dfed94a274ad3991d56ab8adf5223fabac446e38
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
;
126 oberon_close_scope(oberon_scope_t
* scope
)
128 oberon_context_t
* ctx
= scope
-> ctx
;
129 ctx
-> decl
= scope
-> up
;
132 static oberon_object_t
*
133 oberon_define_object(oberon_scope_t
* scope
, char * name
, int class)
135 oberon_object_t
* x
= scope
-> list
;
136 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
143 oberon_error(scope
-> ctx
, "already defined");
146 oberon_object_t
* newvar
= malloc(sizeof *newvar
);
147 memset(newvar
, 0, sizeof *newvar
);
148 newvar
-> name
= name
;
149 newvar
-> class = class;
157 oberon_define_field(oberon_context_t
* ctx
, oberon_type_t
* rec
, char * name
, oberon_type_t
* type
)
159 oberon_object_t
* x
= rec
-> decl
;
160 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
167 oberon_error(ctx
, "multiple definition");
170 oberon_object_t
* field
= malloc(sizeof *field
);
171 memset(field
, 0, sizeof *field
);
172 field
-> name
= name
;
173 field
-> class = OBERON_CLASS_FIELD
;
174 field
-> type
= type
;
176 rec
-> num_decl
+= 1;
180 static oberon_object_t
*
181 oberon_find_object_in_list(oberon_object_t
* list
, char * name
)
183 oberon_object_t
* x
= list
;
184 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
191 static oberon_object_t
*
192 oberon_find_object(oberon_scope_t
* scope
, char * name
, int check_it
)
194 oberon_object_t
* result
= NULL
;
196 oberon_scope_t
* s
= scope
;
197 while(result
== NULL
&& s
!= NULL
)
199 result
= oberon_find_object_in_list(s
-> list
, name
);
203 if(check_it
&& result
== NULL
)
205 oberon_error(scope
-> ctx
, "undefined ident %s", name
);
211 static oberon_object_t
*
212 oberon_find_field(oberon_context_t
* ctx
, oberon_type_t
* rec
, char * name
)
214 oberon_object_t
* x
= rec
-> decl
;
215 for(int i
= 0; i
< rec
-> num_decl
; i
++)
217 if(strcmp(x
-> name
, name
) == 0)
224 oberon_error(ctx
, "field not defined");
229 static oberon_object_t
*
230 oberon_define_type(oberon_scope_t
* scope
, char * name
, oberon_type_t
* type
)
232 oberon_object_t
* id
;
233 id
= oberon_define_object(scope
, name
, OBERON_CLASS_TYPE
);
235 oberon_generator_init_type(scope
-> ctx
, type
);
240 static oberon_type_t *
241 oberon_find_type(oberon_scope_t * scope, char * name)
243 oberon_object_t * x = oberon_find_object(scope, name);
244 if(x -> class != OBERON_CLASS_TYPE)
246 oberon_error(scope -> ctx, "%s not a type", name);
253 static oberon_object_t
*
254 oberon_define_var(oberon_scope_t
* scope
, int class, char * name
, oberon_type_t
* type
)
256 oberon_object_t
* var
;
257 var
= oberon_define_object(scope
, name
, class);
263 static oberon_object_t *
264 oberon_find_var(oberon_scope_t * scope, char * name)
266 oberon_object_t * x = oberon_find_object(scope, name);
268 if(x -> class != OBERON_CLASS_VAR)
270 oberon_error(scope -> ctx, "%s not a var", name);
277 static oberon_object_t
*
278 oberon_define_proc(oberon_scope_t
* scope
, char * name
, oberon_type_t
* signature
)
280 oberon_object_t
* proc
;
281 proc
= oberon_define_object(scope
, name
, OBERON_CLASS_PROC
);
282 proc
-> type
= signature
;
286 // =======================================================================
288 // =======================================================================
291 oberon_get_char(oberon_context_t
* ctx
)
293 ctx
-> code_index
+= 1;
294 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
298 oberon_init_scaner(oberon_context_t
* ctx
, const char * code
)
301 ctx
-> code_index
= 0;
302 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
306 oberon_read_ident(oberon_context_t
* ctx
)
309 int i
= ctx
-> code_index
;
311 int c
= ctx
-> code
[i
];
319 char * ident
= malloc(len
+ 1);
320 memcpy(ident
, &ctx
->code
[ctx
->code_index
], len
);
323 ctx
-> code_index
= i
;
324 ctx
-> c
= ctx
-> code
[i
];
325 ctx
-> string
= ident
;
326 ctx
-> token
= IDENT
;
328 if(strcmp(ident
, "MODULE") == 0)
330 ctx
-> token
= MODULE
;
332 else if(strcmp(ident
, "END") == 0)
336 else if(strcmp(ident
, "VAR") == 0)
340 else if(strcmp(ident
, "BEGIN") == 0)
342 ctx
-> token
= BEGIN
;
344 else if(strcmp(ident
, "TRUE") == 0)
348 else if(strcmp(ident
, "FALSE") == 0)
350 ctx
-> token
= FALSE
;
352 else if(strcmp(ident
, "OR") == 0)
356 else if(strcmp(ident
, "DIV") == 0)
360 else if(strcmp(ident
, "MOD") == 0)
364 else if(strcmp(ident
, "PROCEDURE") == 0)
366 ctx
-> token
= PROCEDURE
;
368 else if(strcmp(ident
, "RETURN") == 0)
370 ctx
-> token
= RETURN
;
372 else if(strcmp(ident
, "CONST") == 0)
374 ctx
-> token
= CONST
;
376 else if(strcmp(ident
, "TYPE") == 0)
380 else if(strcmp(ident
, "ARRAY") == 0)
382 ctx
-> token
= ARRAY
;
384 else if(strcmp(ident
, "OF") == 0)
388 else if(strcmp(ident
, "RECORD") == 0)
390 ctx
-> token
= RECORD
;
392 else if(strcmp(ident
, "POINTER") == 0)
394 ctx
-> token
= POINTER
;
396 else if(strcmp(ident
, "TO") == 0)
400 else if(strcmp(ident
, "NIL") == 0)
407 oberon_read_integer(oberon_context_t
* ctx
)
410 int i
= ctx
-> code_index
;
412 int c
= ctx
-> code
[i
];
420 char * ident
= malloc(len
+ 2);
421 memcpy(ident
, &ctx
->code
[ctx
->code_index
], len
);
424 ctx
-> code_index
= i
;
425 ctx
-> c
= ctx
-> code
[i
];
426 ctx
-> string
= ident
;
427 ctx
-> integer
= atoi(ident
);
428 ctx
-> token
= INTEGER
;
432 oberon_skip_space(oberon_context_t
* ctx
)
434 while(isspace(ctx
-> c
))
436 oberon_get_char(ctx
);
441 oberon_read_symbol(oberon_context_t
* ctx
)
450 ctx
-> token
= SEMICOLON
;
451 oberon_get_char(ctx
);
454 ctx
-> token
= COLON
;
455 oberon_get_char(ctx
);
458 ctx
-> token
= ASSIGN
;
459 oberon_get_char(ctx
);
464 oberon_get_char(ctx
);
467 ctx
-> token
= LPAREN
;
468 oberon_get_char(ctx
);
471 ctx
-> token
= RPAREN
;
472 oberon_get_char(ctx
);
475 ctx
-> token
= EQUAL
;
476 oberon_get_char(ctx
);
480 oberon_get_char(ctx
);
484 oberon_get_char(ctx
);
488 oberon_get_char(ctx
);
492 ctx
-> token
= GREAT
;
493 oberon_get_char(ctx
);
497 oberon_get_char(ctx
);
502 oberon_get_char(ctx
);
505 ctx
-> token
= MINUS
;
506 oberon_get_char(ctx
);
510 oberon_get_char(ctx
);
513 ctx
-> token
= SLASH
;
514 oberon_get_char(ctx
);
518 oberon_get_char(ctx
);
522 oberon_get_char(ctx
);
525 ctx
-> token
= COMMA
;
526 oberon_get_char(ctx
);
529 ctx
-> token
= LBRACE
;
530 oberon_get_char(ctx
);
533 ctx
-> token
= RBRACE
;
534 oberon_get_char(ctx
);
537 ctx
-> token
= UPARROW
;
538 oberon_get_char(ctx
);
541 oberon_error(ctx
, "invalid char");
547 oberon_read_token(oberon_context_t
* ctx
)
549 oberon_skip_space(ctx
);
554 oberon_read_ident(ctx
);
558 oberon_read_integer(ctx
);
562 oberon_read_symbol(ctx
);
566 // =======================================================================
568 // =======================================================================
570 static void oberon_expect_token(oberon_context_t
* ctx
, int token
);
571 static oberon_expr_t
* oberon_expr(oberon_context_t
* ctx
);
572 static void oberon_assert_token(oberon_context_t
* ctx
, int token
);
573 static char * oberon_assert_ident(oberon_context_t
* ctx
);
574 static void oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
);
576 static oberon_expr_t
*
577 oberon_new_operator(int op
, oberon_type_t
* result
, oberon_expr_t
* left
, oberon_expr_t
* right
)
579 oberon_oper_t
* operator;
580 operator = malloc(sizeof *operator);
581 memset(operator, 0, sizeof *operator);
583 operator -> is_item
= 0;
584 operator -> result
= result
;
586 operator -> left
= left
;
587 operator -> right
= right
;
589 return (oberon_expr_t
*) operator;
592 static oberon_expr_t
*
593 oberon_new_item(int mode
, oberon_type_t
* result
)
595 oberon_item_t
* item
;
596 item
= malloc(sizeof *item
);
597 memset(item
, 0, sizeof *item
);
600 item
-> result
= result
;
603 return (oberon_expr_t
*)item
;
606 static oberon_expr_t
*
607 oberon_make_unary_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
)
609 oberon_expr_t
* expr
;
610 oberon_type_t
* result
;
612 result
= a
-> result
;
616 if(result
-> class != OBERON_TYPE_INTEGER
)
618 oberon_error(ctx
, "incompatible operator type");
621 expr
= oberon_new_operator(OP_UNARY_MINUS
, result
, a
, NULL
);
623 else if(token
== NOT
)
625 if(result
-> class != OBERON_TYPE_BOOLEAN
)
627 oberon_error(ctx
, "incompatible operator type");
630 expr
= oberon_new_operator(OP_LOGIC_NOT
, result
, a
, NULL
);
634 oberon_error(ctx
, "oberon_make_unary_op: wat");
641 oberon_expr_list(oberon_context_t
* ctx
, int * num_expr
, oberon_expr_t
** first
)
643 oberon_expr_t
* last
;
646 *first
= last
= oberon_expr(ctx
);
647 while(ctx
-> token
== COMMA
)
649 oberon_assert_token(ctx
, COMMA
);
650 oberon_expr_t
* current
;
651 current
= oberon_expr(ctx
);
652 last
-> next
= current
;
658 static oberon_expr_t
*
659 oberon_autocast_to(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* pref
)
661 if(pref
-> class != expr
-> result
-> class)
663 oberon_error(ctx
, "incompatible types");
667 if(pref
-> class == OBERON_TYPE_INTEGER
)
669 if(expr
-> result
-> class > pref
-> class)
671 oberon_error(ctx
, "incompatible size");
674 else if(pref
-> class == OBERON_TYPE_RECORD
)
676 if(expr
-> result
!= pref
)
678 printf("oberon_autocast_to: rec %p != %p\n", expr
-> result
, pref
);
679 oberon_error(ctx
, "incompatible record types");
689 oberon_autocast_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
691 if(desig
-> is_item
== 0)
693 oberon_error(ctx
, "expected item");
696 if(desig
-> item
.mode
!= MODE_CALL
)
698 oberon_error(ctx
, "expected mode CALL");
701 if(desig
-> item
.var
-> class != OBERON_CLASS_PROC
)
703 oberon_error(ctx
, "only procedures can be called");
706 oberon_type_t
* fn
= desig
-> item
.var
-> type
;
707 int num_args
= desig
-> item
.num_args
;
708 int num_decl
= fn
-> num_decl
;
710 if(num_args
< num_decl
)
712 oberon_error(ctx
, "too few arguments");
714 else if(num_args
> num_decl
)
716 oberon_error(ctx
, "too many arguments");
719 oberon_expr_t
* arg
= desig
-> item
.args
;
720 oberon_object_t
* param
= fn
-> decl
;
721 for(int i
= 0; i
< num_args
; i
++)
723 oberon_autocast_to(ctx
, arg
, param
-> type
);
725 param
= param
-> next
;
733 || ((x) == INTEGER) \
739 static oberon_expr_t
*
740 oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
742 if(expr
-> result
-> class != OBERON_TYPE_POINTER
)
744 oberon_error(ctx
, "not a pointer");
747 assert(expr
-> is_item
);
749 oberon_expr_t
* selector
;
750 selector
= oberon_new_item(MODE_DEREF
, expr
-> result
-> base
);
751 selector
-> item
.parent
= (oberon_item_t
*) expr
;
756 static oberon_expr_t
*
757 oberon_make_array_selector(oberon_context_t
* ctx
, oberon_expr_t
* desig
, int num_indexes
, oberon_expr_t
* indexes
)
759 if(desig
-> result
-> class == OBERON_TYPE_POINTER
)
761 desig
= oberno_make_dereferencing(ctx
, desig
);
764 assert(desig
-> is_item
);
766 if(desig
-> result
-> class != OBERON_TYPE_ARRAY
)
768 oberon_error(ctx
, "not array");
771 oberon_type_t
* base
;
772 base
= desig
-> result
-> base
;
776 oberon_expr_t
* selector
;
777 selector
= oberon_new_item(MODE_INDEX
, base
);
778 selector
-> item
.parent
= (oberon_item_t
*) desig
;
779 selector
-> item
.num_args
= num_indexes
;
780 selector
-> item
.args
= indexes
;
785 static oberon_expr_t
*
786 oberon_make_record_selector(oberon_context_t
* ctx
, oberon_expr_t
* expr
, char * name
)
788 if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
790 expr
= oberno_make_dereferencing(ctx
, expr
);
793 assert(expr
-> is_item
== 1);
795 if(expr
-> result
-> class != OBERON_TYPE_RECORD
)
797 oberon_error(ctx
, "not record");
800 oberon_type_t
* rec
= expr
-> result
;
802 oberon_object_t
* field
;
803 field
= oberon_find_field(ctx
, rec
, name
);
805 oberon_expr_t
* selector
;
806 selector
= oberon_new_item(MODE_FIELD
, field
-> type
);
807 selector
-> item
.var
= field
;
808 selector
-> item
.parent
= (oberon_item_t
*) expr
;
813 #define ISSELECTOR(x) \
818 static oberon_expr_t
*
819 oberon_designator(oberon_context_t
* ctx
)
822 oberon_object_t
* var
;
823 oberon_expr_t
* expr
;
825 name
= oberon_assert_ident(ctx
);
826 var
= oberon_find_object(ctx
-> decl
, name
, 1);
830 case OBERON_CLASS_CONST
:
832 expr
= (oberon_expr_t
*) var
-> value
;
834 case OBERON_CLASS_VAR
:
835 case OBERON_CLASS_VAR_PARAM
:
836 case OBERON_CLASS_PARAM
:
837 expr
= oberon_new_item(MODE_VAR
, var
-> type
);
839 case OBERON_CLASS_PROC
:
840 expr
= oberon_new_item(MODE_CALL
, var
-> type
);
843 oberon_error(ctx
, "invalid designator");
846 expr
-> item
.var
= var
;
848 while(ISSELECTOR(ctx
-> token
))
853 oberon_assert_token(ctx
, DOT
);
854 name
= oberon_assert_ident(ctx
);
855 expr
= oberon_make_record_selector(ctx
, expr
, name
);
858 oberon_assert_token(ctx
, LBRACE
);
860 oberon_expr_t
* indexes
= NULL
;
861 oberon_expr_list(ctx
, &num_indexes
, &indexes
);
862 oberon_assert_token(ctx
, RBRACE
);
863 expr
= oberon_make_array_selector(ctx
, expr
, num_indexes
, indexes
);
866 oberon_assert_token(ctx
, UPARROW
);
867 expr
= oberno_make_dereferencing(ctx
, expr
);
870 oberon_error(ctx
, "oberon_designator: wat");
877 static oberon_expr_t
*
878 oberon_opt_proc_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
880 assert(expr
-> is_item
== 1);
882 if(ctx
-> token
== LPAREN
)
884 if(expr
-> result
-> class != OBERON_TYPE_PROCEDURE
)
886 oberon_error(ctx
, "not a procedure");
889 oberon_assert_token(ctx
, LPAREN
);
892 oberon_expr_t
* arguments
= NULL
;
894 if(ISEXPR(ctx
-> token
))
896 oberon_expr_list(ctx
, &num_args
, &arguments
);
899 expr
-> result
= expr
-> item
.var
-> type
-> base
;
900 expr
-> item
.mode
= MODE_CALL
;
901 expr
-> item
.num_args
= num_args
;
902 expr
-> item
.args
= arguments
;
903 oberon_assert_token(ctx
, RPAREN
);
905 oberon_autocast_call(ctx
, expr
);
911 static oberon_expr_t
*
912 oberon_factor(oberon_context_t
* ctx
)
914 oberon_expr_t
* expr
;
919 expr
= oberon_designator(ctx
);
920 expr
= oberon_opt_proc_parens(ctx
, expr
);
923 expr
= oberon_new_item(MODE_INTEGER
, ctx
-> int_type
);
924 expr
-> item
.integer
= ctx
-> integer
;
925 oberon_assert_token(ctx
, INTEGER
);
928 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
929 expr
-> item
.boolean
= 1;
930 oberon_assert_token(ctx
, TRUE
);
933 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
934 expr
-> item
.boolean
= 0;
935 oberon_assert_token(ctx
, FALSE
);
938 oberon_assert_token(ctx
, LPAREN
);
939 expr
= oberon_expr(ctx
);
940 oberon_assert_token(ctx
, RPAREN
);
943 oberon_assert_token(ctx
, NOT
);
944 expr
= oberon_factor(ctx
);
945 expr
= oberon_make_unary_op(ctx
, NOT
, expr
);
948 oberon_assert_token(ctx
, NIL
);
949 expr
= oberon_new_item(MODE_NIL
, ctx
-> void_ptr_type
);
952 oberon_error(ctx
, "invalid expression");
959 * oberon_autocast_binary_op автоматически переобразовывеат тип по след. правилам:
960 * 1. Классы обоих типов должны быть одинаковы
961 * 2. В качестве результата должен быть выбран больший тип.
962 * 3. Если размер результат не должен быть меньше чем базовый int
966 oberon_autocast_binary_op(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
, oberon_type_t
** result
)
968 if((a
-> class) != (b
-> class))
970 oberon_error(ctx
, "incompatible types");
973 if((a
-> size
) > (b
-> size
))
982 if(((*result
) -> class) == OBERON_TYPE_INTEGER
)
984 if(((*result
) -> size
) < (ctx
-> int_type
-> size
))
986 *result
= ctx
-> int_type
;
990 /* TODO: cast types */
993 #define ITMAKESBOOLEAN(x) \
994 (((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
996 #define ITUSEONLYINTEGER(x) \
997 ((x) >= LESS && (x) <= GEQ)
999 #define ITUSEONLYBOOLEAN(x) \
1000 (((x) == OR) || ((x) == AND))
1002 static oberon_expr_t
*
1003 oberon_make_bin_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
, oberon_expr_t
* b
)
1005 oberon_expr_t
* expr
;
1006 oberon_type_t
* result
;
1008 if(ITMAKESBOOLEAN(token
))
1010 if(ITUSEONLYINTEGER(token
))
1012 if(a
-> result
-> class != OBERON_TYPE_INTEGER
1013 || b
-> result
-> class != OBERON_TYPE_INTEGER
)
1015 oberon_error(ctx
, "used only with integer types");
1018 else if(ITUSEONLYBOOLEAN(token
))
1020 if(a
-> result
-> class != OBERON_TYPE_BOOLEAN
1021 || b
-> result
-> class != OBERON_TYPE_BOOLEAN
)
1023 oberon_error(ctx
, "used only with boolean type");
1027 result
= ctx
-> bool_type
;
1031 expr
= oberon_new_operator(OP_EQ
, result
, a
, b
);
1033 else if(token
== NEQ
)
1035 expr
= oberon_new_operator(OP_NEQ
, result
, a
, b
);
1037 else if(token
== LESS
)
1039 expr
= oberon_new_operator(OP_LSS
, result
, a
, b
);
1041 else if(token
== LEQ
)
1043 expr
= oberon_new_operator(OP_LEQ
, result
, a
, b
);
1045 else if(token
== GREAT
)
1047 expr
= oberon_new_operator(OP_GRT
, result
, a
, b
);
1049 else if(token
== GEQ
)
1051 expr
= oberon_new_operator(OP_GEQ
, result
, a
, b
);
1053 else if(token
== OR
)
1055 expr
= oberon_new_operator(OP_LOGIC_OR
, result
, a
, b
);
1057 else if(token
== AND
)
1059 expr
= oberon_new_operator(OP_LOGIC_AND
, result
, a
, b
);
1063 oberon_error(ctx
, "oberon_make_bin_op: bool wat");
1068 oberon_autocast_binary_op(ctx
, a
-> result
, b
-> result
, &result
);
1072 expr
= oberon_new_operator(OP_ADD
, result
, a
, b
);
1074 else if(token
== MINUS
)
1076 expr
= oberon_new_operator(OP_SUB
, result
, a
, b
);
1078 else if(token
== STAR
)
1080 expr
= oberon_new_operator(OP_MUL
, result
, a
, b
);
1082 else if(token
== SLASH
)
1084 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1086 else if(token
== DIV
)
1088 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1090 else if(token
== MOD
)
1092 expr
= oberon_new_operator(OP_MOD
, result
, a
, b
);
1096 oberon_error(ctx
, "oberon_make_bin_op: bin wat");
1103 #define ISMULOP(x) \
1104 ((x) >= STAR && (x) <= AND)
1106 static oberon_expr_t
*
1107 oberon_term_expr(oberon_context_t
* ctx
)
1109 oberon_expr_t
* expr
;
1111 expr
= oberon_factor(ctx
);
1112 while(ISMULOP(ctx
-> token
))
1114 int token
= ctx
-> token
;
1115 oberon_read_token(ctx
);
1117 oberon_expr_t
* inter
= oberon_factor(ctx
);
1118 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1124 #define ISADDOP(x) \
1125 ((x) >= PLUS && (x) <= OR)
1127 static oberon_expr_t
*
1128 oberon_simple_expr(oberon_context_t
* ctx
)
1130 oberon_expr_t
* expr
;
1133 if(ctx
-> token
== PLUS
)
1136 oberon_assert_token(ctx
, PLUS
);
1138 else if(ctx
-> token
== MINUS
)
1141 oberon_assert_token(ctx
, MINUS
);
1144 expr
= oberon_term_expr(ctx
);
1145 while(ISADDOP(ctx
-> token
))
1147 int token
= ctx
-> token
;
1148 oberon_read_token(ctx
);
1150 oberon_expr_t
* inter
= oberon_term_expr(ctx
);
1151 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1156 expr
= oberon_make_unary_op(ctx
, MINUS
, expr
);
1162 #define ISRELATION(x) \
1163 ((x) >= EQUAL && (x) <= GEQ)
1165 static oberon_expr_t
*
1166 oberon_expr(oberon_context_t
* ctx
)
1168 oberon_expr_t
* expr
;
1170 expr
= oberon_simple_expr(ctx
);
1171 while(ISRELATION(ctx
-> token
))
1173 int token
= ctx
-> token
;
1174 oberon_read_token(ctx
);
1176 oberon_expr_t
* inter
= oberon_simple_expr(ctx
);
1177 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1183 static oberon_item_t
*
1184 oberon_const_expr(oberon_context_t
* ctx
)
1186 oberon_expr_t
* expr
;
1187 expr
= oberon_expr(ctx
);
1189 if(expr
-> is_item
== 0)
1191 oberon_error(ctx
, "const expression are required");
1194 return (oberon_item_t
*) expr
;
1197 // =======================================================================
1199 // =======================================================================
1201 static void oberon_statement_seq(oberon_context_t
* ctx
);
1204 oberon_expect_token(oberon_context_t
* ctx
, int token
)
1206 if(ctx
-> token
!= token
)
1208 oberon_error(ctx
, "unexpected token %i (%i)", ctx
-> token
, token
);
1213 oberon_assert_token(oberon_context_t
* ctx
, int token
)
1215 oberon_expect_token(ctx
, token
);
1216 oberon_read_token(ctx
);
1220 oberon_assert_ident(oberon_context_t
* ctx
)
1222 oberon_expect_token(ctx
, IDENT
);
1223 char * ident
= ctx
-> string
;
1224 oberon_read_token(ctx
);
1229 oberon_var_decl(oberon_context_t
* ctx
)
1232 oberon_type_t
* type
;
1233 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1235 name
= oberon_assert_ident(ctx
);
1236 oberon_assert_token(ctx
, COLON
);
1237 oberon_type(ctx
, &type
);
1238 oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR
, name
, type
);
1241 static oberon_object_t
*
1242 oberon_make_param(oberon_context_t
* ctx
, int token
, char * name
, oberon_type_t
* type
)
1244 oberon_object_t
* param
;
1248 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR_PARAM
, name
, type
);
1250 else if(token
== IDENT
)
1252 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_PARAM
, name
, type
);
1256 oberon_error(ctx
, "oberon_make_param: wat");
1262 static oberon_object_t
*
1263 oberon_fp_section(oberon_context_t
* ctx
, int * num_decl
)
1265 int modifer_token
= ctx
-> token
;
1266 if(ctx
-> token
== VAR
)
1268 oberon_read_token(ctx
);
1272 name
= oberon_assert_ident(ctx
);
1274 oberon_assert_token(ctx
, COLON
);
1276 oberon_type_t
* type
;
1277 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1278 oberon_type(ctx
, &type
);
1280 oberon_object_t
* first
;
1281 first
= oberon_make_param(ctx
, modifer_token
, name
, type
);
1287 #define ISFPSECTION \
1288 ((ctx -> token == VAR) || (ctx -> token == IDENT))
1291 oberon_formal_pars(oberon_context_t
* ctx
, oberon_type_t
* signature
)
1293 oberon_assert_token(ctx
, LPAREN
);
1297 signature
-> decl
= oberon_fp_section(ctx
, &signature
-> num_decl
);
1298 while(ctx
-> token
== SEMICOLON
)
1300 oberon_assert_token(ctx
, SEMICOLON
);
1301 oberon_fp_section(ctx
, &signature
-> num_decl
);
1305 oberon_assert_token(ctx
, RPAREN
);
1307 if(ctx
-> token
== COLON
)
1309 oberon_assert_token(ctx
, COLON
);
1310 oberon_type(ctx
, &signature
-> base
);
1315 oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
)
1317 oberon_type_t
* signature
;
1319 signature
-> class = OBERON_TYPE_PROCEDURE
;
1320 signature
-> num_decl
= 0;
1321 signature
-> base
= ctx
-> void_type
;
1322 signature
-> decl
= NULL
;
1324 if(ctx
-> token
== LPAREN
)
1326 oberon_formal_pars(ctx
, signature
);
1331 oberon_make_return(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1333 if(ctx
-> result_type
-> class == OBERON_TYPE_VOID
)
1337 oberon_error(ctx
, "procedure has no result type");
1344 oberon_error(ctx
, "procedure requires expression on result");
1347 oberon_autocast_to(ctx
, expr
, ctx
-> result_type
);
1350 ctx
-> has_return
= 1;
1352 oberon_generate_return(ctx
, expr
);
1356 oberon_proc_decl(oberon_context_t
* ctx
)
1358 oberon_assert_token(ctx
, PROCEDURE
);
1361 name
= oberon_assert_ident(ctx
);
1363 oberon_scope_t
* this_proc_def_scope
= ctx
-> decl
;
1364 oberon_open_scope(ctx
);
1366 oberon_type_t
* signature
;
1367 signature
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1368 oberon_opt_formal_pars(ctx
, &signature
);
1370 oberon_object_t
* proc
;
1371 proc
= oberon_define_proc(this_proc_def_scope
, name
, signature
);
1373 ctx
-> result_type
= signature
-> base
;
1374 ctx
-> has_return
= 0;
1376 oberon_assert_token(ctx
, SEMICOLON
);
1378 oberon_generate_begin_proc(ctx
, proc
);
1380 // TODO declarations
1382 if(ctx
-> token
== BEGIN
)
1384 oberon_assert_token(ctx
, BEGIN
);
1385 oberon_statement_seq(ctx
);
1388 oberon_assert_token(ctx
, END
);
1389 char * name2
= oberon_assert_ident(ctx
);
1390 if(strcmp(name2
, name
) != 0)
1392 oberon_error(ctx
, "procedure name not matched");
1395 if(signature
-> base
-> class == OBERON_TYPE_VOID
)
1397 oberon_make_return(ctx
, NULL
);
1400 if(ctx
-> has_return
== 0)
1402 oberon_error(ctx
, "procedure requires return");
1404 ctx
-> result_type
= NULL
;
1406 oberon_generate_end_proc(ctx
);
1407 oberon_close_scope(ctx
-> decl
);
1411 oberon_const_decl(oberon_context_t
* ctx
)
1414 oberon_item_t
* value
;
1415 oberon_object_t
* constant
;
1417 name
= oberon_assert_ident(ctx
);
1418 oberon_assert_token(ctx
, EQUAL
);
1419 value
= oberon_const_expr(ctx
);
1421 constant
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_CONST
);
1422 constant
-> value
= value
;
1426 oberon_make_array_type(oberon_context_t
* ctx
, oberon_item_t
* size
, oberon_type_t
* base
, oberon_type_t
** type
)
1428 if(size
-> mode
!= MODE_INTEGER
)
1430 oberon_error(ctx
, "requires integer constant");
1433 oberon_type_t
* arr
;
1435 arr
-> class = OBERON_TYPE_ARRAY
;
1436 arr
-> size
= size
-> integer
;
1441 oberon_field_list(oberon_context_t
* ctx
, oberon_type_t
* rec
)
1443 if(ctx
-> token
== IDENT
)
1446 oberon_type_t
* type
;
1447 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1449 name
= oberon_assert_ident(ctx
);
1450 oberon_assert_token(ctx
, COLON
);
1451 oberon_type(ctx
, &type
);
1452 oberon_define_field(ctx
, rec
, name
, type
);
1457 oberon_qualident_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1460 oberon_object_t
* to
;
1462 name
= oberon_assert_ident(ctx
);
1463 to
= oberon_find_object(ctx
-> decl
, name
, 0);
1467 if(to
-> class != OBERON_CLASS_TYPE
)
1469 oberon_error(ctx
, "not a type");
1474 to
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1475 to
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1481 static void oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
);
1484 * Правило граматики "type". Указатель type должен указывать на существующий объект!
1488 oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1490 if(ctx
-> token
== IDENT
)
1492 oberon_qualident_type(ctx
, type
);
1494 else if(ctx
-> token
== ARRAY
)
1496 oberon_assert_token(ctx
, ARRAY
);
1498 oberon_item_t
* size
;
1499 size
= oberon_const_expr(ctx
);
1501 oberon_assert_token(ctx
, OF
);
1503 oberon_type_t
* base
;
1504 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1505 oberon_type(ctx
, &base
);
1507 oberon_make_array_type(ctx
, size
, base
, type
);
1509 else if(ctx
-> token
== RECORD
)
1511 oberon_type_t
* rec
;
1513 rec
-> class = OBERON_TYPE_RECORD
;
1514 oberon_object_t
* list
= malloc(sizeof *list
);
1515 memset(list
, 0, sizeof *list
);
1516 rec
-> num_decl
= 0;
1520 oberon_assert_token(ctx
, RECORD
);
1521 oberon_field_list(ctx
, rec
);
1522 while(ctx
-> token
== SEMICOLON
)
1524 oberon_assert_token(ctx
, SEMICOLON
);
1525 oberon_field_list(ctx
, rec
);
1527 oberon_assert_token(ctx
, END
);
1529 rec
-> decl
= rec
-> decl
-> next
;
1532 else if(ctx
-> token
== POINTER
)
1534 oberon_assert_token(ctx
, POINTER
);
1535 oberon_assert_token(ctx
, TO
);
1537 oberon_type_t
* base
;
1538 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1539 oberon_type(ctx
, &base
);
1541 oberon_type_t
* ptr
;
1543 ptr
-> class = OBERON_TYPE_POINTER
;
1546 else if(ctx
-> token
== PROCEDURE
)
1548 oberon_open_scope(ctx
);
1549 oberon_assert_token(ctx
, PROCEDURE
);
1550 oberon_opt_formal_pars(ctx
, type
);
1551 oberon_close_scope(ctx
-> decl
);
1555 oberon_error(ctx
, "invalid type declaration");
1560 oberon_type_decl(oberon_context_t
* ctx
)
1563 oberon_object_t
* newtype
;
1564 oberon_type_t
* type
;
1566 name
= oberon_assert_ident(ctx
);
1568 newtype
= oberon_find_object(ctx
-> decl
, name
, 0);
1571 newtype
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1572 newtype
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1573 assert(newtype
-> type
);
1577 if(newtype
-> class != OBERON_CLASS_TYPE
)
1579 oberon_error(ctx
, "mult definition");
1582 if(newtype
-> linked
)
1584 oberon_error(ctx
, "mult definition - already linked");
1588 oberon_assert_token(ctx
, EQUAL
);
1590 type
= newtype
-> type
;
1591 oberon_type(ctx
, &type
);
1593 if(type
-> class == OBERON_TYPE_VOID
)
1595 oberon_error(ctx
, "recursive alias declaration");
1598 newtype
-> type
= type
;
1599 newtype
-> linked
= 1;
1602 static void oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1603 static void oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1606 oberon_prevent_recursive_pointer(oberon_context_t
* ctx
, oberon_type_t
* type
)
1608 if(type
-> class != OBERON_TYPE_POINTER
1609 && type
-> class != OBERON_TYPE_ARRAY
)
1614 if(type
-> recursive
)
1616 oberon_error(ctx
, "recursive pointer declaration");
1619 if(type
-> base
-> class == OBERON_TYPE_POINTER
)
1621 oberon_error(ctx
, "attempt to make pointer to pointer");
1624 type
-> recursive
= 1;
1626 oberon_prevent_recursive_pointer(ctx
, type
-> base
);
1628 type
-> recursive
= 0;
1632 oberon_prevent_recursive_record(oberon_context_t
* ctx
, oberon_type_t
* type
)
1634 if(type
-> class != OBERON_TYPE_RECORD
)
1639 if(type
-> recursive
)
1641 oberon_error(ctx
, "recursive record declaration");
1644 type
-> recursive
= 1;
1646 int num_fields
= type
-> num_decl
;
1647 oberon_object_t
* field
= type
-> decl
;
1648 for(int i
= 0; i
< num_fields
; i
++)
1650 oberon_prevent_recursive_object(ctx
, field
);
1651 field
= field
-> next
;
1654 type
-> recursive
= 0;
1657 oberon_prevent_recursive_procedure(oberon_context_t
* ctx
, oberon_type_t
* type
)
1659 if(type
-> class != OBERON_TYPE_PROCEDURE
)
1664 if(type
-> recursive
)
1666 oberon_error(ctx
, "recursive procedure declaration");
1669 type
-> recursive
= 1;
1671 int num_fields
= type
-> num_decl
;
1672 oberon_object_t
* field
= type
-> decl
;
1673 for(int i
= 0; i
< num_fields
; i
++)
1675 oberon_prevent_recursive_object(ctx
, field
);
1676 field
= field
-> next
;
1679 type
-> recursive
= 0;
1683 oberon_prevent_recursive_array(oberon_context_t
* ctx
, oberon_type_t
* type
)
1685 if(type
-> class != OBERON_TYPE_ARRAY
)
1690 if(type
-> recursive
)
1692 oberon_error(ctx
, "recursive array declaration");
1695 type
-> recursive
= 1;
1697 oberon_prevent_recursive_type(ctx
, type
-> base
);
1699 type
-> recursive
= 0;
1703 oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1705 if(type
-> class == OBERON_TYPE_POINTER
)
1707 oberon_prevent_recursive_pointer(ctx
, type
);
1709 else if(type
-> class == OBERON_TYPE_RECORD
)
1711 oberon_prevent_recursive_record(ctx
, type
);
1713 else if(type
-> class == OBERON_TYPE_ARRAY
)
1715 oberon_prevent_recursive_array(ctx
, type
);
1717 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1719 oberon_prevent_recursive_procedure(ctx
, type
);
1724 oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
1728 case OBERON_CLASS_VAR
:
1729 case OBERON_CLASS_TYPE
:
1730 case OBERON_CLASS_PARAM
:
1731 case OBERON_CLASS_VAR_PARAM
:
1732 case OBERON_CLASS_FIELD
:
1733 oberon_prevent_recursive_type(ctx
, x
-> type
);
1735 case OBERON_CLASS_CONST
:
1736 case OBERON_CLASS_PROC
:
1739 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
1745 oberon_prevent_recursive_decl(oberon_context_t
* ctx
)
1747 oberon_object_t
* x
= ctx
-> decl
-> list
-> next
;
1751 oberon_prevent_recursive_object(ctx
, x
);
1756 static void oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1757 static void oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1760 oberon_initialize_record_fields(oberon_context_t
* ctx
, oberon_type_t
* type
)
1762 if(type
-> class != OBERON_TYPE_RECORD
)
1767 int num_fields
= type
-> num_decl
;
1768 oberon_object_t
* field
= type
-> decl
;
1769 for(int i
= 0; i
< num_fields
; i
++)
1771 if(field
-> type
-> class == OBERON_TYPE_POINTER
)
1773 oberon_initialize_type(ctx
, field
-> type
);
1776 oberon_initialize_object(ctx
, field
);
1777 field
= field
-> next
;
1780 oberon_generator_init_record(ctx
, type
);
1784 oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1786 if(type
-> class == OBERON_TYPE_VOID
)
1788 oberon_error(ctx
, "undeclarated type");
1791 if(type
-> initialized
)
1796 type
-> initialized
= 1;
1798 if(type
-> class == OBERON_TYPE_POINTER
)
1800 oberon_initialize_type(ctx
, type
-> base
);
1801 oberon_generator_init_type(ctx
, type
);
1803 else if(type
-> class == OBERON_TYPE_ARRAY
)
1805 oberon_initialize_type(ctx
, type
-> base
);
1806 oberon_generator_init_type(ctx
, type
);
1808 else if(type
-> class == OBERON_TYPE_RECORD
)
1810 oberon_generator_init_type(ctx
, type
);
1811 oberon_initialize_record_fields(ctx
, type
);
1813 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1815 int num_fields
= type
-> num_decl
;
1816 oberon_object_t
* field
= type
-> decl
;
1817 for(int i
= 0; i
< num_fields
; i
++)
1819 oberon_initialize_object(ctx
, field
);
1820 field
= field
-> next
;
1823 oberon_generator_init_type(ctx
, type
);
1827 oberon_generator_init_type(ctx
, type
);
1832 oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
1834 printf("oberon_initialize_object: name %s class %i\n", x
-> name
, x
-> class);
1837 case OBERON_CLASS_TYPE
:
1838 oberon_initialize_type(ctx
, x
-> type
);
1840 case OBERON_CLASS_VAR
:
1841 case OBERON_CLASS_PARAM
:
1842 case OBERON_CLASS_VAR_PARAM
:
1843 case OBERON_CLASS_FIELD
:
1844 oberon_initialize_type(ctx
, x
-> type
);
1845 oberon_generator_init_var(ctx
, x
);
1847 case OBERON_CLASS_CONST
:
1848 case OBERON_CLASS_PROC
:
1851 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
1857 oberon_initialize_decl(oberon_context_t
* ctx
)
1859 oberon_object_t
* x
= ctx
-> decl
-> list
;
1863 oberon_initialize_object(ctx
, x
-> next
);
1869 oberon_decl_seq(oberon_context_t
* ctx
)
1871 if(ctx
-> token
== CONST
)
1873 oberon_assert_token(ctx
, CONST
);
1874 while(ctx
-> token
== IDENT
)
1876 oberon_const_decl(ctx
);
1877 oberon_assert_token(ctx
, SEMICOLON
);
1881 if(ctx
-> token
== TYPE
)
1883 oberon_assert_token(ctx
, TYPE
);
1884 while(ctx
-> token
== IDENT
)
1886 oberon_type_decl(ctx
);
1887 oberon_assert_token(ctx
, SEMICOLON
);
1891 if(ctx
-> token
== VAR
)
1893 oberon_assert_token(ctx
, VAR
);
1894 while(ctx
-> token
== IDENT
)
1896 oberon_var_decl(ctx
);
1897 oberon_assert_token(ctx
, SEMICOLON
);
1901 oberon_prevent_recursive_decl(ctx
);
1902 oberon_initialize_decl(ctx
);
1904 while(ctx
-> token
== PROCEDURE
)
1906 oberon_proc_decl(ctx
);
1907 oberon_assert_token(ctx
, SEMICOLON
);
1912 oberon_assign(oberon_context_t
* ctx
, oberon_expr_t
* src
, oberon_expr_t
* dst
)
1914 oberon_autocast_to(ctx
, src
, dst
-> result
);
1915 oberon_generate_assign(ctx
, src
, dst
);
1919 oberon_make_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
1921 oberon_autocast_call(ctx
, desig
);
1922 oberon_generate_call_proc(ctx
, desig
);
1926 oberon_statement(oberon_context_t
* ctx
)
1928 oberon_expr_t
* item1
;
1929 oberon_expr_t
* item2
;
1931 if(ctx
-> token
== IDENT
)
1933 item1
= oberon_designator(ctx
);
1934 if(ctx
-> token
== ASSIGN
)
1936 oberon_assert_token(ctx
, ASSIGN
);
1937 item2
= oberon_expr(ctx
);
1938 oberon_assign(ctx
, item2
, item1
);
1942 item1
= oberon_opt_proc_parens(ctx
, item1
);
1943 oberon_make_call(ctx
, item1
);
1946 else if(ctx
-> token
== RETURN
)
1948 oberon_assert_token(ctx
, RETURN
);
1949 if(ISEXPR(ctx
-> token
))
1951 oberon_expr_t
* expr
;
1952 expr
= oberon_expr(ctx
);
1953 oberon_make_return(ctx
, expr
);
1957 oberon_make_return(ctx
, NULL
);
1963 oberon_statement_seq(oberon_context_t
* ctx
)
1965 oberon_statement(ctx
);
1966 while(ctx
-> token
== SEMICOLON
)
1968 oberon_assert_token(ctx
, SEMICOLON
);
1969 oberon_statement(ctx
);
1974 oberon_parse_module(oberon_context_t
* ctx
)
1976 char *name1
, *name2
;
1977 oberon_read_token(ctx
);
1979 oberon_assert_token(ctx
, MODULE
);
1980 name1
= oberon_assert_ident(ctx
);
1981 oberon_assert_token(ctx
, SEMICOLON
);
1982 ctx
-> mod
-> name
= name1
;
1984 oberon_decl_seq(ctx
);
1986 if(ctx
-> token
== BEGIN
)
1988 oberon_assert_token(ctx
, BEGIN
);
1989 oberon_generate_begin_module(ctx
);
1990 oberon_statement_seq(ctx
);
1991 oberon_generate_end_module(ctx
);
1994 oberon_assert_token(ctx
, END
);
1995 name2
= oberon_assert_ident(ctx
);
1996 oberon_assert_token(ctx
, DOT
);
1998 if(strcmp(name1
, name2
) != 0)
2000 oberon_error(ctx
, "module name not matched");
2004 // =======================================================================
2006 // =======================================================================
2009 register_default_types(oberon_context_t
* ctx
)
2011 ctx
-> void_type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2012 oberon_generator_init_type(ctx
, ctx
-> void_type
);
2014 ctx
-> void_ptr_type
= oberon_new_type_ptr(OBERON_TYPE_POINTER
);
2015 ctx
-> void_ptr_type
-> base
= ctx
-> void_type
;
2016 oberon_generator_init_type(ctx
, ctx
-> void_ptr_type
);
2018 ctx
-> int_type
= oberon_new_type_integer(sizeof(int));
2019 oberon_define_type(ctx
-> world_scope
, "INTEGER", ctx
-> int_type
);
2021 ctx
-> bool_type
= oberon_new_type_boolean(sizeof(int));
2022 oberon_define_type(ctx
-> world_scope
, "BOOLEAN", ctx
-> bool_type
);
2026 oberon_create_context()
2028 oberon_context_t
* ctx
= malloc(sizeof *ctx
);
2029 memset(ctx
, 0, sizeof *ctx
);
2031 oberon_scope_t
* world_scope
;
2032 world_scope
= oberon_open_scope(ctx
);
2033 ctx
-> world_scope
= world_scope
;
2035 oberon_generator_init_context(ctx
);
2037 register_default_types(ctx
);
2043 oberon_destroy_context(oberon_context_t
* ctx
)
2045 oberon_generator_destroy_context(ctx
);
2050 oberon_compile_module(oberon_context_t
* ctx
, const char * code
)
2052 oberon_module_t
* mod
= malloc(sizeof *mod
);
2053 memset(mod
, 0, sizeof *mod
);
2056 oberon_scope_t
* module_scope
;
2057 module_scope
= oberon_open_scope(ctx
);
2058 mod
-> decl
= module_scope
;
2060 oberon_init_scaner(ctx
, code
);
2061 oberon_parse_module(ctx
);
2063 oberon_generate_code(ctx
);