2 * This file is part of cparser.
3 * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27 #include "diagnostic.h"
28 #include "format_check.h"
34 #include "type_hash.h"
36 #include "lang_features.h"
38 #include "adt/bitfiddle.h"
39 #include "adt/error.h"
40 #include "adt/array.h"
42 //#define PRINT_TOKENS
43 #define MAX_LOOKAHEAD 2
46 declaration_t *old_declaration;
48 unsigned short namespc;
51 typedef struct gnu_attribute_t gnu_attribute_t;
52 struct gnu_attribute_t {
53 gnu_attribute_kind_t kind;
54 gnu_attribute_t *next;
60 atomic_type_kind_t akind;
64 typedef struct declaration_specifiers_t declaration_specifiers_t;
65 struct declaration_specifiers_t {
66 source_position_t source_position;
67 unsigned char declared_storage_class;
68 unsigned char alignment; /**< Alignment, 0 if not set. */
69 unsigned int is_inline : 1;
70 unsigned int deprecated : 1;
71 decl_modifiers_t modifiers; /**< declaration modifiers */
72 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
73 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
74 symbol_t *get_property_sym; /**< the name of the get property if set. */
75 symbol_t *put_property_sym; /**< the name of the put property if set. */
80 * An environment for parsing initializers (and compound literals).
82 typedef struct parse_initializer_env_t {
83 type_t *type; /**< the type of the initializer. In case of an
84 array type with unspecified size this gets
85 adjusted to the actual size. */
86 declaration_t *declaration; /**< the declaration that is initialized if any */
87 bool must_be_constant;
88 } parse_initializer_env_t;
90 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
93 static token_t lookahead_buffer[MAX_LOOKAHEAD];
94 static int lookahead_bufpos;
95 static stack_entry_t *environment_stack = NULL;
96 static stack_entry_t *label_stack = NULL;
97 static scope_t *global_scope = NULL;
98 static scope_t *scope = NULL;
99 static declaration_t *last_declaration = NULL;
100 static declaration_t *current_function = NULL;
101 static switch_statement_t *current_switch = NULL;
102 static statement_t *current_loop = NULL;
103 static ms_try_statement_t *current_try = NULL;
104 static goto_statement_t *goto_first = NULL;
105 static goto_statement_t *goto_last = NULL;
106 static label_statement_t *label_first = NULL;
107 static label_statement_t *label_last = NULL;
108 static translation_unit_t *unit = NULL;
109 static struct obstack temp_obst;
111 static source_position_t null_position = { NULL, 0 };
113 /* symbols for Microsoft extended-decl-modifier */
114 static const symbol_t *sym_align = NULL;
115 static const symbol_t *sym_allocate = NULL;
116 static const symbol_t *sym_dllimport = NULL;
117 static const symbol_t *sym_dllexport = NULL;
118 static const symbol_t *sym_naked = NULL;
119 static const symbol_t *sym_noinline = NULL;
120 static const symbol_t *sym_noreturn = NULL;
121 static const symbol_t *sym_nothrow = NULL;
122 static const symbol_t *sym_novtable = NULL;
123 static const symbol_t *sym_property = NULL;
124 static const symbol_t *sym_get = NULL;
125 static const symbol_t *sym_put = NULL;
126 static const symbol_t *sym_selectany = NULL;
127 static const symbol_t *sym_thread = NULL;
128 static const symbol_t *sym_uuid = NULL;
129 static const symbol_t *sym_deprecated = NULL;
130 static const symbol_t *sym_restrict = NULL;
131 static const symbol_t *sym_noalias = NULL;
133 /** The token anchor set */
134 static unsigned char token_anchor_set[T_LAST_TOKEN];
136 /** The current source position. */
137 #define HERE (&token.source_position)
139 static type_t *type_valist;
141 static statement_t *parse_compound_statement(bool inside_expression_statement);
142 static statement_t *parse_statement(void);
144 static expression_t *parse_sub_expression(unsigned precedence);
145 static expression_t *parse_expression(void);
146 static type_t *parse_typename(void);
148 static void parse_compound_type_entries(declaration_t *compound_declaration);
149 static declaration_t *parse_declarator(
150 const declaration_specifiers_t *specifiers, bool may_be_abstract);
151 static declaration_t *record_declaration(declaration_t *declaration);
153 static void semantic_comparison(binary_expression_t *expression);
155 #define STORAGE_CLASSES \
162 #define TYPE_QUALIFIERS \
167 case T__forceinline: \
168 case T___attribute__:
170 #ifdef PROVIDE_COMPLEX
171 #define COMPLEX_SPECIFIERS \
173 #define IMAGINARY_SPECIFIERS \
176 #define COMPLEX_SPECIFIERS
177 #define IMAGINARY_SPECIFIERS
180 #define TYPE_SPECIFIERS \
195 case T___builtin_va_list: \
200 #define DECLARATION_START \
205 #define TYPENAME_START \
210 * Allocate an AST node with given size and
211 * initialize all fields with zero.
213 static void *allocate_ast_zero(size_t size)
215 void *res = allocate_ast(size);
216 memset(res, 0, size);
220 static declaration_t *allocate_declaration_zero(void)
222 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
223 declaration->type = type_error_type;
224 declaration->alignment = 0;
229 * Returns the size of a statement node.
231 * @param kind the statement kind
233 static size_t get_statement_struct_size(statement_kind_t kind)
235 static const size_t sizes[] = {
236 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
237 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
238 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
239 [STATEMENT_RETURN] = sizeof(return_statement_t),
240 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
241 [STATEMENT_IF] = sizeof(if_statement_t),
242 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
243 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
244 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
245 [STATEMENT_BREAK] = sizeof(statement_base_t),
246 [STATEMENT_GOTO] = sizeof(goto_statement_t),
247 [STATEMENT_LABEL] = sizeof(label_statement_t),
248 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
249 [STATEMENT_WHILE] = sizeof(while_statement_t),
250 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
251 [STATEMENT_FOR] = sizeof(for_statement_t),
252 [STATEMENT_ASM] = sizeof(asm_statement_t),
253 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
254 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
256 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
257 assert(sizes[kind] != 0);
262 * Returns the size of an expression node.
264 * @param kind the expression kind
266 static size_t get_expression_struct_size(expression_kind_t kind)
268 static const size_t sizes[] = {
269 [EXPR_INVALID] = sizeof(expression_base_t),
270 [EXPR_REFERENCE] = sizeof(reference_expression_t),
271 [EXPR_CONST] = sizeof(const_expression_t),
272 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
273 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
274 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
275 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
276 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
277 [EXPR_CALL] = sizeof(call_expression_t),
278 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
279 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
280 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
281 [EXPR_SELECT] = sizeof(select_expression_t),
282 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
283 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
284 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
285 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
286 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
287 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
288 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
289 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
290 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
291 [EXPR_VA_START] = sizeof(va_start_expression_t),
292 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
293 [EXPR_STATEMENT] = sizeof(statement_expression_t),
295 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
296 return sizes[EXPR_UNARY_FIRST];
298 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
299 return sizes[EXPR_BINARY_FIRST];
301 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
302 assert(sizes[kind] != 0);
307 * Allocate a statement node of given kind and initialize all
310 static statement_t *allocate_statement_zero(statement_kind_t kind)
312 size_t size = get_statement_struct_size(kind);
313 statement_t *res = allocate_ast_zero(size);
315 res->base.kind = kind;
320 * Allocate an expression node of given kind and initialize all
323 static expression_t *allocate_expression_zero(expression_kind_t kind)
325 size_t size = get_expression_struct_size(kind);
326 expression_t *res = allocate_ast_zero(size);
328 res->base.kind = kind;
329 res->base.type = type_error_type;
334 * Creates a new invalid expression.
336 static expression_t *create_invalid_expression(void)
338 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
339 expression->base.source_position = token.source_position;
344 * Creates a new invalid statement.
346 static statement_t *create_invalid_statement(void)
348 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
349 statement->base.source_position = token.source_position;
354 * Allocate a new empty statement.
356 static statement_t *create_empty_statement(void)
358 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
359 statement->base.source_position = token.source_position;
364 * Returns the size of a type node.
366 * @param kind the type kind
368 static size_t get_type_struct_size(type_kind_t kind)
370 static const size_t sizes[] = {
371 [TYPE_ATOMIC] = sizeof(atomic_type_t),
372 [TYPE_COMPLEX] = sizeof(complex_type_t),
373 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
374 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
375 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
376 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
377 [TYPE_ENUM] = sizeof(enum_type_t),
378 [TYPE_FUNCTION] = sizeof(function_type_t),
379 [TYPE_POINTER] = sizeof(pointer_type_t),
380 [TYPE_ARRAY] = sizeof(array_type_t),
381 [TYPE_BUILTIN] = sizeof(builtin_type_t),
382 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
383 [TYPE_TYPEOF] = sizeof(typeof_type_t),
385 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
386 assert(kind <= TYPE_TYPEOF);
387 assert(sizes[kind] != 0);
392 * Allocate a type node of given kind and initialize all
395 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
397 size_t size = get_type_struct_size(kind);
398 type_t *res = obstack_alloc(type_obst, size);
399 memset(res, 0, size);
401 res->base.kind = kind;
402 res->base.source_position = *source_position;
407 * Returns the size of an initializer node.
409 * @param kind the initializer kind
411 static size_t get_initializer_size(initializer_kind_t kind)
413 static const size_t sizes[] = {
414 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
415 [INITIALIZER_STRING] = sizeof(initializer_string_t),
416 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
417 [INITIALIZER_LIST] = sizeof(initializer_list_t),
418 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
420 assert(kind < sizeof(sizes) / sizeof(*sizes));
421 assert(sizes[kind] != 0);
426 * Allocate an initializer node of given kind and initialize all
429 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
431 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
438 * Free a type from the type obstack.
440 static void free_type(void *type)
442 obstack_free(type_obst, type);
446 * Returns the index of the top element of the environment stack.
448 static size_t environment_top(void)
450 return ARR_LEN(environment_stack);
454 * Returns the index of the top element of the label stack.
456 static size_t label_top(void)
458 return ARR_LEN(label_stack);
462 * Return the next token.
464 static inline void next_token(void)
466 token = lookahead_buffer[lookahead_bufpos];
467 lookahead_buffer[lookahead_bufpos] = lexer_token;
470 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
473 print_token(stderr, &token);
474 fprintf(stderr, "\n");
479 * Return the next token with a given lookahead.
481 static inline const token_t *look_ahead(int num)
483 assert(num > 0 && num <= MAX_LOOKAHEAD);
484 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
485 return &lookahead_buffer[pos];
489 * Adds a token to the token anchor set (a multi-set).
491 static void add_anchor_token(int token_type) {
492 assert(0 <= token_type && token_type < T_LAST_TOKEN);
493 ++token_anchor_set[token_type];
496 static int save_and_reset_anchor_state(int token_type) {
497 assert(0 <= token_type && token_type < T_LAST_TOKEN);
498 int count = token_anchor_set[token_type];
499 token_anchor_set[token_type] = 0;
503 static void restore_anchor_state(int token_type, int count) {
504 assert(0 <= token_type && token_type < T_LAST_TOKEN);
505 token_anchor_set[token_type] = count;
509 * Remove a token from the token anchor set (a multi-set).
511 static void rem_anchor_token(int token_type) {
512 assert(0 <= token_type && token_type < T_LAST_TOKEN);
513 --token_anchor_set[token_type];
516 static bool at_anchor(void) {
519 return token_anchor_set[token.type];
523 * Eat tokens until a matching token is found.
525 static void eat_until_matching_token(int type) {
526 unsigned parenthesis_count = 0;
527 unsigned brace_count = 0;
528 unsigned bracket_count = 0;
529 int end_token = type;
533 else if (type == '{')
535 else if (type == '[')
538 while(token.type != end_token ||
539 (parenthesis_count > 0 || brace_count > 0 || bracket_count > 0)) {
543 case '(': ++parenthesis_count; break;
544 case '{': ++brace_count; break;
545 case '[': ++bracket_count; break;
547 if (parenthesis_count > 0)
555 if (bracket_count > 0)
566 * Eat input tokens until an anchor is found.
568 static void eat_until_anchor(void) {
569 if (token.type == T_EOF)
571 while(token_anchor_set[token.type] == 0) {
572 if (token.type == '(' || token.type == '{' || token.type == '[')
573 eat_until_matching_token(token.type);
574 if (token.type == T_EOF)
580 static void eat_block(void) {
581 eat_until_matching_token('{');
582 if (token.type == '}')
587 * eat all token until a ';' is reached or a stop token is found.
589 static void eat_statement(void) {
590 eat_until_matching_token(';');
591 if (token.type == ';')
595 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
598 * Report a parse error because an expected token was not found.
601 #if defined __GNUC__ && __GNUC__ >= 4
602 __attribute__((sentinel))
604 void parse_error_expected(const char *message, ...)
606 if (message != NULL) {
607 errorf(HERE, "%s", message);
610 va_start(ap, message);
611 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
616 * Report a type error.
618 static void type_error(const char *msg, const source_position_t *source_position,
621 errorf(source_position, "%s, but found type '%T'", msg, type);
625 * Report an incompatible type.
627 static void type_error_incompatible(const char *msg,
628 const source_position_t *source_position, type_t *type1, type_t *type2)
630 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
635 * Expect the the current token is the expected token.
636 * If not, generate an error, eat the current statement,
637 * and goto the end_error label.
639 #define expect(expected) \
641 if (UNLIKELY(token.type != (expected))) { \
642 parse_error_expected(NULL, (expected), NULL); \
643 add_anchor_token(expected); \
644 eat_until_anchor(); \
645 if (token.type == expected) \
647 rem_anchor_token(expected); \
653 static void set_scope(scope_t *new_scope)
656 scope->last_declaration = last_declaration;
660 last_declaration = new_scope->last_declaration;
664 * Search a symbol in a given namespace and returns its declaration or
665 * NULL if this symbol was not found.
667 static declaration_t *get_declaration(const symbol_t *const symbol,
668 const namespace_t namespc)
670 declaration_t *declaration = symbol->declaration;
671 for( ; declaration != NULL; declaration = declaration->symbol_next) {
672 if (declaration->namespc == namespc)
680 * pushs an environment_entry on the environment stack and links the
681 * corresponding symbol to the new entry
683 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
685 symbol_t *symbol = declaration->symbol;
686 namespace_t namespc = (namespace_t) declaration->namespc;
688 /* replace/add declaration into declaration list of the symbol */
689 declaration_t *iter = symbol->declaration;
691 symbol->declaration = declaration;
693 declaration_t *iter_last = NULL;
694 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
695 /* replace an entry? */
696 if (iter->namespc == namespc) {
697 if (iter_last == NULL) {
698 symbol->declaration = declaration;
700 iter_last->symbol_next = declaration;
702 declaration->symbol_next = iter->symbol_next;
707 assert(iter_last->symbol_next == NULL);
708 iter_last->symbol_next = declaration;
712 /* remember old declaration */
714 entry.symbol = symbol;
715 entry.old_declaration = iter;
716 entry.namespc = (unsigned short) namespc;
717 ARR_APP1(stack_entry_t, *stack_ptr, entry);
720 static void environment_push(declaration_t *declaration)
722 assert(declaration->source_position.input_name != NULL);
723 assert(declaration->parent_scope != NULL);
724 stack_push(&environment_stack, declaration);
727 static void label_push(declaration_t *declaration)
729 declaration->parent_scope = ¤t_function->scope;
730 stack_push(&label_stack, declaration);
734 * pops symbols from the environment stack until @p new_top is the top element
736 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
738 stack_entry_t *stack = *stack_ptr;
739 size_t top = ARR_LEN(stack);
742 assert(new_top <= top);
746 for(i = top; i > new_top; --i) {
747 stack_entry_t *entry = &stack[i - 1];
749 declaration_t *old_declaration = entry->old_declaration;
750 symbol_t *symbol = entry->symbol;
751 namespace_t namespc = (namespace_t)entry->namespc;
753 /* replace/remove declaration */
754 declaration_t *declaration = symbol->declaration;
755 assert(declaration != NULL);
756 if (declaration->namespc == namespc) {
757 if (old_declaration == NULL) {
758 symbol->declaration = declaration->symbol_next;
760 symbol->declaration = old_declaration;
763 declaration_t *iter_last = declaration;
764 declaration_t *iter = declaration->symbol_next;
765 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
766 /* replace an entry? */
767 if (iter->namespc == namespc) {
768 assert(iter_last != NULL);
769 iter_last->symbol_next = old_declaration;
770 if (old_declaration != NULL) {
771 old_declaration->symbol_next = iter->symbol_next;
776 assert(iter != NULL);
780 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
783 static void environment_pop_to(size_t new_top)
785 stack_pop_to(&environment_stack, new_top);
788 static void label_pop_to(size_t new_top)
790 stack_pop_to(&label_stack, new_top);
794 static int get_rank(const type_t *type)
796 assert(!is_typeref(type));
797 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
798 * and esp. footnote 108). However we can't fold constants (yet), so we
799 * can't decide whether unsigned int is possible, while int always works.
800 * (unsigned int would be preferable when possible... for stuff like
801 * struct { enum { ... } bla : 4; } ) */
802 if (type->kind == TYPE_ENUM)
803 return ATOMIC_TYPE_INT;
805 assert(type->kind == TYPE_ATOMIC);
806 return type->atomic.akind;
809 static type_t *promote_integer(type_t *type)
811 if (type->kind == TYPE_BITFIELD)
812 type = type->bitfield.base_type;
814 if (get_rank(type) < ATOMIC_TYPE_INT)
821 * Create a cast expression.
823 * @param expression the expression to cast
824 * @param dest_type the destination type
826 static expression_t *create_cast_expression(expression_t *expression,
829 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
831 cast->unary.value = expression;
832 cast->base.type = dest_type;
838 * Check if a given expression represents the 0 pointer constant.
840 static bool is_null_pointer_constant(const expression_t *expression)
842 /* skip void* cast */
843 if (expression->kind == EXPR_UNARY_CAST
844 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
845 expression = expression->unary.value;
848 /* TODO: not correct yet, should be any constant integer expression
849 * which evaluates to 0 */
850 if (expression->kind != EXPR_CONST)
853 type_t *const type = skip_typeref(expression->base.type);
854 if (!is_type_integer(type))
857 return expression->conste.v.int_value == 0;
861 * Create an implicit cast expression.
863 * @param expression the expression to cast
864 * @param dest_type the destination type
866 static expression_t *create_implicit_cast(expression_t *expression,
869 type_t *const source_type = expression->base.type;
871 if (source_type == dest_type)
874 return create_cast_expression(expression, dest_type);
877 typedef enum assign_error_t {
879 ASSIGN_ERROR_INCOMPATIBLE,
880 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
881 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
882 ASSIGN_WARNING_POINTER_FROM_INT,
883 ASSIGN_WARNING_INT_FROM_POINTER
886 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
887 const expression_t *const right,
889 const source_position_t *source_position)
891 type_t *const orig_type_right = right->base.type;
892 type_t *const type_left = skip_typeref(orig_type_left);
893 type_t *const type_right = skip_typeref(orig_type_right);
898 case ASSIGN_ERROR_INCOMPATIBLE:
899 errorf(source_position,
900 "destination type '%T' in %s is incompatible with type '%T'",
901 orig_type_left, context, orig_type_right);
904 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
905 type_t *points_to_left
906 = skip_typeref(type_left->pointer.points_to);
907 type_t *points_to_right
908 = skip_typeref(type_right->pointer.points_to);
910 /* the left type has all qualifiers from the right type */
911 unsigned missing_qualifiers
912 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
913 errorf(source_position,
914 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type",
915 orig_type_left, context, orig_type_right, missing_qualifiers);
919 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
920 warningf(source_position,
921 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
922 orig_type_left, context, right, orig_type_right);
925 case ASSIGN_WARNING_POINTER_FROM_INT:
926 warningf(source_position,
927 "%s makes integer '%T' from pointer '%T' without a cast",
928 context, orig_type_left, orig_type_right);
931 case ASSIGN_WARNING_INT_FROM_POINTER:
932 warningf(source_position,
933 "%s makes integer '%T' from pointer '%T' without a cast",
934 context, orig_type_left, orig_type_right);
938 panic("invalid error value");
942 /** Implements the rules from § 6.5.16.1 */
943 static assign_error_t semantic_assign(type_t *orig_type_left,
944 const expression_t *const right)
946 type_t *const orig_type_right = right->base.type;
947 type_t *const type_left = skip_typeref(orig_type_left);
948 type_t *const type_right = skip_typeref(orig_type_right);
950 if (is_type_pointer(type_left)) {
951 if (is_null_pointer_constant(right)) {
952 return ASSIGN_SUCCESS;
953 } else if (is_type_pointer(type_right)) {
954 type_t *points_to_left
955 = skip_typeref(type_left->pointer.points_to);
956 type_t *points_to_right
957 = skip_typeref(type_right->pointer.points_to);
959 /* the left type has all qualifiers from the right type */
960 unsigned missing_qualifiers
961 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
962 if (missing_qualifiers != 0) {
963 return ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
966 points_to_left = get_unqualified_type(points_to_left);
967 points_to_right = get_unqualified_type(points_to_right);
969 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
970 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
971 return ASSIGN_SUCCESS;
974 if (!types_compatible(points_to_left, points_to_right)) {
975 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
978 return ASSIGN_SUCCESS;
979 } else if (is_type_integer(type_right)) {
980 return ASSIGN_WARNING_POINTER_FROM_INT;
982 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
983 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
984 && is_type_pointer(type_right))) {
985 return ASSIGN_SUCCESS;
986 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
987 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
988 type_t *const unqual_type_left = get_unqualified_type(type_left);
989 type_t *const unqual_type_right = get_unqualified_type(type_right);
990 if (types_compatible(unqual_type_left, unqual_type_right)) {
991 return ASSIGN_SUCCESS;
993 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
994 return ASSIGN_WARNING_INT_FROM_POINTER;
997 if (!is_type_valid(type_left) || !is_type_valid(type_right))
998 return ASSIGN_SUCCESS;
1000 return ASSIGN_ERROR_INCOMPATIBLE;
1003 static expression_t *parse_constant_expression(void)
1005 /* start parsing at precedence 7 (conditional expression) */
1006 expression_t *result = parse_sub_expression(7);
1008 if (!is_constant_expression(result)) {
1009 errorf(&result->base.source_position,
1010 "expression '%E' is not constant\n", result);
1016 static expression_t *parse_assignment_expression(void)
1018 /* start parsing at precedence 2 (assignment expression) */
1019 return parse_sub_expression(2);
1022 static type_t *make_global_typedef(const char *name, type_t *type)
1024 symbol_t *const symbol = symbol_table_insert(name);
1026 declaration_t *const declaration = allocate_declaration_zero();
1027 declaration->namespc = NAMESPACE_NORMAL;
1028 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
1029 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1030 declaration->type = type;
1031 declaration->symbol = symbol;
1032 declaration->source_position = builtin_source_position;
1034 record_declaration(declaration);
1036 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1037 typedef_type->typedeft.declaration = declaration;
1039 return typedef_type;
1042 static string_t parse_string_literals(void)
1044 assert(token.type == T_STRING_LITERAL);
1045 string_t result = token.v.string;
1049 while (token.type == T_STRING_LITERAL) {
1050 result = concat_strings(&result, &token.v.string);
1057 static const char *gnu_attribute_names[GNU_AK_LAST] = {
1058 [GNU_AK_CONST] = "const",
1059 [GNU_AK_VOLATILE] = "volatile",
1060 [GNU_AK_CDECL] = "cdecl",
1061 [GNU_AK_STDCALL] = "stdcall",
1062 [GNU_AK_FASTCALL] = "fastcall",
1063 [GNU_AK_DEPRECATED] = "deprecated",
1064 [GNU_AK_NOINLINE] = "noinline",
1065 [GNU_AK_NORETURN] = "noreturn",
1066 [GNU_AK_NAKED] = "naked",
1067 [GNU_AK_PURE] = "pure",
1068 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1069 [GNU_AK_MALLOC] = "malloc",
1070 [GNU_AK_WEAK] = "weak",
1071 [GNU_AK_CONSTRUCTOR] = "constructor",
1072 [GNU_AK_DESTRUCTOR] = "destructor",
1073 [GNU_AK_NOTHROW] = "nothrow",
1074 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1075 [GNU_AK_COMMON] = "common",
1076 [GNU_AK_NOCOMMON] = "nocommon",
1077 [GNU_AK_PACKED] = "packed",
1078 [GNU_AK_SHARED] = "shared",
1079 [GNU_AK_NOTSHARED] = "notshared",
1080 [GNU_AK_USED] = "used",
1081 [GNU_AK_UNUSED] = "unused",
1082 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1083 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1084 [GNU_AK_LONGCALL] = "longcall",
1085 [GNU_AK_SHORTCALL] = "shortcall",
1086 [GNU_AK_LONG_CALL] = "long_call",
1087 [GNU_AK_SHORT_CALL] = "short_call",
1088 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1089 [GNU_AK_INTERRUPT] = "interrupt",
1090 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1091 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1092 [GNU_AK_NESTING] = "nesting",
1093 [GNU_AK_NEAR] = "near",
1094 [GNU_AK_FAR] = "far",
1095 [GNU_AK_SIGNAL] = "signal",
1096 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1097 [GNU_AK_TINY_DATA] = "tiny_data",
1098 [GNU_AK_SAVEALL] = "saveall",
1099 [GNU_AK_FLATTEN] = "flatten",
1100 [GNU_AK_SSEREGPARM] = "sseregparm",
1101 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1102 [GNU_AK_RETURN_TWICE] = "return_twice",
1103 [GNU_AK_MAY_ALIAS] = "may_alias",
1104 [GNU_AK_MS_STRUCT] = "ms_struct",
1105 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1106 [GNU_AK_DLLIMPORT] = "dllimport",
1107 [GNU_AK_DLLEXPORT] = "dllexport",
1108 [GNU_AK_ALIGNED] = "aligned",
1109 [GNU_AK_ALIAS] = "alias",
1110 [GNU_AK_SECTION] = "section",
1111 [GNU_AK_FORMAT] = "format",
1112 [GNU_AK_FORMAT_ARG] = "format_arg",
1113 [GNU_AK_WEAKREF] = "weakref",
1114 [GNU_AK_NONNULL] = "nonnull",
1115 [GNU_AK_TLS_MODEL] = "tls_model",
1116 [GNU_AK_VISIBILITY] = "visibility",
1117 [GNU_AK_REGPARM] = "regparm",
1118 [GNU_AK_MODE] = "mode",
1119 [GNU_AK_MODEL] = "model",
1120 [GNU_AK_TRAP_EXIT] = "trap_exit",
1121 [GNU_AK_SP_SWITCH] = "sp_switch",
1122 [GNU_AK_SENTINEL] = "sentinel"
1126 * compare two string, ignoring double underscores on the second.
1128 static int strcmp_underscore(const char *s1, const char *s2) {
1129 if (s2[0] == '_' && s2[1] == '_') {
1130 size_t len2 = strlen(s2);
1131 size_t len1 = strlen(s1);
1132 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1133 return strncmp(s1, s2+2, len2-4);
1137 return strcmp(s1, s2);
1141 * Allocate a new gnu temporal attribute.
1143 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind) {
1144 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1145 attribute->kind = kind;
1146 attribute->next = NULL;
1147 attribute->invalid = false;
1148 attribute->have_arguments = false;
1154 * parse one constant expression argument.
1156 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute) {
1157 expression_t *expression;
1158 add_anchor_token(')');
1159 expression = parse_constant_expression();
1160 rem_anchor_token(')');
1165 attribute->invalid = true;
1169 * parse a list of constant expressions arguments.
1171 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute) {
1172 expression_t *expression;
1173 add_anchor_token(')');
1174 add_anchor_token(',');
1176 expression = parse_constant_expression();
1177 if (token.type != ',')
1181 rem_anchor_token(',');
1182 rem_anchor_token(')');
1187 attribute->invalid = true;
1191 * parse one string literal argument.
1193 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1196 add_anchor_token('(');
1197 if (token.type != T_STRING_LITERAL) {
1198 parse_error_expected("while parsing attribute directive",
1199 T_STRING_LITERAL, NULL);
1202 *string = parse_string_literals();
1203 rem_anchor_token('(');
1207 attribute->invalid = true;
1211 * parse one tls model.
1213 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute) {
1214 static const char *tls_models[] = {
1220 string_t string = { NULL, 0 };
1221 parse_gnu_attribute_string_arg(attribute, &string);
1222 if (string.begin != NULL) {
1223 for(size_t i = 0; i < 4; ++i) {
1224 if (strcmp(tls_models[i], string.begin) == 0) {
1225 attribute->u.value = i;
1229 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1231 attribute->invalid = true;
1235 * parse one tls model.
1237 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute) {
1238 static const char *visibilities[] = {
1244 string_t string = { NULL, 0 };
1245 parse_gnu_attribute_string_arg(attribute, &string);
1246 if (string.begin != NULL) {
1247 for(size_t i = 0; i < 4; ++i) {
1248 if (strcmp(visibilities[i], string.begin) == 0) {
1249 attribute->u.value = i;
1253 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1255 attribute->invalid = true;
1259 * parse one (code) model.
1261 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute) {
1262 static const char *visibilities[] = {
1267 string_t string = { NULL, 0 };
1268 parse_gnu_attribute_string_arg(attribute, &string);
1269 if (string.begin != NULL) {
1270 for(int i = 0; i < 3; ++i) {
1271 if (strcmp(visibilities[i], string.begin) == 0) {
1272 attribute->u.value = i;
1276 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1278 attribute->invalid = true;
1281 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1283 /* TODO: find out what is allowed here... */
1285 /* at least: byte, word, pointer, list of machine modes
1286 * __XXX___ is interpreted as XXX */
1287 add_anchor_token(')');
1289 if (token.type != T_IDENTIFIER) {
1290 expect(T_IDENTIFIER);
1293 /* This isn't really correct, the backend should provide a list of machine
1294 * specific modes (according to gcc philosophy that is...) */
1295 const char *symbol_str = token.v.symbol->string;
1296 if(strcmp_underscore("QI", symbol_str) == 0) {
1297 attribute->u.akind = ATOMIC_TYPE_CHAR;
1298 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1299 attribute->u.akind = ATOMIC_TYPE_SHORT;
1300 } else if(strcmp_underscore("SI", symbol_str) == 0) {
1301 attribute->u.akind = ATOMIC_TYPE_INT;
1302 } else if(strcmp_underscore("DI", symbol_str) == 0) {
1303 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1305 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1306 attribute->invalid = true;
1310 rem_anchor_token(')');
1314 attribute->invalid = true;
1318 * parse one interrupt argument.
1320 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute) {
1321 static const char *interrupts[] = {
1328 string_t string = { NULL, 0 };
1329 parse_gnu_attribute_string_arg(attribute, &string);
1330 if (string.begin != NULL) {
1331 for(size_t i = 0; i < 5; ++i) {
1332 if (strcmp(interrupts[i], string.begin) == 0) {
1333 attribute->u.value = i;
1337 errorf(HERE, "'%s' is not an interrupt", string.begin);
1339 attribute->invalid = true;
1343 * parse ( identifier, const expression, const expression )
1345 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute) {
1346 static const char *format_names[] = {
1354 if (token.type != T_IDENTIFIER) {
1355 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1358 const char *name = token.v.symbol->string;
1359 for(i = 0; i < 4; ++i) {
1360 if (strcmp_underscore(format_names[i], name) == 0)
1364 if (warning.attribute)
1365 warningf(HERE, "'%s' is an unrecognized format function type", name);
1370 add_anchor_token(')');
1371 add_anchor_token(',');
1372 parse_constant_expression();
1373 rem_anchor_token(',');
1374 rem_anchor_token('(');
1377 add_anchor_token(')');
1378 parse_constant_expression();
1379 rem_anchor_token('(');
1383 attribute->u.value = true;
1386 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1388 if (!attribute->have_arguments)
1391 /* should have no arguments */
1392 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1393 eat_until_matching_token('(');
1394 /* we have already consumed '(', so we stop before ')', eat it */
1396 attribute->invalid = true;
1400 * Parse one GNU attribute.
1402 * Note that attribute names can be specified WITH or WITHOUT
1403 * double underscores, ie const or __const__.
1405 * The following attributes are parsed without arguments
1430 * no_instrument_function
1431 * warn_unused_result
1448 * externally_visible
1456 * The following attributes are parsed with arguments
1457 * aligned( const expression )
1458 * alias( string literal )
1459 * section( string literal )
1460 * format( identifier, const expression, const expression )
1461 * format_arg( const expression )
1462 * tls_model( string literal )
1463 * visibility( string literal )
1464 * regparm( const expression )
1465 * model( string leteral )
1466 * trap_exit( const expression )
1467 * sp_switch( string literal )
1469 * The following attributes might have arguments
1470 * weak_ref( string literal )
1471 * non_null( const expression // ',' )
1472 * interrupt( string literal )
1473 * sentinel( constant expression )
1475 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1477 gnu_attribute_t *head = *attributes;
1478 gnu_attribute_t *last = *attributes;
1479 decl_modifiers_t modifiers = 0;
1480 gnu_attribute_t *attribute;
1482 eat(T___attribute__);
1486 if (token.type != ')') {
1487 /* find the end of the list */
1489 while(last->next != NULL)
1493 /* non-empty attribute list */
1496 if (token.type == T_const) {
1498 } else if (token.type == T_volatile) {
1500 } else if (token.type == T_cdecl) {
1501 /* __attribute__((cdecl)), WITH ms mode */
1503 } else if (token.type == T_IDENTIFIER) {
1504 const symbol_t *sym = token.v.symbol;
1507 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1514 for(i = 0; i < GNU_AK_LAST; ++i) {
1515 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1518 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1521 if (kind == GNU_AK_LAST) {
1522 if (warning.attribute)
1523 warningf(HERE, "'%s' attribute directive ignored", name);
1525 /* skip possible arguments */
1526 if (token.type == '(') {
1527 eat_until_matching_token(')');
1530 /* check for arguments */
1531 attribute = allocate_gnu_attribute(kind);
1532 if (token.type == '(') {
1534 if (token.type == ')') {
1535 /* empty args are allowed */
1538 attribute->have_arguments = true;
1543 case GNU_AK_VOLATILE:
1545 case GNU_AK_STDCALL:
1546 case GNU_AK_FASTCALL:
1547 case GNU_AK_DEPRECATED:
1552 case GNU_AK_NOCOMMON:
1554 case GNU_AK_NOTSHARED:
1557 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1558 case GNU_AK_WARN_UNUSED_RESULT:
1559 case GNU_AK_LONGCALL:
1560 case GNU_AK_SHORTCALL:
1561 case GNU_AK_LONG_CALL:
1562 case GNU_AK_SHORT_CALL:
1563 case GNU_AK_FUNCTION_VECTOR:
1564 case GNU_AK_INTERRUPT_HANDLER:
1565 case GNU_AK_NMI_HANDLER:
1566 case GNU_AK_NESTING:
1570 case GNU_AK_EIGTHBIT_DATA:
1571 case GNU_AK_TINY_DATA:
1572 case GNU_AK_SAVEALL:
1573 case GNU_AK_FLATTEN:
1574 case GNU_AK_SSEREGPARM:
1575 case GNU_AK_EXTERNALLY_VISIBLE:
1576 case GNU_AK_RETURN_TWICE:
1577 case GNU_AK_MAY_ALIAS:
1578 case GNU_AK_MS_STRUCT:
1579 case GNU_AK_GCC_STRUCT:
1580 check_no_argument(attribute, name);
1584 check_no_argument(attribute, name);
1585 modifiers |= DM_PURE;
1588 case GNU_AK_ALWAYS_INLINE:
1589 check_no_argument(attribute, name);
1590 modifiers |= DM_FORCEINLINE;
1593 case GNU_AK_DLLIMPORT:
1594 check_no_argument(attribute, name);
1595 modifiers |= DM_DLLIMPORT;
1598 case GNU_AK_DLLEXPORT:
1599 check_no_argument(attribute, name);
1600 modifiers |= DM_DLLEXPORT;
1604 check_no_argument(attribute, name);
1605 modifiers |= DM_PACKED;
1608 case GNU_AK_NOINLINE:
1609 check_no_argument(attribute, name);
1610 modifiers |= DM_NOINLINE;
1613 case GNU_AK_NORETURN:
1614 check_no_argument(attribute, name);
1615 modifiers |= DM_NORETURN;
1618 case GNU_AK_NOTHROW:
1619 check_no_argument(attribute, name);
1620 modifiers |= DM_NOTHROW;
1623 case GNU_AK_TRANSPARENT_UNION:
1624 check_no_argument(attribute, name);
1625 modifiers |= DM_TRANSPARENT_UNION;
1628 case GNU_AK_CONSTRUCTOR:
1629 check_no_argument(attribute, name);
1630 modifiers |= DM_CONSTRUCTOR;
1633 case GNU_AK_DESTRUCTOR:
1634 check_no_argument(attribute, name);
1635 modifiers |= DM_DESTRUCTOR;
1638 case GNU_AK_ALIGNED:
1639 /* __align__ may be used without an argument */
1640 if (attribute->have_arguments) {
1641 parse_gnu_attribute_const_arg(attribute);
1645 case GNU_AK_FORMAT_ARG:
1646 case GNU_AK_REGPARM:
1647 case GNU_AK_TRAP_EXIT:
1648 if (!attribute->have_arguments) {
1649 /* should have arguments */
1650 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1651 attribute->invalid = true;
1653 parse_gnu_attribute_const_arg(attribute);
1656 case GNU_AK_SECTION:
1657 case GNU_AK_SP_SWITCH:
1658 if (!attribute->have_arguments) {
1659 /* should have arguments */
1660 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1661 attribute->invalid = true;
1663 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1666 if (!attribute->have_arguments) {
1667 /* should have arguments */
1668 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1669 attribute->invalid = true;
1671 parse_gnu_attribute_format_args(attribute);
1673 case GNU_AK_WEAKREF:
1674 /* may have one string argument */
1675 if (attribute->have_arguments)
1676 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1678 case GNU_AK_NONNULL:
1679 if (attribute->have_arguments)
1680 parse_gnu_attribute_const_arg_list(attribute);
1682 case GNU_AK_TLS_MODEL:
1683 if (!attribute->have_arguments) {
1684 /* should have arguments */
1685 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1687 parse_gnu_attribute_tls_model_arg(attribute);
1689 case GNU_AK_VISIBILITY:
1690 if (!attribute->have_arguments) {
1691 /* should have arguments */
1692 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1694 parse_gnu_attribute_visibility_arg(attribute);
1697 if (!attribute->have_arguments) {
1698 /* should have arguments */
1699 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1701 parse_gnu_attribute_model_arg(attribute);
1705 if (!attribute->have_arguments) {
1706 /* should have arguments */
1707 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1709 parse_gnu_attribute_mode_arg(attribute);
1712 case GNU_AK_INTERRUPT:
1713 /* may have one string argument */
1714 if (attribute->have_arguments)
1715 parse_gnu_attribute_interrupt_arg(attribute);
1717 case GNU_AK_SENTINEL:
1718 /* may have one string argument */
1719 if (attribute->have_arguments)
1720 parse_gnu_attribute_const_arg(attribute);
1723 /* already handled */
1727 if (attribute != NULL) {
1729 last->next = attribute;
1732 head = last = attribute;
1736 if (token.type != ',')
1750 * Parse GNU attributes.
1752 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1754 decl_modifiers_t modifiers = 0;
1757 switch(token.type) {
1758 case T___attribute__:
1759 modifiers |= parse_gnu_attribute(attributes);
1765 if (token.type != T_STRING_LITERAL) {
1766 parse_error_expected("while parsing assembler attribute",
1767 T_STRING_LITERAL, NULL);
1768 eat_until_matching_token('(');
1771 parse_string_literals();
1780 /* TODO record modifier */
1781 warningf(HERE, "Ignoring declaration modifier %K", &token);
1786 goto attributes_finished;
1790 attributes_finished:
1795 static designator_t *parse_designation(void)
1797 designator_t *result = NULL;
1798 designator_t *last = NULL;
1801 designator_t *designator;
1802 switch(token.type) {
1804 designator = allocate_ast_zero(sizeof(designator[0]));
1805 designator->source_position = token.source_position;
1807 add_anchor_token(']');
1808 designator->array_index = parse_constant_expression();
1809 rem_anchor_token(']');
1813 designator = allocate_ast_zero(sizeof(designator[0]));
1814 designator->source_position = token.source_position;
1816 if (token.type != T_IDENTIFIER) {
1817 parse_error_expected("while parsing designator",
1818 T_IDENTIFIER, NULL);
1821 designator->symbol = token.v.symbol;
1829 assert(designator != NULL);
1831 last->next = designator;
1833 result = designator;
1841 static initializer_t *initializer_from_string(array_type_t *type,
1842 const string_t *const string)
1844 /* TODO: check len vs. size of array type */
1847 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1848 initializer->string.string = *string;
1853 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1854 wide_string_t *const string)
1856 /* TODO: check len vs. size of array type */
1859 initializer_t *const initializer =
1860 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1861 initializer->wide_string.string = *string;
1867 * Build an initializer from a given expression.
1869 static initializer_t *initializer_from_expression(type_t *orig_type,
1870 expression_t *expression)
1872 /* TODO check that expression is a constant expression */
1874 /* § 6.7.8.14/15 char array may be initialized by string literals */
1875 type_t *type = skip_typeref(orig_type);
1876 type_t *expr_type_orig = expression->base.type;
1877 type_t *expr_type = skip_typeref(expr_type_orig);
1878 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1879 array_type_t *const array_type = &type->array;
1880 type_t *const element_type = skip_typeref(array_type->element_type);
1882 if (element_type->kind == TYPE_ATOMIC) {
1883 atomic_type_kind_t akind = element_type->atomic.akind;
1884 switch (expression->kind) {
1885 case EXPR_STRING_LITERAL:
1886 if (akind == ATOMIC_TYPE_CHAR
1887 || akind == ATOMIC_TYPE_SCHAR
1888 || akind == ATOMIC_TYPE_UCHAR) {
1889 return initializer_from_string(array_type,
1890 &expression->string.value);
1893 case EXPR_WIDE_STRING_LITERAL: {
1894 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1895 if (get_unqualified_type(element_type) == bare_wchar_type) {
1896 return initializer_from_wide_string(array_type,
1897 &expression->wide_string.value);
1907 assign_error_t error = semantic_assign(type, expression);
1908 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1910 report_assign_error(error, type, expression, "initializer",
1911 &expression->base.source_position);
1913 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1914 result->value.value = create_implicit_cast(expression, type);
1920 * Checks if a given expression can be used as an constant initializer.
1922 static bool is_initializer_constant(const expression_t *expression)
1924 return is_constant_expression(expression)
1925 || is_address_constant(expression);
1929 * Parses an scalar initializer.
1931 * § 6.7.8.11; eat {} without warning
1933 static initializer_t *parse_scalar_initializer(type_t *type,
1934 bool must_be_constant)
1936 /* there might be extra {} hierarchies */
1938 if (token.type == '{') {
1939 warningf(HERE, "extra curly braces around scalar initializer");
1943 } while (token.type == '{');
1946 expression_t *expression = parse_assignment_expression();
1947 if (must_be_constant && !is_initializer_constant(expression)) {
1948 errorf(&expression->base.source_position,
1949 "Initialisation expression '%E' is not constant\n",
1953 initializer_t *initializer = initializer_from_expression(type, expression);
1955 if (initializer == NULL) {
1956 errorf(&expression->base.source_position,
1957 "expression '%E' (type '%T') doesn't match expected type '%T'",
1958 expression, expression->base.type, type);
1963 bool additional_warning_displayed = false;
1965 if (token.type == ',') {
1968 if (token.type != '}') {
1969 if (!additional_warning_displayed) {
1970 warningf(HERE, "additional elements in scalar initializer");
1971 additional_warning_displayed = true;
1982 * An entry in the type path.
1984 typedef struct type_path_entry_t type_path_entry_t;
1985 struct type_path_entry_t {
1986 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
1988 size_t index; /**< For array types: the current index. */
1989 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1994 * A type path expression a position inside compound or array types.
1996 typedef struct type_path_t type_path_t;
1997 struct type_path_t {
1998 type_path_entry_t *path; /**< An flexible array containing the current path. */
1999 type_t *top_type; /**< type of the element the path points */
2000 size_t max_index; /**< largest index in outermost array */
2004 * Prints a type path for debugging.
2006 static __attribute__((unused)) void debug_print_type_path(
2007 const type_path_t *path)
2009 size_t len = ARR_LEN(path->path);
2011 for(size_t i = 0; i < len; ++i) {
2012 const type_path_entry_t *entry = & path->path[i];
2014 type_t *type = skip_typeref(entry->type);
2015 if (is_type_compound(type)) {
2016 /* in gcc mode structs can have no members */
2017 if (entry->v.compound_entry == NULL) {
2021 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2022 } else if (is_type_array(type)) {
2023 fprintf(stderr, "[%zd]", entry->v.index);
2025 fprintf(stderr, "-INVALID-");
2028 if (path->top_type != NULL) {
2029 fprintf(stderr, " (");
2030 print_type(path->top_type);
2031 fprintf(stderr, ")");
2036 * Return the top type path entry, ie. in a path
2037 * (type).a.b returns the b.
2039 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2041 size_t len = ARR_LEN(path->path);
2043 return &path->path[len-1];
2047 * Enlarge the type path by an (empty) element.
2049 static type_path_entry_t *append_to_type_path(type_path_t *path)
2051 size_t len = ARR_LEN(path->path);
2052 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2054 type_path_entry_t *result = & path->path[len];
2055 memset(result, 0, sizeof(result[0]));
2060 * Descending into a sub-type. Enter the scope of the current
2063 static void descend_into_subtype(type_path_t *path)
2065 type_t *orig_top_type = path->top_type;
2066 type_t *top_type = skip_typeref(orig_top_type);
2068 assert(is_type_compound(top_type) || is_type_array(top_type));
2070 type_path_entry_t *top = append_to_type_path(path);
2071 top->type = top_type;
2073 if (is_type_compound(top_type)) {
2074 declaration_t *declaration = top_type->compound.declaration;
2075 declaration_t *entry = declaration->scope.declarations;
2076 top->v.compound_entry = entry;
2078 if (entry != NULL) {
2079 path->top_type = entry->type;
2081 path->top_type = NULL;
2084 assert(is_type_array(top_type));
2087 path->top_type = top_type->array.element_type;
2092 * Pop an entry from the given type path, ie. returning from
2093 * (type).a.b to (type).a
2095 static void ascend_from_subtype(type_path_t *path)
2097 type_path_entry_t *top = get_type_path_top(path);
2099 path->top_type = top->type;
2101 size_t len = ARR_LEN(path->path);
2102 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2106 * Pop entries from the given type path until the given
2107 * path level is reached.
2109 static void ascend_to(type_path_t *path, size_t top_path_level)
2111 size_t len = ARR_LEN(path->path);
2113 while(len > top_path_level) {
2114 ascend_from_subtype(path);
2115 len = ARR_LEN(path->path);
2119 static bool walk_designator(type_path_t *path, const designator_t *designator,
2120 bool used_in_offsetof)
2122 for( ; designator != NULL; designator = designator->next) {
2123 type_path_entry_t *top = get_type_path_top(path);
2124 type_t *orig_type = top->type;
2126 type_t *type = skip_typeref(orig_type);
2128 if (designator->symbol != NULL) {
2129 symbol_t *symbol = designator->symbol;
2130 if (!is_type_compound(type)) {
2131 if (is_type_valid(type)) {
2132 errorf(&designator->source_position,
2133 "'.%Y' designator used for non-compound type '%T'",
2139 declaration_t *declaration = type->compound.declaration;
2140 declaration_t *iter = declaration->scope.declarations;
2141 for( ; iter != NULL; iter = iter->next) {
2142 if (iter->symbol == symbol) {
2147 errorf(&designator->source_position,
2148 "'%T' has no member named '%Y'", orig_type, symbol);
2151 if (used_in_offsetof) {
2152 type_t *real_type = skip_typeref(iter->type);
2153 if (real_type->kind == TYPE_BITFIELD) {
2154 errorf(&designator->source_position,
2155 "offsetof designator '%Y' may not specify bitfield",
2161 top->type = orig_type;
2162 top->v.compound_entry = iter;
2163 orig_type = iter->type;
2165 expression_t *array_index = designator->array_index;
2166 assert(designator->array_index != NULL);
2168 if (!is_type_array(type)) {
2169 if (is_type_valid(type)) {
2170 errorf(&designator->source_position,
2171 "[%E] designator used for non-array type '%T'",
2172 array_index, orig_type);
2176 if (!is_type_valid(array_index->base.type)) {
2180 long index = fold_constant(array_index);
2181 if (!used_in_offsetof) {
2183 errorf(&designator->source_position,
2184 "array index [%E] must be positive", array_index);
2187 if (type->array.size_constant == true) {
2188 long array_size = type->array.size;
2189 if (index >= array_size) {
2190 errorf(&designator->source_position,
2191 "designator [%E] (%d) exceeds array size %d",
2192 array_index, index, array_size);
2198 top->type = orig_type;
2199 top->v.index = (size_t) index;
2200 orig_type = type->array.element_type;
2202 path->top_type = orig_type;
2204 if (designator->next != NULL) {
2205 descend_into_subtype(path);
2214 static void advance_current_object(type_path_t *path, size_t top_path_level)
2216 type_path_entry_t *top = get_type_path_top(path);
2218 type_t *type = skip_typeref(top->type);
2219 if (is_type_union(type)) {
2220 /* in unions only the first element is initialized */
2221 top->v.compound_entry = NULL;
2222 } else if (is_type_struct(type)) {
2223 declaration_t *entry = top->v.compound_entry;
2225 entry = entry->next;
2226 top->v.compound_entry = entry;
2227 if (entry != NULL) {
2228 path->top_type = entry->type;
2232 assert(is_type_array(type));
2236 if (!type->array.size_constant || top->v.index < type->array.size) {
2241 /* we're past the last member of the current sub-aggregate, try if we
2242 * can ascend in the type hierarchy and continue with another subobject */
2243 size_t len = ARR_LEN(path->path);
2245 if (len > top_path_level) {
2246 ascend_from_subtype(path);
2247 advance_current_object(path, top_path_level);
2249 path->top_type = NULL;
2254 * skip until token is found.
2256 static void skip_until(int type) {
2257 while(token.type != type) {
2258 if (token.type == T_EOF)
2265 * skip any {...} blocks until a closing bracket is reached.
2267 static void skip_initializers(void)
2269 if (token.type == '{')
2272 while(token.type != '}') {
2273 if (token.type == T_EOF)
2275 if (token.type == '{') {
2283 static initializer_t *create_empty_initializer(void)
2285 static initializer_t empty_initializer
2286 = { .list = { { INITIALIZER_LIST }, 0 } };
2287 return &empty_initializer;
2291 * Parse a part of an initialiser for a struct or union,
2293 static initializer_t *parse_sub_initializer(type_path_t *path,
2294 type_t *outer_type, size_t top_path_level,
2295 parse_initializer_env_t *env)
2297 if (token.type == '}') {
2298 /* empty initializer */
2299 return create_empty_initializer();
2302 type_t *orig_type = path->top_type;
2303 type_t *type = NULL;
2305 if (orig_type == NULL) {
2306 /* We are initializing an empty compound. */
2308 type = skip_typeref(orig_type);
2310 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2311 * initializers in this case. */
2312 if (!is_type_valid(type)) {
2313 skip_initializers();
2314 return create_empty_initializer();
2318 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2321 designator_t *designator = NULL;
2322 if (token.type == '.' || token.type == '[') {
2323 designator = parse_designation();
2325 /* reset path to toplevel, evaluate designator from there */
2326 ascend_to(path, top_path_level);
2327 if (!walk_designator(path, designator, false)) {
2328 /* can't continue after designation error */
2332 initializer_t *designator_initializer
2333 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2334 designator_initializer->designator.designator = designator;
2335 ARR_APP1(initializer_t*, initializers, designator_initializer);
2337 orig_type = path->top_type;
2338 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2343 if (token.type == '{') {
2344 if (type != NULL && is_type_scalar(type)) {
2345 sub = parse_scalar_initializer(type, env->must_be_constant);
2349 if (env->declaration != NULL) {
2350 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2351 env->declaration->symbol);
2353 errorf(HERE, "extra brace group at end of initializer");
2356 descend_into_subtype(path);
2358 add_anchor_token('}');
2359 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2361 rem_anchor_token('}');
2364 ascend_from_subtype(path);
2368 goto error_parse_next;
2372 /* must be an expression */
2373 expression_t *expression = parse_assignment_expression();
2375 if (env->must_be_constant && !is_initializer_constant(expression)) {
2376 errorf(&expression->base.source_position,
2377 "Initialisation expression '%E' is not constant\n",
2382 /* we are already outside, ... */
2386 /* handle { "string" } special case */
2387 if ((expression->kind == EXPR_STRING_LITERAL
2388 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2389 && outer_type != NULL) {
2390 sub = initializer_from_expression(outer_type, expression);
2392 if (token.type == ',') {
2395 if (token.type != '}') {
2396 warningf(HERE, "excessive elements in initializer for type '%T'",
2399 /* TODO: eat , ... */
2404 /* descend into subtypes until expression matches type */
2406 orig_type = path->top_type;
2407 type = skip_typeref(orig_type);
2409 sub = initializer_from_expression(orig_type, expression);
2413 if (!is_type_valid(type)) {
2416 if (is_type_scalar(type)) {
2417 errorf(&expression->base.source_position,
2418 "expression '%E' doesn't match expected type '%T'",
2419 expression, orig_type);
2423 descend_into_subtype(path);
2427 /* update largest index of top array */
2428 const type_path_entry_t *first = &path->path[0];
2429 type_t *first_type = first->type;
2430 first_type = skip_typeref(first_type);
2431 if (is_type_array(first_type)) {
2432 size_t index = first->v.index;
2433 if (index > path->max_index)
2434 path->max_index = index;
2438 /* append to initializers list */
2439 ARR_APP1(initializer_t*, initializers, sub);
2442 if (env->declaration != NULL)
2443 warningf(HERE, "excess elements in struct initializer for '%Y'",
2444 env->declaration->symbol);
2446 warningf(HERE, "excess elements in struct initializer");
2450 if (token.type == '}') {
2454 if (token.type == '}') {
2459 /* advance to the next declaration if we are not at the end */
2460 advance_current_object(path, top_path_level);
2461 orig_type = path->top_type;
2462 if (orig_type != NULL)
2463 type = skip_typeref(orig_type);
2469 size_t len = ARR_LEN(initializers);
2470 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2471 initializer_t *result = allocate_ast_zero(size);
2472 result->kind = INITIALIZER_LIST;
2473 result->list.len = len;
2474 memcpy(&result->list.initializers, initializers,
2475 len * sizeof(initializers[0]));
2477 DEL_ARR_F(initializers);
2478 ascend_to(path, top_path_level+1);
2483 skip_initializers();
2484 DEL_ARR_F(initializers);
2485 ascend_to(path, top_path_level+1);
2490 * Parses an initializer. Parsers either a compound literal
2491 * (env->declaration == NULL) or an initializer of a declaration.
2493 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2495 type_t *type = skip_typeref(env->type);
2496 initializer_t *result = NULL;
2499 if (is_type_scalar(type)) {
2500 result = parse_scalar_initializer(type, env->must_be_constant);
2501 } else if (token.type == '{') {
2505 memset(&path, 0, sizeof(path));
2506 path.top_type = env->type;
2507 path.path = NEW_ARR_F(type_path_entry_t, 0);
2509 descend_into_subtype(&path);
2511 add_anchor_token('}');
2512 result = parse_sub_initializer(&path, env->type, 1, env);
2513 rem_anchor_token('}');
2515 max_index = path.max_index;
2516 DEL_ARR_F(path.path);
2520 /* parse_scalar_initializer() also works in this case: we simply
2521 * have an expression without {} around it */
2522 result = parse_scalar_initializer(type, env->must_be_constant);
2525 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2526 * the array type size */
2527 if (is_type_array(type) && type->array.size_expression == NULL
2528 && result != NULL) {
2530 switch (result->kind) {
2531 case INITIALIZER_LIST:
2532 size = max_index + 1;
2535 case INITIALIZER_STRING:
2536 size = result->string.string.size;
2539 case INITIALIZER_WIDE_STRING:
2540 size = result->wide_string.string.size;
2543 case INITIALIZER_DESIGNATOR:
2544 case INITIALIZER_VALUE:
2545 /* can happen for parse errors */
2550 internal_errorf(HERE, "invalid initializer type");
2553 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2554 cnst->base.type = type_size_t;
2555 cnst->conste.v.int_value = size;
2557 type_t *new_type = duplicate_type(type);
2559 new_type->array.size_expression = cnst;
2560 new_type->array.size_constant = true;
2561 new_type->array.size = size;
2562 env->type = new_type;
2570 static declaration_t *append_declaration(declaration_t *declaration);
2572 static declaration_t *parse_compound_type_specifier(bool is_struct)
2574 gnu_attribute_t *attributes = NULL;
2575 decl_modifiers_t modifiers = 0;
2582 symbol_t *symbol = NULL;
2583 declaration_t *declaration = NULL;
2585 if (token.type == T___attribute__) {
2586 modifiers |= parse_attributes(&attributes);
2589 if (token.type == T_IDENTIFIER) {
2590 symbol = token.v.symbol;
2594 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
2596 declaration = get_declaration(symbol, NAMESPACE_UNION);
2598 } else if (token.type != '{') {
2600 parse_error_expected("while parsing struct type specifier",
2601 T_IDENTIFIER, '{', NULL);
2603 parse_error_expected("while parsing union type specifier",
2604 T_IDENTIFIER, '{', NULL);
2610 if (declaration == NULL) {
2611 declaration = allocate_declaration_zero();
2612 declaration->namespc =
2613 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2614 declaration->source_position = token.source_position;
2615 declaration->symbol = symbol;
2616 declaration->parent_scope = scope;
2617 if (symbol != NULL) {
2618 environment_push(declaration);
2620 append_declaration(declaration);
2623 if (token.type == '{') {
2624 if (declaration->init.complete) {
2625 assert(symbol != NULL);
2626 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2627 is_struct ? "struct" : "union", symbol,
2628 &declaration->source_position);
2629 declaration->scope.declarations = NULL;
2631 declaration->init.complete = true;
2633 parse_compound_type_entries(declaration);
2634 modifiers |= parse_attributes(&attributes);
2637 declaration->modifiers |= modifiers;
2641 static void parse_enum_entries(type_t *const enum_type)
2645 if (token.type == '}') {
2647 errorf(HERE, "empty enum not allowed");
2651 add_anchor_token('}');
2653 if (token.type != T_IDENTIFIER) {
2654 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2656 rem_anchor_token('}');
2660 declaration_t *const entry = allocate_declaration_zero();
2661 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2662 entry->type = enum_type;
2663 entry->symbol = token.v.symbol;
2664 entry->source_position = token.source_position;
2667 if (token.type == '=') {
2669 expression_t *value = parse_constant_expression();
2671 value = create_implicit_cast(value, enum_type);
2672 entry->init.enum_value = value;
2677 record_declaration(entry);
2679 if (token.type != ',')
2682 } while(token.type != '}');
2683 rem_anchor_token('}');
2691 static type_t *parse_enum_specifier(void)
2693 gnu_attribute_t *attributes = NULL;
2694 declaration_t *declaration;
2698 if (token.type == T_IDENTIFIER) {
2699 symbol = token.v.symbol;
2702 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2703 } else if (token.type != '{') {
2704 parse_error_expected("while parsing enum type specifier",
2705 T_IDENTIFIER, '{', NULL);
2712 if (declaration == NULL) {
2713 declaration = allocate_declaration_zero();
2714 declaration->namespc = NAMESPACE_ENUM;
2715 declaration->source_position = token.source_position;
2716 declaration->symbol = symbol;
2717 declaration->parent_scope = scope;
2720 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2721 type->enumt.declaration = declaration;
2723 if (token.type == '{') {
2724 if (declaration->init.complete) {
2725 errorf(HERE, "multiple definitions of enum %Y", symbol);
2727 if (symbol != NULL) {
2728 environment_push(declaration);
2730 append_declaration(declaration);
2731 declaration->init.complete = true;
2733 parse_enum_entries(type);
2734 parse_attributes(&attributes);
2741 * if a symbol is a typedef to another type, return true
2743 static bool is_typedef_symbol(symbol_t *symbol)
2745 const declaration_t *const declaration =
2746 get_declaration(symbol, NAMESPACE_NORMAL);
2748 declaration != NULL &&
2749 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2752 static type_t *parse_typeof(void)
2759 add_anchor_token(')');
2761 expression_t *expression = NULL;
2764 switch(token.type) {
2765 case T___extension__:
2766 /* this can be a prefix to a typename or an expression */
2767 /* we simply eat it now. */
2770 } while(token.type == T___extension__);
2774 if (is_typedef_symbol(token.v.symbol)) {
2775 type = parse_typename();
2777 expression = parse_expression();
2778 type = expression->base.type;
2783 type = parse_typename();
2787 expression = parse_expression();
2788 type = expression->base.type;
2792 rem_anchor_token(')');
2795 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2796 typeof_type->typeoft.expression = expression;
2797 typeof_type->typeoft.typeof_type = type;
2805 SPECIFIER_SIGNED = 1 << 0,
2806 SPECIFIER_UNSIGNED = 1 << 1,
2807 SPECIFIER_LONG = 1 << 2,
2808 SPECIFIER_INT = 1 << 3,
2809 SPECIFIER_DOUBLE = 1 << 4,
2810 SPECIFIER_CHAR = 1 << 5,
2811 SPECIFIER_SHORT = 1 << 6,
2812 SPECIFIER_LONG_LONG = 1 << 7,
2813 SPECIFIER_FLOAT = 1 << 8,
2814 SPECIFIER_BOOL = 1 << 9,
2815 SPECIFIER_VOID = 1 << 10,
2816 SPECIFIER_INT8 = 1 << 11,
2817 SPECIFIER_INT16 = 1 << 12,
2818 SPECIFIER_INT32 = 1 << 13,
2819 SPECIFIER_INT64 = 1 << 14,
2820 SPECIFIER_INT128 = 1 << 15,
2821 SPECIFIER_COMPLEX = 1 << 16,
2822 SPECIFIER_IMAGINARY = 1 << 17,
2825 static type_t *create_builtin_type(symbol_t *const symbol,
2826 type_t *const real_type)
2828 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2829 type->builtin.symbol = symbol;
2830 type->builtin.real_type = real_type;
2832 type_t *result = typehash_insert(type);
2833 if (type != result) {
2840 static type_t *get_typedef_type(symbol_t *symbol)
2842 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2843 if (declaration == NULL ||
2844 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2847 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2848 type->typedeft.declaration = declaration;
2854 * check for the allowed MS alignment values.
2856 static bool check_elignment_value(long long intvalue) {
2857 if (intvalue < 1 || intvalue > 8192) {
2858 errorf(HERE, "illegal alignment value");
2861 unsigned v = (unsigned)intvalue;
2862 for(unsigned i = 1; i <= 8192; i += i) {
2866 errorf(HERE, "alignment must be power of two");
2870 #define DET_MOD(name, tag) do { \
2871 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2872 *modifiers |= tag; \
2875 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2877 decl_modifiers_t *modifiers = &specifiers->modifiers;
2880 if (token.type == T_restrict) {
2882 DET_MOD(restrict, DM_RESTRICT);
2884 } else if (token.type != T_IDENTIFIER)
2886 symbol_t *symbol = token.v.symbol;
2887 if (symbol == sym_align) {
2890 if (token.type != T_INTEGER)
2892 if (check_elignment_value(token.v.intvalue)) {
2893 if (specifiers->alignment != 0)
2894 warningf(HERE, "align used more than once");
2895 specifiers->alignment = (unsigned char)token.v.intvalue;
2899 } else if (symbol == sym_allocate) {
2902 if (token.type != T_IDENTIFIER)
2904 (void)token.v.symbol;
2906 } else if (symbol == sym_dllimport) {
2908 DET_MOD(dllimport, DM_DLLIMPORT);
2909 } else if (symbol == sym_dllexport) {
2911 DET_MOD(dllexport, DM_DLLEXPORT);
2912 } else if (symbol == sym_thread) {
2914 DET_MOD(thread, DM_THREAD);
2915 } else if (symbol == sym_naked) {
2917 DET_MOD(naked, DM_NAKED);
2918 } else if (symbol == sym_noinline) {
2920 DET_MOD(noinline, DM_NOINLINE);
2921 } else if (symbol == sym_noreturn) {
2923 DET_MOD(noreturn, DM_NORETURN);
2924 } else if (symbol == sym_nothrow) {
2926 DET_MOD(nothrow, DM_NOTHROW);
2927 } else if (symbol == sym_novtable) {
2929 DET_MOD(novtable, DM_NOVTABLE);
2930 } else if (symbol == sym_property) {
2934 bool is_get = false;
2935 if (token.type != T_IDENTIFIER)
2937 if (token.v.symbol == sym_get) {
2939 } else if (token.v.symbol == sym_put) {
2941 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2946 if (token.type != T_IDENTIFIER)
2949 if (specifiers->get_property_sym != NULL) {
2950 errorf(HERE, "get property name already specified");
2952 specifiers->get_property_sym = token.v.symbol;
2955 if (specifiers->put_property_sym != NULL) {
2956 errorf(HERE, "put property name already specified");
2958 specifiers->put_property_sym = token.v.symbol;
2962 if (token.type == ',') {
2969 } else if (symbol == sym_selectany) {
2971 DET_MOD(selectany, DM_SELECTANY);
2972 } else if (symbol == sym_uuid) {
2975 if (token.type != T_STRING_LITERAL)
2979 } else if (symbol == sym_deprecated) {
2981 if (specifiers->deprecated != 0)
2982 warningf(HERE, "deprecated used more than once");
2983 specifiers->deprecated = 1;
2984 if (token.type == '(') {
2986 if (token.type == T_STRING_LITERAL) {
2987 specifiers->deprecated_string = token.v.string.begin;
2990 errorf(HERE, "string literal expected");
2994 } else if (symbol == sym_noalias) {
2996 DET_MOD(noalias, DM_NOALIAS);
2998 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3000 if (token.type == '(')
3004 if (token.type == ',')
3011 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3013 type_t *type = NULL;
3014 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3015 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3016 unsigned type_specifiers = 0;
3019 specifiers->source_position = token.source_position;
3022 switch(token.type) {
3025 #define MATCH_STORAGE_CLASS(token, class) \
3027 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3028 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3030 specifiers->declared_storage_class = class; \
3034 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3035 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3036 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3037 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3038 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3043 add_anchor_token(')');
3044 parse_microsoft_extended_decl_modifier(specifiers);
3045 rem_anchor_token(')');
3050 switch (specifiers->declared_storage_class) {
3051 case STORAGE_CLASS_NONE:
3052 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3055 case STORAGE_CLASS_EXTERN:
3056 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3059 case STORAGE_CLASS_STATIC:
3060 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3064 errorf(HERE, "multiple storage classes in declaration specifiers");
3070 /* type qualifiers */
3071 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3073 qualifiers |= qualifier; \
3077 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3078 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3079 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3080 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3081 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3082 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3083 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3084 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3086 case T___extension__:
3091 /* type specifiers */
3092 #define MATCH_SPECIFIER(token, specifier, name) \
3095 if (type_specifiers & specifier) { \
3096 errorf(HERE, "multiple " name " type specifiers given"); \
3098 type_specifiers |= specifier; \
3102 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
3103 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
3104 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
3105 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
3106 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
3107 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
3108 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
3109 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
3110 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
3111 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8")
3112 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16")
3113 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32")
3114 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64")
3115 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128")
3116 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
3117 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
3119 case T__forceinline:
3120 /* only in microsoft mode */
3121 specifiers->modifiers |= DM_FORCEINLINE;
3125 specifiers->is_inline = true;
3130 if (type_specifiers & SPECIFIER_LONG_LONG) {
3131 errorf(HERE, "multiple type specifiers given");
3132 } else if (type_specifiers & SPECIFIER_LONG) {
3133 type_specifiers |= SPECIFIER_LONG_LONG;
3135 type_specifiers |= SPECIFIER_LONG;
3140 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3142 type->compound.declaration = parse_compound_type_specifier(true);
3146 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3147 type->compound.declaration = parse_compound_type_specifier(false);
3148 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3149 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3153 type = parse_enum_specifier();
3156 type = parse_typeof();
3158 case T___builtin_va_list:
3159 type = duplicate_type(type_valist);
3163 case T___attribute__:
3164 specifiers->modifiers
3165 |= parse_attributes(&specifiers->gnu_attributes);
3166 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3167 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3170 case T_IDENTIFIER: {
3171 /* only parse identifier if we haven't found a type yet */
3172 if (type != NULL || type_specifiers != 0)
3173 goto finish_specifiers;
3175 type_t *typedef_type = get_typedef_type(token.v.symbol);
3177 if (typedef_type == NULL)
3178 goto finish_specifiers;
3181 type = typedef_type;
3185 /* function specifier */
3187 goto finish_specifiers;
3194 atomic_type_kind_t atomic_type;
3196 /* match valid basic types */
3197 switch(type_specifiers) {
3198 case SPECIFIER_VOID:
3199 atomic_type = ATOMIC_TYPE_VOID;
3201 case SPECIFIER_CHAR:
3202 atomic_type = ATOMIC_TYPE_CHAR;
3204 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3205 atomic_type = ATOMIC_TYPE_SCHAR;
3207 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3208 atomic_type = ATOMIC_TYPE_UCHAR;
3210 case SPECIFIER_SHORT:
3211 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3212 case SPECIFIER_SHORT | SPECIFIER_INT:
3213 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3214 atomic_type = ATOMIC_TYPE_SHORT;
3216 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3217 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3218 atomic_type = ATOMIC_TYPE_USHORT;
3221 case SPECIFIER_SIGNED:
3222 case SPECIFIER_SIGNED | SPECIFIER_INT:
3223 atomic_type = ATOMIC_TYPE_INT;
3225 case SPECIFIER_UNSIGNED:
3226 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3227 atomic_type = ATOMIC_TYPE_UINT;
3229 case SPECIFIER_LONG:
3230 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3231 case SPECIFIER_LONG | SPECIFIER_INT:
3232 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3233 atomic_type = ATOMIC_TYPE_LONG;
3235 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3236 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3237 atomic_type = ATOMIC_TYPE_ULONG;
3239 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3240 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3241 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3242 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3244 atomic_type = ATOMIC_TYPE_LONGLONG;
3246 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3247 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3249 atomic_type = ATOMIC_TYPE_ULONGLONG;
3252 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3253 atomic_type = unsigned_int8_type_kind;
3256 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3257 atomic_type = unsigned_int16_type_kind;
3260 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3261 atomic_type = unsigned_int32_type_kind;
3264 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3265 atomic_type = unsigned_int64_type_kind;
3268 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3269 atomic_type = unsigned_int128_type_kind;
3272 case SPECIFIER_INT8:
3273 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3274 atomic_type = int8_type_kind;
3277 case SPECIFIER_INT16:
3278 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3279 atomic_type = int16_type_kind;
3282 case SPECIFIER_INT32:
3283 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3284 atomic_type = int32_type_kind;
3287 case SPECIFIER_INT64:
3288 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3289 atomic_type = int64_type_kind;
3292 case SPECIFIER_INT128:
3293 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3294 atomic_type = int128_type_kind;
3297 case SPECIFIER_FLOAT:
3298 atomic_type = ATOMIC_TYPE_FLOAT;
3300 case SPECIFIER_DOUBLE:
3301 atomic_type = ATOMIC_TYPE_DOUBLE;
3303 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3304 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3306 case SPECIFIER_BOOL:
3307 atomic_type = ATOMIC_TYPE_BOOL;
3309 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3310 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3311 atomic_type = ATOMIC_TYPE_FLOAT;
3313 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3314 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3315 atomic_type = ATOMIC_TYPE_DOUBLE;
3317 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3318 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3319 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3322 /* invalid specifier combination, give an error message */
3323 if (type_specifiers == 0) {
3324 if (! strict_mode) {
3325 if (warning.implicit_int) {
3326 warningf(HERE, "no type specifiers in declaration, using 'int'");
3328 atomic_type = ATOMIC_TYPE_INT;
3331 errorf(HERE, "no type specifiers given in declaration");
3333 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3334 (type_specifiers & SPECIFIER_UNSIGNED)) {
3335 errorf(HERE, "signed and unsigned specifiers gives");
3336 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3337 errorf(HERE, "only integer types can be signed or unsigned");
3339 errorf(HERE, "multiple datatypes in declaration");
3341 atomic_type = ATOMIC_TYPE_INVALID;
3344 if (type_specifiers & SPECIFIER_COMPLEX &&
3345 atomic_type != ATOMIC_TYPE_INVALID) {
3346 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3347 type->complex.akind = atomic_type;
3348 } else if (type_specifiers & SPECIFIER_IMAGINARY &&
3349 atomic_type != ATOMIC_TYPE_INVALID) {
3350 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3351 type->imaginary.akind = atomic_type;
3353 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3354 type->atomic.akind = atomic_type;
3358 if (type_specifiers != 0) {
3359 errorf(HERE, "multiple datatypes in declaration");
3363 /* FIXME: check type qualifiers here */
3365 type->base.qualifiers = qualifiers;
3366 type->base.modifiers = modifiers;
3368 type_t *result = typehash_insert(type);
3369 if (newtype && result != type) {
3373 specifiers->type = result;
3378 static type_qualifiers_t parse_type_qualifiers(void)
3380 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3383 switch(token.type) {
3384 /* type qualifiers */
3385 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3386 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3387 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3388 /* microsoft extended type modifiers */
3389 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3390 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3391 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3392 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3393 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3401 static declaration_t *parse_identifier_list(void)
3403 declaration_t *declarations = NULL;
3404 declaration_t *last_declaration = NULL;
3406 declaration_t *const declaration = allocate_declaration_zero();
3407 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3408 declaration->source_position = token.source_position;
3409 declaration->symbol = token.v.symbol;
3412 if (last_declaration != NULL) {
3413 last_declaration->next = declaration;
3415 declarations = declaration;
3417 last_declaration = declaration;
3419 if (token.type != ',') {
3423 } while(token.type == T_IDENTIFIER);
3425 return declarations;
3428 static void semantic_parameter(declaration_t *declaration)
3430 /* TODO: improve error messages */
3432 if (declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3433 errorf(HERE, "typedef not allowed in parameter list");
3434 } else if (declaration->declared_storage_class != STORAGE_CLASS_NONE
3435 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3436 errorf(HERE, "parameter may only have none or register storage class");
3439 type_t *const orig_type = declaration->type;
3440 type_t * type = skip_typeref(orig_type);
3442 /* Array as last part of a parameter type is just syntactic sugar. Turn it
3443 * into a pointer. § 6.7.5.3 (7) */
3444 if (is_type_array(type)) {
3445 type_t *const element_type = type->array.element_type;
3447 type = make_pointer_type(element_type, type->base.qualifiers);
3449 declaration->type = type;
3452 if (is_type_incomplete(type)) {
3453 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3454 orig_type, declaration->symbol);
3458 static declaration_t *parse_parameter(void)
3460 declaration_specifiers_t specifiers;
3461 memset(&specifiers, 0, sizeof(specifiers));
3463 parse_declaration_specifiers(&specifiers);
3465 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3470 static declaration_t *parse_parameters(function_type_t *type)
3472 declaration_t *declarations = NULL;
3475 add_anchor_token(')');
3476 int saved_comma_state = save_and_reset_anchor_state(',');
3478 if (token.type == T_IDENTIFIER) {
3479 symbol_t *symbol = token.v.symbol;
3480 if (!is_typedef_symbol(symbol)) {
3481 type->kr_style_parameters = true;
3482 declarations = parse_identifier_list();
3483 goto parameters_finished;
3487 if (token.type == ')') {
3488 type->unspecified_parameters = 1;
3489 goto parameters_finished;
3492 declaration_t *declaration;
3493 declaration_t *last_declaration = NULL;
3494 function_parameter_t *parameter;
3495 function_parameter_t *last_parameter = NULL;
3498 switch(token.type) {
3502 goto parameters_finished;
3505 case T___extension__:
3507 declaration = parse_parameter();
3509 /* func(void) is not a parameter */
3510 if (last_parameter == NULL
3511 && token.type == ')'
3512 && declaration->symbol == NULL
3513 && skip_typeref(declaration->type) == type_void) {
3514 goto parameters_finished;
3516 semantic_parameter(declaration);
3518 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3519 memset(parameter, 0, sizeof(parameter[0]));
3520 parameter->type = declaration->type;
3522 if (last_parameter != NULL) {
3523 last_declaration->next = declaration;
3524 last_parameter->next = parameter;
3526 type->parameters = parameter;
3527 declarations = declaration;
3529 last_parameter = parameter;
3530 last_declaration = declaration;
3534 goto parameters_finished;
3536 if (token.type != ',') {
3537 goto parameters_finished;
3543 parameters_finished:
3544 rem_anchor_token(')');
3547 restore_anchor_state(',', saved_comma_state);
3548 return declarations;
3551 restore_anchor_state(',', saved_comma_state);
3560 } construct_type_kind_t;
3562 typedef struct construct_type_t construct_type_t;
3563 struct construct_type_t {
3564 construct_type_kind_t kind;
3565 construct_type_t *next;
3568 typedef struct parsed_pointer_t parsed_pointer_t;
3569 struct parsed_pointer_t {
3570 construct_type_t construct_type;
3571 type_qualifiers_t type_qualifiers;
3574 typedef struct construct_function_type_t construct_function_type_t;
3575 struct construct_function_type_t {
3576 construct_type_t construct_type;
3577 type_t *function_type;
3580 typedef struct parsed_array_t parsed_array_t;
3581 struct parsed_array_t {
3582 construct_type_t construct_type;
3583 type_qualifiers_t type_qualifiers;
3589 typedef struct construct_base_type_t construct_base_type_t;
3590 struct construct_base_type_t {
3591 construct_type_t construct_type;
3595 static construct_type_t *parse_pointer_declarator(void)
3599 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3600 memset(pointer, 0, sizeof(pointer[0]));
3601 pointer->construct_type.kind = CONSTRUCT_POINTER;
3602 pointer->type_qualifiers = parse_type_qualifiers();
3604 return (construct_type_t*) pointer;
3607 static construct_type_t *parse_array_declarator(void)
3610 add_anchor_token(']');
3612 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3613 memset(array, 0, sizeof(array[0]));
3614 array->construct_type.kind = CONSTRUCT_ARRAY;
3616 if (token.type == T_static) {
3617 array->is_static = true;
3621 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3622 if (type_qualifiers != 0) {
3623 if (token.type == T_static) {
3624 array->is_static = true;
3628 array->type_qualifiers = type_qualifiers;
3630 if (token.type == '*' && look_ahead(1)->type == ']') {
3631 array->is_variable = true;
3633 } else if (token.type != ']') {
3634 array->size = parse_assignment_expression();
3637 rem_anchor_token(']');
3640 return (construct_type_t*) array;
3645 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3648 if (declaration != NULL) {
3649 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3651 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3654 declaration_t *parameters = parse_parameters(&type->function);
3655 if (declaration != NULL) {
3656 declaration->scope.declarations = parameters;
3659 construct_function_type_t *construct_function_type =
3660 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3661 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3662 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3663 construct_function_type->function_type = type;
3665 return (construct_type_t*) construct_function_type;
3668 static void fix_declaration_type(declaration_t *declaration)
3670 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3671 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3673 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3674 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3676 if (declaration->type->base.modifiers == type_modifiers)
3679 type_t *copy = duplicate_type(declaration->type);
3680 copy->base.modifiers = type_modifiers;
3682 type_t *result = typehash_insert(copy);
3683 if (result != copy) {
3684 obstack_free(type_obst, copy);
3687 declaration->type = result;
3690 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3691 bool may_be_abstract)
3693 /* construct a single linked list of construct_type_t's which describe
3694 * how to construct the final declarator type */
3695 construct_type_t *first = NULL;
3696 construct_type_t *last = NULL;
3697 gnu_attribute_t *attributes = NULL;
3699 decl_modifiers_t modifiers = parse_attributes(&attributes);
3702 while(token.type == '*') {
3703 construct_type_t *type = parse_pointer_declarator();
3713 /* TODO: find out if this is correct */
3714 modifiers |= parse_attributes(&attributes);
3717 construct_type_t *inner_types = NULL;
3719 switch(token.type) {
3721 if (declaration == NULL) {
3722 errorf(HERE, "no identifier expected in typename");
3724 declaration->symbol = token.v.symbol;
3725 declaration->source_position = token.source_position;
3731 add_anchor_token(')');
3732 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3733 rem_anchor_token(')');
3737 if (may_be_abstract)
3739 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3740 /* avoid a loop in the outermost scope, because eat_statement doesn't
3742 if (token.type == '}' && current_function == NULL) {
3750 construct_type_t *p = last;
3753 construct_type_t *type;
3754 switch(token.type) {
3756 type = parse_function_declarator(declaration);
3759 type = parse_array_declarator();
3762 goto declarator_finished;
3765 /* insert in the middle of the list (behind p) */
3767 type->next = p->next;
3778 declarator_finished:
3779 /* append inner_types at the end of the list, we don't to set last anymore
3780 * as it's not needed anymore */
3782 assert(first == NULL);
3783 first = inner_types;
3785 last->next = inner_types;
3793 static void parse_declaration_attributes(declaration_t *declaration)
3795 gnu_attribute_t *attributes = NULL;
3796 decl_modifiers_t modifiers = parse_attributes(&attributes);
3798 if (declaration == NULL)
3801 declaration->modifiers |= modifiers;
3802 /* check if we have these stupid mode attributes... */
3803 type_t *old_type = declaration->type;
3804 if (old_type == NULL)
3807 gnu_attribute_t *attribute = attributes;
3808 for ( ; attribute != NULL; attribute = attribute->next) {
3809 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
3812 atomic_type_kind_t akind = attribute->u.akind;
3813 if (!is_type_signed(old_type)) {
3815 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
3816 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
3817 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
3818 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
3820 panic("invalid akind in mode attribute");
3824 = make_atomic_type(akind, old_type->base.qualifiers);
3828 static type_t *construct_declarator_type(construct_type_t *construct_list,
3831 construct_type_t *iter = construct_list;
3832 for( ; iter != NULL; iter = iter->next) {
3833 switch(iter->kind) {
3834 case CONSTRUCT_INVALID:
3835 internal_errorf(HERE, "invalid type construction found");
3836 case CONSTRUCT_FUNCTION: {
3837 construct_function_type_t *construct_function_type
3838 = (construct_function_type_t*) iter;
3840 type_t *function_type = construct_function_type->function_type;
3842 function_type->function.return_type = type;
3844 type_t *skipped_return_type = skip_typeref(type);
3845 if (is_type_function(skipped_return_type)) {
3846 errorf(HERE, "function returning function is not allowed");
3847 type = type_error_type;
3848 } else if (is_type_array(skipped_return_type)) {
3849 errorf(HERE, "function returning array is not allowed");
3850 type = type_error_type;
3852 type = function_type;
3857 case CONSTRUCT_POINTER: {
3858 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3859 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3860 pointer_type->pointer.points_to = type;
3861 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3863 type = pointer_type;
3867 case CONSTRUCT_ARRAY: {
3868 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3869 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3871 expression_t *size_expression = parsed_array->size;
3872 if (size_expression != NULL) {
3874 = create_implicit_cast(size_expression, type_size_t);
3877 array_type->base.qualifiers = parsed_array->type_qualifiers;
3878 array_type->array.element_type = type;
3879 array_type->array.is_static = parsed_array->is_static;
3880 array_type->array.is_variable = parsed_array->is_variable;
3881 array_type->array.size_expression = size_expression;
3883 if (size_expression != NULL) {
3884 if (is_constant_expression(size_expression)) {
3885 array_type->array.size_constant = true;
3886 array_type->array.size
3887 = fold_constant(size_expression);
3889 array_type->array.is_vla = true;
3893 type_t *skipped_type = skip_typeref(type);
3894 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3895 errorf(HERE, "array of void is not allowed");
3896 type = type_error_type;
3904 type_t *hashed_type = typehash_insert(type);
3905 if (hashed_type != type) {
3906 /* the function type was constructed earlier freeing it here will
3907 * destroy other types... */
3908 if (iter->kind != CONSTRUCT_FUNCTION) {
3918 static declaration_t *parse_declarator(
3919 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3921 declaration_t *const declaration = allocate_declaration_zero();
3922 declaration->declared_storage_class = specifiers->declared_storage_class;
3923 declaration->modifiers = specifiers->modifiers;
3924 declaration->deprecated = specifiers->deprecated;
3925 declaration->deprecated_string = specifiers->deprecated_string;
3926 declaration->get_property_sym = specifiers->get_property_sym;
3927 declaration->put_property_sym = specifiers->put_property_sym;
3928 declaration->is_inline = specifiers->is_inline;
3930 declaration->storage_class = specifiers->declared_storage_class;
3931 if (declaration->storage_class == STORAGE_CLASS_NONE
3932 && scope != global_scope) {
3933 declaration->storage_class = STORAGE_CLASS_AUTO;
3936 if (specifiers->alignment != 0) {
3937 /* TODO: add checks here */
3938 declaration->alignment = specifiers->alignment;
3941 construct_type_t *construct_type
3942 = parse_inner_declarator(declaration, may_be_abstract);
3943 type_t *const type = specifiers->type;
3944 declaration->type = construct_declarator_type(construct_type, type);
3946 parse_declaration_attributes(declaration);
3948 fix_declaration_type(declaration);
3950 if (construct_type != NULL) {
3951 obstack_free(&temp_obst, construct_type);
3957 static type_t *parse_abstract_declarator(type_t *base_type)
3959 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
3961 type_t *result = construct_declarator_type(construct_type, base_type);
3962 if (construct_type != NULL) {
3963 obstack_free(&temp_obst, construct_type);
3969 static declaration_t *append_declaration(declaration_t* const declaration)
3971 if (last_declaration != NULL) {
3972 last_declaration->next = declaration;
3974 scope->declarations = declaration;
3976 last_declaration = declaration;
3981 * Check if the declaration of main is suspicious. main should be a
3982 * function with external linkage, returning int, taking either zero
3983 * arguments, two, or three arguments of appropriate types, ie.
3985 * int main([ int argc, char **argv [, char **env ] ]).
3987 * @param decl the declaration to check
3988 * @param type the function type of the declaration
3990 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
3992 if (decl->storage_class == STORAGE_CLASS_STATIC) {
3993 warningf(&decl->source_position,
3994 "'main' is normally a non-static function");
3996 if (skip_typeref(func_type->return_type) != type_int) {
3997 warningf(&decl->source_position,
3998 "return type of 'main' should be 'int', but is '%T'",
3999 func_type->return_type);
4001 const function_parameter_t *parm = func_type->parameters;
4003 type_t *const first_type = parm->type;
4004 if (!types_compatible(skip_typeref(first_type), type_int)) {
4005 warningf(&decl->source_position,
4006 "first argument of 'main' should be 'int', but is '%T'", first_type);
4010 type_t *const second_type = parm->type;
4011 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4012 warningf(&decl->source_position,
4013 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4017 type_t *const third_type = parm->type;
4018 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4019 warningf(&decl->source_position,
4020 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4024 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4028 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4034 * Check if a symbol is the equal to "main".
4036 static bool is_sym_main(const symbol_t *const sym)
4038 return strcmp(sym->string, "main") == 0;
4041 static declaration_t *internal_record_declaration(
4042 declaration_t *const declaration,
4043 const bool is_function_definition)
4045 const symbol_t *const symbol = declaration->symbol;
4046 const namespace_t namespc = (namespace_t)declaration->namespc;
4048 assert(declaration->symbol != NULL);
4049 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4051 type_t *const orig_type = declaration->type;
4052 type_t *const type = skip_typeref(orig_type);
4053 if (is_type_function(type) &&
4054 type->function.unspecified_parameters &&
4055 warning.strict_prototypes &&
4056 previous_declaration == NULL) {
4057 warningf(&declaration->source_position,
4058 "function declaration '%#T' is not a prototype",
4059 orig_type, declaration->symbol);
4062 if (is_function_definition && warning.main && is_sym_main(symbol)) {
4063 check_type_of_main(declaration, &type->function);
4066 assert(declaration != previous_declaration);
4067 if (previous_declaration != NULL
4068 && previous_declaration->parent_scope == scope) {
4069 /* can happen for K&R style declarations */
4070 if (previous_declaration->type == NULL) {
4071 previous_declaration->type = declaration->type;
4074 const type_t *prev_type = skip_typeref(previous_declaration->type);
4075 if (!types_compatible(type, prev_type)) {
4076 errorf(&declaration->source_position,
4077 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4078 orig_type, symbol, previous_declaration->type, symbol,
4079 &previous_declaration->source_position);
4081 unsigned old_storage_class = previous_declaration->storage_class;
4082 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4083 errorf(&declaration->source_position,
4084 "redeclaration of enum entry '%Y' (declared %P)",
4085 symbol, &previous_declaration->source_position);
4086 return previous_declaration;
4089 unsigned new_storage_class = declaration->storage_class;
4091 if (is_type_incomplete(prev_type)) {
4092 previous_declaration->type = type;
4096 /* pretend no storage class means extern for function
4097 * declarations (except if the previous declaration is neither
4098 * none nor extern) */
4099 if (is_type_function(type)) {
4100 if (prev_type->function.unspecified_parameters) {
4101 previous_declaration->type = type;
4105 switch (old_storage_class) {
4106 case STORAGE_CLASS_NONE:
4107 old_storage_class = STORAGE_CLASS_EXTERN;
4110 case STORAGE_CLASS_EXTERN:
4111 if (is_function_definition) {
4112 if (warning.missing_prototypes &&
4113 prev_type->function.unspecified_parameters &&
4114 !is_sym_main(symbol)) {
4115 warningf(&declaration->source_position,
4116 "no previous prototype for '%#T'",
4119 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4120 new_storage_class = STORAGE_CLASS_EXTERN;
4129 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4130 new_storage_class == STORAGE_CLASS_EXTERN) {
4131 warn_redundant_declaration:
4132 if (warning.redundant_decls && strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4133 warningf(&declaration->source_position,
4134 "redundant declaration for '%Y' (declared %P)",
4135 symbol, &previous_declaration->source_position);
4137 } else if (current_function == NULL) {
4138 if (old_storage_class != STORAGE_CLASS_STATIC &&
4139 new_storage_class == STORAGE_CLASS_STATIC) {
4140 errorf(&declaration->source_position,
4141 "static declaration of '%Y' follows non-static declaration (declared %P)",
4142 symbol, &previous_declaration->source_position);
4143 } else if (old_storage_class != STORAGE_CLASS_EXTERN
4144 && !is_function_definition) {
4145 goto warn_redundant_declaration;
4146 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4147 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4148 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4150 } else if (old_storage_class == new_storage_class) {
4151 errorf(&declaration->source_position,
4152 "redeclaration of '%Y' (declared %P)",
4153 symbol, &previous_declaration->source_position);
4155 errorf(&declaration->source_position,
4156 "redeclaration of '%Y' with different linkage (declared %P)",
4157 symbol, &previous_declaration->source_position);
4161 if (declaration->is_inline)
4162 previous_declaration->is_inline = true;
4163 return previous_declaration;
4164 } else if (is_function_definition) {
4165 if (declaration->storage_class != STORAGE_CLASS_STATIC) {
4166 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4167 warningf(&declaration->source_position,
4168 "no previous prototype for '%#T'", orig_type, symbol);
4169 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4170 warningf(&declaration->source_position,
4171 "no previous declaration for '%#T'", orig_type,
4175 } else if (warning.missing_declarations &&
4176 scope == global_scope &&
4177 !is_type_function(type) && (
4178 declaration->storage_class == STORAGE_CLASS_NONE ||
4179 declaration->storage_class == STORAGE_CLASS_THREAD
4181 warningf(&declaration->source_position,
4182 "no previous declaration for '%#T'", orig_type, symbol);
4185 assert(declaration->parent_scope == NULL);
4186 assert(scope != NULL);
4188 declaration->parent_scope = scope;
4190 environment_push(declaration);
4191 return append_declaration(declaration);
4194 static declaration_t *record_declaration(declaration_t *declaration)
4196 return internal_record_declaration(declaration, false);
4199 static declaration_t *record_function_definition(declaration_t *declaration)
4201 return internal_record_declaration(declaration, true);
4204 static void parser_error_multiple_definition(declaration_t *declaration,
4205 const source_position_t *source_position)
4207 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4208 declaration->symbol, &declaration->source_position);
4211 static bool is_declaration_specifier(const token_t *token,
4212 bool only_specifiers_qualifiers)
4214 switch(token->type) {
4219 return is_typedef_symbol(token->v.symbol);
4221 case T___extension__:
4223 return !only_specifiers_qualifiers;
4230 static void parse_init_declarator_rest(declaration_t *declaration)
4234 type_t *orig_type = declaration->type;
4235 type_t *type = skip_typeref(orig_type);
4237 if (declaration->init.initializer != NULL) {
4238 parser_error_multiple_definition(declaration, HERE);
4241 bool must_be_constant = false;
4242 if (declaration->storage_class == STORAGE_CLASS_STATIC
4243 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4244 || declaration->parent_scope == global_scope) {
4245 must_be_constant = true;
4248 parse_initializer_env_t env;
4249 env.type = orig_type;
4250 env.must_be_constant = must_be_constant;
4251 env.declaration = declaration;
4253 initializer_t *initializer = parse_initializer(&env);
4255 if (env.type != orig_type) {
4256 orig_type = env.type;
4257 type = skip_typeref(orig_type);
4258 declaration->type = env.type;
4261 if (is_type_function(type)) {
4262 errorf(&declaration->source_position,
4263 "initializers not allowed for function types at declator '%Y' (type '%T')",
4264 declaration->symbol, orig_type);
4266 declaration->init.initializer = initializer;
4270 /* parse rest of a declaration without any declarator */
4271 static void parse_anonymous_declaration_rest(
4272 const declaration_specifiers_t *specifiers,
4273 parsed_declaration_func finished_declaration)
4277 declaration_t *const declaration = allocate_declaration_zero();
4278 declaration->type = specifiers->type;
4279 declaration->declared_storage_class = specifiers->declared_storage_class;
4280 declaration->source_position = specifiers->source_position;
4281 declaration->modifiers = specifiers->modifiers;
4283 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4284 warningf(&declaration->source_position,
4285 "useless storage class in empty declaration");
4287 declaration->storage_class = STORAGE_CLASS_NONE;
4289 type_t *type = declaration->type;
4290 switch (type->kind) {
4291 case TYPE_COMPOUND_STRUCT:
4292 case TYPE_COMPOUND_UNION: {
4293 if (type->compound.declaration->symbol == NULL) {
4294 warningf(&declaration->source_position,
4295 "unnamed struct/union that defines no instances");
4304 warningf(&declaration->source_position, "empty declaration");
4308 finished_declaration(declaration);
4311 static void parse_declaration_rest(declaration_t *ndeclaration,
4312 const declaration_specifiers_t *specifiers,
4313 parsed_declaration_func finished_declaration)
4315 add_anchor_token(';');
4316 add_anchor_token('=');
4317 add_anchor_token(',');
4319 declaration_t *declaration = finished_declaration(ndeclaration);
4321 type_t *orig_type = declaration->type;
4322 type_t *type = skip_typeref(orig_type);
4324 if (type->kind != TYPE_FUNCTION &&
4325 declaration->is_inline &&
4326 is_type_valid(type)) {
4327 warningf(&declaration->source_position,
4328 "variable '%Y' declared 'inline'\n", declaration->symbol);
4331 if (token.type == '=') {
4332 parse_init_declarator_rest(declaration);
4335 if (token.type != ',')
4339 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4344 rem_anchor_token(';');
4345 rem_anchor_token('=');
4346 rem_anchor_token(',');
4349 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4351 symbol_t *symbol = declaration->symbol;
4352 if (symbol == NULL) {
4353 errorf(HERE, "anonymous declaration not valid as function parameter");
4356 namespace_t namespc = (namespace_t) declaration->namespc;
4357 if (namespc != NAMESPACE_NORMAL) {
4358 return record_declaration(declaration);
4361 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4362 if (previous_declaration == NULL ||
4363 previous_declaration->parent_scope != scope) {
4364 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4369 if (previous_declaration->type == NULL) {
4370 previous_declaration->type = declaration->type;
4371 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4372 previous_declaration->storage_class = declaration->storage_class;
4373 previous_declaration->parent_scope = scope;
4374 return previous_declaration;
4376 return record_declaration(declaration);
4380 static void parse_declaration(parsed_declaration_func finished_declaration)
4382 declaration_specifiers_t specifiers;
4383 memset(&specifiers, 0, sizeof(specifiers));
4384 parse_declaration_specifiers(&specifiers);
4386 if (token.type == ';') {
4387 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4389 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4390 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4394 static type_t *get_default_promoted_type(type_t *orig_type)
4396 type_t *result = orig_type;
4398 type_t *type = skip_typeref(orig_type);
4399 if (is_type_integer(type)) {
4400 result = promote_integer(type);
4401 } else if (type == type_float) {
4402 result = type_double;
4408 static void parse_kr_declaration_list(declaration_t *declaration)
4410 type_t *type = skip_typeref(declaration->type);
4411 if (!is_type_function(type))
4414 if (!type->function.kr_style_parameters)
4417 /* push function parameters */
4418 int top = environment_top();
4419 scope_t *last_scope = scope;
4420 set_scope(&declaration->scope);
4422 declaration_t *parameter = declaration->scope.declarations;
4423 for ( ; parameter != NULL; parameter = parameter->next) {
4424 assert(parameter->parent_scope == NULL);
4425 parameter->parent_scope = scope;
4426 environment_push(parameter);
4429 /* parse declaration list */
4430 while (is_declaration_specifier(&token, false)) {
4431 parse_declaration(finished_kr_declaration);
4434 /* pop function parameters */
4435 assert(scope == &declaration->scope);
4436 set_scope(last_scope);
4437 environment_pop_to(top);
4439 /* update function type */
4440 type_t *new_type = duplicate_type(type);
4442 function_parameter_t *parameters = NULL;
4443 function_parameter_t *last_parameter = NULL;
4445 declaration_t *parameter_declaration = declaration->scope.declarations;
4446 for( ; parameter_declaration != NULL;
4447 parameter_declaration = parameter_declaration->next) {
4448 type_t *parameter_type = parameter_declaration->type;
4449 if (parameter_type == NULL) {
4451 errorf(HERE, "no type specified for function parameter '%Y'",
4452 parameter_declaration->symbol);
4454 if (warning.implicit_int) {
4455 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4456 parameter_declaration->symbol);
4458 parameter_type = type_int;
4459 parameter_declaration->type = parameter_type;
4463 semantic_parameter(parameter_declaration);
4464 parameter_type = parameter_declaration->type;
4467 * we need the default promoted types for the function type
4469 parameter_type = get_default_promoted_type(parameter_type);
4471 function_parameter_t *function_parameter
4472 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4473 memset(function_parameter, 0, sizeof(function_parameter[0]));
4475 function_parameter->type = parameter_type;
4476 if (last_parameter != NULL) {
4477 last_parameter->next = function_parameter;
4479 parameters = function_parameter;
4481 last_parameter = function_parameter;
4484 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4486 new_type->function.parameters = parameters;
4487 new_type->function.unspecified_parameters = true;
4489 type = typehash_insert(new_type);
4490 if (type != new_type) {
4491 obstack_free(type_obst, new_type);
4494 declaration->type = type;
4497 static bool first_err = true;
4500 * When called with first_err set, prints the name of the current function,
4503 static void print_in_function(void) {
4506 diagnosticf("%s: In function '%Y':\n",
4507 current_function->source_position.input_name,
4508 current_function->symbol);
4513 * Check if all labels are defined in the current function.
4514 * Check if all labels are used in the current function.
4516 static void check_labels(void)
4518 for (const goto_statement_t *goto_statement = goto_first;
4519 goto_statement != NULL;
4520 goto_statement = goto_statement->next) {
4521 declaration_t *label = goto_statement->label;
4524 if (label->source_position.input_name == NULL) {
4525 print_in_function();
4526 errorf(&goto_statement->base.source_position,
4527 "label '%Y' used but not defined", label->symbol);
4530 goto_first = goto_last = NULL;
4532 if (warning.unused_label) {
4533 for (const label_statement_t *label_statement = label_first;
4534 label_statement != NULL;
4535 label_statement = label_statement->next) {
4536 const declaration_t *label = label_statement->label;
4538 if (! label->used) {
4539 print_in_function();
4540 warningf(&label_statement->base.source_position,
4541 "label '%Y' defined but not used", label->symbol);
4545 label_first = label_last = NULL;
4549 * Check declarations of current_function for unused entities.
4551 static void check_declarations(void)
4553 if (warning.unused_parameter) {
4554 const scope_t *scope = ¤t_function->scope;
4556 const declaration_t *parameter = scope->declarations;
4557 for (; parameter != NULL; parameter = parameter->next) {
4558 if (! parameter->used) {
4559 print_in_function();
4560 warningf(¶meter->source_position,
4561 "unused parameter '%Y'", parameter->symbol);
4565 if (warning.unused_variable) {
4569 static void parse_external_declaration(void)
4571 /* function-definitions and declarations both start with declaration
4573 declaration_specifiers_t specifiers;
4574 memset(&specifiers, 0, sizeof(specifiers));
4576 add_anchor_token(';');
4577 parse_declaration_specifiers(&specifiers);
4578 rem_anchor_token(';');
4580 /* must be a declaration */
4581 if (token.type == ';') {
4582 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4586 add_anchor_token(',');
4587 add_anchor_token('=');
4588 rem_anchor_token(';');
4590 /* declarator is common to both function-definitions and declarations */
4591 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4593 rem_anchor_token(',');
4594 rem_anchor_token('=');
4595 rem_anchor_token(';');
4597 /* must be a declaration */
4598 if (token.type == ',' || token.type == '=' || token.type == ';') {
4599 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4603 /* must be a function definition */
4604 parse_kr_declaration_list(ndeclaration);
4606 if (token.type != '{') {
4607 parse_error_expected("while parsing function definition", '{', NULL);
4608 eat_until_matching_token(';');
4612 type_t *type = ndeclaration->type;
4614 /* note that we don't skip typerefs: the standard doesn't allow them here
4615 * (so we can't use is_type_function here) */
4616 if (type->kind != TYPE_FUNCTION) {
4617 if (is_type_valid(type)) {
4618 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4619 type, ndeclaration->symbol);
4625 /* § 6.7.5.3 (14) a function definition with () means no
4626 * parameters (and not unspecified parameters) */
4627 if (type->function.unspecified_parameters
4628 && type->function.parameters == NULL
4629 && !type->function.kr_style_parameters) {
4630 type_t *duplicate = duplicate_type(type);
4631 duplicate->function.unspecified_parameters = false;
4633 type = typehash_insert(duplicate);
4634 if (type != duplicate) {
4635 obstack_free(type_obst, duplicate);
4637 ndeclaration->type = type;
4640 declaration_t *const declaration = record_function_definition(ndeclaration);
4641 if (ndeclaration != declaration) {
4642 declaration->scope = ndeclaration->scope;
4644 type = skip_typeref(declaration->type);
4646 /* push function parameters and switch scope */
4647 int top = environment_top();
4648 scope_t *last_scope = scope;
4649 set_scope(&declaration->scope);
4651 declaration_t *parameter = declaration->scope.declarations;
4652 for( ; parameter != NULL; parameter = parameter->next) {
4653 if (parameter->parent_scope == &ndeclaration->scope) {
4654 parameter->parent_scope = scope;
4656 assert(parameter->parent_scope == NULL
4657 || parameter->parent_scope == scope);
4658 parameter->parent_scope = scope;
4659 if (parameter->symbol == NULL) {
4660 errorf(&ndeclaration->source_position, "parameter name omitted");
4663 environment_push(parameter);
4666 if (declaration->init.statement != NULL) {
4667 parser_error_multiple_definition(declaration, HERE);
4669 goto end_of_parse_external_declaration;
4671 /* parse function body */
4672 int label_stack_top = label_top();
4673 declaration_t *old_current_function = current_function;
4674 current_function = declaration;
4676 declaration->init.statement = parse_compound_statement(false);
4679 check_declarations();
4681 assert(current_function == declaration);
4682 current_function = old_current_function;
4683 label_pop_to(label_stack_top);
4686 end_of_parse_external_declaration:
4687 assert(scope == &declaration->scope);
4688 set_scope(last_scope);
4689 environment_pop_to(top);
4692 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4693 source_position_t *source_position)
4695 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4697 type->bitfield.base_type = base_type;
4698 type->bitfield.size = size;
4703 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4706 declaration_t *iter = compound_declaration->scope.declarations;
4707 for( ; iter != NULL; iter = iter->next) {
4708 if (iter->namespc != NAMESPACE_NORMAL)
4711 if (iter->symbol == NULL) {
4712 type_t *type = skip_typeref(iter->type);
4713 if (is_type_compound(type)) {
4714 declaration_t *result
4715 = find_compound_entry(type->compound.declaration, symbol);
4722 if (iter->symbol == symbol) {
4730 static void parse_compound_declarators(declaration_t *struct_declaration,
4731 const declaration_specifiers_t *specifiers)
4733 declaration_t *last_declaration = struct_declaration->scope.declarations;
4734 if (last_declaration != NULL) {
4735 while(last_declaration->next != NULL) {
4736 last_declaration = last_declaration->next;
4741 declaration_t *declaration;
4743 if (token.type == ':') {
4744 source_position_t source_position = *HERE;
4747 type_t *base_type = specifiers->type;
4748 expression_t *size = parse_constant_expression();
4750 if (!is_type_integer(skip_typeref(base_type))) {
4751 errorf(HERE, "bitfield base type '%T' is not an integer type",
4755 type_t *type = make_bitfield_type(base_type, size, &source_position);
4757 declaration = allocate_declaration_zero();
4758 declaration->namespc = NAMESPACE_NORMAL;
4759 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4760 declaration->storage_class = STORAGE_CLASS_NONE;
4761 declaration->source_position = source_position;
4762 declaration->modifiers = specifiers->modifiers;
4763 declaration->type = type;
4765 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4767 type_t *orig_type = declaration->type;
4768 type_t *type = skip_typeref(orig_type);
4770 if (token.type == ':') {
4771 source_position_t source_position = *HERE;
4773 expression_t *size = parse_constant_expression();
4775 if (!is_type_integer(type)) {
4776 errorf(HERE, "bitfield base type '%T' is not an "
4777 "integer type", orig_type);
4780 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4781 declaration->type = bitfield_type;
4783 /* TODO we ignore arrays for now... what is missing is a check
4784 * that they're at the end of the struct */
4785 if (is_type_incomplete(type) && !is_type_array(type)) {
4787 "compound member '%Y' has incomplete type '%T'",
4788 declaration->symbol, orig_type);
4789 } else if (is_type_function(type)) {
4790 errorf(HERE, "compound member '%Y' must not have function "
4791 "type '%T'", declaration->symbol, orig_type);
4796 /* make sure we don't define a symbol multiple times */
4797 symbol_t *symbol = declaration->symbol;
4798 if (symbol != NULL) {
4799 declaration_t *prev_decl
4800 = find_compound_entry(struct_declaration, symbol);
4802 if (prev_decl != NULL) {
4803 assert(prev_decl->symbol == symbol);
4804 errorf(&declaration->source_position,
4805 "multiple declarations of symbol '%Y' (declared %P)",
4806 symbol, &prev_decl->source_position);
4810 /* append declaration */
4811 if (last_declaration != NULL) {
4812 last_declaration->next = declaration;
4814 struct_declaration->scope.declarations = declaration;
4816 last_declaration = declaration;
4818 if (token.type != ',')
4828 static void parse_compound_type_entries(declaration_t *compound_declaration)
4831 add_anchor_token('}');
4833 while(token.type != '}' && token.type != T_EOF) {
4834 declaration_specifiers_t specifiers;
4835 memset(&specifiers, 0, sizeof(specifiers));
4836 parse_declaration_specifiers(&specifiers);
4838 parse_compound_declarators(compound_declaration, &specifiers);
4840 rem_anchor_token('}');
4842 if (token.type == T_EOF) {
4843 errorf(HERE, "EOF while parsing struct");
4848 static type_t *parse_typename(void)
4850 declaration_specifiers_t specifiers;
4851 memset(&specifiers, 0, sizeof(specifiers));
4852 parse_declaration_specifiers(&specifiers);
4853 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4854 /* TODO: improve error message, user does probably not know what a
4855 * storage class is...
4857 errorf(HERE, "typename may not have a storage class");
4860 type_t *result = parse_abstract_declarator(specifiers.type);
4868 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4869 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4870 expression_t *left);
4872 typedef struct expression_parser_function_t expression_parser_function_t;
4873 struct expression_parser_function_t {
4874 unsigned precedence;
4875 parse_expression_function parser;
4876 unsigned infix_precedence;
4877 parse_expression_infix_function infix_parser;
4880 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4883 * Prints an error message if an expression was expected but not read
4885 static expression_t *expected_expression_error(void)
4887 /* skip the error message if the error token was read */
4888 if (token.type != T_ERROR) {
4889 errorf(HERE, "expected expression, got token '%K'", &token);
4893 return create_invalid_expression();
4897 * Parse a string constant.
4899 static expression_t *parse_string_const(void)
4902 if (token.type == T_STRING_LITERAL) {
4903 string_t res = token.v.string;
4905 while (token.type == T_STRING_LITERAL) {
4906 res = concat_strings(&res, &token.v.string);
4909 if (token.type != T_WIDE_STRING_LITERAL) {
4910 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4911 /* note: that we use type_char_ptr here, which is already the
4912 * automatic converted type. revert_automatic_type_conversion
4913 * will construct the array type */
4914 cnst->base.type = type_char_ptr;
4915 cnst->string.value = res;
4919 wres = concat_string_wide_string(&res, &token.v.wide_string);
4921 wres = token.v.wide_string;
4926 switch (token.type) {
4927 case T_WIDE_STRING_LITERAL:
4928 wres = concat_wide_strings(&wres, &token.v.wide_string);
4931 case T_STRING_LITERAL:
4932 wres = concat_wide_string_string(&wres, &token.v.string);
4936 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
4937 cnst->base.type = type_wchar_t_ptr;
4938 cnst->wide_string.value = wres;
4947 * Parse an integer constant.
4949 static expression_t *parse_int_const(void)
4951 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4952 cnst->base.source_position = *HERE;
4953 cnst->base.type = token.datatype;
4954 cnst->conste.v.int_value = token.v.intvalue;
4962 * Parse a character constant.
4964 static expression_t *parse_character_constant(void)
4966 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
4968 cnst->base.source_position = *HERE;
4969 cnst->base.type = token.datatype;
4970 cnst->conste.v.character = token.v.string;
4972 if (cnst->conste.v.character.size != 1) {
4973 if (warning.multichar && (c_mode & _GNUC)) {
4975 warningf(HERE, "multi-character character constant");
4977 errorf(HERE, "more than 1 characters in character constant");
4986 * Parse a wide character constant.
4988 static expression_t *parse_wide_character_constant(void)
4990 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
4992 cnst->base.source_position = *HERE;
4993 cnst->base.type = token.datatype;
4994 cnst->conste.v.wide_character = token.v.wide_string;
4996 if (cnst->conste.v.wide_character.size != 1) {
4997 if (warning.multichar && (c_mode & _GNUC)) {
4999 warningf(HERE, "multi-character character constant");
5001 errorf(HERE, "more than 1 characters in character constant");
5010 * Parse a float constant.
5012 static expression_t *parse_float_const(void)
5014 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5015 cnst->base.type = token.datatype;
5016 cnst->conste.v.float_value = token.v.floatvalue;
5023 static declaration_t *create_implicit_function(symbol_t *symbol,
5024 const source_position_t *source_position)
5026 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5027 ntype->function.return_type = type_int;
5028 ntype->function.unspecified_parameters = true;
5030 type_t *type = typehash_insert(ntype);
5031 if (type != ntype) {
5035 declaration_t *const declaration = allocate_declaration_zero();
5036 declaration->storage_class = STORAGE_CLASS_EXTERN;
5037 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5038 declaration->type = type;
5039 declaration->symbol = symbol;
5040 declaration->source_position = *source_position;
5042 bool strict_prototypes_old = warning.strict_prototypes;
5043 warning.strict_prototypes = false;
5044 record_declaration(declaration);
5045 warning.strict_prototypes = strict_prototypes_old;
5051 * Creates a return_type (func)(argument_type) function type if not
5054 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5055 type_t *argument_type2)
5057 function_parameter_t *parameter2
5058 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5059 memset(parameter2, 0, sizeof(parameter2[0]));
5060 parameter2->type = argument_type2;
5062 function_parameter_t *parameter1
5063 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5064 memset(parameter1, 0, sizeof(parameter1[0]));
5065 parameter1->type = argument_type1;
5066 parameter1->next = parameter2;
5068 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5069 type->function.return_type = return_type;
5070 type->function.parameters = parameter1;
5072 type_t *result = typehash_insert(type);
5073 if (result != type) {
5081 * Creates a return_type (func)(argument_type) function type if not
5084 * @param return_type the return type
5085 * @param argument_type the argument type
5087 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5089 function_parameter_t *parameter
5090 = obstack_alloc(type_obst, sizeof(parameter[0]));
5091 memset(parameter, 0, sizeof(parameter[0]));
5092 parameter->type = argument_type;
5094 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5095 type->function.return_type = return_type;
5096 type->function.parameters = parameter;
5098 type_t *result = typehash_insert(type);
5099 if (result != type) {
5106 static type_t *make_function_0_type(type_t *return_type)
5108 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5109 type->function.return_type = return_type;
5110 type->function.parameters = NULL;
5112 type_t *result = typehash_insert(type);
5113 if (result != type) {
5121 * Creates a function type for some function like builtins.
5123 * @param symbol the symbol describing the builtin
5125 static type_t *get_builtin_symbol_type(symbol_t *symbol)
5127 switch(symbol->ID) {
5128 case T___builtin_alloca:
5129 return make_function_1_type(type_void_ptr, type_size_t);
5130 case T___builtin_huge_val:
5131 return make_function_0_type(type_double);
5132 case T___builtin_nan:
5133 return make_function_1_type(type_double, type_char_ptr);
5134 case T___builtin_nanf:
5135 return make_function_1_type(type_float, type_char_ptr);
5136 case T___builtin_nand:
5137 return make_function_1_type(type_long_double, type_char_ptr);
5138 case T___builtin_va_end:
5139 return make_function_1_type(type_void, type_valist);
5140 case T___builtin_expect:
5141 return make_function_2_type(type_long, type_long, type_long);
5143 internal_errorf(HERE, "not implemented builtin symbol found");
5148 * Performs automatic type cast as described in § 6.3.2.1.
5150 * @param orig_type the original type
5152 static type_t *automatic_type_conversion(type_t *orig_type)
5154 type_t *type = skip_typeref(orig_type);
5155 if (is_type_array(type)) {
5156 array_type_t *array_type = &type->array;
5157 type_t *element_type = array_type->element_type;
5158 unsigned qualifiers = array_type->base.qualifiers;
5160 return make_pointer_type(element_type, qualifiers);
5163 if (is_type_function(type)) {
5164 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
5171 * reverts the automatic casts of array to pointer types and function
5172 * to function-pointer types as defined § 6.3.2.1
5174 type_t *revert_automatic_type_conversion(const expression_t *expression)
5176 switch (expression->kind) {
5177 case EXPR_REFERENCE: return expression->reference.declaration->type;
5178 case EXPR_SELECT: return expression->select.compound_entry->type;
5180 case EXPR_UNARY_DEREFERENCE: {
5181 const expression_t *const value = expression->unary.value;
5182 type_t *const type = skip_typeref(value->base.type);
5183 assert(is_type_pointer(type));
5184 return type->pointer.points_to;
5187 case EXPR_BUILTIN_SYMBOL:
5188 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
5190 case EXPR_ARRAY_ACCESS: {
5191 const expression_t *array_ref = expression->array_access.array_ref;
5192 type_t *type_left = skip_typeref(array_ref->base.type);
5193 if (!is_type_valid(type_left))
5195 assert(is_type_pointer(type_left));
5196 return type_left->pointer.points_to;
5199 case EXPR_STRING_LITERAL: {
5200 size_t size = expression->string.value.size;
5201 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
5204 case EXPR_WIDE_STRING_LITERAL: {
5205 size_t size = expression->wide_string.value.size;
5206 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
5209 case EXPR_COMPOUND_LITERAL:
5210 return expression->compound_literal.type;
5215 return expression->base.type;
5218 static expression_t *parse_reference(void)
5220 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
5222 reference_expression_t *ref = &expression->reference;
5223 symbol_t *const symbol = token.v.symbol;
5225 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
5227 source_position_t source_position = token.source_position;
5230 if (declaration == NULL) {
5231 if (! strict_mode && token.type == '(') {
5232 /* an implicitly defined function */
5233 if (warning.implicit_function_declaration) {
5234 warningf(HERE, "implicit declaration of function '%Y'",
5238 declaration = create_implicit_function(symbol,
5241 errorf(HERE, "unknown symbol '%Y' found.", symbol);
5242 return create_invalid_expression();
5246 type_t *type = declaration->type;
5248 /* we always do the auto-type conversions; the & and sizeof parser contains
5249 * code to revert this! */
5250 type = automatic_type_conversion(type);
5252 ref->declaration = declaration;
5253 ref->base.type = type;
5255 /* this declaration is used */
5256 declaration->used = true;
5258 /* check for deprecated functions */
5259 if (declaration->deprecated != 0) {
5260 const char *prefix = "";
5261 if (is_type_function(declaration->type))
5262 prefix = "function ";
5264 if (declaration->deprecated_string != NULL) {
5265 warningf(&source_position,
5266 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
5267 declaration->deprecated_string);
5269 warningf(&source_position,
5270 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
5277 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5281 /* TODO check if explicit cast is allowed and issue warnings/errors */
5284 static expression_t *parse_compound_literal(type_t *type)
5286 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5288 parse_initializer_env_t env;
5290 env.declaration = NULL;
5291 env.must_be_constant = false;
5292 initializer_t *initializer = parse_initializer(&env);
5295 expression->compound_literal.initializer = initializer;
5296 expression->compound_literal.type = type;
5297 expression->base.type = automatic_type_conversion(type);
5303 * Parse a cast expression.
5305 static expression_t *parse_cast(void)
5307 source_position_t source_position = token.source_position;
5309 type_t *type = parse_typename();
5311 /* matching add_anchor_token() is at call site */
5312 rem_anchor_token(')');
5315 if (token.type == '{') {
5316 return parse_compound_literal(type);
5319 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5320 cast->base.source_position = source_position;
5322 expression_t *value = parse_sub_expression(20);
5324 check_cast_allowed(value, type);
5326 cast->base.type = type;
5327 cast->unary.value = value;
5331 return create_invalid_expression();
5335 * Parse a statement expression.
5337 static expression_t *parse_statement_expression(void)
5339 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5341 statement_t *statement = parse_compound_statement(true);
5342 expression->statement.statement = statement;
5343 expression->base.source_position = statement->base.source_position;
5345 /* find last statement and use its type */
5346 type_t *type = type_void;
5347 const statement_t *stmt = statement->compound.statements;
5349 while (stmt->base.next != NULL)
5350 stmt = stmt->base.next;
5352 if (stmt->kind == STATEMENT_EXPRESSION) {
5353 type = stmt->expression.expression->base.type;
5356 warningf(&expression->base.source_position, "empty statement expression ({})");
5358 expression->base.type = type;
5364 return create_invalid_expression();
5368 * Parse a braced expression.
5370 static expression_t *parse_brace_expression(void)
5373 add_anchor_token(')');
5375 switch(token.type) {
5377 /* gcc extension: a statement expression */
5378 return parse_statement_expression();
5382 return parse_cast();
5384 if (is_typedef_symbol(token.v.symbol)) {
5385 return parse_cast();
5389 expression_t *result = parse_expression();
5390 rem_anchor_token(')');
5395 return create_invalid_expression();
5398 static expression_t *parse_function_keyword(void)
5403 if (current_function == NULL) {
5404 errorf(HERE, "'__func__' used outside of a function");
5407 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5408 expression->base.type = type_char_ptr;
5409 expression->funcname.kind = FUNCNAME_FUNCTION;
5414 static expression_t *parse_pretty_function_keyword(void)
5416 eat(T___PRETTY_FUNCTION__);
5418 if (current_function == NULL) {
5419 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5422 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5423 expression->base.type = type_char_ptr;
5424 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5429 static expression_t *parse_funcsig_keyword(void)
5433 if (current_function == NULL) {
5434 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5437 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5438 expression->base.type = type_char_ptr;
5439 expression->funcname.kind = FUNCNAME_FUNCSIG;
5444 static expression_t *parse_funcdname_keyword(void)
5446 eat(T___FUNCDNAME__);
5448 if (current_function == NULL) {
5449 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5452 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5453 expression->base.type = type_char_ptr;
5454 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5459 static designator_t *parse_designator(void)
5461 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5462 result->source_position = *HERE;
5464 if (token.type != T_IDENTIFIER) {
5465 parse_error_expected("while parsing member designator",
5466 T_IDENTIFIER, NULL);
5469 result->symbol = token.v.symbol;
5472 designator_t *last_designator = result;
5474 if (token.type == '.') {
5476 if (token.type != T_IDENTIFIER) {
5477 parse_error_expected("while parsing member designator",
5478 T_IDENTIFIER, NULL);
5481 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5482 designator->source_position = *HERE;
5483 designator->symbol = token.v.symbol;
5486 last_designator->next = designator;
5487 last_designator = designator;
5490 if (token.type == '[') {
5492 add_anchor_token(']');
5493 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5494 designator->source_position = *HERE;
5495 designator->array_index = parse_expression();
5496 rem_anchor_token(']');
5498 if (designator->array_index == NULL) {
5502 last_designator->next = designator;
5503 last_designator = designator;
5515 * Parse the __builtin_offsetof() expression.
5517 static expression_t *parse_offsetof(void)
5519 eat(T___builtin_offsetof);
5521 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5522 expression->base.type = type_size_t;
5525 add_anchor_token(',');
5526 type_t *type = parse_typename();
5527 rem_anchor_token(',');
5529 add_anchor_token(')');
5530 designator_t *designator = parse_designator();
5531 rem_anchor_token(')');
5534 expression->offsetofe.type = type;
5535 expression->offsetofe.designator = designator;
5538 memset(&path, 0, sizeof(path));
5539 path.top_type = type;
5540 path.path = NEW_ARR_F(type_path_entry_t, 0);
5542 descend_into_subtype(&path);
5544 if (!walk_designator(&path, designator, true)) {
5545 return create_invalid_expression();
5548 DEL_ARR_F(path.path);
5552 return create_invalid_expression();
5556 * Parses a _builtin_va_start() expression.
5558 static expression_t *parse_va_start(void)
5560 eat(T___builtin_va_start);
5562 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5565 add_anchor_token(',');
5566 expression->va_starte.ap = parse_assignment_expression();
5567 rem_anchor_token(',');
5569 expression_t *const expr = parse_assignment_expression();
5570 if (expr->kind == EXPR_REFERENCE) {
5571 declaration_t *const decl = expr->reference.declaration;
5573 return create_invalid_expression();
5574 if (decl->parent_scope == ¤t_function->scope &&
5575 decl->next == NULL) {
5576 expression->va_starte.parameter = decl;
5581 errorf(&expr->base.source_position,
5582 "second argument of 'va_start' must be last parameter of the current function");
5584 return create_invalid_expression();
5588 * Parses a _builtin_va_arg() expression.
5590 static expression_t *parse_va_arg(void)
5592 eat(T___builtin_va_arg);
5594 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5597 expression->va_arge.ap = parse_assignment_expression();
5599 expression->base.type = parse_typename();
5604 return create_invalid_expression();
5607 static expression_t *parse_builtin_symbol(void)
5609 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5611 symbol_t *symbol = token.v.symbol;
5613 expression->builtin_symbol.symbol = symbol;
5616 type_t *type = get_builtin_symbol_type(symbol);
5617 type = automatic_type_conversion(type);
5619 expression->base.type = type;
5624 * Parses a __builtin_constant() expression.
5626 static expression_t *parse_builtin_constant(void)
5628 eat(T___builtin_constant_p);
5630 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5633 add_anchor_token(')');
5634 expression->builtin_constant.value = parse_assignment_expression();
5635 rem_anchor_token(')');
5637 expression->base.type = type_int;
5641 return create_invalid_expression();
5645 * Parses a __builtin_prefetch() expression.
5647 static expression_t *parse_builtin_prefetch(void)
5649 eat(T___builtin_prefetch);
5651 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5654 add_anchor_token(')');
5655 expression->builtin_prefetch.adr = parse_assignment_expression();
5656 if (token.type == ',') {
5658 expression->builtin_prefetch.rw = parse_assignment_expression();
5660 if (token.type == ',') {
5662 expression->builtin_prefetch.locality = parse_assignment_expression();
5664 rem_anchor_token(')');
5666 expression->base.type = type_void;
5670 return create_invalid_expression();
5674 * Parses a __builtin_is_*() compare expression.
5676 static expression_t *parse_compare_builtin(void)
5678 expression_t *expression;
5680 switch(token.type) {
5681 case T___builtin_isgreater:
5682 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5684 case T___builtin_isgreaterequal:
5685 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5687 case T___builtin_isless:
5688 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5690 case T___builtin_islessequal:
5691 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5693 case T___builtin_islessgreater:
5694 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5696 case T___builtin_isunordered:
5697 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5700 internal_errorf(HERE, "invalid compare builtin found");
5703 expression->base.source_position = *HERE;
5707 expression->binary.left = parse_assignment_expression();
5709 expression->binary.right = parse_assignment_expression();
5712 type_t *const orig_type_left = expression->binary.left->base.type;
5713 type_t *const orig_type_right = expression->binary.right->base.type;
5715 type_t *const type_left = skip_typeref(orig_type_left);
5716 type_t *const type_right = skip_typeref(orig_type_right);
5717 if (!is_type_float(type_left) && !is_type_float(type_right)) {
5718 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5719 type_error_incompatible("invalid operands in comparison",
5720 &expression->base.source_position, orig_type_left, orig_type_right);
5723 semantic_comparison(&expression->binary);
5728 return create_invalid_expression();
5733 * Parses a __builtin_expect() expression.
5735 static expression_t *parse_builtin_expect(void)
5737 eat(T___builtin_expect);
5739 expression_t *expression
5740 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5743 expression->binary.left = parse_assignment_expression();
5745 expression->binary.right = parse_constant_expression();
5748 expression->base.type = expression->binary.left->base.type;
5752 return create_invalid_expression();
5757 * Parses a MS assume() expression.
5759 static expression_t *parse_assume(void) {
5762 expression_t *expression
5763 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5766 add_anchor_token(')');
5767 expression->unary.value = parse_assignment_expression();
5768 rem_anchor_token(')');
5771 expression->base.type = type_void;
5774 return create_invalid_expression();
5778 * Parse a microsoft __noop expression.
5780 static expression_t *parse_noop_expression(void) {
5781 source_position_t source_position = *HERE;
5784 if (token.type == '(') {
5785 /* parse arguments */
5787 add_anchor_token(')');
5788 add_anchor_token(',');
5790 if (token.type != ')') {
5792 (void)parse_assignment_expression();
5793 if (token.type != ',')
5799 rem_anchor_token(',');
5800 rem_anchor_token(')');
5803 /* the result is a (int)0 */
5804 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5805 cnst->base.source_position = source_position;
5806 cnst->base.type = type_int;
5807 cnst->conste.v.int_value = 0;
5808 cnst->conste.is_ms_noop = true;
5813 return create_invalid_expression();
5817 * Parses a primary expression.
5819 static expression_t *parse_primary_expression(void)
5821 switch (token.type) {
5822 case T_INTEGER: return parse_int_const();
5823 case T_CHARACTER_CONSTANT: return parse_character_constant();
5824 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5825 case T_FLOATINGPOINT: return parse_float_const();
5826 case T_STRING_LITERAL:
5827 case T_WIDE_STRING_LITERAL: return parse_string_const();
5828 case T_IDENTIFIER: return parse_reference();
5829 case T___FUNCTION__:
5830 case T___func__: return parse_function_keyword();
5831 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5832 case T___FUNCSIG__: return parse_funcsig_keyword();
5833 case T___FUNCDNAME__: return parse_funcdname_keyword();
5834 case T___builtin_offsetof: return parse_offsetof();
5835 case T___builtin_va_start: return parse_va_start();
5836 case T___builtin_va_arg: return parse_va_arg();
5837 case T___builtin_expect:
5838 case T___builtin_alloca:
5839 case T___builtin_nan:
5840 case T___builtin_nand:
5841 case T___builtin_nanf:
5842 case T___builtin_huge_val:
5843 case T___builtin_va_end: return parse_builtin_symbol();
5844 case T___builtin_isgreater:
5845 case T___builtin_isgreaterequal:
5846 case T___builtin_isless:
5847 case T___builtin_islessequal:
5848 case T___builtin_islessgreater:
5849 case T___builtin_isunordered: return parse_compare_builtin();
5850 case T___builtin_constant_p: return parse_builtin_constant();
5851 case T___builtin_prefetch: return parse_builtin_prefetch();
5852 case T__assume: return parse_assume();
5854 case '(': return parse_brace_expression();
5855 case T___noop: return parse_noop_expression();
5858 errorf(HERE, "unexpected token %K, expected an expression", &token);
5859 return create_invalid_expression();
5863 * Check if the expression has the character type and issue a warning then.
5865 static void check_for_char_index_type(const expression_t *expression) {
5866 type_t *const type = expression->base.type;
5867 const type_t *const base_type = skip_typeref(type);
5869 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5870 warning.char_subscripts) {
5871 warningf(&expression->base.source_position,
5872 "array subscript has type '%T'", type);
5876 static expression_t *parse_array_expression(unsigned precedence,
5882 add_anchor_token(']');
5884 expression_t *inside = parse_expression();
5886 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5888 array_access_expression_t *array_access = &expression->array_access;
5890 type_t *const orig_type_left = left->base.type;
5891 type_t *const orig_type_inside = inside->base.type;
5893 type_t *const type_left = skip_typeref(orig_type_left);
5894 type_t *const type_inside = skip_typeref(orig_type_inside);
5896 type_t *return_type;
5897 if (is_type_pointer(type_left)) {
5898 return_type = type_left->pointer.points_to;
5899 array_access->array_ref = left;
5900 array_access->index = inside;
5901 check_for_char_index_type(inside);
5902 } else if (is_type_pointer(type_inside)) {
5903 return_type = type_inside->pointer.points_to;
5904 array_access->array_ref = inside;
5905 array_access->index = left;
5906 array_access->flipped = true;
5907 check_for_char_index_type(left);
5909 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5911 "array access on object with non-pointer types '%T', '%T'",
5912 orig_type_left, orig_type_inside);
5914 return_type = type_error_type;
5915 array_access->array_ref = create_invalid_expression();
5918 rem_anchor_token(']');
5919 if (token.type != ']') {
5920 parse_error_expected("Problem while parsing array access", ']', NULL);
5925 return_type = automatic_type_conversion(return_type);
5926 expression->base.type = return_type;
5931 static expression_t *parse_typeprop(expression_kind_t const kind,
5932 source_position_t const pos,
5933 unsigned const precedence)
5935 expression_t *tp_expression = allocate_expression_zero(kind);
5936 tp_expression->base.type = type_size_t;
5937 tp_expression->base.source_position = pos;
5939 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
5941 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
5943 add_anchor_token(')');
5944 type_t* const orig_type = parse_typename();
5945 tp_expression->typeprop.type = orig_type;
5947 type_t const* const type = skip_typeref(orig_type);
5948 char const* const wrong_type =
5949 is_type_incomplete(type) ? "incomplete" :
5950 type->kind == TYPE_FUNCTION ? "function designator" :
5951 type->kind == TYPE_BITFIELD ? "bitfield" :
5953 if (wrong_type != NULL) {
5954 errorf(&pos, "operand of %s expression must not be %s type '%T'",
5955 what, wrong_type, type);
5958 rem_anchor_token(')');
5961 expression_t *expression = parse_sub_expression(precedence);
5963 type_t* const orig_type = revert_automatic_type_conversion(expression);
5964 expression->base.type = orig_type;
5966 type_t const* const type = skip_typeref(orig_type);
5967 char const* const wrong_type =
5968 is_type_incomplete(type) ? "incomplete" :
5969 type->kind == TYPE_FUNCTION ? "function designator" :
5970 type->kind == TYPE_BITFIELD ? "bitfield" :
5972 if (wrong_type != NULL) {
5973 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
5976 tp_expression->typeprop.type = expression->base.type;
5977 tp_expression->typeprop.tp_expression = expression;
5980 return tp_expression;
5982 return create_invalid_expression();
5985 static expression_t *parse_sizeof(unsigned precedence)
5987 source_position_t pos = *HERE;
5989 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
5992 static expression_t *parse_alignof(unsigned precedence)
5994 source_position_t pos = *HERE;
5996 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
5999 static expression_t *parse_select_expression(unsigned precedence,
6000 expression_t *compound)
6003 assert(token.type == '.' || token.type == T_MINUSGREATER);
6005 bool is_pointer = (token.type == T_MINUSGREATER);
6008 expression_t *select = allocate_expression_zero(EXPR_SELECT);
6009 select->select.compound = compound;
6011 if (token.type != T_IDENTIFIER) {
6012 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
6015 symbol_t *symbol = token.v.symbol;
6016 select->select.symbol = symbol;
6019 type_t *const orig_type = compound->base.type;
6020 type_t *const type = skip_typeref(orig_type);
6022 type_t *type_left = type;
6024 if (!is_type_pointer(type)) {
6025 if (is_type_valid(type)) {
6026 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
6028 return create_invalid_expression();
6030 type_left = type->pointer.points_to;
6032 type_left = skip_typeref(type_left);
6034 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
6035 type_left->kind != TYPE_COMPOUND_UNION) {
6036 if (is_type_valid(type_left)) {
6037 errorf(HERE, "request for member '%Y' in something not a struct or "
6038 "union, but '%T'", symbol, type_left);
6040 return create_invalid_expression();
6043 declaration_t *const declaration = type_left->compound.declaration;
6045 if (!declaration->init.complete) {
6046 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
6048 return create_invalid_expression();
6051 declaration_t *iter = find_compound_entry(declaration, symbol);
6053 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
6054 return create_invalid_expression();
6057 /* we always do the auto-type conversions; the & and sizeof parser contains
6058 * code to revert this! */
6059 type_t *expression_type = automatic_type_conversion(iter->type);
6061 select->select.compound_entry = iter;
6062 select->base.type = expression_type;
6064 type_t *skipped = skip_typeref(iter->type);
6065 if (skipped->kind == TYPE_BITFIELD) {
6066 select->base.type = skipped->bitfield.base_type;
6072 static void check_call_argument(const function_parameter_t *parameter,
6073 call_argument_t *argument)
6075 type_t *expected_type = parameter->type;
6076 type_t *expected_type_skip = skip_typeref(expected_type);
6077 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
6078 expression_t *arg_expr = argument->expression;
6080 /* handle transparent union gnu extension */
6081 if (is_type_union(expected_type_skip)
6082 && (expected_type_skip->base.modifiers
6083 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
6084 declaration_t *union_decl = expected_type_skip->compound.declaration;
6086 declaration_t *declaration = union_decl->scope.declarations;
6087 type_t *best_type = NULL;
6088 for ( ; declaration != NULL; declaration = declaration->next) {
6089 type_t *decl_type = declaration->type;
6090 error = semantic_assign(decl_type, arg_expr);
6091 if (error == ASSIGN_ERROR_INCOMPATIBLE
6092 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
6095 if (error == ASSIGN_SUCCESS) {
6096 best_type = decl_type;
6097 } else if (best_type == NULL) {
6098 best_type = decl_type;
6102 if (best_type != NULL) {
6103 expected_type = best_type;
6107 error = semantic_assign(expected_type, arg_expr);
6108 argument->expression = create_implicit_cast(argument->expression,
6111 /* TODO report exact scope in error messages (like "in 3rd parameter") */
6112 report_assign_error(error, expected_type, arg_expr, "function call",
6113 &arg_expr->base.source_position);
6117 * Parse a call expression, ie. expression '( ... )'.
6119 * @param expression the function address
6121 static expression_t *parse_call_expression(unsigned precedence,
6122 expression_t *expression)
6125 expression_t *result = allocate_expression_zero(EXPR_CALL);
6126 result->base.source_position = expression->base.source_position;
6128 call_expression_t *call = &result->call;
6129 call->function = expression;
6131 type_t *const orig_type = expression->base.type;
6132 type_t *const type = skip_typeref(orig_type);
6134 function_type_t *function_type = NULL;
6135 if (is_type_pointer(type)) {
6136 type_t *const to_type = skip_typeref(type->pointer.points_to);
6138 if (is_type_function(to_type)) {
6139 function_type = &to_type->function;
6140 call->base.type = function_type->return_type;
6144 if (function_type == NULL && is_type_valid(type)) {
6145 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
6148 /* parse arguments */
6150 add_anchor_token(')');
6151 add_anchor_token(',');
6153 if (token.type != ')') {
6154 call_argument_t *last_argument = NULL;
6157 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
6159 argument->expression = parse_assignment_expression();
6160 if (last_argument == NULL) {
6161 call->arguments = argument;
6163 last_argument->next = argument;
6165 last_argument = argument;
6167 if (token.type != ',')
6172 rem_anchor_token(',');
6173 rem_anchor_token(')');
6176 if (function_type == NULL)
6179 function_parameter_t *parameter = function_type->parameters;
6180 call_argument_t *argument = call->arguments;
6181 if (!function_type->unspecified_parameters) {
6182 for( ; parameter != NULL && argument != NULL;
6183 parameter = parameter->next, argument = argument->next) {
6184 check_call_argument(parameter, argument);
6187 if (parameter != NULL) {
6188 errorf(HERE, "too few arguments to function '%E'", expression);
6189 } else if (argument != NULL && !function_type->variadic) {
6190 errorf(HERE, "too many arguments to function '%E'", expression);
6194 /* do default promotion */
6195 for( ; argument != NULL; argument = argument->next) {
6196 type_t *type = argument->expression->base.type;
6198 type = get_default_promoted_type(type);
6200 argument->expression
6201 = create_implicit_cast(argument->expression, type);
6204 check_format(&result->call);
6208 return create_invalid_expression();
6211 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
6213 static bool same_compound_type(const type_t *type1, const type_t *type2)
6216 is_type_compound(type1) &&
6217 type1->kind == type2->kind &&
6218 type1->compound.declaration == type2->compound.declaration;
6222 * Parse a conditional expression, ie. 'expression ? ... : ...'.
6224 * @param expression the conditional expression
6226 static expression_t *parse_conditional_expression(unsigned precedence,
6227 expression_t *expression)
6230 add_anchor_token(':');
6232 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
6234 conditional_expression_t *conditional = &result->conditional;
6235 conditional->condition = expression;
6238 type_t *const condition_type_orig = expression->base.type;
6239 type_t *const condition_type = skip_typeref(condition_type_orig);
6240 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
6241 type_error("expected a scalar type in conditional condition",
6242 &expression->base.source_position, condition_type_orig);
6245 expression_t *true_expression = parse_expression();
6246 rem_anchor_token(':');
6248 expression_t *false_expression = parse_sub_expression(precedence);
6250 type_t *const orig_true_type = true_expression->base.type;
6251 type_t *const orig_false_type = false_expression->base.type;
6252 type_t *const true_type = skip_typeref(orig_true_type);
6253 type_t *const false_type = skip_typeref(orig_false_type);
6256 type_t *result_type;
6257 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
6258 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6259 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
6260 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
6261 warningf(&expression->base.source_position,
6262 "ISO C forbids conditional expression with only one void side");
6264 result_type = type_void;
6265 } else if (is_type_arithmetic(true_type)
6266 && is_type_arithmetic(false_type)) {
6267 result_type = semantic_arithmetic(true_type, false_type);
6269 true_expression = create_implicit_cast(true_expression, result_type);
6270 false_expression = create_implicit_cast(false_expression, result_type);
6272 conditional->true_expression = true_expression;
6273 conditional->false_expression = false_expression;
6274 conditional->base.type = result_type;
6275 } else if (same_compound_type(true_type, false_type)) {
6276 /* just take 1 of the 2 types */
6277 result_type = true_type;
6278 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
6279 type_t *pointer_type;
6281 expression_t *other_expression;
6282 if (is_type_pointer(true_type) &&
6283 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
6284 pointer_type = true_type;
6285 other_type = false_type;
6286 other_expression = false_expression;
6288 pointer_type = false_type;
6289 other_type = true_type;
6290 other_expression = true_expression;
6293 if (is_null_pointer_constant(other_expression)) {
6294 result_type = pointer_type;
6295 } else if (is_type_pointer(other_type)) {
6296 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
6297 type_t *to2 = skip_typeref(other_type->pointer.points_to);
6300 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
6301 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
6303 } else if (types_compatible(get_unqualified_type(to1),
6304 get_unqualified_type(to2))) {
6307 warningf(&expression->base.source_position,
6308 "pointer types '%T' and '%T' in conditional expression are incompatible",
6309 true_type, false_type);
6313 type_t *const copy = duplicate_type(to);
6314 copy->base.qualifiers = to1->base.qualifiers | to2->base.qualifiers;
6316 type_t *const type = typehash_insert(copy);
6320 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
6321 } else if (is_type_integer(other_type)) {
6322 warningf(&expression->base.source_position,
6323 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
6324 result_type = pointer_type;
6326 type_error_incompatible("while parsing conditional",
6327 &expression->base.source_position, true_type, false_type);
6328 result_type = type_error_type;
6331 /* TODO: one pointer to void*, other some pointer */
6333 if (is_type_valid(true_type) && is_type_valid(false_type)) {
6334 type_error_incompatible("while parsing conditional",
6335 &expression->base.source_position, true_type,
6338 result_type = type_error_type;
6341 conditional->true_expression
6342 = create_implicit_cast(true_expression, result_type);
6343 conditional->false_expression
6344 = create_implicit_cast(false_expression, result_type);
6345 conditional->base.type = result_type;
6348 return create_invalid_expression();
6352 * Parse an extension expression.
6354 static expression_t *parse_extension(unsigned precedence)
6356 eat(T___extension__);
6358 /* TODO enable extensions */
6359 expression_t *expression = parse_sub_expression(precedence);
6360 /* TODO disable extensions */
6365 * Parse a __builtin_classify_type() expression.
6367 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6369 eat(T___builtin_classify_type);
6371 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6372 result->base.type = type_int;
6375 add_anchor_token(')');
6376 expression_t *expression = parse_sub_expression(precedence);
6377 rem_anchor_token(')');
6379 result->classify_type.type_expression = expression;
6383 return create_invalid_expression();
6386 static void check_pointer_arithmetic(const source_position_t *source_position,
6387 type_t *pointer_type,
6388 type_t *orig_pointer_type)
6390 type_t *points_to = pointer_type->pointer.points_to;
6391 points_to = skip_typeref(points_to);
6393 if (is_type_incomplete(points_to) &&
6395 || !is_type_atomic(points_to, ATOMIC_TYPE_VOID))) {
6396 errorf(source_position,
6397 "arithmetic with pointer to incomplete type '%T' not allowed",
6399 } else if (is_type_function(points_to)) {
6400 errorf(source_position,
6401 "arithmetic with pointer to function type '%T' not allowed",
6406 static void semantic_incdec(unary_expression_t *expression)
6408 type_t *const orig_type = expression->value->base.type;
6409 type_t *const type = skip_typeref(orig_type);
6410 if (is_type_pointer(type)) {
6411 check_pointer_arithmetic(&expression->base.source_position,
6413 } else if (!is_type_real(type) && is_type_valid(type)) {
6414 /* TODO: improve error message */
6415 errorf(HERE, "operation needs an arithmetic or pointer type");
6417 expression->base.type = orig_type;
6420 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6422 type_t *const orig_type = expression->value->base.type;
6423 type_t *const type = skip_typeref(orig_type);
6424 if (!is_type_arithmetic(type)) {
6425 if (is_type_valid(type)) {
6426 /* TODO: improve error message */
6427 errorf(HERE, "operation needs an arithmetic type");
6432 expression->base.type = orig_type;
6435 static void semantic_unexpr_scalar(unary_expression_t *expression)
6437 type_t *const orig_type = expression->value->base.type;
6438 type_t *const type = skip_typeref(orig_type);
6439 if (!is_type_scalar(type)) {
6440 if (is_type_valid(type)) {
6441 errorf(HERE, "operand of ! must be of scalar type");
6446 expression->base.type = orig_type;
6449 static void semantic_unexpr_integer(unary_expression_t *expression)
6451 type_t *const orig_type = expression->value->base.type;
6452 type_t *const type = skip_typeref(orig_type);
6453 if (!is_type_integer(type)) {
6454 if (is_type_valid(type)) {
6455 errorf(HERE, "operand of ~ must be of integer type");
6460 expression->base.type = orig_type;
6463 static void semantic_dereference(unary_expression_t *expression)
6465 type_t *const orig_type = expression->value->base.type;
6466 type_t *const type = skip_typeref(orig_type);
6467 if (!is_type_pointer(type)) {
6468 if (is_type_valid(type)) {
6469 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6474 type_t *result_type = type->pointer.points_to;
6475 result_type = automatic_type_conversion(result_type);
6476 expression->base.type = result_type;
6479 static void set_address_taken(expression_t *expression, bool may_be_register)
6481 if (expression->kind != EXPR_REFERENCE)
6484 declaration_t *const declaration = expression->reference.declaration;
6485 /* happens for parse errors */
6486 if (declaration == NULL)
6489 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
6490 errorf(&expression->base.source_position,
6491 "address of register variable '%Y' requested",
6492 declaration->symbol);
6494 declaration->address_taken = 1;
6499 * Check the semantic of the address taken expression.
6501 static void semantic_take_addr(unary_expression_t *expression)
6503 expression_t *value = expression->value;
6504 value->base.type = revert_automatic_type_conversion(value);
6506 type_t *orig_type = value->base.type;
6507 if (!is_type_valid(orig_type))
6510 set_address_taken(value, false);
6512 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6515 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6516 static expression_t *parse_##unexpression_type(unsigned precedence) \
6520 expression_t *unary_expression \
6521 = allocate_expression_zero(unexpression_type); \
6522 unary_expression->base.source_position = *HERE; \
6523 unary_expression->unary.value = parse_sub_expression(precedence); \
6525 sfunc(&unary_expression->unary); \
6527 return unary_expression; \
6530 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6531 semantic_unexpr_arithmetic)
6532 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6533 semantic_unexpr_arithmetic)
6534 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6535 semantic_unexpr_scalar)
6536 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6537 semantic_dereference)
6538 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6540 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6541 semantic_unexpr_integer)
6542 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6544 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6547 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6549 static expression_t *parse_##unexpression_type(unsigned precedence, \
6550 expression_t *left) \
6552 (void) precedence; \
6555 expression_t *unary_expression \
6556 = allocate_expression_zero(unexpression_type); \
6557 unary_expression->unary.value = left; \
6559 sfunc(&unary_expression->unary); \
6561 return unary_expression; \
6564 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6565 EXPR_UNARY_POSTFIX_INCREMENT,
6567 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6568 EXPR_UNARY_POSTFIX_DECREMENT,
6571 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6573 /* TODO: handle complex + imaginary types */
6575 /* § 6.3.1.8 Usual arithmetic conversions */
6576 if (type_left == type_long_double || type_right == type_long_double) {
6577 return type_long_double;
6578 } else if (type_left == type_double || type_right == type_double) {
6580 } else if (type_left == type_float || type_right == type_float) {
6584 type_right = promote_integer(type_right);
6585 type_left = promote_integer(type_left);
6587 if (type_left == type_right)
6590 bool signed_left = is_type_signed(type_left);
6591 bool signed_right = is_type_signed(type_right);
6592 int rank_left = get_rank(type_left);
6593 int rank_right = get_rank(type_right);
6594 if (rank_left < rank_right) {
6595 if (signed_left == signed_right || !signed_right) {
6601 if (signed_left == signed_right || !signed_left) {
6610 * Check the semantic restrictions for a binary expression.
6612 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6614 expression_t *const left = expression->left;
6615 expression_t *const right = expression->right;
6616 type_t *const orig_type_left = left->base.type;
6617 type_t *const orig_type_right = right->base.type;
6618 type_t *const type_left = skip_typeref(orig_type_left);
6619 type_t *const type_right = skip_typeref(orig_type_right);
6621 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6622 /* TODO: improve error message */
6623 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6624 errorf(HERE, "operation needs arithmetic types");
6629 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6630 expression->left = create_implicit_cast(left, arithmetic_type);
6631 expression->right = create_implicit_cast(right, arithmetic_type);
6632 expression->base.type = arithmetic_type;
6635 static void semantic_shift_op(binary_expression_t *expression)
6637 expression_t *const left = expression->left;
6638 expression_t *const right = expression->right;
6639 type_t *const orig_type_left = left->base.type;
6640 type_t *const orig_type_right = right->base.type;
6641 type_t * type_left = skip_typeref(orig_type_left);
6642 type_t * type_right = skip_typeref(orig_type_right);
6644 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
6645 /* TODO: improve error message */
6646 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6647 errorf(HERE, "operation needs integer types");
6652 type_left = promote_integer(type_left);
6653 type_right = promote_integer(type_right);
6655 expression->left = create_implicit_cast(left, type_left);
6656 expression->right = create_implicit_cast(right, type_right);
6657 expression->base.type = type_left;
6660 static void semantic_add(binary_expression_t *expression)
6662 expression_t *const left = expression->left;
6663 expression_t *const right = expression->right;
6664 type_t *const orig_type_left = left->base.type;
6665 type_t *const orig_type_right = right->base.type;
6666 type_t *const type_left = skip_typeref(orig_type_left);
6667 type_t *const type_right = skip_typeref(orig_type_right);
6670 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6671 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6672 expression->left = create_implicit_cast(left, arithmetic_type);
6673 expression->right = create_implicit_cast(right, arithmetic_type);
6674 expression->base.type = arithmetic_type;
6676 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6677 check_pointer_arithmetic(&expression->base.source_position,
6678 type_left, orig_type_left);
6679 expression->base.type = type_left;
6680 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
6681 check_pointer_arithmetic(&expression->base.source_position,
6682 type_right, orig_type_right);
6683 expression->base.type = type_right;
6684 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6685 errorf(&expression->base.source_position,
6686 "invalid operands to binary + ('%T', '%T')",
6687 orig_type_left, orig_type_right);
6691 static void semantic_sub(binary_expression_t *expression)
6693 expression_t *const left = expression->left;
6694 expression_t *const right = expression->right;
6695 type_t *const orig_type_left = left->base.type;
6696 type_t *const orig_type_right = right->base.type;
6697 type_t *const type_left = skip_typeref(orig_type_left);
6698 type_t *const type_right = skip_typeref(orig_type_right);
6701 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6702 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6703 expression->left = create_implicit_cast(left, arithmetic_type);
6704 expression->right = create_implicit_cast(right, arithmetic_type);
6705 expression->base.type = arithmetic_type;
6707 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6708 check_pointer_arithmetic(&expression->base.source_position,
6709 type_left, orig_type_left);
6710 expression->base.type = type_left;
6711 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6712 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
6713 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
6714 if (!types_compatible(unqual_left, unqual_right)) {
6715 errorf(&expression->base.source_position,
6716 "subtracting pointers to incompatible types '%T' and '%T'",
6717 orig_type_left, orig_type_right);
6718 } else if (!is_type_object(unqual_left)) {
6719 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
6720 warningf(&expression->base.source_position,
6721 "subtracting pointers to void");
6723 errorf(&expression->base.source_position,
6724 "subtracting pointers to non-object types '%T'",
6728 expression->base.type = type_ptrdiff_t;
6729 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6730 errorf(HERE, "invalid operands of types '%T' and '%T' to binary '-'",
6731 orig_type_left, orig_type_right);
6736 * Check the semantics of comparison expressions.
6738 * @param expression The expression to check.
6740 static void semantic_comparison(binary_expression_t *expression)
6742 expression_t *left = expression->left;
6743 expression_t *right = expression->right;
6744 type_t *orig_type_left = left->base.type;
6745 type_t *orig_type_right = right->base.type;
6747 type_t *type_left = skip_typeref(orig_type_left);
6748 type_t *type_right = skip_typeref(orig_type_right);
6750 /* TODO non-arithmetic types */
6751 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6752 /* test for signed vs unsigned compares */
6753 if (warning.sign_compare &&
6754 (expression->base.kind != EXPR_BINARY_EQUAL &&
6755 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6756 (is_type_signed(type_left) != is_type_signed(type_right))) {
6758 /* check if 1 of the operands is a constant, in this case we just
6759 * check wether we can safely represent the resulting constant in
6760 * the type of the other operand. */
6761 expression_t *const_expr = NULL;
6762 expression_t *other_expr = NULL;
6764 if (is_constant_expression(left)) {
6767 } else if (is_constant_expression(right)) {
6772 if (const_expr != NULL) {
6773 type_t *other_type = skip_typeref(other_expr->base.type);
6774 long val = fold_constant(const_expr);
6775 /* TODO: check if val can be represented by other_type */
6779 warningf(&expression->base.source_position,
6780 "comparison between signed and unsigned");
6782 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6783 expression->left = create_implicit_cast(left, arithmetic_type);
6784 expression->right = create_implicit_cast(right, arithmetic_type);
6785 expression->base.type = arithmetic_type;
6786 if (warning.float_equal &&
6787 (expression->base.kind == EXPR_BINARY_EQUAL ||
6788 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6789 is_type_float(arithmetic_type)) {
6790 warningf(&expression->base.source_position,
6791 "comparing floating point with == or != is unsafe");
6793 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6794 /* TODO check compatibility */
6795 } else if (is_type_pointer(type_left)) {
6796 expression->right = create_implicit_cast(right, type_left);
6797 } else if (is_type_pointer(type_right)) {
6798 expression->left = create_implicit_cast(left, type_right);
6799 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6800 type_error_incompatible("invalid operands in comparison",
6801 &expression->base.source_position,
6802 type_left, type_right);
6804 expression->base.type = type_int;
6808 * Checks if a compound type has constant fields.
6810 static bool has_const_fields(const compound_type_t *type)
6812 const scope_t *scope = &type->declaration->scope;
6813 const declaration_t *declaration = scope->declarations;
6815 for (; declaration != NULL; declaration = declaration->next) {
6816 if (declaration->namespc != NAMESPACE_NORMAL)
6819 const type_t *decl_type = skip_typeref(declaration->type);
6820 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6827 static bool is_lvalue(const expression_t *expression)
6829 switch (expression->kind) {
6830 case EXPR_REFERENCE:
6831 case EXPR_ARRAY_ACCESS:
6833 case EXPR_UNARY_DEREFERENCE:
6841 static bool is_valid_assignment_lhs(expression_t const* const left)
6843 type_t *const orig_type_left = revert_automatic_type_conversion(left);
6844 type_t *const type_left = skip_typeref(orig_type_left);
6846 if (!is_lvalue(left)) {
6847 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
6852 if (is_type_array(type_left)) {
6853 errorf(HERE, "cannot assign to arrays ('%E')", left);
6856 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6857 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6861 if (is_type_incomplete(type_left)) {
6862 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
6863 left, orig_type_left);
6866 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6867 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6868 left, orig_type_left);
6875 static void semantic_arithmetic_assign(binary_expression_t *expression)
6877 expression_t *left = expression->left;
6878 expression_t *right = expression->right;
6879 type_t *orig_type_left = left->base.type;
6880 type_t *orig_type_right = right->base.type;
6882 if (!is_valid_assignment_lhs(left))
6885 type_t *type_left = skip_typeref(orig_type_left);
6886 type_t *type_right = skip_typeref(orig_type_right);
6888 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6889 /* TODO: improve error message */
6890 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6891 errorf(HERE, "operation needs arithmetic types");
6896 /* combined instructions are tricky. We can't create an implicit cast on
6897 * the left side, because we need the uncasted form for the store.
6898 * The ast2firm pass has to know that left_type must be right_type
6899 * for the arithmetic operation and create a cast by itself */
6900 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6901 expression->right = create_implicit_cast(right, arithmetic_type);
6902 expression->base.type = type_left;
6905 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
6907 expression_t *const left = expression->left;
6908 expression_t *const right = expression->right;
6909 type_t *const orig_type_left = left->base.type;
6910 type_t *const orig_type_right = right->base.type;
6911 type_t *const type_left = skip_typeref(orig_type_left);
6912 type_t *const type_right = skip_typeref(orig_type_right);
6914 if (!is_valid_assignment_lhs(left))
6917 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6918 /* combined instructions are tricky. We can't create an implicit cast on
6919 * the left side, because we need the uncasted form for the store.
6920 * The ast2firm pass has to know that left_type must be right_type
6921 * for the arithmetic operation and create a cast by itself */
6922 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
6923 expression->right = create_implicit_cast(right, arithmetic_type);
6924 expression->base.type = type_left;
6925 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6926 check_pointer_arithmetic(&expression->base.source_position,
6927 type_left, orig_type_left);
6928 expression->base.type = type_left;
6929 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6930 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
6935 * Check the semantic restrictions of a logical expression.
6937 static void semantic_logical_op(binary_expression_t *expression)
6939 expression_t *const left = expression->left;
6940 expression_t *const right = expression->right;
6941 type_t *const orig_type_left = left->base.type;
6942 type_t *const orig_type_right = right->base.type;
6943 type_t *const type_left = skip_typeref(orig_type_left);
6944 type_t *const type_right = skip_typeref(orig_type_right);
6946 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
6947 /* TODO: improve error message */
6948 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6949 errorf(HERE, "operation needs scalar types");
6954 expression->base.type = type_int;
6958 * Check the semantic restrictions of a binary assign expression.
6960 static void semantic_binexpr_assign(binary_expression_t *expression)
6962 expression_t *left = expression->left;
6963 type_t *orig_type_left = left->base.type;
6965 type_t *type_left = revert_automatic_type_conversion(left);
6966 type_left = skip_typeref(orig_type_left);
6968 if (!is_valid_assignment_lhs(left))
6971 assign_error_t error = semantic_assign(orig_type_left, expression->right);
6972 report_assign_error(error, orig_type_left, expression->right,
6973 "assignment", &left->base.source_position);
6974 expression->right = create_implicit_cast(expression->right, orig_type_left);
6975 expression->base.type = orig_type_left;
6979 * Determine if the outermost operation (or parts thereof) of the given
6980 * expression has no effect in order to generate a warning about this fact.
6981 * Therefore in some cases this only examines some of the operands of the
6982 * expression (see comments in the function and examples below).
6984 * f() + 23; // warning, because + has no effect
6985 * x || f(); // no warning, because x controls execution of f()
6986 * x ? y : f(); // warning, because y has no effect
6987 * (void)x; // no warning to be able to suppress the warning
6988 * This function can NOT be used for an "expression has definitely no effect"-
6990 static bool expression_has_effect(const expression_t *const expr)
6992 switch (expr->kind) {
6993 case EXPR_UNKNOWN: break;
6994 case EXPR_INVALID: return true; /* do NOT warn */
6995 case EXPR_REFERENCE: return false;
6996 /* suppress the warning for microsoft __noop operations */
6997 case EXPR_CONST: return expr->conste.is_ms_noop;
6998 case EXPR_CHARACTER_CONSTANT: return false;
6999 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
7000 case EXPR_STRING_LITERAL: return false;
7001 case EXPR_WIDE_STRING_LITERAL: return false;
7004 const call_expression_t *const call = &expr->call;
7005 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
7008 switch (call->function->builtin_symbol.symbol->ID) {
7009 case T___builtin_va_end: return true;
7010 default: return false;
7014 /* Generate the warning if either the left or right hand side of a
7015 * conditional expression has no effect */
7016 case EXPR_CONDITIONAL: {
7017 const conditional_expression_t *const cond = &expr->conditional;
7019 expression_has_effect(cond->true_expression) &&
7020 expression_has_effect(cond->false_expression);
7023 case EXPR_SELECT: return false;
7024 case EXPR_ARRAY_ACCESS: return false;
7025 case EXPR_SIZEOF: return false;
7026 case EXPR_CLASSIFY_TYPE: return false;
7027 case EXPR_ALIGNOF: return false;
7029 case EXPR_FUNCNAME: return false;
7030 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
7031 case EXPR_BUILTIN_CONSTANT_P: return false;
7032 case EXPR_BUILTIN_PREFETCH: return true;
7033 case EXPR_OFFSETOF: return false;
7034 case EXPR_VA_START: return true;
7035 case EXPR_VA_ARG: return true;
7036 case EXPR_STATEMENT: return true; // TODO
7037 case EXPR_COMPOUND_LITERAL: return false;
7039 case EXPR_UNARY_NEGATE: return false;
7040 case EXPR_UNARY_PLUS: return false;
7041 case EXPR_UNARY_BITWISE_NEGATE: return false;
7042 case EXPR_UNARY_NOT: return false;
7043 case EXPR_UNARY_DEREFERENCE: return false;
7044 case EXPR_UNARY_TAKE_ADDRESS: return false;
7045 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
7046 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
7047 case EXPR_UNARY_PREFIX_INCREMENT: return true;
7048 case EXPR_UNARY_PREFIX_DECREMENT: return true;
7050 /* Treat void casts as if they have an effect in order to being able to
7051 * suppress the warning */
7052 case EXPR_UNARY_CAST: {
7053 type_t *const type = skip_typeref(expr->base.type);
7054 return is_type_atomic(type, ATOMIC_TYPE_VOID);
7057 case EXPR_UNARY_CAST_IMPLICIT: return true;
7058 case EXPR_UNARY_ASSUME: return true;
7060 case EXPR_BINARY_ADD: return false;
7061 case EXPR_BINARY_SUB: return false;
7062 case EXPR_BINARY_MUL: return false;
7063 case EXPR_BINARY_DIV: return false;
7064 case EXPR_BINARY_MOD: return false;
7065 case EXPR_BINARY_EQUAL: return false;
7066 case EXPR_BINARY_NOTEQUAL: return false;
7067 case EXPR_BINARY_LESS: return false;
7068 case EXPR_BINARY_LESSEQUAL: return false;
7069 case EXPR_BINARY_GREATER: return false;
7070 case EXPR_BINARY_GREATEREQUAL: return false;
7071 case EXPR_BINARY_BITWISE_AND: return false;
7072 case EXPR_BINARY_BITWISE_OR: return false;
7073 case EXPR_BINARY_BITWISE_XOR: return false;
7074 case EXPR_BINARY_SHIFTLEFT: return false;
7075 case EXPR_BINARY_SHIFTRIGHT: return false;
7076 case EXPR_BINARY_ASSIGN: return true;
7077 case EXPR_BINARY_MUL_ASSIGN: return true;
7078 case EXPR_BINARY_DIV_ASSIGN: return true;
7079 case EXPR_BINARY_MOD_ASSIGN: return true;
7080 case EXPR_BINARY_ADD_ASSIGN: return true;
7081 case EXPR_BINARY_SUB_ASSIGN: return true;
7082 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
7083 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
7084 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
7085 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
7086 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
7088 /* Only examine the right hand side of && and ||, because the left hand
7089 * side already has the effect of controlling the execution of the right
7091 case EXPR_BINARY_LOGICAL_AND:
7092 case EXPR_BINARY_LOGICAL_OR:
7093 /* Only examine the right hand side of a comma expression, because the left
7094 * hand side has a separate warning */
7095 case EXPR_BINARY_COMMA:
7096 return expression_has_effect(expr->binary.right);
7098 case EXPR_BINARY_BUILTIN_EXPECT: return true;
7099 case EXPR_BINARY_ISGREATER: return false;
7100 case EXPR_BINARY_ISGREATEREQUAL: return false;
7101 case EXPR_BINARY_ISLESS: return false;
7102 case EXPR_BINARY_ISLESSEQUAL: return false;
7103 case EXPR_BINARY_ISLESSGREATER: return false;
7104 case EXPR_BINARY_ISUNORDERED: return false;
7107 internal_errorf(HERE, "unexpected expression");
7110 static void semantic_comma(binary_expression_t *expression)
7112 if (warning.unused_value) {
7113 const expression_t *const left = expression->left;
7114 if (!expression_has_effect(left)) {
7115 warningf(&left->base.source_position,
7116 "left-hand operand of comma expression has no effect");
7119 expression->base.type = expression->right->base.type;
7122 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
7123 static expression_t *parse_##binexpression_type(unsigned precedence, \
7124 expression_t *left) \
7127 source_position_t pos = *HERE; \
7129 expression_t *right = parse_sub_expression(precedence + lr); \
7131 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
7132 binexpr->base.source_position = pos; \
7133 binexpr->binary.left = left; \
7134 binexpr->binary.right = right; \
7135 sfunc(&binexpr->binary); \
7140 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
7141 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
7142 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
7143 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
7144 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
7145 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
7146 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
7147 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
7148 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
7150 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
7151 semantic_comparison, 1)
7152 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
7153 semantic_comparison, 1)
7154 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
7155 semantic_comparison, 1)
7156 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
7157 semantic_comparison, 1)
7159 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
7160 semantic_binexpr_arithmetic, 1)
7161 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
7162 semantic_binexpr_arithmetic, 1)
7163 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
7164 semantic_binexpr_arithmetic, 1)
7165 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
7166 semantic_logical_op, 1)
7167 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
7168 semantic_logical_op, 1)
7169 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
7170 semantic_shift_op, 1)
7171 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
7172 semantic_shift_op, 1)
7173 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
7174 semantic_arithmetic_addsubb_assign, 0)
7175 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
7176 semantic_arithmetic_addsubb_assign, 0)
7177 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
7178 semantic_arithmetic_assign, 0)
7179 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
7180 semantic_arithmetic_assign, 0)
7181 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
7182 semantic_arithmetic_assign, 0)
7183 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
7184 semantic_arithmetic_assign, 0)
7185 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7186 semantic_arithmetic_assign, 0)
7187 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
7188 semantic_arithmetic_assign, 0)
7189 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
7190 semantic_arithmetic_assign, 0)
7191 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
7192 semantic_arithmetic_assign, 0)
7194 static expression_t *parse_sub_expression(unsigned precedence)
7196 if (token.type < 0) {
7197 return expected_expression_error();
7200 expression_parser_function_t *parser
7201 = &expression_parsers[token.type];
7202 source_position_t source_position = token.source_position;
7205 if (parser->parser != NULL) {
7206 left = parser->parser(parser->precedence);
7208 left = parse_primary_expression();
7210 assert(left != NULL);
7211 left->base.source_position = source_position;
7214 if (token.type < 0) {
7215 return expected_expression_error();
7218 parser = &expression_parsers[token.type];
7219 if (parser->infix_parser == NULL)
7221 if (parser->infix_precedence < precedence)
7224 left = parser->infix_parser(parser->infix_precedence, left);
7226 assert(left != NULL);
7227 assert(left->kind != EXPR_UNKNOWN);
7228 left->base.source_position = source_position;
7235 * Parse an expression.
7237 static expression_t *parse_expression(void)
7239 return parse_sub_expression(1);
7243 * Register a parser for a prefix-like operator with given precedence.
7245 * @param parser the parser function
7246 * @param token_type the token type of the prefix token
7247 * @param precedence the precedence of the operator
7249 static void register_expression_parser(parse_expression_function parser,
7250 int token_type, unsigned precedence)
7252 expression_parser_function_t *entry = &expression_parsers[token_type];
7254 if (entry->parser != NULL) {
7255 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7256 panic("trying to register multiple expression parsers for a token");
7258 entry->parser = parser;
7259 entry->precedence = precedence;
7263 * Register a parser for an infix operator with given precedence.
7265 * @param parser the parser function
7266 * @param token_type the token type of the infix operator
7267 * @param precedence the precedence of the operator
7269 static void register_infix_parser(parse_expression_infix_function parser,
7270 int token_type, unsigned precedence)
7272 expression_parser_function_t *entry = &expression_parsers[token_type];
7274 if (entry->infix_parser != NULL) {
7275 diagnosticf("for token '%k'\n", (token_type_t)token_type);
7276 panic("trying to register multiple infix expression parsers for a "
7279 entry->infix_parser = parser;
7280 entry->infix_precedence = precedence;
7284 * Initialize the expression parsers.
7286 static void init_expression_parsers(void)
7288 memset(&expression_parsers, 0, sizeof(expression_parsers));
7290 register_infix_parser(parse_array_expression, '[', 30);
7291 register_infix_parser(parse_call_expression, '(', 30);
7292 register_infix_parser(parse_select_expression, '.', 30);
7293 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
7294 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
7296 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
7299 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
7300 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
7301 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
7302 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
7303 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
7304 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
7305 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
7306 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
7307 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
7308 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
7309 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
7310 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
7311 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
7312 T_EXCLAMATIONMARKEQUAL, 13);
7313 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
7314 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
7315 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
7316 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
7317 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
7318 register_infix_parser(parse_conditional_expression, '?', 7);
7319 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
7320 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
7321 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
7322 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
7323 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
7324 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
7325 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
7326 T_LESSLESSEQUAL, 2);
7327 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
7328 T_GREATERGREATEREQUAL, 2);
7329 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
7331 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
7333 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
7336 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
7338 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
7339 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
7340 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
7341 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
7342 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
7343 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
7344 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
7346 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
7348 register_expression_parser(parse_sizeof, T_sizeof, 25);
7349 register_expression_parser(parse_alignof, T___alignof__, 25);
7350 register_expression_parser(parse_extension, T___extension__, 25);
7351 register_expression_parser(parse_builtin_classify_type,
7352 T___builtin_classify_type, 25);
7356 * Parse a asm statement arguments specification.
7358 static asm_argument_t *parse_asm_arguments(bool is_out)
7360 asm_argument_t *result = NULL;
7361 asm_argument_t *last = NULL;
7363 while (token.type == T_STRING_LITERAL || token.type == '[') {
7364 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7365 memset(argument, 0, sizeof(argument[0]));
7367 if (token.type == '[') {
7369 if (token.type != T_IDENTIFIER) {
7370 parse_error_expected("while parsing asm argument",
7371 T_IDENTIFIER, NULL);
7374 argument->symbol = token.v.symbol;
7379 argument->constraints = parse_string_literals();
7381 expression_t *expression = parse_expression();
7382 argument->expression = expression;
7383 if (is_out && !is_lvalue(expression)) {
7384 errorf(&expression->base.source_position,
7385 "asm output argument is not an lvalue");
7389 set_address_taken(expression, true);
7392 last->next = argument;
7398 if (token.type != ',')
7409 * Parse a asm statement clobber specification.
7411 static asm_clobber_t *parse_asm_clobbers(void)
7413 asm_clobber_t *result = NULL;
7414 asm_clobber_t *last = NULL;
7416 while(token.type == T_STRING_LITERAL) {
7417 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
7418 clobber->clobber = parse_string_literals();
7421 last->next = clobber;
7427 if (token.type != ',')
7436 * Parse an asm statement.
7438 static statement_t *parse_asm_statement(void)
7442 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7443 statement->base.source_position = token.source_position;
7445 asm_statement_t *asm_statement = &statement->asms;
7447 if (token.type == T_volatile) {
7449 asm_statement->is_volatile = true;
7453 add_anchor_token(')');
7454 add_anchor_token(':');
7455 asm_statement->asm_text = parse_string_literals();
7457 if (token.type != ':') {
7458 rem_anchor_token(':');
7463 asm_statement->outputs = parse_asm_arguments(true);
7464 if (token.type != ':') {
7465 rem_anchor_token(':');
7470 asm_statement->inputs = parse_asm_arguments(false);
7471 if (token.type != ':') {
7472 rem_anchor_token(':');
7475 rem_anchor_token(':');
7478 asm_statement->clobbers = parse_asm_clobbers();
7481 rem_anchor_token(')');
7486 return create_invalid_statement();
7490 * Parse a case statement.
7492 static statement_t *parse_case_statement(void)
7496 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7498 statement->base.source_position = token.source_position;
7499 statement->case_label.expression = parse_expression();
7501 if (c_mode & _GNUC) {
7502 if (token.type == T_DOTDOTDOT) {
7504 statement->case_label.end_range = parse_expression();
7510 if (! is_constant_expression(statement->case_label.expression)) {
7511 errorf(&statement->base.source_position,
7512 "case label does not reduce to an integer constant");
7514 /* TODO: check if the case label is already known */
7515 if (current_switch != NULL) {
7516 /* link all cases into the switch statement */
7517 if (current_switch->last_case == NULL) {
7518 current_switch->first_case =
7519 current_switch->last_case = &statement->case_label;
7521 current_switch->last_case->next = &statement->case_label;
7524 errorf(&statement->base.source_position,
7525 "case label not within a switch statement");
7528 statement->case_label.statement = parse_statement();
7532 return create_invalid_statement();
7536 * Finds an existing default label of a switch statement.
7538 static case_label_statement_t *
7539 find_default_label(const switch_statement_t *statement)
7541 case_label_statement_t *label = statement->first_case;
7542 for ( ; label != NULL; label = label->next) {
7543 if (label->expression == NULL)
7550 * Parse a default statement.
7552 static statement_t *parse_default_statement(void)
7556 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7558 statement->base.source_position = token.source_position;
7561 if (current_switch != NULL) {
7562 const case_label_statement_t *def_label = find_default_label(current_switch);
7563 if (def_label != NULL) {
7564 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7565 &def_label->base.source_position);
7567 /* link all cases into the switch statement */
7568 if (current_switch->last_case == NULL) {
7569 current_switch->first_case =
7570 current_switch->last_case = &statement->case_label;
7572 current_switch->last_case->next = &statement->case_label;
7576 errorf(&statement->base.source_position,
7577 "'default' label not within a switch statement");
7579 statement->case_label.statement = parse_statement();
7583 return create_invalid_statement();
7587 * Return the declaration for a given label symbol or create a new one.
7589 static declaration_t *get_label(symbol_t *symbol)
7591 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7592 assert(current_function != NULL);
7593 /* if we found a label in the same function, then we already created the
7595 if (candidate != NULL
7596 && candidate->parent_scope == ¤t_function->scope) {
7600 /* otherwise we need to create a new one */
7601 declaration_t *const declaration = allocate_declaration_zero();
7602 declaration->namespc = NAMESPACE_LABEL;
7603 declaration->symbol = symbol;
7605 label_push(declaration);
7611 * Parse a label statement.
7613 static statement_t *parse_label_statement(void)
7615 assert(token.type == T_IDENTIFIER);
7616 symbol_t *symbol = token.v.symbol;
7619 declaration_t *label = get_label(symbol);
7621 /* if source position is already set then the label is defined twice,
7622 * otherwise it was just mentioned in a goto so far */
7623 if (label->source_position.input_name != NULL) {
7624 errorf(HERE, "duplicate label '%Y' (declared %P)",
7625 symbol, &label->source_position);
7627 label->source_position = token.source_position;
7630 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7632 statement->base.source_position = token.source_position;
7633 statement->label.label = label;
7637 if (token.type == '}') {
7638 /* TODO only warn? */
7640 warningf(HERE, "label at end of compound statement");
7641 statement->label.statement = create_empty_statement();
7643 errorf(HERE, "label at end of compound statement");
7644 statement->label.statement = create_invalid_statement();
7648 if (token.type == ';') {
7649 /* eat an empty statement here, to avoid the warning about an empty
7650 * after a label. label:; is commonly used to have a label before
7652 statement->label.statement = create_empty_statement();
7655 statement->label.statement = parse_statement();
7659 /* remember the labels's in a list for later checking */
7660 if (label_last == NULL) {
7661 label_first = &statement->label;
7663 label_last->next = &statement->label;
7665 label_last = &statement->label;
7671 * Parse an if statement.
7673 static statement_t *parse_if(void)
7677 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7678 statement->base.source_position = token.source_position;
7681 add_anchor_token(')');
7682 statement->ifs.condition = parse_expression();
7683 rem_anchor_token(')');
7686 add_anchor_token(T_else);
7687 statement->ifs.true_statement = parse_statement();
7688 rem_anchor_token(T_else);
7690 if (token.type == T_else) {
7692 statement->ifs.false_statement = parse_statement();
7697 return create_invalid_statement();
7701 * Parse a switch statement.
7703 static statement_t *parse_switch(void)
7707 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7708 statement->base.source_position = token.source_position;
7711 expression_t *const expr = parse_expression();
7712 type_t * type = skip_typeref(expr->base.type);
7713 if (is_type_integer(type)) {
7714 type = promote_integer(type);
7715 } else if (is_type_valid(type)) {
7716 errorf(&expr->base.source_position,
7717 "switch quantity is not an integer, but '%T'", type);
7718 type = type_error_type;
7720 statement->switchs.expression = create_implicit_cast(expr, type);
7723 switch_statement_t *rem = current_switch;
7724 current_switch = &statement->switchs;
7725 statement->switchs.body = parse_statement();
7726 current_switch = rem;
7728 if (warning.switch_default &&
7729 find_default_label(&statement->switchs) == NULL) {
7730 warningf(&statement->base.source_position, "switch has no default case");
7735 return create_invalid_statement();
7738 static statement_t *parse_loop_body(statement_t *const loop)
7740 statement_t *const rem = current_loop;
7741 current_loop = loop;
7743 statement_t *const body = parse_statement();
7750 * Parse a while statement.
7752 static statement_t *parse_while(void)
7756 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7757 statement->base.source_position = token.source_position;
7760 add_anchor_token(')');
7761 statement->whiles.condition = parse_expression();
7762 rem_anchor_token(')');
7765 statement->whiles.body = parse_loop_body(statement);
7769 return create_invalid_statement();
7773 * Parse a do statement.
7775 static statement_t *parse_do(void)
7779 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7781 statement->base.source_position = token.source_position;
7783 add_anchor_token(T_while);
7784 statement->do_while.body = parse_loop_body(statement);
7785 rem_anchor_token(T_while);
7789 add_anchor_token(')');
7790 statement->do_while.condition = parse_expression();
7791 rem_anchor_token(')');
7797 return create_invalid_statement();
7801 * Parse a for statement.
7803 static statement_t *parse_for(void)
7807 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7808 statement->base.source_position = token.source_position;
7810 int top = environment_top();
7811 scope_t *last_scope = scope;
7812 set_scope(&statement->fors.scope);
7815 add_anchor_token(')');
7817 if (token.type != ';') {
7818 if (is_declaration_specifier(&token, false)) {
7819 parse_declaration(record_declaration);
7821 add_anchor_token(';');
7822 expression_t *const init = parse_expression();
7823 statement->fors.initialisation = init;
7824 if (warning.unused_value && !expression_has_effect(init)) {
7825 warningf(&init->base.source_position,
7826 "initialisation of 'for'-statement has no effect");
7828 rem_anchor_token(';');
7835 if (token.type != ';') {
7836 add_anchor_token(';');
7837 statement->fors.condition = parse_expression();
7838 rem_anchor_token(';');
7841 if (token.type != ')') {
7842 expression_t *const step = parse_expression();
7843 statement->fors.step = step;
7844 if (warning.unused_value && !expression_has_effect(step)) {
7845 warningf(&step->base.source_position,
7846 "step of 'for'-statement has no effect");
7849 rem_anchor_token(')');
7851 statement->fors.body = parse_loop_body(statement);
7853 assert(scope == &statement->fors.scope);
7854 set_scope(last_scope);
7855 environment_pop_to(top);
7860 rem_anchor_token(')');
7861 assert(scope == &statement->fors.scope);
7862 set_scope(last_scope);
7863 environment_pop_to(top);
7865 return create_invalid_statement();
7869 * Parse a goto statement.
7871 static statement_t *parse_goto(void)
7875 if (token.type != T_IDENTIFIER) {
7876 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
7880 symbol_t *symbol = token.v.symbol;
7883 declaration_t *label = get_label(symbol);
7885 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
7886 statement->base.source_position = token.source_position;
7888 statement->gotos.label = label;
7890 /* remember the goto's in a list for later checking */
7891 if (goto_last == NULL) {
7892 goto_first = &statement->gotos;
7894 goto_last->next = &statement->gotos;
7896 goto_last = &statement->gotos;
7902 return create_invalid_statement();
7906 * Parse a continue statement.
7908 static statement_t *parse_continue(void)
7910 statement_t *statement;
7911 if (current_loop == NULL) {
7912 errorf(HERE, "continue statement not within loop");
7913 statement = create_invalid_statement();
7915 statement = allocate_statement_zero(STATEMENT_CONTINUE);
7917 statement->base.source_position = token.source_position;
7925 return create_invalid_statement();
7929 * Parse a break statement.
7931 static statement_t *parse_break(void)
7933 statement_t *statement;
7934 if (current_switch == NULL && current_loop == NULL) {
7935 errorf(HERE, "break statement not within loop or switch");
7936 statement = create_invalid_statement();
7938 statement = allocate_statement_zero(STATEMENT_BREAK);
7940 statement->base.source_position = token.source_position;
7948 return create_invalid_statement();
7952 * Parse a __leave statement.
7954 static statement_t *parse_leave(void)
7956 statement_t *statement;
7957 if (current_try == NULL) {
7958 errorf(HERE, "__leave statement not within __try");
7959 statement = create_invalid_statement();
7961 statement = allocate_statement_zero(STATEMENT_LEAVE);
7963 statement->base.source_position = token.source_position;
7971 return create_invalid_statement();
7975 * Check if a given declaration represents a local variable.
7977 static bool is_local_var_declaration(const declaration_t *declaration) {
7978 switch ((storage_class_tag_t) declaration->storage_class) {
7979 case STORAGE_CLASS_AUTO:
7980 case STORAGE_CLASS_REGISTER: {
7981 const type_t *type = skip_typeref(declaration->type);
7982 if (is_type_function(type)) {
7994 * Check if a given declaration represents a variable.
7996 static bool is_var_declaration(const declaration_t *declaration) {
7997 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
8000 const type_t *type = skip_typeref(declaration->type);
8001 return !is_type_function(type);
8005 * Check if a given expression represents a local variable.
8007 static bool is_local_variable(const expression_t *expression)
8009 if (expression->base.kind != EXPR_REFERENCE) {
8012 const declaration_t *declaration = expression->reference.declaration;
8013 return is_local_var_declaration(declaration);
8017 * Check if a given expression represents a local variable and
8018 * return its declaration then, else return NULL.
8020 declaration_t *expr_is_variable(const expression_t *expression)
8022 if (expression->base.kind != EXPR_REFERENCE) {
8025 declaration_t *declaration = expression->reference.declaration;
8026 if (is_var_declaration(declaration))
8032 * Parse a return statement.
8034 static statement_t *parse_return(void)
8036 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
8037 statement->base.source_position = token.source_position;
8041 expression_t *return_value = NULL;
8042 if (token.type != ';') {
8043 return_value = parse_expression();
8047 const type_t *const func_type = current_function->type;
8048 assert(is_type_function(func_type));
8049 type_t *const return_type = skip_typeref(func_type->function.return_type);
8051 if (return_value != NULL) {
8052 type_t *return_value_type = skip_typeref(return_value->base.type);
8054 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
8055 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
8056 warningf(&statement->base.source_position,
8057 "'return' with a value, in function returning void");
8058 return_value = NULL;
8060 assign_error_t error = semantic_assign(return_type, return_value);
8061 report_assign_error(error, return_type, return_value, "'return'",
8062 &statement->base.source_position);
8063 return_value = create_implicit_cast(return_value, return_type);
8065 /* check for returning address of a local var */
8066 if (return_value != NULL &&
8067 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
8068 const expression_t *expression = return_value->unary.value;
8069 if (is_local_variable(expression)) {
8070 warningf(&statement->base.source_position,
8071 "function returns address of local variable");
8075 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
8076 warningf(&statement->base.source_position,
8077 "'return' without value, in function returning non-void");
8080 statement->returns.value = return_value;
8084 return create_invalid_statement();
8088 * Parse a declaration statement.
8090 static statement_t *parse_declaration_statement(void)
8092 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
8094 statement->base.source_position = token.source_position;
8096 declaration_t *before = last_declaration;
8097 parse_declaration(record_declaration);
8099 if (before == NULL) {
8100 statement->declaration.declarations_begin = scope->declarations;
8102 statement->declaration.declarations_begin = before->next;
8104 statement->declaration.declarations_end = last_declaration;
8110 * Parse an expression statement, ie. expr ';'.
8112 static statement_t *parse_expression_statement(void)
8114 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
8116 statement->base.source_position = token.source_position;
8117 expression_t *const expr = parse_expression();
8118 statement->expression.expression = expr;
8124 return create_invalid_statement();
8128 * Parse a microsoft __try { } __finally { } or
8129 * __try{ } __except() { }
8131 static statement_t *parse_ms_try_statment(void) {
8132 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
8134 statement->base.source_position = token.source_position;
8137 ms_try_statement_t *rem = current_try;
8138 current_try = &statement->ms_try;
8139 statement->ms_try.try_statement = parse_compound_statement(false);
8142 if (token.type == T___except) {
8145 add_anchor_token(')');
8146 expression_t *const expr = parse_expression();
8147 type_t * type = skip_typeref(expr->base.type);
8148 if (is_type_integer(type)) {
8149 type = promote_integer(type);
8150 } else if (is_type_valid(type)) {
8151 errorf(&expr->base.source_position,
8152 "__expect expression is not an integer, but '%T'", type);
8153 type = type_error_type;
8155 statement->ms_try.except_expression = create_implicit_cast(expr, type);
8156 rem_anchor_token(')');
8158 statement->ms_try.final_statement = parse_compound_statement(false);
8159 } else if (token.type == T__finally) {
8161 statement->ms_try.final_statement = parse_compound_statement(false);
8163 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
8164 return create_invalid_statement();
8168 return create_invalid_statement();
8172 * Parse a statement.
8173 * There's also parse_statement() which additionally checks for
8174 * "statement has no effect" warnings
8176 static statement_t *intern_parse_statement(void)
8178 statement_t *statement = NULL;
8180 /* declaration or statement */
8181 add_anchor_token(';');
8182 switch(token.type) {
8184 statement = parse_asm_statement();
8188 statement = parse_case_statement();
8192 statement = parse_default_statement();
8196 statement = parse_compound_statement(false);
8200 statement = parse_if ();
8204 statement = parse_switch();
8208 statement = parse_while();
8212 statement = parse_do();
8216 statement = parse_for();
8220 statement = parse_goto();
8224 statement = parse_continue();
8228 statement = parse_break();
8232 statement = parse_leave();
8236 statement = parse_return();
8240 if (warning.empty_statement) {
8241 warningf(HERE, "statement is empty");
8243 statement = create_empty_statement();
8248 if (look_ahead(1)->type == ':') {
8249 statement = parse_label_statement();
8253 if (is_typedef_symbol(token.v.symbol)) {
8254 statement = parse_declaration_statement();
8258 statement = parse_expression_statement();
8261 case T___extension__:
8262 /* this can be a prefix to a declaration or an expression statement */
8263 /* we simply eat it now and parse the rest with tail recursion */
8266 } while(token.type == T___extension__);
8267 statement = parse_statement();
8271 statement = parse_declaration_statement();
8275 statement = parse_ms_try_statment();
8279 statement = parse_expression_statement();
8282 rem_anchor_token(';');
8284 assert(statement != NULL
8285 && statement->base.source_position.input_name != NULL);
8291 * parse a statement and emits "statement has no effect" warning if needed
8292 * (This is really a wrapper around intern_parse_statement with check for 1
8293 * single warning. It is needed, because for statement expressions we have
8294 * to avoid the warning on the last statement)
8296 static statement_t *parse_statement(void)
8298 statement_t *statement = intern_parse_statement();
8300 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
8301 expression_t *expression = statement->expression.expression;
8302 if (!expression_has_effect(expression)) {
8303 warningf(&expression->base.source_position,
8304 "statement has no effect");
8312 * Parse a compound statement.
8314 static statement_t *parse_compound_statement(bool inside_expression_statement)
8316 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
8318 statement->base.source_position = token.source_position;
8321 add_anchor_token('}');
8323 int top = environment_top();
8324 scope_t *last_scope = scope;
8325 set_scope(&statement->compound.scope);
8327 statement_t *last_statement = NULL;
8329 while(token.type != '}' && token.type != T_EOF) {
8330 statement_t *sub_statement = intern_parse_statement();
8331 if (is_invalid_statement(sub_statement)) {
8332 /* an error occurred. if we are at an anchor, return */
8338 if (last_statement != NULL) {
8339 last_statement->base.next = sub_statement;
8341 statement->compound.statements = sub_statement;
8344 while(sub_statement->base.next != NULL)
8345 sub_statement = sub_statement->base.next;
8347 last_statement = sub_statement;
8350 if (token.type == '}') {
8353 errorf(&statement->base.source_position,
8354 "end of file while looking for closing '}'");
8357 /* look over all statements again to produce no effect warnings */
8358 if (warning.unused_value) {
8359 statement_t *sub_statement = statement->compound.statements;
8360 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
8361 if (sub_statement->kind != STATEMENT_EXPRESSION)
8363 /* don't emit a warning for the last expression in an expression
8364 * statement as it has always an effect */
8365 if (inside_expression_statement && sub_statement->base.next == NULL)
8368 expression_t *expression = sub_statement->expression.expression;
8369 if (!expression_has_effect(expression)) {
8370 warningf(&expression->base.source_position,
8371 "statement has no effect");
8377 rem_anchor_token('}');
8378 assert(scope == &statement->compound.scope);
8379 set_scope(last_scope);
8380 environment_pop_to(top);
8386 * Initialize builtin types.
8388 static void initialize_builtin_types(void)
8390 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
8391 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
8392 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
8393 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
8394 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
8395 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
8396 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
8397 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
8399 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
8400 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
8401 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
8402 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
8406 * Check for unused global static functions and variables
8408 static void check_unused_globals(void)
8410 if (!warning.unused_function && !warning.unused_variable)
8413 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
8414 if (decl->used || decl->storage_class != STORAGE_CLASS_STATIC)
8417 type_t *const type = decl->type;
8419 if (is_type_function(skip_typeref(type))) {
8420 if (!warning.unused_function || decl->is_inline)
8423 s = (decl->init.statement != NULL ? "defined" : "declared");
8425 if (!warning.unused_variable)
8431 warningf(&decl->source_position, "'%#T' %s but not used",
8432 type, decl->symbol, s);
8437 * Parse a translation unit.
8439 static void parse_translation_unit(void)
8441 while(token.type != T_EOF) {
8442 if (token.type == ';') {
8443 /* TODO error in strict mode */
8444 warningf(HERE, "stray ';' outside of function");
8447 parse_external_declaration();
8455 * @return the translation unit or NULL if errors occurred.
8457 void start_parsing(void)
8459 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8460 label_stack = NEW_ARR_F(stack_entry_t, 0);
8461 diagnostic_count = 0;
8465 type_set_output(stderr);
8466 ast_set_output(stderr);
8468 assert(unit == NULL);
8469 unit = allocate_ast_zero(sizeof(unit[0]));
8471 assert(global_scope == NULL);
8472 global_scope = &unit->scope;
8474 assert(scope == NULL);
8475 set_scope(&unit->scope);
8477 initialize_builtin_types();
8480 translation_unit_t *finish_parsing(void)
8482 assert(scope == &unit->scope);
8484 last_declaration = NULL;
8486 assert(global_scope == &unit->scope);
8487 check_unused_globals();
8488 global_scope = NULL;
8490 DEL_ARR_F(environment_stack);
8491 DEL_ARR_F(label_stack);
8493 translation_unit_t *result = unit;
8500 lookahead_bufpos = 0;
8501 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8504 parse_translation_unit();
8508 * Initialize the parser.
8510 void init_parser(void)
8513 /* add predefined symbols for extended-decl-modifier */
8514 sym_align = symbol_table_insert("align");
8515 sym_allocate = symbol_table_insert("allocate");
8516 sym_dllimport = symbol_table_insert("dllimport");
8517 sym_dllexport = symbol_table_insert("dllexport");
8518 sym_naked = symbol_table_insert("naked");
8519 sym_noinline = symbol_table_insert("noinline");
8520 sym_noreturn = symbol_table_insert("noreturn");
8521 sym_nothrow = symbol_table_insert("nothrow");
8522 sym_novtable = symbol_table_insert("novtable");
8523 sym_property = symbol_table_insert("property");
8524 sym_get = symbol_table_insert("get");
8525 sym_put = symbol_table_insert("put");
8526 sym_selectany = symbol_table_insert("selectany");
8527 sym_thread = symbol_table_insert("thread");
8528 sym_uuid = symbol_table_insert("uuid");
8529 sym_deprecated = symbol_table_insert("deprecated");
8530 sym_restrict = symbol_table_insert("restrict");
8531 sym_noalias = symbol_table_insert("noalias");
8533 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8535 init_expression_parsers();
8536 obstack_init(&temp_obst);
8538 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8539 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8543 * Terminate the parser.
8545 void exit_parser(void)
8547 obstack_free(&temp_obst, NULL);