11 #include "type_hash.h"
13 #include "adt/bitfiddle.h"
14 #include "adt/error.h"
15 #include "adt/array.h"
17 //#define PRINT_TOKENS
18 //#define ABORT_ON_ERROR
19 #define MAX_LOOKAHEAD 2
23 declaration_t *old_declaration;
25 unsigned short namespace;
29 static token_t lookahead_buffer[MAX_LOOKAHEAD];
30 static int lookahead_bufpos;
31 static stack_entry_t *environment_stack = NULL;
32 static stack_entry_t *label_stack = NULL;
33 static context_t *global_context = NULL;
34 static context_t *context = NULL;
35 static declaration_t *last_declaration = NULL;
36 static declaration_t *current_function = NULL;
37 static struct obstack temp_obst;
38 static bool found_error;
40 static type_t *type_int = NULL;
41 static type_t *type_uint = NULL;
42 static type_t *type_long_double = NULL;
43 static type_t *type_double = NULL;
44 static type_t *type_float = NULL;
45 static type_t *type_const_char = NULL;
46 static type_t *type_string = NULL;
47 static type_t *type_void = NULL;
48 static type_t *type_size_t = NULL;
49 static type_t *type_ptrdiff_t = NULL;
51 static statement_t *parse_compound_statement(void);
52 static statement_t *parse_statement(void);
54 static expression_t *parse_sub_expression(unsigned precedence);
55 static expression_t *parse_expression(void);
56 static type_t *parse_typename(void);
58 #define STORAGE_CLASSES \
65 #define TYPE_QUALIFIERS \
71 #ifdef PROVIDE_COMPLEX
72 #define COMPLEX_SPECIFIERS \
75 #define COMPLEX_SPECIFIERS
78 #ifdef PROVIDE_IMAGINARY
79 #define IMAGINARY_SPECIFIERS \
82 #define IMAGINARY_SPECIFIERS
85 #define TYPE_SPECIFIERS \
103 #define DECLARATION_START \
108 #define TYPENAME_START \
112 static inline void *allocate_ast_zero(size_t size)
114 void *res = allocate_ast(size);
115 memset(res, 0, size);
119 static inline void *allocate_type_zero(size_t size)
121 void *res = obstack_alloc(type_obst, size);
122 memset(res, 0, size);
126 static inline void free_type(void *type)
128 obstack_free(type_obst, type);
132 * returns the top element of the environment stack
134 static inline size_t environment_top(void)
136 return ARR_LEN(environment_stack);
139 static inline size_t label_top(void)
141 return ARR_LEN(label_stack);
146 static inline void next_token(void)
148 token = lookahead_buffer[lookahead_bufpos];
149 lookahead_buffer[lookahead_bufpos] = lexer_token;
152 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
155 print_token(stderr, &token);
156 fprintf(stderr, "\n");
160 static inline const token_t *look_ahead(int num)
162 assert(num > 0 && num <= MAX_LOOKAHEAD);
163 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
164 return & lookahead_buffer[pos];
167 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
169 static void error(void)
172 #ifdef ABORT_ON_ERROR
177 static void parser_print_prefix_pos(const source_position_t source_position)
179 fputs(source_position.input_name, stderr);
181 fprintf(stderr, "%d", source_position.linenr);
185 static void parser_print_error_prefix_pos(
186 const source_position_t source_position)
188 parser_print_prefix_pos(source_position);
189 fputs("error: ", stderr);
193 static void parser_print_error_prefix(void)
195 parser_print_error_prefix_pos(token.source_position);
198 static void parse_error(const char *message)
200 parser_print_error_prefix();
201 fprintf(stderr, "parse error: %s\n", message);
204 static void parser_print_warning_prefix_pos(
205 const source_position_t source_position)
207 parser_print_prefix_pos(source_position);
208 fputs("warning: ", stderr);
211 static void parse_warning_pos(const source_position_t source_position,
212 const char *const message)
214 parser_print_prefix_pos(source_position);
215 fprintf(stderr, "warning: %s\n", message);
218 static void parse_warning(const char *message)
220 parse_warning_pos(token.source_position, message);
223 static void parse_error_expected(const char *message, ...)
228 if(message != NULL) {
229 parser_print_error_prefix();
230 fprintf(stderr, "%s\n", message);
232 parser_print_error_prefix();
233 fputs("Parse error: got ", stderr);
234 print_token(stderr, &token);
235 fputs(", expected ", stderr);
237 va_start(args, message);
238 token_type_t token_type = va_arg(args, token_type_t);
239 while(token_type != 0) {
243 fprintf(stderr, ", ");
245 print_token_type(stderr, token_type);
246 token_type = va_arg(args, token_type_t);
249 fprintf(stderr, "\n");
252 static void print_type_quoted(type_t *type)
259 static void type_error(const char *msg, const source_position_t source_position,
262 parser_print_error_prefix_pos(source_position);
263 fprintf(stderr, "%s, but found type ", msg);
264 print_type_quoted(type);
268 static void type_error_incompatible(const char *msg,
269 const source_position_t source_position, type_t *type1, type_t *type2)
271 parser_print_error_prefix_pos(source_position);
272 fprintf(stderr, "%s, incompatible types: ", msg);
273 print_type_quoted(type1);
274 fprintf(stderr, " - ");
275 print_type_quoted(type2);
276 fprintf(stderr, ")\n");
279 static void eat_block(void)
281 if(token.type == '{')
284 while(token.type != '}') {
285 if(token.type == T_EOF)
287 if(token.type == '{') {
296 static void eat_statement(void)
298 while(token.type != ';') {
299 if(token.type == T_EOF)
301 if(token.type == '}')
303 if(token.type == '{') {
312 static void eat_brace(void)
314 if(token.type == '(')
317 while(token.type != ')') {
318 if(token.type == T_EOF)
320 if(token.type == ')' || token.type == ';' || token.type == '}') {
323 if(token.type == '(') {
327 if(token.type == '{') {
336 #define expect(expected) \
337 if(UNLIKELY(token.type != (expected))) { \
338 parse_error_expected(NULL, (expected), 0); \
344 #define expect_void(expected) \
345 if(UNLIKELY(token.type != (expected))) { \
346 parse_error_expected(NULL, (expected), 0); \
352 static void set_context(context_t *new_context)
354 context = new_context;
356 last_declaration = new_context->declarations;
357 if(last_declaration != NULL) {
358 while(last_declaration->next != NULL) {
359 last_declaration = last_declaration->next;
365 * called when we find a 2nd declarator for an identifier we already have a
368 static bool is_compatible_declaration (declaration_t *declaration,
369 declaration_t *previous)
371 /* TODO: not correct yet */
372 return declaration->type == previous->type;
375 static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespace)
377 declaration_t *declaration = symbol->declaration;
378 for( ; declaration != NULL; declaration = declaration->symbol_next) {
379 if(declaration->namespace == namespace)
386 static const char *get_namespace_prefix(namespace_t namespace)
389 case NAMESPACE_NORMAL:
391 case NAMESPACE_UNION:
393 case NAMESPACE_STRUCT:
397 case NAMESPACE_LABEL:
400 panic("invalid namespace found");
404 * pushs an environment_entry on the environment stack and links the
405 * corresponding symbol to the new entry
407 static declaration_t *stack_push(stack_entry_t **stack_ptr,
408 declaration_t *declaration,
409 context_t *parent_context)
411 symbol_t *symbol = declaration->symbol;
412 namespace_t namespace = (namespace_t)declaration->namespace;
414 /* a declaration should be only pushed once */
415 assert(declaration->parent_context == NULL);
416 declaration->parent_context = parent_context;
418 declaration_t *previous_declaration = get_declaration(symbol, namespace);
419 assert(declaration != previous_declaration);
420 if(previous_declaration != NULL
421 && previous_declaration->parent_context == context) {
422 if(!is_compatible_declaration(declaration, previous_declaration)) {
423 parser_print_error_prefix_pos(declaration->source_position);
424 fprintf(stderr, "definition of symbol %s%s with type ",
425 get_namespace_prefix(namespace), symbol->string);
426 print_type_quoted(declaration->type);
428 parser_print_error_prefix_pos(
429 previous_declaration->source_position);
430 fprintf(stderr, "is incompatible with previous declaration "
432 print_type_quoted(previous_declaration->type);
435 const storage_class_t old_storage = previous_declaration->storage_class;
436 const storage_class_t new_storage = declaration->storage_class;
437 if (current_function == NULL) {
438 if (old_storage != STORAGE_CLASS_STATIC &&
439 new_storage == STORAGE_CLASS_STATIC) {
440 parser_print_error_prefix_pos(declaration->source_position);
442 "static declaration of '%s' follows non-static declaration\n",
444 parser_print_error_prefix_pos(previous_declaration->source_position);
445 fprintf(stderr, "previous declaration of '%s' was here\n",
448 if (old_storage == STORAGE_CLASS_EXTERN) {
449 if (new_storage == STORAGE_CLASS_NONE) {
450 previous_declaration->storage_class = STORAGE_CLASS_NONE;
453 parser_print_warning_prefix_pos(declaration->source_position);
454 fprintf(stderr, "redundant declaration for '%s'\n",
456 parser_print_warning_prefix_pos(previous_declaration->source_position);
457 fprintf(stderr, "previous declaration of '%s' was here\n",
462 if (old_storage == STORAGE_CLASS_EXTERN &&
463 new_storage == STORAGE_CLASS_EXTERN) {
464 parser_print_warning_prefix_pos(declaration->source_position);
465 fprintf(stderr, "redundant extern declaration for '%s'\n",
467 parser_print_warning_prefix_pos(previous_declaration->source_position);
468 fprintf(stderr, "previous declaration of '%s' was here\n",
471 parser_print_error_prefix_pos(declaration->source_position);
472 if (old_storage == new_storage) {
473 fprintf(stderr, "redeclaration of '%s'\n", symbol->string);
475 fprintf(stderr, "redeclaration of '%s' with different linkage\n", symbol->string);
477 parser_print_error_prefix_pos(previous_declaration->source_position);
478 fprintf(stderr, "previous declaration of '%s' was here\n",
483 return previous_declaration;
486 /* remember old declaration */
488 entry.symbol = symbol;
489 entry.old_declaration = symbol->declaration;
490 entry.namespace = namespace;
491 ARR_APP1(stack_entry_t, *stack_ptr, entry);
493 /* replace/add declaration into declaration list of the symbol */
494 if(symbol->declaration == NULL) {
495 symbol->declaration = declaration;
497 declaration_t *iter_last = NULL;
498 declaration_t *iter = symbol->declaration;
499 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
500 /* replace an entry? */
501 if(iter->namespace == namespace) {
502 if(iter_last == NULL) {
503 symbol->declaration = declaration;
505 iter_last->symbol_next = declaration;
507 declaration->symbol_next = iter->symbol_next;
512 assert(iter_last->symbol_next == NULL);
513 iter_last->symbol_next = declaration;
520 static declaration_t *environment_push(declaration_t *declaration)
522 assert(declaration->source_position.input_name != NULL);
523 return stack_push(&environment_stack, declaration, context);
526 static declaration_t *label_push(declaration_t *declaration)
528 return stack_push(&label_stack, declaration, ¤t_function->context);
532 * pops symbols from the environment stack until @p new_top is the top element
534 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
536 stack_entry_t *stack = *stack_ptr;
537 size_t top = ARR_LEN(stack);
540 assert(new_top <= top);
544 for(i = top; i > new_top; --i) {
545 stack_entry_t *entry = & stack[i - 1];
547 declaration_t *old_declaration = entry->old_declaration;
548 symbol_t *symbol = entry->symbol;
549 namespace_t namespace = (namespace_t)entry->namespace;
551 /* replace/remove declaration */
552 declaration_t *declaration = symbol->declaration;
553 assert(declaration != NULL);
554 if(declaration->namespace == namespace) {
555 if(old_declaration == NULL) {
556 symbol->declaration = declaration->symbol_next;
558 symbol->declaration = old_declaration;
561 declaration_t *iter_last = declaration;
562 declaration_t *iter = declaration->symbol_next;
563 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
564 /* replace an entry? */
565 if(iter->namespace == namespace) {
566 assert(iter_last != NULL);
567 iter_last->symbol_next = old_declaration;
568 old_declaration->symbol_next = iter->symbol_next;
572 assert(iter != NULL);
576 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
579 static void environment_pop_to(size_t new_top)
581 stack_pop_to(&environment_stack, new_top);
584 static void label_pop_to(size_t new_top)
586 stack_pop_to(&label_stack, new_top);
590 static int get_rank(const type_t *type)
592 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
593 * and esp. footnote 108). However we can't fold constants (yet), so we
594 * can't decide wether unsigned int is possible, while int always works.
595 * (unsigned int would be preferable when possible... for stuff like
596 * struct { enum { ... } bla : 4; } ) */
597 if(type->type == TYPE_ENUM)
598 return ATOMIC_TYPE_INT;
600 assert(type->type == TYPE_ATOMIC);
601 atomic_type_t *atomic_type = (atomic_type_t*) type;
602 atomic_type_type_t atype = atomic_type->atype;
606 static type_t *promote_integer(type_t *type)
608 if(get_rank(type) < ATOMIC_TYPE_INT)
614 static expression_t *create_cast_expression(expression_t *expression,
617 unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
619 cast->expression.type = EXPR_UNARY;
620 cast->type = UNEXPR_CAST;
621 cast->value = expression;
622 cast->expression.datatype = dest_type;
624 return (expression_t*) cast;
627 static bool is_null_expression(const expression_t *const expr)
629 if (expr->type != EXPR_CONST) return false;
631 type_t *const type = skip_typeref(expr->datatype);
632 if (!is_type_integer(type)) return false;
634 const const_t *const const_expr = (const const_t*)expr;
635 return const_expr->v.int_value == 0;
638 static expression_t *create_implicit_cast(expression_t *expression,
641 type_t *source_type = expression->datatype;
643 if(source_type == NULL)
646 source_type = skip_typeref(source_type);
647 dest_type = skip_typeref(dest_type);
649 if(source_type == dest_type)
652 if(dest_type->type == TYPE_ATOMIC) {
653 if(source_type->type != TYPE_ATOMIC)
654 panic("casting of non-atomic types not implemented yet");
656 if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
657 type_error_incompatible("can't cast types",
658 expression->source_position,
659 source_type, dest_type);
663 return create_cast_expression(expression, dest_type);
665 if(dest_type->type == TYPE_POINTER) {
666 pointer_type_t *pointer_type
667 = (pointer_type_t*) dest_type;
668 switch (source_type->type) {
670 if (is_null_expression(expression)) {
671 return create_cast_expression(expression, dest_type);
676 if (pointers_compatible(source_type, dest_type)) {
677 return create_cast_expression(expression, dest_type);
682 array_type_t *const array_type = (array_type_t*) source_type;
683 if (types_compatible(array_type->element_type,
684 pointer_type->points_to)) {
685 return create_cast_expression(expression, dest_type);
691 panic("casting of non-atomic types not implemented yet");
694 type_error_incompatible("can't implicitely cast types",
695 expression->source_position,
696 source_type, dest_type);
700 panic("casting of non-atomic types not implemented yet");
703 static void semantic_assign(type_t *orig_type_left, expression_t **right,
706 type_t *orig_type_right = (*right)->datatype;
708 if(orig_type_right == NULL)
711 type_t *const type_left = skip_typeref(orig_type_left);
712 type_t *const type_right = skip_typeref(orig_type_right);
714 if (type_left == type_right) {
718 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
719 (type_left->type == TYPE_POINTER && is_null_expression(*right)) ||
720 (type_left->type == TYPE_POINTER && type_right->type == TYPE_POINTER)) {
721 *right = create_implicit_cast(*right, type_left);
725 if (type_left->type == TYPE_POINTER && type_right->type == TYPE_FUNCTION) {
726 pointer_type_t *const ptr_type = (pointer_type_t*)type_left;
727 if (ptr_type->points_to == type_right) {
732 /* TODO: improve error message */
733 parser_print_error_prefix();
734 fprintf(stderr, "incompatible types in %s\n", context);
735 parser_print_error_prefix();
736 print_type_quoted(type_left);
737 fputs(" <- ", stderr);
738 print_type_quoted(type_right);
742 static expression_t *parse_constant_expression(void)
744 /* start parsing at precedence 7 (conditional expression) */
745 return parse_sub_expression(7);
748 static expression_t *parse_assignment_expression(void)
750 /* start parsing at precedence 2 (assignment expression) */
751 return parse_sub_expression(2);
754 typedef struct declaration_specifiers_t declaration_specifiers_t;
755 struct declaration_specifiers_t {
756 storage_class_t storage_class;
761 static void parse_compound_type_entries(void);
762 static declaration_t *parse_declarator(
763 const declaration_specifiers_t *specifiers, type_t *type,
764 bool may_be_abstract);
765 static declaration_t *record_declaration(declaration_t *declaration);
767 static const char *parse_string_literals(void)
769 assert(token.type == T_STRING_LITERAL);
770 const char *result = token.v.string;
774 while(token.type == T_STRING_LITERAL) {
775 result = concat_strings(result, token.v.string);
782 static void parse_attributes(void)
786 case T___attribute__:
794 parse_error("EOF while parsing attribute");
812 if(token.type != T_STRING_LITERAL) {
813 parse_error_expected("while parsing assembler attribute",
818 parse_string_literals();
823 goto attributes_finished;
831 static designator_t *parse_designation(void)
833 if(token.type != '[' && token.type != '.')
836 designator_t *result = NULL;
837 designator_t *last = NULL;
840 designator_t *designator;
843 designator = allocate_ast_zero(sizeof(designator[0]));
845 designator->array_access = parse_constant_expression();
849 designator = allocate_ast_zero(sizeof(designator[0]));
851 if(token.type != T_IDENTIFIER) {
852 parse_error_expected("while parsing designator",
856 designator->symbol = token.v.symbol;
864 assert(designator != NULL);
866 last->next = designator;
874 static initializer_t *parse_initializer_list(type_t *type);
876 static initializer_t *parse_initializer(type_t *type)
878 designator_t *designator = parse_designation();
880 initializer_t *result;
881 if(token.type == '{') {
882 result = parse_initializer_list(type);
884 result = allocate_ast_zero(sizeof(result[0]));
885 result->type = INITIALIZER_VALUE;
886 result->v.value = parse_assignment_expression();
889 semantic_assign(type, &result->v.value, "initializer");
892 result->designator = designator;
897 static initializer_t *parse_initializer_list(type_t *type)
904 initializer_t *result = allocate_ast_zero(sizeof(result[0]));
905 result->type = INITIALIZER_LIST;
907 initializer_t *last = NULL;
909 initializer_t *initializer = parse_initializer(NULL);
911 last->next = initializer;
913 result->v.list = initializer;
917 if(token.type == '}')
920 if(token.type != ',') {
921 parse_error_expected("while parsing initializer list", ',', '}', 0);
927 if(token.type == '}')
936 static declaration_t *parse_compound_type_specifier(bool is_struct)
944 symbol_t *symbol = NULL;
945 declaration_t *declaration = NULL;
947 if(token.type == T_IDENTIFIER) {
948 symbol = token.v.symbol;
952 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
954 declaration = get_declaration(symbol, NAMESPACE_UNION);
956 } else if(token.type != '{') {
958 parse_error_expected("while parsing struct type specifier",
959 T_IDENTIFIER, '{', 0);
961 parse_error_expected("while parsing union type specifier",
962 T_IDENTIFIER, '{', 0);
968 if(declaration == NULL) {
969 declaration = allocate_type_zero(sizeof(declaration[0]));
972 declaration->namespace = NAMESPACE_STRUCT;
974 declaration->namespace = NAMESPACE_UNION;
976 declaration->source_position = token.source_position;
977 declaration->symbol = symbol;
978 record_declaration(declaration);
981 if(token.type == '{') {
982 if(declaration->init.is_defined) {
983 assert(symbol != NULL);
984 parser_print_error_prefix();
985 fprintf(stderr, "multiple definition of %s %s\n",
986 is_struct ? "struct" : "union", symbol->string);
987 declaration->context.declarations = NULL;
989 declaration->init.is_defined = true;
991 int top = environment_top();
992 context_t *last_context = context;
993 set_context(& declaration->context);
995 parse_compound_type_entries();
998 assert(context == & declaration->context);
999 set_context(last_context);
1000 environment_pop_to(top);
1006 static void parse_enum_entries(void)
1010 if(token.type == '}') {
1012 parse_error("empty enum not allowed");
1017 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
1019 if(token.type != T_IDENTIFIER) {
1020 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1024 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1025 entry->symbol = token.v.symbol;
1026 entry->source_position = token.source_position;
1029 if(token.type == '=') {
1031 entry->init.initializer = parse_initializer(type_int);
1034 record_declaration(entry);
1036 if(token.type != ',')
1039 } while(token.type != '}');
1044 static declaration_t *parse_enum_specifier(void)
1048 declaration_t *declaration;
1051 if(token.type == T_IDENTIFIER) {
1052 symbol = token.v.symbol;
1055 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1056 } else if(token.type != '{') {
1057 parse_error_expected("while parsing enum type specifier",
1058 T_IDENTIFIER, '{', 0);
1065 if(declaration == NULL) {
1066 declaration = allocate_type_zero(sizeof(declaration[0]));
1068 declaration->namespace = NAMESPACE_ENUM;
1069 declaration->source_position = token.source_position;
1070 declaration->symbol = symbol;
1073 if(token.type == '{') {
1074 if(declaration->init.is_defined) {
1075 parser_print_error_prefix();
1076 fprintf(stderr, "multiple definitions of enum %s\n",
1079 record_declaration(declaration);
1080 declaration->init.is_defined = 1;
1082 parse_enum_entries();
1090 * if a symbol is a typedef to another type, return true
1092 static bool is_typedef_symbol(symbol_t *symbol)
1094 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1095 if(declaration == NULL
1096 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1102 static type_t *parse_typeof(void)
1110 expression_t *expression = NULL;
1113 switch(token.type) {
1114 case T___extension__:
1115 /* this can be a prefix to a typename or an expression */
1116 /* we simply eat it now. */
1119 } while(token.type == T___extension__);
1123 if(is_typedef_symbol(token.v.symbol)) {
1124 type = parse_typename();
1126 expression = parse_expression();
1127 type = expression->datatype;
1132 type = parse_typename();
1136 expression = parse_expression();
1137 type = expression->datatype;
1143 typeof_type_t *typeof = allocate_type_zero(sizeof(typeof[0]));
1144 typeof->type.type = TYPE_TYPEOF;
1145 typeof->expression = expression;
1146 typeof->typeof_type = type;
1148 return (type_t*) typeof;
1152 SPECIFIER_SIGNED = 1 << 0,
1153 SPECIFIER_UNSIGNED = 1 << 1,
1154 SPECIFIER_LONG = 1 << 2,
1155 SPECIFIER_INT = 1 << 3,
1156 SPECIFIER_DOUBLE = 1 << 4,
1157 SPECIFIER_CHAR = 1 << 5,
1158 SPECIFIER_SHORT = 1 << 6,
1159 SPECIFIER_LONG_LONG = 1 << 7,
1160 SPECIFIER_FLOAT = 1 << 8,
1161 SPECIFIER_BOOL = 1 << 9,
1162 SPECIFIER_VOID = 1 << 10,
1163 #ifdef PROVIDE_COMPLEX
1164 SPECIFIER_COMPLEX = 1 << 11,
1166 #ifdef PROVIDE_IMAGINARY
1167 SPECIFIER_IMAGINARY = 1 << 12,
1171 static type_t *create_builtin_type(symbol_t *symbol)
1173 builtin_type_t *type = allocate_type_zero(sizeof(type[0]));
1174 type->type.type = TYPE_BUILTIN;
1175 type->symbol = symbol;
1177 type->real_type = type_int;
1179 return (type_t*) type;
1182 static type_t *get_typedef_type(symbol_t *symbol)
1184 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1185 if(declaration == NULL
1186 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1189 typedef_type_t *typedef_type = allocate_type_zero(sizeof(typedef_type[0]));
1190 typedef_type->type.type = TYPE_TYPEDEF;
1191 typedef_type->declaration = declaration;
1193 return (type_t*) typedef_type;
1196 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1198 type_t *type = NULL;
1199 unsigned type_qualifiers = 0;
1200 unsigned type_specifiers = 0;
1204 switch(token.type) {
1207 #define MATCH_STORAGE_CLASS(token, class) \
1209 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1210 parse_error("multiple storage classes in declaration " \
1213 specifiers->storage_class = class; \
1217 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1218 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1219 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1220 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1221 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1223 /* type qualifiers */
1224 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1226 type_qualifiers |= qualifier; \
1230 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1231 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1232 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1234 case T___extension__:
1239 /* type specifiers */
1240 #define MATCH_SPECIFIER(token, specifier, name) \
1243 if(type_specifiers & specifier) { \
1244 parse_error("multiple " name " type specifiers given"); \
1246 type_specifiers |= specifier; \
1250 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1251 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1252 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1253 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1254 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1255 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1256 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1257 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1258 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1259 #ifdef PROVIDE_COMPLEX
1260 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1262 #ifdef PROVIDE_IMAGINARY
1263 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1267 specifiers->is_inline = true;
1272 if(type_specifiers & SPECIFIER_LONG_LONG) {
1273 parse_error("multiple type specifiers given");
1274 } else if(type_specifiers & SPECIFIER_LONG) {
1275 type_specifiers |= SPECIFIER_LONG_LONG;
1277 type_specifiers |= SPECIFIER_LONG;
1281 /* TODO: if type != NULL for the following rules should issue
1284 compound_type_t *compound_type
1285 = allocate_type_zero(sizeof(compound_type[0]));
1286 compound_type->type.type = TYPE_COMPOUND_STRUCT;
1287 compound_type->declaration = parse_compound_type_specifier(true);
1289 type = (type_t*) compound_type;
1293 compound_type_t *compound_type
1294 = allocate_type_zero(sizeof(compound_type[0]));
1295 compound_type->type.type = TYPE_COMPOUND_UNION;
1296 compound_type->declaration = parse_compound_type_specifier(false);
1298 type = (type_t*) compound_type;
1302 enum_type_t *enum_type = allocate_type_zero(sizeof(enum_type[0]));
1303 enum_type->type.type = TYPE_ENUM;
1304 enum_type->declaration = parse_enum_specifier();
1306 type = (type_t*) enum_type;
1310 type = parse_typeof();
1312 case T___builtin_va_list:
1313 type = create_builtin_type(token.v.symbol);
1317 case T___attribute__:
1322 case T_IDENTIFIER: {
1323 type_t *typedef_type = get_typedef_type(token.v.symbol);
1325 if(typedef_type == NULL)
1326 goto finish_specifiers;
1329 type = typedef_type;
1333 /* function specifier */
1335 goto finish_specifiers;
1342 atomic_type_type_t atomic_type;
1344 /* match valid basic types */
1345 switch(type_specifiers) {
1346 case SPECIFIER_VOID:
1347 atomic_type = ATOMIC_TYPE_VOID;
1349 case SPECIFIER_CHAR:
1350 atomic_type = ATOMIC_TYPE_CHAR;
1352 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1353 atomic_type = ATOMIC_TYPE_SCHAR;
1355 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1356 atomic_type = ATOMIC_TYPE_UCHAR;
1358 case SPECIFIER_SHORT:
1359 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1360 case SPECIFIER_SHORT | SPECIFIER_INT:
1361 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1362 atomic_type = ATOMIC_TYPE_SHORT;
1364 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1365 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1366 atomic_type = ATOMIC_TYPE_USHORT;
1369 case SPECIFIER_SIGNED:
1370 case SPECIFIER_SIGNED | SPECIFIER_INT:
1371 atomic_type = ATOMIC_TYPE_INT;
1373 case SPECIFIER_UNSIGNED:
1374 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1375 atomic_type = ATOMIC_TYPE_UINT;
1377 case SPECIFIER_LONG:
1378 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1379 case SPECIFIER_LONG | SPECIFIER_INT:
1380 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1381 atomic_type = ATOMIC_TYPE_LONG;
1383 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1384 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1385 atomic_type = ATOMIC_TYPE_ULONG;
1387 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1388 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1389 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1390 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1392 atomic_type = ATOMIC_TYPE_LONGLONG;
1394 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1395 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1397 atomic_type = ATOMIC_TYPE_ULONGLONG;
1399 case SPECIFIER_FLOAT:
1400 atomic_type = ATOMIC_TYPE_FLOAT;
1402 case SPECIFIER_DOUBLE:
1403 atomic_type = ATOMIC_TYPE_DOUBLE;
1405 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1406 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1408 case SPECIFIER_BOOL:
1409 atomic_type = ATOMIC_TYPE_BOOL;
1411 #ifdef PROVIDE_COMPLEX
1412 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1413 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1415 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1416 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1418 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1419 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1422 #ifdef PROVIDE_IMAGINARY
1423 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1424 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1426 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1427 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1429 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1430 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1434 /* invalid specifier combination, give an error message */
1435 if(type_specifiers == 0) {
1437 parse_warning("no type specifiers in declaration (using int)");
1438 atomic_type = ATOMIC_TYPE_INT;
1441 parse_error("no type specifiers given in declaration");
1443 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1444 (type_specifiers & SPECIFIER_UNSIGNED)) {
1445 parse_error("signed and unsigned specifiers gives");
1446 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1447 parse_error("only integer types can be signed or unsigned");
1449 parse_error("multiple datatypes in declaration");
1451 atomic_type = ATOMIC_TYPE_INVALID;
1454 atomic_type_t *atype = allocate_type_zero(sizeof(atype[0]));
1455 atype->type.type = TYPE_ATOMIC;
1456 atype->atype = atomic_type;
1459 type = (type_t*) atype;
1461 if(type_specifiers != 0) {
1462 parse_error("multiple datatypes in declaration");
1466 type->qualifiers = (type_qualifier_t)type_qualifiers;
1468 type_t *result = typehash_insert(type);
1469 if(newtype && result != (type_t*) type) {
1473 specifiers->type = result;
1476 static unsigned parse_type_qualifiers(void)
1478 unsigned type_qualifiers = TYPE_QUALIFIER_NONE;
1481 switch(token.type) {
1482 /* type qualifiers */
1483 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1484 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1485 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1488 return type_qualifiers;
1493 static void parse_identifier_list(void)
1496 if(token.type != T_IDENTIFIER) {
1497 parse_error_expected("while parsing parameter identifier list",
1502 if(token.type != ',')
1508 static declaration_t *parse_parameter(void)
1510 declaration_specifiers_t specifiers;
1511 memset(&specifiers, 0, sizeof(specifiers));
1513 parse_declaration_specifiers(&specifiers);
1515 declaration_t *declaration
1516 = parse_declarator(&specifiers, specifiers.type, true);
1518 /* TODO check declaration constraints for parameters */
1519 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1520 parse_error("typedef not allowed in parameter list");
1526 static declaration_t *parse_parameters(function_type_t *type)
1528 if(token.type == T_IDENTIFIER) {
1529 symbol_t *symbol = token.v.symbol;
1530 if(!is_typedef_symbol(symbol)) {
1532 parse_identifier_list();
1537 if(token.type == ')') {
1538 type->unspecified_parameters = 1;
1541 if(token.type == T_void && look_ahead(1)->type == ')') {
1546 declaration_t *declarations = NULL;
1547 declaration_t *declaration;
1548 declaration_t *last_declaration = NULL;
1549 function_parameter_t *parameter;
1550 function_parameter_t *last_parameter = NULL;
1553 switch(token.type) {
1557 return declarations;
1560 case T___extension__:
1562 declaration = parse_parameter();
1564 parameter = allocate_type_zero(sizeof(parameter[0]));
1565 parameter->type = declaration->type;
1567 if(last_parameter != NULL) {
1568 last_declaration->next = declaration;
1569 last_parameter->next = parameter;
1571 type->parameters = parameter;
1572 declarations = declaration;
1574 last_parameter = parameter;
1575 last_declaration = declaration;
1579 return declarations;
1581 if(token.type != ',')
1582 return declarations;
1592 } construct_type_type_t;
1594 typedef struct construct_type_t construct_type_t;
1595 struct construct_type_t {
1596 construct_type_type_t type;
1597 construct_type_t *next;
1600 typedef struct parsed_pointer_t parsed_pointer_t;
1601 struct parsed_pointer_t {
1602 construct_type_t construct_type;
1603 type_qualifier_t type_qualifiers;
1606 typedef struct construct_function_type_t construct_function_type_t;
1607 struct construct_function_type_t {
1608 construct_type_t construct_type;
1609 function_type_t *function_type;
1612 typedef struct parsed_array_t parsed_array_t;
1613 struct parsed_array_t {
1614 construct_type_t construct_type;
1615 type_qualifier_t type_qualifiers;
1621 typedef struct construct_base_type_t construct_base_type_t;
1622 struct construct_base_type_t {
1623 construct_type_t construct_type;
1627 static construct_type_t *parse_pointer_declarator(void)
1631 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
1632 memset(pointer, 0, sizeof(pointer[0]));
1633 pointer->construct_type.type = CONSTRUCT_POINTER;
1634 pointer->type_qualifiers = parse_type_qualifiers();
1636 return (construct_type_t*) pointer;
1639 static construct_type_t *parse_array_declarator(void)
1643 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
1644 memset(array, 0, sizeof(array[0]));
1645 array->construct_type.type = CONSTRUCT_ARRAY;
1647 if(token.type == T_static) {
1648 array->is_static = true;
1652 type_qualifier_t type_qualifiers = parse_type_qualifiers();
1653 if(type_qualifiers != 0) {
1654 if(token.type == T_static) {
1655 array->is_static = true;
1659 array->type_qualifiers = type_qualifiers;
1661 if(token.type == '*' && look_ahead(1)->type == ']') {
1662 array->is_variable = true;
1664 } else if(token.type != ']') {
1665 array->size = parse_assignment_expression();
1670 return (construct_type_t*) array;
1673 static construct_type_t *parse_function_declarator(declaration_t *declaration)
1677 function_type_t *type = allocate_type_zero(sizeof(type[0]));
1678 type->type.type = TYPE_FUNCTION;
1680 declaration_t *parameters = parse_parameters(type);
1681 if(declaration != NULL) {
1682 declaration->context.declarations = parameters;
1685 construct_function_type_t *construct_function_type =
1686 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
1687 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
1688 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
1689 construct_function_type->function_type = type;
1693 return (construct_type_t*) construct_function_type;
1696 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
1697 int may_be_abstract)
1699 construct_type_t *result = NULL;
1700 construct_type_t *last = NULL;
1702 while(token.type == '*') {
1703 construct_type_t *type = parse_pointer_declarator();
1712 /* TODO: find out if this is correct */
1715 construct_type_t *inner_types = NULL;
1717 switch(token.type) {
1719 if(declaration == NULL) {
1720 parse_error("no identifier expected in typename");
1722 declaration->symbol = token.v.symbol;
1723 declaration->source_position = token.source_position;
1729 inner_types = parse_inner_declarator(declaration, may_be_abstract);
1735 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
1739 construct_type_t *type;
1740 switch(token.type) {
1742 type = parse_function_declarator(declaration);
1745 type = parse_array_declarator();
1748 goto declarator_finished;
1759 declarator_finished:
1762 if(inner_types != NULL) {
1764 last->next = inner_types;
1766 result = inner_types;
1774 static type_t *construct_declarator_type(construct_type_t *construct_list,
1777 construct_type_t *iter = construct_list;
1778 for( ; iter != NULL; iter = iter->next) {
1779 parsed_pointer_t *parsed_pointer;
1780 parsed_array_t *parsed_array;
1781 construct_function_type_t *construct_function_type;
1782 function_type_t *function_type;
1783 pointer_type_t *pointer_type;
1784 array_type_t *array_type;
1786 switch(iter->type) {
1787 case CONSTRUCT_INVALID:
1788 panic("invalid type construction found");
1789 case CONSTRUCT_FUNCTION:
1790 construct_function_type = (construct_function_type_t*) iter;
1791 function_type = construct_function_type->function_type;
1793 function_type->result_type = type;
1794 type = (type_t*) function_type;
1797 case CONSTRUCT_POINTER:
1798 parsed_pointer = (parsed_pointer_t*) iter;
1799 pointer_type = allocate_type_zero(sizeof(pointer_type[0]));
1801 pointer_type->type.type = TYPE_POINTER;
1802 pointer_type->points_to = type;
1803 pointer_type->type.qualifiers = parsed_pointer->type_qualifiers;
1804 type = (type_t*) pointer_type;
1807 case CONSTRUCT_ARRAY:
1808 parsed_array = (parsed_array_t*) iter;
1809 array_type = allocate_type_zero(sizeof(array_type[0]));
1811 array_type->type.type = TYPE_ARRAY;
1812 array_type->element_type = type;
1813 array_type->type.qualifiers = parsed_array->type_qualifiers;
1814 array_type->is_static = parsed_array->is_static;
1815 array_type->is_variable = parsed_array->is_variable;
1816 array_type->size = parsed_array->size;
1817 type = (type_t*) array_type;
1821 type_t *hashed_type = typehash_insert((type_t*) type);
1822 if(hashed_type != type) {
1831 static declaration_t *parse_declarator(
1832 const declaration_specifiers_t *specifiers,
1833 type_t *type, bool may_be_abstract)
1835 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1836 declaration->storage_class = specifiers->storage_class;
1837 declaration->is_inline = specifiers->is_inline;
1839 construct_type_t *construct_type
1840 = parse_inner_declarator(declaration, may_be_abstract);
1841 declaration->type = construct_declarator_type(construct_type, type);
1843 if(construct_type != NULL) {
1844 obstack_free(&temp_obst, construct_type);
1850 static type_t *parse_abstract_declarator(type_t *base_type)
1852 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
1854 type_t *result = construct_declarator_type(construct_type, base_type);
1855 if(construct_type != NULL) {
1856 obstack_free(&temp_obst, construct_type);
1862 static declaration_t *record_declaration(declaration_t *declaration)
1864 assert(context != NULL);
1866 symbol_t *symbol = declaration->symbol;
1867 if(symbol != NULL) {
1868 declaration_t *alias = environment_push(declaration);
1869 if(alias != declaration)
1872 declaration->parent_context = context;
1875 if(last_declaration != NULL) {
1876 last_declaration->next = declaration;
1878 context->declarations = declaration;
1880 last_declaration = declaration;
1885 static void parser_error_multiple_definition(declaration_t *previous,
1886 declaration_t *declaration)
1888 parser_print_error_prefix_pos(declaration->source_position);
1889 fprintf(stderr, "multiple definition of symbol '%s'\n",
1890 declaration->symbol->string);
1891 parser_print_error_prefix_pos(previous->source_position);
1892 fprintf(stderr, "this is the location of the previous "
1896 static void parse_init_declarators(const declaration_specifiers_t *specifiers)
1899 declaration_t *ndeclaration
1900 = parse_declarator(specifiers, specifiers->type, false);
1902 declaration_t *declaration = record_declaration(ndeclaration);
1904 type_t *type = declaration->type;
1905 if(type->type != TYPE_FUNCTION && declaration->is_inline) {
1906 parser_print_warning_prefix_pos(declaration->source_position);
1907 fprintf(stderr, "variable ‘%s’ declared ‘inline’\n",
1908 declaration->symbol->string);
1911 if(token.type == '=') {
1914 /* TODO: check that this is an allowed type (no function type) */
1916 if(declaration->init.initializer != NULL) {
1917 parser_error_multiple_definition(declaration, ndeclaration);
1920 ndeclaration->init.initializer = parse_initializer(declaration->type);
1921 } else if(token.type == '{') {
1922 if(declaration->type->type != TYPE_FUNCTION) {
1923 parser_print_error_prefix();
1924 fprintf(stderr, "Declarator ");
1925 print_type_ext(declaration->type, declaration->symbol, NULL);
1926 fprintf(stderr, " has a body but is not a function type.\n");
1931 if(declaration->init.statement != NULL) {
1932 parser_error_multiple_definition(declaration, ndeclaration);
1934 if(ndeclaration != declaration) {
1935 memcpy(&declaration->context, &ndeclaration->context,
1936 sizeof(declaration->context));
1939 int top = environment_top();
1940 context_t *last_context = context;
1941 set_context(&declaration->context);
1943 /* push function parameters */
1944 declaration_t *parameter = declaration->context.declarations;
1945 for( ; parameter != NULL; parameter = parameter->next) {
1946 environment_push(parameter);
1949 int label_stack_top = label_top();
1950 declaration_t *old_current_function = current_function;
1951 current_function = declaration;
1953 statement_t *statement = parse_compound_statement();
1955 assert(current_function == declaration);
1956 current_function = old_current_function;
1957 label_pop_to(label_stack_top);
1959 assert(context == &declaration->context);
1960 set_context(last_context);
1961 environment_pop_to(top);
1963 declaration->init.statement = statement;
1967 if(token.type != ',')
1974 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
1977 if(token.type == ':') {
1979 parse_constant_expression();
1980 /* TODO (bitfields) */
1982 declaration_t *declaration
1983 = parse_declarator(specifiers, specifiers->type, true);
1985 /* TODO: check constraints for struct declarations */
1986 /* TODO: check for doubled fields */
1987 record_declaration(declaration);
1989 if(token.type == ':') {
1991 parse_constant_expression();
1992 /* TODO (bitfields) */
1996 if(token.type != ',')
2003 static void parse_compound_type_entries(void)
2007 while(token.type != '}' && token.type != T_EOF) {
2008 declaration_specifiers_t specifiers;
2009 memset(&specifiers, 0, sizeof(specifiers));
2010 parse_declaration_specifiers(&specifiers);
2012 parse_struct_declarators(&specifiers);
2014 if(token.type == T_EOF) {
2015 parse_error("unexpected error while parsing struct");
2020 static void parse_declaration(void)
2022 source_position_t source_position = token.source_position;
2024 declaration_specifiers_t specifiers;
2025 memset(&specifiers, 0, sizeof(specifiers));
2026 parse_declaration_specifiers(&specifiers);
2028 if(token.type == ';') {
2029 if (specifiers.storage_class != STORAGE_CLASS_NONE) {
2030 parse_warning_pos(source_position,
2031 "useless keyword in empty declaration");
2033 switch (specifiers.type->type) {
2034 case TYPE_COMPOUND_STRUCT:
2035 case TYPE_COMPOUND_UNION: {
2036 const compound_type_t *const comp_type =
2037 (const compound_type_t*)specifiers.type;
2038 if (comp_type->declaration->symbol == NULL) {
2039 parse_warning_pos(source_position,
2040 "unnamed struct/union that defines no instances");
2045 case TYPE_ENUM: break;
2048 parse_warning_pos(source_position, "empty declaration");
2054 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2056 declaration->type = specifiers.type;
2057 declaration->storage_class = specifiers.storage_class;
2058 declaration->source_position = source_position;
2059 record_declaration(declaration);
2062 parse_init_declarators(&specifiers);
2065 static type_t *parse_typename(void)
2067 declaration_specifiers_t specifiers;
2068 memset(&specifiers, 0, sizeof(specifiers));
2069 parse_declaration_specifiers(&specifiers);
2070 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2071 /* TODO: improve error message, user does probably not know what a
2072 * storage class is...
2074 parse_error("typename may not have a storage class");
2077 type_t *result = parse_abstract_declarator(specifiers.type);
2085 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2086 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2087 expression_t *left);
2089 typedef struct expression_parser_function_t expression_parser_function_t;
2090 struct expression_parser_function_t {
2091 unsigned precedence;
2092 parse_expression_function parser;
2093 unsigned infix_precedence;
2094 parse_expression_infix_function infix_parser;
2097 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2099 static expression_t *make_invalid_expression(void)
2101 expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
2102 expression->type = EXPR_INVALID;
2103 expression->source_position = token.source_position;
2107 static expression_t *expected_expression_error(void)
2109 parser_print_error_prefix();
2110 fprintf(stderr, "expected expression, got token ");
2111 print_token(stderr, & token);
2112 fprintf(stderr, "\n");
2116 return make_invalid_expression();
2119 static expression_t *parse_string_const(void)
2121 string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
2123 cnst->expression.type = EXPR_STRING_LITERAL;
2124 cnst->expression.datatype = type_string;
2125 cnst->value = parse_string_literals();
2127 return (expression_t*) cnst;
2130 static expression_t *parse_int_const(void)
2132 const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
2134 cnst->expression.type = EXPR_CONST;
2135 cnst->expression.datatype = type_int;
2136 cnst->v.int_value = token.v.intvalue;
2140 return (expression_t*) cnst;
2143 static expression_t *parse_float_const(void)
2145 const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
2147 cnst->expression.type = EXPR_CONST;
2148 cnst->expression.datatype = type_double;
2149 cnst->v.float_value = token.v.floatvalue;
2153 return (expression_t*) cnst;
2156 static declaration_t *create_implicit_function(symbol_t *symbol,
2157 const source_position_t source_position)
2159 function_type_t *function_type
2160 = allocate_type_zero(sizeof(function_type[0]));
2162 function_type->type.type = TYPE_FUNCTION;
2163 function_type->result_type = type_int;
2164 function_type->unspecified_parameters = true;
2166 type_t *type = typehash_insert((type_t*) function_type);
2167 if(type != (type_t*) function_type) {
2168 free_type(function_type);
2171 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2173 declaration->storage_class = STORAGE_CLASS_EXTERN;
2174 declaration->type = type;
2175 declaration->symbol = symbol;
2176 declaration->source_position = source_position;
2178 /* prepend the implicit definition to the global context
2179 * this is safe since the symbol wasn't declared as anything else yet
2181 assert(symbol->declaration == NULL);
2183 context_t *last_context = context;
2184 context = global_context;
2186 environment_push(declaration);
2187 declaration->next = context->declarations;
2188 context->declarations = declaration;
2190 context = last_context;
2195 static expression_t *parse_reference(void)
2197 reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
2199 ref->expression.type = EXPR_REFERENCE;
2200 ref->symbol = token.v.symbol;
2202 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
2204 source_position_t source_position = token.source_position;
2207 if(declaration == NULL) {
2209 /* an implicitely defined function */
2210 if(token.type == '(') {
2211 parser_print_prefix_pos(token.source_position);
2212 fprintf(stderr, "warning: implicit declaration of function '%s'\n",
2213 ref->symbol->string);
2215 declaration = create_implicit_function(ref->symbol,
2220 parser_print_error_prefix();
2221 fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string);
2222 return (expression_t*) ref;
2226 ref->declaration = declaration;
2227 ref->expression.datatype = declaration->type;
2229 return (expression_t*) ref;
2232 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
2236 /* TODO check if explicit cast is allowed and issue warnings/errors */
2239 static expression_t *parse_cast(void)
2241 unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
2243 cast->expression.type = EXPR_UNARY;
2244 cast->type = UNEXPR_CAST;
2245 cast->expression.source_position = token.source_position;
2247 type_t *type = parse_typename();
2250 expression_t *value = parse_sub_expression(20);
2252 check_cast_allowed(value, type);
2254 cast->expression.datatype = type;
2255 cast->value = value;
2257 return (expression_t*) cast;
2260 static expression_t *parse_statement_expression(void)
2262 statement_expression_t *expression
2263 = allocate_ast_zero(sizeof(expression[0]));
2264 expression->expression.type = EXPR_STATEMENT;
2266 statement_t *statement = parse_compound_statement();
2267 expression->statement = statement;
2268 if(statement == NULL) {
2273 assert(statement->type == STATEMENT_COMPOUND);
2274 compound_statement_t *compound_statement
2275 = (compound_statement_t*) statement;
2277 /* find last statement and use it's type */
2278 const statement_t *last_statement = NULL;
2279 const statement_t *iter = compound_statement->statements;
2280 for( ; iter != NULL; iter = iter->next) {
2281 last_statement = iter;
2284 if(last_statement->type == STATEMENT_EXPRESSION) {
2285 const expression_statement_t *expression_statement =
2286 (const expression_statement_t*) last_statement;
2287 expression->expression.datatype
2288 = expression_statement->expression->datatype;
2290 expression->expression.datatype = type_void;
2295 return (expression_t*) expression;
2298 static expression_t *parse_brace_expression(void)
2302 switch(token.type) {
2304 /* gcc extension: a stement expression */
2305 return parse_statement_expression();
2309 return parse_cast();
2311 if(is_typedef_symbol(token.v.symbol)) {
2312 return parse_cast();
2316 expression_t *result = parse_expression();
2322 static expression_t *parse_function_keyword(void)
2324 eat(T___FUNCTION__);
2327 string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
2328 expression->expression.type = EXPR_FUNCTION;
2329 expression->expression.datatype = type_string;
2330 expression->value = "TODO: FUNCTION";
2332 return (expression_t*) expression;
2335 static expression_t *parse_pretty_function_keyword(void)
2337 eat(T___PRETTY_FUNCTION__);
2340 string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
2341 expression->expression.type = EXPR_PRETTY_FUNCTION;
2342 expression->expression.datatype = type_string;
2343 expression->value = "TODO: PRETTY FUNCTION";
2345 return (expression_t*) expression;
2348 static designator_t *parse_designator(void)
2350 designator_t *result = allocate_ast_zero(sizeof(result[0]));
2352 if(token.type != T_IDENTIFIER) {
2353 parse_error_expected("while parsing member designator",
2358 result->symbol = token.v.symbol;
2361 designator_t *last_designator = result;
2363 if(token.type == '.') {
2365 if(token.type != T_IDENTIFIER) {
2366 parse_error_expected("while parsing member designator",
2371 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
2372 designator->symbol = token.v.symbol;
2375 last_designator->next = designator;
2376 last_designator = designator;
2379 if(token.type == '[') {
2381 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
2382 designator->array_access = parse_expression();
2383 if(designator->array_access == NULL) {
2389 last_designator->next = designator;
2390 last_designator = designator;
2399 static expression_t *parse_offsetof(void)
2401 eat(T___builtin_offsetof);
2403 offsetof_expression_t *expression
2404 = allocate_ast_zero(sizeof(expression[0]));
2405 expression->expression.type = EXPR_OFFSETOF;
2406 expression->expression.datatype = type_size_t;
2409 expression->type = parse_typename();
2411 expression->designator = parse_designator();
2414 return (expression_t*) expression;
2417 static expression_t *parse_va_arg(void)
2419 eat(T___builtin_va_arg);
2421 va_arg_expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
2422 expression->expression.type = EXPR_VA_ARG;
2425 expression->arg = parse_assignment_expression();
2427 expression->expression.datatype = parse_typename();
2430 return (expression_t*) expression;
2433 static expression_t *parse_builtin_symbol(void)
2435 builtin_symbol_expression_t *expression
2436 = allocate_ast_zero(sizeof(expression[0]));
2437 expression->expression.type = EXPR_BUILTIN_SYMBOL;
2439 /* TODO: set datatype */
2441 expression->symbol = token.v.symbol;
2445 return (expression_t*) expression;
2448 static expression_t *parse_primary_expression(void)
2450 switch(token.type) {
2452 return parse_int_const();
2453 case T_FLOATINGPOINT:
2454 return parse_float_const();
2455 case T_STRING_LITERAL:
2456 return parse_string_const();
2458 return parse_reference();
2459 case T___FUNCTION__:
2460 return parse_function_keyword();
2461 case T___PRETTY_FUNCTION__:
2462 return parse_pretty_function_keyword();
2463 case T___builtin_offsetof:
2464 return parse_offsetof();
2465 case T___builtin_va_arg:
2466 return parse_va_arg();
2467 case T___builtin_expect:
2468 case T___builtin_va_start:
2469 case T___builtin_va_end:
2470 return parse_builtin_symbol();
2473 return parse_brace_expression();
2476 parser_print_error_prefix();
2477 fprintf(stderr, "unexpected token ");
2478 print_token(stderr, &token);
2479 fprintf(stderr, "\n");
2482 return make_invalid_expression();
2485 static expression_t *parse_array_expression(unsigned precedence,
2486 expression_t *array_ref)
2492 array_access_expression_t *array_access
2493 = allocate_ast_zero(sizeof(array_access[0]));
2495 array_access->expression.type = EXPR_ARRAY_ACCESS;
2496 array_access->array_ref = array_ref;
2497 array_access->index = parse_expression();
2499 type_t *type = array_ref->datatype;
2501 if(type->type == TYPE_POINTER) {
2502 pointer_type_t *pointer = (pointer_type_t*) type;
2503 array_access->expression.datatype = pointer->points_to;
2504 } else if(type->type == TYPE_ARRAY) {
2505 array_type_t *array_type = (array_type_t*) type;
2506 array_access->expression.datatype = array_type->element_type;
2508 parser_print_error_prefix();
2509 fprintf(stderr, "array access on object with non-pointer type ");
2510 print_type_quoted(type);
2511 fprintf(stderr, "\n");
2515 if(token.type != ']') {
2516 parse_error_expected("Problem while parsing array access", ']', 0);
2517 return (expression_t*) array_access;
2521 return (expression_t*) array_access;
2524 static bool is_declaration_specifier(const token_t *token,
2525 bool only_type_specifiers)
2527 switch(token->type) {
2531 return is_typedef_symbol(token->v.symbol);
2534 if(only_type_specifiers)
2543 static expression_t *parse_sizeof(unsigned precedence)
2547 sizeof_expression_t *sizeof_expression
2548 = allocate_ast_zero(sizeof(sizeof_expression[0]));
2549 sizeof_expression->expression.type = EXPR_SIZEOF;
2550 sizeof_expression->expression.datatype = type_size_t;
2552 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
2554 sizeof_expression->type = parse_typename();
2557 expression_t *expression = parse_sub_expression(precedence);
2558 sizeof_expression->type = expression->datatype;
2559 sizeof_expression->size_expression = expression;
2562 return (expression_t*) sizeof_expression;
2565 static expression_t *parse_select_expression(unsigned precedence,
2566 expression_t *compound)
2569 assert(token.type == '.' || token.type == T_MINUSGREATER);
2571 bool is_pointer = (token.type == T_MINUSGREATER);
2574 select_expression_t *select = allocate_ast_zero(sizeof(select[0]));
2576 select->expression.type = EXPR_SELECT;
2577 select->compound = compound;
2579 if(token.type != T_IDENTIFIER) {
2580 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
2581 return (expression_t*) select;
2583 symbol_t *symbol = token.v.symbol;
2584 select->symbol = symbol;
2587 type_t *type = compound->datatype;
2589 return make_invalid_expression();
2591 type_t *type_left = type;
2593 if(type->type != TYPE_POINTER) {
2594 parser_print_error_prefix();
2595 fprintf(stderr, "left hand side of '->' is not a pointer, but ");
2596 print_type_quoted(type);
2597 fputc('\n', stderr);
2598 return make_invalid_expression();
2600 pointer_type_t *pointer_type = (pointer_type_t*) type;
2601 type_left = pointer_type->points_to;
2603 type_left = skip_typeref(type_left);
2605 if(type_left->type != TYPE_COMPOUND_STRUCT
2606 && type_left->type != TYPE_COMPOUND_UNION) {
2607 parser_print_error_prefix();
2608 fprintf(stderr, "request for member '%s' in something not a struct or "
2609 "union, but ", symbol->string);
2610 print_type_quoted(type_left);
2611 fputc('\n', stderr);
2612 return make_invalid_expression();
2615 compound_type_t *compound_type = (compound_type_t*) type_left;
2616 declaration_t *declaration = compound_type->declaration;
2618 if(!declaration->init.is_defined) {
2619 parser_print_error_prefix();
2620 fprintf(stderr, "request for member '%s' of incomplete type ",
2622 print_type_quoted(type_left);
2623 fputc('\n', stderr);
2624 return make_invalid_expression();
2627 declaration_t *iter = declaration->context.declarations;
2628 for( ; iter != NULL; iter = iter->next) {
2629 if(iter->symbol == symbol) {
2634 parser_print_error_prefix();
2635 print_type_quoted(type_left);
2636 fprintf(stderr, " has no memeber named '%s'\n", symbol->string);
2637 return make_invalid_expression();
2640 select->compound_entry = iter;
2641 select->expression.datatype = iter->type;
2642 return (expression_t*) select;
2645 static expression_t *parse_call_expression(unsigned precedence,
2646 expression_t *expression)
2649 call_expression_t *call = allocate_ast_zero(sizeof(call[0]));
2650 call->expression.type = EXPR_CALL;
2651 call->function = expression;
2653 function_type_t *function_type;
2654 type_t *type = expression->datatype;
2655 if (type->type == TYPE_FUNCTION) {
2656 function_type = (function_type_t*) type;
2657 call->expression.datatype = function_type->result_type;
2658 } else if (type->type == TYPE_POINTER &&
2659 ((pointer_type_t*)type)->points_to->type == TYPE_FUNCTION) {
2660 pointer_type_t *const ptr_type = (pointer_type_t*)type;
2661 function_type = (function_type_t*)ptr_type->points_to;
2662 call->expression.datatype = function_type->result_type;
2664 parser_print_error_prefix();
2665 fputs("called object '", stderr);
2666 print_expression(expression);
2667 fputs("' (type ", stderr);
2668 print_type_quoted(type);
2669 fputs(") is not a function\n", stderr);
2671 function_type = NULL;
2672 call->expression.datatype = NULL;
2675 /* parse arguments */
2678 if(token.type != ')') {
2679 call_argument_t *last_argument = NULL;
2682 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
2684 argument->expression = parse_assignment_expression();
2685 if(last_argument == NULL) {
2686 call->arguments = argument;
2688 last_argument->next = argument;
2690 last_argument = argument;
2692 if(token.type != ',')
2699 if(function_type != NULL) {
2700 function_parameter_t *parameter = function_type->parameters;
2701 call_argument_t *argument = call->arguments;
2702 for( ; parameter != NULL && argument != NULL;
2703 parameter = parameter->next, argument = argument->next) {
2704 type_t *expected_type = parameter->type;
2705 /* TODO report context in error messages */
2706 argument->expression = create_implicit_cast(argument->expression,
2709 /* too few parameters */
2710 if(parameter != NULL) {
2711 parser_print_error_prefix();
2712 fprintf(stderr, "too few arguments to function '");
2713 print_expression(expression);
2714 fprintf(stderr, "'\n");
2715 } else if(argument != NULL) {
2716 /* too many parameters */
2717 if(!function_type->variadic
2718 && !function_type->unspecified_parameters) {
2719 parser_print_error_prefix();
2720 fprintf(stderr, "too many arguments to function '");
2721 print_expression(expression);
2722 fprintf(stderr, "'\n");
2724 /* do default promotion */
2725 for( ; argument != NULL; argument = argument->next) {
2726 type_t *type = argument->expression->datatype;
2731 if(is_type_integer(type)) {
2732 type = promote_integer(type);
2733 } else if(type == type_float) {
2736 argument->expression
2737 = create_implicit_cast(argument->expression, type);
2743 return (expression_t*) call;
2746 static type_t *get_type_after_conversion(const type_t *type1,
2747 const type_t *type2)
2751 return (type_t*) type1;
2754 static expression_t *parse_conditional_expression(unsigned precedence,
2755 expression_t *expression)
2759 conditional_expression_t *conditional
2760 = allocate_ast_zero(sizeof(conditional[0]));
2761 conditional->expression.type = EXPR_CONDITIONAL;
2762 conditional->condition = expression;
2765 type_t *condition_type = conditional->condition->datatype;
2766 if(condition_type != NULL) {
2767 if(!is_type_scalar(skip_typeref(condition_type))) {
2768 type_error("expected a scalar type", expression->source_position,
2773 conditional->true_expression = parse_expression();
2775 conditional->false_expression = parse_sub_expression(precedence);
2777 type_t *true_type = conditional->true_expression->datatype;
2778 if(true_type == NULL)
2779 return (expression_t*) conditional;
2780 type_t *false_type = conditional->false_expression->datatype;
2781 if(false_type == NULL)
2782 return (expression_t*) conditional;
2784 type_t *const skipped_true_type = skip_typeref(true_type);
2785 type_t *const skipped_false_type = skip_typeref(false_type);
2788 if (skipped_true_type == skipped_false_type) {
2789 conditional->expression.datatype = skipped_true_type;
2790 } else if (is_type_arithmetic(skipped_true_type) &&
2791 is_type_arithmetic(skipped_false_type)) {
2792 type_t *const result = get_type_after_conversion(skipped_true_type,
2793 skipped_false_type);
2794 /* TODO: create implicit convs if necessary */
2795 conditional->expression.datatype = result;
2796 } else if (skipped_true_type->type == TYPE_POINTER &&
2797 skipped_false_type->type == TYPE_POINTER &&
2798 true /* TODO compatible points_to types */) {
2800 } else if(/* (is_null_ptr_const(skipped_true_type) &&
2801 skipped_false_type->type == TYPE_POINTER)
2802 || (is_null_ptr_const(skipped_false_type) &&
2803 skipped_true_type->type == TYPE_POINTER) TODO*/ false) {
2805 } else if(/* 1 is pointer to object type, other is void* */ false) {
2808 type_error_incompatible("while parsing conditional",
2809 expression->source_position, true_type,
2810 skipped_false_type);
2813 return (expression_t*) conditional;
2816 static expression_t *parse_extension(unsigned precedence)
2818 eat(T___extension__);
2820 /* TODO enable extensions */
2822 return parse_sub_expression(precedence);
2825 static void semantic_incdec(unary_expression_t *expression)
2827 type_t *orig_type = expression->value->datatype;
2828 if(orig_type == NULL)
2831 type_t *type = skip_typeref(orig_type);
2832 if(!is_type_arithmetic(type) && type->type != TYPE_POINTER) {
2833 /* TODO: improve error message */
2834 parser_print_error_prefix();
2835 fprintf(stderr, "operation needs an arithmetic or pointer type\n");
2839 expression->expression.datatype = orig_type;
2842 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
2844 type_t *orig_type = expression->value->datatype;
2845 if(orig_type == NULL)
2848 type_t *type = skip_typeref(orig_type);
2849 if(!is_type_arithmetic(type)) {
2850 /* TODO: improve error message */
2851 parser_print_error_prefix();
2852 fprintf(stderr, "operation needs an arithmetic type\n");
2856 expression->expression.datatype = orig_type;
2859 static void semantic_dereference(unary_expression_t *expression)
2861 type_t *orig_type = expression->value->datatype;
2862 if(orig_type == NULL)
2865 type_t *type = skip_typeref(orig_type);
2866 switch (type->type) {
2868 array_type_t *const array_type = (array_type_t*)type;
2869 expression->expression.datatype = array_type->element_type;
2873 case TYPE_POINTER: {
2874 pointer_type_t *pointer_type = (pointer_type_t*)type;
2875 expression->expression.datatype = pointer_type->points_to;
2880 parser_print_error_prefix();
2881 fputs("'Unary *' needs pointer or arrray type, but type ", stderr);
2882 print_type_quoted(orig_type);
2883 fputs(" given.\n", stderr);
2888 static void semantic_take_addr(unary_expression_t *expression)
2890 type_t *orig_type = expression->value->datatype;
2891 if(orig_type == NULL)
2894 expression_t *value = expression->value;
2895 if(value->type == EXPR_REFERENCE) {
2896 reference_expression_t *reference = (reference_expression_t*) value;
2897 declaration_t *declaration = reference->declaration;
2898 if(declaration != NULL) {
2899 declaration->address_taken = 1;
2903 expression->expression.datatype = make_pointer_type(orig_type, 0);
2906 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
2907 static expression_t *parse_##unexpression_type(unsigned precedence) \
2911 unary_expression_t *unary_expression \
2912 = allocate_ast_zero(sizeof(unary_expression[0])); \
2913 unary_expression->expression.type = EXPR_UNARY; \
2914 unary_expression->type = unexpression_type; \
2915 unary_expression->value = parse_sub_expression(precedence); \
2917 sfunc(unary_expression); \
2919 return (expression_t*) unary_expression; \
2922 CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE, semantic_unexpr_arithmetic)
2923 CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS, semantic_unexpr_arithmetic)
2924 CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT, semantic_unexpr_arithmetic)
2925 CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE, semantic_dereference)
2926 CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS, semantic_take_addr)
2927 CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE,
2928 semantic_unexpr_arithmetic)
2929 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT,
2931 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_PREFIX_DECREMENT,
2934 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
2936 static expression_t *parse_##unexpression_type(unsigned precedence, \
2937 expression_t *left) \
2939 (void) precedence; \
2942 unary_expression_t *unary_expression \
2943 = allocate_ast_zero(sizeof(unary_expression[0])); \
2944 unary_expression->expression.type = EXPR_UNARY; \
2945 unary_expression->type = unexpression_type; \
2946 unary_expression->value = left; \
2948 sfunc(unary_expression); \
2950 return (expression_t*) unary_expression; \
2953 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT,
2955 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT,
2958 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
2960 /* TODO: handle complex + imaginary types */
2962 /* § 6.3.1.8 Usual arithmetic conversions */
2963 if(type_left == type_long_double || type_right == type_long_double) {
2964 return type_long_double;
2965 } else if(type_left == type_double || type_right == type_double) {
2967 } else if(type_left == type_float || type_right == type_float) {
2971 type_right = promote_integer(type_right);
2972 type_left = promote_integer(type_left);
2974 if(type_left == type_right)
2977 bool signed_left = is_type_signed(type_left);
2978 bool signed_right = is_type_signed(type_right);
2979 if(get_rank(type_left) < get_rank(type_right)) {
2980 if(signed_left == signed_right || !signed_right) {
2986 if(signed_left == signed_right || !signed_left) {
2994 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
2996 expression_t *left = expression->left;
2997 expression_t *right = expression->right;
2998 type_t *orig_type_left = left->datatype;
2999 type_t *orig_type_right = right->datatype;
3001 if(orig_type_left == NULL || orig_type_right == NULL)
3004 type_t *type_left = skip_typeref(orig_type_left);
3005 type_t *type_right = skip_typeref(orig_type_right);
3007 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
3008 /* TODO: improve error message */
3009 parser_print_error_prefix();
3010 fprintf(stderr, "operation needs arithmetic types\n");
3014 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
3015 expression->left = create_implicit_cast(left, arithmetic_type);
3016 expression->right = create_implicit_cast(right, arithmetic_type);
3017 expression->expression.datatype = arithmetic_type;
3020 static void semantic_shift_op(binary_expression_t *expression)
3022 expression_t *left = expression->left;
3023 expression_t *right = expression->right;
3024 type_t *orig_type_left = left->datatype;
3025 type_t *orig_type_right = right->datatype;
3027 if(orig_type_left == NULL || orig_type_right == NULL)
3030 type_t *type_left = skip_typeref(orig_type_left);
3031 type_t *type_right = skip_typeref(orig_type_right);
3033 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
3034 /* TODO: improve error message */
3035 parser_print_error_prefix();
3036 fprintf(stderr, "operation needs integer types\n");
3040 type_left = promote_integer(type_left);
3041 type_right = promote_integer(type_right);
3043 expression->left = create_implicit_cast(left, type_left);
3044 expression->right = create_implicit_cast(right, type_right);
3045 expression->expression.datatype = type_left;
3048 static void semantic_add(binary_expression_t *expression)
3050 expression_t *left = expression->left;
3051 expression_t *right = expression->right;
3052 type_t *orig_type_left = left->datatype;
3053 type_t *orig_type_right = right->datatype;
3055 if(orig_type_left == NULL || orig_type_right == NULL)
3058 type_t *type_left = skip_typeref(orig_type_left);
3059 type_t *type_right = skip_typeref(orig_type_right);
3062 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
3063 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
3064 expression->left = create_implicit_cast(left, arithmetic_type);
3065 expression->right = create_implicit_cast(right, arithmetic_type);
3066 expression->expression.datatype = arithmetic_type;
3068 } else if(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
3069 expression->expression.datatype = type_left;
3070 } else if(type_right->type == TYPE_POINTER && is_type_integer(type_left)) {
3071 expression->expression.datatype = type_right;
3073 parser_print_error_prefix();
3074 fprintf(stderr, "invalid operands to binary + (");
3075 print_type_quoted(orig_type_left);
3076 fprintf(stderr, ", ");
3077 print_type_quoted(orig_type_right);
3078 fprintf(stderr, ")\n");
3082 static void semantic_sub(binary_expression_t *expression)
3084 expression_t *left = expression->left;
3085 expression_t *right = expression->right;
3086 type_t *orig_type_left = left->datatype;
3087 type_t *orig_type_right = right->datatype;
3089 if(orig_type_left == NULL || orig_type_right == NULL)
3092 type_t *type_left = skip_typeref(orig_type_left);
3093 type_t *type_right = skip_typeref(orig_type_right);
3096 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
3097 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
3098 expression->left = create_implicit_cast(left, arithmetic_type);
3099 expression->right = create_implicit_cast(right, arithmetic_type);
3100 expression->expression.datatype = arithmetic_type;
3102 } else if(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
3103 expression->expression.datatype = type_left;
3104 } else if(type_left->type == TYPE_POINTER &&
3105 type_right->type == TYPE_POINTER) {
3106 if(!pointers_compatible(type_left, type_right)) {
3107 parser_print_error_prefix();
3108 fprintf(stderr, "pointers to incompatible objects to binary - (");
3109 print_type_quoted(orig_type_left);
3110 fprintf(stderr, ", ");
3111 print_type_quoted(orig_type_right);
3112 fprintf(stderr, ")\n");
3114 expression->expression.datatype = type_ptrdiff_t;
3117 parser_print_error_prefix();
3118 fprintf(stderr, "invalid operands to binary - (");
3119 print_type_quoted(orig_type_left);
3120 fprintf(stderr, ", ");
3121 print_type_quoted(orig_type_right);
3122 fprintf(stderr, ")\n");
3126 static void semantic_comparison(binary_expression_t *expression)
3128 expression_t *left = expression->left;
3129 expression_t *right = expression->right;
3130 type_t *orig_type_left = left->datatype;
3131 type_t *orig_type_right = right->datatype;
3133 if(orig_type_left == NULL || orig_type_right == NULL)
3136 type_t *type_left = skip_typeref(orig_type_left);
3137 type_t *type_right = skip_typeref(orig_type_right);
3139 /* TODO non-arithmetic types */
3140 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
3141 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
3142 expression->left = create_implicit_cast(left, arithmetic_type);
3143 expression->right = create_implicit_cast(right, arithmetic_type);
3144 expression->expression.datatype = arithmetic_type;
3145 } else if (type_left->type == TYPE_POINTER &&
3146 type_right->type == TYPE_POINTER) {
3147 /* TODO check compatibility */
3148 } else if (type_left->type == TYPE_POINTER) {
3149 expression->right = create_implicit_cast(right, type_left);
3150 } else if (type_right->type == TYPE_POINTER) {
3151 expression->left = create_implicit_cast(left, type_right);
3153 type_error_incompatible("invalid operands in comparison",
3154 expression->expression.source_position,
3155 type_left, type_right);
3157 expression->expression.datatype = type_int;
3160 static void semantic_arithmetic_assign(binary_expression_t *expression)
3162 expression_t *left = expression->left;
3163 expression_t *right = expression->right;
3164 type_t *orig_type_left = left->datatype;
3165 type_t *orig_type_right = right->datatype;
3167 if(orig_type_left == NULL || orig_type_right == NULL)
3170 type_t *type_left = skip_typeref(orig_type_left);
3171 type_t *type_right = skip_typeref(orig_type_right);
3173 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
3174 /* TODO: improve error message */
3175 parser_print_error_prefix();
3176 fprintf(stderr, "operation needs arithmetic types\n");
3180 /* combined instructions are tricky. We can't create an implicit cast on
3181 * the left side, because we need the uncasted form for the store.
3182 * The ast2firm pass has to know that left_type must be right_type
3183 * for the arithmeitc operation and create a cast by itself */
3184 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
3185 expression->right = create_implicit_cast(right, arithmetic_type);
3186 expression->expression.datatype = type_left;
3189 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
3191 expression_t *left = expression->left;
3192 expression_t *right = expression->right;
3193 type_t *orig_type_left = left->datatype;
3194 type_t *orig_type_right = right->datatype;
3196 if(orig_type_left == NULL || orig_type_right == NULL)
3199 type_t *type_left = skip_typeref(orig_type_left);
3200 type_t *type_right = skip_typeref(orig_type_right);
3202 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
3203 /* combined instructions are tricky. We can't create an implicit cast on
3204 * the left side, because we need the uncasted form for the store.
3205 * The ast2firm pass has to know that left_type must be right_type
3206 * for the arithmeitc operation and create a cast by itself */
3207 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
3208 expression->right = create_implicit_cast(right, arithmetic_type);
3209 expression->expression.datatype = type_left;
3210 } else if (type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
3211 expression->expression.datatype = type_left;
3213 parser_print_error_prefix();
3214 fputs("Incompatible types ", stderr);
3215 print_type_quoted(orig_type_left);
3216 fputs(" and ", stderr);
3217 print_type_quoted(orig_type_right);
3218 fputs(" in assignment\n", stderr);
3223 static void semantic_logical_op(binary_expression_t *expression)
3225 expression_t *left = expression->left;
3226 expression_t *right = expression->right;
3227 type_t *orig_type_left = left->datatype;
3228 type_t *orig_type_right = right->datatype;
3230 if(orig_type_left == NULL || orig_type_right == NULL)
3233 type_t *type_left = skip_typeref(orig_type_left);
3234 type_t *type_right = skip_typeref(orig_type_right);
3236 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
3237 /* TODO: improve error message */
3238 parser_print_error_prefix();
3239 fprintf(stderr, "operation needs scalar types\n");
3243 expression->expression.datatype = type_int;
3246 static void semantic_binexpr_assign(binary_expression_t *expression)
3248 expression_t *left = expression->left;
3249 type_t *type_left = left->datatype;
3251 if (type_left->type == TYPE_ARRAY) {
3252 parse_error("Cannot assign to arrays.");
3253 } else if (type_left != NULL) {
3254 semantic_assign(type_left, &expression->right, "assignment");
3257 expression->expression.datatype = type_left;
3260 static void semantic_comma(binary_expression_t *expression)
3262 expression->expression.datatype = expression->right->datatype;
3265 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
3266 static expression_t *parse_##binexpression_type(unsigned precedence, \
3267 expression_t *left) \
3271 expression_t *right = parse_sub_expression(precedence + lr); \
3273 binary_expression_t *binexpr \
3274 = allocate_ast_zero(sizeof(binexpr[0])); \
3275 binexpr->expression.type = EXPR_BINARY; \
3276 binexpr->type = binexpression_type; \
3277 binexpr->left = left; \
3278 binexpr->right = right; \
3281 return (expression_t*) binexpr; \
3284 CREATE_BINEXPR_PARSER(',', BINEXPR_COMMA, semantic_comma, 1)
3285 CREATE_BINEXPR_PARSER('*', BINEXPR_MUL, semantic_binexpr_arithmetic, 1)
3286 CREATE_BINEXPR_PARSER('/', BINEXPR_DIV, semantic_binexpr_arithmetic, 1)
3287 CREATE_BINEXPR_PARSER('%', BINEXPR_MOD, semantic_binexpr_arithmetic, 1)
3288 CREATE_BINEXPR_PARSER('+', BINEXPR_ADD, semantic_add, 1)
3289 CREATE_BINEXPR_PARSER('-', BINEXPR_SUB, semantic_sub, 1)
3290 CREATE_BINEXPR_PARSER('<', BINEXPR_LESS, semantic_comparison, 1)
3291 CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER, semantic_comparison, 1)
3292 CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN, semantic_binexpr_assign, 0)
3293 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL, semantic_comparison, 1)
3294 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, BINEXPR_NOTEQUAL,
3295 semantic_comparison, 1)
3296 CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL, semantic_comparison, 1)
3297 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL,
3298 semantic_comparison, 1)
3299 CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND, semantic_binexpr_arithmetic, 1)
3300 CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR, semantic_binexpr_arithmetic, 1)
3301 CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR, semantic_binexpr_arithmetic, 1)
3302 CREATE_BINEXPR_PARSER(T_ANDAND, BINEXPR_LOGICAL_AND, semantic_logical_op, 1)
3303 CREATE_BINEXPR_PARSER(T_PIPEPIPE, BINEXPR_LOGICAL_OR, semantic_logical_op, 1)
3304 /* TODO shift has a bit special semantic */
3305 CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT,
3306 semantic_shift_op, 1)
3307 CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT,
3308 semantic_shift_op, 1)
3309 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, BINEXPR_ADD_ASSIGN,
3310 semantic_arithmetic_addsubb_assign, 0)
3311 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, BINEXPR_SUB_ASSIGN,
3312 semantic_arithmetic_addsubb_assign, 0)
3313 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, BINEXPR_MUL_ASSIGN,
3314 semantic_arithmetic_assign, 0)
3315 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_DIV_ASSIGN,
3316 semantic_arithmetic_assign, 0)
3317 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, BINEXPR_MOD_ASSIGN,
3318 semantic_arithmetic_assign, 0)
3319 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, BINEXPR_SHIFTLEFT_ASSIGN,
3320 semantic_arithmetic_assign, 0)
3321 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, BINEXPR_SHIFTRIGHT_ASSIGN,
3322 semantic_arithmetic_assign, 0)
3323 CREATE_BINEXPR_PARSER(T_ANDEQUAL, BINEXPR_BITWISE_AND_ASSIGN,
3324 semantic_arithmetic_assign, 0)
3325 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, BINEXPR_BITWISE_OR_ASSIGN,
3326 semantic_arithmetic_assign, 0)
3327 CREATE_BINEXPR_PARSER(T_CARETEQUAL, BINEXPR_BITWISE_XOR_ASSIGN,
3328 semantic_arithmetic_assign, 0)
3330 static expression_t *parse_sub_expression(unsigned precedence)
3332 if(token.type < 0) {
3333 return expected_expression_error();
3336 expression_parser_function_t *parser
3337 = &expression_parsers[token.type];
3338 source_position_t source_position = token.source_position;
3341 if(parser->parser != NULL) {
3342 left = parser->parser(parser->precedence);
3344 left = parse_primary_expression();
3346 assert(left != NULL);
3347 left->source_position = source_position;
3350 if(token.type < 0) {
3351 return expected_expression_error();
3354 parser = &expression_parsers[token.type];
3355 if(parser->infix_parser == NULL)
3357 if(parser->infix_precedence < precedence)
3360 left = parser->infix_parser(parser->infix_precedence, left);
3362 assert(left != NULL);
3363 assert(left->type != EXPR_UNKNOWN);
3364 left->source_position = source_position;
3370 static expression_t *parse_expression(void)
3372 return parse_sub_expression(1);
3377 static void register_expression_parser(parse_expression_function parser,
3378 int token_type, unsigned precedence)
3380 expression_parser_function_t *entry = &expression_parsers[token_type];
3382 if(entry->parser != NULL) {
3383 fprintf(stderr, "for token ");
3384 print_token_type(stderr, token_type);
3385 fprintf(stderr, "\n");
3386 panic("trying to register multiple expression parsers for a token");
3388 entry->parser = parser;
3389 entry->precedence = precedence;
3392 static void register_expression_infix_parser(
3393 parse_expression_infix_function parser, int token_type,
3394 unsigned precedence)
3396 expression_parser_function_t *entry = &expression_parsers[token_type];
3398 if(entry->infix_parser != NULL) {
3399 fprintf(stderr, "for token ");
3400 print_token_type(stderr, token_type);
3401 fprintf(stderr, "\n");
3402 panic("trying to register multiple infix expression parsers for a "
3405 entry->infix_parser = parser;
3406 entry->infix_precedence = precedence;
3409 static void init_expression_parsers(void)
3411 memset(&expression_parsers, 0, sizeof(expression_parsers));
3413 register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16);
3414 register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16);
3415 register_expression_infix_parser(parse_BINEXPR_MOD, '%', 16);
3416 register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT, T_LESSLESS, 16);
3417 register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT,
3418 T_GREATERGREATER, 16);
3419 register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15);
3420 register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15);
3421 register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14);
3422 register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14);
3423 register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14);
3424 register_expression_infix_parser(parse_BINEXPR_GREATEREQUAL,
3425 T_GREATEREQUAL, 14);
3426 register_expression_infix_parser(parse_BINEXPR_EQUAL, T_EQUALEQUAL, 13);
3427 register_expression_infix_parser(parse_BINEXPR_NOTEQUAL,
3428 T_EXCLAMATIONMARKEQUAL, 13);
3429 register_expression_infix_parser(parse_BINEXPR_BITWISE_AND, '&', 12);
3430 register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR, '^', 11);
3431 register_expression_infix_parser(parse_BINEXPR_BITWISE_OR, '|', 10);
3432 register_expression_infix_parser(parse_BINEXPR_LOGICAL_AND, T_ANDAND, 9);
3433 register_expression_infix_parser(parse_BINEXPR_LOGICAL_OR, T_PIPEPIPE, 8);
3434 register_expression_infix_parser(parse_conditional_expression, '?', 7);
3435 register_expression_infix_parser(parse_BINEXPR_ASSIGN, '=', 2);
3436 register_expression_infix_parser(parse_BINEXPR_ADD_ASSIGN, T_PLUSEQUAL, 2);
3437 register_expression_infix_parser(parse_BINEXPR_SUB_ASSIGN, T_MINUSEQUAL, 2);
3438 register_expression_infix_parser(parse_BINEXPR_MUL_ASSIGN,
3439 T_ASTERISKEQUAL, 2);
3440 register_expression_infix_parser(parse_BINEXPR_DIV_ASSIGN, T_SLASHEQUAL, 2);
3441 register_expression_infix_parser(parse_BINEXPR_MOD_ASSIGN,
3443 register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT_ASSIGN,
3444 T_LESSLESSEQUAL, 2);
3445 register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT_ASSIGN,
3446 T_GREATERGREATEREQUAL, 2);
3447 register_expression_infix_parser(parse_BINEXPR_BITWISE_AND_ASSIGN,
3449 register_expression_infix_parser(parse_BINEXPR_BITWISE_OR_ASSIGN,
3451 register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR_ASSIGN,
3454 register_expression_infix_parser(parse_BINEXPR_COMMA, ',', 1);
3456 register_expression_infix_parser(parse_array_expression, '[', 30);
3457 register_expression_infix_parser(parse_call_expression, '(', 30);
3458 register_expression_infix_parser(parse_select_expression, '.', 30);
3459 register_expression_infix_parser(parse_select_expression,
3460 T_MINUSGREATER, 30);
3461 register_expression_infix_parser(parse_UNEXPR_POSTFIX_INCREMENT,
3463 register_expression_infix_parser(parse_UNEXPR_POSTFIX_DECREMENT,
3466 register_expression_parser(parse_UNEXPR_NEGATE, '-', 25);
3467 register_expression_parser(parse_UNEXPR_PLUS, '+', 25);
3468 register_expression_parser(parse_UNEXPR_NOT, '!', 25);
3469 register_expression_parser(parse_UNEXPR_BITWISE_NEGATE, '~', 25);
3470 register_expression_parser(parse_UNEXPR_DEREFERENCE, '*', 25);
3471 register_expression_parser(parse_UNEXPR_TAKE_ADDRESS, '&', 25);
3472 register_expression_parser(parse_UNEXPR_PREFIX_INCREMENT, T_PLUSPLUS, 25);
3473 register_expression_parser(parse_UNEXPR_PREFIX_DECREMENT, T_MINUSMINUS, 25);
3474 register_expression_parser(parse_sizeof, T_sizeof, 25);
3475 register_expression_parser(parse_extension, T___extension__, 25);
3479 static statement_t *parse_case_statement(void)
3482 case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
3483 label->statement.type = STATEMENT_CASE_LABEL;
3484 label->statement.source_position = token.source_position;
3486 label->expression = parse_expression();
3489 label->statement.next = parse_statement();
3491 return (statement_t*) label;
3494 static statement_t *parse_default_statement(void)
3498 case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
3499 label->statement.type = STATEMENT_CASE_LABEL;
3500 label->statement.source_position = token.source_position;
3503 label->statement.next = parse_statement();
3505 return (statement_t*) label;
3508 static declaration_t *get_label(symbol_t *symbol)
3510 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
3511 assert(current_function != NULL);
3512 /* if we found a label in the same function, then we already created the
3514 if(candidate != NULL
3515 && candidate->parent_context == ¤t_function->context) {
3519 /* otherwise we need to create a new one */
3520 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
3521 declaration->namespace = NAMESPACE_LABEL;
3522 declaration->symbol = symbol;
3524 label_push(declaration);
3529 static statement_t *parse_label_statement(void)
3531 assert(token.type == T_IDENTIFIER);
3532 symbol_t *symbol = token.v.symbol;
3535 declaration_t *label = get_label(symbol);
3537 /* if source position is already set then the label is defined twice,
3538 * otherwise it was just mentioned in a goto so far */
3539 if(label->source_position.input_name != NULL) {
3540 parser_print_error_prefix();
3541 fprintf(stderr, "duplicate label '%s'\n", symbol->string);
3542 parser_print_error_prefix_pos(label->source_position);
3543 fprintf(stderr, "previous definition of '%s' was here\n",
3546 label->source_position = token.source_position;
3549 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
3551 label_statement->statement.type = STATEMENT_LABEL;
3552 label_statement->statement.source_position = token.source_position;
3553 label_statement->label = label;
3557 if(token.type == '}') {
3558 parse_error("label at end of compound statement");
3559 return (statement_t*) label_statement;
3561 label_statement->label_statement = parse_statement();
3564 return (statement_t*) label_statement;
3567 static statement_t *parse_if(void)
3571 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3572 statement->statement.type = STATEMENT_IF;
3573 statement->statement.source_position = token.source_position;
3576 statement->condition = parse_expression();
3579 statement->true_statement = parse_statement();
3580 if(token.type == T_else) {
3582 statement->false_statement = parse_statement();
3585 return (statement_t*) statement;
3588 static statement_t *parse_switch(void)
3592 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3593 statement->statement.type = STATEMENT_SWITCH;
3594 statement->statement.source_position = token.source_position;
3597 statement->expression = parse_expression();
3599 statement->body = parse_statement();
3601 return (statement_t*) statement;
3604 static statement_t *parse_while(void)
3608 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3609 statement->statement.type = STATEMENT_WHILE;
3610 statement->statement.source_position = token.source_position;
3613 statement->condition = parse_expression();
3615 statement->body = parse_statement();
3617 return (statement_t*) statement;
3620 static statement_t *parse_do(void)
3624 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3625 statement->statement.type = STATEMENT_DO_WHILE;
3626 statement->statement.source_position = token.source_position;
3628 statement->body = parse_statement();
3631 statement->condition = parse_expression();
3635 return (statement_t*) statement;
3638 static statement_t *parse_for(void)
3642 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3643 statement->statement.type = STATEMENT_FOR;
3644 statement->statement.source_position = token.source_position;
3648 int top = environment_top();
3649 context_t *last_context = context;
3650 set_context(&statement->context);
3652 if(token.type != ';') {
3653 if(is_declaration_specifier(&token, false)) {
3654 parse_declaration();
3656 statement->initialisation = parse_expression();
3663 if(token.type != ';') {
3664 statement->condition = parse_expression();
3667 if(token.type != ')') {
3668 statement->step = parse_expression();
3671 statement->body = parse_statement();
3673 assert(context == &statement->context);
3674 set_context(last_context);
3675 environment_pop_to(top);
3677 return (statement_t*) statement;
3680 static statement_t *parse_goto(void)
3684 if(token.type != T_IDENTIFIER) {
3685 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
3689 symbol_t *symbol = token.v.symbol;
3692 declaration_t *label = get_label(symbol);
3694 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3696 statement->statement.type = STATEMENT_GOTO;
3697 statement->statement.source_position = token.source_position;
3699 statement->label = label;
3703 return (statement_t*) statement;
3706 static statement_t *parse_continue(void)
3711 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3712 statement->type = STATEMENT_CONTINUE;
3713 statement->source_position = token.source_position;
3718 static statement_t *parse_break(void)
3723 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3724 statement->type = STATEMENT_BREAK;
3725 statement->source_position = token.source_position;
3730 static statement_t *parse_return(void)
3734 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3736 statement->statement.type = STATEMENT_RETURN;
3737 statement->statement.source_position = token.source_position;
3739 assert(current_function->type->type == TYPE_FUNCTION);
3740 function_type_t *function_type = (function_type_t*) current_function->type;
3741 type_t *return_type = function_type->result_type;
3743 expression_t *return_value;
3744 if(token.type != ';') {
3745 return_value = parse_expression();
3747 if(return_type == type_void && return_value->datatype != type_void) {
3748 parse_warning("'return' with a value, in function returning void");
3749 return_value = NULL;
3751 if(return_type != NULL) {
3752 semantic_assign(return_type, &return_value, "'return'");
3756 return_value = NULL;
3757 if(return_type != type_void) {
3758 parse_warning("'return' without value, in function returning "
3762 statement->return_value = return_value;
3766 return (statement_t*) statement;
3769 static statement_t *parse_declaration_statement(void)
3771 declaration_t *before = last_declaration;
3773 declaration_statement_t *statement
3774 = allocate_ast_zero(sizeof(statement[0]));
3775 statement->statement.type = STATEMENT_DECLARATION;
3776 statement->statement.source_position = token.source_position;
3778 declaration_specifiers_t specifiers;
3779 memset(&specifiers, 0, sizeof(specifiers));
3780 parse_declaration_specifiers(&specifiers);
3782 if(token.type == ';') {
3785 parse_init_declarators(&specifiers);
3788 if(before == NULL) {
3789 statement->declarations_begin = context->declarations;
3791 statement->declarations_begin = before->next;
3793 statement->declarations_end = last_declaration;
3795 return (statement_t*) statement;
3798 static statement_t *parse_expression_statement(void)
3800 expression_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3801 statement->statement.type = STATEMENT_EXPRESSION;
3802 statement->statement.source_position = token.source_position;
3804 statement->expression = parse_expression();
3808 return (statement_t*) statement;
3811 static statement_t *parse_statement(void)
3813 statement_t *statement = NULL;
3815 /* declaration or statement */
3816 switch(token.type) {
3818 statement = parse_case_statement();
3822 statement = parse_default_statement();
3826 statement = parse_compound_statement();
3830 statement = parse_if();
3834 statement = parse_switch();
3838 statement = parse_while();
3842 statement = parse_do();
3846 statement = parse_for();
3850 statement = parse_goto();
3854 statement = parse_continue();
3858 statement = parse_break();
3862 statement = parse_return();
3871 if(look_ahead(1)->type == ':') {
3872 statement = parse_label_statement();
3876 if(is_typedef_symbol(token.v.symbol)) {
3877 statement = parse_declaration_statement();
3881 statement = parse_expression_statement();
3884 case T___extension__:
3885 /* this can be a prefix to a declaration or an expression statement */
3886 /* we simply eat it now and parse the rest with tail recursion */
3889 } while(token.type == T___extension__);
3890 statement = parse_statement();
3894 statement = parse_declaration_statement();
3898 statement = parse_expression_statement();
3902 assert(statement == NULL || statement->source_position.input_name != NULL);
3907 static statement_t *parse_compound_statement(void)
3909 compound_statement_t *compound_statement
3910 = allocate_ast_zero(sizeof(compound_statement[0]));
3911 compound_statement->statement.type = STATEMENT_COMPOUND;
3912 compound_statement->statement.source_position = token.source_position;
3916 int top = environment_top();
3917 context_t *last_context = context;
3918 set_context(&compound_statement->context);
3920 statement_t *last_statement = NULL;
3922 while(token.type != '}' && token.type != T_EOF) {
3923 statement_t *statement = parse_statement();
3924 if(statement == NULL)
3927 if(last_statement != NULL) {
3928 last_statement->next = statement;
3930 compound_statement->statements = statement;
3933 while(statement->next != NULL)
3934 statement = statement->next;
3936 last_statement = statement;
3939 if(token.type != '}') {
3940 parser_print_error_prefix_pos(
3941 compound_statement->statement.source_position);
3942 fprintf(stderr, "end of file while looking for closing '}'\n");
3946 assert(context == &compound_statement->context);
3947 set_context(last_context);
3948 environment_pop_to(top);
3950 return (statement_t*) compound_statement;
3953 static translation_unit_t *parse_translation_unit(void)
3955 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
3957 assert(global_context == NULL);
3958 global_context = &unit->context;
3960 assert(context == NULL);
3961 set_context(&unit->context);
3963 while(token.type != T_EOF) {
3964 parse_declaration();
3967 assert(context == &unit->context);
3969 last_declaration = NULL;
3971 assert(global_context == &unit->context);
3972 global_context = NULL;
3977 translation_unit_t *parse(void)
3979 environment_stack = NEW_ARR_F(stack_entry_t, 0);
3980 label_stack = NEW_ARR_F(stack_entry_t, 0);
3981 found_error = false;
3983 type_set_output(stderr);
3984 ast_set_output(stderr);
3986 lookahead_bufpos = 0;
3987 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
3990 translation_unit_t *unit = parse_translation_unit();
3992 DEL_ARR_F(environment_stack);
3993 DEL_ARR_F(label_stack);
4001 void init_parser(void)
4003 init_expression_parsers();
4004 obstack_init(&temp_obst);
4006 type_int = make_atomic_type(ATOMIC_TYPE_INT, 0);
4007 type_uint = make_atomic_type(ATOMIC_TYPE_UINT, 0);
4008 type_long_double = make_atomic_type(ATOMIC_TYPE_LONG_DOUBLE, 0);
4009 type_double = make_atomic_type(ATOMIC_TYPE_DOUBLE, 0);
4010 type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, 0);
4011 type_size_t = make_atomic_type(ATOMIC_TYPE_ULONG, 0);
4012 type_ptrdiff_t = make_atomic_type(ATOMIC_TYPE_LONG, 0);
4013 type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST);
4014 type_void = make_atomic_type(ATOMIC_TYPE_VOID, 0);
4015 type_string = make_pointer_type(type_const_char, 0);
4018 void exit_parser(void)
4020 obstack_free(&temp_obst, NULL);