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 /** if wchar_t is equal to unsigned short. */
43 bool opt_short_wchar_t =
50 //#define PRINT_TOKENS
51 #define MAX_LOOKAHEAD 2
54 declaration_t *old_declaration;
56 unsigned short namespc;
59 typedef struct argument_list_t argument_list_t;
60 struct argument_list_t {
62 argument_list_t *next;
65 typedef struct gnu_attribute_t gnu_attribute_t;
66 struct gnu_attribute_t {
67 gnu_attribute_kind_t kind; /**< The kind of the GNU attribute. */
68 gnu_attribute_t *next;
69 bool invalid; /**< Set if this attribute had argument errors, */
70 bool have_arguments; /**< True, if this attribute has arguments. */
74 atomic_type_kind_t akind;
75 long argument; /**< Single argument. */
76 argument_list_t *arguments; /**< List of argument expressions. */
80 typedef struct declaration_specifiers_t declaration_specifiers_t;
81 struct declaration_specifiers_t {
82 source_position_t source_position;
83 unsigned char declared_storage_class;
84 unsigned char alignment; /**< Alignment, 0 if not set. */
85 unsigned int is_inline : 1;
86 unsigned int deprecated : 1;
87 decl_modifiers_t modifiers; /**< declaration modifiers */
88 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
89 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
90 symbol_t *get_property_sym; /**< the name of the get property if set. */
91 symbol_t *put_property_sym; /**< the name of the put property if set. */
96 * An environment for parsing initializers (and compound literals).
98 typedef struct parse_initializer_env_t {
99 type_t *type; /**< the type of the initializer. In case of an
100 array type with unspecified size this gets
101 adjusted to the actual size. */
102 declaration_t *declaration; /**< the declaration that is initialized if any */
103 bool must_be_constant;
104 } parse_initializer_env_t;
106 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration, bool is_definition);
108 /** The current token. */
109 static token_t token;
110 /** The lookahead ring-buffer. */
111 static token_t lookahead_buffer[MAX_LOOKAHEAD];
112 /** Position of the next token in the lookahead buffer. */
113 static int lookahead_bufpos;
114 static stack_entry_t *environment_stack = NULL;
115 static stack_entry_t *label_stack = NULL;
116 static stack_entry_t *local_label_stack = NULL;
117 /** The global file scope. */
118 static scope_t *file_scope = NULL;
119 /** The current scope. */
120 static scope_t *scope = NULL;
121 static declaration_t *last_declaration = NULL;
122 /** Point to the current function declaration if inside a function. */
123 static declaration_t *current_function = NULL;
124 static declaration_t *current_init_decl = NULL;
125 static switch_statement_t *current_switch = NULL;
126 static statement_t *current_loop = NULL;
127 static statement_t *current_parent = NULL;
128 static ms_try_statement_t *current_try = NULL;
129 static goto_statement_t *goto_first = NULL;
130 static goto_statement_t *goto_last = NULL;
131 static label_statement_t *label_first = NULL;
132 static label_statement_t *label_last = NULL;
133 /** current translation unit. */
134 static translation_unit_t *unit = NULL;
135 /** true if we are in a type property context (evaluation only for type. */
136 static bool in_type_prop = false;
137 /** true in we are in a __extension__ context. */
138 static bool in_gcc_extension = false;
139 static struct obstack temp_obst;
142 #define PUSH_PARENT(stmt) \
143 statement_t *const prev_parent = current_parent; \
144 current_parent = (stmt);
145 #define POP_PARENT ((void)(current_parent = prev_parent))
147 static source_position_t null_position = { NULL, 0 };
149 /** special symbol used for anonymous entities. */
150 static const symbol_t *sym_anonymous = NULL;
152 /* symbols for Microsoft extended-decl-modifier */
153 static const symbol_t *sym_align = NULL;
154 static const symbol_t *sym_allocate = NULL;
155 static const symbol_t *sym_dllimport = NULL;
156 static const symbol_t *sym_dllexport = NULL;
157 static const symbol_t *sym_naked = NULL;
158 static const symbol_t *sym_noinline = NULL;
159 static const symbol_t *sym_noreturn = NULL;
160 static const symbol_t *sym_nothrow = NULL;
161 static const symbol_t *sym_novtable = NULL;
162 static const symbol_t *sym_property = NULL;
163 static const symbol_t *sym_get = NULL;
164 static const symbol_t *sym_put = NULL;
165 static const symbol_t *sym_selectany = NULL;
166 static const symbol_t *sym_thread = NULL;
167 static const symbol_t *sym_uuid = NULL;
168 static const symbol_t *sym_deprecated = NULL;
169 static const symbol_t *sym_restrict = NULL;
170 static const symbol_t *sym_noalias = NULL;
172 /** The token anchor set */
173 static unsigned char token_anchor_set[T_LAST_TOKEN];
175 /** The current source position. */
176 #define HERE (&token.source_position)
178 /** true if we are in GCC mode. */
179 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
181 static type_t *type_valist;
183 static statement_t *parse_compound_statement(bool inside_expression_statement);
184 static statement_t *parse_statement(void);
186 static expression_t *parse_sub_expression(unsigned precedence);
187 static expression_t *parse_expression(void);
188 static type_t *parse_typename(void);
190 static void parse_compound_type_entries(declaration_t *compound_declaration);
191 static declaration_t *parse_declarator(
192 const declaration_specifiers_t *specifiers, bool may_be_abstract);
193 static declaration_t *record_declaration(declaration_t *declaration, bool is_definition);
195 static void semantic_comparison(binary_expression_t *expression);
197 #define STORAGE_CLASSES \
205 #define TYPE_QUALIFIERS \
210 case T__forceinline: \
211 case T___attribute__:
213 #ifdef PROVIDE_COMPLEX
214 #define COMPLEX_SPECIFIERS \
216 #define IMAGINARY_SPECIFIERS \
219 #define COMPLEX_SPECIFIERS
220 #define IMAGINARY_SPECIFIERS
223 #define TYPE_SPECIFIERS \
238 case T___builtin_va_list: \
243 #define DECLARATION_START \
248 #define TYPENAME_START \
253 * Allocate an AST node with given size and
254 * initialize all fields with zero.
256 static void *allocate_ast_zero(size_t size)
258 void *res = allocate_ast(size);
259 memset(res, 0, size);
263 static declaration_t *allocate_declaration_zero(void)
265 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
266 declaration->type = type_error_type;
267 declaration->alignment = 0;
272 * Returns the size of a statement node.
274 * @param kind the statement kind
276 static size_t get_statement_struct_size(statement_kind_t kind)
278 static const size_t sizes[] = {
279 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
280 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
281 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
282 [STATEMENT_RETURN] = sizeof(return_statement_t),
283 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
284 [STATEMENT_IF] = sizeof(if_statement_t),
285 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
286 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
287 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
288 [STATEMENT_BREAK] = sizeof(statement_base_t),
289 [STATEMENT_GOTO] = sizeof(goto_statement_t),
290 [STATEMENT_LABEL] = sizeof(label_statement_t),
291 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
292 [STATEMENT_WHILE] = sizeof(while_statement_t),
293 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
294 [STATEMENT_FOR] = sizeof(for_statement_t),
295 [STATEMENT_ASM] = sizeof(asm_statement_t),
296 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
297 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
299 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
300 assert(sizes[kind] != 0);
305 * Returns the size of an expression node.
307 * @param kind the expression kind
309 static size_t get_expression_struct_size(expression_kind_t kind)
311 static const size_t sizes[] = {
312 [EXPR_INVALID] = sizeof(expression_base_t),
313 [EXPR_REFERENCE] = sizeof(reference_expression_t),
314 [EXPR_CONST] = sizeof(const_expression_t),
315 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
316 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
317 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
318 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
319 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
320 [EXPR_CALL] = sizeof(call_expression_t),
321 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
322 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
323 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
324 [EXPR_SELECT] = sizeof(select_expression_t),
325 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
326 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
327 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
328 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
329 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
330 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
331 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
332 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
333 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
334 [EXPR_VA_START] = sizeof(va_start_expression_t),
335 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
336 [EXPR_STATEMENT] = sizeof(statement_expression_t),
337 [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t),
339 if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
340 return sizes[EXPR_UNARY_FIRST];
342 if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
343 return sizes[EXPR_BINARY_FIRST];
345 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
346 assert(sizes[kind] != 0);
351 * Allocate a statement node of given kind and initialize all
354 static statement_t *allocate_statement_zero(statement_kind_t kind)
356 size_t size = get_statement_struct_size(kind);
357 statement_t *res = allocate_ast_zero(size);
359 res->base.kind = kind;
360 res->base.parent = current_parent;
361 res->base.source_position = token.source_position;
366 * Allocate an expression node of given kind and initialize all
369 static expression_t *allocate_expression_zero(expression_kind_t kind)
371 size_t size = get_expression_struct_size(kind);
372 expression_t *res = allocate_ast_zero(size);
374 res->base.kind = kind;
375 res->base.type = type_error_type;
380 * Creates a new invalid expression.
382 static expression_t *create_invalid_expression(void)
384 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
385 expression->base.source_position = token.source_position;
390 * Creates a new invalid statement.
392 static statement_t *create_invalid_statement(void)
394 return allocate_statement_zero(STATEMENT_INVALID);
398 * Allocate a new empty statement.
400 static statement_t *create_empty_statement(void)
402 return allocate_statement_zero(STATEMENT_EMPTY);
406 * Returns the size of a type node.
408 * @param kind the type kind
410 static size_t get_type_struct_size(type_kind_t kind)
412 static const size_t sizes[] = {
413 [TYPE_ATOMIC] = sizeof(atomic_type_t),
414 [TYPE_COMPLEX] = sizeof(complex_type_t),
415 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
416 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
417 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
418 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
419 [TYPE_ENUM] = sizeof(enum_type_t),
420 [TYPE_FUNCTION] = sizeof(function_type_t),
421 [TYPE_POINTER] = sizeof(pointer_type_t),
422 [TYPE_ARRAY] = sizeof(array_type_t),
423 [TYPE_BUILTIN] = sizeof(builtin_type_t),
424 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
425 [TYPE_TYPEOF] = sizeof(typeof_type_t),
427 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
428 assert(kind <= TYPE_TYPEOF);
429 assert(sizes[kind] != 0);
434 * Allocate a type node of given kind and initialize all
437 * @param kind type kind to allocate
438 * @param source_position the source position of the type definition
440 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
442 size_t size = get_type_struct_size(kind);
443 type_t *res = obstack_alloc(type_obst, size);
444 memset(res, 0, size);
446 res->base.kind = kind;
447 res->base.source_position = *source_position;
452 * Returns the size of an initializer node.
454 * @param kind the initializer kind
456 static size_t get_initializer_size(initializer_kind_t kind)
458 static const size_t sizes[] = {
459 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
460 [INITIALIZER_STRING] = sizeof(initializer_string_t),
461 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
462 [INITIALIZER_LIST] = sizeof(initializer_list_t),
463 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
465 assert(kind < sizeof(sizes) / sizeof(*sizes));
466 assert(sizes[kind] != 0);
471 * Allocate an initializer node of given kind and initialize all
474 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
476 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
483 * Free a type from the type obstack.
485 static void free_type(void *type)
487 obstack_free(type_obst, type);
491 * Returns the index of the top element of the environment stack.
493 static size_t environment_top(void)
495 return ARR_LEN(environment_stack);
499 * Returns the index of the top element of the global label stack.
501 static size_t label_top(void)
503 return ARR_LEN(label_stack);
507 * Returns the index of the top element of the local label stack.
509 static size_t local_label_top(void)
511 return ARR_LEN(local_label_stack);
515 * Return the next token.
517 static inline void next_token(void)
519 token = lookahead_buffer[lookahead_bufpos];
520 lookahead_buffer[lookahead_bufpos] = lexer_token;
523 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
526 print_token(stderr, &token);
527 fprintf(stderr, "\n");
532 * Return the next token with a given lookahead.
534 static inline const token_t *look_ahead(int num)
536 assert(num > 0 && num <= MAX_LOOKAHEAD);
537 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
538 return &lookahead_buffer[pos];
542 * Adds a token to the token anchor set (a multi-set).
544 static void add_anchor_token(int token_type)
546 assert(0 <= token_type && token_type < T_LAST_TOKEN);
547 ++token_anchor_set[token_type];
550 static int save_and_reset_anchor_state(int token_type)
552 assert(0 <= token_type && token_type < T_LAST_TOKEN);
553 int count = token_anchor_set[token_type];
554 token_anchor_set[token_type] = 0;
558 static void restore_anchor_state(int token_type, int count)
560 assert(0 <= token_type && token_type < T_LAST_TOKEN);
561 token_anchor_set[token_type] = count;
565 * Remove a token from the token anchor set (a multi-set).
567 static void rem_anchor_token(int token_type)
569 assert(0 <= token_type && token_type < T_LAST_TOKEN);
570 assert(token_anchor_set[token_type] != 0);
571 --token_anchor_set[token_type];
574 static bool at_anchor(void)
578 return token_anchor_set[token.type];
582 * Eat tokens until a matching token is found.
584 static void eat_until_matching_token(int type)
588 case '(': end_token = ')'; break;
589 case '{': end_token = '}'; break;
590 case '[': end_token = ']'; break;
591 default: end_token = type; break;
594 unsigned parenthesis_count = 0;
595 unsigned brace_count = 0;
596 unsigned bracket_count = 0;
597 while (token.type != end_token ||
598 parenthesis_count != 0 ||
600 bracket_count != 0) {
601 switch (token.type) {
603 case '(': ++parenthesis_count; break;
604 case '{': ++brace_count; break;
605 case '[': ++bracket_count; break;
608 if (parenthesis_count > 0)
618 if (bracket_count > 0)
621 if (token.type == end_token &&
622 parenthesis_count == 0 &&
636 * Eat input tokens until an anchor is found.
638 static void eat_until_anchor(void)
640 while (token_anchor_set[token.type] == 0) {
641 if (token.type == '(' || token.type == '{' || token.type == '[')
642 eat_until_matching_token(token.type);
647 static void eat_block(void)
649 eat_until_matching_token('{');
650 if (token.type == '}')
654 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while (0)
657 * Report a parse error because an expected token was not found.
660 #if defined __GNUC__ && __GNUC__ >= 4
661 __attribute__((sentinel))
663 void parse_error_expected(const char *message, ...)
665 if (message != NULL) {
666 errorf(HERE, "%s", message);
669 va_start(ap, message);
670 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
675 * Report a type error.
677 static void type_error(const char *msg, const source_position_t *source_position,
680 errorf(source_position, "%s, but found type '%T'", msg, type);
684 * Report an incompatible type.
686 static void type_error_incompatible(const char *msg,
687 const source_position_t *source_position, type_t *type1, type_t *type2)
689 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
694 * Expect the the current token is the expected token.
695 * If not, generate an error, eat the current statement,
696 * and goto the end_error label.
698 #define expect(expected) \
700 if (UNLIKELY(token.type != (expected))) { \
701 parse_error_expected(NULL, (expected), NULL); \
702 add_anchor_token(expected); \
703 eat_until_anchor(); \
704 if (token.type == expected) \
706 rem_anchor_token(expected); \
712 static void scope_push(scope_t *new_scope)
715 scope->last_declaration = last_declaration;
716 new_scope->depth = scope->depth + 1;
718 new_scope->parent = scope;
721 last_declaration = new_scope->last_declaration;
724 static void scope_pop(void)
726 scope->last_declaration = last_declaration;
727 scope = scope->parent;
728 last_declaration = scope->last_declaration;
732 * Search a symbol in a given namespace and returns its declaration or
733 * NULL if this symbol was not found.
735 static declaration_t *get_declaration(const symbol_t *const symbol,
736 const namespace_t namespc)
738 declaration_t *declaration = symbol->declaration;
739 for( ; declaration != NULL; declaration = declaration->symbol_next) {
740 if (declaration->namespc == namespc)
748 * pushs an environment_entry on the environment stack and links the
749 * corresponding symbol to the new entry
751 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
753 symbol_t *symbol = declaration->symbol;
754 namespace_t namespc = (namespace_t) declaration->namespc;
756 /* replace/add declaration into declaration list of the symbol */
757 declaration_t **anchor;
759 for (anchor = &symbol->declaration;; anchor = &iter->symbol_next) {
764 /* replace an entry? */
765 if (iter->namespc == namespc) {
766 declaration->symbol_next = iter->symbol_next;
770 *anchor = declaration;
772 /* remember old declaration */
774 entry.symbol = symbol;
775 entry.old_declaration = iter;
776 entry.namespc = (unsigned short) namespc;
777 ARR_APP1(stack_entry_t, *stack_ptr, entry);
781 * Push a declaration on the environment stack.
783 * @param declaration the declaration
785 static void environment_push(declaration_t *declaration)
787 assert(declaration->source_position.input_name != NULL);
788 assert(declaration->parent_scope != NULL);
789 stack_push(&environment_stack, declaration);
793 * Push a declaration on the global label stack.
795 * @param declaration the declaration
797 static void label_push(declaration_t *declaration)
799 declaration->parent_scope = ¤t_function->scope;
800 stack_push(&label_stack, declaration);
804 * Push a declaration of the local label stack.
806 * @param declaration the declaration
808 static void local_label_push(declaration_t *declaration)
810 assert(declaration->parent_scope != NULL);
811 stack_push(&local_label_stack, declaration);
815 * pops symbols from the environment stack until @p new_top is the top element
817 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
819 stack_entry_t *stack = *stack_ptr;
820 size_t top = ARR_LEN(stack);
823 assert(new_top <= top);
827 for(i = top; i > new_top; --i) {
828 stack_entry_t *entry = &stack[i - 1];
830 declaration_t *old_declaration = entry->old_declaration;
831 symbol_t *symbol = entry->symbol;
832 namespace_t namespc = (namespace_t)entry->namespc;
834 /* replace/remove declaration */
835 declaration_t **anchor;
837 for (anchor = &symbol->declaration;; anchor = &iter->symbol_next) {
839 assert(iter != NULL);
840 /* replace an entry? */
841 if (iter->namespc == namespc)
845 /* Because of scopes and appending other namespaces to the end of
846 * the list, this must hold. */
847 assert((old_declaration != NULL ? old_declaration->symbol_next : NULL) == iter->symbol_next);
848 *anchor = old_declaration;
851 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
855 * Pop all entries from the environment stack until the new_top
858 * @param new_top the new stack top
860 static void environment_pop_to(size_t new_top)
862 stack_pop_to(&environment_stack, new_top);
866 * Pop all entries from the global label stack until the new_top
869 * @param new_top the new stack top
871 static void label_pop_to(size_t new_top)
873 stack_pop_to(&label_stack, new_top);
877 * Pop all entries from the local label stack until the new_top
880 * @param new_top the new stack top
882 static void local_label_pop_to(size_t new_top)
884 stack_pop_to(&local_label_stack, new_top);
888 static int get_akind_rank(atomic_type_kind_t akind)
893 static int get_rank(const type_t *type)
895 assert(!is_typeref(type));
896 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
897 * and esp. footnote 108). However we can't fold constants (yet), so we
898 * can't decide whether unsigned int is possible, while int always works.
899 * (unsigned int would be preferable when possible... for stuff like
900 * struct { enum { ... } bla : 4; } ) */
901 if (type->kind == TYPE_ENUM)
902 return get_akind_rank(ATOMIC_TYPE_INT);
904 assert(type->kind == TYPE_ATOMIC);
905 return get_akind_rank(type->atomic.akind);
908 static type_t *promote_integer(type_t *type)
910 if (type->kind == TYPE_BITFIELD)
911 type = type->bitfield.base_type;
913 if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
920 * Create a cast expression.
922 * @param expression the expression to cast
923 * @param dest_type the destination type
925 static expression_t *create_cast_expression(expression_t *expression,
928 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
930 cast->unary.value = expression;
931 cast->base.type = dest_type;
937 * Check if a given expression represents the 0 pointer constant.
939 static bool is_null_pointer_constant(const expression_t *expression)
941 /* skip void* cast */
942 if (expression->kind == EXPR_UNARY_CAST
943 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
944 expression = expression->unary.value;
947 /* TODO: not correct yet, should be any constant integer expression
948 * which evaluates to 0 */
949 if (expression->kind != EXPR_CONST)
952 type_t *const type = skip_typeref(expression->base.type);
953 if (!is_type_integer(type))
956 return expression->conste.v.int_value == 0;
960 * Create an implicit cast expression.
962 * @param expression the expression to cast
963 * @param dest_type the destination type
965 static expression_t *create_implicit_cast(expression_t *expression,
968 type_t *const source_type = expression->base.type;
970 if (source_type == dest_type)
973 return create_cast_expression(expression, dest_type);
976 typedef enum assign_error_t {
978 ASSIGN_ERROR_INCOMPATIBLE,
979 ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
980 ASSIGN_WARNING_POINTER_INCOMPATIBLE,
981 ASSIGN_WARNING_POINTER_FROM_INT,
982 ASSIGN_WARNING_INT_FROM_POINTER
985 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
986 const expression_t *const right,
988 const source_position_t *source_position)
990 type_t *const orig_type_right = right->base.type;
991 type_t *const type_left = skip_typeref(orig_type_left);
992 type_t *const type_right = skip_typeref(orig_type_right);
997 case ASSIGN_ERROR_INCOMPATIBLE:
998 errorf(source_position,
999 "destination type '%T' in %s is incompatible with type '%T'",
1000 orig_type_left, context, orig_type_right);
1003 case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1004 type_t *points_to_left
1005 = skip_typeref(type_left->pointer.points_to);
1006 type_t *points_to_right
1007 = skip_typeref(type_right->pointer.points_to);
1009 /* the left type has all qualifiers from the right type */
1010 unsigned missing_qualifiers
1011 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1012 warningf(source_position,
1013 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1014 orig_type_left, context, orig_type_right, missing_qualifiers);
1018 case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1019 warningf(source_position,
1020 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1021 orig_type_left, context, right, orig_type_right);
1024 case ASSIGN_WARNING_POINTER_FROM_INT:
1025 warningf(source_position,
1026 "%s makes pointer '%T' from integer '%T' without a cast",
1027 context, orig_type_left, orig_type_right);
1030 case ASSIGN_WARNING_INT_FROM_POINTER:
1031 warningf(source_position,
1032 "%s makes integer '%T' from pointer '%T' without a cast",
1033 context, orig_type_left, orig_type_right);
1037 panic("invalid error value");
1041 /** Implements the rules from § 6.5.16.1 */
1042 static assign_error_t semantic_assign(type_t *orig_type_left,
1043 const expression_t *const right)
1045 type_t *const orig_type_right = right->base.type;
1046 type_t *const type_left = skip_typeref(orig_type_left);
1047 type_t *const type_right = skip_typeref(orig_type_right);
1049 if (is_type_pointer(type_left)) {
1050 if (is_null_pointer_constant(right)) {
1051 return ASSIGN_SUCCESS;
1052 } else if (is_type_pointer(type_right)) {
1053 type_t *points_to_left
1054 = skip_typeref(type_left->pointer.points_to);
1055 type_t *points_to_right
1056 = skip_typeref(type_right->pointer.points_to);
1057 assign_error_t res = ASSIGN_SUCCESS;
1059 /* the left type has all qualifiers from the right type */
1060 unsigned missing_qualifiers
1061 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1062 if (missing_qualifiers != 0) {
1063 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1066 points_to_left = get_unqualified_type(points_to_left);
1067 points_to_right = get_unqualified_type(points_to_right);
1069 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
1070 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1074 if (!types_compatible(points_to_left, points_to_right)) {
1075 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1079 } else if (is_type_integer(type_right)) {
1080 return ASSIGN_WARNING_POINTER_FROM_INT;
1082 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1083 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1084 && is_type_pointer(type_right))) {
1085 return ASSIGN_SUCCESS;
1086 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
1087 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1088 type_t *const unqual_type_left = get_unqualified_type(type_left);
1089 type_t *const unqual_type_right = get_unqualified_type(type_right);
1090 if (types_compatible(unqual_type_left, unqual_type_right)) {
1091 return ASSIGN_SUCCESS;
1093 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1094 return ASSIGN_WARNING_INT_FROM_POINTER;
1097 if (!is_type_valid(type_left) || !is_type_valid(type_right))
1098 return ASSIGN_SUCCESS;
1100 return ASSIGN_ERROR_INCOMPATIBLE;
1103 static expression_t *parse_constant_expression(void)
1105 /* start parsing at precedence 7 (conditional expression) */
1106 expression_t *result = parse_sub_expression(7);
1108 if (!is_constant_expression(result)) {
1109 errorf(&result->base.source_position,
1110 "expression '%E' is not constant\n", result);
1116 static expression_t *parse_assignment_expression(void)
1118 /* start parsing at precedence 2 (assignment expression) */
1119 return parse_sub_expression(2);
1122 static type_t *make_global_typedef(const char *name, type_t *type)
1124 symbol_t *const symbol = symbol_table_insert(name);
1126 declaration_t *const declaration = allocate_declaration_zero();
1127 declaration->namespc = NAMESPACE_NORMAL;
1128 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
1129 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1130 declaration->type = type;
1131 declaration->symbol = symbol;
1132 declaration->source_position = builtin_source_position;
1133 declaration->implicit = true;
1135 record_declaration(declaration, false);
1137 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1138 typedef_type->typedeft.declaration = declaration;
1140 return typedef_type;
1143 static string_t parse_string_literals(void)
1145 assert(token.type == T_STRING_LITERAL);
1146 string_t result = token.v.string;
1150 while (token.type == T_STRING_LITERAL) {
1151 result = concat_strings(&result, &token.v.string);
1158 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1159 [GNU_AK_CONST] = "const",
1160 [GNU_AK_VOLATILE] = "volatile",
1161 [GNU_AK_CDECL] = "cdecl",
1162 [GNU_AK_STDCALL] = "stdcall",
1163 [GNU_AK_FASTCALL] = "fastcall",
1164 [GNU_AK_DEPRECATED] = "deprecated",
1165 [GNU_AK_NOINLINE] = "noinline",
1166 [GNU_AK_NORETURN] = "noreturn",
1167 [GNU_AK_NAKED] = "naked",
1168 [GNU_AK_PURE] = "pure",
1169 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1170 [GNU_AK_MALLOC] = "malloc",
1171 [GNU_AK_WEAK] = "weak",
1172 [GNU_AK_CONSTRUCTOR] = "constructor",
1173 [GNU_AK_DESTRUCTOR] = "destructor",
1174 [GNU_AK_NOTHROW] = "nothrow",
1175 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1176 [GNU_AK_COMMON] = "common",
1177 [GNU_AK_NOCOMMON] = "nocommon",
1178 [GNU_AK_PACKED] = "packed",
1179 [GNU_AK_SHARED] = "shared",
1180 [GNU_AK_NOTSHARED] = "notshared",
1181 [GNU_AK_USED] = "used",
1182 [GNU_AK_UNUSED] = "unused",
1183 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1184 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1185 [GNU_AK_LONGCALL] = "longcall",
1186 [GNU_AK_SHORTCALL] = "shortcall",
1187 [GNU_AK_LONG_CALL] = "long_call",
1188 [GNU_AK_SHORT_CALL] = "short_call",
1189 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1190 [GNU_AK_INTERRUPT] = "interrupt",
1191 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1192 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1193 [GNU_AK_NESTING] = "nesting",
1194 [GNU_AK_NEAR] = "near",
1195 [GNU_AK_FAR] = "far",
1196 [GNU_AK_SIGNAL] = "signal",
1197 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1198 [GNU_AK_TINY_DATA] = "tiny_data",
1199 [GNU_AK_SAVEALL] = "saveall",
1200 [GNU_AK_FLATTEN] = "flatten",
1201 [GNU_AK_SSEREGPARM] = "sseregparm",
1202 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1203 [GNU_AK_RETURN_TWICE] = "return_twice",
1204 [GNU_AK_MAY_ALIAS] = "may_alias",
1205 [GNU_AK_MS_STRUCT] = "ms_struct",
1206 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1207 [GNU_AK_DLLIMPORT] = "dllimport",
1208 [GNU_AK_DLLEXPORT] = "dllexport",
1209 [GNU_AK_ALIGNED] = "aligned",
1210 [GNU_AK_ALIAS] = "alias",
1211 [GNU_AK_SECTION] = "section",
1212 [GNU_AK_FORMAT] = "format",
1213 [GNU_AK_FORMAT_ARG] = "format_arg",
1214 [GNU_AK_WEAKREF] = "weakref",
1215 [GNU_AK_NONNULL] = "nonnull",
1216 [GNU_AK_TLS_MODEL] = "tls_model",
1217 [GNU_AK_VISIBILITY] = "visibility",
1218 [GNU_AK_REGPARM] = "regparm",
1219 [GNU_AK_MODE] = "mode",
1220 [GNU_AK_MODEL] = "model",
1221 [GNU_AK_TRAP_EXIT] = "trap_exit",
1222 [GNU_AK_SP_SWITCH] = "sp_switch",
1223 [GNU_AK_SENTINEL] = "sentinel"
1227 * compare two string, ignoring double underscores on the second.
1229 static int strcmp_underscore(const char *s1, const char *s2)
1231 if (s2[0] == '_' && s2[1] == '_') {
1232 size_t len2 = strlen(s2);
1233 size_t len1 = strlen(s1);
1234 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1235 return strncmp(s1, s2+2, len2-4);
1239 return strcmp(s1, s2);
1243 * Allocate a new gnu temporal attribute.
1245 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1247 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1248 attribute->kind = kind;
1249 attribute->next = NULL;
1250 attribute->invalid = false;
1251 attribute->have_arguments = false;
1257 * parse one constant expression argument.
1259 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1261 expression_t *expression;
1262 add_anchor_token(')');
1263 expression = parse_constant_expression();
1264 rem_anchor_token(')');
1266 attribute->u.argument = fold_constant(expression);
1269 attribute->invalid = true;
1273 * parse a list of constant expressions arguments.
1275 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1277 argument_list_t **list = &attribute->u.arguments;
1278 argument_list_t *entry;
1279 expression_t *expression;
1280 add_anchor_token(')');
1281 add_anchor_token(',');
1283 expression = parse_constant_expression();
1284 entry = obstack_alloc(&temp_obst, sizeof(entry));
1285 entry->argument = fold_constant(expression);
1288 list = &entry->next;
1289 if (token.type != ',')
1293 rem_anchor_token(',');
1294 rem_anchor_token(')');
1298 attribute->invalid = true;
1302 * parse one string literal argument.
1304 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1307 add_anchor_token('(');
1308 if (token.type != T_STRING_LITERAL) {
1309 parse_error_expected("while parsing attribute directive",
1310 T_STRING_LITERAL, NULL);
1313 *string = parse_string_literals();
1314 rem_anchor_token('(');
1318 attribute->invalid = true;
1322 * parse one tls model.
1324 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1326 static const char *const tls_models[] = {
1332 string_t string = { NULL, 0 };
1333 parse_gnu_attribute_string_arg(attribute, &string);
1334 if (string.begin != NULL) {
1335 for(size_t i = 0; i < 4; ++i) {
1336 if (strcmp(tls_models[i], string.begin) == 0) {
1337 attribute->u.value = i;
1341 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1343 attribute->invalid = true;
1347 * parse one tls model.
1349 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1351 static const char *const visibilities[] = {
1357 string_t string = { NULL, 0 };
1358 parse_gnu_attribute_string_arg(attribute, &string);
1359 if (string.begin != NULL) {
1360 for(size_t i = 0; i < 4; ++i) {
1361 if (strcmp(visibilities[i], string.begin) == 0) {
1362 attribute->u.value = i;
1366 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1368 attribute->invalid = true;
1372 * parse one (code) model.
1374 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1376 static const char *const visibilities[] = {
1381 string_t string = { NULL, 0 };
1382 parse_gnu_attribute_string_arg(attribute, &string);
1383 if (string.begin != NULL) {
1384 for(int i = 0; i < 3; ++i) {
1385 if (strcmp(visibilities[i], string.begin) == 0) {
1386 attribute->u.value = i;
1390 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1392 attribute->invalid = true;
1395 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1397 /* TODO: find out what is allowed here... */
1399 /* at least: byte, word, pointer, list of machine modes
1400 * __XXX___ is interpreted as XXX */
1401 add_anchor_token(')');
1403 if (token.type != T_IDENTIFIER) {
1404 expect(T_IDENTIFIER);
1407 /* This isn't really correct, the backend should provide a list of machine
1408 * specific modes (according to gcc philosophy that is...) */
1409 const char *symbol_str = token.v.symbol->string;
1410 if (strcmp_underscore("QI", symbol_str) == 0 ||
1411 strcmp_underscore("byte", symbol_str) == 0) {
1412 attribute->u.akind = ATOMIC_TYPE_CHAR;
1413 } else if (strcmp_underscore("HI", symbol_str) == 0) {
1414 attribute->u.akind = ATOMIC_TYPE_SHORT;
1415 } else if (strcmp_underscore("SI", symbol_str) == 0
1416 || strcmp_underscore("word", symbol_str) == 0
1417 || strcmp_underscore("pointer", symbol_str) == 0) {
1418 attribute->u.akind = ATOMIC_TYPE_INT;
1419 } else if (strcmp_underscore("DI", symbol_str) == 0) {
1420 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1422 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1423 attribute->invalid = true;
1427 rem_anchor_token(')');
1431 attribute->invalid = true;
1435 * parse one interrupt argument.
1437 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1439 static const char *const interrupts[] = {
1446 string_t string = { NULL, 0 };
1447 parse_gnu_attribute_string_arg(attribute, &string);
1448 if (string.begin != NULL) {
1449 for(size_t i = 0; i < 5; ++i) {
1450 if (strcmp(interrupts[i], string.begin) == 0) {
1451 attribute->u.value = i;
1455 errorf(HERE, "'%s' is not an interrupt", string.begin);
1457 attribute->invalid = true;
1461 * parse ( identifier, const expression, const expression )
1463 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1465 static const char *const format_names[] = {
1473 if (token.type != T_IDENTIFIER) {
1474 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1477 const char *name = token.v.symbol->string;
1478 for(i = 0; i < 4; ++i) {
1479 if (strcmp_underscore(format_names[i], name) == 0)
1483 if (warning.attribute)
1484 warningf(HERE, "'%s' is an unrecognized format function type", name);
1489 add_anchor_token(')');
1490 add_anchor_token(',');
1491 parse_constant_expression();
1492 rem_anchor_token(',');
1493 rem_anchor_token(')');
1496 add_anchor_token(')');
1497 parse_constant_expression();
1498 rem_anchor_token(')');
1502 attribute->u.value = true;
1505 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1507 if (!attribute->have_arguments)
1510 /* should have no arguments */
1511 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1512 eat_until_matching_token('(');
1513 /* we have already consumed '(', so we stop before ')', eat it */
1515 attribute->invalid = true;
1519 * Parse one GNU attribute.
1521 * Note that attribute names can be specified WITH or WITHOUT
1522 * double underscores, ie const or __const__.
1524 * The following attributes are parsed without arguments
1549 * no_instrument_function
1550 * warn_unused_result
1567 * externally_visible
1575 * The following attributes are parsed with arguments
1576 * aligned( const expression )
1577 * alias( string literal )
1578 * section( string literal )
1579 * format( identifier, const expression, const expression )
1580 * format_arg( const expression )
1581 * tls_model( string literal )
1582 * visibility( string literal )
1583 * regparm( const expression )
1584 * model( string leteral )
1585 * trap_exit( const expression )
1586 * sp_switch( string literal )
1588 * The following attributes might have arguments
1589 * weak_ref( string literal )
1590 * non_null( const expression // ',' )
1591 * interrupt( string literal )
1592 * sentinel( constant expression )
1594 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1596 gnu_attribute_t *head = *attributes;
1597 gnu_attribute_t *last = *attributes;
1598 decl_modifiers_t modifiers = 0;
1599 gnu_attribute_t *attribute;
1601 eat(T___attribute__);
1605 if (token.type != ')') {
1606 /* find the end of the list */
1608 while (last->next != NULL)
1612 /* non-empty attribute list */
1615 if (token.type == T_const) {
1617 } else if (token.type == T_volatile) {
1619 } else if (token.type == T_cdecl) {
1620 /* __attribute__((cdecl)), WITH ms mode */
1622 } else if (token.type == T_IDENTIFIER) {
1623 const symbol_t *sym = token.v.symbol;
1626 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1633 for(i = 0; i < GNU_AK_LAST; ++i) {
1634 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1637 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1640 if (kind == GNU_AK_LAST) {
1641 if (warning.attribute)
1642 warningf(HERE, "'%s' attribute directive ignored", name);
1644 /* skip possible arguments */
1645 if (token.type == '(') {
1646 eat_until_matching_token(')');
1649 /* check for arguments */
1650 attribute = allocate_gnu_attribute(kind);
1651 if (token.type == '(') {
1653 if (token.type == ')') {
1654 /* empty args are allowed */
1657 attribute->have_arguments = true;
1662 case GNU_AK_VOLATILE:
1667 case GNU_AK_NOCOMMON:
1669 case GNU_AK_NOTSHARED:
1670 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1671 case GNU_AK_WARN_UNUSED_RESULT:
1672 case GNU_AK_LONGCALL:
1673 case GNU_AK_SHORTCALL:
1674 case GNU_AK_LONG_CALL:
1675 case GNU_AK_SHORT_CALL:
1676 case GNU_AK_FUNCTION_VECTOR:
1677 case GNU_AK_INTERRUPT_HANDLER:
1678 case GNU_AK_NMI_HANDLER:
1679 case GNU_AK_NESTING:
1683 case GNU_AK_EIGTHBIT_DATA:
1684 case GNU_AK_TINY_DATA:
1685 case GNU_AK_SAVEALL:
1686 case GNU_AK_FLATTEN:
1687 case GNU_AK_SSEREGPARM:
1688 case GNU_AK_EXTERNALLY_VISIBLE:
1689 case GNU_AK_RETURN_TWICE:
1690 case GNU_AK_MAY_ALIAS:
1691 case GNU_AK_MS_STRUCT:
1692 case GNU_AK_GCC_STRUCT:
1695 case GNU_AK_CDECL: modifiers |= DM_CDECL; goto no_arg;
1696 case GNU_AK_FASTCALL: modifiers |= DM_FASTCALL; goto no_arg;
1697 case GNU_AK_STDCALL: modifiers |= DM_STDCALL; goto no_arg;
1698 case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg;
1699 case GNU_AK_USED: modifiers |= DM_USED; goto no_arg;
1700 case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg;
1701 case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg;
1702 case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg;
1703 case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg;
1704 case GNU_AK_PACKED: modifiers |= DM_PACKED; goto no_arg;
1705 case GNU_AK_NOINLINE: modifiers |= DM_NOINLINE; goto no_arg;
1706 case GNU_AK_NORETURN: modifiers |= DM_NORETURN; goto no_arg;
1707 case GNU_AK_NOTHROW: modifiers |= DM_NOTHROW; goto no_arg;
1708 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1709 case GNU_AK_CONSTRUCTOR: modifiers |= DM_CONSTRUCTOR; goto no_arg;
1710 case GNU_AK_DESTRUCTOR: modifiers |= DM_DESTRUCTOR; goto no_arg;
1711 case GNU_AK_DEPRECATED: modifiers |= DM_DEPRECATED; goto no_arg;
1713 case GNU_AK_ALIGNED:
1714 /* __align__ may be used without an argument */
1715 if (attribute->have_arguments) {
1716 parse_gnu_attribute_const_arg(attribute);
1720 case GNU_AK_FORMAT_ARG:
1721 case GNU_AK_REGPARM:
1722 case GNU_AK_TRAP_EXIT:
1723 if (!attribute->have_arguments) {
1724 /* should have arguments */
1725 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1726 attribute->invalid = true;
1728 parse_gnu_attribute_const_arg(attribute);
1731 case GNU_AK_SECTION:
1732 case GNU_AK_SP_SWITCH:
1733 if (!attribute->have_arguments) {
1734 /* should have arguments */
1735 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1736 attribute->invalid = true;
1738 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1741 if (!attribute->have_arguments) {
1742 /* should have arguments */
1743 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1744 attribute->invalid = true;
1746 parse_gnu_attribute_format_args(attribute);
1748 case GNU_AK_WEAKREF:
1749 /* may have one string argument */
1750 if (attribute->have_arguments)
1751 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1753 case GNU_AK_NONNULL:
1754 if (attribute->have_arguments)
1755 parse_gnu_attribute_const_arg_list(attribute);
1757 case GNU_AK_TLS_MODEL:
1758 if (!attribute->have_arguments) {
1759 /* should have arguments */
1760 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1762 parse_gnu_attribute_tls_model_arg(attribute);
1764 case GNU_AK_VISIBILITY:
1765 if (!attribute->have_arguments) {
1766 /* should have arguments */
1767 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1769 parse_gnu_attribute_visibility_arg(attribute);
1772 if (!attribute->have_arguments) {
1773 /* should have arguments */
1774 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1776 parse_gnu_attribute_model_arg(attribute);
1780 if (!attribute->have_arguments) {
1781 /* should have arguments */
1782 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1784 parse_gnu_attribute_mode_arg(attribute);
1787 case GNU_AK_INTERRUPT:
1788 /* may have one string argument */
1789 if (attribute->have_arguments)
1790 parse_gnu_attribute_interrupt_arg(attribute);
1792 case GNU_AK_SENTINEL:
1793 /* may have one string argument */
1794 if (attribute->have_arguments)
1795 parse_gnu_attribute_const_arg(attribute);
1798 /* already handled */
1802 check_no_argument(attribute, name);
1805 if (attribute != NULL) {
1807 last->next = attribute;
1810 head = last = attribute;
1814 if (token.type != ',')
1828 * Parse GNU attributes.
1830 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1832 decl_modifiers_t modifiers = 0;
1835 switch(token.type) {
1836 case T___attribute__:
1837 modifiers |= parse_gnu_attribute(attributes);
1843 if (token.type != T_STRING_LITERAL) {
1844 parse_error_expected("while parsing assembler attribute",
1845 T_STRING_LITERAL, NULL);
1846 eat_until_matching_token('(');
1849 parse_string_literals();
1854 case T_cdecl: modifiers |= DM_CDECL; break;
1855 case T__fastcall: modifiers |= DM_FASTCALL; break;
1856 case T__stdcall: modifiers |= DM_STDCALL; break;
1859 /* TODO record modifier */
1860 warningf(HERE, "Ignoring declaration modifier %K", &token);
1864 default: return modifiers;
1871 static designator_t *parse_designation(void)
1873 designator_t *result = NULL;
1874 designator_t *last = NULL;
1877 designator_t *designator;
1878 switch(token.type) {
1880 designator = allocate_ast_zero(sizeof(designator[0]));
1881 designator->source_position = token.source_position;
1883 add_anchor_token(']');
1884 designator->array_index = parse_constant_expression();
1885 rem_anchor_token(']');
1889 designator = allocate_ast_zero(sizeof(designator[0]));
1890 designator->source_position = token.source_position;
1892 if (token.type != T_IDENTIFIER) {
1893 parse_error_expected("while parsing designator",
1894 T_IDENTIFIER, NULL);
1897 designator->symbol = token.v.symbol;
1905 assert(designator != NULL);
1907 last->next = designator;
1909 result = designator;
1917 static initializer_t *initializer_from_string(array_type_t *type,
1918 const string_t *const string)
1920 /* TODO: check len vs. size of array type */
1923 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1924 initializer->string.string = *string;
1929 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1930 wide_string_t *const string)
1932 /* TODO: check len vs. size of array type */
1935 initializer_t *const initializer =
1936 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1937 initializer->wide_string.string = *string;
1943 * Build an initializer from a given expression.
1945 static initializer_t *initializer_from_expression(type_t *orig_type,
1946 expression_t *expression)
1948 /* TODO check that expression is a constant expression */
1950 /* § 6.7.8.14/15 char array may be initialized by string literals */
1951 type_t *type = skip_typeref(orig_type);
1952 type_t *expr_type_orig = expression->base.type;
1953 type_t *expr_type = skip_typeref(expr_type_orig);
1954 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1955 array_type_t *const array_type = &type->array;
1956 type_t *const element_type = skip_typeref(array_type->element_type);
1958 if (element_type->kind == TYPE_ATOMIC) {
1959 atomic_type_kind_t akind = element_type->atomic.akind;
1960 switch (expression->kind) {
1961 case EXPR_STRING_LITERAL:
1962 if (akind == ATOMIC_TYPE_CHAR
1963 || akind == ATOMIC_TYPE_SCHAR
1964 || akind == ATOMIC_TYPE_UCHAR) {
1965 return initializer_from_string(array_type,
1966 &expression->string.value);
1969 case EXPR_WIDE_STRING_LITERAL: {
1970 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1971 if (get_unqualified_type(element_type) == bare_wchar_type) {
1972 return initializer_from_wide_string(array_type,
1973 &expression->wide_string.value);
1983 assign_error_t error = semantic_assign(type, expression);
1984 if (error == ASSIGN_ERROR_INCOMPATIBLE)
1986 report_assign_error(error, type, expression, "initializer",
1987 &expression->base.source_position);
1989 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1990 result->value.value = create_implicit_cast(expression, type);
1996 * Checks if a given expression can be used as an constant initializer.
1998 static bool is_initializer_constant(const expression_t *expression)
2000 return is_constant_expression(expression)
2001 || is_address_constant(expression);
2005 * Parses an scalar initializer.
2007 * § 6.7.8.11; eat {} without warning
2009 static initializer_t *parse_scalar_initializer(type_t *type,
2010 bool must_be_constant)
2012 /* there might be extra {} hierarchies */
2014 if (token.type == '{') {
2015 warningf(HERE, "extra curly braces around scalar initializer");
2019 } while (token.type == '{');
2022 expression_t *expression = parse_assignment_expression();
2023 if (must_be_constant && !is_initializer_constant(expression)) {
2024 errorf(&expression->base.source_position,
2025 "Initialisation expression '%E' is not constant\n",
2029 initializer_t *initializer = initializer_from_expression(type, expression);
2031 if (initializer == NULL) {
2032 errorf(&expression->base.source_position,
2033 "expression '%E' (type '%T') doesn't match expected type '%T'",
2034 expression, expression->base.type, type);
2039 bool additional_warning_displayed = false;
2040 while (braces > 0) {
2041 if (token.type == ',') {
2044 if (token.type != '}') {
2045 if (!additional_warning_displayed) {
2046 warningf(HERE, "additional elements in scalar initializer");
2047 additional_warning_displayed = true;
2058 * An entry in the type path.
2060 typedef struct type_path_entry_t type_path_entry_t;
2061 struct type_path_entry_t {
2062 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
2064 size_t index; /**< For array types: the current index. */
2065 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2070 * A type path expression a position inside compound or array types.
2072 typedef struct type_path_t type_path_t;
2073 struct type_path_t {
2074 type_path_entry_t *path; /**< An flexible array containing the current path. */
2075 type_t *top_type; /**< type of the element the path points */
2076 size_t max_index; /**< largest index in outermost array */
2080 * Prints a type path for debugging.
2082 static __attribute__((unused)) void debug_print_type_path(
2083 const type_path_t *path)
2085 size_t len = ARR_LEN(path->path);
2087 for(size_t i = 0; i < len; ++i) {
2088 const type_path_entry_t *entry = & path->path[i];
2090 type_t *type = skip_typeref(entry->type);
2091 if (is_type_compound(type)) {
2092 /* in gcc mode structs can have no members */
2093 if (entry->v.compound_entry == NULL) {
2097 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2098 } else if (is_type_array(type)) {
2099 fprintf(stderr, "[%zu]", entry->v.index);
2101 fprintf(stderr, "-INVALID-");
2104 if (path->top_type != NULL) {
2105 fprintf(stderr, " (");
2106 print_type(path->top_type);
2107 fprintf(stderr, ")");
2112 * Return the top type path entry, ie. in a path
2113 * (type).a.b returns the b.
2115 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2117 size_t len = ARR_LEN(path->path);
2119 return &path->path[len-1];
2123 * Enlarge the type path by an (empty) element.
2125 static type_path_entry_t *append_to_type_path(type_path_t *path)
2127 size_t len = ARR_LEN(path->path);
2128 ARR_RESIZE(type_path_entry_t, path->path, len+1);
2130 type_path_entry_t *result = & path->path[len];
2131 memset(result, 0, sizeof(result[0]));
2136 * Descending into a sub-type. Enter the scope of the current
2139 static void descend_into_subtype(type_path_t *path)
2141 type_t *orig_top_type = path->top_type;
2142 type_t *top_type = skip_typeref(orig_top_type);
2144 type_path_entry_t *top = append_to_type_path(path);
2145 top->type = top_type;
2147 if (is_type_compound(top_type)) {
2148 declaration_t *declaration = top_type->compound.declaration;
2149 declaration_t *entry = declaration->scope.declarations;
2150 top->v.compound_entry = entry;
2152 if (entry != NULL) {
2153 path->top_type = entry->type;
2155 path->top_type = NULL;
2157 } else if (is_type_array(top_type)) {
2159 path->top_type = top_type->array.element_type;
2161 assert(!is_type_valid(top_type));
2166 * Pop an entry from the given type path, ie. returning from
2167 * (type).a.b to (type).a
2169 static void ascend_from_subtype(type_path_t *path)
2171 type_path_entry_t *top = get_type_path_top(path);
2173 path->top_type = top->type;
2175 size_t len = ARR_LEN(path->path);
2176 ARR_RESIZE(type_path_entry_t, path->path, len-1);
2180 * Pop entries from the given type path until the given
2181 * path level is reached.
2183 static void ascend_to(type_path_t *path, size_t top_path_level)
2185 size_t len = ARR_LEN(path->path);
2187 while (len > top_path_level) {
2188 ascend_from_subtype(path);
2189 len = ARR_LEN(path->path);
2193 static bool walk_designator(type_path_t *path, const designator_t *designator,
2194 bool used_in_offsetof)
2196 for( ; designator != NULL; designator = designator->next) {
2197 type_path_entry_t *top = get_type_path_top(path);
2198 type_t *orig_type = top->type;
2200 type_t *type = skip_typeref(orig_type);
2202 if (designator->symbol != NULL) {
2203 symbol_t *symbol = designator->symbol;
2204 if (!is_type_compound(type)) {
2205 if (is_type_valid(type)) {
2206 errorf(&designator->source_position,
2207 "'.%Y' designator used for non-compound type '%T'",
2213 declaration_t *declaration = type->compound.declaration;
2214 declaration_t *iter = declaration->scope.declarations;
2215 for( ; iter != NULL; iter = iter->next) {
2216 if (iter->symbol == symbol) {
2221 errorf(&designator->source_position,
2222 "'%T' has no member named '%Y'", orig_type, symbol);
2225 if (used_in_offsetof) {
2226 type_t *real_type = skip_typeref(iter->type);
2227 if (real_type->kind == TYPE_BITFIELD) {
2228 errorf(&designator->source_position,
2229 "offsetof designator '%Y' may not specify bitfield",
2235 top->type = orig_type;
2236 top->v.compound_entry = iter;
2237 orig_type = iter->type;
2239 expression_t *array_index = designator->array_index;
2240 assert(designator->array_index != NULL);
2242 if (!is_type_array(type)) {
2243 if (is_type_valid(type)) {
2244 errorf(&designator->source_position,
2245 "[%E] designator used for non-array type '%T'",
2246 array_index, orig_type);
2250 if (!is_type_valid(array_index->base.type)) {
2254 long index = fold_constant(array_index);
2255 if (!used_in_offsetof) {
2257 errorf(&designator->source_position,
2258 "array index [%E] must be positive", array_index);
2261 if (type->array.size_constant == true) {
2262 long array_size = type->array.size;
2263 if (index >= array_size) {
2264 errorf(&designator->source_position,
2265 "designator [%E] (%d) exceeds array size %d",
2266 array_index, index, array_size);
2272 top->type = orig_type;
2273 top->v.index = (size_t) index;
2274 orig_type = type->array.element_type;
2276 path->top_type = orig_type;
2278 if (designator->next != NULL) {
2279 descend_into_subtype(path);
2288 static void advance_current_object(type_path_t *path, size_t top_path_level)
2290 type_path_entry_t *top = get_type_path_top(path);
2292 type_t *type = skip_typeref(top->type);
2293 if (is_type_union(type)) {
2294 /* in unions only the first element is initialized */
2295 top->v.compound_entry = NULL;
2296 } else if (is_type_struct(type)) {
2297 declaration_t *entry = top->v.compound_entry;
2299 entry = entry->next;
2300 top->v.compound_entry = entry;
2301 if (entry != NULL) {
2302 path->top_type = entry->type;
2306 assert(is_type_array(type));
2310 if (!type->array.size_constant || top->v.index < type->array.size) {
2315 /* we're past the last member of the current sub-aggregate, try if we
2316 * can ascend in the type hierarchy and continue with another subobject */
2317 size_t len = ARR_LEN(path->path);
2319 if (len > top_path_level) {
2320 ascend_from_subtype(path);
2321 advance_current_object(path, top_path_level);
2323 path->top_type = NULL;
2328 * skip until token is found.
2330 static void skip_until(int type)
2332 while (token.type != type) {
2333 if (token.type == T_EOF)
2340 * skip any {...} blocks until a closing bracket is reached.
2342 static void skip_initializers(void)
2344 if (token.type == '{')
2347 while (token.type != '}') {
2348 if (token.type == T_EOF)
2350 if (token.type == '{') {
2358 static initializer_t *create_empty_initializer(void)
2360 static initializer_t empty_initializer
2361 = { .list = { { INITIALIZER_LIST }, 0 } };
2362 return &empty_initializer;
2366 * Parse a part of an initialiser for a struct or union,
2368 static initializer_t *parse_sub_initializer(type_path_t *path,
2369 type_t *outer_type, size_t top_path_level,
2370 parse_initializer_env_t *env)
2372 if (token.type == '}') {
2373 /* empty initializer */
2374 return create_empty_initializer();
2377 type_t *orig_type = path->top_type;
2378 type_t *type = NULL;
2380 if (orig_type == NULL) {
2381 /* We are initializing an empty compound. */
2383 type = skip_typeref(orig_type);
2385 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2386 * initializers in this case. */
2387 if (!is_type_valid(type)) {
2388 skip_initializers();
2389 return create_empty_initializer();
2393 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2396 designator_t *designator = NULL;
2397 if (token.type == '.' || token.type == '[') {
2398 designator = parse_designation();
2399 goto finish_designator;
2400 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2401 /* GNU-style designator ("identifier: value") */
2402 designator = allocate_ast_zero(sizeof(designator[0]));
2403 designator->source_position = token.source_position;
2404 designator->symbol = token.v.symbol;
2409 /* reset path to toplevel, evaluate designator from there */
2410 ascend_to(path, top_path_level);
2411 if (!walk_designator(path, designator, false)) {
2412 /* can't continue after designation error */
2416 initializer_t *designator_initializer
2417 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2418 designator_initializer->designator.designator = designator;
2419 ARR_APP1(initializer_t*, initializers, designator_initializer);
2421 orig_type = path->top_type;
2422 type = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2427 if (token.type == '{') {
2428 if (type != NULL && is_type_scalar(type)) {
2429 sub = parse_scalar_initializer(type, env->must_be_constant);
2433 if (env->declaration != NULL) {
2434 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2435 env->declaration->symbol);
2437 errorf(HERE, "extra brace group at end of initializer");
2440 descend_into_subtype(path);
2442 add_anchor_token('}');
2443 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2445 rem_anchor_token('}');
2448 ascend_from_subtype(path);
2452 goto error_parse_next;
2456 /* must be an expression */
2457 expression_t *expression = parse_assignment_expression();
2459 if (env->must_be_constant && !is_initializer_constant(expression)) {
2460 errorf(&expression->base.source_position,
2461 "Initialisation expression '%E' is not constant\n",
2466 /* we are already outside, ... */
2467 if (is_type_compound(outer_type) &&
2468 !outer_type->compound.declaration->init.complete) {
2469 goto error_parse_next;
2474 /* handle { "string" } special case */
2475 if ((expression->kind == EXPR_STRING_LITERAL
2476 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2477 && outer_type != NULL) {
2478 sub = initializer_from_expression(outer_type, expression);
2480 if (token.type == ',') {
2483 if (token.type != '}') {
2484 warningf(HERE, "excessive elements in initializer for type '%T'",
2487 /* TODO: eat , ... */
2492 /* descend into subtypes until expression matches type */
2494 orig_type = path->top_type;
2495 type = skip_typeref(orig_type);
2497 sub = initializer_from_expression(orig_type, expression);
2501 if (!is_type_valid(type)) {
2504 if (is_type_scalar(type)) {
2505 errorf(&expression->base.source_position,
2506 "expression '%E' doesn't match expected type '%T'",
2507 expression, orig_type);
2511 descend_into_subtype(path);
2515 /* update largest index of top array */
2516 const type_path_entry_t *first = &path->path[0];
2517 type_t *first_type = first->type;
2518 first_type = skip_typeref(first_type);
2519 if (is_type_array(first_type)) {
2520 size_t index = first->v.index;
2521 if (index > path->max_index)
2522 path->max_index = index;
2526 /* append to initializers list */
2527 ARR_APP1(initializer_t*, initializers, sub);
2530 if (env->declaration != NULL)
2531 warningf(HERE, "excess elements in struct initializer for '%Y'",
2532 env->declaration->symbol);
2534 warningf(HERE, "excess elements in struct initializer");
2538 if (token.type == '}') {
2542 if (token.type == '}') {
2547 /* advance to the next declaration if we are not at the end */
2548 advance_current_object(path, top_path_level);
2549 orig_type = path->top_type;
2550 if (orig_type != NULL)
2551 type = skip_typeref(orig_type);
2557 size_t len = ARR_LEN(initializers);
2558 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2559 initializer_t *result = allocate_ast_zero(size);
2560 result->kind = INITIALIZER_LIST;
2561 result->list.len = len;
2562 memcpy(&result->list.initializers, initializers,
2563 len * sizeof(initializers[0]));
2565 DEL_ARR_F(initializers);
2566 ascend_to(path, top_path_level+1);
2571 skip_initializers();
2572 DEL_ARR_F(initializers);
2573 ascend_to(path, top_path_level+1);
2578 * Parses an initializer. Parsers either a compound literal
2579 * (env->declaration == NULL) or an initializer of a declaration.
2581 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2583 type_t *type = skip_typeref(env->type);
2584 initializer_t *result = NULL;
2587 if (is_type_scalar(type)) {
2588 result = parse_scalar_initializer(type, env->must_be_constant);
2589 } else if (token.type == '{') {
2593 memset(&path, 0, sizeof(path));
2594 path.top_type = env->type;
2595 path.path = NEW_ARR_F(type_path_entry_t, 0);
2597 descend_into_subtype(&path);
2599 add_anchor_token('}');
2600 result = parse_sub_initializer(&path, env->type, 1, env);
2601 rem_anchor_token('}');
2603 max_index = path.max_index;
2604 DEL_ARR_F(path.path);
2608 /* parse_scalar_initializer() also works in this case: we simply
2609 * have an expression without {} around it */
2610 result = parse_scalar_initializer(type, env->must_be_constant);
2613 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2614 * the array type size */
2615 if (is_type_array(type) && type->array.size_expression == NULL
2616 && result != NULL) {
2618 switch (result->kind) {
2619 case INITIALIZER_LIST:
2620 size = max_index + 1;
2623 case INITIALIZER_STRING:
2624 size = result->string.string.size;
2627 case INITIALIZER_WIDE_STRING:
2628 size = result->wide_string.string.size;
2631 case INITIALIZER_DESIGNATOR:
2632 case INITIALIZER_VALUE:
2633 /* can happen for parse errors */
2638 internal_errorf(HERE, "invalid initializer type");
2641 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2642 cnst->base.type = type_size_t;
2643 cnst->conste.v.int_value = size;
2645 type_t *new_type = duplicate_type(type);
2647 new_type->array.size_expression = cnst;
2648 new_type->array.size_constant = true;
2649 new_type->array.size = size;
2650 env->type = new_type;
2658 static declaration_t *append_declaration(declaration_t *declaration);
2660 static declaration_t *parse_compound_type_specifier(bool is_struct)
2662 gnu_attribute_t *attributes = NULL;
2663 decl_modifiers_t modifiers = 0;
2670 symbol_t *symbol = NULL;
2671 declaration_t *declaration = NULL;
2673 if (token.type == T___attribute__) {
2674 modifiers |= parse_attributes(&attributes);
2677 if (token.type == T_IDENTIFIER) {
2678 symbol = token.v.symbol;
2681 namespace_t const namespc =
2682 is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2683 declaration = get_declaration(symbol, namespc);
2684 if (declaration != NULL) {
2685 if (declaration->parent_scope != scope &&
2686 (token.type == '{' || token.type == ';')) {
2688 } else if (declaration->init.complete &&
2689 token.type == '{') {
2690 assert(symbol != NULL);
2691 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2692 is_struct ? "struct" : "union", symbol,
2693 &declaration->source_position);
2694 declaration->scope.declarations = NULL;
2697 } else if (token.type != '{') {
2699 parse_error_expected("while parsing struct type specifier",
2700 T_IDENTIFIER, '{', NULL);
2702 parse_error_expected("while parsing union type specifier",
2703 T_IDENTIFIER, '{', NULL);
2709 if (declaration == NULL) {
2710 declaration = allocate_declaration_zero();
2711 declaration->namespc =
2712 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2713 declaration->source_position = token.source_position;
2714 declaration->symbol = symbol;
2715 declaration->parent_scope = scope;
2716 if (symbol != NULL) {
2717 environment_push(declaration);
2719 append_declaration(declaration);
2722 if (token.type == '{') {
2723 declaration->init.complete = true;
2725 parse_compound_type_entries(declaration);
2726 modifiers |= parse_attributes(&attributes);
2729 declaration->modifiers |= modifiers;
2733 static void parse_enum_entries(type_t *const enum_type)
2737 if (token.type == '}') {
2739 errorf(HERE, "empty enum not allowed");
2743 add_anchor_token('}');
2745 if (token.type != T_IDENTIFIER) {
2746 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2748 rem_anchor_token('}');
2752 declaration_t *const entry = allocate_declaration_zero();
2753 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2754 entry->type = enum_type;
2755 entry->symbol = token.v.symbol;
2756 entry->source_position = token.source_position;
2759 if (token.type == '=') {
2761 expression_t *value = parse_constant_expression();
2763 value = create_implicit_cast(value, enum_type);
2764 entry->init.enum_value = value;
2769 record_declaration(entry, false);
2771 if (token.type != ',')
2774 } while (token.type != '}');
2775 rem_anchor_token('}');
2783 static type_t *parse_enum_specifier(void)
2785 gnu_attribute_t *attributes = NULL;
2786 declaration_t *declaration;
2790 if (token.type == T_IDENTIFIER) {
2791 symbol = token.v.symbol;
2794 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2795 } else if (token.type != '{') {
2796 parse_error_expected("while parsing enum type specifier",
2797 T_IDENTIFIER, '{', NULL);
2804 if (declaration == NULL) {
2805 declaration = allocate_declaration_zero();
2806 declaration->namespc = NAMESPACE_ENUM;
2807 declaration->source_position = token.source_position;
2808 declaration->symbol = symbol;
2809 declaration->parent_scope = scope;
2812 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2813 type->enumt.declaration = declaration;
2815 if (token.type == '{') {
2816 if (declaration->init.complete) {
2817 errorf(HERE, "multiple definitions of enum %Y", symbol);
2819 if (symbol != NULL) {
2820 environment_push(declaration);
2822 append_declaration(declaration);
2823 declaration->init.complete = true;
2825 parse_enum_entries(type);
2826 parse_attributes(&attributes);
2833 * if a symbol is a typedef to another type, return true
2835 static bool is_typedef_symbol(symbol_t *symbol)
2837 const declaration_t *const declaration =
2838 get_declaration(symbol, NAMESPACE_NORMAL);
2840 declaration != NULL &&
2841 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2844 static type_t *parse_typeof(void)
2851 add_anchor_token(')');
2853 expression_t *expression = NULL;
2855 bool old_type_prop = in_type_prop;
2856 bool old_gcc_extension = in_gcc_extension;
2857 in_type_prop = true;
2859 while (token.type == T___extension__) {
2860 /* This can be a prefix to a typename or an expression. */
2862 in_gcc_extension = true;
2864 switch (token.type) {
2866 if (is_typedef_symbol(token.v.symbol)) {
2867 type = parse_typename();
2869 expression = parse_expression();
2870 type = expression->base.type;
2875 type = parse_typename();
2879 expression = parse_expression();
2880 type = expression->base.type;
2883 in_type_prop = old_type_prop;
2884 in_gcc_extension = old_gcc_extension;
2886 rem_anchor_token(')');
2889 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2890 typeof_type->typeoft.expression = expression;
2891 typeof_type->typeoft.typeof_type = type;
2898 typedef enum specifiers_t {
2899 SPECIFIER_SIGNED = 1 << 0,
2900 SPECIFIER_UNSIGNED = 1 << 1,
2901 SPECIFIER_LONG = 1 << 2,
2902 SPECIFIER_INT = 1 << 3,
2903 SPECIFIER_DOUBLE = 1 << 4,
2904 SPECIFIER_CHAR = 1 << 5,
2905 SPECIFIER_SHORT = 1 << 6,
2906 SPECIFIER_LONG_LONG = 1 << 7,
2907 SPECIFIER_FLOAT = 1 << 8,
2908 SPECIFIER_BOOL = 1 << 9,
2909 SPECIFIER_VOID = 1 << 10,
2910 SPECIFIER_INT8 = 1 << 11,
2911 SPECIFIER_INT16 = 1 << 12,
2912 SPECIFIER_INT32 = 1 << 13,
2913 SPECIFIER_INT64 = 1 << 14,
2914 SPECIFIER_INT128 = 1 << 15,
2915 SPECIFIER_COMPLEX = 1 << 16,
2916 SPECIFIER_IMAGINARY = 1 << 17,
2919 static type_t *create_builtin_type(symbol_t *const symbol,
2920 type_t *const real_type)
2922 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2923 type->builtin.symbol = symbol;
2924 type->builtin.real_type = real_type;
2926 type_t *result = typehash_insert(type);
2927 if (type != result) {
2934 static type_t *get_typedef_type(symbol_t *symbol)
2936 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2937 if (declaration == NULL ||
2938 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2941 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2942 type->typedeft.declaration = declaration;
2948 * check for the allowed MS alignment values.
2950 static bool check_alignment_value(long long intvalue)
2952 if (intvalue < 1 || intvalue > 8192) {
2953 errorf(HERE, "illegal alignment value");
2956 unsigned v = (unsigned)intvalue;
2957 for (unsigned i = 1; i <= 8192; i += i) {
2961 errorf(HERE, "alignment must be power of two");
2965 #define DET_MOD(name, tag) do { \
2966 if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2967 *modifiers |= tag; \
2970 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2972 decl_modifiers_t *modifiers = &specifiers->modifiers;
2975 if (token.type == T_restrict) {
2977 DET_MOD(restrict, DM_RESTRICT);
2979 } else if (token.type != T_IDENTIFIER)
2981 symbol_t *symbol = token.v.symbol;
2982 if (symbol == sym_align) {
2985 if (token.type != T_INTEGER)
2987 if (check_alignment_value(token.v.intvalue)) {
2988 if (specifiers->alignment != 0)
2989 warningf(HERE, "align used more than once");
2990 specifiers->alignment = (unsigned char)token.v.intvalue;
2994 } else if (symbol == sym_allocate) {
2997 if (token.type != T_IDENTIFIER)
2999 (void)token.v.symbol;
3001 } else if (symbol == sym_dllimport) {
3003 DET_MOD(dllimport, DM_DLLIMPORT);
3004 } else if (symbol == sym_dllexport) {
3006 DET_MOD(dllexport, DM_DLLEXPORT);
3007 } else if (symbol == sym_thread) {
3009 DET_MOD(thread, DM_THREAD);
3010 } else if (symbol == sym_naked) {
3012 DET_MOD(naked, DM_NAKED);
3013 } else if (symbol == sym_noinline) {
3015 DET_MOD(noinline, DM_NOINLINE);
3016 } else if (symbol == sym_noreturn) {
3018 DET_MOD(noreturn, DM_NORETURN);
3019 } else if (symbol == sym_nothrow) {
3021 DET_MOD(nothrow, DM_NOTHROW);
3022 } else if (symbol == sym_novtable) {
3024 DET_MOD(novtable, DM_NOVTABLE);
3025 } else if (symbol == sym_property) {
3029 bool is_get = false;
3030 if (token.type != T_IDENTIFIER)
3032 if (token.v.symbol == sym_get) {
3034 } else if (token.v.symbol == sym_put) {
3036 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3041 if (token.type != T_IDENTIFIER)
3044 if (specifiers->get_property_sym != NULL) {
3045 errorf(HERE, "get property name already specified");
3047 specifiers->get_property_sym = token.v.symbol;
3050 if (specifiers->put_property_sym != NULL) {
3051 errorf(HERE, "put property name already specified");
3053 specifiers->put_property_sym = token.v.symbol;
3057 if (token.type == ',') {
3064 } else if (symbol == sym_selectany) {
3066 DET_MOD(selectany, DM_SELECTANY);
3067 } else if (symbol == sym_uuid) {
3070 if (token.type != T_STRING_LITERAL)
3074 } else if (symbol == sym_deprecated) {
3076 if (specifiers->deprecated != 0)
3077 warningf(HERE, "deprecated used more than once");
3078 specifiers->deprecated = 1;
3079 if (token.type == '(') {
3081 if (token.type == T_STRING_LITERAL) {
3082 specifiers->deprecated_string = token.v.string.begin;
3085 errorf(HERE, "string literal expected");
3089 } else if (symbol == sym_noalias) {
3091 DET_MOD(noalias, DM_NOALIAS);
3093 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3095 if (token.type == '(')
3099 if (token.type == ',')
3106 static declaration_t *create_error_declaration(symbol_t *symbol, storage_class_tag_t storage_class)
3108 declaration_t *const decl = allocate_declaration_zero();
3109 decl->source_position = *HERE;
3110 decl->declared_storage_class = storage_class;
3111 decl->storage_class =
3112 storage_class != STORAGE_CLASS_NONE || scope == file_scope ?
3113 storage_class : STORAGE_CLASS_AUTO;
3114 decl->symbol = symbol;
3115 decl->implicit = true;
3116 record_declaration(decl, false);
3121 * Finish the construction of a struct type by calculating
3122 * its size, offsets, alignment.
3124 static void finish_struct_type(compound_type_t *type) {
3125 if (type->declaration == NULL)
3127 declaration_t *struct_decl = type->declaration;
3128 if (! struct_decl->init.complete)
3133 il_alignment_t alignment = 1;
3134 bool need_pad = false;
3136 declaration_t *entry = struct_decl->scope.declarations;
3137 for (; entry != NULL; entry = entry->next) {
3138 if (entry->namespc != NAMESPACE_NORMAL)
3141 type_t *m_type = skip_typeref(entry->type);
3142 if (! is_type_valid(m_type)) {
3143 /* simply ignore errors here */
3146 il_alignment_t m_alignment = m_type->base.alignment;
3147 if (m_alignment > alignment)
3148 alignment = m_alignment;
3150 offset = (size + m_alignment - 1) & -m_alignment;
3154 entry->offset = offset;
3155 size = offset + m_type->base.size;
3157 if (type->base.alignment != 0) {
3158 alignment = type->base.alignment;
3161 offset = (size + alignment - 1) & -alignment;
3165 if (warning.padded && need_pad) {
3166 warningf(&struct_decl->source_position,
3167 "'%#T' needs padding", type, struct_decl->symbol);
3169 if (warning.packed && !need_pad) {
3170 warningf(&struct_decl->source_position,
3171 "superfluous packed attribute on '%#T'",
3172 type, struct_decl->symbol);
3175 type->base.size = offset;
3176 type->base.alignment = alignment;
3180 * Finish the construction of an union type by calculating
3181 * its size and alignment.
3183 static void finish_union_type(compound_type_t *type) {
3184 if (type->declaration == NULL)
3186 declaration_t *union_decl = type->declaration;
3187 if (! union_decl->init.complete)
3191 il_alignment_t alignment = 1;
3193 declaration_t *entry = union_decl->scope.declarations;
3194 for (; entry != NULL; entry = entry->next) {
3195 if (entry->namespc != NAMESPACE_NORMAL)
3198 type_t *m_type = skip_typeref(entry->type);
3199 if (! is_type_valid(m_type))
3203 if (m_type->base.size > size)
3204 size = m_type->base.size;
3205 if (m_type->base.alignment > alignment)
3206 alignment = m_type->base.alignment;
3208 if (type->base.alignment != 0) {
3209 alignment = type->base.alignment;
3211 size = (size + alignment - 1) & -alignment;
3212 type->base.size = size;
3213 type->base.alignment = alignment;
3216 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3218 type_t *type = NULL;
3219 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3220 type_modifiers_t modifiers = TYPE_MODIFIER_NONE;
3221 unsigned type_specifiers = 0;
3222 bool newtype = false;
3223 bool saw_error = false;
3224 bool old_gcc_extension = in_gcc_extension;
3226 specifiers->source_position = token.source_position;
3229 specifiers->modifiers
3230 |= parse_attributes(&specifiers->gnu_attributes);
3231 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3232 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3234 switch (token.type) {
3237 #define MATCH_STORAGE_CLASS(token, class) \
3239 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3240 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3242 specifiers->declared_storage_class = class; \
3246 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
3247 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
3248 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
3249 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
3250 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3255 add_anchor_token(')');
3256 parse_microsoft_extended_decl_modifier(specifiers);
3257 rem_anchor_token(')');
3262 switch (specifiers->declared_storage_class) {
3263 case STORAGE_CLASS_NONE:
3264 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3267 case STORAGE_CLASS_EXTERN:
3268 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3271 case STORAGE_CLASS_STATIC:
3272 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3276 errorf(HERE, "multiple storage classes in declaration specifiers");
3282 /* type qualifiers */
3283 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
3285 qualifiers |= qualifier; \
3289 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3290 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3291 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3292 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3293 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3294 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3295 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3296 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3298 case T___extension__:
3300 in_gcc_extension = true;
3303 /* type specifiers */
3304 #define MATCH_SPECIFIER(token, specifier, name) \
3307 if (type_specifiers & specifier) { \
3308 errorf(HERE, "multiple " name " type specifiers given"); \
3310 type_specifiers |= specifier; \
3314 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void");
3315 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char");
3316 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short");
3317 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int");
3318 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float");
3319 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double");
3320 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed");
3321 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned");
3322 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool");
3323 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8");
3324 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16");
3325 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32");
3326 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64");
3327 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128");
3328 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex");
3329 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3331 case T__forceinline:
3332 /* only in microsoft mode */
3333 specifiers->modifiers |= DM_FORCEINLINE;
3338 specifiers->is_inline = true;
3343 if (type_specifiers & SPECIFIER_LONG_LONG) {
3344 errorf(HERE, "multiple type specifiers given");
3345 } else if (type_specifiers & SPECIFIER_LONG) {
3346 type_specifiers |= SPECIFIER_LONG_LONG;
3348 type_specifiers |= SPECIFIER_LONG;
3353 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3355 type->compound.declaration = parse_compound_type_specifier(true);
3356 finish_struct_type(&type->compound);
3360 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3361 type->compound.declaration = parse_compound_type_specifier(false);
3362 if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3363 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3364 finish_union_type(&type->compound);
3368 type = parse_enum_specifier();
3371 type = parse_typeof();
3373 case T___builtin_va_list:
3374 type = duplicate_type(type_valist);
3378 case T_IDENTIFIER: {
3379 /* only parse identifier if we haven't found a type yet */
3380 if (type != NULL || type_specifiers != 0) {
3381 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3382 * declaration, so it doesn't generate errors about expecting '(' or
3384 switch (look_ahead(1)->type) {
3391 case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3394 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3399 goto finish_specifiers;
3403 type_t *const typedef_type = get_typedef_type(token.v.symbol);
3404 if (typedef_type == NULL) {
3405 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3406 * declaration, so it doesn't generate 'implicit int' followed by more
3407 * errors later on. */
3408 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3413 errorf(HERE, "%K does not name a type", &token);
3415 declaration_t *const decl =
3416 create_error_declaration(token.v.symbol, STORAGE_CLASS_TYPEDEF);
3418 type = allocate_type_zero(TYPE_TYPEDEF, HERE);
3419 type->typedeft.declaration = decl;
3423 if (la1_type == '*')
3424 goto finish_specifiers;
3429 goto finish_specifiers;
3434 type = typedef_type;
3438 /* function specifier */
3440 goto finish_specifiers;
3445 in_gcc_extension = old_gcc_extension;
3447 if (type == NULL || (saw_error && type_specifiers != 0)) {
3448 atomic_type_kind_t atomic_type;
3450 /* match valid basic types */
3451 switch(type_specifiers) {
3452 case SPECIFIER_VOID:
3453 atomic_type = ATOMIC_TYPE_VOID;
3455 case SPECIFIER_CHAR:
3456 atomic_type = ATOMIC_TYPE_CHAR;
3458 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3459 atomic_type = ATOMIC_TYPE_SCHAR;
3461 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3462 atomic_type = ATOMIC_TYPE_UCHAR;
3464 case SPECIFIER_SHORT:
3465 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3466 case SPECIFIER_SHORT | SPECIFIER_INT:
3467 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3468 atomic_type = ATOMIC_TYPE_SHORT;
3470 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3471 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3472 atomic_type = ATOMIC_TYPE_USHORT;
3475 case SPECIFIER_SIGNED:
3476 case SPECIFIER_SIGNED | SPECIFIER_INT:
3477 atomic_type = ATOMIC_TYPE_INT;
3479 case SPECIFIER_UNSIGNED:
3480 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3481 atomic_type = ATOMIC_TYPE_UINT;
3483 case SPECIFIER_LONG:
3484 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3485 case SPECIFIER_LONG | SPECIFIER_INT:
3486 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3487 atomic_type = ATOMIC_TYPE_LONG;
3489 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3490 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3491 atomic_type = ATOMIC_TYPE_ULONG;
3494 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3495 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3496 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3497 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3499 atomic_type = ATOMIC_TYPE_LONGLONG;
3500 goto warn_about_long_long;
3502 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3503 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3505 atomic_type = ATOMIC_TYPE_ULONGLONG;
3506 warn_about_long_long:
3507 if (warning.long_long) {
3508 warningf(&specifiers->source_position,
3509 "ISO C90 does not support 'long long'");
3513 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3514 atomic_type = unsigned_int8_type_kind;
3517 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3518 atomic_type = unsigned_int16_type_kind;
3521 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3522 atomic_type = unsigned_int32_type_kind;
3525 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3526 atomic_type = unsigned_int64_type_kind;
3529 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3530 atomic_type = unsigned_int128_type_kind;
3533 case SPECIFIER_INT8:
3534 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3535 atomic_type = int8_type_kind;
3538 case SPECIFIER_INT16:
3539 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3540 atomic_type = int16_type_kind;
3543 case SPECIFIER_INT32:
3544 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3545 atomic_type = int32_type_kind;
3548 case SPECIFIER_INT64:
3549 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3550 atomic_type = int64_type_kind;
3553 case SPECIFIER_INT128:
3554 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3555 atomic_type = int128_type_kind;
3558 case SPECIFIER_FLOAT:
3559 atomic_type = ATOMIC_TYPE_FLOAT;
3561 case SPECIFIER_DOUBLE:
3562 atomic_type = ATOMIC_TYPE_DOUBLE;
3564 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3565 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3567 case SPECIFIER_BOOL:
3568 atomic_type = ATOMIC_TYPE_BOOL;
3570 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3571 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3572 atomic_type = ATOMIC_TYPE_FLOAT;
3574 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3575 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3576 atomic_type = ATOMIC_TYPE_DOUBLE;
3578 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3579 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3580 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3583 /* invalid specifier combination, give an error message */
3584 if (type_specifiers == 0) {
3589 if (warning.implicit_int) {
3590 warningf(HERE, "no type specifiers in declaration, using 'int'");
3592 atomic_type = ATOMIC_TYPE_INT;
3595 errorf(HERE, "no type specifiers given in declaration");
3597 } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3598 (type_specifiers & SPECIFIER_UNSIGNED)) {
3599 errorf(HERE, "signed and unsigned specifiers given");
3600 } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3601 errorf(HERE, "only integer types can be signed or unsigned");
3603 errorf(HERE, "multiple datatypes in declaration");
3608 if (type_specifiers & SPECIFIER_COMPLEX) {
3609 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3610 type->complex.akind = atomic_type;
3611 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3612 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3613 type->imaginary.akind = atomic_type;
3615 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3616 type->atomic.akind = atomic_type;
3619 } else if (type_specifiers != 0) {
3620 errorf(HERE, "multiple datatypes in declaration");
3623 /* FIXME: check type qualifiers here */
3625 type->base.qualifiers = qualifiers;
3626 type->base.modifiers = modifiers;
3628 type_t *result = typehash_insert(type);
3629 if (newtype && result != type) {
3633 specifiers->type = result;
3637 specifiers->type = type_error_type;
3641 static type_qualifiers_t parse_type_qualifiers(void)
3643 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3646 switch(token.type) {
3647 /* type qualifiers */
3648 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3649 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3650 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3651 /* microsoft extended type modifiers */
3652 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3653 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3654 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3655 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3656 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3665 * Parses an K&R identifier list and return a list of declarations.
3667 * @param last points to the last declaration in the list
3668 * @return the list of declarations
3670 static declaration_t *parse_identifier_list(declaration_t **last)
3672 declaration_t *declarations = NULL;
3673 declaration_t *last_declaration = NULL;
3675 declaration_t *const declaration = allocate_declaration_zero();
3676 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3677 declaration->source_position = token.source_position;
3678 declaration->symbol = token.v.symbol;
3681 if (last_declaration != NULL) {
3682 last_declaration->next = declaration;
3684 declarations = declaration;
3686 last_declaration = declaration;
3688 if (token.type != ',') {
3692 } while (token.type == T_IDENTIFIER);
3694 *last = last_declaration;
3695 return declarations;
3698 static type_t *automatic_type_conversion(type_t *orig_type);
3700 static void semantic_parameter(declaration_t *declaration)
3702 /* TODO: improve error messages */
3703 source_position_t const* const pos = &declaration->source_position;
3705 switch (declaration->declared_storage_class) {
3706 case STORAGE_CLASS_TYPEDEF:
3707 errorf(pos, "typedef not allowed in parameter list");
3710 /* Allowed storage classes */
3711 case STORAGE_CLASS_NONE:
3712 case STORAGE_CLASS_REGISTER:
3716 errorf(pos, "parameter may only have none or register storage class");
3720 type_t *const orig_type = declaration->type;
3721 /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3722 * sugar. Turn it into a pointer.
3723 * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3724 * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3726 type_t *const type = automatic_type_conversion(orig_type);
3727 declaration->type = type;
3729 if (is_type_incomplete(skip_typeref(type))) {
3730 errorf(pos, "parameter '%#T' is of incomplete type",
3731 orig_type, declaration->symbol);
3735 static declaration_t *parse_parameter(void)
3737 declaration_specifiers_t specifiers;
3738 memset(&specifiers, 0, sizeof(specifiers));
3740 parse_declaration_specifiers(&specifiers);
3742 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3748 * Parses a function type parameter list and return a list of declarations.
3750 * @param last point to the last element of the list
3751 * @return the parameter list
3753 static declaration_t *parse_parameters(function_type_t *type, declaration_t **last)
3755 declaration_t *declarations = NULL;
3758 add_anchor_token(')');
3759 int saved_comma_state = save_and_reset_anchor_state(',');
3761 if (token.type == T_IDENTIFIER &&
3762 !is_typedef_symbol(token.v.symbol)) {
3763 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3764 if (la1_type == ',' || la1_type == ')') {
3765 type->kr_style_parameters = true;
3766 declarations = parse_identifier_list(last);
3767 goto parameters_finished;
3771 if (token.type == ')') {
3772 type->unspecified_parameters = 1;
3773 goto parameters_finished;
3776 declaration_t *declaration;
3777 declaration_t *last_declaration = NULL;
3778 function_parameter_t *parameter;
3779 function_parameter_t *last_parameter = NULL;
3782 switch(token.type) {
3786 goto parameters_finished;
3789 case T___extension__:
3791 declaration = parse_parameter();
3793 /* func(void) is not a parameter */
3794 if (last_parameter == NULL
3795 && token.type == ')'
3796 && declaration->symbol == NULL
3797 && skip_typeref(declaration->type) == type_void) {
3798 goto parameters_finished;
3800 semantic_parameter(declaration);
3802 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3803 memset(parameter, 0, sizeof(parameter[0]));
3804 parameter->type = declaration->type;
3806 if (last_parameter != NULL) {
3807 last_declaration->next = declaration;
3808 last_parameter->next = parameter;
3810 type->parameters = parameter;
3811 declarations = declaration;
3813 last_parameter = parameter;
3814 last_declaration = declaration;
3818 goto parameters_finished;
3820 if (token.type != ',') {
3821 goto parameters_finished;
3827 parameters_finished:
3828 rem_anchor_token(')');
3831 restore_anchor_state(',', saved_comma_state);
3832 *last = last_declaration;
3833 return declarations;
3836 restore_anchor_state(',', saved_comma_state);
3841 typedef enum construct_type_kind_t {
3846 } construct_type_kind_t;
3848 typedef struct construct_type_t construct_type_t;
3849 struct construct_type_t {
3850 construct_type_kind_t kind;
3851 construct_type_t *next;
3854 typedef struct parsed_pointer_t parsed_pointer_t;
3855 struct parsed_pointer_t {
3856 construct_type_t construct_type;
3857 type_qualifiers_t type_qualifiers;
3860 typedef struct construct_function_type_t construct_function_type_t;
3861 struct construct_function_type_t {
3862 construct_type_t construct_type;
3863 type_t *function_type;
3866 typedef struct parsed_array_t parsed_array_t;
3867 struct parsed_array_t {
3868 construct_type_t construct_type;
3869 type_qualifiers_t type_qualifiers;
3875 typedef struct construct_base_type_t construct_base_type_t;
3876 struct construct_base_type_t {
3877 construct_type_t construct_type;
3881 static construct_type_t *parse_pointer_declarator(void)
3885 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3886 memset(pointer, 0, sizeof(pointer[0]));
3887 pointer->construct_type.kind = CONSTRUCT_POINTER;
3888 pointer->type_qualifiers = parse_type_qualifiers();
3890 return (construct_type_t*) pointer;
3893 static construct_type_t *parse_array_declarator(void)
3896 add_anchor_token(']');
3898 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3899 memset(array, 0, sizeof(array[0]));
3900 array->construct_type.kind = CONSTRUCT_ARRAY;
3902 if (token.type == T_static) {
3903 array->is_static = true;
3907 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3908 if (type_qualifiers != 0) {
3909 if (token.type == T_static) {
3910 array->is_static = true;
3914 array->type_qualifiers = type_qualifiers;
3916 if (token.type == '*' && look_ahead(1)->type == ']') {
3917 array->is_variable = true;
3919 } else if (token.type != ']') {
3920 array->size = parse_assignment_expression();
3923 rem_anchor_token(']');
3927 return (construct_type_t*) array;
3930 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3933 if (declaration != NULL) {
3934 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3936 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3938 if (mask & (mask-1)) {
3939 const char *first = NULL, *second = NULL;
3941 /* more than one calling convention set */
3942 if (declaration->modifiers & DM_CDECL) {
3943 if (first == NULL) first = "cdecl";
3944 else if (second == NULL) second = "cdecl";
3946 if (declaration->modifiers & DM_STDCALL) {
3947 if (first == NULL) first = "stdcall";
3948 else if (second == NULL) second = "stdcall";
3950 if (declaration->modifiers & DM_FASTCALL) {
3951 if (first == NULL) first = "fastcall";
3952 else if (second == NULL) second = "fastcall";
3954 if (declaration->modifiers & DM_THISCALL) {
3955 if (first == NULL) first = "thiscall";
3956 else if (second == NULL) second = "thiscall";
3958 errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3961 if (declaration->modifiers & DM_CDECL)
3962 type->function.calling_convention = CC_CDECL;
3963 else if (declaration->modifiers & DM_STDCALL)
3964 type->function.calling_convention = CC_STDCALL;
3965 else if (declaration->modifiers & DM_FASTCALL)
3966 type->function.calling_convention = CC_FASTCALL;
3967 else if (declaration->modifiers & DM_THISCALL)
3968 type->function.calling_convention = CC_THISCALL;
3970 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3973 declaration_t *last;
3974 declaration_t *parameters = parse_parameters(&type->function, &last);
3975 if (declaration != NULL) {
3976 declaration->scope.declarations = parameters;
3977 declaration->scope.last_declaration = last;
3978 declaration->scope.is_parameter = true;
3981 construct_function_type_t *construct_function_type =
3982 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3983 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3984 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3985 construct_function_type->function_type = type;
3987 return &construct_function_type->construct_type;
3990 static void fix_declaration_type(declaration_t *declaration)
3992 decl_modifiers_t declaration_modifiers = declaration->modifiers;
3993 type_modifiers_t type_modifiers = declaration->type->base.modifiers;
3995 if (declaration_modifiers & DM_TRANSPARENT_UNION)
3996 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3998 if (declaration->type->base.modifiers == type_modifiers)
4001 type_t *copy = duplicate_type(declaration->type);
4002 copy->base.modifiers = type_modifiers;
4004 type_t *result = typehash_insert(copy);
4005 if (result != copy) {
4006 obstack_free(type_obst, copy);
4009 declaration->type = result;
4012 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
4013 bool may_be_abstract)
4015 /* construct a single linked list of construct_type_t's which describe
4016 * how to construct the final declarator type */
4017 construct_type_t *first = NULL;
4018 construct_type_t *last = NULL;
4019 gnu_attribute_t *attributes = NULL;
4021 decl_modifiers_t modifiers = parse_attributes(&attributes);
4024 while (token.type == '*') {
4025 construct_type_t *type = parse_pointer_declarator();
4035 /* TODO: find out if this is correct */
4036 modifiers |= parse_attributes(&attributes);
4039 if (declaration != NULL)
4040 declaration->modifiers |= modifiers;
4042 construct_type_t *inner_types = NULL;
4044 switch(token.type) {
4046 if (declaration == NULL) {
4047 errorf(HERE, "no identifier expected in typename");
4049 declaration->symbol = token.v.symbol;
4050 declaration->source_position = token.source_position;
4056 add_anchor_token(')');
4057 inner_types = parse_inner_declarator(declaration, may_be_abstract);
4058 if (inner_types != NULL) {
4059 /* All later declarators only modify the return type, not declaration */
4062 rem_anchor_token(')');
4066 if (may_be_abstract)
4068 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4073 construct_type_t *p = last;
4076 construct_type_t *type;
4077 switch(token.type) {
4079 type = parse_function_declarator(declaration);
4082 type = parse_array_declarator();
4085 goto declarator_finished;
4088 /* insert in the middle of the list (behind p) */
4090 type->next = p->next;
4101 declarator_finished:
4102 /* append inner_types at the end of the list, we don't to set last anymore
4103 * as it's not needed anymore */
4105 assert(first == NULL);
4106 first = inner_types;
4108 last->next = inner_types;
4116 static void parse_declaration_attributes(declaration_t *declaration)
4118 gnu_attribute_t *attributes = NULL;
4119 decl_modifiers_t modifiers = parse_attributes(&attributes);
4121 if (declaration == NULL)
4124 declaration->modifiers |= modifiers;
4125 /* check if we have these stupid mode attributes... */
4126 type_t *old_type = declaration->type;
4127 if (old_type == NULL)
4130 gnu_attribute_t *attribute = attributes;
4131 for ( ; attribute != NULL; attribute = attribute->next) {
4132 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4135 atomic_type_kind_t akind = attribute->u.akind;
4136 if (!is_type_signed(old_type)) {
4138 case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4139 case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4140 case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4141 case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4143 panic("invalid akind in mode attribute");
4147 = make_atomic_type(akind, old_type->base.qualifiers);
4151 static type_t *construct_declarator_type(construct_type_t *construct_list,
4154 construct_type_t *iter = construct_list;
4155 for( ; iter != NULL; iter = iter->next) {
4156 switch(iter->kind) {
4157 case CONSTRUCT_INVALID:
4158 internal_errorf(HERE, "invalid type construction found");
4159 case CONSTRUCT_FUNCTION: {
4160 construct_function_type_t *construct_function_type
4161 = (construct_function_type_t*) iter;
4163 type_t *function_type = construct_function_type->function_type;
4165 function_type->function.return_type = type;
4167 type_t *skipped_return_type = skip_typeref(type);
4169 if (is_type_function(skipped_return_type)) {
4170 errorf(HERE, "function returning function is not allowed");
4171 } else if (is_type_array(skipped_return_type)) {
4172 errorf(HERE, "function returning array is not allowed");
4174 if (skipped_return_type->base.qualifiers != 0) {
4176 "type qualifiers in return type of function type are meaningless");
4180 type = function_type;
4184 case CONSTRUCT_POINTER: {
4185 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4186 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
4187 pointer_type->pointer.points_to = type;
4188 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
4190 type = pointer_type;
4194 case CONSTRUCT_ARRAY: {
4195 parsed_array_t *parsed_array = (parsed_array_t*) iter;
4196 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
4198 expression_t *size_expression = parsed_array->size;
4199 if (size_expression != NULL) {
4201 = create_implicit_cast(size_expression, type_size_t);
4204 array_type->base.qualifiers = parsed_array->type_qualifiers;
4205 array_type->array.element_type = type;
4206 array_type->array.is_static = parsed_array->is_static;
4207 array_type->array.is_variable = parsed_array->is_variable;
4208 array_type->array.size_expression = size_expression;
4210 if (size_expression != NULL) {
4211 if (is_constant_expression(size_expression)) {
4212 array_type->array.size_constant = true;
4213 array_type->array.size
4214 = fold_constant(size_expression);
4216 array_type->array.is_vla = true;
4220 type_t *skipped_type = skip_typeref(type);
4222 if (is_type_incomplete(skipped_type)) {
4223 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4224 } else if (is_type_function(skipped_type)) {
4225 errorf(HERE, "array of functions is not allowed");
4232 type_t *hashed_type = typehash_insert(type);
4233 if (hashed_type != type) {
4234 /* the function type was constructed earlier freeing it here will
4235 * destroy other types... */
4236 if (iter->kind != CONSTRUCT_FUNCTION) {
4246 static declaration_t *parse_declarator(
4247 const declaration_specifiers_t *specifiers, bool may_be_abstract)
4249 declaration_t *const declaration = allocate_declaration_zero();
4250 declaration->source_position = specifiers->source_position;
4251 declaration->declared_storage_class = specifiers->declared_storage_class;
4252 declaration->modifiers = specifiers->modifiers;
4253 declaration->deprecated_string = specifiers->deprecated_string;
4254 declaration->get_property_sym = specifiers->get_property_sym;
4255 declaration->put_property_sym = specifiers->put_property_sym;
4256 declaration->is_inline = specifiers->is_inline;
4258 declaration->storage_class = specifiers->declared_storage_class;
4259 if (declaration->storage_class == STORAGE_CLASS_NONE &&
4260 scope != file_scope) {
4261 declaration->storage_class = STORAGE_CLASS_AUTO;
4264 if (specifiers->alignment != 0) {
4265 /* TODO: add checks here */
4266 declaration->alignment = specifiers->alignment;
4269 construct_type_t *construct_type
4270 = parse_inner_declarator(declaration, may_be_abstract);
4271 type_t *const type = specifiers->type;
4272 declaration->type = construct_declarator_type(construct_type, type);
4274 parse_declaration_attributes(declaration);
4276 fix_declaration_type(declaration);
4278 if (construct_type != NULL) {
4279 obstack_free(&temp_obst, construct_type);
4285 static type_t *parse_abstract_declarator(type_t *base_type)
4287 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4289 type_t *result = construct_declarator_type(construct_type, base_type);
4290 if (construct_type != NULL) {
4291 obstack_free(&temp_obst, construct_type);
4297 static declaration_t *append_declaration(declaration_t* const declaration)
4299 if (last_declaration != NULL) {
4300 last_declaration->next = declaration;
4302 scope->declarations = declaration;
4304 last_declaration = declaration;
4309 * Check if the declaration of main is suspicious. main should be a
4310 * function with external linkage, returning int, taking either zero
4311 * arguments, two, or three arguments of appropriate types, ie.
4313 * int main([ int argc, char **argv [, char **env ] ]).
4315 * @param decl the declaration to check
4316 * @param type the function type of the declaration
4318 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4320 if (decl->storage_class == STORAGE_CLASS_STATIC) {
4321 warningf(&decl->source_position,
4322 "'main' is normally a non-static function");
4324 if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4325 warningf(&decl->source_position,
4326 "return type of 'main' should be 'int', but is '%T'",
4327 func_type->return_type);
4329 const function_parameter_t *parm = func_type->parameters;
4331 type_t *const first_type = parm->type;
4332 if (!types_compatible(skip_typeref(first_type), type_int)) {
4333 warningf(&decl->source_position,
4334 "first argument of 'main' should be 'int', but is '%T'", first_type);
4338 type_t *const second_type = parm->type;
4339 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4340 warningf(&decl->source_position,
4341 "second argument of 'main' should be 'char**', but is '%T'", second_type);
4345 type_t *const third_type = parm->type;
4346 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4347 warningf(&decl->source_position,
4348 "third argument of 'main' should be 'char**', but is '%T'", third_type);
4352 goto warn_arg_count;
4356 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4362 * Check if a symbol is the equal to "main".
4364 static bool is_sym_main(const symbol_t *const sym)
4366 return strcmp(sym->string, "main") == 0;
4369 static declaration_t *record_declaration(
4370 declaration_t *const declaration,
4371 const bool is_definition)
4373 const symbol_t *const symbol = declaration->symbol;
4374 const namespace_t namespc = (namespace_t)declaration->namespc;
4376 assert(symbol != NULL);
4377 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4379 type_t *const orig_type = declaration->type;
4380 type_t *const type = skip_typeref(orig_type);
4381 if (is_type_function(type) &&
4382 type->function.unspecified_parameters &&
4383 warning.strict_prototypes &&
4384 previous_declaration == NULL) {
4385 warningf(&declaration->source_position,
4386 "function declaration '%#T' is not a prototype",
4390 if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4391 check_type_of_main(declaration, &type->function);
4394 if (warning.nested_externs &&
4395 declaration->storage_class == STORAGE_CLASS_EXTERN &&
4396 scope != file_scope) {
4397 warningf(&declaration->source_position,
4398 "nested extern declaration of '%#T'", declaration->type, symbol);
4401 assert(declaration != previous_declaration);
4402 if (previous_declaration != NULL &&
4403 previous_declaration->parent_scope->is_parameter &&
4404 scope->depth == previous_declaration->parent_scope->depth + 1) {
4405 errorf(&declaration->source_position,
4406 "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4407 orig_type, symbol, previous_declaration->type, symbol,
4408 &previous_declaration->source_position);
4411 if (previous_declaration != NULL &&
4412 previous_declaration->parent_scope == scope) {
4413 /* can happen for K&R style declarations */
4414 if (previous_declaration->type == NULL) {
4415 previous_declaration->type = declaration->type;
4418 const type_t *prev_type = skip_typeref(previous_declaration->type);
4419 if (!types_compatible(type, prev_type)) {
4420 errorf(&declaration->source_position,
4421 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4422 orig_type, symbol, previous_declaration->type, symbol,
4423 &previous_declaration->source_position);
4425 unsigned old_storage_class = previous_declaration->storage_class;
4426 if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4427 errorf(&declaration->source_position,
4428 "redeclaration of enum entry '%Y' (declared %P)",
4429 symbol, &previous_declaration->source_position);
4430 return previous_declaration;
4433 if (warning.redundant_decls &&
4435 previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4436 !(previous_declaration->modifiers & DM_USED) &&
4437 !previous_declaration->used) {
4438 warningf(&previous_declaration->source_position,
4439 "unnecessary static forward declaration for '%#T'",
4440 previous_declaration->type, symbol);
4443 unsigned new_storage_class = declaration->storage_class;
4445 if (is_type_incomplete(prev_type)) {
4446 previous_declaration->type = type;
4450 /* pretend no storage class means extern for function
4451 * declarations (except if the previous declaration is neither
4452 * none nor extern) */
4453 if (is_type_function(type)) {
4454 if (prev_type->function.unspecified_parameters) {
4455 previous_declaration->type = type;
4459 switch (old_storage_class) {
4460 case STORAGE_CLASS_NONE:
4461 old_storage_class = STORAGE_CLASS_EXTERN;
4464 case STORAGE_CLASS_EXTERN:
4465 if (is_definition) {
4466 if (warning.missing_prototypes &&
4467 prev_type->function.unspecified_parameters &&
4468 !is_sym_main(symbol)) {
4469 warningf(&declaration->source_position,
4470 "no previous prototype for '%#T'",
4473 } else if (new_storage_class == STORAGE_CLASS_NONE) {
4474 new_storage_class = STORAGE_CLASS_EXTERN;
4483 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4484 new_storage_class == STORAGE_CLASS_EXTERN) {
4485 warn_redundant_declaration:
4486 if (!is_definition &&
4487 warning.redundant_decls &&
4488 is_type_valid(prev_type) &&
4489 strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4490 warningf(&declaration->source_position,
4491 "redundant declaration for '%Y' (declared %P)",
4492 symbol, &previous_declaration->source_position);
4494 } else if (current_function == NULL) {
4495 if (old_storage_class != STORAGE_CLASS_STATIC &&
4496 new_storage_class == STORAGE_CLASS_STATIC) {
4497 errorf(&declaration->source_position,
4498 "static declaration of '%Y' follows non-static declaration (declared %P)",
4499 symbol, &previous_declaration->source_position);
4500 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4501 previous_declaration->storage_class = STORAGE_CLASS_NONE;
4502 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4504 goto warn_redundant_declaration;
4506 } else if (is_type_valid(prev_type)) {
4507 if (old_storage_class == new_storage_class) {
4508 errorf(&declaration->source_position,
4509 "redeclaration of '%Y' (declared %P)",
4510 symbol, &previous_declaration->source_position);
4512 errorf(&declaration->source_position,
4513 "redeclaration of '%Y' with different linkage (declared %P)",
4514 symbol, &previous_declaration->source_position);
4519 previous_declaration->modifiers |= declaration->modifiers;
4520 previous_declaration->is_inline |= declaration->is_inline;
4521 return previous_declaration;
4522 } else if (is_type_function(type)) {
4523 if (is_definition &&
4524 declaration->storage_class != STORAGE_CLASS_STATIC) {
4525 if (warning.missing_prototypes && !is_sym_main(symbol)) {
4526 warningf(&declaration->source_position,
4527 "no previous prototype for '%#T'", orig_type, symbol);
4528 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4529 warningf(&declaration->source_position,
4530 "no previous declaration for '%#T'", orig_type,
4535 if (warning.missing_declarations &&
4536 scope == file_scope && (
4537 declaration->storage_class == STORAGE_CLASS_NONE ||
4538 declaration->storage_class == STORAGE_CLASS_THREAD
4540 warningf(&declaration->source_position,
4541 "no previous declaration for '%#T'", orig_type, symbol);
4545 assert(declaration->parent_scope == NULL);
4546 assert(scope != NULL);
4548 declaration->parent_scope = scope;
4550 environment_push(declaration);
4551 return append_declaration(declaration);
4554 static void parser_error_multiple_definition(declaration_t *declaration,
4555 const source_position_t *source_position)
4557 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4558 declaration->symbol, &declaration->source_position);
4561 static bool is_declaration_specifier(const token_t *token,
4562 bool only_specifiers_qualifiers)
4564 switch (token->type) {
4569 return is_typedef_symbol(token->v.symbol);
4571 case T___extension__:
4573 return !only_specifiers_qualifiers;
4580 static void parse_init_declarator_rest(declaration_t *declaration)
4584 type_t *orig_type = declaration->type;
4585 type_t *type = skip_typeref(orig_type);
4587 if (declaration->init.initializer != NULL) {
4588 parser_error_multiple_definition(declaration, HERE);
4591 bool must_be_constant = false;
4592 if (declaration->storage_class == STORAGE_CLASS_STATIC ||
4593 declaration->storage_class == STORAGE_CLASS_THREAD_STATIC ||
4594 declaration->parent_scope == file_scope) {
4595 must_be_constant = true;
4598 if (is_type_function(type)) {
4599 errorf(&declaration->source_position,
4600 "function '%#T' is initialized like a variable",
4601 orig_type, declaration->symbol);
4602 orig_type = type_error_type;
4605 parse_initializer_env_t env;
4606 env.type = orig_type;
4607 env.must_be_constant = must_be_constant;
4608 env.declaration = current_init_decl = declaration;
4610 initializer_t *initializer = parse_initializer(&env);
4611 current_init_decl = NULL;
4613 if (!is_type_function(type)) {
4614 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
4615 * the array type size */
4616 declaration->type = env.type;
4617 declaration->init.initializer = initializer;
4621 /* parse rest of a declaration without any declarator */
4622 static void parse_anonymous_declaration_rest(
4623 const declaration_specifiers_t *specifiers)
4627 if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) {
4628 warningf(&specifiers->source_position,
4629 "useless storage class in empty declaration");
4632 type_t *type = specifiers->type;
4633 switch (type->kind) {
4634 case TYPE_COMPOUND_STRUCT:
4635 case TYPE_COMPOUND_UNION: {
4636 if (type->compound.declaration->symbol == NULL) {
4637 warningf(&specifiers->source_position,
4638 "unnamed struct/union that defines no instances");
4647 warningf(&specifiers->source_position, "empty declaration");
4651 #ifdef RECORD_EMPTY_DECLARATIONS
4652 declaration_t *const declaration = allocate_declaration_zero();
4653 declaration->type = specifiers->type;
4654 declaration->declared_storage_class = specifiers->declared_storage_class;
4655 declaration->source_position = specifiers->source_position;
4656 declaration->modifiers = specifiers->modifiers;
4657 declaration->storage_class = STORAGE_CLASS_NONE;
4659 append_declaration(declaration);
4663 static void parse_declaration_rest(declaration_t *ndeclaration,
4664 const declaration_specifiers_t *specifiers,
4665 parsed_declaration_func finished_declaration)
4667 add_anchor_token(';');
4668 add_anchor_token(',');
4670 declaration_t *declaration =
4671 finished_declaration(ndeclaration, token.type == '=');
4673 type_t *orig_type = declaration->type;
4674 type_t *type = skip_typeref(orig_type);
4676 if (type->kind != TYPE_FUNCTION &&
4677 declaration->is_inline &&
4678 is_type_valid(type)) {
4679 warningf(&declaration->source_position,
4680 "variable '%Y' declared 'inline'\n", declaration->symbol);
4683 if (token.type == '=') {
4684 parse_init_declarator_rest(declaration);
4687 if (token.type != ',')
4691 add_anchor_token('=');
4692 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4693 rem_anchor_token('=');
4698 rem_anchor_token(';');
4699 rem_anchor_token(',');
4702 static declaration_t *finished_kr_declaration(declaration_t *declaration, bool is_definition)
4704 symbol_t *symbol = declaration->symbol;
4705 if (symbol == NULL) {
4706 errorf(HERE, "anonymous declaration not valid as function parameter");
4709 namespace_t namespc = (namespace_t) declaration->namespc;
4710 if (namespc != NAMESPACE_NORMAL) {
4711 return record_declaration(declaration, false);
4714 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4715 if (previous_declaration == NULL ||
4716 previous_declaration->parent_scope != scope) {
4717 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4722 if (is_definition) {
4723 errorf(HERE, "parameter %Y is initialised", declaration->symbol);
4726 if (previous_declaration->type == NULL) {
4727 previous_declaration->type = declaration->type;
4728 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4729 previous_declaration->storage_class = declaration->storage_class;
4730 previous_declaration->parent_scope = scope;
4731 return previous_declaration;
4733 return record_declaration(declaration, false);
4737 static void parse_declaration(parsed_declaration_func finished_declaration)
4739 declaration_specifiers_t specifiers;
4740 memset(&specifiers, 0, sizeof(specifiers));
4742 add_anchor_token(';');
4743 parse_declaration_specifiers(&specifiers);
4744 rem_anchor_token(';');
4746 if (token.type == ';') {
4747 parse_anonymous_declaration_rest(&specifiers);
4749 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4750 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4754 static type_t *get_default_promoted_type(type_t *orig_type)
4756 type_t *result = orig_type;
4758 type_t *type = skip_typeref(orig_type);
4759 if (is_type_integer(type)) {
4760 result = promote_integer(type);
4761 } else if (type == type_float) {
4762 result = type_double;
4768 static void parse_kr_declaration_list(declaration_t *declaration)
4770 type_t *type = skip_typeref(declaration->type);
4771 if (!is_type_function(type))
4774 if (!type->function.kr_style_parameters)
4777 add_anchor_token('{');
4779 /* push function parameters */
4780 size_t const top = environment_top();
4781 scope_push(&declaration->scope);
4783 declaration_t *parameter = declaration->scope.declarations;
4784 for ( ; parameter != NULL; parameter = parameter->next) {
4785 assert(parameter->parent_scope == NULL);
4786 parameter->parent_scope = scope;
4787 environment_push(parameter);
4790 /* parse declaration list */
4791 while (is_declaration_specifier(&token, false)) {
4792 parse_declaration(finished_kr_declaration);
4795 /* pop function parameters */
4796 assert(scope == &declaration->scope);
4798 environment_pop_to(top);
4800 /* update function type */
4801 type_t *new_type = duplicate_type(type);
4803 function_parameter_t *parameters = NULL;
4804 function_parameter_t *last_parameter = NULL;
4806 declaration_t *parameter_declaration = declaration->scope.declarations;
4807 for( ; parameter_declaration != NULL;
4808 parameter_declaration = parameter_declaration->next) {
4809 type_t *parameter_type = parameter_declaration->type;
4810 if (parameter_type == NULL) {
4812 errorf(HERE, "no type specified for function parameter '%Y'",
4813 parameter_declaration->symbol);
4815 if (warning.implicit_int) {
4816 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4817 parameter_declaration->symbol);
4819 parameter_type = type_int;
4820 parameter_declaration->type = parameter_type;
4824 semantic_parameter(parameter_declaration);
4825 parameter_type = parameter_declaration->type;
4828 * we need the default promoted types for the function type
4830 parameter_type = get_default_promoted_type(parameter_type);
4832 function_parameter_t *function_parameter
4833 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4834 memset(function_parameter, 0, sizeof(function_parameter[0]));
4836 function_parameter->type = parameter_type;
4837 if (last_parameter != NULL) {
4838 last_parameter->next = function_parameter;
4840 parameters = function_parameter;
4842 last_parameter = function_parameter;
4845 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4847 new_type->function.parameters = parameters;
4848 new_type->function.unspecified_parameters = true;
4850 type = typehash_insert(new_type);
4851 if (type != new_type) {
4852 obstack_free(type_obst, new_type);
4855 declaration->type = type;
4857 rem_anchor_token('{');
4860 static bool first_err = true;
4863 * When called with first_err set, prints the name of the current function,
4866 static void print_in_function(void)
4870 diagnosticf("%s: In function '%Y':\n",
4871 current_function->source_position.input_name,
4872 current_function->symbol);
4877 * Check if all labels are defined in the current function.
4878 * Check if all labels are used in the current function.
4880 static void check_labels(void)
4882 for (const goto_statement_t *goto_statement = goto_first;
4883 goto_statement != NULL;
4884 goto_statement = goto_statement->next) {
4885 /* skip computed gotos */
4886 if (goto_statement->expression != NULL)
4889 declaration_t *label = goto_statement->label;
4892 if (label->source_position.input_name == NULL) {
4893 print_in_function();
4894 errorf(&goto_statement->base.source_position,
4895 "label '%Y' used but not defined", label->symbol);
4898 goto_first = goto_last = NULL;
4900 if (warning.unused_label) {
4901 for (const label_statement_t *label_statement = label_first;
4902 label_statement != NULL;
4903 label_statement = label_statement->next) {
4904 const declaration_t *label = label_statement->label;
4906 if (! label->used) {
4907 print_in_function();
4908 warningf(&label_statement->base.source_position,
4909 "label '%Y' defined but not used", label->symbol);
4913 label_first = label_last = NULL;
4917 * Check declarations of current_function for unused entities.
4919 static void check_declarations(void)
4921 if (warning.unused_parameter) {
4922 const scope_t *scope = ¤t_function->scope;
4924 if (is_sym_main(current_function->symbol)) {
4925 /* do not issue unused warnings for main */
4928 const declaration_t *parameter = scope->declarations;
4929 for (; parameter != NULL; parameter = parameter->next) {
4930 if (! parameter->used) {
4931 print_in_function();
4932 warningf(¶meter->source_position,
4933 "unused parameter '%Y'", parameter->symbol);
4937 if (warning.unused_variable) {
4941 static int determine_truth(expression_t const* const cond)
4944 !is_constant_expression(cond) ? 0 :
4945 fold_constant(cond) != 0 ? 1 :
4949 static bool noreturn_candidate;
4951 static void check_reachable(statement_t *const stmt)
4953 if (stmt->base.reachable)
4955 if (stmt->kind != STATEMENT_DO_WHILE)
4956 stmt->base.reachable = true;
4958 statement_t *last = stmt;
4960 switch (stmt->kind) {
4961 case STATEMENT_INVALID:
4962 case STATEMENT_EMPTY:
4963 case STATEMENT_DECLARATION:
4965 next = stmt->base.next;
4968 case STATEMENT_COMPOUND:
4969 next = stmt->compound.statements;
4972 case STATEMENT_RETURN:
4973 noreturn_candidate = false;
4976 case STATEMENT_IF: {
4977 if_statement_t const* const ifs = &stmt->ifs;
4978 int const val = determine_truth(ifs->condition);
4981 check_reachable(ifs->true_statement);
4986 if (ifs->false_statement != NULL) {
4987 check_reachable(ifs->false_statement);
4991 next = stmt->base.next;
4995 case STATEMENT_SWITCH: {
4996 switch_statement_t const *const switchs = &stmt->switchs;
4997 expression_t const *const expr = switchs->expression;
4999 if (is_constant_expression(expr)) {
5000 long const val = fold_constant(expr);
5001 case_label_statement_t * defaults = NULL;
5002 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5003 if (i->expression == NULL) {
5008 if (i->first_case <= val && val <= i->last_case) {
5009 check_reachable((statement_t*)i);
5014 if (defaults != NULL) {
5015 check_reachable((statement_t*)defaults);
5019 bool has_default = false;
5020 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5021 if (i->expression == NULL)
5024 check_reachable((statement_t*)i);
5031 next = stmt->base.next;
5035 case STATEMENT_EXPRESSION: {
5036 /* Check for noreturn function call */
5037 expression_t const *const expr = stmt->expression.expression;
5038 if (expr->kind == EXPR_CALL) {
5039 expression_t const *const func = expr->call.function;
5040 if (func->kind == EXPR_REFERENCE) {
5041 declaration_t const *const decl = func->reference.declaration;
5042 if (decl != NULL && decl->modifiers & DM_NORETURN) {
5048 next = stmt->base.next;
5052 case STATEMENT_CONTINUE: {
5053 statement_t *parent = stmt;
5055 parent = parent->base.parent;
5056 if (parent == NULL) /* continue not within loop */
5060 switch (parent->kind) {
5061 case STATEMENT_WHILE: goto continue_while;
5062 case STATEMENT_DO_WHILE: goto continue_do_while;
5063 case STATEMENT_FOR: goto continue_for;
5070 case STATEMENT_BREAK: {
5071 statement_t *parent = stmt;
5073 parent = parent->base.parent;
5074 if (parent == NULL) /* break not within loop/switch */
5077 switch (parent->kind) {
5078 case STATEMENT_SWITCH:
5079 case STATEMENT_WHILE:
5080 case STATEMENT_DO_WHILE:
5083 next = parent->base.next;
5084 goto found_break_parent;
5093 case STATEMENT_GOTO:
5094 if (stmt->gotos.expression) {
5095 statement_t *parent = stmt->base.parent;
5096 if (parent == NULL) /* top level goto */
5100 next = stmt->gotos.label->init.statement;
5101 if (next == NULL) /* missing label */
5106 case STATEMENT_LABEL:
5107 next = stmt->label.statement;
5110 case STATEMENT_CASE_LABEL:
5111 next = stmt->case_label.statement;
5114 case STATEMENT_WHILE: {
5115 while_statement_t const *const whiles = &stmt->whiles;
5116 int const val = determine_truth(whiles->condition);
5119 check_reachable(whiles->body);
5124 next = stmt->base.next;
5128 case STATEMENT_DO_WHILE:
5129 next = stmt->do_while.body;
5132 case STATEMENT_FOR: {
5133 for_statement_t *const fors = &stmt->fors;
5135 if (fors->condition_reachable)
5137 fors->condition_reachable = true;
5139 expression_t const *const cond = fors->condition;
5141 cond == NULL ? 1 : determine_truth(cond);
5144 check_reachable(fors->body);
5149 next = stmt->base.next;
5153 case STATEMENT_MS_TRY: {
5154 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5155 check_reachable(ms_try->try_statement);
5156 next = ms_try->final_statement;
5160 case STATEMENT_LEAVE: {
5161 statement_t *parent = stmt;
5163 parent = parent->base.parent;
5164 if (parent == NULL) /* __leave not within __try */
5167 if (parent->kind == STATEMENT_MS_TRY) {
5169 next = parent->ms_try.final_statement;
5177 while (next == NULL) {
5178 next = last->base.parent;
5180 noreturn_candidate = false;
5182 type_t *const type = current_function->type;
5183 assert(is_type_function(type));
5184 type_t *const ret = skip_typeref(type->function.return_type);
5185 if (warning.return_type &&
5186 !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5187 is_type_valid(ret) &&
5188 !is_sym_main(current_function->symbol)) {
5189 warningf(&stmt->base.source_position,
5190 "control reaches end of non-void function");
5195 switch (next->kind) {
5196 case STATEMENT_INVALID:
5197 case STATEMENT_EMPTY:
5198 case STATEMENT_DECLARATION:
5199 case STATEMENT_EXPRESSION:
5201 case STATEMENT_RETURN:
5202 case STATEMENT_CONTINUE:
5203 case STATEMENT_BREAK:
5204 case STATEMENT_GOTO:
5205 case STATEMENT_LEAVE:
5206 panic("invalid control flow in function");
5208 case STATEMENT_COMPOUND:
5210 case STATEMENT_SWITCH:
5211 case STATEMENT_LABEL:
5212 case STATEMENT_CASE_LABEL:
5214 next = next->base.next;
5217 case STATEMENT_WHILE: {
5219 if (next->base.reachable)
5221 next->base.reachable = true;
5223 while_statement_t const *const whiles = &next->whiles;
5224 int const val = determine_truth(whiles->condition);
5227 check_reachable(whiles->body);
5233 next = next->base.next;
5237 case STATEMENT_DO_WHILE: {
5239 if (next->base.reachable)
5241 next->base.reachable = true;
5243 do_while_statement_t const *const dw = &next->do_while;
5244 int const val = determine_truth(dw->condition);
5247 check_reachable(dw->body);
5253 next = next->base.next;
5257 case STATEMENT_FOR: {
5259 for_statement_t *const fors = &next->fors;
5261 fors->step_reachable = true;
5263 if (fors->condition_reachable)
5265 fors->condition_reachable = true;
5267 expression_t const *const cond = fors->condition;
5269 cond == NULL ? 1 : determine_truth(cond);
5272 check_reachable(fors->body);
5278 next = next->base.next;
5282 case STATEMENT_MS_TRY:
5284 next = next->ms_try.final_statement;
5290 next = stmt->base.parent;
5292 warningf(&stmt->base.source_position,
5293 "control reaches end of non-void function");
5297 check_reachable(next);
5300 static void check_unreachable(statement_t const* const stmt)
5302 if (!stmt->base.reachable &&
5303 stmt->kind != STATEMENT_DO_WHILE &&
5304 stmt->kind != STATEMENT_FOR &&
5305 (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) {
5306 warningf(&stmt->base.source_position, "statement is unreachable");
5309 switch (stmt->kind) {
5310 case STATEMENT_INVALID:
5311 case STATEMENT_EMPTY:
5312 case STATEMENT_RETURN:
5313 case STATEMENT_DECLARATION:
5314 case STATEMENT_EXPRESSION:
5315 case STATEMENT_CONTINUE:
5316 case STATEMENT_BREAK:
5317 case STATEMENT_GOTO:
5319 case STATEMENT_LEAVE:
5322 case STATEMENT_COMPOUND:
5323 if (stmt->compound.statements)
5324 check_unreachable(stmt->compound.statements);
5328 check_unreachable(stmt->ifs.true_statement);
5329 if (stmt->ifs.false_statement != NULL)
5330 check_unreachable(stmt->ifs.false_statement);
5333 case STATEMENT_SWITCH:
5334 check_unreachable(stmt->switchs.body);
5337 case STATEMENT_LABEL:
5338 check_unreachable(stmt->label.statement);
5341 case STATEMENT_CASE_LABEL:
5342 check_unreachable(stmt->case_label.statement);
5345 case STATEMENT_WHILE:
5346 check_unreachable(stmt->whiles.body);
5349 case STATEMENT_DO_WHILE:
5350 check_unreachable(stmt->do_while.body);
5351 if (!stmt->base.reachable) {
5352 expression_t const *const cond = stmt->do_while.condition;
5353 if (determine_truth(cond) >= 0) {
5354 warningf(&cond->base.source_position,
5355 "condition of do-while-loop is unreachable");
5360 case STATEMENT_FOR: {
5361 for_statement_t const* const fors = &stmt->fors;
5363 // if init and step are unreachable, cond is unreachable, too
5364 if (!stmt->base.reachable && !fors->step_reachable) {
5365 warningf(&stmt->base.source_position, "statement is unreachable");
5367 if (!stmt->base.reachable && fors->initialisation != NULL) {
5368 warningf(&fors->initialisation->base.source_position,
5369 "initialisation of for-statement is unreachable");
5372 if (!fors->condition_reachable && fors->condition != NULL) {
5373 warningf(&fors->condition->base.source_position,
5374 "condition of for-statement is unreachable");
5377 if (!fors->step_reachable && fors->step != NULL) {
5378 warningf(&fors->step->base.source_position,
5379 "step of for-statement is unreachable");
5383 check_unreachable(fors->body);
5387 case STATEMENT_MS_TRY: {
5388 ms_try_statement_t const *const ms_try = &stmt->ms_try;
5389 check_unreachable(ms_try->try_statement);
5390 check_unreachable(ms_try->final_statement);
5394 if (stmt->base.next)
5395 check_unreachable(stmt->base.next);
5398 static void parse_external_declaration(void)
5400 /* function-definitions and declarations both start with declaration
5402 declaration_specifiers_t specifiers;
5403 memset(&specifiers, 0, sizeof(specifiers));
5405 add_anchor_token(';');
5406 parse_declaration_specifiers(&specifiers);
5407 rem_anchor_token(';');
5409 /* must be a declaration */
5410 if (token.type == ';') {
5411 parse_anonymous_declaration_rest(&specifiers);
5415 add_anchor_token(',');
5416 add_anchor_token('=');
5417 add_anchor_token(';');
5418 add_anchor_token('{');
5420 /* declarator is common to both function-definitions and declarations */
5421 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
5423 rem_anchor_token('{');
5424 rem_anchor_token(';');
5425 rem_anchor_token('=');
5426 rem_anchor_token(',');
5428 /* must be a declaration */
5429 switch (token.type) {
5433 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
5437 /* must be a function definition */
5438 parse_kr_declaration_list(ndeclaration);
5440 if (token.type != '{') {
5441 parse_error_expected("while parsing function definition", '{', NULL);
5442 eat_until_matching_token(';');
5446 type_t *type = ndeclaration->type;
5448 /* note that we don't skip typerefs: the standard doesn't allow them here
5449 * (so we can't use is_type_function here) */
5450 if (type->kind != TYPE_FUNCTION) {
5451 if (is_type_valid(type)) {
5452 errorf(HERE, "declarator '%#T' has a body but is not a function type",
5453 type, ndeclaration->symbol);
5459 if (warning.aggregate_return &&
5460 is_type_compound(skip_typeref(type->function.return_type))) {
5461 warningf(HERE, "function '%Y' returns an aggregate",
5462 ndeclaration->symbol);
5464 if (warning.traditional && !type->function.unspecified_parameters) {
5465 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5466 ndeclaration->symbol);
5468 if (warning.old_style_definition && type->function.unspecified_parameters) {
5469 warningf(HERE, "old-style function definition '%Y'",
5470 ndeclaration->symbol);
5473 /* § 6.7.5.3 (14) a function definition with () means no
5474 * parameters (and not unspecified parameters) */
5475 if (type->function.unspecified_parameters
5476 && type->function.parameters == NULL
5477 && !type->function.kr_style_parameters) {
5478 type_t *duplicate = duplicate_type(type);
5479 duplicate->function.unspecified_parameters = false;
5481 type = typehash_insert(duplicate);
5482 if (type != duplicate) {
5483 obstack_free(type_obst, duplicate);
5485 ndeclaration->type = type;
5488 declaration_t *const declaration = record_declaration(ndeclaration, true);
5489 if (ndeclaration != declaration) {
5490 declaration->scope = ndeclaration->scope;
5492 type = skip_typeref(declaration->type);
5494 /* push function parameters and switch scope */
5495 size_t const top = environment_top();
5496 scope_push(&declaration->scope);
5498 declaration_t *parameter = declaration->scope.declarations;
5499 for( ; parameter != NULL; parameter = parameter->next) {
5500 if (parameter->parent_scope == &ndeclaration->scope) {
5501 parameter->parent_scope = scope;
5503 assert(parameter->parent_scope == NULL
5504 || parameter->parent_scope == scope);
5505 parameter->parent_scope = scope;
5506 if (parameter->symbol == NULL) {
5507 errorf(¶meter->source_position, "parameter name omitted");
5510 environment_push(parameter);
5513 if (declaration->init.statement != NULL) {
5514 parser_error_multiple_definition(declaration, HERE);
5517 /* parse function body */
5518 int label_stack_top = label_top();
5519 declaration_t *old_current_function = current_function;
5520 current_function = declaration;
5521 current_parent = NULL;
5523 statement_t *const body = parse_compound_statement(false);
5524 declaration->init.statement = body;
5527 check_declarations();
5528 if (warning.return_type ||
5529 warning.unreachable_code ||
5530 (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) {
5531 noreturn_candidate = true;
5532 check_reachable(body);
5533 if (warning.unreachable_code)
5534 check_unreachable(body);
5535 if (warning.missing_noreturn &&
5536 noreturn_candidate &&
5537 !(declaration->modifiers & DM_NORETURN)) {
5538 warningf(&body->base.source_position,
5539 "function '%#T' is candidate for attribute 'noreturn'",
5540 type, declaration->symbol);
5544 assert(current_parent == NULL);
5545 assert(current_function == declaration);
5546 current_function = old_current_function;
5547 label_pop_to(label_stack_top);
5550 assert(scope == &declaration->scope);
5552 environment_pop_to(top);
5555 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5556 source_position_t *source_position,
5557 const symbol_t *symbol)
5559 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
5561 type->bitfield.base_type = base_type;
5562 type->bitfield.size_expression = size;
5565 type_t *skipped_type = skip_typeref(base_type);
5566 if (!is_type_integer(skipped_type)) {
5567 errorf(HERE, "bitfield base type '%T' is not an integer type",
5571 bit_size = skipped_type->base.size * 8;
5574 if (is_constant_expression(size)) {
5575 long v = fold_constant(size);
5578 errorf(source_position, "negative width in bit-field '%Y'",
5580 } else if (v == 0) {
5581 errorf(source_position, "zero width for bit-field '%Y'",
5583 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
5584 errorf(source_position, "width of '%Y' exceeds its type",
5587 type->bitfield.bit_size = v;
5594 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
5597 declaration_t *iter = compound_declaration->scope.declarations;
5598 for( ; iter != NULL; iter = iter->next) {
5599 if (iter->namespc != NAMESPACE_NORMAL)
5602 if (iter->symbol == NULL) {
5603 type_t *type = skip_typeref(iter->type);
5604 if (is_type_compound(type)) {
5605 declaration_t *result
5606 = find_compound_entry(type->compound.declaration, symbol);
5613 if (iter->symbol == symbol) {
5621 static void parse_compound_declarators(declaration_t *struct_declaration,
5622 const declaration_specifiers_t *specifiers)
5624 declaration_t *last_declaration = struct_declaration->scope.declarations;
5625 if (last_declaration != NULL) {
5626 while (last_declaration->next != NULL) {
5627 last_declaration = last_declaration->next;
5632 declaration_t *declaration;
5634 if (token.type == ':') {
5635 source_position_t source_position = *HERE;
5638 type_t *base_type = specifiers->type;
5639 expression_t *size = parse_constant_expression();
5641 type_t *type = make_bitfield_type(base_type, size,
5642 &source_position, sym_anonymous);
5644 declaration = allocate_declaration_zero();
5645 declaration->namespc = NAMESPACE_NORMAL;
5646 declaration->declared_storage_class = STORAGE_CLASS_NONE;
5647 declaration->storage_class = STORAGE_CLASS_NONE;
5648 declaration->source_position = source_position;
5649 declaration->modifiers = specifiers->modifiers;
5650 declaration->type = type;
5652 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
5654 type_t *orig_type = declaration->type;
5655 type_t *type = skip_typeref(orig_type);
5657 if (token.type == ':') {
5658 source_position_t source_position = *HERE;
5660 expression_t *size = parse_constant_expression();
5662 type_t *bitfield_type = make_bitfield_type(orig_type, size,
5663 &source_position, declaration->symbol);
5664 declaration->type = bitfield_type;
5666 /* TODO we ignore arrays for now... what is missing is a check
5667 * that they're at the end of the struct */
5668 if (is_type_incomplete(type) && !is_type_array(type)) {
5670 "compound member '%Y' has incomplete type '%T'",
5671 declaration->symbol, orig_type);
5672 } else if (is_type_function(type)) {
5673 errorf(HERE, "compound member '%Y' must not have function type '%T'",
5674 declaration->symbol, orig_type);
5679 /* make sure we don't define a symbol multiple times */
5680 symbol_t *symbol = declaration->symbol;
5681 if (symbol != NULL) {
5682 declaration_t *prev_decl
5683 = find_compound_entry(struct_declaration, symbol);
5685 if (prev_decl != NULL) {
5686 assert(prev_decl->symbol == symbol);
5687 errorf(&declaration->source_position,
5688 "multiple declarations of symbol '%Y' (declared %P)",
5689 symbol, &prev_decl->source_position);
5693 /* append declaration */
5694 if (last_declaration != NULL) {
5695 last_declaration->next = declaration;
5697 struct_declaration->scope.declarations = declaration;
5699 last_declaration = declaration;
5701 if (token.type != ',')
5711 static void parse_compound_type_entries(declaration_t *compound_declaration)
5714 add_anchor_token('}');
5716 while (token.type != '}') {
5717 if (token.type == T_EOF) {
5718 errorf(HERE, "EOF while parsing struct");
5721 declaration_specifiers_t specifiers;
5722 memset(&specifiers, 0, sizeof(specifiers));
5723 parse_declaration_specifiers(&specifiers);
5725 parse_compound_declarators(compound_declaration, &specifiers);
5727 rem_anchor_token('}');
5731 static type_t *parse_typename(void)
5733 declaration_specifiers_t specifiers;
5734 memset(&specifiers, 0, sizeof(specifiers));
5735 parse_declaration_specifiers(&specifiers);
5736 if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
5737 /* TODO: improve error message, user does probably not know what a
5738 * storage class is...
5740 errorf(HERE, "typename may not have a storage class");
5743 type_t *result = parse_abstract_declarator(specifiers.type);
5751 typedef expression_t* (*parse_expression_function) (unsigned precedence);
5752 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
5753 expression_t *left);
5755 typedef struct expression_parser_function_t expression_parser_function_t;
5756 struct expression_parser_function_t {
5757 unsigned precedence;
5758 parse_expression_function parser;
5759 unsigned infix_precedence;
5760 parse_expression_infix_function infix_parser;
5763 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5766 * Prints an error message if an expression was expected but not read
5768 static expression_t *expected_expression_error(void)
5770 /* skip the error message if the error token was read */
5771 if (token.type != T_ERROR) {
5772 errorf(HERE, "expected expression, got token '%K'", &token);
5776 return create_invalid_expression();
5780 * Parse a string constant.
5782 static expression_t *parse_string_const(void)
5785 if (token.type == T_STRING_LITERAL) {
5786 string_t res = token.v.string;
5788 while (token.type == T_STRING_LITERAL) {
5789 res = concat_strings(&res, &token.v.string);
5792 if (token.type != T_WIDE_STRING_LITERAL) {
5793 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
5794 /* note: that we use type_char_ptr here, which is already the
5795 * automatic converted type. revert_automatic_type_conversion
5796 * will construct the array type */
5797 cnst->base.type = warning.write_strings ? type_const_char_ptr : type_char_ptr;
5798 cnst->string.value = res;
5802 wres = concat_string_wide_string(&res, &token.v.wide_string);
5804 wres = token.v.wide_string;
5809 switch (token.type) {
5810 case T_WIDE_STRING_LITERAL:
5811 wres = concat_wide_strings(&wres, &token.v.wide_string);
5814 case T_STRING_LITERAL:
5815 wres = concat_wide_string_string(&wres, &token.v.string);
5819 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5820 cnst->base.type = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5821 cnst->wide_string.value = wres;
5830 * Parse an integer constant.
5832 static expression_t *parse_int_const(void)
5834 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5835 cnst->base.source_position = *HERE;
5836 cnst->base.type = token.datatype;
5837 cnst->conste.v.int_value = token.v.intvalue;
5845 * Parse a character constant.
5847 static expression_t *parse_character_constant(void)
5849 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5851 cnst->base.source_position = *HERE;
5852 cnst->base.type = token.datatype;
5853 cnst->conste.v.character = token.v.string;
5855 if (cnst->conste.v.character.size != 1) {
5856 if (warning.multichar && GNU_MODE) {
5857 warningf(HERE, "multi-character character constant");
5859 errorf(HERE, "more than 1 characters in character constant");
5868 * Parse a wide character constant.
5870 static expression_t *parse_wide_character_constant(void)
5872 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5874 cnst->base.source_position = *HERE;
5875 cnst->base.type = token.datatype;
5876 cnst->conste.v.wide_character = token.v.wide_string;
5878 if (cnst->conste.v.wide_character.size != 1) {
5879 if (warning.multichar && GNU_MODE) {
5880 warningf(HERE, "multi-character character constant");
5882 errorf(HERE, "more than 1 characters in character constant");
5891 * Parse a float constant.
5893 static expression_t *parse_float_const(void)
5895 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5896 cnst->base.type = token.datatype;
5897 cnst->conste.v.float_value = token.v.floatvalue;
5904 static declaration_t *create_implicit_function(symbol_t *symbol,
5905 const source_position_t *source_position)
5907 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
5908 ntype->function.return_type = type_int;
5909 ntype->function.unspecified_parameters = true;
5911 type_t *type = typehash_insert(ntype);
5912 if (type != ntype) {
5916 declaration_t *const declaration = allocate_declaration_zero();
5917 declaration->storage_class = STORAGE_CLASS_EXTERN;
5918 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5919 declaration->type = type;
5920 declaration->symbol = symbol;
5921 declaration->source_position = *source_position;
5922 declaration->implicit = true;
5924 bool strict_prototypes_old = warning.strict_prototypes;
5925 warning.strict_prototypes = false;
5926 record_declaration(declaration, false);
5927 warning.strict_prototypes = strict_prototypes_old;
5933 * Creates a return_type (func)(argument_type) function type if not
5936 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5937 type_t *argument_type2)
5939 function_parameter_t *parameter2
5940 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5941 memset(parameter2, 0, sizeof(parameter2[0]));
5942 parameter2->type = argument_type2;
5944 function_parameter_t *parameter1
5945 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5946 memset(parameter1, 0, sizeof(parameter1[0]));
5947 parameter1->type = argument_type1;
5948 parameter1->next = parameter2;
5950 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5951 type->function.return_type = return_type;
5952 type->function.parameters = parameter1;
5954 type_t *result = typehash_insert(type);
5955 if (result != type) {
5963 * Creates a return_type (func)(argument_type) function type if not
5966 * @param return_type the return type
5967 * @param argument_type the argument type
5969 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5971 function_parameter_t *parameter
5972 = obstack_alloc(type_obst, sizeof(parameter[0]));
5973 memset(parameter, 0, sizeof(parameter[0]));
5974 parameter->type = argument_type;
5976 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5977 type->function.return_type = return_type;
5978 type->function.parameters = parameter;
5980 type_t *result = typehash_insert(type);
5981 if (result != type) {
5988 static type_t *make_function_0_type(type_t *return_type)
5990 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5991 type->function.return_type = return_type;
5992 type->function.parameters = NULL;
5994 type_t *result = typehash_insert(type);
5995 if (result != type) {
6003 * Creates a function type for some function like builtins.
6005 * @param symbol the symbol describing the builtin
6007 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6009 switch(symbol->ID) {
6010 case T___builtin_alloca:
6011 return make_function_1_type(type_void_ptr, type_size_t);
6012 case T___builtin_huge_val:
6013 return make_function_0_type(type_double);
6014 case T___builtin_nan:
6015 return make_function_1_type(type_double, type_char_ptr);
6016 case T___builtin_nanf:
6017 return make_function_1_type(type_float, type_char_ptr);
6018 case T___builtin_nand:
6019 return make_function_1_type(type_long_double, type_char_ptr);
6020 case T___builtin_va_end:
6021 return make_function_1_type(type_void, type_valist);
6022 case T___builtin_expect:
6023 return make_function_2_type(type_long, type_long, type_long);
6025 internal_errorf(HERE, "not implemented builtin symbol found");
6030 * Performs automatic type cast as described in § 6.3.2.1.
6032 * @param orig_type the original type
6034 static type_t *automatic_type_conversion(type_t *orig_type)
6036 type_t *type = skip_typeref(orig_type);
6037 if (is_type_array(type)) {
6038 array_type_t *array_type = &type->array;
6039 type_t *element_type = array_type->element_type;
6040 unsigned qualifiers = array_type->base.qualifiers;
6042 return make_pointer_type(element_type, qualifiers);
6045 if (is_type_function(type)) {
6046 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6053 * reverts the automatic casts of array to pointer types and function
6054 * to function-pointer types as defined § 6.3.2.1
6056 type_t *revert_automatic_type_conversion(const expression_t *expression)
6058 switch (expression->kind) {
6059 case EXPR_REFERENCE: return expression->reference.declaration->type;
6062 return get_qualified_type(expression->select.compound_entry->type,
6063 expression->base.type->base.qualifiers);
6065 case EXPR_UNARY_DEREFERENCE: {
6066 const expression_t *const value = expression->unary.value;
6067 type_t *const type = skip_typeref(value->base.type);
6068 assert(is_type_pointer(type));
6069 return type->pointer.points_to;
6072 case EXPR_BUILTIN_SYMBOL:
6073 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6075 case EXPR_ARRAY_ACCESS: {
6076 const expression_t *array_ref = expression->array_access.array_ref;
6077 type_t *type_left = skip_typeref(array_ref->base.type);
6078 if (!is_type_valid(type_left))
6080 assert(is_type_pointer(type_left));
6081 return type_left->pointer.points_to;
6084 case EXPR_STRING_LITERAL: {
6085 size_t size = expression->string.value.size;
6086 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6089 case EXPR_WIDE_STRING_LITERAL: {
6090 size_t size = expression->wide_string.value.size;
6091 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6094 case EXPR_COMPOUND_LITERAL:
6095 return expression->compound_literal.type;
6100 return expression->base.type;
6103 static expression_t *parse_reference(void)
6105 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
6107 reference_expression_t *ref = &expression->reference;
6108 symbol_t *const symbol = token.v.symbol;
6110 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
6112 if (declaration == NULL) {
6113 if (!strict_mode && look_ahead(1)->type == '(') {
6114 /* an implicitly declared function */
6115 if (warning.implicit_function_declaration) {
6116 warningf(HERE, "implicit declaration of function '%Y'",
6120 declaration = create_implicit_function(symbol, HERE);
6122 errorf(HERE, "unknown symbol '%Y' found.", symbol);
6123 declaration = create_error_declaration(symbol, STORAGE_CLASS_NONE);
6127 type_t *orig_type = declaration->type;
6129 /* we always do the auto-type conversions; the & and sizeof parser contains
6130 * code to revert this! */
6131 type_t *type = automatic_type_conversion(orig_type);
6133 ref->declaration = declaration;
6134 ref->base.type = type;
6136 /* this declaration is used */
6137 declaration->used = true;
6139 if (declaration->parent_scope != file_scope &&
6140 declaration->parent_scope->depth < current_function->scope.depth &&
6141 is_type_valid(orig_type) && !is_type_function(orig_type)) {
6142 /* access of a variable from an outer function */
6143 declaration->address_taken = true;
6144 ref->is_outer_ref = true;
6145 current_function->need_closure = true;
6148 /* check for deprecated functions */
6149 if (warning.deprecated_declarations &&
6150 declaration->modifiers & DM_DEPRECATED) {
6151 char const *const prefix = is_type_function(declaration->type) ?
6152 "function" : "variable";
6154 if (declaration->deprecated_string != NULL) {
6155 warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6156 prefix, declaration->symbol, &declaration->source_position,
6157 declaration->deprecated_string);
6159 warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6160 declaration->symbol, &declaration->source_position);
6163 if (warning.init_self && declaration == current_init_decl && !in_type_prop) {
6164 current_init_decl = NULL;
6165 warningf(HERE, "variable '%#T' is initialized by itself",
6166 declaration->type, declaration->symbol);
6173 static bool semantic_cast(expression_t *cast)
6175 expression_t *expression = cast->unary.value;
6176 type_t *orig_dest_type = cast->base.type;
6177 type_t *orig_type_right = expression->base.type;
6178 type_t const *dst_type = skip_typeref(orig_dest_type);
6179 type_t const *src_type = skip_typeref(orig_type_right);
6180 source_position_t const *pos = &cast->base.source_position;
6182 /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6183 if (dst_type == type_void)
6186 /* only integer and pointer can be casted to pointer */
6187 if (is_type_pointer(dst_type) &&
6188 !is_type_pointer(src_type) &&
6189 !is_type_integer(src_type) &&
6190 is_type_valid(src_type)) {
6191 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6195 if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6196 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6200 if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6201 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6205 if (warning.cast_qual &&
6206 is_type_pointer(src_type) &&
6207 is_type_pointer(dst_type)) {
6208 type_t *src = skip_typeref(src_type->pointer.points_to);
6209 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6210 unsigned missing_qualifiers =
6211 src->base.qualifiers & ~dst->base.qualifiers;
6212 if (missing_qualifiers != 0) {
6214 "cast discards qualifiers '%Q' in pointer target type of '%T'",
6215 missing_qualifiers, orig_type_right);
6221 static expression_t *parse_compound_literal(type_t *type)
6223 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6225 parse_initializer_env_t env;
6227 env.declaration = NULL;
6228 env.must_be_constant = false;
6229 initializer_t *initializer = parse_initializer(&env);
6232 expression->compound_literal.initializer = initializer;
6233 expression->compound_literal.type = type;
6234 expression->base.type = automatic_type_conversion(type);
6240 * Parse a cast expression.
6242 static expression_t *parse_cast(void)
6244 add_anchor_token(')');
6246 source_position_t source_position = token.source_position;
6248 type_t *type = parse_typename();
6250 rem_anchor_token(')');
6253 if (token.type == '{') {
6254 return parse_compound_literal(type);
6257 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6258 cast->base.source_position = source_position;
6260 expression_t *value = parse_sub_expression(20);
6261 cast->base.type = type;
6262 cast->unary.value = value;
6264 if (! semantic_cast(cast)) {
6265 /* TODO: record the error in the AST. else it is impossible to detect it */
6270 return create_invalid_expression();
6274 * Parse a statement expression.
6276 static expression_t *parse_statement_expression(void)
6278 add_anchor_token(')');
6280 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6282 statement_t *statement = parse_compound_statement(true);
6283 expression->statement.statement = statement;
6284 expression->base.source_position = statement->base.source_position;
6286 /* find last statement and use its type */
6287 type_t *type = type_void;
6288 const statement_t *stmt = statement->compound.statements;
6290 while (stmt->base.next != NULL)
6291 stmt = stmt->base.next;
6293 if (stmt->kind == STATEMENT_EXPRESSION) {
6294 type = stmt->expression.expression->base.type;
6297 warningf(&expression->base.source_position, "empty statement expression ({})");
6299 expression->base.type = type;
6301 rem_anchor_token(')');
6309 * Parse a parenthesized expression.
6311 static expression_t *parse_parenthesized_expression(void)
6315 switch(token.type) {
6317 /* gcc extension: a statement expression */
6318 return parse_statement_expression();
6322 return parse_cast();
6324 if (is_typedef_symbol(token.v.symbol)) {
6325 return parse_cast();
6329 add_anchor_token(')');
6330 expression_t *result = parse_expression();
6331 rem_anchor_token(')');
6338 static expression_t *parse_function_keyword(void)
6343 if (current_function == NULL) {
6344 errorf(HERE, "'__func__' used outside of a function");
6347 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6348 expression->base.type = type_char_ptr;
6349 expression->funcname.kind = FUNCNAME_FUNCTION;
6354 static expression_t *parse_pretty_function_keyword(void)
6356 eat(T___PRETTY_FUNCTION__);
6358 if (current_function == NULL) {
6359 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6362 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6363 expression->base.type = type_char_ptr;
6364 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6369 static expression_t *parse_funcsig_keyword(void)
6373 if (current_function == NULL) {
6374 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6377 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6378 expression->base.type = type_char_ptr;
6379 expression->funcname.kind = FUNCNAME_FUNCSIG;
6384 static expression_t *parse_funcdname_keyword(void)
6386 eat(T___FUNCDNAME__);
6388 if (current_function == NULL) {
6389 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6392 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
6393 expression->base.type = type_char_ptr;
6394 expression->funcname.kind = FUNCNAME_FUNCDNAME;
6399 static designator_t *parse_designator(void)
6401 designator_t *result = allocate_ast_zero(sizeof(result[0]));
6402 result->source_position = *HERE;
6404 if (token.type != T_IDENTIFIER) {
6405 parse_error_expected("while parsing member designator",
6406 T_IDENTIFIER, NULL);
6409 result->symbol = token.v.symbol;
6412 designator_t *last_designator = result;
6414 if (token.type == '.') {
6416 if (token.type != T_IDENTIFIER) {
6417 parse_error_expected("while parsing member designator",
6418 T_IDENTIFIER, NULL);
6421 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6422 designator->source_position = *HERE;
6423 designator->symbol = token.v.symbol;
6426 last_designator->next = designator;
6427 last_designator = designator;
6430 if (token.type == '[') {
6432 add_anchor_token(']');
6433 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
6434 designator->source_position = *HERE;
6435 designator->array_index = parse_expression();
6436 rem_anchor_token(']');
6438 if (designator->array_index == NULL) {
6442 last_designator->next = designator;
6443 last_designator = designator;
6455 * Parse the __builtin_offsetof() expression.
6457 static expression_t *parse_offsetof(void)
6459 eat(T___builtin_offsetof);
6461 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6462 expression->base.type = type_size_t;
6465 add_anchor_token(',');
6466 type_t *type = parse_typename();
6467 rem_anchor_token(',');
6469 add_anchor_token(')');
6470 designator_t *designator = parse_designator();
6471 rem_anchor_token(')');
6474 expression->offsetofe.type = type;
6475 expression->offsetofe.designator = designator;
6478 memset(&path, 0, sizeof(path));
6479 path.top_type = type;
6480 path.path = NEW_ARR_F(type_path_entry_t, 0);
6482 descend_into_subtype(&path);
6484 if (!walk_designator(&path, designator, true)) {
6485 return create_invalid_expression();
6488 DEL_ARR_F(path.path);
6492 return create_invalid_expression();
6496 * Parses a _builtin_va_start() expression.
6498 static expression_t *parse_va_start(void)
6500 eat(T___builtin_va_start);
6502 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6505 add_anchor_token(',');
6506 expression->va_starte.ap = parse_assignment_expression();
6507 rem_anchor_token(',');
6509 expression_t *const expr = parse_assignment_expression();
6510 if (expr->kind == EXPR_REFERENCE) {
6511 declaration_t *const decl = expr->reference.declaration;
6512 if (decl->parent_scope != ¤t_function->scope || decl->next != NULL) {
6513 errorf(&expr->base.source_position,
6514 "second argument of 'va_start' must be last parameter of the current function");
6516 expression->va_starte.parameter = decl;
6522 return create_invalid_expression();
6526 * Parses a _builtin_va_arg() expression.
6528 static expression_t *parse_va_arg(void)
6530 eat(T___builtin_va_arg);
6532 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6535 expression->va_arge.ap = parse_assignment_expression();
6537 expression->base.type = parse_typename();
6542 return create_invalid_expression();
6545 static expression_t *parse_builtin_symbol(void)
6547 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
6549 symbol_t *symbol = token.v.symbol;
6551 expression->builtin_symbol.symbol = symbol;
6554 type_t *type = get_builtin_symbol_type(symbol);
6555 type = automatic_type_conversion(type);
6557 expression->base.type = type;
6562 * Parses a __builtin_constant() expression.
6564 static expression_t *parse_builtin_constant(void)
6566 eat(T___builtin_constant_p);
6568 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6571 add_anchor_token(')');
6572 expression->builtin_constant.value = parse_assignment_expression();
6573 rem_anchor_token(')');
6575 expression->base.type = type_int;
6579 return create_invalid_expression();
6583 * Parses a __builtin_prefetch() expression.
6585 static expression_t *parse_builtin_prefetch(void)
6587 eat(T___builtin_prefetch);
6589 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
6592 add_anchor_token(')');
6593 expression->builtin_prefetch.adr = parse_assignment_expression();
6594 if (token.type == ',') {
6596 expression->builtin_prefetch.rw = parse_assignment_expression();
6598 if (token.type == ',') {
6600 expression->builtin_prefetch.locality = parse_assignment_expression();
6602 rem_anchor_token(')');
6604 expression->base.type = type_void;
6608 return create_invalid_expression();
6612 * Parses a __builtin_is_*() compare expression.
6614 static expression_t *parse_compare_builtin(void)
6616 expression_t *expression;
6618 switch(token.type) {
6619 case T___builtin_isgreater:
6620 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6622 case T___builtin_isgreaterequal:
6623 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6625 case T___builtin_isless:
6626 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6628 case T___builtin_islessequal:
6629 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6631 case T___builtin_islessgreater:
6632 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6634 case T___builtin_isunordered:
6635 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6638 internal_errorf(HERE, "invalid compare builtin found");
6640 expression->base.source_position = *HERE;
6644 expression->binary.left = parse_assignment_expression();
6646 expression->binary.right = parse_assignment_expression();
6649 type_t *const orig_type_left = expression->binary.left->base.type;
6650 type_t *const orig_type_right = expression->binary.right->base.type;
6652 type_t *const type_left = skip_typeref(orig_type_left);
6653 type_t *const type_right = skip_typeref(orig_type_right);
6654 if (!is_type_float(type_left) && !is_type_float(type_right)) {
6655 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6656 type_error_incompatible("invalid operands in comparison",
6657 &expression->base.source_position, orig_type_left, orig_type_right);
6660 semantic_comparison(&expression->binary);
6665 return create_invalid_expression();
6670 * Parses a __builtin_expect() expression.
6672 static expression_t *parse_builtin_expect(void)
6674 eat(T___builtin_expect);
6676 expression_t *expression
6677 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
6680 expression->binary.left = parse_assignment_expression();
6682 expression->binary.right = parse_constant_expression();
6685 expression->base.type = expression->binary.left->base.type;
6689 return create_invalid_expression();
6694 * Parses a MS assume() expression.
6696 static expression_t *parse_assume(void)
6700 expression_t *expression
6701 = allocate_expression_zero(EXPR_UNARY_ASSUME);
6704 add_anchor_token(')');
6705 expression->unary.value = parse_assignment_expression();
6706 rem_anchor_token(')');
6709 expression->base.type = type_void;
6712 return create_invalid_expression();
6716 * Return the declaration for a given label symbol or create a new one.
6718 * @param symbol the symbol of the label
6720 static declaration_t *get_label(symbol_t *symbol)
6722 declaration_t *candidate;
6723 assert(current_function != NULL);
6725 candidate = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
6726 /* if we found a local label, we already created the declaration */
6727 if (candidate != NULL) {
6728 if (candidate->parent_scope != scope) {
6729 assert(candidate->parent_scope->depth < scope->depth);
6730 current_function->goto_to_outer = true;
6735 candidate = get_declaration(symbol, NAMESPACE_LABEL);
6736 /* if we found a label in the same function, then we already created the
6738 if (candidate != NULL
6739 && candidate->parent_scope == ¤t_function->scope) {
6743 /* otherwise we need to create a new one */
6744 declaration_t *const declaration = allocate_declaration_zero();
6745 declaration->namespc = NAMESPACE_LABEL;
6746 declaration->symbol = symbol;
6748 label_push(declaration);
6754 * Parses a GNU && label address expression.
6756 static expression_t *parse_label_address(void)
6758 source_position_t source_position = token.source_position;
6760 if (token.type != T_IDENTIFIER) {
6761 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6764 symbol_t *symbol = token.v.symbol;
6767 declaration_t *label = get_label(symbol);
6770 label->address_taken = true;
6772 expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6773 expression->base.source_position = source_position;
6775 /* label address is threaten as a void pointer */
6776 expression->base.type = type_void_ptr;
6777 expression->label_address.declaration = label;
6780 return create_invalid_expression();
6784 * Parse a microsoft __noop expression.
6786 static expression_t *parse_noop_expression(void)
6788 source_position_t source_position = *HERE;
6791 if (token.type == '(') {
6792 /* parse arguments */
6794 add_anchor_token(')');
6795 add_anchor_token(',');
6797 if (token.type != ')') {
6799 (void)parse_assignment_expression();
6800 if (token.type != ',')
6806 rem_anchor_token(',');
6807 rem_anchor_token(')');
6810 /* the result is a (int)0 */
6811 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
6812 cnst->base.source_position = source_position;
6813 cnst->base.type = type_int;
6814 cnst->conste.v.int_value = 0;
6815 cnst->conste.is_ms_noop = true;
6820 return create_invalid_expression();
6824 * Parses a primary expression.
6826 static expression_t *parse_primary_expression(void)
6828 switch (token.type) {
6829 case T_INTEGER: return parse_int_const();
6830 case T_CHARACTER_CONSTANT: return parse_character_constant();
6831 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
6832 case T_FLOATINGPOINT: return parse_float_const();
6833 case T_STRING_LITERAL:
6834 case T_WIDE_STRING_LITERAL: return parse_string_const();
6835 case T_IDENTIFIER: return parse_reference();
6836 case T___FUNCTION__:
6837 case T___func__: return parse_function_keyword();
6838 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
6839 case T___FUNCSIG__: return parse_funcsig_keyword();
6840 case T___FUNCDNAME__: return parse_funcdname_keyword();
6841 case T___builtin_offsetof: return parse_offsetof();
6842 case T___builtin_va_start: return parse_va_start();
6843 case T___builtin_va_arg: return parse_va_arg();
6844 case T___builtin_expect:
6845 case T___builtin_alloca:
6846 case T___builtin_nan:
6847 case T___builtin_nand:
6848 case T___builtin_nanf:
6849 case T___builtin_huge_val:
6850 case T___builtin_va_end: return parse_builtin_symbol();
6851 case T___builtin_isgreater:
6852 case T___builtin_isgreaterequal:
6853 case T___builtin_isless:
6854 case T___builtin_islessequal:
6855 case T___builtin_islessgreater:
6856 case T___builtin_isunordered: return parse_compare_builtin();
6857 case T___builtin_constant_p: return parse_builtin_constant();
6858 case T___builtin_prefetch: return parse_builtin_prefetch();
6859 case T__assume: return parse_assume();
6862 return parse_label_address();
6865 case '(': return parse_parenthesized_expression();
6866 case T___noop: return parse_noop_expression();
6869 errorf(HERE, "unexpected token %K, expected an expression", &token);
6870 return create_invalid_expression();
6874 * Check if the expression has the character type and issue a warning then.
6876 static void check_for_char_index_type(const expression_t *expression)
6878 type_t *const type = expression->base.type;
6879 const type_t *const base_type = skip_typeref(type);
6881 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
6882 warning.char_subscripts) {
6883 warningf(&expression->base.source_position,
6884 "array subscript has type '%T'", type);
6888 static expression_t *parse_array_expression(unsigned precedence,
6894 add_anchor_token(']');
6896 expression_t *inside = parse_expression();
6898 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6900 array_access_expression_t *array_access = &expression->array_access;
6902 type_t *const orig_type_left = left->base.type;
6903 type_t *const orig_type_inside = inside->base.type;
6905 type_t *const type_left = skip_typeref(orig_type_left);
6906 type_t *const type_inside = skip_typeref(orig_type_inside);
6908 type_t *return_type;
6909 if (is_type_pointer(type_left)) {
6910 return_type = type_left->pointer.points_to;
6911 array_access->array_ref = left;
6912 array_access->index = inside;
6913 check_for_char_index_type(inside);
6914 } else if (is_type_pointer(type_inside)) {
6915 return_type = type_inside->pointer.points_to;
6916 array_access->array_ref = inside;
6917 array_access->index = left;
6918 array_access->flipped = true;
6919 check_for_char_index_type(left);
6921 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
6923 "array access on object with non-pointer types '%T', '%T'",
6924 orig_type_left, orig_type_inside);
6926 return_type = type_error_type;
6927 array_access->array_ref = left;
6928 array_access->index = inside;
6931 expression->base.type = automatic_type_conversion(return_type);
6933 rem_anchor_token(']');
6934 if (token.type == ']') {
6937 parse_error_expected("Problem while parsing array access", ']', NULL);
6942 static expression_t *parse_typeprop(expression_kind_t const kind,
6943 source_position_t const pos,
6944 unsigned const precedence)
6946 expression_t *tp_expression = allocate_expression_zero(kind);
6947 tp_expression->base.type = type_size_t;
6948 tp_expression->base.source_position = pos;
6950 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6952 /* we only refer to a type property, mark this case */
6953 bool old = in_type_prop;
6954 in_type_prop = true;
6955 if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6957 add_anchor_token(')');
6958 type_t* const orig_type = parse_typename();
6959 tp_expression->typeprop.type = orig_type;
6961 type_t const* const type = skip_typeref(orig_type);
6962 char const* const wrong_type =
6963 is_type_incomplete(type) ? "incomplete" :
6964 type->kind == TYPE_FUNCTION ? "function designator" :
6965 type->kind == TYPE_BITFIELD ? "bitfield" :
6967 if (wrong_type != NULL) {
6968 errorf(&pos, "operand of %s expression must not be %s type '%T'",
6969 what, wrong_type, type);
6972 rem_anchor_token(')');
6975 expression_t *expression = parse_sub_expression(precedence);
6977 type_t* const orig_type = revert_automatic_type_conversion(expression);
6978 expression->base.type = orig_type;
6980 type_t const* const type = skip_typeref(orig_type);
6981 char const* const wrong_type =
6982 is_type_incomplete(type) ? "incomplete" :
6983 type->kind == TYPE_FUNCTION ? "function designator" :
6984 type->kind == TYPE_BITFIELD ? "bitfield" :
6986 if (wrong_type != NULL) {
6987 errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6990 tp_expression->typeprop.type = expression->base.type;
6991 tp_expression->typeprop.tp_expression = expression;
6996 return tp_expression;
6999 static expression_t *parse_sizeof(unsigned precedence)
7001 source_position_t pos = *HERE;
7003 return parse_typeprop(EXPR_SIZEOF, pos, precedence);
7006 static expression_t *parse_alignof(unsigned precedence)
7008 source_position_t pos = *HERE;
7010 return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
7013 static expression_t *parse_select_expression(unsigned precedence,
7014 expression_t *compound)
7017 assert(token.type == '.' || token.type == T_MINUSGREATER);
7019 bool is_pointer = (token.type == T_MINUSGREATER);
7022 expression_t *select = allocate_expression_zero(EXPR_SELECT);
7023 select->select.compound = compound;
7025 if (token.type != T_IDENTIFIER) {
7026 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7029 symbol_t *symbol = token.v.symbol;
7032 type_t *const orig_type = compound->base.type;
7033 type_t *const type = skip_typeref(orig_type);
7036 bool saw_error = false;
7037 if (is_type_pointer(type)) {
7040 "request for member '%Y' in something not a struct or union, but '%T'",
7044 type_left = skip_typeref(type->pointer.points_to);
7046 if (is_pointer && is_type_valid(type)) {
7047 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7053 declaration_t *entry;
7054 if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7055 type_left->kind == TYPE_COMPOUND_UNION) {
7056 declaration_t *const declaration = type_left->compound.declaration;
7058 if (!declaration->init.complete) {
7059 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7061 goto create_error_entry;
7064 entry = find_compound_entry(declaration, symbol);
7065 if (entry == NULL) {
7066 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7067 goto create_error_entry;
7070 if (is_type_valid(type_left) && !saw_error) {
7072 "request for member '%Y' in something not a struct or union, but '%T'",
7076 entry = allocate_declaration_zero();
7077 entry->symbol = symbol;
7080 select->select.compound_entry = entry;
7082 type_t *const res_type =
7083 get_qualified_type(entry->type, type_left->base.qualifiers);
7085 /* we always do the auto-type conversions; the & and sizeof parser contains
7086 * code to revert this! */
7087 select->base.type = automatic_type_conversion(res_type);
7089 type_t *skipped = skip_typeref(res_type);
7090 if (skipped->kind == TYPE_BITFIELD) {
7091 select->base.type = skipped->bitfield.base_type;
7097 static void check_call_argument(const function_parameter_t *parameter,
7098 call_argument_t *argument, unsigned pos)
7100 type_t *expected_type = parameter->type;
7101 type_t *expected_type_skip = skip_typeref(expected_type);
7102 assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE;
7103 expression_t *arg_expr = argument->expression;
7104 type_t *arg_type = skip_typeref(arg_expr->base.type);
7106 /* handle transparent union gnu extension */
7107 if (is_type_union(expected_type_skip)
7108 && (expected_type_skip->base.modifiers
7109 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7110 declaration_t *union_decl = expected_type_skip->compound.declaration;
7112 declaration_t *declaration = union_decl->scope.declarations;
7113 type_t *best_type = NULL;
7114 for ( ; declaration != NULL; declaration = declaration->next) {
7115 type_t *decl_type = declaration->type;
7116 error = semantic_assign(decl_type, arg_expr);
7117 if (error == ASSIGN_ERROR_INCOMPATIBLE
7118 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7121 if (error == ASSIGN_SUCCESS) {
7122 best_type = decl_type;
7123 } else if (best_type == NULL) {
7124 best_type = decl_type;
7128 if (best_type != NULL) {
7129 expected_type = best_type;
7133 error = semantic_assign(expected_type, arg_expr);
7134 argument->expression = create_implicit_cast(argument->expression,
7137 if (error != ASSIGN_SUCCESS) {
7138 /* report exact scope in error messages (like "in argument 3") */
7140 snprintf(buf, sizeof(buf), "call argument %u", pos);
7141 report_assign_error(error, expected_type, arg_expr, buf,
7142 &arg_expr->base.source_position);
7143 } else if (warning.traditional || warning.conversion) {
7144 type_t *const promoted_type = get_default_promoted_type(arg_type);
7145 if (!types_compatible(expected_type_skip, promoted_type) &&
7146 !types_compatible(expected_type_skip, type_void_ptr) &&
7147 !types_compatible(type_void_ptr, promoted_type)) {
7148 /* Deliberately show the skipped types in this warning */
7149 warningf(&arg_expr->base.source_position,
7150 "passing call argument %u as '%T' rather than '%T' due to prototype",
7151 pos, expected_type_skip, promoted_type);
7157 * Parse a call expression, ie. expression '( ... )'.
7159 * @param expression the function address
7161 static expression_t *parse_call_expression(unsigned precedence,
7162 expression_t *expression)
7165 expression_t *result = allocate_expression_zero(EXPR_CALL);
7166 result->base.source_position = expression->base.source_position;
7168 call_expression_t *call = &result->call;
7169 call->function = expression;
7171 type_t *const orig_type = expression->base.type;
7172 type_t *const type = skip_typeref(orig_type);
7174 function_type_t *function_type = NULL;
7175 if (is_type_pointer(type)) {
7176 type_t *const to_type = skip_typeref(type->pointer.points_to);
7178 if (is_type_function(to_type)) {
7179 function_type = &to_type->function;
7180 call->base.type = function_type->return_type;
7184 if (function_type == NULL && is_type_valid(type)) {
7185 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7188 /* parse arguments */
7190 add_anchor_token(')');
7191 add_anchor_token(',');
7193 if (token.type != ')') {
7194 call_argument_t *last_argument = NULL;
7197 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7199 argument->expression = parse_assignment_expression();
7200 if (last_argument == NULL) {
7201 call->arguments = argument;
7203 last_argument->next = argument;
7205 last_argument = argument;
7207 if (token.type != ',')
7212 rem_anchor_token(',');
7213 rem_anchor_token(')');
7216 if (function_type == NULL)
7219 function_parameter_t *parameter = function_type->parameters;
7220 call_argument_t *argument = call->arguments;
7221 if (!function_type->unspecified_parameters) {
7222 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7223 parameter = parameter->next, argument = argument->next) {
7224 check_call_argument(parameter, argument, ++pos);
7227 if (parameter != NULL) {
7228 errorf(HERE, "too few arguments to function '%E'", expression);
7229 } else if (argument != NULL && !function_type->variadic) {
7230 errorf(HERE, "too many arguments to function '%E'", expression);
7234 /* do default promotion */
7235 for( ; argument != NULL; argument = argument->next) {
7236 type_t *type = argument->expression->base.type;
7238 type = get_default_promoted_type(type);
7240 argument->expression
7241 = create_implicit_cast(argument->expression, type);
7244 check_format(&result->call);
7246 if (warning.aggregate_return &&
7247 is_type_compound(skip_typeref(function_type->return_type))) {
7248 warningf(&result->base.source_position,
7249 "function call has aggregate value");
7256 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7258 static bool same_compound_type(const type_t *type1, const type_t *type2)
7261 is_type_compound(type1) &&
7262 type1->kind == type2->kind &&
7263 type1->compound.declaration == type2->compound.declaration;
7267 * Parse a conditional expression, ie. 'expression ? ... : ...'.
7269 * @param expression the conditional expression
7271 static expression_t *parse_conditional_expression(unsigned precedence,
7272 expression_t *expression)
7274 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7276 conditional_expression_t *conditional = &result->conditional;
7277 conditional->base.source_position = *HERE;
7278 conditional->condition = expression;
7281 add_anchor_token(':');
7284 type_t *const condition_type_orig = expression->base.type;
7285 type_t *const condition_type = skip_typeref(condition_type_orig);
7286 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
7287 type_error("expected a scalar type in conditional condition",
7288 &expression->base.source_position, condition_type_orig);
7291 expression_t *true_expression = expression;
7292 bool gnu_cond = false;
7293 if (GNU_MODE && token.type == ':') {
7296 true_expression = parse_expression();
7297 rem_anchor_token(':');
7299 expression_t *false_expression = parse_sub_expression(precedence);
7301 type_t *const orig_true_type = true_expression->base.type;
7302 type_t *const orig_false_type = false_expression->base.type;
7303 type_t *const true_type = skip_typeref(orig_true_type);
7304 type_t *const false_type = skip_typeref(orig_false_type);
7307 type_t *result_type;
7308 if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7309 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7310 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
7311 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7312 warningf(&conditional->base.source_position,
7313 "ISO C forbids conditional expression with only one void side");
7315 result_type = type_void;
7316 } else if (is_type_arithmetic(true_type)
7317 && is_type_arithmetic(false_type)) {
7318 result_type = semantic_arithmetic(true_type, false_type);
7320 true_expression = create_implicit_cast(true_expression, result_type);
7321 false_expression = create_implicit_cast(false_expression, result_type);
7323 conditional->true_expression = true_expression;
7324 conditional->false_expression = false_expression;
7325 conditional->base.type = result_type;
7326 } else if (same_compound_type(true_type, false_type)) {
7327 /* just take 1 of the 2 types */
7328 result_type = true_type;
7329 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7330 type_t *pointer_type;
7332 expression_t *other_expression;
7333 if (is_type_pointer(true_type) &&
7334 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7335 pointer_type = true_type;
7336 other_type = false_type;
7337 other_expression = false_expression;
7339 pointer_type = false_type;
7340 other_type = true_type;
7341 other_expression = true_expression;
7344 if (is_null_pointer_constant(other_expression)) {
7345 result_type = pointer_type;
7346 } else if (is_type_pointer(other_type)) {
7347 type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7348 type_t *to2 = skip_typeref(other_type->pointer.points_to);
7351 if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7352 is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7354 } else if (types_compatible(get_unqualified_type(to1),
7355 get_unqualified_type(to2))) {
7358 warningf(&conditional->base.source_position,
7359 "pointer types '%T' and '%T' in conditional expression are incompatible",
7360 true_type, false_type);
7364 type_t *const type =
7365 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7366 result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7367 } else if (is_type_integer(other_type)) {
7368 warningf(&conditional->base.source_position,
7369 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7370 result_type = pointer_type;
7372 type_error_incompatible("while parsing conditional",
7373 &expression->base.source_position, true_type, false_type);
7374 result_type = type_error_type;
7377 /* TODO: one pointer to void*, other some pointer */
7379 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7380 type_error_incompatible("while parsing conditional",
7381 &conditional->base.source_position, true_type,
7384 result_type = type_error_type;
7387 conditional->true_expression
7388 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7389 conditional->false_expression
7390 = create_implicit_cast(false_expression, result_type);
7391 conditional->base.type = result_type;
7394 return create_invalid_expression();
7398 * Parse an extension expression.
7400 static expression_t *parse_extension(unsigned precedence)
7402 eat(T___extension__);
7404 bool old_gcc_extension = in_gcc_extension;
7405 in_gcc_extension = true;
7406 expression_t *expression = parse_sub_expression(precedence);
7407 in_gcc_extension = old_gcc_extension;
7412 * Parse a __builtin_classify_type() expression.
7414 static expression_t *parse_builtin_classify_type(const unsigned precedence)
7416 eat(T___builtin_classify_type);
7418 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7419 result->base.type = type_int;
7422 add_anchor_token(')');
7423 expression_t *expression = parse_sub_expression(precedence);
7424 rem_anchor_token(')');
7426 result->classify_type.type_expression = expression;
7430 return create_invalid_expression();
7433 static bool check_pointer_arithmetic(const source_position_t *source_position,
7434 type_t *pointer_type,
7435 type_t *orig_pointer_type)
7437 type_t *points_to = pointer_type->pointer.points_to;
7438 points_to = skip_typeref(points_to);
7440 if (is_type_incomplete(points_to)) {
7441 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7442 errorf(source_position,
7443 "arithmetic with pointer to incomplete type '%T' not allowed",
7446 } else if (warning.pointer_arith) {
7447 warningf(source_position,
7448 "pointer of type '%T' used in arithmetic",
7451 } else if (is_type_function(points_to)) {
7453 errorf(source_position,
7454 "arithmetic with pointer to function type '%T' not allowed",
7457 } else if (warning.pointer_arith) {
7458 warningf(source_position,
7459 "pointer to a function '%T' used in arithmetic",
7466 static bool is_lvalue(const expression_t *expression)
7468 switch (expression->kind) {
7469 case EXPR_REFERENCE:
7470 case EXPR_ARRAY_ACCESS:
7472 case EXPR_UNARY_DEREFERENCE:
7480 static void semantic_incdec(unary_expression_t *expression)
7482 type_t *const orig_type = expression->value->base.type;
7483 type_t *const type = skip_typeref(orig_type);
7484 if (is_type_pointer(type)) {
7485 if (!check_pointer_arithmetic(&expression->base.source_position,
7489 } else if (!is_type_real(type) && is_type_valid(type)) {
7490 /* TODO: improve error message */
7491 errorf(&expression->base.source_position,
7492 "operation needs an arithmetic or pointer type");
7495 if (!is_lvalue(expression->value)) {
7496 /* TODO: improve error message */
7497 errorf(&expression->base.source_position, "lvalue required as operand");
7499 expression->base.type = orig_type;
7502 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7504 type_t *const orig_type = expression->value->base.type;
7505 type_t *const type = skip_typeref(orig_type);
7506 if (!is_type_arithmetic(type)) {
7507 if (is_type_valid(type)) {
7508 /* TODO: improve error message */
7509 errorf(&expression->base.source_position,
7510 "operation needs an arithmetic type");
7515 expression->base.type = orig_type;
7518 static void semantic_unexpr_plus(unary_expression_t *expression)
7520 semantic_unexpr_arithmetic(expression);
7521 if (warning.traditional)
7522 warningf(&expression->base.source_position,
7523 "traditional C rejects the unary plus operator");
7526 static expression_t const *get_reference_address(expression_t const *expr)
7528 bool regular_take_address = true;
7530 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7531 expr = expr->unary.value;
7533 regular_take_address = false;
7536 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7539 expr = expr->unary.value;
7542 if (expr->kind != EXPR_REFERENCE)
7545 if (!regular_take_address &&
7546 !is_type_function(skip_typeref(expr->reference.declaration->type))) {
7553 static void warn_function_address_as_bool(expression_t const* expr)
7555 if (!warning.address)
7558 expr = get_reference_address(expr);
7560 warningf(&expr->base.source_position,
7561 "the address of '%Y' will always evaluate as 'true'",
7562 expr->reference.declaration->symbol);
7566 static void semantic_not(unary_expression_t *expression)
7568 type_t *const orig_type = expression->value->base.type;
7569 type_t *const type = skip_typeref(orig_type);
7570 if (!is_type_scalar(type) && is_type_valid(type)) {
7571 errorf(&expression->base.source_position,
7572 "operand of ! must be of scalar type");
7575 warn_function_address_as_bool(expression->value);
7577 expression->base.type = type_int;
7580 static void semantic_unexpr_integer(unary_expression_t *expression)
7582 type_t *const orig_type = expression->value->base.type;
7583 type_t *const type = skip_typeref(orig_type);
7584 if (!is_type_integer(type)) {
7585 if (is_type_valid(type)) {
7586 errorf(&expression->base.source_position,
7587 "operand of ~ must be of integer type");
7592 expression->base.type = orig_type;
7595 static void semantic_dereference(unary_expression_t *expression)
7597 type_t *const orig_type = expression->value->base.type;
7598 type_t *const type = skip_typeref(orig_type);
7599 if (!is_type_pointer(type)) {
7600 if (is_type_valid(type)) {
7601 errorf(&expression->base.source_position,
7602 "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7607 type_t *result_type = type->pointer.points_to;
7608 result_type = automatic_type_conversion(result_type);
7609 expression->base.type = result_type;
7613 * Record that an address is taken (expression represents an lvalue).
7615 * @param expression the expression
7616 * @param may_be_register if true, the expression might be an register
7618 static void set_address_taken(expression_t *expression, bool may_be_register)
7620 if (expression->kind != EXPR_REFERENCE)
7623 declaration_t *const declaration = expression->reference.declaration;
7624 /* happens for parse errors */
7625 if (declaration == NULL)
7628 if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
7629 errorf(&expression->base.source_position,
7630 "address of register variable '%Y' requested",
7631 declaration->symbol);
7633 declaration->address_taken = 1;
7638 * Check the semantic of the address taken expression.
7640 static void semantic_take_addr(unary_expression_t *expression)
7642 expression_t *value = expression->value;
7643 value->base.type = revert_automatic_type_conversion(value);
7645 type_t *orig_type = value->base.type;
7646 if (!is_type_valid(orig_type))
7649 set_address_taken(value, false);
7651 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7654 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
7655 static expression_t *parse_##unexpression_type(unsigned precedence) \
7657 expression_t *unary_expression \
7658 = allocate_expression_zero(unexpression_type); \
7659 unary_expression->base.source_position = *HERE; \
7661 unary_expression->unary.value = parse_sub_expression(precedence); \
7663 sfunc(&unary_expression->unary); \
7665 return unary_expression; \
7668 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7669 semantic_unexpr_arithmetic)
7670 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7671 semantic_unexpr_plus)
7672 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7674 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7675 semantic_dereference)
7676 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7678 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7679 semantic_unexpr_integer)
7680 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
7682 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7685 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7687 static expression_t *parse_##unexpression_type(unsigned precedence, \
7688 expression_t *left) \
7690 (void) precedence; \
7692 expression_t *unary_expression \
7693 = allocate_expression_zero(unexpression_type); \
7694 unary_expression->base.source_position = *HERE; \
7696 unary_expression->unary.value = left; \
7698 sfunc(&unary_expression->unary); \
7700 return unary_expression; \
7703 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7704 EXPR_UNARY_POSTFIX_INCREMENT,
7706 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7707 EXPR_UNARY_POSTFIX_DECREMENT,
7710 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7712 /* TODO: handle complex + imaginary types */
7714 type_left = get_unqualified_type(type_left);
7715 type_right = get_unqualified_type(type_right);
7717 /* § 6.3.1.8 Usual arithmetic conversions */
7718 if (type_left == type_long_double || type_right == type_long_double) {
7719 return type_long_double;
7720 } else if (type_left == type_double || type_right == type_double) {
7722 } else if (type_left == type_float || type_right == type_float) {
7726 type_left = promote_integer(type_left);
7727 type_right = promote_integer(type_right);
7729 if (type_left == type_right)
7732 bool const signed_left = is_type_signed(type_left);
7733 bool const signed_right = is_type_signed(type_right);
7734 int const rank_left = get_rank(type_left);
7735 int const rank_right = get_rank(type_right);
7737 if (signed_left == signed_right)
7738 return rank_left >= rank_right ? type_left : type_right;
7747 u_rank = rank_right;
7748 u_type = type_right;
7750 s_rank = rank_right;
7751 s_type = type_right;
7756 if (u_rank >= s_rank)
7759 /* casting rank to atomic_type_kind is a bit hacky, but makes things
7761 if (get_atomic_type_size((atomic_type_kind_t) s_rank)
7762 > get_atomic_type_size((atomic_type_kind_t) u_rank))
7766 case ATOMIC_TYPE_INT: return type_unsigned_int;
7767 case ATOMIC_TYPE_LONG: return type_unsigned_long;
7768 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
7770 default: panic("invalid atomic type");
7775 * Check the semantic restrictions for a binary expression.
7777 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
7779 expression_t *const left = expression->left;
7780 expression_t *const right = expression->right;
7781 type_t *const orig_type_left = left->base.type;
7782 type_t *const orig_type_right = right->base.type;
7783 type_t *const type_left = skip_typeref(orig_type_left);
7784 type_t *const type_right = skip_typeref(orig_type_right);
7786 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7787 /* TODO: improve error message */
7788 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7789 errorf(&expression->base.source_position,
7790 "operation needs arithmetic types");
7795 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7796 expression->left = create_implicit_cast(left, arithmetic_type);
7797 expression->right = create_implicit_cast(right, arithmetic_type);
7798 expression->base.type = arithmetic_type;
7801 static void warn_div_by_zero(binary_expression_t const *const expression)
7803 if (!warning.div_by_zero ||
7804 !is_type_integer(expression->base.type))
7807 expression_t const *const right = expression->right;
7808 /* The type of the right operand can be different for /= */
7809 if (is_type_integer(right->base.type) &&
7810 is_constant_expression(right) &&
7811 fold_constant(right) == 0) {
7812 warningf(&expression->base.source_position, "division by zero");
7817 * Check the semantic restrictions for a div/mod expression.
7819 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
7820 semantic_binexpr_arithmetic(expression);
7821 warn_div_by_zero(expression);
7824 static void semantic_shift_op(binary_expression_t *expression)
7826 expression_t *const left = expression->left;
7827 expression_t *const right = expression->right;
7828 type_t *const orig_type_left = left->base.type;
7829 type_t *const orig_type_right = right->base.type;
7830 type_t * type_left = skip_typeref(orig_type_left);
7831 type_t * type_right = skip_typeref(orig_type_right);
7833 if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
7834 /* TODO: improve error message */
7835 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7836 errorf(&expression->base.source_position,
7837 "operands of shift operation must have integer types");
7842 type_left = promote_integer(type_left);
7843 type_right = promote_integer(type_right);
7845 expression->left = create_implicit_cast(left, type_left);
7846 expression->right = create_implicit_cast(right, type_right);
7847 expression->base.type = type_left;
7850 static void semantic_add(binary_expression_t *expression)
7852 expression_t *const left = expression->left;
7853 expression_t *const right = expression->right;
7854 type_t *const orig_type_left = left->base.type;
7855 type_t *const orig_type_right = right->base.type;
7856 type_t *const type_left = skip_typeref(orig_type_left);
7857 type_t *const type_right = skip_typeref(orig_type_right);
7860 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7861 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7862 expression->left = create_implicit_cast(left, arithmetic_type);
7863 expression->right = create_implicit_cast(right, arithmetic_type);
7864 expression->base.type = arithmetic_type;
7866 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7867 check_pointer_arithmetic(&expression->base.source_position,
7868 type_left, orig_type_left);
7869 expression->base.type = type_left;
7870 } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
7871 check_pointer_arithmetic(&expression->base.source_position,
7872 type_right, orig_type_right);
7873 expression->base.type = type_right;
7874 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7875 errorf(&expression->base.source_position,
7876 "invalid operands to binary + ('%T', '%T')",
7877 orig_type_left, orig_type_right);
7881 static void semantic_sub(binary_expression_t *expression)
7883 expression_t *const left = expression->left;
7884 expression_t *const right = expression->right;
7885 type_t *const orig_type_left = left->base.type;
7886 type_t *const orig_type_right = right->base.type;
7887 type_t *const type_left = skip_typeref(orig_type_left);
7888 type_t *const type_right = skip_typeref(orig_type_right);
7889 source_position_t const *const pos = &expression->base.source_position;
7892 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7893 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7894 expression->left = create_implicit_cast(left, arithmetic_type);
7895 expression->right = create_implicit_cast(right, arithmetic_type);
7896 expression->base.type = arithmetic_type;
7898 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7899 check_pointer_arithmetic(&expression->base.source_position,
7900 type_left, orig_type_left);
7901 expression->base.type = type_left;
7902 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7903 type_t *const unqual_left = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
7904 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
7905 if (!types_compatible(unqual_left, unqual_right)) {
7907 "subtracting pointers to incompatible types '%T' and '%T'",
7908 orig_type_left, orig_type_right);
7909 } else if (!is_type_object(unqual_left)) {
7910 if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
7911 warningf(pos, "subtracting pointers to void");
7913 errorf(pos, "subtracting pointers to non-object types '%T'",
7917 expression->base.type = type_ptrdiff_t;
7918 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7919 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
7920 orig_type_left, orig_type_right);
7924 static void warn_string_literal_address(expression_t const* expr)
7926 while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7927 expr = expr->unary.value;
7928 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7930 expr = expr->unary.value;
7933 if (expr->kind == EXPR_STRING_LITERAL ||
7934 expr->kind == EXPR_WIDE_STRING_LITERAL) {
7935 warningf(&expr->base.source_position,
7936 "comparison with string literal results in unspecified behaviour");
7941 * Check the semantics of comparison expressions.
7943 * @param expression The expression to check.
7945 static void semantic_comparison(binary_expression_t *expression)
7947 expression_t *left = expression->left;
7948 expression_t *right = expression->right;
7950 if (warning.address) {
7951 warn_string_literal_address(left);
7952 warn_string_literal_address(right);
7954 expression_t const* const func_left = get_reference_address(left);
7955 if (func_left != NULL && is_null_pointer_constant(right)) {
7956 warningf(&expression->base.source_position,
7957 "the address of '%Y' will never be NULL",
7958 func_left->reference.declaration->symbol);
7961 expression_t const* const func_right = get_reference_address(right);
7962 if (func_right != NULL && is_null_pointer_constant(right)) {
7963 warningf(&expression->base.source_position,
7964 "the address of '%Y' will never be NULL",
7965 func_right->reference.declaration->symbol);
7969 type_t *orig_type_left = left->base.type;
7970 type_t *orig_type_right = right->base.type;
7971 type_t *type_left = skip_typeref(orig_type_left);
7972 type_t *type_right = skip_typeref(orig_type_right);
7974 /* TODO non-arithmetic types */
7975 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7976 /* test for signed vs unsigned compares */
7977 if (warning.sign_compare &&
7978 (expression->base.kind != EXPR_BINARY_EQUAL &&
7979 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
7980 (is_type_signed(type_left) != is_type_signed(type_right))) {
7982 /* check if 1 of the operands is a constant, in this case we just
7983 * check wether we can safely represent the resulting constant in
7984 * the type of the other operand. */
7985 expression_t *const_expr = NULL;
7986 expression_t *other_expr = NULL;
7988 if (is_constant_expression(left)) {
7991 } else if (is_constant_expression(right)) {
7996 if (const_expr != NULL) {
7997 type_t *other_type = skip_typeref(other_expr->base.type);
7998 long val = fold_constant(const_expr);
7999 /* TODO: check if val can be represented by other_type */
8003 warningf(&expression->base.source_position,
8004 "comparison between signed and unsigned");
8006 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8007 expression->left = create_implicit_cast(left, arithmetic_type);
8008 expression->right = create_implicit_cast(right, arithmetic_type);
8009 expression->base.type = arithmetic_type;
8010 if (warning.float_equal &&
8011 (expression->base.kind == EXPR_BINARY_EQUAL ||
8012 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8013 is_type_float(arithmetic_type)) {
8014 warningf(&expression->base.source_position,
8015 "comparing floating point with == or != is unsafe");
8017 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8018 /* TODO check compatibility */
8019 } else if (is_type_pointer(type_left)) {
8020 expression->right = create_implicit_cast(right, type_left);
8021 } else if (is_type_pointer(type_right)) {
8022 expression->left = create_implicit_cast(left, type_right);
8023 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8024 type_error_incompatible("invalid operands in comparison",
8025 &expression->base.source_position,
8026 type_left, type_right);
8028 expression->base.type = type_int;
8032 * Checks if a compound type has constant fields.
8034 static bool has_const_fields(const compound_type_t *type)
8036 const scope_t *scope = &type->declaration->scope;
8037 const declaration_t *declaration = scope->declarations;
8039 for (; declaration != NULL; declaration = declaration->next) {
8040 if (declaration->namespc != NAMESPACE_NORMAL)
8043 const type_t *decl_type = skip_typeref(declaration->type);
8044 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8051 static bool is_valid_assignment_lhs(expression_t const* const left)
8053 type_t *const orig_type_left = revert_automatic_type_conversion(left);
8054 type_t *const type_left = skip_typeref(orig_type_left);
8056 if (!is_lvalue(left)) {
8057 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8062 if (is_type_array(type_left)) {
8063 errorf(HERE, "cannot assign to arrays ('%E')", left);
8066 if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8067 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8071 if (is_type_incomplete(type_left)) {
8072 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8073 left, orig_type_left);
8076 if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
8077 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
8078 left, orig_type_left);
8085 static void semantic_arithmetic_assign(binary_expression_t *expression)
8087 expression_t *left = expression->left;
8088 expression_t *right = expression->right;
8089 type_t *orig_type_left = left->base.type;
8090 type_t *orig_type_right = right->base.type;
8092 if (!is_valid_assignment_lhs(left))
8095 type_t *type_left = skip_typeref(orig_type_left);
8096 type_t *type_right = skip_typeref(orig_type_right);
8098 if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8099 /* TODO: improve error message */
8100 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8101 errorf(&expression->base.source_position,
8102 "operation needs arithmetic types");
8107 /* combined instructions are tricky. We can't create an implicit cast on
8108 * the left side, because we need the uncasted form for the store.
8109 * The ast2firm pass has to know that left_type must be right_type
8110 * for the arithmetic operation and create a cast by itself */
8111 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8112 expression->right = create_implicit_cast(right, arithmetic_type);
8113 expression->base.type = type_left;
8116 static void semantic_divmod_assign(binary_expression_t *expression)
8118 semantic_arithmetic_assign(expression);
8119 warn_div_by_zero(expression);
8122 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
8124 expression_t *const left = expression->left;
8125 expression_t *const right = expression->right;
8126 type_t *const orig_type_left = left->base.type;
8127 type_t *const orig_type_right = right->base.type;
8128 type_t *const type_left = skip_typeref(orig_type_left);
8129 type_t *const type_right = skip_typeref(orig_type_right);
8131 if (!is_valid_assignment_lhs(left))
8134 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8135 /* combined instructions are tricky. We can't create an implicit cast on
8136 * the left side, because we need the uncasted form for the store.
8137 * The ast2firm pass has to know that left_type must be right_type
8138 * for the arithmetic operation and create a cast by itself */
8139 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8140 expression->right = create_implicit_cast(right, arithmetic_type);
8141 expression->base.type = type_left;
8142 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8143 check_pointer_arithmetic(&expression->base.source_position,
8144 type_left, orig_type_left);
8145 expression->base.type = type_left;
8146 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8147 errorf(&expression->base.source_position,
8148 "incompatible types '%T' and '%T' in assignment",
8149 orig_type_left, orig_type_right);
8154 * Check the semantic restrictions of a logical expression.
8156 static void semantic_logical_op(binary_expression_t *expression)
8158 expression_t *const left = expression->left;
8159 expression_t *const right = expression->right;
8160 type_t *const orig_type_left = left->base.type;
8161 type_t *const orig_type_right = right->base.type;
8162 type_t *const type_left = skip_typeref(orig_type_left);
8163 type_t *const type_right = skip_typeref(orig_type_right);
8165 warn_function_address_as_bool(left);
8166 warn_function_address_as_bool(right);
8168 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
8169 /* TODO: improve error message */
8170 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8171 errorf(&expression->base.source_position,
8172 "operation needs scalar types");
8177 expression->base.type = type_int;
8181 * Check the semantic restrictions of a binary assign expression.
8183 static void semantic_binexpr_assign(binary_expression_t *expression)
8185 expression_t *left = expression->left;
8186 type_t *orig_type_left = left->base.type;
8188 if (!is_valid_assignment_lhs(left))
8191 assign_error_t error = semantic_assign(orig_type_left, expression->right);
8192 report_assign_error(error, orig_type_left, expression->right,
8193 "assignment", &left->base.source_position);
8194 expression->right = create_implicit_cast(expression->right, orig_type_left);
8195 expression->base.type = orig_type_left;
8199 * Determine if the outermost operation (or parts thereof) of the given
8200 * expression has no effect in order to generate a warning about this fact.
8201 * Therefore in some cases this only examines some of the operands of the
8202 * expression (see comments in the function and examples below).
8204 * f() + 23; // warning, because + has no effect
8205 * x || f(); // no warning, because x controls execution of f()
8206 * x ? y : f(); // warning, because y has no effect
8207 * (void)x; // no warning to be able to suppress the warning
8208 * This function can NOT be used for an "expression has definitely no effect"-
8210 static bool expression_has_effect(const expression_t *const expr)
8212 switch (expr->kind) {
8213 case EXPR_UNKNOWN: break;
8214 case EXPR_INVALID: return true; /* do NOT warn */
8215 case EXPR_REFERENCE: return false;
8216 /* suppress the warning for microsoft __noop operations */
8217 case EXPR_CONST: return expr->conste.is_ms_noop;
8218 case EXPR_CHARACTER_CONSTANT: return false;
8219 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
8220 case EXPR_STRING_LITERAL: return false;
8221 case EXPR_WIDE_STRING_LITERAL: return false;
8222 case EXPR_LABEL_ADDRESS: return false;
8225 const call_expression_t *const call = &expr->call;
8226 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
8229 switch (call->function->builtin_symbol.symbol->ID) {
8230 case T___builtin_va_end: return true;
8231 default: return false;
8235 /* Generate the warning if either the left or right hand side of a
8236 * conditional expression has no effect */
8237 case EXPR_CONDITIONAL: {
8238 const conditional_expression_t *const cond = &expr->conditional;
8240 expression_has_effect(cond->true_expression) &&
8241 expression_has_effect(cond->false_expression);
8244 case EXPR_SELECT: return false;
8245 case EXPR_ARRAY_ACCESS: return false;
8246 case EXPR_SIZEOF: return false;
8247 case EXPR_CLASSIFY_TYPE: return false;
8248 case EXPR_ALIGNOF: return false;
8250 case EXPR_FUNCNAME: return false;
8251 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
8252 case EXPR_BUILTIN_CONSTANT_P: return false;
8253 case EXPR_BUILTIN_PREFETCH: return true;
8254 case EXPR_OFFSETOF: return false;
8255 case EXPR_VA_START: return true;
8256 case EXPR_VA_ARG: return true;
8257 case EXPR_STATEMENT: return true; // TODO
8258 case EXPR_COMPOUND_LITERAL: return false;
8260 case EXPR_UNARY_NEGATE: return false;
8261 case EXPR_UNARY_PLUS: return false;
8262 case EXPR_UNARY_BITWISE_NEGATE: return false;
8263 case EXPR_UNARY_NOT: return false;
8264 case EXPR_UNARY_DEREFERENCE: return false;
8265 case EXPR_UNARY_TAKE_ADDRESS: return false;
8266 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
8267 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
8268 case EXPR_UNARY_PREFIX_INCREMENT: return true;
8269 case EXPR_UNARY_PREFIX_DECREMENT: return true;
8271 /* Treat void casts as if they have an effect in order to being able to
8272 * suppress the warning */
8273 case EXPR_UNARY_CAST: {
8274 type_t *const type = skip_typeref(expr->base.type);
8275 return is_type_atomic(type, ATOMIC_TYPE_VOID);
8278 case EXPR_UNARY_CAST_IMPLICIT: return true;
8279 case EXPR_UNARY_ASSUME: return true;
8281 case EXPR_BINARY_ADD: return false;
8282 case EXPR_BINARY_SUB: return false;
8283 case EXPR_BINARY_MUL: return false;
8284 case EXPR_BINARY_DIV: return false;
8285 case EXPR_BINARY_MOD: return false;
8286 case EXPR_BINARY_EQUAL: return false;
8287 case EXPR_BINARY_NOTEQUAL: return false;
8288 case EXPR_BINARY_LESS: return false;
8289 case EXPR_BINARY_LESSEQUAL: return false;
8290 case EXPR_BINARY_GREATER: return false;
8291 case EXPR_BINARY_GREATEREQUAL: return false;
8292 case EXPR_BINARY_BITWISE_AND: return false;
8293 case EXPR_BINARY_BITWISE_OR: return false;
8294 case EXPR_BINARY_BITWISE_XOR: return false;
8295 case EXPR_BINARY_SHIFTLEFT: return false;
8296 case EXPR_BINARY_SHIFTRIGHT: return false;
8297 case EXPR_BINARY_ASSIGN: return true;
8298 case EXPR_BINARY_MUL_ASSIGN: return true;
8299 case EXPR_BINARY_DIV_ASSIGN: return true;
8300 case EXPR_BINARY_MOD_ASSIGN: return true;
8301 case EXPR_BINARY_ADD_ASSIGN: return true;
8302 case EXPR_BINARY_SUB_ASSIGN: return true;
8303 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
8304 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
8305 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8306 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8307 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
8309 /* Only examine the right hand side of && and ||, because the left hand
8310 * side already has the effect of controlling the execution of the right
8312 case EXPR_BINARY_LOGICAL_AND:
8313 case EXPR_BINARY_LOGICAL_OR:
8314 /* Only examine the right hand side of a comma expression, because the left
8315 * hand side has a separate warning */
8316 case EXPR_BINARY_COMMA:
8317 return expression_has_effect(expr->binary.right);
8319 case EXPR_BINARY_BUILTIN_EXPECT: return true;
8320 case EXPR_BINARY_ISGREATER: return false;
8321 case EXPR_BINARY_ISGREATEREQUAL: return false;
8322 case EXPR_BINARY_ISLESS: return false;
8323 case EXPR_BINARY_ISLESSEQUAL: return false;
8324 case EXPR_BINARY_ISLESSGREATER: return false;
8325 case EXPR_BINARY_ISUNORDERED: return false;
8328 internal_errorf(HERE, "unexpected expression");
8331 static void semantic_comma(binary_expression_t *expression)
8333 if (warning.unused_value) {
8334 const expression_t *const left = expression->left;
8335 if (!expression_has_effect(left)) {
8336 warningf(&left->base.source_position,
8337 "left-hand operand of comma expression has no effect");
8340 expression->base.type = expression->right->base.type;
8343 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
8344 static expression_t *parse_##binexpression_type(unsigned precedence, \
8345 expression_t *left) \
8347 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8348 binexpr->base.source_position = *HERE; \
8349 binexpr->binary.left = left; \
8352 expression_t *right = parse_sub_expression(precedence + lr); \
8354 binexpr->binary.right = right; \
8355 sfunc(&binexpr->binary); \
8360 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
8361 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
8362 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_divmod_arithmetic, 1)
8363 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_divmod_arithmetic, 1)
8364 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
8365 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
8366 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
8367 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
8368 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
8370 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
8371 semantic_comparison, 1)
8372 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
8373 semantic_comparison, 1)
8374 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
8375 semantic_comparison, 1)
8376 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
8377 semantic_comparison, 1)
8379 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
8380 semantic_binexpr_arithmetic, 1)
8381 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
8382 semantic_binexpr_arithmetic, 1)
8383 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
8384 semantic_binexpr_arithmetic, 1)
8385 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
8386 semantic_logical_op, 1)
8387 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
8388 semantic_logical_op, 1)
8389 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
8390 semantic_shift_op, 1)
8391 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
8392 semantic_shift_op, 1)
8393 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
8394 semantic_arithmetic_addsubb_assign, 0)
8395 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
8396 semantic_arithmetic_addsubb_assign, 0)
8397 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
8398 semantic_arithmetic_assign, 0)
8399 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
8400 semantic_divmod_assign, 0)
8401 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
8402 semantic_divmod_assign, 0)
8403 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
8404 semantic_arithmetic_assign, 0)
8405 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8406 semantic_arithmetic_assign, 0)
8407 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
8408 semantic_arithmetic_assign, 0)
8409 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
8410 semantic_arithmetic_assign, 0)
8411 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
8412 semantic_arithmetic_assign, 0)
8414 static expression_t *parse_sub_expression(unsigned precedence)
8416 if (token.type < 0) {
8417 return expected_expression_error();
8420 expression_parser_function_t *parser
8421 = &expression_parsers[token.type];
8422 source_position_t source_position = token.source_position;
8425 if (parser->parser != NULL) {
8426 left = parser->parser(parser->precedence);
8428 left = parse_primary_expression();
8430 assert(left != NULL);
8431 left->base.source_position = source_position;
8434 if (token.type < 0) {
8435 return expected_expression_error();
8438 parser = &expression_parsers[token.type];
8439 if (parser->infix_parser == NULL)
8441 if (parser->infix_precedence < precedence)
8444 left = parser->infix_parser(parser->infix_precedence, left);
8446 assert(left != NULL);
8447 assert(left->kind != EXPR_UNKNOWN);
8448 left->base.source_position = source_position;
8455 * Parse an expression.
8457 static expression_t *parse_expression(void)
8459 return parse_sub_expression(1);
8463 * Register a parser for a prefix-like operator with given precedence.
8465 * @param parser the parser function
8466 * @param token_type the token type of the prefix token
8467 * @param precedence the precedence of the operator
8469 static void register_expression_parser(parse_expression_function parser,
8470 int token_type, unsigned precedence)
8472 expression_parser_function_t *entry = &expression_parsers[token_type];
8474 if (entry->parser != NULL) {
8475 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8476 panic("trying to register multiple expression parsers for a token");
8478 entry->parser = parser;
8479 entry->precedence = precedence;
8483 * Register a parser for an infix operator with given precedence.
8485 * @param parser the parser function
8486 * @param token_type the token type of the infix operator
8487 * @param precedence the precedence of the operator
8489 static void register_infix_parser(parse_expression_infix_function parser,
8490 int token_type, unsigned precedence)
8492 expression_parser_function_t *entry = &expression_parsers[token_type];
8494 if (entry->infix_parser != NULL) {
8495 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8496 panic("trying to register multiple infix expression parsers for a "
8499 entry->infix_parser = parser;
8500 entry->infix_precedence = precedence;
8504 * Initialize the expression parsers.
8506 static void init_expression_parsers(void)
8508 memset(&expression_parsers, 0, sizeof(expression_parsers));
8510 register_infix_parser(parse_array_expression, '[', 30);
8511 register_infix_parser(parse_call_expression, '(', 30);
8512 register_infix_parser(parse_select_expression, '.', 30);
8513 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
8514 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
8516 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
8519 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17);
8520 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17);
8521 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17);
8522 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16);
8523 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16);
8524 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15);
8525 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15);
8526 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
8527 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
8528 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
8529 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
8530 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
8531 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
8532 T_EXCLAMATIONMARKEQUAL, 13);
8533 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
8534 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
8535 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
8536 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
8537 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
8538 register_infix_parser(parse_conditional_expression, '?', 7);
8539 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
8540 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
8541 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
8542 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
8543 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
8544 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
8545 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
8546 T_LESSLESSEQUAL, 2);
8547 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8548 T_GREATERGREATEREQUAL, 2);
8549 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
8551 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
8553 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
8556 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
8558 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
8559 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
8560 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
8561 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
8562 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
8563 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
8564 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
8566 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
8568 register_expression_parser(parse_sizeof, T_sizeof, 25);
8569 register_expression_parser(parse_alignof, T___alignof__, 25);
8570 register_expression_parser(parse_extension, T___extension__, 25);
8571 register_expression_parser(parse_builtin_classify_type,
8572 T___builtin_classify_type, 25);
8576 * Parse a asm statement arguments specification.
8578 static asm_argument_t *parse_asm_arguments(bool is_out)
8580 asm_argument_t *result = NULL;
8581 asm_argument_t *last = NULL;
8583 while (token.type == T_STRING_LITERAL || token.type == '[') {
8584 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8585 memset(argument, 0, sizeof(argument[0]));
8587 if (token.type == '[') {
8589 if (token.type != T_IDENTIFIER) {
8590 parse_error_expected("while parsing asm argument",
8591 T_IDENTIFIER, NULL);
8594 argument->symbol = token.v.symbol;
8599 argument->constraints = parse_string_literals();
8601 add_anchor_token(')');
8602 expression_t *expression = parse_expression();
8603 rem_anchor_token(')');
8605 /* Ugly GCC stuff: Allow lvalue casts. Skip casts, when they do not
8606 * change size or type representation (e.g. int -> long is ok, but
8607 * int -> float is not) */
8608 if (expression->kind == EXPR_UNARY_CAST) {
8609 type_t *const type = expression->base.type;
8610 type_kind_t const kind = type->kind;
8611 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8614 if (kind == TYPE_ATOMIC) {
8615 atomic_type_kind_t const akind = type->atomic.akind;
8616 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8617 size = get_atomic_type_size(akind);
8619 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8620 size = get_atomic_type_size(get_intptr_kind());
8624 expression_t *const value = expression->unary.value;
8625 type_t *const value_type = value->base.type;
8626 type_kind_t const value_kind = value_type->kind;
8628 unsigned value_flags;
8629 unsigned value_size;
8630 if (value_kind == TYPE_ATOMIC) {
8631 atomic_type_kind_t const value_akind = value_type->atomic.akind;
8632 value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8633 value_size = get_atomic_type_size(value_akind);
8634 } else if (value_kind == TYPE_POINTER) {
8635 value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8636 value_size = get_atomic_type_size(get_intptr_kind());
8641 if (value_flags != flags || value_size != size)
8645 } while (expression->kind == EXPR_UNARY_CAST);
8649 if (!is_lvalue(expression)) {
8650 errorf(&expression->base.source_position,
8651 "asm output argument is not an lvalue");
8654 argument->expression = expression;
8657 set_address_taken(expression, true);
8660 last->next = argument;
8666 if (token.type != ',')
8677 * Parse a asm statement clobber specification.
8679 static asm_clobber_t *parse_asm_clobbers(void)
8681 asm_clobber_t *result = NULL;
8682 asm_clobber_t *last = NULL;
8684 while(token.type == T_STRING_LITERAL) {
8685 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
8686 clobber->clobber = parse_string_literals();
8689 last->next = clobber;
8695 if (token.type != ',')
8704 * Parse an asm statement.
8706 static statement_t *parse_asm_statement(void)
8708 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
8709 asm_statement_t *asm_statement = &statement->asms;
8713 if (token.type == T_volatile) {
8715 asm_statement->is_volatile = true;
8719 add_anchor_token(')');
8720 add_anchor_token(':');
8721 asm_statement->asm_text = parse_string_literals();
8723 if (token.type != ':') {
8724 rem_anchor_token(':');
8729 asm_statement->outputs = parse_asm_arguments(true);
8730 if (token.type != ':') {
8731 rem_anchor_token(':');
8736 asm_statement->inputs = parse_asm_arguments(false);
8737 if (token.type != ':') {
8738 rem_anchor_token(':');
8741 rem_anchor_token(':');
8744 asm_statement->clobbers = parse_asm_clobbers();
8747 rem_anchor_token(')');
8751 if (asm_statement->outputs == NULL) {
8752 /* GCC: An 'asm' instruction without any output operands will be treated
8753 * identically to a volatile 'asm' instruction. */
8754 asm_statement->is_volatile = true;
8759 return create_invalid_statement();
8763 * Parse a case statement.
8765 static statement_t *parse_case_statement(void)
8767 statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8768 source_position_t *const pos = &statement->base.source_position;
8772 expression_t *const expression = parse_expression();
8773 statement->case_label.expression = expression;
8774 if (!is_constant_expression(expression)) {
8775 /* This check does not prevent the error message in all cases of an
8776 * prior error while parsing the expression. At least it catches the
8777 * common case of a mistyped enum entry. */
8778 if (is_type_valid(expression->base.type)) {
8779 errorf(pos, "case label does not reduce to an integer constant");
8781 statement->case_label.is_bad = true;
8783 long const val = fold_constant(expression);
8784 statement->case_label.first_case = val;
8785 statement->case_label.last_case = val;
8789 if (token.type == T_DOTDOTDOT) {
8791 expression_t *const end_range = parse_expression();
8792 statement->case_label.end_range = end_range;
8793 if (!is_constant_expression(end_range)) {
8794 /* This check does not prevent the error message in all cases of an
8795 * prior error while parsing the expression. At least it catches the
8796 * common case of a mistyped enum entry. */
8797 if (is_type_valid(end_range->base.type)) {
8798 errorf(pos, "case range does not reduce to an integer constant");
8800 statement->case_label.is_bad = true;
8802 long const val = fold_constant(end_range);
8803 statement->case_label.last_case = val;
8805 if (val < statement->case_label.first_case) {
8806 statement->case_label.is_empty_range = true;
8807 warningf(pos, "empty range specified");
8813 PUSH_PARENT(statement);
8817 if (current_switch != NULL) {
8818 if (! statement->case_label.is_bad) {
8819 /* Check for duplicate case values */
8820 case_label_statement_t *c = &statement->case_label;
8821 for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
8822 if (l->is_bad || l->is_empty_range || l->expression == NULL)
8825 if (c->last_case < l->first_case || c->first_case > l->last_case)
8828 errorf(pos, "duplicate case value (previously used %P)",
8829 &l->base.source_position);
8833 /* link all cases into the switch statement */
8834 if (current_switch->last_case == NULL) {
8835 current_switch->first_case = &statement->case_label;
8837 current_switch->last_case->next = &statement->case_label;
8839 current_switch->last_case = &statement->case_label;
8841 errorf(pos, "case label not within a switch statement");
8844 statement_t *const inner_stmt = parse_statement();
8845 statement->case_label.statement = inner_stmt;
8846 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8847 errorf(&inner_stmt->base.source_position, "declaration after case label");
8854 return create_invalid_statement();
8858 * Parse a default statement.
8860 static statement_t *parse_default_statement(void)
8862 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8866 PUSH_PARENT(statement);
8869 if (current_switch != NULL) {
8870 const case_label_statement_t *def_label = current_switch->default_label;
8871 if (def_label != NULL) {
8872 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
8873 &def_label->base.source_position);
8875 current_switch->default_label = &statement->case_label;
8877 /* link all cases into the switch statement */
8878 if (current_switch->last_case == NULL) {
8879 current_switch->first_case = &statement->case_label;
8881 current_switch->last_case->next = &statement->case_label;
8883 current_switch->last_case = &statement->case_label;
8886 errorf(&statement->base.source_position,
8887 "'default' label not within a switch statement");
8890 statement_t *const inner_stmt = parse_statement();
8891 statement->case_label.statement = inner_stmt;
8892 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8893 errorf(&inner_stmt->base.source_position, "declaration after default label");
8900 return create_invalid_statement();
8904 * Parse a label statement.
8906 static statement_t *parse_label_statement(void)
8908 assert(token.type == T_IDENTIFIER);
8909 symbol_t *symbol = token.v.symbol;
8910 declaration_t *label = get_label(symbol);
8912 statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
8913 statement->label.label = label;
8917 PUSH_PARENT(statement);
8919 /* if statement is already set then the label is defined twice,
8920 * otherwise it was just mentioned in a goto/local label declaration so far */
8921 if (label->init.statement != NULL) {
8922 errorf(HERE, "duplicate label '%Y' (declared %P)",
8923 symbol, &label->source_position);
8925 label->source_position = token.source_position;
8926 label->init.statement = statement;
8931 if (token.type == '}') {
8932 /* TODO only warn? */
8934 warningf(HERE, "label at end of compound statement");
8935 statement->label.statement = create_empty_statement();
8937 errorf(HERE, "label at end of compound statement");
8938 statement->label.statement = create_invalid_statement();
8940 } else if (token.type == ';') {
8941 /* Eat an empty statement here, to avoid the warning about an empty
8942 * statement after a label. label:; is commonly used to have a label
8943 * before a closing brace. */
8944 statement->label.statement = create_empty_statement();
8947 statement_t *const inner_stmt = parse_statement();
8948 statement->label.statement = inner_stmt;
8949 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8950 errorf(&inner_stmt->base.source_position, "declaration after label");
8954 /* remember the labels in a list for later checking */
8955 if (label_last == NULL) {
8956 label_first = &statement->label;
8958 label_last->next = &statement->label;
8960 label_last = &statement->label;
8967 * Parse an if statement.
8969 static statement_t *parse_if(void)
8971 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
8975 PUSH_PARENT(statement);
8978 add_anchor_token(')');
8979 statement->ifs.condition = parse_expression();
8980 rem_anchor_token(')');
8983 add_anchor_token(T_else);
8984 statement->ifs.true_statement = parse_statement();
8985 rem_anchor_token(T_else);
8987 if (token.type == T_else) {
8989 statement->ifs.false_statement = parse_statement();
8996 return create_invalid_statement();
9000 * Check that all enums are handled in a switch.
9002 * @param statement the switch statement to check
9004 static void check_enum_cases(const switch_statement_t *statement) {
9005 const type_t *type = skip_typeref(statement->expression->base.type);
9006 if (! is_type_enum(type))
9008 const enum_type_t *enumt = &type->enumt;
9010 /* if we have a default, no warnings */
9011 if (statement->default_label != NULL)
9014 /* FIXME: calculation of value should be done while parsing */
9015 const declaration_t *declaration;
9016 long last_value = -1;
9017 for (declaration = enumt->declaration->next;
9018 declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY;
9019 declaration = declaration->next) {
9020 const expression_t *expression = declaration->init.enum_value;
9021 long value = expression != NULL ? fold_constant(expression) : last_value + 1;
9023 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9024 if (l->expression == NULL)
9026 if (l->first_case <= value && value <= l->last_case) {
9032 warningf(&statement->base.source_position,
9033 "enumeration value '%Y' not handled in switch", declaration->symbol);
9040 * Parse a switch statement.
9042 static statement_t *parse_switch(void)
9044 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9048 PUSH_PARENT(statement);
9051 add_anchor_token(')');
9052 expression_t *const expr = parse_expression();
9053 type_t * type = skip_typeref(expr->base.type);
9054 if (is_type_integer(type)) {
9055 type = promote_integer(type);
9056 if (warning.traditional) {
9057 if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9058 warningf(&expr->base.source_position,
9059 "'%T' switch expression not converted to '%T' in ISO C",
9063 } else if (is_type_valid(type)) {
9064 errorf(&expr->base.source_position,
9065 "switch quantity is not an integer, but '%T'", type);
9066 type = type_error_type;
9068 statement->switchs.expression = create_implicit_cast(expr, type);
9070 rem_anchor_token(')');
9072 switch_statement_t *rem = current_switch;
9073 current_switch = &statement->switchs;
9074 statement->switchs.body = parse_statement();
9075 current_switch = rem;
9077 if (warning.switch_default &&
9078 statement->switchs.default_label == NULL) {
9079 warningf(&statement->base.source_position, "switch has no default case");
9081 if (warning.switch_enum)
9082 check_enum_cases(&statement->switchs);
9088 return create_invalid_statement();
9091 static statement_t *parse_loop_body(statement_t *const loop)
9093 statement_t *const rem = current_loop;
9094 current_loop = loop;
9096 statement_t *const body = parse_statement();
9103 * Parse a while statement.
9105 static statement_t *parse_while(void)
9107 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9111 PUSH_PARENT(statement);
9114 add_anchor_token(')');
9115 statement->whiles.condition = parse_expression();
9116 rem_anchor_token(')');
9119 statement->whiles.body = parse_loop_body(statement);
9125 return create_invalid_statement();
9129 * Parse a do statement.
9131 static statement_t *parse_do(void)
9133 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9137 PUSH_PARENT(statement)
9139 add_anchor_token(T_while);
9140 statement->do_while.body = parse_loop_body(statement);
9141 rem_anchor_token(T_while);
9145 add_anchor_token(')');
9146 statement->do_while.condition = parse_expression();
9147 rem_anchor_token(')');
9155 return create_invalid_statement();
9159 * Parse a for statement.
9161 static statement_t *parse_for(void)
9163 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9167 PUSH_PARENT(statement);
9169 size_t const top = environment_top();
9170 scope_push(&statement->fors.scope);
9173 add_anchor_token(')');
9175 if (token.type != ';') {
9176 if (is_declaration_specifier(&token, false)) {
9177 parse_declaration(record_declaration);
9179 add_anchor_token(';');
9180 expression_t *const init = parse_expression();
9181 statement->fors.initialisation = init;
9182 if (warning.unused_value && !expression_has_effect(init)) {
9183 warningf(&init->base.source_position,
9184 "initialisation of 'for'-statement has no effect");
9186 rem_anchor_token(';');
9193 if (token.type != ';') {
9194 add_anchor_token(';');
9195 statement->fors.condition = parse_expression();
9196 rem_anchor_token(';');
9199 if (token.type != ')') {
9200 expression_t *const step = parse_expression();
9201 statement->fors.step = step;
9202 if (warning.unused_value && !expression_has_effect(step)) {
9203 warningf(&step->base.source_position,
9204 "step of 'for'-statement has no effect");
9207 rem_anchor_token(')');
9209 statement->fors.body = parse_loop_body(statement);
9211 assert(scope == &statement->fors.scope);
9213 environment_pop_to(top);
9220 rem_anchor_token(')');
9221 assert(scope == &statement->fors.scope);
9223 environment_pop_to(top);
9225 return create_invalid_statement();
9229 * Parse a goto statement.
9231 static statement_t *parse_goto(void)
9233 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
9236 if (GNU_MODE && token.type == '*') {
9238 expression_t *expression = parse_expression();
9240 /* Argh: although documentation say the expression must be of type void *,
9241 * gcc excepts anything that can be casted into void * without error */
9242 type_t *type = expression->base.type;
9244 if (type != type_error_type) {
9245 if (!is_type_pointer(type) && !is_type_integer(type)) {
9246 errorf(&expression->base.source_position,
9247 "cannot convert to a pointer type");
9248 } else if (type != type_void_ptr) {
9249 warningf(&expression->base.source_position,
9250 "type of computed goto expression should be 'void*' not '%T'", type);
9252 expression = create_implicit_cast(expression, type_void_ptr);
9255 statement->gotos.expression = expression;
9257 if (token.type != T_IDENTIFIER) {
9259 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9261 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9265 symbol_t *symbol = token.v.symbol;
9268 statement->gotos.label = get_label(symbol);
9270 if (statement->gotos.label->parent_scope->depth < current_function->scope.depth) {
9271 statement->gotos.outer_fkt_jmp = true;
9275 /* remember the goto's in a list for later checking */
9276 if (goto_last == NULL) {
9277 goto_first = &statement->gotos;
9279 goto_last->next = &statement->gotos;
9281 goto_last = &statement->gotos;
9287 return create_invalid_statement();
9291 * Parse a continue statement.
9293 static statement_t *parse_continue(void)
9295 if (current_loop == NULL) {
9296 errorf(HERE, "continue statement not within loop");
9299 statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9309 * Parse a break statement.
9311 static statement_t *parse_break(void)
9313 if (current_switch == NULL && current_loop == NULL) {
9314 errorf(HERE, "break statement not within loop or switch");
9317 statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9327 * Parse a __leave statement.
9329 static statement_t *parse_leave_statement(void)
9331 if (current_try == NULL) {
9332 errorf(HERE, "__leave statement not within __try");
9335 statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9345 * Check if a given declaration represents a local variable.
9347 static bool is_local_var_declaration(const declaration_t *declaration)
9349 switch ((storage_class_tag_t) declaration->storage_class) {
9350 case STORAGE_CLASS_AUTO:
9351 case STORAGE_CLASS_REGISTER: {
9352 const type_t *type = skip_typeref(declaration->type);
9353 if (is_type_function(type)) {
9365 * Check if a given declaration represents a variable.
9367 static bool is_var_declaration(const declaration_t *declaration)
9369 if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
9372 const type_t *type = skip_typeref(declaration->type);
9373 return !is_type_function(type);
9377 * Check if a given expression represents a local variable.
9379 static bool is_local_variable(const expression_t *expression)
9381 if (expression->base.kind != EXPR_REFERENCE) {
9384 const declaration_t *declaration = expression->reference.declaration;
9385 return is_local_var_declaration(declaration);
9389 * Check if a given expression represents a local variable and
9390 * return its declaration then, else return NULL.
9392 declaration_t *expr_is_variable(const expression_t *expression)
9394 if (expression->base.kind != EXPR_REFERENCE) {
9397 declaration_t *declaration = expression->reference.declaration;
9398 if (is_var_declaration(declaration))
9404 * Parse a return statement.
9406 static statement_t *parse_return(void)
9410 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9412 expression_t *return_value = NULL;
9413 if (token.type != ';') {
9414 return_value = parse_expression();
9417 const type_t *const func_type = current_function->type;
9418 assert(is_type_function(func_type));
9419 type_t *const return_type = skip_typeref(func_type->function.return_type);
9421 if (return_value != NULL) {
9422 type_t *return_value_type = skip_typeref(return_value->base.type);
9424 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
9425 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9426 warningf(&statement->base.source_position,
9427 "'return' with a value, in function returning void");
9428 return_value = NULL;
9430 assign_error_t error = semantic_assign(return_type, return_value);
9431 report_assign_error(error, return_type, return_value, "'return'",
9432 &statement->base.source_position);
9433 return_value = create_implicit_cast(return_value, return_type);
9435 /* check for returning address of a local var */
9436 if (return_value != NULL &&
9437 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9438 const expression_t *expression = return_value->unary.value;
9439 if (is_local_variable(expression)) {
9440 warningf(&statement->base.source_position,
9441 "function returns address of local variable");
9445 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9446 warningf(&statement->base.source_position,
9447 "'return' without value, in function returning non-void");
9450 statement->returns.value = return_value;
9459 * Parse a declaration statement.
9461 static statement_t *parse_declaration_statement(void)
9463 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9465 declaration_t *before = last_declaration;
9467 parse_external_declaration();
9469 parse_declaration(record_declaration);
9471 if (before == NULL) {
9472 statement->declaration.declarations_begin = scope->declarations;
9474 statement->declaration.declarations_begin = before->next;
9476 statement->declaration.declarations_end = last_declaration;
9482 * Parse an expression statement, ie. expr ';'.
9484 static statement_t *parse_expression_statement(void)
9486 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9488 expression_t *const expr = parse_expression();
9489 statement->expression.expression = expr;
9498 * Parse a microsoft __try { } __finally { } or
9499 * __try{ } __except() { }
9501 static statement_t *parse_ms_try_statment(void)
9503 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9506 PUSH_PARENT(statement);
9508 ms_try_statement_t *rem = current_try;
9509 current_try = &statement->ms_try;
9510 statement->ms_try.try_statement = parse_compound_statement(false);
9515 if (token.type == T___except) {
9518 add_anchor_token(')');
9519 expression_t *const expr = parse_expression();
9520 type_t * type = skip_typeref(expr->base.type);
9521 if (is_type_integer(type)) {
9522 type = promote_integer(type);
9523 } else if (is_type_valid(type)) {
9524 errorf(&expr->base.source_position,
9525 "__expect expression is not an integer, but '%T'", type);
9526 type = type_error_type;
9528 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9529 rem_anchor_token(')');
9531 statement->ms_try.final_statement = parse_compound_statement(false);
9532 } else if (token.type == T__finally) {
9534 statement->ms_try.final_statement = parse_compound_statement(false);
9536 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9537 return create_invalid_statement();
9541 return create_invalid_statement();
9544 static statement_t *parse_empty_statement(void)
9546 if (warning.empty_statement) {
9547 warningf(HERE, "statement is empty");
9549 statement_t *const statement = create_empty_statement();
9554 static statement_t *parse_local_label_declaration(void) {
9555 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9559 declaration_t *begin = NULL, *end = NULL;
9562 if (token.type != T_IDENTIFIER) {
9563 parse_error_expected("while parsing local label declaration",
9564 T_IDENTIFIER, NULL);
9567 symbol_t *symbol = token.v.symbol;
9568 declaration_t *declaration = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
9569 if (declaration != NULL) {
9570 errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition at %P)",
9571 symbol, &declaration->source_position);
9573 declaration = allocate_declaration_zero();
9574 declaration->namespc = NAMESPACE_LOCAL_LABEL;
9575 declaration->source_position = token.source_position;
9576 declaration->symbol = symbol;
9577 declaration->parent_scope = scope;
9578 declaration->init.statement = NULL;
9581 end->next = declaration;
9584 begin = declaration;
9586 local_label_push(declaration);
9590 if (token.type != ',')
9596 statement->declaration.declarations_begin = begin;
9597 statement->declaration.declarations_end = end;
9602 * Parse a statement.
9603 * There's also parse_statement() which additionally checks for
9604 * "statement has no effect" warnings
9606 static statement_t *intern_parse_statement(void)
9608 statement_t *statement = NULL;
9610 /* declaration or statement */
9611 add_anchor_token(';');
9612 switch (token.type) {
9613 case T_IDENTIFIER: {
9614 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9615 if (la1_type == ':') {
9616 statement = parse_label_statement();
9617 } else if (is_typedef_symbol(token.v.symbol)) {
9618 statement = parse_declaration_statement();
9619 } else switch (la1_type) {
9621 if (get_declaration(token.v.symbol, NAMESPACE_NORMAL) != NULL)
9622 goto expression_statment;
9627 statement = parse_declaration_statement();
9631 expression_statment:
9632 statement = parse_expression_statement();
9638 case T___extension__:
9639 /* This can be a prefix to a declaration or an expression statement.
9640 * We simply eat it now and parse the rest with tail recursion. */
9643 } while (token.type == T___extension__);
9644 bool old_gcc_extension = in_gcc_extension;
9645 in_gcc_extension = true;
9646 statement = parse_statement();
9647 in_gcc_extension = old_gcc_extension;
9651 statement = parse_declaration_statement();
9655 statement = parse_local_label_declaration();
9658 case ';': statement = parse_empty_statement(); break;
9659 case '{': statement = parse_compound_statement(false); break;
9660 case T___leave: statement = parse_leave_statement(); break;
9661 case T___try: statement = parse_ms_try_statment(); break;
9662 case T_asm: statement = parse_asm_statement(); break;
9663 case T_break: statement = parse_break(); break;
9664 case T_case: statement = parse_case_statement(); break;
9665 case T_continue: statement = parse_continue(); break;
9666 case T_default: statement = parse_default_statement(); break;
9667 case T_do: statement = parse_do(); break;
9668 case T_for: statement = parse_for(); break;
9669 case T_goto: statement = parse_goto(); break;
9670 case T_if: statement = parse_if (); break;
9671 case T_return: statement = parse_return(); break;
9672 case T_switch: statement = parse_switch(); break;
9673 case T_while: statement = parse_while(); break;
9683 case T_CHARACTER_CONSTANT:
9684 case T_FLOATINGPOINT:
9688 case T_STRING_LITERAL:
9689 case T_WIDE_CHARACTER_CONSTANT:
9690 case T_WIDE_STRING_LITERAL:
9691 case T___FUNCDNAME__:
9693 case T___FUNCTION__:
9694 case T___PRETTY_FUNCTION__:
9695 case T___builtin_alloca:
9696 case T___builtin_classify_type:
9697 case T___builtin_constant_p:
9698 case T___builtin_expect:
9699 case T___builtin_huge_val:
9700 case T___builtin_isgreater:
9701 case T___builtin_isgreaterequal:
9702 case T___builtin_isless:
9703 case T___builtin_islessequal:
9704 case T___builtin_islessgreater:
9705 case T___builtin_isunordered:
9706 case T___builtin_nan:
9707 case T___builtin_nand:
9708 case T___builtin_nanf:
9709 case T___builtin_offsetof:
9710 case T___builtin_prefetch:
9711 case T___builtin_va_arg:
9712 case T___builtin_va_end:
9713 case T___builtin_va_start:
9717 statement = parse_expression_statement();
9721 errorf(HERE, "unexpected token %K while parsing statement", &token);
9722 statement = create_invalid_statement();
9727 rem_anchor_token(';');
9729 assert(statement != NULL
9730 && statement->base.source_position.input_name != NULL);
9736 * parse a statement and emits "statement has no effect" warning if needed
9737 * (This is really a wrapper around intern_parse_statement with check for 1
9738 * single warning. It is needed, because for statement expressions we have
9739 * to avoid the warning on the last statement)
9741 static statement_t *parse_statement(void)
9743 statement_t *statement = intern_parse_statement();
9745 if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
9746 expression_t *expression = statement->expression.expression;
9747 if (!expression_has_effect(expression)) {
9748 warningf(&expression->base.source_position,
9749 "statement has no effect");
9757 * Parse a compound statement.
9759 static statement_t *parse_compound_statement(bool inside_expression_statement)
9761 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
9763 PUSH_PARENT(statement);
9766 add_anchor_token('}');
9768 size_t const top = environment_top();
9769 size_t const top_local = local_label_top();
9770 scope_push(&statement->compound.scope);
9772 statement_t **anchor = &statement->compound.statements;
9773 bool only_decls_so_far = true;
9774 while (token.type != '}') {
9775 if (token.type == T_EOF) {
9776 errorf(&statement->base.source_position,
9777 "EOF while parsing compound statement");
9780 statement_t *sub_statement = intern_parse_statement();
9781 if (is_invalid_statement(sub_statement)) {
9782 /* an error occurred. if we are at an anchor, return */
9788 if (warning.declaration_after_statement) {
9789 if (sub_statement->kind != STATEMENT_DECLARATION) {
9790 only_decls_so_far = false;
9791 } else if (!only_decls_so_far) {
9792 warningf(&sub_statement->base.source_position,
9793 "ISO C90 forbids mixed declarations and code");
9797 *anchor = sub_statement;
9799 while (sub_statement->base.next != NULL)
9800 sub_statement = sub_statement->base.next;
9802 anchor = &sub_statement->base.next;
9806 /* look over all statements again to produce no effect warnings */
9807 if (warning.unused_value) {
9808 statement_t *sub_statement = statement->compound.statements;
9809 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
9810 if (sub_statement->kind != STATEMENT_EXPRESSION)
9812 /* don't emit a warning for the last expression in an expression
9813 * statement as it has always an effect */
9814 if (inside_expression_statement && sub_statement->base.next == NULL)
9817 expression_t *expression = sub_statement->expression.expression;
9818 if (!expression_has_effect(expression)) {
9819 warningf(&expression->base.source_position,
9820 "statement has no effect");
9826 rem_anchor_token('}');
9827 assert(scope == &statement->compound.scope);
9829 environment_pop_to(top);
9830 local_label_pop_to(top_local);
9837 * Initialize builtin types.
9839 static void initialize_builtin_types(void)
9841 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
9842 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
9843 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
9844 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
9845 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
9846 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
9847 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", opt_short_wchar_t ? type_unsigned_short : type_int);
9848 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
9850 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
9851 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
9852 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
9853 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
9855 /* const version of wchar_t */
9856 type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
9857 type_const_wchar_t->typedeft.declaration = type_wchar_t->typedeft.declaration;
9858 type_const_wchar_t->base.qualifiers |= TYPE_QUALIFIER_CONST;
9860 type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE);
9864 * Check for unused global static functions and variables
9866 static void check_unused_globals(void)
9868 if (!warning.unused_function && !warning.unused_variable)
9871 for (const declaration_t *decl = file_scope->declarations; decl != NULL; decl = decl->next) {
9873 decl->modifiers & DM_UNUSED ||
9874 decl->modifiers & DM_USED ||
9875 decl->storage_class != STORAGE_CLASS_STATIC)
9878 type_t *const type = decl->type;
9880 if (is_type_function(skip_typeref(type))) {
9881 if (!warning.unused_function || decl->is_inline)
9884 s = (decl->init.statement != NULL ? "defined" : "declared");
9886 if (!warning.unused_variable)
9892 warningf(&decl->source_position, "'%#T' %s but not used",
9893 type, decl->symbol, s);
9897 static void parse_global_asm(void)
9899 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9904 statement->asms.asm_text = parse_string_literals();
9905 statement->base.next = unit->global_asm;
9906 unit->global_asm = statement;
9915 * Parse a translation unit.
9917 static void parse_translation_unit(void)
9919 add_anchor_token(T_EOF);
9922 unsigned char token_anchor_copy[T_LAST_TOKEN];
9923 memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
9927 bool anchor_leak = false;
9928 for (int i = 0; i != T_LAST_TOKEN; ++i) {
9929 unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
9931 errorf(HERE, "Leaked anchor token %k %d times", i, count);
9935 if (in_gcc_extension) {
9936 errorf(HERE, "Leaked __extension__");
9944 switch (token.type) {
9947 case T___extension__:
9948 parse_external_declaration();
9956 rem_anchor_token(T_EOF);
9961 warningf(HERE, "stray ';' outside of function");
9968 errorf(HERE, "stray %K outside of function", &token);
9969 if (token.type == '(' || token.type == '{' || token.type == '[')
9970 eat_until_matching_token(token.type);
9980 * @return the translation unit or NULL if errors occurred.
9982 void start_parsing(void)
9984 environment_stack = NEW_ARR_F(stack_entry_t, 0);
9985 label_stack = NEW_ARR_F(stack_entry_t, 0);
9986 local_label_stack = NEW_ARR_F(stack_entry_t, 0);
9987 diagnostic_count = 0;
9991 type_set_output(stderr);
9992 ast_set_output(stderr);
9994 assert(unit == NULL);
9995 unit = allocate_ast_zero(sizeof(unit[0]));
9997 assert(file_scope == NULL);
9998 file_scope = &unit->scope;
10000 assert(scope == NULL);
10001 scope_push(&unit->scope);
10003 initialize_builtin_types();
10006 translation_unit_t *finish_parsing(void)
10008 /* do NOT use scope_pop() here, this will crash, will it by hand */
10009 assert(scope == &unit->scope);
10011 last_declaration = NULL;
10013 assert(file_scope == &unit->scope);
10014 check_unused_globals();
10017 DEL_ARR_F(environment_stack);
10018 DEL_ARR_F(label_stack);
10019 DEL_ARR_F(local_label_stack);
10021 translation_unit_t *result = unit;
10028 lookahead_bufpos = 0;
10029 for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10032 parse_translation_unit();
10036 * Initialize the parser.
10038 void init_parser(void)
10040 sym_anonymous = symbol_table_insert("<anonymous>");
10042 if (c_mode & _MS) {
10043 /* add predefined symbols for extended-decl-modifier */
10044 sym_align = symbol_table_insert("align");
10045 sym_allocate = symbol_table_insert("allocate");
10046 sym_dllimport = symbol_table_insert("dllimport");
10047 sym_dllexport = symbol_table_insert("dllexport");
10048 sym_naked = symbol_table_insert("naked");
10049 sym_noinline = symbol_table_insert("noinline");
10050 sym_noreturn = symbol_table_insert("noreturn");
10051 sym_nothrow = symbol_table_insert("nothrow");
10052 sym_novtable = symbol_table_insert("novtable");
10053 sym_property = symbol_table_insert("property");
10054 sym_get = symbol_table_insert("get");
10055 sym_put = symbol_table_insert("put");
10056 sym_selectany = symbol_table_insert("selectany");
10057 sym_thread = symbol_table_insert("thread");
10058 sym_uuid = symbol_table_insert("uuid");
10059 sym_deprecated = symbol_table_insert("deprecated");
10060 sym_restrict = symbol_table_insert("restrict");
10061 sym_noalias = symbol_table_insert("noalias");
10063 memset(token_anchor_set, 0, sizeof(token_anchor_set));
10065 init_expression_parsers();
10066 obstack_init(&temp_obst);
10068 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
10069 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
10073 * Terminate the parser.
10075 void exit_parser(void)
10077 obstack_free(&temp_obst, NULL);