
8391 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
8394 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
8395 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
8396 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
8397 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
8398 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
8399 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
8400 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
8401 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
8402 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
8403 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
8404 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
8405 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
8406 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
8407 T_EXCLAMATIONMARKEQUAL, 13);
8408 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
8409 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
8410 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
8411 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
8412 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
8413 register_infix_parser(parse_conditional_expression, '?', 7);
8414 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
8415 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
8416 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
8417 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
8418 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
8419 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
8420 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
8421 T_LESSLESSEQUAL, 2);
8422 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8423 T_GREATERGREATEREQUAL, 2);
8424 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
8426 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
8428 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
8431 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
8433 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
8434 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
8435 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
8436 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
8437 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
8438 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
8439 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
8441 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
8443 register_expression_parser(parse_sizeof, T_sizeof, 25);
8444 register_expression_parser(parse_alignof, T___alignof__, 25);
8445 register_expression_parser(parse_extension, T___extension__, 25);
8446 register_expression_parser(parse_builtin_classify_type,
8447 T___builtin_classify_type, 25);
8451 * Parse a asm statement arguments specification.
8453 static asm_argument_t *parse_asm_arguments(bool is_out)
8455 asm_argument_t *result = NULL;
8456 asm_argument_t *last = NULL;
8458 while (token.type == T_STRING_LITERAL || token.type == '[') {
8459 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8460 memset(argument, 0, sizeof(argument[0]));
8462 if (token.type == '[') {
8464 if (token.type != T_IDENTIFIER) {
8465 parse_error_expected("while parsing asm argument",
8466 T_IDENTIFIER, NULL);
8469 argument->symbol = token.v.symbol;
8474 argument->constraints = parse_string_literals();
8476 add_anchor_token(')');
8477 expression_t *expression = parse_expression();
8478 rem_anchor_token(')');
8480 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
8481 * change size or type representation (e.g. int -> long is ok, but
8482 * int -> float is not) */
8483 if (expression->kind == EXPR_UNARY_CAST) {
8484 type_t *const type = expression->base.type;
8485 type_kind_t const kind = type->kind;
8486 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8489 if (kind == TYPE_ATOMIC) {
8490 atomic_type_kind_t const akind = type->atomic.akind;
8491 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8492 size = get_atomic_type_size(akind);
8494 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8495 size = get_atomic_type_size(get_intptr_kind());
8499 expression_t *const value = expression->unary.value;
8500 type_t *const value_type = value->base.type;
8501 type_kind_t const value_kind = value_type->kind;
8503 unsigned value_flags;
8504 unsigned value_size;
8505 if (value_kind == TYPE_ATOMIC) {
8506 atomic_type_kind_t const value_akind = value_type->atomic.akind;
8507 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8508 value_size = get_atomic_type_size(value_akind);
8509 } else if (value_kind == TYPE_POINTER) {
8510 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8511 value_size = get_atomic_type_size(get_intptr_kind());
8516 if (value_flags != flags || value_size != size)
8520 } while (expression->kind == EXPR_UNARY_CAST);
8524 if (!is_lvalue(expression)) {
8525 errorf(&expression->base.source_position,
8526 "asm output argument is not an lvalue");
8529 argument->expression = expression;
8532 set_address_taken(expression, true);
8535 last->next = argument;
8541 if (token.type != ',')
8552 * Parse a asm statement clobber specification.
8554 static asm_clobber_t *parse_asm_clobbers(void)
8556 asm_clobber_t *result = NULL;
8557 asm_clobber_t *last = NULL;
8559 while(token.type == T_STRING_LITERAL) {
8560 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
8561 clobber->clobber = parse_string_literals();
8564 last->next = clobber;
8570 if (token.type != ',')
8579 * Parse an asm statement.
8581 static statement_t *parse_asm_statement(void)
8585 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8586 statement->base.source_position = token.source_position;
8588 asm_statement_t *asm_statement = &statement->asms;
8590 if (token.type == T_volatile) {
8592 asm_statement->is_volatile = true;
8596 add_anchor_token(')');
8597 add_anchor_token(':');
8598 asm_statement->asm_text = parse_string_literals();
8600 if (token.type != ':') {
8601 rem_anchor_token(':');
8606 asm_statement->outputs = parse_asm_arguments(true);
8607 if (token.type != ':') {
8608 rem_anchor_token(':');
8613 asm_statement->inputs = parse_asm_arguments(false);
8614 if (token.type != ':') {
8615 rem_anchor_token(':');
8618 rem_anchor_token(':');
8621 asm_statement->clobbers = parse_asm_clobbers();
8624 rem_anchor_token(')');
8628 if (asm_statement->outputs == NULL) {
8629 /* GCC: An 'asm' instruction without any output operands will be treated
8630 * identically to a volatile 'asm' instruction. */
8631 asm_statement->is_volatile = true;
8636 return create_invalid_statement();
8640 * Parse a case statement.
8642 static statement_t *parse_case_statement(void)
8646 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8647 source_position_t *const pos = &statement->base.source_position;
8649 *pos = token.source_position;
8650 expression_t *const expression = parse_expression();
8651 statement->case_label.expression = expression;
8652 if (!is_constant_expression(expression)) {
8653 /* This check does not prevent the error message in all cases of an
8654 * prior error while parsing the expression. At least it catches the
8655 * common case of a mistyped enum entry. */
8656 if (is_type_valid(expression->base.type)) {
8657 errorf(pos, "case label does not reduce to an integer constant");
8659 statement->case_label.is_bad = true;
8661 long const val = fold_constant(expression);
8662 statement->case_label.first_case = val;
8663 statement->case_label.last_case = val;
8666 if (c_mode & _GNUC) {
8667 if (token.type == T_DOTDOTDOT) {
8669 expression_t *const end_range = parse_expression();
8670 statement->case_label.end_range = end_range;
8671 if (!is_constant_expression(end_range)) {
8672 /* This check does not prevent the error message in all cases of an
8673 * prior error while parsing the expression. At least it catches the
8674 * common case of a mistyped enum entry. */
8675 if (is_type_valid(end_range->base.type)) {
8676 errorf(pos, "case range does not reduce to an integer constant");
8678 statement->case_label.is_bad = true;
8680 long const val = fold_constant(end_range);
8681 statement->case_label.last_case = val;
8683 if (val < statement->case_label.first_case) {
8684 statement->case_label.is_empty_range = true;
8685 warningf(pos, "empty range specified");
8691 PUSH_PARENT(statement);
8695 if (current_switch != NULL) {
8696 if (! statement->case_label.is_bad) {
8697 /* Check for duplicate case values */
8698 case_label_statement_t *c = &statement->case_label;
8699 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
8700 if (l->is_bad || l->is_empty_range || l->expression == NULL)
8703 if (c->last_case < l->first_case || c->first_case > l->last_case)
8706 errorf(pos, "duplicate case value (previously used %P)",
8707 &l->base.source_position);
8711 /* link all cases into the switch statement */
8712 if (current_switch->last_case == NULL) {
8713 current_switch->first_case = &statement->case_label;
8715 current_switch->last_case->next = &statement->case_label;
8717 current_switch->last_case = &statement->case_label;
8719 errorf(pos, "case label not within a switch statement");
8722 statement_t *const inner_stmt = parse_statement();
8723 statement->case_label.statement = inner_stmt;
8724 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8725 errorf(&inner_stmt->base.source_position, "declaration after case label");
8732 return create_invalid_statement();
8736 * Parse a default statement.
8738 static statement_t *parse_default_statement(void)
8742 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8743 statement->base.source_position = token.source_position;
8745 PUSH_PARENT(statement);
8748 if (current_switch != NULL) {
8749 const case_label_statement_t *def_label = current_switch->default_label;
8750 if (def_label != NULL) {
8751 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
8752 &def_label->base.source_position);
8754 current_switch->default_label = &statement->case_label;
8756 /* link all cases into the switch statement */
8757 if (current_switch->last_case == NULL) {
8758 current_switch->first_case = &statement->case_label;
8760 current_switch->last_case->next = &statement->case_label;
8762 current_switch->last_case = &statement->case_label;
8765 errorf(&statement->base.source_position,
8766 "'default' label not within a switch statement");
8769 statement_t *const inner_stmt = parse_statement();
8770 statement->case_label.statement = inner_stmt;
8771 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8772 errorf(&inner_stmt->base.source_position, "declaration after default label");
8779 return create_invalid_statement();
8783 * Parse a label statement.
8785 static statement_t *parse_label_statement(void)
8787 assert(token.type == T_IDENTIFIER);
8788 symbol_t *symbol = token.v.symbol;
8791 declaration_t *label = get_label(symbol);
8793 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
8794 statement->base.source_position = token.source_position;
8795 statement->label.label = label;
8797 PUSH_PARENT(statement);
8799 /* if statement is already set then the label is defined twice,
8800 * otherwise it was just mentioned in a goto/local label declaration so far */
8801 if (label->init.statement != NULL) {
8802 errorf(HERE, "duplicate label '%Y' (declared %P)",
8803 symbol, &label->source_position);
8805 label->source_position = token.source_position;
8806 label->init.statement = statement;
8811 if (token.type == '}') {
8812 /* TODO only warn? */
8814 warningf(HERE, "label at end of compound statement");
8815 statement->label.statement = create_empty_statement();
8817 errorf(HERE, "label at end of compound statement");
8818 statement->label.statement = create_invalid_statement();
8820 } else if (token.type == ';') {
8821 /* Eat an empty statement here, to avoid the warning about an empty
8822 * statement after a label. label:; is commonly used to have a label
8823 * before a closing brace. */
8824 statement->label.statement = create_empty_statement();
8827 statement_t *const inner_stmt = parse_statement();
8828 statement->label.statement = inner_stmt;
8829 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8830 errorf(&inner_stmt->base.source_position, "declaration after label");
8834 /* remember the labels in a list for later checking */
8835 if (label_last == NULL) {
8836 label_first = &statement->label;
8838 label_last->next = &statement->label;
8840 label_last = &statement->label;
8847 * Parse an if statement.
8849 static statement_t *parse_if(void)
8853 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
8854 statement->base.source_position = token.source_position;
8856 PUSH_PARENT(statement);
8859 add_anchor_token(')');
8860 statement->ifs.condition = parse_expression();
8861 rem_anchor_token(')');
8864 add_anchor_token(T_else);
8865 statement->ifs.true_statement = parse_statement();
8866 rem_anchor_token(T_else);
8868 if (token.type == T_else) {
8870 statement->ifs.false_statement = parse_statement();
8877 return create_invalid_statement();
8881 * Check that all enums are handled in a switch.
8883 * @param statement the switch statement to check
8885 static void check_enum_cases(const switch_statement_t *statement) {
8886 const type_t *type = skip_typeref(statement->expression->base.type);
8887 if (! is_type_enum(type))
8889 const enum_type_t *enumt = &type->enumt;
8891 /* if we have a default, no warnings */
8892 if (statement->default_label != NULL)
8895 /* FIXME: calculation of value should be done while parsing */
8896 const declaration_t *declaration;
8897 long last_value = -1;
8898 for (declaration = enumt->declaration->next;
8899 declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY;
8900 declaration = declaration->next) {
8901 const expression_t *expression = declaration->init.enum_value;
8902 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
8904 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
8905 if (l->expression == NULL)
8907 if (l->first_case <= value && value <= l->last_case) {
8913 warningf(&statement->base.source_position,
8914 "enumeration value '%Y' not handled in switch", declaration->symbol);
8921 * Parse a switch statement.
8923 static statement_t *parse_switch(void)
8927 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
8928 statement->base.source_position = token.source_position;
8930 PUSH_PARENT(statement);
8933 add_anchor_token(')');
8934 expression_t *const expr = parse_expression();
8935 type_t * type = skip_typeref(expr->base.type);
8936 if (is_type_integer(type)) {
8937 type = promote_integer(type);
8938 if (warning.traditional) {
8939 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
8940 warningf(&expr->base.source_position,
8941 "'%T' switch expression not converted to '%T' in ISO C",
8945 } else if (is_type_valid(type)) {
8946 errorf(&expr->base.source_position,
8947 "switch quantity is not an integer, but '%T'", type);
8948 type = type_error_type;
8950 statement->switchs.expression = create_implicit_cast(expr, type);
8952 rem_anchor_token(')');
8954 switch_statement_t *rem = current_switch;
8955 current_switch = &statement->switchs;
8956 statement->switchs.body = parse_statement();
8957 current_switch = rem;
8959 if (warning.switch_default &&
8960 statement->switchs.default_label == NULL) {
8961 warningf(&statement->base.source_position, "switch has no default case");
8963 if (warning.switch_enum)
8964 check_enum_cases(&statement->switchs);
8970 return create_invalid_statement();
8973 static statement_t *parse_loop_body(statement_t *const loop)
8975 statement_t *const rem = current_loop;
8976 current_loop = loop;
8978 statement_t *const body = parse_statement();
8985 * Parse a while statement.
8987 static statement_t *parse_while(void)
8991 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
8992 statement->base.source_position = token.source_position;
8994 PUSH_PARENT(statement);
8997 add_anchor_token(')');
8998 statement->whiles.condition = parse_expression();
8999 rem_anchor_token(')');
9002 statement->whiles.body = parse_loop_body(statement);
9008 return create_invalid_statement();
9012 * Parse a do statement.
9014 static statement_t *parse_do(void)
9018 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9019 statement->base.source_position = token.source_position;
9021 PUSH_PARENT(statement)
9023 add_anchor_token(T_while);
9024 statement->do_while.body = parse_loop_body(statement);
9025 rem_anchor_token(T_while);
9029 add_anchor_token(')');
9030 statement->do_while.condition = parse_expression();
9031 rem_anchor_token(')');
9039 return create_invalid_statement();
9043 * Parse a for statement.
9045 static statement_t *parse_for(void)
9049 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9050 statement->base.source_position = token.source_position;
9052 PUSH_PARENT(statement);
9054 int top = environment_top();
9055 scope_t *last_scope = scope;
9056 set_scope(&statement->fors.scope);
9059 add_anchor_token(')');
9061 if (token.type != ';') {
9062 if (is_declaration_specifier(&token, false)) {
9063 parse_declaration(record_declaration);
9065 add_anchor_token(';');
9066 expression_t *const init = parse_expression();
9067 statement->fors.initialisation = init;
9068 if (warning.unused_value && !expression_has_effect(init)) {
9069 warningf(&init->base.source_position,
9070 "initialisation of 'for'-statement has no effect");
9072 rem_anchor_token(';');
9079 if (token.type != ';') {
9080 add_anchor_token(';');
9081 statement->fors.condition = parse_expression();
9082 rem_anchor_token(';');
9085 if (token.type != ')') {
9086 expression_t *const step = parse_expression();
9087 statement->fors.step = step;
9088 if (warning.unused_value && !expression_has_effect(step)) {
9089 warningf(&step->base.source_position,
9090 "step of 'for'-statement has no effect");
9093 rem_anchor_token(')');
9095 statement->fors.body = parse_loop_body(statement);
9097 assert(scope == &statement->fors.scope);
9098 set_scope(last_scope);
9099 environment_pop_to(top);
9106 rem_anchor_token(')');
9107 assert(scope == &statement->fors.scope);
9108 set_scope(last_scope);
9109 environment_pop_to(top);
9111 return create_invalid_statement();
9115 * Parse a goto statement.
9117 static statement_t *parse_goto(void)
9119 source_position_t source_position = token.source_position;
9122 statement_t *statement;
9123 if (c_mode & _GNUC && token.type == '*') {
9125 expression_t *expression = parse_expression();
9127 /* Argh: although documentation say the expression must be of type void *,
9128 * gcc excepts anything that can be casted into void * without error */
9129 type_t *type = expression->base.type;
9131 if (type != type_error_type) {
9132 if (!is_type_pointer(type) && !is_type_integer(type)) {
9133 errorf(&source_position, "cannot convert to a pointer type");
9134 } else if (type != type_void_ptr) {
9135 warningf(&source_position,
9136 "type of computed goto expression should be 'void*' not '%T'", type);
9138 expression = create_implicit_cast(expression, type_void_ptr);
9141 statement = allocate_statement_zero(STATEMENT_GOTO);
9142 statement->base.source_position = source_position;
9143 statement->gotos.expression = expression;
9145 if (token.type != T_IDENTIFIER) {
9147 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9149 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9153 symbol_t *symbol = token.v.symbol;
9156 statement = allocate_statement_zero(STATEMENT_GOTO);
9157 statement->base.source_position = source_position;
9158 statement->gotos.label = get_label(symbol);
9161 /* remember the goto's in a list for later checking */
9162 if (goto_last == NULL) {
9163 goto_first = &statement->gotos;
9165 goto_last->next = &statement->gotos;
9167 goto_last = &statement->gotos;
9173 return create_invalid_statement();
9177 * Parse a continue statement.
9179 static statement_t *parse_continue(void)
9181 if (current_loop == NULL) {
9182 errorf(HERE, "continue statement not within loop");
9185 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9186 statement->base.source_position = token.source_position;
9196 * Parse a break statement.
9198 static statement_t *parse_break(void)
9200 if (current_switch == NULL && current_loop == NULL) {
9201 errorf(HERE, "break statement not within loop or switch");
9204 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9205 statement->base.source_position = token.source_position;
9215 * Parse a __leave statement.
9217 static statement_t *parse_leave_statement(void)
9219 if (current_try == NULL) {
9220 errorf(HERE, "__leave statement not within __try");
9223 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9224 statement->base.source_position = token.source_position;
9234 * Check if a given declaration represents a local variable.
9236 static bool is_local_var_declaration(const declaration_t *declaration)
9238 switch ((storage_class_tag_t) declaration->storage_class) {
9239 case STORAGE_CLASS_AUTO:
9240 case STORAGE_CLASS_REGISTER: {
9241 const type_t *type = skip_typeref(declaration->type);
9242 if (is_type_function(type)) {
9254 * Check if a given declaration represents a variable.
9256 static bool is_var_declaration(const declaration_t *declaration)
9258 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
9261 const type_t *type = skip_typeref(declaration->type);
9262 return !is_type_function(type);
9266 * Check if a given expression represents a local variable.
9268 static bool is_local_variable(const expression_t *expression)
9270 if (expression->base.kind != EXPR_REFERENCE) {
9273 const declaration_t *declaration = expression->reference.declaration;
9274 return is_local_var_declaration(declaration);
9278 * Check if a given expression represents a local variable and
9279 * return its declaration then, else return NULL.
9281 declaration_t *expr_is_variable(const expression_t *expression)
9283 if (expression->base.kind != EXPR_REFERENCE) {
9286 declaration_t *declaration = expression->reference.declaration;
9287 if (is_var_declaration(declaration))
9293 * Parse a return statement.
9295 static statement_t *parse_return(void)
9297 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9298 statement->base.source_position = token.source_position;
9302 expression_t *return_value = NULL;
9303 if (token.type != ';') {
9304 return_value = parse_expression();
9307 const type_t *const func_type = current_function->type;
9308 assert(is_type_function(func_type));
9309 type_t *const return_type = skip_typeref(func_type->function.return_type);
9311 if (return_value != NULL) {
9312 type_t *return_value_type = skip_typeref(return_value->base.type);
9314 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
9315 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9316 warningf(&statement->base.source_position,
9317 "'return' with a value, in function returning void");
9318 return_value = NULL;
9320 assign_error_t error = semantic_assign(return_type, return_value);
9321 report_assign_error(error, return_type, return_value, "'return'",
9322 &statement->base.source_position);
9323 return_value = create_implicit_cast(return_value, return_type);
9325 /* check for returning address of a local var */
9326 if (return_value != NULL &&
9327 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9328 const expression_t *expression = return_value->unary.value;
9329 if (is_local_variable(expression)) {
9330 warningf(&statement->base.source_position,
9331 "function returns address of local variable");
9335 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9336 warningf(&statement->base.source_position,
9337 "'return' without value, in function returning non-void");
9340 statement->returns.value = return_value;
9349 * Parse a declaration statement.
9351 static statement_t *parse_declaration_statement(void)
9353 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9355 statement->base.source_position = token.source_position;
9357 declaration_t *before = last_declaration;
9358 parse_declaration(record_declaration);
9360 if (before == NULL) {
9361 statement->declaration.declarations_begin = scope->declarations;
9363 statement->declaration.declarations_begin = before->next;
9365 statement->declaration.declarations_end = last_declaration;
9371 * Parse an expression statement, ie. expr ';'.
9373 static statement_t *parse_expression_statement(void)
9375 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9377 statement->base.source_position = token.source_position;
9378 expression_t *const expr = parse_expression();
9379 statement->expression.expression = expr;
9388 * Parse a microsoft __try { } __finally { } or
9389 * __try{ } __except() { }
9391 static statement_t *parse_ms_try_statment(void)
9393 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9394 statement->base.source_position = token.source_position;
9397 PUSH_PARENT(statement);
9399 ms_try_statement_t *rem = current_try;
9400 current_try = &statement->ms_try;
9401 statement->ms_try.try_statement = parse_compound_statement(false);
9406 if (token.type == T___except) {
9409 add_anchor_token(')');
9410 expression_t *const expr = parse_expression();
9411 type_t * type = skip_typeref(expr->base.type);
9412 if (is_type_integer(type)) {
9413 type = promote_integer(type);
9414 } else if (is_type_valid(type)) {
9415 errorf(&expr->base.source_position,
9416 "__expect expression is not an integer, but '%T'", type);
9417 type = type_error_type;
9419 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9420 rem_anchor_token(')');
9422 statement->ms_try.final_statement = parse_compound_statement(false);
9423 } else if (token.type == T__finally) {
9425 statement->ms_try.final_statement = parse_compound_statement(false);
9427 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9428 return create_invalid_statement();
9432 return create_invalid_statement();
9435 static statement_t *parse_empty_statement(void)
9437 if (warning.empty_statement) {
9438 warningf(HERE, "statement is empty");
9440 statement_t *const statement = create_empty_statement();
9445 static statement_t *parse_local_label_declaration(void) {
9446 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9447 statement->base.source_position = token.source_position;
9451 declaration_t *begin = NULL, *end = NULL;
9454 if (token.type != T_IDENTIFIER) {
9455 parse_error_expected("while parsing local label declaration",
9456 T_IDENTIFIER, NULL);
9459 symbol_t *symbol = token.v.symbol;
9460 declaration_t *declaration = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
9461 if (declaration != NULL) {
9462 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition at %P)",
9463 symbol, &declaration->source_position);
9465 declaration = allocate_declaration_zero();
9466 declaration->namespc = NAMESPACE_LOCAL_LABEL;
9467 declaration->source_position = token.source_position;
9468 declaration->symbol = symbol;
9469 declaration->parent_scope = scope;
9470 declaration->init.statement = NULL;
9473 end->next = declaration;
9476 begin = declaration;
9478 local_label_push(declaration);
9482 if (token.type != ',')
9488 statement->declaration.declarations_begin = begin;
9489 statement->declaration.declarations_end = end;
9494 * Parse a statement.
9495 * There's also parse_statement() which additionally checks for
9496 * "statement has no effect" warnings
9498 static statement_t *intern_parse_statement(void)
9500 statement_t *statement = NULL;
9502 /* declaration or statement */
9503 add_anchor_token(';');
9504 switch (token.type) {
9505 case T_IDENTIFIER: {
9506 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9507 if (la1_type == ':') {
9508 statement = parse_label_statement();
9509 } else if (is_typedef_symbol(token.v.symbol)) {
9510 statement = parse_declaration_statement();
9511 } else switch (la1_type) {
9513 if (get_declaration(token.v.symbol, NAMESPACE_NORMAL) != NULL)
9514 goto expression_statment;
9519 statement = parse_declaration_statement();
9523 expression_statment:
9524 statement = parse_expression_statement();
9530 case T___extension__:
9531 /* This can be a prefix to a declaration or an expression statement.
9532 * We simply eat it now and parse the rest with tail recursion. */
9535 } while (token.type == T___extension__);
9536 statement = parse_statement();
9540 statement = parse_declaration_statement();
9544 statement = parse_local_label_declaration();
9547 case ';': statement = parse_empty_statement(); break;
9548 case '{': statement = parse_compound_statement(false); break;
9549 case T___leave: statement = parse_leave_statement(); break;
9550 case T___try: statement = parse_ms_try_statment(); break;
9551 case T_asm: statement = parse_asm_statement(); break;
9552 case T_break: statement = parse_break(); break;
9553 case T_case: statement = parse_case_statement(); break;
9554 case T_continue: statement = parse_continue(); break;
9555 case T_default: statement = parse_default_statement(); break;
9556 case T_do: statement = parse_do(); break;
9557 case T_for: statement = parse_for(); break;
9558 case T_goto: statement = parse_goto(); break;
9559 case T_if: statement = parse_if (); break;
9560 case T_return: statement = parse_return(); break;
9561 case T_switch: statement = parse_switch(); break;
9562 case T_while: statement = parse_while(); break;
9572 case T_CHARACTER_CONSTANT:
9573 case T_FLOATINGPOINT:
9577 case T_STRING_LITERAL:
9578 case T_WIDE_CHARACTER_CONSTANT:
9579 case T_WIDE_STRING_LITERAL:
9580 case T___FUNCDNAME__:
9582 case T___FUNCTION__:
9583 case T___PRETTY_FUNCTION__:
9584 case T___builtin_alloca:
9585 case T___builtin_classify_type:
9586 case T___builtin_constant_p:
9587 case T___builtin_expect:
9588 case T___builtin_huge_val:
9589 case T___builtin_isgreater:
9590 case T___builtin_isgreaterequal:
9591 case T___builtin_isless:
9592 case T___builtin_islessequal:
9593 case T___builtin_islessgreater:
9594 case T___builtin_isunordered:
9595 case T___builtin_nan:
9596 case T___builtin_nand:
9597 case T___builtin_nanf:
9598 case T___builtin_offsetof:
9599 case T___builtin_prefetch:
9600 case T___builtin_va_arg:
9601 case T___builtin_va_end:
9602 case T___builtin_va_start:
9606 statement = parse_expression_statement();
9610 errorf(HERE, "unexpected token %K while parsing statement", &token);
9611 statement = create_invalid_statement();
9616 rem_anchor_token(';');
9618 assert(statement != NULL
9619 && statement->base.source_position.input_name != NULL);
9625 * parse a statement and emits "statement has no effect" warning if needed
9626 * (This is really a wrapper around intern_parse_statement with check for 1
9627 * single warning. It is needed, because for statement expressions we have
9628 * to avoid the warning on the last statement)
9630 static statement_t *parse_statement(void)
9632 statement_t *statement = intern_parse_statement();
9634 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
9635 expression_t *expression = statement->expression.expression;
9636 if (!expression_has_effect(expression)) {
9637 warningf(&expression->base.source_position,
9638 "statement has no effect");
9646 * Parse a compound statement.
9648 static statement_t *parse_compound_statement(bool inside_expression_statement)
9650 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
9651 statement->base.source_position = token.source_position;
9653 PUSH_PARENT(statement);
9656 add_anchor_token('}');
9658 int top = environment_top();
9659 int top_local = local_label_top();
9660 scope_t *last_scope = scope;
9661 set_scope(&statement->compound.scope);
9663 statement_t **anchor = &statement->compound.statements;
9664 bool only_decls_so_far = true;
9665 while (token.type != '}' && token.type != T_EOF) {
9666 statement_t *sub_statement = intern_parse_statement();
9667 if (is_invalid_statement(sub_statement)) {
9668 /* an error occurred. if we are at an anchor, return */
9674 if (warning.declaration_after_statement) {
9675 if (sub_statement->kind != STATEMENT_DECLARATION) {
9676 only_decls_so_far = false;
9677 } else if (!only_decls_so_far) {
9678 warningf(&sub_statement->base.source_position,
9679 "ISO C90 forbids mixed declarations and code");
9683 *anchor = sub_statement;
9685 while (sub_statement->base.next != NULL)
9686 sub_statement = sub_statement->base.next;
9688 anchor = &sub_statement->base.next;
9691 if (token.type == '}') {
9694 errorf(&statement->base.source_position,
9695 "end of file while looking for closing '}'");
9698 /* look over all statements again to produce no effect warnings */
9699 if (warning.unused_value) {
9700 statement_t *sub_statement = statement->compound.statements;
9701 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
9702 if (sub_statement->kind != STATEMENT_EXPRESSION)
9704 /* don't emit a warning for the last expression in an expression
9705 * statement as it has always an effect */
9706 if (inside_expression_statement && sub_statement->base.next == NULL)
9709 expression_t *expression = sub_statement->expression.expression;
9710 if (!expression_has_effect(expression)) {
9711 warningf(&expression->base.source_position,
9712 "statement has no effect");
9718 rem_anchor_token('}');
9719 assert(scope == &statement->compound.scope);
9720 set_scope(last_scope);
9721 environment_pop_to(top);
9722 local_label_pop_to(top_local);
9729 * Initialize builtin types.
9731 static void initialize_builtin_types(void)
9733 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
9734 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
9735 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
9736 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
9737 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
9738 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
9739 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", opt_short_wchar_t ? type_unsigned_short : type_int);
9740 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
9742 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
9743 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
9744 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
9745 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
9747 /* const version of wchar_t */
9748 type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
9749 type_const_wchar_t->typedeft.declaration = type_wchar_t->typedeft.declaration;
9750 type_const_wchar_t->base.qualifiers |= TYPE_QUALIFIER_CONST;
9752 type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE);
9756 * Check for unused global static functions and variables
9758 static void check_unused_globals(void)
9760 if (!warning.unused_function && !warning.unused_variable)
9763 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
9765 decl->modifiers & DM_UNUSED ||
9766 decl->modifiers & DM_USED ||
9767 decl->storage_class != STORAGE_CLASS_STATIC)
9770 type_t *const type = decl->type;
9772 if (is_type_function(skip_typeref(type))) {
9773 if (!warning.unused_function || decl->is_inline)
9776 s = (decl->init.statement != NULL ? "defined" : "declared");
9778 if (!warning.unused_variable)
9784 warningf(&decl->source_position, "'%#T' %s but not used",
9785 type, decl->symbol, s);
9789 static void parse_global_asm(void)
9794 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9795 statement->base.source_position = token.source_position;
9796 statement->asms.asm_text = parse_string_literals();
9797 statement->base.next = unit->global_asm;
9798 unit->global_asm = statement;
9807 * Parse a translation unit.
9809 static void parse_translation_unit(void)
9813 bool anchor_leak = false;
9814 for (token_type_t i = 0; i != T_LAST_TOKEN; ++i) {
9815 unsigned char count = token_anchor_set[i];
9817 errorf(HERE, "Leaked anchor token %k %d times", i, count);
9825 switch (token.type) {
9828 case T___extension__:
9829 parse_external_declaration();
9840 /* TODO error in strict mode */
9841 warningf(HERE, "stray ';' outside of function");
9846 errorf(HERE, "stray %K outside of function", &token);
9847 if (token.type == '(' || token.type == '{' || token.type == '[')
9848 eat_until_matching_token(token.type);
9858 * @return the translation unit or NULL if errors occurred.
9860 void start_parsing(void)
9862 environment_stack = NEW_ARR_F(stack_entry_t, 0);
9863 label_stack = NEW_ARR_F(stack_entry_t, 0);
9864 local_label_stack = NEW_ARR_F(stack_entry_t, 0);
9865 diagnostic_count = 0;
9869 type_set_output(stderr);
9870 ast_set_output(stderr);
9872 assert(unit == NULL);
9873 unit = allocate_ast_zero(sizeof(unit[0]));
9875 assert(global_scope == NULL);
9876 global_scope = &unit->scope;
9878 assert(scope == NULL);
9879 set_scope(&unit->scope);
9881 initialize_builtin_types();
9884 translation_unit_t *finish_parsing(void)
9886 assert(scope == &unit->scope);
9888 last_declaration = NULL;
9890 assert(global_scope == &unit->scope);
9891 check_unused_globals();
9892 global_scope = NULL;
9894 DEL_ARR_F(environment_stack);
9895 DEL_ARR_F(label_stack);
9896 DEL_ARR_F(local_label_stack);
9898 translation_unit_t *result = unit;
9905 lookahead_bufpos = 0;
9906 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
9909 parse_translation_unit();
9913 * Initialize the parser.
9915 void init_parser(void)
9917 sym_anonymous = symbol_table_insert("<anonymous>");
9920 /* add predefined symbols for extended-decl-modifier */
9921 sym_align = symbol_table_insert("align");
9922 sym_allocate = symbol_table_insert("allocate");
9923 sym_dllimport = symbol_table_insert("dllimport");
9924 sym_dllexport = symbol_table_insert("dllexport");
9925 sym_naked = symbol_table_insert("naked");
9926 sym_noinline = symbol_table_insert("noinline");
9927 sym_noreturn = symbol_table_insert("noreturn");
9928 sym_nothrow = symbol_table_insert("nothrow");
9929 sym_novtable = symbol_table_insert("novtable");
9930 sym_property = symbol_table_insert("property");
9931 sym_get = symbol_table_insert("get");
9932 sym_put = symbol_table_insert("put");
9933 sym_selectany = symbol_table_insert("selectany");
9934 sym_thread = symbol_table_insert("thread");
9935 sym_uuid = symbol_table_insert("uuid");
9936 sym_deprecated = symbol_table_insert("deprecated");
9937 sym_restrict = symbol_table_insert("restrict");
9938 sym_noalias = symbol_table_insert("noalias");
9940 memset(token_anchor_set, 0, sizeof(token_anchor_set));
9942 init_expression_parsers();
9943 obstack_init(&temp_obst);
9945 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
9946 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
9950 * Terminate the parser.
9952 void exit_parser(void)
9954 obstack_free(&temp_obst, NULL);