58 // =======================================================================
60 // =======================================================================
63 oberon_error(oberon_context_t
* ctx
, const char * fmt
, ...)
67 fprintf(stderr
, "error: ");
68 vfprintf(stderr
, fmt
, ptr
);
69 fprintf(stderr
, "\n");
70 fprintf(stderr
, " code_index = %i\n", ctx
-> code_index
);
71 fprintf(stderr
, " c = %c\n", ctx
-> c
);
72 fprintf(stderr
, " token = %i\n", ctx
-> token
);
77 static oberon_type_t
*
78 oberon_new_type_ptr(int class)
80 oberon_type_t
* x
= malloc(sizeof *x
);
81 memset(x
, 0, sizeof *x
);
86 static oberon_type_t
*
87 oberon_new_type_integer(int size
)
90 x
= oberon_new_type_ptr(OBERON_TYPE_INTEGER
);
95 static oberon_type_t
*
96 oberon_new_type_boolean(int size
)
99 x
= oberon_new_type_ptr(OBERON_TYPE_BOOLEAN
);
104 // =======================================================================
106 // =======================================================================
108 static oberon_scope_t
*
109 oberon_open_scope(oberon_context_t
* ctx
)
111 oberon_scope_t
* scope
= malloc(sizeof *scope
);
112 memset(scope
, 0, sizeof *scope
);
114 oberon_object_t
* list
= malloc(sizeof *list
);
115 memset(list
, 0, sizeof *list
);
118 scope
-> list
= list
;
119 scope
-> up
= ctx
-> decl
;
123 scope
-> parent
= scope
-> up
-> parent
;
124 scope
-> local
= scope
-> up
-> local
;
132 oberon_close_scope(oberon_scope_t
* scope
)
134 oberon_context_t
* ctx
= scope
-> ctx
;
135 ctx
-> decl
= scope
-> up
;
138 static oberon_object_t
*
139 oberon_define_object(oberon_scope_t
* scope
, char * name
, int class)
141 oberon_object_t
* x
= scope
-> list
;
142 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
149 oberon_error(scope
-> ctx
, "already defined");
152 oberon_object_t
* newvar
= malloc(sizeof *newvar
);
153 memset(newvar
, 0, sizeof *newvar
);
154 newvar
-> name
= name
;
155 newvar
-> class = class;
156 newvar
-> local
= scope
-> local
;
157 newvar
-> parent
= scope
-> parent
;
165 oberon_define_field(oberon_context_t
* ctx
, oberon_type_t
* rec
, char * name
, oberon_type_t
* type
)
167 // TODO check base fields
169 oberon_object_t
* x
= rec
-> decl
;
170 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
177 oberon_error(ctx
, "multiple definition");
180 oberon_object_t
* field
= malloc(sizeof *field
);
181 memset(field
, 0, sizeof *field
);
182 field
-> name
= name
;
183 field
-> class = OBERON_CLASS_FIELD
;
184 field
-> type
= type
;
186 field
-> parent
= NULL
;
188 rec
-> num_decl
+= 1;
192 static oberon_object_t
*
193 oberon_find_object_in_list(oberon_object_t
* list
, char * name
)
195 oberon_object_t
* x
= list
;
196 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
203 static oberon_object_t
*
204 oberon_find_object(oberon_scope_t
* scope
, char * name
, int check_it
)
206 oberon_object_t
* result
= NULL
;
208 oberon_scope_t
* s
= scope
;
209 while(result
== NULL
&& s
!= NULL
)
211 result
= oberon_find_object_in_list(s
-> list
, name
);
215 if(check_it
&& result
== NULL
)
217 oberon_error(scope
-> ctx
, "undefined ident %s", name
);
223 static oberon_object_t
*
224 oberon_find_field(oberon_context_t
* ctx
, oberon_type_t
* rec
, char * name
)
226 oberon_object_t
* x
= rec
-> decl
;
227 for(int i
= 0; i
< rec
-> num_decl
; i
++)
229 if(strcmp(x
-> name
, name
) == 0)
236 oberon_error(ctx
, "field not defined");
241 static oberon_object_t
*
242 oberon_define_type(oberon_scope_t
* scope
, char * name
, oberon_type_t
* type
)
244 oberon_object_t
* id
;
245 id
= oberon_define_object(scope
, name
, OBERON_CLASS_TYPE
);
247 oberon_generator_init_type(scope
-> ctx
, type
);
252 static oberon_type_t *
253 oberon_find_type(oberon_scope_t * scope, char * name)
255 oberon_object_t * x = oberon_find_object(scope, name);
256 if(x -> class != OBERON_CLASS_TYPE)
258 oberon_error(scope -> ctx, "%s not a type", name);
265 static oberon_object_t
*
266 oberon_define_var(oberon_scope_t
* scope
, int class, char * name
, oberon_type_t
* type
)
268 oberon_object_t
* var
;
269 var
= oberon_define_object(scope
, name
, class);
275 static oberon_object_t *
276 oberon_find_var(oberon_scope_t * scope, char * name)
278 oberon_object_t * x = oberon_find_object(scope, name);
280 if(x -> class != OBERON_CLASS_VAR)
282 oberon_error(scope -> ctx, "%s not a var", name);
290 static oberon_object_t *
291 oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signature)
293 oberon_object_t * proc;
294 proc = oberon_define_object(scope, name, OBERON_CLASS_PROC);
295 proc -> type = signature;
300 // =======================================================================
302 // =======================================================================
305 oberon_get_char(oberon_context_t
* ctx
)
307 ctx
-> code_index
+= 1;
308 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
312 oberon_init_scaner(oberon_context_t
* ctx
, const char * code
)
315 ctx
-> code_index
= 0;
316 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
320 oberon_read_ident(oberon_context_t
* ctx
)
323 int i
= ctx
-> code_index
;
325 int c
= ctx
-> code
[i
];
333 char * ident
= malloc(len
+ 1);
334 memcpy(ident
, &ctx
->code
[ctx
->code_index
], len
);
337 ctx
-> code_index
= i
;
338 ctx
-> c
= ctx
-> code
[i
];
339 ctx
-> string
= ident
;
340 ctx
-> token
= IDENT
;
342 if(strcmp(ident
, "MODULE") == 0)
344 ctx
-> token
= MODULE
;
346 else if(strcmp(ident
, "END") == 0)
350 else if(strcmp(ident
, "VAR") == 0)
354 else if(strcmp(ident
, "BEGIN") == 0)
356 ctx
-> token
= BEGIN
;
358 else if(strcmp(ident
, "TRUE") == 0)
362 else if(strcmp(ident
, "FALSE") == 0)
364 ctx
-> token
= FALSE
;
366 else if(strcmp(ident
, "OR") == 0)
370 else if(strcmp(ident
, "DIV") == 0)
374 else if(strcmp(ident
, "MOD") == 0)
378 else if(strcmp(ident
, "PROCEDURE") == 0)
380 ctx
-> token
= PROCEDURE
;
382 else if(strcmp(ident
, "RETURN") == 0)
384 ctx
-> token
= RETURN
;
386 else if(strcmp(ident
, "CONST") == 0)
388 ctx
-> token
= CONST
;
390 else if(strcmp(ident
, "TYPE") == 0)
394 else if(strcmp(ident
, "ARRAY") == 0)
396 ctx
-> token
= ARRAY
;
398 else if(strcmp(ident
, "OF") == 0)
402 else if(strcmp(ident
, "RECORD") == 0)
404 ctx
-> token
= RECORD
;
406 else if(strcmp(ident
, "POINTER") == 0)
408 ctx
-> token
= POINTER
;
410 else if(strcmp(ident
, "TO") == 0)
414 else if(strcmp(ident
, "NIL") == 0)
421 oberon_read_integer(oberon_context_t
* ctx
)
424 int i
= ctx
-> code_index
;
426 int c
= ctx
-> code
[i
];
434 char * ident
= malloc(len
+ 2);
435 memcpy(ident
, &ctx
->code
[ctx
->code_index
], len
);
438 ctx
-> code_index
= i
;
439 ctx
-> c
= ctx
-> code
[i
];
440 ctx
-> string
= ident
;
441 ctx
-> integer
= atoi(ident
);
442 ctx
-> token
= INTEGER
;
446 oberon_skip_space(oberon_context_t
* ctx
)
448 while(isspace(ctx
-> c
))
450 oberon_get_char(ctx
);
455 oberon_read_symbol(oberon_context_t
* ctx
)
464 ctx
-> token
= SEMICOLON
;
465 oberon_get_char(ctx
);
468 ctx
-> token
= COLON
;
469 oberon_get_char(ctx
);
472 ctx
-> token
= ASSIGN
;
473 oberon_get_char(ctx
);
478 oberon_get_char(ctx
);
481 ctx
-> token
= LPAREN
;
482 oberon_get_char(ctx
);
485 ctx
-> token
= RPAREN
;
486 oberon_get_char(ctx
);
489 ctx
-> token
= EQUAL
;
490 oberon_get_char(ctx
);
494 oberon_get_char(ctx
);
498 oberon_get_char(ctx
);
502 oberon_get_char(ctx
);
506 ctx
-> token
= GREAT
;
507 oberon_get_char(ctx
);
511 oberon_get_char(ctx
);
516 oberon_get_char(ctx
);
519 ctx
-> token
= MINUS
;
520 oberon_get_char(ctx
);
524 oberon_get_char(ctx
);
527 ctx
-> token
= SLASH
;
528 oberon_get_char(ctx
);
532 oberon_get_char(ctx
);
536 oberon_get_char(ctx
);
539 ctx
-> token
= COMMA
;
540 oberon_get_char(ctx
);
543 ctx
-> token
= LBRACE
;
544 oberon_get_char(ctx
);
547 ctx
-> token
= RBRACE
;
548 oberon_get_char(ctx
);
551 ctx
-> token
= UPARROW
;
552 oberon_get_char(ctx
);
555 oberon_error(ctx
, "invalid char");
561 oberon_read_token(oberon_context_t
* ctx
)
563 oberon_skip_space(ctx
);
568 oberon_read_ident(ctx
);
572 oberon_read_integer(ctx
);
576 oberon_read_symbol(ctx
);
580 // =======================================================================
582 // =======================================================================
584 static void oberon_expect_token(oberon_context_t
* ctx
, int token
);
585 static oberon_expr_t
* oberon_expr(oberon_context_t
* ctx
);
586 static void oberon_assert_token(oberon_context_t
* ctx
, int token
);
587 static char * oberon_assert_ident(oberon_context_t
* ctx
);
588 static void oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
);
589 static oberon_item_t
* oberon_const_expr(oberon_context_t
* ctx
);
591 static oberon_expr_t
*
592 oberon_new_operator(int op
, oberon_type_t
* result
, oberon_expr_t
* left
, oberon_expr_t
* right
)
594 oberon_oper_t
* operator;
595 operator = malloc(sizeof *operator);
596 memset(operator, 0, sizeof *operator);
598 operator -> is_item
= 0;
599 operator -> result
= result
;
601 operator -> left
= left
;
602 operator -> right
= right
;
604 return (oberon_expr_t
*) operator;
607 static oberon_expr_t
*
608 oberon_new_item(int mode
, oberon_type_t
* result
)
610 oberon_item_t
* item
;
611 item
= malloc(sizeof *item
);
612 memset(item
, 0, sizeof *item
);
615 item
-> result
= result
;
618 return (oberon_expr_t
*)item
;
621 static oberon_expr_t
*
622 oberon_make_unary_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
)
624 oberon_expr_t
* expr
;
625 oberon_type_t
* result
;
627 result
= a
-> result
;
631 if(result
-> class != OBERON_TYPE_INTEGER
)
633 oberon_error(ctx
, "incompatible operator type");
636 expr
= oberon_new_operator(OP_UNARY_MINUS
, result
, a
, NULL
);
638 else if(token
== NOT
)
640 if(result
-> class != OBERON_TYPE_BOOLEAN
)
642 oberon_error(ctx
, "incompatible operator type");
645 expr
= oberon_new_operator(OP_LOGIC_NOT
, result
, a
, NULL
);
649 oberon_error(ctx
, "oberon_make_unary_op: wat");
656 oberon_expr_list(oberon_context_t
* ctx
, int * num_expr
, oberon_expr_t
** first
, int const_expr
)
658 oberon_expr_t
* last
;
661 *first
= last
= oberon_expr(ctx
);
662 while(ctx
-> token
== COMMA
)
664 oberon_assert_token(ctx
, COMMA
);
665 oberon_expr_t
* current
;
669 current
= (oberon_expr_t
*) oberon_const_expr(ctx
);
673 current
= oberon_expr(ctx
);
676 last
-> next
= current
;
682 static oberon_expr_t
*
683 oberon_autocast_to(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* pref
)
685 if(pref
-> class != expr
-> result
-> class)
687 oberon_error(ctx
, "incompatible types");
690 if(pref
-> class == OBERON_TYPE_INTEGER
)
692 if(expr
-> result
-> class > pref
-> class)
694 oberon_error(ctx
, "incompatible size");
697 else if(pref
-> class == OBERON_TYPE_RECORD
)
699 if(expr
-> result
!= pref
)
701 printf("oberon_autocast_to: rec %p != %p\n", expr
-> result
, pref
);
702 oberon_error(ctx
, "incompatible record types");
705 else if(pref
-> class == OBERON_TYPE_POINTER
)
707 if(expr
-> result
-> base
!= pref
-> base
)
709 if(expr
-> result
-> base
-> class != OBERON_TYPE_VOID
)
711 oberon_error(ctx
, "incompatible pointer types");
722 oberon_autocast_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
724 if(desig
-> is_item
== 0)
726 oberon_error(ctx
, "expected item");
729 if(desig
-> item
.mode
!= MODE_CALL
)
731 oberon_error(ctx
, "expected mode CALL");
734 if(desig
-> item
.var
-> class != OBERON_CLASS_PROC
)
736 oberon_error(ctx
, "only procedures can be called");
739 oberon_type_t
* fn
= desig
-> item
.var
-> type
;
740 int num_args
= desig
-> item
.num_args
;
741 int num_decl
= fn
-> num_decl
;
743 if(num_args
< num_decl
)
745 oberon_error(ctx
, "too few arguments");
747 else if(num_args
> num_decl
)
749 oberon_error(ctx
, "too many arguments");
752 oberon_expr_t
* arg
= desig
-> item
.args
;
753 oberon_object_t
* param
= fn
-> decl
;
754 for(int i
= 0; i
< num_args
; i
++)
756 if(param
-> class == OBERON_CLASS_VAR_PARAM
)
760 switch(arg
-> item
.mode
)
765 // Допустимо разыменование?
769 oberon_error(ctx
, "var-parameter accept only variables");
774 oberon_autocast_to(ctx
, arg
, param
-> type
);
776 param
= param
-> next
;
784 || ((x) == INTEGER) \
790 static oberon_expr_t
*
791 oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
793 if(expr
-> result
-> class != OBERON_TYPE_POINTER
)
795 oberon_error(ctx
, "not a pointer");
798 assert(expr
-> is_item
);
800 oberon_expr_t
* selector
;
801 selector
= oberon_new_item(MODE_DEREF
, expr
-> result
-> base
);
802 selector
-> item
.parent
= (oberon_item_t
*) expr
;
807 static oberon_expr_t
*
808 oberon_make_array_selector(oberon_context_t
* ctx
, oberon_expr_t
* desig
, oberon_expr_t
* index
)
810 if(desig
-> result
-> class == OBERON_TYPE_POINTER
)
812 desig
= oberno_make_dereferencing(ctx
, desig
);
815 assert(desig
-> is_item
);
817 if(desig
-> result
-> class != OBERON_TYPE_ARRAY
)
819 oberon_error(ctx
, "not array");
822 oberon_type_t
* base
;
823 base
= desig
-> result
-> base
;
825 if(index
-> result
-> class != OBERON_TYPE_INTEGER
)
827 oberon_error(ctx
, "index must be integer");
830 // Статическая проверка границ массива
833 if(index
-> item
.mode
== MODE_INTEGER
)
835 int arr_size
= desig
-> result
-> size
;
836 int index_int
= index
-> item
.integer
;
837 if(index_int
< 0 || index_int
> arr_size
- 1)
839 oberon_error(ctx
, "not in range (dimension size 0..%i)", arr_size
- 1);
844 oberon_expr_t
* selector
;
845 selector
= oberon_new_item(MODE_INDEX
, base
);
846 selector
-> item
.parent
= (oberon_item_t
*) desig
;
847 selector
-> item
.num_args
= 1;
848 selector
-> item
.args
= index
;
853 static oberon_expr_t
*
854 oberon_make_record_selector(oberon_context_t
* ctx
, oberon_expr_t
* expr
, char * name
)
856 if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
858 expr
= oberno_make_dereferencing(ctx
, expr
);
861 assert(expr
-> is_item
== 1);
863 if(expr
-> result
-> class != OBERON_TYPE_RECORD
)
865 oberon_error(ctx
, "not record");
868 oberon_type_t
* rec
= expr
-> result
;
870 oberon_object_t
* field
;
871 field
= oberon_find_field(ctx
, rec
, name
);
873 oberon_expr_t
* selector
;
874 selector
= oberon_new_item(MODE_FIELD
, field
-> type
);
875 selector
-> item
.var
= field
;
876 selector
-> item
.parent
= (oberon_item_t
*) expr
;
881 #define ISSELECTOR(x) \
886 static oberon_expr_t
*
887 oberon_designator(oberon_context_t
* ctx
)
890 oberon_object_t
* var
;
891 oberon_expr_t
* expr
;
893 name
= oberon_assert_ident(ctx
);
894 var
= oberon_find_object(ctx
-> decl
, name
, 1);
898 case OBERON_CLASS_CONST
:
900 expr
= (oberon_expr_t
*) var
-> value
;
902 case OBERON_CLASS_VAR
:
903 case OBERON_CLASS_VAR_PARAM
:
904 case OBERON_CLASS_PARAM
:
905 expr
= oberon_new_item(MODE_VAR
, var
-> type
);
907 case OBERON_CLASS_PROC
:
908 expr
= oberon_new_item(MODE_CALL
, var
-> type
);
911 oberon_error(ctx
, "invalid designator");
914 expr
-> item
.var
= var
;
916 while(ISSELECTOR(ctx
-> token
))
921 oberon_assert_token(ctx
, DOT
);
922 name
= oberon_assert_ident(ctx
);
923 expr
= oberon_make_record_selector(ctx
, expr
, name
);
926 oberon_assert_token(ctx
, LBRACE
);
928 oberon_expr_t
* indexes
= NULL
;
929 oberon_expr_list(ctx
, &num_indexes
, &indexes
, 0);
930 oberon_assert_token(ctx
, RBRACE
);
932 for(int i
= 0; i
< num_indexes
; i
++)
934 expr
= oberon_make_array_selector(ctx
, expr
, indexes
);
935 indexes
= indexes
-> next
;
939 oberon_assert_token(ctx
, UPARROW
);
940 expr
= oberno_make_dereferencing(ctx
, expr
);
943 oberon_error(ctx
, "oberon_designator: wat");
950 static oberon_expr_t
*
951 oberon_opt_proc_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
953 assert(expr
-> is_item
== 1);
955 if(ctx
-> token
== LPAREN
)
957 if(expr
-> result
-> class != OBERON_TYPE_PROCEDURE
)
959 oberon_error(ctx
, "not a procedure");
962 oberon_assert_token(ctx
, LPAREN
);
965 oberon_expr_t
* arguments
= NULL
;
967 if(ISEXPR(ctx
-> token
))
969 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
972 expr
-> result
= expr
-> item
.var
-> type
-> base
;
973 expr
-> item
.mode
= MODE_CALL
;
974 expr
-> item
.num_args
= num_args
;
975 expr
-> item
.args
= arguments
;
976 oberon_assert_token(ctx
, RPAREN
);
978 oberon_autocast_call(ctx
, expr
);
984 static oberon_expr_t
*
985 oberon_factor(oberon_context_t
* ctx
)
987 oberon_expr_t
* expr
;
992 expr
= oberon_designator(ctx
);
993 expr
= oberon_opt_proc_parens(ctx
, expr
);
996 expr
= oberon_new_item(MODE_INTEGER
, ctx
-> int_type
);
997 expr
-> item
.integer
= ctx
-> integer
;
998 oberon_assert_token(ctx
, INTEGER
);
1001 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
1002 expr
-> item
.boolean
= 1;
1003 oberon_assert_token(ctx
, TRUE
);
1006 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
1007 expr
-> item
.boolean
= 0;
1008 oberon_assert_token(ctx
, FALSE
);
1011 oberon_assert_token(ctx
, LPAREN
);
1012 expr
= oberon_expr(ctx
);
1013 oberon_assert_token(ctx
, RPAREN
);
1016 oberon_assert_token(ctx
, NOT
);
1017 expr
= oberon_factor(ctx
);
1018 expr
= oberon_make_unary_op(ctx
, NOT
, expr
);
1021 oberon_assert_token(ctx
, NIL
);
1022 expr
= oberon_new_item(MODE_NIL
, ctx
-> void_ptr_type
);
1025 oberon_error(ctx
, "invalid expression");
1032 * oberon_autocast_binary_op автоматически переобразовывеат тип по след. правилам:
1033 * 1. Классы обоих типов должны быть одинаковы
1034 * 2. В качестве результата должен быть выбран больший тип.
1035 * 3. Если размер результат не должен быть меньше чем базовый int
1039 oberon_autocast_binary_op(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
, oberon_type_t
** result
)
1041 if((a
-> class) != (b
-> class))
1043 oberon_error(ctx
, "incompatible types");
1046 if((a
-> size
) > (b
-> size
))
1055 if(((*result
) -> class) == OBERON_TYPE_INTEGER
)
1057 if(((*result
) -> size
) < (ctx
-> int_type
-> size
))
1059 *result
= ctx
-> int_type
;
1063 /* TODO: cast types */
1066 #define ITMAKESBOOLEAN(x) \
1067 (((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
1069 #define ITUSEONLYINTEGER(x) \
1070 ((x) >= LESS && (x) <= GEQ)
1072 #define ITUSEONLYBOOLEAN(x) \
1073 (((x) == OR) || ((x) == AND))
1075 static oberon_expr_t
*
1076 oberon_make_bin_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
, oberon_expr_t
* b
)
1078 oberon_expr_t
* expr
;
1079 oberon_type_t
* result
;
1081 if(ITMAKESBOOLEAN(token
))
1083 if(ITUSEONLYINTEGER(token
))
1085 if(a
-> result
-> class != OBERON_TYPE_INTEGER
1086 || b
-> result
-> class != OBERON_TYPE_INTEGER
)
1088 oberon_error(ctx
, "used only with integer types");
1091 else if(ITUSEONLYBOOLEAN(token
))
1093 if(a
-> result
-> class != OBERON_TYPE_BOOLEAN
1094 || b
-> result
-> class != OBERON_TYPE_BOOLEAN
)
1096 oberon_error(ctx
, "used only with boolean type");
1100 result
= ctx
-> bool_type
;
1104 expr
= oberon_new_operator(OP_EQ
, result
, a
, b
);
1106 else if(token
== NEQ
)
1108 expr
= oberon_new_operator(OP_NEQ
, result
, a
, b
);
1110 else if(token
== LESS
)
1112 expr
= oberon_new_operator(OP_LSS
, result
, a
, b
);
1114 else if(token
== LEQ
)
1116 expr
= oberon_new_operator(OP_LEQ
, result
, a
, b
);
1118 else if(token
== GREAT
)
1120 expr
= oberon_new_operator(OP_GRT
, result
, a
, b
);
1122 else if(token
== GEQ
)
1124 expr
= oberon_new_operator(OP_GEQ
, result
, a
, b
);
1126 else if(token
== OR
)
1128 expr
= oberon_new_operator(OP_LOGIC_OR
, result
, a
, b
);
1130 else if(token
== AND
)
1132 expr
= oberon_new_operator(OP_LOGIC_AND
, result
, a
, b
);
1136 oberon_error(ctx
, "oberon_make_bin_op: bool wat");
1141 oberon_autocast_binary_op(ctx
, a
-> result
, b
-> result
, &result
);
1145 expr
= oberon_new_operator(OP_ADD
, result
, a
, b
);
1147 else if(token
== MINUS
)
1149 expr
= oberon_new_operator(OP_SUB
, result
, a
, b
);
1151 else if(token
== STAR
)
1153 expr
= oberon_new_operator(OP_MUL
, result
, a
, b
);
1155 else if(token
== SLASH
)
1157 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1159 else if(token
== DIV
)
1161 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1163 else if(token
== MOD
)
1165 expr
= oberon_new_operator(OP_MOD
, result
, a
, b
);
1169 oberon_error(ctx
, "oberon_make_bin_op: bin wat");
1176 #define ISMULOP(x) \
1177 ((x) >= STAR && (x) <= AND)
1179 static oberon_expr_t
*
1180 oberon_term_expr(oberon_context_t
* ctx
)
1182 oberon_expr_t
* expr
;
1184 expr
= oberon_factor(ctx
);
1185 while(ISMULOP(ctx
-> token
))
1187 int token
= ctx
-> token
;
1188 oberon_read_token(ctx
);
1190 oberon_expr_t
* inter
= oberon_factor(ctx
);
1191 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1197 #define ISADDOP(x) \
1198 ((x) >= PLUS && (x) <= OR)
1200 static oberon_expr_t
*
1201 oberon_simple_expr(oberon_context_t
* ctx
)
1203 oberon_expr_t
* expr
;
1206 if(ctx
-> token
== PLUS
)
1209 oberon_assert_token(ctx
, PLUS
);
1211 else if(ctx
-> token
== MINUS
)
1214 oberon_assert_token(ctx
, MINUS
);
1217 expr
= oberon_term_expr(ctx
);
1218 while(ISADDOP(ctx
-> token
))
1220 int token
= ctx
-> token
;
1221 oberon_read_token(ctx
);
1223 oberon_expr_t
* inter
= oberon_term_expr(ctx
);
1224 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1229 expr
= oberon_make_unary_op(ctx
, MINUS
, expr
);
1235 #define ISRELATION(x) \
1236 ((x) >= EQUAL && (x) <= GEQ)
1238 static oberon_expr_t
*
1239 oberon_expr(oberon_context_t
* ctx
)
1241 oberon_expr_t
* expr
;
1243 expr
= oberon_simple_expr(ctx
);
1244 while(ISRELATION(ctx
-> token
))
1246 int token
= ctx
-> token
;
1247 oberon_read_token(ctx
);
1249 oberon_expr_t
* inter
= oberon_simple_expr(ctx
);
1250 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1256 static oberon_item_t
*
1257 oberon_const_expr(oberon_context_t
* ctx
)
1259 oberon_expr_t
* expr
;
1260 expr
= oberon_expr(ctx
);
1262 if(expr
-> is_item
== 0)
1264 oberon_error(ctx
, "const expression are required");
1267 return (oberon_item_t
*) expr
;
1270 // =======================================================================
1272 // =======================================================================
1274 static void oberon_decl_seq(oberon_context_t
* ctx
);
1275 static void oberon_statement_seq(oberon_context_t
* ctx
);
1276 static void oberon_initialize_decl(oberon_context_t
* ctx
);
1279 oberon_expect_token(oberon_context_t
* ctx
, int token
)
1281 if(ctx
-> token
!= token
)
1283 oberon_error(ctx
, "unexpected token %i (%i)", ctx
-> token
, token
);
1288 oberon_assert_token(oberon_context_t
* ctx
, int token
)
1290 oberon_expect_token(ctx
, token
);
1291 oberon_read_token(ctx
);
1295 oberon_assert_ident(oberon_context_t
* ctx
)
1297 oberon_expect_token(ctx
, IDENT
);
1298 char * ident
= ctx
-> string
;
1299 oberon_read_token(ctx
);
1304 oberon_var_decl(oberon_context_t
* ctx
)
1307 oberon_type_t
* type
;
1308 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1310 name
= oberon_assert_ident(ctx
);
1311 oberon_assert_token(ctx
, COLON
);
1312 oberon_type(ctx
, &type
);
1313 oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR
, name
, type
);
1316 static oberon_object_t
*
1317 oberon_make_param(oberon_context_t
* ctx
, int token
, char * name
, oberon_type_t
* type
)
1319 oberon_object_t
* param
;
1323 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR_PARAM
, name
, type
);
1325 else if(token
== IDENT
)
1327 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_PARAM
, name
, type
);
1331 oberon_error(ctx
, "oberon_make_param: wat");
1337 static oberon_object_t
*
1338 oberon_fp_section(oberon_context_t
* ctx
, int * num_decl
)
1340 int modifer_token
= ctx
-> token
;
1341 if(ctx
-> token
== VAR
)
1343 oberon_read_token(ctx
);
1347 name
= oberon_assert_ident(ctx
);
1349 oberon_assert_token(ctx
, COLON
);
1351 oberon_type_t
* type
;
1352 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1353 oberon_type(ctx
, &type
);
1355 oberon_object_t
* first
;
1356 first
= oberon_make_param(ctx
, modifer_token
, name
, type
);
1362 #define ISFPSECTION \
1363 ((ctx -> token == VAR) || (ctx -> token == IDENT))
1366 oberon_formal_pars(oberon_context_t
* ctx
, oberon_type_t
* signature
)
1368 oberon_assert_token(ctx
, LPAREN
);
1372 signature
-> decl
= oberon_fp_section(ctx
, &signature
-> num_decl
);
1373 while(ctx
-> token
== SEMICOLON
)
1375 oberon_assert_token(ctx
, SEMICOLON
);
1376 oberon_fp_section(ctx
, &signature
-> num_decl
);
1380 oberon_assert_token(ctx
, RPAREN
);
1382 if(ctx
-> token
== COLON
)
1384 oberon_assert_token(ctx
, COLON
);
1385 // TODO get by qualident
1386 oberon_type(ctx
, &signature
-> base
);
1391 oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
)
1393 oberon_type_t
* signature
;
1395 signature
-> class = OBERON_TYPE_PROCEDURE
;
1396 signature
-> num_decl
= 0;
1397 signature
-> base
= ctx
-> void_type
;
1398 signature
-> decl
= NULL
;
1400 if(ctx
-> token
== LPAREN
)
1402 oberon_formal_pars(ctx
, signature
);
1407 oberon_compare_signatures(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
)
1409 if(a
-> num_decl
!= b
-> num_decl
)
1411 oberon_error(ctx
, "number parameters not matched");
1414 int num_param
= a
-> num_decl
;
1415 oberon_object_t
* param_a
= a
-> decl
;
1416 oberon_object_t
* param_b
= b
-> decl
;
1417 for(int i
= 0; i
< num_param
; i
++)
1419 if(strcmp(param_a
-> name
, param_b
-> name
) != 0)
1421 oberon_error(ctx
, "param %i name not matched", i
+ 1);
1424 if(param_a
-> type
!= param_b
-> type
)
1426 oberon_error(ctx
, "param %i type not matched", i
+ 1);
1429 param_a
= param_a
-> next
;
1430 param_b
= param_b
-> next
;
1435 oberon_make_return(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1437 oberon_object_t
* proc
= ctx
-> decl
-> parent
;
1438 oberon_type_t
* result_type
= proc
-> type
-> base
;
1440 if(result_type
-> class == OBERON_TYPE_VOID
)
1444 oberon_error(ctx
, "procedure has no result type");
1451 oberon_error(ctx
, "procedure requires expression on result");
1454 oberon_autocast_to(ctx
, expr
, result_type
);
1457 proc
-> has_return
= 1;
1459 oberon_generate_return(ctx
, expr
);
1463 oberon_proc_decl_body(oberon_context_t
* ctx
, oberon_object_t
* proc
)
1465 oberon_assert_token(ctx
, SEMICOLON
);
1467 ctx
-> decl
= proc
-> scope
;
1469 oberon_decl_seq(ctx
);
1471 oberon_generate_begin_proc(ctx
, proc
);
1473 if(ctx
-> token
== BEGIN
)
1475 oberon_assert_token(ctx
, BEGIN
);
1476 oberon_statement_seq(ctx
);
1479 oberon_assert_token(ctx
, END
);
1480 char * name
= oberon_assert_ident(ctx
);
1481 if(strcmp(name
, proc
-> name
) != 0)
1483 oberon_error(ctx
, "procedure name not matched");
1486 if(proc
-> type
-> base
-> class == OBERON_TYPE_VOID
1487 && proc
-> has_return
== 0)
1489 oberon_make_return(ctx
, NULL
);
1492 if(proc
-> has_return
== 0)
1494 oberon_error(ctx
, "procedure requires return");
1497 oberon_generate_end_proc(ctx
);
1498 oberon_close_scope(ctx
-> decl
);
1502 oberon_proc_decl(oberon_context_t
* ctx
)
1504 oberon_assert_token(ctx
, PROCEDURE
);
1507 if(ctx
-> token
== UPARROW
)
1509 oberon_assert_token(ctx
, UPARROW
);
1514 name
= oberon_assert_ident(ctx
);
1516 oberon_scope_t
* proc_scope
;
1517 proc_scope
= oberon_open_scope(ctx
);
1518 ctx
-> decl
-> local
= 1;
1520 oberon_type_t
* signature
;
1521 signature
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1522 oberon_opt_formal_pars(ctx
, &signature
);
1524 oberon_initialize_decl(ctx
);
1525 oberon_generator_init_type(ctx
, signature
);
1526 oberon_close_scope(ctx
-> decl
);
1528 oberon_object_t
* proc
;
1529 proc
= oberon_find_object(ctx
-> decl
, name
, 0);
1532 if(proc
-> class != OBERON_CLASS_PROC
)
1534 oberon_error(ctx
, "mult definition");
1541 oberon_error(ctx
, "mult procedure definition");
1545 oberon_compare_signatures(ctx
, proc
-> type
, signature
);
1549 proc
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_PROC
);
1550 proc
-> type
= signature
;
1551 proc
-> scope
= proc_scope
;
1552 oberon_generator_init_proc(ctx
, proc
);
1555 proc
-> scope
-> parent
= proc
;
1560 oberon_proc_decl_body(ctx
, proc
);
1565 oberon_const_decl(oberon_context_t
* ctx
)
1568 oberon_item_t
* value
;
1569 oberon_object_t
* constant
;
1571 name
= oberon_assert_ident(ctx
);
1572 oberon_assert_token(ctx
, EQUAL
);
1573 value
= oberon_const_expr(ctx
);
1575 constant
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_CONST
);
1576 constant
-> value
= value
;
1580 oberon_make_array_type(oberon_context_t
* ctx
, oberon_expr_t
* size
, oberon_type_t
* base
, oberon_type_t
** type
)
1582 if(size
-> is_item
== 0)
1584 oberon_error(ctx
, "requires constant");
1587 if(size
-> item
.mode
!= MODE_INTEGER
)
1589 oberon_error(ctx
, "requires integer constant");
1592 oberon_type_t
* arr
;
1594 arr
-> class = OBERON_TYPE_ARRAY
;
1595 arr
-> size
= size
-> item
.integer
;
1600 oberon_field_list(oberon_context_t
* ctx
, oberon_type_t
* rec
)
1602 if(ctx
-> token
== IDENT
)
1605 oberon_type_t
* type
;
1606 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1608 name
= oberon_assert_ident(ctx
);
1609 oberon_assert_token(ctx
, COLON
);
1610 oberon_type(ctx
, &type
);
1611 oberon_define_field(ctx
, rec
, name
, type
);
1616 oberon_qualident_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1619 oberon_object_t
* to
;
1621 name
= oberon_assert_ident(ctx
);
1622 to
= oberon_find_object(ctx
-> decl
, name
, 0);
1626 if(to
-> class != OBERON_CLASS_TYPE
)
1628 oberon_error(ctx
, "not a type");
1633 to
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1634 to
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1640 static void oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
);
1643 * Правило граматики "type". Указатель type должен указывать на существующий объект!
1647 oberon_make_multiarray(oberon_context_t
* ctx
, oberon_expr_t
* sizes
, oberon_type_t
* base
, oberon_type_t
** type
)
1655 oberon_type_t
* dim
;
1656 dim
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1658 oberon_make_multiarray(ctx
, sizes
-> next
, base
, &dim
);
1660 oberon_make_array_type(ctx
, sizes
, dim
, type
);
1664 oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1666 if(ctx
-> token
== IDENT
)
1668 oberon_qualident_type(ctx
, type
);
1670 else if(ctx
-> token
== ARRAY
)
1672 oberon_assert_token(ctx
, ARRAY
);
1675 oberon_expr_t
* sizes
;
1676 oberon_expr_list(ctx
, &num_sizes
, &sizes
, 1);
1678 oberon_assert_token(ctx
, OF
);
1680 oberon_type_t
* base
;
1681 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1682 oberon_type(ctx
, &base
);
1684 oberon_make_multiarray(ctx
, sizes
, base
, type
);
1686 else if(ctx
-> token
== RECORD
)
1688 oberon_type_t
* rec
;
1690 rec
-> class = OBERON_TYPE_RECORD
;
1691 oberon_object_t
* list
= malloc(sizeof *list
);
1692 memset(list
, 0, sizeof *list
);
1693 rec
-> num_decl
= 0;
1697 oberon_assert_token(ctx
, RECORD
);
1698 oberon_field_list(ctx
, rec
);
1699 while(ctx
-> token
== SEMICOLON
)
1701 oberon_assert_token(ctx
, SEMICOLON
);
1702 oberon_field_list(ctx
, rec
);
1704 oberon_assert_token(ctx
, END
);
1706 rec
-> decl
= rec
-> decl
-> next
;
1709 else if(ctx
-> token
== POINTER
)
1711 oberon_assert_token(ctx
, POINTER
);
1712 oberon_assert_token(ctx
, TO
);
1714 oberon_type_t
* base
;
1715 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1716 oberon_type(ctx
, &base
);
1718 oberon_type_t
* ptr
;
1720 ptr
-> class = OBERON_TYPE_POINTER
;
1723 else if(ctx
-> token
== PROCEDURE
)
1725 oberon_open_scope(ctx
);
1726 oberon_assert_token(ctx
, PROCEDURE
);
1727 oberon_opt_formal_pars(ctx
, type
);
1728 oberon_close_scope(ctx
-> decl
);
1732 oberon_error(ctx
, "invalid type declaration");
1737 oberon_type_decl(oberon_context_t
* ctx
)
1740 oberon_object_t
* newtype
;
1741 oberon_type_t
* type
;
1743 name
= oberon_assert_ident(ctx
);
1745 newtype
= oberon_find_object(ctx
-> decl
, name
, 0);
1748 newtype
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1749 newtype
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1750 assert(newtype
-> type
);
1754 if(newtype
-> class != OBERON_CLASS_TYPE
)
1756 oberon_error(ctx
, "mult definition");
1759 if(newtype
-> linked
)
1761 oberon_error(ctx
, "mult definition - already linked");
1765 oberon_assert_token(ctx
, EQUAL
);
1767 type
= newtype
-> type
;
1768 oberon_type(ctx
, &type
);
1770 if(type
-> class == OBERON_TYPE_VOID
)
1772 oberon_error(ctx
, "recursive alias declaration");
1775 newtype
-> type
= type
;
1776 newtype
-> linked
= 1;
1779 static void oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1780 static void oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1783 oberon_prevent_recursive_pointer(oberon_context_t
* ctx
, oberon_type_t
* type
)
1785 if(type
-> class != OBERON_TYPE_POINTER
1786 && type
-> class != OBERON_TYPE_ARRAY
)
1791 if(type
-> recursive
)
1793 oberon_error(ctx
, "recursive pointer declaration");
1796 if(type
-> base
-> class == OBERON_TYPE_POINTER
)
1798 oberon_error(ctx
, "attempt to make pointer to pointer");
1801 type
-> recursive
= 1;
1803 oberon_prevent_recursive_pointer(ctx
, type
-> base
);
1805 type
-> recursive
= 0;
1809 oberon_prevent_recursive_record(oberon_context_t
* ctx
, oberon_type_t
* type
)
1811 if(type
-> class != OBERON_TYPE_RECORD
)
1816 if(type
-> recursive
)
1818 oberon_error(ctx
, "recursive record declaration");
1821 type
-> recursive
= 1;
1823 int num_fields
= type
-> num_decl
;
1824 oberon_object_t
* field
= type
-> decl
;
1825 for(int i
= 0; i
< num_fields
; i
++)
1827 oberon_prevent_recursive_object(ctx
, field
);
1828 field
= field
-> next
;
1831 type
-> recursive
= 0;
1834 oberon_prevent_recursive_procedure(oberon_context_t
* ctx
, oberon_type_t
* type
)
1836 if(type
-> class != OBERON_TYPE_PROCEDURE
)
1841 if(type
-> recursive
)
1843 oberon_error(ctx
, "recursive procedure declaration");
1846 type
-> recursive
= 1;
1848 int num_fields
= type
-> num_decl
;
1849 oberon_object_t
* field
= type
-> decl
;
1850 for(int i
= 0; i
< num_fields
; i
++)
1852 oberon_prevent_recursive_object(ctx
, field
);
1853 field
= field
-> next
;
1856 type
-> recursive
= 0;
1860 oberon_prevent_recursive_array(oberon_context_t
* ctx
, oberon_type_t
* type
)
1862 if(type
-> class != OBERON_TYPE_ARRAY
)
1867 if(type
-> recursive
)
1869 oberon_error(ctx
, "recursive array declaration");
1872 type
-> recursive
= 1;
1874 oberon_prevent_recursive_type(ctx
, type
-> base
);
1876 type
-> recursive
= 0;
1880 oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1882 if(type
-> class == OBERON_TYPE_POINTER
)
1884 oberon_prevent_recursive_pointer(ctx
, type
);
1886 else if(type
-> class == OBERON_TYPE_RECORD
)
1888 oberon_prevent_recursive_record(ctx
, type
);
1890 else if(type
-> class == OBERON_TYPE_ARRAY
)
1892 oberon_prevent_recursive_array(ctx
, type
);
1894 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1896 oberon_prevent_recursive_procedure(ctx
, type
);
1901 oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
1905 case OBERON_CLASS_VAR
:
1906 case OBERON_CLASS_TYPE
:
1907 case OBERON_CLASS_PARAM
:
1908 case OBERON_CLASS_VAR_PARAM
:
1909 case OBERON_CLASS_FIELD
:
1910 oberon_prevent_recursive_type(ctx
, x
-> type
);
1912 case OBERON_CLASS_CONST
:
1913 case OBERON_CLASS_PROC
:
1916 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
1922 oberon_prevent_recursive_decl(oberon_context_t
* ctx
)
1924 oberon_object_t
* x
= ctx
-> decl
-> list
-> next
;
1928 oberon_prevent_recursive_object(ctx
, x
);
1933 static void oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1934 static void oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1937 oberon_initialize_record_fields(oberon_context_t
* ctx
, oberon_type_t
* type
)
1939 if(type
-> class != OBERON_TYPE_RECORD
)
1944 int num_fields
= type
-> num_decl
;
1945 oberon_object_t
* field
= type
-> decl
;
1946 for(int i
= 0; i
< num_fields
; i
++)
1948 if(field
-> type
-> class == OBERON_TYPE_POINTER
)
1950 oberon_initialize_type(ctx
, field
-> type
);
1953 oberon_initialize_object(ctx
, field
);
1954 field
= field
-> next
;
1957 oberon_generator_init_record(ctx
, type
);
1961 oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1963 if(type
-> class == OBERON_TYPE_VOID
)
1965 oberon_error(ctx
, "undeclarated type");
1968 if(type
-> initialized
)
1973 type
-> initialized
= 1;
1975 if(type
-> class == OBERON_TYPE_POINTER
)
1977 oberon_initialize_type(ctx
, type
-> base
);
1978 oberon_generator_init_type(ctx
, type
);
1980 else if(type
-> class == OBERON_TYPE_ARRAY
)
1982 oberon_initialize_type(ctx
, type
-> base
);
1983 oberon_generator_init_type(ctx
, type
);
1985 else if(type
-> class == OBERON_TYPE_RECORD
)
1987 oberon_generator_init_type(ctx
, type
);
1988 oberon_initialize_record_fields(ctx
, type
);
1990 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1992 int num_fields
= type
-> num_decl
;
1993 oberon_object_t
* field
= type
-> decl
;
1994 for(int i
= 0; i
< num_fields
; i
++)
1996 oberon_initialize_object(ctx
, field
);
1997 field
= field
-> next
;
2000 oberon_generator_init_type(ctx
, type
);
2004 oberon_generator_init_type(ctx
, type
);
2009 oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
2011 if(x
-> initialized
)
2016 x
-> initialized
= 1;
2020 case OBERON_CLASS_TYPE
:
2021 oberon_initialize_type(ctx
, x
-> type
);
2023 case OBERON_CLASS_VAR
:
2024 case OBERON_CLASS_PARAM
:
2025 case OBERON_CLASS_VAR_PARAM
:
2026 case OBERON_CLASS_FIELD
:
2027 oberon_initialize_type(ctx
, x
-> type
);
2028 oberon_generator_init_var(ctx
, x
);
2030 case OBERON_CLASS_CONST
:
2031 case OBERON_CLASS_PROC
:
2034 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
2040 oberon_initialize_decl(oberon_context_t
* ctx
)
2042 oberon_object_t
* x
= ctx
-> decl
-> list
;
2046 oberon_initialize_object(ctx
, x
-> next
);
2052 oberon_prevent_undeclarated_procedures(oberon_context_t
* ctx
)
2054 oberon_object_t
* x
= ctx
-> decl
-> list
;
2058 if(x
-> next
-> class == OBERON_CLASS_PROC
)
2060 if(x
-> next
-> linked
== 0)
2062 oberon_error(ctx
, "unresolved forward declaration");
2070 oberon_decl_seq(oberon_context_t
* ctx
)
2072 if(ctx
-> token
== CONST
)
2074 oberon_assert_token(ctx
, CONST
);
2075 while(ctx
-> token
== IDENT
)
2077 oberon_const_decl(ctx
);
2078 oberon_assert_token(ctx
, SEMICOLON
);
2082 if(ctx
-> token
== TYPE
)
2084 oberon_assert_token(ctx
, TYPE
);
2085 while(ctx
-> token
== IDENT
)
2087 oberon_type_decl(ctx
);
2088 oberon_assert_token(ctx
, SEMICOLON
);
2092 if(ctx
-> token
== VAR
)
2094 oberon_assert_token(ctx
, VAR
);
2095 while(ctx
-> token
== IDENT
)
2097 oberon_var_decl(ctx
);
2098 oberon_assert_token(ctx
, SEMICOLON
);
2102 oberon_prevent_recursive_decl(ctx
);
2103 oberon_initialize_decl(ctx
);
2105 while(ctx
-> token
== PROCEDURE
)
2107 oberon_proc_decl(ctx
);
2108 oberon_assert_token(ctx
, SEMICOLON
);
2111 oberon_prevent_undeclarated_procedures(ctx
);
2115 oberon_assign(oberon_context_t
* ctx
, oberon_expr_t
* src
, oberon_expr_t
* dst
)
2117 oberon_autocast_to(ctx
, src
, dst
-> result
);
2118 oberon_generate_assign(ctx
, src
, dst
);
2122 oberon_make_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
2124 if(desig
-> result
-> class != OBERON_TYPE_VOID
)
2126 if(desig
-> result
-> class != OBERON_TYPE_PROCEDURE
)
2128 oberon_error(ctx
, "procedure with result");
2132 oberon_autocast_call(ctx
, desig
);
2133 oberon_generate_call_proc(ctx
, desig
);
2137 oberon_statement(oberon_context_t
* ctx
)
2139 oberon_expr_t
* item1
;
2140 oberon_expr_t
* item2
;
2142 if(ctx
-> token
== IDENT
)
2144 item1
= oberon_designator(ctx
);
2145 if(ctx
-> token
== ASSIGN
)
2147 oberon_assert_token(ctx
, ASSIGN
);
2148 item2
= oberon_expr(ctx
);
2149 oberon_assign(ctx
, item2
, item1
);
2153 item1
= oberon_opt_proc_parens(ctx
, item1
);
2154 oberon_make_call(ctx
, item1
);
2157 else if(ctx
-> token
== RETURN
)
2159 oberon_assert_token(ctx
, RETURN
);
2160 if(ISEXPR(ctx
-> token
))
2162 oberon_expr_t
* expr
;
2163 expr
= oberon_expr(ctx
);
2164 oberon_make_return(ctx
, expr
);
2168 oberon_make_return(ctx
, NULL
);
2174 oberon_statement_seq(oberon_context_t
* ctx
)
2176 oberon_statement(ctx
);
2177 while(ctx
-> token
== SEMICOLON
)
2179 oberon_assert_token(ctx
, SEMICOLON
);
2180 oberon_statement(ctx
);
2185 oberon_parse_module(oberon_context_t
* ctx
)
2187 char *name1
, *name2
;
2188 oberon_read_token(ctx
);
2190 oberon_assert_token(ctx
, MODULE
);
2191 name1
= oberon_assert_ident(ctx
);
2192 oberon_assert_token(ctx
, SEMICOLON
);
2193 ctx
-> mod
-> name
= name1
;
2195 oberon_decl_seq(ctx
);
2197 if(ctx
-> token
== BEGIN
)
2199 oberon_assert_token(ctx
, BEGIN
);
2200 oberon_generate_begin_module(ctx
);
2201 oberon_statement_seq(ctx
);
2202 oberon_generate_end_module(ctx
);
2205 oberon_assert_token(ctx
, END
);
2206 name2
= oberon_assert_ident(ctx
);
2207 oberon_assert_token(ctx
, DOT
);
2209 if(strcmp(name1
, name2
) != 0)
2211 oberon_error(ctx
, "module name not matched");
2215 // =======================================================================
2217 // =======================================================================
2220 register_default_types(oberon_context_t
* ctx
)
2222 ctx
-> void_type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2223 oberon_generator_init_type(ctx
, ctx
-> void_type
);
2225 ctx
-> void_ptr_type
= oberon_new_type_ptr(OBERON_TYPE_POINTER
);
2226 ctx
-> void_ptr_type
-> base
= ctx
-> void_type
;
2227 oberon_generator_init_type(ctx
, ctx
-> void_ptr_type
);
2229 ctx
-> int_type
= oberon_new_type_integer(sizeof(int));
2230 oberon_define_type(ctx
-> world_scope
, "INTEGER", ctx
-> int_type
);
2232 ctx
-> bool_type
= oberon_new_type_boolean(sizeof(int));
2233 oberon_define_type(ctx
-> world_scope
, "BOOLEAN", ctx
-> bool_type
);
2237 oberon_create_context()
2239 oberon_context_t
* ctx
= malloc(sizeof *ctx
);
2240 memset(ctx
, 0, sizeof *ctx
);
2242 oberon_scope_t
* world_scope
;
2243 world_scope
= oberon_open_scope(ctx
);
2244 ctx
-> world_scope
= world_scope
;
2246 oberon_generator_init_context(ctx
);
2248 register_default_types(ctx
);
2254 oberon_destroy_context(oberon_context_t
* ctx
)
2256 oberon_generator_destroy_context(ctx
);
2261 oberon_compile_module(oberon_context_t
* ctx
, const char * code
)
2263 oberon_module_t
* mod
= malloc(sizeof *mod
);
2264 memset(mod
, 0, sizeof *mod
);
2267 oberon_scope_t
* module_scope
;
2268 module_scope
= oberon_open_scope(ctx
);
2269 mod
-> decl
= module_scope
;
2271 oberon_init_scaner(ctx
, code
);
2272 oberon_parse_module(ctx
);
2274 oberon_generate_code(ctx
);