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 //#define PRINT_TOKENS
43 #define MAX_LOOKAHEAD 2
46 declaration_t *old_declaration;
48 unsigned short namespc;
51 typedef struct gnu_attribute_t gnu_attribute_t;
52 struct gnu_attribute_t {
53 gnu_attribute_kind_t kind;
54 gnu_attribute_t *next;
63 typedef struct declaration_specifiers_t declaration_specifiers_t;
64 struct declaration_specifiers_t {
65 source_position_t source_position;
66 unsigned char declared_storage_class;
67 unsigned char alignment; /**< Alignment, 0 if not set. */
68 unsigned int is_inline : 1;
69 unsigned int deprecated : 1;
70 decl_modifiers_t decl_modifiers; /**< MS __declspec extended modifier mask */
71 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
72 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
73 symbol_t *get_property_sym; /**< the name of the get property if set. */
74 symbol_t *put_property_sym; /**< the name of the put property if set. */
79 * An environment for parsing initializers (and compound literals).
81 typedef struct parse_initializer_env_t {
82 type_t *type; /**< the type of the initializer. In case of an
83 array type with unspecified size this gets
84 adjusted to the actual size. */
85 declaration_t *declaration; /**< the declaration that is initialized if any */
86 bool must_be_constant;
87 } parse_initializer_env_t;
89 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
92 static token_t lookahead_buffer[MAX_LOOKAHEAD];
93 static int lookahead_bufpos;
94 static stack_entry_t *environment_stack = NULL;
95 static stack_entry_t *label_stack = NULL;
96 static scope_t *global_scope = NULL;
97 static scope_t *scope = NULL;
98 static declaration_t *last_declaration = NULL;
99 static declaration_t *current_function = NULL;
100 static switch_statement_t *current_switch = NULL;
101 static statement_t *current_loop = NULL;
102 static ms_try_statement_t *current_try = NULL;
103 static goto_statement_t *goto_first = NULL;
104 static goto_statement_t *goto_last = NULL;
105 static label_statement_t *label_first = NULL;
106 static label_statement_t *label_last = NULL;
107 static struct obstack temp_obst;
109 static source_position_t null_position = { NULL, 0 };
111 /* symbols for Microsoft extended-decl-modifier */
112 static const symbol_t *sym_align = NULL;
113 static const symbol_t *sym_allocate = NULL;
114 static const symbol_t *sym_dllimport = NULL;
115 static const symbol_t *sym_dllexport = NULL;
116 static const symbol_t *sym_naked = NULL;
117 static const symbol_t *sym_noinline = NULL;
118 static const symbol_t *sym_noreturn = NULL;
119 static const symbol_t *sym_nothrow = NULL;
120 static const symbol_t *sym_novtable = NULL;
121 static const symbol_t *sym_property = NULL;
122 static const symbol_t *sym_get = NULL;
123 static const symbol_t *sym_put = NULL;
124 static const symbol_t *sym_selectany = NULL;
125 static const symbol_t *sym_thread = NULL;
126 static const symbol_t *sym_uuid = NULL;
127 static const symbol_t *sym_deprecated = NULL;
128 static const symbol_t *sym_restrict = NULL;
129 static const symbol_t *sym_noalias = NULL;
131 /** The token anchor set */
132 static unsigned char token_anchor_set[T_LAST_TOKEN];
134 /** The current source position. */
135 #define HERE (&token.source_position)
137 static type_t *type_valist;
139 static statement_t *parse_compound_statement(bool inside_expression_statement);
140 static statement_t *parse_statement(void);
142 static expression_t *parse_sub_expression(unsigned precedence);
143 static expression_t *parse_expression(void);
144 static type_t *parse_typename(void);
146 static void parse_compound_type_entries(declaration_t *compound_declaration);
147 static declaration_t *parse_declarator(
148 const declaration_specifiers_t *specifiers, bool may_be_abstract);
149 static declaration_t *record_declaration(declaration_t *declaration);
151 static void semantic_comparison(binary_expression_t *expression);
153 #define STORAGE_CLASSES \
160 #define TYPE_QUALIFIERS \
167 #ifdef PROVIDE_COMPLEX
168 #define COMPLEX_SPECIFIERS \
170 #define IMAGINARY_SPECIFIERS \
173 #define COMPLEX_SPECIFIERS
174 #define IMAGINARY_SPECIFIERS
177 #define TYPE_SPECIFIERS \
192 case T___builtin_va_list: \
197 #define DECLARATION_START \
202 #define TYPENAME_START \
207 * Allocate an AST node with given size and
208 * initialize all fields with zero.
210 static void *allocate_ast_zero(size_t size)
212 void *res = allocate_ast(size);
213 memset(res, 0, size);
217 static declaration_t *allocate_declaration_zero(void)
219 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
220 declaration->type = type_error_type;
221 declaration->alignment = 0;
226 * Returns the size of a statement node.
228 * @param kind the statement kind
230 static size_t get_statement_struct_size(statement_kind_t kind)
232 static const size_t sizes[] = {
233 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
234 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
235 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
236 [STATEMENT_RETURN] = sizeof(return_statement_t),
237 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
238 [STATEMENT_IF] = sizeof(if_statement_t),
239 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
240 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
241 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
242 [STATEMENT_BREAK] = sizeof(statement_base_t),
243 [STATEMENT_GOTO] = sizeof(goto_statement_t),
244 [STATEMENT_LABEL] = sizeof(label_statement_t),
245 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
246 [STATEMENT_WHILE] = sizeof(while_statement_t),
247 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
248 [STATEMENT_FOR] = sizeof(for_statement_t),
249 [STATEMENT_ASM] = sizeof(asm_statement_t),
250 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
251 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
253 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
254 assert(sizes[kind] != 0);
259 * Returns the size of an expression node.
261 * @param kind the expression kind
263 static size_t get_expression_struct_size(expression_kind_t kind)
265 static const size_t sizes[] = {
266 [EXPR_INVALID] = sizeof(expression_base_t),
267 [EXPR_REFERENCE] = sizeof(reference_expression_t),
268 [EXPR_CONST] = sizeof(const_expression_t),
269 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
270 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
271 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
272 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
273 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
274 [EXPR_CALL] = sizeof(call_expression_t),
275 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
276 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
277 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
278 [EXPR_SELECT] = sizeof(select_expression_t),
279 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
280 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
281 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
282 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
283 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
284 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
285 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
286 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
287 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
288 [EXPR_VA_START] = sizeof(va_start_expression_t),
289 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
290 [EXPR_STATEMENT] = sizeof(statement_expression_t),
292 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
293 return sizes[EXPR_UNARY_FIRST];
295 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
296 return sizes[EXPR_BINARY_FIRST];
298 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
299 assert(sizes[kind] != 0);
304 * Allocate a statement node of given kind and initialize all
307 static statement_t *allocate_statement_zero(statement_kind_t kind)
309 size_t size = get_statement_struct_size(kind);
310 statement_t *res = allocate_ast_zero(size);
312 res->base.kind = kind;
317 * Allocate an expression node of given kind and initialize all
320 static expression_t *allocate_expression_zero(expression_kind_t kind)
322 size_t size = get_expression_struct_size(kind);
323 expression_t *res = allocate_ast_zero(size);
325 res->base.kind = kind;
326 res->base.type = type_error_type;
331 * Creates a new invalid expression.
333 static expression_t *create_invalid_expression(void)
335 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
336 expression->base.source_position = token.source_position;
341 * Creates a new invalid statement.
343 static statement_t *create_invalid_statement(void)
345 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
346 statement->base.source_position = token.source_position;
351 * Allocate a new empty statement.
353 static statement_t *create_empty_statement(void)
355 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
356 statement->base.source_position = token.source_position;
361 * Returns the size of a type node.
363 * @param kind the type kind
365 static size_t get_type_struct_size(type_kind_t kind)
367 static const size_t sizes[] = {
368 [TYPE_ATOMIC] = sizeof(atomic_type_t),
369 [TYPE_COMPLEX] = sizeof(complex_type_t),
370 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
371 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
372 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
373 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
374 [TYPE_ENUM] = sizeof(enum_type_t),
375 [TYPE_FUNCTION] = sizeof(function_type_t),
376 [TYPE_POINTER] = sizeof(pointer_type_t),
377 [TYPE_ARRAY] = sizeof(array_type_t),
378 [TYPE_BUILTIN] = sizeof(builtin_type_t),
379 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
380 [TYPE_TYPEOF] = sizeof(typeof_type_t),
382 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
383 assert(kind <= TYPE_TYPEOF);
384 assert(sizes[kind] != 0);
389 * Allocate a type node of given kind and initialize all
392 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
394 size_t size = get_type_struct_size(kind);
395 type_t *res = obstack_alloc(type_obst, size);
396 memset(res, 0, size);
398 res->base.kind = kind;
399 res->base.source_position = *source_position;
404 * Returns the size of an initializer node.
406 * @param kind the initializer kind
408 static size_t get_initializer_size(initializer_kind_t kind)
410 static const size_t sizes[] = {
411 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
412 [INITIALIZER_STRING] = sizeof(initializer_string_t),
413 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
414 [INITIALIZER_LIST] = sizeof(initializer_list_t),
415 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
417 assert(kind < sizeof(sizes) / sizeof(*sizes));
418 assert(sizes[kind] != 0);
423 * Allocate an initializer node of given kind and initialize all
426 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
428 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
435 * Free a type from the type obstack.
437 static void free_type(void *type)
439 obstack_free(type_obst, type);
443 * Returns the index of the top element of the environment stack.
445 static size_t environment_top(void)
447 return ARR_LEN(environment_stack);
451 * Returns the index of the top element of the label stack.
453 static size_t label_top(void)
455 return ARR_LEN(label_stack);
459 * Return the next token.
461 static inline void next_token(void)
463 token = lookahead_buffer[lookahead_bufpos];
464 lookahead_buffer[lookahead_bufpos] = lexer_token;
467 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
470 print_token(stderr, &token);
471 fprintf(stderr, "\n");
476 * Return the next token with a given lookahead.
478 static inline const token_t *look_ahead(int num)
480 assert(num > 0 && num <= MAX_LOOKAHEAD);
481 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
482 return &lookahead_buffer[pos];
486 * Adds a token to the token anchor set (a multi-set).
488 static void add_anchor_token(int token_type) {
489 assert(0 <= token_type && token_type < T_LAST_TOKEN);
490 ++token_anchor_set[token_type];
493 static int save_and_reset_anchor_state(int token_type) {
494 assert(0 <= token_type && token_type < T_LAST_TOKEN);
495 int count = token_anchor_set[token_type];
496 token_anchor_set[token_type] = 0;
500 static void restore_anchor_state(int token_type, int count) {
501 assert(0 <= token_type && token_type < T_LAST_TOKEN);
502 token_anchor_set[token_type] = count;
506 * Remove a token from the token anchor set (a multi-set).
508 static void rem_anchor_token(int token_type) {
509 assert(0 <= token_type && token_type < T_LAST_TOKEN);
510 --token_anchor_set[token_type];
513 static bool at_anchor(void) {
516 return token_anchor_set[token.type];
520 * Eat tokens until a matching token is found.
522 static void eat_until_matching_token(int type) {
523 unsigned parenthesis_count = 0;
524 unsigned brace_count = 0;
525 unsigned bracket_count = 0;
526 int end_token = type;
535 while(token.type != end_token ||
536 (parenthesis_count > 0 || brace_count > 0 || bracket_count > 0)) {
540 case '(': ++parenthesis_count; break;
541 case '{': ++brace_count; break;
542 case '[': ++bracket_count; break;
544 if(parenthesis_count > 0)
552 if(bracket_count > 0)
563 * Eat input tokens until an anchor is found.
565 static void eat_until_anchor(void) {
566 if(token.type == T_EOF)
568 while(token_anchor_set[token.type] == 0) {
569 if(token.type == '(' || token.type == '{' || token.type == '[')
570 eat_until_matching_token(token.type);
571 if(token.type == T_EOF)
577 static void eat_block(void) {
578 eat_until_matching_token('{');
579 if(token.type == '}')
584 * eat all token until a ';' is reached or a stop token is found.
586 static void eat_statement(void) {
587 eat_until_matching_token(';');
588 if(token.type == ';')
592 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
595 * Report a parse error because an expected token was not found.
598 #if defined __GNUC__ && __GNUC__ >= 4
599 __attribute__((sentinel))
601 void parse_error_expected(const char *message, ...)
603 if(message != NULL) {
604 errorf(HERE, "%s", message);
607 va_start(ap, message);
608 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
613 * Report a type error.
615 static void type_error(const char *msg, const source_position_t *source_position,
618 errorf(source_position, "%s, but found type '%T'", msg, type);
622 * Report an incompatible type.
624 static void type_error_incompatible(const char *msg,
625 const source_position_t *source_position, type_t *type1, type_t *type2)
627 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
632 * Expect the the current token is the expected token.
633 * If not, generate an error, eat the current statement,
634 * and goto the end_error label.
636 #define expect(expected) \
638 if(UNLIKELY(token.type != (expected))) { \
639 parse_error_expected(NULL, (expected), NULL); \
640 add_anchor_token(expected); \
641 eat_until_anchor(); \
642 if (token.type == expected) \
644 rem_anchor_token(expected); \
650 static void set_scope(scope_t *new_scope)
653 scope->last_declaration = last_declaration;
657 last_declaration = new_scope->last_declaration;
661 * Search a symbol in a given namespace and returns its declaration or
662 * NULL if this symbol was not found.
664 static declaration_t *get_declaration(const symbol_t *const symbol,
665 const namespace_t namespc)
667 declaration_t *declaration = symbol->declaration;
668 for( ; declaration != NULL; declaration = declaration->symbol_next) {
669 if(declaration->namespc == namespc)
677 * pushs an environment_entry on the environment stack and links the
678 * corresponding symbol to the new entry
680 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
682 symbol_t *symbol = declaration->symbol;
683 namespace_t namespc = (namespace_t) declaration->namespc;
685 /* replace/add declaration into declaration list of the symbol */
686 declaration_t *iter = symbol->declaration;
688 symbol->declaration = declaration;
690 declaration_t *iter_last = NULL;
691 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
692 /* replace an entry? */
693 if(iter->namespc == namespc) {
694 if(iter_last == NULL) {
695 symbol->declaration = declaration;
697 iter_last->symbol_next = declaration;
699 declaration->symbol_next = iter->symbol_next;
704 assert(iter_last->symbol_next == NULL);
705 iter_last->symbol_next = declaration;
709 /* remember old declaration */
711 entry.symbol = symbol;
712 entry.old_declaration = iter;
713 entry.namespc = (unsigned short) namespc;
714 ARR_APP1(stack_entry_t, *stack_ptr, entry);
717 static void environment_push(declaration_t *declaration)
719 assert(declaration->source_position.input_name != NULL);
720 assert(declaration->parent_scope != NULL);
721 stack_push(&environment_stack, declaration);
724 static void label_push(declaration_t *declaration)
726 declaration->parent_scope = ¤t_function->scope;
727 stack_push(&label_stack, declaration);
731 * pops symbols from the environment stack until @p new_top is the top element
733 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
735 stack_entry_t *stack = *stack_ptr;
736 size_t top = ARR_LEN(stack);
739 assert(new_top <= top);
743 for(i = top; i > new_top; --i) {
744 stack_entry_t *entry = &stack[i - 1];
746 declaration_t *old_declaration = entry->old_declaration;
747 symbol_t *symbol = entry->symbol;
748 namespace_t namespc = (namespace_t)entry->namespc;
750 /* replace/remove declaration */
751 declaration_t *declaration = symbol->declaration;
752 assert(declaration != NULL);
753 if(declaration->namespc == namespc) {
754 if(old_declaration == NULL) {
755 symbol->declaration = declaration->symbol_next;
757 symbol->declaration = old_declaration;
760 declaration_t *iter_last = declaration;
761 declaration_t *iter = declaration->symbol_next;
762 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
763 /* replace an entry? */
764 if(iter->namespc == namespc) {
765 assert(iter_last != NULL);
766 iter_last->symbol_next = old_declaration;
767 if(old_declaration != NULL) {
768 old_declaration->symbol_next = iter->symbol_next;
773 assert(iter != NULL);
777 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
780 static void environment_pop_to(size_t new_top)
782 stack_pop_to(&environment_stack, new_top);
785 static void label_pop_to(size_t new_top)
787 stack_pop_to(&label_stack, new_top);
791 static int get_rank(const type_t *type)
793 assert(!is_typeref(type));
794 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
795 * and esp. footnote 108). However we can't fold constants (yet), so we
796 * can't decide whether unsigned int is possible, while int always works.
797 * (unsigned int would be preferable when possible... for stuff like
798 * struct { enum { ... } bla : 4; } ) */
799 if(type->kind == TYPE_ENUM)
800 return ATOMIC_TYPE_INT;
802 assert(type->kind == TYPE_ATOMIC);
803 return type->atomic.akind;
806 static type_t *promote_integer(type_t *type)
808 if(type->kind == TYPE_BITFIELD)
809 type = type->bitfield.base_type;
811 if(get_rank(type) < ATOMIC_TYPE_INT)
818 * Create a cast expression.
820 * @param expression the expression to cast
821 * @param dest_type the destination type
823 static expression_t *create_cast_expression(expression_t *expression,
826 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
828 cast->unary.value = expression;
829 cast->base.type = dest_type;
835 * Check if a given expression represents the 0 pointer constant.
837 static bool is_null_pointer_constant(const expression_t *expression)
839 /* skip void* cast */
840 if(expression->kind == EXPR_UNARY_CAST
841 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
842 expression = expression->unary.value;
845 /* TODO: not correct yet, should be any constant integer expression
846 * which evaluates to 0 */
847 if (expression->kind != EXPR_CONST)
850 type_t *const type = skip_typeref(expression->base.type);
851 if (!is_type_integer(type))
854 return expression->conste.v.int_value == 0;
858 * Create an implicit cast expression.
860 * @param expression the expression to cast
861 * @param dest_type the destination type
863 static expression_t *create_implicit_cast(expression_t *expression,
866 type_t *const source_type = expression->base.type;
868 if (source_type == dest_type)
871 return create_cast_expression(expression, dest_type);
874 /** Implements the rules from § 6.5.16.1 */
875 static type_t *semantic_assign(type_t *orig_type_left,
876 const expression_t *const right,
878 const source_position_t *source_position)
880 type_t *const orig_type_right = right->base.type;
881 type_t *const type_left = skip_typeref(orig_type_left);
882 type_t *const type_right = skip_typeref(orig_type_right);
884 if(is_type_pointer(type_left)) {
885 if(is_null_pointer_constant(right)) {
886 return orig_type_left;
887 } else if(is_type_pointer(type_right)) {
888 type_t *points_to_left
889 = skip_typeref(type_left->pointer.points_to);
890 type_t *points_to_right
891 = skip_typeref(type_right->pointer.points_to);
893 /* the left type has all qualifiers from the right type */
894 unsigned missing_qualifiers
895 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
896 if(missing_qualifiers != 0) {
897 errorf(source_position,
898 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
899 return orig_type_left;
902 points_to_left = get_unqualified_type(points_to_left);
903 points_to_right = get_unqualified_type(points_to_right);
905 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
906 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
907 return orig_type_left;
910 if (!types_compatible(points_to_left, points_to_right)) {
911 warningf(source_position,
912 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
913 orig_type_left, context, right, orig_type_right);
916 return orig_type_left;
917 } else if(is_type_integer(type_right)) {
918 warningf(source_position,
919 "%s makes pointer '%T' from integer '%T' without a cast",
920 context, orig_type_left, orig_type_right);
921 return orig_type_left;
923 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
924 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
925 && is_type_pointer(type_right))) {
926 return orig_type_left;
927 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
928 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
929 type_t *const unqual_type_left = get_unqualified_type(type_left);
930 type_t *const unqual_type_right = get_unqualified_type(type_right);
931 if (types_compatible(unqual_type_left, unqual_type_right)) {
932 return orig_type_left;
934 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
935 warningf(source_position,
936 "%s makes integer '%T' from pointer '%T' without a cast",
937 context, orig_type_left, orig_type_right);
938 return orig_type_left;
941 if (!is_type_valid(type_left))
944 if (!is_type_valid(type_right))
945 return orig_type_right;
950 static expression_t *parse_constant_expression(void)
952 /* start parsing at precedence 7 (conditional expression) */
953 expression_t *result = parse_sub_expression(7);
955 if(!is_constant_expression(result)) {
956 errorf(&result->base.source_position,
957 "expression '%E' is not constant\n", result);
963 static expression_t *parse_assignment_expression(void)
965 /* start parsing at precedence 2 (assignment expression) */
966 return parse_sub_expression(2);
969 static type_t *make_global_typedef(const char *name, type_t *type)
971 symbol_t *const symbol = symbol_table_insert(name);
973 declaration_t *const declaration = allocate_declaration_zero();
974 declaration->namespc = NAMESPACE_NORMAL;
975 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
976 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
977 declaration->type = type;
978 declaration->symbol = symbol;
979 declaration->source_position = builtin_source_position;
981 record_declaration(declaration);
983 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
984 typedef_type->typedeft.declaration = declaration;
989 static string_t parse_string_literals(void)
991 assert(token.type == T_STRING_LITERAL);
992 string_t result = token.v.string;
996 while (token.type == T_STRING_LITERAL) {
997 result = concat_strings(&result, &token.v.string);
1004 static const char *gnu_attribute_names[GNU_AK_LAST] = {
1005 [GNU_AK_CONST] = "const",
1006 [GNU_AK_VOLATILE] = "volatile",
1007 [GNU_AK_CDECL] = "cdecl",
1008 [GNU_AK_STDCALL] = "stdcall",
1009 [GNU_AK_FASTCALL] = "fastcall",
1010 [GNU_AK_DEPRECATED] = "deprecated",
1011 [GNU_AK_NOINLINE] = "noinline",
1012 [GNU_AK_NORETURN] = "noreturn",
1013 [GNU_AK_NAKED] = "naked",
1014 [GNU_AK_PURE] = "pure",
1015 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1016 [GNU_AK_MALLOC] = "malloc",
1017 [GNU_AK_WEAK] = "weak",
1018 [GNU_AK_CONSTRUCTOR] = "constructor",
1019 [GNU_AK_DESTRUCTOR] = "destructor",
1020 [GNU_AK_NOTHROW] = "nothrow",
1021 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1022 [GNU_AK_COMMON] = "coommon",
1023 [GNU_AK_NOCOMMON] = "nocommon",
1024 [GNU_AK_PACKED] = "packed",
1025 [GNU_AK_SHARED] = "shared",
1026 [GNU_AK_NOTSHARED] = "notshared",
1027 [GNU_AK_USED] = "used",
1028 [GNU_AK_UNUSED] = "unused",
1029 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1030 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1031 [GNU_AK_LONGCALL] = "longcall",
1032 [GNU_AK_SHORTCALL] = "shortcall",
1033 [GNU_AK_LONG_CALL] = "long_call",
1034 [GNU_AK_SHORT_CALL] = "short_call",
1035 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1036 [GNU_AK_INTERRUPT] = "interrupt",
1037 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1038 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1039 [GNU_AK_NESTING] = "nesting",
1040 [GNU_AK_NEAR] = "near",
1041 [GNU_AK_FAR] = "far",
1042 [GNU_AK_SIGNAL] = "signal",
1043 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1044 [GNU_AK_TINY_DATA] = "tiny_data",
1045 [GNU_AK_SAVEALL] = "saveall",
1046 [GNU_AK_FLATTEN] = "flatten",
1047 [GNU_AK_SSEREGPARM] = "sseregparm",
1048 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1049 [GNU_AK_RETURN_TWICE] = "return_twice",
1050 [GNU_AK_MAY_ALIAS] = "may_alias",
1051 [GNU_AK_MS_STRUCT] = "ms_struct",
1052 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1053 [GNU_AK_DLLIMPORT] = "dllimport",
1054 [GNU_AK_DLLEXPORT] = "dllexport",
1055 [GNU_AK_ALIGNED] = "aligned",
1056 [GNU_AK_ALIAS] = "alias",
1057 [GNU_AK_SECTION] = "section",
1058 [GNU_AK_FORMAT] = "format",
1059 [GNU_AK_FORMAT_ARG] = "format_arg",
1060 [GNU_AK_WEAKREF] = "weakref",
1061 [GNU_AK_NONNULL] = "nonnull",
1062 [GNU_AK_TLS_MODEL] = "tls_model",
1063 [GNU_AK_VISIBILITY] = "visibility",
1064 [GNU_AK_REGPARM] = "regparm",
1065 [GNU_AK_MODE] = "mode",
1066 [GNU_AK_MODEL] = "model",
1067 [GNU_AK_TRAP_EXIT] = "trap_exit",
1068 [GNU_AK_SP_SWITCH] = "sp_switch",
1069 [GNU_AK_SENTINEL] = "sentinel"
1073 * compare two string, ignoring double underscores on the second.
1075 static int strcmp_underscore(const char *s1, const char *s2) {
1076 if(s2[0] == '_' && s2[1] == '_') {
1078 size_t l1 = strlen(s1);
1079 if(l1 + 2 != strlen(s2)) {
1083 return strncmp(s1, s2, l1);
1085 return strcmp(s1, s2);
1089 * Allocate a new gnu temporal attribute.
1091 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind) {
1092 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1093 attribute->kind = kind;
1094 attribute->next = NULL;
1095 attribute->invalid = false;
1096 attribute->have_arguments = false;
1102 * parse one constant expression argument.
1104 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute) {
1105 expression_t *expression;
1106 add_anchor_token(')');
1107 expression = parse_constant_expression();
1108 rem_anchor_token(')');
1113 attribute->invalid = true;
1117 * parse a list of constant expressions arguments.
1119 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute) {
1120 expression_t *expression;
1121 add_anchor_token(')');
1122 add_anchor_token(',');
1124 expression = parse_constant_expression();
1125 if(token.type != ',')
1129 rem_anchor_token(',');
1130 rem_anchor_token(')');
1135 attribute->invalid = true;
1139 * parse one string literal argument.
1141 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1144 add_anchor_token('(');
1145 if(token.type != T_STRING_LITERAL) {
1146 parse_error_expected("while parsing attribute directive",
1147 T_STRING_LITERAL, NULL);
1150 *string = parse_string_literals();
1151 rem_anchor_token('(');
1155 attribute->invalid = true;
1159 * parse one tls model.
1161 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute) {
1162 static const char *tls_models[] = {
1168 string_t string = { NULL, 0 };
1169 parse_gnu_attribute_string_arg(attribute, &string);
1170 if(string.begin != NULL) {
1171 for(size_t i = 0; i < 4; ++i) {
1172 if(strcmp(tls_models[i], string.begin) == 0) {
1173 attribute->u.value = i;
1178 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1179 attribute->invalid = true;
1183 * parse one tls model.
1185 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute) {
1186 static const char *visibilities[] = {
1192 string_t string = { NULL, 0 };
1193 parse_gnu_attribute_string_arg(attribute, &string);
1194 if(string.begin != NULL) {
1195 for(size_t i = 0; i < 4; ++i) {
1196 if(strcmp(visibilities[i], string.begin) == 0) {
1197 attribute->u.value = i;
1202 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1203 attribute->invalid = true;
1207 * parse one (code) model.
1209 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute) {
1210 static const char *visibilities[] = {
1215 string_t string = { NULL, 0 };
1216 parse_gnu_attribute_string_arg(attribute, &string);
1217 if(string.begin != NULL) {
1218 for(int i = 0; i < 3; ++i) {
1219 if(strcmp(visibilities[i], string.begin) == 0) {
1220 attribute->u.value = i;
1225 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1226 attribute->invalid = true;
1229 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1231 /* TODO: find out what is allowed here... */
1233 /* at least: byte, word, pointer, list of machine modes
1234 * __XXX___ is interpreted as XXX */
1235 add_anchor_token(')');
1236 expect(T_IDENTIFIER);
1237 rem_anchor_token(')');
1241 attribute->invalid = true;
1245 * parse one interrupt argument.
1247 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute) {
1248 static const char *interrupts[] = {
1255 string_t string = { NULL, 0 };
1256 parse_gnu_attribute_string_arg(attribute, &string);
1257 if(string.begin != NULL) {
1258 for(size_t i = 0; i < 5; ++i) {
1259 if(strcmp(interrupts[i], string.begin) == 0) {
1260 attribute->u.value = i;
1265 errorf(HERE, "'%s' is an interrupt", string.begin);
1266 attribute->invalid = true;
1270 * parse ( identifier, const expression, const expression )
1272 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute) {
1273 static const char *format_names[] = {
1281 if(token.type != T_IDENTIFIER) {
1282 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1285 const char *name = token.v.symbol->string;
1286 for(i = 0; i < 4; ++i) {
1287 if(strcmp_underscore(format_names[i], name) == 0)
1291 if(warning.attribute)
1292 warningf(HERE, "'%s' is an unrecognized format function type", name);
1297 add_anchor_token(')');
1298 add_anchor_token(',');
1299 parse_constant_expression();
1300 rem_anchor_token(',');
1301 rem_anchor_token('(');
1304 add_anchor_token(')');
1305 parse_constant_expression();
1306 rem_anchor_token('(');
1310 attribute->u.value = true;
1314 * Parse one GNU attribute.
1316 * Note that attribute names can be specified WITH or WITHOUT
1317 * double underscores, ie const or __const__.
1319 * The following attributes are parsed without arguments
1344 * no_instrument_function
1345 * warn_unused_result
1362 * externally_visible
1370 * The following attributes are parsed with arguments
1371 * aligned( const expression )
1372 * alias( string literal )
1373 * section( string literal )
1374 * format( identifier, const expression, const expression )
1375 * format_arg( const expression )
1376 * tls_model( string literal )
1377 * visibility( string literal )
1378 * regparm( const expression )
1379 * model( string leteral )
1380 * trap_exit( const expression )
1381 * sp_switch( string literal )
1383 * The following attributes might have arguments
1384 * weak_ref( string literal )
1385 * non_null( const expression // ',' )
1386 * interrupt( string literal )
1387 * sentinel( constant expression )
1389 static void parse_gnu_attribute(gnu_attribute_t **attributes)
1391 gnu_attribute_t *head = *attributes;
1392 gnu_attribute_t *last = *attributes;
1393 gnu_attribute_t *attribute;
1395 eat(T___attribute__);
1399 if(token.type != ')') {
1400 /* find the end of the list */
1402 while(last->next != NULL)
1406 /* non-empty attribute list */
1409 if(token.type == T_const) {
1411 } else if(token.type == T_volatile) {
1413 } else if(token.type == T_cdecl) {
1414 /* __attribute__((cdecl)), WITH ms mode */
1416 } else if(token.type != T_IDENTIFIER) {
1417 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1420 const symbol_t *sym = token.v.symbol;
1425 for(i = 0; i < GNU_AK_LAST; ++i) {
1426 if(strcmp_underscore(gnu_attribute_names[i], name) == 0)
1429 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1432 if(kind == GNU_AK_LAST) {
1433 if(warning.attribute)
1434 warningf(HERE, "'%s' attribute directive ignored", name);
1436 /* skip possible arguments */
1437 if(token.type == '(') {
1438 eat_until_matching_token(')');
1441 /* check for arguments */
1442 attribute = allocate_gnu_attribute(kind);
1443 if(token.type == '(') {
1445 if(token.type == ')') {
1446 /* empty args are allowed */
1449 attribute->have_arguments = true;
1454 case GNU_AK_VOLATILE:
1456 case GNU_AK_STDCALL:
1457 case GNU_AK_FASTCALL:
1458 case GNU_AK_DEPRECATED:
1459 case GNU_AK_NOINLINE:
1460 case GNU_AK_NORETURN:
1463 case GNU_AK_ALWAYS_INLINE:
1466 case GNU_AK_CONSTRUCTOR:
1467 case GNU_AK_DESTRUCTOR:
1468 case GNU_AK_NOTHROW:
1469 case GNU_AK_TRANSPARENT_UNION:
1471 case GNU_AK_NOCOMMON:
1474 case GNU_AK_NOTSHARED:
1477 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1478 case GNU_AK_WARN_UNUSED_RESULT:
1479 case GNU_AK_LONGCALL:
1480 case GNU_AK_SHORTCALL:
1481 case GNU_AK_LONG_CALL:
1482 case GNU_AK_SHORT_CALL:
1483 case GNU_AK_FUNCTION_VECTOR:
1484 case GNU_AK_INTERRUPT_HANDLER:
1485 case GNU_AK_NMI_HANDLER:
1486 case GNU_AK_NESTING:
1490 case GNU_AK_EIGTHBIT_DATA:
1491 case GNU_AK_TINY_DATA:
1492 case GNU_AK_SAVEALL:
1493 case GNU_AK_FLATTEN:
1494 case GNU_AK_SSEREGPARM:
1495 case GNU_AK_EXTERNALLY_VISIBLE:
1496 case GNU_AK_RETURN_TWICE:
1497 case GNU_AK_MAY_ALIAS:
1498 case GNU_AK_MS_STRUCT:
1499 case GNU_AK_GCC_STRUCT:
1500 case GNU_AK_DLLIMPORT:
1501 case GNU_AK_DLLEXPORT:
1502 if(attribute->have_arguments) {
1503 /* should have no arguments */
1504 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1505 eat_until_matching_token('(');
1506 /* we have already consumed '(', so we stop before ')', eat it */
1508 attribute->invalid = true;
1512 case GNU_AK_ALIGNED:
1513 case GNU_AK_FORMAT_ARG:
1514 case GNU_AK_REGPARM:
1515 case GNU_AK_TRAP_EXIT:
1516 if(!attribute->have_arguments) {
1517 /* should have arguments */
1518 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1519 attribute->invalid = true;
1521 parse_gnu_attribute_const_arg(attribute);
1524 case GNU_AK_SECTION:
1525 case GNU_AK_SP_SWITCH:
1526 if(!attribute->have_arguments) {
1527 /* should have arguments */
1528 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1529 attribute->invalid = true;
1531 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1534 if(!attribute->have_arguments) {
1535 /* should have arguments */
1536 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1537 attribute->invalid = true;
1539 parse_gnu_attribute_format_args(attribute);
1541 case GNU_AK_WEAKREF:
1542 /* may have one string argument */
1543 if(attribute->have_arguments)
1544 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1546 case GNU_AK_NONNULL:
1547 if(attribute->have_arguments)
1548 parse_gnu_attribute_const_arg_list(attribute);
1550 case GNU_AK_TLS_MODEL:
1551 if(!attribute->have_arguments) {
1552 /* should have arguments */
1553 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1555 parse_gnu_attribute_tls_model_arg(attribute);
1557 case GNU_AK_VISIBILITY:
1558 if(!attribute->have_arguments) {
1559 /* should have arguments */
1560 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1562 parse_gnu_attribute_visibility_arg(attribute);
1565 if(!attribute->have_arguments) {
1566 /* should have arguments */
1567 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1569 parse_gnu_attribute_model_arg(attribute);
1573 if(!attribute->have_arguments) {
1574 /* should have arguments */
1575 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1577 parse_gnu_attribute_mode_arg(attribute);
1580 case GNU_AK_INTERRUPT:
1581 /* may have one string argument */
1582 if(attribute->have_arguments)
1583 parse_gnu_attribute_interrupt_arg(attribute);
1585 case GNU_AK_SENTINEL:
1586 /* may have one string argument */
1587 if(attribute->have_arguments)
1588 parse_gnu_attribute_const_arg(attribute);
1591 /* already handled */
1595 if(attribute != NULL) {
1597 last->next = attribute;
1600 head = last = attribute;
1604 if(token.type != ',')
1616 * Parse GNU attributes.
1618 static void parse_attributes(gnu_attribute_t **attributes)
1621 switch(token.type) {
1622 case T___attribute__: {
1623 parse_gnu_attribute(attributes);
1629 if(token.type != T_STRING_LITERAL) {
1630 parse_error_expected("while parsing assembler attribute",
1631 T_STRING_LITERAL, NULL);
1632 eat_until_matching_token('(');
1635 parse_string_literals();
1640 goto attributes_finished;
1644 attributes_finished:
1649 static designator_t *parse_designation(void)
1651 designator_t *result = NULL;
1652 designator_t *last = NULL;
1655 designator_t *designator;
1656 switch(token.type) {
1658 designator = allocate_ast_zero(sizeof(designator[0]));
1659 designator->source_position = token.source_position;
1661 add_anchor_token(']');
1662 designator->array_index = parse_constant_expression();
1663 rem_anchor_token(']');
1667 designator = allocate_ast_zero(sizeof(designator[0]));
1668 designator->source_position = token.source_position;
1670 if(token.type != T_IDENTIFIER) {
1671 parse_error_expected("while parsing designator",
1672 T_IDENTIFIER, NULL);
1675 designator->symbol = token.v.symbol;
1683 assert(designator != NULL);
1685 last->next = designator;
1687 result = designator;
1695 static initializer_t *initializer_from_string(array_type_t *type,
1696 const string_t *const string)
1698 /* TODO: check len vs. size of array type */
1701 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1702 initializer->string.string = *string;
1707 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1708 wide_string_t *const string)
1710 /* TODO: check len vs. size of array type */
1713 initializer_t *const initializer =
1714 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1715 initializer->wide_string.string = *string;
1721 * Build an initializer from a given expression.
1723 static initializer_t *initializer_from_expression(type_t *orig_type,
1724 expression_t *expression)
1726 /* TODO check that expression is a constant expression */
1728 /* § 6.7.8.14/15 char array may be initialized by string literals */
1729 type_t *type = skip_typeref(orig_type);
1730 type_t *expr_type_orig = expression->base.type;
1731 type_t *expr_type = skip_typeref(expr_type_orig);
1732 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1733 array_type_t *const array_type = &type->array;
1734 type_t *const element_type = skip_typeref(array_type->element_type);
1736 if (element_type->kind == TYPE_ATOMIC) {
1737 atomic_type_kind_t akind = element_type->atomic.akind;
1738 switch (expression->kind) {
1739 case EXPR_STRING_LITERAL:
1740 if (akind == ATOMIC_TYPE_CHAR
1741 || akind == ATOMIC_TYPE_SCHAR
1742 || akind == ATOMIC_TYPE_UCHAR) {
1743 return initializer_from_string(array_type,
1744 &expression->string.value);
1747 case EXPR_WIDE_STRING_LITERAL: {
1748 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1749 if (get_unqualified_type(element_type) == bare_wchar_type) {
1750 return initializer_from_wide_string(array_type,
1751 &expression->wide_string.value);
1761 type_t *const res_type = semantic_assign(type, expression, "initializer",
1762 &expression->base.source_position);
1763 if (res_type == NULL)
1766 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1767 result->value.value = create_implicit_cast(expression, res_type);
1773 * Checks if a given expression can be used as an constant initializer.
1775 static bool is_initializer_constant(const expression_t *expression)
1777 return is_constant_expression(expression)
1778 || is_address_constant(expression);
1782 * Parses an scalar initializer.
1784 * § 6.7.8.11; eat {} without warning
1786 static initializer_t *parse_scalar_initializer(type_t *type,
1787 bool must_be_constant)
1789 /* there might be extra {} hierarchies */
1791 while(token.type == '{') {
1794 warningf(HERE, "extra curly braces around scalar initializer");
1799 expression_t *expression = parse_assignment_expression();
1800 if(must_be_constant && !is_initializer_constant(expression)) {
1801 errorf(&expression->base.source_position,
1802 "Initialisation expression '%E' is not constant\n",
1806 initializer_t *initializer = initializer_from_expression(type, expression);
1808 if(initializer == NULL) {
1809 errorf(&expression->base.source_position,
1810 "expression '%E' (type '%T') doesn't match expected type '%T'",
1811 expression, expression->base.type, type);
1816 bool additional_warning_displayed = false;
1818 if(token.type == ',') {
1821 if(token.type != '}') {
1822 if(!additional_warning_displayed) {
1823 warningf(HERE, "additional elements in scalar initializer");
1824 additional_warning_displayed = true;
1835 * An entry in the type path.
1837 typedef struct type_path_entry_t type_path_entry_t;
1838 struct type_path_entry_t {
1839 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
1841 size_t index; /**< For array types: the current index. */
1842 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1847 * A type path expression a position inside compound or array types.
1849 typedef struct type_path_t type_path_t;
1850 struct type_path_t {
1851 type_path_entry_t *path; /**< An flexible array containing the current path. */
1852 type_t *top_type; /**< type of the element the path points */
1853 size_t max_index; /**< largest index in outermost array */
1857 * Prints a type path for debugging.
1859 static __attribute__((unused)) void debug_print_type_path(
1860 const type_path_t *path)
1862 size_t len = ARR_LEN(path->path);
1864 for(size_t i = 0; i < len; ++i) {
1865 const type_path_entry_t *entry = & path->path[i];
1867 type_t *type = skip_typeref(entry->type);
1868 if(is_type_compound(type)) {
1869 /* in gcc mode structs can have no members */
1870 if(entry->v.compound_entry == NULL) {
1874 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
1875 } else if(is_type_array(type)) {
1876 fprintf(stderr, "[%zd]", entry->v.index);
1878 fprintf(stderr, "-INVALID-");
1881 if(path->top_type != NULL) {
1882 fprintf(stderr, " (");
1883 print_type(path->top_type);
1884 fprintf(stderr, ")");
1889 * Return the top type path entry, ie. in a path
1890 * (type).a.b returns the b.
1892 static type_path_entry_t *get_type_path_top(const type_path_t *path)
1894 size_t len = ARR_LEN(path->path);
1896 return &path->path[len-1];
1900 * Enlarge the type path by an (empty) element.
1902 static type_path_entry_t *append_to_type_path(type_path_t *path)
1904 size_t len = ARR_LEN(path->path);
1905 ARR_RESIZE(type_path_entry_t, path->path, len+1);
1907 type_path_entry_t *result = & path->path[len];
1908 memset(result, 0, sizeof(result[0]));
1913 * Descending into a sub-type. Enter the scope of the current
1916 static void descend_into_subtype(type_path_t *path)
1918 type_t *orig_top_type = path->top_type;
1919 type_t *top_type = skip_typeref(orig_top_type);
1921 assert(is_type_compound(top_type) || is_type_array(top_type));
1923 type_path_entry_t *top = append_to_type_path(path);
1924 top->type = top_type;
1926 if(is_type_compound(top_type)) {
1927 declaration_t *declaration = top_type->compound.declaration;
1928 declaration_t *entry = declaration->scope.declarations;
1929 top->v.compound_entry = entry;
1932 path->top_type = entry->type;
1934 path->top_type = NULL;
1937 assert(is_type_array(top_type));
1940 path->top_type = top_type->array.element_type;
1945 * Pop an entry from the given type path, ie. returning from
1946 * (type).a.b to (type).a
1948 static void ascend_from_subtype(type_path_t *path)
1950 type_path_entry_t *top = get_type_path_top(path);
1952 path->top_type = top->type;
1954 size_t len = ARR_LEN(path->path);
1955 ARR_RESIZE(type_path_entry_t, path->path, len-1);
1959 * Pop entries from the given type path until the given
1960 * path level is reached.
1962 static void ascend_to(type_path_t *path, size_t top_path_level)
1964 size_t len = ARR_LEN(path->path);
1966 while(len > top_path_level) {
1967 ascend_from_subtype(path);
1968 len = ARR_LEN(path->path);
1972 static bool walk_designator(type_path_t *path, const designator_t *designator,
1973 bool used_in_offsetof)
1975 for( ; designator != NULL; designator = designator->next) {
1976 type_path_entry_t *top = get_type_path_top(path);
1977 type_t *orig_type = top->type;
1979 type_t *type = skip_typeref(orig_type);
1981 if(designator->symbol != NULL) {
1982 symbol_t *symbol = designator->symbol;
1983 if(!is_type_compound(type)) {
1984 if(is_type_valid(type)) {
1985 errorf(&designator->source_position,
1986 "'.%Y' designator used for non-compound type '%T'",
1992 declaration_t *declaration = type->compound.declaration;
1993 declaration_t *iter = declaration->scope.declarations;
1994 for( ; iter != NULL; iter = iter->next) {
1995 if(iter->symbol == symbol) {
2000 errorf(&designator->source_position,
2001 "'%T' has no member named '%Y'", orig_type, symbol);
2004 if(used_in_offsetof) {
2005 type_t *real_type = skip_typeref(iter->type);
2006 if(real_type->kind == TYPE_BITFIELD) {
2007 errorf(&designator->source_position,
2008 "offsetof designator '%Y' may not specify bitfield",
2014 top->type = orig_type;
2015 top->v.compound_entry = iter;
2016 orig_type = iter->type;
2018 expression_t *array_index = designator->array_index;
2019 assert(designator->array_index != NULL);
2021 if(!is_type_array(type)) {
2022 if(is_type_valid(type)) {
2023 errorf(&designator->source_position,
2024 "[%E] designator used for non-array type '%T'",
2025 array_index, orig_type);
2029 if(!is_type_valid(array_index->base.type)) {
2033 long index = fold_constant(array_index);
2034 if(!used_in_offsetof) {
2036 errorf(&designator->source_position,
2037 "array index [%E] must be positive", array_index);
2040 if(type->array.size_constant == true) {
2041 long array_size = type->array.size;
2042 if(index >= array_size) {
2043 errorf(&designator->source_position,
2044 "designator [%E] (%d) exceeds array size %d",
2045 array_index, index, array_size);
2051 top->type = orig_type;
2052 top->v.index = (size_t) index;
2053 orig_type = type->array.element_type;
2055 path->top_type = orig_type;
2057 if(designator->next != NULL) {
2058 descend_into_subtype(path);
2067 static void advance_current_object(type_path_t *path, size_t top_path_level)
2069 type_path_entry_t *top = get_type_path_top(path);
2071 type_t *type = skip_typeref(top->type);
2072 if(is_type_union(type)) {
2073 /* in unions only the first element is initialized */
2074 top->v.compound_entry = NULL;
2075 } else if(is_type_struct(type)) {
2076 declaration_t *entry = top->v.compound_entry;
2078 entry = entry->next;
2079 top->v.compound_entry = entry;
2081 path->top_type = entry->type;
2085 assert(is_type_array(type));
2089 if(!type->array.size_constant || top->v.index < type->array.size) {
2094 /* we're past the last member of the current sub-aggregate, try if we
2095 * can ascend in the type hierarchy and continue with another subobject */
2096 size_t len = ARR_LEN(path->path);
2098 if(len > top_path_level) {
2099 ascend_from_subtype(path);
2100 advance_current_object(path, top_path_level);
2102 path->top_type = NULL;
2107 * skip until token is found.
2109 static void skip_until(int type) {
2110 while(token.type != type) {
2111 if(token.type == T_EOF)
2118 * skip any {...} blocks until a closing bracket is reached.
2120 static void skip_initializers(void)
2122 if(token.type == '{')
2125 while(token.type != '}') {
2126 if(token.type == T_EOF)
2128 if(token.type == '{') {
2136 static initializer_t *create_empty_initializer(void)
2138 static initializer_t empty_initializer
2139 = { .list = { { INITIALIZER_LIST }, 0 } };
2140 return &empty_initializer;
2144 * Parse a part of an initialiser for a struct or union,
2146 static initializer_t *parse_sub_initializer(type_path_t *path,
2147 type_t *outer_type, size_t top_path_level,
2148 parse_initializer_env_t *env)
2150 if(token.type == '}') {
2151 /* empty initializer */
2152 return create_empty_initializer();
2155 type_t *orig_type = path->top_type;
2156 type_t *type = NULL;
2158 if (orig_type == NULL) {
2159 /* We are initializing an empty compound. */
2161 type = skip_typeref(orig_type);
2163 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2164 * initializers in this case. */
2165 if(!is_type_valid(type)) {
2166 skip_initializers();
2167 return create_empty_initializer();
2171 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2174 designator_t *designator = NULL;
2175 if(token.type == '.' || token.type == '[') {
2176 designator = parse_designation();
2178 /* reset path to toplevel, evaluate designator from there */
2179 ascend_to(path, top_path_level);
2180 if(!walk_designator(path, designator, false)) {
2181 /* can't continue after designation error */
2185 initializer_t *designator_initializer
2186 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2187 designator_initializer->designator.designator = designator;
2188 ARR_APP1(initializer_t*, initializers, designator_initializer);
2190 orig_type = path->top_type;
2191 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2196 if(token.type == '{') {
2197 if(type != NULL && is_type_scalar(type)) {
2198 sub = parse_scalar_initializer(type, env->must_be_constant);
2202 if (env->declaration != NULL)
2203 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2204 env->declaration->symbol);
2206 errorf(HERE, "extra brace group at end of initializer");
2208 descend_into_subtype(path);
2210 add_anchor_token('}');
2211 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2213 rem_anchor_token('}');
2216 ascend_from_subtype(path);
2220 goto error_parse_next;
2224 /* must be an expression */
2225 expression_t *expression = parse_assignment_expression();
2227 if(env->must_be_constant && !is_initializer_constant(expression)) {
2228 errorf(&expression->base.source_position,
2229 "Initialisation expression '%E' is not constant\n",
2234 /* we are already outside, ... */
2238 /* handle { "string" } special case */
2239 if((expression->kind == EXPR_STRING_LITERAL
2240 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2241 && outer_type != NULL) {
2242 sub = initializer_from_expression(outer_type, expression);
2244 if(token.type == ',') {
2247 if(token.type != '}') {
2248 warningf(HERE, "excessive elements in initializer for type '%T'",
2251 /* TODO: eat , ... */
2256 /* descend into subtypes until expression matches type */
2258 orig_type = path->top_type;
2259 type = skip_typeref(orig_type);
2261 sub = initializer_from_expression(orig_type, expression);
2265 if(!is_type_valid(type)) {
2268 if(is_type_scalar(type)) {
2269 errorf(&expression->base.source_position,
2270 "expression '%E' doesn't match expected type '%T'",
2271 expression, orig_type);
2275 descend_into_subtype(path);
2279 /* update largest index of top array */
2280 const type_path_entry_t *first = &path->path[0];
2281 type_t *first_type = first->type;
2282 first_type = skip_typeref(first_type);
2283 if(is_type_array(first_type)) {
2284 size_t index = first->v.index;
2285 if(index > path->max_index)
2286 path->max_index = index;
2290 /* append to initializers list */
2291 ARR_APP1(initializer_t*, initializers, sub);
2294 if(env->declaration != NULL)
2295 warningf(HERE, "excess elements in struct initializer for '%Y'",
2296 env->declaration->symbol);
2298 warningf(HERE, "excess elements in struct initializer");
2302 if(token.type == '}') {
2306 if(token.type == '}') {
2311 /* advance to the next declaration if we are not at the end */
2312 advance_current_object(path, top_path_level);
2313 orig_type = path->top_type;
2314 if(orig_type != NULL)
2315 type = skip_typeref(orig_type);
2321 size_t len = ARR_LEN(initializers);
2322 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2323 initializer_t *result = allocate_ast_zero(size);
2324 result->kind = INITIALIZER_LIST;
2325 result->list.len = len;
2326 memcpy(&result->list.initializers, initializers,
2327 len * sizeof(initializers[0]));
2329 DEL_ARR_F(initializers);
2330 ascend_to(path, top_path_level+1);
2335 skip_initializers();
2336 DEL_ARR_F(initializers);
2337 ascend_to(path, top_path_level+1);
2342 * Parses an initializer. Parsers either a compound literal
2343 * (env->declaration == NULL) or an initializer of a declaration.
2345 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2347 type_t *type = skip_typeref(env->type);
2348 initializer_t *result = NULL;
2351 if(is_type_scalar(type)) {
2352 result = parse_scalar_initializer(type, env->must_be_constant);
2353 } else if(token.type == '{') {
2357 memset(&path, 0, sizeof(path));
2358 path.top_type = env->type;
2359 path.path = NEW_ARR_F(type_path_entry_t, 0);
2361 descend_into_subtype(&path);
2363 add_anchor_token('}');
2364 result = parse_sub_initializer(&path, env->type, 1, env);
2365 rem_anchor_token('}');
2367 max_index = path.max_index;
2368 DEL_ARR_F(path.path);
2372 /* parse_scalar_initializer() also works in this case: we simply
2373 * have an expression without {} around it */
2374 result = parse_scalar_initializer(type, env->must_be_constant);
2377 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2378 * the array type size */
2379 if(is_type_array(type) && type->array.size_expression == NULL
2380 && result != NULL) {
2382 switch (result->kind) {
2383 case INITIALIZER_LIST:
2384 size = max_index + 1;
2387 case INITIALIZER_STRING:
2388 size = result->string.string.size;
2391 case INITIALIZER_WIDE_STRING:
2392 size = result->wide_string.string.size;
2396 internal_errorf(HERE, "invalid initializer type");
2399 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2400 cnst->base.type = type_size_t;
2401 cnst->conste.v.int_value = size;
2403 type_t *new_type = duplicate_type(type);
2405 new_type->array.size_expression = cnst;
2406 new_type->array.size_constant = true;
2407 new_type->array.size = size;
2408 env->type = new_type;
2416 static declaration_t *append_declaration(declaration_t *declaration);
2418 static declaration_t *parse_compound_type_specifier(bool is_struct)
2420 gnu_attribute_t *attributes = NULL;
2427 symbol_t *symbol = NULL;
2428 declaration_t *declaration = NULL;
2430 if (token.type == T___attribute__) {
2431 parse_attributes(&attributes);
2434 if(token.type == T_IDENTIFIER) {
2435 symbol = token.v.symbol;
2439 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
2441 declaration = get_declaration(symbol, NAMESPACE_UNION);
2443 } else if(token.type != '{') {
2445 parse_error_expected("while parsing struct type specifier",
2446 T_IDENTIFIER, '{', NULL);
2448 parse_error_expected("while parsing union type specifier",
2449 T_IDENTIFIER, '{', NULL);
2455 if(declaration == NULL) {
2456 declaration = allocate_declaration_zero();
2457 declaration->namespc =
2458 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2459 declaration->source_position = token.source_position;
2460 declaration->symbol = symbol;
2461 declaration->parent_scope = scope;
2462 if (symbol != NULL) {
2463 environment_push(declaration);
2465 append_declaration(declaration);
2468 if(token.type == '{') {
2469 if (declaration->init.complete) {
2470 assert(symbol != NULL);
2471 errorf(HERE, "multiple definitions of '%s %Y'",
2472 is_struct ? "struct" : "union", symbol);
2473 declaration->scope.declarations = NULL;
2475 declaration->init.complete = true;
2477 parse_compound_type_entries(declaration);
2478 parse_attributes(&attributes);
2484 static void parse_enum_entries(type_t *const enum_type)
2488 if(token.type == '}') {
2490 errorf(HERE, "empty enum not allowed");
2494 add_anchor_token('}');
2496 if(token.type != T_IDENTIFIER) {
2497 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2499 rem_anchor_token('}');
2503 declaration_t *const entry = allocate_declaration_zero();
2504 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2505 entry->type = enum_type;
2506 entry->symbol = token.v.symbol;
2507 entry->source_position = token.source_position;
2510 if(token.type == '=') {
2512 expression_t *value = parse_constant_expression();
2514 value = create_implicit_cast(value, enum_type);
2515 entry->init.enum_value = value;
2520 record_declaration(entry);
2522 if(token.type != ',')
2525 } while(token.type != '}');
2526 rem_anchor_token('}');
2534 static type_t *parse_enum_specifier(void)
2536 gnu_attribute_t *attributes = NULL;
2537 declaration_t *declaration;
2541 if(token.type == T_IDENTIFIER) {
2542 symbol = token.v.symbol;
2545 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2546 } else if(token.type != '{') {
2547 parse_error_expected("while parsing enum type specifier",
2548 T_IDENTIFIER, '{', NULL);
2555 if(declaration == NULL) {
2556 declaration = allocate_declaration_zero();
2557 declaration->namespc = NAMESPACE_ENUM;
2558 declaration->source_position = token.source_position;
2559 declaration->symbol = symbol;
2560 declaration->parent_scope = scope;
2563 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2564 type->enumt.declaration = declaration;
2566 if(token.type == '{') {
2567 if(declaration->init.complete) {
2568 errorf(HERE, "multiple definitions of enum %Y", symbol);
2570 if (symbol != NULL) {
2571 environment_push(declaration);
2573 append_declaration(declaration);
2574 declaration->init.complete = true;
2576 parse_enum_entries(type);
2577 parse_attributes(&attributes);
2584 * if a symbol is a typedef to another type, return true
2586 static bool is_typedef_symbol(symbol_t *symbol)
2588 const declaration_t *const declaration =
2589 get_declaration(symbol, NAMESPACE_NORMAL);
2591 declaration != NULL &&
2592 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2595 static type_t *parse_typeof(void)
2602 add_anchor_token(')');
2604 expression_t *expression = NULL;
2607 switch(token.type) {
2608 case T___extension__:
2609 /* this can be a prefix to a typename or an expression */
2610 /* we simply eat it now. */
2613 } while(token.type == T___extension__);
2617 if(is_typedef_symbol(token.v.symbol)) {
2618 type = parse_typename();
2620 expression = parse_expression();
2621 type = expression->base.type;
2626 type = parse_typename();
2630 expression = parse_expression();
2631 type = expression->base.type;
2635 rem_anchor_token(')');
2638 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2639 typeof_type->typeoft.expression = expression;
2640 typeof_type->typeoft.typeof_type = type;
2648 SPECIFIER_SIGNED = 1 << 0,
2649 SPECIFIER_UNSIGNED = 1 << 1,
2650 SPECIFIER_LONG = 1 << 2,
2651 SPECIFIER_INT = 1 << 3,
2652 SPECIFIER_DOUBLE = 1 << 4,
2653 SPECIFIER_CHAR = 1 << 5,
2654 SPECIFIER_SHORT = 1 << 6,
2655 SPECIFIER_LONG_LONG = 1 << 7,
2656 SPECIFIER_FLOAT = 1 << 8,
2657 SPECIFIER_BOOL = 1 << 9,
2658 SPECIFIER_VOID = 1 << 10,
2659 SPECIFIER_INT8 = 1 << 11,
2660 SPECIFIER_INT16 = 1 << 12,
2661 SPECIFIER_INT32 = 1 << 13,
2662 SPECIFIER_INT64 = 1 << 14,
2663 SPECIFIER_INT128 = 1 << 15,
2664 SPECIFIER_COMPLEX = 1 << 16,
2665 SPECIFIER_IMAGINARY = 1 << 17,
2668 static type_t *create_builtin_type(symbol_t *const symbol,
2669 type_t *const real_type)
2671 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2672 type->builtin.symbol = symbol;
2673 type->builtin.real_type = real_type;
2675 type_t *result = typehash_insert(type);
2676 if(type != result) {
2683 static type_t *get_typedef_type(symbol_t *symbol)
2685 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2686 if(declaration == NULL ||
2687 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2690 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2691 type->typedeft.declaration = declaration;
2697 * check for the allowed MS alignment values.
2699 static bool check_elignment_value(long long intvalue) {
2700 if(intvalue < 1 || intvalue > 8192) {
2701 errorf(HERE, "illegal alignment value");
2704 unsigned v = (unsigned)intvalue;
2705 for(unsigned i = 1; i <= 8192; i += i) {
2709 errorf(HERE, "alignment must be power of two");
2713 #define DET_MOD(name, tag) do { \
2714 if(*modifiers & tag) warningf(HERE, #name " used more than once"); \
2715 *modifiers |= tag; \
2718 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2720 decl_modifiers_t *modifiers = &specifiers->decl_modifiers;
2723 if(token.type == T_restrict) {
2725 DET_MOD(restrict, DM_RESTRICT);
2727 } else if(token.type != T_IDENTIFIER)
2729 symbol_t *symbol = token.v.symbol;
2730 if(symbol == sym_align) {
2733 if(token.type != T_INTEGER)
2735 if(check_elignment_value(token.v.intvalue)) {
2736 if(specifiers->alignment != 0)
2737 warningf(HERE, "align used more than once");
2738 specifiers->alignment = (unsigned char)token.v.intvalue;
2742 } else if(symbol == sym_allocate) {
2745 if(token.type != T_IDENTIFIER)
2747 (void)token.v.symbol;
2749 } else if(symbol == sym_dllimport) {
2751 DET_MOD(dllimport, DM_DLLIMPORT);
2752 } else if(symbol == sym_dllexport) {
2754 DET_MOD(dllexport, DM_DLLEXPORT);
2755 } else if(symbol == sym_thread) {
2757 DET_MOD(thread, DM_THREAD);
2758 } else if(symbol == sym_naked) {
2760 DET_MOD(naked, DM_NAKED);
2761 } else if(symbol == sym_noinline) {
2763 DET_MOD(noinline, DM_NOINLINE);
2764 } else if(symbol == sym_noreturn) {
2766 DET_MOD(noreturn, DM_NORETURN);
2767 } else if(symbol == sym_nothrow) {
2769 DET_MOD(nothrow, DM_NOTHROW);
2770 } else if(symbol == sym_novtable) {
2772 DET_MOD(novtable, DM_NOVTABLE);
2773 } else if(symbol == sym_property) {
2777 bool is_get = false;
2778 if(token.type != T_IDENTIFIER)
2780 if(token.v.symbol == sym_get) {
2782 } else if(token.v.symbol == sym_put) {
2784 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2789 if(token.type != T_IDENTIFIER)
2792 if(specifiers->get_property_sym != NULL) {
2793 errorf(HERE, "get property name already specified");
2795 specifiers->get_property_sym = token.v.symbol;
2798 if(specifiers->put_property_sym != NULL) {
2799 errorf(HERE, "put property name already specified");
2801 specifiers->put_property_sym = token.v.symbol;
2805 if(token.type == ',') {
2812 } else if(symbol == sym_selectany) {
2814 DET_MOD(selectany, DM_SELECTANY);
2815 } else if(symbol == sym_uuid) {
2818 if(token.type != T_STRING_LITERAL)
2822 } else if(symbol == sym_deprecated) {
2824 if(specifiers->deprecated != 0)
2825 warningf(HERE, "deprecated used more than once");
2826 specifiers->deprecated = 1;
2827 if(token.type == '(') {
2829 if(token.type == T_STRING_LITERAL) {
2830 specifiers->deprecated_string = token.v.string.begin;
2833 errorf(HERE, "string literal expected");
2837 } else if(symbol == sym_noalias) {
2839 DET_MOD(noalias, DM_NOALIAS);
2841 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
2843 if(token.type == '(')
2847 if (token.type == ',')
2854 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
2856 type_t *type = NULL;
2857 unsigned type_qualifiers = 0;
2858 unsigned type_specifiers = 0;
2861 specifiers->source_position = token.source_position;
2864 switch(token.type) {
2867 #define MATCH_STORAGE_CLASS(token, class) \
2869 if(specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
2870 errorf(HERE, "multiple storage classes in declaration specifiers"); \
2872 specifiers->declared_storage_class = class; \
2876 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
2877 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
2878 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
2879 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
2880 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
2885 add_anchor_token(')');
2886 parse_microsoft_extended_decl_modifier(specifiers);
2887 rem_anchor_token(')');
2892 switch (specifiers->declared_storage_class) {
2893 case STORAGE_CLASS_NONE:
2894 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
2897 case STORAGE_CLASS_EXTERN:
2898 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
2901 case STORAGE_CLASS_STATIC:
2902 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
2906 errorf(HERE, "multiple storage classes in declaration specifiers");
2912 /* type qualifiers */
2913 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
2915 type_qualifiers |= qualifier; \
2919 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
2920 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
2921 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
2922 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
2923 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
2924 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
2925 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
2926 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
2928 case T___extension__:
2933 /* type specifiers */
2934 #define MATCH_SPECIFIER(token, specifier, name) \
2937 if(type_specifiers & specifier) { \
2938 errorf(HERE, "multiple " name " type specifiers given"); \
2940 type_specifiers |= specifier; \
2944 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
2945 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
2946 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
2947 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
2948 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
2949 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
2950 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
2951 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
2952 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
2953 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8")
2954 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16")
2955 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32")
2956 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64")
2957 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128")
2958 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
2959 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
2961 case T__forceinline:
2962 /* only in microsoft mode */
2963 specifiers->decl_modifiers |= DM_FORCEINLINE;
2967 specifiers->is_inline = true;
2972 if(type_specifiers & SPECIFIER_LONG_LONG) {
2973 errorf(HERE, "multiple type specifiers given");
2974 } else if(type_specifiers & SPECIFIER_LONG) {
2975 type_specifiers |= SPECIFIER_LONG_LONG;
2977 type_specifiers |= SPECIFIER_LONG;
2982 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
2984 type->compound.declaration = parse_compound_type_specifier(true);
2988 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
2990 type->compound.declaration = parse_compound_type_specifier(false);
2994 type = parse_enum_specifier();
2997 type = parse_typeof();
2999 case T___builtin_va_list:
3000 type = duplicate_type(type_valist);
3004 case T___attribute__:
3005 parse_attributes(&specifiers->gnu_attributes);
3008 case T_IDENTIFIER: {
3009 /* only parse identifier if we haven't found a type yet */
3010 if(type != NULL || type_specifiers != 0)
3011 goto finish_specifiers;
3013 type_t *typedef_type = get_typedef_type(token.v.symbol);
3015 if(typedef_type == NULL)
3016 goto finish_specifiers;
3019 type = typedef_type;
3023 /* function specifier */
3025 goto finish_specifiers;
3032 atomic_type_kind_t atomic_type;
3034 /* match valid basic types */
3035 switch(type_specifiers) {
3036 case SPECIFIER_VOID:
3037 atomic_type = ATOMIC_TYPE_VOID;
3039 case SPECIFIER_CHAR:
3040 atomic_type = ATOMIC_TYPE_CHAR;
3042 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3043 atomic_type = ATOMIC_TYPE_SCHAR;
3045 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3046 atomic_type = ATOMIC_TYPE_UCHAR;
3048 case SPECIFIER_SHORT:
3049 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3050 case SPECIFIER_SHORT | SPECIFIER_INT:
3051 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3052 atomic_type = ATOMIC_TYPE_SHORT;
3054 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3055 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3056 atomic_type = ATOMIC_TYPE_USHORT;
3059 case SPECIFIER_SIGNED:
3060 case SPECIFIER_SIGNED | SPECIFIER_INT:
3061 atomic_type = ATOMIC_TYPE_INT;
3063 case SPECIFIER_UNSIGNED:
3064 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3065 atomic_type = ATOMIC_TYPE_UINT;
3067 case SPECIFIER_LONG:
3068 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3069 case SPECIFIER_LONG | SPECIFIER_INT:
3070 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3071 atomic_type = ATOMIC_TYPE_LONG;
3073 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3074 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3075 atomic_type = ATOMIC_TYPE_ULONG;
3077 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3078 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3079 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3080 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3082 atomic_type = ATOMIC_TYPE_LONGLONG;
3084 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3085 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3087 atomic_type = ATOMIC_TYPE_ULONGLONG;
3090 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3091 atomic_type = unsigned_int8_type_kind;
3094 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3095 atomic_type = unsigned_int16_type_kind;
3098 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3099 atomic_type = unsigned_int32_type_kind;
3102 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3103 atomic_type = unsigned_int64_type_kind;
3106 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3107 atomic_type = unsigned_int128_type_kind;
3110 case SPECIFIER_INT8:
3111 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3112 atomic_type = int8_type_kind;
3115 case SPECIFIER_INT16:
3116 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3117 atomic_type = int16_type_kind;
3120 case SPECIFIER_INT32:
3121 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3122 atomic_type = int32_type_kind;
3125 case SPECIFIER_INT64:
3126 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3127 atomic_type = int64_type_kind;
3130 case SPECIFIER_INT128:
3131 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3132 atomic_type = int128_type_kind;
3135 case SPECIFIER_FLOAT:
3136 atomic_type = ATOMIC_TYPE_FLOAT;
3138 case SPECIFIER_DOUBLE:
3139 atomic_type = ATOMIC_TYPE_DOUBLE;
3141 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3142 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3144 case SPECIFIER_BOOL:
3145 atomic_type = ATOMIC_TYPE_BOOL;
3147 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3148 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3149 atomic_type = ATOMIC_TYPE_FLOAT;
3151 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3152 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3153 atomic_type = ATOMIC_TYPE_DOUBLE;
3155 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3156 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3157 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3160 /* invalid specifier combination, give an error message */
3161 if(type_specifiers == 0) {
3162 if (! strict_mode) {
3163 if (warning.implicit_int) {
3164 warningf(HERE, "no type specifiers in declaration, using 'int'");
3166 atomic_type = ATOMIC_TYPE_INT;
3169 errorf(HERE, "no type specifiers given in declaration");
3171 } else if((type_specifiers & SPECIFIER_SIGNED) &&
3172 (type_specifiers & SPECIFIER_UNSIGNED)) {
3173 errorf(HERE, "signed and unsigned specifiers gives");
3174 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3175 errorf(HERE, "only integer types can be signed or unsigned");
3177 errorf(HERE, "multiple datatypes in declaration");
3179 atomic_type = ATOMIC_TYPE_INVALID;
3182 if(type_specifiers & SPECIFIER_COMPLEX &&
3183 atomic_type != ATOMIC_TYPE_INVALID) {
3184 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3185 type->complex.akind = atomic_type;
3186 } else if(type_specifiers & SPECIFIER_IMAGINARY &&
3187 atomic_type != ATOMIC_TYPE_INVALID) {
3188 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3189 type->imaginary.akind = atomic_type;
3191 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3192 type->atomic.akind = atomic_type;
3196 if(type_specifiers != 0) {
3197 errorf(HERE, "multiple datatypes in declaration");
3201 type->base.qualifiers = type_qualifiers;
3202 /* FIXME: check type qualifiers here */
3204 type_t *result = typehash_insert(type);
3205 if(newtype && result != type) {
3209 specifiers->type = result;
3214 static type_qualifiers_t parse_type_qualifiers(void)
3216 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
3219 switch(token.type) {
3220 /* type qualifiers */
3221 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3222 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3223 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3224 /* microsoft extended type modifiers */
3225 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3226 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3227 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3228 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3229 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3232 return type_qualifiers;
3237 static declaration_t *parse_identifier_list(void)
3239 declaration_t *declarations = NULL;
3240 declaration_t *last_declaration = NULL;
3242 declaration_t *const declaration = allocate_declaration_zero();
3243 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3244 declaration->source_position = token.source_position;
3245 declaration->symbol = token.v.symbol;
3248 if(last_declaration != NULL) {
3249 last_declaration->next = declaration;
3251 declarations = declaration;
3253 last_declaration = declaration;
3255 if (token.type != ',') {
3259 } while(token.type == T_IDENTIFIER);
3261 return declarations;
3264 static void semantic_parameter(declaration_t *declaration)
3266 /* TODO: improve error messages */
3268 if(declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3269 errorf(HERE, "typedef not allowed in parameter list");
3270 } else if(declaration->declared_storage_class != STORAGE_CLASS_NONE
3271 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3272 errorf(HERE, "parameter may only have none or register storage class");
3275 type_t *const orig_type = declaration->type;
3276 type_t * type = skip_typeref(orig_type);
3278 /* Array as last part of a parameter type is just syntactic sugar. Turn it
3279 * into a pointer. § 6.7.5.3 (7) */
3280 if (is_type_array(type)) {
3281 type_t *const element_type = type->array.element_type;
3283 type = make_pointer_type(element_type, type->base.qualifiers);
3285 declaration->type = type;
3288 if(is_type_incomplete(type)) {
3289 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3290 orig_type, declaration->symbol);
3294 static declaration_t *parse_parameter(void)
3296 declaration_specifiers_t specifiers;
3297 memset(&specifiers, 0, sizeof(specifiers));
3299 parse_declaration_specifiers(&specifiers);
3301 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3303 semantic_parameter(declaration);
3308 static declaration_t *parse_parameters(function_type_t *type)
3310 declaration_t *declarations = NULL;
3313 add_anchor_token(')');
3314 int saved_comma_state = save_and_reset_anchor_state(',');
3316 if(token.type == T_IDENTIFIER) {
3317 symbol_t *symbol = token.v.symbol;
3318 if(!is_typedef_symbol(symbol)) {
3319 type->kr_style_parameters = true;
3320 declarations = parse_identifier_list();
3321 goto parameters_finished;
3325 if(token.type == ')') {
3326 type->unspecified_parameters = 1;
3327 goto parameters_finished;
3329 if(token.type == T_void && look_ahead(1)->type == ')') {
3331 goto parameters_finished;
3334 declaration_t *declaration;
3335 declaration_t *last_declaration = NULL;
3336 function_parameter_t *parameter;
3337 function_parameter_t *last_parameter = NULL;
3340 switch(token.type) {
3344 goto parameters_finished;
3347 case T___extension__:
3349 declaration = parse_parameter();
3351 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3352 memset(parameter, 0, sizeof(parameter[0]));
3353 parameter->type = declaration->type;
3355 if(last_parameter != NULL) {
3356 last_declaration->next = declaration;
3357 last_parameter->next = parameter;
3359 type->parameters = parameter;
3360 declarations = declaration;
3362 last_parameter = parameter;
3363 last_declaration = declaration;
3367 goto parameters_finished;
3369 if (token.type != ',') {
3370 goto parameters_finished;
3376 parameters_finished:
3377 rem_anchor_token(')');
3380 restore_anchor_state(',', saved_comma_state);
3381 return declarations;
3384 restore_anchor_state(',', saved_comma_state);
3393 } construct_type_kind_t;
3395 typedef struct construct_type_t construct_type_t;
3396 struct construct_type_t {
3397 construct_type_kind_t kind;
3398 construct_type_t *next;
3401 typedef struct parsed_pointer_t parsed_pointer_t;
3402 struct parsed_pointer_t {
3403 construct_type_t construct_type;
3404 type_qualifiers_t type_qualifiers;
3407 typedef struct construct_function_type_t construct_function_type_t;
3408 struct construct_function_type_t {
3409 construct_type_t construct_type;
3410 type_t *function_type;
3413 typedef struct parsed_array_t parsed_array_t;
3414 struct parsed_array_t {
3415 construct_type_t construct_type;
3416 type_qualifiers_t type_qualifiers;
3422 typedef struct construct_base_type_t construct_base_type_t;
3423 struct construct_base_type_t {
3424 construct_type_t construct_type;
3428 static construct_type_t *parse_pointer_declarator(void)
3432 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3433 memset(pointer, 0, sizeof(pointer[0]));
3434 pointer->construct_type.kind = CONSTRUCT_POINTER;
3435 pointer->type_qualifiers = parse_type_qualifiers();
3437 return (construct_type_t*) pointer;
3440 static construct_type_t *parse_array_declarator(void)
3443 add_anchor_token(']');
3445 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3446 memset(array, 0, sizeof(array[0]));
3447 array->construct_type.kind = CONSTRUCT_ARRAY;
3449 if(token.type == T_static) {
3450 array->is_static = true;
3454 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3455 if(type_qualifiers != 0) {
3456 if(token.type == T_static) {
3457 array->is_static = true;
3461 array->type_qualifiers = type_qualifiers;
3463 if(token.type == '*' && look_ahead(1)->type == ']') {
3464 array->is_variable = true;
3466 } else if(token.type != ']') {
3467 array->size = parse_assignment_expression();
3470 rem_anchor_token(']');
3473 return (construct_type_t*) array;
3478 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3481 if(declaration != NULL) {
3482 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3484 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3487 declaration_t *parameters = parse_parameters(&type->function);
3488 if(declaration != NULL) {
3489 declaration->scope.declarations = parameters;
3492 construct_function_type_t *construct_function_type =
3493 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3494 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3495 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3496 construct_function_type->function_type = type;
3498 return (construct_type_t*) construct_function_type;
3501 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3502 bool may_be_abstract)
3504 /* construct a single linked list of construct_type_t's which describe
3505 * how to construct the final declarator type */
3506 construct_type_t *first = NULL;
3507 construct_type_t *last = NULL;
3508 gnu_attribute_t *attributes = NULL;
3511 while(token.type == '*') {
3512 construct_type_t *type = parse_pointer_declarator();
3523 /* TODO: find out if this is correct */
3524 parse_attributes(&attributes);
3526 construct_type_t *inner_types = NULL;
3528 switch(token.type) {
3530 if(declaration == NULL) {
3531 errorf(HERE, "no identifier expected in typename");
3533 declaration->symbol = token.v.symbol;
3534 declaration->source_position = token.source_position;
3540 add_anchor_token(')');
3541 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3542 rem_anchor_token(')');
3548 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3549 /* avoid a loop in the outermost scope, because eat_statement doesn't
3551 if(token.type == '}' && current_function == NULL) {
3559 construct_type_t *p = last;
3562 construct_type_t *type;
3563 switch(token.type) {
3565 type = parse_function_declarator(declaration);
3568 type = parse_array_declarator();
3571 goto declarator_finished;
3574 /* insert in the middle of the list (behind p) */
3576 type->next = p->next;
3587 declarator_finished:
3588 parse_attributes(&attributes);
3590 /* append inner_types at the end of the list, we don't to set last anymore
3591 * as it's not needed anymore */
3593 assert(first == NULL);
3594 first = inner_types;
3596 last->next = inner_types;
3604 static type_t *construct_declarator_type(construct_type_t *construct_list,
3607 construct_type_t *iter = construct_list;
3608 for( ; iter != NULL; iter = iter->next) {
3609 switch(iter->kind) {
3610 case CONSTRUCT_INVALID:
3611 internal_errorf(HERE, "invalid type construction found");
3612 case CONSTRUCT_FUNCTION: {
3613 construct_function_type_t *construct_function_type
3614 = (construct_function_type_t*) iter;
3616 type_t *function_type = construct_function_type->function_type;
3618 function_type->function.return_type = type;
3620 type_t *skipped_return_type = skip_typeref(type);
3621 if (is_type_function(skipped_return_type)) {
3622 errorf(HERE, "function returning function is not allowed");
3623 type = type_error_type;
3624 } else if (is_type_array(skipped_return_type)) {
3625 errorf(HERE, "function returning array is not allowed");
3626 type = type_error_type;
3628 type = function_type;
3633 case CONSTRUCT_POINTER: {
3634 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3635 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3636 pointer_type->pointer.points_to = type;
3637 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3639 type = pointer_type;
3643 case CONSTRUCT_ARRAY: {
3644 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3645 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3647 expression_t *size_expression = parsed_array->size;
3648 if(size_expression != NULL) {
3650 = create_implicit_cast(size_expression, type_size_t);
3653 array_type->base.qualifiers = parsed_array->type_qualifiers;
3654 array_type->array.element_type = type;
3655 array_type->array.is_static = parsed_array->is_static;
3656 array_type->array.is_variable = parsed_array->is_variable;
3657 array_type->array.size_expression = size_expression;
3659 if(size_expression != NULL) {
3660 if(is_constant_expression(size_expression)) {
3661 array_type->array.size_constant = true;
3662 array_type->array.size
3663 = fold_constant(size_expression);
3665 array_type->array.is_vla = true;
3669 type_t *skipped_type = skip_typeref(type);
3670 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3671 errorf(HERE, "array of void is not allowed");
3672 type = type_error_type;
3680 type_t *hashed_type = typehash_insert(type);
3681 if(hashed_type != type) {
3682 /* the function type was constructed earlier freeing it here will
3683 * destroy other types... */
3684 if(iter->kind != CONSTRUCT_FUNCTION) {
3694 static declaration_t *parse_declarator(
3695 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3697 declaration_t *const declaration = allocate_declaration_zero();
3698 declaration->declared_storage_class = specifiers->declared_storage_class;
3699 declaration->decl_modifiers = specifiers->decl_modifiers;
3700 declaration->deprecated = specifiers->deprecated;
3701 declaration->deprecated_string = specifiers->deprecated_string;
3702 declaration->get_property_sym = specifiers->get_property_sym;
3703 declaration->put_property_sym = specifiers->put_property_sym;
3704 declaration->is_inline = specifiers->is_inline;
3706 declaration->storage_class = specifiers->declared_storage_class;
3707 if(declaration->storage_class == STORAGE_CLASS_NONE
3708 && scope != global_scope) {
3709 declaration->storage_class = STORAGE_CLASS_AUTO;
3712 if(specifiers->alignment != 0) {
3713 /* TODO: add checks here */
3714 declaration->alignment = specifiers->alignment;
3717 construct_type_t *construct_type
3718 = parse_inner_declarator(declaration, may_be_abstract);
3719 type_t *const type = specifiers->type;
3720 declaration->type = construct_declarator_type(construct_type, type);
3722 if(construct_type != NULL) {
3723 obstack_free(&temp_obst, construct_type);
3729 static type_t *parse_abstract_declarator(type_t *base_type)
3731 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
3733 type_t *result = construct_declarator_type(construct_type, base_type);
3734 if(construct_type != NULL) {
3735 obstack_free(&temp_obst, construct_type);
3741 static declaration_t *append_declaration(declaration_t* const declaration)
3743 if (last_declaration != NULL) {
3744 last_declaration->next = declaration;
3746 scope->declarations = declaration;
3748 last_declaration = declaration;
3753 * Check if the declaration of main is suspicious. main should be a
3754 * function with external linkage, returning int, taking either zero
3755 * arguments, two, or three arguments of appropriate types, ie.
3757 * int main([ int argc, char **argv [, char **env ] ]).
3759 * @param decl the declaration to check
3760 * @param type the function type of the declaration
3762 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
3764 if (decl->storage_class == STORAGE_CLASS_STATIC) {
3765 warningf(&decl->source_position,
3766 "'main' is normally a non-static function");
3768 if (skip_typeref(func_type->return_type) != type_int) {
3769 warningf(&decl->source_position,
3770 "return type of 'main' should be 'int', but is '%T'",
3771 func_type->return_type);
3773 const function_parameter_t *parm = func_type->parameters;
3775 type_t *const first_type = parm->type;
3776 if (!types_compatible(skip_typeref(first_type), type_int)) {
3777 warningf(&decl->source_position,
3778 "first argument of 'main' should be 'int', but is '%T'", first_type);
3782 type_t *const second_type = parm->type;
3783 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
3784 warningf(&decl->source_position,
3785 "second argument of 'main' should be 'char**', but is '%T'", second_type);
3789 type_t *const third_type = parm->type;
3790 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
3791 warningf(&decl->source_position,
3792 "third argument of 'main' should be 'char**', but is '%T'", third_type);
3796 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3800 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3806 * Check if a symbol is the equal to "main".
3808 static bool is_sym_main(const symbol_t *const sym)
3810 return strcmp(sym->string, "main") == 0;
3813 static declaration_t *internal_record_declaration(
3814 declaration_t *const declaration,
3815 const bool is_function_definition)
3817 const symbol_t *const symbol = declaration->symbol;
3818 const namespace_t namespc = (namespace_t)declaration->namespc;
3820 assert(declaration->symbol != NULL);
3821 declaration_t *previous_declaration = get_declaration(symbol, namespc);
3823 type_t *const orig_type = declaration->type;
3824 type_t *const type = skip_typeref(orig_type);
3825 if (is_type_function(type) &&
3826 type->function.unspecified_parameters &&
3827 warning.strict_prototypes &&
3828 previous_declaration == NULL) {
3829 warningf(&declaration->source_position,
3830 "function declaration '%#T' is not a prototype",
3831 orig_type, declaration->symbol);
3834 if (is_function_definition && warning.main && is_sym_main(symbol)) {
3835 check_type_of_main(declaration, &type->function);
3838 assert(declaration != previous_declaration);
3839 if (previous_declaration != NULL
3840 && previous_declaration->parent_scope == scope) {
3841 /* can happen for K&R style declarations */
3842 if (previous_declaration->type == NULL) {
3843 previous_declaration->type = declaration->type;
3846 const type_t *prev_type = skip_typeref(previous_declaration->type);
3847 if (!types_compatible(type, prev_type)) {
3848 errorf(&declaration->source_position,
3849 "declaration '%#T' is incompatible with '%#T' (declared %P)",
3850 orig_type, symbol, previous_declaration->type, symbol,
3851 &previous_declaration->source_position);
3853 unsigned old_storage_class = previous_declaration->storage_class;
3854 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
3855 errorf(&declaration->source_position,
3856 "redeclaration of enum entry '%Y' (declared %P)",
3857 symbol, &previous_declaration->source_position);
3858 return previous_declaration;
3861 unsigned new_storage_class = declaration->storage_class;
3863 if (is_type_incomplete(prev_type)) {
3864 previous_declaration->type = type;
3868 /* pretend no storage class means extern for function
3869 * declarations (except if the previous declaration is neither
3870 * none nor extern) */
3871 if (is_type_function(type)) {
3872 if (prev_type->function.unspecified_parameters) {
3873 previous_declaration->type = type;
3877 switch (old_storage_class) {
3878 case STORAGE_CLASS_NONE:
3879 old_storage_class = STORAGE_CLASS_EXTERN;
3881 case STORAGE_CLASS_EXTERN:
3882 if (is_function_definition) {
3883 if (warning.missing_prototypes &&
3884 prev_type->function.unspecified_parameters &&
3885 !is_sym_main(symbol)) {
3886 warningf(&declaration->source_position,
3887 "no previous prototype for '%#T'",
3890 } else if (new_storage_class == STORAGE_CLASS_NONE) {
3891 new_storage_class = STORAGE_CLASS_EXTERN;
3900 if (old_storage_class == STORAGE_CLASS_EXTERN &&
3901 new_storage_class == STORAGE_CLASS_EXTERN) {
3902 warn_redundant_declaration:
3903 if (warning.redundant_decls) {
3904 warningf(&declaration->source_position,
3905 "redundant declaration for '%Y' (declared %P)",
3906 symbol, &previous_declaration->source_position);
3908 } else if (current_function == NULL) {
3909 if (old_storage_class != STORAGE_CLASS_STATIC &&
3910 new_storage_class == STORAGE_CLASS_STATIC) {
3911 errorf(&declaration->source_position,
3912 "static declaration of '%Y' follows non-static declaration (declared %P)",
3913 symbol, &previous_declaration->source_position);
3914 } else if (old_storage_class != STORAGE_CLASS_EXTERN
3915 && !is_function_definition) {
3916 goto warn_redundant_declaration;
3917 } else if (new_storage_class == STORAGE_CLASS_NONE) {
3918 previous_declaration->storage_class = STORAGE_CLASS_NONE;
3919 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
3921 } else if (old_storage_class == new_storage_class) {
3922 errorf(&declaration->source_position,
3923 "redeclaration of '%Y' (declared %P)",
3924 symbol, &previous_declaration->source_position);
3926 errorf(&declaration->source_position,
3927 "redeclaration of '%Y' with different linkage (declared %P)",
3928 symbol, &previous_declaration->source_position);
3932 if (declaration->is_inline)
3933 previous_declaration->is_inline = true;
3934 return previous_declaration;
3935 } else if (is_function_definition) {
3936 if (declaration->storage_class != STORAGE_CLASS_STATIC) {
3937 if (warning.missing_prototypes && !is_sym_main(symbol)) {
3938 warningf(&declaration->source_position,
3939 "no previous prototype for '%#T'", orig_type, symbol);
3940 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
3941 warningf(&declaration->source_position,
3942 "no previous declaration for '%#T'", orig_type,
3946 } else if (warning.missing_declarations &&
3947 scope == global_scope &&
3948 !is_type_function(type) && (
3949 declaration->storage_class == STORAGE_CLASS_NONE ||
3950 declaration->storage_class == STORAGE_CLASS_THREAD
3952 warningf(&declaration->source_position,
3953 "no previous declaration for '%#T'", orig_type, symbol);
3956 assert(declaration->parent_scope == NULL);
3957 assert(scope != NULL);
3959 declaration->parent_scope = scope;
3961 environment_push(declaration);
3962 return append_declaration(declaration);
3965 static declaration_t *record_declaration(declaration_t *declaration)
3967 return internal_record_declaration(declaration, false);
3970 static declaration_t *record_function_definition(declaration_t *declaration)
3972 return internal_record_declaration(declaration, true);
3975 static void parser_error_multiple_definition(declaration_t *declaration,
3976 const source_position_t *source_position)
3978 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
3979 declaration->symbol, &declaration->source_position);
3982 static bool is_declaration_specifier(const token_t *token,
3983 bool only_specifiers_qualifiers)
3985 switch(token->type) {
3990 return is_typedef_symbol(token->v.symbol);
3992 case T___extension__:
3994 return !only_specifiers_qualifiers;
4001 static void parse_init_declarator_rest(declaration_t *declaration)
4005 type_t *orig_type = declaration->type;
4006 type_t *type = skip_typeref(orig_type);
4008 if(declaration->init.initializer != NULL) {
4009 parser_error_multiple_definition(declaration, HERE);
4012 bool must_be_constant = false;
4013 if(declaration->storage_class == STORAGE_CLASS_STATIC
4014 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4015 || declaration->parent_scope == global_scope) {
4016 must_be_constant = true;
4019 parse_initializer_env_t env;
4020 env.type = orig_type;
4021 env.must_be_constant = must_be_constant;
4022 env.declaration = declaration;
4024 initializer_t *initializer = parse_initializer(&env);
4026 if(env.type != orig_type) {
4027 orig_type = env.type;
4028 type = skip_typeref(orig_type);
4029 declaration->type = env.type;
4032 if(is_type_function(type)) {
4033 errorf(&declaration->source_position,
4034 "initializers not allowed for function types at declator '%Y' (type '%T')",
4035 declaration->symbol, orig_type);
4037 declaration->init.initializer = initializer;
4041 /* parse rest of a declaration without any declarator */
4042 static void parse_anonymous_declaration_rest(
4043 const declaration_specifiers_t *specifiers,
4044 parsed_declaration_func finished_declaration)
4048 declaration_t *const declaration = allocate_declaration_zero();
4049 declaration->type = specifiers->type;
4050 declaration->declared_storage_class = specifiers->declared_storage_class;
4051 declaration->source_position = specifiers->source_position;
4052 declaration->decl_modifiers = specifiers->decl_modifiers;
4054 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4055 warningf(&declaration->source_position,
4056 "useless storage class in empty declaration");
4058 declaration->storage_class = STORAGE_CLASS_NONE;
4060 type_t *type = declaration->type;
4061 switch (type->kind) {
4062 case TYPE_COMPOUND_STRUCT:
4063 case TYPE_COMPOUND_UNION: {
4064 if (type->compound.declaration->symbol == NULL) {
4065 warningf(&declaration->source_position,
4066 "unnamed struct/union that defines no instances");
4075 warningf(&declaration->source_position, "empty declaration");
4079 finished_declaration(declaration);
4082 static void parse_declaration_rest(declaration_t *ndeclaration,
4083 const declaration_specifiers_t *specifiers,
4084 parsed_declaration_func finished_declaration)
4086 add_anchor_token(';');
4087 add_anchor_token('=');
4088 add_anchor_token(',');
4090 declaration_t *declaration = finished_declaration(ndeclaration);
4092 type_t *orig_type = declaration->type;
4093 type_t *type = skip_typeref(orig_type);
4095 if (type->kind != TYPE_FUNCTION &&
4096 declaration->is_inline &&
4097 is_type_valid(type)) {
4098 warningf(&declaration->source_position,
4099 "variable '%Y' declared 'inline'\n", declaration->symbol);
4102 if(token.type == '=') {
4103 parse_init_declarator_rest(declaration);
4106 if(token.type != ',')
4110 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4115 rem_anchor_token(';');
4116 rem_anchor_token('=');
4117 rem_anchor_token(',');
4120 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4122 symbol_t *symbol = declaration->symbol;
4123 if(symbol == NULL) {
4124 errorf(HERE, "anonymous declaration not valid as function parameter");
4127 namespace_t namespc = (namespace_t) declaration->namespc;
4128 if(namespc != NAMESPACE_NORMAL) {
4129 return record_declaration(declaration);
4132 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4133 if(previous_declaration == NULL ||
4134 previous_declaration->parent_scope != scope) {
4135 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4140 if(previous_declaration->type == NULL) {
4141 previous_declaration->type = declaration->type;
4142 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4143 previous_declaration->storage_class = declaration->storage_class;
4144 previous_declaration->parent_scope = scope;
4145 return previous_declaration;
4147 return record_declaration(declaration);
4151 static void parse_declaration(parsed_declaration_func finished_declaration)
4153 declaration_specifiers_t specifiers;
4154 memset(&specifiers, 0, sizeof(specifiers));
4155 parse_declaration_specifiers(&specifiers);
4157 if(token.type == ';') {
4158 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4160 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4161 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4165 static type_t *get_default_promoted_type(type_t *orig_type)
4167 type_t *result = orig_type;
4169 type_t *type = skip_typeref(orig_type);
4170 if(is_type_integer(type)) {
4171 result = promote_integer(type);
4172 } else if(type == type_float) {
4173 result = type_double;
4179 static void parse_kr_declaration_list(declaration_t *declaration)
4181 type_t *type = skip_typeref(declaration->type);
4182 if (!is_type_function(type))
4185 if (!type->function.kr_style_parameters)
4188 /* push function parameters */
4189 int top = environment_top();
4190 scope_t *last_scope = scope;
4191 set_scope(&declaration->scope);
4193 declaration_t *parameter = declaration->scope.declarations;
4194 for ( ; parameter != NULL; parameter = parameter->next) {
4195 assert(parameter->parent_scope == NULL);
4196 parameter->parent_scope = scope;
4197 environment_push(parameter);
4200 /* parse declaration list */
4201 while (is_declaration_specifier(&token, false)) {
4202 parse_declaration(finished_kr_declaration);
4205 /* pop function parameters */
4206 assert(scope == &declaration->scope);
4207 set_scope(last_scope);
4208 environment_pop_to(top);
4210 /* update function type */
4211 type_t *new_type = duplicate_type(type);
4213 function_parameter_t *parameters = NULL;
4214 function_parameter_t *last_parameter = NULL;
4216 declaration_t *parameter_declaration = declaration->scope.declarations;
4217 for( ; parameter_declaration != NULL;
4218 parameter_declaration = parameter_declaration->next) {
4219 type_t *parameter_type = parameter_declaration->type;
4220 if(parameter_type == NULL) {
4222 errorf(HERE, "no type specified for function parameter '%Y'",
4223 parameter_declaration->symbol);
4225 if (warning.implicit_int) {
4226 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4227 parameter_declaration->symbol);
4229 parameter_type = type_int;
4230 parameter_declaration->type = parameter_type;
4234 semantic_parameter(parameter_declaration);
4235 parameter_type = parameter_declaration->type;
4238 * we need the default promoted types for the function type
4240 parameter_type = get_default_promoted_type(parameter_type);
4242 function_parameter_t *function_parameter
4243 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4244 memset(function_parameter, 0, sizeof(function_parameter[0]));
4246 function_parameter->type = parameter_type;
4247 if(last_parameter != NULL) {
4248 last_parameter->next = function_parameter;
4250 parameters = function_parameter;
4252 last_parameter = function_parameter;
4255 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4257 new_type->function.parameters = parameters;
4258 new_type->function.unspecified_parameters = true;
4260 type = typehash_insert(new_type);
4261 if(type != new_type) {
4262 obstack_free(type_obst, new_type);
4265 declaration->type = type;
4268 static bool first_err = true;
4271 * When called with first_err set, prints the name of the current function,
4274 static void print_in_function(void) {
4277 diagnosticf("%s: In function '%Y':\n",
4278 current_function->source_position.input_name,
4279 current_function->symbol);
4284 * Check if all labels are defined in the current function.
4285 * Check if all labels are used in the current function.
4287 static void check_labels(void)
4289 for (const goto_statement_t *goto_statement = goto_first;
4290 goto_statement != NULL;
4291 goto_statement = goto_statement->next) {
4292 declaration_t *label = goto_statement->label;
4295 if (label->source_position.input_name == NULL) {
4296 print_in_function();
4297 errorf(&goto_statement->base.source_position,
4298 "label '%Y' used but not defined", label->symbol);
4301 goto_first = goto_last = NULL;
4303 if (warning.unused_label) {
4304 for (const label_statement_t *label_statement = label_first;
4305 label_statement != NULL;
4306 label_statement = label_statement->next) {
4307 const declaration_t *label = label_statement->label;
4309 if (! label->used) {
4310 print_in_function();
4311 warningf(&label_statement->base.source_position,
4312 "label '%Y' defined but not used", label->symbol);
4316 label_first = label_last = NULL;
4320 * Check declarations of current_function for unused entities.
4322 static void check_declarations(void)
4324 if (warning.unused_parameter) {
4325 const scope_t *scope = ¤t_function->scope;
4327 const declaration_t *parameter = scope->declarations;
4328 for (; parameter != NULL; parameter = parameter->next) {
4329 if (! parameter->used) {
4330 print_in_function();
4331 warningf(¶meter->source_position,
4332 "unused parameter '%Y'", parameter->symbol);
4336 if (warning.unused_variable) {
4340 static void parse_external_declaration(void)
4342 /* function-definitions and declarations both start with declaration
4344 declaration_specifiers_t specifiers;
4345 memset(&specifiers, 0, sizeof(specifiers));
4347 add_anchor_token(';');
4348 parse_declaration_specifiers(&specifiers);
4349 rem_anchor_token(';');
4351 /* must be a declaration */
4352 if(token.type == ';') {
4353 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4357 add_anchor_token(',');
4358 add_anchor_token('=');
4359 rem_anchor_token(';');
4361 /* declarator is common to both function-definitions and declarations */
4362 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4364 rem_anchor_token(',');
4365 rem_anchor_token('=');
4366 rem_anchor_token(';');
4368 /* must be a declaration */
4369 if(token.type == ',' || token.type == '=' || token.type == ';') {
4370 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4374 /* must be a function definition */
4375 parse_kr_declaration_list(ndeclaration);
4377 if(token.type != '{') {
4378 parse_error_expected("while parsing function definition", '{', NULL);
4379 eat_until_matching_token(';');
4383 type_t *type = ndeclaration->type;
4385 /* note that we don't skip typerefs: the standard doesn't allow them here
4386 * (so we can't use is_type_function here) */
4387 if(type->kind != TYPE_FUNCTION) {
4388 if (is_type_valid(type)) {
4389 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4390 type, ndeclaration->symbol);
4396 /* § 6.7.5.3 (14) a function definition with () means no
4397 * parameters (and not unspecified parameters) */
4398 if(type->function.unspecified_parameters
4399 && type->function.parameters == NULL
4400 && !type->function.kr_style_parameters) {
4401 type_t *duplicate = duplicate_type(type);
4402 duplicate->function.unspecified_parameters = false;
4404 type = typehash_insert(duplicate);
4405 if(type != duplicate) {
4406 obstack_free(type_obst, duplicate);
4408 ndeclaration->type = type;
4411 declaration_t *const declaration = record_function_definition(ndeclaration);
4412 if(ndeclaration != declaration) {
4413 declaration->scope = ndeclaration->scope;
4415 type = skip_typeref(declaration->type);
4417 /* push function parameters and switch scope */
4418 int top = environment_top();
4419 scope_t *last_scope = scope;
4420 set_scope(&declaration->scope);
4422 declaration_t *parameter = declaration->scope.declarations;
4423 for( ; parameter != NULL; parameter = parameter->next) {
4424 if(parameter->parent_scope == &ndeclaration->scope) {
4425 parameter->parent_scope = scope;
4427 assert(parameter->parent_scope == NULL
4428 || parameter->parent_scope == scope);
4429 parameter->parent_scope = scope;
4430 environment_push(parameter);
4433 if(declaration->init.statement != NULL) {
4434 parser_error_multiple_definition(declaration, HERE);
4436 goto end_of_parse_external_declaration;
4438 /* parse function body */
4439 int label_stack_top = label_top();
4440 declaration_t *old_current_function = current_function;
4441 current_function = declaration;
4443 declaration->init.statement = parse_compound_statement(false);
4446 check_declarations();
4448 assert(current_function == declaration);
4449 current_function = old_current_function;
4450 label_pop_to(label_stack_top);
4453 end_of_parse_external_declaration:
4454 assert(scope == &declaration->scope);
4455 set_scope(last_scope);
4456 environment_pop_to(top);
4459 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4460 source_position_t *source_position)
4462 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4464 type->bitfield.base_type = base_type;
4465 type->bitfield.size = size;
4470 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4473 declaration_t *iter = compound_declaration->scope.declarations;
4474 for( ; iter != NULL; iter = iter->next) {
4475 if(iter->namespc != NAMESPACE_NORMAL)
4478 if(iter->symbol == NULL) {
4479 type_t *type = skip_typeref(iter->type);
4480 if(is_type_compound(type)) {
4481 declaration_t *result
4482 = find_compound_entry(type->compound.declaration, symbol);
4489 if(iter->symbol == symbol) {
4497 static void parse_compound_declarators(declaration_t *struct_declaration,
4498 const declaration_specifiers_t *specifiers)
4500 declaration_t *last_declaration = struct_declaration->scope.declarations;
4501 if(last_declaration != NULL) {
4502 while(last_declaration->next != NULL) {
4503 last_declaration = last_declaration->next;
4508 declaration_t *declaration;
4510 if(token.type == ':') {
4511 source_position_t source_position = *HERE;
4514 type_t *base_type = specifiers->type;
4515 expression_t *size = parse_constant_expression();
4517 if(!is_type_integer(skip_typeref(base_type))) {
4518 errorf(HERE, "bitfield base type '%T' is not an integer type",
4522 type_t *type = make_bitfield_type(base_type, size, &source_position);
4524 declaration = allocate_declaration_zero();
4525 declaration->namespc = NAMESPACE_NORMAL;
4526 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4527 declaration->storage_class = STORAGE_CLASS_NONE;
4528 declaration->source_position = source_position;
4529 declaration->decl_modifiers = specifiers->decl_modifiers;
4530 declaration->type = type;
4532 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4534 type_t *orig_type = declaration->type;
4535 type_t *type = skip_typeref(orig_type);
4537 if(token.type == ':') {
4538 source_position_t source_position = *HERE;
4540 expression_t *size = parse_constant_expression();
4542 if(!is_type_integer(type)) {
4543 errorf(HERE, "bitfield base type '%T' is not an "
4544 "integer type", orig_type);
4547 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4548 declaration->type = bitfield_type;
4550 /* TODO we ignore arrays for now... what is missing is a check
4551 * that they're at the end of the struct */
4552 if(is_type_incomplete(type) && !is_type_array(type)) {
4554 "compound member '%Y' has incomplete type '%T'",
4555 declaration->symbol, orig_type);
4556 } else if(is_type_function(type)) {
4557 errorf(HERE, "compound member '%Y' must not have function "
4558 "type '%T'", declaration->symbol, orig_type);
4563 /* make sure we don't define a symbol multiple times */
4564 symbol_t *symbol = declaration->symbol;
4565 if(symbol != NULL) {
4566 declaration_t *prev_decl
4567 = find_compound_entry(struct_declaration, symbol);
4569 if(prev_decl != NULL) {
4570 assert(prev_decl->symbol == symbol);
4571 errorf(&declaration->source_position,
4572 "multiple declarations of symbol '%Y' (declared %P)",
4573 symbol, &prev_decl->source_position);
4577 /* append declaration */
4578 if(last_declaration != NULL) {
4579 last_declaration->next = declaration;
4581 struct_declaration->scope.declarations = declaration;
4583 last_declaration = declaration;
4585 if(token.type != ',')
4595 static void parse_compound_type_entries(declaration_t *compound_declaration)
4598 add_anchor_token('}');
4600 while(token.type != '}' && token.type != T_EOF) {
4601 declaration_specifiers_t specifiers;
4602 memset(&specifiers, 0, sizeof(specifiers));
4603 parse_declaration_specifiers(&specifiers);
4605 parse_compound_declarators(compound_declaration, &specifiers);
4607 rem_anchor_token('}');
4609 if(token.type == T_EOF) {
4610 errorf(HERE, "EOF while parsing struct");
4615 static type_t *parse_typename(void)
4617 declaration_specifiers_t specifiers;
4618 memset(&specifiers, 0, sizeof(specifiers));
4619 parse_declaration_specifiers(&specifiers);
4620 if(specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4621 /* TODO: improve error message, user does probably not know what a
4622 * storage class is...
4624 errorf(HERE, "typename may not have a storage class");
4627 type_t *result = parse_abstract_declarator(specifiers.type);
4635 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4636 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4637 expression_t *left);
4639 typedef struct expression_parser_function_t expression_parser_function_t;
4640 struct expression_parser_function_t {
4641 unsigned precedence;
4642 parse_expression_function parser;
4643 unsigned infix_precedence;
4644 parse_expression_infix_function infix_parser;
4647 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4650 * Prints an error message if an expression was expected but not read
4652 static expression_t *expected_expression_error(void)
4654 /* skip the error message if the error token was read */
4655 if (token.type != T_ERROR) {
4656 errorf(HERE, "expected expression, got token '%K'", &token);
4660 return create_invalid_expression();
4664 * Parse a string constant.
4666 static expression_t *parse_string_const(void)
4669 if (token.type == T_STRING_LITERAL) {
4670 string_t res = token.v.string;
4672 while (token.type == T_STRING_LITERAL) {
4673 res = concat_strings(&res, &token.v.string);
4676 if (token.type != T_WIDE_STRING_LITERAL) {
4677 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4678 /* note: that we use type_char_ptr here, which is already the
4679 * automatic converted type. revert_automatic_type_conversion
4680 * will construct the array type */
4681 cnst->base.type = type_char_ptr;
4682 cnst->string.value = res;
4686 wres = concat_string_wide_string(&res, &token.v.wide_string);
4688 wres = token.v.wide_string;
4693 switch (token.type) {
4694 case T_WIDE_STRING_LITERAL:
4695 wres = concat_wide_strings(&wres, &token.v.wide_string);
4698 case T_STRING_LITERAL:
4699 wres = concat_wide_string_string(&wres, &token.v.string);
4703 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
4704 cnst->base.type = type_wchar_t_ptr;
4705 cnst->wide_string.value = wres;
4714 * Parse an integer constant.
4716 static expression_t *parse_int_const(void)
4718 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4719 cnst->base.source_position = *HERE;
4720 cnst->base.type = token.datatype;
4721 cnst->conste.v.int_value = token.v.intvalue;
4729 * Parse a character constant.
4731 static expression_t *parse_character_constant(void)
4733 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
4735 cnst->base.source_position = *HERE;
4736 cnst->base.type = token.datatype;
4737 cnst->conste.v.character = token.v.string;
4739 if (cnst->conste.v.character.size != 1) {
4740 if (warning.multichar && (c_mode & _GNUC)) {
4742 warningf(HERE, "multi-character character constant");
4744 errorf(HERE, "more than 1 characters in character constant");
4753 * Parse a wide character constant.
4755 static expression_t *parse_wide_character_constant(void)
4757 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
4759 cnst->base.source_position = *HERE;
4760 cnst->base.type = token.datatype;
4761 cnst->conste.v.wide_character = token.v.wide_string;
4763 if (cnst->conste.v.wide_character.size != 1) {
4764 if (warning.multichar && (c_mode & _GNUC)) {
4766 warningf(HERE, "multi-character character constant");
4768 errorf(HERE, "more than 1 characters in character constant");
4777 * Parse a float constant.
4779 static expression_t *parse_float_const(void)
4781 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4782 cnst->base.type = token.datatype;
4783 cnst->conste.v.float_value = token.v.floatvalue;
4790 static declaration_t *create_implicit_function(symbol_t *symbol,
4791 const source_position_t *source_position)
4793 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
4794 ntype->function.return_type = type_int;
4795 ntype->function.unspecified_parameters = true;
4797 type_t *type = typehash_insert(ntype);
4802 declaration_t *const declaration = allocate_declaration_zero();
4803 declaration->storage_class = STORAGE_CLASS_EXTERN;
4804 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
4805 declaration->type = type;
4806 declaration->symbol = symbol;
4807 declaration->source_position = *source_position;
4809 bool strict_prototypes_old = warning.strict_prototypes;
4810 warning.strict_prototypes = false;
4811 record_declaration(declaration);
4812 warning.strict_prototypes = strict_prototypes_old;
4818 * Creates a return_type (func)(argument_type) function type if not
4821 * @param return_type the return type
4822 * @param argument_type the argument type
4824 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
4826 function_parameter_t *parameter
4827 = obstack_alloc(type_obst, sizeof(parameter[0]));
4828 memset(parameter, 0, sizeof(parameter[0]));
4829 parameter->type = argument_type;
4831 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4832 type->function.return_type = return_type;
4833 type->function.parameters = parameter;
4835 type_t *result = typehash_insert(type);
4836 if(result != type) {
4843 static type_t *make_function_0_type(type_t *return_type)
4845 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4846 type->function.return_type = return_type;
4847 type->function.parameters = NULL;
4849 type_t *result = typehash_insert(type);
4850 if(result != type) {
4858 * Creates a function type for some function like builtins.
4860 * @param symbol the symbol describing the builtin
4862 static type_t *get_builtin_symbol_type(symbol_t *symbol)
4864 switch(symbol->ID) {
4865 case T___builtin_alloca:
4866 return make_function_1_type(type_void_ptr, type_size_t);
4867 case T___builtin_huge_val:
4868 return make_function_0_type(type_double);
4869 case T___builtin_nan:
4870 return make_function_1_type(type_double, type_char_ptr);
4871 case T___builtin_nanf:
4872 return make_function_1_type(type_float, type_char_ptr);
4873 case T___builtin_nand:
4874 return make_function_1_type(type_long_double, type_char_ptr);
4875 case T___builtin_va_end:
4876 return make_function_1_type(type_void, type_valist);
4878 internal_errorf(HERE, "not implemented builtin symbol found");
4883 * Performs automatic type cast as described in § 6.3.2.1.
4885 * @param orig_type the original type
4887 static type_t *automatic_type_conversion(type_t *orig_type)
4889 type_t *type = skip_typeref(orig_type);
4890 if(is_type_array(type)) {
4891 array_type_t *array_type = &type->array;
4892 type_t *element_type = array_type->element_type;
4893 unsigned qualifiers = array_type->base.qualifiers;
4895 return make_pointer_type(element_type, qualifiers);
4898 if(is_type_function(type)) {
4899 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4906 * reverts the automatic casts of array to pointer types and function
4907 * to function-pointer types as defined § 6.3.2.1
4909 type_t *revert_automatic_type_conversion(const expression_t *expression)
4911 switch (expression->kind) {
4912 case EXPR_REFERENCE: return expression->reference.declaration->type;
4913 case EXPR_SELECT: return expression->select.compound_entry->type;
4915 case EXPR_UNARY_DEREFERENCE: {
4916 const expression_t *const value = expression->unary.value;
4917 type_t *const type = skip_typeref(value->base.type);
4918 assert(is_type_pointer(type));
4919 return type->pointer.points_to;
4922 case EXPR_BUILTIN_SYMBOL:
4923 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
4925 case EXPR_ARRAY_ACCESS: {
4926 const expression_t *array_ref = expression->array_access.array_ref;
4927 type_t *type_left = skip_typeref(array_ref->base.type);
4928 if (!is_type_valid(type_left))
4930 assert(is_type_pointer(type_left));
4931 return type_left->pointer.points_to;
4934 case EXPR_STRING_LITERAL: {
4935 size_t size = expression->string.value.size;
4936 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
4939 case EXPR_WIDE_STRING_LITERAL: {
4940 size_t size = expression->wide_string.value.size;
4941 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
4944 case EXPR_COMPOUND_LITERAL:
4945 return expression->compound_literal.type;
4950 return expression->base.type;
4953 static expression_t *parse_reference(void)
4955 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
4957 reference_expression_t *ref = &expression->reference;
4958 symbol_t *const symbol = token.v.symbol;
4960 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
4962 source_position_t source_position = token.source_position;
4965 if(declaration == NULL) {
4966 if (! strict_mode && token.type == '(') {
4967 /* an implicitly defined function */
4968 if (warning.implicit_function_declaration) {
4969 warningf(HERE, "implicit declaration of function '%Y'",
4973 declaration = create_implicit_function(symbol,
4976 errorf(HERE, "unknown symbol '%Y' found.", symbol);
4977 return create_invalid_expression();
4981 type_t *type = declaration->type;
4983 /* we always do the auto-type conversions; the & and sizeof parser contains
4984 * code to revert this! */
4985 type = automatic_type_conversion(type);
4987 ref->declaration = declaration;
4988 ref->base.type = type;
4990 /* this declaration is used */
4991 declaration->used = true;
4993 /* check for deprecated functions */
4994 if(declaration->deprecated != 0) {
4995 const char *prefix = "";
4996 if (is_type_function(declaration->type))
4997 prefix = "function ";
4999 if (declaration->deprecated_string != NULL) {
5000 warningf(&source_position,
5001 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
5002 declaration->deprecated_string);
5004 warningf(&source_position,
5005 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
5012 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5016 /* TODO check if explicit cast is allowed and issue warnings/errors */
5019 static expression_t *parse_compound_literal(type_t *type)
5021 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5023 parse_initializer_env_t env;
5025 env.declaration = NULL;
5026 env.must_be_constant = false;
5027 initializer_t *initializer = parse_initializer(&env);
5030 expression->compound_literal.initializer = initializer;
5031 expression->compound_literal.type = type;
5032 expression->base.type = automatic_type_conversion(type);
5038 * Parse a cast expression.
5040 static expression_t *parse_cast(void)
5042 source_position_t source_position = token.source_position;
5044 type_t *type = parse_typename();
5046 /* matching add_anchor_token() is at call site */
5047 rem_anchor_token(')');
5050 if(token.type == '{') {
5051 return parse_compound_literal(type);
5054 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5055 cast->base.source_position = source_position;
5057 expression_t *value = parse_sub_expression(20);
5059 check_cast_allowed(value, type);
5061 cast->base.type = type;
5062 cast->unary.value = value;
5066 return create_invalid_expression();
5070 * Parse a statement expression.
5072 static expression_t *parse_statement_expression(void)
5074 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5076 statement_t *statement = parse_compound_statement(true);
5077 expression->statement.statement = statement;
5078 expression->base.source_position = statement->base.source_position;
5080 /* find last statement and use its type */
5081 type_t *type = type_void;
5082 const statement_t *stmt = statement->compound.statements;
5084 while (stmt->base.next != NULL)
5085 stmt = stmt->base.next;
5087 if (stmt->kind == STATEMENT_EXPRESSION) {
5088 type = stmt->expression.expression->base.type;
5091 warningf(&expression->base.source_position, "empty statement expression ({})");
5093 expression->base.type = type;
5099 return create_invalid_expression();
5103 * Parse a braced expression.
5105 static expression_t *parse_brace_expression(void)
5108 add_anchor_token(')');
5110 switch(token.type) {
5112 /* gcc extension: a statement expression */
5113 return parse_statement_expression();
5117 return parse_cast();
5119 if(is_typedef_symbol(token.v.symbol)) {
5120 return parse_cast();
5124 expression_t *result = parse_expression();
5125 rem_anchor_token(')');
5130 return create_invalid_expression();
5133 static expression_t *parse_function_keyword(void)
5138 if (current_function == NULL) {
5139 errorf(HERE, "'__func__' used outside of a function");
5142 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5143 expression->base.type = type_char_ptr;
5144 expression->funcname.kind = FUNCNAME_FUNCTION;
5149 static expression_t *parse_pretty_function_keyword(void)
5151 eat(T___PRETTY_FUNCTION__);
5153 if (current_function == NULL) {
5154 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5157 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5158 expression->base.type = type_char_ptr;
5159 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5164 static expression_t *parse_funcsig_keyword(void)
5168 if (current_function == NULL) {
5169 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5172 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5173 expression->base.type = type_char_ptr;
5174 expression->funcname.kind = FUNCNAME_FUNCSIG;
5179 static expression_t *parse_funcdname_keyword(void)
5181 eat(T___FUNCDNAME__);
5183 if (current_function == NULL) {
5184 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5187 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5188 expression->base.type = type_char_ptr;
5189 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5194 static designator_t *parse_designator(void)
5196 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5197 result->source_position = *HERE;
5199 if(token.type != T_IDENTIFIER) {
5200 parse_error_expected("while parsing member designator",
5201 T_IDENTIFIER, NULL);
5204 result->symbol = token.v.symbol;
5207 designator_t *last_designator = result;
5209 if(token.type == '.') {
5211 if(token.type != T_IDENTIFIER) {
5212 parse_error_expected("while parsing member designator",
5213 T_IDENTIFIER, NULL);
5216 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5217 designator->source_position = *HERE;
5218 designator->symbol = token.v.symbol;
5221 last_designator->next = designator;
5222 last_designator = designator;
5225 if(token.type == '[') {
5227 add_anchor_token(']');
5228 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5229 designator->source_position = *HERE;
5230 designator->array_index = parse_expression();
5231 rem_anchor_token(']');
5233 if(designator->array_index == NULL) {
5237 last_designator->next = designator;
5238 last_designator = designator;
5250 * Parse the __builtin_offsetof() expression.
5252 static expression_t *parse_offsetof(void)
5254 eat(T___builtin_offsetof);
5256 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5257 expression->base.type = type_size_t;
5260 add_anchor_token(',');
5261 type_t *type = parse_typename();
5262 rem_anchor_token(',');
5264 add_anchor_token(')');
5265 designator_t *designator = parse_designator();
5266 rem_anchor_token(')');
5269 expression->offsetofe.type = type;
5270 expression->offsetofe.designator = designator;
5273 memset(&path, 0, sizeof(path));
5274 path.top_type = type;
5275 path.path = NEW_ARR_F(type_path_entry_t, 0);
5277 descend_into_subtype(&path);
5279 if(!walk_designator(&path, designator, true)) {
5280 return create_invalid_expression();
5283 DEL_ARR_F(path.path);
5287 return create_invalid_expression();
5291 * Parses a _builtin_va_start() expression.
5293 static expression_t *parse_va_start(void)
5295 eat(T___builtin_va_start);
5297 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5300 add_anchor_token(',');
5301 expression->va_starte.ap = parse_assignment_expression();
5302 rem_anchor_token(',');
5304 expression_t *const expr = parse_assignment_expression();
5305 if (expr->kind == EXPR_REFERENCE) {
5306 declaration_t *const decl = expr->reference.declaration;
5308 return create_invalid_expression();
5309 if (decl->parent_scope == ¤t_function->scope &&
5310 decl->next == NULL) {
5311 expression->va_starte.parameter = decl;
5316 errorf(&expr->base.source_position,
5317 "second argument of 'va_start' must be last parameter of the current function");
5319 return create_invalid_expression();
5323 * Parses a _builtin_va_arg() expression.
5325 static expression_t *parse_va_arg(void)
5327 eat(T___builtin_va_arg);
5329 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5332 expression->va_arge.ap = parse_assignment_expression();
5334 expression->base.type = parse_typename();
5339 return create_invalid_expression();
5342 static expression_t *parse_builtin_symbol(void)
5344 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5346 symbol_t *symbol = token.v.symbol;
5348 expression->builtin_symbol.symbol = symbol;
5351 type_t *type = get_builtin_symbol_type(symbol);
5352 type = automatic_type_conversion(type);
5354 expression->base.type = type;
5359 * Parses a __builtin_constant() expression.
5361 static expression_t *parse_builtin_constant(void)
5363 eat(T___builtin_constant_p);
5365 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5368 add_anchor_token(')');
5369 expression->builtin_constant.value = parse_assignment_expression();
5370 rem_anchor_token(')');
5372 expression->base.type = type_int;
5376 return create_invalid_expression();
5380 * Parses a __builtin_prefetch() expression.
5382 static expression_t *parse_builtin_prefetch(void)
5384 eat(T___builtin_prefetch);
5386 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5389 add_anchor_token(')');
5390 expression->builtin_prefetch.adr = parse_assignment_expression();
5391 if (token.type == ',') {
5393 expression->builtin_prefetch.rw = parse_assignment_expression();
5395 if (token.type == ',') {
5397 expression->builtin_prefetch.locality = parse_assignment_expression();
5399 rem_anchor_token(')');
5401 expression->base.type = type_void;
5405 return create_invalid_expression();
5409 * Parses a __builtin_is_*() compare expression.
5411 static expression_t *parse_compare_builtin(void)
5413 expression_t *expression;
5415 switch(token.type) {
5416 case T___builtin_isgreater:
5417 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5419 case T___builtin_isgreaterequal:
5420 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5422 case T___builtin_isless:
5423 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5425 case T___builtin_islessequal:
5426 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5428 case T___builtin_islessgreater:
5429 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5431 case T___builtin_isunordered:
5432 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5435 internal_errorf(HERE, "invalid compare builtin found");
5438 expression->base.source_position = *HERE;
5442 expression->binary.left = parse_assignment_expression();
5444 expression->binary.right = parse_assignment_expression();
5447 type_t *const orig_type_left = expression->binary.left->base.type;
5448 type_t *const orig_type_right = expression->binary.right->base.type;
5450 type_t *const type_left = skip_typeref(orig_type_left);
5451 type_t *const type_right = skip_typeref(orig_type_right);
5452 if(!is_type_float(type_left) && !is_type_float(type_right)) {
5453 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5454 type_error_incompatible("invalid operands in comparison",
5455 &expression->base.source_position, orig_type_left, orig_type_right);
5458 semantic_comparison(&expression->binary);
5463 return create_invalid_expression();
5467 * Parses a __builtin_expect() expression.
5469 static expression_t *parse_builtin_expect(void)
5471 eat(T___builtin_expect);
5473 expression_t *expression
5474 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5477 expression->binary.left = parse_assignment_expression();
5479 expression->binary.right = parse_constant_expression();
5482 expression->base.type = expression->binary.left->base.type;
5486 return create_invalid_expression();
5490 * Parses a MS assume() expression.
5492 static expression_t *parse_assume(void) {
5495 expression_t *expression
5496 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5499 add_anchor_token(')');
5500 expression->unary.value = parse_assignment_expression();
5501 rem_anchor_token(')');
5504 expression->base.type = type_void;
5507 return create_invalid_expression();
5511 * Parse a microsoft __noop expression.
5513 static expression_t *parse_noop_expression(void) {
5514 source_position_t source_position = *HERE;
5517 if (token.type == '(') {
5518 /* parse arguments */
5520 add_anchor_token(')');
5521 add_anchor_token(',');
5523 if(token.type != ')') {
5525 (void)parse_assignment_expression();
5526 if(token.type != ',')
5532 rem_anchor_token(',');
5533 rem_anchor_token(')');
5536 /* the result is a (int)0 */
5537 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5538 cnst->base.source_position = source_position;
5539 cnst->base.type = type_int;
5540 cnst->conste.v.int_value = 0;
5541 cnst->conste.is_ms_noop = true;
5546 return create_invalid_expression();
5550 * Parses a primary expression.
5552 static expression_t *parse_primary_expression(void)
5554 switch (token.type) {
5555 case T_INTEGER: return parse_int_const();
5556 case T_CHARACTER_CONSTANT: return parse_character_constant();
5557 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5558 case T_FLOATINGPOINT: return parse_float_const();
5559 case T_STRING_LITERAL:
5560 case T_WIDE_STRING_LITERAL: return parse_string_const();
5561 case T_IDENTIFIER: return parse_reference();
5562 case T___FUNCTION__:
5563 case T___func__: return parse_function_keyword();
5564 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5565 case T___FUNCSIG__: return parse_funcsig_keyword();
5566 case T___FUNCDNAME__: return parse_funcdname_keyword();
5567 case T___builtin_offsetof: return parse_offsetof();
5568 case T___builtin_va_start: return parse_va_start();
5569 case T___builtin_va_arg: return parse_va_arg();
5570 case T___builtin_expect: return parse_builtin_expect();
5571 case T___builtin_alloca:
5572 case T___builtin_nan:
5573 case T___builtin_nand:
5574 case T___builtin_nanf:
5575 case T___builtin_huge_val:
5576 case T___builtin_va_end: return parse_builtin_symbol();
5577 case T___builtin_isgreater:
5578 case T___builtin_isgreaterequal:
5579 case T___builtin_isless:
5580 case T___builtin_islessequal:
5581 case T___builtin_islessgreater:
5582 case T___builtin_isunordered: return parse_compare_builtin();
5583 case T___builtin_constant_p: return parse_builtin_constant();
5584 case T___builtin_prefetch: return parse_builtin_prefetch();
5585 case T__assume: return parse_assume();
5587 case '(': return parse_brace_expression();
5588 case T___noop: return parse_noop_expression();
5591 errorf(HERE, "unexpected token %K, expected an expression", &token);
5592 return create_invalid_expression();
5596 * Check if the expression has the character type and issue a warning then.
5598 static void check_for_char_index_type(const expression_t *expression) {
5599 type_t *const type = expression->base.type;
5600 const type_t *const base_type = skip_typeref(type);
5602 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5603 warning.char_subscripts) {
5604 warningf(&expression->base.source_position,
5605 "array subscript has type '%T'", type);
5609 static expression_t *parse_array_expression(unsigned precedence,
5615 add_anchor_token(']');
5617 expression_t *inside = parse_expression();
5619 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5621 array_access_expression_t *array_access = &expression->array_access;
5623 type_t *const orig_type_left = left->base.type;
5624 type_t *const orig_type_inside = inside->base.type;
5626 type_t *const type_left = skip_typeref(orig_type_left);
5627 type_t *const type_inside = skip_typeref(orig_type_inside);
5629 type_t *return_type;
5630 if (is_type_pointer(type_left)) {
5631 return_type = type_left->pointer.points_to;
5632 array_access->array_ref = left;
5633 array_access->index = inside;
5634 check_for_char_index_type(inside);
5635 } else if (is_type_pointer(type_inside)) {
5636 return_type = type_inside->pointer.points_to;
5637 array_access->array_ref = inside;
5638 array_access->index = left;
5639 array_access->flipped = true;
5640 check_for_char_index_type(left);
5642 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5644 "array access on object with non-pointer types '%T', '%T'",
5645 orig_type_left, orig_type_inside);
5647 return_type = type_error_type;
5648 array_access->array_ref = create_invalid_expression();
5651 rem_anchor_token(']');
5652 if(token.type != ']') {
5653 parse_error_expected("Problem while parsing array access", ']', NULL);
5658 return_type = automatic_type_conversion(return_type);
5659 expression->base.type = return_type;
5664 static expression_t *parse_typeprop(expression_kind_t const kind,
5665 source_position_t const pos,
5666 unsigned const precedence)
5668 expression_t *tp_expression = allocate_expression_zero(kind);
5669 tp_expression->base.type = type_size_t;
5670 tp_expression->base.source_position = pos;
5672 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
5674 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
5676 add_anchor_token(')');
5677 type_t* const orig_type = parse_typename();
5678 tp_expression->typeprop.type = orig_type;
5680 type_t const* const type = skip_typeref(orig_type);
5681 char const* const wrong_type =
5682 is_type_incomplete(type) ? "incomplete" :
5683 type->kind == TYPE_FUNCTION ? "function designator" :
5684 type->kind == TYPE_BITFIELD ? "bitfield" :
5686 if (wrong_type != NULL) {
5687 errorf(&pos, "operand of %s expression must not be %s type '%T'",
5688 what, wrong_type, type);
5691 rem_anchor_token(')');
5694 expression_t *expression = parse_sub_expression(precedence);
5696 type_t* const orig_type = revert_automatic_type_conversion(expression);
5697 expression->base.type = orig_type;
5699 type_t const* const type = skip_typeref(orig_type);
5700 char const* const wrong_type =
5701 is_type_incomplete(type) ? "incomplete" :
5702 type->kind == TYPE_FUNCTION ? "function designator" :
5703 type->kind == TYPE_BITFIELD ? "bitfield" :
5705 if (wrong_type != NULL) {
5706 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
5709 tp_expression->typeprop.type = expression->base.type;
5710 tp_expression->typeprop.tp_expression = expression;
5713 return tp_expression;
5715 return create_invalid_expression();
5718 static expression_t *parse_sizeof(unsigned precedence)
5720 source_position_t pos = *HERE;
5722 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
5725 static expression_t *parse_alignof(unsigned precedence)
5727 source_position_t pos = *HERE;
5729 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
5732 static expression_t *parse_select_expression(unsigned precedence,
5733 expression_t *compound)
5736 assert(token.type == '.' || token.type == T_MINUSGREATER);
5738 bool is_pointer = (token.type == T_MINUSGREATER);
5741 expression_t *select = allocate_expression_zero(EXPR_SELECT);
5742 select->select.compound = compound;
5744 if (token.type != T_IDENTIFIER) {
5745 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
5748 symbol_t *symbol = token.v.symbol;
5749 select->select.symbol = symbol;
5752 type_t *const orig_type = compound->base.type;
5753 type_t *const type = skip_typeref(orig_type);
5755 type_t *type_left = type;
5757 if (!is_type_pointer(type)) {
5758 if (is_type_valid(type)) {
5759 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
5761 return create_invalid_expression();
5763 type_left = type->pointer.points_to;
5765 type_left = skip_typeref(type_left);
5767 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
5768 type_left->kind != TYPE_COMPOUND_UNION) {
5769 if (is_type_valid(type_left)) {
5770 errorf(HERE, "request for member '%Y' in something not a struct or "
5771 "union, but '%T'", symbol, type_left);
5773 return create_invalid_expression();
5776 declaration_t *const declaration = type_left->compound.declaration;
5778 if (!declaration->init.complete) {
5779 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
5781 return create_invalid_expression();
5784 declaration_t *iter = find_compound_entry(declaration, symbol);
5786 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
5787 return create_invalid_expression();
5790 /* we always do the auto-type conversions; the & and sizeof parser contains
5791 * code to revert this! */
5792 type_t *expression_type = automatic_type_conversion(iter->type);
5794 select->select.compound_entry = iter;
5795 select->base.type = expression_type;
5797 type_t *skipped = skip_typeref(iter->type);
5798 if (skipped->kind == TYPE_BITFIELD) {
5799 select->base.type = skipped->bitfield.base_type;
5806 * Parse a call expression, ie. expression '( ... )'.
5808 * @param expression the function address
5810 static expression_t *parse_call_expression(unsigned precedence,
5811 expression_t *expression)
5814 expression_t *result = allocate_expression_zero(EXPR_CALL);
5815 result->base.source_position = expression->base.source_position;
5817 call_expression_t *call = &result->call;
5818 call->function = expression;
5820 type_t *const orig_type = expression->base.type;
5821 type_t *const type = skip_typeref(orig_type);
5823 function_type_t *function_type = NULL;
5824 if (is_type_pointer(type)) {
5825 type_t *const to_type = skip_typeref(type->pointer.points_to);
5827 if (is_type_function(to_type)) {
5828 function_type = &to_type->function;
5829 call->base.type = function_type->return_type;
5833 if (function_type == NULL && is_type_valid(type)) {
5834 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
5837 /* parse arguments */
5839 add_anchor_token(')');
5840 add_anchor_token(',');
5842 if(token.type != ')') {
5843 call_argument_t *last_argument = NULL;
5846 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
5848 argument->expression = parse_assignment_expression();
5849 if(last_argument == NULL) {
5850 call->arguments = argument;
5852 last_argument->next = argument;
5854 last_argument = argument;
5856 if(token.type != ',')
5861 rem_anchor_token(',');
5862 rem_anchor_token(')');
5865 if(function_type == NULL)
5868 function_parameter_t *parameter = function_type->parameters;
5869 call_argument_t *argument = call->arguments;
5870 if (!function_type->unspecified_parameters) {
5871 for( ; parameter != NULL && argument != NULL;
5872 parameter = parameter->next, argument = argument->next) {
5873 type_t *expected_type = parameter->type;
5874 /* TODO report scope in error messages */
5875 expression_t *const arg_expr = argument->expression;
5876 type_t *const res_type = semantic_assign(expected_type, arg_expr,
5878 &arg_expr->base.source_position);
5879 if (res_type == NULL) {
5880 /* TODO improve error message */
5881 errorf(&arg_expr->base.source_position,
5882 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
5883 arg_expr, arg_expr->base.type, expected_type);
5885 argument->expression = create_implicit_cast(argument->expression, expected_type);
5889 if (parameter != NULL) {
5890 errorf(HERE, "too few arguments to function '%E'", expression);
5891 } else if (argument != NULL && !function_type->variadic) {
5892 errorf(HERE, "too many arguments to function '%E'", expression);
5896 /* do default promotion */
5897 for( ; argument != NULL; argument = argument->next) {
5898 type_t *type = argument->expression->base.type;
5900 type = get_default_promoted_type(type);
5902 argument->expression
5903 = create_implicit_cast(argument->expression, type);
5906 check_format(&result->call);
5910 return create_invalid_expression();
5913 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
5915 static bool same_compound_type(const type_t *type1, const type_t *type2)
5918 is_type_compound(type1) &&
5919 type1->kind == type2->kind &&
5920 type1->compound.declaration == type2->compound.declaration;
5924 * Parse a conditional expression, ie. 'expression ? ... : ...'.
5926 * @param expression the conditional expression
5928 static expression_t *parse_conditional_expression(unsigned precedence,
5929 expression_t *expression)
5932 add_anchor_token(':');
5934 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
5936 conditional_expression_t *conditional = &result->conditional;
5937 conditional->condition = expression;
5940 type_t *const condition_type_orig = expression->base.type;
5941 type_t *const condition_type = skip_typeref(condition_type_orig);
5942 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
5943 type_error("expected a scalar type in conditional condition",
5944 &expression->base.source_position, condition_type_orig);
5947 expression_t *true_expression = parse_expression();
5948 rem_anchor_token(':');
5950 expression_t *false_expression = parse_sub_expression(precedence);
5952 type_t *const orig_true_type = true_expression->base.type;
5953 type_t *const orig_false_type = false_expression->base.type;
5954 type_t *const true_type = skip_typeref(orig_true_type);
5955 type_t *const false_type = skip_typeref(orig_false_type);
5958 type_t *result_type;
5959 if(is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
5960 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5961 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
5962 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5963 warningf(&expression->base.source_position,
5964 "ISO C forbids conditional expression with only one void side");
5966 result_type = type_void;
5967 } else if (is_type_arithmetic(true_type)
5968 && is_type_arithmetic(false_type)) {
5969 result_type = semantic_arithmetic(true_type, false_type);
5971 true_expression = create_implicit_cast(true_expression, result_type);
5972 false_expression = create_implicit_cast(false_expression, result_type);
5974 conditional->true_expression = true_expression;
5975 conditional->false_expression = false_expression;
5976 conditional->base.type = result_type;
5977 } else if (same_compound_type(true_type, false_type)) {
5978 /* just take 1 of the 2 types */
5979 result_type = true_type;
5980 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
5981 type_t *pointer_type;
5983 expression_t *other_expression;
5984 if (is_type_pointer(true_type)) {
5985 pointer_type = true_type;
5986 other_type = false_type;
5987 other_expression = false_expression;
5989 pointer_type = false_type;
5990 other_type = true_type;
5991 other_expression = true_expression;
5994 if(is_type_pointer(other_type)) {
5995 if(!pointers_compatible(true_type, false_type)) {
5996 warningf(&expression->base.source_position,
5997 "pointer types '%T' and '%T' in conditional expression are incompatible", true_type, false_type);
5999 result_type = true_type;
6000 } else if(is_null_pointer_constant(other_expression)) {
6001 result_type = pointer_type;
6002 } else if(is_type_integer(other_type)) {
6003 warningf(&expression->base.source_position,
6004 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
6005 result_type = pointer_type;
6007 type_error_incompatible("while parsing conditional",
6008 &expression->base.source_position, true_type, false_type);
6009 result_type = type_error_type;
6012 /* TODO: one pointer to void*, other some pointer */
6014 if (is_type_valid(true_type) && is_type_valid(false_type)) {
6015 type_error_incompatible("while parsing conditional",
6016 &expression->base.source_position, true_type,
6019 result_type = type_error_type;
6022 conditional->true_expression
6023 = create_implicit_cast(true_expression, result_type);
6024 conditional->false_expression
6025 = create_implicit_cast(false_expression, result_type);
6026 conditional->base.type = result_type;
6029 return create_invalid_expression();
6033 * Parse an extension expression.
6035 static expression_t *parse_extension(unsigned precedence)
6037 eat(T___extension__);
6039 /* TODO enable extensions */
6040 expression_t *expression = parse_sub_expression(precedence);
6041 /* TODO disable extensions */
6046 * Parse a __builtin_classify_type() expression.
6048 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6050 eat(T___builtin_classify_type);
6052 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6053 result->base.type = type_int;
6056 add_anchor_token(')');
6057 expression_t *expression = parse_sub_expression(precedence);
6058 rem_anchor_token(')');
6060 result->classify_type.type_expression = expression;
6064 return create_invalid_expression();
6067 static void semantic_incdec(unary_expression_t *expression)
6069 type_t *const orig_type = expression->value->base.type;
6070 type_t *const type = skip_typeref(orig_type);
6071 /* TODO !is_type_real && !is_type_pointer */
6072 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
6073 if (is_type_valid(type)) {
6074 /* TODO: improve error message */
6075 errorf(HERE, "operation needs an arithmetic or pointer type");
6080 expression->base.type = orig_type;
6083 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6085 type_t *const orig_type = expression->value->base.type;
6086 type_t *const type = skip_typeref(orig_type);
6087 if(!is_type_arithmetic(type)) {
6088 if (is_type_valid(type)) {
6089 /* TODO: improve error message */
6090 errorf(HERE, "operation needs an arithmetic type");
6095 expression->base.type = orig_type;
6098 static void semantic_unexpr_scalar(unary_expression_t *expression)
6100 type_t *const orig_type = expression->value->base.type;
6101 type_t *const type = skip_typeref(orig_type);
6102 if (!is_type_scalar(type)) {
6103 if (is_type_valid(type)) {
6104 errorf(HERE, "operand of ! must be of scalar type");
6109 expression->base.type = orig_type;
6112 static void semantic_unexpr_integer(unary_expression_t *expression)
6114 type_t *const orig_type = expression->value->base.type;
6115 type_t *const type = skip_typeref(orig_type);
6116 if (!is_type_integer(type)) {
6117 if (is_type_valid(type)) {
6118 errorf(HERE, "operand of ~ must be of integer type");
6123 expression->base.type = orig_type;
6126 static void semantic_dereference(unary_expression_t *expression)
6128 type_t *const orig_type = expression->value->base.type;
6129 type_t *const type = skip_typeref(orig_type);
6130 if(!is_type_pointer(type)) {
6131 if (is_type_valid(type)) {
6132 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6137 type_t *result_type = type->pointer.points_to;
6138 result_type = automatic_type_conversion(result_type);
6139 expression->base.type = result_type;
6143 * Check the semantic of the address taken expression.
6145 static void semantic_take_addr(unary_expression_t *expression)
6147 expression_t *value = expression->value;
6148 value->base.type = revert_automatic_type_conversion(value);
6150 type_t *orig_type = value->base.type;
6151 if(!is_type_valid(orig_type))
6154 if(value->kind == EXPR_REFERENCE) {
6155 declaration_t *const declaration = value->reference.declaration;
6156 if(declaration != NULL) {
6157 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
6158 errorf(&expression->base.source_position,
6159 "address of register variable '%Y' requested",
6160 declaration->symbol);
6162 declaration->address_taken = 1;
6166 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6169 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6170 static expression_t *parse_##unexpression_type(unsigned precedence) \
6174 expression_t *unary_expression \
6175 = allocate_expression_zero(unexpression_type); \
6176 unary_expression->base.source_position = *HERE; \
6177 unary_expression->unary.value = parse_sub_expression(precedence); \
6179 sfunc(&unary_expression->unary); \
6181 return unary_expression; \
6184 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6185 semantic_unexpr_arithmetic)
6186 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6187 semantic_unexpr_arithmetic)
6188 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6189 semantic_unexpr_scalar)
6190 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6191 semantic_dereference)
6192 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6194 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6195 semantic_unexpr_integer)
6196 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6198 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6201 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6203 static expression_t *parse_##unexpression_type(unsigned precedence, \
6204 expression_t *left) \
6206 (void) precedence; \
6209 expression_t *unary_expression \
6210 = allocate_expression_zero(unexpression_type); \
6211 unary_expression->unary.value = left; \
6213 sfunc(&unary_expression->unary); \
6215 return unary_expression; \
6218 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6219 EXPR_UNARY_POSTFIX_INCREMENT,
6221 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6222 EXPR_UNARY_POSTFIX_DECREMENT,
6225 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6227 /* TODO: handle complex + imaginary types */
6229 /* § 6.3.1.8 Usual arithmetic conversions */
6230 if(type_left == type_long_double || type_right == type_long_double) {
6231 return type_long_double;
6232 } else if(type_left == type_double || type_right == type_double) {
6234 } else if(type_left == type_float || type_right == type_float) {
6238 type_right = promote_integer(type_right);
6239 type_left = promote_integer(type_left);
6241 if(type_left == type_right)
6244 bool signed_left = is_type_signed(type_left);
6245 bool signed_right = is_type_signed(type_right);
6246 int rank_left = get_rank(type_left);
6247 int rank_right = get_rank(type_right);
6248 if(rank_left < rank_right) {
6249 if(signed_left == signed_right || !signed_right) {
6255 if(signed_left == signed_right || !signed_left) {
6264 * Check the semantic restrictions for a binary expression.
6266 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6268 expression_t *const left = expression->left;
6269 expression_t *const right = expression->right;
6270 type_t *const orig_type_left = left->base.type;
6271 type_t *const orig_type_right = right->base.type;
6272 type_t *const type_left = skip_typeref(orig_type_left);
6273 type_t *const type_right = skip_typeref(orig_type_right);
6275 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6276 /* TODO: improve error message */
6277 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6278 errorf(HERE, "operation needs arithmetic types");
6283 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6284 expression->left = create_implicit_cast(left, arithmetic_type);
6285 expression->right = create_implicit_cast(right, arithmetic_type);
6286 expression->base.type = arithmetic_type;
6289 static void semantic_shift_op(binary_expression_t *expression)
6291 expression_t *const left = expression->left;
6292 expression_t *const right = expression->right;
6293 type_t *const orig_type_left = left->base.type;
6294 type_t *const orig_type_right = right->base.type;
6295 type_t * type_left = skip_typeref(orig_type_left);
6296 type_t * type_right = skip_typeref(orig_type_right);
6298 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
6299 /* TODO: improve error message */
6300 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6301 errorf(HERE, "operation needs integer types");
6306 type_left = promote_integer(type_left);
6307 type_right = promote_integer(type_right);
6309 expression->left = create_implicit_cast(left, type_left);
6310 expression->right = create_implicit_cast(right, type_right);
6311 expression->base.type = type_left;
6314 static void semantic_add(binary_expression_t *expression)
6316 expression_t *const left = expression->left;
6317 expression_t *const right = expression->right;
6318 type_t *const orig_type_left = left->base.type;
6319 type_t *const orig_type_right = right->base.type;
6320 type_t *const type_left = skip_typeref(orig_type_left);
6321 type_t *const type_right = skip_typeref(orig_type_right);
6324 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6325 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6326 expression->left = create_implicit_cast(left, arithmetic_type);
6327 expression->right = create_implicit_cast(right, arithmetic_type);
6328 expression->base.type = arithmetic_type;
6330 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6331 expression->base.type = type_left;
6332 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
6333 expression->base.type = type_right;
6334 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6335 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
6339 static void semantic_sub(binary_expression_t *expression)
6341 expression_t *const left = expression->left;
6342 expression_t *const right = expression->right;
6343 type_t *const orig_type_left = left->base.type;
6344 type_t *const orig_type_right = right->base.type;
6345 type_t *const type_left = skip_typeref(orig_type_left);
6346 type_t *const type_right = skip_typeref(orig_type_right);
6349 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6350 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6351 expression->left = create_implicit_cast(left, arithmetic_type);
6352 expression->right = create_implicit_cast(right, arithmetic_type);
6353 expression->base.type = arithmetic_type;
6355 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6356 expression->base.type = type_left;
6357 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
6358 if(!pointers_compatible(type_left, type_right)) {
6360 "pointers to incompatible objects to binary '-' ('%T', '%T')",
6361 orig_type_left, orig_type_right);
6363 expression->base.type = type_ptrdiff_t;
6365 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6366 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')",
6367 orig_type_left, orig_type_right);
6372 * Check the semantics of comparison expressions.
6374 * @param expression The expression to check.
6376 static void semantic_comparison(binary_expression_t *expression)
6378 expression_t *left = expression->left;
6379 expression_t *right = expression->right;
6380 type_t *orig_type_left = left->base.type;
6381 type_t *orig_type_right = right->base.type;
6383 type_t *type_left = skip_typeref(orig_type_left);
6384 type_t *type_right = skip_typeref(orig_type_right);
6386 /* TODO non-arithmetic types */
6387 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6388 /* test for signed vs unsigned compares */
6389 if (warning.sign_compare &&
6390 (expression->base.kind != EXPR_BINARY_EQUAL &&
6391 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6392 (is_type_signed(type_left) != is_type_signed(type_right))) {
6394 /* check if 1 of the operands is a constant, in this case we just
6395 * check wether we can safely represent the resulting constant in
6396 * the type of the other operand. */
6397 expression_t *const_expr = NULL;
6398 expression_t *other_expr = NULL;
6400 if(is_constant_expression(left)) {
6403 } else if(is_constant_expression(right)) {
6408 if(const_expr != NULL) {
6409 type_t *other_type = skip_typeref(other_expr->base.type);
6410 long val = fold_constant(const_expr);
6411 /* TODO: check if val can be represented by other_type */
6415 warningf(&expression->base.source_position,
6416 "comparison between signed and unsigned");
6418 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6419 expression->left = create_implicit_cast(left, arithmetic_type);
6420 expression->right = create_implicit_cast(right, arithmetic_type);
6421 expression->base.type = arithmetic_type;
6422 if (warning.float_equal &&
6423 (expression->base.kind == EXPR_BINARY_EQUAL ||
6424 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6425 is_type_float(arithmetic_type)) {
6426 warningf(&expression->base.source_position,
6427 "comparing floating point with == or != is unsafe");
6429 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6430 /* TODO check compatibility */
6431 } else if (is_type_pointer(type_left)) {
6432 expression->right = create_implicit_cast(right, type_left);
6433 } else if (is_type_pointer(type_right)) {
6434 expression->left = create_implicit_cast(left, type_right);
6435 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6436 type_error_incompatible("invalid operands in comparison",
6437 &expression->base.source_position,
6438 type_left, type_right);
6440 expression->base.type = type_int;
6444 * Checks if a compound type has constant fields.
6446 static bool has_const_fields(const compound_type_t *type)
6448 const scope_t *scope = &type->declaration->scope;
6449 const declaration_t *declaration = scope->declarations;
6451 for (; declaration != NULL; declaration = declaration->next) {
6452 if (declaration->namespc != NAMESPACE_NORMAL)
6455 const type_t *decl_type = skip_typeref(declaration->type);
6456 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6463 static bool is_valid_assignment_lhs(expression_t const* const left)
6465 type_t *const orig_type_left = revert_automatic_type_conversion(left);
6466 type_t *const type_left = skip_typeref(orig_type_left);
6468 switch (left->kind) {
6469 case EXPR_REFERENCE:
6470 case EXPR_ARRAY_ACCESS:
6472 case EXPR_UNARY_DEREFERENCE:
6476 errorf(HERE, "left hand side '%E' of assignment is not an lvalue", left);
6480 if (is_type_array(type_left)) {
6481 errorf(HERE, "cannot assign to arrays ('%E')", left);
6484 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6485 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6489 if (is_type_incomplete(type_left)) {
6490 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
6491 left, orig_type_left);
6494 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6495 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6496 left, orig_type_left);
6503 static void semantic_arithmetic_assign(binary_expression_t *expression)
6505 expression_t *left = expression->left;
6506 expression_t *right = expression->right;
6507 type_t *orig_type_left = left->base.type;
6508 type_t *orig_type_right = right->base.type;
6510 if (!is_valid_assignment_lhs(left))
6513 type_t *type_left = skip_typeref(orig_type_left);
6514 type_t *type_right = skip_typeref(orig_type_right);
6516 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6517 /* TODO: improve error message */
6518 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6519 errorf(HERE, "operation needs arithmetic types");
6524 /* combined instructions are tricky. We can't create an implicit cast on
6525 * the left side, because we need the uncasted form for the store.
6526 * The ast2firm pass has to know that left_type must be right_type
6527 * for the arithmetic operation and create a cast by itself */
6528 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6529 expression->right = create_implicit_cast(right, arithmetic_type);
6530 expression->base.type = type_left;
6533 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
6535 expression_t *const left = expression->left;
6536 expression_t *const right = expression->right;
6537 type_t *const orig_type_left = left->base.type;
6538 type_t *const orig_type_right = right->base.type;
6539 type_t *const type_left = skip_typeref(orig_type_left);
6540 type_t *const type_right = skip_typeref(orig_type_right);
6542 if (!is_valid_assignment_lhs(left))
6545 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6546 /* combined instructions are tricky. We can't create an implicit cast on
6547 * the left side, because we need the uncasted form for the store.
6548 * The ast2firm pass has to know that left_type must be right_type
6549 * for the arithmetic operation and create a cast by itself */
6550 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
6551 expression->right = create_implicit_cast(right, arithmetic_type);
6552 expression->base.type = type_left;
6553 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6554 expression->base.type = type_left;
6555 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6556 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
6561 * Check the semantic restrictions of a logical expression.
6563 static void semantic_logical_op(binary_expression_t *expression)
6565 expression_t *const left = expression->left;
6566 expression_t *const right = expression->right;
6567 type_t *const orig_type_left = left->base.type;
6568 type_t *const orig_type_right = right->base.type;
6569 type_t *const type_left = skip_typeref(orig_type_left);
6570 type_t *const type_right = skip_typeref(orig_type_right);
6572 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
6573 /* TODO: improve error message */
6574 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6575 errorf(HERE, "operation needs scalar types");
6580 expression->base.type = type_int;
6584 * Check the semantic restrictions of a binary assign expression.
6586 static void semantic_binexpr_assign(binary_expression_t *expression)
6588 expression_t *left = expression->left;
6589 type_t *orig_type_left = left->base.type;
6591 type_t *type_left = revert_automatic_type_conversion(left);
6592 type_left = skip_typeref(orig_type_left);
6594 if (!is_valid_assignment_lhs(left))
6597 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
6598 "assignment", &left->base.source_position);
6599 if (res_type == NULL) {
6600 errorf(&expression->base.source_position,
6601 "cannot assign to '%T' from '%T'",
6602 orig_type_left, expression->right->base.type);
6604 expression->right = create_implicit_cast(expression->right, res_type);
6607 expression->base.type = orig_type_left;
6611 * Determine if the outermost operation (or parts thereof) of the given
6612 * expression has no effect in order to generate a warning about this fact.
6613 * Therefore in some cases this only examines some of the operands of the
6614 * expression (see comments in the function and examples below).
6616 * f() + 23; // warning, because + has no effect
6617 * x || f(); // no warning, because x controls execution of f()
6618 * x ? y : f(); // warning, because y has no effect
6619 * (void)x; // no warning to be able to suppress the warning
6620 * This function can NOT be used for an "expression has definitely no effect"-
6622 static bool expression_has_effect(const expression_t *const expr)
6624 switch (expr->kind) {
6625 case EXPR_UNKNOWN: break;
6626 case EXPR_INVALID: return true; /* do NOT warn */
6627 case EXPR_REFERENCE: return false;
6628 /* suppress the warning for microsoft __noop operations */
6629 case EXPR_CONST: return expr->conste.is_ms_noop;
6630 case EXPR_CHARACTER_CONSTANT: return false;
6631 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
6632 case EXPR_STRING_LITERAL: return false;
6633 case EXPR_WIDE_STRING_LITERAL: return false;
6636 const call_expression_t *const call = &expr->call;
6637 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
6640 switch (call->function->builtin_symbol.symbol->ID) {
6641 case T___builtin_va_end: return true;
6642 default: return false;
6646 /* Generate the warning if either the left or right hand side of a
6647 * conditional expression has no effect */
6648 case EXPR_CONDITIONAL: {
6649 const conditional_expression_t *const cond = &expr->conditional;
6651 expression_has_effect(cond->true_expression) &&
6652 expression_has_effect(cond->false_expression);
6655 case EXPR_SELECT: return false;
6656 case EXPR_ARRAY_ACCESS: return false;
6657 case EXPR_SIZEOF: return false;
6658 case EXPR_CLASSIFY_TYPE: return false;
6659 case EXPR_ALIGNOF: return false;
6661 case EXPR_FUNCNAME: return false;
6662 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
6663 case EXPR_BUILTIN_CONSTANT_P: return false;
6664 case EXPR_BUILTIN_PREFETCH: return true;
6665 case EXPR_OFFSETOF: return false;
6666 case EXPR_VA_START: return true;
6667 case EXPR_VA_ARG: return true;
6668 case EXPR_STATEMENT: return true; // TODO
6669 case EXPR_COMPOUND_LITERAL: return false;
6671 case EXPR_UNARY_NEGATE: return false;
6672 case EXPR_UNARY_PLUS: return false;
6673 case EXPR_UNARY_BITWISE_NEGATE: return false;
6674 case EXPR_UNARY_NOT: return false;
6675 case EXPR_UNARY_DEREFERENCE: return false;
6676 case EXPR_UNARY_TAKE_ADDRESS: return false;
6677 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
6678 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
6679 case EXPR_UNARY_PREFIX_INCREMENT: return true;
6680 case EXPR_UNARY_PREFIX_DECREMENT: return true;
6682 /* Treat void casts as if they have an effect in order to being able to
6683 * suppress the warning */
6684 case EXPR_UNARY_CAST: {
6685 type_t *const type = skip_typeref(expr->base.type);
6686 return is_type_atomic(type, ATOMIC_TYPE_VOID);
6689 case EXPR_UNARY_CAST_IMPLICIT: return true;
6690 case EXPR_UNARY_ASSUME: return true;
6692 case EXPR_BINARY_ADD: return false;
6693 case EXPR_BINARY_SUB: return false;
6694 case EXPR_BINARY_MUL: return false;
6695 case EXPR_BINARY_DIV: return false;
6696 case EXPR_BINARY_MOD: return false;
6697 case EXPR_BINARY_EQUAL: return false;
6698 case EXPR_BINARY_NOTEQUAL: return false;
6699 case EXPR_BINARY_LESS: return false;
6700 case EXPR_BINARY_LESSEQUAL: return false;
6701 case EXPR_BINARY_GREATER: return false;
6702 case EXPR_BINARY_GREATEREQUAL: return false;
6703 case EXPR_BINARY_BITWISE_AND: return false;
6704 case EXPR_BINARY_BITWISE_OR: return false;
6705 case EXPR_BINARY_BITWISE_XOR: return false;
6706 case EXPR_BINARY_SHIFTLEFT: return false;
6707 case EXPR_BINARY_SHIFTRIGHT: return false;
6708 case EXPR_BINARY_ASSIGN: return true;
6709 case EXPR_BINARY_MUL_ASSIGN: return true;
6710 case EXPR_BINARY_DIV_ASSIGN: return true;
6711 case EXPR_BINARY_MOD_ASSIGN: return true;
6712 case EXPR_BINARY_ADD_ASSIGN: return true;
6713 case EXPR_BINARY_SUB_ASSIGN: return true;
6714 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
6715 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
6716 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
6717 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
6718 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
6720 /* Only examine the right hand side of && and ||, because the left hand
6721 * side already has the effect of controlling the execution of the right
6723 case EXPR_BINARY_LOGICAL_AND:
6724 case EXPR_BINARY_LOGICAL_OR:
6725 /* Only examine the right hand side of a comma expression, because the left
6726 * hand side has a separate warning */
6727 case EXPR_BINARY_COMMA:
6728 return expression_has_effect(expr->binary.right);
6730 case EXPR_BINARY_BUILTIN_EXPECT: return true;
6731 case EXPR_BINARY_ISGREATER: return false;
6732 case EXPR_BINARY_ISGREATEREQUAL: return false;
6733 case EXPR_BINARY_ISLESS: return false;
6734 case EXPR_BINARY_ISLESSEQUAL: return false;
6735 case EXPR_BINARY_ISLESSGREATER: return false;
6736 case EXPR_BINARY_ISUNORDERED: return false;
6739 internal_errorf(HERE, "unexpected expression");
6742 static void semantic_comma(binary_expression_t *expression)
6744 if (warning.unused_value) {
6745 const expression_t *const left = expression->left;
6746 if (!expression_has_effect(left)) {
6747 warningf(&left->base.source_position,
6748 "left-hand operand of comma expression has no effect");
6751 expression->base.type = expression->right->base.type;
6754 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
6755 static expression_t *parse_##binexpression_type(unsigned precedence, \
6756 expression_t *left) \
6759 source_position_t pos = *HERE; \
6761 expression_t *right = parse_sub_expression(precedence + lr); \
6763 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
6764 binexpr->base.source_position = pos; \
6765 binexpr->binary.left = left; \
6766 binexpr->binary.right = right; \
6767 sfunc(&binexpr->binary); \
6772 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
6773 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
6774 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
6775 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
6776 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
6777 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
6778 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
6779 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
6780 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
6782 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
6783 semantic_comparison, 1)
6784 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
6785 semantic_comparison, 1)
6786 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
6787 semantic_comparison, 1)
6788 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
6789 semantic_comparison, 1)
6791 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
6792 semantic_binexpr_arithmetic, 1)
6793 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
6794 semantic_binexpr_arithmetic, 1)
6795 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
6796 semantic_binexpr_arithmetic, 1)
6797 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
6798 semantic_logical_op, 1)
6799 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
6800 semantic_logical_op, 1)
6801 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
6802 semantic_shift_op, 1)
6803 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
6804 semantic_shift_op, 1)
6805 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
6806 semantic_arithmetic_addsubb_assign, 0)
6807 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
6808 semantic_arithmetic_addsubb_assign, 0)
6809 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
6810 semantic_arithmetic_assign, 0)
6811 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
6812 semantic_arithmetic_assign, 0)
6813 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
6814 semantic_arithmetic_assign, 0)
6815 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
6816 semantic_arithmetic_assign, 0)
6817 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6818 semantic_arithmetic_assign, 0)
6819 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
6820 semantic_arithmetic_assign, 0)
6821 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
6822 semantic_arithmetic_assign, 0)
6823 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
6824 semantic_arithmetic_assign, 0)
6826 static expression_t *parse_sub_expression(unsigned precedence)
6828 if(token.type < 0) {
6829 return expected_expression_error();
6832 expression_parser_function_t *parser
6833 = &expression_parsers[token.type];
6834 source_position_t source_position = token.source_position;
6837 if(parser->parser != NULL) {
6838 left = parser->parser(parser->precedence);
6840 left = parse_primary_expression();
6842 assert(left != NULL);
6843 left->base.source_position = source_position;
6846 if(token.type < 0) {
6847 return expected_expression_error();
6850 parser = &expression_parsers[token.type];
6851 if(parser->infix_parser == NULL)
6853 if(parser->infix_precedence < precedence)
6856 left = parser->infix_parser(parser->infix_precedence, left);
6858 assert(left != NULL);
6859 assert(left->kind != EXPR_UNKNOWN);
6860 left->base.source_position = source_position;
6867 * Parse an expression.
6869 static expression_t *parse_expression(void)
6871 return parse_sub_expression(1);
6875 * Register a parser for a prefix-like operator with given precedence.
6877 * @param parser the parser function
6878 * @param token_type the token type of the prefix token
6879 * @param precedence the precedence of the operator
6881 static void register_expression_parser(parse_expression_function parser,
6882 int token_type, unsigned precedence)
6884 expression_parser_function_t *entry = &expression_parsers[token_type];
6886 if(entry->parser != NULL) {
6887 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6888 panic("trying to register multiple expression parsers for a token");
6890 entry->parser = parser;
6891 entry->precedence = precedence;
6895 * Register a parser for an infix operator with given precedence.
6897 * @param parser the parser function
6898 * @param token_type the token type of the infix operator
6899 * @param precedence the precedence of the operator
6901 static void register_infix_parser(parse_expression_infix_function parser,
6902 int token_type, unsigned precedence)
6904 expression_parser_function_t *entry = &expression_parsers[token_type];
6906 if(entry->infix_parser != NULL) {
6907 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6908 panic("trying to register multiple infix expression parsers for a "
6911 entry->infix_parser = parser;
6912 entry->infix_precedence = precedence;
6916 * Initialize the expression parsers.
6918 static void init_expression_parsers(void)
6920 memset(&expression_parsers, 0, sizeof(expression_parsers));
6922 register_infix_parser(parse_array_expression, '[', 30);
6923 register_infix_parser(parse_call_expression, '(', 30);
6924 register_infix_parser(parse_select_expression, '.', 30);
6925 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
6926 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
6928 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
6931 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
6932 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
6933 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
6934 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
6935 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
6936 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
6937 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
6938 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
6939 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
6940 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
6941 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
6942 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
6943 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
6944 T_EXCLAMATIONMARKEQUAL, 13);
6945 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
6946 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
6947 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
6948 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
6949 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
6950 register_infix_parser(parse_conditional_expression, '?', 7);
6951 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
6952 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
6953 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
6954 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
6955 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
6956 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
6957 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
6958 T_LESSLESSEQUAL, 2);
6959 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6960 T_GREATERGREATEREQUAL, 2);
6961 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
6963 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
6965 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
6968 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
6970 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
6971 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
6972 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
6973 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
6974 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
6975 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
6976 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
6978 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
6980 register_expression_parser(parse_sizeof, T_sizeof, 25);
6981 register_expression_parser(parse_alignof, T___alignof__, 25);
6982 register_expression_parser(parse_extension, T___extension__, 25);
6983 register_expression_parser(parse_builtin_classify_type,
6984 T___builtin_classify_type, 25);
6988 * Parse a asm statement constraints specification.
6990 static asm_constraint_t *parse_asm_constraints(void)
6992 asm_constraint_t *result = NULL;
6993 asm_constraint_t *last = NULL;
6995 while(token.type == T_STRING_LITERAL || token.type == '[') {
6996 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
6997 memset(constraint, 0, sizeof(constraint[0]));
6999 if(token.type == '[') {
7001 if(token.type != T_IDENTIFIER) {
7002 parse_error_expected("while parsing asm constraint",
7003 T_IDENTIFIER, NULL);
7006 constraint->symbol = token.v.symbol;
7011 constraint->constraints = parse_string_literals();
7013 constraint->expression = parse_expression();
7017 last->next = constraint;
7019 result = constraint;
7023 if(token.type != ',')
7034 * Parse a asm statement clobber specification.
7036 static asm_clobber_t *parse_asm_clobbers(void)
7038 asm_clobber_t *result = NULL;
7039 asm_clobber_t *last = NULL;
7041 while(token.type == T_STRING_LITERAL) {
7042 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
7043 clobber->clobber = parse_string_literals();
7046 last->next = clobber;
7052 if(token.type != ',')
7061 * Parse an asm statement.
7063 static statement_t *parse_asm_statement(void)
7067 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7068 statement->base.source_position = token.source_position;
7070 asm_statement_t *asm_statement = &statement->asms;
7072 if(token.type == T_volatile) {
7074 asm_statement->is_volatile = true;
7078 add_anchor_token(')');
7079 add_anchor_token(':');
7080 asm_statement->asm_text = parse_string_literals();
7082 if(token.type != ':') {
7083 rem_anchor_token(':');
7088 asm_statement->inputs = parse_asm_constraints();
7089 if(token.type != ':') {
7090 rem_anchor_token(':');
7095 asm_statement->outputs = parse_asm_constraints();
7096 if(token.type != ':') {
7097 rem_anchor_token(':');
7100 rem_anchor_token(':');
7103 asm_statement->clobbers = parse_asm_clobbers();
7106 rem_anchor_token(')');
7111 return create_invalid_statement();
7115 * Parse a case statement.
7117 static statement_t *parse_case_statement(void)
7121 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7123 statement->base.source_position = token.source_position;
7124 statement->case_label.expression = parse_expression();
7126 if (c_mode & _GNUC) {
7127 if (token.type == T_DOTDOTDOT) {
7129 statement->case_label.end_range = parse_expression();
7135 if (! is_constant_expression(statement->case_label.expression)) {
7136 errorf(&statement->base.source_position,
7137 "case label does not reduce to an integer constant");
7139 /* TODO: check if the case label is already known */
7140 if (current_switch != NULL) {
7141 /* link all cases into the switch statement */
7142 if (current_switch->last_case == NULL) {
7143 current_switch->first_case =
7144 current_switch->last_case = &statement->case_label;
7146 current_switch->last_case->next = &statement->case_label;
7149 errorf(&statement->base.source_position,
7150 "case label not within a switch statement");
7153 statement->case_label.statement = parse_statement();
7157 return create_invalid_statement();
7161 * Finds an existing default label of a switch statement.
7163 static case_label_statement_t *
7164 find_default_label(const switch_statement_t *statement)
7166 case_label_statement_t *label = statement->first_case;
7167 for ( ; label != NULL; label = label->next) {
7168 if (label->expression == NULL)
7175 * Parse a default statement.
7177 static statement_t *parse_default_statement(void)
7181 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7183 statement->base.source_position = token.source_position;
7186 if (current_switch != NULL) {
7187 const case_label_statement_t *def_label = find_default_label(current_switch);
7188 if (def_label != NULL) {
7189 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7190 &def_label->base.source_position);
7192 /* link all cases into the switch statement */
7193 if (current_switch->last_case == NULL) {
7194 current_switch->first_case =
7195 current_switch->last_case = &statement->case_label;
7197 current_switch->last_case->next = &statement->case_label;
7201 errorf(&statement->base.source_position,
7202 "'default' label not within a switch statement");
7204 statement->case_label.statement = parse_statement();
7208 return create_invalid_statement();
7212 * Return the declaration for a given label symbol or create a new one.
7214 static declaration_t *get_label(symbol_t *symbol)
7216 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7217 assert(current_function != NULL);
7218 /* if we found a label in the same function, then we already created the
7220 if(candidate != NULL
7221 && candidate->parent_scope == ¤t_function->scope) {
7225 /* otherwise we need to create a new one */
7226 declaration_t *const declaration = allocate_declaration_zero();
7227 declaration->namespc = NAMESPACE_LABEL;
7228 declaration->symbol = symbol;
7230 label_push(declaration);
7236 * Parse a label statement.
7238 static statement_t *parse_label_statement(void)
7240 assert(token.type == T_IDENTIFIER);
7241 symbol_t *symbol = token.v.symbol;
7244 declaration_t *label = get_label(symbol);
7246 /* if source position is already set then the label is defined twice,
7247 * otherwise it was just mentioned in a goto so far */
7248 if(label->source_position.input_name != NULL) {
7249 errorf(HERE, "duplicate label '%Y' (declared %P)",
7250 symbol, &label->source_position);
7252 label->source_position = token.source_position;
7255 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7257 statement->base.source_position = token.source_position;
7258 statement->label.label = label;
7262 if(token.type == '}') {
7263 /* TODO only warn? */
7265 warningf(HERE, "label at end of compound statement");
7266 statement->label.statement = create_empty_statement();
7268 errorf(HERE, "label at end of compound statement");
7269 statement->label.statement = create_invalid_statement();
7273 if (token.type == ';') {
7274 /* eat an empty statement here, to avoid the warning about an empty
7275 * after a label. label:; is commonly used to have a label before
7277 statement->label.statement = create_empty_statement();
7280 statement->label.statement = parse_statement();
7284 /* remember the labels's in a list for later checking */
7285 if (label_last == NULL) {
7286 label_first = &statement->label;
7288 label_last->next = &statement->label;
7290 label_last = &statement->label;
7296 * Parse an if statement.
7298 static statement_t *parse_if(void)
7302 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7303 statement->base.source_position = token.source_position;
7306 add_anchor_token(')');
7307 statement->ifs.condition = parse_expression();
7308 rem_anchor_token(')');
7311 add_anchor_token(T_else);
7312 statement->ifs.true_statement = parse_statement();
7313 rem_anchor_token(T_else);
7315 if(token.type == T_else) {
7317 statement->ifs.false_statement = parse_statement();
7322 return create_invalid_statement();
7326 * Parse a switch statement.
7328 static statement_t *parse_switch(void)
7332 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7333 statement->base.source_position = token.source_position;
7336 expression_t *const expr = parse_expression();
7337 type_t * type = skip_typeref(expr->base.type);
7338 if (is_type_integer(type)) {
7339 type = promote_integer(type);
7340 } else if (is_type_valid(type)) {
7341 errorf(&expr->base.source_position,
7342 "switch quantity is not an integer, but '%T'", type);
7343 type = type_error_type;
7345 statement->switchs.expression = create_implicit_cast(expr, type);
7348 switch_statement_t *rem = current_switch;
7349 current_switch = &statement->switchs;
7350 statement->switchs.body = parse_statement();
7351 current_switch = rem;
7353 if(warning.switch_default &&
7354 find_default_label(&statement->switchs) == NULL) {
7355 warningf(&statement->base.source_position, "switch has no default case");
7360 return create_invalid_statement();
7363 static statement_t *parse_loop_body(statement_t *const loop)
7365 statement_t *const rem = current_loop;
7366 current_loop = loop;
7368 statement_t *const body = parse_statement();
7375 * Parse a while statement.
7377 static statement_t *parse_while(void)
7381 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7382 statement->base.source_position = token.source_position;
7385 add_anchor_token(')');
7386 statement->whiles.condition = parse_expression();
7387 rem_anchor_token(')');
7390 statement->whiles.body = parse_loop_body(statement);
7394 return create_invalid_statement();
7398 * Parse a do statement.
7400 static statement_t *parse_do(void)
7404 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7406 statement->base.source_position = token.source_position;
7408 add_anchor_token(T_while);
7409 statement->do_while.body = parse_loop_body(statement);
7410 rem_anchor_token(T_while);
7414 add_anchor_token(')');
7415 statement->do_while.condition = parse_expression();
7416 rem_anchor_token(')');
7422 return create_invalid_statement();
7426 * Parse a for statement.
7428 static statement_t *parse_for(void)
7432 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7433 statement->base.source_position = token.source_position;
7435 int top = environment_top();
7436 scope_t *last_scope = scope;
7437 set_scope(&statement->fors.scope);
7440 add_anchor_token(')');
7442 if(token.type != ';') {
7443 if(is_declaration_specifier(&token, false)) {
7444 parse_declaration(record_declaration);
7446 add_anchor_token(';');
7447 expression_t *const init = parse_expression();
7448 statement->fors.initialisation = init;
7449 if (warning.unused_value && !expression_has_effect(init)) {
7450 warningf(&init->base.source_position,
7451 "initialisation of 'for'-statement has no effect");
7453 rem_anchor_token(';');
7460 if(token.type != ';') {
7461 add_anchor_token(';');
7462 statement->fors.condition = parse_expression();
7463 rem_anchor_token(';');
7466 if(token.type != ')') {
7467 expression_t *const step = parse_expression();
7468 statement->fors.step = step;
7469 if (warning.unused_value && !expression_has_effect(step)) {
7470 warningf(&step->base.source_position,
7471 "step of 'for'-statement has no effect");
7474 rem_anchor_token(')');
7476 statement->fors.body = parse_loop_body(statement);
7478 assert(scope == &statement->fors.scope);
7479 set_scope(last_scope);
7480 environment_pop_to(top);
7485 rem_anchor_token(')');
7486 assert(scope == &statement->fors.scope);
7487 set_scope(last_scope);
7488 environment_pop_to(top);
7490 return create_invalid_statement();
7494 * Parse a goto statement.
7496 static statement_t *parse_goto(void)
7500 if(token.type != T_IDENTIFIER) {
7501 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
7505 symbol_t *symbol = token.v.symbol;
7508 declaration_t *label = get_label(symbol);
7510 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
7511 statement->base.source_position = token.source_position;
7513 statement->gotos.label = label;
7515 /* remember the goto's in a list for later checking */
7516 if (goto_last == NULL) {
7517 goto_first = &statement->gotos;
7519 goto_last->next = &statement->gotos;
7521 goto_last = &statement->gotos;
7527 return create_invalid_statement();
7531 * Parse a continue statement.
7533 static statement_t *parse_continue(void)
7535 statement_t *statement;
7536 if (current_loop == NULL) {
7537 errorf(HERE, "continue statement not within loop");
7538 statement = create_invalid_statement();
7540 statement = allocate_statement_zero(STATEMENT_CONTINUE);
7542 statement->base.source_position = token.source_position;
7550 return create_invalid_statement();
7554 * Parse a break statement.
7556 static statement_t *parse_break(void)
7558 statement_t *statement;
7559 if (current_switch == NULL && current_loop == NULL) {
7560 errorf(HERE, "break statement not within loop or switch");
7561 statement = create_invalid_statement();
7563 statement = allocate_statement_zero(STATEMENT_BREAK);
7565 statement->base.source_position = token.source_position;
7573 return create_invalid_statement();
7577 * Parse a __leave statement.
7579 static statement_t *parse_leave(void)
7581 statement_t *statement;
7582 if (current_try == NULL) {
7583 errorf(HERE, "__leave statement not within __try");
7584 statement = create_invalid_statement();
7586 statement = allocate_statement_zero(STATEMENT_LEAVE);
7588 statement->base.source_position = token.source_position;
7596 return create_invalid_statement();
7600 * Check if a given declaration represents a local variable.
7602 static bool is_local_var_declaration(const declaration_t *declaration) {
7603 switch ((storage_class_tag_t) declaration->storage_class) {
7604 case STORAGE_CLASS_AUTO:
7605 case STORAGE_CLASS_REGISTER: {
7606 const type_t *type = skip_typeref(declaration->type);
7607 if(is_type_function(type)) {
7619 * Check if a given declaration represents a variable.
7621 static bool is_var_declaration(const declaration_t *declaration) {
7622 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF)
7625 const type_t *type = skip_typeref(declaration->type);
7626 return !is_type_function(type);
7630 * Check if a given expression represents a local variable.
7632 static bool is_local_variable(const expression_t *expression)
7634 if (expression->base.kind != EXPR_REFERENCE) {
7637 const declaration_t *declaration = expression->reference.declaration;
7638 return is_local_var_declaration(declaration);
7642 * Check if a given expression represents a local variable and
7643 * return its declaration then, else return NULL.
7645 declaration_t *expr_is_variable(const expression_t *expression)
7647 if (expression->base.kind != EXPR_REFERENCE) {
7650 declaration_t *declaration = expression->reference.declaration;
7651 if (is_var_declaration(declaration))
7657 * Parse a return statement.
7659 static statement_t *parse_return(void)
7661 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
7662 statement->base.source_position = token.source_position;
7666 expression_t *return_value = NULL;
7667 if(token.type != ';') {
7668 return_value = parse_expression();
7672 const type_t *const func_type = current_function->type;
7673 assert(is_type_function(func_type));
7674 type_t *const return_type = skip_typeref(func_type->function.return_type);
7676 if(return_value != NULL) {
7677 type_t *return_value_type = skip_typeref(return_value->base.type);
7679 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
7680 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
7681 warningf(&statement->base.source_position,
7682 "'return' with a value, in function returning void");
7683 return_value = NULL;
7685 type_t *const res_type = semantic_assign(return_type,
7686 return_value, "'return'", &statement->base.source_position);
7687 if (res_type == NULL) {
7688 errorf(&statement->base.source_position,
7689 "cannot return something of type '%T' in function returning '%T'",
7690 return_value->base.type, return_type);
7692 return_value = create_implicit_cast(return_value, res_type);
7695 /* check for returning address of a local var */
7696 if (return_value != NULL &&
7697 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
7698 const expression_t *expression = return_value->unary.value;
7699 if (is_local_variable(expression)) {
7700 warningf(&statement->base.source_position,
7701 "function returns address of local variable");
7705 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
7706 warningf(&statement->base.source_position,
7707 "'return' without value, in function returning non-void");
7710 statement->returns.value = return_value;
7714 return create_invalid_statement();
7718 * Parse a declaration statement.
7720 static statement_t *parse_declaration_statement(void)
7722 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
7724 statement->base.source_position = token.source_position;
7726 declaration_t *before = last_declaration;
7727 parse_declaration(record_declaration);
7729 if(before == NULL) {
7730 statement->declaration.declarations_begin = scope->declarations;
7732 statement->declaration.declarations_begin = before->next;
7734 statement->declaration.declarations_end = last_declaration;
7740 * Parse an expression statement, ie. expr ';'.
7742 static statement_t *parse_expression_statement(void)
7744 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
7746 statement->base.source_position = token.source_position;
7747 expression_t *const expr = parse_expression();
7748 statement->expression.expression = expr;
7754 return create_invalid_statement();
7758 * Parse a microsoft __try { } __finally { } or
7759 * __try{ } __except() { }
7761 static statement_t *parse_ms_try_statment(void) {
7762 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
7764 statement->base.source_position = token.source_position;
7767 ms_try_statement_t *rem = current_try;
7768 current_try = &statement->ms_try;
7769 statement->ms_try.try_statement = parse_compound_statement(false);
7772 if(token.type == T___except) {
7775 add_anchor_token(')');
7776 expression_t *const expr = parse_expression();
7777 type_t * type = skip_typeref(expr->base.type);
7778 if (is_type_integer(type)) {
7779 type = promote_integer(type);
7780 } else if (is_type_valid(type)) {
7781 errorf(&expr->base.source_position,
7782 "__expect expression is not an integer, but '%T'", type);
7783 type = type_error_type;
7785 statement->ms_try.except_expression = create_implicit_cast(expr, type);
7786 rem_anchor_token(')');
7788 statement->ms_try.final_statement = parse_compound_statement(false);
7789 } else if(token.type == T__finally) {
7791 statement->ms_try.final_statement = parse_compound_statement(false);
7793 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
7794 return create_invalid_statement();
7798 return create_invalid_statement();
7802 * Parse a statement.
7803 * There's also parse_statement() which additionally checks for
7804 * "statement has no effect" warnings
7806 static statement_t *intern_parse_statement(void)
7808 statement_t *statement = NULL;
7810 /* declaration or statement */
7811 add_anchor_token(';');
7812 switch(token.type) {
7814 statement = parse_asm_statement();
7818 statement = parse_case_statement();
7822 statement = parse_default_statement();
7826 statement = parse_compound_statement(false);
7830 statement = parse_if();
7834 statement = parse_switch();
7838 statement = parse_while();
7842 statement = parse_do();
7846 statement = parse_for();
7850 statement = parse_goto();
7854 statement = parse_continue();
7858 statement = parse_break();
7862 statement = parse_leave();
7866 statement = parse_return();
7870 if(warning.empty_statement) {
7871 warningf(HERE, "statement is empty");
7873 statement = create_empty_statement();
7878 if(look_ahead(1)->type == ':') {
7879 statement = parse_label_statement();
7883 if(is_typedef_symbol(token.v.symbol)) {
7884 statement = parse_declaration_statement();
7888 statement = parse_expression_statement();
7891 case T___extension__:
7892 /* this can be a prefix to a declaration or an expression statement */
7893 /* we simply eat it now and parse the rest with tail recursion */
7896 } while(token.type == T___extension__);
7897 statement = parse_statement();
7901 statement = parse_declaration_statement();
7905 statement = parse_ms_try_statment();
7909 statement = parse_expression_statement();
7912 rem_anchor_token(';');
7914 assert(statement != NULL
7915 && statement->base.source_position.input_name != NULL);
7921 * parse a statement and emits "statement has no effect" warning if needed
7922 * (This is really a wrapper around intern_parse_statement with check for 1
7923 * single warning. It is needed, because for statement expressions we have
7924 * to avoid the warning on the last statement)
7926 static statement_t *parse_statement(void)
7928 statement_t *statement = intern_parse_statement();
7930 if(statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
7931 expression_t *expression = statement->expression.expression;
7932 if(!expression_has_effect(expression)) {
7933 warningf(&expression->base.source_position,
7934 "statement has no effect");
7942 * Parse a compound statement.
7944 static statement_t *parse_compound_statement(bool inside_expression_statement)
7946 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
7948 statement->base.source_position = token.source_position;
7951 add_anchor_token('}');
7953 int top = environment_top();
7954 scope_t *last_scope = scope;
7955 set_scope(&statement->compound.scope);
7957 statement_t *last_statement = NULL;
7959 while(token.type != '}' && token.type != T_EOF) {
7960 statement_t *sub_statement = intern_parse_statement();
7961 if(is_invalid_statement(sub_statement)) {
7962 /* an error occurred. if we are at an anchor, return */
7968 if(last_statement != NULL) {
7969 last_statement->base.next = sub_statement;
7971 statement->compound.statements = sub_statement;
7974 while(sub_statement->base.next != NULL)
7975 sub_statement = sub_statement->base.next;
7977 last_statement = sub_statement;
7980 if(token.type == '}') {
7983 errorf(&statement->base.source_position,
7984 "end of file while looking for closing '}'");
7987 /* look over all statements again to produce no effect warnings */
7988 if(warning.unused_value) {
7989 statement_t *sub_statement = statement->compound.statements;
7990 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
7991 if(sub_statement->kind != STATEMENT_EXPRESSION)
7993 /* don't emit a warning for the last expression in an expression
7994 * statement as it has always an effect */
7995 if(inside_expression_statement && sub_statement->base.next == NULL)
7998 expression_t *expression = sub_statement->expression.expression;
7999 if(!expression_has_effect(expression)) {
8000 warningf(&expression->base.source_position,
8001 "statement has no effect");
8007 rem_anchor_token('}');
8008 assert(scope == &statement->compound.scope);
8009 set_scope(last_scope);
8010 environment_pop_to(top);
8016 * Initialize builtin types.
8018 static void initialize_builtin_types(void)
8020 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
8021 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
8022 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
8023 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
8024 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
8025 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
8026 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
8027 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
8029 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
8030 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
8031 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
8032 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
8036 * Check for unused global static functions and variables
8038 static void check_unused_globals(void)
8040 if (!warning.unused_function && !warning.unused_variable)
8043 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
8044 if (decl->used || decl->storage_class != STORAGE_CLASS_STATIC)
8047 type_t *const type = decl->type;
8049 if (is_type_function(skip_typeref(type))) {
8050 if (!warning.unused_function || decl->is_inline)
8053 s = (decl->init.statement != NULL ? "defined" : "declared");
8055 if (!warning.unused_variable)
8061 warningf(&decl->source_position, "'%#T' %s but not used",
8062 type, decl->symbol, s);
8067 * Parse a translation unit.
8069 static translation_unit_t *parse_translation_unit(void)
8071 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
8073 assert(global_scope == NULL);
8074 global_scope = &unit->scope;
8076 assert(scope == NULL);
8077 set_scope(&unit->scope);
8079 initialize_builtin_types();
8081 while(token.type != T_EOF) {
8082 if (token.type == ';') {
8083 /* TODO error in strict mode */
8084 warningf(HERE, "stray ';' outside of function");
8087 parse_external_declaration();
8091 assert(scope == &unit->scope);
8093 last_declaration = NULL;
8095 assert(global_scope == &unit->scope);
8096 check_unused_globals();
8097 global_scope = NULL;
8105 * @return the translation unit or NULL if errors occurred.
8107 translation_unit_t *parse(void)
8109 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8110 label_stack = NEW_ARR_F(stack_entry_t, 0);
8111 diagnostic_count = 0;
8115 type_set_output(stderr);
8116 ast_set_output(stderr);
8118 lookahead_bufpos = 0;
8119 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8122 translation_unit_t *unit = parse_translation_unit();
8124 DEL_ARR_F(environment_stack);
8125 DEL_ARR_F(label_stack);
8131 * Initialize the parser.
8133 void init_parser(void)
8136 /* add predefined symbols for extended-decl-modifier */
8137 sym_align = symbol_table_insert("align");
8138 sym_allocate = symbol_table_insert("allocate");
8139 sym_dllimport = symbol_table_insert("dllimport");
8140 sym_dllexport = symbol_table_insert("dllexport");
8141 sym_naked = symbol_table_insert("naked");
8142 sym_noinline = symbol_table_insert("noinline");
8143 sym_noreturn = symbol_table_insert("noreturn");
8144 sym_nothrow = symbol_table_insert("nothrow");
8145 sym_novtable = symbol_table_insert("novtable");
8146 sym_property = symbol_table_insert("property");
8147 sym_get = symbol_table_insert("get");
8148 sym_put = symbol_table_insert("put");
8149 sym_selectany = symbol_table_insert("selectany");
8150 sym_thread = symbol_table_insert("thread");
8151 sym_uuid = symbol_table_insert("uuid");
8152 sym_deprecated = symbol_table_insert("deprecated");
8153 sym_restrict = symbol_table_insert("restrict");
8154 sym_noalias = symbol_table_insert("noalias");
8156 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8158 init_expression_parsers();
8159 obstack_init(&temp_obst);
8161 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8162 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8166 * Terminate the parser.
8168 void exit_parser(void)
8170 obstack_free(&temp_obst, NULL);