7 #include "diagnostic.h"
8 #include "format_check.h"
14 #include "type_hash.h"
16 #include "lang_features.h"
17 #include "adt/bitfiddle.h"
18 #include "adt/error.h"
19 #include "adt/array.h"
21 //#define PRINT_TOKENS
22 //#define ABORT_ON_ERROR
23 #define MAX_LOOKAHEAD 2
26 declaration_t *old_declaration;
28 unsigned short namespc;
31 typedef struct declaration_specifiers_t declaration_specifiers_t;
32 struct declaration_specifiers_t {
33 source_position_t source_position;
34 unsigned char storage_class;
36 decl_modifiers_t decl_modifiers;
40 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
43 static token_t lookahead_buffer[MAX_LOOKAHEAD];
44 static int lookahead_bufpos;
45 static stack_entry_t *environment_stack = NULL;
46 static stack_entry_t *label_stack = NULL;
47 static context_t *global_context = NULL;
48 static context_t *context = NULL;
49 static declaration_t *last_declaration = NULL;
50 static declaration_t *current_function = NULL;
51 static switch_statement_t *current_switch = NULL;
52 static statement_t *current_loop = NULL;
53 static goto_statement_t *goto_first = NULL;
54 static goto_statement_t *goto_last = NULL;
55 static struct obstack temp_obst;
57 /** The current source position. */
58 #define HERE token.source_position
60 static type_t *type_valist;
62 static statement_t *parse_compound_statement(void);
63 static statement_t *parse_statement(void);
65 static expression_t *parse_sub_expression(unsigned precedence);
66 static expression_t *parse_expression(void);
67 static type_t *parse_typename(void);
69 static void parse_compound_type_entries(void);
70 static declaration_t *parse_declarator(
71 const declaration_specifiers_t *specifiers, bool may_be_abstract);
72 static declaration_t *record_declaration(declaration_t *declaration);
74 static void semantic_comparison(binary_expression_t *expression);
76 #define STORAGE_CLASSES \
83 #define TYPE_QUALIFIERS \
90 #ifdef PROVIDE_COMPLEX
91 #define COMPLEX_SPECIFIERS \
93 #define IMAGINARY_SPECIFIERS \
96 #define COMPLEX_SPECIFIERS
97 #define IMAGINARY_SPECIFIERS
100 #define TYPE_SPECIFIERS \
115 case T___builtin_va_list: \
119 #define DECLARATION_START \
124 #define TYPENAME_START \
129 * Allocate an AST node with given size and
130 * initialize all fields with zero.
132 static void *allocate_ast_zero(size_t size)
134 void *res = allocate_ast(size);
135 memset(res, 0, size);
140 * Returns the size of a statement node.
142 * @param kind the statement kind
144 static size_t get_statement_struct_size(statement_kind_t kind)
146 static const size_t sizes[] = {
147 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
148 [STATEMENT_RETURN] = sizeof(return_statement_t),
149 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
150 [STATEMENT_IF] = sizeof(if_statement_t),
151 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
152 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
153 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
154 [STATEMENT_BREAK] = sizeof(statement_base_t),
155 [STATEMENT_GOTO] = sizeof(goto_statement_t),
156 [STATEMENT_LABEL] = sizeof(label_statement_t),
157 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
158 [STATEMENT_WHILE] = sizeof(while_statement_t),
159 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
160 [STATEMENT_FOR] = sizeof(for_statement_t),
161 [STATEMENT_ASM] = sizeof(asm_statement_t)
163 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
164 assert(sizes[kind] != 0);
169 * Allocate a statement node of given kind and initialize all
172 static statement_t *allocate_statement_zero(statement_kind_t kind)
174 size_t size = get_statement_struct_size(kind);
175 statement_t *res = allocate_ast_zero(size);
177 res->base.kind = kind;
182 * Returns the size of an expression node.
184 * @param kind the expression kind
186 static size_t get_expression_struct_size(expression_kind_t kind)
188 static const size_t sizes[] = {
189 [EXPR_INVALID] = sizeof(expression_base_t),
190 [EXPR_REFERENCE] = sizeof(reference_expression_t),
191 [EXPR_CONST] = sizeof(const_expression_t),
192 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
193 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
194 [EXPR_CALL] = sizeof(call_expression_t),
195 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
196 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
197 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
198 [EXPR_SELECT] = sizeof(select_expression_t),
199 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
200 [EXPR_SIZEOF] = sizeof(sizeof_expression_t),
201 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
202 [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
203 [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
204 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
205 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
206 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
207 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
208 [EXPR_VA_START] = sizeof(va_start_expression_t),
209 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
210 [EXPR_STATEMENT] = sizeof(statement_expression_t),
212 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
213 return sizes[EXPR_UNARY_FIRST];
215 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
216 return sizes[EXPR_BINARY_FIRST];
218 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
219 assert(sizes[kind] != 0);
224 * Allocate an expression node of given kind and initialize all
227 static expression_t *allocate_expression_zero(expression_kind_t kind)
229 size_t size = get_expression_struct_size(kind);
230 expression_t *res = allocate_ast_zero(size);
232 res->base.kind = kind;
237 * Returns the size of a type node.
239 * @param kind the type kind
241 static size_t get_type_struct_size(type_kind_t kind)
243 static const size_t sizes[] = {
244 [TYPE_ATOMIC] = sizeof(atomic_type_t),
245 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
246 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
247 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
248 [TYPE_ENUM] = sizeof(enum_type_t),
249 [TYPE_FUNCTION] = sizeof(function_type_t),
250 [TYPE_POINTER] = sizeof(pointer_type_t),
251 [TYPE_ARRAY] = sizeof(array_type_t),
252 [TYPE_BUILTIN] = sizeof(builtin_type_t),
253 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
254 [TYPE_TYPEOF] = sizeof(typeof_type_t),
256 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
257 assert(kind <= TYPE_TYPEOF);
258 assert(sizes[kind] != 0);
263 * Allocate a type node of given kind and initialize all
266 static type_t *allocate_type_zero(type_kind_t kind)
268 size_t size = get_type_struct_size(kind);
269 type_t *res = obstack_alloc(type_obst, size);
270 memset(res, 0, size);
272 res->base.kind = kind;
277 * Returns the size of an initializer node.
279 * @param kind the initializer kind
281 static size_t get_initializer_size(initializer_kind_t kind)
283 static const size_t sizes[] = {
284 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
285 [INITIALIZER_STRING] = sizeof(initializer_string_t),
286 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
287 [INITIALIZER_LIST] = sizeof(initializer_list_t)
289 assert(kind < sizeof(sizes) / sizeof(*sizes));
290 assert(sizes[kind] != 0);
295 * Allocate an initializer node of given kind and initialize all
298 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
300 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
307 * Free a type from the type obstack.
309 static void free_type(void *type)
311 obstack_free(type_obst, type);
315 * Returns the index of the top element of the environment stack.
317 static size_t environment_top(void)
319 return ARR_LEN(environment_stack);
323 * Returns the index of the top element of the label stack.
325 static size_t label_top(void)
327 return ARR_LEN(label_stack);
332 * Return the next token.
334 static inline void next_token(void)
336 token = lookahead_buffer[lookahead_bufpos];
337 lookahead_buffer[lookahead_bufpos] = lexer_token;
340 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
343 print_token(stderr, &token);
344 fprintf(stderr, "\n");
349 * Return the next token with a given lookahead.
351 static inline const token_t *look_ahead(int num)
353 assert(num > 0 && num <= MAX_LOOKAHEAD);
354 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
355 return &lookahead_buffer[pos];
358 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
361 * Report a parse error because an expected token was not found.
363 static void parse_error_expected(const char *message, ...)
365 if(message != NULL) {
366 errorf(HERE, "%s", message);
369 va_start(ap, message);
370 errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
375 * Report a type error.
377 static void type_error(const char *msg, const source_position_t source_position,
380 errorf(source_position, "%s, but found type '%T'", msg, type);
384 * Report an incompatible type.
386 static void type_error_incompatible(const char *msg,
387 const source_position_t source_position, type_t *type1, type_t *type2)
389 errorf(source_position, "%s, incompatible types: '%T' - '%T'", msg, type1, type2);
393 * Eat an complete block, ie. '{ ... }'.
395 static void eat_block(void)
397 if(token.type == '{')
400 while(token.type != '}') {
401 if(token.type == T_EOF)
403 if(token.type == '{') {
413 * Eat a statement until an ';' token.
415 static void eat_statement(void)
417 while(token.type != ';') {
418 if(token.type == T_EOF)
420 if(token.type == '}')
422 if(token.type == '{') {
432 * Eat a parenthesed term, ie. '( ... )'.
434 static void eat_paren(void)
436 if(token.type == '(')
439 while(token.type != ')') {
440 if(token.type == T_EOF)
442 if(token.type == ')' || token.type == ';' || token.type == '}') {
445 if(token.type == '(') {
449 if(token.type == '{') {
458 #define expect(expected) \
459 if(UNLIKELY(token.type != (expected))) { \
460 parse_error_expected(NULL, (expected), 0); \
466 #define expect_block(expected) \
467 if(UNLIKELY(token.type != (expected))) { \
468 parse_error_expected(NULL, (expected), 0); \
474 #define expect_void(expected) \
475 if(UNLIKELY(token.type != (expected))) { \
476 parse_error_expected(NULL, (expected), 0); \
482 static void set_context(context_t *new_context)
484 context = new_context;
486 last_declaration = new_context->declarations;
487 if(last_declaration != NULL) {
488 while(last_declaration->next != NULL) {
489 last_declaration = last_declaration->next;
495 * Search a symbol in a given namespace and returns its declaration or
496 * NULL if this symbol was not found.
498 static declaration_t *get_declaration(const symbol_t *const symbol, const namespace_t namespc)
500 declaration_t *declaration = symbol->declaration;
501 for( ; declaration != NULL; declaration = declaration->symbol_next) {
502 if(declaration->namespc == namespc)
510 * pushs an environment_entry on the environment stack and links the
511 * corresponding symbol to the new entry
513 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
515 symbol_t *symbol = declaration->symbol;
516 namespace_t namespc = (namespace_t)declaration->namespc;
518 /* remember old declaration */
520 entry.symbol = symbol;
521 entry.old_declaration = symbol->declaration;
522 entry.namespc = (unsigned short) namespc;
523 ARR_APP1(stack_entry_t, *stack_ptr, entry);
525 /* replace/add declaration into declaration list of the symbol */
526 if(symbol->declaration == NULL) {
527 symbol->declaration = declaration;
529 declaration_t *iter_last = NULL;
530 declaration_t *iter = symbol->declaration;
531 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
532 /* replace an entry? */
533 if(iter->namespc == namespc) {
534 if(iter_last == NULL) {
535 symbol->declaration = declaration;
537 iter_last->symbol_next = declaration;
539 declaration->symbol_next = iter->symbol_next;
544 assert(iter_last->symbol_next == NULL);
545 iter_last->symbol_next = declaration;
550 static void environment_push(declaration_t *declaration)
552 assert(declaration->source_position.input_name != NULL);
553 assert(declaration->parent_context != NULL);
554 stack_push(&environment_stack, declaration);
557 static void label_push(declaration_t *declaration)
559 declaration->parent_context = ¤t_function->context;
560 stack_push(&label_stack, declaration);
564 * pops symbols from the environment stack until @p new_top is the top element
566 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
568 stack_entry_t *stack = *stack_ptr;
569 size_t top = ARR_LEN(stack);
572 assert(new_top <= top);
576 for(i = top; i > new_top; --i) {
577 stack_entry_t *entry = &stack[i - 1];
579 declaration_t *old_declaration = entry->old_declaration;
580 symbol_t *symbol = entry->symbol;
581 namespace_t namespc = (namespace_t)entry->namespc;
583 /* replace/remove declaration */
584 declaration_t *declaration = symbol->declaration;
585 assert(declaration != NULL);
586 if(declaration->namespc == namespc) {
587 if(old_declaration == NULL) {
588 symbol->declaration = declaration->symbol_next;
590 symbol->declaration = old_declaration;
593 declaration_t *iter_last = declaration;
594 declaration_t *iter = declaration->symbol_next;
595 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
596 /* replace an entry? */
597 if(iter->namespc == namespc) {
598 assert(iter_last != NULL);
599 iter_last->symbol_next = old_declaration;
600 old_declaration->symbol_next = iter->symbol_next;
604 assert(iter != NULL);
608 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
611 static void environment_pop_to(size_t new_top)
613 stack_pop_to(&environment_stack, new_top);
616 static void label_pop_to(size_t new_top)
618 stack_pop_to(&label_stack, new_top);
622 static int get_rank(const type_t *type)
624 assert(!is_typeref(type));
625 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
626 * and esp. footnote 108). However we can't fold constants (yet), so we
627 * can't decide whether unsigned int is possible, while int always works.
628 * (unsigned int would be preferable when possible... for stuff like
629 * struct { enum { ... } bla : 4; } ) */
630 if(type->kind == TYPE_ENUM)
631 return ATOMIC_TYPE_INT;
633 assert(type->kind == TYPE_ATOMIC);
634 const atomic_type_t *atomic_type = &type->atomic;
635 atomic_type_kind_t atype = atomic_type->akind;
639 static type_t *promote_integer(type_t *type)
641 if(type->kind == TYPE_BITFIELD)
642 return promote_integer(type->bitfield.base);
644 if(get_rank(type) < ATOMIC_TYPE_INT)
651 * Create a cast expression.
653 * @param expression the expression to cast
654 * @param dest_type the destination type
656 static expression_t *create_cast_expression(expression_t *expression,
659 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
661 cast->unary.value = expression;
662 cast->base.datatype = dest_type;
668 * Check if a given expression represents the 0 pointer constant.
670 static bool is_null_pointer_constant(const expression_t *expression)
672 /* skip void* cast */
673 if(expression->kind == EXPR_UNARY_CAST
674 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
675 expression = expression->unary.value;
678 /* TODO: not correct yet, should be any constant integer expression
679 * which evaluates to 0 */
680 if (expression->kind != EXPR_CONST)
683 type_t *const type = skip_typeref(expression->base.datatype);
684 if (!is_type_integer(type))
687 return expression->conste.v.int_value == 0;
691 * Create an implicit cast expression.
693 * @param expression the expression to cast
694 * @param dest_type the destination type
696 static expression_t *create_implicit_cast(expression_t *expression,
699 type_t *source_type = expression->base.datatype;
701 if(source_type == NULL)
704 source_type = skip_typeref(source_type);
705 dest_type = skip_typeref(dest_type);
707 if(source_type == dest_type)
710 switch (dest_type->kind) {
712 /* TODO warning for implicitly converting to enum */
715 if (source_type->kind != TYPE_ATOMIC &&
716 source_type->kind != TYPE_ENUM &&
717 source_type->kind != TYPE_BITFIELD) {
718 panic("casting of non-atomic types not implemented yet");
721 if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
722 type_error_incompatible("can't cast types",
723 expression->base.source_position, source_type,
728 return create_cast_expression(expression, dest_type);
731 switch (source_type->kind) {
733 if (is_null_pointer_constant(expression)) {
734 return create_cast_expression(expression, dest_type);
739 if (pointers_compatible(source_type, dest_type)) {
740 return create_cast_expression(expression, dest_type);
745 array_type_t *array_type = &source_type->array;
746 pointer_type_t *pointer_type = &dest_type->pointer;
747 if (types_compatible(array_type->element_type,
748 pointer_type->points_to)) {
749 return create_cast_expression(expression, dest_type);
755 panic("casting of non-atomic types not implemented yet");
758 type_error_incompatible("can't implicitly cast types",
759 expression->base.source_position, source_type, dest_type);
763 panic("casting of non-atomic types not implemented yet");
767 /** Implements the rules from § 6.5.16.1 */
768 static void semantic_assign(type_t *orig_type_left, expression_t **right,
771 type_t *orig_type_right = (*right)->base.datatype;
773 if(orig_type_right == NULL)
776 type_t *const type_left = skip_typeref(orig_type_left);
777 type_t *const type_right = skip_typeref(orig_type_right);
779 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
780 (is_type_pointer(type_left) && is_null_pointer_constant(*right)) ||
781 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
782 && is_type_pointer(type_right))) {
783 *right = create_implicit_cast(*right, type_left);
787 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
788 pointer_type_t *pointer_type_left = &type_left->pointer;
789 pointer_type_t *pointer_type_right = &type_right->pointer;
790 type_t *points_to_left = pointer_type_left->points_to;
791 type_t *points_to_right = pointer_type_right->points_to;
793 points_to_left = skip_typeref(points_to_left);
794 points_to_right = skip_typeref(points_to_right);
796 /* the left type has all qualifiers from the right type */
797 unsigned missing_qualifiers
798 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
799 if(missing_qualifiers != 0) {
800 errorf(HERE, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
804 points_to_left = get_unqualified_type(points_to_left);
805 points_to_right = get_unqualified_type(points_to_right);
807 if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
808 && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
809 && !types_compatible(points_to_left, points_to_right)) {
810 goto incompatible_assign_types;
813 *right = create_implicit_cast(*right, type_left);
817 if (is_type_compound(type_left)
818 && types_compatible(type_left, type_right)) {
819 *right = create_implicit_cast(*right, type_left);
823 incompatible_assign_types:
824 /* TODO: improve error message */
825 errorf(HERE, "incompatible types in %s", context);
826 errorf(HERE, "'%T' <- '%T'", orig_type_left, orig_type_right);
829 static expression_t *parse_constant_expression(void)
831 /* start parsing at precedence 7 (conditional expression) */
832 expression_t *result = parse_sub_expression(7);
834 if(!is_constant_expression(result)) {
835 errorf(result->base.source_position, "expression '%E' is not constant\n", result);
841 static expression_t *parse_assignment_expression(void)
843 /* start parsing at precedence 2 (assignment expression) */
844 return parse_sub_expression(2);
847 static type_t *make_global_typedef(const char *name, type_t *type)
849 symbol_t *const symbol = symbol_table_insert(name);
851 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
852 declaration->namespc = NAMESPACE_NORMAL;
853 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
854 declaration->type = type;
855 declaration->symbol = symbol;
856 declaration->source_position = builtin_source_position;
858 record_declaration(declaration);
860 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF);
861 typedef_type->typedeft.declaration = declaration;
866 static const char *parse_string_literals(void)
868 assert(token.type == T_STRING_LITERAL);
869 const char *result = token.v.string;
873 while(token.type == T_STRING_LITERAL) {
874 result = concat_strings(result, token.v.string);
881 static void parse_attributes(void)
885 case T___attribute__: {
893 errorf(HERE, "EOF while parsing attribute");
912 if(token.type != T_STRING_LITERAL) {
913 parse_error_expected("while parsing assembler attribute",
918 parse_string_literals();
923 goto attributes_finished;
932 static designator_t *parse_designation(void)
934 if(token.type != '[' && token.type != '.')
937 designator_t *result = NULL;
938 designator_t *last = NULL;
941 designator_t *designator;
944 designator = allocate_ast_zero(sizeof(designator[0]));
946 designator->array_access = parse_constant_expression();
950 designator = allocate_ast_zero(sizeof(designator[0]));
952 if(token.type != T_IDENTIFIER) {
953 parse_error_expected("while parsing designator",
957 designator->symbol = token.v.symbol;
965 assert(designator != NULL);
967 last->next = designator;
976 static initializer_t *initializer_from_string(array_type_t *type,
979 /* TODO: check len vs. size of array type */
982 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
983 initializer->string.string = string;
988 static initializer_t *initializer_from_wide_string(array_type_t *const type,
989 wide_string_t *const string)
991 /* TODO: check len vs. size of array type */
994 initializer_t *const initializer =
995 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
996 initializer->wide_string.string = *string;
1001 static initializer_t *initializer_from_expression(type_t *type,
1002 expression_t *expression)
1004 /* TODO check that expression is a constant expression */
1006 /* § 6.7.8.14/15 char array may be initialized by string literals */
1007 type_t *const expr_type = expression->base.datatype;
1008 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1009 array_type_t *const array_type = &type->array;
1010 type_t *const element_type = skip_typeref(array_type->element_type);
1012 if (element_type->kind == TYPE_ATOMIC) {
1013 switch (expression->kind) {
1014 case EXPR_STRING_LITERAL:
1015 if (element_type->atomic.akind == ATOMIC_TYPE_CHAR) {
1016 return initializer_from_string(array_type,
1017 expression->string.value);
1020 case EXPR_WIDE_STRING_LITERAL: {
1021 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1022 if (get_unqualified_type(element_type) == bare_wchar_type) {
1023 return initializer_from_wide_string(array_type,
1024 &expression->wide_string.value);
1034 type_t *expression_type = skip_typeref(expression->base.datatype);
1035 if(is_type_scalar(type) || types_compatible(type, expression_type)) {
1036 semantic_assign(type, &expression, "initializer");
1038 initializer_t *result = allocate_initializer_zero(INITIALIZER_VALUE);
1039 result->value.value = expression;
1047 static initializer_t *parse_sub_initializer(type_t *type,
1048 expression_t *expression,
1049 type_t *expression_type);
1051 static initializer_t *parse_sub_initializer_elem(type_t *type)
1053 if(token.type == '{') {
1054 return parse_sub_initializer(type, NULL, NULL);
1057 expression_t *expression = parse_assignment_expression();
1058 type_t *expression_type = skip_typeref(expression->base.datatype);
1060 return parse_sub_initializer(type, expression, expression_type);
1063 static bool had_initializer_brace_warning;
1065 static void skip_designator(void)
1068 if(token.type == '.') {
1070 if(token.type == T_IDENTIFIER)
1072 } else if(token.type == '[') {
1074 parse_constant_expression();
1075 if(token.type == ']')
1083 static initializer_t *parse_sub_initializer(type_t *type,
1084 expression_t *expression,
1085 type_t *expression_type)
1087 if(is_type_scalar(type)) {
1088 /* there might be extra {} hierarchies */
1089 if(token.type == '{') {
1091 if(!had_initializer_brace_warning) {
1092 warningf(HERE, "braces around scalar initializer");
1093 had_initializer_brace_warning = true;
1095 initializer_t *result = parse_sub_initializer(type, NULL, NULL);
1096 if(token.type == ',') {
1098 /* TODO: warn about excessive elements */
1104 if(expression == NULL) {
1105 expression = parse_assignment_expression();
1107 return initializer_from_expression(type, expression);
1110 /* does the expression match the currently looked at object to initialize */
1111 if(expression != NULL) {
1112 initializer_t *result = initializer_from_expression(type, expression);
1117 bool read_paren = false;
1118 if(token.type == '{') {
1123 /* descend into subtype */
1124 initializer_t *result = NULL;
1125 initializer_t **elems;
1126 if(is_type_array(type)) {
1127 array_type_t *array_type = &type->array;
1128 type_t *element_type = array_type->element_type;
1129 element_type = skip_typeref(element_type);
1131 if(token.type == '.') {
1133 "compound designator in initializer for array type '%T'",
1139 had_initializer_brace_warning = false;
1140 if(expression == NULL) {
1141 sub = parse_sub_initializer_elem(element_type);
1143 sub = parse_sub_initializer(element_type, expression,
1147 /* didn't match the subtypes -> try the parent type */
1149 assert(!read_paren);
1153 elems = NEW_ARR_F(initializer_t*, 0);
1154 ARR_APP1(initializer_t*, elems, sub);
1157 if(token.type == '}')
1160 if(token.type == '}')
1163 sub = parse_sub_initializer_elem(element_type);
1165 /* TODO error, do nicer cleanup */
1166 errorf(HERE, "member initializer didn't match");
1170 ARR_APP1(initializer_t*, elems, sub);
1173 assert(is_type_compound(type));
1174 compound_type_t *compound_type = &type->compound;
1175 context_t *context = &compound_type->declaration->context;
1177 if(token.type == '[') {
1179 "array designator in initializer for compound type '%T'",
1184 declaration_t *first = context->declarations;
1187 type_t *first_type = first->type;
1188 first_type = skip_typeref(first_type);
1191 had_initializer_brace_warning = false;
1192 if(expression == NULL) {
1193 sub = parse_sub_initializer_elem(first_type);
1195 sub = parse_sub_initializer(first_type, expression,expression_type);
1198 /* didn't match the subtypes -> try our parent type */
1200 assert(!read_paren);
1204 elems = NEW_ARR_F(initializer_t*, 0);
1205 ARR_APP1(initializer_t*, elems, sub);
1207 declaration_t *iter = first->next;
1208 for( ; iter != NULL; iter = iter->next) {
1209 if(iter->symbol == NULL)
1211 if(iter->namespc != NAMESPACE_NORMAL)
1214 if(token.type == '}')
1217 if(token.type == '}')
1220 type_t *iter_type = iter->type;
1221 iter_type = skip_typeref(iter_type);
1223 sub = parse_sub_initializer_elem(iter_type);
1225 /* TODO error, do nicer cleanup */
1226 errorf(HERE, "member initializer didn't match");
1230 ARR_APP1(initializer_t*, elems, sub);
1234 int len = ARR_LEN(elems);
1235 size_t elems_size = sizeof(initializer_t*) * len;
1237 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1239 init->initializer.kind = INITIALIZER_LIST;
1241 memcpy(init->initializers, elems, elems_size);
1244 result = (initializer_t*) init;
1247 if(token.type == ',')
1254 static initializer_t *parse_initializer(type_t *type)
1256 initializer_t *result;
1258 type = skip_typeref(type);
1260 if(token.type != '{') {
1261 expression_t *expression = parse_assignment_expression();
1262 initializer_t *initializer = initializer_from_expression(type, expression);
1263 if(initializer == NULL) {
1264 errorf(HERE, "initializer expression '%E', type '%T' is incompatible with type '%T'", expression, expression->base.datatype, type);
1269 if(is_type_scalar(type)) {
1273 expression_t *expression = parse_assignment_expression();
1274 result = initializer_from_expression(type, expression);
1276 if(token.type == ',')
1282 result = parse_sub_initializer(type, NULL, NULL);
1288 static declaration_t *append_declaration(declaration_t *declaration);
1290 static declaration_t *parse_compound_type_specifier(bool is_struct)
1298 symbol_t *symbol = NULL;
1299 declaration_t *declaration = NULL;
1301 if (token.type == T___attribute__) {
1306 if(token.type == T_IDENTIFIER) {
1307 symbol = token.v.symbol;
1311 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1313 declaration = get_declaration(symbol, NAMESPACE_UNION);
1315 } else if(token.type != '{') {
1317 parse_error_expected("while parsing struct type specifier",
1318 T_IDENTIFIER, '{', 0);
1320 parse_error_expected("while parsing union type specifier",
1321 T_IDENTIFIER, '{', 0);
1327 if(declaration == NULL) {
1328 declaration = allocate_ast_zero(sizeof(declaration[0]));
1331 declaration->namespc = NAMESPACE_STRUCT;
1333 declaration->namespc = NAMESPACE_UNION;
1335 declaration->source_position = token.source_position;
1336 declaration->symbol = symbol;
1337 declaration->parent_context = context;
1338 if (symbol != NULL) {
1339 environment_push(declaration);
1341 append_declaration(declaration);
1344 if(token.type == '{') {
1345 if(declaration->init.is_defined) {
1346 assert(symbol != NULL);
1347 errorf(HERE, "multiple definition of '%s %Y'",
1348 is_struct ? "struct" : "union", symbol);
1349 declaration->context.declarations = NULL;
1351 declaration->init.is_defined = true;
1353 int top = environment_top();
1354 context_t *last_context = context;
1355 set_context(&declaration->context);
1357 parse_compound_type_entries();
1360 assert(context == &declaration->context);
1361 set_context(last_context);
1362 environment_pop_to(top);
1368 static void parse_enum_entries(enum_type_t *const enum_type)
1372 if(token.type == '}') {
1374 errorf(HERE, "empty enum not allowed");
1379 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
1381 if(token.type != T_IDENTIFIER) {
1382 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1386 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1387 entry->type = (type_t*) enum_type;
1388 entry->symbol = token.v.symbol;
1389 entry->source_position = token.source_position;
1392 if(token.type == '=') {
1394 entry->init.enum_value = parse_constant_expression();
1399 record_declaration(entry);
1401 if(token.type != ',')
1404 } while(token.type != '}');
1409 static type_t *parse_enum_specifier(void)
1413 declaration_t *declaration;
1416 if(token.type == T_IDENTIFIER) {
1417 symbol = token.v.symbol;
1420 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1421 } else if(token.type != '{') {
1422 parse_error_expected("while parsing enum type specifier",
1423 T_IDENTIFIER, '{', 0);
1430 if(declaration == NULL) {
1431 declaration = allocate_ast_zero(sizeof(declaration[0]));
1433 declaration->namespc = NAMESPACE_ENUM;
1434 declaration->source_position = token.source_position;
1435 declaration->symbol = symbol;
1436 declaration->parent_context = context;
1439 type_t *const type = allocate_type_zero(TYPE_ENUM);
1440 type->enumt.declaration = declaration;
1442 if(token.type == '{') {
1443 if(declaration->init.is_defined) {
1444 errorf(HERE, "multiple definitions of enum %Y", symbol);
1446 if (symbol != NULL) {
1447 environment_push(declaration);
1449 append_declaration(declaration);
1450 declaration->init.is_defined = 1;
1452 parse_enum_entries(&type->enumt);
1460 * if a symbol is a typedef to another type, return true
1462 static bool is_typedef_symbol(symbol_t *symbol)
1464 const declaration_t *const declaration =
1465 get_declaration(symbol, NAMESPACE_NORMAL);
1467 declaration != NULL &&
1468 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1471 static type_t *parse_typeof(void)
1479 expression_t *expression = NULL;
1482 switch(token.type) {
1483 case T___extension__:
1484 /* this can be a prefix to a typename or an expression */
1485 /* we simply eat it now. */
1488 } while(token.type == T___extension__);
1492 if(is_typedef_symbol(token.v.symbol)) {
1493 type = parse_typename();
1495 expression = parse_expression();
1496 type = expression->base.datatype;
1501 type = parse_typename();
1505 expression = parse_expression();
1506 type = expression->base.datatype;
1512 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1513 typeof_type->typeoft.expression = expression;
1514 typeof_type->typeoft.typeof_type = type;
1520 SPECIFIER_SIGNED = 1 << 0,
1521 SPECIFIER_UNSIGNED = 1 << 1,
1522 SPECIFIER_LONG = 1 << 2,
1523 SPECIFIER_INT = 1 << 3,
1524 SPECIFIER_DOUBLE = 1 << 4,
1525 SPECIFIER_CHAR = 1 << 5,
1526 SPECIFIER_SHORT = 1 << 6,
1527 SPECIFIER_LONG_LONG = 1 << 7,
1528 SPECIFIER_FLOAT = 1 << 8,
1529 SPECIFIER_BOOL = 1 << 9,
1530 SPECIFIER_VOID = 1 << 10,
1531 #ifdef PROVIDE_COMPLEX
1532 SPECIFIER_COMPLEX = 1 << 11,
1533 SPECIFIER_IMAGINARY = 1 << 12,
1537 static type_t *create_builtin_type(symbol_t *const symbol,
1538 type_t *const real_type)
1540 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1541 type->builtin.symbol = symbol;
1542 type->builtin.real_type = real_type;
1544 type_t *result = typehash_insert(type);
1545 if (type != result) {
1552 static type_t *get_typedef_type(symbol_t *symbol)
1554 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1555 if(declaration == NULL
1556 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1559 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1560 type->typedeft.declaration = declaration;
1565 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1567 type_t *type = NULL;
1568 unsigned type_qualifiers = 0;
1569 unsigned type_specifiers = 0;
1572 specifiers->source_position = token.source_position;
1575 switch(token.type) {
1578 #define MATCH_STORAGE_CLASS(token, class) \
1580 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1581 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1583 specifiers->storage_class = class; \
1587 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1588 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1589 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1590 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1591 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1594 switch (specifiers->storage_class) {
1595 case STORAGE_CLASS_NONE:
1596 specifiers->storage_class = STORAGE_CLASS_THREAD;
1599 case STORAGE_CLASS_EXTERN:
1600 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1603 case STORAGE_CLASS_STATIC:
1604 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1608 errorf(HERE, "multiple storage classes in declaration specifiers");
1614 /* type qualifiers */
1615 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1617 type_qualifiers |= qualifier; \
1621 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1622 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1623 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1625 case T___extension__:
1630 /* type specifiers */
1631 #define MATCH_SPECIFIER(token, specifier, name) \
1634 if(type_specifiers & specifier) { \
1635 errorf(HERE, "multiple " name " type specifiers given"); \
1637 type_specifiers |= specifier; \
1641 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1642 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1643 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1644 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1645 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1646 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1647 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1648 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1649 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1650 #ifdef PROVIDE_COMPLEX
1651 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1652 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1655 /* only in microsoft mode */
1656 specifiers->decl_modifiers |= DM_FORCEINLINE;
1660 specifiers->is_inline = true;
1665 if(type_specifiers & SPECIFIER_LONG_LONG) {
1666 errorf(HERE, "multiple type specifiers given");
1667 } else if(type_specifiers & SPECIFIER_LONG) {
1668 type_specifiers |= SPECIFIER_LONG_LONG;
1670 type_specifiers |= SPECIFIER_LONG;
1674 /* TODO: if type != NULL for the following rules should issue
1677 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1679 type->compound.declaration = parse_compound_type_specifier(true);
1683 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1685 type->compound.declaration = parse_compound_type_specifier(false);
1689 type = parse_enum_specifier();
1692 type = parse_typeof();
1694 case T___builtin_va_list:
1695 type = duplicate_type(type_valist);
1699 case T___attribute__:
1704 case T_IDENTIFIER: {
1705 type_t *typedef_type = get_typedef_type(token.v.symbol);
1707 if(typedef_type == NULL)
1708 goto finish_specifiers;
1711 type = typedef_type;
1715 /* function specifier */
1717 goto finish_specifiers;
1724 atomic_type_kind_t atomic_type;
1726 /* match valid basic types */
1727 switch(type_specifiers) {
1728 case SPECIFIER_VOID:
1729 atomic_type = ATOMIC_TYPE_VOID;
1731 case SPECIFIER_CHAR:
1732 atomic_type = ATOMIC_TYPE_CHAR;
1734 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1735 atomic_type = ATOMIC_TYPE_SCHAR;
1737 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1738 atomic_type = ATOMIC_TYPE_UCHAR;
1740 case SPECIFIER_SHORT:
1741 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1742 case SPECIFIER_SHORT | SPECIFIER_INT:
1743 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1744 atomic_type = ATOMIC_TYPE_SHORT;
1746 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1747 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1748 atomic_type = ATOMIC_TYPE_USHORT;
1751 case SPECIFIER_SIGNED:
1752 case SPECIFIER_SIGNED | SPECIFIER_INT:
1753 atomic_type = ATOMIC_TYPE_INT;
1755 case SPECIFIER_UNSIGNED:
1756 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1757 atomic_type = ATOMIC_TYPE_UINT;
1759 case SPECIFIER_LONG:
1760 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1761 case SPECIFIER_LONG | SPECIFIER_INT:
1762 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1763 atomic_type = ATOMIC_TYPE_LONG;
1765 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1766 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1767 atomic_type = ATOMIC_TYPE_ULONG;
1769 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1770 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1771 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1772 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1774 atomic_type = ATOMIC_TYPE_LONGLONG;
1776 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1777 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1779 atomic_type = ATOMIC_TYPE_ULONGLONG;
1781 case SPECIFIER_FLOAT:
1782 atomic_type = ATOMIC_TYPE_FLOAT;
1784 case SPECIFIER_DOUBLE:
1785 atomic_type = ATOMIC_TYPE_DOUBLE;
1787 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1788 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1790 case SPECIFIER_BOOL:
1791 atomic_type = ATOMIC_TYPE_BOOL;
1793 #ifdef PROVIDE_COMPLEX
1794 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1795 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1797 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1798 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1800 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1801 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1803 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1804 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1806 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1807 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1809 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1810 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1814 /* invalid specifier combination, give an error message */
1815 if(type_specifiers == 0) {
1816 if (! strict_mode) {
1817 warningf(HERE, "no type specifiers in declaration, using int");
1818 atomic_type = ATOMIC_TYPE_INT;
1821 errorf(HERE, "no type specifiers given in declaration");
1823 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1824 (type_specifiers & SPECIFIER_UNSIGNED)) {
1825 errorf(HERE, "signed and unsigned specifiers gives");
1826 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1827 errorf(HERE, "only integer types can be signed or unsigned");
1829 errorf(HERE, "multiple datatypes in declaration");
1831 atomic_type = ATOMIC_TYPE_INVALID;
1834 type = allocate_type_zero(TYPE_ATOMIC);
1835 type->atomic.akind = atomic_type;
1838 if(type_specifiers != 0) {
1839 errorf(HERE, "multiple datatypes in declaration");
1843 type->base.qualifiers = type_qualifiers;
1845 type_t *result = typehash_insert(type);
1846 if(newtype && result != type) {
1850 specifiers->type = result;
1853 static type_qualifiers_t parse_type_qualifiers(void)
1855 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1858 switch(token.type) {
1859 /* type qualifiers */
1860 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1861 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1862 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1865 return type_qualifiers;
1870 static declaration_t *parse_identifier_list(void)
1872 declaration_t *declarations = NULL;
1873 declaration_t *last_declaration = NULL;
1875 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1877 declaration->source_position = token.source_position;
1878 declaration->symbol = token.v.symbol;
1881 if(last_declaration != NULL) {
1882 last_declaration->next = declaration;
1884 declarations = declaration;
1886 last_declaration = declaration;
1888 if(token.type != ',')
1891 } while(token.type == T_IDENTIFIER);
1893 return declarations;
1896 static void semantic_parameter(declaration_t *declaration)
1898 /* TODO: improve error messages */
1900 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1901 errorf(HERE, "typedef not allowed in parameter list");
1902 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1903 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1904 errorf(HERE, "parameter may only have none or register storage class");
1907 type_t *orig_type = declaration->type;
1908 if(orig_type == NULL)
1910 type_t *type = skip_typeref(orig_type);
1912 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1913 * into a pointer. § 6.7.5.3 (7) */
1914 if (is_type_array(type)) {
1915 const array_type_t *arr_type = &type->array;
1916 type_t *element_type = arr_type->element_type;
1918 type = make_pointer_type(element_type, type->base.qualifiers);
1920 declaration->type = type;
1923 if(is_type_incomplete(type)) {
1924 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1925 orig_type, declaration->symbol);
1929 static declaration_t *parse_parameter(void)
1931 declaration_specifiers_t specifiers;
1932 memset(&specifiers, 0, sizeof(specifiers));
1934 parse_declaration_specifiers(&specifiers);
1936 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1938 semantic_parameter(declaration);
1943 static declaration_t *parse_parameters(function_type_t *type)
1945 if(token.type == T_IDENTIFIER) {
1946 symbol_t *symbol = token.v.symbol;
1947 if(!is_typedef_symbol(symbol)) {
1948 type->kr_style_parameters = true;
1949 return parse_identifier_list();
1953 if(token.type == ')') {
1954 type->unspecified_parameters = 1;
1957 if(token.type == T_void && look_ahead(1)->type == ')') {
1962 declaration_t *declarations = NULL;
1963 declaration_t *declaration;
1964 declaration_t *last_declaration = NULL;
1965 function_parameter_t *parameter;
1966 function_parameter_t *last_parameter = NULL;
1969 switch(token.type) {
1973 return declarations;
1976 case T___extension__:
1978 declaration = parse_parameter();
1980 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1981 memset(parameter, 0, sizeof(parameter[0]));
1982 parameter->type = declaration->type;
1984 if(last_parameter != NULL) {
1985 last_declaration->next = declaration;
1986 last_parameter->next = parameter;
1988 type->parameters = parameter;
1989 declarations = declaration;
1991 last_parameter = parameter;
1992 last_declaration = declaration;
1996 return declarations;
1998 if(token.type != ',')
1999 return declarations;
2009 } construct_type_type_t;
2011 typedef struct construct_type_t construct_type_t;
2012 struct construct_type_t {
2013 construct_type_type_t type;
2014 construct_type_t *next;
2017 typedef struct parsed_pointer_t parsed_pointer_t;
2018 struct parsed_pointer_t {
2019 construct_type_t construct_type;
2020 type_qualifiers_t type_qualifiers;
2023 typedef struct construct_function_type_t construct_function_type_t;
2024 struct construct_function_type_t {
2025 construct_type_t construct_type;
2026 type_t *function_type;
2029 typedef struct parsed_array_t parsed_array_t;
2030 struct parsed_array_t {
2031 construct_type_t construct_type;
2032 type_qualifiers_t type_qualifiers;
2038 typedef struct construct_base_type_t construct_base_type_t;
2039 struct construct_base_type_t {
2040 construct_type_t construct_type;
2044 static construct_type_t *parse_pointer_declarator(void)
2048 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
2049 memset(pointer, 0, sizeof(pointer[0]));
2050 pointer->construct_type.type = CONSTRUCT_POINTER;
2051 pointer->type_qualifiers = parse_type_qualifiers();
2053 return (construct_type_t*) pointer;
2056 static construct_type_t *parse_array_declarator(void)
2060 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
2061 memset(array, 0, sizeof(array[0]));
2062 array->construct_type.type = CONSTRUCT_ARRAY;
2064 if(token.type == T_static) {
2065 array->is_static = true;
2069 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
2070 if(type_qualifiers != 0) {
2071 if(token.type == T_static) {
2072 array->is_static = true;
2076 array->type_qualifiers = type_qualifiers;
2078 if(token.type == '*' && look_ahead(1)->type == ']') {
2079 array->is_variable = true;
2081 } else if(token.type != ']') {
2082 array->size = parse_assignment_expression();
2087 return (construct_type_t*) array;
2090 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2094 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2096 declaration_t *parameters = parse_parameters(&type->function);
2097 if(declaration != NULL) {
2098 declaration->context.declarations = parameters;
2101 construct_function_type_t *construct_function_type =
2102 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2103 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2104 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2105 construct_function_type->function_type = type;
2109 return (construct_type_t*) construct_function_type;
2112 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2113 bool may_be_abstract)
2115 /* construct a single linked list of construct_type_t's which describe
2116 * how to construct the final declarator type */
2117 construct_type_t *first = NULL;
2118 construct_type_t *last = NULL;
2121 while(token.type == '*') {
2122 construct_type_t *type = parse_pointer_declarator();
2133 /* TODO: find out if this is correct */
2136 construct_type_t *inner_types = NULL;
2138 switch(token.type) {
2140 if(declaration == NULL) {
2141 errorf(HERE, "no identifier expected in typename");
2143 declaration->symbol = token.v.symbol;
2144 declaration->source_position = token.source_position;
2150 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2156 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2157 /* avoid a loop in the outermost scope, because eat_statement doesn't
2159 if(token.type == '}' && current_function == NULL) {
2167 construct_type_t *p = last;
2170 construct_type_t *type;
2171 switch(token.type) {
2173 type = parse_function_declarator(declaration);
2176 type = parse_array_declarator();
2179 goto declarator_finished;
2182 /* insert in the middle of the list (behind p) */
2184 type->next = p->next;
2195 declarator_finished:
2198 /* append inner_types at the end of the list, we don't to set last anymore
2199 * as it's not needed anymore */
2201 assert(first == NULL);
2202 first = inner_types;
2204 last->next = inner_types;
2210 static type_t *construct_declarator_type(construct_type_t *construct_list,
2213 construct_type_t *iter = construct_list;
2214 for( ; iter != NULL; iter = iter->next) {
2215 switch(iter->type) {
2216 case CONSTRUCT_INVALID:
2217 panic("invalid type construction found");
2218 case CONSTRUCT_FUNCTION: {
2219 construct_function_type_t *construct_function_type
2220 = (construct_function_type_t*) iter;
2222 type_t *function_type = construct_function_type->function_type;
2224 function_type->function.return_type = type;
2226 type = function_type;
2230 case CONSTRUCT_POINTER: {
2231 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2232 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2233 pointer_type->pointer.points_to = type;
2234 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2236 type = pointer_type;
2240 case CONSTRUCT_ARRAY: {
2241 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2242 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2244 array_type->base.qualifiers = parsed_array->type_qualifiers;
2245 array_type->array.element_type = type;
2246 array_type->array.is_static = parsed_array->is_static;
2247 array_type->array.is_variable = parsed_array->is_variable;
2248 array_type->array.size = parsed_array->size;
2255 type_t *hashed_type = typehash_insert(type);
2256 if(hashed_type != type) {
2257 /* the function type was constructed earlier freeing it here will
2258 * destroy other types... */
2259 if(iter->type != CONSTRUCT_FUNCTION) {
2269 static declaration_t *parse_declarator(
2270 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2272 type_t *type = specifiers->type;
2273 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2274 declaration->storage_class = specifiers->storage_class;
2275 declaration->modifiers = specifiers->decl_modifiers;
2276 declaration->is_inline = specifiers->is_inline;
2278 construct_type_t *construct_type
2279 = parse_inner_declarator(declaration, may_be_abstract);
2280 declaration->type = construct_declarator_type(construct_type, type);
2282 if(construct_type != NULL) {
2283 obstack_free(&temp_obst, construct_type);
2289 static type_t *parse_abstract_declarator(type_t *base_type)
2291 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2293 type_t *result = construct_declarator_type(construct_type, base_type);
2294 if(construct_type != NULL) {
2295 obstack_free(&temp_obst, construct_type);
2301 static declaration_t *append_declaration(declaration_t* const declaration)
2303 if (last_declaration != NULL) {
2304 last_declaration->next = declaration;
2306 context->declarations = declaration;
2308 last_declaration = declaration;
2312 static declaration_t *internal_record_declaration(
2313 declaration_t *const declaration,
2314 const bool is_function_definition)
2316 const symbol_t *const symbol = declaration->symbol;
2317 const namespace_t namespc = (namespace_t)declaration->namespc;
2319 const type_t *const type = skip_typeref(declaration->type);
2320 if (is_type_function(type) && type->function.unspecified_parameters) {
2321 warningf(declaration->source_position,
2322 "function declaration '%#T' is not a prototype",
2323 type, declaration->symbol);
2326 declaration_t *const previous_declaration = get_declaration(symbol, namespc);
2327 assert(declaration != previous_declaration);
2328 if (previous_declaration != NULL
2329 && previous_declaration->parent_context == context) {
2330 /* can happen for K&R style declarations */
2331 if(previous_declaration->type == NULL) {
2332 previous_declaration->type = declaration->type;
2335 const type_t *const prev_type = skip_typeref(previous_declaration->type);
2336 if (!types_compatible(type, prev_type)) {
2337 errorf(declaration->source_position,
2338 "declaration '%#T' is incompatible with previous declaration '%#T'",
2339 type, symbol, previous_declaration->type, symbol);
2340 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2342 unsigned old_storage_class = previous_declaration->storage_class;
2343 unsigned new_storage_class = declaration->storage_class;
2345 /* pretend no storage class means extern for function declarations
2346 * (except if the previous declaration is neither none nor extern) */
2347 if (is_type_function(type)) {
2348 switch (old_storage_class) {
2349 case STORAGE_CLASS_NONE:
2350 old_storage_class = STORAGE_CLASS_EXTERN;
2352 case STORAGE_CLASS_EXTERN:
2353 if (new_storage_class == STORAGE_CLASS_NONE && !is_function_definition) {
2354 new_storage_class = STORAGE_CLASS_EXTERN;
2362 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2363 new_storage_class == STORAGE_CLASS_EXTERN) {
2364 warn_redundant_declaration:
2365 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2366 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2367 } else if (current_function == NULL) {
2368 if (old_storage_class != STORAGE_CLASS_STATIC &&
2369 new_storage_class == STORAGE_CLASS_STATIC) {
2370 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2371 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2373 if (old_storage_class != STORAGE_CLASS_EXTERN) {
2374 goto warn_redundant_declaration;
2376 if (new_storage_class == STORAGE_CLASS_NONE) {
2377 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2381 if (old_storage_class == new_storage_class) {
2382 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2384 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2386 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2389 return previous_declaration;
2392 assert(declaration->parent_context == NULL);
2393 assert(declaration->symbol != NULL);
2394 assert(context != NULL);
2396 declaration->parent_context = context;
2398 environment_push(declaration);
2399 return append_declaration(declaration);
2402 static declaration_t *record_declaration(declaration_t *declaration)
2404 return internal_record_declaration(declaration, false);
2407 static declaration_t *record_function_definition(declaration_t *const declaration)
2409 return internal_record_declaration(declaration, true);
2412 static void parser_error_multiple_definition(declaration_t *declaration,
2413 const source_position_t source_position)
2415 errorf(source_position, "multiple definition of symbol '%Y'",
2416 declaration->symbol);
2417 errorf(declaration->source_position,
2418 "this is the location of the previous definition.");
2421 static bool is_declaration_specifier(const token_t *token,
2422 bool only_type_specifiers)
2424 switch(token->type) {
2428 return is_typedef_symbol(token->v.symbol);
2430 case T___extension__:
2433 return !only_type_specifiers;
2440 static void parse_init_declarator_rest(declaration_t *declaration)
2444 type_t *orig_type = declaration->type;
2445 type_t *type = NULL;
2446 if(orig_type != NULL)
2447 type = skip_typeref(orig_type);
2449 if(declaration->init.initializer != NULL) {
2450 parser_error_multiple_definition(declaration, token.source_position);
2453 initializer_t *initializer = parse_initializer(type);
2455 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2456 * the array type size */
2457 if(type != NULL && is_type_array(type) && initializer != NULL) {
2458 array_type_t *array_type = &type->array;
2460 if(array_type->size == NULL) {
2461 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2463 cnst->base.datatype = type_size_t;
2465 switch (initializer->kind) {
2466 case INITIALIZER_LIST: {
2467 initializer_list_t *const list = &initializer->list;
2468 cnst->conste.v.int_value = list->len;
2472 case INITIALIZER_STRING: {
2473 initializer_string_t *const string = &initializer->string;
2474 cnst->conste.v.int_value = strlen(string->string) + 1;
2478 case INITIALIZER_WIDE_STRING: {
2479 initializer_wide_string_t *const string = &initializer->wide_string;
2480 cnst->conste.v.int_value = string->string.size;
2485 panic("invalid initializer type");
2488 array_type->size = cnst;
2492 if(type != NULL && is_type_function(type)) {
2493 errorf(declaration->source_position,
2494 "initializers not allowed for function types at declator '%Y' (type '%T')",
2495 declaration->symbol, orig_type);
2497 declaration->init.initializer = initializer;
2501 /* parse rest of a declaration without any declarator */
2502 static void parse_anonymous_declaration_rest(
2503 const declaration_specifiers_t *specifiers,
2504 parsed_declaration_func finished_declaration)
2508 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2510 declaration->type = specifiers->type;
2511 declaration->storage_class = specifiers->storage_class;
2512 declaration->source_position = specifiers->source_position;
2514 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2515 warningf(declaration->source_position, "useless storage class in empty declaration");
2518 type_t *type = declaration->type;
2519 switch (type->kind) {
2520 case TYPE_COMPOUND_STRUCT:
2521 case TYPE_COMPOUND_UNION: {
2522 const compound_type_t *compound_type = &type->compound;
2523 if (compound_type->declaration->symbol == NULL) {
2524 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2533 warningf(declaration->source_position, "empty declaration");
2537 finished_declaration(declaration);
2540 static void parse_declaration_rest(declaration_t *ndeclaration,
2541 const declaration_specifiers_t *specifiers,
2542 parsed_declaration_func finished_declaration)
2545 declaration_t *declaration = finished_declaration(ndeclaration);
2547 type_t *orig_type = declaration->type;
2548 type_t *type = skip_typeref(orig_type);
2550 if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
2551 warningf(declaration->source_position,
2552 "variable '%Y' declared 'inline'\n", declaration->symbol);
2555 if(token.type == '=') {
2556 parse_init_declarator_rest(declaration);
2559 if(token.type != ',')
2563 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2568 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2570 symbol_t *symbol = declaration->symbol;
2571 if(symbol == NULL) {
2572 errorf(HERE, "anonymous declaration not valid as function parameter");
2575 namespace_t namespc = (namespace_t) declaration->namespc;
2576 if(namespc != NAMESPACE_NORMAL) {
2577 return record_declaration(declaration);
2580 declaration_t *previous_declaration = get_declaration(symbol, namespc);
2581 if(previous_declaration == NULL ||
2582 previous_declaration->parent_context != context) {
2583 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
2588 if(previous_declaration->type == NULL) {
2589 previous_declaration->type = declaration->type;
2590 previous_declaration->storage_class = declaration->storage_class;
2591 previous_declaration->parent_context = context;
2592 return previous_declaration;
2594 return record_declaration(declaration);
2598 static void parse_declaration(parsed_declaration_func finished_declaration)
2600 declaration_specifiers_t specifiers;
2601 memset(&specifiers, 0, sizeof(specifiers));
2602 parse_declaration_specifiers(&specifiers);
2604 if(token.type == ';') {
2605 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2607 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2608 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2612 static void parse_kr_declaration_list(declaration_t *declaration)
2614 type_t *type = skip_typeref(declaration->type);
2615 if(!is_type_function(type))
2618 if(!type->function.kr_style_parameters)
2621 /* push function parameters */
2622 int top = environment_top();
2623 context_t *last_context = context;
2624 set_context(&declaration->context);
2626 declaration_t *parameter = declaration->context.declarations;
2627 for( ; parameter != NULL; parameter = parameter->next) {
2628 assert(parameter->parent_context == NULL);
2629 parameter->parent_context = context;
2630 environment_push(parameter);
2633 /* parse declaration list */
2634 while(is_declaration_specifier(&token, false)) {
2635 parse_declaration(finished_kr_declaration);
2638 /* pop function parameters */
2639 assert(context == &declaration->context);
2640 set_context(last_context);
2641 environment_pop_to(top);
2643 /* update function type */
2644 type_t *new_type = duplicate_type(type);
2645 new_type->function.kr_style_parameters = false;
2647 function_parameter_t *parameters = NULL;
2648 function_parameter_t *last_parameter = NULL;
2650 declaration_t *parameter_declaration = declaration->context.declarations;
2651 for( ; parameter_declaration != NULL;
2652 parameter_declaration = parameter_declaration->next) {
2653 type_t *parameter_type = parameter_declaration->type;
2654 if(parameter_type == NULL) {
2656 errorf(HERE, "no type specified for function parameter '%Y'",
2657 parameter_declaration->symbol);
2659 warningf(HERE, "no type specified for function parameter '%Y', using int",
2660 parameter_declaration->symbol);
2661 parameter_type = type_int;
2662 parameter_declaration->type = parameter_type;
2666 semantic_parameter(parameter_declaration);
2667 parameter_type = parameter_declaration->type;
2669 function_parameter_t *function_parameter
2670 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2671 memset(function_parameter, 0, sizeof(function_parameter[0]));
2673 function_parameter->type = parameter_type;
2674 if(last_parameter != NULL) {
2675 last_parameter->next = function_parameter;
2677 parameters = function_parameter;
2679 last_parameter = function_parameter;
2681 new_type->function.parameters = parameters;
2683 type = typehash_insert(new_type);
2684 if(type != new_type) {
2685 obstack_free(type_obst, new_type);
2688 declaration->type = type;
2692 * Check if all labels are defined in the current function.
2694 static void check_for_missing_labels(void)
2696 bool first_err = true;
2697 for (const goto_statement_t *goto_statement = goto_first;
2698 goto_statement != NULL;
2699 goto_statement = goto_statement->next) {
2700 const declaration_t *label = goto_statement->label;
2702 if (label->source_position.input_name == NULL) {
2705 diagnosticf("%s: In function '%Y':\n",
2706 current_function->source_position.input_name,
2707 current_function->symbol);
2709 errorf(goto_statement->statement.source_position,
2710 "label '%Y' used but not defined", label->symbol);
2713 goto_first = goto_last = NULL;
2716 static void parse_external_declaration(void)
2718 /* function-definitions and declarations both start with declaration
2720 declaration_specifiers_t specifiers;
2721 memset(&specifiers, 0, sizeof(specifiers));
2722 parse_declaration_specifiers(&specifiers);
2724 /* must be a declaration */
2725 if(token.type == ';') {
2726 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2730 /* declarator is common to both function-definitions and declarations */
2731 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2733 /* must be a declaration */
2734 if(token.type == ',' || token.type == '=' || token.type == ';') {
2735 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2739 /* must be a function definition */
2740 parse_kr_declaration_list(ndeclaration);
2742 if(token.type != '{') {
2743 parse_error_expected("while parsing function definition", '{', 0);
2748 type_t *type = ndeclaration->type;
2754 /* note that we don't skip typerefs: the standard doesn't allow them here
2755 * (so we can't use is_type_function here) */
2756 if(type->kind != TYPE_FUNCTION) {
2757 errorf(HERE, "declarator '%#T' has a body but is not a function type",
2758 type, ndeclaration->symbol);
2763 /* § 6.7.5.3 (14) a function definition with () means no
2764 * parameters (and not unspecified parameters) */
2765 if(type->function.unspecified_parameters) {
2766 type_t *duplicate = duplicate_type(type);
2767 duplicate->function.unspecified_parameters = false;
2769 type = typehash_insert(duplicate);
2770 if(type != duplicate) {
2771 obstack_free(type_obst, duplicate);
2773 ndeclaration->type = type;
2776 declaration_t *const declaration = record_function_definition(ndeclaration);
2777 if(ndeclaration != declaration) {
2778 declaration->context = ndeclaration->context;
2780 type = skip_typeref(declaration->type);
2782 /* push function parameters and switch context */
2783 int top = environment_top();
2784 context_t *last_context = context;
2785 set_context(&declaration->context);
2787 declaration_t *parameter = declaration->context.declarations;
2788 for( ; parameter != NULL; parameter = parameter->next) {
2789 if(parameter->parent_context == &ndeclaration->context) {
2790 parameter->parent_context = context;
2792 assert(parameter->parent_context == NULL
2793 || parameter->parent_context == context);
2794 parameter->parent_context = context;
2795 environment_push(parameter);
2798 if(declaration->init.statement != NULL) {
2799 parser_error_multiple_definition(declaration, token.source_position);
2801 goto end_of_parse_external_declaration;
2803 /* parse function body */
2804 int label_stack_top = label_top();
2805 declaration_t *old_current_function = current_function;
2806 current_function = declaration;
2808 declaration->init.statement = parse_compound_statement();
2809 check_for_missing_labels();
2811 assert(current_function == declaration);
2812 current_function = old_current_function;
2813 label_pop_to(label_stack_top);
2816 end_of_parse_external_declaration:
2817 assert(context == &declaration->context);
2818 set_context(last_context);
2819 environment_pop_to(top);
2822 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2824 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2825 type->bitfield.base = base;
2826 type->bitfield.size = size;
2831 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2833 /* TODO: check constraints for struct declarations (in specifiers) */
2835 declaration_t *declaration;
2837 if(token.type == ':') {
2840 type_t *base_type = specifiers->type;
2841 expression_t *size = parse_constant_expression();
2843 type_t *type = make_bitfield_type(base_type, size);
2845 declaration = allocate_ast_zero(sizeof(declaration[0]));
2847 declaration->namespc = NAMESPACE_NORMAL;
2848 declaration->storage_class = STORAGE_CLASS_NONE;
2849 declaration->source_position = token.source_position;
2850 declaration->modifiers = specifiers->decl_modifiers;
2851 declaration->type = type;
2853 record_declaration(declaration);
2855 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2857 if(token.type == ':') {
2859 expression_t *size = parse_constant_expression();
2861 type_t *type = make_bitfield_type(declaration->type, size);
2862 declaration->type = type;
2865 record_declaration(declaration);
2867 if(token.type != ',')
2874 static void parse_compound_type_entries(void)
2878 while(token.type != '}' && token.type != T_EOF) {
2879 declaration_specifiers_t specifiers;
2880 memset(&specifiers, 0, sizeof(specifiers));
2881 parse_declaration_specifiers(&specifiers);
2883 parse_struct_declarators(&specifiers);
2885 if(token.type == T_EOF) {
2886 errorf(HERE, "EOF while parsing struct");
2891 static type_t *parse_typename(void)
2893 declaration_specifiers_t specifiers;
2894 memset(&specifiers, 0, sizeof(specifiers));
2895 parse_declaration_specifiers(&specifiers);
2896 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2897 /* TODO: improve error message, user does probably not know what a
2898 * storage class is...
2900 errorf(HERE, "typename may not have a storage class");
2903 type_t *result = parse_abstract_declarator(specifiers.type);
2911 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2912 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2913 expression_t *left);
2915 typedef struct expression_parser_function_t expression_parser_function_t;
2916 struct expression_parser_function_t {
2917 unsigned precedence;
2918 parse_expression_function parser;
2919 unsigned infix_precedence;
2920 parse_expression_infix_function infix_parser;
2923 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2926 * Creates a new invalid expression.
2928 static expression_t *create_invalid_expression(void)
2930 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2931 expression->base.source_position = token.source_position;
2935 static expression_t *expected_expression_error(void)
2937 errorf(HERE, "expected expression, got token '%K'", &token);
2941 return create_invalid_expression();
2945 * Parse a string constant.
2947 static expression_t *parse_string_const(void)
2949 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2950 cnst->base.datatype = type_string;
2951 cnst->string.value = parse_string_literals();
2957 * Parse a wide string constant.
2959 static expression_t *parse_wide_string_const(void)
2961 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2962 cnst->base.datatype = type_wchar_t_ptr;
2963 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2969 * Parse an integer constant.
2971 static expression_t *parse_int_const(void)
2973 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2974 cnst->base.datatype = token.datatype;
2975 cnst->conste.v.int_value = token.v.intvalue;
2983 * Parse a float constant.
2985 static expression_t *parse_float_const(void)
2987 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2988 cnst->base.datatype = token.datatype;
2989 cnst->conste.v.float_value = token.v.floatvalue;
2996 static declaration_t *create_implicit_function(symbol_t *symbol,
2997 const source_position_t source_position)
2999 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
3000 ntype->function.return_type = type_int;
3001 ntype->function.unspecified_parameters = true;
3003 type_t *type = typehash_insert(ntype);
3008 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
3010 declaration->storage_class = STORAGE_CLASS_EXTERN;
3011 declaration->type = type;
3012 declaration->symbol = symbol;
3013 declaration->source_position = source_position;
3014 declaration->parent_context = global_context;
3016 context_t *old_context = context;
3017 set_context(global_context);
3019 environment_push(declaration);
3020 /* prepend the declaration to the global declarations list */
3021 declaration->next = context->declarations;
3022 context->declarations = declaration;
3024 assert(context == global_context);
3025 set_context(old_context);
3031 * Creates a return_type (func)(argument_type) function type if not
3034 * @param return_type the return type
3035 * @param argument_type the argument type
3037 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
3039 function_parameter_t *parameter
3040 = obstack_alloc(type_obst, sizeof(parameter[0]));
3041 memset(parameter, 0, sizeof(parameter[0]));
3042 parameter->type = argument_type;
3044 type_t *type = allocate_type_zero(TYPE_FUNCTION);
3045 type->function.return_type = return_type;
3046 type->function.parameters = parameter;
3048 type_t *result = typehash_insert(type);
3049 if(result != type) {
3057 * Creates a function type for some function like builtins.
3059 * @param symbol the symbol describing the builtin
3061 static type_t *get_builtin_symbol_type(symbol_t *symbol)
3063 switch(symbol->ID) {
3064 case T___builtin_alloca:
3065 return make_function_1_type(type_void_ptr, type_size_t);
3066 case T___builtin_nan:
3067 return make_function_1_type(type_double, type_string);
3068 case T___builtin_nanf:
3069 return make_function_1_type(type_float, type_string);
3070 case T___builtin_nand:
3071 return make_function_1_type(type_long_double, type_string);
3072 case T___builtin_va_end:
3073 return make_function_1_type(type_void, type_valist);
3075 panic("not implemented builtin symbol found");
3080 * Performs automatic type cast as described in § 6.3.2.1.
3082 * @param orig_type the original type
3084 static type_t *automatic_type_conversion(type_t *orig_type)
3086 if(orig_type == NULL)
3089 type_t *type = skip_typeref(orig_type);
3090 if(is_type_array(type)) {
3091 array_type_t *array_type = &type->array;
3092 type_t *element_type = array_type->element_type;
3093 unsigned qualifiers = array_type->type.qualifiers;
3095 return make_pointer_type(element_type, qualifiers);
3098 if(is_type_function(type)) {
3099 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3106 * reverts the automatic casts of array to pointer types and function
3107 * to function-pointer types as defined § 6.3.2.1
3109 type_t *revert_automatic_type_conversion(const expression_t *expression)
3111 if(expression->base.datatype == NULL)
3114 switch(expression->kind) {
3115 case EXPR_REFERENCE: {
3116 const reference_expression_t *ref = &expression->reference;
3117 return ref->declaration->type;
3120 const select_expression_t *select = &expression->select;
3121 return select->compound_entry->type;
3123 case EXPR_UNARY_DEREFERENCE: {
3124 expression_t *value = expression->unary.value;
3125 type_t *type = skip_typeref(value->base.datatype);
3126 pointer_type_t *pointer_type = &type->pointer;
3128 return pointer_type->points_to;
3130 case EXPR_BUILTIN_SYMBOL: {
3131 const builtin_symbol_expression_t *builtin
3132 = &expression->builtin_symbol;
3133 return get_builtin_symbol_type(builtin->symbol);
3135 case EXPR_ARRAY_ACCESS: {
3136 const array_access_expression_t *array_access
3137 = &expression->array_access;
3138 const expression_t *array_ref = array_access->array_ref;
3139 type_t *type_left = skip_typeref(array_ref->base.datatype);
3140 assert(is_type_pointer(type_left));
3141 pointer_type_t *pointer_type = &type_left->pointer;
3142 return pointer_type->points_to;
3149 return expression->base.datatype;
3152 static expression_t *parse_reference(void)
3154 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3156 reference_expression_t *ref = &expression->reference;
3157 ref->symbol = token.v.symbol;
3159 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3161 source_position_t source_position = token.source_position;
3164 if(declaration == NULL) {
3165 if (! strict_mode && token.type == '(') {
3166 /* an implicitly defined function */
3167 warningf(HERE, "implicit declaration of function '%Y'",
3170 declaration = create_implicit_function(ref->symbol,
3173 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3178 type_t *type = declaration->type;
3180 /* we always do the auto-type conversions; the & and sizeof parser contains
3181 * code to revert this! */
3182 type = automatic_type_conversion(type);
3184 ref->declaration = declaration;
3185 ref->expression.datatype = type;
3190 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3194 /* TODO check if explicit cast is allowed and issue warnings/errors */
3197 static expression_t *parse_cast(void)
3199 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3201 cast->base.source_position = token.source_position;
3203 type_t *type = parse_typename();
3206 expression_t *value = parse_sub_expression(20);
3208 check_cast_allowed(value, type);
3210 cast->base.datatype = type;
3211 cast->unary.value = value;
3216 static expression_t *parse_statement_expression(void)
3218 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3220 statement_t *statement = parse_compound_statement();
3221 expression->statement.statement = statement;
3222 if(statement == NULL) {
3227 assert(statement->kind == STATEMENT_COMPOUND);
3228 compound_statement_t *compound_statement = &statement->compound;
3230 /* find last statement and use it's type */
3231 const statement_t *last_statement = NULL;
3232 const statement_t *iter = compound_statement->statements;
3233 for( ; iter != NULL; iter = iter->base.next) {
3234 last_statement = iter;
3237 if(last_statement->kind == STATEMENT_EXPRESSION) {
3238 const expression_statement_t *expression_statement
3239 = &last_statement->expression;
3240 expression->base.datatype
3241 = expression_statement->expression->base.datatype;
3243 expression->base.datatype = type_void;
3251 static expression_t *parse_brace_expression(void)
3255 switch(token.type) {
3257 /* gcc extension: a statement expression */
3258 return parse_statement_expression();
3262 return parse_cast();
3264 if(is_typedef_symbol(token.v.symbol)) {
3265 return parse_cast();
3269 expression_t *result = parse_expression();
3275 static expression_t *parse_function_keyword(void)
3280 if (current_function == NULL) {
3281 errorf(HERE, "'__func__' used outside of a function");
3284 string_literal_expression_t *expression
3285 = allocate_ast_zero(sizeof(expression[0]));
3287 expression->expression.kind = EXPR_FUNCTION;
3288 expression->expression.datatype = type_string;
3289 expression->value = current_function->symbol->string;
3291 return (expression_t*) expression;
3294 static expression_t *parse_pretty_function_keyword(void)
3296 eat(T___PRETTY_FUNCTION__);
3299 if (current_function == NULL) {
3300 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3303 string_literal_expression_t *expression
3304 = allocate_ast_zero(sizeof(expression[0]));
3306 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3307 expression->expression.datatype = type_string;
3308 expression->value = current_function->symbol->string;
3310 return (expression_t*) expression;
3313 static designator_t *parse_designator(void)
3315 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3317 if(token.type != T_IDENTIFIER) {
3318 parse_error_expected("while parsing member designator",
3323 result->symbol = token.v.symbol;
3326 designator_t *last_designator = result;
3328 if(token.type == '.') {
3330 if(token.type != T_IDENTIFIER) {
3331 parse_error_expected("while parsing member designator",
3336 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3337 designator->symbol = token.v.symbol;
3340 last_designator->next = designator;
3341 last_designator = designator;
3344 if(token.type == '[') {
3346 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3347 designator->array_access = parse_expression();
3348 if(designator->array_access == NULL) {
3354 last_designator->next = designator;
3355 last_designator = designator;
3364 static expression_t *parse_offsetof(void)
3366 eat(T___builtin_offsetof);
3368 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3369 expression->base.datatype = type_size_t;
3372 expression->offsetofe.type = parse_typename();
3374 expression->offsetofe.designator = parse_designator();
3380 static expression_t *parse_va_start(void)
3382 eat(T___builtin_va_start);
3384 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3387 expression->va_starte.ap = parse_assignment_expression();
3389 expression_t *const expr = parse_assignment_expression();
3390 if (expr->kind == EXPR_REFERENCE) {
3391 declaration_t *const decl = expr->reference.declaration;
3392 if (decl->parent_context == ¤t_function->context &&
3393 decl->next == NULL) {
3394 expression->va_starte.parameter = decl;
3399 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3401 return create_invalid_expression();
3404 static expression_t *parse_va_arg(void)
3406 eat(T___builtin_va_arg);
3408 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3411 expression->va_arge.ap = parse_assignment_expression();
3413 expression->base.datatype = parse_typename();
3419 static expression_t *parse_builtin_symbol(void)
3421 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3423 symbol_t *symbol = token.v.symbol;
3425 expression->builtin_symbol.symbol = symbol;
3428 type_t *type = get_builtin_symbol_type(symbol);
3429 type = automatic_type_conversion(type);
3431 expression->base.datatype = type;
3435 static expression_t *parse_builtin_constant(void)
3437 eat(T___builtin_constant_p);
3439 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3442 expression->builtin_constant.value = parse_assignment_expression();
3444 expression->base.datatype = type_int;
3449 static expression_t *parse_builtin_prefetch(void)
3451 eat(T___builtin_prefetch);
3453 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3456 expression->builtin_prefetch.adr = parse_assignment_expression();
3457 if (token.type == ',') {
3459 expression->builtin_prefetch.rw = parse_assignment_expression();
3461 if (token.type == ',') {
3463 expression->builtin_prefetch.locality = parse_assignment_expression();
3466 expression->base.datatype = type_void;
3471 static expression_t *parse_compare_builtin(void)
3473 expression_t *expression;
3475 switch(token.type) {
3476 case T___builtin_isgreater:
3477 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3479 case T___builtin_isgreaterequal:
3480 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3482 case T___builtin_isless:
3483 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3485 case T___builtin_islessequal:
3486 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3488 case T___builtin_islessgreater:
3489 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3491 case T___builtin_isunordered:
3492 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3495 panic("invalid compare builtin found");
3501 expression->binary.left = parse_assignment_expression();
3503 expression->binary.right = parse_assignment_expression();
3506 type_t *orig_type_left = expression->binary.left->base.datatype;
3507 type_t *orig_type_right = expression->binary.right->base.datatype;
3508 if(orig_type_left == NULL || orig_type_right == NULL)
3511 type_t *type_left = skip_typeref(orig_type_left);
3512 type_t *type_right = skip_typeref(orig_type_right);
3513 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3514 type_error_incompatible("invalid operands in comparison",
3515 token.source_position, type_left, type_right);
3517 semantic_comparison(&expression->binary);
3523 static expression_t *parse_builtin_expect(void)
3525 eat(T___builtin_expect);
3527 expression_t *expression
3528 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3531 expression->binary.left = parse_assignment_expression();
3533 expression->binary.right = parse_constant_expression();
3536 expression->base.datatype = expression->binary.left->base.datatype;
3541 static expression_t *parse_assume(void) {
3544 expression_t *expression
3545 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3548 expression->unary.value = parse_assignment_expression();
3551 expression->base.datatype = type_void;
3555 static expression_t *parse_alignof(void) {
3558 expression_t *expression
3559 = allocate_expression_zero(EXPR_ALIGNOF);
3562 expression->alignofe.type = parse_typename();
3565 expression->base.datatype = type_size_t;
3569 static expression_t *parse_primary_expression(void)
3571 switch(token.type) {
3573 return parse_int_const();
3574 case T_FLOATINGPOINT:
3575 return parse_float_const();
3576 case T_STRING_LITERAL:
3577 return parse_string_const();
3578 case T_WIDE_STRING_LITERAL:
3579 return parse_wide_string_const();
3581 return parse_reference();
3582 case T___FUNCTION__:
3584 return parse_function_keyword();
3585 case T___PRETTY_FUNCTION__:
3586 return parse_pretty_function_keyword();
3587 case T___builtin_offsetof:
3588 return parse_offsetof();
3589 case T___builtin_va_start:
3590 return parse_va_start();
3591 case T___builtin_va_arg:
3592 return parse_va_arg();
3593 case T___builtin_expect:
3594 return parse_builtin_expect();
3595 case T___builtin_nanf:
3596 case T___builtin_alloca:
3597 case T___builtin_va_end:
3598 return parse_builtin_symbol();
3599 case T___builtin_isgreater:
3600 case T___builtin_isgreaterequal:
3601 case T___builtin_isless:
3602 case T___builtin_islessequal:
3603 case T___builtin_islessgreater:
3604 case T___builtin_isunordered:
3605 return parse_compare_builtin();
3606 case T___builtin_constant_p:
3607 return parse_builtin_constant();
3608 case T___builtin_prefetch:
3609 return parse_builtin_prefetch();
3611 return parse_alignof();
3613 return parse_assume();
3616 return parse_brace_expression();
3619 errorf(HERE, "unexpected token '%K'", &token);
3622 return create_invalid_expression();
3626 * Check if the expression has the character type and issue a warning then.
3628 static void check_for_char_index_type(const expression_t *expression) {
3629 type_t *type = expression->base.datatype;
3630 type_t *base_type = skip_typeref(type);
3632 if (base_type->base.kind == TYPE_ATOMIC) {
3633 if (base_type->atomic.akind == ATOMIC_TYPE_CHAR) {
3634 warningf(expression->base.source_position,
3635 "array subscript has type '%T'", type);
3640 static expression_t *parse_array_expression(unsigned precedence,
3647 expression_t *inside = parse_expression();
3649 array_access_expression_t *array_access
3650 = allocate_ast_zero(sizeof(array_access[0]));
3652 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3654 type_t *type_left = left->base.datatype;
3655 type_t *type_inside = inside->base.datatype;
3656 type_t *return_type = NULL;
3658 if(type_left != NULL && type_inside != NULL) {
3659 type_left = skip_typeref(type_left);
3660 type_inside = skip_typeref(type_inside);
3662 if(is_type_pointer(type_left)) {
3663 pointer_type_t *pointer = &type_left->pointer;
3664 return_type = pointer->points_to;
3665 array_access->array_ref = left;
3666 array_access->index = inside;
3667 check_for_char_index_type(inside);
3668 } else if(is_type_pointer(type_inside)) {
3669 pointer_type_t *pointer = &type_inside->pointer;
3670 return_type = pointer->points_to;
3671 array_access->array_ref = inside;
3672 array_access->index = left;
3673 array_access->flipped = true;
3674 check_for_char_index_type(left);
3676 errorf(HERE, "array access on object with non-pointer types '%T', '%T'", type_left, type_inside);
3679 array_access->array_ref = left;
3680 array_access->index = inside;
3683 if(token.type != ']') {
3684 parse_error_expected("Problem while parsing array access", ']', 0);
3685 return (expression_t*) array_access;
3689 return_type = automatic_type_conversion(return_type);
3690 array_access->expression.datatype = return_type;
3692 return (expression_t*) array_access;
3695 static expression_t *parse_sizeof(unsigned precedence)
3699 sizeof_expression_t *sizeof_expression
3700 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3701 sizeof_expression->expression.kind = EXPR_SIZEOF;
3702 sizeof_expression->expression.datatype = type_size_t;
3704 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3706 sizeof_expression->type = parse_typename();
3709 expression_t *expression = parse_sub_expression(precedence);
3710 expression->base.datatype = revert_automatic_type_conversion(expression);
3712 sizeof_expression->type = expression->base.datatype;
3713 sizeof_expression->size_expression = expression;
3716 return (expression_t*) sizeof_expression;
3719 static expression_t *parse_select_expression(unsigned precedence,
3720 expression_t *compound)
3723 assert(token.type == '.' || token.type == T_MINUSGREATER);
3725 bool is_pointer = (token.type == T_MINUSGREATER);
3728 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3729 select->select.compound = compound;
3731 if(token.type != T_IDENTIFIER) {
3732 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3735 symbol_t *symbol = token.v.symbol;
3736 select->select.symbol = symbol;
3739 type_t *orig_type = compound->base.datatype;
3740 if(orig_type == NULL)
3741 return create_invalid_expression();
3743 type_t *type = skip_typeref(orig_type);
3745 type_t *type_left = type;
3747 if(type->kind != TYPE_POINTER) {
3748 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3749 return create_invalid_expression();
3751 pointer_type_t *pointer_type = &type->pointer;
3752 type_left = pointer_type->points_to;
3754 type_left = skip_typeref(type_left);
3756 if(type_left->kind != TYPE_COMPOUND_STRUCT
3757 && type_left->kind != TYPE_COMPOUND_UNION) {
3758 errorf(HERE, "request for member '%Y' in something not a struct or "
3759 "union, but '%T'", symbol, type_left);
3760 return create_invalid_expression();
3763 compound_type_t *compound_type = &type_left->compound;
3764 declaration_t *declaration = compound_type->declaration;
3766 if(!declaration->init.is_defined) {
3767 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3769 return create_invalid_expression();
3772 declaration_t *iter = declaration->context.declarations;
3773 for( ; iter != NULL; iter = iter->next) {
3774 if(iter->symbol == symbol) {
3779 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3780 return create_invalid_expression();
3783 /* we always do the auto-type conversions; the & and sizeof parser contains
3784 * code to revert this! */
3785 type_t *expression_type = automatic_type_conversion(iter->type);
3787 select->select.compound_entry = iter;
3788 select->base.datatype = expression_type;
3790 if(expression_type->kind == TYPE_BITFIELD) {
3791 expression_t *extract
3792 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3793 extract->unary.value = select;
3794 extract->base.datatype = expression_type->bitfield.base;
3803 * Parse a call expression, ie. expression '( ... )'.
3805 * @param expression the function address
3807 static expression_t *parse_call_expression(unsigned precedence,
3808 expression_t *expression)
3811 expression_t *result = allocate_expression_zero(EXPR_CALL);
3813 call_expression_t *call = &result->call;
3814 call->function = expression;
3816 function_type_t *function_type = NULL;
3817 type_t *orig_type = expression->base.datatype;
3818 if(orig_type != NULL) {
3819 type_t *type = skip_typeref(orig_type);
3821 if(is_type_pointer(type)) {
3822 pointer_type_t *pointer_type = &type->pointer;
3824 type = skip_typeref(pointer_type->points_to);
3826 if (is_type_function(type)) {
3827 function_type = &type->function;
3828 call->expression.datatype = function_type->return_type;
3831 if(function_type == NULL) {
3832 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3834 function_type = NULL;
3835 call->expression.datatype = NULL;
3839 /* parse arguments */
3842 if(token.type != ')') {
3843 call_argument_t *last_argument = NULL;
3846 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3848 argument->expression = parse_assignment_expression();
3849 if(last_argument == NULL) {
3850 call->arguments = argument;
3852 last_argument->next = argument;
3854 last_argument = argument;
3856 if(token.type != ',')
3863 if(function_type != NULL) {
3864 function_parameter_t *parameter = function_type->parameters;
3865 call_argument_t *argument = call->arguments;
3866 for( ; parameter != NULL && argument != NULL;
3867 parameter = parameter->next, argument = argument->next) {
3868 type_t *expected_type = parameter->type;
3869 /* TODO report context in error messages */
3870 argument->expression = create_implicit_cast(argument->expression,
3873 /* too few parameters */
3874 if(parameter != NULL) {
3875 errorf(HERE, "too few arguments to function '%E'", expression);
3876 } else if(argument != NULL) {
3877 /* too many parameters */
3878 if(!function_type->variadic
3879 && !function_type->unspecified_parameters) {
3880 errorf(HERE, "too many arguments to function '%E'", expression);
3882 /* do default promotion */
3883 for( ; argument != NULL; argument = argument->next) {
3884 type_t *type = argument->expression->base.datatype;
3889 type = skip_typeref(type);
3890 if(is_type_integer(type)) {
3891 type = promote_integer(type);
3892 } else if(type == type_float) {
3896 argument->expression
3897 = create_implicit_cast(argument->expression, type);
3900 check_format(&result->call);
3903 check_format(&result->call);
3910 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3912 static bool same_compound_type(const type_t *type1, const type_t *type2)
3914 if(!is_type_compound(type1))
3916 if(type1->kind != type2->kind)
3919 const compound_type_t *compound1 = &type1->compound;
3920 const compound_type_t *compound2 = &type2->compound;
3922 return compound1->declaration == compound2->declaration;
3926 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3928 * @param expression the conditional expression
3930 static expression_t *parse_conditional_expression(unsigned precedence,
3931 expression_t *expression)
3935 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3937 conditional_expression_t *conditional = &result->conditional;
3938 conditional->condition = expression;
3941 type_t *condition_type_orig = expression->base.datatype;
3942 if(condition_type_orig != NULL) {
3943 type_t *condition_type = skip_typeref(condition_type_orig);
3944 if(condition_type != NULL && !is_type_scalar(condition_type)) {
3945 type_error("expected a scalar type in conditional condition",
3946 expression->base.source_position, condition_type_orig);
3950 expression_t *true_expression = parse_expression();
3952 expression_t *false_expression = parse_sub_expression(precedence);
3954 conditional->true_expression = true_expression;
3955 conditional->false_expression = false_expression;
3957 type_t *orig_true_type = true_expression->base.datatype;
3958 type_t *orig_false_type = false_expression->base.datatype;
3959 if(orig_true_type == NULL || orig_false_type == NULL)
3962 type_t *true_type = skip_typeref(orig_true_type);
3963 type_t *false_type = skip_typeref(orig_false_type);
3966 type_t *result_type = NULL;
3967 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3968 result_type = semantic_arithmetic(true_type, false_type);
3970 true_expression = create_implicit_cast(true_expression, result_type);
3971 false_expression = create_implicit_cast(false_expression, result_type);
3973 conditional->true_expression = true_expression;
3974 conditional->false_expression = false_expression;
3975 conditional->expression.datatype = result_type;
3976 } else if (same_compound_type(true_type, false_type)
3977 || (is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3978 is_type_atomic(false_type, ATOMIC_TYPE_VOID))) {
3979 /* just take 1 of the 2 types */
3980 result_type = true_type;
3981 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3982 && pointers_compatible(true_type, false_type)) {
3984 result_type = true_type;
3987 type_error_incompatible("while parsing conditional",
3988 expression->base.source_position, true_type,
3992 conditional->expression.datatype = result_type;
3997 * Parse an extension expression.
3999 static expression_t *parse_extension(unsigned precedence)
4001 eat(T___extension__);
4003 /* TODO enable extensions */
4004 expression_t *expression = parse_sub_expression(precedence);
4005 /* TODO disable extensions */
4009 static expression_t *parse_builtin_classify_type(const unsigned precedence)
4011 eat(T___builtin_classify_type);
4013 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
4014 result->base.datatype = type_int;
4017 expression_t *expression = parse_sub_expression(precedence);
4019 result->classify_type.type_expression = expression;
4024 static void semantic_incdec(unary_expression_t *expression)
4026 type_t *orig_type = expression->value->base.datatype;
4027 if(orig_type == NULL)
4030 type_t *type = skip_typeref(orig_type);
4031 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
4032 /* TODO: improve error message */
4033 errorf(HERE, "operation needs an arithmetic or pointer type");
4037 expression->expression.datatype = orig_type;
4040 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
4042 type_t *orig_type = expression->value->base.datatype;
4043 if(orig_type == NULL)
4046 type_t *type = skip_typeref(orig_type);
4047 if(!is_type_arithmetic(type)) {
4048 /* TODO: improve error message */
4049 errorf(HERE, "operation needs an arithmetic type");
4053 expression->expression.datatype = orig_type;
4056 static void semantic_unexpr_scalar(unary_expression_t *expression)
4058 type_t *orig_type = expression->value->base.datatype;
4059 if(orig_type == NULL)
4062 type_t *type = skip_typeref(orig_type);
4063 if (!is_type_scalar(type)) {
4064 errorf(HERE, "operand of ! must be of scalar type");
4068 expression->expression.datatype = orig_type;
4071 static void semantic_unexpr_integer(unary_expression_t *expression)
4073 type_t *orig_type = expression->value->base.datatype;
4074 if(orig_type == NULL)
4077 type_t *type = skip_typeref(orig_type);
4078 if (!is_type_integer(type)) {
4079 errorf(HERE, "operand of ~ must be of integer type");
4083 expression->expression.datatype = orig_type;
4086 static void semantic_dereference(unary_expression_t *expression)
4088 type_t *orig_type = expression->value->base.datatype;
4089 if(orig_type == NULL)
4092 type_t *type = skip_typeref(orig_type);
4093 if(!is_type_pointer(type)) {
4094 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4098 pointer_type_t *pointer_type = &type->pointer;
4099 type_t *result_type = pointer_type->points_to;
4101 result_type = automatic_type_conversion(result_type);
4102 expression->expression.datatype = result_type;
4106 * Check the semantic of the address taken expression.
4108 static void semantic_take_addr(unary_expression_t *expression)
4110 expression_t *value = expression->value;
4111 value->base.datatype = revert_automatic_type_conversion(value);
4113 type_t *orig_type = value->base.datatype;
4114 if(orig_type == NULL)
4117 if(value->kind == EXPR_REFERENCE) {
4118 reference_expression_t *reference = (reference_expression_t*) value;
4119 declaration_t *declaration = reference->declaration;
4120 if(declaration != NULL) {
4121 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4122 errorf(expression->expression.source_position,
4123 "address of register variable '%Y' requested",
4124 declaration->symbol);
4126 declaration->address_taken = 1;
4130 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4133 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4134 static expression_t *parse_##unexpression_type(unsigned precedence) \
4138 expression_t *unary_expression \
4139 = allocate_expression_zero(unexpression_type); \
4140 unary_expression->base.source_position = HERE; \
4141 unary_expression->unary.value = parse_sub_expression(precedence); \
4143 sfunc(&unary_expression->unary); \
4145 return unary_expression; \
4148 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4149 semantic_unexpr_arithmetic)
4150 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4151 semantic_unexpr_arithmetic)
4152 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4153 semantic_unexpr_scalar)
4154 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4155 semantic_dereference)
4156 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4158 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4159 semantic_unexpr_integer)
4160 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4162 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4165 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4167 static expression_t *parse_##unexpression_type(unsigned precedence, \
4168 expression_t *left) \
4170 (void) precedence; \
4173 expression_t *unary_expression \
4174 = allocate_expression_zero(unexpression_type); \
4175 unary_expression->unary.value = left; \
4177 sfunc(&unary_expression->unary); \
4179 return unary_expression; \
4182 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4183 EXPR_UNARY_POSTFIX_INCREMENT,
4185 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4186 EXPR_UNARY_POSTFIX_DECREMENT,
4189 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4191 /* TODO: handle complex + imaginary types */
4193 /* § 6.3.1.8 Usual arithmetic conversions */
4194 if(type_left == type_long_double || type_right == type_long_double) {
4195 return type_long_double;
4196 } else if(type_left == type_double || type_right == type_double) {
4198 } else if(type_left == type_float || type_right == type_float) {
4202 type_right = promote_integer(type_right);
4203 type_left = promote_integer(type_left);
4205 if(type_left == type_right)
4208 bool signed_left = is_type_signed(type_left);
4209 bool signed_right = is_type_signed(type_right);
4210 int rank_left = get_rank(type_left);
4211 int rank_right = get_rank(type_right);
4212 if(rank_left < rank_right) {
4213 if(signed_left == signed_right || !signed_right) {
4219 if(signed_left == signed_right || !signed_left) {
4228 * Check the semantic restrictions for a binary expression.
4230 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4232 expression_t *left = expression->left;
4233 expression_t *right = expression->right;
4234 type_t *orig_type_left = left->base.datatype;
4235 type_t *orig_type_right = right->base.datatype;
4237 if(orig_type_left == NULL || orig_type_right == NULL)
4240 type_t *type_left = skip_typeref(orig_type_left);
4241 type_t *type_right = skip_typeref(orig_type_right);
4243 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4244 /* TODO: improve error message */
4245 errorf(HERE, "operation needs arithmetic types");
4249 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4250 expression->left = create_implicit_cast(left, arithmetic_type);
4251 expression->right = create_implicit_cast(right, arithmetic_type);
4252 expression->expression.datatype = arithmetic_type;
4255 static void semantic_shift_op(binary_expression_t *expression)
4257 expression_t *left = expression->left;
4258 expression_t *right = expression->right;
4259 type_t *orig_type_left = left->base.datatype;
4260 type_t *orig_type_right = right->base.datatype;
4262 if(orig_type_left == NULL || orig_type_right == NULL)
4265 type_t *type_left = skip_typeref(orig_type_left);
4266 type_t *type_right = skip_typeref(orig_type_right);
4268 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4269 /* TODO: improve error message */
4270 errorf(HERE, "operation needs integer types");
4274 type_left = promote_integer(type_left);
4275 type_right = promote_integer(type_right);
4277 expression->left = create_implicit_cast(left, type_left);
4278 expression->right = create_implicit_cast(right, type_right);
4279 expression->expression.datatype = type_left;
4282 static void semantic_add(binary_expression_t *expression)
4284 expression_t *left = expression->left;
4285 expression_t *right = expression->right;
4286 type_t *orig_type_left = left->base.datatype;
4287 type_t *orig_type_right = right->base.datatype;
4289 if(orig_type_left == NULL || orig_type_right == NULL)
4292 type_t *type_left = skip_typeref(orig_type_left);
4293 type_t *type_right = skip_typeref(orig_type_right);
4296 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4297 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4298 expression->left = create_implicit_cast(left, arithmetic_type);
4299 expression->right = create_implicit_cast(right, arithmetic_type);
4300 expression->expression.datatype = arithmetic_type;
4302 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4303 expression->expression.datatype = type_left;
4304 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4305 expression->expression.datatype = type_right;
4307 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4311 static void semantic_sub(binary_expression_t *expression)
4313 expression_t *left = expression->left;
4314 expression_t *right = expression->right;
4315 type_t *orig_type_left = left->base.datatype;
4316 type_t *orig_type_right = right->base.datatype;
4318 if(orig_type_left == NULL || orig_type_right == NULL)
4321 type_t *type_left = skip_typeref(orig_type_left);
4322 type_t *type_right = skip_typeref(orig_type_right);
4325 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4326 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4327 expression->left = create_implicit_cast(left, arithmetic_type);
4328 expression->right = create_implicit_cast(right, arithmetic_type);
4329 expression->expression.datatype = arithmetic_type;
4331 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4332 expression->expression.datatype = type_left;
4333 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4334 if(!pointers_compatible(type_left, type_right)) {
4335 errorf(HERE, "pointers to incompatible objects to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4337 expression->expression.datatype = type_ptrdiff_t;
4340 errorf(HERE, "invalid operands to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4344 static void semantic_comparison(binary_expression_t *expression)
4346 expression_t *left = expression->left;
4347 expression_t *right = expression->right;
4348 type_t *orig_type_left = left->base.datatype;
4349 type_t *orig_type_right = right->base.datatype;
4351 if(orig_type_left == NULL || orig_type_right == NULL)
4354 type_t *type_left = skip_typeref(orig_type_left);
4355 type_t *type_right = skip_typeref(orig_type_right);
4357 /* TODO non-arithmetic types */
4358 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4359 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4360 expression->left = create_implicit_cast(left, arithmetic_type);
4361 expression->right = create_implicit_cast(right, arithmetic_type);
4362 expression->expression.datatype = arithmetic_type;
4363 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4364 /* TODO check compatibility */
4365 } else if (is_type_pointer(type_left)) {
4366 expression->right = create_implicit_cast(right, type_left);
4367 } else if (is_type_pointer(type_right)) {
4368 expression->left = create_implicit_cast(left, type_right);
4370 type_error_incompatible("invalid operands in comparison",
4371 token.source_position, type_left, type_right);
4373 expression->expression.datatype = type_int;
4376 static void semantic_arithmetic_assign(binary_expression_t *expression)
4378 expression_t *left = expression->left;
4379 expression_t *right = expression->right;
4380 type_t *orig_type_left = left->base.datatype;
4381 type_t *orig_type_right = right->base.datatype;
4383 if(orig_type_left == NULL || orig_type_right == NULL)
4386 type_t *type_left = skip_typeref(orig_type_left);
4387 type_t *type_right = skip_typeref(orig_type_right);
4389 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4390 /* TODO: improve error message */
4391 errorf(HERE, "operation needs arithmetic types");
4395 /* combined instructions are tricky. We can't create an implicit cast on
4396 * the left side, because we need the uncasted form for the store.
4397 * The ast2firm pass has to know that left_type must be right_type
4398 * for the arithmetic operation and create a cast by itself */
4399 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4400 expression->right = create_implicit_cast(right, arithmetic_type);
4401 expression->expression.datatype = type_left;
4404 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4406 expression_t *left = expression->left;
4407 expression_t *right = expression->right;
4408 type_t *orig_type_left = left->base.datatype;
4409 type_t *orig_type_right = right->base.datatype;
4411 if(orig_type_left == NULL || orig_type_right == NULL)
4414 type_t *type_left = skip_typeref(orig_type_left);
4415 type_t *type_right = skip_typeref(orig_type_right);
4417 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4418 /* combined instructions are tricky. We can't create an implicit cast on
4419 * the left side, because we need the uncasted form for the store.
4420 * The ast2firm pass has to know that left_type must be right_type
4421 * for the arithmetic operation and create a cast by itself */
4422 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4423 expression->right = create_implicit_cast(right, arithmetic_type);
4424 expression->expression.datatype = type_left;
4425 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4426 expression->expression.datatype = type_left;
4428 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4434 * Check the semantic restrictions of a logical expression.
4436 static void semantic_logical_op(binary_expression_t *expression)
4438 expression_t *left = expression->left;
4439 expression_t *right = expression->right;
4440 type_t *orig_type_left = left->base.datatype;
4441 type_t *orig_type_right = right->base.datatype;
4443 if(orig_type_left == NULL || orig_type_right == NULL)
4446 type_t *type_left = skip_typeref(orig_type_left);
4447 type_t *type_right = skip_typeref(orig_type_right);
4449 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4450 /* TODO: improve error message */
4451 errorf(HERE, "operation needs scalar types");
4455 expression->expression.datatype = type_int;
4459 * Checks if a compound type has constant fields.
4461 static bool has_const_fields(const compound_type_t *type)
4463 const context_t *context = &type->declaration->context;
4464 const declaration_t *declaration = context->declarations;
4466 for (; declaration != NULL; declaration = declaration->next) {
4467 if (declaration->namespc != NAMESPACE_NORMAL)
4470 const type_t *decl_type = skip_typeref(declaration->type);
4471 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4479 * Check the semantic restrictions of a binary assign expression.
4481 static void semantic_binexpr_assign(binary_expression_t *expression)
4483 expression_t *left = expression->left;
4484 type_t *orig_type_left = left->base.datatype;
4486 if(orig_type_left == NULL)
4489 type_t *type_left = revert_automatic_type_conversion(left);
4490 type_left = skip_typeref(orig_type_left);
4492 /* must be a modifiable lvalue */
4493 if (is_type_array(type_left)) {
4494 errorf(HERE, "cannot assign to arrays ('%E')", left);
4497 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4498 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4502 if(is_type_incomplete(type_left)) {
4504 "left-hand side of assignment '%E' has incomplete type '%T'",
4505 left, orig_type_left);
4508 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4509 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4510 left, orig_type_left);
4514 semantic_assign(orig_type_left, &expression->right, "assignment");
4516 expression->expression.datatype = orig_type_left;
4519 static void semantic_comma(binary_expression_t *expression)
4521 expression->expression.datatype = expression->right->base.datatype;
4524 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4525 static expression_t *parse_##binexpression_type(unsigned precedence, \
4526 expression_t *left) \
4530 expression_t *right = parse_sub_expression(precedence + lr); \
4532 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4533 binexpr->binary.left = left; \
4534 binexpr->binary.right = right; \
4535 sfunc(&binexpr->binary); \
4540 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4541 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4542 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4543 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4544 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4545 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4546 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4547 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4548 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4550 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4551 semantic_comparison, 1)
4552 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4553 semantic_comparison, 1)
4554 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4555 semantic_comparison, 1)
4556 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4557 semantic_comparison, 1)
4559 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4560 semantic_binexpr_arithmetic, 1)
4561 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4562 semantic_binexpr_arithmetic, 1)
4563 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4564 semantic_binexpr_arithmetic, 1)
4565 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4566 semantic_logical_op, 1)
4567 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4568 semantic_logical_op, 1)
4569 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4570 semantic_shift_op, 1)
4571 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4572 semantic_shift_op, 1)
4573 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4574 semantic_arithmetic_addsubb_assign, 0)
4575 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4576 semantic_arithmetic_addsubb_assign, 0)
4577 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4578 semantic_arithmetic_assign, 0)
4579 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4580 semantic_arithmetic_assign, 0)
4581 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4582 semantic_arithmetic_assign, 0)
4583 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4584 semantic_arithmetic_assign, 0)
4585 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4586 semantic_arithmetic_assign, 0)
4587 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4588 semantic_arithmetic_assign, 0)
4589 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4590 semantic_arithmetic_assign, 0)
4591 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4592 semantic_arithmetic_assign, 0)
4594 static expression_t *parse_sub_expression(unsigned precedence)
4596 if(token.type < 0) {
4597 return expected_expression_error();
4600 expression_parser_function_t *parser
4601 = &expression_parsers[token.type];
4602 source_position_t source_position = token.source_position;
4605 if(parser->parser != NULL) {
4606 left = parser->parser(parser->precedence);
4608 left = parse_primary_expression();
4610 assert(left != NULL);
4611 left->base.source_position = source_position;
4614 if(token.type < 0) {
4615 return expected_expression_error();
4618 parser = &expression_parsers[token.type];
4619 if(parser->infix_parser == NULL)
4621 if(parser->infix_precedence < precedence)
4624 left = parser->infix_parser(parser->infix_precedence, left);
4626 assert(left != NULL);
4627 assert(left->kind != EXPR_UNKNOWN);
4628 left->base.source_position = source_position;
4635 * Parse an expression.
4637 static expression_t *parse_expression(void)
4639 return parse_sub_expression(1);
4643 * Register a parser for a prefix-like operator with given precedence.
4645 * @param parser the parser function
4646 * @param token_type the token type of the prefix token
4647 * @param precedence the precedence of the operator
4649 static void register_expression_parser(parse_expression_function parser,
4650 int token_type, unsigned precedence)
4652 expression_parser_function_t *entry = &expression_parsers[token_type];
4654 if(entry->parser != NULL) {
4655 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4656 panic("trying to register multiple expression parsers for a token");
4658 entry->parser = parser;
4659 entry->precedence = precedence;
4663 * Register a parser for an infix operator with given precedence.
4665 * @param parser the parser function
4666 * @param token_type the token type of the infix operator
4667 * @param precedence the precedence of the operator
4669 static void register_infix_parser(parse_expression_infix_function parser,
4670 int token_type, unsigned precedence)
4672 expression_parser_function_t *entry = &expression_parsers[token_type];
4674 if(entry->infix_parser != NULL) {
4675 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4676 panic("trying to register multiple infix expression parsers for a "
4679 entry->infix_parser = parser;
4680 entry->infix_precedence = precedence;
4684 * Initialize the expression parsers.
4686 static void init_expression_parsers(void)
4688 memset(&expression_parsers, 0, sizeof(expression_parsers));
4690 register_infix_parser(parse_array_expression, '[', 30);
4691 register_infix_parser(parse_call_expression, '(', 30);
4692 register_infix_parser(parse_select_expression, '.', 30);
4693 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4694 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4696 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4699 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4700 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4701 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4702 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4703 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4704 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4705 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4706 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4707 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4708 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4709 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4710 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4711 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4712 T_EXCLAMATIONMARKEQUAL, 13);
4713 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4714 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4715 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4716 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4717 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4718 register_infix_parser(parse_conditional_expression, '?', 7);
4719 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4720 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4721 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4722 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4723 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4724 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4725 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4726 T_LESSLESSEQUAL, 2);
4727 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4728 T_GREATERGREATEREQUAL, 2);
4729 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4731 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4733 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4736 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4738 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4739 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4740 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4741 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4742 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4743 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4744 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4746 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4748 register_expression_parser(parse_sizeof, T_sizeof, 25);
4749 register_expression_parser(parse_extension, T___extension__, 25);
4750 register_expression_parser(parse_builtin_classify_type,
4751 T___builtin_classify_type, 25);
4755 * Parse a asm statement constraints specification.
4757 static asm_constraint_t *parse_asm_constraints(void)
4759 asm_constraint_t *result = NULL;
4760 asm_constraint_t *last = NULL;
4762 while(token.type == T_STRING_LITERAL || token.type == '[') {
4763 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4764 memset(constraint, 0, sizeof(constraint[0]));
4766 if(token.type == '[') {
4768 if(token.type != T_IDENTIFIER) {
4769 parse_error_expected("while parsing asm constraint",
4773 constraint->symbol = token.v.symbol;
4778 constraint->constraints = parse_string_literals();
4780 constraint->expression = parse_expression();
4784 last->next = constraint;
4786 result = constraint;
4790 if(token.type != ',')
4799 * Parse a asm statement clobber specification.
4801 static asm_clobber_t *parse_asm_clobbers(void)
4803 asm_clobber_t *result = NULL;
4804 asm_clobber_t *last = NULL;
4806 while(token.type == T_STRING_LITERAL) {
4807 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4808 clobber->clobber = parse_string_literals();
4811 last->next = clobber;
4817 if(token.type != ',')
4826 * Parse an asm statement.
4828 static statement_t *parse_asm_statement(void)
4832 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4833 statement->base.source_position = token.source_position;
4835 asm_statement_t *asm_statement = &statement->asms;
4837 if(token.type == T_volatile) {
4839 asm_statement->is_volatile = true;
4843 asm_statement->asm_text = parse_string_literals();
4845 if(token.type != ':')
4849 asm_statement->inputs = parse_asm_constraints();
4850 if(token.type != ':')
4854 asm_statement->outputs = parse_asm_constraints();
4855 if(token.type != ':')
4859 asm_statement->clobbers = parse_asm_clobbers();
4868 * Parse a case statement.
4870 static statement_t *parse_case_statement(void)
4874 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4876 statement->base.source_position = token.source_position;
4877 statement->case_label.expression = parse_expression();
4881 if (! is_constant_expression(statement->case_label.expression)) {
4882 errorf(statement->base.source_position,
4883 "case label does not reduce to an integer constant");
4885 /* TODO: check if the case label is already known */
4886 if (current_switch != NULL) {
4887 /* link all cases into the switch statement */
4888 if (current_switch->last_case == NULL) {
4889 current_switch->first_case =
4890 current_switch->last_case = &statement->case_label;
4892 current_switch->last_case->next = &statement->case_label;
4895 errorf(statement->base.source_position,
4896 "case label not within a switch statement");
4899 statement->case_label.label_statement = parse_statement();
4905 * Finds an existing default label of a switch statement.
4907 static case_label_statement_t *
4908 find_default_label(const switch_statement_t *statement)
4910 for (case_label_statement_t *label = statement->first_case;
4912 label = label->next) {
4913 if (label->expression == NULL)
4920 * Parse a default statement.
4922 static statement_t *parse_default_statement(void)
4926 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4928 statement->base.source_position = token.source_position;
4931 if (current_switch != NULL) {
4932 const case_label_statement_t *def_label = find_default_label(current_switch);
4933 if (def_label != NULL) {
4934 errorf(HERE, "multiple default labels in one switch");
4935 errorf(def_label->statement.source_position,
4936 "this is the first default label");
4938 /* link all cases into the switch statement */
4939 if (current_switch->last_case == NULL) {
4940 current_switch->first_case =
4941 current_switch->last_case = &statement->case_label;
4943 current_switch->last_case->next = &statement->case_label;
4947 errorf(statement->base.source_position,
4948 "'default' label not within a switch statement");
4950 statement->label.label_statement = parse_statement();
4956 * Return the declaration for a given label symbol or create a new one.
4958 static declaration_t *get_label(symbol_t *symbol)
4960 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4961 assert(current_function != NULL);
4962 /* if we found a label in the same function, then we already created the
4964 if(candidate != NULL
4965 && candidate->parent_context == ¤t_function->context) {
4969 /* otherwise we need to create a new one */
4970 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
4971 declaration->namespc = NAMESPACE_LABEL;
4972 declaration->symbol = symbol;
4974 label_push(declaration);
4980 * Parse a label statement.
4982 static statement_t *parse_label_statement(void)
4984 assert(token.type == T_IDENTIFIER);
4985 symbol_t *symbol = token.v.symbol;
4988 declaration_t *label = get_label(symbol);
4990 /* if source position is already set then the label is defined twice,
4991 * otherwise it was just mentioned in a goto so far */
4992 if(label->source_position.input_name != NULL) {
4993 errorf(HERE, "duplicate label '%Y'", symbol);
4994 errorf(label->source_position, "previous definition of '%Y' was here",
4997 label->source_position = token.source_position;
5000 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
5002 label_statement->statement.kind = STATEMENT_LABEL;
5003 label_statement->statement.source_position = token.source_position;
5004 label_statement->label = label;
5008 if(token.type == '}') {
5009 /* TODO only warn? */
5010 errorf(HERE, "label at end of compound statement");
5011 return (statement_t*) label_statement;
5013 label_statement->label_statement = parse_statement();
5016 return (statement_t*) label_statement;
5020 * Parse an if statement.
5022 static statement_t *parse_if(void)
5026 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5027 statement->statement.kind = STATEMENT_IF;
5028 statement->statement.source_position = token.source_position;
5031 statement->condition = parse_expression();
5034 statement->true_statement = parse_statement();
5035 if(token.type == T_else) {
5037 statement->false_statement = parse_statement();
5040 return (statement_t*) statement;
5044 * Parse a switch statement.
5046 static statement_t *parse_switch(void)
5050 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5051 statement->statement.kind = STATEMENT_SWITCH;
5052 statement->statement.source_position = token.source_position;
5055 expression_t *const expr = parse_expression();
5056 type_t *const type = promote_integer(skip_typeref(expr->base.datatype));
5057 statement->expression = create_implicit_cast(expr, type);
5060 switch_statement_t *rem = current_switch;
5061 current_switch = statement;
5062 statement->body = parse_statement();
5063 current_switch = rem;
5065 return (statement_t*) statement;
5068 static statement_t *parse_loop_body(statement_t *const loop)
5070 statement_t *const rem = current_loop;
5071 current_loop = loop;
5072 statement_t *const body = parse_statement();
5078 * Parse a while statement.
5080 static statement_t *parse_while(void)
5084 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5085 statement->statement.kind = STATEMENT_WHILE;
5086 statement->statement.source_position = token.source_position;
5089 statement->condition = parse_expression();
5092 statement->body = parse_loop_body((statement_t*)statement);
5094 return (statement_t*) statement;
5098 * Parse a do statement.
5100 static statement_t *parse_do(void)
5104 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5105 statement->statement.kind = STATEMENT_DO_WHILE;
5106 statement->statement.source_position = token.source_position;
5108 statement->body = parse_loop_body((statement_t*)statement);
5111 statement->condition = parse_expression();
5115 return (statement_t*) statement;
5119 * Parse a for statement.
5121 static statement_t *parse_for(void)
5125 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5126 statement->statement.kind = STATEMENT_FOR;
5127 statement->statement.source_position = token.source_position;
5131 int top = environment_top();
5132 context_t *last_context = context;
5133 set_context(&statement->context);
5135 if(token.type != ';') {
5136 if(is_declaration_specifier(&token, false)) {
5137 parse_declaration(record_declaration);
5139 statement->initialisation = parse_expression();
5146 if(token.type != ';') {
5147 statement->condition = parse_expression();
5150 if(token.type != ')') {
5151 statement->step = parse_expression();
5154 statement->body = parse_loop_body((statement_t*)statement);
5156 assert(context == &statement->context);
5157 set_context(last_context);
5158 environment_pop_to(top);
5160 return (statement_t*) statement;
5164 * Parse a goto statement.
5166 static statement_t *parse_goto(void)
5170 if(token.type != T_IDENTIFIER) {
5171 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5175 symbol_t *symbol = token.v.symbol;
5178 declaration_t *label = get_label(symbol);
5180 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5182 statement->statement.kind = STATEMENT_GOTO;
5183 statement->statement.source_position = token.source_position;
5185 statement->label = label;
5187 /* remember the goto's in a list for later checking */
5188 if (goto_last == NULL) {
5189 goto_first = goto_last = statement;
5191 goto_last->next = statement;
5196 return (statement_t*) statement;
5200 * Parse a continue statement.
5202 static statement_t *parse_continue(void)
5204 statement_t *statement;
5205 if (current_loop == NULL) {
5206 errorf(HERE, "continue statement not within loop");
5209 statement = allocate_ast_zero(sizeof(statement[0]));
5210 statement->kind = STATEMENT_CONTINUE;
5211 statement->base.source_position = token.source_position;
5221 * Parse a break statement.
5223 static statement_t *parse_break(void)
5225 statement_t *statement;
5226 if (current_switch == NULL && current_loop == NULL) {
5227 errorf(HERE, "break statement not within loop or switch");
5230 statement = allocate_ast_zero(sizeof(statement[0]));
5231 statement->kind = STATEMENT_BREAK;
5232 statement->base.source_position = token.source_position;
5242 * Check if a given declaration represents a local variable.
5244 static bool is_local_var_declaration(const declaration_t *declaration) {
5245 switch ((storage_class_tag_t) declaration->storage_class) {
5246 case STORAGE_CLASS_NONE:
5247 case STORAGE_CLASS_AUTO:
5248 case STORAGE_CLASS_REGISTER: {
5249 const type_t *type = skip_typeref(declaration->type);
5250 if(is_type_function(type)) {
5262 * Check if a given expression represents a local variable.
5264 static bool is_local_variable(const expression_t *expression)
5266 if (expression->base.kind != EXPR_REFERENCE) {
5269 const declaration_t *declaration = expression->reference.declaration;
5270 return is_local_var_declaration(declaration);
5274 * Parse a return statement.
5276 static statement_t *parse_return(void)
5280 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5282 statement->statement.kind = STATEMENT_RETURN;
5283 statement->statement.source_position = token.source_position;
5285 assert(is_type_function(current_function->type));
5286 function_type_t *function_type = ¤t_function->type->function;
5287 type_t *return_type = function_type->return_type;
5289 expression_t *return_value = NULL;
5290 if(token.type != ';') {
5291 return_value = parse_expression();
5295 if(return_type == NULL)
5296 return (statement_t*) statement;
5297 if(return_value != NULL && return_value->base.datatype == NULL)
5298 return (statement_t*) statement;
5300 return_type = skip_typeref(return_type);
5302 if(return_value != NULL) {
5303 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5305 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5306 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5307 warningf(statement->statement.source_position,
5308 "'return' with a value, in function returning void");
5309 return_value = NULL;
5311 if(return_type != NULL) {
5312 semantic_assign(return_type, &return_value, "'return'");
5315 /* check for returning address of a local var */
5316 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
5317 const expression_t *expression = return_value->unary.value;
5318 if (is_local_variable(expression)) {
5319 warningf(statement->statement.source_position,
5320 "function returns address of local variable");
5324 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5325 warningf(statement->statement.source_position,
5326 "'return' without value, in function returning non-void");
5329 statement->return_value = return_value;
5331 return (statement_t*) statement;
5335 * Parse a declaration statement.
5337 static statement_t *parse_declaration_statement(void)
5339 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5341 statement->base.source_position = token.source_position;
5343 declaration_t *before = last_declaration;
5344 parse_declaration(record_declaration);
5346 if(before == NULL) {
5347 statement->declaration.declarations_begin = context->declarations;
5349 statement->declaration.declarations_begin = before->next;
5351 statement->declaration.declarations_end = last_declaration;
5357 * Parse an expression statement, ie. expr ';'.
5359 static statement_t *parse_expression_statement(void)
5361 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5363 statement->base.source_position = token.source_position;
5364 statement->expression.expression = parse_expression();
5372 * Parse a statement.
5374 static statement_t *parse_statement(void)
5376 statement_t *statement = NULL;
5378 /* declaration or statement */
5379 switch(token.type) {
5381 statement = parse_asm_statement();
5385 statement = parse_case_statement();
5389 statement = parse_default_statement();
5393 statement = parse_compound_statement();
5397 statement = parse_if();
5401 statement = parse_switch();
5405 statement = parse_while();
5409 statement = parse_do();
5413 statement = parse_for();
5417 statement = parse_goto();
5421 statement = parse_continue();
5425 statement = parse_break();
5429 statement = parse_return();
5438 if(look_ahead(1)->type == ':') {
5439 statement = parse_label_statement();
5443 if(is_typedef_symbol(token.v.symbol)) {
5444 statement = parse_declaration_statement();
5448 statement = parse_expression_statement();
5451 case T___extension__:
5452 /* this can be a prefix to a declaration or an expression statement */
5453 /* we simply eat it now and parse the rest with tail recursion */
5456 } while(token.type == T___extension__);
5457 statement = parse_statement();
5461 statement = parse_declaration_statement();
5465 statement = parse_expression_statement();
5469 assert(statement == NULL
5470 || statement->base.source_position.input_name != NULL);
5476 * Parse a compound statement.
5478 static statement_t *parse_compound_statement(void)
5480 compound_statement_t *compound_statement
5481 = allocate_ast_zero(sizeof(compound_statement[0]));
5482 compound_statement->statement.kind = STATEMENT_COMPOUND;
5483 compound_statement->statement.source_position = token.source_position;
5487 int top = environment_top();
5488 context_t *last_context = context;
5489 set_context(&compound_statement->context);
5491 statement_t *last_statement = NULL;
5493 while(token.type != '}' && token.type != T_EOF) {
5494 statement_t *statement = parse_statement();
5495 if(statement == NULL)
5498 if(last_statement != NULL) {
5499 last_statement->base.next = statement;
5501 compound_statement->statements = statement;
5504 while(statement->base.next != NULL)
5505 statement = statement->base.next;
5507 last_statement = statement;
5510 if(token.type == '}') {
5513 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5516 assert(context == &compound_statement->context);
5517 set_context(last_context);
5518 environment_pop_to(top);
5520 return (statement_t*) compound_statement;
5524 * Initialize builtin types.
5526 static void initialize_builtin_types(void)
5528 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5529 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5530 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5531 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5532 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5533 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5534 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5535 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5537 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5538 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5539 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5540 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5544 * Parse a translation unit.
5546 static translation_unit_t *parse_translation_unit(void)
5548 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5550 assert(global_context == NULL);
5551 global_context = &unit->context;
5553 assert(context == NULL);
5554 set_context(&unit->context);
5556 initialize_builtin_types();
5558 while(token.type != T_EOF) {
5559 if (token.type == ';') {
5560 /* TODO error in strict mode */
5561 warningf(HERE, "stray ';' outside of function");
5564 parse_external_declaration();
5568 assert(context == &unit->context);
5570 last_declaration = NULL;
5572 assert(global_context == &unit->context);
5573 global_context = NULL;
5581 * @return the translation unit or NULL if errors occurred.
5583 translation_unit_t *parse(void)
5585 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5586 label_stack = NEW_ARR_F(stack_entry_t, 0);
5587 diagnostic_count = 0;
5591 type_set_output(stderr);
5592 ast_set_output(stderr);
5594 lookahead_bufpos = 0;
5595 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5598 translation_unit_t *unit = parse_translation_unit();
5600 DEL_ARR_F(environment_stack);
5601 DEL_ARR_F(label_stack);
5610 * Initialize the parser.
5612 void init_parser(void)
5614 init_expression_parsers();
5615 obstack_init(&temp_obst);
5617 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5618 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5622 * Terminate the parser.
5624 void exit_parser(void)
5626 obstack_free(&temp_obst, NULL);