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();
2342 goto finish_designator;
2343 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2344 /* GNU-style designator ("identifier: value") */
2345 designator = allocate_ast_zero(sizeof(designator[0]));
2346 designator->source_position = token.source_position;
2347 designator->symbol = token.v.symbol;
2352 /* reset path to toplevel, evaluate designator from there */
2353 ascend_to(path, top_path_level);
2354 if (!walk_designator(path, designator, false)) {
2355 /* can't continue after designation error */
2359 initializer_t *designator_initializer
2360 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2361 designator_initializer->designator.designator = designator;
2362 ARR_APP1(initializer_t*, initializers, designator_initializer);
2364 orig_type = path->top_type;
2365 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2370 if (token.type == '{') {
2371 if (type != NULL && is_type_scalar(type)) {
2372 sub = parse_scalar_initializer(type, env->must_be_constant);
2376 if (env->declaration != NULL) {
2377 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2378 env->declaration->symbol);
2380 errorf(HERE, "extra brace group at end of initializer");
2383 descend_into_subtype(path);
2385 add_anchor_token('}');
2386 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2388 rem_anchor_token('}');
2391 ascend_from_subtype(path);
2395 goto error_parse_next;
2399 /* must be an expression */
2400 expression_t *expression = parse_assignment_expression();
2402 if (env->must_be_constant && !is_initializer_constant(expression)) {
2403 errorf(&expression->base.source_position,
2404 "Initialisation expression '%E' is not constant\n",
2409 /* we are already outside, ... */
2413 /* handle { "string" } special case */
2414 if ((expression->kind == EXPR_STRING_LITERAL
2415 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2416 && outer_type != NULL) {
2417 sub = initializer_from_expression(outer_type, expression);
2419 if (token.type == ',') {
2422 if (token.type != '}') {
2423 warningf(HERE, "excessive elements in initializer for type '%T'",
2426 /* TODO: eat , ... */
2431 /* descend into subtypes until expression matches type */
2433 orig_type = path->top_type;
2434 type = skip_typeref(orig_type);
2436 sub = initializer_from_expression(orig_type, expression);
2440 if (!is_type_valid(type)) {
2443 if (is_type_scalar(type)) {
2444 errorf(&expression->base.source_position,
2445 "expression '%E' doesn't match expected type '%T'",
2446 expression, orig_type);
2450 descend_into_subtype(path);
2454 /* update largest index of top array */
2455 const type_path_entry_t *first = &path->path[0];
2456 type_t *first_type = first->type;
2457 first_type = skip_typeref(first_type);
2458 if (is_type_array(first_type)) {
2459 size_t index = first->v.index;
2460 if (index > path->max_index)
2461 path->max_index = index;
2465 /* append to initializers list */
2466 ARR_APP1(initializer_t*, initializers, sub);
2469 if (env->declaration != NULL)
2470 warningf(HERE, "excess elements in struct initializer for '%Y'",
2471 env->declaration->symbol);
2473 warningf(HERE, "excess elements in struct initializer");
2477 if (token.type == '}') {
2481 if (token.type == '}') {
2486 /* advance to the next declaration if we are not at the end */
2487 advance_current_object(path, top_path_level);
2488 orig_type = path->top_type;
2489 if (orig_type != NULL)
2490 type = skip_typeref(orig_type);
2496 size_t len = ARR_LEN(initializers);
2497 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2498 initializer_t *result = allocate_ast_zero(size);
2499 result->kind = INITIALIZER_LIST;
2500 result->list.len = len;
2501 memcpy(&result->list.initializers, initializers,
2502 len * sizeof(initializers[0]));
2504 DEL_ARR_F(initializers);
2505 ascend_to(path, top_path_level+1);
2510 skip_initializers();
2511 DEL_ARR_F(initializers);
2512 ascend_to(path, top_path_level+1);
2517 * Parses an initializer. Parsers either a compound literal
2518 * (env->declaration == NULL) or an initializer of a declaration.
2520 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2522 type_t *type = skip_typeref(env->type);
2523 initializer_t *result = NULL;
2526 if (is_type_scalar(type)) {
2527 result = parse_scalar_initializer(type, env->must_be_constant);
2528 } else if (token.type == '{') {
2532 memset(&path, 0, sizeof(path));
2533 path.top_type = env->type;
2534 path.path = NEW_ARR_F(type_path_entry_t, 0);
2536 descend_into_subtype(&path);
2538 add_anchor_token('}');
2539 result = parse_sub_initializer(&path, env->type, 1, env);
2540 rem_anchor_token('}');
2542 max_index = path.max_index;
2543 DEL_ARR_F(path.path);
2547 /* parse_scalar_initializer() also works in this case: we simply
2548 * have an expression without {} around it */
2549 result = parse_scalar_initializer(type, env->must_be_constant);
2552 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2553 * the array type size */
2554 if (is_type_array(type) && type->array.size_expression == NULL
2555 && result != NULL) {
2557 switch (result->kind) {
2558 case INITIALIZER_LIST:
2559 size = max_index + 1;
2562 case INITIALIZER_STRING:
2563 size = result->string.string.size;
2566 case INITIALIZER_WIDE_STRING:
2567 size = result->wide_string.string.size;
2570 case INITIALIZER_DESIGNATOR:
2571 case INITIALIZER_VALUE:
2572 /* can happen for parse errors */
2577 internal_errorf(HERE, "invalid initializer type");
2580 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2581 cnst->base.type = type_size_t;
2582 cnst->conste.v.int_value = size;
2584 type_t *new_type = duplicate_type(type);
2586 new_type->array.size_expression = cnst;
2587 new_type->array.size_constant = true;
2588 new_type->array.size = size;
2589 env->type = new_type;
2597 static declaration_t *append_declaration(declaration_t *declaration);
2599 static declaration_t *parse_compound_type_specifier(bool is_struct)
2601 gnu_attribute_t *attributes = NULL;
2602 decl_modifiers_t modifiers = 0;
2609 symbol_t *symbol = NULL;
2610 declaration_t *declaration = NULL;
2612 if (token.type == T___attribute__) {
2613 modifiers |= parse_attributes(&attributes);
2616 if (token.type == T_IDENTIFIER) {
2617 symbol = token.v.symbol;
2620 namespace_t const namespc =
2621 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2622 declaration = get_declaration(symbol, namespc);
2623 if (declaration != NULL) {
2624 if (declaration->parent_scope != scope &&
2625 (token.type == '{' || token.type == ';')) {
2627 } else if (declaration->init.complete &&
2628 token.type == '{') {
2629 assert(symbol != NULL);
2630 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2631 is_struct ? "struct" : "union", symbol,
2632 &declaration->source_position);
2633 declaration->scope.declarations = NULL;
2636 } else if (token.type != '{') {
2638 parse_error_expected("while parsing struct type specifier",
2639 T_IDENTIFIER, '{', NULL);
2641 parse_error_expected("while parsing union type specifier",
2642 T_IDENTIFIER, '{', NULL);
2648 if (declaration == NULL) {
2649 declaration = allocate_declaration_zero();
2650 declaration->namespc =
2651 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2652 declaration->source_position = token.source_position;
2653 declaration->symbol = symbol;
2654 declaration->parent_scope = scope;
2655 if (symbol != NULL) {
2656 environment_push(declaration);
2658 append_declaration(declaration);
2661 if (token.type == '{') {
2662 declaration->init.complete = true;
2664 parse_compound_type_entries(declaration);
2665 modifiers |= parse_attributes(&attributes);
2668 declaration->modifiers |= modifiers;
2672 static void parse_enum_entries(type_t *const enum_type)
2676 if (token.type == '}') {
2678 errorf(HERE, "empty enum not allowed");
2682 add_anchor_token('}');
2684 if (token.type != T_IDENTIFIER) {
2685 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2687 rem_anchor_token('}');
2691 declaration_t *const entry = allocate_declaration_zero();
2692 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2693 entry->type = enum_type;
2694 entry->symbol = token.v.symbol;
2695 entry->source_position = token.source_position;
2698 if (token.type == '=') {
2700 expression_t *value = parse_constant_expression();
2702 value = create_implicit_cast(value, enum_type);
2703 entry->init.enum_value = value;
2708 record_declaration(entry);
2710 if (token.type != ',')
2713 } while (token.type != '}');
2714 rem_anchor_token('}');
2722 static type_t *parse_enum_specifier(void)
2724 gnu_attribute_t *attributes = NULL;
2725 declaration_t *declaration;
2729 if (token.type == T_IDENTIFIER) {
2730 symbol = token.v.symbol;
2733 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2734 } else if (token.type != '{') {
2735 parse_error_expected("while parsing enum type specifier",
2736 T_IDENTIFIER, '{', NULL);
2743 if (declaration == NULL) {
2744 declaration = allocate_declaration_zero();
2745 declaration->namespc = NAMESPACE_ENUM;
2746 declaration->source_position = token.source_position;
2747 declaration->symbol = symbol;
2748 declaration->parent_scope = scope;
2751 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2752 type->enumt.declaration = declaration;
2754 if (token.type == '{') {
2755 if (declaration->init.complete) {
2756 errorf(HERE, "multiple definitions of enum %Y", symbol);
2758 if (symbol != NULL) {
2759 environment_push(declaration);
2761 append_declaration(declaration);
2762 declaration->init.complete = true;
2764 parse_enum_entries(type);
2765 parse_attributes(&attributes);
2772 * if a symbol is a typedef to another type, return true
2774 static bool is_typedef_symbol(symbol_t *symbol)
2776 const declaration_t *const declaration =
2777 get_declaration(symbol, NAMESPACE_NORMAL);
2779 declaration != NULL &&
2780 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2783 static type_t *parse_typeof(void)
2790 add_anchor_token(')');
2792 expression_t *expression = NULL;
2795 switch(token.type) {
2796 case T___extension__:
2797 /* This can be a prefix to a typename or an expression. We simply eat
2801 } while (token.type == T___extension__);
2805 if (is_typedef_symbol(token.v.symbol)) {
2806 type = parse_typename();
2808 expression = parse_expression();
2809 type = expression->base.type;
2814 type = parse_typename();
2818 expression = parse_expression();
2819 type = expression->base.type;
2823 rem_anchor_token(')');
2826 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2827 typeof_type->typeoft.expression = expression;
2828 typeof_type->typeoft.typeof_type = type;
2835 typedef enum specifiers_t {
2836 SPECIFIER_SIGNED = 1 << 0,
2837 SPECIFIER_UNSIGNED = 1 << 1,
2838 SPECIFIER_LONG = 1 << 2,
2839 SPECIFIER_INT = 1 << 3,
2840 SPECIFIER_DOUBLE = 1 << 4,
2841 SPECIFIER_CHAR = 1 << 5,
2842 SPECIFIER_SHORT = 1 << 6,
2843 SPECIFIER_LONG_LONG = 1 << 7,
2844 SPECIFIER_FLOAT = 1 << 8,
2845 SPECIFIER_BOOL = 1 << 9,
2846 SPECIFIER_VOID = 1 << 10,
2847 SPECIFIER_INT8 = 1 << 11,
2848 SPECIFIER_INT16 = 1 << 12,
2849 SPECIFIER_INT32 = 1 << 13,
2850 SPECIFIER_INT64 = 1 << 14,
2851 SPECIFIER_INT128 = 1 << 15,
2852 SPECIFIER_COMPLEX = 1 << 16,
2853 SPECIFIER_IMAGINARY = 1 << 17,
2856 static type_t *create_builtin_type(symbol_t *const symbol,
2857 type_t *const real_type)
2859 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2860 type->builtin.symbol = symbol;
2861 type->builtin.real_type = real_type;
2863 type_t *result = typehash_insert(type);
2864 if (type != result) {
2871 static type_t *get_typedef_type(symbol_t *symbol)
2873 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2874 if (declaration == NULL ||
2875 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2878 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2879 type->typedeft.declaration = declaration;
2885 * check for the allowed MS alignment values.
2887 static bool check_alignment_value(long long intvalue)
2889 if (intvalue < 1 || intvalue > 8192) {
2890 errorf(HERE, "illegal alignment value");
2893 unsigned v = (unsigned)intvalue;
2894 for(unsigned i = 1; i <= 8192; i += i) {
2898 errorf(HERE, "alignment must be power of two");
2902 #define DET_MOD(name, tag) do { \
2903 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2904 *modifiers |= tag; \
2907 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2909 decl_modifiers_t *modifiers = &specifiers->modifiers;
2912 if (token.type == T_restrict) {
2914 DET_MOD(restrict, DM_RESTRICT);
2916 } else if (token.type != T_IDENTIFIER)
2918 symbol_t *symbol = token.v.symbol;
2919 if (symbol == sym_align) {
2922 if (token.type != T_INTEGER)
2924 if (check_alignment_value(token.v.intvalue)) {
2925 if (specifiers->alignment != 0)
2926 warningf(HERE, "align used more than once");
2927 specifiers->alignment = (unsigned char)token.v.intvalue;
2931 } else if (symbol == sym_allocate) {
2934 if (token.type != T_IDENTIFIER)
2936 (void)token.v.symbol;
2938 } else if (symbol == sym_dllimport) {
2940 DET_MOD(dllimport, DM_DLLIMPORT);
2941 } else if (symbol == sym_dllexport) {
2943 DET_MOD(dllexport, DM_DLLEXPORT);
2944 } else if (symbol == sym_thread) {
2946 DET_MOD(thread, DM_THREAD);
2947 } else if (symbol == sym_naked) {
2949 DET_MOD(naked, DM_NAKED);
2950 } else if (symbol == sym_noinline) {
2952 DET_MOD(noinline, DM_NOINLINE);
2953 } else if (symbol == sym_noreturn) {
2955 DET_MOD(noreturn, DM_NORETURN);
2956 } else if (symbol == sym_nothrow) {
2958 DET_MOD(nothrow, DM_NOTHROW);
2959 } else if (symbol == sym_novtable) {
2961 DET_MOD(novtable, DM_NOVTABLE);
2962 } else if (symbol == sym_property) {
2966 bool is_get = false;
2967 if (token.type != T_IDENTIFIER)
2969 if (token.v.symbol == sym_get) {
2971 } else if (token.v.symbol == sym_put) {
2973 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2978 if (token.type != T_IDENTIFIER)
2981 if (specifiers->get_property_sym != NULL) {
2982 errorf(HERE, "get property name already specified");
2984 specifiers->get_property_sym = token.v.symbol;
2987 if (specifiers->put_property_sym != NULL) {
2988 errorf(HERE, "put property name already specified");
2990 specifiers->put_property_sym = token.v.symbol;
2994 if (token.type == ',') {
3001 } else if (symbol == sym_selectany) {
3003 DET_MOD(selectany, DM_SELECTANY);
3004 } else if (symbol == sym_uuid) {
3007 if (token.type != T_STRING_LITERAL)
3011 } else if (symbol == sym_deprecated) {
3013 if (specifiers->deprecated != 0)
3014 warningf(HERE, "deprecated used more than once");
3015 specifiers->deprecated = 1;
3016 if (token.type == '(') {
3018 if (token.type == T_STRING_LITERAL) {
3019 specifiers->deprecated_string = token.v.string.begin;
3022 errorf(HERE, "string literal expected");
3026 } else if (symbol == sym_noalias) {
3028 DET_MOD(noalias, DM_NOALIAS);
3030 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3032 if (token.type == '(')
3036 if (token.type == ',')
3043 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3045 type_t *type = NULL;
3046 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3047 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3048 unsigned type_specifiers = 0;
3051 specifiers->source_position = token.source_position;
3054 specifiers->modifiers
3055 |= parse_attributes(&specifiers->gnu_attributes);
3056 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3057 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3059 switch(token.type) {
3062 #define MATCH_STORAGE_CLASS(token, class) \
3064 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3065 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3067 specifiers->declared_storage_class = class; \
3071 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3072 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3073 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3074 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3075 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3080 add_anchor_token(')');
3081 parse_microsoft_extended_decl_modifier(specifiers);
3082 rem_anchor_token(')');
3087 switch (specifiers->declared_storage_class) {
3088 case STORAGE_CLASS_NONE:
3089 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3092 case STORAGE_CLASS_EXTERN:
3093 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3096 case STORAGE_CLASS_STATIC:
3097 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3101 errorf(HERE, "multiple storage classes in declaration specifiers");
3107 /* type qualifiers */
3108 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3110 qualifiers |= qualifier; \
3114 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3115 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3116 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3117 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3118 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3119 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3120 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3121 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3123 case T___extension__:
3128 /* type specifiers */
3129 #define MATCH_SPECIFIER(token, specifier, name) \
3132 if (type_specifiers & specifier) { \
3133 errorf(HERE, "multiple " name " type specifiers given"); \
3135 type_specifiers |= specifier; \
3139 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3140 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3141 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3142 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3143 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3144 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3145 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3146 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3147 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3148 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3149 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3150 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3151 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3152 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3153 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3154 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3156 case T__forceinline:
3157 /* only in microsoft mode */
3158 specifiers->modifiers |= DM_FORCEINLINE;
3163 specifiers->is_inline = true;
3168 if (type_specifiers & SPECIFIER_LONG_LONG) {
3169 errorf(HERE, "multiple type specifiers given");
3170 } else if (type_specifiers & SPECIFIER_LONG) {
3171 type_specifiers |= SPECIFIER_LONG_LONG;
3173 type_specifiers |= SPECIFIER_LONG;
3178 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3180 type->compound.declaration = parse_compound_type_specifier(true);
3184 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3185 type->compound.declaration = parse_compound_type_specifier(false);
3186 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3187 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3191 type = parse_enum_specifier();
3194 type = parse_typeof();
3196 case T___builtin_va_list:
3197 type = duplicate_type(type_valist);
3201 case T_IDENTIFIER: {
3202 /* only parse identifier if we haven't found a type yet */
3203 if (type != NULL || type_specifiers != 0)
3204 goto finish_specifiers;
3206 type_t *typedef_type = get_typedef_type(token.v.symbol);
3208 if (typedef_type == NULL)
3209 goto finish_specifiers;
3212 type = typedef_type;
3216 /* function specifier */
3218 goto finish_specifiers;
3225 atomic_type_kind_t atomic_type;
3227 /* match valid basic types */
3228 switch(type_specifiers) {
3229 case SPECIFIER_VOID:
3230 atomic_type = ATOMIC_TYPE_VOID;
3232 case SPECIFIER_CHAR:
3233 atomic_type = ATOMIC_TYPE_CHAR;
3235 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3236 atomic_type = ATOMIC_TYPE_SCHAR;
3238 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3239 atomic_type = ATOMIC_TYPE_UCHAR;
3241 case SPECIFIER_SHORT:
3242 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3243 case SPECIFIER_SHORT | SPECIFIER_INT:
3244 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3245 atomic_type = ATOMIC_TYPE_SHORT;
3247 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3248 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3249 atomic_type = ATOMIC_TYPE_USHORT;
3252 case SPECIFIER_SIGNED:
3253 case SPECIFIER_SIGNED | SPECIFIER_INT:
3254 atomic_type = ATOMIC_TYPE_INT;
3256 case SPECIFIER_UNSIGNED:
3257 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3258 atomic_type = ATOMIC_TYPE_UINT;
3260 case SPECIFIER_LONG:
3261 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3262 case SPECIFIER_LONG | SPECIFIER_INT:
3263 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3264 atomic_type = ATOMIC_TYPE_LONG;
3266 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3267 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3268 atomic_type = ATOMIC_TYPE_ULONG;
3270 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3271 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3272 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3273 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3275 atomic_type = ATOMIC_TYPE_LONGLONG;
3277 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3278 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3280 atomic_type = ATOMIC_TYPE_ULONGLONG;
3283 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3284 atomic_type = unsigned_int8_type_kind;
3287 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3288 atomic_type = unsigned_int16_type_kind;
3291 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3292 atomic_type = unsigned_int32_type_kind;
3295 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3296 atomic_type = unsigned_int64_type_kind;
3299 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3300 atomic_type = unsigned_int128_type_kind;
3303 case SPECIFIER_INT8:
3304 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3305 atomic_type = int8_type_kind;
3308 case SPECIFIER_INT16:
3309 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3310 atomic_type = int16_type_kind;
3313 case SPECIFIER_INT32:
3314 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3315 atomic_type = int32_type_kind;
3318 case SPECIFIER_INT64:
3319 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3320 atomic_type = int64_type_kind;
3323 case SPECIFIER_INT128:
3324 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3325 atomic_type = int128_type_kind;
3328 case SPECIFIER_FLOAT:
3329 atomic_type = ATOMIC_TYPE_FLOAT;
3331 case SPECIFIER_DOUBLE:
3332 atomic_type = ATOMIC_TYPE_DOUBLE;
3334 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3335 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3337 case SPECIFIER_BOOL:
3338 atomic_type = ATOMIC_TYPE_BOOL;
3340 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3341 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3342 atomic_type = ATOMIC_TYPE_FLOAT;
3344 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3345 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3346 atomic_type = ATOMIC_TYPE_DOUBLE;
3348 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3349 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3350 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3353 /* invalid specifier combination, give an error message */
3354 if (type_specifiers == 0) {
3355 if (! strict_mode) {
3356 if (warning.implicit_int) {
3357 warningf(HERE, "no type specifiers in declaration, using 'int'");
3359 atomic_type = ATOMIC_TYPE_INT;
3362 errorf(HERE, "no type specifiers given in declaration");
3364 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3365 (type_specifiers & SPECIFIER_UNSIGNED)) {
3366 errorf(HERE, "signed and unsigned specifiers gives");
3367 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3368 errorf(HERE, "only integer types can be signed or unsigned");
3370 errorf(HERE, "multiple datatypes in declaration");
3372 atomic_type = ATOMIC_TYPE_INVALID;
3375 if (type_specifiers & SPECIFIER_COMPLEX &&
3376 atomic_type != ATOMIC_TYPE_INVALID) {
3377 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3378 type->complex.akind = atomic_type;
3379 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3380 atomic_type != ATOMIC_TYPE_INVALID) {
3381 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3382 type->imaginary.akind = atomic_type;
3384 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3385 type->atomic.akind = atomic_type;
3389 if (type_specifiers != 0) {
3390 errorf(HERE, "multiple datatypes in declaration");
3394 /* FIXME: check type qualifiers here */
3396 type->base.qualifiers = qualifiers;
3397 type->base.modifiers = modifiers;
3399 type_t *result = typehash_insert(type);
3400 if (newtype && result != type) {
3404 specifiers->type = result;
3409 static type_qualifiers_t parse_type_qualifiers(void)
3411 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3414 switch(token.type) {
3415 /* type qualifiers */
3416 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3417 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3418 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3419 /* microsoft extended type modifiers */
3420 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3421 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3422 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3423 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3424 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3432 static declaration_t *parse_identifier_list(void)
3434 declaration_t *declarations = NULL;
3435 declaration_t *last_declaration = NULL;
3437 declaration_t *const declaration = allocate_declaration_zero();
3438 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3439 declaration->source_position = token.source_position;
3440 declaration->symbol = token.v.symbol;
3443 if (last_declaration != NULL) {
3444 last_declaration->next = declaration;
3446 declarations = declaration;
3448 last_declaration = declaration;
3450 if (token.type != ',') {
3454 } while (token.type == T_IDENTIFIER);
3456 return declarations;
3459 static type_t *automatic_type_conversion(type_t *orig_type);
3461 static void semantic_parameter(declaration_t *declaration)
3463 /* TODO: improve error messages */
3465 if (declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3466 errorf(HERE, "typedef not allowed in parameter list");
3467 } else if (declaration->declared_storage_class != STORAGE_CLASS_NONE
3468 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3469 errorf(HERE, "parameter may only have none or register storage class");
3472 type_t *const orig_type = declaration->type;
3473 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3474 * sugar. Turn it into a pointer.
3475 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3476 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3478 type_t *const type = automatic_type_conversion(orig_type);
3479 declaration->type = type;
3481 if (is_type_incomplete(skip_typeref(type))) {
3482 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3483 orig_type, declaration->symbol);
3487 static declaration_t *parse_parameter(void)
3489 declaration_specifiers_t specifiers;
3490 memset(&specifiers, 0, sizeof(specifiers));
3492 parse_declaration_specifiers(&specifiers);
3494 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3499 static declaration_t *parse_parameters(function_type_t *type)
3501 declaration_t *declarations = NULL;
3504 add_anchor_token(')');
3505 int saved_comma_state = save_and_reset_anchor_state(',');
3507 if (token.type == T_IDENTIFIER) {
3508 symbol_t *symbol = token.v.symbol;
3509 if (!is_typedef_symbol(symbol)) {
3510 type->kr_style_parameters = true;
3511 declarations = parse_identifier_list();
3512 goto parameters_finished;
3516 if (token.type == ')') {
3517 type->unspecified_parameters = 1;
3518 goto parameters_finished;
3521 declaration_t *declaration;
3522 declaration_t *last_declaration = NULL;
3523 function_parameter_t *parameter;
3524 function_parameter_t *last_parameter = NULL;
3527 switch(token.type) {
3531 goto parameters_finished;
3534 case T___extension__:
3536 declaration = parse_parameter();
3538 /* func(void) is not a parameter */
3539 if (last_parameter == NULL
3540 && token.type == ')'
3541 && declaration->symbol == NULL
3542 && skip_typeref(declaration->type) == type_void) {
3543 goto parameters_finished;
3545 semantic_parameter(declaration);
3547 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3548 memset(parameter, 0, sizeof(parameter[0]));
3549 parameter->type = declaration->type;
3551 if (last_parameter != NULL) {
3552 last_declaration->next = declaration;
3553 last_parameter->next = parameter;
3555 type->parameters = parameter;
3556 declarations = declaration;
3558 last_parameter = parameter;
3559 last_declaration = declaration;
3563 goto parameters_finished;
3565 if (token.type != ',') {
3566 goto parameters_finished;
3572 parameters_finished:
3573 rem_anchor_token(')');
3576 restore_anchor_state(',', saved_comma_state);
3577 return declarations;
3580 restore_anchor_state(',', saved_comma_state);
3584 typedef enum construct_type_kind_t {
3589 } construct_type_kind_t;
3591 typedef struct construct_type_t construct_type_t;
3592 struct construct_type_t {
3593 construct_type_kind_t kind;
3594 construct_type_t *next;
3597 typedef struct parsed_pointer_t parsed_pointer_t;
3598 struct parsed_pointer_t {
3599 construct_type_t construct_type;
3600 type_qualifiers_t type_qualifiers;
3603 typedef struct construct_function_type_t construct_function_type_t;
3604 struct construct_function_type_t {
3605 construct_type_t construct_type;
3606 type_t *function_type;
3609 typedef struct parsed_array_t parsed_array_t;
3610 struct parsed_array_t {
3611 construct_type_t construct_type;
3612 type_qualifiers_t type_qualifiers;
3618 typedef struct construct_base_type_t construct_base_type_t;
3619 struct construct_base_type_t {
3620 construct_type_t construct_type;
3624 static construct_type_t *parse_pointer_declarator(void)
3628 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3629 memset(pointer, 0, sizeof(pointer[0]));
3630 pointer->construct_type.kind = CONSTRUCT_POINTER;
3631 pointer->type_qualifiers = parse_type_qualifiers();
3633 return (construct_type_t*) pointer;
3636 static construct_type_t *parse_array_declarator(void)
3639 add_anchor_token(']');
3641 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3642 memset(array, 0, sizeof(array[0]));
3643 array->construct_type.kind = CONSTRUCT_ARRAY;
3645 if (token.type == T_static) {
3646 array->is_static = true;
3650 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3651 if (type_qualifiers != 0) {
3652 if (token.type == T_static) {
3653 array->is_static = true;
3657 array->type_qualifiers = type_qualifiers;
3659 if (token.type == '*' && look_ahead(1)->type == ']') {
3660 array->is_variable = true;
3662 } else if (token.type != ']') {
3663 array->size = parse_assignment_expression();
3666 rem_anchor_token(']');
3669 return (construct_type_t*) array;
3674 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3677 if (declaration != NULL) {
3678 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3680 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3682 if (mask & (mask-1)) {
3683 const char *first = NULL, *second = NULL;
3685 /* more than one calling convention set */
3686 if (declaration->modifiers & DM_CDECL) {
3687 if (first == NULL) first = "cdecl";
3688 else if (second == NULL) second = "cdecl";
3690 if (declaration->modifiers & DM_STDCALL) {
3691 if (first == NULL) first = "stdcall";
3692 else if (second == NULL) second = "stdcall";
3694 if (declaration->modifiers & DM_FASTCALL) {
3695 if (first == NULL) first = "faslcall";
3696 else if (second == NULL) second = "fastcall";
3698 if (declaration->modifiers & DM_THISCALL) {
3699 if (first == NULL) first = "thiscall";
3700 else if (second == NULL) second = "thiscall";
3702 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3705 if (declaration->modifiers & DM_CDECL)
3706 type->function.calling_convention = CC_CDECL;
3707 else if (declaration->modifiers & DM_STDCALL)
3708 type->function.calling_convention = CC_STDCALL;
3709 else if (declaration->modifiers & DM_FASTCALL)
3710 type->function.calling_convention = CC_FASTCALL;
3711 else if (declaration->modifiers & DM_THISCALL)
3712 type->function.calling_convention = CC_THISCALL;
3714 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3717 declaration_t *parameters = parse_parameters(&type->function);
3718 if (declaration != NULL) {
3719 declaration->scope.declarations = parameters;
3722 construct_function_type_t *construct_function_type =
3723 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3724 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3725 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3726 construct_function_type->function_type = type;
3728 return &construct_function_type->construct_type;
3731 static void fix_declaration_type(declaration_t *declaration)
3733 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3734 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3736 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3737 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3739 if (declaration->type->base.modifiers == type_modifiers)
3742 type_t *copy = duplicate_type(declaration->type);
3743 copy->base.modifiers = type_modifiers;
3745 type_t *result = typehash_insert(copy);
3746 if (result != copy) {
3747 obstack_free(type_obst, copy);
3750 declaration->type = result;
3753 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3754 bool may_be_abstract)
3756 /* construct a single linked list of construct_type_t's which describe
3757 * how to construct the final declarator type */
3758 construct_type_t *first = NULL;
3759 construct_type_t *last = NULL;
3760 gnu_attribute_t *attributes = NULL;
3762 decl_modifiers_t modifiers = parse_attributes(&attributes);
3765 while (token.type == '*') {
3766 construct_type_t *type = parse_pointer_declarator();
3776 /* TODO: find out if this is correct */
3777 modifiers |= parse_attributes(&attributes);
3780 construct_type_t *inner_types = NULL;
3782 switch(token.type) {
3784 if (declaration == NULL) {
3785 errorf(HERE, "no identifier expected in typename");
3787 declaration->symbol = token.v.symbol;
3788 declaration->source_position = token.source_position;
3794 add_anchor_token(')');
3795 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3796 rem_anchor_token(')');
3800 if (may_be_abstract)
3802 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3803 /* avoid a loop in the outermost scope, because eat_statement doesn't
3805 if (token.type == '}' && current_function == NULL) {
3813 construct_type_t *p = last;
3816 construct_type_t *type;
3817 switch(token.type) {
3819 type = parse_function_declarator(declaration);
3822 type = parse_array_declarator();
3825 goto declarator_finished;
3828 /* insert in the middle of the list (behind p) */
3830 type->next = p->next;
3841 declarator_finished:
3842 /* append inner_types at the end of the list, we don't to set last anymore
3843 * as it's not needed anymore */
3845 assert(first == NULL);
3846 first = inner_types;
3848 last->next = inner_types;
3856 static void parse_declaration_attributes(declaration_t *declaration)
3858 gnu_attribute_t *attributes = NULL;
3859 decl_modifiers_t modifiers = parse_attributes(&attributes);
3861 if (declaration == NULL)
3864 declaration->modifiers |= modifiers;
3865 /* check if we have these stupid mode attributes... */
3866 type_t *old_type = declaration->type;
3867 if (old_type == NULL)
3870 gnu_attribute_t *attribute = attributes;
3871 for ( ; attribute != NULL; attribute = attribute->next) {
3872 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
3875 atomic_type_kind_t akind = attribute->u.akind;
3876 if (!is_type_signed(old_type)) {
3878 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
3879 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
3880 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
3881 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
3883 panic("invalid akind in mode attribute");
3887 = make_atomic_type(akind, old_type->base.qualifiers);
3891 static type_t *construct_declarator_type(construct_type_t *construct_list,
3894 construct_type_t *iter = construct_list;
3895 for( ; iter != NULL; iter = iter->next) {
3896 switch(iter->kind) {
3897 case CONSTRUCT_INVALID:
3898 internal_errorf(HERE, "invalid type construction found");
3899 case CONSTRUCT_FUNCTION: {
3900 construct_function_type_t *construct_function_type
3901 = (construct_function_type_t*) iter;
3903 type_t *function_type = construct_function_type->function_type;
3905 function_type->function.return_type = type;
3907 type_t *skipped_return_type = skip_typeref(type);
3908 if (is_type_function(skipped_return_type)) {
3909 errorf(HERE, "function returning function is not allowed");
3910 type = type_error_type;
3911 } else if (is_type_array(skipped_return_type)) {
3912 errorf(HERE, "function returning array is not allowed");
3913 type = type_error_type;
3915 type = function_type;
3920 case CONSTRUCT_POINTER: {
3921 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3922 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3923 pointer_type->pointer.points_to = type;
3924 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3926 type = pointer_type;
3930 case CONSTRUCT_ARRAY: {
3931 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3932 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3934 expression_t *size_expression = parsed_array->size;
3935 if (size_expression != NULL) {
3937 = create_implicit_cast(size_expression, type_size_t);
3940 array_type->base.qualifiers = parsed_array->type_qualifiers;
3941 array_type->array.element_type = type;
3942 array_type->array.is_static = parsed_array->is_static;
3943 array_type->array.is_variable = parsed_array->is_variable;
3944 array_type->array.size_expression = size_expression;
3946 if (size_expression != NULL) {
3947 if (is_constant_expression(size_expression)) {
3948 array_type->array.size_constant = true;
3949 array_type->array.size
3950 = fold_constant(size_expression);
3952 array_type->array.is_vla = true;
3956 type_t *skipped_type = skip_typeref(type);
3957 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3958 errorf(HERE, "array of void is not allowed");
3959 type = type_error_type;
3967 type_t *hashed_type = typehash_insert(type);
3968 if (hashed_type != type) {
3969 /* the function type was constructed earlier freeing it here will
3970 * destroy other types... */
3971 if (iter->kind != CONSTRUCT_FUNCTION) {
3981 static declaration_t *parse_declarator(
3982 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3984 declaration_t *const declaration = allocate_declaration_zero();
3985 declaration->declared_storage_class = specifiers->declared_storage_class;
3986 declaration->modifiers = specifiers->modifiers;
3987 declaration->deprecated = specifiers->deprecated;
3988 declaration->deprecated_string = specifiers->deprecated_string;
3989 declaration->get_property_sym = specifiers->get_property_sym;
3990 declaration->put_property_sym = specifiers->put_property_sym;
3991 declaration->is_inline = specifiers->is_inline;
3993 declaration->storage_class = specifiers->declared_storage_class;
3994 if (declaration->storage_class == STORAGE_CLASS_NONE
3995 && scope != global_scope) {
3996 declaration->storage_class = STORAGE_CLASS_AUTO;
3999 if (specifiers->alignment != 0) {
4000 /* TODO: add checks here */
4001 declaration->alignment = specifiers->alignment;
4004 construct_type_t *construct_type
4005 = parse_inner_declarator(declaration, may_be_abstract);
4006 type_t *const type = specifiers->type;
4007 declaration->type = construct_declarator_type(construct_type, type);
4009 parse_declaration_attributes(declaration);
4011 fix_declaration_type(declaration);
4013 if (construct_type != NULL) {
4014 obstack_free(&temp_obst, construct_type);
4020 static type_t *parse_abstract_declarator(type_t *base_type)
4022 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4024 type_t *result = construct_declarator_type(construct_type, base_type);
4025 if (construct_type != NULL) {
4026 obstack_free(&temp_obst, construct_type);
4032 static declaration_t *append_declaration(declaration_t* const declaration)
4034 if (last_declaration != NULL) {
4035 last_declaration->next = declaration;
4037 scope->declarations = declaration;
4039 last_declaration = declaration;
4044 * Check if the declaration of main is suspicious. main should be a
4045 * function with external linkage, returning int, taking either zero
4046 * arguments, two, or three arguments of appropriate types, ie.
4048 * int main([ int argc, char **argv [, char **env ] ]).
4050 * @param decl the declaration to check
4051 * @param type the function type of the declaration
4053 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4055 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4056 warningf(&decl->source_position,
4057 "'main' is normally a non-static function");
4059 if (skip_typeref(func_type->return_type) != type_int) {
4060 warningf(&decl->source_position,
4061 "return type of 'main' should be 'int', but is '%T'",
4062 func_type->return_type);
4064 const function_parameter_t *parm = func_type->parameters;
4066 type_t *const first_type = parm->type;
4067 if (!types_compatible(skip_typeref(first_type), type_int)) {
4068 warningf(&decl->source_position,
4069 "first argument of 'main' should be 'int', but is '%T'", first_type);
4073 type_t *const second_type = parm->type;
4074 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4075 warningf(&decl->source_position,
4076 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4080 type_t *const third_type = parm->type;
4081 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4082 warningf(&decl->source_position,
4083 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4087 goto warn_arg_count;
4091 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4097 * Check if a symbol is the equal to "main".
4099 static bool is_sym_main(const symbol_t *const sym)
4101 return strcmp(sym->string, "main") == 0;
4104 static declaration_t *internal_record_declaration(
4105 declaration_t *const declaration,
4106 const bool is_definition)
4108 const symbol_t *const symbol = declaration->symbol;
4109 const namespace_t namespc = (namespace_t)declaration->namespc;
4111 assert(declaration->symbol != NULL);
4112 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4114 type_t *const orig_type = declaration->type;
4115 type_t *const type = skip_typeref(orig_type);
4116 if (is_type_function(type) &&
4117 type->function.unspecified_parameters &&
4118 warning.strict_prototypes &&
4119 previous_declaration == NULL) {
4120 warningf(&declaration->source_position,
4121 "function declaration '%#T' is not a prototype",
4122 orig_type, declaration->symbol);
4125 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4126 check_type_of_main(declaration, &type->function);
4129 assert(declaration != previous_declaration);
4130 if (previous_declaration != NULL
4131 && previous_declaration->parent_scope == scope) {
4132 /* can happen for K&R style declarations */
4133 if (previous_declaration->type == NULL) {
4134 previous_declaration->type = declaration->type;
4137 const type_t *prev_type = skip_typeref(previous_declaration->type);
4138 if (!types_compatible(type, prev_type)) {
4139 errorf(&declaration->source_position,
4140 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4141 orig_type, symbol, previous_declaration->type, symbol,
4142 &previous_declaration->source_position);
4144 unsigned old_storage_class = previous_declaration->storage_class;
4145 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4146 errorf(&declaration->source_position,
4147 "redeclaration of enum entry '%Y' (declared %P)",
4148 symbol, &previous_declaration->source_position);
4149 return previous_declaration;
4152 if (warning.redundant_decls &&
4154 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4155 !(previous_declaration->modifiers & DM_USED) &&
4156 !previous_declaration->used) {
4157 warningf(&previous_declaration->source_position,
4158 "unnecessary static forward declaration for '%#T'",
4159 previous_declaration->type, symbol);
4162 unsigned new_storage_class = declaration->storage_class;
4164 if (is_type_incomplete(prev_type)) {
4165 previous_declaration->type = type;
4169 /* pretend no storage class means extern for function
4170 * declarations (except if the previous declaration is neither
4171 * none nor extern) */
4172 if (is_type_function(type)) {
4173 if (prev_type->function.unspecified_parameters) {
4174 previous_declaration->type = type;
4178 switch (old_storage_class) {
4179 case STORAGE_CLASS_NONE:
4180 old_storage_class = STORAGE_CLASS_EXTERN;
4183 case STORAGE_CLASS_EXTERN:
4184 if (is_definition) {
4185 if (warning.missing_prototypes &&
4186 prev_type->function.unspecified_parameters &&
4187 !is_sym_main(symbol)) {
4188 warningf(&declaration->source_position,
4189 "no previous prototype for '%#T'",
4192 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4193 new_storage_class = STORAGE_CLASS_EXTERN;
4202 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4203 new_storage_class == STORAGE_CLASS_EXTERN) {
4204 warn_redundant_declaration:
4205 if (!is_definition &&
4206 warning.redundant_decls &&
4207 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4208 warningf(&declaration->source_position,
4209 "redundant declaration for '%Y' (declared %P)",
4210 symbol, &previous_declaration->source_position);
4212 } else if (current_function == NULL) {
4213 if (old_storage_class != STORAGE_CLASS_STATIC &&
4214 new_storage_class == STORAGE_CLASS_STATIC) {
4215 errorf(&declaration->source_position,
4216 "static declaration of '%Y' follows non-static declaration (declared %P)",
4217 symbol, &previous_declaration->source_position);
4218 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4219 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4220 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4222 goto warn_redundant_declaration;
4224 } else if (old_storage_class == new_storage_class) {
4225 errorf(&declaration->source_position,
4226 "redeclaration of '%Y' (declared %P)",
4227 symbol, &previous_declaration->source_position);
4229 errorf(&declaration->source_position,
4230 "redeclaration of '%Y' with different linkage (declared %P)",
4231 symbol, &previous_declaration->source_position);
4235 if (declaration->is_inline)
4236 previous_declaration->is_inline = true;
4237 return previous_declaration;
4238 } else if (is_type_function(type)) {
4239 if (is_definition &&
4240 declaration->storage_class != STORAGE_CLASS_STATIC) {
4241 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4242 warningf(&declaration->source_position,
4243 "no previous prototype for '%#T'", orig_type, symbol);
4244 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4245 warningf(&declaration->source_position,
4246 "no previous declaration for '%#T'", orig_type,
4251 if (warning.missing_declarations &&
4252 scope == global_scope && (
4253 declaration->storage_class == STORAGE_CLASS_NONE ||
4254 declaration->storage_class == STORAGE_CLASS_THREAD
4256 warningf(&declaration->source_position,
4257 "no previous declaration for '%#T'", orig_type, symbol);
4261 assert(declaration->parent_scope == NULL);
4262 assert(scope != NULL);
4264 declaration->parent_scope = scope;
4266 environment_push(declaration);
4267 return append_declaration(declaration);
4270 static declaration_t *record_declaration(declaration_t *declaration)
4272 return internal_record_declaration(declaration, false);
4275 static declaration_t *record_definition(declaration_t *declaration)
4277 return internal_record_declaration(declaration, true);
4280 static void parser_error_multiple_definition(declaration_t *declaration,
4281 const source_position_t *source_position)
4283 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4284 declaration->symbol, &declaration->source_position);
4287 static bool is_declaration_specifier(const token_t *token,
4288 bool only_specifiers_qualifiers)
4290 switch(token->type) {
4295 return is_typedef_symbol(token->v.symbol);
4297 case T___extension__:
4299 return !only_specifiers_qualifiers;
4306 static void parse_init_declarator_rest(declaration_t *declaration)
4310 type_t *orig_type = declaration->type;
4311 type_t *type = skip_typeref(orig_type);
4313 if (declaration->init.initializer != NULL) {
4314 parser_error_multiple_definition(declaration, HERE);
4317 bool must_be_constant = false;
4318 if (declaration->storage_class == STORAGE_CLASS_STATIC
4319 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4320 || declaration->parent_scope == global_scope) {
4321 must_be_constant = true;
4324 parse_initializer_env_t env;
4325 env.type = orig_type;
4326 env.must_be_constant = must_be_constant;
4327 env.declaration = declaration;
4329 initializer_t *initializer = parse_initializer(&env);
4331 if (env.type != orig_type) {
4332 orig_type = env.type;
4333 type = skip_typeref(orig_type);
4334 declaration->type = env.type;
4337 if (is_type_function(type)) {
4338 errorf(&declaration->source_position,
4339 "initializers not allowed for function types at declator '%Y' (type '%T')",
4340 declaration->symbol, orig_type);
4342 declaration->init.initializer = initializer;
4346 /* parse rest of a declaration without any declarator */
4347 static void parse_anonymous_declaration_rest(
4348 const declaration_specifiers_t *specifiers,
4349 parsed_declaration_func finished_declaration)
4353 declaration_t *const declaration = allocate_declaration_zero();
4354 declaration->type = specifiers->type;
4355 declaration->declared_storage_class = specifiers->declared_storage_class;
4356 declaration->source_position = specifiers->source_position;
4357 declaration->modifiers = specifiers->modifiers;
4359 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4360 warningf(&declaration->source_position,
4361 "useless storage class in empty declaration");
4363 declaration->storage_class = STORAGE_CLASS_NONE;
4365 type_t *type = declaration->type;
4366 switch (type->kind) {
4367 case TYPE_COMPOUND_STRUCT:
4368 case TYPE_COMPOUND_UNION: {
4369 if (type->compound.declaration->symbol == NULL) {
4370 warningf(&declaration->source_position,
4371 "unnamed struct/union that defines no instances");
4380 warningf(&declaration->source_position, "empty declaration");
4384 finished_declaration(declaration);
4387 static void parse_declaration_rest(declaration_t *ndeclaration,
4388 const declaration_specifiers_t *specifiers,
4389 parsed_declaration_func finished_declaration)
4391 add_anchor_token(';');
4392 add_anchor_token('=');
4393 add_anchor_token(',');
4395 declaration_t *declaration = finished_declaration(ndeclaration);
4397 type_t *orig_type = declaration->type;
4398 type_t *type = skip_typeref(orig_type);
4400 if (type->kind != TYPE_FUNCTION &&
4401 declaration->is_inline &&
4402 is_type_valid(type)) {
4403 warningf(&declaration->source_position,
4404 "variable '%Y' declared 'inline'\n", declaration->symbol);
4407 if (token.type == '=') {
4408 parse_init_declarator_rest(declaration);
4411 if (token.type != ',')
4415 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4420 rem_anchor_token(';');
4421 rem_anchor_token('=');
4422 rem_anchor_token(',');
4425 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4427 symbol_t *symbol = declaration->symbol;
4428 if (symbol == NULL) {
4429 errorf(HERE, "anonymous declaration not valid as function parameter");
4432 namespace_t namespc = (namespace_t) declaration->namespc;
4433 if (namespc != NAMESPACE_NORMAL) {
4434 return record_declaration(declaration);
4437 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4438 if (previous_declaration == NULL ||
4439 previous_declaration->parent_scope != scope) {
4440 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4445 if (previous_declaration->type == NULL) {
4446 previous_declaration->type = declaration->type;
4447 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4448 previous_declaration->storage_class = declaration->storage_class;
4449 previous_declaration->parent_scope = scope;
4450 return previous_declaration;
4452 return record_declaration(declaration);
4456 static void parse_declaration(parsed_declaration_func finished_declaration)
4458 declaration_specifiers_t specifiers;
4459 memset(&specifiers, 0, sizeof(specifiers));
4460 parse_declaration_specifiers(&specifiers);
4462 if (token.type == ';') {
4463 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4465 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4466 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4470 static type_t *get_default_promoted_type(type_t *orig_type)
4472 type_t *result = orig_type;
4474 type_t *type = skip_typeref(orig_type);
4475 if (is_type_integer(type)) {
4476 result = promote_integer(type);
4477 } else if (type == type_float) {
4478 result = type_double;
4484 static void parse_kr_declaration_list(declaration_t *declaration)
4486 type_t *type = skip_typeref(declaration->type);
4487 if (!is_type_function(type))
4490 if (!type->function.kr_style_parameters)
4493 /* push function parameters */
4494 int top = environment_top();
4495 scope_t *last_scope = scope;
4496 set_scope(&declaration->scope);
4498 declaration_t *parameter = declaration->scope.declarations;
4499 for ( ; parameter != NULL; parameter = parameter->next) {
4500 assert(parameter->parent_scope == NULL);
4501 parameter->parent_scope = scope;
4502 environment_push(parameter);
4505 /* parse declaration list */
4506 while (is_declaration_specifier(&token, false)) {
4507 parse_declaration(finished_kr_declaration);
4510 /* pop function parameters */
4511 assert(scope == &declaration->scope);
4512 set_scope(last_scope);
4513 environment_pop_to(top);
4515 /* update function type */
4516 type_t *new_type = duplicate_type(type);
4518 function_parameter_t *parameters = NULL;
4519 function_parameter_t *last_parameter = NULL;
4521 declaration_t *parameter_declaration = declaration->scope.declarations;
4522 for( ; parameter_declaration != NULL;
4523 parameter_declaration = parameter_declaration->next) {
4524 type_t *parameter_type = parameter_declaration->type;
4525 if (parameter_type == NULL) {
4527 errorf(HERE, "no type specified for function parameter '%Y'",
4528 parameter_declaration->symbol);
4530 if (warning.implicit_int) {
4531 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4532 parameter_declaration->symbol);
4534 parameter_type = type_int;
4535 parameter_declaration->type = parameter_type;
4539 semantic_parameter(parameter_declaration);
4540 parameter_type = parameter_declaration->type;
4543 * we need the default promoted types for the function type
4545 parameter_type = get_default_promoted_type(parameter_type);
4547 function_parameter_t *function_parameter
4548 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4549 memset(function_parameter, 0, sizeof(function_parameter[0]));
4551 function_parameter->type = parameter_type;
4552 if (last_parameter != NULL) {
4553 last_parameter->next = function_parameter;
4555 parameters = function_parameter;
4557 last_parameter = function_parameter;
4560 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4562 new_type->function.parameters = parameters;
4563 new_type->function.unspecified_parameters = true;
4565 type = typehash_insert(new_type);
4566 if (type != new_type) {
4567 obstack_free(type_obst, new_type);
4570 declaration->type = type;
4573 static bool first_err = true;
4576 * When called with first_err set, prints the name of the current function,
4579 static void print_in_function(void)
4583 diagnosticf("%s: In function '%Y':\n",
4584 current_function->source_position.input_name,
4585 current_function->symbol);
4590 * Check if all labels are defined in the current function.
4591 * Check if all labels are used in the current function.
4593 static void check_labels(void)
4595 for (const goto_statement_t *goto_statement = goto_first;
4596 goto_statement != NULL;
4597 goto_statement = goto_statement->next) {
4598 declaration_t *label = goto_statement->label;
4601 if (label->source_position.input_name == NULL) {
4602 print_in_function();
4603 errorf(&goto_statement->base.source_position,
4604 "label '%Y' used but not defined", label->symbol);
4607 goto_first = goto_last = NULL;
4609 if (warning.unused_label) {
4610 for (const label_statement_t *label_statement = label_first;
4611 label_statement != NULL;
4612 label_statement = label_statement->next) {
4613 const declaration_t *label = label_statement->label;
4615 if (! label->used) {
4616 print_in_function();
4617 warningf(&label_statement->base.source_position,
4618 "label '%Y' defined but not used", label->symbol);
4622 label_first = label_last = NULL;
4626 * Check declarations of current_function for unused entities.
4628 static void check_declarations(void)
4630 if (warning.unused_parameter) {
4631 const scope_t *scope = ¤t_function->scope;
4633 const declaration_t *parameter = scope->declarations;
4634 for (; parameter != NULL; parameter = parameter->next) {
4635 if (! parameter->used) {
4636 print_in_function();
4637 warningf(¶meter->source_position,
4638 "unused parameter '%Y'", parameter->symbol);
4642 if (warning.unused_variable) {
4646 static void parse_external_declaration(void)
4648 /* function-definitions and declarations both start with declaration
4650 declaration_specifiers_t specifiers;
4651 memset(&specifiers, 0, sizeof(specifiers));
4653 add_anchor_token(';');
4654 parse_declaration_specifiers(&specifiers);
4655 rem_anchor_token(';');
4657 /* must be a declaration */
4658 if (token.type == ';') {
4659 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4663 add_anchor_token(',');
4664 add_anchor_token('=');
4665 rem_anchor_token(';');
4667 /* declarator is common to both function-definitions and declarations */
4668 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4670 rem_anchor_token(',');
4671 rem_anchor_token('=');
4672 rem_anchor_token(';');
4674 /* must be a declaration */
4675 switch (token.type) {
4678 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4682 parse_declaration_rest(ndeclaration, &specifiers, record_definition);
4686 /* must be a function definition */
4687 parse_kr_declaration_list(ndeclaration);
4689 if (token.type != '{') {
4690 parse_error_expected("while parsing function definition", '{', NULL);
4691 eat_until_matching_token(';');
4695 type_t *type = ndeclaration->type;
4697 /* note that we don't skip typerefs: the standard doesn't allow them here
4698 * (so we can't use is_type_function here) */
4699 if (type->kind != TYPE_FUNCTION) {
4700 if (is_type_valid(type)) {
4701 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4702 type, ndeclaration->symbol);
4708 /* § 6.7.5.3 (14) a function definition with () means no
4709 * parameters (and not unspecified parameters) */
4710 if (type->function.unspecified_parameters
4711 && type->function.parameters == NULL
4712 && !type->function.kr_style_parameters) {
4713 type_t *duplicate = duplicate_type(type);
4714 duplicate->function.unspecified_parameters = false;
4716 type = typehash_insert(duplicate);
4717 if (type != duplicate) {
4718 obstack_free(type_obst, duplicate);
4720 ndeclaration->type = type;
4723 declaration_t *const declaration = record_definition(ndeclaration);
4724 if (ndeclaration != declaration) {
4725 declaration->scope = ndeclaration->scope;
4727 type = skip_typeref(declaration->type);
4729 /* push function parameters and switch scope */
4730 int top = environment_top();
4731 scope_t *last_scope = scope;
4732 set_scope(&declaration->scope);
4734 declaration_t *parameter = declaration->scope.declarations;
4735 for( ; parameter != NULL; parameter = parameter->next) {
4736 if (parameter->parent_scope == &ndeclaration->scope) {
4737 parameter->parent_scope = scope;
4739 assert(parameter->parent_scope == NULL
4740 || parameter->parent_scope == scope);
4741 parameter->parent_scope = scope;
4742 if (parameter->symbol == NULL) {
4743 errorf(&ndeclaration->source_position, "parameter name omitted");
4746 environment_push(parameter);
4749 if (declaration->init.statement != NULL) {
4750 parser_error_multiple_definition(declaration, HERE);
4753 /* parse function body */
4754 int label_stack_top = label_top();
4755 declaration_t *old_current_function = current_function;
4756 current_function = declaration;
4758 declaration->init.statement = parse_compound_statement(false);
4761 check_declarations();
4763 assert(current_function == declaration);
4764 current_function = old_current_function;
4765 label_pop_to(label_stack_top);
4768 assert(scope == &declaration->scope);
4769 set_scope(last_scope);
4770 environment_pop_to(top);
4773 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4774 source_position_t *source_position)
4776 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4778 type->bitfield.base_type = base_type;
4779 type->bitfield.size = size;
4784 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4787 declaration_t *iter = compound_declaration->scope.declarations;
4788 for( ; iter != NULL; iter = iter->next) {
4789 if (iter->namespc != NAMESPACE_NORMAL)
4792 if (iter->symbol == NULL) {
4793 type_t *type = skip_typeref(iter->type);
4794 if (is_type_compound(type)) {
4795 declaration_t *result
4796 = find_compound_entry(type->compound.declaration, symbol);
4803 if (iter->symbol == symbol) {
4811 static void parse_compound_declarators(declaration_t *struct_declaration,
4812 const declaration_specifiers_t *specifiers)
4814 declaration_t *last_declaration = struct_declaration->scope.declarations;
4815 if (last_declaration != NULL) {
4816 while(last_declaration->next != NULL) {
4817 last_declaration = last_declaration->next;
4822 declaration_t *declaration;
4824 if (token.type == ':') {
4825 source_position_t source_position = *HERE;
4828 type_t *base_type = specifiers->type;
4829 expression_t *size = parse_constant_expression();
4831 if (!is_type_integer(skip_typeref(base_type))) {
4832 errorf(HERE, "bitfield base type '%T' is not an integer type",
4836 type_t *type = make_bitfield_type(base_type, size, &source_position);
4838 declaration = allocate_declaration_zero();
4839 declaration->namespc = NAMESPACE_NORMAL;
4840 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4841 declaration->storage_class = STORAGE_CLASS_NONE;
4842 declaration->source_position = source_position;
4843 declaration->modifiers = specifiers->modifiers;
4844 declaration->type = type;
4846 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4848 type_t *orig_type = declaration->type;
4849 type_t *type = skip_typeref(orig_type);
4851 if (token.type == ':') {
4852 source_position_t source_position = *HERE;
4854 expression_t *size = parse_constant_expression();
4856 if (!is_type_integer(type)) {
4857 errorf(HERE, "bitfield base type '%T' is not an "
4858 "integer type", orig_type);
4861 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4862 declaration->type = bitfield_type;
4864 /* TODO we ignore arrays for now... what is missing is a check
4865 * that they're at the end of the struct */
4866 if (is_type_incomplete(type) && !is_type_array(type)) {
4868 "compound member '%Y' has incomplete type '%T'",
4869 declaration->symbol, orig_type);
4870 } else if (is_type_function(type)) {
4871 errorf(HERE, "compound member '%Y' must not have function "
4872 "type '%T'", declaration->symbol, orig_type);
4877 /* make sure we don't define a symbol multiple times */
4878 symbol_t *symbol = declaration->symbol;
4879 if (symbol != NULL) {
4880 declaration_t *prev_decl
4881 = find_compound_entry(struct_declaration, symbol);
4883 if (prev_decl != NULL) {
4884 assert(prev_decl->symbol == symbol);
4885 errorf(&declaration->source_position,
4886 "multiple declarations of symbol '%Y' (declared %P)",
4887 symbol, &prev_decl->source_position);
4891 /* append declaration */
4892 if (last_declaration != NULL) {
4893 last_declaration->next = declaration;
4895 struct_declaration->scope.declarations = declaration;
4897 last_declaration = declaration;
4899 if (token.type != ',')
4909 static void parse_compound_type_entries(declaration_t *compound_declaration)
4912 add_anchor_token('}');
4914 while(token.type != '}' && token.type != T_EOF) {
4915 declaration_specifiers_t specifiers;
4916 memset(&specifiers, 0, sizeof(specifiers));
4917 parse_declaration_specifiers(&specifiers);
4919 parse_compound_declarators(compound_declaration, &specifiers);
4921 rem_anchor_token('}');
4923 if (token.type == T_EOF) {
4924 errorf(HERE, "EOF while parsing struct");
4929 static type_t *parse_typename(void)
4931 declaration_specifiers_t specifiers;
4932 memset(&specifiers, 0, sizeof(specifiers));
4933 parse_declaration_specifiers(&specifiers);
4934 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4935 /* TODO: improve error message, user does probably not know what a
4936 * storage class is...
4938 errorf(HERE, "typename may not have a storage class");
4941 type_t *result = parse_abstract_declarator(specifiers.type);
4949 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4950 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4951 expression_t *left);
4953 typedef struct expression_parser_function_t expression_parser_function_t;
4954 struct expression_parser_function_t {
4955 unsigned precedence;
4956 parse_expression_function parser;
4957 unsigned infix_precedence;
4958 parse_expression_infix_function infix_parser;
4961 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4964 * Prints an error message if an expression was expected but not read
4966 static expression_t *expected_expression_error(void)
4968 /* skip the error message if the error token was read */
4969 if (token.type != T_ERROR) {
4970 errorf(HERE, "expected expression, got token '%K'", &token);
4974 return create_invalid_expression();
4978 * Parse a string constant.
4980 static expression_t *parse_string_const(void)
4983 if (token.type == T_STRING_LITERAL) {
4984 string_t res = token.v.string;
4986 while (token.type == T_STRING_LITERAL) {
4987 res = concat_strings(&res, &token.v.string);
4990 if (token.type != T_WIDE_STRING_LITERAL) {
4991 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4992 /* note: that we use type_char_ptr here, which is already the
4993 * automatic converted type. revert_automatic_type_conversion
4994 * will construct the array type */
4995 cnst->base.type = type_char_ptr;
4996 cnst->string.value = res;
5000 wres = concat_string_wide_string(&res, &token.v.wide_string);
5002 wres = token.v.wide_string;
5007 switch (token.type) {
5008 case T_WIDE_STRING_LITERAL:
5009 wres = concat_wide_strings(&wres, &token.v.wide_string);
5012 case T_STRING_LITERAL:
5013 wres = concat_wide_string_string(&wres, &token.v.string);
5017 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5018 cnst->base.type = type_wchar_t_ptr;
5019 cnst->wide_string.value = wres;
5028 * Parse an integer constant.
5030 static expression_t *parse_int_const(void)
5032 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5033 cnst->base.source_position = *HERE;
5034 cnst->base.type = token.datatype;
5035 cnst->conste.v.int_value = token.v.intvalue;
5043 * Parse a character constant.
5045 static expression_t *parse_character_constant(void)
5047 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5049 cnst->base.source_position = *HERE;
5050 cnst->base.type = token.datatype;
5051 cnst->conste.v.character = token.v.string;
5053 if (cnst->conste.v.character.size != 1) {
5054 if (warning.multichar && (c_mode & _GNUC)) {
5056 warningf(HERE, "multi-character character constant");
5058 errorf(HERE, "more than 1 characters in character constant");
5067 * Parse a wide character constant.
5069 static expression_t *parse_wide_character_constant(void)
5071 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5073 cnst->base.source_position = *HERE;
5074 cnst->base.type = token.datatype;
5075 cnst->conste.v.wide_character = token.v.wide_string;
5077 if (cnst->conste.v.wide_character.size != 1) {
5078 if (warning.multichar && (c_mode & _GNUC)) {
5080 warningf(HERE, "multi-character character constant");
5082 errorf(HERE, "more than 1 characters in character constant");
5091 * Parse a float constant.
5093 static expression_t *parse_float_const(void)
5095 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5096 cnst->base.type = token.datatype;
5097 cnst->conste.v.float_value = token.v.floatvalue;
5104 static declaration_t *create_implicit_function(symbol_t *symbol,
5105 const source_position_t *source_position)
5107 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5108 ntype->function.return_type = type_int;
5109 ntype->function.unspecified_parameters = true;
5111 type_t *type = typehash_insert(ntype);
5112 if (type != ntype) {
5116 declaration_t *const declaration = allocate_declaration_zero();
5117 declaration->storage_class = STORAGE_CLASS_EXTERN;
5118 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5119 declaration->type = type;
5120 declaration->symbol = symbol;
5121 declaration->source_position = *source_position;
5123 bool strict_prototypes_old = warning.strict_prototypes;
5124 warning.strict_prototypes = false;
5125 record_declaration(declaration);
5126 warning.strict_prototypes = strict_prototypes_old;
5132 * Creates a return_type (func)(argument_type) function type if not
5135 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5136 type_t *argument_type2)
5138 function_parameter_t *parameter2
5139 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5140 memset(parameter2, 0, sizeof(parameter2[0]));
5141 parameter2->type = argument_type2;
5143 function_parameter_t *parameter1
5144 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5145 memset(parameter1, 0, sizeof(parameter1[0]));
5146 parameter1->type = argument_type1;
5147 parameter1->next = parameter2;
5149 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5150 type->function.return_type = return_type;
5151 type->function.parameters = parameter1;
5153 type_t *result = typehash_insert(type);
5154 if (result != type) {
5162 * Creates a return_type (func)(argument_type) function type if not
5165 * @param return_type the return type
5166 * @param argument_type the argument type
5168 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5170 function_parameter_t *parameter
5171 = obstack_alloc(type_obst, sizeof(parameter[0]));
5172 memset(parameter, 0, sizeof(parameter[0]));
5173 parameter->type = argument_type;
5175 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5176 type->function.return_type = return_type;
5177 type->function.parameters = parameter;
5179 type_t *result = typehash_insert(type);
5180 if (result != type) {
5187 static type_t *make_function_0_type(type_t *return_type)
5189 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5190 type->function.return_type = return_type;
5191 type->function.parameters = NULL;
5193 type_t *result = typehash_insert(type);
5194 if (result != type) {
5202 * Creates a function type for some function like builtins.
5204 * @param symbol the symbol describing the builtin
5206 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5208 switch(symbol->ID) {
5209 case T___builtin_alloca:
5210 return make_function_1_type(type_void_ptr, type_size_t);
5211 case T___builtin_huge_val:
5212 return make_function_0_type(type_double);
5213 case T___builtin_nan:
5214 return make_function_1_type(type_double, type_char_ptr);
5215 case T___builtin_nanf:
5216 return make_function_1_type(type_float, type_char_ptr);
5217 case T___builtin_nand:
5218 return make_function_1_type(type_long_double, type_char_ptr);
5219 case T___builtin_va_end:
5220 return make_function_1_type(type_void, type_valist);
5221 case T___builtin_expect:
5222 return make_function_2_type(type_long, type_long, type_long);
5224 internal_errorf(HERE, "not implemented builtin symbol found");
5229 * Performs automatic type cast as described in § 6.3.2.1.
5231 * @param orig_type the original type
5233 static type_t *automatic_type_conversion(type_t *orig_type)
5235 type_t *type = skip_typeref(orig_type);
5236 if (is_type_array(type)) {
5237 array_type_t *array_type = &type->array;
5238 type_t *element_type = array_type->element_type;
5239 unsigned qualifiers = array_type->base.qualifiers;
5241 return make_pointer_type(element_type, qualifiers);
5244 if (is_type_function(type)) {
5245 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
5252 * reverts the automatic casts of array to pointer types and function
5253 * to function-pointer types as defined § 6.3.2.1
5255 type_t *revert_automatic_type_conversion(const expression_t *expression)
5257 switch (expression->kind) {
5258 case EXPR_REFERENCE: return expression->reference.declaration->type;
5259 case EXPR_SELECT: return expression->select.compound_entry->type;
5261 case EXPR_UNARY_DEREFERENCE: {
5262 const expression_t *const value = expression->unary.value;
5263 type_t *const type = skip_typeref(value->base.type);
5264 assert(is_type_pointer(type));
5265 return type->pointer.points_to;
5268 case EXPR_BUILTIN_SYMBOL:
5269 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
5271 case EXPR_ARRAY_ACCESS: {
5272 const expression_t *array_ref = expression->array_access.array_ref;
5273 type_t *type_left = skip_typeref(array_ref->base.type);
5274 if (!is_type_valid(type_left))
5276 assert(is_type_pointer(type_left));
5277 return type_left->pointer.points_to;
5280 case EXPR_STRING_LITERAL: {
5281 size_t size = expression->string.value.size;
5282 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
5285 case EXPR_WIDE_STRING_LITERAL: {
5286 size_t size = expression->wide_string.value.size;
5287 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
5290 case EXPR_COMPOUND_LITERAL:
5291 return expression->compound_literal.type;
5296 return expression->base.type;
5299 static expression_t *parse_reference(void)
5301 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
5303 reference_expression_t *ref = &expression->reference;
5304 symbol_t *const symbol = token.v.symbol;
5306 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
5308 source_position_t source_position = token.source_position;
5311 if (declaration == NULL) {
5312 if (! strict_mode && token.type == '(') {
5313 /* an implicitly defined function */
5314 if (warning.implicit_function_declaration) {
5315 warningf(HERE, "implicit declaration of function '%Y'",
5319 declaration = create_implicit_function(symbol,
5322 errorf(HERE, "unknown symbol '%Y' found.", symbol);
5323 return create_invalid_expression();
5327 type_t *type = declaration->type;
5329 /* we always do the auto-type conversions; the & and sizeof parser contains
5330 * code to revert this! */
5331 type = automatic_type_conversion(type);
5333 ref->declaration = declaration;
5334 ref->base.type = type;
5336 /* this declaration is used */
5337 declaration->used = true;
5339 /* check for deprecated functions */
5340 if (declaration->deprecated != 0) {
5341 const char *prefix = "";
5342 if (is_type_function(declaration->type))
5343 prefix = "function ";
5345 if (declaration->deprecated_string != NULL) {
5346 warningf(&source_position,
5347 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
5348 declaration->deprecated_string);
5350 warningf(&source_position,
5351 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
5358 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5362 /* TODO check if explicit cast is allowed and issue warnings/errors */
5365 static expression_t *parse_compound_literal(type_t *type)
5367 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5369 parse_initializer_env_t env;
5371 env.declaration = NULL;
5372 env.must_be_constant = false;
5373 initializer_t *initializer = parse_initializer(&env);
5376 expression->compound_literal.initializer = initializer;
5377 expression->compound_literal.type = type;
5378 expression->base.type = automatic_type_conversion(type);
5384 * Parse a cast expression.
5386 static expression_t *parse_cast(void)
5388 source_position_t source_position = token.source_position;
5390 type_t *type = parse_typename();
5392 /* matching add_anchor_token() is at call site */
5393 rem_anchor_token(')');
5396 if (token.type == '{') {
5397 return parse_compound_literal(type);
5400 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5401 cast->base.source_position = source_position;
5403 expression_t *value = parse_sub_expression(20);
5405 check_cast_allowed(value, type);
5407 cast->base.type = type;
5408 cast->unary.value = value;
5412 return create_invalid_expression();
5416 * Parse a statement expression.
5418 static expression_t *parse_statement_expression(void)
5420 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5422 statement_t *statement = parse_compound_statement(true);
5423 expression->statement.statement = statement;
5424 expression->base.source_position = statement->base.source_position;
5426 /* find last statement and use its type */
5427 type_t *type = type_void;
5428 const statement_t *stmt = statement->compound.statements;
5430 while (stmt->base.next != NULL)
5431 stmt = stmt->base.next;
5433 if (stmt->kind == STATEMENT_EXPRESSION) {
5434 type = stmt->expression.expression->base.type;
5437 warningf(&expression->base.source_position, "empty statement expression ({})");
5439 expression->base.type = type;
5445 return create_invalid_expression();
5449 * Parse a braced expression.
5451 static expression_t *parse_brace_expression(void)
5454 add_anchor_token(')');
5456 switch(token.type) {
5458 /* gcc extension: a statement expression */
5459 return parse_statement_expression();
5463 return parse_cast();
5465 if (is_typedef_symbol(token.v.symbol)) {
5466 return parse_cast();
5470 expression_t *result = parse_expression();
5471 rem_anchor_token(')');
5476 return create_invalid_expression();
5479 static expression_t *parse_function_keyword(void)
5484 if (current_function == NULL) {
5485 errorf(HERE, "'__func__' used outside of a function");
5488 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5489 expression->base.type = type_char_ptr;
5490 expression->funcname.kind = FUNCNAME_FUNCTION;
5495 static expression_t *parse_pretty_function_keyword(void)
5497 eat(T___PRETTY_FUNCTION__);
5499 if (current_function == NULL) {
5500 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5503 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5504 expression->base.type = type_char_ptr;
5505 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5510 static expression_t *parse_funcsig_keyword(void)
5514 if (current_function == NULL) {
5515 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5518 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5519 expression->base.type = type_char_ptr;
5520 expression->funcname.kind = FUNCNAME_FUNCSIG;
5525 static expression_t *parse_funcdname_keyword(void)
5527 eat(T___FUNCDNAME__);
5529 if (current_function == NULL) {
5530 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5533 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5534 expression->base.type = type_char_ptr;
5535 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5540 static designator_t *parse_designator(void)
5542 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5543 result->source_position = *HERE;
5545 if (token.type != T_IDENTIFIER) {
5546 parse_error_expected("while parsing member designator",
5547 T_IDENTIFIER, NULL);
5550 result->symbol = token.v.symbol;
5553 designator_t *last_designator = result;
5555 if (token.type == '.') {
5557 if (token.type != T_IDENTIFIER) {
5558 parse_error_expected("while parsing member designator",
5559 T_IDENTIFIER, NULL);
5562 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5563 designator->source_position = *HERE;
5564 designator->symbol = token.v.symbol;
5567 last_designator->next = designator;
5568 last_designator = designator;
5571 if (token.type == '[') {
5573 add_anchor_token(']');
5574 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5575 designator->source_position = *HERE;
5576 designator->array_index = parse_expression();
5577 rem_anchor_token(']');
5579 if (designator->array_index == NULL) {
5583 last_designator->next = designator;
5584 last_designator = designator;
5596 * Parse the __builtin_offsetof() expression.
5598 static expression_t *parse_offsetof(void)
5600 eat(T___builtin_offsetof);
5602 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5603 expression->base.type = type_size_t;
5606 add_anchor_token(',');
5607 type_t *type = parse_typename();
5608 rem_anchor_token(',');
5610 add_anchor_token(')');
5611 designator_t *designator = parse_designator();
5612 rem_anchor_token(')');
5615 expression->offsetofe.type = type;
5616 expression->offsetofe.designator = designator;
5619 memset(&path, 0, sizeof(path));
5620 path.top_type = type;
5621 path.path = NEW_ARR_F(type_path_entry_t, 0);
5623 descend_into_subtype(&path);
5625 if (!walk_designator(&path, designator, true)) {
5626 return create_invalid_expression();
5629 DEL_ARR_F(path.path);
5633 return create_invalid_expression();
5637 * Parses a _builtin_va_start() expression.
5639 static expression_t *parse_va_start(void)
5641 eat(T___builtin_va_start);
5643 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5646 add_anchor_token(',');
5647 expression->va_starte.ap = parse_assignment_expression();
5648 rem_anchor_token(',');
5650 expression_t *const expr = parse_assignment_expression();
5651 if (expr->kind == EXPR_REFERENCE) {
5652 declaration_t *const decl = expr->reference.declaration;
5654 return create_invalid_expression();
5655 if (decl->parent_scope == ¤t_function->scope &&
5656 decl->next == NULL) {
5657 expression->va_starte.parameter = decl;
5662 errorf(&expr->base.source_position,
5663 "second argument of 'va_start' must be last parameter of the current function");
5665 return create_invalid_expression();
5669 * Parses a _builtin_va_arg() expression.
5671 static expression_t *parse_va_arg(void)
5673 eat(T___builtin_va_arg);
5675 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5678 expression->va_arge.ap = parse_assignment_expression();
5680 expression->base.type = parse_typename();
5685 return create_invalid_expression();
5688 static expression_t *parse_builtin_symbol(void)
5690 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5692 symbol_t *symbol = token.v.symbol;
5694 expression->builtin_symbol.symbol = symbol;
5697 type_t *type = get_builtin_symbol_type(symbol);
5698 type = automatic_type_conversion(type);
5700 expression->base.type = type;
5705 * Parses a __builtin_constant() expression.
5707 static expression_t *parse_builtin_constant(void)
5709 eat(T___builtin_constant_p);
5711 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5714 add_anchor_token(')');
5715 expression->builtin_constant.value = parse_assignment_expression();
5716 rem_anchor_token(')');
5718 expression->base.type = type_int;
5722 return create_invalid_expression();
5726 * Parses a __builtin_prefetch() expression.
5728 static expression_t *parse_builtin_prefetch(void)
5730 eat(T___builtin_prefetch);
5732 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5735 add_anchor_token(')');
5736 expression->builtin_prefetch.adr = parse_assignment_expression();
5737 if (token.type == ',') {
5739 expression->builtin_prefetch.rw = parse_assignment_expression();
5741 if (token.type == ',') {
5743 expression->builtin_prefetch.locality = parse_assignment_expression();
5745 rem_anchor_token(')');
5747 expression->base.type = type_void;
5751 return create_invalid_expression();
5755 * Parses a __builtin_is_*() compare expression.
5757 static expression_t *parse_compare_builtin(void)
5759 expression_t *expression;
5761 switch(token.type) {
5762 case T___builtin_isgreater:
5763 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5765 case T___builtin_isgreaterequal:
5766 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5768 case T___builtin_isless:
5769 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5771 case T___builtin_islessequal:
5772 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5774 case T___builtin_islessgreater:
5775 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5777 case T___builtin_isunordered:
5778 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5781 internal_errorf(HERE, "invalid compare builtin found");
5784 expression->base.source_position = *HERE;
5788 expression->binary.left = parse_assignment_expression();
5790 expression->binary.right = parse_assignment_expression();
5793 type_t *const orig_type_left = expression->binary.left->base.type;
5794 type_t *const orig_type_right = expression->binary.right->base.type;
5796 type_t *const type_left = skip_typeref(orig_type_left);
5797 type_t *const type_right = skip_typeref(orig_type_right);
5798 if (!is_type_float(type_left) && !is_type_float(type_right)) {
5799 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5800 type_error_incompatible("invalid operands in comparison",
5801 &expression->base.source_position, orig_type_left, orig_type_right);
5804 semantic_comparison(&expression->binary);
5809 return create_invalid_expression();
5814 * Parses a __builtin_expect() expression.
5816 static expression_t *parse_builtin_expect(void)
5818 eat(T___builtin_expect);
5820 expression_t *expression
5821 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5824 expression->binary.left = parse_assignment_expression();
5826 expression->binary.right = parse_constant_expression();
5829 expression->base.type = expression->binary.left->base.type;
5833 return create_invalid_expression();
5838 * Parses a MS assume() expression.
5840 static expression_t *parse_assume(void)
5844 expression_t *expression
5845 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5848 add_anchor_token(')');
5849 expression->unary.value = parse_assignment_expression();
5850 rem_anchor_token(')');
5853 expression->base.type = type_void;
5856 return create_invalid_expression();
5860 * Parse a microsoft __noop expression.
5862 static expression_t *parse_noop_expression(void)
5864 source_position_t source_position = *HERE;
5867 if (token.type == '(') {
5868 /* parse arguments */
5870 add_anchor_token(')');
5871 add_anchor_token(',');
5873 if (token.type != ')') {
5875 (void)parse_assignment_expression();
5876 if (token.type != ',')
5882 rem_anchor_token(',');
5883 rem_anchor_token(')');
5886 /* the result is a (int)0 */
5887 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5888 cnst->base.source_position = source_position;
5889 cnst->base.type = type_int;
5890 cnst->conste.v.int_value = 0;
5891 cnst->conste.is_ms_noop = true;
5896 return create_invalid_expression();
5900 * Parses a primary expression.
5902 static expression_t *parse_primary_expression(void)
5904 switch (token.type) {
5905 case T_INTEGER: return parse_int_const();
5906 case T_CHARACTER_CONSTANT: return parse_character_constant();
5907 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5908 case T_FLOATINGPOINT: return parse_float_const();
5909 case T_STRING_LITERAL:
5910 case T_WIDE_STRING_LITERAL: return parse_string_const();
5911 case T_IDENTIFIER: return parse_reference();
5912 case T___FUNCTION__:
5913 case T___func__: return parse_function_keyword();
5914 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5915 case T___FUNCSIG__: return parse_funcsig_keyword();
5916 case T___FUNCDNAME__: return parse_funcdname_keyword();
5917 case T___builtin_offsetof: return parse_offsetof();
5918 case T___builtin_va_start: return parse_va_start();
5919 case T___builtin_va_arg: return parse_va_arg();
5920 case T___builtin_expect:
5921 case T___builtin_alloca:
5922 case T___builtin_nan:
5923 case T___builtin_nand:
5924 case T___builtin_nanf:
5925 case T___builtin_huge_val:
5926 case T___builtin_va_end: return parse_builtin_symbol();
5927 case T___builtin_isgreater:
5928 case T___builtin_isgreaterequal:
5929 case T___builtin_isless:
5930 case T___builtin_islessequal:
5931 case T___builtin_islessgreater:
5932 case T___builtin_isunordered: return parse_compare_builtin();
5933 case T___builtin_constant_p: return parse_builtin_constant();
5934 case T___builtin_prefetch: return parse_builtin_prefetch();
5935 case T__assume: return parse_assume();
5937 case '(': return parse_brace_expression();
5938 case T___noop: return parse_noop_expression();
5941 errorf(HERE, "unexpected token %K, expected an expression", &token);
5942 return create_invalid_expression();
5946 * Check if the expression has the character type and issue a warning then.
5948 static void check_for_char_index_type(const expression_t *expression)
5950 type_t *const type = expression->base.type;
5951 const type_t *const base_type = skip_typeref(type);
5953 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5954 warning.char_subscripts) {
5955 warningf(&expression->base.source_position,
5956 "array subscript has type '%T'", type);
5960 static expression_t *parse_array_expression(unsigned precedence,
5966 add_anchor_token(']');
5968 expression_t *inside = parse_expression();
5970 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5972 array_access_expression_t *array_access = &expression->array_access;
5974 type_t *const orig_type_left = left->base.type;
5975 type_t *const orig_type_inside = inside->base.type;
5977 type_t *const type_left = skip_typeref(orig_type_left);
5978 type_t *const type_inside = skip_typeref(orig_type_inside);
5980 type_t *return_type;
5981 if (is_type_pointer(type_left)) {
5982 return_type = type_left->pointer.points_to;
5983 array_access->array_ref = left;
5984 array_access->index = inside;
5985 check_for_char_index_type(inside);
5986 } else if (is_type_pointer(type_inside)) {
5987 return_type = type_inside->pointer.points_to;
5988 array_access->array_ref = inside;
5989 array_access->index = left;
5990 array_access->flipped = true;
5991 check_for_char_index_type(left);
5993 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5995 "array access on object with non-pointer types '%T', '%T'",
5996 orig_type_left, orig_type_inside);
5998 return_type = type_error_type;
5999 array_access->array_ref = create_invalid_expression();
6002 rem_anchor_token(']');
6003 if (token.type != ']') {
6004 parse_error_expected("Problem while parsing array access", ']', NULL);
6009 return_type = automatic_type_conversion(return_type);
6010 expression->base.type = return_type;
6015 static expression_t *parse_typeprop(expression_kind_t const kind,
6016 source_position_t const pos,
6017 unsigned const precedence)
6019 expression_t *tp_expression = allocate_expression_zero(kind);
6020 tp_expression->base.type = type_size_t;
6021 tp_expression->base.source_position = pos;
6023 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6025 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6027 add_anchor_token(')');
6028 type_t* const orig_type = parse_typename();
6029 tp_expression->typeprop.type = orig_type;
6031 type_t const* const type = skip_typeref(orig_type);
6032 char const* const wrong_type =
6033 is_type_incomplete(type) ? "incomplete" :
6034 type->kind == TYPE_FUNCTION ? "function designator" :
6035 type->kind == TYPE_BITFIELD ? "bitfield" :
6037 if (wrong_type != NULL) {
6038 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6039 what, wrong_type, type);
6042 rem_anchor_token(')');
6045 expression_t *expression = parse_sub_expression(precedence);
6047 type_t* const orig_type = revert_automatic_type_conversion(expression);
6048 expression->base.type = orig_type;
6050 type_t const* const type = skip_typeref(orig_type);
6051 char const* const wrong_type =
6052 is_type_incomplete(type) ? "incomplete" :
6053 type->kind == TYPE_FUNCTION ? "function designator" :
6054 type->kind == TYPE_BITFIELD ? "bitfield" :
6056 if (wrong_type != NULL) {
6057 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6060 tp_expression->typeprop.type = expression->base.type;
6061 tp_expression->typeprop.tp_expression = expression;
6064 return tp_expression;
6066 return create_invalid_expression();
6069 static expression_t *parse_sizeof(unsigned precedence)
6071 source_position_t pos = *HERE;
6073 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
6076 static expression_t *parse_alignof(unsigned precedence)
6078 source_position_t pos = *HERE;
6080 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
6083 static expression_t *parse_select_expression(unsigned precedence,
6084 expression_t *compound)
6087 assert(token.type == '.' || token.type == T_MINUSGREATER);
6089 bool is_pointer = (token.type == T_MINUSGREATER);
6092 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6093 select->select.compound = compound;
6095 if (token.type != T_IDENTIFIER) {
6096 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6099 symbol_t *symbol = token.v.symbol;
6100 select->select.symbol = symbol;
6103 type_t *const orig_type = compound->base.type;
6104 type_t *const type = skip_typeref(orig_type);
6106 type_t *type_left = type;
6108 if (!is_type_pointer(type)) {
6109 if (is_type_valid(type)) {
6110 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
6112 return create_invalid_expression();
6114 type_left = type->pointer.points_to;
6116 type_left = skip_typeref(type_left);
6118 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
6119 type_left->kind != TYPE_COMPOUND_UNION) {
6120 if (is_type_valid(type_left)) {
6121 errorf(HERE, "request for member '%Y' in something not a struct or "
6122 "union, but '%T'", symbol, type_left);
6124 return create_invalid_expression();
6127 declaration_t *const declaration = type_left->compound.declaration;
6129 if (!declaration->init.complete) {
6130 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
6132 return create_invalid_expression();
6135 declaration_t *iter = find_compound_entry(declaration, symbol);
6137 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
6138 return create_invalid_expression();
6141 /* we always do the auto-type conversions; the & and sizeof parser contains
6142 * code to revert this! */
6143 type_t *expression_type = automatic_type_conversion(iter->type);
6145 select->select.compound_entry = iter;
6146 select->base.type = expression_type;
6148 type_t *skipped = skip_typeref(iter->type);
6149 if (skipped->kind == TYPE_BITFIELD) {
6150 select->base.type = skipped->bitfield.base_type;
6156 static void check_call_argument(const function_parameter_t *parameter,
6157 call_argument_t *argument)
6159 type_t *expected_type = parameter->type;
6160 type_t *expected_type_skip = skip_typeref(expected_type);
6161 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
6162 expression_t *arg_expr = argument->expression;
6164 /* handle transparent union gnu extension */
6165 if (is_type_union(expected_type_skip)
6166 && (expected_type_skip->base.modifiers
6167 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
6168 declaration_t *union_decl = expected_type_skip->compound.declaration;
6170 declaration_t *declaration = union_decl->scope.declarations;
6171 type_t *best_type = NULL;
6172 for ( ; declaration != NULL; declaration = declaration->next) {
6173 type_t *decl_type = declaration->type;
6174 error = semantic_assign(decl_type, arg_expr);
6175 if (error == ASSIGN_ERROR_INCOMPATIBLE
6176 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
6179 if (error == ASSIGN_SUCCESS) {
6180 best_type = decl_type;
6181 } else if (best_type == NULL) {
6182 best_type = decl_type;
6186 if (best_type != NULL) {
6187 expected_type = best_type;
6191 error = semantic_assign(expected_type, arg_expr);
6192 argument->expression = create_implicit_cast(argument->expression,
6195 /* TODO report exact scope in error messages (like "in 3rd parameter") */
6196 report_assign_error(error, expected_type, arg_expr, "function call",
6197 &arg_expr->base.source_position);
6201 * Parse a call expression, ie. expression '( ... )'.
6203 * @param expression the function address
6205 static expression_t *parse_call_expression(unsigned precedence,
6206 expression_t *expression)
6209 expression_t *result = allocate_expression_zero(EXPR_CALL);
6210 result->base.source_position = expression->base.source_position;
6212 call_expression_t *call = &result->call;
6213 call->function = expression;
6215 type_t *const orig_type = expression->base.type;
6216 type_t *const type = skip_typeref(orig_type);
6218 function_type_t *function_type = NULL;
6219 if (is_type_pointer(type)) {
6220 type_t *const to_type = skip_typeref(type->pointer.points_to);
6222 if (is_type_function(to_type)) {
6223 function_type = &to_type->function;
6224 call->base.type = function_type->return_type;
6228 if (function_type == NULL && is_type_valid(type)) {
6229 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
6232 /* parse arguments */
6234 add_anchor_token(')');
6235 add_anchor_token(',');
6237 if (token.type != ')') {
6238 call_argument_t *last_argument = NULL;
6241 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
6243 argument->expression = parse_assignment_expression();
6244 if (last_argument == NULL) {
6245 call->arguments = argument;
6247 last_argument->next = argument;
6249 last_argument = argument;
6251 if (token.type != ',')
6256 rem_anchor_token(',');
6257 rem_anchor_token(')');
6260 if (function_type == NULL)
6263 function_parameter_t *parameter = function_type->parameters;
6264 call_argument_t *argument = call->arguments;
6265 if (!function_type->unspecified_parameters) {
6266 for( ; parameter != NULL && argument != NULL;
6267 parameter = parameter->next, argument = argument->next) {
6268 check_call_argument(parameter, argument);
6271 if (parameter != NULL) {
6272 errorf(HERE, "too few arguments to function '%E'", expression);
6273 } else if (argument != NULL && !function_type->variadic) {
6274 errorf(HERE, "too many arguments to function '%E'", expression);
6278 /* do default promotion */
6279 for( ; argument != NULL; argument = argument->next) {
6280 type_t *type = argument->expression->base.type;
6282 type = get_default_promoted_type(type);
6284 argument->expression
6285 = create_implicit_cast(argument->expression, type);
6288 check_format(&result->call);
6292 return create_invalid_expression();
6295 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
6297 static bool same_compound_type(const type_t *type1, const type_t *type2)
6300 is_type_compound(type1) &&
6301 type1->kind == type2->kind &&
6302 type1->compound.declaration == type2->compound.declaration;
6306 * Parse a conditional expression, ie. 'expression ? ... : ...'.
6308 * @param expression the conditional expression
6310 static expression_t *parse_conditional_expression(unsigned precedence,
6311 expression_t *expression)
6314 add_anchor_token(':');
6316 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
6318 conditional_expression_t *conditional = &result->conditional;
6319 conditional->condition = expression;
6322 type_t *const condition_type_orig = expression->base.type;
6323 type_t *const condition_type = skip_typeref(condition_type_orig);
6324 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
6325 type_error("expected a scalar type in conditional condition",
6326 &expression->base.source_position, condition_type_orig);
6329 expression_t *true_expression = parse_expression();
6330 rem_anchor_token(':');
6332 expression_t *false_expression = parse_sub_expression(precedence);
6334 type_t *const orig_true_type = true_expression->base.type;
6335 type_t *const orig_false_type = false_expression->base.type;
6336 type_t *const true_type = skip_typeref(orig_true_type);
6337 type_t *const false_type = skip_typeref(orig_false_type);
6340 type_t *result_type;
6341 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
6342 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6343 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
6344 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6345 warningf(&expression->base.source_position,
6346 "ISO C forbids conditional expression with only one void side");
6348 result_type = type_void;
6349 } else if (is_type_arithmetic(true_type)
6350 && is_type_arithmetic(false_type)) {
6351 result_type = semantic_arithmetic(true_type, false_type);
6353 true_expression = create_implicit_cast(true_expression, result_type);
6354 false_expression = create_implicit_cast(false_expression, result_type);
6356 conditional->true_expression = true_expression;
6357 conditional->false_expression = false_expression;
6358 conditional->base.type = result_type;
6359 } else if (same_compound_type(true_type, false_type)) {
6360 /* just take 1 of the 2 types */
6361 result_type = true_type;
6362 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
6363 type_t *pointer_type;
6365 expression_t *other_expression;
6366 if (is_type_pointer(true_type) &&
6367 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
6368 pointer_type = true_type;
6369 other_type = false_type;
6370 other_expression = false_expression;
6372 pointer_type = false_type;
6373 other_type = true_type;
6374 other_expression = true_expression;
6377 if (is_null_pointer_constant(other_expression)) {
6378 result_type = pointer_type;
6379 } else if (is_type_pointer(other_type)) {
6380 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
6381 type_t *to2 = skip_typeref(other_type->pointer.points_to);
6384 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
6385 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
6387 } else if (types_compatible(get_unqualified_type(to1),
6388 get_unqualified_type(to2))) {
6391 warningf(&expression->base.source_position,
6392 "pointer types '%T' and '%T' in conditional expression are incompatible",
6393 true_type, false_type);
6397 type_t *const copy = duplicate_type(to);
6398 copy->base.qualifiers = to1->base.qualifiers | to2->base.qualifiers;
6400 type_t *const type = typehash_insert(copy);
6404 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
6405 } else if (is_type_integer(other_type)) {
6406 warningf(&expression->base.source_position,
6407 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
6408 result_type = pointer_type;
6410 type_error_incompatible("while parsing conditional",
6411 &expression->base.source_position, true_type, false_type);
6412 result_type = type_error_type;
6415 /* TODO: one pointer to void*, other some pointer */
6417 if (is_type_valid(true_type) && is_type_valid(false_type)) {
6418 type_error_incompatible("while parsing conditional",
6419 &expression->base.source_position, true_type,
6422 result_type = type_error_type;
6425 conditional->true_expression
6426 = create_implicit_cast(true_expression, result_type);
6427 conditional->false_expression
6428 = create_implicit_cast(false_expression, result_type);
6429 conditional->base.type = result_type;
6432 return create_invalid_expression();
6436 * Parse an extension expression.
6438 static expression_t *parse_extension(unsigned precedence)
6440 eat(T___extension__);
6442 /* TODO enable extensions */
6443 expression_t *expression = parse_sub_expression(precedence);
6444 /* TODO disable extensions */
6449 * Parse a __builtin_classify_type() expression.
6451 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6453 eat(T___builtin_classify_type);
6455 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6456 result->base.type = type_int;
6459 add_anchor_token(')');
6460 expression_t *expression = parse_sub_expression(precedence);
6461 rem_anchor_token(')');
6463 result->classify_type.type_expression = expression;
6467 return create_invalid_expression();
6470 static void check_pointer_arithmetic(const source_position_t *source_position,
6471 type_t *pointer_type,
6472 type_t *orig_pointer_type)
6474 type_t *points_to = pointer_type->pointer.points_to;
6475 points_to = skip_typeref(points_to);
6477 if (is_type_incomplete(points_to) &&
6479 || !is_type_atomic(points_to, ATOMIC_TYPE_VOID))) {
6480 errorf(source_position,
6481 "arithmetic with pointer to incomplete type '%T' not allowed",
6483 } else if (is_type_function(points_to)) {
6484 errorf(source_position,
6485 "arithmetic with pointer to function type '%T' not allowed",
6490 static void semantic_incdec(unary_expression_t *expression)
6492 type_t *const orig_type = expression->value->base.type;
6493 type_t *const type = skip_typeref(orig_type);
6494 if (is_type_pointer(type)) {
6495 check_pointer_arithmetic(&expression->base.source_position,
6497 } else if (!is_type_real(type) && is_type_valid(type)) {
6498 /* TODO: improve error message */
6499 errorf(HERE, "operation needs an arithmetic or pointer type");
6501 expression->base.type = orig_type;
6504 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6506 type_t *const orig_type = expression->value->base.type;
6507 type_t *const type = skip_typeref(orig_type);
6508 if (!is_type_arithmetic(type)) {
6509 if (is_type_valid(type)) {
6510 /* TODO: improve error message */
6511 errorf(HERE, "operation needs an arithmetic type");
6516 expression->base.type = orig_type;
6519 static void semantic_unexpr_scalar(unary_expression_t *expression)
6521 type_t *const orig_type = expression->value->base.type;
6522 type_t *const type = skip_typeref(orig_type);
6523 if (!is_type_scalar(type)) {
6524 if (is_type_valid(type)) {
6525 errorf(HERE, "operand of ! must be of scalar type");
6530 expression->base.type = orig_type;
6533 static void semantic_unexpr_integer(unary_expression_t *expression)
6535 type_t *const orig_type = expression->value->base.type;
6536 type_t *const type = skip_typeref(orig_type);
6537 if (!is_type_integer(type)) {
6538 if (is_type_valid(type)) {
6539 errorf(HERE, "operand of ~ must be of integer type");
6544 expression->base.type = orig_type;
6547 static void semantic_dereference(unary_expression_t *expression)
6549 type_t *const orig_type = expression->value->base.type;
6550 type_t *const type = skip_typeref(orig_type);
6551 if (!is_type_pointer(type)) {
6552 if (is_type_valid(type)) {
6553 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6558 type_t *result_type = type->pointer.points_to;
6559 result_type = automatic_type_conversion(result_type);
6560 expression->base.type = result_type;
6563 static void set_address_taken(expression_t *expression, bool may_be_register)
6565 if (expression->kind != EXPR_REFERENCE)
6568 declaration_t *const declaration = expression->reference.declaration;
6569 /* happens for parse errors */
6570 if (declaration == NULL)
6573 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
6574 errorf(&expression->base.source_position,
6575 "address of register variable '%Y' requested",
6576 declaration->symbol);
6578 declaration->address_taken = 1;
6583 * Check the semantic of the address taken expression.
6585 static void semantic_take_addr(unary_expression_t *expression)
6587 expression_t *value = expression->value;
6588 value->base.type = revert_automatic_type_conversion(value);
6590 type_t *orig_type = value->base.type;
6591 if (!is_type_valid(orig_type))
6594 set_address_taken(value, false);
6596 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6599 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6600 static expression_t *parse_##unexpression_type(unsigned precedence) \
6604 expression_t *unary_expression \
6605 = allocate_expression_zero(unexpression_type); \
6606 unary_expression->base.source_position = *HERE; \
6607 unary_expression->unary.value = parse_sub_expression(precedence); \
6609 sfunc(&unary_expression->unary); \
6611 return unary_expression; \
6614 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6615 semantic_unexpr_arithmetic)
6616 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6617 semantic_unexpr_arithmetic)
6618 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6619 semantic_unexpr_scalar)
6620 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6621 semantic_dereference)
6622 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6624 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6625 semantic_unexpr_integer)
6626 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6628 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6631 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6633 static expression_t *parse_##unexpression_type(unsigned precedence, \
6634 expression_t *left) \
6636 (void) precedence; \
6639 expression_t *unary_expression \
6640 = allocate_expression_zero(unexpression_type); \
6641 unary_expression->unary.value = left; \
6643 sfunc(&unary_expression->unary); \
6645 return unary_expression; \
6648 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6649 EXPR_UNARY_POSTFIX_INCREMENT,
6651 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6652 EXPR_UNARY_POSTFIX_DECREMENT,
6655 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6657 /* TODO: handle complex + imaginary types */
6659 /* § 6.3.1.8 Usual arithmetic conversions */
6660 if (type_left == type_long_double || type_right == type_long_double) {
6661 return type_long_double;
6662 } else if (type_left == type_double || type_right == type_double) {
6664 } else if (type_left == type_float || type_right == type_float) {
6668 type_left = promote_integer(type_left);
6669 type_right = promote_integer(type_right);
6671 if (type_left == type_right)
6674 bool const signed_left = is_type_signed(type_left);
6675 bool const signed_right = is_type_signed(type_right);
6676 int const rank_left = get_rank(type_left);
6677 int const rank_right = get_rank(type_right);
6679 if (signed_left == signed_right)
6680 return rank_left >= rank_right ? type_left : type_right;
6689 u_rank = rank_right;
6690 u_type = type_right;
6692 s_rank = rank_right;
6693 s_type = type_right;
6698 if (u_rank >= s_rank)
6701 if (get_atomic_type_size(s_rank) > get_atomic_type_size(u_rank))
6705 type_t *const type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
6707 case ATOMIC_TYPE_INT: type->atomic.akind = ATOMIC_TYPE_UINT; break;
6708 case ATOMIC_TYPE_LONG: type->atomic.akind = ATOMIC_TYPE_ULONG; break;
6709 case ATOMIC_TYPE_LONGLONG: type->atomic.akind = ATOMIC_TYPE_ULONGLONG; break;
6711 default: panic("invalid atomic type");
6714 type_t* const result = typehash_insert(type);
6722 * Check the semantic restrictions for a binary expression.
6724 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6726 expression_t *const left = expression->left;
6727 expression_t *const right = expression->right;
6728 type_t *const orig_type_left = left->base.type;
6729 type_t *const orig_type_right = right->base.type;
6730 type_t *const type_left = skip_typeref(orig_type_left);
6731 type_t *const type_right = skip_typeref(orig_type_right);
6733 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6734 /* TODO: improve error message */
6735 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6736 errorf(HERE, "operation needs arithmetic types");
6741 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6742 expression->left = create_implicit_cast(left, arithmetic_type);
6743 expression->right = create_implicit_cast(right, arithmetic_type);
6744 expression->base.type = arithmetic_type;
6747 static void semantic_shift_op(binary_expression_t *expression)
6749 expression_t *const left = expression->left;
6750 expression_t *const right = expression->right;
6751 type_t *const orig_type_left = left->base.type;
6752 type_t *const orig_type_right = right->base.type;
6753 type_t * type_left = skip_typeref(orig_type_left);
6754 type_t * type_right = skip_typeref(orig_type_right);
6756 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
6757 /* TODO: improve error message */
6758 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6759 errorf(HERE, "operation needs integer types");
6764 type_left = promote_integer(type_left);
6765 type_right = promote_integer(type_right);
6767 expression->left = create_implicit_cast(left, type_left);
6768 expression->right = create_implicit_cast(right, type_right);
6769 expression->base.type = type_left;
6772 static void semantic_add(binary_expression_t *expression)
6774 expression_t *const left = expression->left;
6775 expression_t *const right = expression->right;
6776 type_t *const orig_type_left = left->base.type;
6777 type_t *const orig_type_right = right->base.type;
6778 type_t *const type_left = skip_typeref(orig_type_left);
6779 type_t *const type_right = skip_typeref(orig_type_right);
6782 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6783 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6784 expression->left = create_implicit_cast(left, arithmetic_type);
6785 expression->right = create_implicit_cast(right, arithmetic_type);
6786 expression->base.type = arithmetic_type;
6788 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6789 check_pointer_arithmetic(&expression->base.source_position,
6790 type_left, orig_type_left);
6791 expression->base.type = type_left;
6792 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
6793 check_pointer_arithmetic(&expression->base.source_position,
6794 type_right, orig_type_right);
6795 expression->base.type = type_right;
6796 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6797 errorf(&expression->base.source_position,
6798 "invalid operands to binary + ('%T', '%T')",
6799 orig_type_left, orig_type_right);
6803 static void semantic_sub(binary_expression_t *expression)
6805 expression_t *const left = expression->left;
6806 expression_t *const right = expression->right;
6807 type_t *const orig_type_left = left->base.type;
6808 type_t *const orig_type_right = right->base.type;
6809 type_t *const type_left = skip_typeref(orig_type_left);
6810 type_t *const type_right = skip_typeref(orig_type_right);
6813 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6814 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6815 expression->left = create_implicit_cast(left, arithmetic_type);
6816 expression->right = create_implicit_cast(right, arithmetic_type);
6817 expression->base.type = arithmetic_type;
6819 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6820 check_pointer_arithmetic(&expression->base.source_position,
6821 type_left, orig_type_left);
6822 expression->base.type = type_left;
6823 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6824 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
6825 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
6826 if (!types_compatible(unqual_left, unqual_right)) {
6827 errorf(&expression->base.source_position,
6828 "subtracting pointers to incompatible types '%T' and '%T'",
6829 orig_type_left, orig_type_right);
6830 } else if (!is_type_object(unqual_left)) {
6831 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
6832 warningf(&expression->base.source_position,
6833 "subtracting pointers to void");
6835 errorf(&expression->base.source_position,
6836 "subtracting pointers to non-object types '%T'",
6840 expression->base.type = type_ptrdiff_t;
6841 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6842 errorf(HERE, "invalid operands of types '%T' and '%T' to binary '-'",
6843 orig_type_left, orig_type_right);
6848 * Check the semantics of comparison expressions.
6850 * @param expression The expression to check.
6852 static void semantic_comparison(binary_expression_t *expression)
6854 expression_t *left = expression->left;
6855 expression_t *right = expression->right;
6856 type_t *orig_type_left = left->base.type;
6857 type_t *orig_type_right = right->base.type;
6859 type_t *type_left = skip_typeref(orig_type_left);
6860 type_t *type_right = skip_typeref(orig_type_right);
6862 /* TODO non-arithmetic types */
6863 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6864 /* test for signed vs unsigned compares */
6865 if (warning.sign_compare &&
6866 (expression->base.kind != EXPR_BINARY_EQUAL &&
6867 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6868 (is_type_signed(type_left) != is_type_signed(type_right))) {
6870 /* check if 1 of the operands is a constant, in this case we just
6871 * check wether we can safely represent the resulting constant in
6872 * the type of the other operand. */
6873 expression_t *const_expr = NULL;
6874 expression_t *other_expr = NULL;
6876 if (is_constant_expression(left)) {
6879 } else if (is_constant_expression(right)) {
6884 if (const_expr != NULL) {
6885 type_t *other_type = skip_typeref(other_expr->base.type);
6886 long val = fold_constant(const_expr);
6887 /* TODO: check if val can be represented by other_type */
6891 warningf(&expression->base.source_position,
6892 "comparison between signed and unsigned");
6894 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6895 expression->left = create_implicit_cast(left, arithmetic_type);
6896 expression->right = create_implicit_cast(right, arithmetic_type);
6897 expression->base.type = arithmetic_type;
6898 if (warning.float_equal &&
6899 (expression->base.kind == EXPR_BINARY_EQUAL ||
6900 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6901 is_type_float(arithmetic_type)) {
6902 warningf(&expression->base.source_position,
6903 "comparing floating point with == or != is unsafe");
6905 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6906 /* TODO check compatibility */
6907 } else if (is_type_pointer(type_left)) {
6908 expression->right = create_implicit_cast(right, type_left);
6909 } else if (is_type_pointer(type_right)) {
6910 expression->left = create_implicit_cast(left, type_right);
6911 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6912 type_error_incompatible("invalid operands in comparison",
6913 &expression->base.source_position,
6914 type_left, type_right);
6916 expression->base.type = type_int;
6920 * Checks if a compound type has constant fields.
6922 static bool has_const_fields(const compound_type_t *type)
6924 const scope_t *scope = &type->declaration->scope;
6925 const declaration_t *declaration = scope->declarations;
6927 for (; declaration != NULL; declaration = declaration->next) {
6928 if (declaration->namespc != NAMESPACE_NORMAL)
6931 const type_t *decl_type = skip_typeref(declaration->type);
6932 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6939 static bool is_lvalue(const expression_t *expression)
6941 switch (expression->kind) {
6942 case EXPR_REFERENCE:
6943 case EXPR_ARRAY_ACCESS:
6945 case EXPR_UNARY_DEREFERENCE:
6953 static bool is_valid_assignment_lhs(expression_t const* const left)
6955 type_t *const orig_type_left = revert_automatic_type_conversion(left);
6956 type_t *const type_left = skip_typeref(orig_type_left);
6958 if (!is_lvalue(left)) {
6959 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
6964 if (is_type_array(type_left)) {
6965 errorf(HERE, "cannot assign to arrays ('%E')", left);
6968 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6969 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6973 if (is_type_incomplete(type_left)) {
6974 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
6975 left, orig_type_left);
6978 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6979 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6980 left, orig_type_left);
6987 static void semantic_arithmetic_assign(binary_expression_t *expression)
6989 expression_t *left = expression->left;
6990 expression_t *right = expression->right;
6991 type_t *orig_type_left = left->base.type;
6992 type_t *orig_type_right = right->base.type;
6994 if (!is_valid_assignment_lhs(left))
6997 type_t *type_left = skip_typeref(orig_type_left);
6998 type_t *type_right = skip_typeref(orig_type_right);
7000 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7001 /* TODO: improve error message */
7002 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7003 errorf(HERE, "operation needs arithmetic types");
7008 /* combined instructions are tricky. We can't create an implicit cast on
7009 * the left side, because we need the uncasted form for the store.
7010 * The ast2firm pass has to know that left_type must be right_type
7011 * for the arithmetic operation and create a cast by itself */
7012 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7013 expression->right = create_implicit_cast(right, arithmetic_type);
7014 expression->base.type = type_left;
7017 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
7019 expression_t *const left = expression->left;
7020 expression_t *const right = expression->right;
7021 type_t *const orig_type_left = left->base.type;
7022 type_t *const orig_type_right = right->base.type;
7023 type_t *const type_left = skip_typeref(orig_type_left);
7024 type_t *const type_right = skip_typeref(orig_type_right);
7026 if (!is_valid_assignment_lhs(left))
7029 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7030 /* combined instructions are tricky. We can't create an implicit cast on
7031 * the left side, because we need the uncasted form for the store.
7032 * The ast2firm pass has to know that left_type must be right_type
7033 * for the arithmetic operation and create a cast by itself */
7034 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
7035 expression->right = create_implicit_cast(right, arithmetic_type);
7036 expression->base.type = type_left;
7037 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7038 check_pointer_arithmetic(&expression->base.source_position,
7039 type_left, orig_type_left);
7040 expression->base.type = type_left;
7041 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7042 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
7047 * Check the semantic restrictions of a logical expression.
7049 static void semantic_logical_op(binary_expression_t *expression)
7051 expression_t *const left = expression->left;
7052 expression_t *const right = expression->right;
7053 type_t *const orig_type_left = left->base.type;
7054 type_t *const orig_type_right = right->base.type;
7055 type_t *const type_left = skip_typeref(orig_type_left);
7056 type_t *const type_right = skip_typeref(orig_type_right);
7058 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
7059 /* TODO: improve error message */
7060 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7061 errorf(HERE, "operation needs scalar types");
7066 expression->base.type = type_int;
7070 * Check the semantic restrictions of a binary assign expression.
7072 static void semantic_binexpr_assign(binary_expression_t *expression)
7074 expression_t *left = expression->left;
7075 type_t *orig_type_left = left->base.type;
7077 type_t *type_left = revert_automatic_type_conversion(left);
7078 type_left = skip_typeref(orig_type_left);
7080 if (!is_valid_assignment_lhs(left))
7083 assign_error_t error = semantic_assign(orig_type_left, expression->right);
7084 report_assign_error(error, orig_type_left, expression->right,
7085 "assignment", &left->base.source_position);
7086 expression->right = create_implicit_cast(expression->right, orig_type_left);
7087 expression->base.type = orig_type_left;
7091 * Determine if the outermost operation (or parts thereof) of the given
7092 * expression has no effect in order to generate a warning about this fact.
7093 * Therefore in some cases this only examines some of the operands of the
7094 * expression (see comments in the function and examples below).
7096 * f() + 23; // warning, because + has no effect
7097 * x || f(); // no warning, because x controls execution of f()
7098 * x ? y : f(); // warning, because y has no effect
7099 * (void)x; // no warning to be able to suppress the warning
7100 * This function can NOT be used for an "expression has definitely no effect"-
7102 static bool expression_has_effect(const expression_t *const expr)
7104 switch (expr->kind) {
7105 case EXPR_UNKNOWN: break;
7106 case EXPR_INVALID: return true; /* do NOT warn */
7107 case EXPR_REFERENCE: return false;
7108 /* suppress the warning for microsoft __noop operations */
7109 case EXPR_CONST: return expr->conste.is_ms_noop;
7110 case EXPR_CHARACTER_CONSTANT: return false;
7111 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
7112 case EXPR_STRING_LITERAL: return false;
7113 case EXPR_WIDE_STRING_LITERAL: return false;
7116 const call_expression_t *const call = &expr->call;
7117 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
7120 switch (call->function->builtin_symbol.symbol->ID) {
7121 case T___builtin_va_end: return true;
7122 default: return false;
7126 /* Generate the warning if either the left or right hand side of a
7127 * conditional expression has no effect */
7128 case EXPR_CONDITIONAL: {
7129 const conditional_expression_t *const cond = &expr->conditional;
7131 expression_has_effect(cond->true_expression) &&
7132 expression_has_effect(cond->false_expression);
7135 case EXPR_SELECT: return false;
7136 case EXPR_ARRAY_ACCESS: return false;
7137 case EXPR_SIZEOF: return false;
7138 case EXPR_CLASSIFY_TYPE: return false;
7139 case EXPR_ALIGNOF: return false;
7141 case EXPR_FUNCNAME: return false;
7142 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
7143 case EXPR_BUILTIN_CONSTANT_P: return false;
7144 case EXPR_BUILTIN_PREFETCH: return true;
7145 case EXPR_OFFSETOF: return false;
7146 case EXPR_VA_START: return true;
7147 case EXPR_VA_ARG: return true;
7148 case EXPR_STATEMENT: return true; // TODO
7149 case EXPR_COMPOUND_LITERAL: return false;
7151 case EXPR_UNARY_NEGATE: return false;
7152 case EXPR_UNARY_PLUS: return false;
7153 case EXPR_UNARY_BITWISE_NEGATE: return false;
7154 case EXPR_UNARY_NOT: return false;
7155 case EXPR_UNARY_DEREFERENCE: return false;
7156 case EXPR_UNARY_TAKE_ADDRESS: return false;
7157 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
7158 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
7159 case EXPR_UNARY_PREFIX_INCREMENT: return true;
7160 case EXPR_UNARY_PREFIX_DECREMENT: return true;
7162 /* Treat void casts as if they have an effect in order to being able to
7163 * suppress the warning */
7164 case EXPR_UNARY_CAST: {
7165 type_t *const type = skip_typeref(expr->base.type);
7166 return is_type_atomic(type, ATOMIC_TYPE_VOID);
7169 case EXPR_UNARY_CAST_IMPLICIT: return true;
7170 case EXPR_UNARY_ASSUME: return true;
7172 case EXPR_BINARY_ADD: return false;
7173 case EXPR_BINARY_SUB: return false;
7174 case EXPR_BINARY_MUL: return false;
7175 case EXPR_BINARY_DIV: return false;
7176 case EXPR_BINARY_MOD: return false;
7177 case EXPR_BINARY_EQUAL: return false;
7178 case EXPR_BINARY_NOTEQUAL: return false;
7179 case EXPR_BINARY_LESS: return false;
7180 case EXPR_BINARY_LESSEQUAL: return false;
7181 case EXPR_BINARY_GREATER: return false;
7182 case EXPR_BINARY_GREATEREQUAL: return false;
7183 case EXPR_BINARY_BITWISE_AND: return false;
7184 case EXPR_BINARY_BITWISE_OR: return false;
7185 case EXPR_BINARY_BITWISE_XOR: return false;
7186 case EXPR_BINARY_SHIFTLEFT: return false;
7187 case EXPR_BINARY_SHIFTRIGHT: return false;
7188 case EXPR_BINARY_ASSIGN: return true;
7189 case EXPR_BINARY_MUL_ASSIGN: return true;
7190 case EXPR_BINARY_DIV_ASSIGN: return true;
7191 case EXPR_BINARY_MOD_ASSIGN: return true;
7192 case EXPR_BINARY_ADD_ASSIGN: return true;
7193 case EXPR_BINARY_SUB_ASSIGN: return true;
7194 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
7195 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
7196 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
7197 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
7198 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
7200 /* Only examine the right hand side of && and ||, because the left hand
7201 * side already has the effect of controlling the execution of the right
7203 case EXPR_BINARY_LOGICAL_AND:
7204 case EXPR_BINARY_LOGICAL_OR:
7205 /* Only examine the right hand side of a comma expression, because the left
7206 * hand side has a separate warning */
7207 case EXPR_BINARY_COMMA:
7208 return expression_has_effect(expr->binary.right);
7210 case EXPR_BINARY_BUILTIN_EXPECT: return true;
7211 case EXPR_BINARY_ISGREATER: return false;
7212 case EXPR_BINARY_ISGREATEREQUAL: return false;
7213 case EXPR_BINARY_ISLESS: return false;
7214 case EXPR_BINARY_ISLESSEQUAL: return false;
7215 case EXPR_BINARY_ISLESSGREATER: return false;
7216 case EXPR_BINARY_ISUNORDERED: return false;
7219 internal_errorf(HERE, "unexpected expression");
7222 static void semantic_comma(binary_expression_t *expression)
7224 if (warning.unused_value) {
7225 const expression_t *const left = expression->left;
7226 if (!expression_has_effect(left)) {
7227 warningf(&left->base.source_position,
7228 "left-hand operand of comma expression has no effect");
7231 expression->base.type = expression->right->base.type;
7234 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
7235 static expression_t *parse_##binexpression_type(unsigned precedence, \
7236 expression_t *left) \
7239 source_position_t pos = *HERE; \
7241 expression_t *right = parse_sub_expression(precedence + lr); \
7243 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
7244 binexpr->base.source_position = pos; \
7245 binexpr->binary.left = left; \
7246 binexpr->binary.right = right; \
7247 sfunc(&binexpr->binary); \
7252 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
7253 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
7254 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
7255 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
7256 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
7257 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
7258 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
7259 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
7260 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
7262 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
7263 semantic_comparison, 1)
7264 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
7265 semantic_comparison, 1)
7266 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
7267 semantic_comparison, 1)
7268 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
7269 semantic_comparison, 1)
7271 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
7272 semantic_binexpr_arithmetic, 1)
7273 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
7274 semantic_binexpr_arithmetic, 1)
7275 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
7276 semantic_binexpr_arithmetic, 1)
7277 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
7278 semantic_logical_op, 1)
7279 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
7280 semantic_logical_op, 1)
7281 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
7282 semantic_shift_op, 1)
7283 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
7284 semantic_shift_op, 1)
7285 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
7286 semantic_arithmetic_addsubb_assign, 0)
7287 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
7288 semantic_arithmetic_addsubb_assign, 0)
7289 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
7290 semantic_arithmetic_assign, 0)
7291 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
7292 semantic_arithmetic_assign, 0)
7293 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
7294 semantic_arithmetic_assign, 0)
7295 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
7296 semantic_arithmetic_assign, 0)
7297 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7298 semantic_arithmetic_assign, 0)
7299 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
7300 semantic_arithmetic_assign, 0)
7301 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
7302 semantic_arithmetic_assign, 0)
7303 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
7304 semantic_arithmetic_assign, 0)
7306 static expression_t *parse_sub_expression(unsigned precedence)
7308 if (token.type < 0) {
7309 return expected_expression_error();
7312 expression_parser_function_t *parser
7313 = &expression_parsers[token.type];
7314 source_position_t source_position = token.source_position;
7317 if (parser->parser != NULL) {
7318 left = parser->parser(parser->precedence);
7320 left = parse_primary_expression();
7322 assert(left != NULL);
7323 left->base.source_position = source_position;
7326 if (token.type < 0) {
7327 return expected_expression_error();
7330 parser = &expression_parsers[token.type];
7331 if (parser->infix_parser == NULL)
7333 if (parser->infix_precedence < precedence)
7336 left = parser->infix_parser(parser->infix_precedence, left);
7338 assert(left != NULL);
7339 assert(left->kind != EXPR_UNKNOWN);
7340 left->base.source_position = source_position;
7347 * Parse an expression.
7349 static expression_t *parse_expression(void)
7351 return parse_sub_expression(1);
7355 * Register a parser for a prefix-like operator with given precedence.
7357 * @param parser the parser function
7358 * @param token_type the token type of the prefix token
7359 * @param precedence the precedence of the operator
7361 static void register_expression_parser(parse_expression_function parser,
7362 int token_type, unsigned precedence)
7364 expression_parser_function_t *entry = &expression_parsers[token_type];
7366 if (entry->parser != NULL) {
7367 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7368 panic("trying to register multiple expression parsers for a token");
7370 entry->parser = parser;
7371 entry->precedence = precedence;
7375 * Register a parser for an infix operator with given precedence.
7377 * @param parser the parser function
7378 * @param token_type the token type of the infix operator
7379 * @param precedence the precedence of the operator
7381 static void register_infix_parser(parse_expression_infix_function parser,
7382 int token_type, unsigned precedence)
7384 expression_parser_function_t *entry = &expression_parsers[token_type];
7386 if (entry->infix_parser != NULL) {
7387 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7388 panic("trying to register multiple infix expression parsers for a "
7391 entry->infix_parser = parser;
7392 entry->infix_precedence = precedence;
7396 * Initialize the expression parsers.
7398 static void init_expression_parsers(void)
7400 memset(&expression_parsers, 0, sizeof(expression_parsers));
7402 register_infix_parser(parse_array_expression, '[', 30);
7403 register_infix_parser(parse_call_expression, '(', 30);
7404 register_infix_parser(parse_select_expression, '.', 30);
7405 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
7406 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
7408 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
7411 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
7412 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
7413 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
7414 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
7415 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
7416 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
7417 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
7418 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
7419 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
7420 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
7421 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
7422 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
7423 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
7424 T_EXCLAMATIONMARKEQUAL, 13);
7425 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
7426 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
7427 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
7428 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
7429 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
7430 register_infix_parser(parse_conditional_expression, '?', 7);
7431 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
7432 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
7433 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
7434 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
7435 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
7436 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
7437 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
7438 T_LESSLESSEQUAL, 2);
7439 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7440 T_GREATERGREATEREQUAL, 2);
7441 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
7443 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
7445 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
7448 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
7450 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
7451 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
7452 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
7453 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
7454 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
7455 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
7456 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
7458 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
7460 register_expression_parser(parse_sizeof, T_sizeof, 25);
7461 register_expression_parser(parse_alignof, T___alignof__, 25);
7462 register_expression_parser(parse_extension, T___extension__, 25);
7463 register_expression_parser(parse_builtin_classify_type,
7464 T___builtin_classify_type, 25);
7468 * Parse a asm statement arguments specification.
7470 static asm_argument_t *parse_asm_arguments(bool is_out)
7472 asm_argument_t *result = NULL;
7473 asm_argument_t *last = NULL;
7475 while (token.type == T_STRING_LITERAL || token.type == '[') {
7476 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7477 memset(argument, 0, sizeof(argument[0]));
7479 if (token.type == '[') {
7481 if (token.type != T_IDENTIFIER) {
7482 parse_error_expected("while parsing asm argument",
7483 T_IDENTIFIER, NULL);
7486 argument->symbol = token.v.symbol;
7491 argument->constraints = parse_string_literals();
7493 add_anchor_token(')');
7494 expression_t *expression = parse_expression();
7495 rem_anchor_token(')');
7497 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
7498 * change size or type representation (e.g. int -> long is ok, but
7499 * int -> float is not) */
7500 if (expression->kind == EXPR_UNARY_CAST) {
7501 type_t *const type = expression->base.type;
7502 type_kind_t const kind = type->kind;
7503 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
7506 if (kind == TYPE_ATOMIC) {
7507 atomic_type_kind_t const akind = type->atomic.akind;
7508 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
7509 size = get_atomic_type_size(akind);
7511 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
7512 size = get_atomic_type_size(get_intptr_kind());
7516 expression_t *const value = expression->unary.value;
7517 type_t *const value_type = value->base.type;
7518 type_kind_t const value_kind = value_type->kind;
7520 unsigned value_flags;
7521 unsigned value_size;
7522 if (value_kind == TYPE_ATOMIC) {
7523 atomic_type_kind_t const value_akind = value_type->atomic.akind;
7524 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
7525 value_size = get_atomic_type_size(value_akind);
7526 } else if (value_kind == TYPE_POINTER) {
7527 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
7528 value_size = get_atomic_type_size(get_intptr_kind());
7533 if (value_flags != flags || value_size != size)
7537 } while (expression->kind == EXPR_UNARY_CAST);
7541 if (!is_lvalue(expression)) {
7542 errorf(&expression->base.source_position,
7543 "asm output argument is not an lvalue");
7546 argument->expression = expression;
7549 set_address_taken(expression, true);
7552 last->next = argument;
7558 if (token.type != ',')
7569 * Parse a asm statement clobber specification.
7571 static asm_clobber_t *parse_asm_clobbers(void)
7573 asm_clobber_t *result = NULL;
7574 asm_clobber_t *last = NULL;
7576 while(token.type == T_STRING_LITERAL) {
7577 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
7578 clobber->clobber = parse_string_literals();
7581 last->next = clobber;
7587 if (token.type != ',')
7596 * Parse an asm statement.
7598 static statement_t *parse_asm_statement(void)
7602 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7603 statement->base.source_position = token.source_position;
7605 asm_statement_t *asm_statement = &statement->asms;
7607 if (token.type == T_volatile) {
7609 asm_statement->is_volatile = true;
7613 add_anchor_token(')');
7614 add_anchor_token(':');
7615 asm_statement->asm_text = parse_string_literals();
7617 if (token.type != ':') {
7618 rem_anchor_token(':');
7623 asm_statement->outputs = parse_asm_arguments(true);
7624 if (token.type != ':') {
7625 rem_anchor_token(':');
7630 asm_statement->inputs = parse_asm_arguments(false);
7631 if (token.type != ':') {
7632 rem_anchor_token(':');
7635 rem_anchor_token(':');
7638 asm_statement->clobbers = parse_asm_clobbers();
7641 rem_anchor_token(')');
7645 if (asm_statement->outputs == NULL) {
7646 /* GCC: An 'asm' instruction without any output operands will be treated
7647 * identically to a volatile 'asm' instruction. */
7648 asm_statement->is_volatile = true;
7653 return create_invalid_statement();
7657 * Parse a case statement.
7659 static statement_t *parse_case_statement(void)
7663 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7665 statement->base.source_position = token.source_position;
7666 statement->case_label.expression = parse_expression();
7668 if (c_mode & _GNUC) {
7669 if (token.type == T_DOTDOTDOT) {
7671 statement->case_label.end_range = parse_expression();
7677 if (! is_constant_expression(statement->case_label.expression)) {
7678 errorf(&statement->base.source_position,
7679 "case label does not reduce to an integer constant");
7681 /* TODO: check if the case label is already known */
7682 if (current_switch != NULL) {
7683 /* link all cases into the switch statement */
7684 if (current_switch->last_case == NULL) {
7685 current_switch->first_case =
7686 current_switch->last_case = &statement->case_label;
7688 current_switch->last_case->next = &statement->case_label;
7691 errorf(&statement->base.source_position,
7692 "case label not within a switch statement");
7695 statement->case_label.statement = parse_statement();
7699 return create_invalid_statement();
7703 * Finds an existing default label of a switch statement.
7705 static case_label_statement_t *
7706 find_default_label(const switch_statement_t *statement)
7708 case_label_statement_t *label = statement->first_case;
7709 for ( ; label != NULL; label = label->next) {
7710 if (label->expression == NULL)
7717 * Parse a default statement.
7719 static statement_t *parse_default_statement(void)
7723 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7725 statement->base.source_position = token.source_position;
7728 if (current_switch != NULL) {
7729 const case_label_statement_t *def_label = find_default_label(current_switch);
7730 if (def_label != NULL) {
7731 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7732 &def_label->base.source_position);
7734 /* link all cases into the switch statement */
7735 if (current_switch->last_case == NULL) {
7736 current_switch->first_case =
7737 current_switch->last_case = &statement->case_label;
7739 current_switch->last_case->next = &statement->case_label;
7743 errorf(&statement->base.source_position,
7744 "'default' label not within a switch statement");
7746 statement->case_label.statement = parse_statement();
7750 return create_invalid_statement();
7754 * Return the declaration for a given label symbol or create a new one.
7756 * @param symbol the symbol of the label
7758 static declaration_t *get_label(symbol_t *symbol)
7760 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7761 assert(current_function != NULL);
7762 /* if we found a label in the same function, then we already created the
7764 if (candidate != NULL
7765 && candidate->parent_scope == ¤t_function->scope) {
7769 /* otherwise we need to create a new one */
7770 declaration_t *const declaration = allocate_declaration_zero();
7771 declaration->namespc = NAMESPACE_LABEL;
7772 declaration->symbol = symbol;
7774 label_push(declaration);
7780 * Parse a label statement.
7782 static statement_t *parse_label_statement(void)
7784 assert(token.type == T_IDENTIFIER);
7785 symbol_t *symbol = token.v.symbol;
7788 declaration_t *label = get_label(symbol);
7790 /* if source position is already set then the label is defined twice,
7791 * otherwise it was just mentioned in a goto so far */
7792 if (label->source_position.input_name != NULL) {
7793 errorf(HERE, "duplicate label '%Y' (declared %P)",
7794 symbol, &label->source_position);
7796 label->source_position = token.source_position;
7799 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7801 statement->base.source_position = token.source_position;
7802 statement->label.label = label;
7806 if (token.type == '}') {
7807 /* TODO only warn? */
7809 warningf(HERE, "label at end of compound statement");
7810 statement->label.statement = create_empty_statement();
7812 errorf(HERE, "label at end of compound statement");
7813 statement->label.statement = create_invalid_statement();
7815 } else if (token.type == ';') {
7816 /* Eat an empty statement here, to avoid the warning about an empty
7817 * statement after a label. label:; is commonly used to have a label
7818 * before a closing brace. */
7819 statement->label.statement = create_empty_statement();
7822 statement->label.statement = parse_statement();
7825 /* remember the labels in a list for later checking */
7826 if (label_last == NULL) {
7827 label_first = &statement->label;
7829 label_last->next = &statement->label;
7831 label_last = &statement->label;
7837 * Parse an if statement.
7839 static statement_t *parse_if(void)
7843 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7844 statement->base.source_position = token.source_position;
7847 add_anchor_token(')');
7848 statement->ifs.condition = parse_expression();
7849 rem_anchor_token(')');
7852 add_anchor_token(T_else);
7853 statement->ifs.true_statement = parse_statement();
7854 rem_anchor_token(T_else);
7856 if (token.type == T_else) {
7858 statement->ifs.false_statement = parse_statement();
7863 return create_invalid_statement();
7867 * Parse a switch statement.
7869 static statement_t *parse_switch(void)
7873 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7874 statement->base.source_position = token.source_position;
7877 expression_t *const expr = parse_expression();
7878 type_t * type = skip_typeref(expr->base.type);
7879 if (is_type_integer(type)) {
7880 type = promote_integer(type);
7881 } else if (is_type_valid(type)) {
7882 errorf(&expr->base.source_position,
7883 "switch quantity is not an integer, but '%T'", type);
7884 type = type_error_type;
7886 statement->switchs.expression = create_implicit_cast(expr, type);
7889 switch_statement_t *rem = current_switch;
7890 current_switch = &statement->switchs;
7891 statement->switchs.body = parse_statement();
7892 current_switch = rem;
7894 if (warning.switch_default &&
7895 find_default_label(&statement->switchs) == NULL) {
7896 warningf(&statement->base.source_position, "switch has no default case");
7901 return create_invalid_statement();
7904 static statement_t *parse_loop_body(statement_t *const loop)
7906 statement_t *const rem = current_loop;
7907 current_loop = loop;
7909 statement_t *const body = parse_statement();
7916 * Parse a while statement.
7918 static statement_t *parse_while(void)
7922 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7923 statement->base.source_position = token.source_position;
7926 add_anchor_token(')');
7927 statement->whiles.condition = parse_expression();
7928 rem_anchor_token(')');
7931 statement->whiles.body = parse_loop_body(statement);
7935 return create_invalid_statement();
7939 * Parse a do statement.
7941 static statement_t *parse_do(void)
7945 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7947 statement->base.source_position = token.source_position;
7949 add_anchor_token(T_while);
7950 statement->do_while.body = parse_loop_body(statement);
7951 rem_anchor_token(T_while);
7955 add_anchor_token(')');
7956 statement->do_while.condition = parse_expression();
7957 rem_anchor_token(')');
7963 return create_invalid_statement();
7967 * Parse a for statement.
7969 static statement_t *parse_for(void)
7973 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7974 statement->base.source_position = token.source_position;
7976 int top = environment_top();
7977 scope_t *last_scope = scope;
7978 set_scope(&statement->fors.scope);
7981 add_anchor_token(')');
7983 if (token.type != ';') {
7984 if (is_declaration_specifier(&token, false)) {
7985 parse_declaration(record_declaration);
7987 add_anchor_token(';');
7988 expression_t *const init = parse_expression();
7989 statement->fors.initialisation = init;
7990 if (warning.unused_value && !expression_has_effect(init)) {
7991 warningf(&init->base.source_position,
7992 "initialisation of 'for'-statement has no effect");
7994 rem_anchor_token(';');
8001 if (token.type != ';') {
8002 add_anchor_token(';');
8003 statement->fors.condition = parse_expression();
8004 rem_anchor_token(';');
8007 if (token.type != ')') {
8008 expression_t *const step = parse_expression();
8009 statement->fors.step = step;
8010 if (warning.unused_value && !expression_has_effect(step)) {
8011 warningf(&step->base.source_position,
8012 "step of 'for'-statement has no effect");
8015 rem_anchor_token(')');
8017 statement->fors.body = parse_loop_body(statement);
8019 assert(scope == &statement->fors.scope);
8020 set_scope(last_scope);
8021 environment_pop_to(top);
8026 rem_anchor_token(')');
8027 assert(scope == &statement->fors.scope);
8028 set_scope(last_scope);
8029 environment_pop_to(top);
8031 return create_invalid_statement();
8035 * Parse a goto statement.
8037 static statement_t *parse_goto(void)
8041 if (token.type != T_IDENTIFIER) {
8042 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
8046 symbol_t *symbol = token.v.symbol;
8049 declaration_t *label = get_label(symbol);
8051 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
8052 statement->base.source_position = token.source_position;
8054 statement->gotos.label = label;
8056 /* remember the goto's in a list for later checking */
8057 if (goto_last == NULL) {
8058 goto_first = &statement->gotos;
8060 goto_last->next = &statement->gotos;
8062 goto_last = &statement->gotos;
8068 return create_invalid_statement();
8072 * Parse a continue statement.
8074 static statement_t *parse_continue(void)
8076 statement_t *statement;
8077 if (current_loop == NULL) {
8078 errorf(HERE, "continue statement not within loop");
8079 statement = create_invalid_statement();
8081 statement = allocate_statement_zero(STATEMENT_CONTINUE);
8083 statement->base.source_position = token.source_position;
8091 return create_invalid_statement();
8095 * Parse a break statement.
8097 static statement_t *parse_break(void)
8099 statement_t *statement;
8100 if (current_switch == NULL && current_loop == NULL) {
8101 errorf(HERE, "break statement not within loop or switch");
8102 statement = create_invalid_statement();
8104 statement = allocate_statement_zero(STATEMENT_BREAK);
8106 statement->base.source_position = token.source_position;
8114 return create_invalid_statement();
8118 * Parse a __leave statement.
8120 static statement_t *parse_leave(void)
8122 statement_t *statement;
8123 if (current_try == NULL) {
8124 errorf(HERE, "__leave statement not within __try");
8125 statement = create_invalid_statement();
8127 statement = allocate_statement_zero(STATEMENT_LEAVE);
8129 statement->base.source_position = token.source_position;
8137 return create_invalid_statement();
8141 * Check if a given declaration represents a local variable.
8143 static bool is_local_var_declaration(const declaration_t *declaration)
8145 switch ((storage_class_tag_t) declaration->storage_class) {
8146 case STORAGE_CLASS_AUTO:
8147 case STORAGE_CLASS_REGISTER: {
8148 const type_t *type = skip_typeref(declaration->type);
8149 if (is_type_function(type)) {
8161 * Check if a given declaration represents a variable.
8163 static bool is_var_declaration(const declaration_t *declaration)
8165 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
8168 const type_t *type = skip_typeref(declaration->type);
8169 return !is_type_function(type);
8173 * Check if a given expression represents a local variable.
8175 static bool is_local_variable(const expression_t *expression)
8177 if (expression->base.kind != EXPR_REFERENCE) {
8180 const declaration_t *declaration = expression->reference.declaration;
8181 return is_local_var_declaration(declaration);
8185 * Check if a given expression represents a local variable and
8186 * return its declaration then, else return NULL.
8188 declaration_t *expr_is_variable(const expression_t *expression)
8190 if (expression->base.kind != EXPR_REFERENCE) {
8193 declaration_t *declaration = expression->reference.declaration;
8194 if (is_var_declaration(declaration))
8200 * Parse a return statement.
8202 static statement_t *parse_return(void)
8204 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
8205 statement->base.source_position = token.source_position;
8209 expression_t *return_value = NULL;
8210 if (token.type != ';') {
8211 return_value = parse_expression();
8215 const type_t *const func_type = current_function->type;
8216 assert(is_type_function(func_type));
8217 type_t *const return_type = skip_typeref(func_type->function.return_type);
8219 if (return_value != NULL) {
8220 type_t *return_value_type = skip_typeref(return_value->base.type);
8222 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
8223 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
8224 warningf(&statement->base.source_position,
8225 "'return' with a value, in function returning void");
8226 return_value = NULL;
8228 assign_error_t error = semantic_assign(return_type, return_value);
8229 report_assign_error(error, return_type, return_value, "'return'",
8230 &statement->base.source_position);
8231 return_value = create_implicit_cast(return_value, return_type);
8233 /* check for returning address of a local var */
8234 if (return_value != NULL &&
8235 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
8236 const expression_t *expression = return_value->unary.value;
8237 if (is_local_variable(expression)) {
8238 warningf(&statement->base.source_position,
8239 "function returns address of local variable");
8243 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
8244 warningf(&statement->base.source_position,
8245 "'return' without value, in function returning non-void");
8248 statement->returns.value = return_value;
8252 return create_invalid_statement();
8256 * Parse a declaration statement.
8258 static statement_t *parse_declaration_statement(void)
8260 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
8262 statement->base.source_position = token.source_position;
8264 declaration_t *before = last_declaration;
8265 parse_declaration(record_declaration);
8267 if (before == NULL) {
8268 statement->declaration.declarations_begin = scope->declarations;
8270 statement->declaration.declarations_begin = before->next;
8272 statement->declaration.declarations_end = last_declaration;
8278 * Parse an expression statement, ie. expr ';'.
8280 static statement_t *parse_expression_statement(void)
8282 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
8284 statement->base.source_position = token.source_position;
8285 expression_t *const expr = parse_expression();
8286 statement->expression.expression = expr;
8292 return create_invalid_statement();
8296 * Parse a microsoft __try { } __finally { } or
8297 * __try{ } __except() { }
8299 static statement_t *parse_ms_try_statment(void)
8301 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
8303 statement->base.source_position = token.source_position;
8306 ms_try_statement_t *rem = current_try;
8307 current_try = &statement->ms_try;
8308 statement->ms_try.try_statement = parse_compound_statement(false);
8311 if (token.type == T___except) {
8314 add_anchor_token(')');
8315 expression_t *const expr = parse_expression();
8316 type_t * type = skip_typeref(expr->base.type);
8317 if (is_type_integer(type)) {
8318 type = promote_integer(type);
8319 } else if (is_type_valid(type)) {
8320 errorf(&expr->base.source_position,
8321 "__expect expression is not an integer, but '%T'", type);
8322 type = type_error_type;
8324 statement->ms_try.except_expression = create_implicit_cast(expr, type);
8325 rem_anchor_token(')');
8327 statement->ms_try.final_statement = parse_compound_statement(false);
8328 } else if (token.type == T__finally) {
8330 statement->ms_try.final_statement = parse_compound_statement(false);
8332 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
8333 return create_invalid_statement();
8337 return create_invalid_statement();
8340 static statement_t *parse_empty_statement(void)
8342 if (warning.empty_statement) {
8343 warningf(HERE, "statement is empty");
8346 return create_empty_statement();
8350 * Parse a statement.
8351 * There's also parse_statement() which additionally checks for
8352 * "statement has no effect" warnings
8354 static statement_t *intern_parse_statement(void)
8356 statement_t *statement = NULL;
8358 /* declaration or statement */
8359 add_anchor_token(';');
8360 switch (token.type) {
8362 if (look_ahead(1)->type == ':') {
8363 statement = parse_label_statement();
8364 } else if (is_typedef_symbol(token.v.symbol)) {
8365 statement = parse_declaration_statement();
8367 statement = parse_expression_statement();
8371 case T___extension__:
8372 /* This can be a prefix to a declaration or an expression statement.
8373 * We simply eat it now and parse the rest with tail recursion. */
8376 } while (token.type == T___extension__);
8377 statement = parse_statement();
8381 statement = parse_declaration_statement();
8384 case ';': statement = parse_empty_statement(); break;
8385 case '{': statement = parse_compound_statement(false); break;
8386 case T___leave: statement = parse_leave(); break;
8387 case T___try: statement = parse_ms_try_statment(); break;
8388 case T_asm: statement = parse_asm_statement(); break;
8389 case T_break: statement = parse_break(); break;
8390 case T_case: statement = parse_case_statement(); break;
8391 case T_continue: statement = parse_continue(); break;
8392 case T_default: statement = parse_default_statement(); break;
8393 case T_do: statement = parse_do(); break;
8394 case T_for: statement = parse_for(); break;
8395 case T_goto: statement = parse_goto(); break;
8396 case T_if: statement = parse_if (); break;
8397 case T_return: statement = parse_return(); break;
8398 case T_switch: statement = parse_switch(); break;
8399 case T_while: statement = parse_while(); break;
8400 default: statement = parse_expression_statement(); break;
8402 rem_anchor_token(';');
8404 assert(statement != NULL
8405 && statement->base.source_position.input_name != NULL);
8411 * parse a statement and emits "statement has no effect" warning if needed
8412 * (This is really a wrapper around intern_parse_statement with check for 1
8413 * single warning. It is needed, because for statement expressions we have
8414 * to avoid the warning on the last statement)
8416 static statement_t *parse_statement(void)
8418 statement_t *statement = intern_parse_statement();
8420 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
8421 expression_t *expression = statement->expression.expression;
8422 if (!expression_has_effect(expression)) {
8423 warningf(&expression->base.source_position,
8424 "statement has no effect");
8432 * Parse a compound statement.
8434 static statement_t *parse_compound_statement(bool inside_expression_statement)
8436 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
8438 statement->base.source_position = token.source_position;
8441 add_anchor_token('}');
8443 int top = environment_top();
8444 scope_t *last_scope = scope;
8445 set_scope(&statement->compound.scope);
8447 statement_t *last_statement = NULL;
8449 while (token.type != '}' && token.type != T_EOF) {
8450 statement_t *sub_statement = intern_parse_statement();
8451 if (is_invalid_statement(sub_statement)) {
8452 /* an error occurred. if we are at an anchor, return */
8458 if (last_statement != NULL) {
8459 last_statement->base.next = sub_statement;
8461 statement->compound.statements = sub_statement;
8464 while (sub_statement->base.next != NULL)
8465 sub_statement = sub_statement->base.next;
8467 last_statement = sub_statement;
8470 if (token.type == '}') {
8473 errorf(&statement->base.source_position,
8474 "end of file while looking for closing '}'");
8477 /* look over all statements again to produce no effect warnings */
8478 if (warning.unused_value) {
8479 statement_t *sub_statement = statement->compound.statements;
8480 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
8481 if (sub_statement->kind != STATEMENT_EXPRESSION)
8483 /* don't emit a warning for the last expression in an expression
8484 * statement as it has always an effect */
8485 if (inside_expression_statement && sub_statement->base.next == NULL)
8488 expression_t *expression = sub_statement->expression.expression;
8489 if (!expression_has_effect(expression)) {
8490 warningf(&expression->base.source_position,
8491 "statement has no effect");
8497 rem_anchor_token('}');
8498 assert(scope == &statement->compound.scope);
8499 set_scope(last_scope);
8500 environment_pop_to(top);
8506 * Initialize builtin types.
8508 static void initialize_builtin_types(void)
8510 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
8511 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
8512 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
8513 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
8514 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
8515 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
8516 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
8517 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
8519 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
8520 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
8521 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
8522 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
8526 * Check for unused global static functions and variables
8528 static void check_unused_globals(void)
8530 if (!warning.unused_function && !warning.unused_variable)
8533 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
8535 decl->modifiers & DM_UNUSED ||
8536 decl->modifiers & DM_USED ||
8537 decl->storage_class != STORAGE_CLASS_STATIC)
8540 type_t *const type = decl->type;
8542 if (is_type_function(skip_typeref(type))) {
8543 if (!warning.unused_function || decl->is_inline)
8546 s = (decl->init.statement != NULL ? "defined" : "declared");
8548 if (!warning.unused_variable)
8554 warningf(&decl->source_position, "'%#T' %s but not used",
8555 type, decl->symbol, s);
8559 static void parse_global_asm(void)
8564 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8565 statement->base.source_position = token.source_position;
8566 statement->asms.asm_text = parse_string_literals();
8567 statement->base.next = unit->global_asm;
8568 unit->global_asm = statement;
8577 * Parse a translation unit.
8579 static void parse_translation_unit(void)
8581 for (;;) switch (token.type) {
8584 case T___extension__:
8585 parse_external_declaration();
8596 /* TODO error in strict mode */
8597 warningf(HERE, "stray ';' outside of function");
8602 errorf(HERE, "stray %K outside of function", &token);
8603 if (token.type == '(' || token.type == '{' || token.type == '[')
8604 eat_until_matching_token(token.type);
8613 * @return the translation unit or NULL if errors occurred.
8615 void start_parsing(void)
8617 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8618 label_stack = NEW_ARR_F(stack_entry_t, 0);
8619 diagnostic_count = 0;
8623 type_set_output(stderr);
8624 ast_set_output(stderr);
8626 assert(unit == NULL);
8627 unit = allocate_ast_zero(sizeof(unit[0]));
8629 assert(global_scope == NULL);
8630 global_scope = &unit->scope;
8632 assert(scope == NULL);
8633 set_scope(&unit->scope);
8635 initialize_builtin_types();
8638 translation_unit_t *finish_parsing(void)
8640 assert(scope == &unit->scope);
8642 last_declaration = NULL;
8644 assert(global_scope == &unit->scope);
8645 check_unused_globals();
8646 global_scope = NULL;
8648 DEL_ARR_F(environment_stack);
8649 DEL_ARR_F(label_stack);
8651 translation_unit_t *result = unit;
8658 lookahead_bufpos = 0;
8659 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8662 parse_translation_unit();
8666 * Initialize the parser.
8668 void init_parser(void)
8671 /* add predefined symbols for extended-decl-modifier */
8672 sym_align = symbol_table_insert("align");
8673 sym_allocate = symbol_table_insert("allocate");
8674 sym_dllimport = symbol_table_insert("dllimport");
8675 sym_dllexport = symbol_table_insert("dllexport");
8676 sym_naked = symbol_table_insert("naked");
8677 sym_noinline = symbol_table_insert("noinline");
8678 sym_noreturn = symbol_table_insert("noreturn");
8679 sym_nothrow = symbol_table_insert("nothrow");
8680 sym_novtable = symbol_table_insert("novtable");
8681 sym_property = symbol_table_insert("property");
8682 sym_get = symbol_table_insert("get");
8683 sym_put = symbol_table_insert("put");
8684 sym_selectany = symbol_table_insert("selectany");
8685 sym_thread = symbol_table_insert("thread");
8686 sym_uuid = symbol_table_insert("uuid");
8687 sym_deprecated = symbol_table_insert("deprecated");
8688 sym_restrict = symbol_table_insert("restrict");
8689 sym_noalias = symbol_table_insert("noalias");
8691 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8693 init_expression_parsers();
8694 obstack_init(&temp_obst);
8696 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8697 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8701 * Terminate the parser.
8703 void exit_parser(void)
8705 obstack_free(&temp_obst, NULL);