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
);
575 static oberon_item_t
* oberon_const_expr(oberon_context_t
* ctx
);
577 static oberon_expr_t
*
578 oberon_new_operator(int op
, oberon_type_t
* result
, oberon_expr_t
* left
, oberon_expr_t
* right
)
580 oberon_oper_t
* operator;
581 operator = malloc(sizeof *operator);
582 memset(operator, 0, sizeof *operator);
584 operator -> is_item
= 0;
585 operator -> result
= result
;
587 operator -> left
= left
;
588 operator -> right
= right
;
590 return (oberon_expr_t
*) operator;
593 static oberon_expr_t
*
594 oberon_new_item(int mode
, oberon_type_t
* result
)
596 oberon_item_t
* item
;
597 item
= malloc(sizeof *item
);
598 memset(item
, 0, sizeof *item
);
601 item
-> result
= result
;
604 return (oberon_expr_t
*)item
;
607 static oberon_expr_t
*
608 oberon_make_unary_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
)
610 oberon_expr_t
* expr
;
611 oberon_type_t
* result
;
613 result
= a
-> result
;
617 if(result
-> class != OBERON_TYPE_INTEGER
)
619 oberon_error(ctx
, "incompatible operator type");
622 expr
= oberon_new_operator(OP_UNARY_MINUS
, result
, a
, NULL
);
624 else if(token
== NOT
)
626 if(result
-> class != OBERON_TYPE_BOOLEAN
)
628 oberon_error(ctx
, "incompatible operator type");
631 expr
= oberon_new_operator(OP_LOGIC_NOT
, result
, a
, NULL
);
635 oberon_error(ctx
, "oberon_make_unary_op: wat");
642 oberon_expr_list(oberon_context_t
* ctx
, int * num_expr
, oberon_expr_t
** first
, int const_expr
)
644 oberon_expr_t
* last
;
647 *first
= last
= oberon_expr(ctx
);
648 while(ctx
-> token
== COMMA
)
650 oberon_assert_token(ctx
, COMMA
);
651 oberon_expr_t
* current
;
655 current
= (oberon_expr_t
*) oberon_const_expr(ctx
);
659 current
= oberon_expr(ctx
);
662 last
-> next
= current
;
668 static oberon_expr_t
*
669 oberon_autocast_to(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* pref
)
671 if(pref
-> class != expr
-> result
-> class)
673 oberon_error(ctx
, "incompatible types");
676 if(pref
-> class == OBERON_TYPE_INTEGER
)
678 if(expr
-> result
-> class > pref
-> class)
680 oberon_error(ctx
, "incompatible size");
683 else if(pref
-> class == OBERON_TYPE_RECORD
)
685 if(expr
-> result
!= pref
)
687 printf("oberon_autocast_to: rec %p != %p\n", expr
-> result
, pref
);
688 oberon_error(ctx
, "incompatible record types");
691 else if(pref
-> class == OBERON_TYPE_POINTER
)
693 if(expr
-> result
-> base
!= pref
-> base
)
695 if(expr
-> result
-> base
-> class != OBERON_TYPE_VOID
)
697 oberon_error(ctx
, "incompatible pointer types");
708 oberon_autocast_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
710 if(desig
-> is_item
== 0)
712 oberon_error(ctx
, "expected item");
715 if(desig
-> item
.mode
!= MODE_CALL
)
717 oberon_error(ctx
, "expected mode CALL");
720 if(desig
-> item
.var
-> class != OBERON_CLASS_PROC
)
722 oberon_error(ctx
, "only procedures can be called");
725 oberon_type_t
* fn
= desig
-> item
.var
-> type
;
726 int num_args
= desig
-> item
.num_args
;
727 int num_decl
= fn
-> num_decl
;
729 if(num_args
< num_decl
)
731 oberon_error(ctx
, "too few arguments");
733 else if(num_args
> num_decl
)
735 oberon_error(ctx
, "too many arguments");
738 oberon_expr_t
* arg
= desig
-> item
.args
;
739 oberon_object_t
* param
= fn
-> decl
;
740 for(int i
= 0; i
< num_args
; i
++)
742 if(param
-> class == OBERON_CLASS_VAR_PARAM
)
746 switch(arg
-> item
.mode
)
751 // Допустимо разыменование?
755 oberon_error(ctx
, "var-parameter accept only variables");
760 oberon_autocast_to(ctx
, arg
, param
-> type
);
762 param
= param
-> next
;
770 || ((x) == INTEGER) \
776 static oberon_expr_t
*
777 oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
779 if(expr
-> result
-> class != OBERON_TYPE_POINTER
)
781 oberon_error(ctx
, "not a pointer");
784 assert(expr
-> is_item
);
786 oberon_expr_t
* selector
;
787 selector
= oberon_new_item(MODE_DEREF
, expr
-> result
-> base
);
788 selector
-> item
.parent
= (oberon_item_t
*) expr
;
793 static oberon_expr_t
*
794 oberon_make_array_selector(oberon_context_t
* ctx
, oberon_expr_t
* desig
, oberon_expr_t
* index
)
796 if(desig
-> result
-> class == OBERON_TYPE_POINTER
)
798 desig
= oberno_make_dereferencing(ctx
, desig
);
801 assert(desig
-> is_item
);
803 if(desig
-> result
-> class != OBERON_TYPE_ARRAY
)
805 oberon_error(ctx
, "not array");
808 oberon_type_t
* base
;
809 base
= desig
-> result
-> base
;
811 if(index
-> result
-> class != OBERON_TYPE_INTEGER
)
813 oberon_error(ctx
, "index must be integer");
816 // Статическая проверка границ массива
819 if(index
-> item
.mode
== MODE_INTEGER
)
821 int arr_size
= desig
-> result
-> size
;
822 int index_int
= index
-> item
.integer
;
823 if(index_int
< 0 || index_int
> arr_size
- 1)
825 oberon_error(ctx
, "not in range (dimension size 0..%i)", arr_size
- 1);
830 oberon_expr_t
* selector
;
831 selector
= oberon_new_item(MODE_INDEX
, base
);
832 selector
-> item
.parent
= (oberon_item_t
*) desig
;
833 selector
-> item
.num_args
= 1;
834 selector
-> item
.args
= index
;
839 static oberon_expr_t
*
840 oberon_make_record_selector(oberon_context_t
* ctx
, oberon_expr_t
* expr
, char * name
)
842 if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
844 expr
= oberno_make_dereferencing(ctx
, expr
);
847 assert(expr
-> is_item
== 1);
849 if(expr
-> result
-> class != OBERON_TYPE_RECORD
)
851 oberon_error(ctx
, "not record");
854 oberon_type_t
* rec
= expr
-> result
;
856 oberon_object_t
* field
;
857 field
= oberon_find_field(ctx
, rec
, name
);
859 oberon_expr_t
* selector
;
860 selector
= oberon_new_item(MODE_FIELD
, field
-> type
);
861 selector
-> item
.var
= field
;
862 selector
-> item
.parent
= (oberon_item_t
*) expr
;
867 #define ISSELECTOR(x) \
872 static oberon_expr_t
*
873 oberon_designator(oberon_context_t
* ctx
)
876 oberon_object_t
* var
;
877 oberon_expr_t
* expr
;
879 name
= oberon_assert_ident(ctx
);
880 var
= oberon_find_object(ctx
-> decl
, name
, 1);
884 case OBERON_CLASS_CONST
:
886 expr
= (oberon_expr_t
*) var
-> value
;
888 case OBERON_CLASS_VAR
:
889 case OBERON_CLASS_VAR_PARAM
:
890 case OBERON_CLASS_PARAM
:
891 expr
= oberon_new_item(MODE_VAR
, var
-> type
);
893 case OBERON_CLASS_PROC
:
894 expr
= oberon_new_item(MODE_CALL
, var
-> type
);
897 oberon_error(ctx
, "invalid designator");
900 expr
-> item
.var
= var
;
902 while(ISSELECTOR(ctx
-> token
))
907 oberon_assert_token(ctx
, DOT
);
908 name
= oberon_assert_ident(ctx
);
909 expr
= oberon_make_record_selector(ctx
, expr
, name
);
912 oberon_assert_token(ctx
, LBRACE
);
914 oberon_expr_t
* indexes
= NULL
;
915 oberon_expr_list(ctx
, &num_indexes
, &indexes
, 0);
916 oberon_assert_token(ctx
, RBRACE
);
918 for(int i
= 0; i
< num_indexes
; i
++)
920 expr
= oberon_make_array_selector(ctx
, expr
, indexes
);
921 indexes
= indexes
-> next
;
925 oberon_assert_token(ctx
, UPARROW
);
926 expr
= oberno_make_dereferencing(ctx
, expr
);
929 oberon_error(ctx
, "oberon_designator: wat");
936 static oberon_expr_t
*
937 oberon_opt_proc_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
939 assert(expr
-> is_item
== 1);
941 if(ctx
-> token
== LPAREN
)
943 if(expr
-> result
-> class != OBERON_TYPE_PROCEDURE
)
945 oberon_error(ctx
, "not a procedure");
948 oberon_assert_token(ctx
, LPAREN
);
951 oberon_expr_t
* arguments
= NULL
;
953 if(ISEXPR(ctx
-> token
))
955 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
958 expr
-> result
= expr
-> item
.var
-> type
-> base
;
959 expr
-> item
.mode
= MODE_CALL
;
960 expr
-> item
.num_args
= num_args
;
961 expr
-> item
.args
= arguments
;
962 oberon_assert_token(ctx
, RPAREN
);
964 oberon_autocast_call(ctx
, expr
);
970 static oberon_expr_t
*
971 oberon_factor(oberon_context_t
* ctx
)
973 oberon_expr_t
* expr
;
978 expr
= oberon_designator(ctx
);
979 expr
= oberon_opt_proc_parens(ctx
, expr
);
982 expr
= oberon_new_item(MODE_INTEGER
, ctx
-> int_type
);
983 expr
-> item
.integer
= ctx
-> integer
;
984 oberon_assert_token(ctx
, INTEGER
);
987 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
988 expr
-> item
.boolean
= 1;
989 oberon_assert_token(ctx
, TRUE
);
992 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
);
993 expr
-> item
.boolean
= 0;
994 oberon_assert_token(ctx
, FALSE
);
997 oberon_assert_token(ctx
, LPAREN
);
998 expr
= oberon_expr(ctx
);
999 oberon_assert_token(ctx
, RPAREN
);
1002 oberon_assert_token(ctx
, NOT
);
1003 expr
= oberon_factor(ctx
);
1004 expr
= oberon_make_unary_op(ctx
, NOT
, expr
);
1007 oberon_assert_token(ctx
, NIL
);
1008 expr
= oberon_new_item(MODE_NIL
, ctx
-> void_ptr_type
);
1011 oberon_error(ctx
, "invalid expression");
1018 * oberon_autocast_binary_op автоматически переобразовывеат тип по след. правилам:
1019 * 1. Классы обоих типов должны быть одинаковы
1020 * 2. В качестве результата должен быть выбран больший тип.
1021 * 3. Если размер результат не должен быть меньше чем базовый int
1025 oberon_autocast_binary_op(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
, oberon_type_t
** result
)
1027 if((a
-> class) != (b
-> class))
1029 oberon_error(ctx
, "incompatible types");
1032 if((a
-> size
) > (b
-> size
))
1041 if(((*result
) -> class) == OBERON_TYPE_INTEGER
)
1043 if(((*result
) -> size
) < (ctx
-> int_type
-> size
))
1045 *result
= ctx
-> int_type
;
1049 /* TODO: cast types */
1052 #define ITMAKESBOOLEAN(x) \
1053 (((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
1055 #define ITUSEONLYINTEGER(x) \
1056 ((x) >= LESS && (x) <= GEQ)
1058 #define ITUSEONLYBOOLEAN(x) \
1059 (((x) == OR) || ((x) == AND))
1061 static oberon_expr_t
*
1062 oberon_make_bin_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
, oberon_expr_t
* b
)
1064 oberon_expr_t
* expr
;
1065 oberon_type_t
* result
;
1067 if(ITMAKESBOOLEAN(token
))
1069 if(ITUSEONLYINTEGER(token
))
1071 if(a
-> result
-> class != OBERON_TYPE_INTEGER
1072 || b
-> result
-> class != OBERON_TYPE_INTEGER
)
1074 oberon_error(ctx
, "used only with integer types");
1077 else if(ITUSEONLYBOOLEAN(token
))
1079 if(a
-> result
-> class != OBERON_TYPE_BOOLEAN
1080 || b
-> result
-> class != OBERON_TYPE_BOOLEAN
)
1082 oberon_error(ctx
, "used only with boolean type");
1086 result
= ctx
-> bool_type
;
1090 expr
= oberon_new_operator(OP_EQ
, result
, a
, b
);
1092 else if(token
== NEQ
)
1094 expr
= oberon_new_operator(OP_NEQ
, result
, a
, b
);
1096 else if(token
== LESS
)
1098 expr
= oberon_new_operator(OP_LSS
, result
, a
, b
);
1100 else if(token
== LEQ
)
1102 expr
= oberon_new_operator(OP_LEQ
, result
, a
, b
);
1104 else if(token
== GREAT
)
1106 expr
= oberon_new_operator(OP_GRT
, result
, a
, b
);
1108 else if(token
== GEQ
)
1110 expr
= oberon_new_operator(OP_GEQ
, result
, a
, b
);
1112 else if(token
== OR
)
1114 expr
= oberon_new_operator(OP_LOGIC_OR
, result
, a
, b
);
1116 else if(token
== AND
)
1118 expr
= oberon_new_operator(OP_LOGIC_AND
, result
, a
, b
);
1122 oberon_error(ctx
, "oberon_make_bin_op: bool wat");
1127 oberon_autocast_binary_op(ctx
, a
-> result
, b
-> result
, &result
);
1131 expr
= oberon_new_operator(OP_ADD
, result
, a
, b
);
1133 else if(token
== MINUS
)
1135 expr
= oberon_new_operator(OP_SUB
, result
, a
, b
);
1137 else if(token
== STAR
)
1139 expr
= oberon_new_operator(OP_MUL
, result
, a
, b
);
1141 else if(token
== SLASH
)
1143 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1145 else if(token
== DIV
)
1147 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1149 else if(token
== MOD
)
1151 expr
= oberon_new_operator(OP_MOD
, result
, a
, b
);
1155 oberon_error(ctx
, "oberon_make_bin_op: bin wat");
1162 #define ISMULOP(x) \
1163 ((x) >= STAR && (x) <= AND)
1165 static oberon_expr_t
*
1166 oberon_term_expr(oberon_context_t
* ctx
)
1168 oberon_expr_t
* expr
;
1170 expr
= oberon_factor(ctx
);
1171 while(ISMULOP(ctx
-> token
))
1173 int token
= ctx
-> token
;
1174 oberon_read_token(ctx
);
1176 oberon_expr_t
* inter
= oberon_factor(ctx
);
1177 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1183 #define ISADDOP(x) \
1184 ((x) >= PLUS && (x) <= OR)
1186 static oberon_expr_t
*
1187 oberon_simple_expr(oberon_context_t
* ctx
)
1189 oberon_expr_t
* expr
;
1192 if(ctx
-> token
== PLUS
)
1195 oberon_assert_token(ctx
, PLUS
);
1197 else if(ctx
-> token
== MINUS
)
1200 oberon_assert_token(ctx
, MINUS
);
1203 expr
= oberon_term_expr(ctx
);
1204 while(ISADDOP(ctx
-> token
))
1206 int token
= ctx
-> token
;
1207 oberon_read_token(ctx
);
1209 oberon_expr_t
* inter
= oberon_term_expr(ctx
);
1210 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1215 expr
= oberon_make_unary_op(ctx
, MINUS
, expr
);
1221 #define ISRELATION(x) \
1222 ((x) >= EQUAL && (x) <= GEQ)
1224 static oberon_expr_t
*
1225 oberon_expr(oberon_context_t
* ctx
)
1227 oberon_expr_t
* expr
;
1229 expr
= oberon_simple_expr(ctx
);
1230 while(ISRELATION(ctx
-> token
))
1232 int token
= ctx
-> token
;
1233 oberon_read_token(ctx
);
1235 oberon_expr_t
* inter
= oberon_simple_expr(ctx
);
1236 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
1242 static oberon_item_t
*
1243 oberon_const_expr(oberon_context_t
* ctx
)
1245 oberon_expr_t
* expr
;
1246 expr
= oberon_expr(ctx
);
1248 if(expr
-> is_item
== 0)
1250 oberon_error(ctx
, "const expression are required");
1253 return (oberon_item_t
*) expr
;
1256 // =======================================================================
1258 // =======================================================================
1260 static void oberon_decl_seq(oberon_context_t
* ctx
);
1261 static void oberon_statement_seq(oberon_context_t
* ctx
);
1264 oberon_expect_token(oberon_context_t
* ctx
, int token
)
1266 if(ctx
-> token
!= token
)
1268 oberon_error(ctx
, "unexpected token %i (%i)", ctx
-> token
, token
);
1273 oberon_assert_token(oberon_context_t
* ctx
, int token
)
1275 oberon_expect_token(ctx
, token
);
1276 oberon_read_token(ctx
);
1280 oberon_assert_ident(oberon_context_t
* ctx
)
1282 oberon_expect_token(ctx
, IDENT
);
1283 char * ident
= ctx
-> string
;
1284 oberon_read_token(ctx
);
1289 oberon_var_decl(oberon_context_t
* ctx
)
1292 oberon_type_t
* type
;
1293 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1295 name
= oberon_assert_ident(ctx
);
1296 oberon_assert_token(ctx
, COLON
);
1297 oberon_type(ctx
, &type
);
1298 oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR
, name
, type
);
1301 static oberon_object_t
*
1302 oberon_make_param(oberon_context_t
* ctx
, int token
, char * name
, oberon_type_t
* type
)
1304 oberon_object_t
* param
;
1308 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_VAR_PARAM
, name
, type
);
1310 else if(token
== IDENT
)
1312 param
= oberon_define_var(ctx
-> decl
, OBERON_CLASS_PARAM
, name
, type
);
1316 oberon_error(ctx
, "oberon_make_param: wat");
1322 static oberon_object_t
*
1323 oberon_fp_section(oberon_context_t
* ctx
, int * num_decl
)
1325 int modifer_token
= ctx
-> token
;
1326 if(ctx
-> token
== VAR
)
1328 oberon_read_token(ctx
);
1332 name
= oberon_assert_ident(ctx
);
1334 oberon_assert_token(ctx
, COLON
);
1336 oberon_type_t
* type
;
1337 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1338 oberon_type(ctx
, &type
);
1340 oberon_object_t
* first
;
1341 first
= oberon_make_param(ctx
, modifer_token
, name
, type
);
1347 #define ISFPSECTION \
1348 ((ctx -> token == VAR) || (ctx -> token == IDENT))
1351 oberon_formal_pars(oberon_context_t
* ctx
, oberon_type_t
* signature
)
1353 oberon_assert_token(ctx
, LPAREN
);
1357 signature
-> decl
= oberon_fp_section(ctx
, &signature
-> num_decl
);
1358 while(ctx
-> token
== SEMICOLON
)
1360 oberon_assert_token(ctx
, SEMICOLON
);
1361 oberon_fp_section(ctx
, &signature
-> num_decl
);
1365 oberon_assert_token(ctx
, RPAREN
);
1367 if(ctx
-> token
== COLON
)
1369 oberon_assert_token(ctx
, COLON
);
1370 // TODO get by qualident
1371 oberon_type(ctx
, &signature
-> base
);
1376 oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
)
1378 oberon_type_t
* signature
;
1380 signature
-> class = OBERON_TYPE_PROCEDURE
;
1381 signature
-> num_decl
= 0;
1382 signature
-> base
= ctx
-> void_type
;
1383 signature
-> decl
= NULL
;
1385 if(ctx
-> token
== LPAREN
)
1387 oberon_formal_pars(ctx
, signature
);
1392 oberon_make_return(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1394 if(ctx
-> result_type
-> class == OBERON_TYPE_VOID
)
1398 oberon_error(ctx
, "procedure has no result type");
1405 oberon_error(ctx
, "procedure requires expression on result");
1408 oberon_autocast_to(ctx
, expr
, ctx
-> result_type
);
1411 ctx
-> has_return
= 1;
1413 oberon_generate_return(ctx
, expr
);
1417 oberon_proc_decl(oberon_context_t
* ctx
)
1419 oberon_assert_token(ctx
, PROCEDURE
);
1422 name
= oberon_assert_ident(ctx
);
1424 oberon_scope_t
* this_proc_def_scope
= ctx
-> decl
;
1425 oberon_open_scope(ctx
);
1427 oberon_type_t
* signature
;
1428 signature
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1429 oberon_opt_formal_pars(ctx
, &signature
);
1431 oberon_object_t
* proc
;
1432 proc
= oberon_define_proc(this_proc_def_scope
, name
, signature
);
1434 ctx
-> result_type
= signature
-> base
;
1435 ctx
-> has_return
= 0;
1437 oberon_assert_token(ctx
, SEMICOLON
);
1439 oberon_decl_seq(ctx
);
1440 oberon_generator_init_type(ctx
, signature
);
1441 oberon_generator_init_proc(ctx
, proc
);
1443 oberon_generate_begin_proc(ctx
, proc
);
1445 if(ctx
-> token
== BEGIN
)
1447 oberon_assert_token(ctx
, BEGIN
);
1448 oberon_statement_seq(ctx
);
1451 oberon_assert_token(ctx
, END
);
1452 char * name2
= oberon_assert_ident(ctx
);
1453 if(strcmp(name2
, name
) != 0)
1455 oberon_error(ctx
, "procedure name not matched");
1458 if(signature
-> base
-> class == OBERON_TYPE_VOID
)
1460 oberon_make_return(ctx
, NULL
);
1463 if(ctx
-> has_return
== 0)
1465 oberon_error(ctx
, "procedure requires return");
1467 ctx
-> result_type
= NULL
;
1469 oberon_generate_end_proc(ctx
);
1470 oberon_close_scope(ctx
-> decl
);
1474 oberon_const_decl(oberon_context_t
* ctx
)
1477 oberon_item_t
* value
;
1478 oberon_object_t
* constant
;
1480 name
= oberon_assert_ident(ctx
);
1481 oberon_assert_token(ctx
, EQUAL
);
1482 value
= oberon_const_expr(ctx
);
1484 constant
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_CONST
);
1485 constant
-> value
= value
;
1489 oberon_make_array_type(oberon_context_t
* ctx
, oberon_expr_t
* size
, oberon_type_t
* base
, oberon_type_t
** type
)
1491 if(size
-> is_item
== 0)
1493 oberon_error(ctx
, "requires constant");
1496 if(size
-> item
.mode
!= MODE_INTEGER
)
1498 oberon_error(ctx
, "requires integer constant");
1501 oberon_type_t
* arr
;
1503 arr
-> class = OBERON_TYPE_ARRAY
;
1504 arr
-> size
= size
-> item
.integer
;
1509 oberon_field_list(oberon_context_t
* ctx
, oberon_type_t
* rec
)
1511 if(ctx
-> token
== IDENT
)
1514 oberon_type_t
* type
;
1515 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1517 name
= oberon_assert_ident(ctx
);
1518 oberon_assert_token(ctx
, COLON
);
1519 oberon_type(ctx
, &type
);
1520 oberon_define_field(ctx
, rec
, name
, type
);
1525 oberon_qualident_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1528 oberon_object_t
* to
;
1530 name
= oberon_assert_ident(ctx
);
1531 to
= oberon_find_object(ctx
-> decl
, name
, 0);
1535 if(to
-> class != OBERON_CLASS_TYPE
)
1537 oberon_error(ctx
, "not a type");
1542 to
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1543 to
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1549 static void oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
);
1552 * Правило граматики "type". Указатель type должен указывать на существующий объект!
1556 oberon_make_multiarray(oberon_context_t
* ctx
, oberon_expr_t
* sizes
, oberon_type_t
* base
, oberon_type_t
** type
)
1564 oberon_type_t
* dim
;
1565 dim
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1567 oberon_make_multiarray(ctx
, sizes
-> next
, base
, &dim
);
1569 oberon_make_array_type(ctx
, sizes
, dim
, type
);
1573 oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
1575 if(ctx
-> token
== IDENT
)
1577 oberon_qualident_type(ctx
, type
);
1579 else if(ctx
-> token
== ARRAY
)
1581 oberon_assert_token(ctx
, ARRAY
);
1584 oberon_expr_t
* sizes
;
1585 oberon_expr_list(ctx
, &num_sizes
, &sizes
, 1);
1587 oberon_assert_token(ctx
, OF
);
1589 oberon_type_t
* base
;
1590 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1591 oberon_type(ctx
, &base
);
1593 oberon_make_multiarray(ctx
, sizes
, base
, type
);
1595 else if(ctx
-> token
== RECORD
)
1597 oberon_type_t
* rec
;
1599 rec
-> class = OBERON_TYPE_RECORD
;
1600 oberon_object_t
* list
= malloc(sizeof *list
);
1601 memset(list
, 0, sizeof *list
);
1602 rec
-> num_decl
= 0;
1606 oberon_assert_token(ctx
, RECORD
);
1607 oberon_field_list(ctx
, rec
);
1608 while(ctx
-> token
== SEMICOLON
)
1610 oberon_assert_token(ctx
, SEMICOLON
);
1611 oberon_field_list(ctx
, rec
);
1613 oberon_assert_token(ctx
, END
);
1615 rec
-> decl
= rec
-> decl
-> next
;
1618 else if(ctx
-> token
== POINTER
)
1620 oberon_assert_token(ctx
, POINTER
);
1621 oberon_assert_token(ctx
, TO
);
1623 oberon_type_t
* base
;
1624 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1625 oberon_type(ctx
, &base
);
1627 oberon_type_t
* ptr
;
1629 ptr
-> class = OBERON_TYPE_POINTER
;
1632 else if(ctx
-> token
== PROCEDURE
)
1634 oberon_open_scope(ctx
);
1635 oberon_assert_token(ctx
, PROCEDURE
);
1636 oberon_opt_formal_pars(ctx
, type
);
1637 oberon_close_scope(ctx
-> decl
);
1641 oberon_error(ctx
, "invalid type declaration");
1646 oberon_type_decl(oberon_context_t
* ctx
)
1649 oberon_object_t
* newtype
;
1650 oberon_type_t
* type
;
1652 name
= oberon_assert_ident(ctx
);
1654 newtype
= oberon_find_object(ctx
-> decl
, name
, 0);
1657 newtype
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
);
1658 newtype
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
1659 assert(newtype
-> type
);
1663 if(newtype
-> class != OBERON_CLASS_TYPE
)
1665 oberon_error(ctx
, "mult definition");
1668 if(newtype
-> linked
)
1670 oberon_error(ctx
, "mult definition - already linked");
1674 oberon_assert_token(ctx
, EQUAL
);
1676 type
= newtype
-> type
;
1677 oberon_type(ctx
, &type
);
1679 if(type
-> class == OBERON_TYPE_VOID
)
1681 oberon_error(ctx
, "recursive alias declaration");
1684 newtype
-> type
= type
;
1685 newtype
-> linked
= 1;
1688 static void oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1689 static void oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1692 oberon_prevent_recursive_pointer(oberon_context_t
* ctx
, oberon_type_t
* type
)
1694 if(type
-> class != OBERON_TYPE_POINTER
1695 && type
-> class != OBERON_TYPE_ARRAY
)
1700 if(type
-> recursive
)
1702 oberon_error(ctx
, "recursive pointer declaration");
1705 if(type
-> base
-> class == OBERON_TYPE_POINTER
)
1707 oberon_error(ctx
, "attempt to make pointer to pointer");
1710 type
-> recursive
= 1;
1712 oberon_prevent_recursive_pointer(ctx
, type
-> base
);
1714 type
-> recursive
= 0;
1718 oberon_prevent_recursive_record(oberon_context_t
* ctx
, oberon_type_t
* type
)
1720 if(type
-> class != OBERON_TYPE_RECORD
)
1725 if(type
-> recursive
)
1727 oberon_error(ctx
, "recursive record declaration");
1730 type
-> recursive
= 1;
1732 int num_fields
= type
-> num_decl
;
1733 oberon_object_t
* field
= type
-> decl
;
1734 for(int i
= 0; i
< num_fields
; i
++)
1736 oberon_prevent_recursive_object(ctx
, field
);
1737 field
= field
-> next
;
1740 type
-> recursive
= 0;
1743 oberon_prevent_recursive_procedure(oberon_context_t
* ctx
, oberon_type_t
* type
)
1745 if(type
-> class != OBERON_TYPE_PROCEDURE
)
1750 if(type
-> recursive
)
1752 oberon_error(ctx
, "recursive procedure declaration");
1755 type
-> recursive
= 1;
1757 int num_fields
= type
-> num_decl
;
1758 oberon_object_t
* field
= type
-> decl
;
1759 for(int i
= 0; i
< num_fields
; i
++)
1761 oberon_prevent_recursive_object(ctx
, field
);
1762 field
= field
-> next
;
1765 type
-> recursive
= 0;
1769 oberon_prevent_recursive_array(oberon_context_t
* ctx
, oberon_type_t
* type
)
1771 if(type
-> class != OBERON_TYPE_ARRAY
)
1776 if(type
-> recursive
)
1778 oberon_error(ctx
, "recursive array declaration");
1781 type
-> recursive
= 1;
1783 oberon_prevent_recursive_type(ctx
, type
-> base
);
1785 type
-> recursive
= 0;
1789 oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1791 if(type
-> class == OBERON_TYPE_POINTER
)
1793 oberon_prevent_recursive_pointer(ctx
, type
);
1795 else if(type
-> class == OBERON_TYPE_RECORD
)
1797 oberon_prevent_recursive_record(ctx
, type
);
1799 else if(type
-> class == OBERON_TYPE_ARRAY
)
1801 oberon_prevent_recursive_array(ctx
, type
);
1803 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1805 oberon_prevent_recursive_procedure(ctx
, type
);
1810 oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
1814 case OBERON_CLASS_VAR
:
1815 case OBERON_CLASS_TYPE
:
1816 case OBERON_CLASS_PARAM
:
1817 case OBERON_CLASS_VAR_PARAM
:
1818 case OBERON_CLASS_FIELD
:
1819 oberon_prevent_recursive_type(ctx
, x
-> type
);
1821 case OBERON_CLASS_CONST
:
1822 case OBERON_CLASS_PROC
:
1825 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
1831 oberon_prevent_recursive_decl(oberon_context_t
* ctx
)
1833 oberon_object_t
* x
= ctx
-> decl
-> list
-> next
;
1837 oberon_prevent_recursive_object(ctx
, x
);
1842 static void oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
1843 static void oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
1846 oberon_initialize_record_fields(oberon_context_t
* ctx
, oberon_type_t
* type
)
1848 if(type
-> class != OBERON_TYPE_RECORD
)
1853 int num_fields
= type
-> num_decl
;
1854 oberon_object_t
* field
= type
-> decl
;
1855 for(int i
= 0; i
< num_fields
; i
++)
1857 if(field
-> type
-> class == OBERON_TYPE_POINTER
)
1859 oberon_initialize_type(ctx
, field
-> type
);
1862 oberon_initialize_object(ctx
, field
);
1863 field
= field
-> next
;
1866 oberon_generator_init_record(ctx
, type
);
1870 oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
1872 if(type
-> class == OBERON_TYPE_VOID
)
1874 oberon_error(ctx
, "undeclarated type");
1877 if(type
-> initialized
)
1882 type
-> initialized
= 1;
1884 if(type
-> class == OBERON_TYPE_POINTER
)
1886 oberon_initialize_type(ctx
, type
-> base
);
1887 oberon_generator_init_type(ctx
, type
);
1889 else if(type
-> class == OBERON_TYPE_ARRAY
)
1891 oberon_initialize_type(ctx
, type
-> base
);
1892 oberon_generator_init_type(ctx
, type
);
1894 else if(type
-> class == OBERON_TYPE_RECORD
)
1896 oberon_generator_init_type(ctx
, type
);
1897 oberon_initialize_record_fields(ctx
, type
);
1899 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
1901 int num_fields
= type
-> num_decl
;
1902 oberon_object_t
* field
= type
-> decl
;
1903 for(int i
= 0; i
< num_fields
; i
++)
1905 oberon_initialize_object(ctx
, field
);
1906 field
= field
-> next
;
1909 oberon_generator_init_type(ctx
, type
);
1913 oberon_generator_init_type(ctx
, type
);
1918 oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
1920 printf("oberon_initialize_object: name %s class %i\n", x
-> name
, x
-> class);
1923 case OBERON_CLASS_TYPE
:
1924 oberon_initialize_type(ctx
, x
-> type
);
1926 case OBERON_CLASS_VAR
:
1927 case OBERON_CLASS_PARAM
:
1928 case OBERON_CLASS_VAR_PARAM
:
1929 case OBERON_CLASS_FIELD
:
1930 oberon_initialize_type(ctx
, x
-> type
);
1931 oberon_generator_init_var(ctx
, x
);
1933 case OBERON_CLASS_CONST
:
1934 case OBERON_CLASS_PROC
:
1937 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
1943 oberon_initialize_decl(oberon_context_t
* ctx
)
1945 oberon_object_t
* x
= ctx
-> decl
-> list
;
1949 oberon_initialize_object(ctx
, x
-> next
);
1955 oberon_decl_seq(oberon_context_t
* ctx
)
1957 if(ctx
-> token
== CONST
)
1959 oberon_assert_token(ctx
, CONST
);
1960 while(ctx
-> token
== IDENT
)
1962 oberon_const_decl(ctx
);
1963 oberon_assert_token(ctx
, SEMICOLON
);
1967 if(ctx
-> token
== TYPE
)
1969 oberon_assert_token(ctx
, TYPE
);
1970 while(ctx
-> token
== IDENT
)
1972 oberon_type_decl(ctx
);
1973 oberon_assert_token(ctx
, SEMICOLON
);
1977 if(ctx
-> token
== VAR
)
1979 oberon_assert_token(ctx
, VAR
);
1980 while(ctx
-> token
== IDENT
)
1982 oberon_var_decl(ctx
);
1983 oberon_assert_token(ctx
, SEMICOLON
);
1987 oberon_prevent_recursive_decl(ctx
);
1988 oberon_initialize_decl(ctx
);
1990 while(ctx
-> token
== PROCEDURE
)
1992 oberon_proc_decl(ctx
);
1993 oberon_assert_token(ctx
, SEMICOLON
);
1998 oberon_assign(oberon_context_t
* ctx
, oberon_expr_t
* src
, oberon_expr_t
* dst
)
2000 oberon_autocast_to(ctx
, src
, dst
-> result
);
2001 oberon_generate_assign(ctx
, src
, dst
);
2005 oberon_make_call(oberon_context_t
* ctx
, oberon_expr_t
* desig
)
2007 if(desig
-> result
-> class != OBERON_TYPE_VOID
)
2009 oberon_error(ctx
, "procedure with result");
2012 oberon_autocast_call(ctx
, desig
);
2013 oberon_generate_call_proc(ctx
, desig
);
2017 oberon_statement(oberon_context_t
* ctx
)
2019 oberon_expr_t
* item1
;
2020 oberon_expr_t
* item2
;
2022 if(ctx
-> token
== IDENT
)
2024 item1
= oberon_designator(ctx
);
2025 if(ctx
-> token
== ASSIGN
)
2027 oberon_assert_token(ctx
, ASSIGN
);
2028 item2
= oberon_expr(ctx
);
2029 oberon_assign(ctx
, item2
, item1
);
2033 item1
= oberon_opt_proc_parens(ctx
, item1
);
2034 oberon_make_call(ctx
, item1
);
2037 else if(ctx
-> token
== RETURN
)
2039 oberon_assert_token(ctx
, RETURN
);
2040 if(ISEXPR(ctx
-> token
))
2042 oberon_expr_t
* expr
;
2043 expr
= oberon_expr(ctx
);
2044 oberon_make_return(ctx
, expr
);
2048 oberon_make_return(ctx
, NULL
);
2054 oberon_statement_seq(oberon_context_t
* ctx
)
2056 oberon_statement(ctx
);
2057 while(ctx
-> token
== SEMICOLON
)
2059 oberon_assert_token(ctx
, SEMICOLON
);
2060 oberon_statement(ctx
);
2065 oberon_parse_module(oberon_context_t
* ctx
)
2067 char *name1
, *name2
;
2068 oberon_read_token(ctx
);
2070 oberon_assert_token(ctx
, MODULE
);
2071 name1
= oberon_assert_ident(ctx
);
2072 oberon_assert_token(ctx
, SEMICOLON
);
2073 ctx
-> mod
-> name
= name1
;
2075 oberon_decl_seq(ctx
);
2077 if(ctx
-> token
== BEGIN
)
2079 oberon_assert_token(ctx
, BEGIN
);
2080 oberon_generate_begin_module(ctx
);
2081 oberon_statement_seq(ctx
);
2082 oberon_generate_end_module(ctx
);
2085 oberon_assert_token(ctx
, END
);
2086 name2
= oberon_assert_ident(ctx
);
2087 oberon_assert_token(ctx
, DOT
);
2089 if(strcmp(name1
, name2
) != 0)
2091 oberon_error(ctx
, "module name not matched");
2095 // =======================================================================
2097 // =======================================================================
2100 register_default_types(oberon_context_t
* ctx
)
2102 ctx
-> void_type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2103 oberon_generator_init_type(ctx
, ctx
-> void_type
);
2105 ctx
-> void_ptr_type
= oberon_new_type_ptr(OBERON_TYPE_POINTER
);
2106 ctx
-> void_ptr_type
-> base
= ctx
-> void_type
;
2107 oberon_generator_init_type(ctx
, ctx
-> void_ptr_type
);
2109 ctx
-> int_type
= oberon_new_type_integer(sizeof(int));
2110 oberon_define_type(ctx
-> world_scope
, "INTEGER", ctx
-> int_type
);
2112 ctx
-> bool_type
= oberon_new_type_boolean(sizeof(int));
2113 oberon_define_type(ctx
-> world_scope
, "BOOLEAN", ctx
-> bool_type
);
2117 oberon_create_context()
2119 oberon_context_t
* ctx
= malloc(sizeof *ctx
);
2120 memset(ctx
, 0, sizeof *ctx
);
2122 oberon_scope_t
* world_scope
;
2123 world_scope
= oberon_open_scope(ctx
);
2124 ctx
-> world_scope
= world_scope
;
2126 oberon_generator_init_context(ctx
);
2128 register_default_types(ctx
);
2134 oberon_destroy_context(oberon_context_t
* ctx
)
2136 oberon_generator_destroy_context(ctx
);
2141 oberon_compile_module(oberon_context_t
* ctx
, const char * code
)
2143 oberon_module_t
* mod
= malloc(sizeof *mod
);
2144 memset(mod
, 0, sizeof *mod
);
2147 oberon_scope_t
* module_scope
;
2148 module_scope
= oberon_open_scope(ctx
);
2149 mod
-> decl
= module_scope
;
2151 oberon_init_scaner(ctx
, code
);
2152 oberon_parse_module(ctx
);
2154 oberon_generate_code(ctx
);