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 argument_list_t argument_list_t;
52 struct argument_list_t {
54 argument_list_t *next;
57 typedef struct gnu_attribute_t gnu_attribute_t;
58 struct gnu_attribute_t {
59 gnu_attribute_kind_t kind; /**< The kind of the GNU attribute. */
60 gnu_attribute_t *next;
61 bool invalid; /**< Set if this attribute had argument errors, */
62 bool have_arguments; /**< True, if this attribute has arguments. */
66 atomic_type_kind_t akind;
67 long argument; /**< Single argument. */
68 argument_list_t *arguments; /**< List of argument expressions. */
72 typedef struct declaration_specifiers_t declaration_specifiers_t;
73 struct declaration_specifiers_t {
74 source_position_t source_position;
75 unsigned char declared_storage_class;
76 unsigned char alignment; /**< Alignment, 0 if not set. */
77 unsigned int is_inline : 1;
78 unsigned int deprecated : 1;
79 decl_modifiers_t modifiers; /**< declaration modifiers */
80 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
81 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
82 symbol_t *get_property_sym; /**< the name of the get property if set. */
83 symbol_t *put_property_sym; /**< the name of the put property if set. */
88 * An environment for parsing initializers (and compound literals).
90 typedef struct parse_initializer_env_t {
91 type_t *type; /**< the type of the initializer. In case of an
92 array type with unspecified size this gets
93 adjusted to the actual size. */
94 declaration_t *declaration; /**< the declaration that is initialized if any */
95 bool must_be_constant;
96 } parse_initializer_env_t;
98 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
100 static token_t token;
101 static token_t lookahead_buffer[MAX_LOOKAHEAD];
102 static int lookahead_bufpos;
103 static stack_entry_t *environment_stack = NULL;
104 static stack_entry_t *label_stack = NULL;
105 static scope_t *global_scope = NULL;
106 static scope_t *scope = NULL;
107 static declaration_t *last_declaration = NULL;
108 static declaration_t *current_function = NULL;
109 static switch_statement_t *current_switch = NULL;
110 static statement_t *current_loop = NULL;
111 static ms_try_statement_t *current_try = NULL;
112 static goto_statement_t *goto_first = NULL;
113 static goto_statement_t *goto_last = NULL;
114 static label_statement_t *label_first = NULL;
115 static label_statement_t *label_last = NULL;
116 static translation_unit_t *unit = NULL;
117 static struct obstack temp_obst;
119 static source_position_t null_position = { NULL, 0 };
121 /* symbols for Microsoft extended-decl-modifier */
122 static const symbol_t *sym_align = NULL;
123 static const symbol_t *sym_allocate = NULL;
124 static const symbol_t *sym_dllimport = NULL;
125 static const symbol_t *sym_dllexport = NULL;
126 static const symbol_t *sym_naked = NULL;
127 static const symbol_t *sym_noinline = NULL;
128 static const symbol_t *sym_noreturn = NULL;
129 static const symbol_t *sym_nothrow = NULL;
130 static const symbol_t *sym_novtable = NULL;
131 static const symbol_t *sym_property = NULL;
132 static const symbol_t *sym_get = NULL;
133 static const symbol_t *sym_put = NULL;
134 static const symbol_t *sym_selectany = NULL;
135 static const symbol_t *sym_thread = NULL;
136 static const symbol_t *sym_uuid = NULL;
137 static const symbol_t *sym_deprecated = NULL;
138 static const symbol_t *sym_restrict = NULL;
139 static const symbol_t *sym_noalias = NULL;
141 /** The token anchor set */
142 static unsigned char token_anchor_set[T_LAST_TOKEN];
144 /** The current source position. */
145 #define HERE (&token.source_position)
147 static type_t *type_valist;
149 static statement_t *parse_compound_statement(bool inside_expression_statement);
150 static statement_t *parse_statement(void);
152 static expression_t *parse_sub_expression(unsigned precedence);
153 static expression_t *parse_expression(void);
154 static type_t *parse_typename(void);
156 static void parse_compound_type_entries(declaration_t *compound_declaration);
157 static declaration_t *parse_declarator(
158 const declaration_specifiers_t *specifiers, bool may_be_abstract);
159 static declaration_t *record_declaration(declaration_t *declaration);
161 static void semantic_comparison(binary_expression_t *expression);
163 #define STORAGE_CLASSES \
171 #define TYPE_QUALIFIERS \
176 case T__forceinline: \
177 case T___attribute__:
179 #ifdef PROVIDE_COMPLEX
180 #define COMPLEX_SPECIFIERS \
182 #define IMAGINARY_SPECIFIERS \
185 #define COMPLEX_SPECIFIERS
186 #define IMAGINARY_SPECIFIERS
189 #define TYPE_SPECIFIERS \
204 case T___builtin_va_list: \
209 #define DECLARATION_START \
214 #define TYPENAME_START \
219 * Allocate an AST node with given size and
220 * initialize all fields with zero.
222 static void *allocate_ast_zero(size_t size)
224 void *res = allocate_ast(size);
225 memset(res, 0, size);
229 static declaration_t *allocate_declaration_zero(void)
231 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
232 declaration->type = type_error_type;
233 declaration->alignment = 0;
238 * Returns the size of a statement node.
240 * @param kind the statement kind
242 static size_t get_statement_struct_size(statement_kind_t kind)
244 static const size_t sizes[] = {
245 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
246 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
247 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
248 [STATEMENT_RETURN] = sizeof(return_statement_t),
249 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
250 [STATEMENT_IF] = sizeof(if_statement_t),
251 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
252 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
253 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
254 [STATEMENT_BREAK] = sizeof(statement_base_t),
255 [STATEMENT_GOTO] = sizeof(goto_statement_t),
256 [STATEMENT_LABEL] = sizeof(label_statement_t),
257 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
258 [STATEMENT_WHILE] = sizeof(while_statement_t),
259 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
260 [STATEMENT_FOR] = sizeof(for_statement_t),
261 [STATEMENT_ASM] = sizeof(asm_statement_t),
262 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
263 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
265 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
266 assert(sizes[kind] != 0);
271 * Returns the size of an expression node.
273 * @param kind the expression kind
275 static size_t get_expression_struct_size(expression_kind_t kind)
277 static const size_t sizes[] = {
278 [EXPR_INVALID] = sizeof(expression_base_t),
279 [EXPR_REFERENCE] = sizeof(reference_expression_t),
280 [EXPR_CONST] = sizeof(const_expression_t),
281 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
282 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
283 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
284 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
285 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
286 [EXPR_CALL] = sizeof(call_expression_t),
287 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
288 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
289 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
290 [EXPR_SELECT] = sizeof(select_expression_t),
291 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
292 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
293 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
294 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
295 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
296 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
297 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
298 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
299 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
300 [EXPR_VA_START] = sizeof(va_start_expression_t),
301 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
302 [EXPR_STATEMENT] = sizeof(statement_expression_t),
304 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
305 return sizes[EXPR_UNARY_FIRST];
307 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
308 return sizes[EXPR_BINARY_FIRST];
310 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
311 assert(sizes[kind] != 0);
316 * Allocate a statement node of given kind and initialize all
319 static statement_t *allocate_statement_zero(statement_kind_t kind)
321 size_t size = get_statement_struct_size(kind);
322 statement_t *res = allocate_ast_zero(size);
324 res->base.kind = kind;
329 * Allocate an expression node of given kind and initialize all
332 static expression_t *allocate_expression_zero(expression_kind_t kind)
334 size_t size = get_expression_struct_size(kind);
335 expression_t *res = allocate_ast_zero(size);
337 res->base.kind = kind;
338 res->base.type = type_error_type;
343 * Creates a new invalid expression.
345 static expression_t *create_invalid_expression(void)
347 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
348 expression->base.source_position = token.source_position;
353 * Creates a new invalid statement.
355 static statement_t *create_invalid_statement(void)
357 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
358 statement->base.source_position = token.source_position;
363 * Allocate a new empty statement.
365 static statement_t *create_empty_statement(void)
367 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
368 statement->base.source_position = token.source_position;
373 * Returns the size of a type node.
375 * @param kind the type kind
377 static size_t get_type_struct_size(type_kind_t kind)
379 static const size_t sizes[] = {
380 [TYPE_ATOMIC] = sizeof(atomic_type_t),
381 [TYPE_COMPLEX] = sizeof(complex_type_t),
382 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
383 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
384 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
385 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
386 [TYPE_ENUM] = sizeof(enum_type_t),
387 [TYPE_FUNCTION] = sizeof(function_type_t),
388 [TYPE_POINTER] = sizeof(pointer_type_t),
389 [TYPE_ARRAY] = sizeof(array_type_t),
390 [TYPE_BUILTIN] = sizeof(builtin_type_t),
391 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
392 [TYPE_TYPEOF] = sizeof(typeof_type_t),
394 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
395 assert(kind <= TYPE_TYPEOF);
396 assert(sizes[kind] != 0);
401 * Allocate a type node of given kind and initialize all
404 * @param kind type kind to allocate
405 * @param source_position the source position of the type definition
407 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
409 size_t size = get_type_struct_size(kind);
410 type_t *res = obstack_alloc(type_obst, size);
411 memset(res, 0, size);
413 res->base.kind = kind;
414 res->base.source_position = *source_position;
419 * Returns the size of an initializer node.
421 * @param kind the initializer kind
423 static size_t get_initializer_size(initializer_kind_t kind)
425 static const size_t sizes[] = {
426 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
427 [INITIALIZER_STRING] = sizeof(initializer_string_t),
428 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
429 [INITIALIZER_LIST] = sizeof(initializer_list_t),
430 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
432 assert(kind < sizeof(sizes) / sizeof(*sizes));
433 assert(sizes[kind] != 0);
438 * Allocate an initializer node of given kind and initialize all
441 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
443 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
450 * Free a type from the type obstack.
452 static void free_type(void *type)
454 obstack_free(type_obst, type);
458 * Returns the index of the top element of the environment stack.
460 static size_t environment_top(void)
462 return ARR_LEN(environment_stack);
466 * Returns the index of the top element of the label stack.
468 static size_t label_top(void)
470 return ARR_LEN(label_stack);
474 * Return the next token.
476 static inline void next_token(void)
478 token = lookahead_buffer[lookahead_bufpos];
479 lookahead_buffer[lookahead_bufpos] = lexer_token;
482 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
485 print_token(stderr, &token);
486 fprintf(stderr, "\n");
491 * Return the next token with a given lookahead.
493 static inline const token_t *look_ahead(int num)
495 assert(num > 0 && num <= MAX_LOOKAHEAD);
496 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
497 return &lookahead_buffer[pos];
501 * Adds a token to the token anchor set (a multi-set).
503 static void add_anchor_token(int token_type)
505 assert(0 <= token_type && token_type < T_LAST_TOKEN);
506 ++token_anchor_set[token_type];
509 static int save_and_reset_anchor_state(int token_type)
511 assert(0 <= token_type && token_type < T_LAST_TOKEN);
512 int count = token_anchor_set[token_type];
513 token_anchor_set[token_type] = 0;
517 static void restore_anchor_state(int token_type, int count)
519 assert(0 <= token_type && token_type < T_LAST_TOKEN);
520 token_anchor_set[token_type] = count;
524 * Remove a token from the token anchor set (a multi-set).
526 static void rem_anchor_token(int token_type)
528 assert(0 <= token_type && token_type < T_LAST_TOKEN);
529 --token_anchor_set[token_type];
532 static bool at_anchor(void)
536 return token_anchor_set[token.type];
540 * Eat tokens until a matching token is found.
542 static void eat_until_matching_token(int type)
546 case '(': end_token = ')'; break;
547 case '{': end_token = '}'; break;
548 case '[': end_token = ']'; break;
549 default: end_token = type; break;
552 unsigned parenthesis_count = 0;
553 unsigned brace_count = 0;
554 unsigned bracket_count = 0;
555 while (token.type != end_token ||
556 parenthesis_count != 0 ||
558 bracket_count != 0) {
559 switch (token.type) {
561 case '(': ++parenthesis_count; break;
562 case '{': ++brace_count; break;
563 case '[': ++bracket_count; break;
566 if (parenthesis_count > 0)
576 if (bracket_count > 0)
579 if (token.type == end_token &&
580 parenthesis_count == 0 &&
594 * Eat input tokens until an anchor is found.
596 static void eat_until_anchor(void)
598 if (token.type == T_EOF)
600 while (token_anchor_set[token.type] == 0) {
601 if (token.type == '(' || token.type == '{' || token.type == '[')
602 eat_until_matching_token(token.type);
603 if (token.type == T_EOF)
609 static void eat_block(void)
611 eat_until_matching_token('{');
612 if (token.type == '}')
617 * eat all token until a ';' is reached or a stop token is found.
619 static void eat_statement(void)
621 eat_until_matching_token(';');
622 if (token.type == ';')
626 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while (0)
629 * Report a parse error because an expected token was not found.
632 #if defined __GNUC__ && __GNUC__ >= 4
633 __attribute__((sentinel))
635 void parse_error_expected(const char *message, ...)
637 if (message != NULL) {
638 errorf(HERE, "%s", message);
641 va_start(ap, message);
642 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
647 * Report a type error.
649 static void type_error(const char *msg, const source_position_t *source_position,
652 errorf(source_position, "%s, but found type '%T'", msg, type);
656 * Report an incompatible type.
658 static void type_error_incompatible(const char *msg,
659 const source_position_t *source_position, type_t *type1, type_t *type2)
661 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
666 * Expect the the current token is the expected token.
667 * If not, generate an error, eat the current statement,
668 * and goto the end_error label.
670 #define expect(expected) \
672 if (UNLIKELY(token.type != (expected))) { \
673 parse_error_expected(NULL, (expected), NULL); \
674 add_anchor_token(expected); \
675 eat_until_anchor(); \
676 if (token.type == expected) \
678 rem_anchor_token(expected); \
684 static void set_scope(scope_t *new_scope)
687 scope->last_declaration = last_declaration;
691 last_declaration = new_scope->last_declaration;
695 * Search a symbol in a given namespace and returns its declaration or
696 * NULL if this symbol was not found.
698 static declaration_t *get_declaration(const symbol_t *const symbol,
699 const namespace_t namespc)
701 declaration_t *declaration = symbol->declaration;
702 for( ; declaration != NULL; declaration = declaration->symbol_next) {
703 if (declaration->namespc == namespc)
711 * pushs an environment_entry on the environment stack and links the
712 * corresponding symbol to the new entry
714 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
716 symbol_t *symbol = declaration->symbol;
717 namespace_t namespc = (namespace_t) declaration->namespc;
719 /* replace/add declaration into declaration list of the symbol */
720 declaration_t *iter = symbol->declaration;
722 symbol->declaration = declaration;
724 declaration_t *iter_last = NULL;
725 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
726 /* replace an entry? */
727 if (iter->namespc == namespc) {
728 if (iter_last == NULL) {
729 symbol->declaration = declaration;
731 iter_last->symbol_next = declaration;
733 declaration->symbol_next = iter->symbol_next;
738 assert(iter_last->symbol_next == NULL);
739 iter_last->symbol_next = declaration;
743 /* remember old declaration */
745 entry.symbol = symbol;
746 entry.old_declaration = iter;
747 entry.namespc = (unsigned short) namespc;
748 ARR_APP1(stack_entry_t, *stack_ptr, entry);
751 static void environment_push(declaration_t *declaration)
753 assert(declaration->source_position.input_name != NULL);
754 assert(declaration->parent_scope != NULL);
755 stack_push(&environment_stack, declaration);
759 * Push a declaration of the label stack.
761 * @param declaration the declaration
763 static void label_push(declaration_t *declaration)
765 declaration->parent_scope = ¤t_function->scope;
766 stack_push(&label_stack, declaration);
770 * pops symbols from the environment stack until @p new_top is the top element
772 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
774 stack_entry_t *stack = *stack_ptr;
775 size_t top = ARR_LEN(stack);
778 assert(new_top <= top);
782 for(i = top; i > new_top; --i) {
783 stack_entry_t *entry = &stack[i - 1];
785 declaration_t *old_declaration = entry->old_declaration;
786 symbol_t *symbol = entry->symbol;
787 namespace_t namespc = (namespace_t)entry->namespc;
789 /* replace/remove declaration */
790 declaration_t *declaration = symbol->declaration;
791 assert(declaration != NULL);
792 if (declaration->namespc == namespc) {
793 if (old_declaration == NULL) {
794 symbol->declaration = declaration->symbol_next;
796 symbol->declaration = old_declaration;
799 declaration_t *iter_last = declaration;
800 declaration_t *iter = declaration->symbol_next;
801 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
802 /* replace an entry? */
803 if (iter->namespc == namespc) {
804 assert(iter_last != NULL);
805 iter_last->symbol_next = old_declaration;
806 if (old_declaration != NULL) {
807 old_declaration->symbol_next = iter->symbol_next;
812 assert(iter != NULL);
816 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
819 static void environment_pop_to(size_t new_top)
821 stack_pop_to(&environment_stack, new_top);
825 * Pop all entries on the label stack until the new_top
828 * @param new_top the new stack top
830 static void label_pop_to(size_t new_top)
832 stack_pop_to(&label_stack, new_top);
836 static int get_rank(const type_t *type)
838 assert(!is_typeref(type));
839 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
840 * and esp. footnote 108). However we can't fold constants (yet), so we
841 * can't decide whether unsigned int is possible, while int always works.
842 * (unsigned int would be preferable when possible... for stuff like
843 * struct { enum { ... } bla : 4; } ) */
844 if (type->kind == TYPE_ENUM)
845 return ATOMIC_TYPE_INT;
847 assert(type->kind == TYPE_ATOMIC);
848 return type->atomic.akind;
851 static type_t *promote_integer(type_t *type)
853 if (type->kind == TYPE_BITFIELD)
854 type = type->bitfield.base_type;
856 if (get_rank(type) < ATOMIC_TYPE_INT)
863 * Create a cast expression.
865 * @param expression the expression to cast
866 * @param dest_type the destination type
868 static expression_t *create_cast_expression(expression_t *expression,
871 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
873 cast->unary.value = expression;
874 cast->base.type = dest_type;
880 * Check if a given expression represents the 0 pointer constant.
882 static bool is_null_pointer_constant(const expression_t *expression)
884 /* skip void* cast */
885 if (expression->kind == EXPR_UNARY_CAST
886 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
887 expression = expression->unary.value;
890 /* TODO: not correct yet, should be any constant integer expression
891 * which evaluates to 0 */
892 if (expression->kind != EXPR_CONST)
895 type_t *const type = skip_typeref(expression->base.type);
896 if (!is_type_integer(type))
899 return expression->conste.v.int_value == 0;
903 * Create an implicit cast expression.
905 * @param expression the expression to cast
906 * @param dest_type the destination type
908 static expression_t *create_implicit_cast(expression_t *expression,
911 type_t *const source_type = expression->base.type;
913 if (source_type == dest_type)
916 return create_cast_expression(expression, dest_type);
919 typedef enum assign_error_t {
921 ASSIGN_ERROR_INCOMPATIBLE,
922 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
923 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
924 ASSIGN_WARNING_POINTER_FROM_INT,
925 ASSIGN_WARNING_INT_FROM_POINTER
928 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
929 const expression_t *const right,
931 const source_position_t *source_position)
933 type_t *const orig_type_right = right->base.type;
934 type_t *const type_left = skip_typeref(orig_type_left);
935 type_t *const type_right = skip_typeref(orig_type_right);
940 case ASSIGN_ERROR_INCOMPATIBLE:
941 errorf(source_position,
942 "destination type '%T' in %s is incompatible with type '%T'",
943 orig_type_left, context, orig_type_right);
946 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
947 type_t *points_to_left
948 = skip_typeref(type_left->pointer.points_to);
949 type_t *points_to_right
950 = skip_typeref(type_right->pointer.points_to);
952 /* the left type has all qualifiers from the right type */
953 unsigned missing_qualifiers
954 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
955 errorf(source_position,
956 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type",
957 orig_type_left, context, orig_type_right, missing_qualifiers);
961 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
962 warningf(source_position,
963 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
964 orig_type_left, context, right, orig_type_right);
967 case ASSIGN_WARNING_POINTER_FROM_INT:
968 warningf(source_position,
969 "%s makes integer '%T' from pointer '%T' without a cast",
970 context, orig_type_left, orig_type_right);
973 case ASSIGN_WARNING_INT_FROM_POINTER:
974 warningf(source_position,
975 "%s makes integer '%T' from pointer '%T' without a cast",
976 context, orig_type_left, orig_type_right);
980 panic("invalid error value");
984 /** Implements the rules from § 6.5.16.1 */
985 static assign_error_t semantic_assign(type_t *orig_type_left,
986 const expression_t *const right)
988 type_t *const orig_type_right = right->base.type;
989 type_t *const type_left = skip_typeref(orig_type_left);
990 type_t *const type_right = skip_typeref(orig_type_right);
992 if (is_type_pointer(type_left)) {
993 if (is_null_pointer_constant(right)) {
994 return ASSIGN_SUCCESS;
995 } else if (is_type_pointer(type_right)) {
996 type_t *points_to_left
997 = skip_typeref(type_left->pointer.points_to);
998 type_t *points_to_right
999 = skip_typeref(type_right->pointer.points_to);
1001 /* the left type has all qualifiers from the right type */
1002 unsigned missing_qualifiers
1003 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1004 if (missing_qualifiers != 0) {
1005 return ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1008 points_to_left = get_unqualified_type(points_to_left);
1009 points_to_right = get_unqualified_type(points_to_right);
1011 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
1012 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1013 return ASSIGN_SUCCESS;
1016 if (!types_compatible(points_to_left, points_to_right)) {
1017 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1020 return ASSIGN_SUCCESS;
1021 } else if (is_type_integer(type_right)) {
1022 return ASSIGN_WARNING_POINTER_FROM_INT;
1024 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1025 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1026 && is_type_pointer(type_right))) {
1027 return ASSIGN_SUCCESS;
1028 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1029 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1030 type_t *const unqual_type_left = get_unqualified_type(type_left);
1031 type_t *const unqual_type_right = get_unqualified_type(type_right);
1032 if (types_compatible(unqual_type_left, unqual_type_right)) {
1033 return ASSIGN_SUCCESS;
1035 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1036 return ASSIGN_WARNING_INT_FROM_POINTER;
1039 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1040 return ASSIGN_SUCCESS;
1042 return ASSIGN_ERROR_INCOMPATIBLE;
1045 static expression_t *parse_constant_expression(void)
1047 /* start parsing at precedence 7 (conditional expression) */
1048 expression_t *result = parse_sub_expression(7);
1050 if (!is_constant_expression(result)) {
1051 errorf(&result->base.source_position,
1052 "expression '%E' is not constant\n", result);
1058 static expression_t *parse_assignment_expression(void)
1060 /* start parsing at precedence 2 (assignment expression) */
1061 return parse_sub_expression(2);
1064 static type_t *make_global_typedef(const char *name, type_t *type)
1066 symbol_t *const symbol = symbol_table_insert(name);
1068 declaration_t *const declaration = allocate_declaration_zero();
1069 declaration->namespc = NAMESPACE_NORMAL;
1070 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
1071 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1072 declaration->type = type;
1073 declaration->symbol = symbol;
1074 declaration->source_position = builtin_source_position;
1076 record_declaration(declaration);
1078 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1079 typedef_type->typedeft.declaration = declaration;
1081 return typedef_type;
1084 static string_t parse_string_literals(void)
1086 assert(token.type == T_STRING_LITERAL);
1087 string_t result = token.v.string;
1091 while (token.type == T_STRING_LITERAL) {
1092 result = concat_strings(&result, &token.v.string);
1099 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1100 [GNU_AK_CONST] = "const",
1101 [GNU_AK_VOLATILE] = "volatile",
1102 [GNU_AK_CDECL] = "cdecl",
1103 [GNU_AK_STDCALL] = "stdcall",
1104 [GNU_AK_FASTCALL] = "fastcall",
1105 [GNU_AK_DEPRECATED] = "deprecated",
1106 [GNU_AK_NOINLINE] = "noinline",
1107 [GNU_AK_NORETURN] = "noreturn",
1108 [GNU_AK_NAKED] = "naked",
1109 [GNU_AK_PURE] = "pure",
1110 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1111 [GNU_AK_MALLOC] = "malloc",
1112 [GNU_AK_WEAK] = "weak",
1113 [GNU_AK_CONSTRUCTOR] = "constructor",
1114 [GNU_AK_DESTRUCTOR] = "destructor",
1115 [GNU_AK_NOTHROW] = "nothrow",
1116 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1117 [GNU_AK_COMMON] = "common",
1118 [GNU_AK_NOCOMMON] = "nocommon",
1119 [GNU_AK_PACKED] = "packed",
1120 [GNU_AK_SHARED] = "shared",
1121 [GNU_AK_NOTSHARED] = "notshared",
1122 [GNU_AK_USED] = "used",
1123 [GNU_AK_UNUSED] = "unused",
1124 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1125 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1126 [GNU_AK_LONGCALL] = "longcall",
1127 [GNU_AK_SHORTCALL] = "shortcall",
1128 [GNU_AK_LONG_CALL] = "long_call",
1129 [GNU_AK_SHORT_CALL] = "short_call",
1130 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1131 [GNU_AK_INTERRUPT] = "interrupt",
1132 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1133 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1134 [GNU_AK_NESTING] = "nesting",
1135 [GNU_AK_NEAR] = "near",
1136 [GNU_AK_FAR] = "far",
1137 [GNU_AK_SIGNAL] = "signal",
1138 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1139 [GNU_AK_TINY_DATA] = "tiny_data",
1140 [GNU_AK_SAVEALL] = "saveall",
1141 [GNU_AK_FLATTEN] = "flatten",
1142 [GNU_AK_SSEREGPARM] = "sseregparm",
1143 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1144 [GNU_AK_RETURN_TWICE] = "return_twice",
1145 [GNU_AK_MAY_ALIAS] = "may_alias",
1146 [GNU_AK_MS_STRUCT] = "ms_struct",
1147 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1148 [GNU_AK_DLLIMPORT] = "dllimport",
1149 [GNU_AK_DLLEXPORT] = "dllexport",
1150 [GNU_AK_ALIGNED] = "aligned",
1151 [GNU_AK_ALIAS] = "alias",
1152 [GNU_AK_SECTION] = "section",
1153 [GNU_AK_FORMAT] = "format",
1154 [GNU_AK_FORMAT_ARG] = "format_arg",
1155 [GNU_AK_WEAKREF] = "weakref",
1156 [GNU_AK_NONNULL] = "nonnull",
1157 [GNU_AK_TLS_MODEL] = "tls_model",
1158 [GNU_AK_VISIBILITY] = "visibility",
1159 [GNU_AK_REGPARM] = "regparm",
1160 [GNU_AK_MODE] = "mode",
1161 [GNU_AK_MODEL] = "model",
1162 [GNU_AK_TRAP_EXIT] = "trap_exit",
1163 [GNU_AK_SP_SWITCH] = "sp_switch",
1164 [GNU_AK_SENTINEL] = "sentinel"
1168 * compare two string, ignoring double underscores on the second.
1170 static int strcmp_underscore(const char *s1, const char *s2)
1172 if (s2[0] == '_' && s2[1] == '_') {
1173 size_t len2 = strlen(s2);
1174 size_t len1 = strlen(s1);
1175 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1176 return strncmp(s1, s2+2, len2-4);
1180 return strcmp(s1, s2);
1184 * Allocate a new gnu temporal attribute.
1186 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1188 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1189 attribute->kind = kind;
1190 attribute->next = NULL;
1191 attribute->invalid = false;
1192 attribute->have_arguments = false;
1198 * parse one constant expression argument.
1200 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1202 expression_t *expression;
1203 add_anchor_token(')');
1204 expression = parse_constant_expression();
1205 rem_anchor_token(')');
1207 attribute->u.argument = fold_constant(expression);
1210 attribute->invalid = true;
1214 * parse a list of constant expressions arguments.
1216 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1218 argument_list_t **list = &attribute->u.arguments;
1219 argument_list_t *entry;
1220 expression_t *expression;
1221 add_anchor_token(')');
1222 add_anchor_token(',');
1224 expression = parse_constant_expression();
1225 entry = obstack_alloc(&temp_obst, sizeof(entry));
1226 entry->argument = fold_constant(expression);
1229 list = &entry->next;
1230 if (token.type != ',')
1234 rem_anchor_token(',');
1235 rem_anchor_token(')');
1239 attribute->invalid = true;
1243 * parse one string literal argument.
1245 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1248 add_anchor_token('(');
1249 if (token.type != T_STRING_LITERAL) {
1250 parse_error_expected("while parsing attribute directive",
1251 T_STRING_LITERAL, NULL);
1254 *string = parse_string_literals();
1255 rem_anchor_token('(');
1259 attribute->invalid = true;
1263 * parse one tls model.
1265 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1267 static const char *const tls_models[] = {
1273 string_t string = { NULL, 0 };
1274 parse_gnu_attribute_string_arg(attribute, &string);
1275 if (string.begin != NULL) {
1276 for(size_t i = 0; i < 4; ++i) {
1277 if (strcmp(tls_models[i], string.begin) == 0) {
1278 attribute->u.value = i;
1282 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1284 attribute->invalid = true;
1288 * parse one tls model.
1290 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1292 static const char *const visibilities[] = {
1298 string_t string = { NULL, 0 };
1299 parse_gnu_attribute_string_arg(attribute, &string);
1300 if (string.begin != NULL) {
1301 for(size_t i = 0; i < 4; ++i) {
1302 if (strcmp(visibilities[i], string.begin) == 0) {
1303 attribute->u.value = i;
1307 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1309 attribute->invalid = true;
1313 * parse one (code) model.
1315 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1317 static const char *const visibilities[] = {
1322 string_t string = { NULL, 0 };
1323 parse_gnu_attribute_string_arg(attribute, &string);
1324 if (string.begin != NULL) {
1325 for(int i = 0; i < 3; ++i) {
1326 if (strcmp(visibilities[i], string.begin) == 0) {
1327 attribute->u.value = i;
1331 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1333 attribute->invalid = true;
1336 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1338 /* TODO: find out what is allowed here... */
1340 /* at least: byte, word, pointer, list of machine modes
1341 * __XXX___ is interpreted as XXX */
1342 add_anchor_token(')');
1344 if (token.type != T_IDENTIFIER) {
1345 expect(T_IDENTIFIER);
1348 /* This isn't really correct, the backend should provide a list of machine
1349 * specific modes (according to gcc philosophy that is...) */
1350 const char *symbol_str = token.v.symbol->string;
1351 if (strcmp_underscore("QI", symbol_str) == 0 ||
1352 strcmp_underscore("byte", symbol_str) == 0) {
1353 attribute->u.akind = ATOMIC_TYPE_CHAR;
1354 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1355 attribute->u.akind = ATOMIC_TYPE_SHORT;
1356 } else if (strcmp_underscore("SI", symbol_str) == 0
1357 || strcmp_underscore("word", symbol_str) == 0
1358 || strcmp_underscore("pointer", symbol_str) == 0) {
1359 attribute->u.akind = ATOMIC_TYPE_INT;
1360 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1361 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1363 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1364 attribute->invalid = true;
1368 rem_anchor_token(')');
1372 attribute->invalid = true;
1376 * parse one interrupt argument.
1378 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1380 static const char *const interrupts[] = {
1387 string_t string = { NULL, 0 };
1388 parse_gnu_attribute_string_arg(attribute, &string);
1389 if (string.begin != NULL) {
1390 for(size_t i = 0; i < 5; ++i) {
1391 if (strcmp(interrupts[i], string.begin) == 0) {
1392 attribute->u.value = i;
1396 errorf(HERE, "'%s' is not an interrupt", string.begin);
1398 attribute->invalid = true;
1402 * parse ( identifier, const expression, const expression )
1404 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1406 static const char *const format_names[] = {
1414 if (token.type != T_IDENTIFIER) {
1415 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1418 const char *name = token.v.symbol->string;
1419 for(i = 0; i < 4; ++i) {
1420 if (strcmp_underscore(format_names[i], name) == 0)
1424 if (warning.attribute)
1425 warningf(HERE, "'%s' is an unrecognized format function type", name);
1430 add_anchor_token(')');
1431 add_anchor_token(',');
1432 parse_constant_expression();
1433 rem_anchor_token(',');
1434 rem_anchor_token('(');
1437 add_anchor_token(')');
1438 parse_constant_expression();
1439 rem_anchor_token('(');
1443 attribute->u.value = true;
1446 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1448 if (!attribute->have_arguments)
1451 /* should have no arguments */
1452 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1453 eat_until_matching_token('(');
1454 /* we have already consumed '(', so we stop before ')', eat it */
1456 attribute->invalid = true;
1460 * Parse one GNU attribute.
1462 * Note that attribute names can be specified WITH or WITHOUT
1463 * double underscores, ie const or __const__.
1465 * The following attributes are parsed without arguments
1490 * no_instrument_function
1491 * warn_unused_result
1508 * externally_visible
1516 * The following attributes are parsed with arguments
1517 * aligned( const expression )
1518 * alias( string literal )
1519 * section( string literal )
1520 * format( identifier, const expression, const expression )
1521 * format_arg( const expression )
1522 * tls_model( string literal )
1523 * visibility( string literal )
1524 * regparm( const expression )
1525 * model( string leteral )
1526 * trap_exit( const expression )
1527 * sp_switch( string literal )
1529 * The following attributes might have arguments
1530 * weak_ref( string literal )
1531 * non_null( const expression // ',' )
1532 * interrupt( string literal )
1533 * sentinel( constant expression )
1535 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1537 gnu_attribute_t *head = *attributes;
1538 gnu_attribute_t *last = *attributes;
1539 decl_modifiers_t modifiers = 0;
1540 gnu_attribute_t *attribute;
1542 eat(T___attribute__);
1546 if (token.type != ')') {
1547 /* find the end of the list */
1549 while (last->next != NULL)
1553 /* non-empty attribute list */
1556 if (token.type == T_const) {
1558 } else if (token.type == T_volatile) {
1560 } else if (token.type == T_cdecl) {
1561 /* __attribute__((cdecl)), WITH ms mode */
1563 } else if (token.type == T_IDENTIFIER) {
1564 const symbol_t *sym = token.v.symbol;
1567 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1574 for(i = 0; i < GNU_AK_LAST; ++i) {
1575 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1578 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1581 if (kind == GNU_AK_LAST) {
1582 if (warning.attribute)
1583 warningf(HERE, "'%s' attribute directive ignored", name);
1585 /* skip possible arguments */
1586 if (token.type == '(') {
1587 eat_until_matching_token(')');
1590 /* check for arguments */
1591 attribute = allocate_gnu_attribute(kind);
1592 if (token.type == '(') {
1594 if (token.type == ')') {
1595 /* empty args are allowed */
1598 attribute->have_arguments = true;
1603 case GNU_AK_VOLATILE:
1604 case GNU_AK_DEPRECATED:
1609 case GNU_AK_NOCOMMON:
1611 case GNU_AK_NOTSHARED:
1612 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1613 case GNU_AK_WARN_UNUSED_RESULT:
1614 case GNU_AK_LONGCALL:
1615 case GNU_AK_SHORTCALL:
1616 case GNU_AK_LONG_CALL:
1617 case GNU_AK_SHORT_CALL:
1618 case GNU_AK_FUNCTION_VECTOR:
1619 case GNU_AK_INTERRUPT_HANDLER:
1620 case GNU_AK_NMI_HANDLER:
1621 case GNU_AK_NESTING:
1625 case GNU_AK_EIGTHBIT_DATA:
1626 case GNU_AK_TINY_DATA:
1627 case GNU_AK_SAVEALL:
1628 case GNU_AK_FLATTEN:
1629 case GNU_AK_SSEREGPARM:
1630 case GNU_AK_EXTERNALLY_VISIBLE:
1631 case GNU_AK_RETURN_TWICE:
1632 case GNU_AK_MAY_ALIAS:
1633 case GNU_AK_MS_STRUCT:
1634 case GNU_AK_GCC_STRUCT:
1637 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1638 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1639 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1640 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1641 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1642 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1643 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1644 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1645 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1646 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1647 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1648 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1649 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1650 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1651 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1652 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1654 case GNU_AK_ALIGNED:
1655 /* __align__ may be used without an argument */
1656 if (attribute->have_arguments) {
1657 parse_gnu_attribute_const_arg(attribute);
1661 case GNU_AK_FORMAT_ARG:
1662 case GNU_AK_REGPARM:
1663 case GNU_AK_TRAP_EXIT:
1664 if (!attribute->have_arguments) {
1665 /* should have arguments */
1666 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1667 attribute->invalid = true;
1669 parse_gnu_attribute_const_arg(attribute);
1672 case GNU_AK_SECTION:
1673 case GNU_AK_SP_SWITCH:
1674 if (!attribute->have_arguments) {
1675 /* should have arguments */
1676 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1677 attribute->invalid = true;
1679 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1682 if (!attribute->have_arguments) {
1683 /* should have arguments */
1684 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1685 attribute->invalid = true;
1687 parse_gnu_attribute_format_args(attribute);
1689 case GNU_AK_WEAKREF:
1690 /* may have one string argument */
1691 if (attribute->have_arguments)
1692 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1694 case GNU_AK_NONNULL:
1695 if (attribute->have_arguments)
1696 parse_gnu_attribute_const_arg_list(attribute);
1698 case GNU_AK_TLS_MODEL:
1699 if (!attribute->have_arguments) {
1700 /* should have arguments */
1701 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1703 parse_gnu_attribute_tls_model_arg(attribute);
1705 case GNU_AK_VISIBILITY:
1706 if (!attribute->have_arguments) {
1707 /* should have arguments */
1708 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1710 parse_gnu_attribute_visibility_arg(attribute);
1713 if (!attribute->have_arguments) {
1714 /* should have arguments */
1715 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1717 parse_gnu_attribute_model_arg(attribute);
1721 if (!attribute->have_arguments) {
1722 /* should have arguments */
1723 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1725 parse_gnu_attribute_mode_arg(attribute);
1728 case GNU_AK_INTERRUPT:
1729 /* may have one string argument */
1730 if (attribute->have_arguments)
1731 parse_gnu_attribute_interrupt_arg(attribute);
1733 case GNU_AK_SENTINEL:
1734 /* may have one string argument */
1735 if (attribute->have_arguments)
1736 parse_gnu_attribute_const_arg(attribute);
1739 /* already handled */
1743 check_no_argument(attribute, name);
1746 if (attribute != NULL) {
1748 last->next = attribute;
1751 head = last = attribute;
1755 if (token.type != ',')
1769 * Parse GNU attributes.
1771 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1773 decl_modifiers_t modifiers = 0;
1776 switch(token.type) {
1777 case T___attribute__:
1778 modifiers |= parse_gnu_attribute(attributes);
1784 if (token.type != T_STRING_LITERAL) {
1785 parse_error_expected("while parsing assembler attribute",
1786 T_STRING_LITERAL, NULL);
1787 eat_until_matching_token('(');
1790 parse_string_literals();
1795 case T_cdecl: modifiers |= DM_CDECL; break;
1796 case T__fastcall: modifiers |= DM_FASTCALL; break;
1797 case T__stdcall: modifiers |= DM_STDCALL; break;
1800 /* TODO record modifier */
1801 warningf(HERE, "Ignoring declaration modifier %K", &token);
1805 default: return modifiers;
1812 static designator_t *parse_designation(void)
1814 designator_t *result = NULL;
1815 designator_t *last = NULL;
1818 designator_t *designator;
1819 switch(token.type) {
1821 designator = allocate_ast_zero(sizeof(designator[0]));
1822 designator->source_position = token.source_position;
1824 add_anchor_token(']');
1825 designator->array_index = parse_constant_expression();
1826 rem_anchor_token(']');
1830 designator = allocate_ast_zero(sizeof(designator[0]));
1831 designator->source_position = token.source_position;
1833 if (token.type != T_IDENTIFIER) {
1834 parse_error_expected("while parsing designator",
1835 T_IDENTIFIER, NULL);
1838 designator->symbol = token.v.symbol;
1846 assert(designator != NULL);
1848 last->next = designator;
1850 result = designator;
1858 static initializer_t *initializer_from_string(array_type_t *type,
1859 const string_t *const string)
1861 /* TODO: check len vs. size of array type */
1864 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1865 initializer->string.string = *string;
1870 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1871 wide_string_t *const string)
1873 /* TODO: check len vs. size of array type */
1876 initializer_t *const initializer =
1877 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1878 initializer->wide_string.string = *string;
1884 * Build an initializer from a given expression.
1886 static initializer_t *initializer_from_expression(type_t *orig_type,
1887 expression_t *expression)
1889 /* TODO check that expression is a constant expression */
1891 /* § 6.7.8.14/15 char array may be initialized by string literals */
1892 type_t *type = skip_typeref(orig_type);
1893 type_t *expr_type_orig = expression->base.type;
1894 type_t *expr_type = skip_typeref(expr_type_orig);
1895 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1896 array_type_t *const array_type = &type->array;
1897 type_t *const element_type = skip_typeref(array_type->element_type);
1899 if (element_type->kind == TYPE_ATOMIC) {
1900 atomic_type_kind_t akind = element_type->atomic.akind;
1901 switch (expression->kind) {
1902 case EXPR_STRING_LITERAL:
1903 if (akind == ATOMIC_TYPE_CHAR
1904 || akind == ATOMIC_TYPE_SCHAR
1905 || akind == ATOMIC_TYPE_UCHAR) {
1906 return initializer_from_string(array_type,
1907 &expression->string.value);
1910 case EXPR_WIDE_STRING_LITERAL: {
1911 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1912 if (get_unqualified_type(element_type) == bare_wchar_type) {
1913 return initializer_from_wide_string(array_type,
1914 &expression->wide_string.value);
1924 assign_error_t error = semantic_assign(type, expression);
1925 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1927 report_assign_error(error, type, expression, "initializer",
1928 &expression->base.source_position);
1930 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1931 result->value.value = create_implicit_cast(expression, type);
1937 * Checks if a given expression can be used as an constant initializer.
1939 static bool is_initializer_constant(const expression_t *expression)
1941 return is_constant_expression(expression)
1942 || is_address_constant(expression);
1946 * Parses an scalar initializer.
1948 * § 6.7.8.11; eat {} without warning
1950 static initializer_t *parse_scalar_initializer(type_t *type,
1951 bool must_be_constant)
1953 /* there might be extra {} hierarchies */
1955 if (token.type == '{') {
1956 warningf(HERE, "extra curly braces around scalar initializer");
1960 } while (token.type == '{');
1963 expression_t *expression = parse_assignment_expression();
1964 if (must_be_constant && !is_initializer_constant(expression)) {
1965 errorf(&expression->base.source_position,
1966 "Initialisation expression '%E' is not constant\n",
1970 initializer_t *initializer = initializer_from_expression(type, expression);
1972 if (initializer == NULL) {
1973 errorf(&expression->base.source_position,
1974 "expression '%E' (type '%T') doesn't match expected type '%T'",
1975 expression, expression->base.type, type);
1980 bool additional_warning_displayed = false;
1981 while (braces > 0) {
1982 if (token.type == ',') {
1985 if (token.type != '}') {
1986 if (!additional_warning_displayed) {
1987 warningf(HERE, "additional elements in scalar initializer");
1988 additional_warning_displayed = true;
1999 * An entry in the type path.
2001 typedef struct type_path_entry_t type_path_entry_t;
2002 struct type_path_entry_t {
2003 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2005 size_t index; /**< For array types: the current index. */
2006 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2011 * A type path expression a position inside compound or array types.
2013 typedef struct type_path_t type_path_t;
2014 struct type_path_t {
2015 type_path_entry_t *path; /**< An flexible array containing the current path. */
2016 type_t *top_type; /**< type of the element the path points */
2017 size_t max_index; /**< largest index in outermost array */
2021 * Prints a type path for debugging.
2023 static __attribute__((unused)) void debug_print_type_path(
2024 const type_path_t *path)
2026 size_t len = ARR_LEN(path->path);
2028 for(size_t i = 0; i < len; ++i) {
2029 const type_path_entry_t *entry = & path->path[i];
2031 type_t *type = skip_typeref(entry->type);
2032 if (is_type_compound(type)) {
2033 /* in gcc mode structs can have no members */
2034 if (entry->v.compound_entry == NULL) {
2038 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2039 } else if (is_type_array(type)) {
2040 fprintf(stderr, "[%zu]", entry->v.index);
2042 fprintf(stderr, "-INVALID-");
2045 if (path->top_type != NULL) {
2046 fprintf(stderr, " (");
2047 print_type(path->top_type);
2048 fprintf(stderr, ")");
2053 * Return the top type path entry, ie. in a path
2054 * (type).a.b returns the b.
2056 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2058 size_t len = ARR_LEN(path->path);
2060 return &path->path[len-1];
2064 * Enlarge the type path by an (empty) element.
2066 static type_path_entry_t *append_to_type_path(type_path_t *path)
2068 size_t len = ARR_LEN(path->path);
2069 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2071 type_path_entry_t *result = & path->path[len];
2072 memset(result, 0, sizeof(result[0]));
2077 * Descending into a sub-type. Enter the scope of the current
2080 static void descend_into_subtype(type_path_t *path)
2082 type_t *orig_top_type = path->top_type;
2083 type_t *top_type = skip_typeref(orig_top_type);
2085 assert(is_type_compound(top_type) || is_type_array(top_type));
2087 type_path_entry_t *top = append_to_type_path(path);
2088 top->type = top_type;
2090 if (is_type_compound(top_type)) {
2091 declaration_t *declaration = top_type->compound.declaration;
2092 declaration_t *entry = declaration->scope.declarations;
2093 top->v.compound_entry = entry;
2095 if (entry != NULL) {
2096 path->top_type = entry->type;
2098 path->top_type = NULL;
2101 assert(is_type_array(top_type));
2104 path->top_type = top_type->array.element_type;
2109 * Pop an entry from the given type path, ie. returning from
2110 * (type).a.b to (type).a
2112 static void ascend_from_subtype(type_path_t *path)
2114 type_path_entry_t *top = get_type_path_top(path);
2116 path->top_type = top->type;
2118 size_t len = ARR_LEN(path->path);
2119 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2123 * Pop entries from the given type path until the given
2124 * path level is reached.
2126 static void ascend_to(type_path_t *path, size_t top_path_level)
2128 size_t len = ARR_LEN(path->path);
2130 while (len > top_path_level) {
2131 ascend_from_subtype(path);
2132 len = ARR_LEN(path->path);
2136 static bool walk_designator(type_path_t *path, const designator_t *designator,
2137 bool used_in_offsetof)
2139 for( ; designator != NULL; designator = designator->next) {
2140 type_path_entry_t *top = get_type_path_top(path);
2141 type_t *orig_type = top->type;
2143 type_t *type = skip_typeref(orig_type);
2145 if (designator->symbol != NULL) {
2146 symbol_t *symbol = designator->symbol;
2147 if (!is_type_compound(type)) {
2148 if (is_type_valid(type)) {
2149 errorf(&designator->source_position,
2150 "'.%Y' designator used for non-compound type '%T'",
2156 declaration_t *declaration = type->compound.declaration;
2157 declaration_t *iter = declaration->scope.declarations;
2158 for( ; iter != NULL; iter = iter->next) {
2159 if (iter->symbol == symbol) {
2164 errorf(&designator->source_position,
2165 "'%T' has no member named '%Y'", orig_type, symbol);
2168 if (used_in_offsetof) {
2169 type_t *real_type = skip_typeref(iter->type);
2170 if (real_type->kind == TYPE_BITFIELD) {
2171 errorf(&designator->source_position,
2172 "offsetof designator '%Y' may not specify bitfield",
2178 top->type = orig_type;
2179 top->v.compound_entry = iter;
2180 orig_type = iter->type;
2182 expression_t *array_index = designator->array_index;
2183 assert(designator->array_index != NULL);
2185 if (!is_type_array(type)) {
2186 if (is_type_valid(type)) {
2187 errorf(&designator->source_position,
2188 "[%E] designator used for non-array type '%T'",
2189 array_index, orig_type);
2193 if (!is_type_valid(array_index->base.type)) {
2197 long index = fold_constant(array_index);
2198 if (!used_in_offsetof) {
2200 errorf(&designator->source_position,
2201 "array index [%E] must be positive", array_index);
2204 if (type->array.size_constant == true) {
2205 long array_size = type->array.size;
2206 if (index >= array_size) {
2207 errorf(&designator->source_position,
2208 "designator [%E] (%d) exceeds array size %d",
2209 array_index, index, array_size);
2215 top->type = orig_type;
2216 top->v.index = (size_t) index;
2217 orig_type = type->array.element_type;
2219 path->top_type = orig_type;
2221 if (designator->next != NULL) {
2222 descend_into_subtype(path);
2231 static void advance_current_object(type_path_t *path, size_t top_path_level)
2233 type_path_entry_t *top = get_type_path_top(path);
2235 type_t *type = skip_typeref(top->type);
2236 if (is_type_union(type)) {
2237 /* in unions only the first element is initialized */
2238 top->v.compound_entry = NULL;
2239 } else if (is_type_struct(type)) {
2240 declaration_t *entry = top->v.compound_entry;
2242 entry = entry->next;
2243 top->v.compound_entry = entry;
2244 if (entry != NULL) {
2245 path->top_type = entry->type;
2249 assert(is_type_array(type));
2253 if (!type->array.size_constant || top->v.index < type->array.size) {
2258 /* we're past the last member of the current sub-aggregate, try if we
2259 * can ascend in the type hierarchy and continue with another subobject */
2260 size_t len = ARR_LEN(path->path);
2262 if (len > top_path_level) {
2263 ascend_from_subtype(path);
2264 advance_current_object(path, top_path_level);
2266 path->top_type = NULL;
2271 * skip until token is found.
2273 static void skip_until(int type)
2275 while (token.type != type) {
2276 if (token.type == T_EOF)
2283 * skip any {...} blocks until a closing bracket is reached.
2285 static void skip_initializers(void)
2287 if (token.type == '{')
2290 while (token.type != '}') {
2291 if (token.type == T_EOF)
2293 if (token.type == '{') {
2301 static initializer_t *create_empty_initializer(void)
2303 static initializer_t empty_initializer
2304 = { .list = { { INITIALIZER_LIST }, 0 } };
2305 return &empty_initializer;
2309 * Parse a part of an initialiser for a struct or union,
2311 static initializer_t *parse_sub_initializer(type_path_t *path,
2312 type_t *outer_type, size_t top_path_level,
2313 parse_initializer_env_t *env)
2315 if (token.type == '}') {
2316 /* empty initializer */
2317 return create_empty_initializer();
2320 type_t *orig_type = path->top_type;
2321 type_t *type = NULL;
2323 if (orig_type == NULL) {
2324 /* We are initializing an empty compound. */
2326 type = skip_typeref(orig_type);
2328 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2329 * initializers in this case. */
2330 if (!is_type_valid(type)) {
2331 skip_initializers();
2332 return create_empty_initializer();
2336 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2339 designator_t *designator = NULL;
2340 if (token.type == '.' || token.type == '[') {
2341 designator = parse_designation();
2343 /* reset path to toplevel, evaluate designator from there */
2344 ascend_to(path, top_path_level);
2345 if (!walk_designator(path, designator, false)) {
2346 /* can't continue after designation error */
2350 initializer_t *designator_initializer
2351 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2352 designator_initializer->designator.designator = designator;
2353 ARR_APP1(initializer_t*, initializers, designator_initializer);
2355 orig_type = path->top_type;
2356 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2361 if (token.type == '{') {
2362 if (type != NULL && is_type_scalar(type)) {
2363 sub = parse_scalar_initializer(type, env->must_be_constant);
2367 if (env->declaration != NULL) {
2368 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2369 env->declaration->symbol);
2371 errorf(HERE, "extra brace group at end of initializer");
2374 descend_into_subtype(path);
2376 add_anchor_token('}');
2377 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2379 rem_anchor_token('}');
2382 ascend_from_subtype(path);
2386 goto error_parse_next;
2390 /* must be an expression */
2391 expression_t *expression = parse_assignment_expression();
2393 if (env->must_be_constant && !is_initializer_constant(expression)) {
2394 errorf(&expression->base.source_position,
2395 "Initialisation expression '%E' is not constant\n",
2400 /* we are already outside, ... */
2404 /* handle { "string" } special case */
2405 if ((expression->kind == EXPR_STRING_LITERAL
2406 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2407 && outer_type != NULL) {
2408 sub = initializer_from_expression(outer_type, expression);
2410 if (token.type == ',') {
2413 if (token.type != '}') {
2414 warningf(HERE, "excessive elements in initializer for type '%T'",
2417 /* TODO: eat , ... */
2422 /* descend into subtypes until expression matches type */
2424 orig_type = path->top_type;
2425 type = skip_typeref(orig_type);
2427 sub = initializer_from_expression(orig_type, expression);
2431 if (!is_type_valid(type)) {
2434 if (is_type_scalar(type)) {
2435 errorf(&expression->base.source_position,
2436 "expression '%E' doesn't match expected type '%T'",
2437 expression, orig_type);
2441 descend_into_subtype(path);
2445 /* update largest index of top array */
2446 const type_path_entry_t *first = &path->path[0];
2447 type_t *first_type = first->type;
2448 first_type = skip_typeref(first_type);
2449 if (is_type_array(first_type)) {
2450 size_t index = first->v.index;
2451 if (index > path->max_index)
2452 path->max_index = index;
2456 /* append to initializers list */
2457 ARR_APP1(initializer_t*, initializers, sub);
2460 if (env->declaration != NULL)
2461 warningf(HERE, "excess elements in struct initializer for '%Y'",
2462 env->declaration->symbol);
2464 warningf(HERE, "excess elements in struct initializer");
2468 if (token.type == '}') {
2472 if (token.type == '}') {
2477 /* advance to the next declaration if we are not at the end */
2478 advance_current_object(path, top_path_level);
2479 orig_type = path->top_type;
2480 if (orig_type != NULL)
2481 type = skip_typeref(orig_type);
2487 size_t len = ARR_LEN(initializers);
2488 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2489 initializer_t *result = allocate_ast_zero(size);
2490 result->kind = INITIALIZER_LIST;
2491 result->list.len = len;
2492 memcpy(&result->list.initializers, initializers,
2493 len * sizeof(initializers[0]));
2495 DEL_ARR_F(initializers);
2496 ascend_to(path, top_path_level+1);
2501 skip_initializers();
2502 DEL_ARR_F(initializers);
2503 ascend_to(path, top_path_level+1);
2508 * Parses an initializer. Parsers either a compound literal
2509 * (env->declaration == NULL) or an initializer of a declaration.
2511 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2513 type_t *type = skip_typeref(env->type);
2514 initializer_t *result = NULL;
2517 if (is_type_scalar(type)) {
2518 result = parse_scalar_initializer(type, env->must_be_constant);
2519 } else if (token.type == '{') {
2523 memset(&path, 0, sizeof(path));
2524 path.top_type = env->type;
2525 path.path = NEW_ARR_F(type_path_entry_t, 0);
2527 descend_into_subtype(&path);
2529 add_anchor_token('}');
2530 result = parse_sub_initializer(&path, env->type, 1, env);
2531 rem_anchor_token('}');
2533 max_index = path.max_index;
2534 DEL_ARR_F(path.path);
2538 /* parse_scalar_initializer() also works in this case: we simply
2539 * have an expression without {} around it */
2540 result = parse_scalar_initializer(type, env->must_be_constant);
2543 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2544 * the array type size */
2545 if (is_type_array(type) && type->array.size_expression == NULL
2546 && result != NULL) {
2548 switch (result->kind) {
2549 case INITIALIZER_LIST:
2550 size = max_index + 1;
2553 case INITIALIZER_STRING:
2554 size = result->string.string.size;
2557 case INITIALIZER_WIDE_STRING:
2558 size = result->wide_string.string.size;
2561 case INITIALIZER_DESIGNATOR:
2562 case INITIALIZER_VALUE:
2563 /* can happen for parse errors */
2568 internal_errorf(HERE, "invalid initializer type");
2571 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2572 cnst->base.type = type_size_t;
2573 cnst->conste.v.int_value = size;
2575 type_t *new_type = duplicate_type(type);
2577 new_type->array.size_expression = cnst;
2578 new_type->array.size_constant = true;
2579 new_type->array.size = size;
2580 env->type = new_type;
2588 static declaration_t *append_declaration(declaration_t *declaration);
2590 static declaration_t *parse_compound_type_specifier(bool is_struct)
2592 gnu_attribute_t *attributes = NULL;
2593 decl_modifiers_t modifiers = 0;
2600 symbol_t *symbol = NULL;
2601 declaration_t *declaration = NULL;
2603 if (token.type == T___attribute__) {
2604 modifiers |= parse_attributes(&attributes);
2607 if (token.type == T_IDENTIFIER) {
2608 symbol = token.v.symbol;
2611 namespace_t const namespc =
2612 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2613 declaration = get_declaration(symbol, namespc);
2614 if (declaration != NULL) {
2615 if (declaration->parent_scope != scope &&
2616 (token.type == '{' || token.type == ';')) {
2618 } else if (declaration->init.complete &&
2619 token.type == '{') {
2620 assert(symbol != NULL);
2621 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2622 is_struct ? "struct" : "union", symbol,
2623 &declaration->source_position);
2624 declaration->scope.declarations = NULL;
2627 } else if (token.type != '{') {
2629 parse_error_expected("while parsing struct type specifier",
2630 T_IDENTIFIER, '{', NULL);
2632 parse_error_expected("while parsing union type specifier",
2633 T_IDENTIFIER, '{', NULL);
2639 if (declaration == NULL) {
2640 declaration = allocate_declaration_zero();
2641 declaration->namespc =
2642 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2643 declaration->source_position = token.source_position;
2644 declaration->symbol = symbol;
2645 declaration->parent_scope = scope;
2646 if (symbol != NULL) {
2647 environment_push(declaration);
2649 append_declaration(declaration);
2652 if (token.type == '{') {
2653 declaration->init.complete = true;
2655 parse_compound_type_entries(declaration);
2656 modifiers |= parse_attributes(&attributes);
2659 declaration->modifiers |= modifiers;
2663 static void parse_enum_entries(type_t *const enum_type)
2667 if (token.type == '}') {
2669 errorf(HERE, "empty enum not allowed");
2673 add_anchor_token('}');
2675 if (token.type != T_IDENTIFIER) {
2676 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2678 rem_anchor_token('}');
2682 declaration_t *const entry = allocate_declaration_zero();
2683 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2684 entry->type = enum_type;
2685 entry->symbol = token.v.symbol;
2686 entry->source_position = token.source_position;
2689 if (token.type == '=') {
2691 expression_t *value = parse_constant_expression();
2693 value = create_implicit_cast(value, enum_type);
2694 entry->init.enum_value = value;
2699 record_declaration(entry);
2701 if (token.type != ',')
2704 } while (token.type != '}');
2705 rem_anchor_token('}');
2713 static type_t *parse_enum_specifier(void)
2715 gnu_attribute_t *attributes = NULL;
2716 declaration_t *declaration;
2720 if (token.type == T_IDENTIFIER) {
2721 symbol = token.v.symbol;
2724 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2725 } else if (token.type != '{') {
2726 parse_error_expected("while parsing enum type specifier",
2727 T_IDENTIFIER, '{', NULL);
2734 if (declaration == NULL) {
2735 declaration = allocate_declaration_zero();
2736 declaration->namespc = NAMESPACE_ENUM;
2737 declaration->source_position = token.source_position;
2738 declaration->symbol = symbol;
2739 declaration->parent_scope = scope;
2742 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2743 type->enumt.declaration = declaration;
2745 if (token.type == '{') {
2746 if (declaration->init.complete) {
2747 errorf(HERE, "multiple definitions of enum %Y", symbol);
2749 if (symbol != NULL) {
2750 environment_push(declaration);
2752 append_declaration(declaration);
2753 declaration->init.complete = true;
2755 parse_enum_entries(type);
2756 parse_attributes(&attributes);
2763 * if a symbol is a typedef to another type, return true
2765 static bool is_typedef_symbol(symbol_t *symbol)
2767 const declaration_t *const declaration =
2768 get_declaration(symbol, NAMESPACE_NORMAL);
2770 declaration != NULL &&
2771 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2774 static type_t *parse_typeof(void)
2781 add_anchor_token(')');
2783 expression_t *expression = NULL;
2786 switch(token.type) {
2787 case T___extension__:
2788 /* This can be a prefix to a typename or an expression. We simply eat
2792 } while (token.type == T___extension__);
2796 if (is_typedef_symbol(token.v.symbol)) {
2797 type = parse_typename();
2799 expression = parse_expression();
2800 type = expression->base.type;
2805 type = parse_typename();
2809 expression = parse_expression();
2810 type = expression->base.type;
2814 rem_anchor_token(')');
2817 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2818 typeof_type->typeoft.expression = expression;
2819 typeof_type->typeoft.typeof_type = type;
2826 typedef enum specifiers_t {
2827 SPECIFIER_SIGNED = 1 << 0,
2828 SPECIFIER_UNSIGNED = 1 << 1,
2829 SPECIFIER_LONG = 1 << 2,
2830 SPECIFIER_INT = 1 << 3,
2831 SPECIFIER_DOUBLE = 1 << 4,
2832 SPECIFIER_CHAR = 1 << 5,
2833 SPECIFIER_SHORT = 1 << 6,
2834 SPECIFIER_LONG_LONG = 1 << 7,
2835 SPECIFIER_FLOAT = 1 << 8,
2836 SPECIFIER_BOOL = 1 << 9,
2837 SPECIFIER_VOID = 1 << 10,
2838 SPECIFIER_INT8 = 1 << 11,
2839 SPECIFIER_INT16 = 1 << 12,
2840 SPECIFIER_INT32 = 1 << 13,
2841 SPECIFIER_INT64 = 1 << 14,
2842 SPECIFIER_INT128 = 1 << 15,
2843 SPECIFIER_COMPLEX = 1 << 16,
2844 SPECIFIER_IMAGINARY = 1 << 17,
2847 static type_t *create_builtin_type(symbol_t *const symbol,
2848 type_t *const real_type)
2850 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2851 type->builtin.symbol = symbol;
2852 type->builtin.real_type = real_type;
2854 type_t *result = typehash_insert(type);
2855 if (type != result) {
2862 static type_t *get_typedef_type(symbol_t *symbol)
2864 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2865 if (declaration == NULL ||
2866 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2869 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2870 type->typedeft.declaration = declaration;
2876 * check for the allowed MS alignment values.
2878 static bool check_alignment_value(long long intvalue)
2880 if (intvalue < 1 || intvalue > 8192) {
2881 errorf(HERE, "illegal alignment value");
2884 unsigned v = (unsigned)intvalue;
2885 for(unsigned i = 1; i <= 8192; i += i) {
2889 errorf(HERE, "alignment must be power of two");
2893 #define DET_MOD(name, tag) do { \
2894 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2895 *modifiers |= tag; \
2898 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2900 decl_modifiers_t *modifiers = &specifiers->modifiers;
2903 if (token.type == T_restrict) {
2905 DET_MOD(restrict, DM_RESTRICT);
2907 } else if (token.type != T_IDENTIFIER)
2909 symbol_t *symbol = token.v.symbol;
2910 if (symbol == sym_align) {
2913 if (token.type != T_INTEGER)
2915 if (check_alignment_value(token.v.intvalue)) {
2916 if (specifiers->alignment != 0)
2917 warningf(HERE, "align used more than once");
2918 specifiers->alignment = (unsigned char)token.v.intvalue;
2922 } else if (symbol == sym_allocate) {
2925 if (token.type != T_IDENTIFIER)
2927 (void)token.v.symbol;
2929 } else if (symbol == sym_dllimport) {
2931 DET_MOD(dllimport, DM_DLLIMPORT);
2932 } else if (symbol == sym_dllexport) {
2934 DET_MOD(dllexport, DM_DLLEXPORT);
2935 } else if (symbol == sym_thread) {
2937 DET_MOD(thread, DM_THREAD);
2938 } else if (symbol == sym_naked) {
2940 DET_MOD(naked, DM_NAKED);
2941 } else if (symbol == sym_noinline) {
2943 DET_MOD(noinline, DM_NOINLINE);
2944 } else if (symbol == sym_noreturn) {
2946 DET_MOD(noreturn, DM_NORETURN);
2947 } else if (symbol == sym_nothrow) {
2949 DET_MOD(nothrow, DM_NOTHROW);
2950 } else if (symbol == sym_novtable) {
2952 DET_MOD(novtable, DM_NOVTABLE);
2953 } else if (symbol == sym_property) {
2957 bool is_get = false;
2958 if (token.type != T_IDENTIFIER)
2960 if (token.v.symbol == sym_get) {
2962 } else if (token.v.symbol == sym_put) {
2964 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2969 if (token.type != T_IDENTIFIER)
2972 if (specifiers->get_property_sym != NULL) {
2973 errorf(HERE, "get property name already specified");
2975 specifiers->get_property_sym = token.v.symbol;
2978 if (specifiers->put_property_sym != NULL) {
2979 errorf(HERE, "put property name already specified");
2981 specifiers->put_property_sym = token.v.symbol;
2985 if (token.type == ',') {
2992 } else if (symbol == sym_selectany) {
2994 DET_MOD(selectany, DM_SELECTANY);
2995 } else if (symbol == sym_uuid) {
2998 if (token.type != T_STRING_LITERAL)
3002 } else if (symbol == sym_deprecated) {
3004 if (specifiers->deprecated != 0)
3005 warningf(HERE, "deprecated used more than once");
3006 specifiers->deprecated = 1;
3007 if (token.type == '(') {
3009 if (token.type == T_STRING_LITERAL) {
3010 specifiers->deprecated_string = token.v.string.begin;
3013 errorf(HERE, "string literal expected");
3017 } else if (symbol == sym_noalias) {
3019 DET_MOD(noalias, DM_NOALIAS);
3021 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3023 if (token.type == '(')
3027 if (token.type == ',')
3034 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3036 type_t *type = NULL;
3037 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3038 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3039 unsigned type_specifiers = 0;
3042 specifiers->source_position = token.source_position;
3045 specifiers->modifiers
3046 |= parse_attributes(&specifiers->gnu_attributes);
3047 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3048 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3050 switch(token.type) {
3053 #define MATCH_STORAGE_CLASS(token, class) \
3055 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3056 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3058 specifiers->declared_storage_class = class; \
3062 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3063 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3064 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3065 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3066 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3071 add_anchor_token(')');
3072 parse_microsoft_extended_decl_modifier(specifiers);
3073 rem_anchor_token(')');
3078 switch (specifiers->declared_storage_class) {
3079 case STORAGE_CLASS_NONE:
3080 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3083 case STORAGE_CLASS_EXTERN:
3084 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3087 case STORAGE_CLASS_STATIC:
3088 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3092 errorf(HERE, "multiple storage classes in declaration specifiers");
3098 /* type qualifiers */
3099 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3101 qualifiers |= qualifier; \
3105 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3106 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3107 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3108 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3109 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3110 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3111 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3112 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3114 case T___extension__:
3119 /* type specifiers */
3120 #define MATCH_SPECIFIER(token, specifier, name) \
3123 if (type_specifiers & specifier) { \
3124 errorf(HERE, "multiple " name " type specifiers given"); \
3126 type_specifiers |= specifier; \
3130 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3131 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3132 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3133 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3134 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3135 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3136 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3137 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3138 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3139 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3140 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3141 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3142 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3143 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3144 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3145 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3147 case T__forceinline:
3148 /* only in microsoft mode */
3149 specifiers->modifiers |= DM_FORCEINLINE;
3154 specifiers->is_inline = true;
3159 if (type_specifiers & SPECIFIER_LONG_LONG) {
3160 errorf(HERE, "multiple type specifiers given");
3161 } else if (type_specifiers & SPECIFIER_LONG) {
3162 type_specifiers |= SPECIFIER_LONG_LONG;
3164 type_specifiers |= SPECIFIER_LONG;
3169 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3171 type->compound.declaration = parse_compound_type_specifier(true);
3175 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3176 type->compound.declaration = parse_compound_type_specifier(false);
3177 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3178 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3182 type = parse_enum_specifier();
3185 type = parse_typeof();
3187 case T___builtin_va_list:
3188 type = duplicate_type(type_valist);
3192 case T_IDENTIFIER: {
3193 /* only parse identifier if we haven't found a type yet */
3194 if (type != NULL || type_specifiers != 0)
3195 goto finish_specifiers;
3197 type_t *typedef_type = get_typedef_type(token.v.symbol);
3199 if (typedef_type == NULL)
3200 goto finish_specifiers;
3203 type = typedef_type;
3207 /* function specifier */
3209 goto finish_specifiers;
3216 atomic_type_kind_t atomic_type;
3218 /* match valid basic types */
3219 switch(type_specifiers) {
3220 case SPECIFIER_VOID:
3221 atomic_type = ATOMIC_TYPE_VOID;
3223 case SPECIFIER_CHAR:
3224 atomic_type = ATOMIC_TYPE_CHAR;
3226 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3227 atomic_type = ATOMIC_TYPE_SCHAR;
3229 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3230 atomic_type = ATOMIC_TYPE_UCHAR;
3232 case SPECIFIER_SHORT:
3233 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3234 case SPECIFIER_SHORT | SPECIFIER_INT:
3235 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3236 atomic_type = ATOMIC_TYPE_SHORT;
3238 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3239 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3240 atomic_type = ATOMIC_TYPE_USHORT;
3243 case SPECIFIER_SIGNED:
3244 case SPECIFIER_SIGNED | SPECIFIER_INT:
3245 atomic_type = ATOMIC_TYPE_INT;
3247 case SPECIFIER_UNSIGNED:
3248 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3249 atomic_type = ATOMIC_TYPE_UINT;
3251 case SPECIFIER_LONG:
3252 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3253 case SPECIFIER_LONG | SPECIFIER_INT:
3254 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3255 atomic_type = ATOMIC_TYPE_LONG;
3257 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3258 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3259 atomic_type = ATOMIC_TYPE_ULONG;
3261 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3262 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3263 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3264 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3266 atomic_type = ATOMIC_TYPE_LONGLONG;
3268 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3269 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3271 atomic_type = ATOMIC_TYPE_ULONGLONG;
3274 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3275 atomic_type = unsigned_int8_type_kind;
3278 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3279 atomic_type = unsigned_int16_type_kind;
3282 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3283 atomic_type = unsigned_int32_type_kind;
3286 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3287 atomic_type = unsigned_int64_type_kind;
3290 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3291 atomic_type = unsigned_int128_type_kind;
3294 case SPECIFIER_INT8:
3295 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3296 atomic_type = int8_type_kind;
3299 case SPECIFIER_INT16:
3300 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3301 atomic_type = int16_type_kind;
3304 case SPECIFIER_INT32:
3305 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3306 atomic_type = int32_type_kind;
3309 case SPECIFIER_INT64:
3310 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3311 atomic_type = int64_type_kind;
3314 case SPECIFIER_INT128:
3315 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3316 atomic_type = int128_type_kind;
3319 case SPECIFIER_FLOAT:
3320 atomic_type = ATOMIC_TYPE_FLOAT;
3322 case SPECIFIER_DOUBLE:
3323 atomic_type = ATOMIC_TYPE_DOUBLE;
3325 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3326 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3328 case SPECIFIER_BOOL:
3329 atomic_type = ATOMIC_TYPE_BOOL;
3331 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3332 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3333 atomic_type = ATOMIC_TYPE_FLOAT;
3335 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3336 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3337 atomic_type = ATOMIC_TYPE_DOUBLE;
3339 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3340 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3341 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3344 /* invalid specifier combination, give an error message */
3345 if (type_specifiers == 0) {
3346 if (! strict_mode) {
3347 if (warning.implicit_int) {
3348 warningf(HERE, "no type specifiers in declaration, using 'int'");
3350 atomic_type = ATOMIC_TYPE_INT;
3353 errorf(HERE, "no type specifiers given in declaration");
3355 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3356 (type_specifiers & SPECIFIER_UNSIGNED)) {
3357 errorf(HERE, "signed and unsigned specifiers gives");
3358 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3359 errorf(HERE, "only integer types can be signed or unsigned");
3361 errorf(HERE, "multiple datatypes in declaration");
3363 atomic_type = ATOMIC_TYPE_INVALID;
3366 if (type_specifiers & SPECIFIER_COMPLEX &&
3367 atomic_type != ATOMIC_TYPE_INVALID) {
3368 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3369 type->complex.akind = atomic_type;
3370 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3371 atomic_type != ATOMIC_TYPE_INVALID) {
3372 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3373 type->imaginary.akind = atomic_type;
3375 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3376 type->atomic.akind = atomic_type;
3380 if (type_specifiers != 0) {
3381 errorf(HERE, "multiple datatypes in declaration");
3385 /* FIXME: check type qualifiers here */
3387 type->base.qualifiers = qualifiers;
3388 type->base.modifiers = modifiers;
3390 type_t *result = typehash_insert(type);
3391 if (newtype && result != type) {
3395 specifiers->type = result;
3400 static type_qualifiers_t parse_type_qualifiers(void)
3402 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3405 switch(token.type) {
3406 /* type qualifiers */
3407 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3408 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3409 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3410 /* microsoft extended type modifiers */
3411 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3412 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3413 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3414 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3415 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3423 static declaration_t *parse_identifier_list(void)
3425 declaration_t *declarations = NULL;
3426 declaration_t *last_declaration = NULL;
3428 declaration_t *const declaration = allocate_declaration_zero();
3429 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3430 declaration->source_position = token.source_position;
3431 declaration->symbol = token.v.symbol;
3434 if (last_declaration != NULL) {
3435 last_declaration->next = declaration;
3437 declarations = declaration;
3439 last_declaration = declaration;
3441 if (token.type != ',') {
3445 } while (token.type == T_IDENTIFIER);
3447 return declarations;
3450 static type_t *automatic_type_conversion(type_t *orig_type);
3452 static void semantic_parameter(declaration_t *declaration)
3454 /* TODO: improve error messages */
3456 if (declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3457 errorf(HERE, "typedef not allowed in parameter list");
3458 } else if (declaration->declared_storage_class != STORAGE_CLASS_NONE
3459 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3460 errorf(HERE, "parameter may only have none or register storage class");
3463 type_t *const orig_type = declaration->type;
3464 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3465 * sugar. Turn it into a pointer.
3466 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3467 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3469 type_t *const type = automatic_type_conversion(orig_type);
3470 declaration->type = type;
3472 if (is_type_incomplete(skip_typeref(type))) {
3473 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3474 orig_type, declaration->symbol);
3478 static declaration_t *parse_parameter(void)
3480 declaration_specifiers_t specifiers;
3481 memset(&specifiers, 0, sizeof(specifiers));
3483 parse_declaration_specifiers(&specifiers);
3485 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3490 static declaration_t *parse_parameters(function_type_t *type)
3492 declaration_t *declarations = NULL;
3495 add_anchor_token(')');
3496 int saved_comma_state = save_and_reset_anchor_state(',');
3498 if (token.type == T_IDENTIFIER) {
3499 symbol_t *symbol = token.v.symbol;
3500 if (!is_typedef_symbol(symbol)) {
3501 type->kr_style_parameters = true;
3502 declarations = parse_identifier_list();
3503 goto parameters_finished;
3507 if (token.type == ')') {
3508 type->unspecified_parameters = 1;
3509 goto parameters_finished;
3512 declaration_t *declaration;
3513 declaration_t *last_declaration = NULL;
3514 function_parameter_t *parameter;
3515 function_parameter_t *last_parameter = NULL;
3518 switch(token.type) {
3522 goto parameters_finished;
3525 case T___extension__:
3527 declaration = parse_parameter();
3529 /* func(void) is not a parameter */
3530 if (last_parameter == NULL
3531 && token.type == ')'
3532 && declaration->symbol == NULL
3533 && skip_typeref(declaration->type) == type_void) {
3534 goto parameters_finished;
3536 semantic_parameter(declaration);
3538 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3539 memset(parameter, 0, sizeof(parameter[0]));
3540 parameter->type = declaration->type;
3542 if (last_parameter != NULL) {
3543 last_declaration->next = declaration;
3544 last_parameter->next = parameter;
3546 type->parameters = parameter;
3547 declarations = declaration;
3549 last_parameter = parameter;
3550 last_declaration = declaration;
3554 goto parameters_finished;
3556 if (token.type != ',') {
3557 goto parameters_finished;
3563 parameters_finished:
3564 rem_anchor_token(')');
3567 restore_anchor_state(',', saved_comma_state);
3568 return declarations;
3571 restore_anchor_state(',', saved_comma_state);
3575 typedef enum construct_type_kind_t {
3580 } construct_type_kind_t;
3582 typedef struct construct_type_t construct_type_t;
3583 struct construct_type_t {
3584 construct_type_kind_t kind;
3585 construct_type_t *next;
3588 typedef struct parsed_pointer_t parsed_pointer_t;
3589 struct parsed_pointer_t {
3590 construct_type_t construct_type;
3591 type_qualifiers_t type_qualifiers;
3594 typedef struct construct_function_type_t construct_function_type_t;
3595 struct construct_function_type_t {
3596 construct_type_t construct_type;
3597 type_t *function_type;
3600 typedef struct parsed_array_t parsed_array_t;
3601 struct parsed_array_t {
3602 construct_type_t construct_type;
3603 type_qualifiers_t type_qualifiers;
3609 typedef struct construct_base_type_t construct_base_type_t;
3610 struct construct_base_type_t {
3611 construct_type_t construct_type;
3615 static construct_type_t *parse_pointer_declarator(void)
3619 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3620 memset(pointer, 0, sizeof(pointer[0]));
3621 pointer->construct_type.kind = CONSTRUCT_POINTER;
3622 pointer->type_qualifiers = parse_type_qualifiers();
3624 return (construct_type_t*) pointer;
3627 static construct_type_t *parse_array_declarator(void)
3630 add_anchor_token(']');
3632 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3633 memset(array, 0, sizeof(array[0]));
3634 array->construct_type.kind = CONSTRUCT_ARRAY;
3636 if (token.type == T_static) {
3637 array->is_static = true;
3641 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3642 if (type_qualifiers != 0) {
3643 if (token.type == T_static) {
3644 array->is_static = true;
3648 array->type_qualifiers = type_qualifiers;
3650 if (token.type == '*' && look_ahead(1)->type == ']') {
3651 array->is_variable = true;
3653 } else if (token.type != ']') {
3654 array->size = parse_assignment_expression();
3657 rem_anchor_token(']');
3660 return (construct_type_t*) array;
3665 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3668 if (declaration != NULL) {
3669 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3671 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3673 if (mask & (mask-1)) {
3674 const char *first = NULL, *second = NULL;
3676 /* more than one calling convention set */
3677 if (declaration->modifiers & DM_CDECL) {
3678 if (first == NULL) first = "cdecl";
3679 else if (second == NULL) second = "cdecl";
3681 if (declaration->modifiers & DM_STDCALL) {
3682 if (first == NULL) first = "stdcall";
3683 else if (second == NULL) second = "stdcall";
3685 if (declaration->modifiers & DM_FASTCALL) {
3686 if (first == NULL) first = "faslcall";
3687 else if (second == NULL) second = "fastcall";
3689 if (declaration->modifiers & DM_THISCALL) {
3690 if (first == NULL) first = "thiscall";
3691 else if (second == NULL) second = "thiscall";
3693 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3696 if (declaration->modifiers & DM_CDECL)
3697 type->function.calling_convention = CC_CDECL;
3698 else if (declaration->modifiers & DM_STDCALL)
3699 type->function.calling_convention = CC_STDCALL;
3700 else if (declaration->modifiers & DM_FASTCALL)
3701 type->function.calling_convention = CC_FASTCALL;
3702 else if (declaration->modifiers & DM_THISCALL)
3703 type->function.calling_convention = CC_THISCALL;
3705 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3708 declaration_t *parameters = parse_parameters(&type->function);
3709 if (declaration != NULL) {
3710 declaration->scope.declarations = parameters;
3713 construct_function_type_t *construct_function_type =
3714 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3715 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3716 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3717 construct_function_type->function_type = type;
3719 return &construct_function_type->construct_type;
3722 static void fix_declaration_type(declaration_t *declaration)
3724 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3725 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3727 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3728 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3730 if (declaration->type->base.modifiers == type_modifiers)
3733 type_t *copy = duplicate_type(declaration->type);
3734 copy->base.modifiers = type_modifiers;
3736 type_t *result = typehash_insert(copy);
3737 if (result != copy) {
3738 obstack_free(type_obst, copy);
3741 declaration->type = result;
3744 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3745 bool may_be_abstract)
3747 /* construct a single linked list of construct_type_t's which describe
3748 * how to construct the final declarator type */
3749 construct_type_t *first = NULL;
3750 construct_type_t *last = NULL;
3751 gnu_attribute_t *attributes = NULL;
3753 decl_modifiers_t modifiers = parse_attributes(&attributes);
3756 while (token.type == '*') {
3757 construct_type_t *type = parse_pointer_declarator();
3767 /* TODO: find out if this is correct */
3768 modifiers |= parse_attributes(&attributes);
3771 construct_type_t *inner_types = NULL;
3773 switch(token.type) {
3775 if (declaration == NULL) {
3776 errorf(HERE, "no identifier expected in typename");
3778 declaration->symbol = token.v.symbol;
3779 declaration->source_position = token.source_position;
3785 add_anchor_token(')');
3786 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3787 rem_anchor_token(')');
3791 if (may_be_abstract)
3793 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3794 /* avoid a loop in the outermost scope, because eat_statement doesn't
3796 if (token.type == '}' && current_function == NULL) {
3804 construct_type_t *p = last;
3807 construct_type_t *type;
3808 switch(token.type) {
3810 type = parse_function_declarator(declaration);
3813 type = parse_array_declarator();
3816 goto declarator_finished;
3819 /* insert in the middle of the list (behind p) */
3821 type->next = p->next;
3832 declarator_finished:
3833 /* append inner_types at the end of the list, we don't to set last anymore
3834 * as it's not needed anymore */
3836 assert(first == NULL);
3837 first = inner_types;
3839 last->next = inner_types;
3847 static void parse_declaration_attributes(declaration_t *declaration)
3849 gnu_attribute_t *attributes = NULL;
3850 decl_modifiers_t modifiers = parse_attributes(&attributes);
3852 if (declaration == NULL)
3855 declaration->modifiers |= modifiers;
3856 /* check if we have these stupid mode attributes... */
3857 type_t *old_type = declaration->type;
3858 if (old_type == NULL)
3861 gnu_attribute_t *attribute = attributes;
3862 for ( ; attribute != NULL; attribute = attribute->next) {
3863 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
3866 atomic_type_kind_t akind = attribute->u.akind;
3867 if (!is_type_signed(old_type)) {
3869 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
3870 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
3871 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
3872 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
3874 panic("invalid akind in mode attribute");
3878 = make_atomic_type(akind, old_type->base.qualifiers);
3882 static type_t *construct_declarator_type(construct_type_t *construct_list,
3885 construct_type_t *iter = construct_list;
3886 for( ; iter != NULL; iter = iter->next) {
3887 switch(iter->kind) {
3888 case CONSTRUCT_INVALID:
3889 internal_errorf(HERE, "invalid type construction found");
3890 case CONSTRUCT_FUNCTION: {
3891 construct_function_type_t *construct_function_type
3892 = (construct_function_type_t*) iter;
3894 type_t *function_type = construct_function_type->function_type;
3896 function_type->function.return_type = type;
3898 type_t *skipped_return_type = skip_typeref(type);
3899 if (is_type_function(skipped_return_type)) {
3900 errorf(HERE, "function returning function is not allowed");
3901 type = type_error_type;
3902 } else if (is_type_array(skipped_return_type)) {
3903 errorf(HERE, "function returning array is not allowed");
3904 type = type_error_type;
3906 type = function_type;
3911 case CONSTRUCT_POINTER: {
3912 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3913 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3914 pointer_type->pointer.points_to = type;
3915 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3917 type = pointer_type;
3921 case CONSTRUCT_ARRAY: {
3922 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3923 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3925 expression_t *size_expression = parsed_array->size;
3926 if (size_expression != NULL) {
3928 = create_implicit_cast(size_expression, type_size_t);
3931 array_type->base.qualifiers = parsed_array->type_qualifiers;
3932 array_type->array.element_type = type;
3933 array_type->array.is_static = parsed_array->is_static;
3934 array_type->array.is_variable = parsed_array->is_variable;
3935 array_type->array.size_expression = size_expression;
3937 if (size_expression != NULL) {
3938 if (is_constant_expression(size_expression)) {
3939 array_type->array.size_constant = true;
3940 array_type->array.size
3941 = fold_constant(size_expression);
3943 array_type->array.is_vla = true;
3947 type_t *skipped_type = skip_typeref(type);
3948 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3949 errorf(HERE, "array of void is not allowed");
3950 type = type_error_type;
3958 type_t *hashed_type = typehash_insert(type);
3959 if (hashed_type != type) {
3960 /* the function type was constructed earlier freeing it here will
3961 * destroy other types... */
3962 if (iter->kind != CONSTRUCT_FUNCTION) {
3972 static declaration_t *parse_declarator(
3973 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3975 declaration_t *const declaration = allocate_declaration_zero();
3976 declaration->declared_storage_class = specifiers->declared_storage_class;
3977 declaration->modifiers = specifiers->modifiers;
3978 declaration->deprecated = specifiers->deprecated;
3979 declaration->deprecated_string = specifiers->deprecated_string;
3980 declaration->get_property_sym = specifiers->get_property_sym;
3981 declaration->put_property_sym = specifiers->put_property_sym;
3982 declaration->is_inline = specifiers->is_inline;
3984 declaration->storage_class = specifiers->declared_storage_class;
3985 if (declaration->storage_class == STORAGE_CLASS_NONE
3986 && scope != global_scope) {
3987 declaration->storage_class = STORAGE_CLASS_AUTO;
3990 if (specifiers->alignment != 0) {
3991 /* TODO: add checks here */
3992 declaration->alignment = specifiers->alignment;
3995 construct_type_t *construct_type
3996 = parse_inner_declarator(declaration, may_be_abstract);
3997 type_t *const type = specifiers->type;
3998 declaration->type = construct_declarator_type(construct_type, type);
4000 parse_declaration_attributes(declaration);
4002 fix_declaration_type(declaration);
4004 if (construct_type != NULL) {
4005 obstack_free(&temp_obst, construct_type);
4011 static type_t *parse_abstract_declarator(type_t *base_type)
4013 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4015 type_t *result = construct_declarator_type(construct_type, base_type);
4016 if (construct_type != NULL) {
4017 obstack_free(&temp_obst, construct_type);
4023 static declaration_t *append_declaration(declaration_t* const declaration)
4025 if (last_declaration != NULL) {
4026 last_declaration->next = declaration;
4028 scope->declarations = declaration;
4030 last_declaration = declaration;
4035 * Check if the declaration of main is suspicious. main should be a
4036 * function with external linkage, returning int, taking either zero
4037 * arguments, two, or three arguments of appropriate types, ie.
4039 * int main([ int argc, char **argv [, char **env ] ]).
4041 * @param decl the declaration to check
4042 * @param type the function type of the declaration
4044 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4046 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4047 warningf(&decl->source_position,
4048 "'main' is normally a non-static function");
4050 if (skip_typeref(func_type->return_type) != type_int) {
4051 warningf(&decl->source_position,
4052 "return type of 'main' should be 'int', but is '%T'",
4053 func_type->return_type);
4055 const function_parameter_t *parm = func_type->parameters;
4057 type_t *const first_type = parm->type;
4058 if (!types_compatible(skip_typeref(first_type), type_int)) {
4059 warningf(&decl->source_position,
4060 "first argument of 'main' should be 'int', but is '%T'", first_type);
4064 type_t *const second_type = parm->type;
4065 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4066 warningf(&decl->source_position,
4067 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4071 type_t *const third_type = parm->type;
4072 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4073 warningf(&decl->source_position,
4074 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4078 goto warn_arg_count;
4082 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4088 * Check if a symbol is the equal to "main".
4090 static bool is_sym_main(const symbol_t *const sym)
4092 return strcmp(sym->string, "main") == 0;
4095 static declaration_t *internal_record_declaration(
4096 declaration_t *const declaration,
4097 const bool is_definition)
4099 const symbol_t *const symbol = declaration->symbol;
4100 const namespace_t namespc = (namespace_t)declaration->namespc;
4102 assert(declaration->symbol != NULL);
4103 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4105 type_t *const orig_type = declaration->type;
4106 type_t *const type = skip_typeref(orig_type);
4107 if (is_type_function(type) &&
4108 type->function.unspecified_parameters &&
4109 warning.strict_prototypes &&
4110 previous_declaration == NULL) {
4111 warningf(&declaration->source_position,
4112 "function declaration '%#T' is not a prototype",
4113 orig_type, declaration->symbol);
4116 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4117 check_type_of_main(declaration, &type->function);
4120 assert(declaration != previous_declaration);
4121 if (previous_declaration != NULL
4122 && previous_declaration->parent_scope == scope) {
4123 /* can happen for K&R style declarations */
4124 if (previous_declaration->type == NULL) {
4125 previous_declaration->type = declaration->type;
4128 const type_t *prev_type = skip_typeref(previous_declaration->type);
4129 if (!types_compatible(type, prev_type)) {
4130 errorf(&declaration->source_position,
4131 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4132 orig_type, symbol, previous_declaration->type, symbol,
4133 &previous_declaration->source_position);
4135 unsigned old_storage_class = previous_declaration->storage_class;
4136 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4137 errorf(&declaration->source_position,
4138 "redeclaration of enum entry '%Y' (declared %P)",
4139 symbol, &previous_declaration->source_position);
4140 return previous_declaration;
4143 if (warning.redundant_decls &&
4145 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4146 !(previous_declaration->modifiers & DM_USED) &&
4147 !previous_declaration->used) {
4148 warningf(&previous_declaration->source_position,
4149 "unnecessary static forward declaration for '%#T'",
4150 previous_declaration->type, symbol);
4153 unsigned new_storage_class = declaration->storage_class;
4155 if (is_type_incomplete(prev_type)) {
4156 previous_declaration->type = type;
4160 /* pretend no storage class means extern for function
4161 * declarations (except if the previous declaration is neither
4162 * none nor extern) */
4163 if (is_type_function(type)) {
4164 if (prev_type->function.unspecified_parameters) {
4165 previous_declaration->type = type;
4169 switch (old_storage_class) {
4170 case STORAGE_CLASS_NONE:
4171 old_storage_class = STORAGE_CLASS_EXTERN;
4174 case STORAGE_CLASS_EXTERN:
4175 if (is_definition) {
4176 if (warning.missing_prototypes &&
4177 prev_type->function.unspecified_parameters &&
4178 !is_sym_main(symbol)) {
4179 warningf(&declaration->source_position,
4180 "no previous prototype for '%#T'",
4183 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4184 new_storage_class = STORAGE_CLASS_EXTERN;
4193 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4194 new_storage_class == STORAGE_CLASS_EXTERN) {
4195 warn_redundant_declaration:
4196 if (!is_definition &&
4197 warning.redundant_decls &&
4198 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4199 warningf(&declaration->source_position,
4200 "redundant declaration for '%Y' (declared %P)",
4201 symbol, &previous_declaration->source_position);
4203 } else if (current_function == NULL) {
4204 if (old_storage_class != STORAGE_CLASS_STATIC &&
4205 new_storage_class == STORAGE_CLASS_STATIC) {
4206 errorf(&declaration->source_position,
4207 "static declaration of '%Y' follows non-static declaration (declared %P)",
4208 symbol, &previous_declaration->source_position);
4209 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4210 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4211 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4213 goto warn_redundant_declaration;
4215 } else if (old_storage_class == new_storage_class) {
4216 errorf(&declaration->source_position,
4217 "redeclaration of '%Y' (declared %P)",
4218 symbol, &previous_declaration->source_position);
4220 errorf(&declaration->source_position,
4221 "redeclaration of '%Y' with different linkage (declared %P)",
4222 symbol, &previous_declaration->source_position);
4226 if (declaration->is_inline)
4227 previous_declaration->is_inline = true;
4228 return previous_declaration;
4229 } else if (is_type_function(type)) {
4230 if (is_definition &&
4231 declaration->storage_class != STORAGE_CLASS_STATIC) {
4232 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4233 warningf(&declaration->source_position,
4234 "no previous prototype for '%#T'", orig_type, symbol);
4235 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4236 warningf(&declaration->source_position,
4237 "no previous declaration for '%#T'", orig_type,
4242 if (warning.missing_declarations &&
4243 scope == global_scope && (
4244 declaration->storage_class == STORAGE_CLASS_NONE ||
4245 declaration->storage_class == STORAGE_CLASS_THREAD
4247 warningf(&declaration->source_position,
4248 "no previous declaration for '%#T'", orig_type, symbol);
4252 assert(declaration->parent_scope == NULL);
4253 assert(scope != NULL);
4255 declaration->parent_scope = scope;
4257 environment_push(declaration);
4258 return append_declaration(declaration);
4261 static declaration_t *record_declaration(declaration_t *declaration)
4263 return internal_record_declaration(declaration, false);
4266 static declaration_t *record_definition(declaration_t *declaration)
4268 return internal_record_declaration(declaration, true);
4271 static void parser_error_multiple_definition(declaration_t *declaration,
4272 const source_position_t *source_position)
4274 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4275 declaration->symbol, &declaration->source_position);
4278 static bool is_declaration_specifier(const token_t *token,
4279 bool only_specifiers_qualifiers)
4281 switch(token->type) {
4286 return is_typedef_symbol(token->v.symbol);
4288 case T___extension__:
4290 return !only_specifiers_qualifiers;
4297 static void parse_init_declarator_rest(declaration_t *declaration)
4301 type_t *orig_type = declaration->type;
4302 type_t *type = skip_typeref(orig_type);
4304 if (declaration->init.initializer != NULL) {
4305 parser_error_multiple_definition(declaration, HERE);
4308 bool must_be_constant = false;
4309 if (declaration->storage_class == STORAGE_CLASS_STATIC
4310 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4311 || declaration->parent_scope == global_scope) {
4312 must_be_constant = true;
4315 parse_initializer_env_t env;
4316 env.type = orig_type;
4317 env.must_be_constant = must_be_constant;
4318 env.declaration = declaration;
4320 initializer_t *initializer = parse_initializer(&env);
4322 if (env.type != orig_type) {
4323 orig_type = env.type;
4324 type = skip_typeref(orig_type);
4325 declaration->type = env.type;
4328 if (is_type_function(type)) {
4329 errorf(&declaration->source_position,
4330 "initializers not allowed for function types at declator '%Y' (type '%T')",
4331 declaration->symbol, orig_type);
4333 declaration->init.initializer = initializer;
4337 /* parse rest of a declaration without any declarator */
4338 static void parse_anonymous_declaration_rest(
4339 const declaration_specifiers_t *specifiers,
4340 parsed_declaration_func finished_declaration)
4344 declaration_t *const declaration = allocate_declaration_zero();
4345 declaration->type = specifiers->type;
4346 declaration->declared_storage_class = specifiers->declared_storage_class;
4347 declaration->source_position = specifiers->source_position;
4348 declaration->modifiers = specifiers->modifiers;
4350 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4351 warningf(&declaration->source_position,
4352 "useless storage class in empty declaration");
4354 declaration->storage_class = STORAGE_CLASS_NONE;
4356 type_t *type = declaration->type;
4357 switch (type->kind) {
4358 case TYPE_COMPOUND_STRUCT:
4359 case TYPE_COMPOUND_UNION: {
4360 if (type->compound.declaration->symbol == NULL) {
4361 warningf(&declaration->source_position,
4362 "unnamed struct/union that defines no instances");
4371 warningf(&declaration->source_position, "empty declaration");
4375 finished_declaration(declaration);
4378 static void parse_declaration_rest(declaration_t *ndeclaration,
4379 const declaration_specifiers_t *specifiers,
4380 parsed_declaration_func finished_declaration)
4382 add_anchor_token(';');
4383 add_anchor_token('=');
4384 add_anchor_token(',');
4386 declaration_t *declaration = finished_declaration(ndeclaration);
4388 type_t *orig_type = declaration->type;
4389 type_t *type = skip_typeref(orig_type);
4391 if (type->kind != TYPE_FUNCTION &&
4392 declaration->is_inline &&
4393 is_type_valid(type)) {
4394 warningf(&declaration->source_position,
4395 "variable '%Y' declared 'inline'\n", declaration->symbol);
4398 if (token.type == '=') {
4399 parse_init_declarator_rest(declaration);
4402 if (token.type != ',')
4406 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4411 rem_anchor_token(';');
4412 rem_anchor_token('=');
4413 rem_anchor_token(',');
4416 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4418 symbol_t *symbol = declaration->symbol;
4419 if (symbol == NULL) {
4420 errorf(HERE, "anonymous declaration not valid as function parameter");
4423 namespace_t namespc = (namespace_t) declaration->namespc;
4424 if (namespc != NAMESPACE_NORMAL) {
4425 return record_declaration(declaration);
4428 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4429 if (previous_declaration == NULL ||
4430 previous_declaration->parent_scope != scope) {
4431 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4436 if (previous_declaration->type == NULL) {
4437 previous_declaration->type = declaration->type;
4438 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4439 previous_declaration->storage_class = declaration->storage_class;
4440 previous_declaration->parent_scope = scope;
4441 return previous_declaration;
4443 return record_declaration(declaration);
4447 static void parse_declaration(parsed_declaration_func finished_declaration)
4449 declaration_specifiers_t specifiers;
4450 memset(&specifiers, 0, sizeof(specifiers));
4451 parse_declaration_specifiers(&specifiers);
4453 if (token.type == ';') {
4454 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4456 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4457 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4461 static type_t *get_default_promoted_type(type_t *orig_type)
4463 type_t *result = orig_type;
4465 type_t *type = skip_typeref(orig_type);
4466 if (is_type_integer(type)) {
4467 result = promote_integer(type);
4468 } else if (type == type_float) {
4469 result = type_double;
4475 static void parse_kr_declaration_list(declaration_t *declaration)
4477 type_t *type = skip_typeref(declaration->type);
4478 if (!is_type_function(type))
4481 if (!type->function.kr_style_parameters)
4484 /* push function parameters */
4485 int top = environment_top();
4486 scope_t *last_scope = scope;
4487 set_scope(&declaration->scope);
4489 declaration_t *parameter = declaration->scope.declarations;
4490 for ( ; parameter != NULL; parameter = parameter->next) {
4491 assert(parameter->parent_scope == NULL);
4492 parameter->parent_scope = scope;
4493 environment_push(parameter);
4496 /* parse declaration list */
4497 while (is_declaration_specifier(&token, false)) {
4498 parse_declaration(finished_kr_declaration);
4501 /* pop function parameters */
4502 assert(scope == &declaration->scope);
4503 set_scope(last_scope);
4504 environment_pop_to(top);
4506 /* update function type */
4507 type_t *new_type = duplicate_type(type);
4509 function_parameter_t *parameters = NULL;
4510 function_parameter_t *last_parameter = NULL;
4512 declaration_t *parameter_declaration = declaration->scope.declarations;
4513 for( ; parameter_declaration != NULL;
4514 parameter_declaration = parameter_declaration->next) {
4515 type_t *parameter_type = parameter_declaration->type;
4516 if (parameter_type == NULL) {
4518 errorf(HERE, "no type specified for function parameter '%Y'",
4519 parameter_declaration->symbol);
4521 if (warning.implicit_int) {
4522 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4523 parameter_declaration->symbol);
4525 parameter_type = type_int;
4526 parameter_declaration->type = parameter_type;
4530 semantic_parameter(parameter_declaration);
4531 parameter_type = parameter_declaration->type;
4534 * we need the default promoted types for the function type
4536 parameter_type = get_default_promoted_type(parameter_type);
4538 function_parameter_t *function_parameter
4539 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4540 memset(function_parameter, 0, sizeof(function_parameter[0]));
4542 function_parameter->type = parameter_type;
4543 if (last_parameter != NULL) {
4544 last_parameter->next = function_parameter;
4546 parameters = function_parameter;
4548 last_parameter = function_parameter;
4551 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4553 new_type->function.parameters = parameters;
4554 new_type->function.unspecified_parameters = true;
4556 type = typehash_insert(new_type);
4557 if (type != new_type) {
4558 obstack_free(type_obst, new_type);
4561 declaration->type = type;
4564 static bool first_err = true;
4567 * When called with first_err set, prints the name of the current function,
4570 static void print_in_function(void)
4574 diagnosticf("%s: In function '%Y':\n",
4575 current_function->source_position.input_name,
4576 current_function->symbol);
4581 * Check if all labels are defined in the current function.
4582 * Check if all labels are used in the current function.
4584 static void check_labels(void)
4586 for (const goto_statement_t *goto_statement = goto_first;
4587 goto_statement != NULL;
4588 goto_statement = goto_statement->next) {
4589 declaration_t *label = goto_statement->label;
4592 if (label->source_position.input_name == NULL) {
4593 print_in_function();
4594 errorf(&goto_statement->base.source_position,
4595 "label '%Y' used but not defined", label->symbol);
4598 goto_first = goto_last = NULL;
4600 if (warning.unused_label) {
4601 for (const label_statement_t *label_statement = label_first;
4602 label_statement != NULL;
4603 label_statement = label_statement->next) {
4604 const declaration_t *label = label_statement->label;
4606 if (! label->used) {
4607 print_in_function();
4608 warningf(&label_statement->base.source_position,
4609 "label '%Y' defined but not used", label->symbol);
4613 label_first = label_last = NULL;
4617 * Check declarations of current_function for unused entities.
4619 static void check_declarations(void)
4621 if (warning.unused_parameter) {
4622 const scope_t *scope = ¤t_function->scope;
4624 const declaration_t *parameter = scope->declarations;
4625 for (; parameter != NULL; parameter = parameter->next) {
4626 if (! parameter->used) {
4627 print_in_function();
4628 warningf(¶meter->source_position,
4629 "unused parameter '%Y'", parameter->symbol);
4633 if (warning.unused_variable) {
4637 static void parse_external_declaration(void)
4639 /* function-definitions and declarations both start with declaration
4641 declaration_specifiers_t specifiers;
4642 memset(&specifiers, 0, sizeof(specifiers));
4644 add_anchor_token(';');
4645 parse_declaration_specifiers(&specifiers);
4646 rem_anchor_token(';');
4648 /* must be a declaration */
4649 if (token.type == ';') {
4650 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4654 add_anchor_token(',');
4655 add_anchor_token('=');
4656 rem_anchor_token(';');
4658 /* declarator is common to both function-definitions and declarations */
4659 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4661 rem_anchor_token(',');
4662 rem_anchor_token('=');
4663 rem_anchor_token(';');
4665 /* must be a declaration */
4666 switch (token.type) {
4669 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4673 parse_declaration_rest(ndeclaration, &specifiers, record_definition);
4677 /* must be a function definition */
4678 parse_kr_declaration_list(ndeclaration);
4680 if (token.type != '{') {
4681 parse_error_expected("while parsing function definition", '{', NULL);
4682 eat_until_matching_token(';');
4686 type_t *type = ndeclaration->type;
4688 /* note that we don't skip typerefs: the standard doesn't allow them here
4689 * (so we can't use is_type_function here) */
4690 if (type->kind != TYPE_FUNCTION) {
4691 if (is_type_valid(type)) {
4692 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4693 type, ndeclaration->symbol);
4699 /* § 6.7.5.3 (14) a function definition with () means no
4700 * parameters (and not unspecified parameters) */
4701 if (type->function.unspecified_parameters
4702 && type->function.parameters == NULL
4703 && !type->function.kr_style_parameters) {
4704 type_t *duplicate = duplicate_type(type);
4705 duplicate->function.unspecified_parameters = false;
4707 type = typehash_insert(duplicate);
4708 if (type != duplicate) {
4709 obstack_free(type_obst, duplicate);
4711 ndeclaration->type = type;
4714 declaration_t *const declaration = record_definition(ndeclaration);
4715 if (ndeclaration != declaration) {
4716 declaration->scope = ndeclaration->scope;
4718 type = skip_typeref(declaration->type);
4720 /* push function parameters and switch scope */
4721 int top = environment_top();
4722 scope_t *last_scope = scope;
4723 set_scope(&declaration->scope);
4725 declaration_t *parameter = declaration->scope.declarations;
4726 for( ; parameter != NULL; parameter = parameter->next) {
4727 if (parameter->parent_scope == &ndeclaration->scope) {
4728 parameter->parent_scope = scope;
4730 assert(parameter->parent_scope == NULL
4731 || parameter->parent_scope == scope);
4732 parameter->parent_scope = scope;
4733 if (parameter->symbol == NULL) {
4734 errorf(&ndeclaration->source_position, "parameter name omitted");
4737 environment_push(parameter);
4740 if (declaration->init.statement != NULL) {
4741 parser_error_multiple_definition(declaration, HERE);
4744 /* parse function body */
4745 int label_stack_top = label_top();
4746 declaration_t *old_current_function = current_function;
4747 current_function = declaration;
4749 declaration->init.statement = parse_compound_statement(false);
4752 check_declarations();
4754 assert(current_function == declaration);
4755 current_function = old_current_function;
4756 label_pop_to(label_stack_top);
4759 assert(scope == &declaration->scope);
4760 set_scope(last_scope);
4761 environment_pop_to(top);
4764 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4765 source_position_t *source_position)
4767 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4769 type->bitfield.base_type = base_type;
4770 type->bitfield.size = size;
4775 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4778 declaration_t *iter = compound_declaration->scope.declarations;
4779 for( ; iter != NULL; iter = iter->next) {
4780 if (iter->namespc != NAMESPACE_NORMAL)
4783 if (iter->symbol == NULL) {
4784 type_t *type = skip_typeref(iter->type);
4785 if (is_type_compound(type)) {
4786 declaration_t *result
4787 = find_compound_entry(type->compound.declaration, symbol);
4794 if (iter->symbol == symbol) {
4802 static void parse_compound_declarators(declaration_t *struct_declaration,
4803 const declaration_specifiers_t *specifiers)
4805 declaration_t *last_declaration = struct_declaration->scope.declarations;
4806 if (last_declaration != NULL) {
4807 while(last_declaration->next != NULL) {
4808 last_declaration = last_declaration->next;
4813 declaration_t *declaration;
4815 if (token.type == ':') {
4816 source_position_t source_position = *HERE;
4819 type_t *base_type = specifiers->type;
4820 expression_t *size = parse_constant_expression();
4822 if (!is_type_integer(skip_typeref(base_type))) {
4823 errorf(HERE, "bitfield base type '%T' is not an integer type",
4827 type_t *type = make_bitfield_type(base_type, size, &source_position);
4829 declaration = allocate_declaration_zero();
4830 declaration->namespc = NAMESPACE_NORMAL;
4831 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4832 declaration->storage_class = STORAGE_CLASS_NONE;
4833 declaration->source_position = source_position;
4834 declaration->modifiers = specifiers->modifiers;
4835 declaration->type = type;
4837 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4839 type_t *orig_type = declaration->type;
4840 type_t *type = skip_typeref(orig_type);
4842 if (token.type == ':') {
4843 source_position_t source_position = *HERE;
4845 expression_t *size = parse_constant_expression();
4847 if (!is_type_integer(type)) {
4848 errorf(HERE, "bitfield base type '%T' is not an "
4849 "integer type", orig_type);
4852 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4853 declaration->type = bitfield_type;
4855 /* TODO we ignore arrays for now... what is missing is a check
4856 * that they're at the end of the struct */
4857 if (is_type_incomplete(type) && !is_type_array(type)) {
4859 "compound member '%Y' has incomplete type '%T'",
4860 declaration->symbol, orig_type);
4861 } else if (is_type_function(type)) {
4862 errorf(HERE, "compound member '%Y' must not have function "
4863 "type '%T'", declaration->symbol, orig_type);
4868 /* make sure we don't define a symbol multiple times */
4869 symbol_t *symbol = declaration->symbol;
4870 if (symbol != NULL) {
4871 declaration_t *prev_decl
4872 = find_compound_entry(struct_declaration, symbol);
4874 if (prev_decl != NULL) {
4875 assert(prev_decl->symbol == symbol);
4876 errorf(&declaration->source_position,
4877 "multiple declarations of symbol '%Y' (declared %P)",
4878 symbol, &prev_decl->source_position);
4882 /* append declaration */
4883 if (last_declaration != NULL) {
4884 last_declaration->next = declaration;
4886 struct_declaration->scope.declarations = declaration;
4888 last_declaration = declaration;
4890 if (token.type != ',')
4900 static void parse_compound_type_entries(declaration_t *compound_declaration)
4903 add_anchor_token('}');
4905 while(token.type != '}' && token.type != T_EOF) {
4906 declaration_specifiers_t specifiers;
4907 memset(&specifiers, 0, sizeof(specifiers));
4908 parse_declaration_specifiers(&specifiers);
4910 parse_compound_declarators(compound_declaration, &specifiers);
4912 rem_anchor_token('}');
4914 if (token.type == T_EOF) {
4915 errorf(HERE, "EOF while parsing struct");
4920 static type_t *parse_typename(void)
4922 declaration_specifiers_t specifiers;
4923 memset(&specifiers, 0, sizeof(specifiers));
4924 parse_declaration_specifiers(&specifiers);
4925 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4926 /* TODO: improve error message, user does probably not know what a
4927 * storage class is...
4929 errorf(HERE, "typename may not have a storage class");
4932 type_t *result = parse_abstract_declarator(specifiers.type);
4940 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4941 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4942 expression_t *left);
4944 typedef struct expression_parser_function_t expression_parser_function_t;
4945 struct expression_parser_function_t {
4946 unsigned precedence;
4947 parse_expression_function parser;
4948 unsigned infix_precedence;
4949 parse_expression_infix_function infix_parser;
4952 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4955 * Prints an error message if an expression was expected but not read
4957 static expression_t *expected_expression_error(void)
4959 /* skip the error message if the error token was read */
4960 if (token.type != T_ERROR) {
4961 errorf(HERE, "expected expression, got token '%K'", &token);
4965 return create_invalid_expression();
4969 * Parse a string constant.
4971 static expression_t *parse_string_const(void)
4974 if (token.type == T_STRING_LITERAL) {
4975 string_t res = token.v.string;
4977 while (token.type == T_STRING_LITERAL) {
4978 res = concat_strings(&res, &token.v.string);
4981 if (token.type != T_WIDE_STRING_LITERAL) {
4982 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4983 /* note: that we use type_char_ptr here, which is already the
4984 * automatic converted type. revert_automatic_type_conversion
4985 * will construct the array type */
4986 cnst->base.type = type_char_ptr;
4987 cnst->string.value = res;
4991 wres = concat_string_wide_string(&res, &token.v.wide_string);
4993 wres = token.v.wide_string;
4998 switch (token.type) {
4999 case T_WIDE_STRING_LITERAL:
5000 wres = concat_wide_strings(&wres, &token.v.wide_string);
5003 case T_STRING_LITERAL:
5004 wres = concat_wide_string_string(&wres, &token.v.string);
5008 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5009 cnst->base.type = type_wchar_t_ptr;
5010 cnst->wide_string.value = wres;
5019 * Parse an integer constant.
5021 static expression_t *parse_int_const(void)
5023 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5024 cnst->base.source_position = *HERE;
5025 cnst->base.type = token.datatype;
5026 cnst->conste.v.int_value = token.v.intvalue;
5034 * Parse a character constant.
5036 static expression_t *parse_character_constant(void)
5038 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5040 cnst->base.source_position = *HERE;
5041 cnst->base.type = token.datatype;
5042 cnst->conste.v.character = token.v.string;
5044 if (cnst->conste.v.character.size != 1) {
5045 if (warning.multichar && (c_mode & _GNUC)) {
5047 warningf(HERE, "multi-character character constant");
5049 errorf(HERE, "more than 1 characters in character constant");
5058 * Parse a wide character constant.
5060 static expression_t *parse_wide_character_constant(void)
5062 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5064 cnst->base.source_position = *HERE;
5065 cnst->base.type = token.datatype;
5066 cnst->conste.v.wide_character = token.v.wide_string;
5068 if (cnst->conste.v.wide_character.size != 1) {
5069 if (warning.multichar && (c_mode & _GNUC)) {
5071 warningf(HERE, "multi-character character constant");
5073 errorf(HERE, "more than 1 characters in character constant");
5082 * Parse a float constant.
5084 static expression_t *parse_float_const(void)
5086 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5087 cnst->base.type = token.datatype;
5088 cnst->conste.v.float_value = token.v.floatvalue;
5095 static declaration_t *create_implicit_function(symbol_t *symbol,
5096 const source_position_t *source_position)
5098 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5099 ntype->function.return_type = type_int;
5100 ntype->function.unspecified_parameters = true;
5102 type_t *type = typehash_insert(ntype);
5103 if (type != ntype) {
5107 declaration_t *const declaration = allocate_declaration_zero();
5108 declaration->storage_class = STORAGE_CLASS_EXTERN;
5109 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5110 declaration->type = type;
5111 declaration->symbol = symbol;
5112 declaration->source_position = *source_position;
5114 bool strict_prototypes_old = warning.strict_prototypes;
5115 warning.strict_prototypes = false;
5116 record_declaration(declaration);
5117 warning.strict_prototypes = strict_prototypes_old;
5123 * Creates a return_type (func)(argument_type) function type if not
5126 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5127 type_t *argument_type2)
5129 function_parameter_t *parameter2
5130 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5131 memset(parameter2, 0, sizeof(parameter2[0]));
5132 parameter2->type = argument_type2;
5134 function_parameter_t *parameter1
5135 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5136 memset(parameter1, 0, sizeof(parameter1[0]));
5137 parameter1->type = argument_type1;
5138 parameter1->next = parameter2;
5140 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5141 type->function.return_type = return_type;
5142 type->function.parameters = parameter1;
5144 type_t *result = typehash_insert(type);
5145 if (result != type) {
5153 * Creates a return_type (func)(argument_type) function type if not
5156 * @param return_type the return type
5157 * @param argument_type the argument type
5159 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5161 function_parameter_t *parameter
5162 = obstack_alloc(type_obst, sizeof(parameter[0]));
5163 memset(parameter, 0, sizeof(parameter[0]));
5164 parameter->type = argument_type;
5166 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5167 type->function.return_type = return_type;
5168 type->function.parameters = parameter;
5170 type_t *result = typehash_insert(type);
5171 if (result != type) {
5178 static type_t *make_function_0_type(type_t *return_type)
5180 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5181 type->function.return_type = return_type;
5182 type->function.parameters = NULL;
5184 type_t *result = typehash_insert(type);
5185 if (result != type) {
5193 * Creates a function type for some function like builtins.
5195 * @param symbol the symbol describing the builtin
5197 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5199 switch(symbol->ID) {
5200 case T___builtin_alloca:
5201 return make_function_1_type(type_void_ptr, type_size_t);
5202 case T___builtin_huge_val:
5203 return make_function_0_type(type_double);
5204 case T___builtin_nan:
5205 return make_function_1_type(type_double, type_char_ptr);
5206 case T___builtin_nanf:
5207 return make_function_1_type(type_float, type_char_ptr);
5208 case T___builtin_nand:
5209 return make_function_1_type(type_long_double, type_char_ptr);
5210 case T___builtin_va_end:
5211 return make_function_1_type(type_void, type_valist);
5212 case T___builtin_expect:
5213 return make_function_2_type(type_long, type_long, type_long);
5215 internal_errorf(HERE, "not implemented builtin symbol found");
5220 * Performs automatic type cast as described in § 6.3.2.1.
5222 * @param orig_type the original type
5224 static type_t *automatic_type_conversion(type_t *orig_type)
5226 type_t *type = skip_typeref(orig_type);
5227 if (is_type_array(type)) {
5228 array_type_t *array_type = &type->array;
5229 type_t *element_type = array_type->element_type;
5230 unsigned qualifiers = array_type->base.qualifiers;
5232 return make_pointer_type(element_type, qualifiers);
5235 if (is_type_function(type)) {
5236 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
5243 * reverts the automatic casts of array to pointer types and function
5244 * to function-pointer types as defined § 6.3.2.1
5246 type_t *revert_automatic_type_conversion(const expression_t *expression)
5248 switch (expression->kind) {
5249 case EXPR_REFERENCE: return expression->reference.declaration->type;
5250 case EXPR_SELECT: return expression->select.compound_entry->type;
5252 case EXPR_UNARY_DEREFERENCE: {
5253 const expression_t *const value = expression->unary.value;
5254 type_t *const type = skip_typeref(value->base.type);
5255 assert(is_type_pointer(type));
5256 return type->pointer.points_to;
5259 case EXPR_BUILTIN_SYMBOL:
5260 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
5262 case EXPR_ARRAY_ACCESS: {
5263 const expression_t *array_ref = expression->array_access.array_ref;
5264 type_t *type_left = skip_typeref(array_ref->base.type);
5265 if (!is_type_valid(type_left))
5267 assert(is_type_pointer(type_left));
5268 return type_left->pointer.points_to;
5271 case EXPR_STRING_LITERAL: {
5272 size_t size = expression->string.value.size;
5273 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
5276 case EXPR_WIDE_STRING_LITERAL: {
5277 size_t size = expression->wide_string.value.size;
5278 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
5281 case EXPR_COMPOUND_LITERAL:
5282 return expression->compound_literal.type;
5287 return expression->base.type;
5290 static expression_t *parse_reference(void)
5292 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
5294 reference_expression_t *ref = &expression->reference;
5295 symbol_t *const symbol = token.v.symbol;
5297 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
5299 source_position_t source_position = token.source_position;
5302 if (declaration == NULL) {
5303 if (! strict_mode && token.type == '(') {
5304 /* an implicitly defined function */
5305 if (warning.implicit_function_declaration) {
5306 warningf(HERE, "implicit declaration of function '%Y'",
5310 declaration = create_implicit_function(symbol,
5313 errorf(HERE, "unknown symbol '%Y' found.", symbol);
5314 return create_invalid_expression();
5318 type_t *type = declaration->type;
5320 /* we always do the auto-type conversions; the & and sizeof parser contains
5321 * code to revert this! */
5322 type = automatic_type_conversion(type);
5324 ref->declaration = declaration;
5325 ref->base.type = type;
5327 /* this declaration is used */
5328 declaration->used = true;
5330 /* check for deprecated functions */
5331 if (declaration->deprecated != 0) {
5332 const char *prefix = "";
5333 if (is_type_function(declaration->type))
5334 prefix = "function ";
5336 if (declaration->deprecated_string != NULL) {
5337 warningf(&source_position,
5338 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
5339 declaration->deprecated_string);
5341 warningf(&source_position,
5342 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
5349 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5353 /* TODO check if explicit cast is allowed and issue warnings/errors */
5356 static expression_t *parse_compound_literal(type_t *type)
5358 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5360 parse_initializer_env_t env;
5362 env.declaration = NULL;
5363 env.must_be_constant = false;
5364 initializer_t *initializer = parse_initializer(&env);
5367 expression->compound_literal.initializer = initializer;
5368 expression->compound_literal.type = type;
5369 expression->base.type = automatic_type_conversion(type);
5375 * Parse a cast expression.
5377 static expression_t *parse_cast(void)
5379 source_position_t source_position = token.source_position;
5381 type_t *type = parse_typename();
5383 /* matching add_anchor_token() is at call site */
5384 rem_anchor_token(')');
5387 if (token.type == '{') {
5388 return parse_compound_literal(type);
5391 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5392 cast->base.source_position = source_position;
5394 expression_t *value = parse_sub_expression(20);
5396 check_cast_allowed(value, type);
5398 cast->base.type = type;
5399 cast->unary.value = value;
5403 return create_invalid_expression();
5407 * Parse a statement expression.
5409 static expression_t *parse_statement_expression(void)
5411 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5413 statement_t *statement = parse_compound_statement(true);
5414 expression->statement.statement = statement;
5415 expression->base.source_position = statement->base.source_position;
5417 /* find last statement and use its type */
5418 type_t *type = type_void;
5419 const statement_t *stmt = statement->compound.statements;
5421 while (stmt->base.next != NULL)
5422 stmt = stmt->base.next;
5424 if (stmt->kind == STATEMENT_EXPRESSION) {
5425 type = stmt->expression.expression->base.type;
5428 warningf(&expression->base.source_position, "empty statement expression ({})");
5430 expression->base.type = type;
5436 return create_invalid_expression();
5440 * Parse a braced expression.
5442 static expression_t *parse_brace_expression(void)
5445 add_anchor_token(')');
5447 switch(token.type) {
5449 /* gcc extension: a statement expression */
5450 return parse_statement_expression();
5454 return parse_cast();
5456 if (is_typedef_symbol(token.v.symbol)) {
5457 return parse_cast();
5461 expression_t *result = parse_expression();
5462 rem_anchor_token(')');
5467 return create_invalid_expression();
5470 static expression_t *parse_function_keyword(void)
5475 if (current_function == NULL) {
5476 errorf(HERE, "'__func__' used outside of a function");
5479 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5480 expression->base.type = type_char_ptr;
5481 expression->funcname.kind = FUNCNAME_FUNCTION;
5486 static expression_t *parse_pretty_function_keyword(void)
5488 eat(T___PRETTY_FUNCTION__);
5490 if (current_function == NULL) {
5491 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5494 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5495 expression->base.type = type_char_ptr;
5496 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5501 static expression_t *parse_funcsig_keyword(void)
5505 if (current_function == NULL) {
5506 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5509 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5510 expression->base.type = type_char_ptr;
5511 expression->funcname.kind = FUNCNAME_FUNCSIG;
5516 static expression_t *parse_funcdname_keyword(void)
5518 eat(T___FUNCDNAME__);
5520 if (current_function == NULL) {
5521 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5524 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5525 expression->base.type = type_char_ptr;
5526 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5531 static designator_t *parse_designator(void)
5533 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5534 result->source_position = *HERE;
5536 if (token.type != T_IDENTIFIER) {
5537 parse_error_expected("while parsing member designator",
5538 T_IDENTIFIER, NULL);
5541 result->symbol = token.v.symbol;
5544 designator_t *last_designator = result;
5546 if (token.type == '.') {
5548 if (token.type != T_IDENTIFIER) {
5549 parse_error_expected("while parsing member designator",
5550 T_IDENTIFIER, NULL);
5553 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5554 designator->source_position = *HERE;
5555 designator->symbol = token.v.symbol;
5558 last_designator->next = designator;
5559 last_designator = designator;
5562 if (token.type == '[') {
5564 add_anchor_token(']');
5565 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5566 designator->source_position = *HERE;
5567 designator->array_index = parse_expression();
5568 rem_anchor_token(']');
5570 if (designator->array_index == NULL) {
5574 last_designator->next = designator;
5575 last_designator = designator;
5587 * Parse the __builtin_offsetof() expression.
5589 static expression_t *parse_offsetof(void)
5591 eat(T___builtin_offsetof);
5593 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5594 expression->base.type = type_size_t;
5597 add_anchor_token(',');
5598 type_t *type = parse_typename();
5599 rem_anchor_token(',');
5601 add_anchor_token(')');
5602 designator_t *designator = parse_designator();
5603 rem_anchor_token(')');
5606 expression->offsetofe.type = type;
5607 expression->offsetofe.designator = designator;
5610 memset(&path, 0, sizeof(path));
5611 path.top_type = type;
5612 path.path = NEW_ARR_F(type_path_entry_t, 0);
5614 descend_into_subtype(&path);
5616 if (!walk_designator(&path, designator, true)) {
5617 return create_invalid_expression();
5620 DEL_ARR_F(path.path);
5624 return create_invalid_expression();
5628 * Parses a _builtin_va_start() expression.
5630 static expression_t *parse_va_start(void)
5632 eat(T___builtin_va_start);
5634 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5637 add_anchor_token(',');
5638 expression->va_starte.ap = parse_assignment_expression();
5639 rem_anchor_token(',');
5641 expression_t *const expr = parse_assignment_expression();
5642 if (expr->kind == EXPR_REFERENCE) {
5643 declaration_t *const decl = expr->reference.declaration;
5645 return create_invalid_expression();
5646 if (decl->parent_scope == ¤t_function->scope &&
5647 decl->next == NULL) {
5648 expression->va_starte.parameter = decl;
5653 errorf(&expr->base.source_position,
5654 "second argument of 'va_start' must be last parameter of the current function");
5656 return create_invalid_expression();
5660 * Parses a _builtin_va_arg() expression.
5662 static expression_t *parse_va_arg(void)
5664 eat(T___builtin_va_arg);
5666 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5669 expression->va_arge.ap = parse_assignment_expression();
5671 expression->base.type = parse_typename();
5676 return create_invalid_expression();
5679 static expression_t *parse_builtin_symbol(void)
5681 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5683 symbol_t *symbol = token.v.symbol;
5685 expression->builtin_symbol.symbol = symbol;
5688 type_t *type = get_builtin_symbol_type(symbol);
5689 type = automatic_type_conversion(type);
5691 expression->base.type = type;
5696 * Parses a __builtin_constant() expression.
5698 static expression_t *parse_builtin_constant(void)
5700 eat(T___builtin_constant_p);
5702 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5705 add_anchor_token(')');
5706 expression->builtin_constant.value = parse_assignment_expression();
5707 rem_anchor_token(')');
5709 expression->base.type = type_int;
5713 return create_invalid_expression();
5717 * Parses a __builtin_prefetch() expression.
5719 static expression_t *parse_builtin_prefetch(void)
5721 eat(T___builtin_prefetch);
5723 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5726 add_anchor_token(')');
5727 expression->builtin_prefetch.adr = parse_assignment_expression();
5728 if (token.type == ',') {
5730 expression->builtin_prefetch.rw = parse_assignment_expression();
5732 if (token.type == ',') {
5734 expression->builtin_prefetch.locality = parse_assignment_expression();
5736 rem_anchor_token(')');
5738 expression->base.type = type_void;
5742 return create_invalid_expression();
5746 * Parses a __builtin_is_*() compare expression.
5748 static expression_t *parse_compare_builtin(void)
5750 expression_t *expression;
5752 switch(token.type) {
5753 case T___builtin_isgreater:
5754 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5756 case T___builtin_isgreaterequal:
5757 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5759 case T___builtin_isless:
5760 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5762 case T___builtin_islessequal:
5763 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5765 case T___builtin_islessgreater:
5766 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5768 case T___builtin_isunordered:
5769 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5772 internal_errorf(HERE, "invalid compare builtin found");
5775 expression->base.source_position = *HERE;
5779 expression->binary.left = parse_assignment_expression();
5781 expression->binary.right = parse_assignment_expression();
5784 type_t *const orig_type_left = expression->binary.left->base.type;
5785 type_t *const orig_type_right = expression->binary.right->base.type;
5787 type_t *const type_left = skip_typeref(orig_type_left);
5788 type_t *const type_right = skip_typeref(orig_type_right);
5789 if (!is_type_float(type_left) && !is_type_float(type_right)) {
5790 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5791 type_error_incompatible("invalid operands in comparison",
5792 &expression->base.source_position, orig_type_left, orig_type_right);
5795 semantic_comparison(&expression->binary);
5800 return create_invalid_expression();
5805 * Parses a __builtin_expect() expression.
5807 static expression_t *parse_builtin_expect(void)
5809 eat(T___builtin_expect);
5811 expression_t *expression
5812 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5815 expression->binary.left = parse_assignment_expression();
5817 expression->binary.right = parse_constant_expression();
5820 expression->base.type = expression->binary.left->base.type;
5824 return create_invalid_expression();
5829 * Parses a MS assume() expression.
5831 static expression_t *parse_assume(void)
5835 expression_t *expression
5836 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5839 add_anchor_token(')');
5840 expression->unary.value = parse_assignment_expression();
5841 rem_anchor_token(')');
5844 expression->base.type = type_void;
5847 return create_invalid_expression();
5851 * Parse a microsoft __noop expression.
5853 static expression_t *parse_noop_expression(void)
5855 source_position_t source_position = *HERE;
5858 if (token.type == '(') {
5859 /* parse arguments */
5861 add_anchor_token(')');
5862 add_anchor_token(',');
5864 if (token.type != ')') {
5866 (void)parse_assignment_expression();
5867 if (token.type != ',')
5873 rem_anchor_token(',');
5874 rem_anchor_token(')');
5877 /* the result is a (int)0 */
5878 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5879 cnst->base.source_position = source_position;
5880 cnst->base.type = type_int;
5881 cnst->conste.v.int_value = 0;
5882 cnst->conste.is_ms_noop = true;
5887 return create_invalid_expression();
5891 * Parses a primary expression.
5893 static expression_t *parse_primary_expression(void)
5895 switch (token.type) {
5896 case T_INTEGER: return parse_int_const();
5897 case T_CHARACTER_CONSTANT: return parse_character_constant();
5898 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5899 case T_FLOATINGPOINT: return parse_float_const();
5900 case T_STRING_LITERAL:
5901 case T_WIDE_STRING_LITERAL: return parse_string_const();
5902 case T_IDENTIFIER: return parse_reference();
5903 case T___FUNCTION__:
5904 case T___func__: return parse_function_keyword();
5905 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5906 case T___FUNCSIG__: return parse_funcsig_keyword();
5907 case T___FUNCDNAME__: return parse_funcdname_keyword();
5908 case T___builtin_offsetof: return parse_offsetof();
5909 case T___builtin_va_start: return parse_va_start();
5910 case T___builtin_va_arg: return parse_va_arg();
5911 case T___builtin_expect:
5912 case T___builtin_alloca:
5913 case T___builtin_nan:
5914 case T___builtin_nand:
5915 case T___builtin_nanf:
5916 case T___builtin_huge_val:
5917 case T___builtin_va_end: return parse_builtin_symbol();
5918 case T___builtin_isgreater:
5919 case T___builtin_isgreaterequal:
5920 case T___builtin_isless:
5921 case T___builtin_islessequal:
5922 case T___builtin_islessgreater:
5923 case T___builtin_isunordered: return parse_compare_builtin();
5924 case T___builtin_constant_p: return parse_builtin_constant();
5925 case T___builtin_prefetch: return parse_builtin_prefetch();
5926 case T__assume: return parse_assume();
5928 case '(': return parse_brace_expression();
5929 case T___noop: return parse_noop_expression();
5932 errorf(HERE, "unexpected token %K, expected an expression", &token);
5933 return create_invalid_expression();
5937 * Check if the expression has the character type and issue a warning then.
5939 static void check_for_char_index_type(const expression_t *expression)
5941 type_t *const type = expression->base.type;
5942 const type_t *const base_type = skip_typeref(type);
5944 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5945 warning.char_subscripts) {
5946 warningf(&expression->base.source_position,
5947 "array subscript has type '%T'", type);
5951 static expression_t *parse_array_expression(unsigned precedence,
5957 add_anchor_token(']');
5959 expression_t *inside = parse_expression();
5961 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5963 array_access_expression_t *array_access = &expression->array_access;
5965 type_t *const orig_type_left = left->base.type;
5966 type_t *const orig_type_inside = inside->base.type;
5968 type_t *const type_left = skip_typeref(orig_type_left);
5969 type_t *const type_inside = skip_typeref(orig_type_inside);
5971 type_t *return_type;
5972 if (is_type_pointer(type_left)) {
5973 return_type = type_left->pointer.points_to;
5974 array_access->array_ref = left;
5975 array_access->index = inside;
5976 check_for_char_index_type(inside);
5977 } else if (is_type_pointer(type_inside)) {
5978 return_type = type_inside->pointer.points_to;
5979 array_access->array_ref = inside;
5980 array_access->index = left;
5981 array_access->flipped = true;
5982 check_for_char_index_type(left);
5984 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5986 "array access on object with non-pointer types '%T', '%T'",
5987 orig_type_left, orig_type_inside);
5989 return_type = type_error_type;
5990 array_access->array_ref = create_invalid_expression();
5993 rem_anchor_token(']');
5994 if (token.type != ']') {
5995 parse_error_expected("Problem while parsing array access", ']', NULL);
6000 return_type = automatic_type_conversion(return_type);
6001 expression->base.type = return_type;
6006 static expression_t *parse_typeprop(expression_kind_t const kind,
6007 source_position_t const pos,
6008 unsigned const precedence)
6010 expression_t *tp_expression = allocate_expression_zero(kind);
6011 tp_expression->base.type = type_size_t;
6012 tp_expression->base.source_position = pos;
6014 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6016 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6018 add_anchor_token(')');
6019 type_t* const orig_type = parse_typename();
6020 tp_expression->typeprop.type = orig_type;
6022 type_t const* const type = skip_typeref(orig_type);
6023 char const* const wrong_type =
6024 is_type_incomplete(type) ? "incomplete" :
6025 type->kind == TYPE_FUNCTION ? "function designator" :
6026 type->kind == TYPE_BITFIELD ? "bitfield" :
6028 if (wrong_type != NULL) {
6029 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6030 what, wrong_type, type);
6033 rem_anchor_token(')');
6036 expression_t *expression = parse_sub_expression(precedence);
6038 type_t* const orig_type = revert_automatic_type_conversion(expression);
6039 expression->base.type = orig_type;
6041 type_t const* const type = skip_typeref(orig_type);
6042 char const* const wrong_type =
6043 is_type_incomplete(type) ? "incomplete" :
6044 type->kind == TYPE_FUNCTION ? "function designator" :
6045 type->kind == TYPE_BITFIELD ? "bitfield" :
6047 if (wrong_type != NULL) {
6048 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6051 tp_expression->typeprop.type = expression->base.type;
6052 tp_expression->typeprop.tp_expression = expression;
6055 return tp_expression;
6057 return create_invalid_expression();
6060 static expression_t *parse_sizeof(unsigned precedence)
6062 source_position_t pos = *HERE;
6064 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
6067 static expression_t *parse_alignof(unsigned precedence)
6069 source_position_t pos = *HERE;
6071 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
6074 static expression_t *parse_select_expression(unsigned precedence,
6075 expression_t *compound)
6078 assert(token.type == '.' || token.type == T_MINUSGREATER);
6080 bool is_pointer = (token.type == T_MINUSGREATER);
6083 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6084 select->select.compound = compound;
6086 if (token.type != T_IDENTIFIER) {
6087 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6090 symbol_t *symbol = token.v.symbol;
6091 select->select.symbol = symbol;
6094 type_t *const orig_type = compound->base.type;
6095 type_t *const type = skip_typeref(orig_type);
6097 type_t *type_left = type;
6099 if (!is_type_pointer(type)) {
6100 if (is_type_valid(type)) {
6101 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
6103 return create_invalid_expression();
6105 type_left = type->pointer.points_to;
6107 type_left = skip_typeref(type_left);
6109 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
6110 type_left->kind != TYPE_COMPOUND_UNION) {
6111 if (is_type_valid(type_left)) {
6112 errorf(HERE, "request for member '%Y' in something not a struct or "
6113 "union, but '%T'", symbol, type_left);
6115 return create_invalid_expression();
6118 declaration_t *const declaration = type_left->compound.declaration;
6120 if (!declaration->init.complete) {
6121 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
6123 return create_invalid_expression();
6126 declaration_t *iter = find_compound_entry(declaration, symbol);
6128 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
6129 return create_invalid_expression();
6132 /* we always do the auto-type conversions; the & and sizeof parser contains
6133 * code to revert this! */
6134 type_t *expression_type = automatic_type_conversion(iter->type);
6136 select->select.compound_entry = iter;
6137 select->base.type = expression_type;
6139 type_t *skipped = skip_typeref(iter->type);
6140 if (skipped->kind == TYPE_BITFIELD) {
6141 select->base.type = skipped->bitfield.base_type;
6147 static void check_call_argument(const function_parameter_t *parameter,
6148 call_argument_t *argument)
6150 type_t *expected_type = parameter->type;
6151 type_t *expected_type_skip = skip_typeref(expected_type);
6152 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
6153 expression_t *arg_expr = argument->expression;
6155 /* handle transparent union gnu extension */
6156 if (is_type_union(expected_type_skip)
6157 && (expected_type_skip->base.modifiers
6158 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
6159 declaration_t *union_decl = expected_type_skip->compound.declaration;
6161 declaration_t *declaration = union_decl->scope.declarations;
6162 type_t *best_type = NULL;
6163 for ( ; declaration != NULL; declaration = declaration->next) {
6164 type_t *decl_type = declaration->type;
6165 error = semantic_assign(decl_type, arg_expr);
6166 if (error == ASSIGN_ERROR_INCOMPATIBLE
6167 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
6170 if (error == ASSIGN_SUCCESS) {
6171 best_type = decl_type;
6172 } else if (best_type == NULL) {
6173 best_type = decl_type;
6177 if (best_type != NULL) {
6178 expected_type = best_type;
6182 error = semantic_assign(expected_type, arg_expr);
6183 argument->expression = create_implicit_cast(argument->expression,
6186 /* TODO report exact scope in error messages (like "in 3rd parameter") */
6187 report_assign_error(error, expected_type, arg_expr, "function call",
6188 &arg_expr->base.source_position);
6192 * Parse a call expression, ie. expression '( ... )'.
6194 * @param expression the function address
6196 static expression_t *parse_call_expression(unsigned precedence,
6197 expression_t *expression)
6200 expression_t *result = allocate_expression_zero(EXPR_CALL);
6201 result->base.source_position = expression->base.source_position;
6203 call_expression_t *call = &result->call;
6204 call->function = expression;
6206 type_t *const orig_type = expression->base.type;
6207 type_t *const type = skip_typeref(orig_type);
6209 function_type_t *function_type = NULL;
6210 if (is_type_pointer(type)) {
6211 type_t *const to_type = skip_typeref(type->pointer.points_to);
6213 if (is_type_function(to_type)) {
6214 function_type = &to_type->function;
6215 call->base.type = function_type->return_type;
6219 if (function_type == NULL && is_type_valid(type)) {
6220 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
6223 /* parse arguments */
6225 add_anchor_token(')');
6226 add_anchor_token(',');
6228 if (token.type != ')') {
6229 call_argument_t *last_argument = NULL;
6232 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
6234 argument->expression = parse_assignment_expression();
6235 if (last_argument == NULL) {
6236 call->arguments = argument;
6238 last_argument->next = argument;
6240 last_argument = argument;
6242 if (token.type != ',')
6247 rem_anchor_token(',');
6248 rem_anchor_token(')');
6251 if (function_type == NULL)
6254 function_parameter_t *parameter = function_type->parameters;
6255 call_argument_t *argument = call->arguments;
6256 if (!function_type->unspecified_parameters) {
6257 for( ; parameter != NULL && argument != NULL;
6258 parameter = parameter->next, argument = argument->next) {
6259 check_call_argument(parameter, argument);
6262 if (parameter != NULL) {
6263 errorf(HERE, "too few arguments to function '%E'", expression);
6264 } else if (argument != NULL && !function_type->variadic) {
6265 errorf(HERE, "too many arguments to function '%E'", expression);
6269 /* do default promotion */
6270 for( ; argument != NULL; argument = argument->next) {
6271 type_t *type = argument->expression->base.type;
6273 type = get_default_promoted_type(type);
6275 argument->expression
6276 = create_implicit_cast(argument->expression, type);
6279 check_format(&result->call);
6283 return create_invalid_expression();
6286 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
6288 static bool same_compound_type(const type_t *type1, const type_t *type2)
6291 is_type_compound(type1) &&
6292 type1->kind == type2->kind &&
6293 type1->compound.declaration == type2->compound.declaration;
6297 * Parse a conditional expression, ie. 'expression ? ... : ...'.
6299 * @param expression the conditional expression
6301 static expression_t *parse_conditional_expression(unsigned precedence,
6302 expression_t *expression)
6305 add_anchor_token(':');
6307 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
6309 conditional_expression_t *conditional = &result->conditional;
6310 conditional->condition = expression;
6313 type_t *const condition_type_orig = expression->base.type;
6314 type_t *const condition_type = skip_typeref(condition_type_orig);
6315 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
6316 type_error("expected a scalar type in conditional condition",
6317 &expression->base.source_position, condition_type_orig);
6320 expression_t *true_expression = parse_expression();
6321 rem_anchor_token(':');
6323 expression_t *false_expression = parse_sub_expression(precedence);
6325 type_t *const orig_true_type = true_expression->base.type;
6326 type_t *const orig_false_type = false_expression->base.type;
6327 type_t *const true_type = skip_typeref(orig_true_type);
6328 type_t *const false_type = skip_typeref(orig_false_type);
6331 type_t *result_type;
6332 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
6333 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6334 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
6335 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6336 warningf(&expression->base.source_position,
6337 "ISO C forbids conditional expression with only one void side");
6339 result_type = type_void;
6340 } else if (is_type_arithmetic(true_type)
6341 && is_type_arithmetic(false_type)) {
6342 result_type = semantic_arithmetic(true_type, false_type);
6344 true_expression = create_implicit_cast(true_expression, result_type);
6345 false_expression = create_implicit_cast(false_expression, result_type);
6347 conditional->true_expression = true_expression;
6348 conditional->false_expression = false_expression;
6349 conditional->base.type = result_type;
6350 } else if (same_compound_type(true_type, false_type)) {
6351 /* just take 1 of the 2 types */
6352 result_type = true_type;
6353 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
6354 type_t *pointer_type;
6356 expression_t *other_expression;
6357 if (is_type_pointer(true_type) &&
6358 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
6359 pointer_type = true_type;
6360 other_type = false_type;
6361 other_expression = false_expression;
6363 pointer_type = false_type;
6364 other_type = true_type;
6365 other_expression = true_expression;
6368 if (is_null_pointer_constant(other_expression)) {
6369 result_type = pointer_type;
6370 } else if (is_type_pointer(other_type)) {
6371 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
6372 type_t *to2 = skip_typeref(other_type->pointer.points_to);
6375 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
6376 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
6378 } else if (types_compatible(get_unqualified_type(to1),
6379 get_unqualified_type(to2))) {
6382 warningf(&expression->base.source_position,
6383 "pointer types '%T' and '%T' in conditional expression are incompatible",
6384 true_type, false_type);
6388 type_t *const copy = duplicate_type(to);
6389 copy->base.qualifiers = to1->base.qualifiers | to2->base.qualifiers;
6391 type_t *const type = typehash_insert(copy);
6395 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
6396 } else if (is_type_integer(other_type)) {
6397 warningf(&expression->base.source_position,
6398 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
6399 result_type = pointer_type;
6401 type_error_incompatible("while parsing conditional",
6402 &expression->base.source_position, true_type, false_type);
6403 result_type = type_error_type;
6406 /* TODO: one pointer to void*, other some pointer */
6408 if (is_type_valid(true_type) && is_type_valid(false_type)) {
6409 type_error_incompatible("while parsing conditional",
6410 &expression->base.source_position, true_type,
6413 result_type = type_error_type;
6416 conditional->true_expression
6417 = create_implicit_cast(true_expression, result_type);
6418 conditional->false_expression
6419 = create_implicit_cast(false_expression, result_type);
6420 conditional->base.type = result_type;
6423 return create_invalid_expression();
6427 * Parse an extension expression.
6429 static expression_t *parse_extension(unsigned precedence)
6431 eat(T___extension__);
6433 /* TODO enable extensions */
6434 expression_t *expression = parse_sub_expression(precedence);
6435 /* TODO disable extensions */
6440 * Parse a __builtin_classify_type() expression.
6442 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6444 eat(T___builtin_classify_type);
6446 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6447 result->base.type = type_int;
6450 add_anchor_token(')');
6451 expression_t *expression = parse_sub_expression(precedence);
6452 rem_anchor_token(')');
6454 result->classify_type.type_expression = expression;
6458 return create_invalid_expression();
6461 static void check_pointer_arithmetic(const source_position_t *source_position,
6462 type_t *pointer_type,
6463 type_t *orig_pointer_type)
6465 type_t *points_to = pointer_type->pointer.points_to;
6466 points_to = skip_typeref(points_to);
6468 if (is_type_incomplete(points_to) &&
6470 || !is_type_atomic(points_to, ATOMIC_TYPE_VOID))) {
6471 errorf(source_position,
6472 "arithmetic with pointer to incomplete type '%T' not allowed",
6474 } else if (is_type_function(points_to)) {
6475 errorf(source_position,
6476 "arithmetic with pointer to function type '%T' not allowed",
6481 static void semantic_incdec(unary_expression_t *expression)
6483 type_t *const orig_type = expression->value->base.type;
6484 type_t *const type = skip_typeref(orig_type);
6485 if (is_type_pointer(type)) {
6486 check_pointer_arithmetic(&expression->base.source_position,
6488 } else if (!is_type_real(type) && is_type_valid(type)) {
6489 /* TODO: improve error message */
6490 errorf(HERE, "operation needs an arithmetic or pointer type");
6492 expression->base.type = orig_type;
6495 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6497 type_t *const orig_type = expression->value->base.type;
6498 type_t *const type = skip_typeref(orig_type);
6499 if (!is_type_arithmetic(type)) {
6500 if (is_type_valid(type)) {
6501 /* TODO: improve error message */
6502 errorf(HERE, "operation needs an arithmetic type");
6507 expression->base.type = orig_type;
6510 static void semantic_unexpr_scalar(unary_expression_t *expression)
6512 type_t *const orig_type = expression->value->base.type;
6513 type_t *const type = skip_typeref(orig_type);
6514 if (!is_type_scalar(type)) {
6515 if (is_type_valid(type)) {
6516 errorf(HERE, "operand of ! must be of scalar type");
6521 expression->base.type = orig_type;
6524 static void semantic_unexpr_integer(unary_expression_t *expression)
6526 type_t *const orig_type = expression->value->base.type;
6527 type_t *const type = skip_typeref(orig_type);
6528 if (!is_type_integer(type)) {
6529 if (is_type_valid(type)) {
6530 errorf(HERE, "operand of ~ must be of integer type");
6535 expression->base.type = orig_type;
6538 static void semantic_dereference(unary_expression_t *expression)
6540 type_t *const orig_type = expression->value->base.type;
6541 type_t *const type = skip_typeref(orig_type);
6542 if (!is_type_pointer(type)) {
6543 if (is_type_valid(type)) {
6544 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6549 type_t *result_type = type->pointer.points_to;
6550 result_type = automatic_type_conversion(result_type);
6551 expression->base.type = result_type;
6554 static void set_address_taken(expression_t *expression, bool may_be_register)
6556 if (expression->kind != EXPR_REFERENCE)
6559 declaration_t *const declaration = expression->reference.declaration;
6560 /* happens for parse errors */
6561 if (declaration == NULL)
6564 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
6565 errorf(&expression->base.source_position,
6566 "address of register variable '%Y' requested",
6567 declaration->symbol);
6569 declaration->address_taken = 1;
6574 * Check the semantic of the address taken expression.
6576 static void semantic_take_addr(unary_expression_t *expression)
6578 expression_t *value = expression->value;
6579 value->base.type = revert_automatic_type_conversion(value);
6581 type_t *orig_type = value->base.type;
6582 if (!is_type_valid(orig_type))
6585 set_address_taken(value, false);
6587 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6590 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6591 static expression_t *parse_##unexpression_type(unsigned precedence) \
6595 expression_t *unary_expression \
6596 = allocate_expression_zero(unexpression_type); \
6597 unary_expression->base.source_position = *HERE; \
6598 unary_expression->unary.value = parse_sub_expression(precedence); \
6600 sfunc(&unary_expression->unary); \
6602 return unary_expression; \
6605 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6606 semantic_unexpr_arithmetic)
6607 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6608 semantic_unexpr_arithmetic)
6609 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6610 semantic_unexpr_scalar)
6611 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6612 semantic_dereference)
6613 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6615 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6616 semantic_unexpr_integer)
6617 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6619 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6622 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6624 static expression_t *parse_##unexpression_type(unsigned precedence, \
6625 expression_t *left) \
6627 (void) precedence; \
6630 expression_t *unary_expression \
6631 = allocate_expression_zero(unexpression_type); \
6632 unary_expression->unary.value = left; \
6634 sfunc(&unary_expression->unary); \
6636 return unary_expression; \
6639 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6640 EXPR_UNARY_POSTFIX_INCREMENT,
6642 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6643 EXPR_UNARY_POSTFIX_DECREMENT,
6646 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6648 /* TODO: handle complex + imaginary types */
6650 /* § 6.3.1.8 Usual arithmetic conversions */
6651 if (type_left == type_long_double || type_right == type_long_double) {
6652 return type_long_double;
6653 } else if (type_left == type_double || type_right == type_double) {
6655 } else if (type_left == type_float || type_right == type_float) {
6659 type_left = promote_integer(type_left);
6660 type_right = promote_integer(type_right);
6662 if (type_left == type_right)
6665 bool const signed_left = is_type_signed(type_left);
6666 bool const signed_right = is_type_signed(type_right);
6667 int const rank_left = get_rank(type_left);
6668 int const rank_right = get_rank(type_right);
6670 if (signed_left == signed_right)
6671 return rank_left >= rank_right ? type_left : type_right;
6680 u_rank = rank_right;
6681 u_type = type_right;
6683 s_rank = rank_right;
6684 s_type = type_right;
6689 if (u_rank >= s_rank)
6692 if (get_atomic_type_size(s_rank) > get_atomic_type_size(u_rank))
6696 type_t *const type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
6698 case ATOMIC_TYPE_INT: type->atomic.akind = ATOMIC_TYPE_UINT; break;
6699 case ATOMIC_TYPE_LONG: type->atomic.akind = ATOMIC_TYPE_ULONG; break;
6700 case ATOMIC_TYPE_LONGLONG: type->atomic.akind = ATOMIC_TYPE_ULONGLONG; break;
6702 default: panic("invalid atomic type");
6705 type_t* const result = typehash_insert(type);
6713 * Check the semantic restrictions for a binary expression.
6715 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6717 expression_t *const left = expression->left;
6718 expression_t *const right = expression->right;
6719 type_t *const orig_type_left = left->base.type;
6720 type_t *const orig_type_right = right->base.type;
6721 type_t *const type_left = skip_typeref(orig_type_left);
6722 type_t *const type_right = skip_typeref(orig_type_right);
6724 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6725 /* TODO: improve error message */
6726 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6727 errorf(HERE, "operation needs arithmetic types");
6732 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6733 expression->left = create_implicit_cast(left, arithmetic_type);
6734 expression->right = create_implicit_cast(right, arithmetic_type);
6735 expression->base.type = arithmetic_type;
6738 static void semantic_shift_op(binary_expression_t *expression)
6740 expression_t *const left = expression->left;
6741 expression_t *const right = expression->right;
6742 type_t *const orig_type_left = left->base.type;
6743 type_t *const orig_type_right = right->base.type;
6744 type_t * type_left = skip_typeref(orig_type_left);
6745 type_t * type_right = skip_typeref(orig_type_right);
6747 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
6748 /* TODO: improve error message */
6749 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6750 errorf(HERE, "operation needs integer types");
6755 type_left = promote_integer(type_left);
6756 type_right = promote_integer(type_right);
6758 expression->left = create_implicit_cast(left, type_left);
6759 expression->right = create_implicit_cast(right, type_right);
6760 expression->base.type = type_left;
6763 static void semantic_add(binary_expression_t *expression)
6765 expression_t *const left = expression->left;
6766 expression_t *const right = expression->right;
6767 type_t *const orig_type_left = left->base.type;
6768 type_t *const orig_type_right = right->base.type;
6769 type_t *const type_left = skip_typeref(orig_type_left);
6770 type_t *const type_right = skip_typeref(orig_type_right);
6773 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6774 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6775 expression->left = create_implicit_cast(left, arithmetic_type);
6776 expression->right = create_implicit_cast(right, arithmetic_type);
6777 expression->base.type = arithmetic_type;
6779 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6780 check_pointer_arithmetic(&expression->base.source_position,
6781 type_left, orig_type_left);
6782 expression->base.type = type_left;
6783 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
6784 check_pointer_arithmetic(&expression->base.source_position,
6785 type_right, orig_type_right);
6786 expression->base.type = type_right;
6787 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6788 errorf(&expression->base.source_position,
6789 "invalid operands to binary + ('%T', '%T')",
6790 orig_type_left, orig_type_right);
6794 static void semantic_sub(binary_expression_t *expression)
6796 expression_t *const left = expression->left;
6797 expression_t *const right = expression->right;
6798 type_t *const orig_type_left = left->base.type;
6799 type_t *const orig_type_right = right->base.type;
6800 type_t *const type_left = skip_typeref(orig_type_left);
6801 type_t *const type_right = skip_typeref(orig_type_right);
6804 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6805 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6806 expression->left = create_implicit_cast(left, arithmetic_type);
6807 expression->right = create_implicit_cast(right, arithmetic_type);
6808 expression->base.type = arithmetic_type;
6810 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6811 check_pointer_arithmetic(&expression->base.source_position,
6812 type_left, orig_type_left);
6813 expression->base.type = type_left;
6814 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6815 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
6816 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
6817 if (!types_compatible(unqual_left, unqual_right)) {
6818 errorf(&expression->base.source_position,
6819 "subtracting pointers to incompatible types '%T' and '%T'",
6820 orig_type_left, orig_type_right);
6821 } else if (!is_type_object(unqual_left)) {
6822 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
6823 warningf(&expression->base.source_position,
6824 "subtracting pointers to void");
6826 errorf(&expression->base.source_position,
6827 "subtracting pointers to non-object types '%T'",
6831 expression->base.type = type_ptrdiff_t;
6832 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6833 errorf(HERE, "invalid operands of types '%T' and '%T' to binary '-'",
6834 orig_type_left, orig_type_right);
6839 * Check the semantics of comparison expressions.
6841 * @param expression The expression to check.
6843 static void semantic_comparison(binary_expression_t *expression)
6845 expression_t *left = expression->left;
6846 expression_t *right = expression->right;
6847 type_t *orig_type_left = left->base.type;
6848 type_t *orig_type_right = right->base.type;
6850 type_t *type_left = skip_typeref(orig_type_left);
6851 type_t *type_right = skip_typeref(orig_type_right);
6853 /* TODO non-arithmetic types */
6854 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6855 /* test for signed vs unsigned compares */
6856 if (warning.sign_compare &&
6857 (expression->base.kind != EXPR_BINARY_EQUAL &&
6858 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6859 (is_type_signed(type_left) != is_type_signed(type_right))) {
6861 /* check if 1 of the operands is a constant, in this case we just
6862 * check wether we can safely represent the resulting constant in
6863 * the type of the other operand. */
6864 expression_t *const_expr = NULL;
6865 expression_t *other_expr = NULL;
6867 if (is_constant_expression(left)) {
6870 } else if (is_constant_expression(right)) {
6875 if (const_expr != NULL) {
6876 type_t *other_type = skip_typeref(other_expr->base.type);
6877 long val = fold_constant(const_expr);
6878 /* TODO: check if val can be represented by other_type */
6882 warningf(&expression->base.source_position,
6883 "comparison between signed and unsigned");
6885 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6886 expression->left = create_implicit_cast(left, arithmetic_type);
6887 expression->right = create_implicit_cast(right, arithmetic_type);
6888 expression->base.type = arithmetic_type;
6889 if (warning.float_equal &&
6890 (expression->base.kind == EXPR_BINARY_EQUAL ||
6891 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6892 is_type_float(arithmetic_type)) {
6893 warningf(&expression->base.source_position,
6894 "comparing floating point with == or != is unsafe");
6896 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6897 /* TODO check compatibility */
6898 } else if (is_type_pointer(type_left)) {
6899 expression->right = create_implicit_cast(right, type_left);
6900 } else if (is_type_pointer(type_right)) {
6901 expression->left = create_implicit_cast(left, type_right);
6902 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6903 type_error_incompatible("invalid operands in comparison",
6904 &expression->base.source_position,
6905 type_left, type_right);
6907 expression->base.type = type_int;
6911 * Checks if a compound type has constant fields.
6913 static bool has_const_fields(const compound_type_t *type)
6915 const scope_t *scope = &type->declaration->scope;
6916 const declaration_t *declaration = scope->declarations;
6918 for (; declaration != NULL; declaration = declaration->next) {
6919 if (declaration->namespc != NAMESPACE_NORMAL)
6922 const type_t *decl_type = skip_typeref(declaration->type);
6923 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6930 static bool is_lvalue(const expression_t *expression)
6932 switch (expression->kind) {
6933 case EXPR_REFERENCE:
6934 case EXPR_ARRAY_ACCESS:
6936 case EXPR_UNARY_DEREFERENCE:
6944 static bool is_valid_assignment_lhs(expression_t const* const left)
6946 type_t *const orig_type_left = revert_automatic_type_conversion(left);
6947 type_t *const type_left = skip_typeref(orig_type_left);
6949 if (!is_lvalue(left)) {
6950 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
6955 if (is_type_array(type_left)) {
6956 errorf(HERE, "cannot assign to arrays ('%E')", left);
6959 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6960 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6964 if (is_type_incomplete(type_left)) {
6965 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
6966 left, orig_type_left);
6969 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6970 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6971 left, orig_type_left);
6978 static void semantic_arithmetic_assign(binary_expression_t *expression)
6980 expression_t *left = expression->left;
6981 expression_t *right = expression->right;
6982 type_t *orig_type_left = left->base.type;
6983 type_t *orig_type_right = right->base.type;
6985 if (!is_valid_assignment_lhs(left))
6988 type_t *type_left = skip_typeref(orig_type_left);
6989 type_t *type_right = skip_typeref(orig_type_right);
6991 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6992 /* TODO: improve error message */
6993 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6994 errorf(HERE, "operation needs arithmetic types");
6999 /* combined instructions are tricky. We can't create an implicit cast on
7000 * the left side, because we need the uncasted form for the store.
7001 * The ast2firm pass has to know that left_type must be right_type
7002 * for the arithmetic operation and create a cast by itself */
7003 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7004 expression->right = create_implicit_cast(right, arithmetic_type);
7005 expression->base.type = type_left;
7008 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
7010 expression_t *const left = expression->left;
7011 expression_t *const right = expression->right;
7012 type_t *const orig_type_left = left->base.type;
7013 type_t *const orig_type_right = right->base.type;
7014 type_t *const type_left = skip_typeref(orig_type_left);
7015 type_t *const type_right = skip_typeref(orig_type_right);
7017 if (!is_valid_assignment_lhs(left))
7020 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7021 /* combined instructions are tricky. We can't create an implicit cast on
7022 * the left side, because we need the uncasted form for the store.
7023 * The ast2firm pass has to know that left_type must be right_type
7024 * for the arithmetic operation and create a cast by itself */
7025 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
7026 expression->right = create_implicit_cast(right, arithmetic_type);
7027 expression->base.type = type_left;
7028 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7029 check_pointer_arithmetic(&expression->base.source_position,
7030 type_left, orig_type_left);
7031 expression->base.type = type_left;
7032 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7033 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
7038 * Check the semantic restrictions of a logical expression.
7040 static void semantic_logical_op(binary_expression_t *expression)
7042 expression_t *const left = expression->left;
7043 expression_t *const right = expression->right;
7044 type_t *const orig_type_left = left->base.type;
7045 type_t *const orig_type_right = right->base.type;
7046 type_t *const type_left = skip_typeref(orig_type_left);
7047 type_t *const type_right = skip_typeref(orig_type_right);
7049 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
7050 /* TODO: improve error message */
7051 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7052 errorf(HERE, "operation needs scalar types");
7057 expression->base.type = type_int;
7061 * Check the semantic restrictions of a binary assign expression.
7063 static void semantic_binexpr_assign(binary_expression_t *expression)
7065 expression_t *left = expression->left;
7066 type_t *orig_type_left = left->base.type;
7068 type_t *type_left = revert_automatic_type_conversion(left);
7069 type_left = skip_typeref(orig_type_left);
7071 if (!is_valid_assignment_lhs(left))
7074 assign_error_t error = semantic_assign(orig_type_left, expression->right);
7075 report_assign_error(error, orig_type_left, expression->right,
7076 "assignment", &left->base.source_position);
7077 expression->right = create_implicit_cast(expression->right, orig_type_left);
7078 expression->base.type = orig_type_left;
7082 * Determine if the outermost operation (or parts thereof) of the given
7083 * expression has no effect in order to generate a warning about this fact.
7084 * Therefore in some cases this only examines some of the operands of the
7085 * expression (see comments in the function and examples below).
7087 * f() + 23; // warning, because + has no effect
7088 * x || f(); // no warning, because x controls execution of f()
7089 * x ? y : f(); // warning, because y has no effect
7090 * (void)x; // no warning to be able to suppress the warning
7091 * This function can NOT be used for an "expression has definitely no effect"-
7093 static bool expression_has_effect(const expression_t *const expr)
7095 switch (expr->kind) {
7096 case EXPR_UNKNOWN: break;
7097 case EXPR_INVALID: return true; /* do NOT warn */
7098 case EXPR_REFERENCE: return false;
7099 /* suppress the warning for microsoft __noop operations */
7100 case EXPR_CONST: return expr->conste.is_ms_noop;
7101 case EXPR_CHARACTER_CONSTANT: return false;
7102 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
7103 case EXPR_STRING_LITERAL: return false;
7104 case EXPR_WIDE_STRING_LITERAL: return false;
7107 const call_expression_t *const call = &expr->call;
7108 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
7111 switch (call->function->builtin_symbol.symbol->ID) {
7112 case T___builtin_va_end: return true;
7113 default: return false;
7117 /* Generate the warning if either the left or right hand side of a
7118 * conditional expression has no effect */
7119 case EXPR_CONDITIONAL: {
7120 const conditional_expression_t *const cond = &expr->conditional;
7122 expression_has_effect(cond->true_expression) &&
7123 expression_has_effect(cond->false_expression);
7126 case EXPR_SELECT: return false;
7127 case EXPR_ARRAY_ACCESS: return false;
7128 case EXPR_SIZEOF: return false;
7129 case EXPR_CLASSIFY_TYPE: return false;
7130 case EXPR_ALIGNOF: return false;
7132 case EXPR_FUNCNAME: return false;
7133 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
7134 case EXPR_BUILTIN_CONSTANT_P: return false;
7135 case EXPR_BUILTIN_PREFETCH: return true;
7136 case EXPR_OFFSETOF: return false;
7137 case EXPR_VA_START: return true;
7138 case EXPR_VA_ARG: return true;
7139 case EXPR_STATEMENT: return true; // TODO
7140 case EXPR_COMPOUND_LITERAL: return false;
7142 case EXPR_UNARY_NEGATE: return false;
7143 case EXPR_UNARY_PLUS: return false;
7144 case EXPR_UNARY_BITWISE_NEGATE: return false;
7145 case EXPR_UNARY_NOT: return false;
7146 case EXPR_UNARY_DEREFERENCE: return false;
7147 case EXPR_UNARY_TAKE_ADDRESS: return false;
7148 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
7149 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
7150 case EXPR_UNARY_PREFIX_INCREMENT: return true;
7151 case EXPR_UNARY_PREFIX_DECREMENT: return true;
7153 /* Treat void casts as if they have an effect in order to being able to
7154 * suppress the warning */
7155 case EXPR_UNARY_CAST: {
7156 type_t *const type = skip_typeref(expr->base.type);
7157 return is_type_atomic(type, ATOMIC_TYPE_VOID);
7160 case EXPR_UNARY_CAST_IMPLICIT: return true;
7161 case EXPR_UNARY_ASSUME: return true;
7163 case EXPR_BINARY_ADD: return false;
7164 case EXPR_BINARY_SUB: return false;
7165 case EXPR_BINARY_MUL: return false;
7166 case EXPR_BINARY_DIV: return false;
7167 case EXPR_BINARY_MOD: return false;
7168 case EXPR_BINARY_EQUAL: return false;
7169 case EXPR_BINARY_NOTEQUAL: return false;
7170 case EXPR_BINARY_LESS: return false;
7171 case EXPR_BINARY_LESSEQUAL: return false;
7172 case EXPR_BINARY_GREATER: return false;
7173 case EXPR_BINARY_GREATEREQUAL: return false;
7174 case EXPR_BINARY_BITWISE_AND: return false;
7175 case EXPR_BINARY_BITWISE_OR: return false;
7176 case EXPR_BINARY_BITWISE_XOR: return false;
7177 case EXPR_BINARY_SHIFTLEFT: return false;
7178 case EXPR_BINARY_SHIFTRIGHT: return false;
7179 case EXPR_BINARY_ASSIGN: return true;
7180 case EXPR_BINARY_MUL_ASSIGN: return true;
7181 case EXPR_BINARY_DIV_ASSIGN: return true;
7182 case EXPR_BINARY_MOD_ASSIGN: return true;
7183 case EXPR_BINARY_ADD_ASSIGN: return true;
7184 case EXPR_BINARY_SUB_ASSIGN: return true;
7185 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
7186 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
7187 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
7188 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
7189 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
7191 /* Only examine the right hand side of && and ||, because the left hand
7192 * side already has the effect of controlling the execution of the right
7194 case EXPR_BINARY_LOGICAL_AND:
7195 case EXPR_BINARY_LOGICAL_OR:
7196 /* Only examine the right hand side of a comma expression, because the left
7197 * hand side has a separate warning */
7198 case EXPR_BINARY_COMMA:
7199 return expression_has_effect(expr->binary.right);
7201 case EXPR_BINARY_BUILTIN_EXPECT: return true;
7202 case EXPR_BINARY_ISGREATER: return false;
7203 case EXPR_BINARY_ISGREATEREQUAL: return false;
7204 case EXPR_BINARY_ISLESS: return false;
7205 case EXPR_BINARY_ISLESSEQUAL: return false;
7206 case EXPR_BINARY_ISLESSGREATER: return false;
7207 case EXPR_BINARY_ISUNORDERED: return false;
7210 internal_errorf(HERE, "unexpected expression");
7213 static void semantic_comma(binary_expression_t *expression)
7215 if (warning.unused_value) {
7216 const expression_t *const left = expression->left;
7217 if (!expression_has_effect(left)) {
7218 warningf(&left->base.source_position,
7219 "left-hand operand of comma expression has no effect");
7222 expression->base.type = expression->right->base.type;
7225 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
7226 static expression_t *parse_##binexpression_type(unsigned precedence, \
7227 expression_t *left) \
7230 source_position_t pos = *HERE; \
7232 expression_t *right = parse_sub_expression(precedence + lr); \
7234 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
7235 binexpr->base.source_position = pos; \
7236 binexpr->binary.left = left; \
7237 binexpr->binary.right = right; \
7238 sfunc(&binexpr->binary); \
7243 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
7244 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
7245 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
7246 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
7247 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
7248 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
7249 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
7250 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
7251 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
7253 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
7254 semantic_comparison, 1)
7255 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
7256 semantic_comparison, 1)
7257 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
7258 semantic_comparison, 1)
7259 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
7260 semantic_comparison, 1)
7262 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
7263 semantic_binexpr_arithmetic, 1)
7264 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
7265 semantic_binexpr_arithmetic, 1)
7266 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
7267 semantic_binexpr_arithmetic, 1)
7268 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
7269 semantic_logical_op, 1)
7270 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
7271 semantic_logical_op, 1)
7272 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
7273 semantic_shift_op, 1)
7274 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
7275 semantic_shift_op, 1)
7276 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
7277 semantic_arithmetic_addsubb_assign, 0)
7278 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
7279 semantic_arithmetic_addsubb_assign, 0)
7280 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
7281 semantic_arithmetic_assign, 0)
7282 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
7283 semantic_arithmetic_assign, 0)
7284 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
7285 semantic_arithmetic_assign, 0)
7286 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
7287 semantic_arithmetic_assign, 0)
7288 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7289 semantic_arithmetic_assign, 0)
7290 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
7291 semantic_arithmetic_assign, 0)
7292 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
7293 semantic_arithmetic_assign, 0)
7294 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
7295 semantic_arithmetic_assign, 0)
7297 static expression_t *parse_sub_expression(unsigned precedence)
7299 if (token.type < 0) {
7300 return expected_expression_error();
7303 expression_parser_function_t *parser
7304 = &expression_parsers[token.type];
7305 source_position_t source_position = token.source_position;
7308 if (parser->parser != NULL) {
7309 left = parser->parser(parser->precedence);
7311 left = parse_primary_expression();
7313 assert(left != NULL);
7314 left->base.source_position = source_position;
7317 if (token.type < 0) {
7318 return expected_expression_error();
7321 parser = &expression_parsers[token.type];
7322 if (parser->infix_parser == NULL)
7324 if (parser->infix_precedence < precedence)
7327 left = parser->infix_parser(parser->infix_precedence, left);
7329 assert(left != NULL);
7330 assert(left->kind != EXPR_UNKNOWN);
7331 left->base.source_position = source_position;
7338 * Parse an expression.
7340 static expression_t *parse_expression(void)
7342 return parse_sub_expression(1);
7346 * Register a parser for a prefix-like operator with given precedence.
7348 * @param parser the parser function
7349 * @param token_type the token type of the prefix token
7350 * @param precedence the precedence of the operator
7352 static void register_expression_parser(parse_expression_function parser,
7353 int token_type, unsigned precedence)
7355 expression_parser_function_t *entry = &expression_parsers[token_type];
7357 if (entry->parser != NULL) {
7358 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7359 panic("trying to register multiple expression parsers for a token");
7361 entry->parser = parser;
7362 entry->precedence = precedence;
7366 * Register a parser for an infix operator with given precedence.
7368 * @param parser the parser function
7369 * @param token_type the token type of the infix operator
7370 * @param precedence the precedence of the operator
7372 static void register_infix_parser(parse_expression_infix_function parser,
7373 int token_type, unsigned precedence)
7375 expression_parser_function_t *entry = &expression_parsers[token_type];
7377 if (entry->infix_parser != NULL) {
7378 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7379 panic("trying to register multiple infix expression parsers for a "
7382 entry->infix_parser = parser;
7383 entry->infix_precedence = precedence;
7387 * Initialize the expression parsers.
7389 static void init_expression_parsers(void)
7391 memset(&expression_parsers, 0, sizeof(expression_parsers));
7393 register_infix_parser(parse_array_expression, '[', 30);
7394 register_infix_parser(parse_call_expression, '(', 30);
7395 register_infix_parser(parse_select_expression, '.', 30);
7396 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
7397 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
7399 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
7402 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
7403 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
7404 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
7405 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
7406 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
7407 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
7408 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
7409 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
7410 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
7411 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
7412 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
7413 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
7414 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
7415 T_EXCLAMATIONMARKEQUAL, 13);
7416 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
7417 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
7418 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
7419 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
7420 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
7421 register_infix_parser(parse_conditional_expression, '?', 7);
7422 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
7423 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
7424 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
7425 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
7426 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
7427 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
7428 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
7429 T_LESSLESSEQUAL, 2);
7430 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7431 T_GREATERGREATEREQUAL, 2);
7432 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
7434 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
7436 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
7439 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
7441 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
7442 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
7443 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
7444 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
7445 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
7446 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
7447 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
7449 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
7451 register_expression_parser(parse_sizeof, T_sizeof, 25);
7452 register_expression_parser(parse_alignof, T___alignof__, 25);
7453 register_expression_parser(parse_extension, T___extension__, 25);
7454 register_expression_parser(parse_builtin_classify_type,
7455 T___builtin_classify_type, 25);
7459 * Parse a asm statement arguments specification.
7461 static asm_argument_t *parse_asm_arguments(bool is_out)
7463 asm_argument_t *result = NULL;
7464 asm_argument_t *last = NULL;
7466 while (token.type == T_STRING_LITERAL || token.type == '[') {
7467 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7468 memset(argument, 0, sizeof(argument[0]));
7470 if (token.type == '[') {
7472 if (token.type != T_IDENTIFIER) {
7473 parse_error_expected("while parsing asm argument",
7474 T_IDENTIFIER, NULL);
7477 argument->symbol = token.v.symbol;
7482 argument->constraints = parse_string_literals();
7484 add_anchor_token(')');
7485 expression_t *expression = parse_expression();
7486 rem_anchor_token(')');
7488 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
7489 * change size or type representation (e.g. int -> long is ok, but
7490 * int -> float is not) */
7491 if (expression->kind == EXPR_UNARY_CAST) {
7492 type_t *const type = expression->base.type;
7493 type_kind_t const kind = type->kind;
7494 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
7497 if (kind == TYPE_ATOMIC) {
7498 atomic_type_kind_t const akind = type->atomic.akind;
7499 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
7500 size = get_atomic_type_size(akind);
7502 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
7503 size = get_atomic_type_size(get_intptr_kind());
7507 expression_t *const value = expression->unary.value;
7508 type_t *const value_type = value->base.type;
7509 type_kind_t const value_kind = value_type->kind;
7511 unsigned value_flags;
7512 unsigned value_size;
7513 if (value_kind == TYPE_ATOMIC) {
7514 atomic_type_kind_t const value_akind = value_type->atomic.akind;
7515 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
7516 value_size = get_atomic_type_size(value_akind);
7517 } else if (value_kind == TYPE_POINTER) {
7518 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
7519 value_size = get_atomic_type_size(get_intptr_kind());
7524 if (value_flags != flags || value_size != size)
7528 } while (expression->kind == EXPR_UNARY_CAST);
7532 if (!is_lvalue(expression)) {
7533 errorf(&expression->base.source_position,
7534 "asm output argument is not an lvalue");
7537 argument->expression = expression;
7540 set_address_taken(expression, true);
7543 last->next = argument;
7549 if (token.type != ',')
7560 * Parse a asm statement clobber specification.
7562 static asm_clobber_t *parse_asm_clobbers(void)
7564 asm_clobber_t *result = NULL;
7565 asm_clobber_t *last = NULL;
7567 while(token.type == T_STRING_LITERAL) {
7568 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
7569 clobber->clobber = parse_string_literals();
7572 last->next = clobber;
7578 if (token.type != ',')
7587 * Parse an asm statement.
7589 static statement_t *parse_asm_statement(void)
7593 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7594 statement->base.source_position = token.source_position;
7596 asm_statement_t *asm_statement = &statement->asms;
7598 if (token.type == T_volatile) {
7600 asm_statement->is_volatile = true;
7604 add_anchor_token(')');
7605 add_anchor_token(':');
7606 asm_statement->asm_text = parse_string_literals();
7608 if (token.type != ':') {
7609 rem_anchor_token(':');
7614 asm_statement->outputs = parse_asm_arguments(true);
7615 if (token.type != ':') {
7616 rem_anchor_token(':');
7621 asm_statement->inputs = parse_asm_arguments(false);
7622 if (token.type != ':') {
7623 rem_anchor_token(':');
7626 rem_anchor_token(':');
7629 asm_statement->clobbers = parse_asm_clobbers();
7632 rem_anchor_token(')');
7636 if (asm_statement->outputs == NULL) {
7637 /* GCC: An 'asm' instruction without any output operands will be treated
7638 * identically to a volatile 'asm' instruction. */
7639 asm_statement->is_volatile = true;
7644 return create_invalid_statement();
7648 * Parse a case statement.
7650 static statement_t *parse_case_statement(void)
7654 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7656 statement->base.source_position = token.source_position;
7657 statement->case_label.expression = parse_expression();
7659 if (c_mode & _GNUC) {
7660 if (token.type == T_DOTDOTDOT) {
7662 statement->case_label.end_range = parse_expression();
7668 if (! is_constant_expression(statement->case_label.expression)) {
7669 errorf(&statement->base.source_position,
7670 "case label does not reduce to an integer constant");
7672 /* TODO: check if the case label is already known */
7673 if (current_switch != NULL) {
7674 /* link all cases into the switch statement */
7675 if (current_switch->last_case == NULL) {
7676 current_switch->first_case =
7677 current_switch->last_case = &statement->case_label;
7679 current_switch->last_case->next = &statement->case_label;
7682 errorf(&statement->base.source_position,
7683 "case label not within a switch statement");
7686 statement->case_label.statement = parse_statement();
7690 return create_invalid_statement();
7694 * Finds an existing default label of a switch statement.
7696 static case_label_statement_t *
7697 find_default_label(const switch_statement_t *statement)
7699 case_label_statement_t *label = statement->first_case;
7700 for ( ; label != NULL; label = label->next) {
7701 if (label->expression == NULL)
7708 * Parse a default statement.
7710 static statement_t *parse_default_statement(void)
7714 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7716 statement->base.source_position = token.source_position;
7719 if (current_switch != NULL) {
7720 const case_label_statement_t *def_label = find_default_label(current_switch);
7721 if (def_label != NULL) {
7722 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7723 &def_label->base.source_position);
7725 /* link all cases into the switch statement */
7726 if (current_switch->last_case == NULL) {
7727 current_switch->first_case =
7728 current_switch->last_case = &statement->case_label;
7730 current_switch->last_case->next = &statement->case_label;
7734 errorf(&statement->base.source_position,
7735 "'default' label not within a switch statement");
7737 statement->case_label.statement = parse_statement();
7741 return create_invalid_statement();
7745 * Return the declaration for a given label symbol or create a new one.
7747 * @param symbol the symbol of the label
7749 static declaration_t *get_label(symbol_t *symbol)
7751 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7752 assert(current_function != NULL);
7753 /* if we found a label in the same function, then we already created the
7755 if (candidate != NULL
7756 && candidate->parent_scope == ¤t_function->scope) {
7760 /* otherwise we need to create a new one */
7761 declaration_t *const declaration = allocate_declaration_zero();
7762 declaration->namespc = NAMESPACE_LABEL;
7763 declaration->symbol = symbol;
7765 label_push(declaration);
7771 * Parse a label statement.
7773 static statement_t *parse_label_statement(void)
7775 assert(token.type == T_IDENTIFIER);
7776 symbol_t *symbol = token.v.symbol;
7779 declaration_t *label = get_label(symbol);
7781 /* if source position is already set then the label is defined twice,
7782 * otherwise it was just mentioned in a goto so far */
7783 if (label->source_position.input_name != NULL) {
7784 errorf(HERE, "duplicate label '%Y' (declared %P)",
7785 symbol, &label->source_position);
7787 label->source_position = token.source_position;
7790 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7792 statement->base.source_position = token.source_position;
7793 statement->label.label = label;
7797 if (token.type == '}') {
7798 /* TODO only warn? */
7800 warningf(HERE, "label at end of compound statement");
7801 statement->label.statement = create_empty_statement();
7803 errorf(HERE, "label at end of compound statement");
7804 statement->label.statement = create_invalid_statement();
7806 } else if (token.type == ';') {
7807 /* Eat an empty statement here, to avoid the warning about an empty
7808 * statement after a label. label:; is commonly used to have a label
7809 * before a closing brace. */
7810 statement->label.statement = create_empty_statement();
7813 statement->label.statement = parse_statement();
7816 /* remember the labels in a list for later checking */
7817 if (label_last == NULL) {
7818 label_first = &statement->label;
7820 label_last->next = &statement->label;
7822 label_last = &statement->label;
7828 * Parse an if statement.
7830 static statement_t *parse_if(void)
7834 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7835 statement->base.source_position = token.source_position;
7838 add_anchor_token(')');
7839 statement->ifs.condition = parse_expression();
7840 rem_anchor_token(')');
7843 add_anchor_token(T_else);
7844 statement->ifs.true_statement = parse_statement();
7845 rem_anchor_token(T_else);
7847 if (token.type == T_else) {
7849 statement->ifs.false_statement = parse_statement();
7854 return create_invalid_statement();
7858 * Parse a switch statement.
7860 static statement_t *parse_switch(void)
7864 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7865 statement->base.source_position = token.source_position;
7868 expression_t *const expr = parse_expression();
7869 type_t * type = skip_typeref(expr->base.type);
7870 if (is_type_integer(type)) {
7871 type = promote_integer(type);
7872 } else if (is_type_valid(type)) {
7873 errorf(&expr->base.source_position,
7874 "switch quantity is not an integer, but '%T'", type);
7875 type = type_error_type;
7877 statement->switchs.expression = create_implicit_cast(expr, type);
7880 switch_statement_t *rem = current_switch;
7881 current_switch = &statement->switchs;
7882 statement->switchs.body = parse_statement();
7883 current_switch = rem;
7885 if (warning.switch_default &&
7886 find_default_label(&statement->switchs) == NULL) {
7887 warningf(&statement->base.source_position, "switch has no default case");
7892 return create_invalid_statement();
7895 static statement_t *parse_loop_body(statement_t *const loop)
7897 statement_t *const rem = current_loop;
7898 current_loop = loop;
7900 statement_t *const body = parse_statement();
7907 * Parse a while statement.
7909 static statement_t *parse_while(void)
7913 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7914 statement->base.source_position = token.source_position;
7917 add_anchor_token(')');
7918 statement->whiles.condition = parse_expression();
7919 rem_anchor_token(')');
7922 statement->whiles.body = parse_loop_body(statement);
7926 return create_invalid_statement();
7930 * Parse a do statement.
7932 static statement_t *parse_do(void)
7936 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7938 statement->base.source_position = token.source_position;
7940 add_anchor_token(T_while);
7941 statement->do_while.body = parse_loop_body(statement);
7942 rem_anchor_token(T_while);
7946 add_anchor_token(')');
7947 statement->do_while.condition = parse_expression();
7948 rem_anchor_token(')');
7954 return create_invalid_statement();
7958 * Parse a for statement.
7960 static statement_t *parse_for(void)
7964 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7965 statement->base.source_position = token.source_position;
7967 int top = environment_top();
7968 scope_t *last_scope = scope;
7969 set_scope(&statement->fors.scope);
7972 add_anchor_token(')');
7974 if (token.type != ';') {
7975 if (is_declaration_specifier(&token, false)) {
7976 parse_declaration(record_declaration);
7978 add_anchor_token(';');
7979 expression_t *const init = parse_expression();
7980 statement->fors.initialisation = init;
7981 if (warning.unused_value && !expression_has_effect(init)) {
7982 warningf(&init->base.source_position,
7983 "initialisation of 'for'-statement has no effect");
7985 rem_anchor_token(';');
7992 if (token.type != ';') {
7993 add_anchor_token(';');
7994 statement->fors.condition = parse_expression();
7995 rem_anchor_token(';');
7998 if (token.type != ')') {
7999 expression_t *const step = parse_expression();
8000 statement->fors.step = step;
8001 if (warning.unused_value && !expression_has_effect(step)) {
8002 warningf(&step->base.source_position,
8003 "step of 'for'-statement has no effect");
8006 rem_anchor_token(')');
8008 statement->fors.body = parse_loop_body(statement);
8010 assert(scope == &statement->fors.scope);
8011 set_scope(last_scope);
8012 environment_pop_to(top);
8017 rem_anchor_token(')');
8018 assert(scope == &statement->fors.scope);
8019 set_scope(last_scope);
8020 environment_pop_to(top);
8022 return create_invalid_statement();
8026 * Parse a goto statement.
8028 static statement_t *parse_goto(void)
8032 if (token.type != T_IDENTIFIER) {
8033 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
8037 symbol_t *symbol = token.v.symbol;
8040 declaration_t *label = get_label(symbol);
8042 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
8043 statement->base.source_position = token.source_position;
8045 statement->gotos.label = label;
8047 /* remember the goto's in a list for later checking */
8048 if (goto_last == NULL) {
8049 goto_first = &statement->gotos;
8051 goto_last->next = &statement->gotos;
8053 goto_last = &statement->gotos;
8059 return create_invalid_statement();
8063 * Parse a continue statement.
8065 static statement_t *parse_continue(void)
8067 statement_t *statement;
8068 if (current_loop == NULL) {
8069 errorf(HERE, "continue statement not within loop");
8070 statement = create_invalid_statement();
8072 statement = allocate_statement_zero(STATEMENT_CONTINUE);
8074 statement->base.source_position = token.source_position;
8082 return create_invalid_statement();
8086 * Parse a break statement.
8088 static statement_t *parse_break(void)
8090 statement_t *statement;
8091 if (current_switch == NULL && current_loop == NULL) {
8092 errorf(HERE, "break statement not within loop or switch");
8093 statement = create_invalid_statement();
8095 statement = allocate_statement_zero(STATEMENT_BREAK);
8097 statement->base.source_position = token.source_position;
8105 return create_invalid_statement();
8109 * Parse a __leave statement.
8111 static statement_t *parse_leave(void)
8113 statement_t *statement;
8114 if (current_try == NULL) {
8115 errorf(HERE, "__leave statement not within __try");
8116 statement = create_invalid_statement();
8118 statement = allocate_statement_zero(STATEMENT_LEAVE);
8120 statement->base.source_position = token.source_position;
8128 return create_invalid_statement();
8132 * Check if a given declaration represents a local variable.
8134 static bool is_local_var_declaration(const declaration_t *declaration)
8136 switch ((storage_class_tag_t) declaration->storage_class) {
8137 case STORAGE_CLASS_AUTO:
8138 case STORAGE_CLASS_REGISTER: {
8139 const type_t *type = skip_typeref(declaration->type);
8140 if (is_type_function(type)) {
8152 * Check if a given declaration represents a variable.
8154 static bool is_var_declaration(const declaration_t *declaration)
8156 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
8159 const type_t *type = skip_typeref(declaration->type);
8160 return !is_type_function(type);
8164 * Check if a given expression represents a local variable.
8166 static bool is_local_variable(const expression_t *expression)
8168 if (expression->base.kind != EXPR_REFERENCE) {
8171 const declaration_t *declaration = expression->reference.declaration;
8172 return is_local_var_declaration(declaration);
8176 * Check if a given expression represents a local variable and
8177 * return its declaration then, else return NULL.
8179 declaration_t *expr_is_variable(const expression_t *expression)
8181 if (expression->base.kind != EXPR_REFERENCE) {
8184 declaration_t *declaration = expression->reference.declaration;
8185 if (is_var_declaration(declaration))
8191 * Parse a return statement.
8193 static statement_t *parse_return(void)
8195 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
8196 statement->base.source_position = token.source_position;
8200 expression_t *return_value = NULL;
8201 if (token.type != ';') {
8202 return_value = parse_expression();
8206 const type_t *const func_type = current_function->type;
8207 assert(is_type_function(func_type));
8208 type_t *const return_type = skip_typeref(func_type->function.return_type);
8210 if (return_value != NULL) {
8211 type_t *return_value_type = skip_typeref(return_value->base.type);
8213 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
8214 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
8215 warningf(&statement->base.source_position,
8216 "'return' with a value, in function returning void");
8217 return_value = NULL;
8219 assign_error_t error = semantic_assign(return_type, return_value);
8220 report_assign_error(error, return_type, return_value, "'return'",
8221 &statement->base.source_position);
8222 return_value = create_implicit_cast(return_value, return_type);
8224 /* check for returning address of a local var */
8225 if (return_value != NULL &&
8226 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
8227 const expression_t *expression = return_value->unary.value;
8228 if (is_local_variable(expression)) {
8229 warningf(&statement->base.source_position,
8230 "function returns address of local variable");
8234 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
8235 warningf(&statement->base.source_position,
8236 "'return' without value, in function returning non-void");
8239 statement->returns.value = return_value;
8243 return create_invalid_statement();
8247 * Parse a declaration statement.
8249 static statement_t *parse_declaration_statement(void)
8251 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
8253 statement->base.source_position = token.source_position;
8255 declaration_t *before = last_declaration;
8256 parse_declaration(record_declaration);
8258 if (before == NULL) {
8259 statement->declaration.declarations_begin = scope->declarations;
8261 statement->declaration.declarations_begin = before->next;
8263 statement->declaration.declarations_end = last_declaration;
8269 * Parse an expression statement, ie. expr ';'.
8271 static statement_t *parse_expression_statement(void)
8273 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
8275 statement->base.source_position = token.source_position;
8276 expression_t *const expr = parse_expression();
8277 statement->expression.expression = expr;
8283 return create_invalid_statement();
8287 * Parse a microsoft __try { } __finally { } or
8288 * __try{ } __except() { }
8290 static statement_t *parse_ms_try_statment(void)
8292 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
8294 statement->base.source_position = token.source_position;
8297 ms_try_statement_t *rem = current_try;
8298 current_try = &statement->ms_try;
8299 statement->ms_try.try_statement = parse_compound_statement(false);
8302 if (token.type == T___except) {
8305 add_anchor_token(')');
8306 expression_t *const expr = parse_expression();
8307 type_t * type = skip_typeref(expr->base.type);
8308 if (is_type_integer(type)) {
8309 type = promote_integer(type);
8310 } else if (is_type_valid(type)) {
8311 errorf(&expr->base.source_position,
8312 "__expect expression is not an integer, but '%T'", type);
8313 type = type_error_type;
8315 statement->ms_try.except_expression = create_implicit_cast(expr, type);
8316 rem_anchor_token(')');
8318 statement->ms_try.final_statement = parse_compound_statement(false);
8319 } else if (token.type == T__finally) {
8321 statement->ms_try.final_statement = parse_compound_statement(false);
8323 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
8324 return create_invalid_statement();
8328 return create_invalid_statement();
8331 static statement_t *parse_empty_statement(void)
8333 if (warning.empty_statement) {
8334 warningf(HERE, "statement is empty");
8337 return create_empty_statement();
8341 * Parse a statement.
8342 * There's also parse_statement() which additionally checks for
8343 * "statement has no effect" warnings
8345 static statement_t *intern_parse_statement(void)
8347 statement_t *statement = NULL;
8349 /* declaration or statement */
8350 add_anchor_token(';');
8351 switch (token.type) {
8353 if (look_ahead(1)->type == ':') {
8354 statement = parse_label_statement();
8355 } else if (is_typedef_symbol(token.v.symbol)) {
8356 statement = parse_declaration_statement();
8358 statement = parse_expression_statement();
8362 case T___extension__:
8363 /* This can be a prefix to a declaration or an expression statement.
8364 * We simply eat it now and parse the rest with tail recursion. */
8367 } while (token.type == T___extension__);
8368 statement = parse_statement();
8372 statement = parse_declaration_statement();
8375 case ';': statement = parse_empty_statement(); break;
8376 case '{': statement = parse_compound_statement(false); break;
8377 case T___leave: statement = parse_leave(); break;
8378 case T___try: statement = parse_ms_try_statment(); break;
8379 case T_asm: statement = parse_asm_statement(); break;
8380 case T_break: statement = parse_break(); break;
8381 case T_case: statement = parse_case_statement(); break;
8382 case T_continue: statement = parse_continue(); break;
8383 case T_default: statement = parse_default_statement(); break;
8384 case T_do: statement = parse_do(); break;
8385 case T_for: statement = parse_for(); break;
8386 case T_goto: statement = parse_goto(); break;
8387 case T_if: statement = parse_if (); break;
8388 case T_return: statement = parse_return(); break;
8389 case T_switch: statement = parse_switch(); break;
8390 case T_while: statement = parse_while(); break;
8391 default: statement = parse_expression_statement(); break;
8393 rem_anchor_token(';');
8395 assert(statement != NULL
8396 && statement->base.source_position.input_name != NULL);
8402 * parse a statement and emits "statement has no effect" warning if needed
8403 * (This is really a wrapper around intern_parse_statement with check for 1
8404 * single warning. It is needed, because for statement expressions we have
8405 * to avoid the warning on the last statement)
8407 static statement_t *parse_statement(void)
8409 statement_t *statement = intern_parse_statement();
8411 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
8412 expression_t *expression = statement->expression.expression;
8413 if (!expression_has_effect(expression)) {
8414 warningf(&expression->base.source_position,
8415 "statement has no effect");
8423 * Parse a compound statement.
8425 static statement_t *parse_compound_statement(bool inside_expression_statement)
8427 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
8429 statement->base.source_position = token.source_position;
8432 add_anchor_token('}');
8434 int top = environment_top();
8435 scope_t *last_scope = scope;
8436 set_scope(&statement->compound.scope);
8438 statement_t *last_statement = NULL;
8440 while (token.type != '}' && token.type != T_EOF) {
8441 statement_t *sub_statement = intern_parse_statement();
8442 if (is_invalid_statement(sub_statement)) {
8443 /* an error occurred. if we are at an anchor, return */
8449 if (last_statement != NULL) {
8450 last_statement->base.next = sub_statement;
8452 statement->compound.statements = sub_statement;
8455 while (sub_statement->base.next != NULL)
8456 sub_statement = sub_statement->base.next;
8458 last_statement = sub_statement;
8461 if (token.type == '}') {
8464 errorf(&statement->base.source_position,
8465 "end of file while looking for closing '}'");
8468 /* look over all statements again to produce no effect warnings */
8469 if (warning.unused_value) {
8470 statement_t *sub_statement = statement->compound.statements;
8471 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
8472 if (sub_statement->kind != STATEMENT_EXPRESSION)
8474 /* don't emit a warning for the last expression in an expression
8475 * statement as it has always an effect */
8476 if (inside_expression_statement && sub_statement->base.next == NULL)
8479 expression_t *expression = sub_statement->expression.expression;
8480 if (!expression_has_effect(expression)) {
8481 warningf(&expression->base.source_position,
8482 "statement has no effect");
8488 rem_anchor_token('}');
8489 assert(scope == &statement->compound.scope);
8490 set_scope(last_scope);
8491 environment_pop_to(top);
8497 * Initialize builtin types.
8499 static void initialize_builtin_types(void)
8501 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
8502 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
8503 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
8504 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
8505 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
8506 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
8507 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
8508 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
8510 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
8511 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
8512 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
8513 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
8517 * Check for unused global static functions and variables
8519 static void check_unused_globals(void)
8521 if (!warning.unused_function && !warning.unused_variable)
8524 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
8526 decl->modifiers & DM_UNUSED ||
8527 decl->modifiers & DM_USED ||
8528 decl->storage_class != STORAGE_CLASS_STATIC)
8531 type_t *const type = decl->type;
8533 if (is_type_function(skip_typeref(type))) {
8534 if (!warning.unused_function || decl->is_inline)
8537 s = (decl->init.statement != NULL ? "defined" : "declared");
8539 if (!warning.unused_variable)
8545 warningf(&decl->source_position, "'%#T' %s but not used",
8546 type, decl->symbol, s);
8550 static void parse_global_asm(void)
8555 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8556 statement->base.source_position = token.source_position;
8557 statement->asms.asm_text = parse_string_literals();
8558 statement->base.next = unit->global_asm;
8559 unit->global_asm = statement;
8568 * Parse a translation unit.
8570 static void parse_translation_unit(void)
8572 for (;;) switch (token.type) {
8575 case T___extension__:
8576 parse_external_declaration();
8587 /* TODO error in strict mode */
8588 warningf(HERE, "stray ';' outside of function");
8593 errorf(HERE, "stray %K outside of function", &token);
8594 if (token.type == '(' || token.type == '{' || token.type == '[')
8595 eat_until_matching_token(token.type);
8604 * @return the translation unit or NULL if errors occurred.
8606 void start_parsing(void)
8608 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8609 label_stack = NEW_ARR_F(stack_entry_t, 0);
8610 diagnostic_count = 0;
8614 type_set_output(stderr);
8615 ast_set_output(stderr);
8617 assert(unit == NULL);
8618 unit = allocate_ast_zero(sizeof(unit[0]));
8620 assert(global_scope == NULL);
8621 global_scope = &unit->scope;
8623 assert(scope == NULL);
8624 set_scope(&unit->scope);
8626 initialize_builtin_types();
8629 translation_unit_t *finish_parsing(void)
8631 assert(scope == &unit->scope);
8633 last_declaration = NULL;
8635 assert(global_scope == &unit->scope);
8636 check_unused_globals();
8637 global_scope = NULL;
8639 DEL_ARR_F(environment_stack);
8640 DEL_ARR_F(label_stack);
8642 translation_unit_t *result = unit;
8649 lookahead_bufpos = 0;
8650 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8653 parse_translation_unit();
8657 * Initialize the parser.
8659 void init_parser(void)
8662 /* add predefined symbols for extended-decl-modifier */
8663 sym_align = symbol_table_insert("align");
8664 sym_allocate = symbol_table_insert("allocate");
8665 sym_dllimport = symbol_table_insert("dllimport");
8666 sym_dllexport = symbol_table_insert("dllexport");
8667 sym_naked = symbol_table_insert("naked");
8668 sym_noinline = symbol_table_insert("noinline");
8669 sym_noreturn = symbol_table_insert("noreturn");
8670 sym_nothrow = symbol_table_insert("nothrow");
8671 sym_novtable = symbol_table_insert("novtable");
8672 sym_property = symbol_table_insert("property");
8673 sym_get = symbol_table_insert("get");
8674 sym_put = symbol_table_insert("put");
8675 sym_selectany = symbol_table_insert("selectany");
8676 sym_thread = symbol_table_insert("thread");
8677 sym_uuid = symbol_table_insert("uuid");
8678 sym_deprecated = symbol_table_insert("deprecated");
8679 sym_restrict = symbol_table_insert("restrict");
8680 sym_noalias = symbol_table_insert("noalias");
8682 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8684 init_expression_parsers();
8685 obstack_init(&temp_obst);
8687 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8688 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8692 * Terminate the parser.
8694 void exit_parser(void)
8696 obstack_free(&temp_obst, NULL);