7 #include "diagnostic.h"
8 #include "format_check.h"
14 #include "type_hash.h"
16 #include "adt/bitfiddle.h"
17 #include "adt/error.h"
18 #include "adt/array.h"
20 //#define PRINT_TOKENS
21 //#define ABORT_ON_ERROR
22 #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 struct obstack temp_obst;
52 static bool found_error;
54 static type_t *type_valist;
56 static statement_t *parse_compound_statement(void);
57 static statement_t *parse_statement(void);
59 static expression_t *parse_sub_expression(unsigned precedence);
60 static expression_t *parse_expression(void);
61 static type_t *parse_typename(void);
63 static void parse_compound_type_entries(void);
64 static declaration_t *parse_declarator(
65 const declaration_specifiers_t *specifiers, bool may_be_abstract);
66 static declaration_t *record_declaration(declaration_t *declaration);
68 static void semantic_comparison(binary_expression_t *expression);
70 #define STORAGE_CLASSES \
77 #define TYPE_QUALIFIERS \
84 #ifdef PROVIDE_COMPLEX
85 #define COMPLEX_SPECIFIERS \
87 #define IMAGINARY_SPECIFIERS \
90 #define COMPLEX_SPECIFIERS
91 #define IMAGINARY_SPECIFIERS
94 #define TYPE_SPECIFIERS \
109 case T___builtin_va_list: \
113 #define DECLARATION_START \
118 #define TYPENAME_START \
122 static void *allocate_ast_zero(size_t size)
124 void *res = allocate_ast(size);
125 memset(res, 0, size);
129 static size_t get_statement_struct_size(statement_kind_t kind)
131 static const size_t sizes[] = {
132 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
133 [STATEMENT_RETURN] = sizeof(return_statement_t),
134 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
135 [STATEMENT_IF] = sizeof(if_statement_t),
136 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
137 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
138 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
139 [STATEMENT_BREAK] = sizeof(statement_base_t),
140 [STATEMENT_GOTO] = sizeof(goto_statement_t),
141 [STATEMENT_LABEL] = sizeof(label_statement_t),
142 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
143 [STATEMENT_WHILE] = sizeof(while_statement_t),
144 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
145 [STATEMENT_FOR] = sizeof(for_statement_t),
146 [STATEMENT_ASM] = sizeof(asm_statement_t)
148 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
149 assert(sizes[kind] != 0);
153 static statement_t *allocate_statement_zero(statement_kind_t kind)
155 size_t size = get_statement_struct_size(kind);
156 statement_t *res = allocate_ast_zero(size);
158 res->base.kind = kind;
163 static size_t get_expression_struct_size(expression_kind_t type)
165 static const size_t sizes[] = {
166 [EXPR_INVALID] = sizeof(expression_base_t),
167 [EXPR_REFERENCE] = sizeof(reference_expression_t),
168 [EXPR_CONST] = sizeof(const_expression_t),
169 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
170 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
171 [EXPR_CALL] = sizeof(call_expression_t),
172 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
173 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
174 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
175 [EXPR_SELECT] = sizeof(select_expression_t),
176 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
177 [EXPR_SIZEOF] = sizeof(sizeof_expression_t),
178 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
179 [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
180 [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
181 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
182 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
183 [EXPR_VA_START] = sizeof(va_start_expression_t),
184 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
185 [EXPR_STATEMENT] = sizeof(statement_expression_t),
187 if(type >= EXPR_UNARY_FIRST && type <= EXPR_UNARY_LAST) {
188 return sizes[EXPR_UNARY_FIRST];
190 if(type >= EXPR_BINARY_FIRST && type <= EXPR_BINARY_LAST) {
191 return sizes[EXPR_BINARY_FIRST];
193 assert(type <= sizeof(sizes) / sizeof(sizes[0]));
194 assert(sizes[type] != 0);
198 static expression_t *allocate_expression_zero(expression_kind_t kind)
200 size_t size = get_expression_struct_size(kind);
201 expression_t *res = allocate_ast_zero(size);
203 res->base.kind = kind;
207 static size_t get_type_struct_size(type_kind_t kind)
209 static const size_t sizes[] = {
210 [TYPE_ATOMIC] = sizeof(atomic_type_t),
211 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
212 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
213 [TYPE_ENUM] = sizeof(enum_type_t),
214 [TYPE_FUNCTION] = sizeof(function_type_t),
215 [TYPE_POINTER] = sizeof(pointer_type_t),
216 [TYPE_ARRAY] = sizeof(array_type_t),
217 [TYPE_BUILTIN] = sizeof(builtin_type_t),
218 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
219 [TYPE_TYPEOF] = sizeof(typeof_type_t),
221 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
222 assert(kind <= TYPE_TYPEOF);
223 assert(sizes[kind] != 0);
227 static type_t *allocate_type_zero(type_kind_t kind)
229 size_t size = get_type_struct_size(kind);
230 type_t *res = obstack_alloc(type_obst, size);
231 memset(res, 0, size);
233 res->base.kind = kind;
237 static size_t get_initializer_size(initializer_kind_t kind)
239 static const size_t sizes[] = {
240 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
241 [INITIALIZER_STRING] = sizeof(initializer_string_t),
242 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
243 [INITIALIZER_LIST] = sizeof(initializer_list_t)
245 assert(kind < sizeof(sizes) / sizeof(*sizes));
246 assert(sizes[kind] != 0);
250 static initializer_t *allocate_initializer(initializer_kind_t kind)
252 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
258 static void free_type(void *type)
260 obstack_free(type_obst, type);
264 * returns the top element of the environment stack
266 static size_t environment_top(void)
268 return ARR_LEN(environment_stack);
271 static size_t label_top(void)
273 return ARR_LEN(label_stack);
278 static inline void next_token(void)
280 token = lookahead_buffer[lookahead_bufpos];
281 lookahead_buffer[lookahead_bufpos] = lexer_token;
284 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
287 print_token(stderr, &token);
288 fprintf(stderr, "\n");
292 static inline const token_t *look_ahead(int num)
294 assert(num > 0 && num <= MAX_LOOKAHEAD);
295 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
296 return &lookahead_buffer[pos];
299 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
301 static void error(void)
304 #ifdef ABORT_ON_ERROR
309 static void parser_print_error_prefix_pos(
310 const source_position_t source_position)
312 parser_print_prefix_pos(source_position);
313 fputs("error: ", stderr);
317 static void parser_print_error_prefix(void)
319 parser_print_error_prefix_pos(token.source_position);
322 static void parse_error(const char *message)
324 parser_print_error_prefix();
325 fprintf(stderr, "parse error: %s\n", message);
328 static void parser_print_warning_prefix(void)
330 parser_print_warning_prefix_pos(token.source_position);
333 static void parse_warning(const char *message)
335 parse_warning_pos(token.source_position, message);
338 static void parse_error_expected(const char *message, ...)
343 if(message != NULL) {
344 parser_print_error_prefix();
345 fprintf(stderr, "%s\n", message);
347 parser_print_error_prefix();
348 fputs("Parse error: got ", stderr);
349 print_token(stderr, &token);
350 fputs(", expected ", stderr);
352 va_start(args, message);
353 token_type_t token_type = va_arg(args, token_type_t);
354 while(token_type != 0) {
358 fprintf(stderr, ", ");
360 print_token_type(stderr, token_type);
361 token_type = va_arg(args, token_type_t);
364 fprintf(stderr, "\n");
367 static void print_type_quoted(type_t *type)
374 static void type_error(const char *msg, const source_position_t source_position,
377 parser_print_error_prefix_pos(source_position);
378 fprintf(stderr, "%s, but found type ", msg);
379 print_type_quoted(type);
383 static void type_error_incompatible(const char *msg,
384 const source_position_t source_position, type_t *type1, type_t *type2)
386 parser_print_error_prefix_pos(source_position);
387 fprintf(stderr, "%s, incompatible types: ", msg);
388 print_type_quoted(type1);
389 fprintf(stderr, " - ");
390 print_type_quoted(type2);
391 fprintf(stderr, ")\n");
394 static void eat_block(void)
396 if(token.type == '{')
399 while(token.type != '}') {
400 if(token.type == T_EOF)
402 if(token.type == '{') {
411 static void eat_statement(void)
413 while(token.type != ';') {
414 if(token.type == T_EOF)
416 if(token.type == '}')
418 if(token.type == '{') {
427 static void eat_paren(void)
429 if(token.type == '(')
432 while(token.type != ')') {
433 if(token.type == T_EOF)
435 if(token.type == ')' || token.type == ';' || token.type == '}') {
438 if(token.type == '(') {
442 if(token.type == '{') {
451 #define expect(expected) \
452 if(UNLIKELY(token.type != (expected))) { \
453 parse_error_expected(NULL, (expected), 0); \
459 #define expect_block(expected) \
460 if(UNLIKELY(token.type != (expected))) { \
461 parse_error_expected(NULL, (expected), 0); \
467 #define expect_void(expected) \
468 if(UNLIKELY(token.type != (expected))) { \
469 parse_error_expected(NULL, (expected), 0); \
475 static void set_context(context_t *new_context)
477 context = new_context;
479 last_declaration = new_context->declarations;
480 if(last_declaration != NULL) {
481 while(last_declaration->next != NULL) {
482 last_declaration = last_declaration->next;
488 * called when we find a 2nd declarator for an identifier we already have a
491 static bool is_compatible_declaration(declaration_t *declaration,
492 declaration_t *previous)
494 /* happens for K&R style function parameters */
495 if(previous->type == NULL) {
496 previous->type = declaration->type;
500 type_t *type1 = skip_typeref(declaration->type);
501 type_t *type2 = skip_typeref(previous->type);
503 return types_compatible(type1, type2);
506 static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespc)
508 declaration_t *declaration = symbol->declaration;
509 for( ; declaration != NULL; declaration = declaration->symbol_next) {
510 if(declaration->namespc == namespc)
517 static const char *get_namespace_prefix(namespace_t namespc)
520 case NAMESPACE_NORMAL:
522 case NAMESPACE_UNION:
524 case NAMESPACE_STRUCT:
528 case NAMESPACE_LABEL:
531 panic("invalid namespace found");
535 * pushs an environment_entry on the environment stack and links the
536 * corresponding symbol to the new entry
538 static declaration_t *stack_push(stack_entry_t **stack_ptr,
539 declaration_t *declaration,
540 context_t *parent_context)
542 symbol_t *symbol = declaration->symbol;
543 namespace_t namespc = (namespace_t)declaration->namespc;
545 /* a declaration should be only pushed once */
546 declaration->parent_context = parent_context;
548 declaration_t *previous_declaration = get_declaration(symbol, namespc);
549 assert(declaration != previous_declaration);
550 if(previous_declaration != NULL
551 && previous_declaration->parent_context == context) {
552 if(!is_compatible_declaration(declaration, previous_declaration)) {
553 parser_print_error_prefix_pos(declaration->source_position);
554 fprintf(stderr, "definition of symbol '%s%s' with type ",
555 get_namespace_prefix(namespc), symbol->string);
556 print_type_quoted(declaration->type);
558 parser_print_error_prefix_pos(
559 previous_declaration->source_position);
560 fprintf(stderr, "is incompatible with previous declaration "
562 print_type_quoted(previous_declaration->type);
565 unsigned old_storage_class = previous_declaration->storage_class;
566 unsigned new_storage_class = declaration->storage_class;
567 type_t *type = previous_declaration->type;
568 type = skip_typeref(type);
570 if (current_function == NULL) {
571 if (old_storage_class != STORAGE_CLASS_STATIC &&
572 new_storage_class == STORAGE_CLASS_STATIC) {
573 parser_print_error_prefix_pos(declaration->source_position);
575 "static declaration of '%s' follows non-static declaration\n",
577 parser_print_error_prefix_pos(previous_declaration->source_position);
578 fprintf(stderr, "previous declaration of '%s' was here\n",
581 if (old_storage_class == STORAGE_CLASS_EXTERN) {
582 if (new_storage_class == STORAGE_CLASS_NONE) {
583 previous_declaration->storage_class = STORAGE_CLASS_NONE;
585 } else if(!is_type_function(type)) {
586 parser_print_warning_prefix_pos(declaration->source_position);
587 fprintf(stderr, "redundant declaration for '%s'\n",
589 parser_print_warning_prefix_pos(previous_declaration->source_position);
590 fprintf(stderr, "previous declaration of '%s' was here\n",
595 if (old_storage_class == STORAGE_CLASS_EXTERN &&
596 new_storage_class == STORAGE_CLASS_EXTERN) {
597 parser_print_warning_prefix_pos(declaration->source_position);
598 fprintf(stderr, "redundant extern declaration for '%s'\n",
600 parser_print_warning_prefix_pos(previous_declaration->source_position);
601 fprintf(stderr, "previous declaration of '%s' was here\n",
604 parser_print_error_prefix_pos(declaration->source_position);
605 if (old_storage_class == new_storage_class) {
606 fprintf(stderr, "redeclaration of '%s'\n", symbol->string);
608 fprintf(stderr, "redeclaration of '%s' with different linkage\n", symbol->string);
610 parser_print_error_prefix_pos(previous_declaration->source_position);
611 fprintf(stderr, "previous declaration of '%s' was here\n",
616 return previous_declaration;
619 /* remember old declaration */
621 entry.symbol = symbol;
622 entry.old_declaration = symbol->declaration;
623 entry.namespc = (unsigned short) namespc;
624 ARR_APP1(stack_entry_t, *stack_ptr, entry);
626 /* replace/add declaration into declaration list of the symbol */
627 if(symbol->declaration == NULL) {
628 symbol->declaration = declaration;
630 declaration_t *iter_last = NULL;
631 declaration_t *iter = symbol->declaration;
632 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
633 /* replace an entry? */
634 if(iter->namespc == namespc) {
635 if(iter_last == NULL) {
636 symbol->declaration = declaration;
638 iter_last->symbol_next = declaration;
640 declaration->symbol_next = iter->symbol_next;
645 assert(iter_last->symbol_next == NULL);
646 iter_last->symbol_next = declaration;
653 static declaration_t *environment_push(declaration_t *declaration)
655 assert(declaration->source_position.input_name != NULL);
656 return stack_push(&environment_stack, declaration, context);
659 static declaration_t *label_push(declaration_t *declaration)
661 return stack_push(&label_stack, declaration, ¤t_function->context);
665 * pops symbols from the environment stack until @p new_top is the top element
667 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
669 stack_entry_t *stack = *stack_ptr;
670 size_t top = ARR_LEN(stack);
673 assert(new_top <= top);
677 for(i = top; i > new_top; --i) {
678 stack_entry_t *entry = &stack[i - 1];
680 declaration_t *old_declaration = entry->old_declaration;
681 symbol_t *symbol = entry->symbol;
682 namespace_t namespc = (namespace_t)entry->namespc;
684 /* replace/remove declaration */
685 declaration_t *declaration = symbol->declaration;
686 assert(declaration != NULL);
687 if(declaration->namespc == namespc) {
688 if(old_declaration == NULL) {
689 symbol->declaration = declaration->symbol_next;
691 symbol->declaration = old_declaration;
694 declaration_t *iter_last = declaration;
695 declaration_t *iter = declaration->symbol_next;
696 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
697 /* replace an entry? */
698 if(iter->namespc == namespc) {
699 assert(iter_last != NULL);
700 iter_last->symbol_next = old_declaration;
701 old_declaration->symbol_next = iter->symbol_next;
705 assert(iter != NULL);
709 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
712 static void environment_pop_to(size_t new_top)
714 stack_pop_to(&environment_stack, new_top);
717 static void label_pop_to(size_t new_top)
719 stack_pop_to(&label_stack, new_top);
723 static int get_rank(const type_t *type)
725 assert(!is_typeref(type));
726 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
727 * and esp. footnote 108). However we can't fold constants (yet), so we
728 * can't decide whether unsigned int is possible, while int always works.
729 * (unsigned int would be preferable when possible... for stuff like
730 * struct { enum { ... } bla : 4; } ) */
731 if(type->kind == TYPE_ENUM)
732 return ATOMIC_TYPE_INT;
734 assert(type->kind == TYPE_ATOMIC);
735 const atomic_type_t *atomic_type = &type->atomic;
736 atomic_type_type_t atype = atomic_type->atype;
740 static type_t *promote_integer(type_t *type)
742 if(get_rank(type) < ATOMIC_TYPE_INT)
748 static expression_t *create_cast_expression(expression_t *expression,
751 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
753 cast->unary.value = expression;
754 cast->base.datatype = dest_type;
759 static bool is_null_pointer_constant(const expression_t *expression)
761 /* skip void* cast */
762 if(expression->kind == EXPR_UNARY_CAST
763 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
764 expression = expression->unary.value;
767 /* TODO: not correct yet, should be any constant integer expression
768 * which evaluates to 0 */
769 if (expression->kind != EXPR_CONST)
772 type_t *const type = skip_typeref(expression->base.datatype);
773 if (!is_type_integer(type))
776 return expression->conste.v.int_value == 0;
779 static expression_t *create_implicit_cast(expression_t *expression,
782 type_t *source_type = expression->base.datatype;
784 if(source_type == NULL)
787 source_type = skip_typeref(source_type);
788 dest_type = skip_typeref(dest_type);
790 if(source_type == dest_type)
793 switch (dest_type->kind) {
795 /* TODO warning for implicitly converting to enum */
797 if (source_type->kind != TYPE_ATOMIC &&
798 source_type->kind != TYPE_ENUM) {
799 panic("casting of non-atomic types not implemented yet");
802 if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
803 type_error_incompatible("can't cast types",
804 expression->base.source_position, source_type,
809 return create_cast_expression(expression, dest_type);
812 switch (source_type->kind) {
814 if (is_null_pointer_constant(expression)) {
815 return create_cast_expression(expression, dest_type);
820 if (pointers_compatible(source_type, dest_type)) {
821 return create_cast_expression(expression, dest_type);
826 array_type_t *array_type = &source_type->array;
827 pointer_type_t *pointer_type = &dest_type->pointer;
828 if (types_compatible(array_type->element_type,
829 pointer_type->points_to)) {
830 return create_cast_expression(expression, dest_type);
836 panic("casting of non-atomic types not implemented yet");
839 type_error_incompatible("can't implicitly cast types",
840 expression->base.source_position, source_type, dest_type);
844 panic("casting of non-atomic types not implemented yet");
848 /** Implements the rules from § 6.5.16.1 */
849 static void semantic_assign(type_t *orig_type_left, expression_t **right,
852 type_t *orig_type_right = (*right)->base.datatype;
854 if(orig_type_right == NULL)
857 type_t *const type_left = skip_typeref(orig_type_left);
858 type_t *const type_right = skip_typeref(orig_type_right);
860 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
861 (is_type_pointer(type_left) && is_null_pointer_constant(*right)) ||
862 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
863 && is_type_pointer(type_right))) {
864 *right = create_implicit_cast(*right, type_left);
868 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
869 pointer_type_t *pointer_type_left = &type_left->pointer;
870 pointer_type_t *pointer_type_right = &type_right->pointer;
871 type_t *points_to_left = pointer_type_left->points_to;
872 type_t *points_to_right = pointer_type_right->points_to;
874 points_to_left = skip_typeref(points_to_left);
875 points_to_right = skip_typeref(points_to_right);
877 /* the left type has all qualifiers from the right type */
878 unsigned missing_qualifiers
879 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
880 if(missing_qualifiers != 0) {
881 parser_print_error_prefix();
882 fprintf(stderr, "destination type ");
883 print_type_quoted(type_left);
884 fprintf(stderr, " in %s from type ", context);
885 print_type_quoted(type_right);
886 fprintf(stderr, " lacks qualifiers '");
887 print_type_qualifiers(missing_qualifiers);
888 fprintf(stderr, "' in pointed-to type\n");
892 points_to_left = get_unqualified_type(points_to_left);
893 points_to_right = get_unqualified_type(points_to_right);
895 if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
896 && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
897 && !types_compatible(points_to_left, points_to_right)) {
898 goto incompatible_assign_types;
901 *right = create_implicit_cast(*right, type_left);
905 if (is_type_compound(type_left)
906 && types_compatible(type_left, type_right)) {
907 *right = create_implicit_cast(*right, type_left);
911 incompatible_assign_types:
912 /* TODO: improve error message */
913 parser_print_error_prefix();
914 fprintf(stderr, "incompatible types in %s\n", context);
915 parser_print_error_prefix();
916 print_type_quoted(orig_type_left);
917 fputs(" <- ", stderr);
918 print_type_quoted(orig_type_right);
922 static expression_t *parse_constant_expression(void)
924 /* start parsing at precedence 7 (conditional expression) */
925 expression_t *result = parse_sub_expression(7);
927 if(!is_constant_expression(result)) {
928 parser_print_error_prefix_pos(result->base.source_position);
929 fprintf(stderr, "expression '");
930 print_expression(result);
931 fprintf(stderr, "' is not constant\n");
937 static expression_t *parse_assignment_expression(void)
939 /* start parsing at precedence 2 (assignment expression) */
940 return parse_sub_expression(2);
943 static type_t *make_global_typedef(const char *name, type_t *type)
945 symbol_t *const symbol = symbol_table_insert(name);
947 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
948 declaration->namespc = NAMESPACE_NORMAL;
949 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
950 declaration->type = type;
951 declaration->symbol = symbol;
952 declaration->source_position = builtin_source_position;
954 record_declaration(declaration);
956 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF);
957 typedef_type->typedeft.declaration = declaration;
962 static const char *parse_string_literals(void)
964 assert(token.type == T_STRING_LITERAL);
965 const char *result = token.v.string;
969 while(token.type == T_STRING_LITERAL) {
970 result = concat_strings(result, token.v.string);
977 static void parse_attributes(void)
981 case T___attribute__: {
989 parse_error("EOF while parsing attribute");
1008 if(token.type != T_STRING_LITERAL) {
1009 parse_error_expected("while parsing assembler attribute",
1014 parse_string_literals();
1019 goto attributes_finished;
1023 attributes_finished:
1028 static designator_t *parse_designation(void)
1030 if(token.type != '[' && token.type != '.')
1033 designator_t *result = NULL;
1034 designator_t *last = NULL;
1037 designator_t *designator;
1038 switch(token.type) {
1040 designator = allocate_ast_zero(sizeof(designator[0]));
1042 designator->array_access = parse_constant_expression();
1046 designator = allocate_ast_zero(sizeof(designator[0]));
1048 if(token.type != T_IDENTIFIER) {
1049 parse_error_expected("while parsing designator",
1053 designator->symbol = token.v.symbol;
1061 assert(designator != NULL);
1063 last->next = designator;
1065 result = designator;
1072 static initializer_t *initializer_from_string(array_type_t *type,
1075 /* TODO: check len vs. size of array type */
1078 initializer_t *initializer = allocate_initializer(INITIALIZER_STRING);
1079 initializer->string.string = string;
1084 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1085 wide_string_t *const string)
1087 /* TODO: check len vs. size of array type */
1090 initializer_t *const initializer =
1091 allocate_initializer(INITIALIZER_WIDE_STRING);
1092 initializer->wide_string.string = *string;
1097 static initializer_t *initializer_from_expression(type_t *type,
1098 expression_t *expression)
1100 /* TODO check that expression is a constant expression */
1102 /* § 6.7.8.14/15 char array may be initialized by string literals */
1103 type_t *const expr_type = expression->base.datatype;
1104 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1105 array_type_t *const array_type = &type->array;
1106 type_t *const element_type = skip_typeref(array_type->element_type);
1108 if (element_type->kind == TYPE_ATOMIC) {
1109 switch (expression->kind) {
1110 case EXPR_STRING_LITERAL:
1111 if (element_type->atomic.atype == ATOMIC_TYPE_CHAR) {
1112 return initializer_from_string(array_type,
1113 expression->string.value);
1116 case EXPR_WIDE_STRING_LITERAL: {
1117 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1118 if (get_unqualified_type(element_type) == bare_wchar_type) {
1119 return initializer_from_wide_string(array_type,
1120 &expression->wide_string.value);
1129 type_t *expression_type = skip_typeref(expression->base.datatype);
1130 if(is_type_scalar(type) || types_compatible(type, expression_type)) {
1131 semantic_assign(type, &expression, "initializer");
1133 initializer_t *result = allocate_initializer(INITIALIZER_VALUE);
1134 result->value.value = expression;
1142 static initializer_t *parse_sub_initializer(type_t *type,
1143 expression_t *expression,
1144 type_t *expression_type);
1146 static initializer_t *parse_sub_initializer_elem(type_t *type)
1148 if(token.type == '{') {
1149 return parse_sub_initializer(type, NULL, NULL);
1152 expression_t *expression = parse_assignment_expression();
1153 type_t *expression_type = skip_typeref(expression->base.datatype);
1155 return parse_sub_initializer(type, expression, expression_type);
1158 static bool had_initializer_brace_warning;
1160 static initializer_t *parse_sub_initializer(type_t *type,
1161 expression_t *expression,
1162 type_t *expression_type)
1164 if(is_type_scalar(type)) {
1165 /* there might be extra {} hierarchies */
1166 if(token.type == '{') {
1168 if(!had_initializer_brace_warning) {
1169 parse_warning("braces around scalar initializer");
1170 had_initializer_brace_warning = true;
1172 initializer_t *result = parse_sub_initializer(type, NULL, NULL);
1173 if(token.type == ',') {
1175 /* TODO: warn about excessive elements */
1181 if(expression == NULL) {
1182 expression = parse_assignment_expression();
1184 return initializer_from_expression(type, expression);
1187 /* does the expression match the currently looked at object to initialize */
1188 if(expression != NULL) {
1189 initializer_t *result = initializer_from_expression(type, expression);
1194 bool read_paren = false;
1195 if(token.type == '{') {
1200 /* descend into subtype */
1201 initializer_t *result = NULL;
1202 initializer_t **elems;
1203 if(is_type_array(type)) {
1204 array_type_t *array_type = &type->array;
1205 type_t *element_type = array_type->element_type;
1206 element_type = skip_typeref(element_type);
1209 had_initializer_brace_warning = false;
1210 if(expression == NULL) {
1211 sub = parse_sub_initializer_elem(element_type);
1213 sub = parse_sub_initializer(element_type, expression,
1217 /* didn't match the subtypes -> try the parent type */
1219 assert(!read_paren);
1223 elems = NEW_ARR_F(initializer_t*, 0);
1224 ARR_APP1(initializer_t*, elems, sub);
1227 if(token.type == '}')
1230 if(token.type == '}')
1233 sub = parse_sub_initializer_elem(element_type);
1235 /* TODO error, do nicer cleanup */
1236 parse_error("member initializer didn't match");
1240 ARR_APP1(initializer_t*, elems, sub);
1243 assert(is_type_compound(type));
1244 compound_type_t *compound_type = &type->compound;
1245 context_t *context = &compound_type->declaration->context;
1247 declaration_t *first = context->declarations;
1250 type_t *first_type = first->type;
1251 first_type = skip_typeref(first_type);
1254 had_initializer_brace_warning = false;
1255 if(expression == NULL) {
1256 sub = parse_sub_initializer_elem(first_type);
1258 sub = parse_sub_initializer(first_type, expression,expression_type);
1261 /* didn't match the subtypes -> try our parent type */
1263 assert(!read_paren);
1267 elems = NEW_ARR_F(initializer_t*, 0);
1268 ARR_APP1(initializer_t*, elems, sub);
1270 declaration_t *iter = first->next;
1271 for( ; iter != NULL; iter = iter->next) {
1272 if(iter->symbol == NULL)
1274 if(iter->namespc != NAMESPACE_NORMAL)
1277 if(token.type == '}')
1280 if(token.type == '}')
1283 type_t *iter_type = iter->type;
1284 iter_type = skip_typeref(iter_type);
1286 sub = parse_sub_initializer_elem(iter_type);
1288 /* TODO error, do nicer cleanup */
1289 parse_error("member initializer didn't match");
1293 ARR_APP1(initializer_t*, elems, sub);
1297 int len = ARR_LEN(elems);
1298 size_t elems_size = sizeof(initializer_t*) * len;
1300 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1302 init->initializer.kind = INITIALIZER_LIST;
1304 memcpy(init->initializers, elems, elems_size);
1307 result = (initializer_t*) init;
1310 if(token.type == ',')
1317 static initializer_t *parse_initializer(type_t *type)
1319 initializer_t *result;
1321 type = skip_typeref(type);
1323 if(token.type != '{') {
1324 expression_t *expression = parse_assignment_expression();
1325 initializer_t *initializer = initializer_from_expression(type, expression);
1326 if(initializer == NULL) {
1327 parser_print_error_prefix();
1328 fprintf(stderr, "initializer expression '");
1329 print_expression(expression);
1330 fprintf(stderr, "', type ");
1331 print_type_quoted(expression->base.datatype);
1332 fprintf(stderr, " is incompatible with type ");
1333 print_type_quoted(type);
1334 fprintf(stderr, "\n");
1339 if(is_type_scalar(type)) {
1343 expression_t *expression = parse_assignment_expression();
1344 result = initializer_from_expression(type, expression);
1346 if(token.type == ',')
1352 result = parse_sub_initializer(type, NULL, NULL);
1360 static declaration_t *parse_compound_type_specifier(bool is_struct)
1368 symbol_t *symbol = NULL;
1369 declaration_t *declaration = NULL;
1371 if (token.type == T___attribute__) {
1376 if(token.type == T_IDENTIFIER) {
1377 symbol = token.v.symbol;
1381 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1383 declaration = get_declaration(symbol, NAMESPACE_UNION);
1385 } else if(token.type != '{') {
1387 parse_error_expected("while parsing struct type specifier",
1388 T_IDENTIFIER, '{', 0);
1390 parse_error_expected("while parsing union type specifier",
1391 T_IDENTIFIER, '{', 0);
1397 if(declaration == NULL) {
1398 declaration = allocate_ast_zero(sizeof(declaration[0]));
1401 declaration->namespc = NAMESPACE_STRUCT;
1403 declaration->namespc = NAMESPACE_UNION;
1405 declaration->source_position = token.source_position;
1406 declaration->symbol = symbol;
1407 record_declaration(declaration);
1410 if(token.type == '{') {
1411 if(declaration->init.is_defined) {
1412 assert(symbol != NULL);
1413 parser_print_error_prefix();
1414 fprintf(stderr, "multiple definition of %s %s\n",
1415 is_struct ? "struct" : "union", symbol->string);
1416 declaration->context.declarations = NULL;
1418 declaration->init.is_defined = true;
1420 int top = environment_top();
1421 context_t *last_context = context;
1422 set_context(&declaration->context);
1424 parse_compound_type_entries();
1427 assert(context == &declaration->context);
1428 set_context(last_context);
1429 environment_pop_to(top);
1435 static void parse_enum_entries(enum_type_t *const enum_type)
1439 if(token.type == '}') {
1441 parse_error("empty enum not allowed");
1446 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
1448 if(token.type != T_IDENTIFIER) {
1449 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1453 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1454 entry->type = (type_t*) enum_type;
1455 entry->symbol = token.v.symbol;
1456 entry->source_position = token.source_position;
1459 if(token.type == '=') {
1461 entry->init.enum_value = parse_constant_expression();
1466 record_declaration(entry);
1468 if(token.type != ',')
1471 } while(token.type != '}');
1476 static type_t *parse_enum_specifier(void)
1480 declaration_t *declaration;
1483 if(token.type == T_IDENTIFIER) {
1484 symbol = token.v.symbol;
1487 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1488 } else if(token.type != '{') {
1489 parse_error_expected("while parsing enum type specifier",
1490 T_IDENTIFIER, '{', 0);
1497 if(declaration == NULL) {
1498 declaration = allocate_ast_zero(sizeof(declaration[0]));
1500 declaration->namespc = NAMESPACE_ENUM;
1501 declaration->source_position = token.source_position;
1502 declaration->symbol = symbol;
1505 type_t *const type = allocate_type_zero(TYPE_ENUM);
1506 type->enumt.declaration = declaration;
1508 if(token.type == '{') {
1509 if(declaration->init.is_defined) {
1510 parser_print_error_prefix();
1511 fprintf(stderr, "multiple definitions of enum %s\n",
1514 record_declaration(declaration);
1515 declaration->init.is_defined = 1;
1517 parse_enum_entries(&type->enumt);
1525 * if a symbol is a typedef to another type, return true
1527 static bool is_typedef_symbol(symbol_t *symbol)
1529 const declaration_t *const declaration =
1530 get_declaration(symbol, NAMESPACE_NORMAL);
1532 declaration != NULL &&
1533 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1536 static type_t *parse_typeof(void)
1544 expression_t *expression = NULL;
1547 switch(token.type) {
1548 case T___extension__:
1549 /* this can be a prefix to a typename or an expression */
1550 /* we simply eat it now. */
1553 } while(token.type == T___extension__);
1557 if(is_typedef_symbol(token.v.symbol)) {
1558 type = parse_typename();
1560 expression = parse_expression();
1561 type = expression->base.datatype;
1566 type = parse_typename();
1570 expression = parse_expression();
1571 type = expression->base.datatype;
1577 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1578 typeof_type->typeoft.expression = expression;
1579 typeof_type->typeoft.typeof_type = type;
1585 SPECIFIER_SIGNED = 1 << 0,
1586 SPECIFIER_UNSIGNED = 1 << 1,
1587 SPECIFIER_LONG = 1 << 2,
1588 SPECIFIER_INT = 1 << 3,
1589 SPECIFIER_DOUBLE = 1 << 4,
1590 SPECIFIER_CHAR = 1 << 5,
1591 SPECIFIER_SHORT = 1 << 6,
1592 SPECIFIER_LONG_LONG = 1 << 7,
1593 SPECIFIER_FLOAT = 1 << 8,
1594 SPECIFIER_BOOL = 1 << 9,
1595 SPECIFIER_VOID = 1 << 10,
1596 #ifdef PROVIDE_COMPLEX
1597 SPECIFIER_COMPLEX = 1 << 11,
1598 SPECIFIER_IMAGINARY = 1 << 12,
1602 static type_t *create_builtin_type(symbol_t *const symbol,
1603 type_t *const real_type)
1605 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1606 type->builtin.symbol = symbol;
1607 type->builtin.real_type = real_type;
1609 type_t *result = typehash_insert(type);
1610 if (type != result) {
1617 static type_t *get_typedef_type(symbol_t *symbol)
1619 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1620 if(declaration == NULL
1621 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1624 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1625 type->typedeft.declaration = declaration;
1630 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1632 type_t *type = NULL;
1633 unsigned type_qualifiers = 0;
1634 unsigned type_specifiers = 0;
1637 specifiers->source_position = token.source_position;
1640 switch(token.type) {
1643 #define MATCH_STORAGE_CLASS(token, class) \
1645 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1646 parse_error("multiple storage classes in declaration " \
1649 specifiers->storage_class = class; \
1653 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1654 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1655 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1656 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1657 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1660 switch (specifiers->storage_class) {
1661 case STORAGE_CLASS_NONE:
1662 specifiers->storage_class = STORAGE_CLASS_THREAD;
1665 case STORAGE_CLASS_EXTERN:
1666 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1669 case STORAGE_CLASS_STATIC:
1670 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1674 parse_error("multiple storage classes in declaration specifiers");
1680 /* type qualifiers */
1681 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1683 type_qualifiers |= qualifier; \
1687 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1688 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1689 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1691 case T___extension__:
1696 /* type specifiers */
1697 #define MATCH_SPECIFIER(token, specifier, name) \
1700 if(type_specifiers & specifier) { \
1701 parse_error("multiple " name " type specifiers given"); \
1703 type_specifiers |= specifier; \
1707 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1708 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1709 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1710 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1711 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1712 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1713 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1714 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1715 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1716 #ifdef PROVIDE_COMPLEX
1717 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1718 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1721 /* only in microsoft mode */
1722 specifiers->decl_modifiers |= DM_FORCEINLINE;
1726 specifiers->is_inline = true;
1731 if(type_specifiers & SPECIFIER_LONG_LONG) {
1732 parse_error("multiple type specifiers given");
1733 } else if(type_specifiers & SPECIFIER_LONG) {
1734 type_specifiers |= SPECIFIER_LONG_LONG;
1736 type_specifiers |= SPECIFIER_LONG;
1740 /* TODO: if type != NULL for the following rules should issue
1743 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1745 type->compound.declaration = parse_compound_type_specifier(true);
1749 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1751 type->compound.declaration = parse_compound_type_specifier(false);
1755 type = parse_enum_specifier();
1758 type = parse_typeof();
1760 case T___builtin_va_list:
1761 type = duplicate_type(type_valist);
1765 case T___attribute__:
1770 case T_IDENTIFIER: {
1771 type_t *typedef_type = get_typedef_type(token.v.symbol);
1773 if(typedef_type == NULL)
1774 goto finish_specifiers;
1777 type = typedef_type;
1781 /* function specifier */
1783 goto finish_specifiers;
1790 atomic_type_type_t atomic_type;
1792 /* match valid basic types */
1793 switch(type_specifiers) {
1794 case SPECIFIER_VOID:
1795 atomic_type = ATOMIC_TYPE_VOID;
1797 case SPECIFIER_CHAR:
1798 atomic_type = ATOMIC_TYPE_CHAR;
1800 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1801 atomic_type = ATOMIC_TYPE_SCHAR;
1803 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1804 atomic_type = ATOMIC_TYPE_UCHAR;
1806 case SPECIFIER_SHORT:
1807 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1808 case SPECIFIER_SHORT | SPECIFIER_INT:
1809 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1810 atomic_type = ATOMIC_TYPE_SHORT;
1812 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1813 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1814 atomic_type = ATOMIC_TYPE_USHORT;
1817 case SPECIFIER_SIGNED:
1818 case SPECIFIER_SIGNED | SPECIFIER_INT:
1819 atomic_type = ATOMIC_TYPE_INT;
1821 case SPECIFIER_UNSIGNED:
1822 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1823 atomic_type = ATOMIC_TYPE_UINT;
1825 case SPECIFIER_LONG:
1826 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1827 case SPECIFIER_LONG | SPECIFIER_INT:
1828 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1829 atomic_type = ATOMIC_TYPE_LONG;
1831 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1832 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1833 atomic_type = ATOMIC_TYPE_ULONG;
1835 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1836 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1837 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1838 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1840 atomic_type = ATOMIC_TYPE_LONGLONG;
1842 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1843 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1845 atomic_type = ATOMIC_TYPE_ULONGLONG;
1847 case SPECIFIER_FLOAT:
1848 atomic_type = ATOMIC_TYPE_FLOAT;
1850 case SPECIFIER_DOUBLE:
1851 atomic_type = ATOMIC_TYPE_DOUBLE;
1853 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1854 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1856 case SPECIFIER_BOOL:
1857 atomic_type = ATOMIC_TYPE_BOOL;
1859 #ifdef PROVIDE_COMPLEX
1860 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1861 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1863 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1864 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1866 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1867 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1869 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1870 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1872 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1873 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1875 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1876 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1880 /* invalid specifier combination, give an error message */
1881 if(type_specifiers == 0) {
1883 parse_warning("no type specifiers in declaration, using int");
1884 atomic_type = ATOMIC_TYPE_INT;
1887 parse_error("no type specifiers given in declaration");
1889 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1890 (type_specifiers & SPECIFIER_UNSIGNED)) {
1891 parse_error("signed and unsigned specifiers gives");
1892 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1893 parse_error("only integer types can be signed or unsigned");
1895 parse_error("multiple datatypes in declaration");
1897 atomic_type = ATOMIC_TYPE_INVALID;
1900 type = allocate_type_zero(TYPE_ATOMIC);
1901 type->atomic.atype = atomic_type;
1904 if(type_specifiers != 0) {
1905 parse_error("multiple datatypes in declaration");
1909 type->base.qualifiers = type_qualifiers;
1911 type_t *result = typehash_insert(type);
1912 if(newtype && result != type) {
1916 specifiers->type = result;
1919 static type_qualifiers_t parse_type_qualifiers(void)
1921 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1924 switch(token.type) {
1925 /* type qualifiers */
1926 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1927 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1928 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1931 return type_qualifiers;
1936 static declaration_t *parse_identifier_list(void)
1938 declaration_t *declarations = NULL;
1939 declaration_t *last_declaration = NULL;
1941 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1943 declaration->source_position = token.source_position;
1944 declaration->symbol = token.v.symbol;
1947 if(last_declaration != NULL) {
1948 last_declaration->next = declaration;
1950 declarations = declaration;
1952 last_declaration = declaration;
1954 if(token.type != ',')
1957 } while(token.type == T_IDENTIFIER);
1959 return declarations;
1962 static void semantic_parameter(declaration_t *declaration)
1964 /* TODO: improve error messages */
1966 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1967 parse_error("typedef not allowed in parameter list");
1968 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1969 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1970 parse_error("parameter may only have none or register storage class");
1973 type_t *orig_type = declaration->type;
1974 if(orig_type == NULL)
1976 type_t *type = skip_typeref(orig_type);
1978 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1979 * into a pointer. § 6.7.5.3 (7) */
1980 if (is_type_array(type)) {
1981 const array_type_t *arr_type = &type->array;
1982 type_t *element_type = arr_type->element_type;
1984 type = make_pointer_type(element_type, type->base.qualifiers);
1986 declaration->type = type;
1989 if(is_type_incomplete(type)) {
1990 parser_print_error_prefix();
1991 fprintf(stderr, "incomplete type (");
1992 print_type_quoted(orig_type);
1993 fprintf(stderr, ") not allowed for parameter '%s'\n",
1994 declaration->symbol->string);
1998 static declaration_t *parse_parameter(void)
2000 declaration_specifiers_t specifiers;
2001 memset(&specifiers, 0, sizeof(specifiers));
2003 parse_declaration_specifiers(&specifiers);
2005 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
2007 semantic_parameter(declaration);
2012 static declaration_t *parse_parameters(function_type_t *type)
2014 if(token.type == T_IDENTIFIER) {
2015 symbol_t *symbol = token.v.symbol;
2016 if(!is_typedef_symbol(symbol)) {
2017 type->kr_style_parameters = true;
2018 return parse_identifier_list();
2022 if(token.type == ')') {
2023 type->unspecified_parameters = 1;
2026 if(token.type == T_void && look_ahead(1)->type == ')') {
2031 declaration_t *declarations = NULL;
2032 declaration_t *declaration;
2033 declaration_t *last_declaration = NULL;
2034 function_parameter_t *parameter;
2035 function_parameter_t *last_parameter = NULL;
2038 switch(token.type) {
2042 return declarations;
2045 case T___extension__:
2047 declaration = parse_parameter();
2049 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
2050 memset(parameter, 0, sizeof(parameter[0]));
2051 parameter->type = declaration->type;
2053 if(last_parameter != NULL) {
2054 last_declaration->next = declaration;
2055 last_parameter->next = parameter;
2057 type->parameters = parameter;
2058 declarations = declaration;
2060 last_parameter = parameter;
2061 last_declaration = declaration;
2065 return declarations;
2067 if(token.type != ',')
2068 return declarations;
2078 } construct_type_type_t;
2080 typedef struct construct_type_t construct_type_t;
2081 struct construct_type_t {
2082 construct_type_type_t type;
2083 construct_type_t *next;
2086 typedef struct parsed_pointer_t parsed_pointer_t;
2087 struct parsed_pointer_t {
2088 construct_type_t construct_type;
2089 type_qualifiers_t type_qualifiers;
2092 typedef struct construct_function_type_t construct_function_type_t;
2093 struct construct_function_type_t {
2094 construct_type_t construct_type;
2095 type_t *function_type;
2098 typedef struct parsed_array_t parsed_array_t;
2099 struct parsed_array_t {
2100 construct_type_t construct_type;
2101 type_qualifiers_t type_qualifiers;
2107 typedef struct construct_base_type_t construct_base_type_t;
2108 struct construct_base_type_t {
2109 construct_type_t construct_type;
2113 static construct_type_t *parse_pointer_declarator(void)
2117 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
2118 memset(pointer, 0, sizeof(pointer[0]));
2119 pointer->construct_type.type = CONSTRUCT_POINTER;
2120 pointer->type_qualifiers = parse_type_qualifiers();
2122 return (construct_type_t*) pointer;
2125 static construct_type_t *parse_array_declarator(void)
2129 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
2130 memset(array, 0, sizeof(array[0]));
2131 array->construct_type.type = CONSTRUCT_ARRAY;
2133 if(token.type == T_static) {
2134 array->is_static = true;
2138 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
2139 if(type_qualifiers != 0) {
2140 if(token.type == T_static) {
2141 array->is_static = true;
2145 array->type_qualifiers = type_qualifiers;
2147 if(token.type == '*' && look_ahead(1)->type == ']') {
2148 array->is_variable = true;
2150 } else if(token.type != ']') {
2151 array->size = parse_assignment_expression();
2156 return (construct_type_t*) array;
2159 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2163 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2165 declaration_t *parameters = parse_parameters(&type->function);
2166 if(declaration != NULL) {
2167 declaration->context.declarations = parameters;
2170 construct_function_type_t *construct_function_type =
2171 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2172 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2173 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2174 construct_function_type->function_type = type;
2178 return (construct_type_t*) construct_function_type;
2181 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2182 bool may_be_abstract)
2184 /* construct a single linked list of construct_type_t's which describe
2185 * how to construct the final declarator type */
2186 construct_type_t *first = NULL;
2187 construct_type_t *last = NULL;
2190 while(token.type == '*') {
2191 construct_type_t *type = parse_pointer_declarator();
2202 /* TODO: find out if this is correct */
2205 construct_type_t *inner_types = NULL;
2207 switch(token.type) {
2209 if(declaration == NULL) {
2210 parse_error("no identifier expected in typename");
2212 declaration->symbol = token.v.symbol;
2213 declaration->source_position = token.source_position;
2219 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2225 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2226 /* avoid a loop in the outermost scope, because eat_statement doesn't
2228 if(token.type == '}' && current_function == NULL) {
2236 construct_type_t *p = last;
2239 construct_type_t *type;
2240 switch(token.type) {
2242 type = parse_function_declarator(declaration);
2245 type = parse_array_declarator();
2248 goto declarator_finished;
2251 /* insert in the middle of the list (behind p) */
2253 type->next = p->next;
2264 declarator_finished:
2267 /* append inner_types at the end of the list, we don't to set last anymore
2268 * as it's not needed anymore */
2270 assert(first == NULL);
2271 first = inner_types;
2273 last->next = inner_types;
2279 static type_t *construct_declarator_type(construct_type_t *construct_list,
2282 construct_type_t *iter = construct_list;
2283 for( ; iter != NULL; iter = iter->next) {
2284 switch(iter->type) {
2285 case CONSTRUCT_INVALID:
2286 panic("invalid type construction found");
2287 case CONSTRUCT_FUNCTION: {
2288 construct_function_type_t *construct_function_type
2289 = (construct_function_type_t*) iter;
2291 type_t *function_type = construct_function_type->function_type;
2293 function_type->function.return_type = type;
2295 type = function_type;
2299 case CONSTRUCT_POINTER: {
2300 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2301 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2302 pointer_type->pointer.points_to = type;
2303 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2305 type = pointer_type;
2309 case CONSTRUCT_ARRAY: {
2310 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2311 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2313 array_type->base.qualifiers = parsed_array->type_qualifiers;
2314 array_type->array.element_type = type;
2315 array_type->array.is_static = parsed_array->is_static;
2316 array_type->array.is_variable = parsed_array->is_variable;
2317 array_type->array.size = parsed_array->size;
2324 type_t *hashed_type = typehash_insert(type);
2325 if(hashed_type != type) {
2326 /* the function type was constructed earlier freeing it here will
2327 * destroy other types... */
2328 if(iter->type != CONSTRUCT_FUNCTION) {
2338 static declaration_t *parse_declarator(
2339 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2341 type_t *type = specifiers->type;
2342 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2343 declaration->storage_class = specifiers->storage_class;
2344 declaration->decl_modifiers = specifiers->decl_modifiers;
2345 declaration->is_inline = specifiers->is_inline;
2347 construct_type_t *construct_type
2348 = parse_inner_declarator(declaration, may_be_abstract);
2349 declaration->type = construct_declarator_type(construct_type, type);
2351 if(construct_type != NULL) {
2352 obstack_free(&temp_obst, construct_type);
2358 static type_t *parse_abstract_declarator(type_t *base_type)
2360 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2362 type_t *result = construct_declarator_type(construct_type, base_type);
2363 if(construct_type != NULL) {
2364 obstack_free(&temp_obst, construct_type);
2370 static declaration_t *record_declaration(declaration_t *declaration)
2372 assert(declaration->parent_context == NULL);
2373 assert(context != NULL);
2375 symbol_t *symbol = declaration->symbol;
2376 if(symbol != NULL) {
2377 declaration_t *alias = environment_push(declaration);
2378 if(alias != declaration)
2381 declaration->parent_context = context;
2384 if(last_declaration != NULL) {
2385 last_declaration->next = declaration;
2387 context->declarations = declaration;
2389 last_declaration = declaration;
2394 static void parser_error_multiple_definition(declaration_t *declaration,
2395 const source_position_t source_position)
2397 parser_print_error_prefix_pos(source_position);
2398 fprintf(stderr, "multiple definition of symbol '%s'\n",
2399 declaration->symbol->string);
2400 parser_print_error_prefix_pos(declaration->source_position);
2401 fprintf(stderr, "this is the location of the previous definition.\n");
2404 static bool is_declaration_specifier(const token_t *token,
2405 bool only_type_specifiers)
2407 switch(token->type) {
2411 return is_typedef_symbol(token->v.symbol);
2413 case T___extension__:
2416 return !only_type_specifiers;
2423 static void parse_init_declarator_rest(declaration_t *declaration)
2427 type_t *orig_type = declaration->type;
2428 type_t *type = NULL;
2429 if(orig_type != NULL)
2430 type = skip_typeref(orig_type);
2432 if(declaration->init.initializer != NULL) {
2433 parser_error_multiple_definition(declaration, token.source_position);
2436 initializer_t *initializer = parse_initializer(type);
2438 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2439 * the array type size */
2440 if(type != NULL && is_type_array(type) && initializer != NULL) {
2441 array_type_t *array_type = &type->array;
2443 if(array_type->size == NULL) {
2444 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2446 cnst->base.datatype = type_size_t;
2448 switch (initializer->kind) {
2449 case INITIALIZER_LIST: {
2450 initializer_list_t *const list = &initializer->list;
2451 cnst->conste.v.int_value = list->len;
2455 case INITIALIZER_STRING: {
2456 initializer_string_t *const string = &initializer->string;
2457 cnst->conste.v.int_value = strlen(string->string) + 1;
2461 case INITIALIZER_WIDE_STRING: {
2462 initializer_wide_string_t *const string = &initializer->wide_string;
2463 cnst->conste.v.int_value = string->string.size;
2468 panic("invalid initializer type");
2471 array_type->size = cnst;
2475 if(type != NULL && is_type_function(type)) {
2476 parser_print_error_prefix_pos(declaration->source_position);
2477 fprintf(stderr, "initializers not allowed for function types at "
2478 "declator '%s' (type ", declaration->symbol->string);
2479 print_type_quoted(orig_type);
2480 fprintf(stderr, ")\n");
2482 declaration->init.initializer = initializer;
2486 /* parse rest of a declaration without any declarator */
2487 static void parse_anonymous_declaration_rest(
2488 const declaration_specifiers_t *specifiers,
2489 parsed_declaration_func finished_declaration)
2493 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2495 declaration->type = specifiers->type;
2496 declaration->storage_class = specifiers->storage_class;
2497 declaration->source_position = specifiers->source_position;
2499 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2500 parse_warning_pos(declaration->source_position,
2501 "useless storage class in empty declaration");
2504 type_t *type = declaration->type;
2505 switch (type->kind) {
2506 case TYPE_COMPOUND_STRUCT:
2507 case TYPE_COMPOUND_UNION: {
2508 const compound_type_t *compound_type = &type->compound;
2509 if (compound_type->declaration->symbol == NULL) {
2510 parse_warning_pos(declaration->source_position,
2511 "unnamed struct/union that defines no instances");
2520 parse_warning_pos(declaration->source_position,
2521 "empty declaration");
2525 finished_declaration(declaration);
2528 static void parse_declaration_rest(declaration_t *ndeclaration,
2529 const declaration_specifiers_t *specifiers,
2530 parsed_declaration_func finished_declaration)
2533 declaration_t *declaration = finished_declaration(ndeclaration);
2535 type_t *orig_type = declaration->type;
2536 type_t *type = skip_typeref(orig_type);
2538 if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
2539 parser_print_warning_prefix_pos(declaration->source_position);
2540 fprintf(stderr, "variable '%s' declared 'inline'\n",
2541 declaration->symbol->string);
2544 if(token.type == '=') {
2545 parse_init_declarator_rest(declaration);
2548 if(token.type != ',')
2552 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2557 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2559 /* TODO: check that it was actually a parameter that gets a type */
2561 /* we should have a declaration for the parameter in the current
2563 return record_declaration(declaration);
2566 static void parse_declaration(parsed_declaration_func finished_declaration)
2568 declaration_specifiers_t specifiers;
2569 memset(&specifiers, 0, sizeof(specifiers));
2570 parse_declaration_specifiers(&specifiers);
2572 if(token.type == ';') {
2573 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2575 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2576 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2580 static void parse_kr_declaration_list(declaration_t *declaration)
2582 type_t *type = skip_typeref(declaration->type);
2583 if(!is_type_function(type))
2586 if(!type->function.kr_style_parameters)
2589 /* push function parameters */
2590 int top = environment_top();
2591 context_t *last_context = context;
2592 set_context(&declaration->context);
2594 declaration_t *parameter = declaration->context.declarations;
2595 for( ; parameter != NULL; parameter = parameter->next) {
2596 environment_push(parameter);
2599 /* parse declaration list */
2600 while(is_declaration_specifier(&token, false)) {
2601 parse_declaration(finished_kr_declaration);
2604 /* pop function parameters */
2605 assert(context == &declaration->context);
2606 set_context(last_context);
2607 environment_pop_to(top);
2609 /* update function type */
2610 type_t *new_type = duplicate_type(type);
2611 new_type->function.kr_style_parameters = false;
2613 function_parameter_t *parameters = NULL;
2614 function_parameter_t *last_parameter = NULL;
2616 declaration_t *parameter_declaration = declaration->context.declarations;
2617 for( ; parameter_declaration != NULL;
2618 parameter_declaration = parameter_declaration->next) {
2619 type_t *parameter_type = parameter_declaration->type;
2620 if(parameter_type == NULL) {
2622 parser_print_error_prefix();
2623 fprintf(stderr, "no type specified for function parameter '%s'\n",
2624 parameter_declaration->symbol->string);
2626 parser_print_warning_prefix();
2627 fprintf(stderr, "no type specified for function parameter '%s', "
2628 "using int\n", parameter_declaration->symbol->string);
2629 parameter_type = type_int;
2630 parameter_declaration->type = parameter_type;
2634 semantic_parameter(parameter_declaration);
2635 parameter_type = parameter_declaration->type;
2637 function_parameter_t *function_parameter
2638 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2639 memset(function_parameter, 0, sizeof(function_parameter[0]));
2641 function_parameter->type = parameter_type;
2642 if(last_parameter != NULL) {
2643 last_parameter->next = function_parameter;
2645 parameters = function_parameter;
2647 last_parameter = function_parameter;
2649 new_type->function.parameters = parameters;
2651 type = typehash_insert(new_type);
2652 if(type != new_type) {
2653 obstack_free(type_obst, new_type);
2656 declaration->type = type;
2659 static void parse_external_declaration(void)
2661 /* function-definitions and declarations both start with declaration
2663 declaration_specifiers_t specifiers;
2664 memset(&specifiers, 0, sizeof(specifiers));
2665 parse_declaration_specifiers(&specifiers);
2667 /* must be a declaration */
2668 if(token.type == ';') {
2669 parse_anonymous_declaration_rest(&specifiers, record_declaration);
2673 /* declarator is common to both function-definitions and declarations */
2674 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2676 /* must be a declaration */
2677 if(token.type == ',' || token.type == '=' || token.type == ';') {
2678 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2682 /* must be a function definition */
2683 parse_kr_declaration_list(ndeclaration);
2685 if(token.type != '{') {
2686 parse_error_expected("while parsing function definition", '{', 0);
2691 type_t *type = ndeclaration->type;
2697 /* note that we don't skip typerefs: the standard doesn't allow them here
2698 * (so we can't use is_type_function here) */
2699 if(type->kind != TYPE_FUNCTION) {
2700 parser_print_error_prefix();
2701 fprintf(stderr, "declarator '");
2702 print_type_ext(type, ndeclaration->symbol, NULL);
2703 fprintf(stderr, "' has a body but is not a function type.\n");
2708 /* § 6.7.5.3 (14) a function definition with () means no
2709 * parameters (and not unspecified parameters) */
2710 if(type->function.unspecified_parameters) {
2711 type_t *duplicate = duplicate_type(type);
2712 duplicate->function.unspecified_parameters = false;
2714 type = typehash_insert(duplicate);
2715 if(type != duplicate) {
2716 obstack_free(type_obst, duplicate);
2718 ndeclaration->type = type;
2721 declaration_t *declaration = record_declaration(ndeclaration);
2722 if(ndeclaration != declaration) {
2723 memcpy(&declaration->context, &ndeclaration->context,
2724 sizeof(declaration->context));
2726 type = skip_typeref(declaration->type);
2728 /* push function parameters and switch context */
2729 int top = environment_top();
2730 context_t *last_context = context;
2731 set_context(&declaration->context);
2733 declaration_t *parameter = declaration->context.declarations;
2734 for( ; parameter != NULL; parameter = parameter->next) {
2735 environment_push(parameter);
2738 if(declaration->init.statement != NULL) {
2739 parser_error_multiple_definition(declaration, token.source_position);
2741 goto end_of_parse_external_declaration;
2743 /* parse function body */
2744 int label_stack_top = label_top();
2745 declaration_t *old_current_function = current_function;
2746 current_function = declaration;
2748 declaration->init.statement = parse_compound_statement();
2750 assert(current_function == declaration);
2751 current_function = old_current_function;
2752 label_pop_to(label_stack_top);
2755 end_of_parse_external_declaration:
2756 assert(context == &declaration->context);
2757 set_context(last_context);
2758 environment_pop_to(top);
2761 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2764 if(token.type == ':') {
2766 parse_constant_expression();
2767 /* TODO (bitfields) */
2769 declaration_t *declaration = parse_declarator(specifiers, /*may_be_abstract=*/true);
2771 /* TODO: check constraints for struct declarations */
2772 /* TODO: check for doubled fields */
2773 record_declaration(declaration);
2775 if(token.type == ':') {
2777 parse_constant_expression();
2778 /* TODO (bitfields) */
2782 if(token.type != ',')
2789 static void parse_compound_type_entries(void)
2793 while(token.type != '}' && token.type != T_EOF) {
2794 declaration_specifiers_t specifiers;
2795 memset(&specifiers, 0, sizeof(specifiers));
2796 parse_declaration_specifiers(&specifiers);
2798 parse_struct_declarators(&specifiers);
2800 if(token.type == T_EOF) {
2801 parse_error("EOF while parsing struct");
2806 static type_t *parse_typename(void)
2808 declaration_specifiers_t specifiers;
2809 memset(&specifiers, 0, sizeof(specifiers));
2810 parse_declaration_specifiers(&specifiers);
2811 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2812 /* TODO: improve error message, user does probably not know what a
2813 * storage class is...
2815 parse_error("typename may not have a storage class");
2818 type_t *result = parse_abstract_declarator(specifiers.type);
2826 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2827 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2828 expression_t *left);
2830 typedef struct expression_parser_function_t expression_parser_function_t;
2831 struct expression_parser_function_t {
2832 unsigned precedence;
2833 parse_expression_function parser;
2834 unsigned infix_precedence;
2835 parse_expression_infix_function infix_parser;
2838 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2840 static expression_t *create_invalid_expression(void)
2842 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2843 expression->base.source_position = token.source_position;
2847 static expression_t *expected_expression_error(void)
2849 parser_print_error_prefix();
2850 fprintf(stderr, "expected expression, got token ");
2851 print_token(stderr, &token);
2852 fprintf(stderr, "\n");
2856 return create_invalid_expression();
2859 static expression_t *parse_string_const(void)
2861 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2862 cnst->base.datatype = type_string;
2863 cnst->string.value = parse_string_literals();
2868 static expression_t *parse_wide_string_const(void)
2870 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2871 cnst->base.datatype = type_wchar_t_ptr;
2872 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2877 static expression_t *parse_int_const(void)
2879 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2880 cnst->base.datatype = token.datatype;
2881 cnst->conste.v.int_value = token.v.intvalue;
2888 static expression_t *parse_float_const(void)
2890 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2891 cnst->base.datatype = token.datatype;
2892 cnst->conste.v.float_value = token.v.floatvalue;
2899 static declaration_t *create_implicit_function(symbol_t *symbol,
2900 const source_position_t source_position)
2902 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
2903 ntype->function.return_type = type_int;
2904 ntype->function.unspecified_parameters = true;
2906 type_t *type = typehash_insert(ntype);
2911 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2913 declaration->storage_class = STORAGE_CLASS_EXTERN;
2914 declaration->type = type;
2915 declaration->symbol = symbol;
2916 declaration->source_position = source_position;
2918 /* prepend the implicit definition to the global context
2919 * this is safe since the symbol wasn't declared as anything else yet
2921 assert(symbol->declaration == NULL);
2923 context_t *last_context = context;
2924 context = global_context;
2926 environment_push(declaration);
2927 declaration->next = context->declarations;
2928 context->declarations = declaration;
2930 context = last_context;
2935 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
2937 function_parameter_t *parameter
2938 = obstack_alloc(type_obst, sizeof(parameter[0]));
2939 memset(parameter, 0, sizeof(parameter[0]));
2940 parameter->type = argument_type;
2942 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2943 type->function.return_type = return_type;
2944 type->function.parameters = parameter;
2946 type_t *result = typehash_insert(type);
2947 if(result != type) {
2954 static type_t *get_builtin_symbol_type(symbol_t *symbol)
2956 switch(symbol->ID) {
2957 case T___builtin_alloca:
2958 return make_function_1_type(type_void_ptr, type_size_t);
2959 case T___builtin_nan:
2960 return make_function_1_type(type_double, type_string);
2961 case T___builtin_nanf:
2962 return make_function_1_type(type_float, type_string);
2963 case T___builtin_nand:
2964 return make_function_1_type(type_long_double, type_string);
2965 case T___builtin_va_end:
2966 return make_function_1_type(type_void, type_valist);
2968 panic("not implemented builtin symbol found");
2973 * performs automatic type cast as described in § 6.3.2.1
2975 static type_t *automatic_type_conversion(type_t *orig_type)
2977 if(orig_type == NULL)
2980 type_t *type = skip_typeref(orig_type);
2981 if(is_type_array(type)) {
2982 array_type_t *array_type = &type->array;
2983 type_t *element_type = array_type->element_type;
2984 unsigned qualifiers = array_type->type.qualifiers;
2986 return make_pointer_type(element_type, qualifiers);
2989 if(is_type_function(type)) {
2990 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
2997 * reverts the automatic casts of array to pointer types and function
2998 * to function-pointer types as defined § 6.3.2.1
3000 type_t *revert_automatic_type_conversion(const expression_t *expression)
3002 if(expression->base.datatype == NULL)
3005 switch(expression->kind) {
3006 case EXPR_REFERENCE: {
3007 const reference_expression_t *ref = &expression->reference;
3008 return ref->declaration->type;
3011 const select_expression_t *select = &expression->select;
3012 return select->compound_entry->type;
3014 case EXPR_UNARY_DEREFERENCE: {
3015 expression_t *value = expression->unary.value;
3016 type_t *type = skip_typeref(value->base.datatype);
3017 pointer_type_t *pointer_type = &type->pointer;
3019 return pointer_type->points_to;
3021 case EXPR_BUILTIN_SYMBOL: {
3022 const builtin_symbol_expression_t *builtin
3023 = &expression->builtin_symbol;
3024 return get_builtin_symbol_type(builtin->symbol);
3026 case EXPR_ARRAY_ACCESS: {
3027 const array_access_expression_t *array_access
3028 = &expression->array_access;
3029 const expression_t *array_ref = array_access->array_ref;
3030 type_t *type_left = skip_typeref(array_ref->base.datatype);
3031 assert(is_type_pointer(type_left));
3032 pointer_type_t *pointer_type = &type_left->pointer;
3033 return pointer_type->points_to;
3040 return expression->base.datatype;
3043 static expression_t *parse_reference(void)
3045 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3047 reference_expression_t *ref = &expression->reference;
3048 ref->symbol = token.v.symbol;
3050 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3052 source_position_t source_position = token.source_position;
3055 if(declaration == NULL) {
3057 /* an implicitly defined function */
3058 if(token.type == '(') {
3059 parser_print_prefix_pos(token.source_position);
3060 fprintf(stderr, "warning: implicit declaration of function '%s'\n",
3061 ref->symbol->string);
3063 declaration = create_implicit_function(ref->symbol,
3068 parser_print_error_prefix();
3069 fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string);
3074 type_t *type = declaration->type;
3075 /* we always do the auto-type conversions; the & and sizeof parser contains
3076 * code to revert this! */
3077 type = automatic_type_conversion(type);
3079 ref->declaration = declaration;
3080 ref->expression.datatype = type;
3085 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3089 /* TODO check if explicit cast is allowed and issue warnings/errors */
3092 static expression_t *parse_cast(void)
3094 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3096 cast->base.source_position = token.source_position;
3098 type_t *type = parse_typename();
3101 expression_t *value = parse_sub_expression(20);
3103 check_cast_allowed(value, type);
3105 cast->base.datatype = type;
3106 cast->unary.value = value;
3111 static expression_t *parse_statement_expression(void)
3113 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3115 statement_t *statement = parse_compound_statement();
3116 expression->statement.statement = statement;
3117 if(statement == NULL) {
3122 assert(statement->kind == STATEMENT_COMPOUND);
3123 compound_statement_t *compound_statement = &statement->compound;
3125 /* find last statement and use it's type */
3126 const statement_t *last_statement = NULL;
3127 const statement_t *iter = compound_statement->statements;
3128 for( ; iter != NULL; iter = iter->base.next) {
3129 last_statement = iter;
3132 if(last_statement->kind == STATEMENT_EXPRESSION) {
3133 const expression_statement_t *expression_statement
3134 = &last_statement->expression;
3135 expression->base.datatype
3136 = expression_statement->expression->base.datatype;
3138 expression->base.datatype = type_void;
3146 static expression_t *parse_brace_expression(void)
3150 switch(token.type) {
3152 /* gcc extension: a stement expression */
3153 return parse_statement_expression();
3157 return parse_cast();
3159 if(is_typedef_symbol(token.v.symbol)) {
3160 return parse_cast();
3164 expression_t *result = parse_expression();
3170 static expression_t *parse_function_keyword(void)
3175 if (current_function == NULL) {
3176 parse_error("'__func__' used outside of a function");
3179 string_literal_expression_t *expression
3180 = allocate_ast_zero(sizeof(expression[0]));
3182 expression->expression.kind = EXPR_FUNCTION;
3183 expression->expression.datatype = type_string;
3184 expression->value = current_function->symbol->string;
3186 return (expression_t*) expression;
3189 static expression_t *parse_pretty_function_keyword(void)
3191 eat(T___PRETTY_FUNCTION__);
3194 if (current_function == NULL) {
3195 parse_error("'__PRETTY_FUNCTION__' used outside of a function");
3198 string_literal_expression_t *expression
3199 = allocate_ast_zero(sizeof(expression[0]));
3201 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3202 expression->expression.datatype = type_string;
3203 expression->value = current_function->symbol->string;
3205 return (expression_t*) expression;
3208 static designator_t *parse_designator(void)
3210 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3212 if(token.type != T_IDENTIFIER) {
3213 parse_error_expected("while parsing member designator",
3218 result->symbol = token.v.symbol;
3221 designator_t *last_designator = result;
3223 if(token.type == '.') {
3225 if(token.type != T_IDENTIFIER) {
3226 parse_error_expected("while parsing member designator",
3231 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3232 designator->symbol = token.v.symbol;
3235 last_designator->next = designator;
3236 last_designator = designator;
3239 if(token.type == '[') {
3241 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3242 designator->array_access = parse_expression();
3243 if(designator->array_access == NULL) {
3249 last_designator->next = designator;
3250 last_designator = designator;
3259 static expression_t *parse_offsetof(void)
3261 eat(T___builtin_offsetof);
3263 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3264 expression->base.datatype = type_size_t;
3267 expression->offsetofe.type = parse_typename();
3269 expression->offsetofe.designator = parse_designator();
3275 static expression_t *parse_va_start(void)
3277 eat(T___builtin_va_start);
3279 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3282 expression->va_starte.ap = parse_assignment_expression();
3284 expression_t *const expr = parse_assignment_expression();
3285 if (expr->kind == EXPR_REFERENCE) {
3286 declaration_t *const decl = expr->reference.declaration;
3287 if (decl->parent_context == ¤t_function->context &&
3288 decl->next == NULL) {
3289 expression->va_starte.parameter = decl;
3294 parser_print_error_prefix_pos(expr->base.source_position);
3295 fprintf(stderr, "second argument of 'va_start' must be last parameter "
3296 "of the current function\n");
3298 return create_invalid_expression();
3301 static expression_t *parse_va_arg(void)
3303 eat(T___builtin_va_arg);
3305 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3308 expression->va_arge.ap = parse_assignment_expression();
3310 expression->base.datatype = parse_typename();
3316 static expression_t *parse_builtin_symbol(void)
3318 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3320 symbol_t *symbol = token.v.symbol;
3322 expression->builtin_symbol.symbol = symbol;
3325 type_t *type = get_builtin_symbol_type(symbol);
3326 type = automatic_type_conversion(type);
3328 expression->base.datatype = type;
3332 static expression_t *parse_compare_builtin(void)
3334 expression_t *expression;
3336 switch(token.type) {
3337 case T___builtin_isgreater:
3338 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3340 case T___builtin_isgreaterequal:
3341 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3343 case T___builtin_isless:
3344 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3346 case T___builtin_islessequal:
3347 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3349 case T___builtin_islessgreater:
3350 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3352 case T___builtin_isunordered:
3353 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3356 panic("invalid compare builtin found");
3362 expression->binary.left = parse_assignment_expression();
3364 expression->binary.right = parse_assignment_expression();
3367 type_t *orig_type_left = expression->binary.left->base.datatype;
3368 type_t *orig_type_right = expression->binary.right->base.datatype;
3369 if(orig_type_left == NULL || orig_type_right == NULL)
3372 type_t *type_left = skip_typeref(orig_type_left);
3373 type_t *type_right = skip_typeref(orig_type_right);
3374 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3375 type_error_incompatible("invalid operands in comparison",
3376 token.source_position, type_left, type_right);
3378 semantic_comparison(&expression->binary);
3384 static expression_t *parse_builtin_expect(void)
3386 eat(T___builtin_expect);
3388 expression_t *expression
3389 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3392 expression->binary.left = parse_assignment_expression();
3394 expression->binary.right = parse_constant_expression();
3397 expression->base.datatype = expression->binary.left->base.datatype;
3402 static expression_t *parse_assume(void) {
3405 expression_t *expression
3406 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3409 expression->unary.value = parse_expression();
3412 expression->base.datatype = type_void;
3416 static expression_t *parse_primary_expression(void)
3418 switch(token.type) {
3420 return parse_int_const();
3421 case T_FLOATINGPOINT:
3422 return parse_float_const();
3423 case T_STRING_LITERAL: /* TODO merge */
3424 return parse_string_const();
3425 case T_WIDE_STRING_LITERAL:
3426 return parse_wide_string_const();
3428 return parse_reference();
3429 case T___FUNCTION__:
3431 return parse_function_keyword();
3432 case T___PRETTY_FUNCTION__:
3433 return parse_pretty_function_keyword();
3434 case T___builtin_offsetof:
3435 return parse_offsetof();
3436 case T___builtin_va_start:
3437 return parse_va_start();
3438 case T___builtin_va_arg:
3439 return parse_va_arg();
3440 case T___builtin_expect:
3441 return parse_builtin_expect();
3442 case T___builtin_nanf:
3443 case T___builtin_alloca:
3444 case T___builtin_va_end:
3445 return parse_builtin_symbol();
3446 case T___builtin_isgreater:
3447 case T___builtin_isgreaterequal:
3448 case T___builtin_isless:
3449 case T___builtin_islessequal:
3450 case T___builtin_islessgreater:
3451 case T___builtin_isunordered:
3452 return parse_compare_builtin();
3454 return parse_assume();
3457 return parse_brace_expression();
3460 parser_print_error_prefix();
3461 fprintf(stderr, "unexpected token ");
3462 print_token(stderr, &token);
3463 fprintf(stderr, "\n");
3466 return create_invalid_expression();
3469 static expression_t *parse_array_expression(unsigned precedence,
3476 expression_t *inside = parse_expression();
3478 array_access_expression_t *array_access
3479 = allocate_ast_zero(sizeof(array_access[0]));
3481 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3483 type_t *type_left = left->base.datatype;
3484 type_t *type_inside = inside->base.datatype;
3485 type_t *return_type = NULL;
3487 if(type_left != NULL && type_inside != NULL) {
3488 type_left = skip_typeref(type_left);
3489 type_inside = skip_typeref(type_inside);
3491 if(is_type_pointer(type_left)) {
3492 pointer_type_t *pointer = &type_left->pointer;
3493 return_type = pointer->points_to;
3494 array_access->array_ref = left;
3495 array_access->index = inside;
3496 } else if(is_type_pointer(type_inside)) {
3497 pointer_type_t *pointer = &type_inside->pointer;
3498 return_type = pointer->points_to;
3499 array_access->array_ref = inside;
3500 array_access->index = left;
3501 array_access->flipped = true;
3503 parser_print_error_prefix();
3504 fprintf(stderr, "array access on object with non-pointer types ");
3505 print_type_quoted(type_left);
3506 fprintf(stderr, ", ");
3507 print_type_quoted(type_inside);
3508 fprintf(stderr, "\n");
3511 array_access->array_ref = left;
3512 array_access->index = inside;
3515 if(token.type != ']') {
3516 parse_error_expected("Problem while parsing array access", ']', 0);
3517 return (expression_t*) array_access;
3521 return_type = automatic_type_conversion(return_type);
3522 array_access->expression.datatype = return_type;
3524 return (expression_t*) array_access;
3527 static expression_t *parse_sizeof(unsigned precedence)
3531 sizeof_expression_t *sizeof_expression
3532 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3533 sizeof_expression->expression.kind = EXPR_SIZEOF;
3534 sizeof_expression->expression.datatype = type_size_t;
3536 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3538 sizeof_expression->type = parse_typename();
3541 expression_t *expression = parse_sub_expression(precedence);
3542 expression->base.datatype = revert_automatic_type_conversion(expression);
3544 sizeof_expression->type = expression->base.datatype;
3545 sizeof_expression->size_expression = expression;
3548 return (expression_t*) sizeof_expression;
3551 static expression_t *parse_select_expression(unsigned precedence,
3552 expression_t *compound)
3555 assert(token.type == '.' || token.type == T_MINUSGREATER);
3557 bool is_pointer = (token.type == T_MINUSGREATER);
3560 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3561 select->select.compound = compound;
3563 if(token.type != T_IDENTIFIER) {
3564 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3567 symbol_t *symbol = token.v.symbol;
3568 select->select.symbol = symbol;
3571 type_t *orig_type = compound->base.datatype;
3572 if(orig_type == NULL)
3573 return create_invalid_expression();
3575 type_t *type = skip_typeref(orig_type);
3577 type_t *type_left = type;
3579 if(type->kind != TYPE_POINTER) {
3580 parser_print_error_prefix();
3581 fprintf(stderr, "left hand side of '->' is not a pointer, but ");
3582 print_type_quoted(orig_type);
3583 fputc('\n', stderr);
3584 return create_invalid_expression();
3586 pointer_type_t *pointer_type = &type->pointer;
3587 type_left = pointer_type->points_to;
3589 type_left = skip_typeref(type_left);
3591 if(type_left->kind != TYPE_COMPOUND_STRUCT
3592 && type_left->kind != TYPE_COMPOUND_UNION) {
3593 parser_print_error_prefix();
3594 fprintf(stderr, "request for member '%s' in something not a struct or "
3595 "union, but ", symbol->string);
3596 print_type_quoted(type_left);
3597 fputc('\n', stderr);
3598 return create_invalid_expression();
3601 compound_type_t *compound_type = &type_left->compound;
3602 declaration_t *declaration = compound_type->declaration;
3604 if(!declaration->init.is_defined) {
3605 parser_print_error_prefix();
3606 fprintf(stderr, "request for member '%s' of incomplete type ",
3608 print_type_quoted(type_left);
3609 fputc('\n', stderr);
3610 return create_invalid_expression();
3613 declaration_t *iter = declaration->context.declarations;
3614 for( ; iter != NULL; iter = iter->next) {
3615 if(iter->symbol == symbol) {
3620 parser_print_error_prefix();
3621 print_type_quoted(type_left);
3622 fprintf(stderr, " has no member named '%s'\n", symbol->string);
3623 return create_invalid_expression();
3626 /* we always do the auto-type conversions; the & and sizeof parser contains
3627 * code to revert this! */
3628 type_t *expression_type = automatic_type_conversion(iter->type);
3630 select->select.compound_entry = iter;
3631 select->base.datatype = expression_type;
3635 static expression_t *parse_call_expression(unsigned precedence,
3636 expression_t *expression)
3639 expression_t *result = allocate_expression_zero(EXPR_CALL);
3641 call_expression_t *call = &result->call;
3642 call->function = expression;
3644 function_type_t *function_type = NULL;
3645 type_t *orig_type = expression->base.datatype;
3646 if(orig_type != NULL) {
3647 type_t *type = skip_typeref(orig_type);
3649 if(is_type_pointer(type)) {
3650 pointer_type_t *pointer_type = &type->pointer;
3652 type = skip_typeref(pointer_type->points_to);
3654 if (is_type_function(type)) {
3655 function_type = &type->function;
3656 call->expression.datatype = function_type->return_type;
3659 if(function_type == NULL) {
3660 parser_print_error_prefix();
3661 fputs("called object '", stderr);
3662 print_expression(expression);
3663 fputs("' (type ", stderr);
3664 print_type_quoted(orig_type);
3665 fputs(") is not a pointer to a function\n", stderr);
3667 function_type = NULL;
3668 call->expression.datatype = NULL;
3672 /* parse arguments */
3675 if(token.type != ')') {
3676 call_argument_t *last_argument = NULL;
3679 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3681 argument->expression = parse_assignment_expression();
3682 if(last_argument == NULL) {
3683 call->arguments = argument;
3685 last_argument->next = argument;
3687 last_argument = argument;
3689 if(token.type != ',')
3696 if(function_type != NULL) {
3697 function_parameter_t *parameter = function_type->parameters;
3698 call_argument_t *argument = call->arguments;
3699 for( ; parameter != NULL && argument != NULL;
3700 parameter = parameter->next, argument = argument->next) {
3701 type_t *expected_type = parameter->type;
3702 /* TODO report context in error messages */
3703 argument->expression = create_implicit_cast(argument->expression,
3706 /* too few parameters */
3707 if(parameter != NULL) {
3708 parser_print_error_prefix();
3709 fprintf(stderr, "too few arguments to function '");
3710 print_expression(expression);
3711 fprintf(stderr, "'\n");
3712 } else if(argument != NULL) {
3713 /* too many parameters */
3714 if(!function_type->variadic
3715 && !function_type->unspecified_parameters) {
3716 parser_print_error_prefix();
3717 fprintf(stderr, "too many arguments to function '");
3718 print_expression(expression);
3719 fprintf(stderr, "'\n");
3721 /* do default promotion */
3722 for( ; argument != NULL; argument = argument->next) {
3723 type_t *type = argument->expression->base.datatype;
3728 type = skip_typeref(type);
3729 if(is_type_integer(type)) {
3730 type = promote_integer(type);
3731 } else if(type == type_float) {
3735 argument->expression
3736 = create_implicit_cast(argument->expression, type);
3739 check_format(&result->call);
3742 check_format(&result->call);
3749 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3751 static bool same_compound_type(const type_t *type1, const type_t *type2)
3753 if(!is_type_compound(type1))
3755 if(type1->kind != type2->kind)
3758 const compound_type_t *compound1 = &type1->compound;
3759 const compound_type_t *compound2 = &type2->compound;
3761 return compound1->declaration == compound2->declaration;
3764 static expression_t *parse_conditional_expression(unsigned precedence,
3765 expression_t *expression)
3769 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3771 conditional_expression_t *conditional = &result->conditional;
3772 conditional->condition = expression;
3775 type_t *condition_type_orig = expression->base.datatype;
3776 if(condition_type_orig != NULL) {
3777 type_t *condition_type = skip_typeref(condition_type_orig);
3778 if(condition_type != NULL && !is_type_scalar(condition_type)) {
3779 type_error("expected a scalar type in conditional condition",
3780 expression->base.source_position, condition_type_orig);
3784 expression_t *true_expression = parse_expression();
3786 expression_t *false_expression = parse_sub_expression(precedence);
3788 conditional->true_expression = true_expression;
3789 conditional->false_expression = false_expression;
3791 type_t *orig_true_type = true_expression->base.datatype;
3792 type_t *orig_false_type = false_expression->base.datatype;
3793 if(orig_true_type == NULL || orig_false_type == NULL)
3796 type_t *true_type = skip_typeref(orig_true_type);
3797 type_t *false_type = skip_typeref(orig_false_type);
3800 type_t *result_type = NULL;
3801 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3802 result_type = semantic_arithmetic(true_type, false_type);
3804 true_expression = create_implicit_cast(true_expression, result_type);
3805 false_expression = create_implicit_cast(false_expression, result_type);
3807 conditional->true_expression = true_expression;
3808 conditional->false_expression = false_expression;
3809 conditional->expression.datatype = result_type;
3810 } else if (same_compound_type(true_type, false_type)
3811 || (is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3812 is_type_atomic(false_type, ATOMIC_TYPE_VOID))) {
3813 /* just take 1 of the 2 types */
3814 result_type = true_type;
3815 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3816 && pointers_compatible(true_type, false_type)) {
3818 result_type = true_type;
3821 type_error_incompatible("while parsing conditional",
3822 expression->base.source_position, true_type,
3826 conditional->expression.datatype = result_type;
3830 static expression_t *parse_extension(unsigned precedence)
3832 eat(T___extension__);
3834 /* TODO enable extensions */
3836 return parse_sub_expression(precedence);
3839 static expression_t *parse_builtin_classify_type(const unsigned precedence)
3841 eat(T___builtin_classify_type);
3843 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
3844 result->base.datatype = type_int;
3847 expression_t *expression = parse_sub_expression(precedence);
3849 result->classify_type.type_expression = expression;
3854 static void semantic_incdec(unary_expression_t *expression)
3856 type_t *orig_type = expression->value->base.datatype;
3857 if(orig_type == NULL)
3860 type_t *type = skip_typeref(orig_type);
3861 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
3862 /* TODO: improve error message */
3863 parser_print_error_prefix();
3864 fprintf(stderr, "operation needs an arithmetic or pointer type\n");
3868 expression->expression.datatype = orig_type;
3871 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
3873 type_t *orig_type = expression->value->base.datatype;
3874 if(orig_type == NULL)
3877 type_t *type = skip_typeref(orig_type);
3878 if(!is_type_arithmetic(type)) {
3879 /* TODO: improve error message */
3880 parser_print_error_prefix();
3881 fprintf(stderr, "operation needs an arithmetic type\n");
3885 expression->expression.datatype = orig_type;
3888 static void semantic_unexpr_scalar(unary_expression_t *expression)
3890 type_t *orig_type = expression->value->base.datatype;
3891 if(orig_type == NULL)
3894 type_t *type = skip_typeref(orig_type);
3895 if (!is_type_scalar(type)) {
3896 parse_error("operand of ! must be of scalar type\n");
3900 expression->expression.datatype = orig_type;
3903 static void semantic_unexpr_integer(unary_expression_t *expression)
3905 type_t *orig_type = expression->value->base.datatype;
3906 if(orig_type == NULL)
3909 type_t *type = skip_typeref(orig_type);
3910 if (!is_type_integer(type)) {
3911 parse_error("operand of ~ must be of integer type\n");
3915 expression->expression.datatype = orig_type;
3918 static void semantic_dereference(unary_expression_t *expression)
3920 type_t *orig_type = expression->value->base.datatype;
3921 if(orig_type == NULL)
3924 type_t *type = skip_typeref(orig_type);
3925 if(!is_type_pointer(type)) {
3926 parser_print_error_prefix();
3927 fputs("Unary '*' needs pointer or arrray type, but type ", stderr);
3928 print_type_quoted(orig_type);
3929 fputs(" given.\n", stderr);
3933 pointer_type_t *pointer_type = &type->pointer;
3934 type_t *result_type = pointer_type->points_to;
3936 result_type = automatic_type_conversion(result_type);
3937 expression->expression.datatype = result_type;
3940 static void semantic_take_addr(unary_expression_t *expression)
3942 expression_t *value = expression->value;
3943 value->base.datatype = revert_automatic_type_conversion(value);
3945 type_t *orig_type = value->base.datatype;
3946 if(orig_type == NULL)
3949 if(value->kind == EXPR_REFERENCE) {
3950 reference_expression_t *reference = (reference_expression_t*) value;
3951 declaration_t *declaration = reference->declaration;
3952 if(declaration != NULL) {
3953 declaration->address_taken = 1;
3957 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3960 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
3961 static expression_t *parse_##unexpression_type(unsigned precedence) \
3965 expression_t *unary_expression \
3966 = allocate_expression_zero(unexpression_type); \
3967 unary_expression->unary.value = parse_sub_expression(precedence); \
3969 sfunc(&unary_expression->unary); \
3971 return unary_expression; \
3974 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
3975 semantic_unexpr_arithmetic)
3976 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
3977 semantic_unexpr_arithmetic)
3978 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
3979 semantic_unexpr_scalar)
3980 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
3981 semantic_dereference)
3982 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
3984 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
3985 semantic_unexpr_integer)
3986 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
3988 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
3991 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
3993 static expression_t *parse_##unexpression_type(unsigned precedence, \
3994 expression_t *left) \
3996 (void) precedence; \
3999 expression_t *unary_expression \
4000 = allocate_expression_zero(unexpression_type); \
4001 unary_expression->unary.value = left; \
4003 sfunc(&unary_expression->unary); \
4005 return unary_expression; \
4008 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4009 EXPR_UNARY_POSTFIX_INCREMENT,
4011 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4012 EXPR_UNARY_POSTFIX_DECREMENT,
4015 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4017 /* TODO: handle complex + imaginary types */
4019 /* § 6.3.1.8 Usual arithmetic conversions */
4020 if(type_left == type_long_double || type_right == type_long_double) {
4021 return type_long_double;
4022 } else if(type_left == type_double || type_right == type_double) {
4024 } else if(type_left == type_float || type_right == type_float) {
4028 type_right = promote_integer(type_right);
4029 type_left = promote_integer(type_left);
4031 if(type_left == type_right)
4034 bool signed_left = is_type_signed(type_left);
4035 bool signed_right = is_type_signed(type_right);
4036 int rank_left = get_rank(type_left);
4037 int rank_right = get_rank(type_right);
4038 if(rank_left < rank_right) {
4039 if(signed_left == signed_right || !signed_right) {
4045 if(signed_left == signed_right || !signed_left) {
4053 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4055 expression_t *left = expression->left;
4056 expression_t *right = expression->right;
4057 type_t *orig_type_left = left->base.datatype;
4058 type_t *orig_type_right = right->base.datatype;
4060 if(orig_type_left == NULL || orig_type_right == NULL)
4063 type_t *type_left = skip_typeref(orig_type_left);
4064 type_t *type_right = skip_typeref(orig_type_right);
4066 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4067 /* TODO: improve error message */
4068 parser_print_error_prefix();
4069 fprintf(stderr, "operation needs arithmetic types\n");
4073 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4074 expression->left = create_implicit_cast(left, arithmetic_type);
4075 expression->right = create_implicit_cast(right, arithmetic_type);
4076 expression->expression.datatype = arithmetic_type;
4079 static void semantic_shift_op(binary_expression_t *expression)
4081 expression_t *left = expression->left;
4082 expression_t *right = expression->right;
4083 type_t *orig_type_left = left->base.datatype;
4084 type_t *orig_type_right = right->base.datatype;
4086 if(orig_type_left == NULL || orig_type_right == NULL)
4089 type_t *type_left = skip_typeref(orig_type_left);
4090 type_t *type_right = skip_typeref(orig_type_right);
4092 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4093 /* TODO: improve error message */
4094 parser_print_error_prefix();
4095 fprintf(stderr, "operation needs integer types\n");
4099 type_left = promote_integer(type_left);
4100 type_right = promote_integer(type_right);
4102 expression->left = create_implicit_cast(left, type_left);
4103 expression->right = create_implicit_cast(right, type_right);
4104 expression->expression.datatype = type_left;
4107 static void semantic_add(binary_expression_t *expression)
4109 expression_t *left = expression->left;
4110 expression_t *right = expression->right;
4111 type_t *orig_type_left = left->base.datatype;
4112 type_t *orig_type_right = right->base.datatype;
4114 if(orig_type_left == NULL || orig_type_right == NULL)
4117 type_t *type_left = skip_typeref(orig_type_left);
4118 type_t *type_right = skip_typeref(orig_type_right);
4121 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4122 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4123 expression->left = create_implicit_cast(left, arithmetic_type);
4124 expression->right = create_implicit_cast(right, arithmetic_type);
4125 expression->expression.datatype = arithmetic_type;
4127 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4128 expression->expression.datatype = type_left;
4129 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4130 expression->expression.datatype = type_right;
4132 parser_print_error_prefix();
4133 fprintf(stderr, "invalid operands to binary + (");
4134 print_type_quoted(orig_type_left);
4135 fprintf(stderr, ", ");
4136 print_type_quoted(orig_type_right);
4137 fprintf(stderr, ")\n");
4141 static void semantic_sub(binary_expression_t *expression)
4143 expression_t *left = expression->left;
4144 expression_t *right = expression->right;
4145 type_t *orig_type_left = left->base.datatype;
4146 type_t *orig_type_right = right->base.datatype;
4148 if(orig_type_left == NULL || orig_type_right == NULL)
4151 type_t *type_left = skip_typeref(orig_type_left);
4152 type_t *type_right = skip_typeref(orig_type_right);
4155 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4156 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4157 expression->left = create_implicit_cast(left, arithmetic_type);
4158 expression->right = create_implicit_cast(right, arithmetic_type);
4159 expression->expression.datatype = arithmetic_type;
4161 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4162 expression->expression.datatype = type_left;
4163 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4164 if(!pointers_compatible(type_left, type_right)) {
4165 parser_print_error_prefix();
4166 fprintf(stderr, "pointers to incompatible objects to binary - (");
4167 print_type_quoted(orig_type_left);
4168 fprintf(stderr, ", ");
4169 print_type_quoted(orig_type_right);
4170 fprintf(stderr, ")\n");
4172 expression->expression.datatype = type_ptrdiff_t;
4175 parser_print_error_prefix();
4176 fprintf(stderr, "invalid operands to binary - (");
4177 print_type_quoted(orig_type_left);
4178 fprintf(stderr, ", ");
4179 print_type_quoted(orig_type_right);
4180 fprintf(stderr, ")\n");
4184 static void semantic_comparison(binary_expression_t *expression)
4186 expression_t *left = expression->left;
4187 expression_t *right = expression->right;
4188 type_t *orig_type_left = left->base.datatype;
4189 type_t *orig_type_right = right->base.datatype;
4191 if(orig_type_left == NULL || orig_type_right == NULL)
4194 type_t *type_left = skip_typeref(orig_type_left);
4195 type_t *type_right = skip_typeref(orig_type_right);
4197 /* TODO non-arithmetic types */
4198 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4199 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4200 expression->left = create_implicit_cast(left, arithmetic_type);
4201 expression->right = create_implicit_cast(right, arithmetic_type);
4202 expression->expression.datatype = arithmetic_type;
4203 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4204 /* TODO check compatibility */
4205 } else if (is_type_pointer(type_left)) {
4206 expression->right = create_implicit_cast(right, type_left);
4207 } else if (is_type_pointer(type_right)) {
4208 expression->left = create_implicit_cast(left, type_right);
4210 type_error_incompatible("invalid operands in comparison",
4211 token.source_position, type_left, type_right);
4213 expression->expression.datatype = type_int;
4216 static void semantic_arithmetic_assign(binary_expression_t *expression)
4218 expression_t *left = expression->left;
4219 expression_t *right = expression->right;
4220 type_t *orig_type_left = left->base.datatype;
4221 type_t *orig_type_right = right->base.datatype;
4223 if(orig_type_left == NULL || orig_type_right == NULL)
4226 type_t *type_left = skip_typeref(orig_type_left);
4227 type_t *type_right = skip_typeref(orig_type_right);
4229 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4230 /* TODO: improve error message */
4231 parser_print_error_prefix();
4232 fprintf(stderr, "operation needs arithmetic types\n");
4236 /* combined instructions are tricky. We can't create an implicit cast on
4237 * the left side, because we need the uncasted form for the store.
4238 * The ast2firm pass has to know that left_type must be right_type
4239 * for the arithmeitc operation and create a cast by itself */
4240 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4241 expression->right = create_implicit_cast(right, arithmetic_type);
4242 expression->expression.datatype = type_left;
4245 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4247 expression_t *left = expression->left;
4248 expression_t *right = expression->right;
4249 type_t *orig_type_left = left->base.datatype;
4250 type_t *orig_type_right = right->base.datatype;
4252 if(orig_type_left == NULL || orig_type_right == NULL)
4255 type_t *type_left = skip_typeref(orig_type_left);
4256 type_t *type_right = skip_typeref(orig_type_right);
4258 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4259 /* combined instructions are tricky. We can't create an implicit cast on
4260 * the left side, because we need the uncasted form for the store.
4261 * The ast2firm pass has to know that left_type must be right_type
4262 * for the arithmeitc operation and create a cast by itself */
4263 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4264 expression->right = create_implicit_cast(right, arithmetic_type);
4265 expression->expression.datatype = type_left;
4266 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4267 expression->expression.datatype = type_left;
4269 parser_print_error_prefix();
4270 fputs("Incompatible types ", stderr);
4271 print_type_quoted(orig_type_left);
4272 fputs(" and ", stderr);
4273 print_type_quoted(orig_type_right);
4274 fputs(" in assignment\n", stderr);
4279 static void semantic_logical_op(binary_expression_t *expression)
4281 expression_t *left = expression->left;
4282 expression_t *right = expression->right;
4283 type_t *orig_type_left = left->base.datatype;
4284 type_t *orig_type_right = right->base.datatype;
4286 if(orig_type_left == NULL || orig_type_right == NULL)
4289 type_t *type_left = skip_typeref(orig_type_left);
4290 type_t *type_right = skip_typeref(orig_type_right);
4292 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4293 /* TODO: improve error message */
4294 parser_print_error_prefix();
4295 fprintf(stderr, "operation needs scalar types\n");
4299 expression->expression.datatype = type_int;
4302 static bool has_const_fields(type_t *type)
4309 static void semantic_binexpr_assign(binary_expression_t *expression)
4311 expression_t *left = expression->left;
4312 type_t *orig_type_left = left->base.datatype;
4314 if(orig_type_left == NULL)
4317 type_t *type_left = revert_automatic_type_conversion(left);
4318 type_left = skip_typeref(orig_type_left);
4320 /* must be a modifiable lvalue */
4321 if (is_type_array(type_left)) {
4322 parser_print_error_prefix();
4323 fprintf(stderr, "Cannot assign to arrays ('");
4324 print_expression(left);
4325 fprintf(stderr, "')\n");
4328 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4329 parser_print_error_prefix();
4330 fprintf(stderr, "assignment to readonly location '");
4331 print_expression(left);
4332 fprintf(stderr, "' (type ");
4333 print_type_quoted(orig_type_left);
4334 fprintf(stderr, ")\n");
4337 if(is_type_incomplete(type_left)) {
4338 parser_print_error_prefix();
4339 fprintf(stderr, "left-hand side of assignment '");
4340 print_expression(left);
4341 fprintf(stderr, "' has incomplete type ");
4342 print_type_quoted(orig_type_left);
4343 fprintf(stderr, "\n");
4346 if(is_type_compound(type_left) && has_const_fields(type_left)) {
4347 parser_print_error_prefix();
4348 fprintf(stderr, "can't assign to '");
4349 print_expression(left);
4350 fprintf(stderr, "' because compound type ");
4351 print_type_quoted(orig_type_left);
4352 fprintf(stderr, " has readonly fields\n");
4356 semantic_assign(orig_type_left, &expression->right, "assignment");
4358 expression->expression.datatype = orig_type_left;
4361 static void semantic_comma(binary_expression_t *expression)
4363 expression->expression.datatype = expression->right->base.datatype;
4366 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4367 static expression_t *parse_##binexpression_type(unsigned precedence, \
4368 expression_t *left) \
4372 expression_t *right = parse_sub_expression(precedence + lr); \
4374 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4375 binexpr->binary.left = left; \
4376 binexpr->binary.right = right; \
4377 sfunc(&binexpr->binary); \
4382 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4383 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4384 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4385 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4386 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4387 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4388 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4389 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4390 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4392 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4393 semantic_comparison, 1)
4394 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4395 semantic_comparison, 1)
4396 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4397 semantic_comparison, 1)
4398 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4399 semantic_comparison, 1)
4401 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4402 semantic_binexpr_arithmetic, 1)
4403 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4404 semantic_binexpr_arithmetic, 1)
4405 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4406 semantic_binexpr_arithmetic, 1)
4407 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4408 semantic_logical_op, 1)
4409 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4410 semantic_logical_op, 1)
4411 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4412 semantic_shift_op, 1)
4413 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4414 semantic_shift_op, 1)
4415 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4416 semantic_arithmetic_addsubb_assign, 0)
4417 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4418 semantic_arithmetic_addsubb_assign, 0)
4419 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4420 semantic_arithmetic_assign, 0)
4421 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4422 semantic_arithmetic_assign, 0)
4423 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4424 semantic_arithmetic_assign, 0)
4425 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4426 semantic_arithmetic_assign, 0)
4427 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4428 semantic_arithmetic_assign, 0)
4429 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4430 semantic_arithmetic_assign, 0)
4431 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4432 semantic_arithmetic_assign, 0)
4433 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4434 semantic_arithmetic_assign, 0)
4436 static expression_t *parse_sub_expression(unsigned precedence)
4438 if(token.type < 0) {
4439 return expected_expression_error();
4442 expression_parser_function_t *parser
4443 = &expression_parsers[token.type];
4444 source_position_t source_position = token.source_position;
4447 if(parser->parser != NULL) {
4448 left = parser->parser(parser->precedence);
4450 left = parse_primary_expression();
4452 assert(left != NULL);
4453 left->base.source_position = source_position;
4456 if(token.type < 0) {
4457 return expected_expression_error();
4460 parser = &expression_parsers[token.type];
4461 if(parser->infix_parser == NULL)
4463 if(parser->infix_precedence < precedence)
4466 left = parser->infix_parser(parser->infix_precedence, left);
4468 assert(left != NULL);
4469 assert(left->kind != EXPR_UNKNOWN);
4470 left->base.source_position = source_position;
4476 static expression_t *parse_expression(void)
4478 return parse_sub_expression(1);
4483 static void register_expression_parser(parse_expression_function parser,
4484 int token_type, unsigned precedence)
4486 expression_parser_function_t *entry = &expression_parsers[token_type];
4488 if(entry->parser != NULL) {
4489 fprintf(stderr, "for token ");
4490 print_token_type(stderr, (token_type_t) token_type);
4491 fprintf(stderr, "\n");
4492 panic("trying to register multiple expression parsers for a token");
4494 entry->parser = parser;
4495 entry->precedence = precedence;
4498 static void register_infix_parser(parse_expression_infix_function parser,
4499 int token_type, unsigned precedence)
4501 expression_parser_function_t *entry = &expression_parsers[token_type];
4503 if(entry->infix_parser != NULL) {
4504 fprintf(stderr, "for token ");
4505 print_token_type(stderr, (token_type_t) token_type);
4506 fprintf(stderr, "\n");
4507 panic("trying to register multiple infix expression parsers for a "
4510 entry->infix_parser = parser;
4511 entry->infix_precedence = precedence;
4514 static void init_expression_parsers(void)
4516 memset(&expression_parsers, 0, sizeof(expression_parsers));
4518 register_infix_parser(parse_array_expression, '[', 30);
4519 register_infix_parser(parse_call_expression, '(', 30);
4520 register_infix_parser(parse_select_expression, '.', 30);
4521 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4522 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4524 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4527 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4528 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4529 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4530 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4531 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4532 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4533 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4534 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4535 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4536 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4537 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4538 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4539 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4540 T_EXCLAMATIONMARKEQUAL, 13);
4541 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4542 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4543 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4544 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4545 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4546 register_infix_parser(parse_conditional_expression, '?', 7);
4547 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4548 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4549 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4550 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4551 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4552 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4553 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4554 T_LESSLESSEQUAL, 2);
4555 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4556 T_GREATERGREATEREQUAL, 2);
4557 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4559 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4561 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4564 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4566 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4567 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4568 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4569 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4570 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4571 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4572 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4574 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4576 register_expression_parser(parse_sizeof, T_sizeof, 25);
4577 register_expression_parser(parse_extension, T___extension__, 25);
4578 register_expression_parser(parse_builtin_classify_type,
4579 T___builtin_classify_type, 25);
4582 static asm_constraint_t *parse_asm_constraints(void)
4584 asm_constraint_t *result = NULL;
4585 asm_constraint_t *last = NULL;
4587 while(token.type == T_STRING_LITERAL || token.type == '[') {
4588 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4589 memset(constraint, 0, sizeof(constraint[0]));
4591 if(token.type == '[') {
4593 if(token.type != T_IDENTIFIER) {
4594 parse_error_expected("while parsing asm constraint",
4598 constraint->symbol = token.v.symbol;
4603 constraint->constraints = parse_string_literals();
4605 constraint->expression = parse_expression();
4609 last->next = constraint;
4611 result = constraint;
4615 if(token.type != ',')
4623 static asm_clobber_t *parse_asm_clobbers(void)
4625 asm_clobber_t *result = NULL;
4626 asm_clobber_t *last = NULL;
4628 while(token.type == T_STRING_LITERAL) {
4629 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4630 clobber->clobber = parse_string_literals();
4633 last->next = clobber;
4639 if(token.type != ',')
4647 static statement_t *parse_asm_statement(void)
4651 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4652 statement->base.source_position = token.source_position;
4654 asm_statement_t *asm_statement = &statement->asms;
4656 if(token.type == T_volatile) {
4658 asm_statement->is_volatile = true;
4662 asm_statement->asm_text = parse_string_literals();
4664 if(token.type != ':')
4668 asm_statement->inputs = parse_asm_constraints();
4669 if(token.type != ':')
4673 asm_statement->outputs = parse_asm_constraints();
4674 if(token.type != ':')
4678 asm_statement->clobbers = parse_asm_clobbers();
4686 static statement_t *parse_case_statement(void)
4690 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4692 statement->base.source_position = token.source_position;
4693 statement->case_label.expression = parse_expression();
4696 statement->case_label.label_statement = parse_statement();
4701 static statement_t *parse_default_statement(void)
4705 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4707 statement->base.source_position = token.source_position;
4710 statement->label.label_statement = parse_statement();
4715 static declaration_t *get_label(symbol_t *symbol)
4717 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4718 assert(current_function != NULL);
4719 /* if we found a label in the same function, then we already created the
4721 if(candidate != NULL
4722 && candidate->parent_context == ¤t_function->context) {
4726 /* otherwise we need to create a new one */
4727 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
4728 declaration->namespc = NAMESPACE_LABEL;
4729 declaration->symbol = symbol;
4731 label_push(declaration);
4736 static statement_t *parse_label_statement(void)
4738 assert(token.type == T_IDENTIFIER);
4739 symbol_t *symbol = token.v.symbol;
4742 declaration_t *label = get_label(symbol);
4744 /* if source position is already set then the label is defined twice,
4745 * otherwise it was just mentioned in a goto so far */
4746 if(label->source_position.input_name != NULL) {
4747 parser_print_error_prefix();
4748 fprintf(stderr, "duplicate label '%s'\n", symbol->string);
4749 parser_print_error_prefix_pos(label->source_position);
4750 fprintf(stderr, "previous definition of '%s' was here\n",
4753 label->source_position = token.source_position;
4756 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
4758 label_statement->statement.kind = STATEMENT_LABEL;
4759 label_statement->statement.source_position = token.source_position;
4760 label_statement->label = label;
4764 if(token.type == '}') {
4765 parse_error("label at end of compound statement");
4766 return (statement_t*) label_statement;
4768 label_statement->label_statement = parse_statement();
4771 return (statement_t*) label_statement;
4774 static statement_t *parse_if(void)
4778 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4779 statement->statement.kind = STATEMENT_IF;
4780 statement->statement.source_position = token.source_position;
4783 statement->condition = parse_expression();
4786 statement->true_statement = parse_statement();
4787 if(token.type == T_else) {
4789 statement->false_statement = parse_statement();
4792 return (statement_t*) statement;
4795 static statement_t *parse_switch(void)
4799 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4800 statement->statement.kind = STATEMENT_SWITCH;
4801 statement->statement.source_position = token.source_position;
4804 statement->expression = parse_expression();
4806 statement->body = parse_statement();
4808 return (statement_t*) statement;
4811 static statement_t *parse_while(void)
4815 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4816 statement->statement.kind = STATEMENT_WHILE;
4817 statement->statement.source_position = token.source_position;
4820 statement->condition = parse_expression();
4822 statement->body = parse_statement();
4824 return (statement_t*) statement;
4827 static statement_t *parse_do(void)
4831 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4832 statement->statement.kind = STATEMENT_DO_WHILE;
4833 statement->statement.source_position = token.source_position;
4835 statement->body = parse_statement();
4838 statement->condition = parse_expression();
4842 return (statement_t*) statement;
4845 static statement_t *parse_for(void)
4849 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4850 statement->statement.kind = STATEMENT_FOR;
4851 statement->statement.source_position = token.source_position;
4855 int top = environment_top();
4856 context_t *last_context = context;
4857 set_context(&statement->context);
4859 if(token.type != ';') {
4860 if(is_declaration_specifier(&token, false)) {
4861 parse_declaration(record_declaration);
4863 statement->initialisation = parse_expression();
4870 if(token.type != ';') {
4871 statement->condition = parse_expression();
4874 if(token.type != ')') {
4875 statement->step = parse_expression();
4878 statement->body = parse_statement();
4880 assert(context == &statement->context);
4881 set_context(last_context);
4882 environment_pop_to(top);
4884 return (statement_t*) statement;
4887 static statement_t *parse_goto(void)
4891 if(token.type != T_IDENTIFIER) {
4892 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
4896 symbol_t *symbol = token.v.symbol;
4899 declaration_t *label = get_label(symbol);
4901 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4903 statement->statement.kind = STATEMENT_GOTO;
4904 statement->statement.source_position = token.source_position;
4906 statement->label = label;
4910 return (statement_t*) statement;
4913 static statement_t *parse_continue(void)
4918 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4919 statement->kind = STATEMENT_CONTINUE;
4920 statement->base.source_position = token.source_position;
4925 static statement_t *parse_break(void)
4930 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4931 statement->kind = STATEMENT_BREAK;
4932 statement->base.source_position = token.source_position;
4937 static statement_t *parse_return(void)
4941 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4943 statement->statement.kind = STATEMENT_RETURN;
4944 statement->statement.source_position = token.source_position;
4946 assert(is_type_function(current_function->type));
4947 function_type_t *function_type = ¤t_function->type->function;
4948 type_t *return_type = function_type->return_type;
4950 expression_t *return_value = NULL;
4951 if(token.type != ';') {
4952 return_value = parse_expression();
4956 if(return_type == NULL)
4957 return (statement_t*) statement;
4958 if(return_value != NULL && return_value->base.datatype == NULL)
4959 return (statement_t*) statement;
4961 return_type = skip_typeref(return_type);
4963 if(return_value != NULL) {
4964 type_t *return_value_type = skip_typeref(return_value->base.datatype);
4966 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
4967 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
4968 parse_warning("'return' with a value, in function returning void");
4969 return_value = NULL;
4971 if(return_type != NULL) {
4972 semantic_assign(return_type, &return_value, "'return'");
4976 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
4977 parse_warning("'return' without value, in function returning "
4981 statement->return_value = return_value;
4983 return (statement_t*) statement;
4986 static statement_t *parse_declaration_statement(void)
4988 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
4990 statement->base.source_position = token.source_position;
4992 declaration_t *before = last_declaration;
4993 parse_declaration(record_declaration);
4995 if(before == NULL) {
4996 statement->declaration.declarations_begin = context->declarations;
4998 statement->declaration.declarations_begin = before->next;
5000 statement->declaration.declarations_end = last_declaration;
5005 static statement_t *parse_expression_statement(void)
5007 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5009 statement->base.source_position = token.source_position;
5010 statement->expression.expression = parse_expression();
5017 static statement_t *parse_statement(void)
5019 statement_t *statement = NULL;
5021 /* declaration or statement */
5022 switch(token.type) {
5024 statement = parse_asm_statement();
5028 statement = parse_case_statement();
5032 statement = parse_default_statement();
5036 statement = parse_compound_statement();
5040 statement = parse_if();
5044 statement = parse_switch();
5048 statement = parse_while();
5052 statement = parse_do();
5056 statement = parse_for();
5060 statement = parse_goto();
5064 statement = parse_continue();
5068 statement = parse_break();
5072 statement = parse_return();
5081 if(look_ahead(1)->type == ':') {
5082 statement = parse_label_statement();
5086 if(is_typedef_symbol(token.v.symbol)) {
5087 statement = parse_declaration_statement();
5091 statement = parse_expression_statement();
5094 case T___extension__:
5095 /* this can be a prefix to a declaration or an expression statement */
5096 /* we simply eat it now and parse the rest with tail recursion */
5099 } while(token.type == T___extension__);
5100 statement = parse_statement();
5104 statement = parse_declaration_statement();
5108 statement = parse_expression_statement();
5112 assert(statement == NULL
5113 || statement->base.source_position.input_name != NULL);
5118 static statement_t *parse_compound_statement(void)
5120 compound_statement_t *compound_statement
5121 = allocate_ast_zero(sizeof(compound_statement[0]));
5122 compound_statement->statement.kind = STATEMENT_COMPOUND;
5123 compound_statement->statement.source_position = token.source_position;
5127 int top = environment_top();
5128 context_t *last_context = context;
5129 set_context(&compound_statement->context);
5131 statement_t *last_statement = NULL;
5133 while(token.type != '}' && token.type != T_EOF) {
5134 statement_t *statement = parse_statement();
5135 if(statement == NULL)
5138 if(last_statement != NULL) {
5139 last_statement->base.next = statement;
5141 compound_statement->statements = statement;
5144 while(statement->base.next != NULL)
5145 statement = statement->base.next;
5147 last_statement = statement;
5150 if(token.type != '}') {
5151 parser_print_error_prefix_pos(
5152 compound_statement->statement.source_position);
5153 fprintf(stderr, "end of file while looking for closing '}'\n");
5157 assert(context == &compound_statement->context);
5158 set_context(last_context);
5159 environment_pop_to(top);
5161 return (statement_t*) compound_statement;
5164 static void initialize_builtins(void)
5166 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5167 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5168 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5169 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5170 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5171 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5172 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5173 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5175 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5176 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5177 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5178 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5181 static translation_unit_t *parse_translation_unit(void)
5183 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5185 assert(global_context == NULL);
5186 global_context = &unit->context;
5188 assert(context == NULL);
5189 set_context(&unit->context);
5191 initialize_builtins();
5193 while(token.type != T_EOF) {
5194 parse_external_declaration();
5197 assert(context == &unit->context);
5199 last_declaration = NULL;
5201 assert(global_context == &unit->context);
5202 global_context = NULL;
5207 translation_unit_t *parse(void)
5209 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5210 label_stack = NEW_ARR_F(stack_entry_t, 0);
5211 found_error = false;
5213 type_set_output(stderr);
5214 ast_set_output(stderr);
5216 lookahead_bufpos = 0;
5217 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5220 translation_unit_t *unit = parse_translation_unit();
5222 DEL_ARR_F(environment_stack);
5223 DEL_ARR_F(label_stack);
5231 void init_parser(void)
5233 init_expression_parsers();
5234 obstack_init(&temp_obst);
5236 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5237 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5240 void exit_parser(void)
5242 obstack_free(&temp_obst, NULL);