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;
1103 * parse one constant expression argument.
1105 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute) {
1106 expression_t *expression;
1107 add_anchor_token(')');
1108 expression = parse_constant_expression();
1109 rem_anchor_token(')');
1114 attribute->invalid = true;
1118 * parse a list of constant expressions arguments.
1120 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute) {
1121 expression_t *expression;
1122 add_anchor_token(')');
1123 add_anchor_token(',');
1125 expression = parse_constant_expression();
1126 if(token.type != ',')
1130 rem_anchor_token(',');
1131 rem_anchor_token(')');
1136 attribute->invalid = true;
1140 * parse one string literal argument.
1142 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1145 add_anchor_token('(');
1146 if(token.type != T_STRING_LITERAL) {
1147 parse_error_expected("while parsing attribute directive",
1148 T_STRING_LITERAL, NULL);
1151 *string = parse_string_literals();
1152 rem_anchor_token('(');
1156 attribute->invalid = true;
1160 * parse one tls model.
1162 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute) {
1163 static const char *tls_models[] = {
1169 string_t string = { NULL, 0 };
1170 parse_gnu_attribute_string_arg(attribute, &string);
1171 if(string.begin != NULL) {
1172 for(size_t i = 0; i < 4; ++i) {
1173 if(strcmp(tls_models[i], string.begin) == 0) {
1174 attribute->u.value = i;
1179 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1180 attribute->invalid = true;
1184 * parse one tls model.
1186 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute) {
1187 static const char *visibilities[] = {
1193 string_t string = { NULL, 0 };
1194 parse_gnu_attribute_string_arg(attribute, &string);
1195 if(string.begin != NULL) {
1196 for(size_t i = 0; i < 4; ++i) {
1197 if(strcmp(visibilities[i], string.begin) == 0) {
1198 attribute->u.value = i;
1203 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1204 attribute->invalid = true;
1208 * parse one (code) model.
1210 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute) {
1211 static const char *visibilities[] = {
1216 string_t string = { NULL, 0 };
1217 parse_gnu_attribute_string_arg(attribute, &string);
1218 if(string.begin != NULL) {
1219 for(int i = 0; i < 3; ++i) {
1220 if(strcmp(visibilities[i], string.begin) == 0) {
1221 attribute->u.value = i;
1226 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1227 attribute->invalid = true;
1230 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1232 /* TODO: find out what is allowed here... */
1234 /* at least: byte, word, pointer, list of machine modes
1235 * __XXX___ is interpreted as XXX */
1236 add_anchor_token(')');
1237 expect(T_IDENTIFIER);
1238 rem_anchor_token(')');
1242 attribute->invalid = true;
1246 * parse one interrupt argument.
1248 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute) {
1249 static const char *interrupts[] = {
1256 string_t string = { NULL, 0 };
1257 parse_gnu_attribute_string_arg(attribute, &string);
1258 if(string.begin != NULL) {
1259 for(size_t i = 0; i < 5; ++i) {
1260 if(strcmp(interrupts[i], string.begin) == 0) {
1261 attribute->u.value = i;
1266 errorf(HERE, "'%s' is an interrupt", string.begin);
1267 attribute->invalid = true;
1271 * parse ( identifier, const expression, const expression )
1273 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute) {
1274 static const char *format_names[] = {
1282 if(token.type != T_IDENTIFIER) {
1283 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1286 const char *name = token.v.symbol->string;
1287 for(i = 0; i < 4; ++i) {
1288 if(strcmp_underscore(format_names[i], name) == 0)
1292 if(warning.attribute)
1293 warningf(HERE, "'%s' is an unrecognized format function type", name);
1298 add_anchor_token(')');
1299 add_anchor_token(',');
1300 parse_constant_expression();
1301 rem_anchor_token(',');
1302 rem_anchor_token('(');
1305 add_anchor_token(')');
1306 parse_constant_expression();
1307 rem_anchor_token('(');
1311 attribute->u.value = true;
1315 * Parse one GNU attribute.
1317 * Note that attribute names can be specified WITH or WITHOUT
1318 * double underscores, ie const or __const__.
1320 * The following attributes are parsed without arguments
1345 * no_instrument_function
1346 * warn_unused_result
1363 * externally_visible
1371 * The following attributes are parsed with arguments
1372 * aligned( const expression )
1373 * alias( string literal )
1374 * section( string literal )
1375 * format( identifier, const expression, const expression )
1376 * format_arg( const expression )
1377 * tls_model( string literal )
1378 * visibility( string literal )
1379 * regparm( const expression )
1380 * model( string leteral )
1381 * trap_exit( const expression )
1382 * sp_switch( string literal )
1384 * The following attributes might have arguments
1385 * weak_ref( string literal )
1386 * non_null( const expression // ',' )
1387 * interrupt( string literal )
1388 * sentinel( constant expression )
1390 static void parse_gnu_attribute(gnu_attribute_t **attributes)
1392 gnu_attribute_t *head = *attributes;
1393 gnu_attribute_t *last = *attributes;
1394 gnu_attribute_t *attribute;
1396 eat(T___attribute__);
1400 if(token.type != ')') {
1401 /* find the end of the list */
1403 while(last->next != NULL)
1407 /* non-empty attribute list */
1410 if(token.type == T_const) {
1412 } else if(token.type == T_volatile) {
1414 } else if(token.type == T_cdecl) {
1415 /* __attribute__((cdecl)), WITH ms mode */
1417 } else if(token.type != T_IDENTIFIER) {
1418 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1421 const symbol_t *sym = token.v.symbol;
1426 for(i = 0; i < GNU_AK_LAST; ++i) {
1427 if(strcmp_underscore(gnu_attribute_names[i], name) == 0)
1430 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1433 if(kind == GNU_AK_LAST) {
1434 if(warning.attribute)
1435 warningf(HERE, "'%s' attribute directive ignored", name);
1437 /* skip possible arguments */
1438 if(token.type == '(') {
1439 eat_until_matching_token(')');
1442 /* check for arguments */
1443 attribute = allocate_gnu_attribute(kind);
1444 if(token.type == '(') {
1446 if(token.type == ')') {
1447 /* empty args are allowed */
1450 attribute->have_arguments = true;
1455 case GNU_AK_VOLATILE:
1457 case GNU_AK_STDCALL:
1458 case GNU_AK_FASTCALL:
1459 case GNU_AK_DEPRECATED:
1460 case GNU_AK_NOINLINE:
1461 case GNU_AK_NORETURN:
1464 case GNU_AK_ALWAYS_INLINE:
1467 case GNU_AK_CONSTRUCTOR:
1468 case GNU_AK_DESTRUCTOR:
1469 case GNU_AK_NOTHROW:
1470 case GNU_AK_TRANSPARENT_UNION:
1472 case GNU_AK_NOCOMMON:
1475 case GNU_AK_NOTSHARED:
1478 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1479 case GNU_AK_WARN_UNUSED_RESULT:
1480 case GNU_AK_LONGCALL:
1481 case GNU_AK_SHORTCALL:
1482 case GNU_AK_LONG_CALL:
1483 case GNU_AK_SHORT_CALL:
1484 case GNU_AK_FUNCTION_VECTOR:
1485 case GNU_AK_INTERRUPT_HANDLER:
1486 case GNU_AK_NMI_HANDLER:
1487 case GNU_AK_NESTING:
1491 case GNU_AK_EIGTHBIT_DATA:
1492 case GNU_AK_TINY_DATA:
1493 case GNU_AK_SAVEALL:
1494 case GNU_AK_FLATTEN:
1495 case GNU_AK_SSEREGPARM:
1496 case GNU_AK_EXTERNALLY_VISIBLE:
1497 case GNU_AK_RETURN_TWICE:
1498 case GNU_AK_MAY_ALIAS:
1499 case GNU_AK_MS_STRUCT:
1500 case GNU_AK_GCC_STRUCT:
1501 case GNU_AK_DLLIMPORT:
1502 case GNU_AK_DLLEXPORT:
1503 if(attribute->have_arguments) {
1504 /* should have no arguments */
1505 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1506 eat_until_matching_token('(');
1507 /* we have already consumed '(', so we stop before ')', eat it */
1509 attribute->invalid = true;
1513 case GNU_AK_ALIGNED:
1514 case GNU_AK_FORMAT_ARG:
1515 case GNU_AK_REGPARM:
1516 case GNU_AK_TRAP_EXIT:
1517 if(!attribute->have_arguments) {
1518 /* should have arguments */
1519 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1520 attribute->invalid = true;
1522 parse_gnu_attribute_const_arg(attribute);
1525 case GNU_AK_SECTION:
1526 case GNU_AK_SP_SWITCH:
1527 if(!attribute->have_arguments) {
1528 /* should have arguments */
1529 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1530 attribute->invalid = true;
1532 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1535 if(!attribute->have_arguments) {
1536 /* should have arguments */
1537 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1538 attribute->invalid = true;
1540 parse_gnu_attribute_format_args(attribute);
1542 case GNU_AK_WEAKREF:
1543 /* may have one string argument */
1544 if(attribute->have_arguments)
1545 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1547 case GNU_AK_NONNULL:
1548 if(attribute->have_arguments)
1549 parse_gnu_attribute_const_arg_list(attribute);
1551 case GNU_AK_TLS_MODEL:
1552 if(!attribute->have_arguments) {
1553 /* should have arguments */
1554 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1556 parse_gnu_attribute_tls_model_arg(attribute);
1558 case GNU_AK_VISIBILITY:
1559 if(!attribute->have_arguments) {
1560 /* should have arguments */
1561 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1563 parse_gnu_attribute_visibility_arg(attribute);
1566 if(!attribute->have_arguments) {
1567 /* should have arguments */
1568 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1570 parse_gnu_attribute_model_arg(attribute);
1574 if(!attribute->have_arguments) {
1575 /* should have arguments */
1576 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1578 parse_gnu_attribute_mode_arg(attribute);
1581 case GNU_AK_INTERRUPT:
1582 /* may have one string argument */
1583 if(attribute->have_arguments)
1584 parse_gnu_attribute_interrupt_arg(attribute);
1586 case GNU_AK_SENTINEL:
1587 /* may have one string argument */
1588 if(attribute->have_arguments)
1589 parse_gnu_attribute_const_arg(attribute);
1592 /* already handled */
1596 if(attribute != NULL) {
1598 last->next = attribute;
1601 head = last = attribute;
1605 if(token.type != ',')
1617 * Parse GNU attributes.
1619 static void parse_attributes(gnu_attribute_t **attributes)
1622 switch(token.type) {
1623 case T___attribute__: {
1624 parse_gnu_attribute(attributes);
1630 if(token.type != T_STRING_LITERAL) {
1631 parse_error_expected("while parsing assembler attribute",
1632 T_STRING_LITERAL, NULL);
1633 eat_until_matching_token('(');
1636 parse_string_literals();
1641 goto attributes_finished;
1645 attributes_finished:
1650 static designator_t *parse_designation(void)
1652 designator_t *result = NULL;
1653 designator_t *last = NULL;
1656 designator_t *designator;
1657 switch(token.type) {
1659 designator = allocate_ast_zero(sizeof(designator[0]));
1660 designator->source_position = token.source_position;
1662 add_anchor_token(']');
1663 designator->array_index = parse_constant_expression();
1664 rem_anchor_token(']');
1668 designator = allocate_ast_zero(sizeof(designator[0]));
1669 designator->source_position = token.source_position;
1671 if(token.type != T_IDENTIFIER) {
1672 parse_error_expected("while parsing designator",
1673 T_IDENTIFIER, NULL);
1676 designator->symbol = token.v.symbol;
1684 assert(designator != NULL);
1686 last->next = designator;
1688 result = designator;
1696 static initializer_t *initializer_from_string(array_type_t *type,
1697 const string_t *const string)
1699 /* TODO: check len vs. size of array type */
1702 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1703 initializer->string.string = *string;
1708 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1709 wide_string_t *const string)
1711 /* TODO: check len vs. size of array type */
1714 initializer_t *const initializer =
1715 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1716 initializer->wide_string.string = *string;
1722 * Build an initializer from a given expression.
1724 static initializer_t *initializer_from_expression(type_t *orig_type,
1725 expression_t *expression)
1727 /* TODO check that expression is a constant expression */
1729 /* § 6.7.8.14/15 char array may be initialized by string literals */
1730 type_t *type = skip_typeref(orig_type);
1731 type_t *expr_type_orig = expression->base.type;
1732 type_t *expr_type = skip_typeref(expr_type_orig);
1733 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1734 array_type_t *const array_type = &type->array;
1735 type_t *const element_type = skip_typeref(array_type->element_type);
1737 if (element_type->kind == TYPE_ATOMIC) {
1738 atomic_type_kind_t akind = element_type->atomic.akind;
1739 switch (expression->kind) {
1740 case EXPR_STRING_LITERAL:
1741 if (akind == ATOMIC_TYPE_CHAR
1742 || akind == ATOMIC_TYPE_SCHAR
1743 || akind == ATOMIC_TYPE_UCHAR) {
1744 return initializer_from_string(array_type,
1745 &expression->string.value);
1748 case EXPR_WIDE_STRING_LITERAL: {
1749 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1750 if (get_unqualified_type(element_type) == bare_wchar_type) {
1751 return initializer_from_wide_string(array_type,
1752 &expression->wide_string.value);
1762 type_t *const res_type = semantic_assign(type, expression, "initializer",
1763 &expression->base.source_position);
1764 if (res_type == NULL)
1767 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1768 result->value.value = create_implicit_cast(expression, res_type);
1774 * Checks if a given expression can be used as an constant initializer.
1776 static bool is_initializer_constant(const expression_t *expression)
1778 return is_constant_expression(expression)
1779 || is_address_constant(expression);
1783 * Parses an scalar initializer.
1785 * § 6.7.8.11; eat {} without warning
1787 static initializer_t *parse_scalar_initializer(type_t *type,
1788 bool must_be_constant)
1790 /* there might be extra {} hierarchies */
1792 while(token.type == '{') {
1795 warningf(HERE, "extra curly braces around scalar initializer");
1800 expression_t *expression = parse_assignment_expression();
1801 if(must_be_constant && !is_initializer_constant(expression)) {
1802 errorf(&expression->base.source_position,
1803 "Initialisation expression '%E' is not constant\n",
1807 initializer_t *initializer = initializer_from_expression(type, expression);
1809 if(initializer == NULL) {
1810 errorf(&expression->base.source_position,
1811 "expression '%E' (type '%T') doesn't match expected type '%T'",
1812 expression, expression->base.type, type);
1817 bool additional_warning_displayed = false;
1819 if(token.type == ',') {
1822 if(token.type != '}') {
1823 if(!additional_warning_displayed) {
1824 warningf(HERE, "additional elements in scalar initializer");
1825 additional_warning_displayed = true;
1836 * An entry in the type path.
1838 typedef struct type_path_entry_t type_path_entry_t;
1839 struct type_path_entry_t {
1840 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
1842 size_t index; /**< For array types: the current index. */
1843 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1848 * A type path expression a position inside compound or array types.
1850 typedef struct type_path_t type_path_t;
1851 struct type_path_t {
1852 type_path_entry_t *path; /**< An flexible array containing the current path. */
1853 type_t *top_type; /**< type of the element the path points */
1854 size_t max_index; /**< largest index in outermost array */
1858 * Prints a type path for debugging.
1860 static __attribute__((unused)) void debug_print_type_path(
1861 const type_path_t *path)
1863 size_t len = ARR_LEN(path->path);
1865 for(size_t i = 0; i < len; ++i) {
1866 const type_path_entry_t *entry = & path->path[i];
1868 type_t *type = skip_typeref(entry->type);
1869 if(is_type_compound(type)) {
1870 /* in gcc mode structs can have no members */
1871 if(entry->v.compound_entry == NULL) {
1875 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
1876 } else if(is_type_array(type)) {
1877 fprintf(stderr, "[%zd]", entry->v.index);
1879 fprintf(stderr, "-INVALID-");
1882 if(path->top_type != NULL) {
1883 fprintf(stderr, " (");
1884 print_type(path->top_type);
1885 fprintf(stderr, ")");
1890 * Return the top type path entry, ie. in a path
1891 * (type).a.b returns the b.
1893 static type_path_entry_t *get_type_path_top(const type_path_t *path)
1895 size_t len = ARR_LEN(path->path);
1897 return &path->path[len-1];
1901 * Enlarge the type path by an (empty) element.
1903 static type_path_entry_t *append_to_type_path(type_path_t *path)
1905 size_t len = ARR_LEN(path->path);
1906 ARR_RESIZE(type_path_entry_t, path->path, len+1);
1908 type_path_entry_t *result = & path->path[len];
1909 memset(result, 0, sizeof(result[0]));
1914 * Descending into a sub-type. Enter the scope of the current
1917 static void descend_into_subtype(type_path_t *path)
1919 type_t *orig_top_type = path->top_type;
1920 type_t *top_type = skip_typeref(orig_top_type);
1922 assert(is_type_compound(top_type) || is_type_array(top_type));
1924 type_path_entry_t *top = append_to_type_path(path);
1925 top->type = top_type;
1927 if(is_type_compound(top_type)) {
1928 declaration_t *declaration = top_type->compound.declaration;
1929 declaration_t *entry = declaration->scope.declarations;
1930 top->v.compound_entry = entry;
1933 path->top_type = entry->type;
1935 path->top_type = NULL;
1938 assert(is_type_array(top_type));
1941 path->top_type = top_type->array.element_type;
1946 * Pop an entry from the given type path, ie. returning from
1947 * (type).a.b to (type).a
1949 static void ascend_from_subtype(type_path_t *path)
1951 type_path_entry_t *top = get_type_path_top(path);
1953 path->top_type = top->type;
1955 size_t len = ARR_LEN(path->path);
1956 ARR_RESIZE(type_path_entry_t, path->path, len-1);
1960 * Pop entries from the given type path until the given
1961 * path level is reached.
1963 static void ascend_to(type_path_t *path, size_t top_path_level)
1965 size_t len = ARR_LEN(path->path);
1967 while(len > top_path_level) {
1968 ascend_from_subtype(path);
1969 len = ARR_LEN(path->path);
1973 static bool walk_designator(type_path_t *path, const designator_t *designator,
1974 bool used_in_offsetof)
1976 for( ; designator != NULL; designator = designator->next) {
1977 type_path_entry_t *top = get_type_path_top(path);
1978 type_t *orig_type = top->type;
1980 type_t *type = skip_typeref(orig_type);
1982 if(designator->symbol != NULL) {
1983 symbol_t *symbol = designator->symbol;
1984 if(!is_type_compound(type)) {
1985 if(is_type_valid(type)) {
1986 errorf(&designator->source_position,
1987 "'.%Y' designator used for non-compound type '%T'",
1993 declaration_t *declaration = type->compound.declaration;
1994 declaration_t *iter = declaration->scope.declarations;
1995 for( ; iter != NULL; iter = iter->next) {
1996 if(iter->symbol == symbol) {
2001 errorf(&designator->source_position,
2002 "'%T' has no member named '%Y'", orig_type, symbol);
2005 if(used_in_offsetof) {
2006 type_t *real_type = skip_typeref(iter->type);
2007 if(real_type->kind == TYPE_BITFIELD) {
2008 errorf(&designator->source_position,
2009 "offsetof designator '%Y' may not specify bitfield",
2015 top->type = orig_type;
2016 top->v.compound_entry = iter;
2017 orig_type = iter->type;
2019 expression_t *array_index = designator->array_index;
2020 assert(designator->array_index != NULL);
2022 if(!is_type_array(type)) {
2023 if(is_type_valid(type)) {
2024 errorf(&designator->source_position,
2025 "[%E] designator used for non-array type '%T'",
2026 array_index, orig_type);
2030 if(!is_type_valid(array_index->base.type)) {
2034 long index = fold_constant(array_index);
2035 if(!used_in_offsetof) {
2037 errorf(&designator->source_position,
2038 "array index [%E] must be positive", array_index);
2041 if(type->array.size_constant == true) {
2042 long array_size = type->array.size;
2043 if(index >= array_size) {
2044 errorf(&designator->source_position,
2045 "designator [%E] (%d) exceeds array size %d",
2046 array_index, index, array_size);
2052 top->type = orig_type;
2053 top->v.index = (size_t) index;
2054 orig_type = type->array.element_type;
2056 path->top_type = orig_type;
2058 if(designator->next != NULL) {
2059 descend_into_subtype(path);
2068 static void advance_current_object(type_path_t *path, size_t top_path_level)
2070 type_path_entry_t *top = get_type_path_top(path);
2072 type_t *type = skip_typeref(top->type);
2073 if(is_type_union(type)) {
2074 /* in unions only the first element is initialized */
2075 top->v.compound_entry = NULL;
2076 } else if(is_type_struct(type)) {
2077 declaration_t *entry = top->v.compound_entry;
2079 entry = entry->next;
2080 top->v.compound_entry = entry;
2082 path->top_type = entry->type;
2086 assert(is_type_array(type));
2090 if(!type->array.size_constant || top->v.index < type->array.size) {
2095 /* we're past the last member of the current sub-aggregate, try if we
2096 * can ascend in the type hierarchy and continue with another subobject */
2097 size_t len = ARR_LEN(path->path);
2099 if(len > top_path_level) {
2100 ascend_from_subtype(path);
2101 advance_current_object(path, top_path_level);
2103 path->top_type = NULL;
2108 * skip until token is found.
2110 static void skip_until(int type) {
2111 while(token.type != type) {
2112 if(token.type == T_EOF)
2119 * skip any {...} blocks until a closing bracket is reached.
2121 static void skip_initializers(void)
2123 if(token.type == '{')
2126 while(token.type != '}') {
2127 if(token.type == T_EOF)
2129 if(token.type == '{') {
2137 static initializer_t *create_empty_initializer(void)
2139 static initializer_t empty_initializer
2140 = { .list = { { INITIALIZER_LIST }, 0 } };
2141 return &empty_initializer;
2145 * Parse a part of an initialiser for a struct or union,
2147 static initializer_t *parse_sub_initializer(type_path_t *path,
2148 type_t *outer_type, size_t top_path_level,
2149 parse_initializer_env_t *env)
2151 if(token.type == '}') {
2152 /* empty initializer */
2153 return create_empty_initializer();
2156 type_t *orig_type = path->top_type;
2157 type_t *type = NULL;
2159 if (orig_type == NULL) {
2160 /* We are initializing an empty compound. */
2162 type = skip_typeref(orig_type);
2164 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2165 * initializers in this case. */
2166 if(!is_type_valid(type)) {
2167 skip_initializers();
2168 return create_empty_initializer();
2172 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2175 designator_t *designator = NULL;
2176 if(token.type == '.' || token.type == '[') {
2177 designator = parse_designation();
2179 /* reset path to toplevel, evaluate designator from there */
2180 ascend_to(path, top_path_level);
2181 if(!walk_designator(path, designator, false)) {
2182 /* can't continue after designation error */
2186 initializer_t *designator_initializer
2187 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2188 designator_initializer->designator.designator = designator;
2189 ARR_APP1(initializer_t*, initializers, designator_initializer);
2194 if(token.type == '{') {
2195 if(type != NULL && is_type_scalar(type)) {
2196 sub = parse_scalar_initializer(type, env->must_be_constant);
2200 if (env->declaration != NULL)
2201 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2202 env->declaration->symbol);
2204 errorf(HERE, "extra brace group at end of initializer");
2206 descend_into_subtype(path);
2208 add_anchor_token('}');
2209 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2211 rem_anchor_token('}');
2214 ascend_from_subtype(path);
2218 goto error_parse_next;
2222 /* must be an expression */
2223 expression_t *expression = parse_assignment_expression();
2225 if(env->must_be_constant && !is_initializer_constant(expression)) {
2226 errorf(&expression->base.source_position,
2227 "Initialisation expression '%E' is not constant\n",
2232 /* we are already outside, ... */
2236 /* handle { "string" } special case */
2237 if((expression->kind == EXPR_STRING_LITERAL
2238 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2239 && outer_type != NULL) {
2240 sub = initializer_from_expression(outer_type, expression);
2242 if(token.type == ',') {
2245 if(token.type != '}') {
2246 warningf(HERE, "excessive elements in initializer for type '%T'",
2249 /* TODO: eat , ... */
2254 /* descend into subtypes until expression matches type */
2256 orig_type = path->top_type;
2257 type = skip_typeref(orig_type);
2259 sub = initializer_from_expression(orig_type, expression);
2263 if(!is_type_valid(type)) {
2266 if(is_type_scalar(type)) {
2267 errorf(&expression->base.source_position,
2268 "expression '%E' doesn't match expected type '%T'",
2269 expression, orig_type);
2273 descend_into_subtype(path);
2277 /* update largest index of top array */
2278 const type_path_entry_t *first = &path->path[0];
2279 type_t *first_type = first->type;
2280 first_type = skip_typeref(first_type);
2281 if(is_type_array(first_type)) {
2282 size_t index = first->v.index;
2283 if(index > path->max_index)
2284 path->max_index = index;
2288 /* append to initializers list */
2289 ARR_APP1(initializer_t*, initializers, sub);
2292 if(env->declaration != NULL)
2293 warningf(HERE, "excess elements in struct initializer for '%Y'",
2294 env->declaration->symbol);
2296 warningf(HERE, "excess elements in struct initializer");
2300 if(token.type == '}') {
2304 if(token.type == '}') {
2309 /* advance to the next declaration if we are not at the end */
2310 advance_current_object(path, top_path_level);
2311 orig_type = path->top_type;
2312 if(orig_type != NULL)
2313 type = skip_typeref(orig_type);
2319 size_t len = ARR_LEN(initializers);
2320 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2321 initializer_t *result = allocate_ast_zero(size);
2322 result->kind = INITIALIZER_LIST;
2323 result->list.len = len;
2324 memcpy(&result->list.initializers, initializers,
2325 len * sizeof(initializers[0]));
2327 DEL_ARR_F(initializers);
2328 ascend_to(path, top_path_level+1);
2333 skip_initializers();
2334 DEL_ARR_F(initializers);
2335 ascend_to(path, top_path_level+1);
2340 * Parses an initializer. Parsers either a compound literal
2341 * (env->declaration == NULL) or an initializer of a declaration.
2343 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2345 type_t *type = skip_typeref(env->type);
2346 initializer_t *result = NULL;
2349 if(is_type_scalar(type)) {
2350 result = parse_scalar_initializer(type, env->must_be_constant);
2351 } else if(token.type == '{') {
2355 memset(&path, 0, sizeof(path));
2356 path.top_type = env->type;
2357 path.path = NEW_ARR_F(type_path_entry_t, 0);
2359 descend_into_subtype(&path);
2361 add_anchor_token('}');
2362 result = parse_sub_initializer(&path, env->type, 1, env);
2363 rem_anchor_token('}');
2365 max_index = path.max_index;
2366 DEL_ARR_F(path.path);
2370 /* parse_scalar_initializer() also works in this case: we simply
2371 * have an expression without {} around it */
2372 result = parse_scalar_initializer(type, env->must_be_constant);
2375 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2376 * the array type size */
2377 if(is_type_array(type) && type->array.size_expression == NULL
2378 && result != NULL) {
2380 switch (result->kind) {
2381 case INITIALIZER_LIST:
2382 size = max_index + 1;
2385 case INITIALIZER_STRING:
2386 size = result->string.string.size;
2389 case INITIALIZER_WIDE_STRING:
2390 size = result->wide_string.string.size;
2394 internal_errorf(HERE, "invalid initializer type");
2397 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2398 cnst->base.type = type_size_t;
2399 cnst->conste.v.int_value = size;
2401 type_t *new_type = duplicate_type(type);
2403 new_type->array.size_expression = cnst;
2404 new_type->array.size_constant = true;
2405 new_type->array.size = size;
2406 env->type = new_type;
2414 static declaration_t *append_declaration(declaration_t *declaration);
2416 static declaration_t *parse_compound_type_specifier(bool is_struct)
2418 gnu_attribute_t *attributes = NULL;
2425 symbol_t *symbol = NULL;
2426 declaration_t *declaration = NULL;
2428 if (token.type == T___attribute__) {
2429 parse_attributes(&attributes);
2432 if(token.type == T_IDENTIFIER) {
2433 symbol = token.v.symbol;
2437 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
2439 declaration = get_declaration(symbol, NAMESPACE_UNION);
2441 } else if(token.type != '{') {
2443 parse_error_expected("while parsing struct type specifier",
2444 T_IDENTIFIER, '{', NULL);
2446 parse_error_expected("while parsing union type specifier",
2447 T_IDENTIFIER, '{', NULL);
2453 if(declaration == NULL) {
2454 declaration = allocate_declaration_zero();
2455 declaration->namespc =
2456 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2457 declaration->source_position = token.source_position;
2458 declaration->symbol = symbol;
2459 declaration->parent_scope = scope;
2460 if (symbol != NULL) {
2461 environment_push(declaration);
2463 append_declaration(declaration);
2466 if(token.type == '{') {
2467 if (declaration->init.complete) {
2468 assert(symbol != NULL);
2469 errorf(HERE, "multiple definitions of '%s %Y'",
2470 is_struct ? "struct" : "union", symbol);
2471 declaration->scope.declarations = NULL;
2473 declaration->init.complete = true;
2475 parse_compound_type_entries(declaration);
2476 parse_attributes(&attributes);
2482 static void parse_enum_entries(type_t *const enum_type)
2486 if(token.type == '}') {
2488 errorf(HERE, "empty enum not allowed");
2492 add_anchor_token('}');
2494 if(token.type != T_IDENTIFIER) {
2495 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2497 rem_anchor_token('}');
2501 declaration_t *const entry = allocate_declaration_zero();
2502 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2503 entry->type = enum_type;
2504 entry->symbol = token.v.symbol;
2505 entry->source_position = token.source_position;
2508 if(token.type == '=') {
2510 expression_t *value = parse_constant_expression();
2512 value = create_implicit_cast(value, enum_type);
2513 entry->init.enum_value = value;
2518 record_declaration(entry);
2520 if(token.type != ',')
2523 } while(token.type != '}');
2524 rem_anchor_token('}');
2532 static type_t *parse_enum_specifier(void)
2534 gnu_attribute_t *attributes = NULL;
2535 declaration_t *declaration;
2539 if(token.type == T_IDENTIFIER) {
2540 symbol = token.v.symbol;
2543 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2544 } else if(token.type != '{') {
2545 parse_error_expected("while parsing enum type specifier",
2546 T_IDENTIFIER, '{', NULL);
2553 if(declaration == NULL) {
2554 declaration = allocate_declaration_zero();
2555 declaration->namespc = NAMESPACE_ENUM;
2556 declaration->source_position = token.source_position;
2557 declaration->symbol = symbol;
2558 declaration->parent_scope = scope;
2561 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2562 type->enumt.declaration = declaration;
2564 if(token.type == '{') {
2565 if(declaration->init.complete) {
2566 errorf(HERE, "multiple definitions of enum %Y", symbol);
2568 if (symbol != NULL) {
2569 environment_push(declaration);
2571 append_declaration(declaration);
2572 declaration->init.complete = true;
2574 parse_enum_entries(type);
2575 parse_attributes(&attributes);
2582 * if a symbol is a typedef to another type, return true
2584 static bool is_typedef_symbol(symbol_t *symbol)
2586 const declaration_t *const declaration =
2587 get_declaration(symbol, NAMESPACE_NORMAL);
2589 declaration != NULL &&
2590 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2593 static type_t *parse_typeof(void)
2600 add_anchor_token(')');
2602 expression_t *expression = NULL;
2605 switch(token.type) {
2606 case T___extension__:
2607 /* this can be a prefix to a typename or an expression */
2608 /* we simply eat it now. */
2611 } while(token.type == T___extension__);
2615 if(is_typedef_symbol(token.v.symbol)) {
2616 type = parse_typename();
2618 expression = parse_expression();
2619 type = expression->base.type;
2624 type = parse_typename();
2628 expression = parse_expression();
2629 type = expression->base.type;
2633 rem_anchor_token(')');
2636 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2637 typeof_type->typeoft.expression = expression;
2638 typeof_type->typeoft.typeof_type = type;
2646 SPECIFIER_SIGNED = 1 << 0,
2647 SPECIFIER_UNSIGNED = 1 << 1,
2648 SPECIFIER_LONG = 1 << 2,
2649 SPECIFIER_INT = 1 << 3,
2650 SPECIFIER_DOUBLE = 1 << 4,
2651 SPECIFIER_CHAR = 1 << 5,
2652 SPECIFIER_SHORT = 1 << 6,
2653 SPECIFIER_LONG_LONG = 1 << 7,
2654 SPECIFIER_FLOAT = 1 << 8,
2655 SPECIFIER_BOOL = 1 << 9,
2656 SPECIFIER_VOID = 1 << 10,
2657 SPECIFIER_INT8 = 1 << 11,
2658 SPECIFIER_INT16 = 1 << 12,
2659 SPECIFIER_INT32 = 1 << 13,
2660 SPECIFIER_INT64 = 1 << 14,
2661 SPECIFIER_INT128 = 1 << 15,
2662 SPECIFIER_COMPLEX = 1 << 16,
2663 SPECIFIER_IMAGINARY = 1 << 17,
2666 static type_t *create_builtin_type(symbol_t *const symbol,
2667 type_t *const real_type)
2669 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2670 type->builtin.symbol = symbol;
2671 type->builtin.real_type = real_type;
2673 type_t *result = typehash_insert(type);
2674 if(type != result) {
2681 static type_t *get_typedef_type(symbol_t *symbol)
2683 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2684 if(declaration == NULL ||
2685 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2688 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2689 type->typedeft.declaration = declaration;
2695 * check for the allowed MS alignment values.
2697 static bool check_elignment_value(long long intvalue) {
2698 if(intvalue < 1 || intvalue > 8192) {
2699 errorf(HERE, "illegal alignment value");
2702 unsigned v = (unsigned)intvalue;
2703 for(unsigned i = 1; i <= 8192; i += i) {
2707 errorf(HERE, "alignment must be power of two");
2711 #define DET_MOD(name, tag) do { \
2712 if(*modifiers & tag) warningf(HERE, #name " used more than once"); \
2713 *modifiers |= tag; \
2716 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2718 decl_modifiers_t *modifiers = &specifiers->decl_modifiers;
2721 if(token.type == T_restrict) {
2723 DET_MOD(restrict, DM_RESTRICT);
2725 } else if(token.type != T_IDENTIFIER)
2727 symbol_t *symbol = token.v.symbol;
2728 if(symbol == sym_align) {
2731 if(token.type != T_INTEGER)
2733 if(check_elignment_value(token.v.intvalue)) {
2734 if(specifiers->alignment != 0)
2735 warningf(HERE, "align used more than once");
2736 specifiers->alignment = (unsigned char)token.v.intvalue;
2740 } else if(symbol == sym_allocate) {
2743 if(token.type != T_IDENTIFIER)
2745 (void)token.v.symbol;
2747 } else if(symbol == sym_dllimport) {
2749 DET_MOD(dllimport, DM_DLLIMPORT);
2750 } else if(symbol == sym_dllexport) {
2752 DET_MOD(dllexport, DM_DLLEXPORT);
2753 } else if(symbol == sym_thread) {
2755 DET_MOD(thread, DM_THREAD);
2756 } else if(symbol == sym_naked) {
2758 DET_MOD(naked, DM_NAKED);
2759 } else if(symbol == sym_noinline) {
2761 DET_MOD(noinline, DM_NOINLINE);
2762 } else if(symbol == sym_noreturn) {
2764 DET_MOD(noreturn, DM_NORETURN);
2765 } else if(symbol == sym_nothrow) {
2767 DET_MOD(nothrow, DM_NOTHROW);
2768 } else if(symbol == sym_novtable) {
2770 DET_MOD(novtable, DM_NOVTABLE);
2771 } else if(symbol == sym_property) {
2775 bool is_get = false;
2776 if(token.type != T_IDENTIFIER)
2778 if(token.v.symbol == sym_get) {
2780 } else if(token.v.symbol == sym_put) {
2782 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2787 if(token.type != T_IDENTIFIER)
2790 if(specifiers->get_property_sym != NULL) {
2791 errorf(HERE, "get property name already specified");
2793 specifiers->get_property_sym = token.v.symbol;
2796 if(specifiers->put_property_sym != NULL) {
2797 errorf(HERE, "put property name already specified");
2799 specifiers->put_property_sym = token.v.symbol;
2803 if(token.type == ',') {
2810 } else if(symbol == sym_selectany) {
2812 DET_MOD(selectany, DM_SELECTANY);
2813 } else if(symbol == sym_uuid) {
2816 if(token.type != T_STRING_LITERAL)
2820 } else if(symbol == sym_deprecated) {
2822 if(specifiers->deprecated != 0)
2823 warningf(HERE, "deprecated used more than once");
2824 specifiers->deprecated = 1;
2825 if(token.type == '(') {
2827 if(token.type == T_STRING_LITERAL) {
2828 specifiers->deprecated_string = token.v.string.begin;
2831 errorf(HERE, "string literal expected");
2835 } else if(symbol == sym_noalias) {
2837 DET_MOD(noalias, DM_NOALIAS);
2839 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
2841 if(token.type == '(')
2845 if (token.type == ',')
2852 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
2854 type_t *type = NULL;
2855 unsigned type_qualifiers = 0;
2856 unsigned type_specifiers = 0;
2859 specifiers->source_position = token.source_position;
2862 switch(token.type) {
2865 #define MATCH_STORAGE_CLASS(token, class) \
2867 if(specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
2868 errorf(HERE, "multiple storage classes in declaration specifiers"); \
2870 specifiers->declared_storage_class = class; \
2874 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
2875 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
2876 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
2877 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
2878 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
2883 add_anchor_token(')');
2884 parse_microsoft_extended_decl_modifier(specifiers);
2885 rem_anchor_token(')');
2890 switch (specifiers->declared_storage_class) {
2891 case STORAGE_CLASS_NONE:
2892 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
2895 case STORAGE_CLASS_EXTERN:
2896 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
2899 case STORAGE_CLASS_STATIC:
2900 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
2904 errorf(HERE, "multiple storage classes in declaration specifiers");
2910 /* type qualifiers */
2911 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
2913 type_qualifiers |= qualifier; \
2917 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
2918 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
2919 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
2920 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
2921 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
2922 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
2923 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
2924 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
2926 case T___extension__:
2931 /* type specifiers */
2932 #define MATCH_SPECIFIER(token, specifier, name) \
2935 if(type_specifiers & specifier) { \
2936 errorf(HERE, "multiple " name " type specifiers given"); \
2938 type_specifiers |= specifier; \
2942 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
2943 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
2944 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
2945 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
2946 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
2947 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
2948 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
2949 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
2950 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
2951 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8")
2952 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16")
2953 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32")
2954 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64")
2955 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128")
2956 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
2957 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
2959 case T__forceinline:
2960 /* only in microsoft mode */
2961 specifiers->decl_modifiers |= DM_FORCEINLINE;
2965 specifiers->is_inline = true;
2970 if(type_specifiers & SPECIFIER_LONG_LONG) {
2971 errorf(HERE, "multiple type specifiers given");
2972 } else if(type_specifiers & SPECIFIER_LONG) {
2973 type_specifiers |= SPECIFIER_LONG_LONG;
2975 type_specifiers |= SPECIFIER_LONG;
2980 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
2982 type->compound.declaration = parse_compound_type_specifier(true);
2986 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
2988 type->compound.declaration = parse_compound_type_specifier(false);
2992 type = parse_enum_specifier();
2995 type = parse_typeof();
2997 case T___builtin_va_list:
2998 type = duplicate_type(type_valist);
3002 case T___attribute__:
3003 parse_attributes(&specifiers->gnu_attributes);
3006 case T_IDENTIFIER: {
3007 /* only parse identifier if we haven't found a type yet */
3008 if(type != NULL || type_specifiers != 0)
3009 goto finish_specifiers;
3011 type_t *typedef_type = get_typedef_type(token.v.symbol);
3013 if(typedef_type == NULL)
3014 goto finish_specifiers;
3017 type = typedef_type;
3021 /* function specifier */
3023 goto finish_specifiers;
3030 atomic_type_kind_t atomic_type;
3032 /* match valid basic types */
3033 switch(type_specifiers) {
3034 case SPECIFIER_VOID:
3035 atomic_type = ATOMIC_TYPE_VOID;
3037 case SPECIFIER_CHAR:
3038 atomic_type = ATOMIC_TYPE_CHAR;
3040 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3041 atomic_type = ATOMIC_TYPE_SCHAR;
3043 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3044 atomic_type = ATOMIC_TYPE_UCHAR;
3046 case SPECIFIER_SHORT:
3047 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3048 case SPECIFIER_SHORT | SPECIFIER_INT:
3049 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3050 atomic_type = ATOMIC_TYPE_SHORT;
3052 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3053 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3054 atomic_type = ATOMIC_TYPE_USHORT;
3057 case SPECIFIER_SIGNED:
3058 case SPECIFIER_SIGNED | SPECIFIER_INT:
3059 atomic_type = ATOMIC_TYPE_INT;
3061 case SPECIFIER_UNSIGNED:
3062 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3063 atomic_type = ATOMIC_TYPE_UINT;
3065 case SPECIFIER_LONG:
3066 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3067 case SPECIFIER_LONG | SPECIFIER_INT:
3068 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3069 atomic_type = ATOMIC_TYPE_LONG;
3071 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3072 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3073 atomic_type = ATOMIC_TYPE_ULONG;
3075 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3076 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3077 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3078 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3080 atomic_type = ATOMIC_TYPE_LONGLONG;
3082 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3083 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3085 atomic_type = ATOMIC_TYPE_ULONGLONG;
3088 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3089 atomic_type = unsigned_int8_type_kind;
3092 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3093 atomic_type = unsigned_int16_type_kind;
3096 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3097 atomic_type = unsigned_int32_type_kind;
3100 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3101 atomic_type = unsigned_int64_type_kind;
3104 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3105 atomic_type = unsigned_int128_type_kind;
3108 case SPECIFIER_INT8:
3109 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3110 atomic_type = int8_type_kind;
3113 case SPECIFIER_INT16:
3114 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3115 atomic_type = int16_type_kind;
3118 case SPECIFIER_INT32:
3119 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3120 atomic_type = int32_type_kind;
3123 case SPECIFIER_INT64:
3124 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3125 atomic_type = int64_type_kind;
3128 case SPECIFIER_INT128:
3129 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3130 atomic_type = int128_type_kind;
3133 case SPECIFIER_FLOAT:
3134 atomic_type = ATOMIC_TYPE_FLOAT;
3136 case SPECIFIER_DOUBLE:
3137 atomic_type = ATOMIC_TYPE_DOUBLE;
3139 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3140 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3142 case SPECIFIER_BOOL:
3143 atomic_type = ATOMIC_TYPE_BOOL;
3145 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3146 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3147 atomic_type = ATOMIC_TYPE_FLOAT;
3149 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3150 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3151 atomic_type = ATOMIC_TYPE_DOUBLE;
3153 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3154 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3155 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3158 /* invalid specifier combination, give an error message */
3159 if(type_specifiers == 0) {
3160 if (! strict_mode) {
3161 if (warning.implicit_int) {
3162 warningf(HERE, "no type specifiers in declaration, using 'int'");
3164 atomic_type = ATOMIC_TYPE_INT;
3167 errorf(HERE, "no type specifiers given in declaration");
3169 } else if((type_specifiers & SPECIFIER_SIGNED) &&
3170 (type_specifiers & SPECIFIER_UNSIGNED)) {
3171 errorf(HERE, "signed and unsigned specifiers gives");
3172 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3173 errorf(HERE, "only integer types can be signed or unsigned");
3175 errorf(HERE, "multiple datatypes in declaration");
3177 atomic_type = ATOMIC_TYPE_INVALID;
3180 if(type_specifiers & SPECIFIER_COMPLEX &&
3181 atomic_type != ATOMIC_TYPE_INVALID) {
3182 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3183 type->complex.akind = atomic_type;
3184 } else if(type_specifiers & SPECIFIER_IMAGINARY &&
3185 atomic_type != ATOMIC_TYPE_INVALID) {
3186 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3187 type->imaginary.akind = atomic_type;
3189 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3190 type->atomic.akind = atomic_type;
3194 if(type_specifiers != 0) {
3195 errorf(HERE, "multiple datatypes in declaration");
3199 type->base.qualifiers = type_qualifiers;
3200 /* FIXME: check type qualifiers here */
3202 type_t *result = typehash_insert(type);
3203 if(newtype && result != type) {
3207 specifiers->type = result;
3212 static type_qualifiers_t parse_type_qualifiers(void)
3214 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
3217 switch(token.type) {
3218 /* type qualifiers */
3219 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3220 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3221 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3222 /* microsoft extended type modifiers */
3223 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3224 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3225 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3226 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3227 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3230 return type_qualifiers;
3235 static declaration_t *parse_identifier_list(void)
3237 declaration_t *declarations = NULL;
3238 declaration_t *last_declaration = NULL;
3240 declaration_t *const declaration = allocate_declaration_zero();
3241 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3242 declaration->source_position = token.source_position;
3243 declaration->symbol = token.v.symbol;
3246 if(last_declaration != NULL) {
3247 last_declaration->next = declaration;
3249 declarations = declaration;
3251 last_declaration = declaration;
3253 if (token.type != ',') {
3257 } while(token.type == T_IDENTIFIER);
3259 return declarations;
3262 static void semantic_parameter(declaration_t *declaration)
3264 /* TODO: improve error messages */
3266 if(declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3267 errorf(HERE, "typedef not allowed in parameter list");
3268 } else if(declaration->declared_storage_class != STORAGE_CLASS_NONE
3269 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3270 errorf(HERE, "parameter may only have none or register storage class");
3273 type_t *const orig_type = declaration->type;
3274 type_t * type = skip_typeref(orig_type);
3276 /* Array as last part of a parameter type is just syntactic sugar. Turn it
3277 * into a pointer. § 6.7.5.3 (7) */
3278 if (is_type_array(type)) {
3279 type_t *const element_type = type->array.element_type;
3281 type = make_pointer_type(element_type, type->base.qualifiers);
3283 declaration->type = type;
3286 if(is_type_incomplete(type)) {
3287 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3288 orig_type, declaration->symbol);
3292 static declaration_t *parse_parameter(void)
3294 declaration_specifiers_t specifiers;
3295 memset(&specifiers, 0, sizeof(specifiers));
3297 parse_declaration_specifiers(&specifiers);
3299 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3301 semantic_parameter(declaration);
3306 static declaration_t *parse_parameters(function_type_t *type)
3308 declaration_t *declarations = NULL;
3311 add_anchor_token(')');
3312 int saved_comma_state = save_and_reset_anchor_state(',');
3314 if(token.type == T_IDENTIFIER) {
3315 symbol_t *symbol = token.v.symbol;
3316 if(!is_typedef_symbol(symbol)) {
3317 type->kr_style_parameters = true;
3318 declarations = parse_identifier_list();
3319 goto parameters_finished;
3323 if(token.type == ')') {
3324 type->unspecified_parameters = 1;
3325 goto parameters_finished;
3327 if(token.type == T_void && look_ahead(1)->type == ')') {
3329 goto parameters_finished;
3332 declaration_t *declaration;
3333 declaration_t *last_declaration = NULL;
3334 function_parameter_t *parameter;
3335 function_parameter_t *last_parameter = NULL;
3338 switch(token.type) {
3342 goto parameters_finished;
3345 case T___extension__:
3347 declaration = parse_parameter();
3349 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3350 memset(parameter, 0, sizeof(parameter[0]));
3351 parameter->type = declaration->type;
3353 if(last_parameter != NULL) {
3354 last_declaration->next = declaration;
3355 last_parameter->next = parameter;
3357 type->parameters = parameter;
3358 declarations = declaration;
3360 last_parameter = parameter;
3361 last_declaration = declaration;
3365 goto parameters_finished;
3367 if (token.type != ',') {
3368 goto parameters_finished;
3374 parameters_finished:
3375 rem_anchor_token(')');
3378 restore_anchor_state(',', saved_comma_state);
3379 return declarations;
3382 restore_anchor_state(',', saved_comma_state);
3391 } construct_type_kind_t;
3393 typedef struct construct_type_t construct_type_t;
3394 struct construct_type_t {
3395 construct_type_kind_t kind;
3396 construct_type_t *next;
3399 typedef struct parsed_pointer_t parsed_pointer_t;
3400 struct parsed_pointer_t {
3401 construct_type_t construct_type;
3402 type_qualifiers_t type_qualifiers;
3405 typedef struct construct_function_type_t construct_function_type_t;
3406 struct construct_function_type_t {
3407 construct_type_t construct_type;
3408 type_t *function_type;
3411 typedef struct parsed_array_t parsed_array_t;
3412 struct parsed_array_t {
3413 construct_type_t construct_type;
3414 type_qualifiers_t type_qualifiers;
3420 typedef struct construct_base_type_t construct_base_type_t;
3421 struct construct_base_type_t {
3422 construct_type_t construct_type;
3426 static construct_type_t *parse_pointer_declarator(void)
3430 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3431 memset(pointer, 0, sizeof(pointer[0]));
3432 pointer->construct_type.kind = CONSTRUCT_POINTER;
3433 pointer->type_qualifiers = parse_type_qualifiers();
3435 return (construct_type_t*) pointer;
3438 static construct_type_t *parse_array_declarator(void)
3441 add_anchor_token(']');
3443 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3444 memset(array, 0, sizeof(array[0]));
3445 array->construct_type.kind = CONSTRUCT_ARRAY;
3447 if(token.type == T_static) {
3448 array->is_static = true;
3452 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3453 if(type_qualifiers != 0) {
3454 if(token.type == T_static) {
3455 array->is_static = true;
3459 array->type_qualifiers = type_qualifiers;
3461 if(token.type == '*' && look_ahead(1)->type == ']') {
3462 array->is_variable = true;
3464 } else if(token.type != ']') {
3465 array->size = parse_assignment_expression();
3468 rem_anchor_token(']');
3471 return (construct_type_t*) array;
3476 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3479 if(declaration != NULL) {
3480 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3482 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3485 declaration_t *parameters = parse_parameters(&type->function);
3486 if(declaration != NULL) {
3487 declaration->scope.declarations = parameters;
3490 construct_function_type_t *construct_function_type =
3491 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3492 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3493 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3494 construct_function_type->function_type = type;
3496 return (construct_type_t*) construct_function_type;
3499 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3500 bool may_be_abstract)
3502 /* construct a single linked list of construct_type_t's which describe
3503 * how to construct the final declarator type */
3504 construct_type_t *first = NULL;
3505 construct_type_t *last = NULL;
3506 gnu_attribute_t *attributes = NULL;
3509 while(token.type == '*') {
3510 construct_type_t *type = parse_pointer_declarator();
3521 /* TODO: find out if this is correct */
3522 parse_attributes(&attributes);
3524 construct_type_t *inner_types = NULL;
3526 switch(token.type) {
3528 if(declaration == NULL) {
3529 errorf(HERE, "no identifier expected in typename");
3531 declaration->symbol = token.v.symbol;
3532 declaration->source_position = token.source_position;
3538 add_anchor_token(')');
3539 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3540 rem_anchor_token(')');
3546 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3547 /* avoid a loop in the outermost scope, because eat_statement doesn't
3549 if(token.type == '}' && current_function == NULL) {
3557 construct_type_t *p = last;
3560 construct_type_t *type;
3561 switch(token.type) {
3563 type = parse_function_declarator(declaration);
3566 type = parse_array_declarator();
3569 goto declarator_finished;
3572 /* insert in the middle of the list (behind p) */
3574 type->next = p->next;
3585 declarator_finished:
3586 parse_attributes(&attributes);
3588 /* append inner_types at the end of the list, we don't to set last anymore
3589 * as it's not needed anymore */
3591 assert(first == NULL);
3592 first = inner_types;
3594 last->next = inner_types;
3602 static type_t *construct_declarator_type(construct_type_t *construct_list,
3605 construct_type_t *iter = construct_list;
3606 for( ; iter != NULL; iter = iter->next) {
3607 switch(iter->kind) {
3608 case CONSTRUCT_INVALID:
3609 internal_errorf(HERE, "invalid type construction found");
3610 case CONSTRUCT_FUNCTION: {
3611 construct_function_type_t *construct_function_type
3612 = (construct_function_type_t*) iter;
3614 type_t *function_type = construct_function_type->function_type;
3616 function_type->function.return_type = type;
3618 type_t *skipped_return_type = skip_typeref(type);
3619 if (is_type_function(skipped_return_type)) {
3620 errorf(HERE, "function returning function is not allowed");
3621 type = type_error_type;
3622 } else if (is_type_array(skipped_return_type)) {
3623 errorf(HERE, "function returning array is not allowed");
3624 type = type_error_type;
3626 type = function_type;
3631 case CONSTRUCT_POINTER: {
3632 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3633 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3634 pointer_type->pointer.points_to = type;
3635 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3637 type = pointer_type;
3641 case CONSTRUCT_ARRAY: {
3642 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3643 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3645 expression_t *size_expression = parsed_array->size;
3646 if(size_expression != NULL) {
3648 = create_implicit_cast(size_expression, type_size_t);
3651 array_type->base.qualifiers = parsed_array->type_qualifiers;
3652 array_type->array.element_type = type;
3653 array_type->array.is_static = parsed_array->is_static;
3654 array_type->array.is_variable = parsed_array->is_variable;
3655 array_type->array.size_expression = size_expression;
3657 if(size_expression != NULL) {
3658 if(is_constant_expression(size_expression)) {
3659 array_type->array.size_constant = true;
3660 array_type->array.size
3661 = fold_constant(size_expression);
3663 array_type->array.is_vla = true;
3667 type_t *skipped_type = skip_typeref(type);
3668 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3669 errorf(HERE, "array of void is not allowed");
3670 type = type_error_type;
3678 type_t *hashed_type = typehash_insert(type);
3679 if(hashed_type != type) {
3680 /* the function type was constructed earlier freeing it here will
3681 * destroy other types... */
3682 if(iter->kind != CONSTRUCT_FUNCTION) {
3692 static declaration_t *parse_declarator(
3693 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3695 declaration_t *const declaration = allocate_declaration_zero();
3696 declaration->declared_storage_class = specifiers->declared_storage_class;
3697 declaration->decl_modifiers = specifiers->decl_modifiers;
3698 declaration->deprecated = specifiers->deprecated;
3699 declaration->deprecated_string = specifiers->deprecated_string;
3700 declaration->get_property_sym = specifiers->get_property_sym;
3701 declaration->put_property_sym = specifiers->put_property_sym;
3702 declaration->is_inline = specifiers->is_inline;
3704 declaration->storage_class = specifiers->declared_storage_class;
3705 if(declaration->storage_class == STORAGE_CLASS_NONE
3706 && scope != global_scope) {
3707 declaration->storage_class = STORAGE_CLASS_AUTO;
3710 if(specifiers->alignment != 0) {
3711 /* TODO: add checks here */
3712 declaration->alignment = specifiers->alignment;
3715 construct_type_t *construct_type
3716 = parse_inner_declarator(declaration, may_be_abstract);
3717 type_t *const type = specifiers->type;
3718 declaration->type = construct_declarator_type(construct_type, type);
3720 if(construct_type != NULL) {
3721 obstack_free(&temp_obst, construct_type);
3727 static type_t *parse_abstract_declarator(type_t *base_type)
3729 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
3731 type_t *result = construct_declarator_type(construct_type, base_type);
3732 if(construct_type != NULL) {
3733 obstack_free(&temp_obst, construct_type);
3739 static declaration_t *append_declaration(declaration_t* const declaration)
3741 if (last_declaration != NULL) {
3742 last_declaration->next = declaration;
3744 scope->declarations = declaration;
3746 last_declaration = declaration;
3751 * Check if the declaration of main is suspicious. main should be a
3752 * function with external linkage, returning int, taking either zero
3753 * arguments, two, or three arguments of appropriate types, ie.
3755 * int main([ int argc, char **argv [, char **env ] ]).
3757 * @param decl the declaration to check
3758 * @param type the function type of the declaration
3760 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
3762 if (decl->storage_class == STORAGE_CLASS_STATIC) {
3763 warningf(&decl->source_position,
3764 "'main' is normally a non-static function");
3766 if (skip_typeref(func_type->return_type) != type_int) {
3767 warningf(&decl->source_position,
3768 "return type of 'main' should be 'int', but is '%T'",
3769 func_type->return_type);
3771 const function_parameter_t *parm = func_type->parameters;
3773 type_t *const first_type = parm->type;
3774 if (!types_compatible(skip_typeref(first_type), type_int)) {
3775 warningf(&decl->source_position,
3776 "first argument of 'main' should be 'int', but is '%T'", first_type);
3780 type_t *const second_type = parm->type;
3781 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
3782 warningf(&decl->source_position,
3783 "second argument of 'main' should be 'char**', but is '%T'", second_type);
3787 type_t *const third_type = parm->type;
3788 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
3789 warningf(&decl->source_position,
3790 "third argument of 'main' should be 'char**', but is '%T'", third_type);
3794 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3798 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3804 * Check if a symbol is the equal to "main".
3806 static bool is_sym_main(const symbol_t *const sym)
3808 return strcmp(sym->string, "main") == 0;
3811 static declaration_t *internal_record_declaration(
3812 declaration_t *const declaration,
3813 const bool is_function_definition)
3815 const symbol_t *const symbol = declaration->symbol;
3816 const namespace_t namespc = (namespace_t)declaration->namespc;
3818 assert(declaration->symbol != NULL);
3819 declaration_t *previous_declaration = get_declaration(symbol, namespc);
3821 type_t *const orig_type = declaration->type;
3822 type_t *const type = skip_typeref(orig_type);
3823 if (is_type_function(type) &&
3824 type->function.unspecified_parameters &&
3825 warning.strict_prototypes &&
3826 previous_declaration == NULL) {
3827 warningf(&declaration->source_position,
3828 "function declaration '%#T' is not a prototype",
3829 orig_type, declaration->symbol);
3832 if (is_function_definition && warning.main && is_sym_main(symbol)) {
3833 check_type_of_main(declaration, &type->function);
3836 assert(declaration != previous_declaration);
3837 if (previous_declaration != NULL
3838 && previous_declaration->parent_scope == scope) {
3839 /* can happen for K&R style declarations */
3840 if (previous_declaration->type == NULL) {
3841 previous_declaration->type = declaration->type;
3844 const type_t *prev_type = skip_typeref(previous_declaration->type);
3845 if (!types_compatible(type, prev_type)) {
3846 errorf(&declaration->source_position,
3847 "declaration '%#T' is incompatible with '%#T' (declared %P)",
3848 orig_type, symbol, previous_declaration->type, symbol,
3849 &previous_declaration->source_position);
3851 unsigned old_storage_class = previous_declaration->storage_class;
3852 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
3853 errorf(&declaration->source_position,
3854 "redeclaration of enum entry '%Y' (declared %P)",
3855 symbol, &previous_declaration->source_position);
3856 return previous_declaration;
3859 unsigned new_storage_class = declaration->storage_class;
3861 if (is_type_incomplete(prev_type)) {
3862 previous_declaration->type = type;
3866 /* pretend no storage class means extern for function
3867 * declarations (except if the previous declaration is neither
3868 * none nor extern) */
3869 if (is_type_function(type)) {
3870 if (prev_type->function.unspecified_parameters) {
3871 previous_declaration->type = type;
3875 switch (old_storage_class) {
3876 case STORAGE_CLASS_NONE:
3877 old_storage_class = STORAGE_CLASS_EXTERN;
3879 case STORAGE_CLASS_EXTERN:
3880 if (is_function_definition) {
3881 if (warning.missing_prototypes &&
3882 prev_type->function.unspecified_parameters &&
3883 !is_sym_main(symbol)) {
3884 warningf(&declaration->source_position,
3885 "no previous prototype for '%#T'",
3888 } else if (new_storage_class == STORAGE_CLASS_NONE) {
3889 new_storage_class = STORAGE_CLASS_EXTERN;
3898 if (old_storage_class == STORAGE_CLASS_EXTERN &&
3899 new_storage_class == STORAGE_CLASS_EXTERN) {
3900 warn_redundant_declaration:
3901 if (warning.redundant_decls) {
3902 warningf(&declaration->source_position,
3903 "redundant declaration for '%Y' (declared %P)",
3904 symbol, &previous_declaration->source_position);
3906 } else if (current_function == NULL) {
3907 if (old_storage_class != STORAGE_CLASS_STATIC &&
3908 new_storage_class == STORAGE_CLASS_STATIC) {
3909 errorf(&declaration->source_position,
3910 "static declaration of '%Y' follows non-static declaration (declared %P)",
3911 symbol, &previous_declaration->source_position);
3912 } else if (old_storage_class != STORAGE_CLASS_EXTERN
3913 && !is_function_definition) {
3914 goto warn_redundant_declaration;
3915 } else if (new_storage_class == STORAGE_CLASS_NONE) {
3916 previous_declaration->storage_class = STORAGE_CLASS_NONE;
3917 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
3919 } else if (old_storage_class == new_storage_class) {
3920 errorf(&declaration->source_position,
3921 "redeclaration of '%Y' (declared %P)",
3922 symbol, &previous_declaration->source_position);
3924 errorf(&declaration->source_position,
3925 "redeclaration of '%Y' with different linkage (declared %P)",
3926 symbol, &previous_declaration->source_position);
3930 if (declaration->is_inline)
3931 previous_declaration->is_inline = true;
3932 return previous_declaration;
3933 } else if (is_function_definition) {
3934 if (declaration->storage_class != STORAGE_CLASS_STATIC) {
3935 if (warning.missing_prototypes && !is_sym_main(symbol)) {
3936 warningf(&declaration->source_position,
3937 "no previous prototype for '%#T'", orig_type, symbol);
3938 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
3939 warningf(&declaration->source_position,
3940 "no previous declaration for '%#T'", orig_type,
3944 } else if (warning.missing_declarations &&
3945 scope == global_scope &&
3946 !is_type_function(type) && (
3947 declaration->storage_class == STORAGE_CLASS_NONE ||
3948 declaration->storage_class == STORAGE_CLASS_THREAD
3950 warningf(&declaration->source_position,
3951 "no previous declaration for '%#T'", orig_type, symbol);
3954 assert(declaration->parent_scope == NULL);
3955 assert(scope != NULL);
3957 declaration->parent_scope = scope;
3959 environment_push(declaration);
3960 return append_declaration(declaration);
3963 static declaration_t *record_declaration(declaration_t *declaration)
3965 return internal_record_declaration(declaration, false);
3968 static declaration_t *record_function_definition(declaration_t *declaration)
3970 return internal_record_declaration(declaration, true);
3973 static void parser_error_multiple_definition(declaration_t *declaration,
3974 const source_position_t *source_position)
3976 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
3977 declaration->symbol, &declaration->source_position);
3980 static bool is_declaration_specifier(const token_t *token,
3981 bool only_specifiers_qualifiers)
3983 switch(token->type) {
3988 return is_typedef_symbol(token->v.symbol);
3990 case T___extension__:
3992 return !only_specifiers_qualifiers;
3999 static void parse_init_declarator_rest(declaration_t *declaration)
4003 type_t *orig_type = declaration->type;
4004 type_t *type = skip_typeref(orig_type);
4006 if(declaration->init.initializer != NULL) {
4007 parser_error_multiple_definition(declaration, HERE);
4010 bool must_be_constant = false;
4011 if(declaration->storage_class == STORAGE_CLASS_STATIC
4012 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4013 || declaration->parent_scope == global_scope) {
4014 must_be_constant = true;
4017 parse_initializer_env_t env;
4018 env.type = orig_type;
4019 env.must_be_constant = must_be_constant;
4020 env.declaration = declaration;
4022 initializer_t *initializer = parse_initializer(&env);
4024 if(env.type != orig_type) {
4025 orig_type = env.type;
4026 type = skip_typeref(orig_type);
4027 declaration->type = env.type;
4030 if(is_type_function(type)) {
4031 errorf(&declaration->source_position,
4032 "initializers not allowed for function types at declator '%Y' (type '%T')",
4033 declaration->symbol, orig_type);
4035 declaration->init.initializer = initializer;
4039 /* parse rest of a declaration without any declarator */
4040 static void parse_anonymous_declaration_rest(
4041 const declaration_specifiers_t *specifiers,
4042 parsed_declaration_func finished_declaration)
4046 declaration_t *const declaration = allocate_declaration_zero();
4047 declaration->type = specifiers->type;
4048 declaration->declared_storage_class = specifiers->declared_storage_class;
4049 declaration->source_position = specifiers->source_position;
4050 declaration->decl_modifiers = specifiers->decl_modifiers;
4052 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4053 warningf(&declaration->source_position,
4054 "useless storage class in empty declaration");
4056 declaration->storage_class = STORAGE_CLASS_NONE;
4058 type_t *type = declaration->type;
4059 switch (type->kind) {
4060 case TYPE_COMPOUND_STRUCT:
4061 case TYPE_COMPOUND_UNION: {
4062 if (type->compound.declaration->symbol == NULL) {
4063 warningf(&declaration->source_position,
4064 "unnamed struct/union that defines no instances");
4073 warningf(&declaration->source_position, "empty declaration");
4077 finished_declaration(declaration);
4080 static void parse_declaration_rest(declaration_t *ndeclaration,
4081 const declaration_specifiers_t *specifiers,
4082 parsed_declaration_func finished_declaration)
4084 add_anchor_token(';');
4085 add_anchor_token('=');
4086 add_anchor_token(',');
4088 declaration_t *declaration = finished_declaration(ndeclaration);
4090 type_t *orig_type = declaration->type;
4091 type_t *type = skip_typeref(orig_type);
4093 if (type->kind != TYPE_FUNCTION &&
4094 declaration->is_inline &&
4095 is_type_valid(type)) {
4096 warningf(&declaration->source_position,
4097 "variable '%Y' declared 'inline'\n", declaration->symbol);
4100 if(token.type == '=') {
4101 parse_init_declarator_rest(declaration);
4104 if(token.type != ',')
4108 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4113 rem_anchor_token(';');
4114 rem_anchor_token('=');
4115 rem_anchor_token(',');
4118 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4120 symbol_t *symbol = declaration->symbol;
4121 if(symbol == NULL) {
4122 errorf(HERE, "anonymous declaration not valid as function parameter");
4125 namespace_t namespc = (namespace_t) declaration->namespc;
4126 if(namespc != NAMESPACE_NORMAL) {
4127 return record_declaration(declaration);
4130 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4131 if(previous_declaration == NULL ||
4132 previous_declaration->parent_scope != scope) {
4133 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4138 if(previous_declaration->type == NULL) {
4139 previous_declaration->type = declaration->type;
4140 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4141 previous_declaration->storage_class = declaration->storage_class;
4142 previous_declaration->parent_scope = scope;
4143 return previous_declaration;
4145 return record_declaration(declaration);
4149 static void parse_declaration(parsed_declaration_func finished_declaration)
4151 declaration_specifiers_t specifiers;
4152 memset(&specifiers, 0, sizeof(specifiers));
4153 parse_declaration_specifiers(&specifiers);
4155 if(token.type == ';') {
4156 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4158 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4159 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4163 static type_t *get_default_promoted_type(type_t *orig_type)
4165 type_t *result = orig_type;
4167 type_t *type = skip_typeref(orig_type);
4168 if(is_type_integer(type)) {
4169 result = promote_integer(type);
4170 } else if(type == type_float) {
4171 result = type_double;
4177 static void parse_kr_declaration_list(declaration_t *declaration)
4179 type_t *type = skip_typeref(declaration->type);
4180 if (!is_type_function(type))
4183 if (!type->function.kr_style_parameters)
4186 /* push function parameters */
4187 int top = environment_top();
4188 scope_t *last_scope = scope;
4189 set_scope(&declaration->scope);
4191 declaration_t *parameter = declaration->scope.declarations;
4192 for ( ; parameter != NULL; parameter = parameter->next) {
4193 assert(parameter->parent_scope == NULL);
4194 parameter->parent_scope = scope;
4195 environment_push(parameter);
4198 /* parse declaration list */
4199 while (is_declaration_specifier(&token, false)) {
4200 parse_declaration(finished_kr_declaration);
4203 /* pop function parameters */
4204 assert(scope == &declaration->scope);
4205 set_scope(last_scope);
4206 environment_pop_to(top);
4208 /* update function type */
4209 type_t *new_type = duplicate_type(type);
4211 function_parameter_t *parameters = NULL;
4212 function_parameter_t *last_parameter = NULL;
4214 declaration_t *parameter_declaration = declaration->scope.declarations;
4215 for( ; parameter_declaration != NULL;
4216 parameter_declaration = parameter_declaration->next) {
4217 type_t *parameter_type = parameter_declaration->type;
4218 if(parameter_type == NULL) {
4220 errorf(HERE, "no type specified for function parameter '%Y'",
4221 parameter_declaration->symbol);
4223 if (warning.implicit_int) {
4224 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4225 parameter_declaration->symbol);
4227 parameter_type = type_int;
4228 parameter_declaration->type = parameter_type;
4232 semantic_parameter(parameter_declaration);
4233 parameter_type = parameter_declaration->type;
4236 * we need the default promoted types for the function type
4238 parameter_type = get_default_promoted_type(parameter_type);
4240 function_parameter_t *function_parameter
4241 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4242 memset(function_parameter, 0, sizeof(function_parameter[0]));
4244 function_parameter->type = parameter_type;
4245 if(last_parameter != NULL) {
4246 last_parameter->next = function_parameter;
4248 parameters = function_parameter;
4250 last_parameter = function_parameter;
4253 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4255 new_type->function.parameters = parameters;
4256 new_type->function.unspecified_parameters = true;
4258 type = typehash_insert(new_type);
4259 if(type != new_type) {
4260 obstack_free(type_obst, new_type);
4263 declaration->type = type;
4266 static bool first_err = true;
4269 * When called with first_err set, prints the name of the current function,
4272 static void print_in_function(void) {
4275 diagnosticf("%s: In function '%Y':\n",
4276 current_function->source_position.input_name,
4277 current_function->symbol);
4282 * Check if all labels are defined in the current function.
4283 * Check if all labels are used in the current function.
4285 static void check_labels(void)
4287 for (const goto_statement_t *goto_statement = goto_first;
4288 goto_statement != NULL;
4289 goto_statement = goto_statement->next) {
4290 declaration_t *label = goto_statement->label;
4293 if (label->source_position.input_name == NULL) {
4294 print_in_function();
4295 errorf(&goto_statement->base.source_position,
4296 "label '%Y' used but not defined", label->symbol);
4299 goto_first = goto_last = NULL;
4301 if (warning.unused_label) {
4302 for (const label_statement_t *label_statement = label_first;
4303 label_statement != NULL;
4304 label_statement = label_statement->next) {
4305 const declaration_t *label = label_statement->label;
4307 if (! label->used) {
4308 print_in_function();
4309 warningf(&label_statement->base.source_position,
4310 "label '%Y' defined but not used", label->symbol);
4314 label_first = label_last = NULL;
4318 * Check declarations of current_function for unused entities.
4320 static void check_declarations(void)
4322 if (warning.unused_parameter) {
4323 const scope_t *scope = ¤t_function->scope;
4325 const declaration_t *parameter = scope->declarations;
4326 for (; parameter != NULL; parameter = parameter->next) {
4327 if (! parameter->used) {
4328 print_in_function();
4329 warningf(¶meter->source_position,
4330 "unused parameter '%Y'", parameter->symbol);
4334 if (warning.unused_variable) {
4338 static void parse_external_declaration(void)
4340 /* function-definitions and declarations both start with declaration
4342 declaration_specifiers_t specifiers;
4343 memset(&specifiers, 0, sizeof(specifiers));
4345 add_anchor_token(';');
4346 parse_declaration_specifiers(&specifiers);
4347 rem_anchor_token(';');
4349 /* must be a declaration */
4350 if(token.type == ';') {
4351 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4355 add_anchor_token(',');
4356 add_anchor_token('=');
4357 rem_anchor_token(';');
4359 /* declarator is common to both function-definitions and declarations */
4360 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4362 rem_anchor_token(',');
4363 rem_anchor_token('=');
4364 rem_anchor_token(';');
4366 /* must be a declaration */
4367 if(token.type == ',' || token.type == '=' || token.type == ';') {
4368 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4372 /* must be a function definition */
4373 parse_kr_declaration_list(ndeclaration);
4375 if(token.type != '{') {
4376 parse_error_expected("while parsing function definition", '{', NULL);
4377 eat_until_matching_token(';');
4381 type_t *type = ndeclaration->type;
4383 /* note that we don't skip typerefs: the standard doesn't allow them here
4384 * (so we can't use is_type_function here) */
4385 if(type->kind != TYPE_FUNCTION) {
4386 if (is_type_valid(type)) {
4387 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4388 type, ndeclaration->symbol);
4394 /* § 6.7.5.3 (14) a function definition with () means no
4395 * parameters (and not unspecified parameters) */
4396 if(type->function.unspecified_parameters
4397 && type->function.parameters == NULL
4398 && !type->function.kr_style_parameters) {
4399 type_t *duplicate = duplicate_type(type);
4400 duplicate->function.unspecified_parameters = false;
4402 type = typehash_insert(duplicate);
4403 if(type != duplicate) {
4404 obstack_free(type_obst, duplicate);
4406 ndeclaration->type = type;
4409 declaration_t *const declaration = record_function_definition(ndeclaration);
4410 if(ndeclaration != declaration) {
4411 declaration->scope = ndeclaration->scope;
4413 type = skip_typeref(declaration->type);
4415 /* push function parameters and switch scope */
4416 int top = environment_top();
4417 scope_t *last_scope = scope;
4418 set_scope(&declaration->scope);
4420 declaration_t *parameter = declaration->scope.declarations;
4421 for( ; parameter != NULL; parameter = parameter->next) {
4422 if(parameter->parent_scope == &ndeclaration->scope) {
4423 parameter->parent_scope = scope;
4425 assert(parameter->parent_scope == NULL
4426 || parameter->parent_scope == scope);
4427 parameter->parent_scope = scope;
4428 environment_push(parameter);
4431 if(declaration->init.statement != NULL) {
4432 parser_error_multiple_definition(declaration, HERE);
4434 goto end_of_parse_external_declaration;
4436 /* parse function body */
4437 int label_stack_top = label_top();
4438 declaration_t *old_current_function = current_function;
4439 current_function = declaration;
4441 declaration->init.statement = parse_compound_statement(false);
4444 check_declarations();
4446 assert(current_function == declaration);
4447 current_function = old_current_function;
4448 label_pop_to(label_stack_top);
4451 end_of_parse_external_declaration:
4452 assert(scope == &declaration->scope);
4453 set_scope(last_scope);
4454 environment_pop_to(top);
4457 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4458 source_position_t *source_position)
4460 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4462 type->bitfield.base_type = base_type;
4463 type->bitfield.size = size;
4468 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4471 declaration_t *iter = compound_declaration->scope.declarations;
4472 for( ; iter != NULL; iter = iter->next) {
4473 if(iter->namespc != NAMESPACE_NORMAL)
4476 if(iter->symbol == NULL) {
4477 type_t *type = skip_typeref(iter->type);
4478 if(is_type_compound(type)) {
4479 declaration_t *result
4480 = find_compound_entry(type->compound.declaration, symbol);
4487 if(iter->symbol == symbol) {
4495 static void parse_compound_declarators(declaration_t *struct_declaration,
4496 const declaration_specifiers_t *specifiers)
4498 declaration_t *last_declaration = struct_declaration->scope.declarations;
4499 if(last_declaration != NULL) {
4500 while(last_declaration->next != NULL) {
4501 last_declaration = last_declaration->next;
4506 declaration_t *declaration;
4508 if(token.type == ':') {
4509 source_position_t source_position = *HERE;
4512 type_t *base_type = specifiers->type;
4513 expression_t *size = parse_constant_expression();
4515 if(!is_type_integer(skip_typeref(base_type))) {
4516 errorf(HERE, "bitfield base type '%T' is not an integer type",
4520 type_t *type = make_bitfield_type(base_type, size, &source_position);
4522 declaration = allocate_declaration_zero();
4523 declaration->namespc = NAMESPACE_NORMAL;
4524 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4525 declaration->storage_class = STORAGE_CLASS_NONE;
4526 declaration->source_position = source_position;
4527 declaration->decl_modifiers = specifiers->decl_modifiers;
4528 declaration->type = type;
4530 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4532 type_t *orig_type = declaration->type;
4533 type_t *type = skip_typeref(orig_type);
4535 if(token.type == ':') {
4536 source_position_t source_position = *HERE;
4538 expression_t *size = parse_constant_expression();
4540 if(!is_type_integer(type)) {
4541 errorf(HERE, "bitfield base type '%T' is not an "
4542 "integer type", orig_type);
4545 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4546 declaration->type = bitfield_type;
4548 /* TODO we ignore arrays for now... what is missing is a check
4549 * that they're at the end of the struct */
4550 if(is_type_incomplete(type) && !is_type_array(type)) {
4552 "compound member '%Y' has incomplete type '%T'",
4553 declaration->symbol, orig_type);
4554 } else if(is_type_function(type)) {
4555 errorf(HERE, "compound member '%Y' must not have function "
4556 "type '%T'", declaration->symbol, orig_type);
4561 /* make sure we don't define a symbol multiple times */
4562 symbol_t *symbol = declaration->symbol;
4563 if(symbol != NULL) {
4564 declaration_t *prev_decl
4565 = find_compound_entry(struct_declaration, symbol);
4567 if(prev_decl != NULL) {
4568 assert(prev_decl->symbol == symbol);
4569 errorf(&declaration->source_position,
4570 "multiple declarations of symbol '%Y' (declared %P)",
4571 symbol, &prev_decl->source_position);
4575 /* append declaration */
4576 if(last_declaration != NULL) {
4577 last_declaration->next = declaration;
4579 struct_declaration->scope.declarations = declaration;
4581 last_declaration = declaration;
4583 if(token.type != ',')
4593 static void parse_compound_type_entries(declaration_t *compound_declaration)
4596 add_anchor_token('}');
4598 while(token.type != '}' && token.type != T_EOF) {
4599 declaration_specifiers_t specifiers;
4600 memset(&specifiers, 0, sizeof(specifiers));
4601 parse_declaration_specifiers(&specifiers);
4603 parse_compound_declarators(compound_declaration, &specifiers);
4605 rem_anchor_token('}');
4607 if(token.type == T_EOF) {
4608 errorf(HERE, "EOF while parsing struct");
4613 static type_t *parse_typename(void)
4615 declaration_specifiers_t specifiers;
4616 memset(&specifiers, 0, sizeof(specifiers));
4617 parse_declaration_specifiers(&specifiers);
4618 if(specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4619 /* TODO: improve error message, user does probably not know what a
4620 * storage class is...
4622 errorf(HERE, "typename may not have a storage class");
4625 type_t *result = parse_abstract_declarator(specifiers.type);
4633 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4634 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4635 expression_t *left);
4637 typedef struct expression_parser_function_t expression_parser_function_t;
4638 struct expression_parser_function_t {
4639 unsigned precedence;
4640 parse_expression_function parser;
4641 unsigned infix_precedence;
4642 parse_expression_infix_function infix_parser;
4645 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4648 * Prints an error message if an expression was expected but not read
4650 static expression_t *expected_expression_error(void)
4652 /* skip the error message if the error token was read */
4653 if (token.type != T_ERROR) {
4654 errorf(HERE, "expected expression, got token '%K'", &token);
4658 return create_invalid_expression();
4662 * Parse a string constant.
4664 static expression_t *parse_string_const(void)
4667 if (token.type == T_STRING_LITERAL) {
4668 string_t res = token.v.string;
4670 while (token.type == T_STRING_LITERAL) {
4671 res = concat_strings(&res, &token.v.string);
4674 if (token.type != T_WIDE_STRING_LITERAL) {
4675 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4676 /* note: that we use type_char_ptr here, which is already the
4677 * automatic converted type. revert_automatic_type_conversion
4678 * will construct the array type */
4679 cnst->base.type = type_char_ptr;
4680 cnst->string.value = res;
4684 wres = concat_string_wide_string(&res, &token.v.wide_string);
4686 wres = token.v.wide_string;
4691 switch (token.type) {
4692 case T_WIDE_STRING_LITERAL:
4693 wres = concat_wide_strings(&wres, &token.v.wide_string);
4696 case T_STRING_LITERAL:
4697 wres = concat_wide_string_string(&wres, &token.v.string);
4701 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
4702 cnst->base.type = type_wchar_t_ptr;
4703 cnst->wide_string.value = wres;
4712 * Parse an integer constant.
4714 static expression_t *parse_int_const(void)
4716 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4717 cnst->base.source_position = *HERE;
4718 cnst->base.type = token.datatype;
4719 cnst->conste.v.int_value = token.v.intvalue;
4727 * Parse a character constant.
4729 static expression_t *parse_character_constant(void)
4731 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
4733 cnst->base.source_position = *HERE;
4734 cnst->base.type = token.datatype;
4735 cnst->conste.v.character = token.v.string;
4737 if (cnst->conste.v.character.size != 1) {
4738 if (warning.multichar && (c_mode & _GNUC)) {
4740 warningf(HERE, "multi-character character constant");
4742 errorf(HERE, "more than 1 characters in character constant");
4751 * Parse a wide character constant.
4753 static expression_t *parse_wide_character_constant(void)
4755 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
4757 cnst->base.source_position = *HERE;
4758 cnst->base.type = token.datatype;
4759 cnst->conste.v.wide_character = token.v.wide_string;
4761 if (cnst->conste.v.wide_character.size != 1) {
4762 if (warning.multichar && (c_mode & _GNUC)) {
4764 warningf(HERE, "multi-character character constant");
4766 errorf(HERE, "more than 1 characters in character constant");
4775 * Parse a float constant.
4777 static expression_t *parse_float_const(void)
4779 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4780 cnst->base.type = token.datatype;
4781 cnst->conste.v.float_value = token.v.floatvalue;
4788 static declaration_t *create_implicit_function(symbol_t *symbol,
4789 const source_position_t *source_position)
4791 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
4792 ntype->function.return_type = type_int;
4793 ntype->function.unspecified_parameters = true;
4795 type_t *type = typehash_insert(ntype);
4800 declaration_t *const declaration = allocate_declaration_zero();
4801 declaration->storage_class = STORAGE_CLASS_EXTERN;
4802 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
4803 declaration->type = type;
4804 declaration->symbol = symbol;
4805 declaration->source_position = *source_position;
4807 bool strict_prototypes_old = warning.strict_prototypes;
4808 warning.strict_prototypes = false;
4809 record_declaration(declaration);
4810 warning.strict_prototypes = strict_prototypes_old;
4816 * Creates a return_type (func)(argument_type) function type if not
4819 * @param return_type the return type
4820 * @param argument_type the argument type
4822 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
4824 function_parameter_t *parameter
4825 = obstack_alloc(type_obst, sizeof(parameter[0]));
4826 memset(parameter, 0, sizeof(parameter[0]));
4827 parameter->type = argument_type;
4829 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4830 type->function.return_type = return_type;
4831 type->function.parameters = parameter;
4833 type_t *result = typehash_insert(type);
4834 if(result != type) {
4841 static type_t *make_function_0_type(type_t *return_type)
4843 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4844 type->function.return_type = return_type;
4845 type->function.parameters = NULL;
4847 type_t *result = typehash_insert(type);
4848 if(result != type) {
4856 * Creates a function type for some function like builtins.
4858 * @param symbol the symbol describing the builtin
4860 static type_t *get_builtin_symbol_type(symbol_t *symbol)
4862 switch(symbol->ID) {
4863 case T___builtin_alloca:
4864 return make_function_1_type(type_void_ptr, type_size_t);
4865 case T___builtin_huge_val:
4866 return make_function_0_type(type_double);
4867 case T___builtin_nan:
4868 return make_function_1_type(type_double, type_char_ptr);
4869 case T___builtin_nanf:
4870 return make_function_1_type(type_float, type_char_ptr);
4871 case T___builtin_nand:
4872 return make_function_1_type(type_long_double, type_char_ptr);
4873 case T___builtin_va_end:
4874 return make_function_1_type(type_void, type_valist);
4876 internal_errorf(HERE, "not implemented builtin symbol found");
4881 * Performs automatic type cast as described in § 6.3.2.1.
4883 * @param orig_type the original type
4885 static type_t *automatic_type_conversion(type_t *orig_type)
4887 type_t *type = skip_typeref(orig_type);
4888 if(is_type_array(type)) {
4889 array_type_t *array_type = &type->array;
4890 type_t *element_type = array_type->element_type;
4891 unsigned qualifiers = array_type->base.qualifiers;
4893 return make_pointer_type(element_type, qualifiers);
4896 if(is_type_function(type)) {
4897 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4904 * reverts the automatic casts of array to pointer types and function
4905 * to function-pointer types as defined § 6.3.2.1
4907 type_t *revert_automatic_type_conversion(const expression_t *expression)
4909 switch (expression->kind) {
4910 case EXPR_REFERENCE: return expression->reference.declaration->type;
4911 case EXPR_SELECT: return expression->select.compound_entry->type;
4913 case EXPR_UNARY_DEREFERENCE: {
4914 const expression_t *const value = expression->unary.value;
4915 type_t *const type = skip_typeref(value->base.type);
4916 assert(is_type_pointer(type));
4917 return type->pointer.points_to;
4920 case EXPR_BUILTIN_SYMBOL:
4921 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
4923 case EXPR_ARRAY_ACCESS: {
4924 const expression_t *array_ref = expression->array_access.array_ref;
4925 type_t *type_left = skip_typeref(array_ref->base.type);
4926 if (!is_type_valid(type_left))
4928 assert(is_type_pointer(type_left));
4929 return type_left->pointer.points_to;
4932 case EXPR_STRING_LITERAL: {
4933 size_t size = expression->string.value.size;
4934 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
4937 case EXPR_WIDE_STRING_LITERAL: {
4938 size_t size = expression->wide_string.value.size;
4939 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
4942 case EXPR_COMPOUND_LITERAL:
4943 return expression->compound_literal.type;
4948 return expression->base.type;
4951 static expression_t *parse_reference(void)
4953 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
4955 reference_expression_t *ref = &expression->reference;
4956 symbol_t *const symbol = token.v.symbol;
4958 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
4960 source_position_t source_position = token.source_position;
4963 if(declaration == NULL) {
4964 if (! strict_mode && token.type == '(') {
4965 /* an implicitly defined function */
4966 if (warning.implicit_function_declaration) {
4967 warningf(HERE, "implicit declaration of function '%Y'",
4971 declaration = create_implicit_function(symbol,
4974 errorf(HERE, "unknown symbol '%Y' found.", symbol);
4975 return create_invalid_expression();
4979 type_t *type = declaration->type;
4981 /* we always do the auto-type conversions; the & and sizeof parser contains
4982 * code to revert this! */
4983 type = automatic_type_conversion(type);
4985 ref->declaration = declaration;
4986 ref->base.type = type;
4988 /* this declaration is used */
4989 declaration->used = true;
4991 /* check for deprecated functions */
4992 if(declaration->deprecated != 0) {
4993 const char *prefix = "";
4994 if (is_type_function(declaration->type))
4995 prefix = "function ";
4997 if (declaration->deprecated_string != NULL) {
4998 warningf(&source_position,
4999 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
5000 declaration->deprecated_string);
5002 warningf(&source_position,
5003 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
5010 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5014 /* TODO check if explicit cast is allowed and issue warnings/errors */
5017 static expression_t *parse_compound_literal(type_t *type)
5019 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5021 parse_initializer_env_t env;
5023 env.declaration = NULL;
5024 env.must_be_constant = false;
5025 initializer_t *initializer = parse_initializer(&env);
5028 expression->compound_literal.initializer = initializer;
5029 expression->compound_literal.type = type;
5030 expression->base.type = automatic_type_conversion(type);
5036 * Parse a cast expression.
5038 static expression_t *parse_cast(void)
5040 source_position_t source_position = token.source_position;
5042 type_t *type = parse_typename();
5044 /* matching add_anchor_token() is at call site */
5045 rem_anchor_token(')');
5048 if(token.type == '{') {
5049 return parse_compound_literal(type);
5052 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5053 cast->base.source_position = source_position;
5055 expression_t *value = parse_sub_expression(20);
5057 check_cast_allowed(value, type);
5059 cast->base.type = type;
5060 cast->unary.value = value;
5064 return create_invalid_expression();
5068 * Parse a statement expression.
5070 static expression_t *parse_statement_expression(void)
5072 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5074 statement_t *statement = parse_compound_statement(true);
5075 expression->statement.statement = statement;
5076 expression->base.source_position = statement->base.source_position;
5078 /* find last statement and use its type */
5079 type_t *type = type_void;
5080 const statement_t *stmt = statement->compound.statements;
5082 while (stmt->base.next != NULL)
5083 stmt = stmt->base.next;
5085 if (stmt->kind == STATEMENT_EXPRESSION) {
5086 type = stmt->expression.expression->base.type;
5089 warningf(&expression->base.source_position, "empty statement expression ({})");
5091 expression->base.type = type;
5097 return create_invalid_expression();
5101 * Parse a braced expression.
5103 static expression_t *parse_brace_expression(void)
5106 add_anchor_token(')');
5108 switch(token.type) {
5110 /* gcc extension: a statement expression */
5111 return parse_statement_expression();
5115 return parse_cast();
5117 if(is_typedef_symbol(token.v.symbol)) {
5118 return parse_cast();
5122 expression_t *result = parse_expression();
5123 rem_anchor_token(')');
5128 return create_invalid_expression();
5131 static expression_t *parse_function_keyword(void)
5136 if (current_function == NULL) {
5137 errorf(HERE, "'__func__' used outside of a function");
5140 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5141 expression->base.type = type_char_ptr;
5142 expression->funcname.kind = FUNCNAME_FUNCTION;
5147 static expression_t *parse_pretty_function_keyword(void)
5149 eat(T___PRETTY_FUNCTION__);
5151 if (current_function == NULL) {
5152 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5155 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5156 expression->base.type = type_char_ptr;
5157 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5162 static expression_t *parse_funcsig_keyword(void)
5166 if (current_function == NULL) {
5167 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5170 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5171 expression->base.type = type_char_ptr;
5172 expression->funcname.kind = FUNCNAME_FUNCSIG;
5177 static expression_t *parse_funcdname_keyword(void)
5179 eat(T___FUNCDNAME__);
5181 if (current_function == NULL) {
5182 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5185 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5186 expression->base.type = type_char_ptr;
5187 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5192 static designator_t *parse_designator(void)
5194 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5195 result->source_position = *HERE;
5197 if(token.type != T_IDENTIFIER) {
5198 parse_error_expected("while parsing member designator",
5199 T_IDENTIFIER, NULL);
5202 result->symbol = token.v.symbol;
5205 designator_t *last_designator = result;
5207 if(token.type == '.') {
5209 if(token.type != T_IDENTIFIER) {
5210 parse_error_expected("while parsing member designator",
5211 T_IDENTIFIER, NULL);
5214 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5215 designator->source_position = *HERE;
5216 designator->symbol = token.v.symbol;
5219 last_designator->next = designator;
5220 last_designator = designator;
5223 if(token.type == '[') {
5225 add_anchor_token(']');
5226 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5227 designator->source_position = *HERE;
5228 designator->array_index = parse_expression();
5229 rem_anchor_token(']');
5231 if(designator->array_index == NULL) {
5235 last_designator->next = designator;
5236 last_designator = designator;
5248 * Parse the __builtin_offsetof() expression.
5250 static expression_t *parse_offsetof(void)
5252 eat(T___builtin_offsetof);
5254 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5255 expression->base.type = type_size_t;
5258 add_anchor_token(',');
5259 type_t *type = parse_typename();
5260 rem_anchor_token(',');
5262 add_anchor_token(')');
5263 designator_t *designator = parse_designator();
5264 rem_anchor_token(')');
5267 expression->offsetofe.type = type;
5268 expression->offsetofe.designator = designator;
5271 memset(&path, 0, sizeof(path));
5272 path.top_type = type;
5273 path.path = NEW_ARR_F(type_path_entry_t, 0);
5275 descend_into_subtype(&path);
5277 if(!walk_designator(&path, designator, true)) {
5278 return create_invalid_expression();
5281 DEL_ARR_F(path.path);
5285 return create_invalid_expression();
5289 * Parses a _builtin_va_start() expression.
5291 static expression_t *parse_va_start(void)
5293 eat(T___builtin_va_start);
5295 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5298 add_anchor_token(',');
5299 expression->va_starte.ap = parse_assignment_expression();
5300 rem_anchor_token(',');
5302 expression_t *const expr = parse_assignment_expression();
5303 if (expr->kind == EXPR_REFERENCE) {
5304 declaration_t *const decl = expr->reference.declaration;
5306 return create_invalid_expression();
5307 if (decl->parent_scope == ¤t_function->scope &&
5308 decl->next == NULL) {
5309 expression->va_starte.parameter = decl;
5314 errorf(&expr->base.source_position,
5315 "second argument of 'va_start' must be last parameter of the current function");
5317 return create_invalid_expression();
5321 * Parses a _builtin_va_arg() expression.
5323 static expression_t *parse_va_arg(void)
5325 eat(T___builtin_va_arg);
5327 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5330 expression->va_arge.ap = parse_assignment_expression();
5332 expression->base.type = parse_typename();
5337 return create_invalid_expression();
5340 static expression_t *parse_builtin_symbol(void)
5342 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5344 symbol_t *symbol = token.v.symbol;
5346 expression->builtin_symbol.symbol = symbol;
5349 type_t *type = get_builtin_symbol_type(symbol);
5350 type = automatic_type_conversion(type);
5352 expression->base.type = type;
5357 * Parses a __builtin_constant() expression.
5359 static expression_t *parse_builtin_constant(void)
5361 eat(T___builtin_constant_p);
5363 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5366 add_anchor_token(')');
5367 expression->builtin_constant.value = parse_assignment_expression();
5368 rem_anchor_token(')');
5370 expression->base.type = type_int;
5374 return create_invalid_expression();
5378 * Parses a __builtin_prefetch() expression.
5380 static expression_t *parse_builtin_prefetch(void)
5382 eat(T___builtin_prefetch);
5384 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5387 add_anchor_token(')');
5388 expression->builtin_prefetch.adr = parse_assignment_expression();
5389 if (token.type == ',') {
5391 expression->builtin_prefetch.rw = parse_assignment_expression();
5393 if (token.type == ',') {
5395 expression->builtin_prefetch.locality = parse_assignment_expression();
5397 rem_anchor_token(')');
5399 expression->base.type = type_void;
5403 return create_invalid_expression();
5407 * Parses a __builtin_is_*() compare expression.
5409 static expression_t *parse_compare_builtin(void)
5411 expression_t *expression;
5413 switch(token.type) {
5414 case T___builtin_isgreater:
5415 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5417 case T___builtin_isgreaterequal:
5418 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5420 case T___builtin_isless:
5421 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5423 case T___builtin_islessequal:
5424 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5426 case T___builtin_islessgreater:
5427 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5429 case T___builtin_isunordered:
5430 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5433 internal_errorf(HERE, "invalid compare builtin found");
5436 expression->base.source_position = *HERE;
5440 expression->binary.left = parse_assignment_expression();
5442 expression->binary.right = parse_assignment_expression();
5445 type_t *const orig_type_left = expression->binary.left->base.type;
5446 type_t *const orig_type_right = expression->binary.right->base.type;
5448 type_t *const type_left = skip_typeref(orig_type_left);
5449 type_t *const type_right = skip_typeref(orig_type_right);
5450 if(!is_type_float(type_left) && !is_type_float(type_right)) {
5451 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5452 type_error_incompatible("invalid operands in comparison",
5453 &expression->base.source_position, orig_type_left, orig_type_right);
5456 semantic_comparison(&expression->binary);
5461 return create_invalid_expression();
5465 * Parses a __builtin_expect() expression.
5467 static expression_t *parse_builtin_expect(void)
5469 eat(T___builtin_expect);
5471 expression_t *expression
5472 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5475 expression->binary.left = parse_assignment_expression();
5477 expression->binary.right = parse_constant_expression();
5480 expression->base.type = expression->binary.left->base.type;
5484 return create_invalid_expression();
5488 * Parses a MS assume() expression.
5490 static expression_t *parse_assume(void) {
5493 expression_t *expression
5494 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5497 add_anchor_token(')');
5498 expression->unary.value = parse_assignment_expression();
5499 rem_anchor_token(')');
5502 expression->base.type = type_void;
5505 return create_invalid_expression();
5509 * Parse a microsoft __noop expression.
5511 static expression_t *parse_noop_expression(void) {
5512 source_position_t source_position = *HERE;
5515 if (token.type == '(') {
5516 /* parse arguments */
5518 add_anchor_token(')');
5519 add_anchor_token(',');
5521 if(token.type != ')') {
5523 (void)parse_assignment_expression();
5524 if(token.type != ',')
5530 rem_anchor_token(',');
5531 rem_anchor_token(')');
5534 /* the result is a (int)0 */
5535 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5536 cnst->base.source_position = source_position;
5537 cnst->base.type = type_int;
5538 cnst->conste.v.int_value = 0;
5539 cnst->conste.is_ms_noop = true;
5544 return create_invalid_expression();
5548 * Parses a primary expression.
5550 static expression_t *parse_primary_expression(void)
5552 switch (token.type) {
5553 case T_INTEGER: return parse_int_const();
5554 case T_CHARACTER_CONSTANT: return parse_character_constant();
5555 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5556 case T_FLOATINGPOINT: return parse_float_const();
5557 case T_STRING_LITERAL:
5558 case T_WIDE_STRING_LITERAL: return parse_string_const();
5559 case T_IDENTIFIER: return parse_reference();
5560 case T___FUNCTION__:
5561 case T___func__: return parse_function_keyword();
5562 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5563 case T___FUNCSIG__: return parse_funcsig_keyword();
5564 case T___FUNCDNAME__: return parse_funcdname_keyword();
5565 case T___builtin_offsetof: return parse_offsetof();
5566 case T___builtin_va_start: return parse_va_start();
5567 case T___builtin_va_arg: return parse_va_arg();
5568 case T___builtin_expect: return parse_builtin_expect();
5569 case T___builtin_alloca:
5570 case T___builtin_nan:
5571 case T___builtin_nand:
5572 case T___builtin_nanf:
5573 case T___builtin_huge_val:
5574 case T___builtin_va_end: return parse_builtin_symbol();
5575 case T___builtin_isgreater:
5576 case T___builtin_isgreaterequal:
5577 case T___builtin_isless:
5578 case T___builtin_islessequal:
5579 case T___builtin_islessgreater:
5580 case T___builtin_isunordered: return parse_compare_builtin();
5581 case T___builtin_constant_p: return parse_builtin_constant();
5582 case T___builtin_prefetch: return parse_builtin_prefetch();
5583 case T__assume: return parse_assume();
5585 case '(': return parse_brace_expression();
5586 case T___noop: return parse_noop_expression();
5589 errorf(HERE, "unexpected token %K, expected an expression", &token);
5590 return create_invalid_expression();
5594 * Check if the expression has the character type and issue a warning then.
5596 static void check_for_char_index_type(const expression_t *expression) {
5597 type_t *const type = expression->base.type;
5598 const type_t *const base_type = skip_typeref(type);
5600 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5601 warning.char_subscripts) {
5602 warningf(&expression->base.source_position,
5603 "array subscript has type '%T'", type);
5607 static expression_t *parse_array_expression(unsigned precedence,
5613 add_anchor_token(']');
5615 expression_t *inside = parse_expression();
5617 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5619 array_access_expression_t *array_access = &expression->array_access;
5621 type_t *const orig_type_left = left->base.type;
5622 type_t *const orig_type_inside = inside->base.type;
5624 type_t *const type_left = skip_typeref(orig_type_left);
5625 type_t *const type_inside = skip_typeref(orig_type_inside);
5627 type_t *return_type;
5628 if (is_type_pointer(type_left)) {
5629 return_type = type_left->pointer.points_to;
5630 array_access->array_ref = left;
5631 array_access->index = inside;
5632 check_for_char_index_type(inside);
5633 } else if (is_type_pointer(type_inside)) {
5634 return_type = type_inside->pointer.points_to;
5635 array_access->array_ref = inside;
5636 array_access->index = left;
5637 array_access->flipped = true;
5638 check_for_char_index_type(left);
5640 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5642 "array access on object with non-pointer types '%T', '%T'",
5643 orig_type_left, orig_type_inside);
5645 return_type = type_error_type;
5646 array_access->array_ref = create_invalid_expression();
5649 rem_anchor_token(']');
5650 if(token.type != ']') {
5651 parse_error_expected("Problem while parsing array access", ']', NULL);
5656 return_type = automatic_type_conversion(return_type);
5657 expression->base.type = return_type;
5662 static expression_t *parse_typeprop(expression_kind_t const kind,
5663 source_position_t const pos,
5664 unsigned const precedence)
5666 expression_t *tp_expression = allocate_expression_zero(kind);
5667 tp_expression->base.type = type_size_t;
5668 tp_expression->base.source_position = pos;
5670 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
5672 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
5674 add_anchor_token(')');
5675 type_t* const orig_type = parse_typename();
5676 tp_expression->typeprop.type = orig_type;
5678 type_t const* const type = skip_typeref(orig_type);
5679 char const* const wrong_type =
5680 is_type_incomplete(type) ? "incomplete" :
5681 type->kind == TYPE_FUNCTION ? "function designator" :
5682 type->kind == TYPE_BITFIELD ? "bitfield" :
5684 if (wrong_type != NULL) {
5685 errorf(&pos, "operand of %s expression must not be %s type '%T'",
5686 what, wrong_type, type);
5689 rem_anchor_token(')');
5692 expression_t *expression = parse_sub_expression(precedence);
5694 type_t* const orig_type = revert_automatic_type_conversion(expression);
5695 expression->base.type = orig_type;
5697 type_t const* const type = skip_typeref(orig_type);
5698 char const* const wrong_type =
5699 is_type_incomplete(type) ? "incomplete" :
5700 type->kind == TYPE_FUNCTION ? "function designator" :
5701 type->kind == TYPE_BITFIELD ? "bitfield" :
5703 if (wrong_type != NULL) {
5704 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
5707 tp_expression->typeprop.type = expression->base.type;
5708 tp_expression->typeprop.tp_expression = expression;
5711 return tp_expression;
5713 return create_invalid_expression();
5716 static expression_t *parse_sizeof(unsigned precedence)
5718 source_position_t pos = *HERE;
5720 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
5723 static expression_t *parse_alignof(unsigned precedence)
5725 source_position_t pos = *HERE;
5727 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
5730 static expression_t *parse_select_expression(unsigned precedence,
5731 expression_t *compound)
5734 assert(token.type == '.' || token.type == T_MINUSGREATER);
5736 bool is_pointer = (token.type == T_MINUSGREATER);
5739 expression_t *select = allocate_expression_zero(EXPR_SELECT);
5740 select->select.compound = compound;
5742 if (token.type != T_IDENTIFIER) {
5743 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
5746 symbol_t *symbol = token.v.symbol;
5747 select->select.symbol = symbol;
5750 type_t *const orig_type = compound->base.type;
5751 type_t *const type = skip_typeref(orig_type);
5753 type_t *type_left = type;
5755 if (!is_type_pointer(type)) {
5756 if (is_type_valid(type)) {
5757 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
5759 return create_invalid_expression();
5761 type_left = type->pointer.points_to;
5763 type_left = skip_typeref(type_left);
5765 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
5766 type_left->kind != TYPE_COMPOUND_UNION) {
5767 if (is_type_valid(type_left)) {
5768 errorf(HERE, "request for member '%Y' in something not a struct or "
5769 "union, but '%T'", symbol, type_left);
5771 return create_invalid_expression();
5774 declaration_t *const declaration = type_left->compound.declaration;
5776 if (!declaration->init.complete) {
5777 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
5779 return create_invalid_expression();
5782 declaration_t *iter = find_compound_entry(declaration, symbol);
5784 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
5785 return create_invalid_expression();
5788 /* we always do the auto-type conversions; the & and sizeof parser contains
5789 * code to revert this! */
5790 type_t *expression_type = automatic_type_conversion(iter->type);
5792 select->select.compound_entry = iter;
5793 select->base.type = expression_type;
5795 type_t *skipped = skip_typeref(iter->type);
5796 if (skipped->kind == TYPE_BITFIELD) {
5797 select->base.type = skipped->bitfield.base_type;
5804 * Parse a call expression, ie. expression '( ... )'.
5806 * @param expression the function address
5808 static expression_t *parse_call_expression(unsigned precedence,
5809 expression_t *expression)
5812 expression_t *result = allocate_expression_zero(EXPR_CALL);
5813 result->base.source_position = expression->base.source_position;
5815 call_expression_t *call = &result->call;
5816 call->function = expression;
5818 type_t *const orig_type = expression->base.type;
5819 type_t *const type = skip_typeref(orig_type);
5821 function_type_t *function_type = NULL;
5822 if (is_type_pointer(type)) {
5823 type_t *const to_type = skip_typeref(type->pointer.points_to);
5825 if (is_type_function(to_type)) {
5826 function_type = &to_type->function;
5827 call->base.type = function_type->return_type;
5831 if (function_type == NULL && is_type_valid(type)) {
5832 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
5835 /* parse arguments */
5837 add_anchor_token(')');
5838 add_anchor_token(',');
5840 if(token.type != ')') {
5841 call_argument_t *last_argument = NULL;
5844 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
5846 argument->expression = parse_assignment_expression();
5847 if(last_argument == NULL) {
5848 call->arguments = argument;
5850 last_argument->next = argument;
5852 last_argument = argument;
5854 if(token.type != ',')
5859 rem_anchor_token(',');
5860 rem_anchor_token(')');
5863 if(function_type == NULL)
5866 function_parameter_t *parameter = function_type->parameters;
5867 call_argument_t *argument = call->arguments;
5868 if (!function_type->unspecified_parameters) {
5869 for( ; parameter != NULL && argument != NULL;
5870 parameter = parameter->next, argument = argument->next) {
5871 type_t *expected_type = parameter->type;
5872 /* TODO report scope in error messages */
5873 expression_t *const arg_expr = argument->expression;
5874 type_t *const res_type = semantic_assign(expected_type, arg_expr,
5876 &arg_expr->base.source_position);
5877 if (res_type == NULL) {
5878 /* TODO improve error message */
5879 errorf(&arg_expr->base.source_position,
5880 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
5881 arg_expr, arg_expr->base.type, expected_type);
5883 argument->expression = create_implicit_cast(argument->expression, expected_type);
5887 if (parameter != NULL) {
5888 errorf(HERE, "too few arguments to function '%E'", expression);
5889 } else if (argument != NULL && !function_type->variadic) {
5890 errorf(HERE, "too many arguments to function '%E'", expression);
5894 /* do default promotion */
5895 for( ; argument != NULL; argument = argument->next) {
5896 type_t *type = argument->expression->base.type;
5898 type = get_default_promoted_type(type);
5900 argument->expression
5901 = create_implicit_cast(argument->expression, type);
5904 check_format(&result->call);
5908 return create_invalid_expression();
5911 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
5913 static bool same_compound_type(const type_t *type1, const type_t *type2)
5916 is_type_compound(type1) &&
5917 type1->kind == type2->kind &&
5918 type1->compound.declaration == type2->compound.declaration;
5922 * Parse a conditional expression, ie. 'expression ? ... : ...'.
5924 * @param expression the conditional expression
5926 static expression_t *parse_conditional_expression(unsigned precedence,
5927 expression_t *expression)
5930 add_anchor_token(':');
5932 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
5934 conditional_expression_t *conditional = &result->conditional;
5935 conditional->condition = expression;
5938 type_t *const condition_type_orig = expression->base.type;
5939 type_t *const condition_type = skip_typeref(condition_type_orig);
5940 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
5941 type_error("expected a scalar type in conditional condition",
5942 &expression->base.source_position, condition_type_orig);
5945 expression_t *true_expression = parse_expression();
5946 rem_anchor_token(':');
5948 expression_t *false_expression = parse_sub_expression(precedence);
5950 type_t *const orig_true_type = true_expression->base.type;
5951 type_t *const orig_false_type = false_expression->base.type;
5952 type_t *const true_type = skip_typeref(orig_true_type);
5953 type_t *const false_type = skip_typeref(orig_false_type);
5956 type_t *result_type;
5957 if(is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
5958 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5959 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
5960 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5961 warningf(&expression->base.source_position,
5962 "ISO C forbids conditional expression with only one void side");
5964 result_type = type_void;
5965 } else if (is_type_arithmetic(true_type)
5966 && is_type_arithmetic(false_type)) {
5967 result_type = semantic_arithmetic(true_type, false_type);
5969 true_expression = create_implicit_cast(true_expression, result_type);
5970 false_expression = create_implicit_cast(false_expression, result_type);
5972 conditional->true_expression = true_expression;
5973 conditional->false_expression = false_expression;
5974 conditional->base.type = result_type;
5975 } else if (same_compound_type(true_type, false_type)) {
5976 /* just take 1 of the 2 types */
5977 result_type = true_type;
5978 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
5979 type_t *pointer_type;
5981 expression_t *other_expression;
5982 if (is_type_pointer(true_type)) {
5983 pointer_type = true_type;
5984 other_type = false_type;
5985 other_expression = false_expression;
5987 pointer_type = false_type;
5988 other_type = true_type;
5989 other_expression = true_expression;
5992 if(is_type_pointer(other_type)) {
5993 if(!pointers_compatible(true_type, false_type)) {
5994 warningf(&expression->base.source_position,
5995 "pointer types '%T' and '%T' in conditional expression are incompatible", true_type, false_type);
5997 result_type = true_type;
5998 } else if(is_null_pointer_constant(other_expression)) {
5999 result_type = pointer_type;
6000 } else if(is_type_integer(other_type)) {
6001 warningf(&expression->base.source_position,
6002 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
6003 result_type = pointer_type;
6005 type_error_incompatible("while parsing conditional",
6006 &expression->base.source_position, true_type, false_type);
6007 result_type = type_error_type;
6010 /* TODO: one pointer to void*, other some pointer */
6012 if (is_type_valid(true_type) && is_type_valid(false_type)) {
6013 type_error_incompatible("while parsing conditional",
6014 &expression->base.source_position, true_type,
6017 result_type = type_error_type;
6020 conditional->true_expression
6021 = create_implicit_cast(true_expression, result_type);
6022 conditional->false_expression
6023 = create_implicit_cast(false_expression, result_type);
6024 conditional->base.type = result_type;
6027 return create_invalid_expression();
6031 * Parse an extension expression.
6033 static expression_t *parse_extension(unsigned precedence)
6035 eat(T___extension__);
6037 /* TODO enable extensions */
6038 expression_t *expression = parse_sub_expression(precedence);
6039 /* TODO disable extensions */
6044 * Parse a __builtin_classify_type() expression.
6046 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6048 eat(T___builtin_classify_type);
6050 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6051 result->base.type = type_int;
6054 add_anchor_token(')');
6055 expression_t *expression = parse_sub_expression(precedence);
6056 rem_anchor_token(')');
6058 result->classify_type.type_expression = expression;
6062 return create_invalid_expression();
6065 static void semantic_incdec(unary_expression_t *expression)
6067 type_t *const orig_type = expression->value->base.type;
6068 type_t *const type = skip_typeref(orig_type);
6069 /* TODO !is_type_real && !is_type_pointer */
6070 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
6071 if (is_type_valid(type)) {
6072 /* TODO: improve error message */
6073 errorf(HERE, "operation needs an arithmetic or pointer type");
6078 expression->base.type = orig_type;
6081 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6083 type_t *const orig_type = expression->value->base.type;
6084 type_t *const type = skip_typeref(orig_type);
6085 if(!is_type_arithmetic(type)) {
6086 if (is_type_valid(type)) {
6087 /* TODO: improve error message */
6088 errorf(HERE, "operation needs an arithmetic type");
6093 expression->base.type = orig_type;
6096 static void semantic_unexpr_scalar(unary_expression_t *expression)
6098 type_t *const orig_type = expression->value->base.type;
6099 type_t *const type = skip_typeref(orig_type);
6100 if (!is_type_scalar(type)) {
6101 if (is_type_valid(type)) {
6102 errorf(HERE, "operand of ! must be of scalar type");
6107 expression->base.type = orig_type;
6110 static void semantic_unexpr_integer(unary_expression_t *expression)
6112 type_t *const orig_type = expression->value->base.type;
6113 type_t *const type = skip_typeref(orig_type);
6114 if (!is_type_integer(type)) {
6115 if (is_type_valid(type)) {
6116 errorf(HERE, "operand of ~ must be of integer type");
6121 expression->base.type = orig_type;
6124 static void semantic_dereference(unary_expression_t *expression)
6126 type_t *const orig_type = expression->value->base.type;
6127 type_t *const type = skip_typeref(orig_type);
6128 if(!is_type_pointer(type)) {
6129 if (is_type_valid(type)) {
6130 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6135 type_t *result_type = type->pointer.points_to;
6136 result_type = automatic_type_conversion(result_type);
6137 expression->base.type = result_type;
6141 * Check the semantic of the address taken expression.
6143 static void semantic_take_addr(unary_expression_t *expression)
6145 expression_t *value = expression->value;
6146 value->base.type = revert_automatic_type_conversion(value);
6148 type_t *orig_type = value->base.type;
6149 if(!is_type_valid(orig_type))
6152 if(value->kind == EXPR_REFERENCE) {
6153 declaration_t *const declaration = value->reference.declaration;
6154 if(declaration != NULL) {
6155 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
6156 errorf(&expression->base.source_position,
6157 "address of register variable '%Y' requested",
6158 declaration->symbol);
6160 declaration->address_taken = 1;
6164 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6167 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6168 static expression_t *parse_##unexpression_type(unsigned precedence) \
6172 expression_t *unary_expression \
6173 = allocate_expression_zero(unexpression_type); \
6174 unary_expression->base.source_position = *HERE; \
6175 unary_expression->unary.value = parse_sub_expression(precedence); \
6177 sfunc(&unary_expression->unary); \
6179 return unary_expression; \
6182 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6183 semantic_unexpr_arithmetic)
6184 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6185 semantic_unexpr_arithmetic)
6186 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6187 semantic_unexpr_scalar)
6188 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6189 semantic_dereference)
6190 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6192 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6193 semantic_unexpr_integer)
6194 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6196 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6199 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6201 static expression_t *parse_##unexpression_type(unsigned precedence, \
6202 expression_t *left) \
6204 (void) precedence; \
6207 expression_t *unary_expression \
6208 = allocate_expression_zero(unexpression_type); \
6209 unary_expression->unary.value = left; \
6211 sfunc(&unary_expression->unary); \
6213 return unary_expression; \
6216 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6217 EXPR_UNARY_POSTFIX_INCREMENT,
6219 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6220 EXPR_UNARY_POSTFIX_DECREMENT,
6223 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6225 /* TODO: handle complex + imaginary types */
6227 /* § 6.3.1.8 Usual arithmetic conversions */
6228 if(type_left == type_long_double || type_right == type_long_double) {
6229 return type_long_double;
6230 } else if(type_left == type_double || type_right == type_double) {
6232 } else if(type_left == type_float || type_right == type_float) {
6236 type_right = promote_integer(type_right);
6237 type_left = promote_integer(type_left);
6239 if(type_left == type_right)
6242 bool signed_left = is_type_signed(type_left);
6243 bool signed_right = is_type_signed(type_right);
6244 int rank_left = get_rank(type_left);
6245 int rank_right = get_rank(type_right);
6246 if(rank_left < rank_right) {
6247 if(signed_left == signed_right || !signed_right) {
6253 if(signed_left == signed_right || !signed_left) {
6262 * Check the semantic restrictions for a binary expression.
6264 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6266 expression_t *const left = expression->left;
6267 expression_t *const right = expression->right;
6268 type_t *const orig_type_left = left->base.type;
6269 type_t *const orig_type_right = right->base.type;
6270 type_t *const type_left = skip_typeref(orig_type_left);
6271 type_t *const type_right = skip_typeref(orig_type_right);
6273 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6274 /* TODO: improve error message */
6275 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6276 errorf(HERE, "operation needs arithmetic types");
6281 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6282 expression->left = create_implicit_cast(left, arithmetic_type);
6283 expression->right = create_implicit_cast(right, arithmetic_type);
6284 expression->base.type = arithmetic_type;
6287 static void semantic_shift_op(binary_expression_t *expression)
6289 expression_t *const left = expression->left;
6290 expression_t *const right = expression->right;
6291 type_t *const orig_type_left = left->base.type;
6292 type_t *const orig_type_right = right->base.type;
6293 type_t * type_left = skip_typeref(orig_type_left);
6294 type_t * type_right = skip_typeref(orig_type_right);
6296 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
6297 /* TODO: improve error message */
6298 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6299 errorf(HERE, "operation needs integer types");
6304 type_left = promote_integer(type_left);
6305 type_right = promote_integer(type_right);
6307 expression->left = create_implicit_cast(left, type_left);
6308 expression->right = create_implicit_cast(right, type_right);
6309 expression->base.type = type_left;
6312 static void semantic_add(binary_expression_t *expression)
6314 expression_t *const left = expression->left;
6315 expression_t *const right = expression->right;
6316 type_t *const orig_type_left = left->base.type;
6317 type_t *const orig_type_right = right->base.type;
6318 type_t *const type_left = skip_typeref(orig_type_left);
6319 type_t *const type_right = skip_typeref(orig_type_right);
6322 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6323 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6324 expression->left = create_implicit_cast(left, arithmetic_type);
6325 expression->right = create_implicit_cast(right, arithmetic_type);
6326 expression->base.type = arithmetic_type;
6328 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6329 expression->base.type = type_left;
6330 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
6331 expression->base.type = type_right;
6332 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6333 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
6337 static void semantic_sub(binary_expression_t *expression)
6339 expression_t *const left = expression->left;
6340 expression_t *const right = expression->right;
6341 type_t *const orig_type_left = left->base.type;
6342 type_t *const orig_type_right = right->base.type;
6343 type_t *const type_left = skip_typeref(orig_type_left);
6344 type_t *const type_right = skip_typeref(orig_type_right);
6347 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6348 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6349 expression->left = create_implicit_cast(left, arithmetic_type);
6350 expression->right = create_implicit_cast(right, arithmetic_type);
6351 expression->base.type = arithmetic_type;
6353 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6354 expression->base.type = type_left;
6355 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
6356 if(!pointers_compatible(type_left, type_right)) {
6358 "pointers to incompatible objects to binary '-' ('%T', '%T')",
6359 orig_type_left, orig_type_right);
6361 expression->base.type = type_ptrdiff_t;
6363 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6364 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')",
6365 orig_type_left, orig_type_right);
6370 * Check the semantics of comparison expressions.
6372 * @param expression The expression to check.
6374 static void semantic_comparison(binary_expression_t *expression)
6376 expression_t *left = expression->left;
6377 expression_t *right = expression->right;
6378 type_t *orig_type_left = left->base.type;
6379 type_t *orig_type_right = right->base.type;
6381 type_t *type_left = skip_typeref(orig_type_left);
6382 type_t *type_right = skip_typeref(orig_type_right);
6384 /* TODO non-arithmetic types */
6385 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6386 /* test for signed vs unsigned compares */
6387 if (warning.sign_compare &&
6388 (expression->base.kind != EXPR_BINARY_EQUAL &&
6389 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6390 (is_type_signed(type_left) != is_type_signed(type_right))) {
6392 /* check if 1 of the operands is a constant, in this case we just
6393 * check wether we can safely represent the resulting constant in
6394 * the type of the other operand. */
6395 expression_t *const_expr = NULL;
6396 expression_t *other_expr = NULL;
6398 if(is_constant_expression(left)) {
6401 } else if(is_constant_expression(right)) {
6406 if(const_expr != NULL) {
6407 type_t *other_type = skip_typeref(other_expr->base.type);
6408 long val = fold_constant(const_expr);
6409 /* TODO: check if val can be represented by other_type */
6413 warningf(&expression->base.source_position,
6414 "comparison between signed and unsigned");
6416 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6417 expression->left = create_implicit_cast(left, arithmetic_type);
6418 expression->right = create_implicit_cast(right, arithmetic_type);
6419 expression->base.type = arithmetic_type;
6420 if (warning.float_equal &&
6421 (expression->base.kind == EXPR_BINARY_EQUAL ||
6422 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6423 is_type_float(arithmetic_type)) {
6424 warningf(&expression->base.source_position,
6425 "comparing floating point with == or != is unsafe");
6427 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6428 /* TODO check compatibility */
6429 } else if (is_type_pointer(type_left)) {
6430 expression->right = create_implicit_cast(right, type_left);
6431 } else if (is_type_pointer(type_right)) {
6432 expression->left = create_implicit_cast(left, type_right);
6433 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6434 type_error_incompatible("invalid operands in comparison",
6435 &expression->base.source_position,
6436 type_left, type_right);
6438 expression->base.type = type_int;
6442 * Checks if a compound type has constant fields.
6444 static bool has_const_fields(const compound_type_t *type)
6446 const scope_t *scope = &type->declaration->scope;
6447 const declaration_t *declaration = scope->declarations;
6449 for (; declaration != NULL; declaration = declaration->next) {
6450 if (declaration->namespc != NAMESPACE_NORMAL)
6453 const type_t *decl_type = skip_typeref(declaration->type);
6454 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6461 static bool is_valid_assignment_lhs(expression_t const* const left)
6463 type_t *const orig_type_left = revert_automatic_type_conversion(left);
6464 type_t *const type_left = skip_typeref(orig_type_left);
6466 switch (left->kind) {
6467 case EXPR_REFERENCE:
6468 case EXPR_ARRAY_ACCESS:
6470 case EXPR_UNARY_DEREFERENCE:
6474 errorf(HERE, "left hand side '%E' of assignment is not an lvalue", left);
6478 if (is_type_array(type_left)) {
6479 errorf(HERE, "cannot assign to arrays ('%E')", left);
6482 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6483 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6487 if (is_type_incomplete(type_left)) {
6488 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
6489 left, orig_type_left);
6492 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6493 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6494 left, orig_type_left);
6501 static void semantic_arithmetic_assign(binary_expression_t *expression)
6503 expression_t *left = expression->left;
6504 expression_t *right = expression->right;
6505 type_t *orig_type_left = left->base.type;
6506 type_t *orig_type_right = right->base.type;
6508 if (!is_valid_assignment_lhs(left))
6511 type_t *type_left = skip_typeref(orig_type_left);
6512 type_t *type_right = skip_typeref(orig_type_right);
6514 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6515 /* TODO: improve error message */
6516 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6517 errorf(HERE, "operation needs arithmetic types");
6522 /* combined instructions are tricky. We can't create an implicit cast on
6523 * the left side, because we need the uncasted form for the store.
6524 * The ast2firm pass has to know that left_type must be right_type
6525 * for the arithmetic operation and create a cast by itself */
6526 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6527 expression->right = create_implicit_cast(right, arithmetic_type);
6528 expression->base.type = type_left;
6531 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
6533 expression_t *const left = expression->left;
6534 expression_t *const right = expression->right;
6535 type_t *const orig_type_left = left->base.type;
6536 type_t *const orig_type_right = right->base.type;
6537 type_t *const type_left = skip_typeref(orig_type_left);
6538 type_t *const type_right = skip_typeref(orig_type_right);
6540 if (!is_valid_assignment_lhs(left))
6543 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6544 /* combined instructions are tricky. We can't create an implicit cast on
6545 * the left side, because we need the uncasted form for the store.
6546 * The ast2firm pass has to know that left_type must be right_type
6547 * for the arithmetic operation and create a cast by itself */
6548 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
6549 expression->right = create_implicit_cast(right, arithmetic_type);
6550 expression->base.type = type_left;
6551 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6552 expression->base.type = type_left;
6553 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6554 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
6559 * Check the semantic restrictions of a logical expression.
6561 static void semantic_logical_op(binary_expression_t *expression)
6563 expression_t *const left = expression->left;
6564 expression_t *const right = expression->right;
6565 type_t *const orig_type_left = left->base.type;
6566 type_t *const orig_type_right = right->base.type;
6567 type_t *const type_left = skip_typeref(orig_type_left);
6568 type_t *const type_right = skip_typeref(orig_type_right);
6570 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
6571 /* TODO: improve error message */
6572 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6573 errorf(HERE, "operation needs scalar types");
6578 expression->base.type = type_int;
6582 * Check the semantic restrictions of a binary assign expression.
6584 static void semantic_binexpr_assign(binary_expression_t *expression)
6586 expression_t *left = expression->left;
6587 type_t *orig_type_left = left->base.type;
6589 type_t *type_left = revert_automatic_type_conversion(left);
6590 type_left = skip_typeref(orig_type_left);
6592 if (!is_valid_assignment_lhs(left))
6595 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
6596 "assignment", &left->base.source_position);
6597 if (res_type == NULL) {
6598 errorf(&expression->base.source_position,
6599 "cannot assign to '%T' from '%T'",
6600 orig_type_left, expression->right->base.type);
6602 expression->right = create_implicit_cast(expression->right, res_type);
6605 expression->base.type = orig_type_left;
6609 * Determine if the outermost operation (or parts thereof) of the given
6610 * expression has no effect in order to generate a warning about this fact.
6611 * Therefore in some cases this only examines some of the operands of the
6612 * expression (see comments in the function and examples below).
6614 * f() + 23; // warning, because + has no effect
6615 * x || f(); // no warning, because x controls execution of f()
6616 * x ? y : f(); // warning, because y has no effect
6617 * (void)x; // no warning to be able to suppress the warning
6618 * This function can NOT be used for an "expression has definitely no effect"-
6620 static bool expression_has_effect(const expression_t *const expr)
6622 switch (expr->kind) {
6623 case EXPR_UNKNOWN: break;
6624 case EXPR_INVALID: return true; /* do NOT warn */
6625 case EXPR_REFERENCE: return false;
6626 /* suppress the warning for microsoft __noop operations */
6627 case EXPR_CONST: return expr->conste.is_ms_noop;
6628 case EXPR_CHARACTER_CONSTANT: return false;
6629 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
6630 case EXPR_STRING_LITERAL: return false;
6631 case EXPR_WIDE_STRING_LITERAL: return false;
6634 const call_expression_t *const call = &expr->call;
6635 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
6638 switch (call->function->builtin_symbol.symbol->ID) {
6639 case T___builtin_va_end: return true;
6640 default: return false;
6644 /* Generate the warning if either the left or right hand side of a
6645 * conditional expression has no effect */
6646 case EXPR_CONDITIONAL: {
6647 const conditional_expression_t *const cond = &expr->conditional;
6649 expression_has_effect(cond->true_expression) &&
6650 expression_has_effect(cond->false_expression);
6653 case EXPR_SELECT: return false;
6654 case EXPR_ARRAY_ACCESS: return false;
6655 case EXPR_SIZEOF: return false;
6656 case EXPR_CLASSIFY_TYPE: return false;
6657 case EXPR_ALIGNOF: return false;
6659 case EXPR_FUNCNAME: return false;
6660 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
6661 case EXPR_BUILTIN_CONSTANT_P: return false;
6662 case EXPR_BUILTIN_PREFETCH: return true;
6663 case EXPR_OFFSETOF: return false;
6664 case EXPR_VA_START: return true;
6665 case EXPR_VA_ARG: return true;
6666 case EXPR_STATEMENT: return true; // TODO
6667 case EXPR_COMPOUND_LITERAL: return false;
6669 case EXPR_UNARY_NEGATE: return false;
6670 case EXPR_UNARY_PLUS: return false;
6671 case EXPR_UNARY_BITWISE_NEGATE: return false;
6672 case EXPR_UNARY_NOT: return false;
6673 case EXPR_UNARY_DEREFERENCE: return false;
6674 case EXPR_UNARY_TAKE_ADDRESS: return false;
6675 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
6676 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
6677 case EXPR_UNARY_PREFIX_INCREMENT: return true;
6678 case EXPR_UNARY_PREFIX_DECREMENT: return true;
6680 /* Treat void casts as if they have an effect in order to being able to
6681 * suppress the warning */
6682 case EXPR_UNARY_CAST: {
6683 type_t *const type = skip_typeref(expr->base.type);
6684 return is_type_atomic(type, ATOMIC_TYPE_VOID);
6687 case EXPR_UNARY_CAST_IMPLICIT: return true;
6688 case EXPR_UNARY_ASSUME: return true;
6690 case EXPR_BINARY_ADD: return false;
6691 case EXPR_BINARY_SUB: return false;
6692 case EXPR_BINARY_MUL: return false;
6693 case EXPR_BINARY_DIV: return false;
6694 case EXPR_BINARY_MOD: return false;
6695 case EXPR_BINARY_EQUAL: return false;
6696 case EXPR_BINARY_NOTEQUAL: return false;
6697 case EXPR_BINARY_LESS: return false;
6698 case EXPR_BINARY_LESSEQUAL: return false;
6699 case EXPR_BINARY_GREATER: return false;
6700 case EXPR_BINARY_GREATEREQUAL: return false;
6701 case EXPR_BINARY_BITWISE_AND: return false;
6702 case EXPR_BINARY_BITWISE_OR: return false;
6703 case EXPR_BINARY_BITWISE_XOR: return false;
6704 case EXPR_BINARY_SHIFTLEFT: return false;
6705 case EXPR_BINARY_SHIFTRIGHT: return false;
6706 case EXPR_BINARY_ASSIGN: return true;
6707 case EXPR_BINARY_MUL_ASSIGN: return true;
6708 case EXPR_BINARY_DIV_ASSIGN: return true;
6709 case EXPR_BINARY_MOD_ASSIGN: return true;
6710 case EXPR_BINARY_ADD_ASSIGN: return true;
6711 case EXPR_BINARY_SUB_ASSIGN: return true;
6712 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
6713 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
6714 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
6715 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
6716 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
6718 /* Only examine the right hand side of && and ||, because the left hand
6719 * side already has the effect of controlling the execution of the right
6721 case EXPR_BINARY_LOGICAL_AND:
6722 case EXPR_BINARY_LOGICAL_OR:
6723 /* Only examine the right hand side of a comma expression, because the left
6724 * hand side has a separate warning */
6725 case EXPR_BINARY_COMMA:
6726 return expression_has_effect(expr->binary.right);
6728 case EXPR_BINARY_BUILTIN_EXPECT: return true;
6729 case EXPR_BINARY_ISGREATER: return false;
6730 case EXPR_BINARY_ISGREATEREQUAL: return false;
6731 case EXPR_BINARY_ISLESS: return false;
6732 case EXPR_BINARY_ISLESSEQUAL: return false;
6733 case EXPR_BINARY_ISLESSGREATER: return false;
6734 case EXPR_BINARY_ISUNORDERED: return false;
6737 internal_errorf(HERE, "unexpected expression");
6740 static void semantic_comma(binary_expression_t *expression)
6742 if (warning.unused_value) {
6743 const expression_t *const left = expression->left;
6744 if (!expression_has_effect(left)) {
6745 warningf(&left->base.source_position,
6746 "left-hand operand of comma expression has no effect");
6749 expression->base.type = expression->right->base.type;
6752 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
6753 static expression_t *parse_##binexpression_type(unsigned precedence, \
6754 expression_t *left) \
6757 source_position_t pos = *HERE; \
6759 expression_t *right = parse_sub_expression(precedence + lr); \
6761 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
6762 binexpr->base.source_position = pos; \
6763 binexpr->binary.left = left; \
6764 binexpr->binary.right = right; \
6765 sfunc(&binexpr->binary); \
6770 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
6771 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
6772 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
6773 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
6774 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
6775 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
6776 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
6777 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
6778 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
6780 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
6781 semantic_comparison, 1)
6782 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
6783 semantic_comparison, 1)
6784 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
6785 semantic_comparison, 1)
6786 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
6787 semantic_comparison, 1)
6789 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
6790 semantic_binexpr_arithmetic, 1)
6791 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
6792 semantic_binexpr_arithmetic, 1)
6793 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
6794 semantic_binexpr_arithmetic, 1)
6795 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
6796 semantic_logical_op, 1)
6797 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
6798 semantic_logical_op, 1)
6799 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
6800 semantic_shift_op, 1)
6801 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
6802 semantic_shift_op, 1)
6803 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
6804 semantic_arithmetic_addsubb_assign, 0)
6805 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
6806 semantic_arithmetic_addsubb_assign, 0)
6807 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
6808 semantic_arithmetic_assign, 0)
6809 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
6810 semantic_arithmetic_assign, 0)
6811 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
6812 semantic_arithmetic_assign, 0)
6813 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
6814 semantic_arithmetic_assign, 0)
6815 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6816 semantic_arithmetic_assign, 0)
6817 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
6818 semantic_arithmetic_assign, 0)
6819 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
6820 semantic_arithmetic_assign, 0)
6821 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
6822 semantic_arithmetic_assign, 0)
6824 static expression_t *parse_sub_expression(unsigned precedence)
6826 if(token.type < 0) {
6827 return expected_expression_error();
6830 expression_parser_function_t *parser
6831 = &expression_parsers[token.type];
6832 source_position_t source_position = token.source_position;
6835 if(parser->parser != NULL) {
6836 left = parser->parser(parser->precedence);
6838 left = parse_primary_expression();
6840 assert(left != NULL);
6841 left->base.source_position = source_position;
6844 if(token.type < 0) {
6845 return expected_expression_error();
6848 parser = &expression_parsers[token.type];
6849 if(parser->infix_parser == NULL)
6851 if(parser->infix_precedence < precedence)
6854 left = parser->infix_parser(parser->infix_precedence, left);
6856 assert(left != NULL);
6857 assert(left->kind != EXPR_UNKNOWN);
6858 left->base.source_position = source_position;
6865 * Parse an expression.
6867 static expression_t *parse_expression(void)
6869 return parse_sub_expression(1);
6873 * Register a parser for a prefix-like operator with given precedence.
6875 * @param parser the parser function
6876 * @param token_type the token type of the prefix token
6877 * @param precedence the precedence of the operator
6879 static void register_expression_parser(parse_expression_function parser,
6880 int token_type, unsigned precedence)
6882 expression_parser_function_t *entry = &expression_parsers[token_type];
6884 if(entry->parser != NULL) {
6885 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6886 panic("trying to register multiple expression parsers for a token");
6888 entry->parser = parser;
6889 entry->precedence = precedence;
6893 * Register a parser for an infix operator with given precedence.
6895 * @param parser the parser function
6896 * @param token_type the token type of the infix operator
6897 * @param precedence the precedence of the operator
6899 static void register_infix_parser(parse_expression_infix_function parser,
6900 int token_type, unsigned precedence)
6902 expression_parser_function_t *entry = &expression_parsers[token_type];
6904 if(entry->infix_parser != NULL) {
6905 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6906 panic("trying to register multiple infix expression parsers for a "
6909 entry->infix_parser = parser;
6910 entry->infix_precedence = precedence;
6914 * Initialize the expression parsers.
6916 static void init_expression_parsers(void)
6918 memset(&expression_parsers, 0, sizeof(expression_parsers));
6920 register_infix_parser(parse_array_expression, '[', 30);
6921 register_infix_parser(parse_call_expression, '(', 30);
6922 register_infix_parser(parse_select_expression, '.', 30);
6923 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
6924 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
6926 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
6929 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
6930 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
6931 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
6932 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
6933 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
6934 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
6935 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
6936 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
6937 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
6938 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
6939 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
6940 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
6941 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
6942 T_EXCLAMATIONMARKEQUAL, 13);
6943 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
6944 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
6945 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
6946 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
6947 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
6948 register_infix_parser(parse_conditional_expression, '?', 7);
6949 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
6950 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
6951 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
6952 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
6953 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
6954 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
6955 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
6956 T_LESSLESSEQUAL, 2);
6957 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6958 T_GREATERGREATEREQUAL, 2);
6959 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
6961 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
6963 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
6966 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
6968 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
6969 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
6970 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
6971 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
6972 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
6973 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
6974 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
6976 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
6978 register_expression_parser(parse_sizeof, T_sizeof, 25);
6979 register_expression_parser(parse_alignof, T___alignof__, 25);
6980 register_expression_parser(parse_extension, T___extension__, 25);
6981 register_expression_parser(parse_builtin_classify_type,
6982 T___builtin_classify_type, 25);
6986 * Parse a asm statement constraints specification.
6988 static asm_constraint_t *parse_asm_constraints(void)
6990 asm_constraint_t *result = NULL;
6991 asm_constraint_t *last = NULL;
6993 while(token.type == T_STRING_LITERAL || token.type == '[') {
6994 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
6995 memset(constraint, 0, sizeof(constraint[0]));
6997 if(token.type == '[') {
6999 if(token.type != T_IDENTIFIER) {
7000 parse_error_expected("while parsing asm constraint",
7001 T_IDENTIFIER, NULL);
7004 constraint->symbol = token.v.symbol;
7009 constraint->constraints = parse_string_literals();
7011 constraint->expression = parse_expression();
7015 last->next = constraint;
7017 result = constraint;
7021 if(token.type != ',')
7032 * Parse a asm statement clobber specification.
7034 static asm_clobber_t *parse_asm_clobbers(void)
7036 asm_clobber_t *result = NULL;
7037 asm_clobber_t *last = NULL;
7039 while(token.type == T_STRING_LITERAL) {
7040 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
7041 clobber->clobber = parse_string_literals();
7044 last->next = clobber;
7050 if(token.type != ',')
7059 * Parse an asm statement.
7061 static statement_t *parse_asm_statement(void)
7065 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7066 statement->base.source_position = token.source_position;
7068 asm_statement_t *asm_statement = &statement->asms;
7070 if(token.type == T_volatile) {
7072 asm_statement->is_volatile = true;
7076 add_anchor_token(')');
7077 add_anchor_token(':');
7078 asm_statement->asm_text = parse_string_literals();
7080 if(token.type != ':') {
7081 rem_anchor_token(':');
7086 asm_statement->inputs = parse_asm_constraints();
7087 if(token.type != ':') {
7088 rem_anchor_token(':');
7093 asm_statement->outputs = parse_asm_constraints();
7094 if(token.type != ':') {
7095 rem_anchor_token(':');
7098 rem_anchor_token(':');
7101 asm_statement->clobbers = parse_asm_clobbers();
7104 rem_anchor_token(')');
7109 return create_invalid_statement();
7113 * Parse a case statement.
7115 static statement_t *parse_case_statement(void)
7119 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7121 statement->base.source_position = token.source_position;
7122 statement->case_label.expression = parse_expression();
7124 if (c_mode & _GNUC) {
7125 if (token.type == T_DOTDOTDOT) {
7127 statement->case_label.end_range = parse_expression();
7133 if (! is_constant_expression(statement->case_label.expression)) {
7134 errorf(&statement->base.source_position,
7135 "case label does not reduce to an integer constant");
7137 /* TODO: check if the case label is already known */
7138 if (current_switch != NULL) {
7139 /* link all cases into the switch statement */
7140 if (current_switch->last_case == NULL) {
7141 current_switch->first_case =
7142 current_switch->last_case = &statement->case_label;
7144 current_switch->last_case->next = &statement->case_label;
7147 errorf(&statement->base.source_position,
7148 "case label not within a switch statement");
7151 statement->case_label.statement = parse_statement();
7155 return create_invalid_statement();
7159 * Finds an existing default label of a switch statement.
7161 static case_label_statement_t *
7162 find_default_label(const switch_statement_t *statement)
7164 case_label_statement_t *label = statement->first_case;
7165 for ( ; label != NULL; label = label->next) {
7166 if (label->expression == NULL)
7173 * Parse a default statement.
7175 static statement_t *parse_default_statement(void)
7179 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7181 statement->base.source_position = token.source_position;
7184 if (current_switch != NULL) {
7185 const case_label_statement_t *def_label = find_default_label(current_switch);
7186 if (def_label != NULL) {
7187 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7188 &def_label->base.source_position);
7190 /* link all cases into the switch statement */
7191 if (current_switch->last_case == NULL) {
7192 current_switch->first_case =
7193 current_switch->last_case = &statement->case_label;
7195 current_switch->last_case->next = &statement->case_label;
7199 errorf(&statement->base.source_position,
7200 "'default' label not within a switch statement");
7202 statement->case_label.statement = parse_statement();
7206 return create_invalid_statement();
7210 * Return the declaration for a given label symbol or create a new one.
7212 static declaration_t *get_label(symbol_t *symbol)
7214 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7215 assert(current_function != NULL);
7216 /* if we found a label in the same function, then we already created the
7218 if(candidate != NULL
7219 && candidate->parent_scope == ¤t_function->scope) {
7223 /* otherwise we need to create a new one */
7224 declaration_t *const declaration = allocate_declaration_zero();
7225 declaration->namespc = NAMESPACE_LABEL;
7226 declaration->symbol = symbol;
7228 label_push(declaration);
7234 * Parse a label statement.
7236 static statement_t *parse_label_statement(void)
7238 assert(token.type == T_IDENTIFIER);
7239 symbol_t *symbol = token.v.symbol;
7242 declaration_t *label = get_label(symbol);
7244 /* if source position is already set then the label is defined twice,
7245 * otherwise it was just mentioned in a goto so far */
7246 if(label->source_position.input_name != NULL) {
7247 errorf(HERE, "duplicate label '%Y' (declared %P)",
7248 symbol, &label->source_position);
7250 label->source_position = token.source_position;
7253 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7255 statement->base.source_position = token.source_position;
7256 statement->label.label = label;
7260 if(token.type == '}') {
7261 /* TODO only warn? */
7263 warningf(HERE, "label at end of compound statement");
7264 statement->label.statement = create_empty_statement();
7266 errorf(HERE, "label at end of compound statement");
7267 statement->label.statement = create_invalid_statement();
7271 if (token.type == ';') {
7272 /* eat an empty statement here, to avoid the warning about an empty
7273 * after a label. label:; is commonly used to have a label before
7275 statement->label.statement = create_empty_statement();
7278 statement->label.statement = parse_statement();
7282 /* remember the labels's in a list for later checking */
7283 if (label_last == NULL) {
7284 label_first = &statement->label;
7286 label_last->next = &statement->label;
7288 label_last = &statement->label;
7294 * Parse an if statement.
7296 static statement_t *parse_if(void)
7300 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7301 statement->base.source_position = token.source_position;
7304 add_anchor_token(')');
7305 statement->ifs.condition = parse_expression();
7306 rem_anchor_token(')');
7309 add_anchor_token(T_else);
7310 statement->ifs.true_statement = parse_statement();
7311 rem_anchor_token(T_else);
7313 if(token.type == T_else) {
7315 statement->ifs.false_statement = parse_statement();
7320 return create_invalid_statement();
7324 * Parse a switch statement.
7326 static statement_t *parse_switch(void)
7330 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7331 statement->base.source_position = token.source_position;
7334 expression_t *const expr = parse_expression();
7335 type_t * type = skip_typeref(expr->base.type);
7336 if (is_type_integer(type)) {
7337 type = promote_integer(type);
7338 } else if (is_type_valid(type)) {
7339 errorf(&expr->base.source_position,
7340 "switch quantity is not an integer, but '%T'", type);
7341 type = type_error_type;
7343 statement->switchs.expression = create_implicit_cast(expr, type);
7346 switch_statement_t *rem = current_switch;
7347 current_switch = &statement->switchs;
7348 statement->switchs.body = parse_statement();
7349 current_switch = rem;
7351 if(warning.switch_default &&
7352 find_default_label(&statement->switchs) == NULL) {
7353 warningf(&statement->base.source_position, "switch has no default case");
7358 return create_invalid_statement();
7361 static statement_t *parse_loop_body(statement_t *const loop)
7363 statement_t *const rem = current_loop;
7364 current_loop = loop;
7366 statement_t *const body = parse_statement();
7373 * Parse a while statement.
7375 static statement_t *parse_while(void)
7379 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7380 statement->base.source_position = token.source_position;
7383 add_anchor_token(')');
7384 statement->whiles.condition = parse_expression();
7385 rem_anchor_token(')');
7388 statement->whiles.body = parse_loop_body(statement);
7392 return create_invalid_statement();
7396 * Parse a do statement.
7398 static statement_t *parse_do(void)
7402 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7404 statement->base.source_position = token.source_position;
7406 add_anchor_token(T_while);
7407 statement->do_while.body = parse_loop_body(statement);
7408 rem_anchor_token(T_while);
7412 add_anchor_token(')');
7413 statement->do_while.condition = parse_expression();
7414 rem_anchor_token(')');
7420 return create_invalid_statement();
7424 * Parse a for statement.
7426 static statement_t *parse_for(void)
7430 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7431 statement->base.source_position = token.source_position;
7433 int top = environment_top();
7434 scope_t *last_scope = scope;
7435 set_scope(&statement->fors.scope);
7438 add_anchor_token(')');
7440 if(token.type != ';') {
7441 if(is_declaration_specifier(&token, false)) {
7442 parse_declaration(record_declaration);
7444 add_anchor_token(';');
7445 expression_t *const init = parse_expression();
7446 statement->fors.initialisation = init;
7447 if (warning.unused_value && !expression_has_effect(init)) {
7448 warningf(&init->base.source_position,
7449 "initialisation of 'for'-statement has no effect");
7451 rem_anchor_token(';');
7458 if(token.type != ';') {
7459 add_anchor_token(';');
7460 statement->fors.condition = parse_expression();
7461 rem_anchor_token(';');
7464 if(token.type != ')') {
7465 expression_t *const step = parse_expression();
7466 statement->fors.step = step;
7467 if (warning.unused_value && !expression_has_effect(step)) {
7468 warningf(&step->base.source_position,
7469 "step of 'for'-statement has no effect");
7472 rem_anchor_token(')');
7474 statement->fors.body = parse_loop_body(statement);
7476 assert(scope == &statement->fors.scope);
7477 set_scope(last_scope);
7478 environment_pop_to(top);
7483 rem_anchor_token(')');
7484 assert(scope == &statement->fors.scope);
7485 set_scope(last_scope);
7486 environment_pop_to(top);
7488 return create_invalid_statement();
7492 * Parse a goto statement.
7494 static statement_t *parse_goto(void)
7498 if(token.type != T_IDENTIFIER) {
7499 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
7503 symbol_t *symbol = token.v.symbol;
7506 declaration_t *label = get_label(symbol);
7508 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
7509 statement->base.source_position = token.source_position;
7511 statement->gotos.label = label;
7513 /* remember the goto's in a list for later checking */
7514 if (goto_last == NULL) {
7515 goto_first = &statement->gotos;
7517 goto_last->next = &statement->gotos;
7519 goto_last = &statement->gotos;
7525 return create_invalid_statement();
7529 * Parse a continue statement.
7531 static statement_t *parse_continue(void)
7533 statement_t *statement;
7534 if (current_loop == NULL) {
7535 errorf(HERE, "continue statement not within loop");
7536 statement = create_invalid_statement();
7538 statement = allocate_statement_zero(STATEMENT_CONTINUE);
7540 statement->base.source_position = token.source_position;
7548 return create_invalid_statement();
7552 * Parse a break statement.
7554 static statement_t *parse_break(void)
7556 statement_t *statement;
7557 if (current_switch == NULL && current_loop == NULL) {
7558 errorf(HERE, "break statement not within loop or switch");
7559 statement = create_invalid_statement();
7561 statement = allocate_statement_zero(STATEMENT_BREAK);
7563 statement->base.source_position = token.source_position;
7571 return create_invalid_statement();
7575 * Parse a __leave statement.
7577 static statement_t *parse_leave(void)
7579 statement_t *statement;
7580 if (current_try == NULL) {
7581 errorf(HERE, "__leave statement not within __try");
7582 statement = create_invalid_statement();
7584 statement = allocate_statement_zero(STATEMENT_LEAVE);
7586 statement->base.source_position = token.source_position;
7594 return create_invalid_statement();
7598 * Check if a given declaration represents a local variable.
7600 static bool is_local_var_declaration(const declaration_t *declaration) {
7601 switch ((storage_class_tag_t) declaration->storage_class) {
7602 case STORAGE_CLASS_AUTO:
7603 case STORAGE_CLASS_REGISTER: {
7604 const type_t *type = skip_typeref(declaration->type);
7605 if(is_type_function(type)) {
7617 * Check if a given declaration represents a variable.
7619 static bool is_var_declaration(const declaration_t *declaration) {
7620 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF)
7623 const type_t *type = skip_typeref(declaration->type);
7624 return !is_type_function(type);
7628 * Check if a given expression represents a local variable.
7630 static bool is_local_variable(const expression_t *expression)
7632 if (expression->base.kind != EXPR_REFERENCE) {
7635 const declaration_t *declaration = expression->reference.declaration;
7636 return is_local_var_declaration(declaration);
7640 * Check if a given expression represents a local variable and
7641 * return its declaration then, else return NULL.
7643 declaration_t *expr_is_variable(const expression_t *expression)
7645 if (expression->base.kind != EXPR_REFERENCE) {
7648 declaration_t *declaration = expression->reference.declaration;
7649 if (is_var_declaration(declaration))
7655 * Parse a return statement.
7657 static statement_t *parse_return(void)
7659 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
7660 statement->base.source_position = token.source_position;
7664 expression_t *return_value = NULL;
7665 if(token.type != ';') {
7666 return_value = parse_expression();
7670 const type_t *const func_type = current_function->type;
7671 assert(is_type_function(func_type));
7672 type_t *const return_type = skip_typeref(func_type->function.return_type);
7674 if(return_value != NULL) {
7675 type_t *return_value_type = skip_typeref(return_value->base.type);
7677 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
7678 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
7679 warningf(&statement->base.source_position,
7680 "'return' with a value, in function returning void");
7681 return_value = NULL;
7683 type_t *const res_type = semantic_assign(return_type,
7684 return_value, "'return'", &statement->base.source_position);
7685 if (res_type == NULL) {
7686 errorf(&statement->base.source_position,
7687 "cannot return something of type '%T' in function returning '%T'",
7688 return_value->base.type, return_type);
7690 return_value = create_implicit_cast(return_value, res_type);
7693 /* check for returning address of a local var */
7694 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
7695 const expression_t *expression = return_value->unary.value;
7696 if (is_local_variable(expression)) {
7697 warningf(&statement->base.source_position,
7698 "function returns address of local variable");
7702 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
7703 warningf(&statement->base.source_position,
7704 "'return' without value, in function returning non-void");
7707 statement->returns.value = return_value;
7711 return create_invalid_statement();
7715 * Parse a declaration statement.
7717 static statement_t *parse_declaration_statement(void)
7719 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
7721 statement->base.source_position = token.source_position;
7723 declaration_t *before = last_declaration;
7724 parse_declaration(record_declaration);
7726 if(before == NULL) {
7727 statement->declaration.declarations_begin = scope->declarations;
7729 statement->declaration.declarations_begin = before->next;
7731 statement->declaration.declarations_end = last_declaration;
7737 * Parse an expression statement, ie. expr ';'.
7739 static statement_t *parse_expression_statement(void)
7741 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
7743 statement->base.source_position = token.source_position;
7744 expression_t *const expr = parse_expression();
7745 statement->expression.expression = expr;
7751 return create_invalid_statement();
7755 * Parse a microsoft __try { } __finally { } or
7756 * __try{ } __except() { }
7758 static statement_t *parse_ms_try_statment(void) {
7759 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
7761 statement->base.source_position = token.source_position;
7764 ms_try_statement_t *rem = current_try;
7765 current_try = &statement->ms_try;
7766 statement->ms_try.try_statement = parse_compound_statement(false);
7769 if(token.type == T___except) {
7772 add_anchor_token(')');
7773 expression_t *const expr = parse_expression();
7774 type_t * type = skip_typeref(expr->base.type);
7775 if (is_type_integer(type)) {
7776 type = promote_integer(type);
7777 } else if (is_type_valid(type)) {
7778 errorf(&expr->base.source_position,
7779 "__expect expression is not an integer, but '%T'", type);
7780 type = type_error_type;
7782 statement->ms_try.except_expression = create_implicit_cast(expr, type);
7783 rem_anchor_token(')');
7785 statement->ms_try.final_statement = parse_compound_statement(false);
7786 } else if(token.type == T__finally) {
7788 statement->ms_try.final_statement = parse_compound_statement(false);
7790 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
7791 return create_invalid_statement();
7795 return create_invalid_statement();
7799 * Parse a statement.
7800 * There's also parse_statement() which additionally checks for
7801 * "statement has no effect" warnings
7803 static statement_t *intern_parse_statement(void)
7805 statement_t *statement = NULL;
7807 /* declaration or statement */
7808 add_anchor_token(';');
7809 switch(token.type) {
7811 statement = parse_asm_statement();
7815 statement = parse_case_statement();
7819 statement = parse_default_statement();
7823 statement = parse_compound_statement(false);
7827 statement = parse_if();
7831 statement = parse_switch();
7835 statement = parse_while();
7839 statement = parse_do();
7843 statement = parse_for();
7847 statement = parse_goto();
7851 statement = parse_continue();
7855 statement = parse_break();
7859 statement = parse_leave();
7863 statement = parse_return();
7867 if(warning.empty_statement) {
7868 warningf(HERE, "statement is empty");
7870 statement = create_empty_statement();
7875 if(look_ahead(1)->type == ':') {
7876 statement = parse_label_statement();
7880 if(is_typedef_symbol(token.v.symbol)) {
7881 statement = parse_declaration_statement();
7885 statement = parse_expression_statement();
7888 case T___extension__:
7889 /* this can be a prefix to a declaration or an expression statement */
7890 /* we simply eat it now and parse the rest with tail recursion */
7893 } while(token.type == T___extension__);
7894 statement = parse_statement();
7898 statement = parse_declaration_statement();
7902 statement = parse_ms_try_statment();
7906 statement = parse_expression_statement();
7909 rem_anchor_token(';');
7911 assert(statement != NULL
7912 && statement->base.source_position.input_name != NULL);
7918 * parse a statement and emits "statement has no effect" warning if needed
7919 * (This is really a wrapper around intern_parse_statement with check for 1
7920 * single warning. It is needed, because for statement expressions we have
7921 * to avoid the warning on the last statement)
7923 static statement_t *parse_statement(void)
7925 statement_t *statement = intern_parse_statement();
7927 if(statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
7928 expression_t *expression = statement->expression.expression;
7929 if(!expression_has_effect(expression)) {
7930 warningf(&expression->base.source_position,
7931 "statement has no effect");
7939 * Parse a compound statement.
7941 static statement_t *parse_compound_statement(bool inside_expression_statement)
7943 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
7945 statement->base.source_position = token.source_position;
7948 add_anchor_token('}');
7950 int top = environment_top();
7951 scope_t *last_scope = scope;
7952 set_scope(&statement->compound.scope);
7954 statement_t *last_statement = NULL;
7956 while(token.type != '}' && token.type != T_EOF) {
7957 statement_t *sub_statement = intern_parse_statement();
7958 if(is_invalid_statement(sub_statement)) {
7959 /* an error occurred. if we are at an anchor, return */
7965 if(last_statement != NULL) {
7966 last_statement->base.next = sub_statement;
7968 statement->compound.statements = sub_statement;
7971 while(sub_statement->base.next != NULL)
7972 sub_statement = sub_statement->base.next;
7974 last_statement = sub_statement;
7977 if(token.type == '}') {
7980 errorf(&statement->base.source_position,
7981 "end of file while looking for closing '}'");
7984 /* look over all statements again to produce no effect warnings */
7985 if(warning.unused_value) {
7986 statement_t *sub_statement = statement->compound.statements;
7987 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
7988 if(sub_statement->kind != STATEMENT_EXPRESSION)
7990 /* don't emit a warning for the last expression in an expression
7991 * statement as it has always an effect */
7992 if(inside_expression_statement && sub_statement->base.next == NULL)
7995 expression_t *expression = sub_statement->expression.expression;
7996 if(!expression_has_effect(expression)) {
7997 warningf(&expression->base.source_position,
7998 "statement has no effect");
8004 rem_anchor_token('}');
8005 assert(scope == &statement->compound.scope);
8006 set_scope(last_scope);
8007 environment_pop_to(top);
8013 * Initialize builtin types.
8015 static void initialize_builtin_types(void)
8017 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
8018 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
8019 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
8020 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
8021 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
8022 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
8023 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
8024 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
8026 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
8027 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
8028 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
8029 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
8033 * Check for unused global static functions and variables
8035 static void check_unused_globals(void)
8037 if (!warning.unused_function && !warning.unused_variable)
8040 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
8041 if (decl->used || decl->storage_class != STORAGE_CLASS_STATIC)
8044 type_t *const type = decl->type;
8046 if (is_type_function(skip_typeref(type))) {
8047 if (!warning.unused_function || decl->is_inline)
8050 s = (decl->init.statement != NULL ? "defined" : "declared");
8052 if (!warning.unused_variable)
8058 warningf(&decl->source_position, "'%#T' %s but not used",
8059 type, decl->symbol, s);
8064 * Parse a translation unit.
8066 static translation_unit_t *parse_translation_unit(void)
8068 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
8070 assert(global_scope == NULL);
8071 global_scope = &unit->scope;
8073 assert(scope == NULL);
8074 set_scope(&unit->scope);
8076 initialize_builtin_types();
8078 while(token.type != T_EOF) {
8079 if (token.type == ';') {
8080 /* TODO error in strict mode */
8081 warningf(HERE, "stray ';' outside of function");
8084 parse_external_declaration();
8088 assert(scope == &unit->scope);
8090 last_declaration = NULL;
8092 assert(global_scope == &unit->scope);
8093 check_unused_globals();
8094 global_scope = NULL;
8102 * @return the translation unit or NULL if errors occurred.
8104 translation_unit_t *parse(void)
8106 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8107 label_stack = NEW_ARR_F(stack_entry_t, 0);
8108 diagnostic_count = 0;
8112 type_set_output(stderr);
8113 ast_set_output(stderr);
8115 lookahead_bufpos = 0;
8116 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8119 translation_unit_t *unit = parse_translation_unit();
8121 DEL_ARR_F(environment_stack);
8122 DEL_ARR_F(label_stack);
8128 * Initialize the parser.
8130 void init_parser(void)
8133 /* add predefined symbols for extended-decl-modifier */
8134 sym_align = symbol_table_insert("align");
8135 sym_allocate = symbol_table_insert("allocate");
8136 sym_dllimport = symbol_table_insert("dllimport");
8137 sym_dllexport = symbol_table_insert("dllexport");
8138 sym_naked = symbol_table_insert("naked");
8139 sym_noinline = symbol_table_insert("noinline");
8140 sym_noreturn = symbol_table_insert("noreturn");
8141 sym_nothrow = symbol_table_insert("nothrow");
8142 sym_novtable = symbol_table_insert("novtable");
8143 sym_property = symbol_table_insert("property");
8144 sym_get = symbol_table_insert("get");
8145 sym_put = symbol_table_insert("put");
8146 sym_selectany = symbol_table_insert("selectany");
8147 sym_thread = symbol_table_insert("thread");
8148 sym_uuid = symbol_table_insert("uuid");
8149 sym_deprecated = symbol_table_insert("deprecated");
8150 sym_restrict = symbol_table_insert("restrict");
8151 sym_noalias = symbol_table_insert("noalias");
8153 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8155 init_expression_parsers();
8156 obstack_init(&temp_obst);
8158 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8159 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8163 * Terminate the parser.
8165 void exit_parser(void)
8167 obstack_free(&temp_obst, NULL);