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 parse_warning(const char *message)
206 parser_print_prefix_pos(token.source_position);
207 fprintf(stderr, "warning: %s\n", message);
210 static void parse_error_expected(const char *message, ...)
215 if(message != NULL) {
216 parser_print_error_prefix();
217 fprintf(stderr, "%s\n", message);
219 parser_print_error_prefix();
220 fputs("Parse error: got ", stderr);
221 print_token(stderr, &token);
222 fputs(", expected ", stderr);
224 va_start(args, message);
225 token_type_t token_type = va_arg(args, token_type_t);
226 while(token_type != 0) {
230 fprintf(stderr, ", ");
232 print_token_type(stderr, token_type);
233 token_type = va_arg(args, token_type_t);
236 fprintf(stderr, "\n");
239 static void type_error(const char *msg, const source_position_t source_position,
242 parser_print_error_prefix_pos(source_position);
243 fprintf(stderr, "%s, but found type ", msg);
249 static void type_error_incompatible(const char *msg,
250 const source_position_t source_position, type_t *type1, type_t *type2)
252 parser_print_error_prefix_pos(source_position);
253 fprintf(stderr, "%s, incompatible types: ", msg);
255 fprintf(stderr, " - ");
257 fprintf(stderr, ")\n");
261 static void eat_block(void)
263 if(token.type == '{')
266 while(token.type != '}') {
267 if(token.type == T_EOF)
269 if(token.type == '{') {
278 static void eat_statement(void)
280 while(token.type != ';') {
281 if(token.type == T_EOF)
283 if(token.type == '}')
285 if(token.type == '{') {
294 static void eat_brace(void)
296 if(token.type == '(')
299 while(token.type != ')') {
300 if(token.type == T_EOF)
302 if(token.type == ')' || token.type == ';' || token.type == '}') {
305 if(token.type == '(') {
309 if(token.type == '{') {
318 #define expect(expected) \
319 if(UNLIKELY(token.type != (expected))) { \
320 parse_error_expected(NULL, (expected), 0); \
326 #define expect_void(expected) \
327 if(UNLIKELY(token.type != (expected))) { \
328 parse_error_expected(NULL, (expected), 0); \
334 static void set_context(context_t *new_context)
336 context = new_context;
338 last_declaration = new_context->declarations;
339 if(last_declaration != NULL) {
340 while(last_declaration->next != NULL) {
341 last_declaration = last_declaration->next;
347 * called when we find a 2nd declarator for an identifier we already have a
350 static bool is_compatible_declaration (declaration_t *declaration,
351 declaration_t *previous)
353 /* TODO: not correct yet */
354 return declaration->type == previous->type;
357 static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespace)
359 declaration_t *declaration = symbol->declaration;
360 for( ; declaration != NULL; declaration = declaration->symbol_next) {
361 if(declaration->namespace == namespace)
368 static const char *get_namespace_prefix(namespace_t namespace)
371 case NAMESPACE_NORMAL:
373 case NAMESPACE_UNION:
375 case NAMESPACE_STRUCT:
379 case NAMESPACE_LABEL:
382 panic("invalid namespace found");
386 * pushs an environment_entry on the environment stack and links the
387 * corresponding symbol to the new entry
389 static declaration_t *stack_push(stack_entry_t **stack_ptr,
390 declaration_t *declaration,
391 context_t *parent_context)
393 symbol_t *symbol = declaration->symbol;
394 namespace_t namespace = declaration->namespace;
396 /* a declaration should be only pushed once */
397 assert(declaration->parent_context == NULL);
398 declaration->parent_context = parent_context;
400 declaration_t *previous_declaration = get_declaration(symbol, namespace);
401 assert(declaration != previous_declaration);
402 if(previous_declaration != NULL
403 && previous_declaration->parent_context == context) {
404 if(!is_compatible_declaration(declaration, previous_declaration)) {
405 parser_print_error_prefix_pos(declaration->source_position);
406 fprintf(stderr, "definition of symbol %s%s with type ",
407 get_namespace_prefix(namespace), symbol->string);
409 print_type(declaration->type);
411 parser_print_error_prefix_pos(
412 previous_declaration->source_position);
413 fprintf(stderr, "is incompatible with previous declaration "
415 print_type(previous_declaration->type);
418 return previous_declaration;
421 /* remember old declaration */
423 entry.symbol = symbol;
424 entry.old_declaration = symbol->declaration;
425 entry.namespace = namespace;
426 ARR_APP1(*stack_ptr, entry);
428 /* replace/add declaration into declaration list of the symbol */
429 if(symbol->declaration == NULL) {
430 symbol->declaration = declaration;
432 declaration_t *iter_last = NULL;
433 declaration_t *iter = symbol->declaration;
434 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
435 /* replace an entry? */
436 if(iter->namespace == namespace) {
437 if(iter_last == NULL) {
438 symbol->declaration = declaration;
440 iter_last->symbol_next = declaration;
442 declaration->symbol_next = iter->symbol_next;
447 assert(iter_last->symbol_next == NULL);
448 iter_last->symbol_next = declaration;
455 static declaration_t *environment_push(declaration_t *declaration)
457 assert(declaration->source_position.input_name != NULL);
458 return stack_push(&environment_stack, declaration, context);
461 static declaration_t *label_push(declaration_t *declaration)
463 return stack_push(&label_stack, declaration, ¤t_function->context);
467 * pops symbols from the environment stack until @p new_top is the top element
469 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
471 stack_entry_t *stack = *stack_ptr;
472 size_t top = ARR_LEN(stack);
475 assert(new_top <= top);
479 for(i = top; i > new_top; --i) {
480 stack_entry_t *entry = & stack[i - 1];
482 declaration_t *old_declaration = entry->old_declaration;
483 symbol_t *symbol = entry->symbol;
484 namespace_t namespace = entry->namespace;
486 /* replace/remove declaration */
487 declaration_t *declaration = symbol->declaration;
488 assert(declaration != NULL);
489 if(declaration->namespace == namespace) {
490 if(old_declaration == NULL) {
491 symbol->declaration = declaration->symbol_next;
493 symbol->declaration = old_declaration;
494 assert(old_declaration->symbol_next ==
495 declaration->symbol_next);
498 for(; declaration != NULL; declaration = declaration->symbol_next) {
499 declaration_t *symbol_next = declaration->symbol_next;
500 if(symbol_next->namespace == namespace) {
501 declaration->symbol_next = old_declaration;
502 assert(old_declaration->symbol_next
503 == symbol_next->symbol_next);
507 assert(declaration != NULL);
511 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
514 static void environment_pop_to(size_t new_top)
516 stack_pop_to(&environment_stack, new_top);
519 static void label_pop_to(size_t new_top)
521 stack_pop_to(&label_stack, new_top);
525 static int get_rank(const type_t *type)
527 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
528 * and esp. footnote 108). However we can't fold constants (yet), so we
529 * can't decide wether unsigned int is possible, while int always works.
530 * (unsigned int would be preferable when possible... for stuff like
531 * struct { enum { ... } bla : 4; } ) */
532 if(type->type == TYPE_ENUM)
533 return ATOMIC_TYPE_INT;
535 assert(type->type == TYPE_ATOMIC);
536 atomic_type_t *atomic_type = (atomic_type_t*) type;
537 atomic_type_type_t atype = atomic_type->atype;
541 static type_t *promote_integer(type_t *type)
543 if(get_rank(type) < ATOMIC_TYPE_INT)
549 static expression_t *create_cast_expression(expression_t *expression,
552 unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
554 cast->expression.type = EXPR_UNARY;
555 cast->type = UNEXPR_CAST;
556 cast->value = expression;
557 cast->expression.datatype = dest_type;
559 return (expression_t*) cast;
562 static expression_t *create_implicit_cast(expression_t *expression,
565 type_t *source_type = expression->datatype;
567 if(source_type == NULL)
570 source_type = skip_typeref(source_type);
571 dest_type = skip_typeref(dest_type);
573 if(source_type == dest_type)
576 if(dest_type->type == TYPE_ATOMIC) {
577 if(source_type->type != TYPE_ATOMIC)
578 panic("casting of non-atomic types not implemented yet");
580 if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
581 type_error_incompatible("can't cast types",
582 expression->source_position,
583 source_type, dest_type);
587 return create_cast_expression(expression, dest_type);
589 if(dest_type->type == TYPE_POINTER) {
590 if(source_type->type == TYPE_POINTER) {
591 if(!pointers_compatible(source_type, dest_type)) {
592 type_error_incompatible("can't implicitely cast types",
593 expression->source_position,
594 source_type, dest_type);
596 return create_cast_expression(expression, dest_type);
601 panic("casting of non-atomic types not implemented yet");
604 static void semantic_assign(type_t *orig_type_left, expression_t **right,
607 type_t *orig_type_right = (*right)->datatype;
609 if(orig_type_right == NULL)
612 type_t *type_left = skip_typeref(orig_type_left);
613 type_t *type_right = skip_typeref(orig_type_right);
615 if(type_left == type_right) {
617 } else if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
618 *right = create_implicit_cast(*right, type_left);
619 } else if(type_left->type == TYPE_POINTER
620 && type_right->type == TYPE_POINTER) {
623 /* TODO: improve error message */
624 parser_print_error_prefix();
625 fprintf(stderr, "incompatible types in %s\n", context);
626 parser_print_error_prefix();
627 print_type(type_left);
628 fputs(" <- ", stderr);
629 print_type(type_right);
635 static expression_t *parse_constant_expression(void)
637 /* start parsing at precedence 7 (conditional expression) */
638 return parse_sub_expression(7);
641 static expression_t *parse_assignment_expression(void)
643 /* start parsing at precedence 2 (assignment expression) */
644 return parse_sub_expression(2);
647 static void parse_compound_type_entries(void);
648 static declaration_t *parse_declarator(storage_class_t storage_class,
649 type_t *type, int may_be_abstract);
650 static declaration_t *record_declaration(declaration_t *declaration);
652 typedef struct declaration_specifiers_t declaration_specifiers_t;
653 struct declaration_specifiers_t {
654 storage_class_t storage_class;
658 static const char *parse_string_literals(void)
660 assert(token.type == T_STRING_LITERAL);
661 const char *result = token.v.string;
665 while(token.type == T_STRING_LITERAL) {
666 result = concat_strings(result, token.v.string);
673 static void parse_attributes(void)
677 case T___attribute__:
685 parse_error("EOF while parsing attribute");
703 if(token.type != T_STRING_LITERAL) {
704 parse_error_expected("while parsing assembler attribute",
709 parse_string_literals();
714 goto attributes_finished;
722 static designator_t *parse_designation(void)
724 if(token.type != '[' && token.type != '.')
727 designator_t *result = NULL;
728 designator_t *last = NULL;
731 designator_t *designator;
734 designator = allocate_ast_zero(sizeof(designator[0]));
736 designator->array_access = parse_constant_expression();
740 designator = allocate_ast_zero(sizeof(designator[0]));
742 if(token.type != T_IDENTIFIER) {
743 parse_error_expected("problem while parsing designator",
747 designator->symbol = token.v.symbol;
755 assert(designator != NULL);
757 last->next = designator;
765 static initializer_t *parse_initializer_list(type_t *type);
767 static initializer_t *parse_initializer(type_t *type)
769 designator_t *designator = parse_designation();
771 initializer_t *result;
772 if(token.type == '{') {
773 result = parse_initializer_list(type);
775 result = allocate_ast_zero(sizeof(result[0]));
776 result->type = INITIALIZER_VALUE;
777 result->v.value = parse_assignment_expression();
780 semantic_assign(type, &result->v.value, "initializer");
783 result->designator = designator;
788 static initializer_t *parse_initializer_list(type_t *type)
795 initializer_t *result = allocate_ast_zero(sizeof(result[0]));
796 result->type = INITIALIZER_LIST;
798 initializer_t *last = NULL;
800 initializer_t *initializer = parse_initializer(NULL);
802 last->next = initializer;
804 result->v.list = initializer;
808 if(token.type == '}')
811 if(token.type != ',') {
812 parse_error_expected("problem while parsing initializer list",
819 if(token.type == '}')
828 static declaration_t *parse_compound_type_specifier(bool is_struct)
836 symbol_t *symbol = NULL;
837 declaration_t *declaration = NULL;
839 if(token.type == T_IDENTIFIER) {
840 symbol = token.v.symbol;
844 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
846 declaration = get_declaration(symbol, NAMESPACE_UNION);
848 } else if(token.type != '{') {
850 parse_error_expected("problem while parsing struct type specifier",
851 T_IDENTIFIER, '{', 0);
853 parse_error_expected("problem while parsing union type specifier",
854 T_IDENTIFIER, '{', 0);
860 if(declaration == NULL) {
861 declaration = allocate_type_zero(sizeof(declaration[0]));
864 declaration->namespace = NAMESPACE_STRUCT;
866 declaration->namespace = NAMESPACE_UNION;
868 declaration->source_position = token.source_position;
869 declaration->symbol = symbol;
872 if(token.type == '{') {
873 if(declaration->init.is_defined) {
874 assert(symbol != NULL);
875 parser_print_error_prefix();
876 fprintf(stderr, "multiple definition of %s %s\n",
877 is_struct ? "struct" : "union", symbol->string);
878 declaration->context.declarations = NULL;
880 record_declaration(declaration);
881 declaration->init.is_defined = true;
883 int top = environment_top();
884 context_t *last_context = context;
885 set_context(& declaration->context);
887 parse_compound_type_entries();
890 assert(context == & declaration->context);
891 set_context(last_context);
892 environment_pop_to(top);
898 static void parse_enum_entries(void)
902 if(token.type == '}') {
904 parse_error("empty enum not allowed");
909 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
911 if(token.type != T_IDENTIFIER) {
912 parse_error_expected("problem while parsing enum entry",
917 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
918 entry->symbol = token.v.symbol;
919 entry->source_position = token.source_position;
922 if(token.type == '=') {
924 entry->init.initializer = parse_initializer(type_int);
927 record_declaration(entry);
929 if(token.type != ',')
932 } while(token.type != '}');
937 static declaration_t *parse_enum_specifier(void)
941 declaration_t *declaration;
944 if(token.type == T_IDENTIFIER) {
945 symbol = token.v.symbol;
948 declaration = get_declaration(symbol, NAMESPACE_ENUM);
949 } else if(token.type != '{') {
950 parse_error_expected("problem while parsing enum type specifier",
951 T_IDENTIFIER, '{', 0);
958 if(declaration == NULL) {
959 declaration = allocate_type_zero(sizeof(declaration[0]));
961 declaration->namespace = NAMESPACE_ENUM;
962 declaration->source_position = token.source_position;
963 declaration->symbol = symbol;
966 if(token.type == '{') {
967 if(declaration->init.is_defined) {
968 parser_print_error_prefix();
969 fprintf(stderr, "multiple definitions of enum %s\n",
972 record_declaration(declaration);
973 declaration->init.is_defined = 1;
975 parse_enum_entries();
983 * if a symbol is a typedef to another type, return true
985 static bool is_typedef_symbol(symbol_t *symbol)
987 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
988 if(declaration == NULL
989 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
995 static type_t *parse_typeof(void)
1003 expression_t *expression = NULL;
1006 switch(token.type) {
1007 case T___extension__:
1008 /* this can be a prefix to a typename or an expression */
1009 /* we simply eat it now. */
1012 } while(token.type == T___extension__);
1016 if(is_typedef_symbol(token.v.symbol)) {
1017 type = parse_typename();
1019 expression = parse_expression();
1020 type = expression->datatype;
1025 type = parse_typename();
1029 expression = parse_expression();
1030 type = expression->datatype;
1036 typeof_type_t *typeof = allocate_type_zero(sizeof(typeof[0]));
1037 typeof->type.type = TYPE_TYPEOF;
1038 typeof->expression = expression;
1039 typeof->typeof_type = type;
1041 return (type_t*) typeof;
1045 SPECIFIER_SIGNED = 1 << 0,
1046 SPECIFIER_UNSIGNED = 1 << 1,
1047 SPECIFIER_LONG = 1 << 2,
1048 SPECIFIER_INT = 1 << 3,
1049 SPECIFIER_DOUBLE = 1 << 4,
1050 SPECIFIER_CHAR = 1 << 5,
1051 SPECIFIER_SHORT = 1 << 6,
1052 SPECIFIER_LONG_LONG = 1 << 7,
1053 SPECIFIER_FLOAT = 1 << 8,
1054 SPECIFIER_BOOL = 1 << 9,
1055 SPECIFIER_VOID = 1 << 10,
1056 #ifdef PROVIDE_COMPLEX
1057 SPECIFIER_COMPLEX = 1 << 11,
1059 #ifdef PROVIDE_IMAGINARY
1060 SPECIFIER_IMAGINARY = 1 << 12,
1064 static type_t *create_builtin_type(symbol_t *symbol)
1066 builtin_type_t *type = allocate_type_zero(sizeof(type[0]));
1067 type->type.type = TYPE_BUILTIN;
1068 type->symbol = symbol;
1070 type->real_type = type_int;
1072 return (type_t*) type;
1075 static type_t *get_typedef_type(symbol_t *symbol)
1077 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1078 if(declaration == NULL
1079 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1082 typedef_type_t *typedef_type = allocate_type_zero(sizeof(typedef_type[0]));
1083 typedef_type->type.type = TYPE_TYPEDEF;
1084 typedef_type->declaration = declaration;
1086 return (type_t*) typedef_type;
1089 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1091 type_t *type = NULL;
1092 unsigned type_qualifiers = 0;
1093 unsigned type_specifiers = 0;
1097 switch(token.type) {
1100 #define MATCH_STORAGE_CLASS(token, class) \
1102 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1103 parse_error("multiple storage classes in declaration " \
1106 specifiers->storage_class = class; \
1110 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1111 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1112 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1113 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1114 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1116 /* type qualifiers */
1117 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1119 type_qualifiers |= qualifier; \
1123 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1124 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1125 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1126 MATCH_TYPE_QUALIFIER(T_inline, TYPE_QUALIFIER_INLINE);
1128 case T___extension__:
1133 /* type specifiers */
1134 #define MATCH_SPECIFIER(token, specifier, name) \
1137 if(type_specifiers & specifier) { \
1138 parse_error("multiple " name " type specifiers given"); \
1140 type_specifiers |= specifier; \
1144 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1145 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1146 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1147 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1148 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1149 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1150 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1151 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1152 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1153 #ifdef PROVIDE_COMPLEX
1154 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1156 #ifdef PROVIDE_IMAGINARY
1157 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1161 if(type_specifiers & SPECIFIER_LONG_LONG) {
1162 parse_error("multiple type specifiers given");
1163 } else if(type_specifiers & SPECIFIER_LONG) {
1164 type_specifiers |= SPECIFIER_LONG_LONG;
1166 type_specifiers |= SPECIFIER_LONG;
1170 /* TODO: if type != NULL for the following rules should issue
1173 compound_type_t *compound_type
1174 = allocate_type_zero(sizeof(compound_type[0]));
1175 compound_type->type.type = TYPE_COMPOUND_STRUCT;
1176 compound_type->declaration = parse_compound_type_specifier(true);
1178 type = (type_t*) compound_type;
1182 compound_type_t *compound_type
1183 = allocate_type_zero(sizeof(compound_type[0]));
1184 compound_type->type.type = TYPE_COMPOUND_UNION;
1185 compound_type->declaration = parse_compound_type_specifier(false);
1187 type = (type_t*) compound_type;
1191 enum_type_t *enum_type = allocate_type_zero(sizeof(enum_type[0]));
1192 enum_type->type.type = TYPE_ENUM;
1193 enum_type->declaration = parse_enum_specifier();
1195 type = (type_t*) enum_type;
1199 type = parse_typeof();
1201 case T___builtin_va_list:
1202 type = create_builtin_type(token.v.symbol);
1206 case T___attribute__:
1211 case T_IDENTIFIER: {
1212 type_t *typedef_type = get_typedef_type(token.v.symbol);
1214 if(typedef_type == NULL)
1215 goto finish_specifiers;
1218 type = typedef_type;
1222 /* function specifier */
1224 goto finish_specifiers;
1231 atomic_type_type_t atomic_type;
1233 /* match valid basic types */
1234 switch(type_specifiers) {
1235 case SPECIFIER_VOID:
1236 atomic_type = ATOMIC_TYPE_VOID;
1238 case SPECIFIER_CHAR:
1239 atomic_type = ATOMIC_TYPE_CHAR;
1241 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1242 atomic_type = ATOMIC_TYPE_SCHAR;
1244 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1245 atomic_type = ATOMIC_TYPE_UCHAR;
1247 case SPECIFIER_SHORT:
1248 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1249 case SPECIFIER_SHORT | SPECIFIER_INT:
1250 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1251 atomic_type = ATOMIC_TYPE_SHORT;
1253 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1254 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1255 atomic_type = ATOMIC_TYPE_USHORT;
1258 case SPECIFIER_SIGNED:
1259 case SPECIFIER_SIGNED | SPECIFIER_INT:
1260 atomic_type = ATOMIC_TYPE_INT;
1262 case SPECIFIER_UNSIGNED:
1263 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1264 atomic_type = ATOMIC_TYPE_UINT;
1266 case SPECIFIER_LONG:
1267 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1268 case SPECIFIER_LONG | SPECIFIER_INT:
1269 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1270 atomic_type = ATOMIC_TYPE_LONG;
1272 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1273 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1274 atomic_type = ATOMIC_TYPE_ULONG;
1276 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1277 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1278 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1279 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1281 atomic_type = ATOMIC_TYPE_LONGLONG;
1283 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1284 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1286 atomic_type = ATOMIC_TYPE_ULONGLONG;
1288 case SPECIFIER_FLOAT:
1289 atomic_type = ATOMIC_TYPE_FLOAT;
1291 case SPECIFIER_DOUBLE:
1292 atomic_type = ATOMIC_TYPE_DOUBLE;
1294 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1295 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1297 case SPECIFIER_BOOL:
1298 atomic_type = ATOMIC_TYPE_BOOL;
1300 #ifdef PROVIDE_COMPLEX
1301 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1302 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1304 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1305 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1307 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1308 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1311 #ifdef PROVIDE_IMAGINARY
1312 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1313 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1315 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1316 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1318 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1319 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1323 /* invalid specifier combination, give an error message */
1324 if(type_specifiers == 0) {
1326 parse_warning("no type specifiers in declaration (using int)");
1327 atomic_type = ATOMIC_TYPE_INT;
1330 parse_error("no type specifiers given in declaration");
1332 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1333 (type_specifiers & SPECIFIER_UNSIGNED)) {
1334 parse_error("signed and unsigned specifiers gives");
1335 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1336 parse_error("only integer types can be signed or unsigned");
1338 parse_error("multiple datatypes in declaration");
1340 atomic_type = ATOMIC_TYPE_INVALID;
1343 atomic_type_t *atype = allocate_type_zero(sizeof(atype[0]));
1344 atype->type.type = TYPE_ATOMIC;
1345 atype->atype = atomic_type;
1348 type = (type_t*) atype;
1350 if(type_specifiers != 0) {
1351 parse_error("multiple datatypes in declaration");
1355 type->qualifiers = type_qualifiers;
1357 type_t *result = typehash_insert(type);
1358 if(newtype && result != (type_t*) type) {
1362 specifiers->type = result;
1365 static type_qualifier_t parse_type_qualifiers(void)
1367 type_qualifier_t type_qualifiers = 0;
1370 switch(token.type) {
1371 /* type qualifiers */
1372 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1373 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1374 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1375 MATCH_TYPE_QUALIFIER(T_inline, TYPE_QUALIFIER_INLINE);
1378 return type_qualifiers;
1383 static void parse_identifier_list(void)
1386 if(token.type != T_IDENTIFIER) {
1387 parse_error_expected("problem while parsing parameter identifier "
1388 "list", T_IDENTIFIER, 0);
1392 if(token.type != ',')
1398 static declaration_t *parse_parameter(void)
1400 declaration_specifiers_t specifiers;
1401 memset(&specifiers, 0, sizeof(specifiers));
1403 parse_declaration_specifiers(&specifiers);
1405 declaration_t *declaration = parse_declarator(specifiers.storage_class,
1406 specifiers.type, 1);
1408 /* TODO check declaration constraints for parameters */
1409 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1410 parse_error("typedef not allowed in parameter list");
1416 static declaration_t *parse_parameters(function_type_t *type)
1418 if(token.type == T_IDENTIFIER) {
1419 symbol_t *symbol = token.v.symbol;
1420 if(!is_typedef_symbol(symbol)) {
1422 parse_identifier_list();
1427 if(token.type == ')') {
1428 type->unspecified_parameters = 1;
1431 if(token.type == T_void && look_ahead(1)->type == ')') {
1436 declaration_t *declarations = NULL;
1437 declaration_t *declaration;
1438 declaration_t *last_declaration = NULL;
1439 function_parameter_t *parameter;
1440 function_parameter_t *last_parameter = NULL;
1443 switch(token.type) {
1447 return declarations;
1450 case T___extension__:
1452 declaration = parse_parameter();
1454 parameter = allocate_type_zero(sizeof(parameter[0]));
1455 parameter->type = declaration->type;
1457 if(last_parameter != NULL) {
1458 last_declaration->next = declaration;
1459 last_parameter->next = parameter;
1461 type->parameters = parameter;
1462 declarations = declaration;
1464 last_parameter = parameter;
1465 last_declaration = declaration;
1469 return declarations;
1471 if(token.type != ',')
1472 return declarations;
1481 } construct_type_type_t;
1483 typedef struct construct_type_t construct_type_t;
1484 struct construct_type_t {
1485 construct_type_type_t type;
1486 construct_type_t *next;
1489 typedef struct parsed_pointer_t parsed_pointer_t;
1490 struct parsed_pointer_t {
1491 construct_type_t construct_type;
1492 type_qualifier_t type_qualifiers;
1495 typedef struct construct_function_type_t construct_function_type_t;
1496 struct construct_function_type_t {
1497 construct_type_t construct_type;
1498 function_type_t *function_type;
1501 typedef struct parsed_array_t parsed_array_t;
1502 struct parsed_array_t {
1503 construct_type_t construct_type;
1504 type_qualifier_t type_qualifiers;
1510 typedef struct construct_base_type_t construct_base_type_t;
1511 struct construct_base_type_t {
1512 construct_type_t construct_type;
1516 static construct_type_t *parse_pointer_declarator(void)
1520 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
1521 memset(pointer, 0, sizeof(pointer[0]));
1522 pointer->type_qualifiers = parse_type_qualifiers();
1524 return (construct_type_t*) pointer;
1527 static construct_type_t *parse_array_declarator(void)
1531 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
1532 memset(array, 0, sizeof(array[0]));
1534 if(token.type == T_static) {
1535 array->is_static = true;
1539 type_qualifier_t type_qualifiers = parse_type_qualifiers();
1540 if(type_qualifiers != 0) {
1541 if(token.type == T_static) {
1542 array->is_static = true;
1546 array->type_qualifiers = type_qualifiers;
1548 if(token.type == '*' && look_ahead(1)->type == ']') {
1549 array->is_variable = true;
1551 } else if(token.type != ']') {
1552 array->size = parse_assignment_expression();
1557 return (construct_type_t*) array;
1560 static construct_type_t *parse_function_declarator(declaration_t *declaration)
1564 function_type_t *type = allocate_type_zero(sizeof(type[0]));
1565 type->type.type = TYPE_FUNCTION;
1567 declaration_t *parameters = parse_parameters(type);
1568 if(declaration != NULL) {
1569 declaration->context.declarations = parameters;
1572 construct_function_type_t *construct_function_type =
1573 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
1574 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
1575 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
1576 construct_function_type->function_type = type;
1580 return (construct_type_t*) construct_function_type;
1583 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
1584 int may_be_abstract)
1586 construct_type_t *result = NULL;
1587 construct_type_t *last = NULL;
1589 while(token.type == '*') {
1590 construct_type_t *type = parse_pointer_declarator();
1599 /* TODO: find out if this is correct */
1602 construct_type_t *inner_types = NULL;
1604 switch(token.type) {
1606 if(declaration == NULL) {
1607 parse_error("no identifier expected in typename");
1609 declaration->symbol = token.v.symbol;
1610 declaration->source_position = token.source_position;
1616 inner_types = parse_inner_declarator(declaration, may_be_abstract);
1622 parse_error_expected("problem while parsing declarator", T_IDENTIFIER,
1627 construct_type_t *type;
1628 switch(token.type) {
1630 type = parse_function_declarator(declaration);
1633 type = parse_array_declarator();
1636 goto declarator_finished;
1647 declarator_finished:
1650 if(inner_types != NULL) {
1652 last->next = inner_types;
1654 result = inner_types;
1662 static type_t *construct_declarator_type(construct_type_t *construct_list,
1665 construct_type_t *iter = construct_list;
1666 for( ; iter != NULL; iter = iter->next) {
1667 parsed_pointer_t *parsed_pointer;
1668 parsed_array_t *parsed_array;
1669 construct_function_type_t *construct_function_type;
1670 function_type_t *function_type;
1671 pointer_type_t *pointer_type;
1672 array_type_t *array_type;
1674 switch(iter->type) {
1675 case CONSTRUCT_FUNCTION:
1676 construct_function_type = (construct_function_type_t*) iter;
1677 function_type = construct_function_type->function_type;
1679 function_type->result_type = type;
1680 type = (type_t*) function_type;
1683 case CONSTRUCT_POINTER:
1684 parsed_pointer = (parsed_pointer_t*) iter;
1685 pointer_type = allocate_type_zero(sizeof(pointer_type[0]));
1687 pointer_type->type.type = TYPE_POINTER;
1688 pointer_type->points_to = type;
1689 pointer_type->type.qualifiers = parsed_pointer->type_qualifiers;
1690 type = (type_t*) pointer_type;
1693 case CONSTRUCT_ARRAY:
1694 parsed_array = (parsed_array_t*) iter;
1695 array_type = allocate_type_zero(sizeof(array_type[0]));
1697 array_type->type.type = TYPE_ARRAY;
1698 array_type->element_type = type;
1699 array_type->type.qualifiers = parsed_array->type_qualifiers;
1700 array_type->is_static = parsed_array->is_static;
1701 array_type->is_variable = parsed_array->is_variable;
1702 array_type->size = parsed_array->size;
1703 type = (type_t*) array_type;
1707 type_t *hashed_type = typehash_insert((type_t*) type);
1708 if(hashed_type != type) {
1717 static declaration_t *parse_declarator(storage_class_t storage_class,
1718 type_t *type, int may_be_abstract)
1720 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1721 declaration->storage_class = storage_class;
1723 construct_type_t *construct_type
1724 = parse_inner_declarator(declaration, may_be_abstract);
1725 declaration->type = construct_declarator_type(construct_type, type);
1727 if(construct_type != NULL) {
1728 obstack_free(&temp_obst, construct_type);
1734 static type_t *parse_abstract_declarator(type_t *base_type)
1736 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
1738 type_t *result = construct_declarator_type(construct_type, base_type);
1739 if(construct_type != NULL) {
1740 obstack_free(&temp_obst, construct_type);
1746 static declaration_t *record_declaration(declaration_t *declaration)
1748 assert(context != NULL);
1750 symbol_t *symbol = declaration->symbol;
1751 if(symbol != NULL) {
1752 declaration_t *alias = environment_push(declaration);
1753 if(alias != declaration)
1756 declaration->parent_context = context;
1759 if(last_declaration != NULL) {
1760 last_declaration->next = declaration;
1762 context->declarations = declaration;
1764 last_declaration = declaration;
1769 static void parser_error_multiple_definition(declaration_t *previous,
1770 declaration_t *declaration)
1772 parser_print_error_prefix_pos(declaration->source_position);
1773 fprintf(stderr, "multiple definition of symbol '%s'\n",
1774 declaration->symbol->string);
1775 parser_print_error_prefix_pos(previous->source_position);
1776 fprintf(stderr, "this is the location of the previous "
1781 static void parse_init_declarators(const declaration_specifiers_t *specifiers)
1784 declaration_t *ndeclaration
1785 = parse_declarator(specifiers->storage_class, specifiers->type, 0);
1787 declaration_t *declaration = record_declaration(ndeclaration);
1788 if(token.type == '=') {
1791 /* TODO: check that this is an allowed type (no function type) */
1793 if(declaration->init.initializer != NULL) {
1794 parser_error_multiple_definition(declaration, ndeclaration);
1797 ndeclaration->init.initializer = parse_initializer(declaration->type);
1798 } else if(token.type == '{') {
1799 if(declaration->type->type != TYPE_FUNCTION) {
1800 parser_print_error_prefix();
1801 fprintf(stderr, "Declarator ");
1802 print_type_ext(declaration->type, declaration->symbol, NULL);
1803 fprintf(stderr, " has a body but is not a function type.\n");
1808 if(declaration->init.statement != NULL) {
1809 parser_error_multiple_definition(declaration, ndeclaration);
1811 if(ndeclaration != declaration) {
1812 memcpy(&declaration->context, &ndeclaration->context,
1813 sizeof(declaration->context));
1816 int top = environment_top();
1817 context_t *last_context = context;
1818 set_context(&declaration->context);
1820 /* push function parameters */
1821 declaration_t *parameter = declaration->context.declarations;
1822 for( ; parameter != NULL; parameter = parameter->next) {
1823 environment_push(parameter);
1826 int label_stack_top = label_top();
1827 declaration_t *old_current_function = current_function;
1828 current_function = declaration;
1830 statement_t *statement = parse_compound_statement();
1832 assert(current_function == declaration);
1833 current_function = old_current_function;
1834 label_pop_to(label_stack_top);
1836 assert(context == &declaration->context);
1837 set_context(last_context);
1838 environment_pop_to(top);
1840 declaration->init.statement = statement;
1844 if(token.type != ',')
1851 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
1854 if(token.type == ':') {
1856 parse_constant_expression();
1857 /* TODO (bitfields) */
1859 declaration_t *declaration
1860 = parse_declarator(specifiers->storage_class,
1861 specifiers->type, 1);
1863 /* TODO: check constraints for struct declarations */
1864 /* TODO: check for doubled fields */
1865 record_declaration(declaration);
1867 if(token.type == ':') {
1869 parse_constant_expression();
1870 /* TODO (bitfields) */
1874 if(token.type != ',')
1881 static void parse_compound_type_entries(void)
1885 while(token.type != '}' && token.type != T_EOF) {
1886 declaration_specifiers_t specifiers;
1887 memset(&specifiers, 0, sizeof(specifiers));
1888 parse_declaration_specifiers(&specifiers);
1890 parse_struct_declarators(&specifiers);
1892 if(token.type == T_EOF) {
1893 parse_error("unexpected error while parsing struct");
1898 static void parse_declaration(void)
1900 source_position_t source_position = token.source_position;
1902 declaration_specifiers_t specifiers;
1903 memset(&specifiers, 0, sizeof(specifiers));
1904 parse_declaration_specifiers(&specifiers);
1906 if(token.type == ';') {
1909 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1911 declaration->type = specifiers.type;
1912 declaration->storage_class = specifiers.storage_class;
1913 declaration->source_position = source_position;
1914 record_declaration(declaration);
1917 parse_init_declarators(&specifiers);
1920 static type_t *parse_typename(void)
1922 declaration_specifiers_t specifiers;
1923 memset(&specifiers, 0, sizeof(specifiers));
1924 parse_declaration_specifiers(&specifiers);
1925 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
1926 /* TODO: improve error message, user does probably not know what a
1927 * storage class is...
1929 parse_error("typename may not have a storage class");
1932 type_t *result = parse_abstract_declarator(specifiers.type);
1940 typedef expression_t* (*parse_expression_function) (unsigned precedence);
1941 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
1942 expression_t *left);
1944 typedef struct expression_parser_function_t expression_parser_function_t;
1945 struct expression_parser_function_t {
1946 unsigned precedence;
1947 parse_expression_function parser;
1948 unsigned infix_precedence;
1949 parse_expression_infix_function infix_parser;
1952 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
1954 static expression_t *expected_expression_error(void)
1956 parser_print_error_prefix();
1957 fprintf(stderr, "expected expression, got token ");
1958 print_token(stderr, & token);
1959 fprintf(stderr, "\n");
1961 expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
1962 expression->type = EXPR_INVALID;
1968 static expression_t *parse_string_const(void)
1970 string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
1972 cnst->expression.type = EXPR_STRING_LITERAL;
1973 cnst->expression.datatype = type_string;
1974 cnst->value = parse_string_literals();
1976 return (expression_t*) cnst;
1979 static expression_t *parse_int_const(void)
1981 const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
1983 cnst->expression.type = EXPR_CONST;
1984 cnst->expression.datatype = type_int;
1985 cnst->v.int_value = token.v.intvalue;
1989 return (expression_t*) cnst;
1992 static expression_t *parse_float_const(void)
1994 const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
1996 cnst->expression.type = EXPR_CONST;
1997 cnst->expression.datatype = type_double;
1998 cnst->v.float_value = token.v.floatvalue;
2002 return (expression_t*) cnst;
2005 static declaration_t *create_implicit_function(symbol_t *symbol,
2006 const source_position_t source_position)
2008 function_type_t *function_type
2009 = allocate_type_zero(sizeof(function_type[0]));
2011 function_type->type.type = TYPE_FUNCTION;
2012 function_type->result_type = type_int;
2013 function_type->unspecified_parameters = true;
2015 type_t *type = typehash_insert((type_t*) function_type);
2016 if(type != (type_t*) function_type) {
2017 free_type(function_type);
2020 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2022 declaration->storage_class = STORAGE_CLASS_EXTERN;
2023 declaration->type = type;
2024 declaration->symbol = symbol;
2025 declaration->source_position = source_position;
2027 /* prepend the implicit definition to the global context
2028 * this is safe since the symbol wasn't declared as anything else yet
2030 assert(symbol->declaration == NULL);
2032 context_t *last_context = context;
2033 context = global_context;
2035 environment_push(declaration);
2036 declaration->next = context->declarations;
2037 context->declarations = declaration;
2039 context = last_context;
2044 static expression_t *parse_reference(void)
2046 reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
2048 ref->expression.type = EXPR_REFERENCE;
2049 ref->symbol = token.v.symbol;
2051 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
2053 source_position_t source_position = token.source_position;
2056 if(declaration == NULL) {
2058 /* an implicitely defined function */
2059 if(token.type == '(') {
2060 parser_print_prefix_pos(token.source_position);
2061 fprintf(stderr, "warning: implicit declaration of function '%s'\n",
2062 ref->symbol->string);
2064 declaration = create_implicit_function(ref->symbol,
2069 parser_print_error_prefix();
2070 fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string);
2071 return (expression_t*) ref;
2075 ref->declaration = declaration;
2076 ref->expression.datatype = declaration->type;
2078 return (expression_t*) ref;
2081 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
2085 /* TODO check if explicit cast is allowed and issue warnings/errors */
2088 static expression_t *parse_cast(void)
2090 unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
2092 cast->expression.type = EXPR_UNARY;
2093 cast->type = UNEXPR_CAST;
2094 cast->expression.source_position = token.source_position;
2096 type_t *type = parse_typename();
2099 expression_t *value = parse_sub_expression(20);
2101 check_cast_allowed(value, type);
2103 cast->expression.datatype = type;
2104 cast->value = value;
2106 return (expression_t*) cast;
2109 static expression_t *parse_statement_expression(void)
2111 statement_expression_t *expression
2112 = allocate_ast_zero(sizeof(expression[0]));
2113 expression->expression.type = EXPR_STATEMENT;
2114 expression->statement = parse_compound_statement();
2116 /* find last statement and use it's type */
2117 const statement_t *last_statement = NULL;
2118 const statement_t *statement = expression->statement;
2119 for( ; statement != NULL; statement = statement->next) {
2120 last_statement = statement;
2123 if(last_statement->type == STATEMENT_EXPRESSION) {
2124 const expression_statement_t *expression_statement =
2125 (const expression_statement_t*) last_statement;
2126 expression->expression.datatype
2127 = expression_statement->expression->datatype;
2129 expression->expression.datatype = type_void;
2134 return (expression_t*) expression;
2137 static expression_t *parse_brace_expression(void)
2141 switch(token.type) {
2143 /* gcc extension: a stement expression */
2144 return parse_statement_expression();
2148 return parse_cast();
2150 if(is_typedef_symbol(token.v.symbol)) {
2151 return parse_cast();
2155 expression_t *result = parse_expression();
2161 static expression_t *parse_function_keyword(void)
2163 eat(T___FUNCTION__);
2166 string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
2167 expression->expression.type = EXPR_FUNCTION;
2168 expression->expression.datatype = type_string;
2169 expression->value = "TODO: FUNCTION";
2171 return (expression_t*) expression;
2174 static expression_t *parse_pretty_function_keyword(void)
2176 eat(T___PRETTY_FUNCTION__);
2179 string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
2180 expression->expression.type = EXPR_PRETTY_FUNCTION;
2181 expression->expression.datatype = type_string;
2182 expression->value = "TODO: PRETTY FUNCTION";
2184 return (expression_t*) expression;
2187 static designator_t *parse_designator(void)
2189 designator_t *result = allocate_ast_zero(sizeof(result[0]));
2191 if(token.type != T_IDENTIFIER) {
2192 parse_error_expected("problem while parsing member designator",
2197 result->symbol = token.v.symbol;
2200 designator_t *last_designator = result;
2202 if(token.type == '.') {
2204 if(token.type != T_IDENTIFIER) {
2205 parse_error_expected("problem while parsing member designator",
2210 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
2211 designator->symbol = token.v.symbol;
2214 last_designator->next = designator;
2215 last_designator = designator;
2218 if(token.type == '[') {
2220 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
2221 designator->array_access = parse_expression();
2222 if(designator->array_access == NULL) {
2228 last_designator->next = designator;
2229 last_designator = designator;
2238 static expression_t *parse_offsetof(void)
2240 eat(T___builtin_offsetof);
2242 offsetof_expression_t *expression
2243 = allocate_ast_zero(sizeof(expression[0]));
2244 expression->expression.type = EXPR_OFFSETOF;
2245 expression->expression.datatype = type_size_t;
2248 expression->type = parse_typename();
2250 expression->designator = parse_designator();
2253 return (expression_t*) expression;
2256 static expression_t *parse_va_arg(void)
2258 eat(T___builtin_va_arg);
2260 va_arg_expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
2261 expression->expression.type = EXPR_VA_ARG;
2264 expression->arg = parse_assignment_expression();
2266 expression->expression.datatype = parse_typename();
2269 return (expression_t*) expression;
2272 static expression_t *parse_builtin_symbol(void)
2274 builtin_symbol_expression_t *expression
2275 = allocate_ast_zero(sizeof(expression[0]));
2276 expression->expression.type = EXPR_BUILTIN_SYMBOL;
2278 /* TODO: set datatype */
2280 expression->symbol = token.v.symbol;
2284 return (expression_t*) expression;
2287 static expression_t *parse_primary_expression(void)
2289 switch(token.type) {
2291 return parse_int_const();
2292 case T_FLOATINGPOINT:
2293 return parse_float_const();
2294 case T_STRING_LITERAL:
2295 return parse_string_const();
2297 return parse_reference();
2298 case T___FUNCTION__:
2299 return parse_function_keyword();
2300 case T___PRETTY_FUNCTION__:
2301 return parse_pretty_function_keyword();
2302 case T___builtin_offsetof:
2303 return parse_offsetof();
2304 case T___builtin_va_arg:
2305 return parse_va_arg();
2306 case T___builtin_expect:
2307 case T___builtin_va_start:
2308 case T___builtin_va_end:
2309 return parse_builtin_symbol();
2312 return parse_brace_expression();
2315 parser_print_error_prefix();
2316 fprintf(stderr, "unexpected token ");
2317 print_token(stderr, &token);
2318 fprintf(stderr, "\n");
2321 expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
2322 expression->type = EXPR_INVALID;
2323 expression->datatype = type_void;
2328 static expression_t *parse_array_expression(unsigned precedence,
2329 expression_t *array_ref)
2335 array_access_expression_t *array_access
2336 = allocate_ast_zero(sizeof(array_access[0]));
2338 array_access->expression.type = EXPR_ARRAY_ACCESS;
2339 array_access->array_ref = array_ref;
2340 array_access->index = parse_expression();
2342 type_t *array_type = array_ref->datatype;
2343 if(array_type != NULL) {
2344 if(array_type->type == TYPE_POINTER) {
2345 pointer_type_t *pointer = (pointer_type_t*) array_type;
2346 array_access->expression.datatype = pointer->points_to;
2348 parser_print_error_prefix();
2349 fprintf(stderr, "array access on object with non-pointer type ");
2350 print_type(array_type);
2351 fprintf(stderr, "\n");
2355 if(token.type != ']') {
2356 parse_error_expected("Problem while parsing array access", ']', 0);
2357 return (expression_t*) array_access;
2361 return (expression_t*) array_access;
2364 static bool is_declaration_specifier(const token_t *token,
2365 bool only_type_specifiers)
2367 switch(token->type) {
2371 return is_typedef_symbol(token->v.symbol);
2374 if(only_type_specifiers)
2383 static expression_t *parse_sizeof(unsigned precedence)
2387 sizeof_expression_t *sizeof_expression
2388 = allocate_ast_zero(sizeof(sizeof_expression[0]));
2389 sizeof_expression->expression.type = EXPR_SIZEOF;
2390 sizeof_expression->expression.datatype = type_size_t;
2392 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
2394 sizeof_expression->type = parse_typename();
2397 expression_t *expression = parse_sub_expression(precedence);
2398 sizeof_expression->type = expression->datatype;
2399 sizeof_expression->size_expression = expression;
2402 return (expression_t*) sizeof_expression;
2405 static expression_t *parse_select_expression(unsigned precedence,
2406 expression_t *compound)
2410 assert(token.type == '.' || token.type == T_MINUSGREATER);
2413 select_expression_t *select = allocate_ast_zero(sizeof(select[0]));
2415 select->expression.type = EXPR_SELECT;
2416 select->compound = compound;
2418 /* TODO: datatype */
2420 if(token.type != T_IDENTIFIER) {
2421 parse_error_expected("Problem while parsing select", T_IDENTIFIER, 0);
2422 return (expression_t*) select;
2424 select->symbol = token.v.symbol;
2427 return (expression_t*) select;
2430 static expression_t *parse_call_expression(unsigned precedence,
2431 expression_t *expression)
2434 call_expression_t *call = allocate_ast_zero(sizeof(call[0]));
2435 call->expression.type = EXPR_CALL;
2436 call->function = expression;
2438 function_type_t *function_type;
2439 type_t *type = expression->datatype;
2440 if(type->type != TYPE_FUNCTION) {
2441 /* TODO calling pointers to functions is ok */
2442 parser_print_error_prefix();
2443 fputs("called object '", stderr);
2444 print_expression(expression);
2445 fputs("' (type ", stderr);
2447 fputs("is not a function\n", stderr);
2449 function_type = NULL;
2450 call->expression.datatype = NULL;
2452 function_type = (function_type_t*) type;
2453 call->expression.datatype = function_type->result_type;
2456 /* parse arguments */
2459 if(token.type != ')') {
2460 call_argument_t *last_argument = NULL;
2463 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
2465 argument->expression = parse_assignment_expression();
2466 if(last_argument == NULL) {
2467 call->arguments = argument;
2469 last_argument->next = argument;
2471 last_argument = argument;
2473 if(token.type != ',')
2480 if(function_type != NULL) {
2481 function_parameter_t *parameter = function_type->parameters;
2482 call_argument_t *argument = call->arguments;
2483 for( ; parameter != NULL && argument != NULL;
2484 parameter = parameter->next, argument = argument->next) {
2485 type_t *expected_type = parameter->type;
2486 /* TODO report context in error messages */
2487 argument->expression = create_implicit_cast(argument->expression,
2490 /* too few parameters */
2491 if(parameter != NULL) {
2492 parser_print_error_prefix();
2493 fprintf(stderr, "too few arguments to function '");
2494 print_expression(expression);
2495 fprintf(stderr, "'\n");
2496 } else if(argument != NULL) {
2497 /* too many parameters */
2498 if(!function_type->variadic
2499 && !function_type->unspecified_parameters) {
2500 parser_print_error_prefix();
2501 fprintf(stderr, "too many arguments to function '");
2502 print_expression(expression);
2503 fprintf(stderr, "'\n");
2505 /* do default promotion */
2506 for( ; argument != NULL; argument = argument->next) {
2507 type_t *type = argument->expression->datatype;
2512 if(is_type_integer(type)) {
2513 type = promote_integer(type);
2514 } else if(type == type_float) {
2517 argument->expression
2518 = create_implicit_cast(argument->expression, type);
2524 return (expression_t*) call;
2527 static type_t *get_type_after_conversion(const type_t *type1,
2528 const type_t *type2)
2532 return (type_t*) type1;
2535 static expression_t *parse_conditional_expression(unsigned precedence,
2536 expression_t *expression)
2540 conditional_expression_t *conditional
2541 = allocate_ast_zero(sizeof(conditional[0]));
2542 conditional->expression.type = EXPR_CONDITIONAL;
2543 conditional->condition = expression;
2546 type_t *condition_type = conditional->condition->datatype;
2547 if(condition_type != NULL) {
2548 if(!is_type_scalar(condition_type)) {
2549 type_error("expected a scalar type", expression->source_position,
2554 conditional->true_expression = parse_expression();
2556 conditional->false_expression = parse_sub_expression(precedence);
2558 type_t *true_type = conditional->true_expression->datatype;
2559 if(true_type == NULL)
2560 return (expression_t*) conditional;
2561 type_t *false_type = conditional->false_expression->datatype;
2562 if(false_type == NULL)
2563 return (expression_t*) conditional;
2566 if(true_type == false_type) {
2567 conditional->expression.datatype = true_type;
2568 } else if(is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
2569 type_t *result = get_type_after_conversion(true_type, false_type);
2570 /* TODO: create implicit convs if necessary */
2571 conditional->expression.datatype = result;
2572 } else if(true_type->type == TYPE_POINTER &&
2573 false_type->type == TYPE_POINTER &&
2574 true /* TODO compatible points_to types */) {
2576 } else if(/* (is_null_ptr_const(true_type) && false_type->type == TYPE_POINTER)
2577 || (is_null_ptr_const(false_type) &&
2578 true_type->type == TYPE_POINTER) TODO*/ false) {
2580 } else if(/* 1 is pointer to object type, other is void* */ false) {
2583 type_error_incompatible("problem while parsing conditional",
2584 expression->source_position, true_type,
2588 return (expression_t*) conditional;
2591 static expression_t *parse_extension(unsigned precedence)
2593 eat(T___extension__);
2595 /* TODO enable extensions */
2597 return parse_sub_expression(precedence);
2600 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
2602 type_t *orig_type = expression->value->datatype;
2603 if(orig_type == NULL)
2606 type_t *type = skip_typeref(orig_type);
2607 if(!is_type_arithmetic(type)) {
2608 /* TODO: improve error message */
2609 parser_print_error_prefix();
2610 fprintf(stderr, "operation needs an arithmetic type\n");
2614 expression->expression.datatype = orig_type;
2617 static void semantic_dereference(unary_expression_t *expression)
2619 type_t *orig_type = expression->value->datatype;
2620 if(orig_type == NULL)
2623 type_t *type = skip_typeref(orig_type);
2624 if(type->type != TYPE_POINTER) {
2625 /* TODO: improve error message */
2626 parser_print_error_prefix();
2627 fprintf(stderr, "operation needs a pointer type\n");
2631 pointer_type_t *pointer_type = (pointer_type_t*) type;
2632 expression->expression.datatype = pointer_type->points_to;
2635 static void semantic_take_addr(unary_expression_t *expression)
2637 type_t *orig_type = expression->value->datatype;
2638 if(orig_type == NULL)
2641 expression->expression.datatype = make_pointer_type(orig_type, 0);
2644 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
2645 static expression_t *parse_##unexpression_type(unsigned precedence) \
2649 unary_expression_t *unary_expression \
2650 = allocate_ast_zero(sizeof(unary_expression[0])); \
2651 unary_expression->expression.type = EXPR_UNARY; \
2652 unary_expression->type = unexpression_type; \
2653 unary_expression->value = parse_sub_expression(precedence); \
2655 sfunc(unary_expression); \
2657 return (expression_t*) unary_expression; \
2660 CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE, semantic_unexpr_arithmetic)
2661 CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS, semantic_unexpr_arithmetic)
2662 CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT, semantic_unexpr_arithmetic)
2663 CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE, semantic_dereference)
2664 CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS, semantic_take_addr)
2665 CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE,
2666 semantic_unexpr_arithmetic)
2667 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT,
2668 semantic_unexpr_arithmetic)
2669 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_PREFIX_DECREMENT,
2670 semantic_unexpr_arithmetic)
2672 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
2674 static expression_t *parse_##unexpression_type(unsigned precedence, \
2675 expression_t *left) \
2677 (void) precedence; \
2680 unary_expression_t *unary_expression \
2681 = allocate_ast_zero(sizeof(unary_expression[0])); \
2682 unary_expression->expression.type = EXPR_UNARY; \
2683 unary_expression->type = unexpression_type; \
2684 unary_expression->value = left; \
2686 sfunc(unary_expression); \
2688 return (expression_t*) unary_expression; \
2691 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT,
2692 semantic_unexpr_arithmetic)
2693 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT,
2694 semantic_unexpr_arithmetic)
2696 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
2698 /* TODO: handle complex + imaginary types */
2700 /* § 6.3.1.8 Usual arithmetic conversions */
2701 if(type_left == type_long_double || type_right == type_long_double) {
2702 return type_long_double;
2703 } else if(type_left == type_double || type_right == type_double) {
2705 } else if(type_left == type_float || type_right == type_float) {
2709 type_right = promote_integer(type_right);
2710 type_left = promote_integer(type_left);
2712 if(type_left == type_right)
2715 bool signed_left = is_type_signed(type_left);
2716 bool signed_right = is_type_signed(type_right);
2717 if(get_rank(type_left) < get_rank(type_right)) {
2718 if(signed_left == signed_right || !signed_right) {
2724 if(signed_left == signed_right || !signed_left) {
2732 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
2734 expression_t *left = expression->left;
2735 expression_t *right = expression->right;
2736 type_t *orig_type_left = left->datatype;
2737 type_t *orig_type_right = right->datatype;
2739 if(orig_type_left == NULL || orig_type_right == NULL)
2742 type_t *type_left = skip_typeref(orig_type_left);
2743 type_t *type_right = skip_typeref(orig_type_right);
2745 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
2746 /* TODO: improve error message */
2747 parser_print_error_prefix();
2748 fprintf(stderr, "operation needs arithmetic types\n");
2752 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
2753 expression->left = create_implicit_cast(left, arithmetic_type);
2754 expression->right = create_implicit_cast(right, arithmetic_type);
2755 expression->expression.datatype = arithmetic_type;
2758 static void semantic_add(binary_expression_t *expression)
2760 expression_t *left = expression->left;
2761 expression_t *right = expression->right;
2762 type_t *orig_type_left = left->datatype;
2763 type_t *orig_type_right = right->datatype;
2765 if(orig_type_left == NULL || orig_type_right == NULL)
2768 type_t *type_left = skip_typeref(orig_type_left);
2769 type_t *type_right = skip_typeref(orig_type_right);
2772 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
2773 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
2774 expression->left = create_implicit_cast(left, arithmetic_type);
2775 expression->right = create_implicit_cast(right, arithmetic_type);
2776 expression->expression.datatype = arithmetic_type;
2778 } else if(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
2779 expression->expression.datatype = type_left;
2780 } else if(type_right->type == TYPE_POINTER && is_type_integer(type_left)) {
2781 expression->expression.datatype = type_right;
2783 parser_print_error_prefix();
2784 fprintf(stderr, "invalid operands to binary + (");
2785 print_type(orig_type_left);
2786 fprintf(stderr, ", ");
2787 print_type(orig_type_right);
2788 fprintf(stderr, ")\n");
2792 static void semantic_sub(binary_expression_t *expression)
2794 expression_t *left = expression->left;
2795 expression_t *right = expression->right;
2796 type_t *orig_type_left = left->datatype;
2797 type_t *orig_type_right = right->datatype;
2799 if(orig_type_left == NULL || orig_type_right == NULL)
2802 type_t *type_left = skip_typeref(orig_type_left);
2803 type_t *type_right = skip_typeref(orig_type_right);
2806 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
2807 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
2808 expression->left = create_implicit_cast(left, arithmetic_type);
2809 expression->right = create_implicit_cast(right, arithmetic_type);
2810 expression->expression.datatype = arithmetic_type;
2812 } else if(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
2813 expression->expression.datatype = type_left;
2814 } else if(type_left->type == TYPE_POINTER &&
2815 type_right->type == TYPE_POINTER) {
2816 if(!pointers_compatible(type_left, type_right)) {
2817 parser_print_error_prefix();
2818 fprintf(stderr, "pointers to incompatible objects to binary - (");
2819 print_type(orig_type_left);
2820 fprintf(stderr, ", ");
2821 print_type(orig_type_right);
2822 fprintf(stderr, ")\n");
2824 expression->expression.datatype = type_ptrdiff_t;
2827 parser_print_error_prefix();
2828 fprintf(stderr, "invalid operands to binary - (");
2829 print_type(orig_type_left);
2830 fprintf(stderr, ", ");
2831 print_type(orig_type_right);
2832 fprintf(stderr, ")\n");
2836 static void semantic_comparison(binary_expression_t *expression)
2838 expression_t *left = expression->left;
2839 expression_t *right = expression->right;
2840 type_t *orig_type_left = left->datatype;
2841 type_t *orig_type_right = right->datatype;
2843 if(orig_type_left == NULL || orig_type_right == NULL)
2846 type_t *type_left = skip_typeref(orig_type_left);
2847 type_t *type_right = skip_typeref(orig_type_right);
2849 /* TODO non-arithmetic types */
2850 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
2851 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
2852 expression->left = create_implicit_cast(left, arithmetic_type);
2853 expression->right = create_implicit_cast(right, arithmetic_type);
2854 expression->expression.datatype = arithmetic_type;
2856 expression->expression.datatype = type_int;
2859 static void semantic_arithmetic_assign(binary_expression_t *expression)
2861 expression_t *left = expression->left;
2862 expression_t *right = expression->right;
2863 type_t *orig_type_left = left->datatype;
2864 type_t *orig_type_right = right->datatype;
2866 if(orig_type_left == NULL || orig_type_right == NULL)
2869 type_t *type_left = skip_typeref(orig_type_left);
2870 type_t *type_right = skip_typeref(orig_type_right);
2872 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
2873 /* TODO: improve error message */
2874 parser_print_error_prefix();
2875 fprintf(stderr, "operation needs arithmetic types\n");
2879 /* combined instructions are tricky. We can't create an implicit cast on
2880 * the left side, because we need the uncasted form for the store.
2881 * The ast2firm pass has to know that left_type must be right_type
2882 * for the arithmeitc operation and create a cast by itself */
2883 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
2884 expression->right = create_implicit_cast(right, arithmetic_type);
2885 expression->expression.datatype = type_left;
2888 static void semantic_logical_op(binary_expression_t *expression)
2890 expression_t *left = expression->left;
2891 expression_t *right = expression->right;
2892 type_t *orig_type_left = left->datatype;
2893 type_t *orig_type_right = right->datatype;
2895 if(orig_type_left == NULL || orig_type_right == NULL)
2898 type_t *type_left = skip_typeref(orig_type_left);
2899 type_t *type_right = skip_typeref(orig_type_right);
2901 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
2902 /* TODO: improve error message */
2903 parser_print_error_prefix();
2904 fprintf(stderr, "operation needs arithmetic types\n");
2908 expression->expression.datatype = type_int;
2911 static void semantic_binexpr_assign(binary_expression_t *expression)
2913 expression_t *left = expression->left;
2914 type_t *type_left = left->datatype;
2916 if(type_left != NULL) {
2917 semantic_assign(type_left, &expression->right, "assignment");
2920 expression->expression.datatype = type_left;
2923 static void semantic_comma(binary_expression_t *expression)
2925 expression->expression.datatype = expression->right->datatype;
2928 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
2929 static expression_t *parse_##binexpression_type(unsigned precedence, \
2930 expression_t *left) \
2934 expression_t *right = parse_sub_expression(precedence + lr); \
2936 binary_expression_t *binexpr \
2937 = allocate_ast_zero(sizeof(binexpr[0])); \
2938 binexpr->expression.type = EXPR_BINARY; \
2939 binexpr->type = binexpression_type; \
2940 binexpr->left = left; \
2941 binexpr->right = right; \
2944 return (expression_t*) binexpr; \
2947 CREATE_BINEXPR_PARSER(',', BINEXPR_COMMA, semantic_comma, 1)
2948 CREATE_BINEXPR_PARSER('*', BINEXPR_MUL, semantic_binexpr_arithmetic, 1)
2949 CREATE_BINEXPR_PARSER('/', BINEXPR_DIV, semantic_binexpr_arithmetic, 1)
2950 CREATE_BINEXPR_PARSER('%', BINEXPR_MOD, semantic_binexpr_arithmetic, 1)
2951 CREATE_BINEXPR_PARSER('+', BINEXPR_ADD, semantic_add, 1)
2952 CREATE_BINEXPR_PARSER('-', BINEXPR_SUB, semantic_sub, 1)
2953 CREATE_BINEXPR_PARSER('<', BINEXPR_LESS, semantic_comparison, 1)
2954 CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER, semantic_comparison, 1)
2955 CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN, semantic_binexpr_assign, 0)
2956 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL, semantic_comparison, 1)
2957 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, BINEXPR_NOTEQUAL,
2958 semantic_comparison, 1)
2959 CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL, semantic_comparison, 1)
2960 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL,
2961 semantic_comparison, 1)
2962 CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND, semantic_binexpr_arithmetic, 1)
2963 CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR, semantic_binexpr_arithmetic, 1)
2964 CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR, semantic_binexpr_arithmetic, 1)
2965 CREATE_BINEXPR_PARSER(T_ANDAND, BINEXPR_LOGICAL_AND, semantic_logical_op, 1)
2966 CREATE_BINEXPR_PARSER(T_PIPEPIPE, BINEXPR_LOGICAL_OR, semantic_logical_op, 1)
2967 /* TODO shift has a bit special semantic */
2968 CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT,
2969 semantic_binexpr_arithmetic, 1)
2970 CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT,
2971 semantic_binexpr_arithmetic, 1)
2972 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, BINEXPR_ADD_ASSIGN,
2973 semantic_arithmetic_assign, 0)
2974 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, BINEXPR_SUB_ASSIGN,
2975 semantic_arithmetic_assign, 0)
2976 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, BINEXPR_MUL_ASSIGN,
2977 semantic_arithmetic_assign, 0)
2978 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_DIV_ASSIGN,
2979 semantic_arithmetic_assign, 0)
2980 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, BINEXPR_MOD_ASSIGN,
2981 semantic_arithmetic_assign, 0)
2982 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, BINEXPR_SHIFTLEFT_ASSIGN,
2983 semantic_arithmetic_assign, 0)
2984 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, BINEXPR_SHIFTRIGHT_ASSIGN,
2985 semantic_arithmetic_assign, 0)
2986 CREATE_BINEXPR_PARSER(T_ANDEQUAL, BINEXPR_BITWISE_AND_ASSIGN,
2987 semantic_arithmetic_assign, 0)
2988 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, BINEXPR_BITWISE_OR_ASSIGN,
2989 semantic_arithmetic_assign, 0)
2990 CREATE_BINEXPR_PARSER(T_CARETEQUAL, BINEXPR_BITWISE_XOR_ASSIGN,
2991 semantic_arithmetic_assign, 0)
2993 static expression_t *parse_sub_expression(unsigned precedence)
2995 if(token.type < 0) {
2996 return expected_expression_error();
2999 expression_parser_function_t *parser
3000 = &expression_parsers[token.type];
3001 source_position_t source_position = token.source_position;
3004 if(parser->parser != NULL) {
3005 left = parser->parser(parser->precedence);
3007 left = parse_primary_expression();
3009 assert(left != NULL);
3010 left->source_position = source_position;
3013 if(token.type < 0) {
3014 return expected_expression_error();
3017 parser = &expression_parsers[token.type];
3018 if(parser->infix_parser == NULL)
3020 if(parser->infix_precedence < precedence)
3023 left = parser->infix_parser(parser->infix_precedence, left);
3025 assert(left != NULL);
3026 assert(left->type != EXPR_INVALID);
3027 left->source_position = source_position;
3033 static expression_t *parse_expression(void)
3035 return parse_sub_expression(1);
3040 static void register_expression_parser(parse_expression_function parser,
3041 int token_type, unsigned precedence)
3043 expression_parser_function_t *entry = &expression_parsers[token_type];
3045 if(entry->parser != NULL) {
3046 fprintf(stderr, "for token ");
3047 print_token_type(stderr, token_type);
3048 fprintf(stderr, "\n");
3049 panic("trying to register multiple expression parsers for a token");
3051 entry->parser = parser;
3052 entry->precedence = precedence;
3055 static void register_expression_infix_parser(
3056 parse_expression_infix_function parser, int token_type,
3057 unsigned precedence)
3059 expression_parser_function_t *entry = &expression_parsers[token_type];
3061 if(entry->infix_parser != NULL) {
3062 fprintf(stderr, "for token ");
3063 print_token_type(stderr, token_type);
3064 fprintf(stderr, "\n");
3065 panic("trying to register multiple infix expression parsers for a "
3068 entry->infix_parser = parser;
3069 entry->infix_precedence = precedence;
3072 static void init_expression_parsers(void)
3074 memset(&expression_parsers, 0, sizeof(expression_parsers));
3076 register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16);
3077 register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16);
3078 register_expression_infix_parser(parse_BINEXPR_MOD, '%', 16);
3079 register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT, T_LESSLESS, 16);
3080 register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT,
3081 T_GREATERGREATER, 16);
3082 register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15);
3083 register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15);
3084 register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14);
3085 register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14);
3086 register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14);
3087 register_expression_infix_parser(parse_BINEXPR_GREATEREQUAL,
3088 T_GREATEREQUAL, 14);
3089 register_expression_infix_parser(parse_BINEXPR_EQUAL, T_EQUALEQUAL, 13);
3090 register_expression_infix_parser(parse_BINEXPR_NOTEQUAL,
3091 T_EXCLAMATIONMARKEQUAL, 13);
3092 register_expression_infix_parser(parse_BINEXPR_BITWISE_AND, '&', 12);
3093 register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR, '^', 11);
3094 register_expression_infix_parser(parse_BINEXPR_BITWISE_OR, '|', 10);
3095 register_expression_infix_parser(parse_BINEXPR_LOGICAL_AND, T_ANDAND, 9);
3096 register_expression_infix_parser(parse_BINEXPR_LOGICAL_OR, T_PIPEPIPE, 8);
3097 register_expression_infix_parser(parse_conditional_expression, '?', 7);
3098 register_expression_infix_parser(parse_BINEXPR_ASSIGN, '=', 2);
3099 register_expression_infix_parser(parse_BINEXPR_ADD_ASSIGN, T_PLUSEQUAL, 2);
3100 register_expression_infix_parser(parse_BINEXPR_SUB_ASSIGN, T_MINUSEQUAL, 2);
3101 register_expression_infix_parser(parse_BINEXPR_MUL_ASSIGN,
3102 T_ASTERISKEQUAL, 2);
3103 register_expression_infix_parser(parse_BINEXPR_DIV_ASSIGN, T_SLASHEQUAL, 2);
3104 register_expression_infix_parser(parse_BINEXPR_MOD_ASSIGN,
3106 register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT_ASSIGN,
3107 T_LESSLESSEQUAL, 2);
3108 register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT_ASSIGN,
3109 T_GREATERGREATEREQUAL, 2);
3110 register_expression_infix_parser(parse_BINEXPR_BITWISE_AND_ASSIGN,
3112 register_expression_infix_parser(parse_BINEXPR_BITWISE_OR_ASSIGN,
3114 register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR_ASSIGN,
3117 register_expression_infix_parser(parse_BINEXPR_COMMA, ',', 1);
3119 register_expression_infix_parser(parse_array_expression, '[', 30);
3120 register_expression_infix_parser(parse_call_expression, '(', 30);
3121 register_expression_infix_parser(parse_select_expression, '.', 30);
3122 register_expression_infix_parser(parse_select_expression,
3123 T_MINUSGREATER, 30);
3124 register_expression_infix_parser(parse_UNEXPR_POSTFIX_INCREMENT,
3126 register_expression_infix_parser(parse_UNEXPR_POSTFIX_DECREMENT,
3129 register_expression_parser(parse_UNEXPR_NEGATE, '-', 25);
3130 register_expression_parser(parse_UNEXPR_PLUS, '+', 25);
3131 register_expression_parser(parse_UNEXPR_NOT, '!', 25);
3132 register_expression_parser(parse_UNEXPR_BITWISE_NEGATE, '~', 25);
3133 register_expression_parser(parse_UNEXPR_DEREFERENCE, '*', 25);
3134 register_expression_parser(parse_UNEXPR_TAKE_ADDRESS, '&', 25);
3135 register_expression_parser(parse_UNEXPR_PREFIX_INCREMENT, T_PLUSPLUS, 25);
3136 register_expression_parser(parse_UNEXPR_PREFIX_DECREMENT, T_MINUSMINUS, 25);
3137 register_expression_parser(parse_sizeof, T_sizeof, 25);
3138 register_expression_parser(parse_extension, T___extension__, 25);
3142 static statement_t *parse_case_statement(void)
3145 case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
3146 label->statement.type = STATEMENT_CASE_LABEL;
3147 label->statement.source_position = token.source_position;
3149 label->expression = parse_expression();
3152 label->statement.next = parse_statement();
3154 return (statement_t*) label;
3157 static statement_t *parse_default_statement(void)
3161 case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
3162 label->statement.type = STATEMENT_CASE_LABEL;
3163 label->statement.source_position = token.source_position;
3166 label->statement.next = parse_statement();
3168 return (statement_t*) label;
3171 static declaration_t *get_label(symbol_t *symbol)
3173 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
3174 assert(current_function != NULL);
3175 /* if we found a label in the same function, then we already created the
3177 if(candidate != NULL
3178 && candidate->parent_context == ¤t_function->context) {
3182 /* otherwise we need to create a new one */
3183 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
3184 declaration->namespace = NAMESPACE_LABEL;
3185 declaration->symbol = symbol;
3187 label_push(declaration);
3192 static statement_t *parse_label_statement(void)
3194 assert(token.type == T_IDENTIFIER);
3195 symbol_t *symbol = token.v.symbol;
3198 declaration_t *label = get_label(symbol);
3200 /* if source position is already set then the label is defined twice,
3201 * otherwise it was just mentioned in a goto so far */
3202 if(label->source_position.input_name != NULL) {
3203 parser_print_error_prefix();
3204 fprintf(stderr, "duplicate label '%s'\n", symbol->string);
3205 parser_print_error_prefix_pos(label->source_position);
3206 fprintf(stderr, "previous definition of '%s' was here\n",
3209 label->source_position = token.source_position;
3212 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
3214 label_statement->statement.type = STATEMENT_LABEL;
3215 label_statement->statement.source_position = token.source_position;
3216 label_statement->label = label;
3220 if(token.type == '}') {
3221 parse_error("label at end of compound statement");
3222 return (statement_t*) label_statement;
3224 label_statement->label_statement = parse_statement();
3227 return (statement_t*) label_statement;
3230 static statement_t *parse_if(void)
3234 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3235 statement->statement.type = STATEMENT_IF;
3236 statement->statement.source_position = token.source_position;
3239 statement->condition = parse_expression();
3242 statement->true_statement = parse_statement();
3243 if(token.type == T_else) {
3245 statement->false_statement = parse_statement();
3248 return (statement_t*) statement;
3251 static statement_t *parse_switch(void)
3255 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3256 statement->statement.type = STATEMENT_SWITCH;
3257 statement->statement.source_position = token.source_position;
3260 statement->expression = parse_expression();
3262 statement->body = parse_statement();
3264 return (statement_t*) statement;
3267 static statement_t *parse_while(void)
3271 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3272 statement->statement.type = STATEMENT_WHILE;
3273 statement->statement.source_position = token.source_position;
3276 statement->condition = parse_expression();
3278 statement->body = parse_statement();
3280 return (statement_t*) statement;
3283 static statement_t *parse_do(void)
3287 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3288 statement->statement.type = STATEMENT_DO_WHILE;
3289 statement->statement.source_position = token.source_position;
3291 statement->body = parse_statement();
3294 statement->condition = parse_expression();
3298 return (statement_t*) statement;
3301 static statement_t *parse_for(void)
3305 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3306 statement->statement.type = STATEMENT_FOR;
3307 statement->statement.source_position = token.source_position;
3311 int top = environment_top();
3312 context_t *last_context = context;
3313 set_context(&statement->context);
3315 if(token.type != ';') {
3316 if(is_declaration_specifier(&token, false)) {
3317 parse_declaration();
3319 statement->initialisation = parse_expression();
3326 if(token.type != ';') {
3327 statement->condition = parse_expression();
3330 if(token.type != ')') {
3331 statement->step = parse_expression();
3334 statement->body = parse_statement();
3336 assert(context == &statement->context);
3337 set_context(last_context);
3338 environment_pop_to(top);
3340 return (statement_t*) statement;
3343 static statement_t *parse_goto(void)
3347 if(token.type != T_IDENTIFIER) {
3348 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
3352 symbol_t *symbol = token.v.symbol;
3355 declaration_t *label = get_label(symbol);
3357 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3359 statement->statement.type = STATEMENT_GOTO;
3360 statement->statement.source_position = token.source_position;
3362 statement->label = label;
3366 return (statement_t*) statement;
3369 static statement_t *parse_continue(void)
3374 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3375 statement->type = STATEMENT_CONTINUE;
3376 statement->source_position = token.source_position;
3381 static statement_t *parse_break(void)
3386 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3387 statement->type = STATEMENT_BREAK;
3388 statement->source_position = token.source_position;
3393 static statement_t *parse_return(void)
3397 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3399 statement->statement.type = STATEMENT_RETURN;
3400 statement->statement.source_position = token.source_position;
3402 assert(current_function->type->type == TYPE_FUNCTION);
3403 function_type_t *function_type = (function_type_t*) current_function->type;
3404 type_t *return_type = function_type->result_type;
3406 expression_t *return_value;
3407 if(token.type != ';') {
3408 return_value = parse_expression();
3410 if(return_type == type_void && return_value->datatype != type_void) {
3411 parse_warning("'return' with a value, in function returning void");
3412 return_value = NULL;
3414 if(return_type != NULL) {
3415 semantic_assign(return_type, &return_value, "'return'");
3419 return_value = NULL;
3420 if(return_type != type_void) {
3421 parse_warning("'return' without value, in function returning "
3425 statement->return_value = return_value;
3429 return (statement_t*) statement;
3432 static statement_t *parse_declaration_statement(void)
3434 declaration_t *before = last_declaration;
3436 declaration_statement_t *statement
3437 = allocate_ast_zero(sizeof(statement[0]));
3438 statement->statement.type = STATEMENT_DECLARATION;
3439 statement->statement.source_position = token.source_position;
3441 declaration_specifiers_t specifiers;
3442 memset(&specifiers, 0, sizeof(specifiers));
3443 parse_declaration_specifiers(&specifiers);
3445 if(token.type == ';') {
3448 parse_init_declarators(&specifiers);
3451 if(before == NULL) {
3452 statement->declarations_begin = context->declarations;
3454 statement->declarations_begin = before->next;
3456 statement->declarations_end = last_declaration;
3458 return (statement_t*) statement;
3461 static statement_t *parse_expression_statement(void)
3463 expression_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
3464 statement->statement.type = STATEMENT_EXPRESSION;
3465 statement->statement.source_position = token.source_position;
3467 statement->expression = parse_expression();
3471 return (statement_t*) statement;
3474 static statement_t *parse_statement(void)
3476 statement_t *statement = NULL;
3478 /* declaration or statement */
3479 switch(token.type) {
3481 statement = parse_case_statement();
3485 statement = parse_default_statement();
3489 statement = parse_compound_statement();
3493 statement = parse_if();
3497 statement = parse_switch();
3501 statement = parse_while();
3505 statement = parse_do();
3509 statement = parse_for();
3513 statement = parse_goto();
3517 statement = parse_continue();
3521 statement = parse_break();
3525 statement = parse_return();
3534 if(look_ahead(1)->type == ':') {
3535 statement = parse_label_statement();
3539 if(is_typedef_symbol(token.v.symbol)) {
3540 statement = parse_declaration_statement();
3544 statement = parse_expression_statement();
3547 case T___extension__:
3548 /* this can be a prefix to a declaration or an expression statement */
3549 /* we simply eat it now and parse the rest with tail recursion */
3552 } while(token.type == T___extension__);
3553 statement = parse_statement();
3557 statement = parse_declaration_statement();
3561 statement = parse_expression_statement();
3565 assert(statement == NULL || statement->source_position.input_name != NULL);
3570 static statement_t *parse_compound_statement(void)
3572 compound_statement_t *compound_statement
3573 = allocate_ast_zero(sizeof(compound_statement[0]));
3574 compound_statement->statement.type = STATEMENT_COMPOUND;
3575 compound_statement->statement.source_position = token.source_position;
3579 int top = environment_top();
3580 context_t *last_context = context;
3581 set_context(&compound_statement->context);
3583 statement_t *last_statement = NULL;
3585 while(token.type != '}' && token.type != T_EOF) {
3586 statement_t *statement = parse_statement();
3587 if(statement == NULL)
3590 if(last_statement != NULL) {
3591 last_statement->next = statement;
3593 compound_statement->statements = statement;
3596 while(statement->next != NULL)
3597 statement = statement->next;
3599 last_statement = statement;
3602 if(token.type != '}') {
3603 parser_print_error_prefix_pos(
3604 compound_statement->statement.source_position);
3605 fprintf(stderr, "end of file while looking for closing '}'\n");
3609 assert(context == &compound_statement->context);
3610 set_context(last_context);
3611 environment_pop_to(top);
3613 return (statement_t*) compound_statement;
3616 static translation_unit_t *parse_translation_unit(void)
3618 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
3620 assert(global_context == NULL);
3621 global_context = &unit->context;
3623 assert(context == NULL);
3624 set_context(&unit->context);
3626 while(token.type != T_EOF) {
3627 parse_declaration();
3630 assert(context == &unit->context);
3632 last_declaration = NULL;
3634 assert(global_context == &unit->context);
3635 global_context = NULL;
3640 translation_unit_t *parse(void)
3642 environment_stack = NEW_ARR_F(stack_entry_t, 0);
3643 label_stack = NEW_ARR_F(stack_entry_t, 0);
3644 found_error = false;
3646 type_set_output(stderr);
3647 ast_set_output(stderr);
3649 lookahead_bufpos = 0;
3650 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
3653 translation_unit_t *unit = parse_translation_unit();
3655 DEL_ARR_F(environment_stack);
3656 DEL_ARR_F(label_stack);
3664 void init_parser(void)
3666 init_expression_parsers();
3667 obstack_init(&temp_obst);
3669 type_int = make_atomic_type(ATOMIC_TYPE_INT, 0);
3670 type_uint = make_atomic_type(ATOMIC_TYPE_UINT, 0);
3671 type_long_double = make_atomic_type(ATOMIC_TYPE_LONG_DOUBLE, 0);
3672 type_double = make_atomic_type(ATOMIC_TYPE_DOUBLE, 0);
3673 type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, 0);
3674 type_size_t = make_atomic_type(ATOMIC_TYPE_ULONG, 0);
3675 type_ptrdiff_t = make_atomic_type(ATOMIC_TYPE_LONG, 0);
3676 type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST);
3677 type_void = make_atomic_type(ATOMIC_TYPE_VOID, 0);
3678 type_string = make_pointer_type(type_const_char, 0);
3681 void exit_parser(void)
3683 obstack_free(&temp_obst, NULL);