10 #include "../include/oberon.h"
12 #include "oberon-internals.h"
13 #include "generator.h"
84 // =======================================================================
86 // =======================================================================
89 oberon_error(oberon_context_t
* ctx
, const char * fmt
, ...)
93 fprintf(stderr
, "error: ");
94 vfprintf(stderr
, fmt
, ptr
);
95 fprintf(stderr
, "\n");
96 fprintf(stderr
, " code_index = %i\n", ctx
-> code_index
);
97 fprintf(stderr
, " c = %c\n", ctx
-> c
);
98 fprintf(stderr
, " token = %i\n", ctx
-> token
);
103 static oberon_type_t
*
104 oberon_new_type_ptr(int class)
106 oberon_type_t
* x
= malloc(sizeof *x
);
107 memset(x
, 0, sizeof *x
);
112 static oberon_type_t
*
113 oberon_new_type_integer(int size
)
116 x
= oberon_new_type_ptr(OBERON_TYPE_INTEGER
);
121 static oberon_type_t
*
122 oberon_new_type_boolean()
125 x
= oberon_new_type_ptr(OBERON_TYPE_BOOLEAN
);
129 static oberon_type_t
*
130 oberon_new_type_real(int size
)
133 x
= oberon_new_type_ptr(OBERON_TYPE_REAL
);
138 static oberon_type_t
*
139 oberon_new_type_char(int size
)
142 x
= oberon_new_type_ptr(OBERON_TYPE_CHAR
);
147 static oberon_type_t
*
148 oberon_new_type_string(int size
)
151 x
= oberon_new_type_ptr(OBERON_TYPE_STRING
);
156 static oberon_type_t
*
157 oberon_new_type_set(int size
)
160 x
= oberon_new_type_ptr(OBERON_TYPE_SET
);
165 // =======================================================================
167 // =======================================================================
169 static oberon_scope_t
*
170 oberon_open_scope(oberon_context_t
* ctx
)
172 oberon_scope_t
* scope
= calloc(1, sizeof *scope
);
173 oberon_object_t
* list
= calloc(1, sizeof *list
);
176 scope
-> list
= list
;
177 scope
-> up
= ctx
-> decl
;
181 scope
-> local
= scope
-> up
-> local
;
182 scope
-> parent
= scope
-> up
-> parent
;
183 scope
-> parent_type
= scope
-> up
-> parent_type
;
184 scope
-> exit_label
= scope
-> up
-> exit_label
;
192 oberon_close_scope(oberon_scope_t
* scope
)
194 oberon_context_t
* ctx
= scope
-> ctx
;
195 ctx
-> decl
= scope
-> up
;
198 static oberon_object_t
*
199 oberon_find_object_in_list(oberon_object_t
* list
, char * name
)
201 oberon_object_t
* x
= list
;
202 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
209 static oberon_object_t
*
210 oberon_find_object(oberon_scope_t
* scope
, char * name
, bool check_it
)
212 oberon_object_t
* result
= NULL
;
214 oberon_scope_t
* s
= scope
;
215 while(result
== NULL
&& s
!= NULL
)
217 result
= oberon_find_object_in_list(s
-> list
, name
);
221 if(check_it
&& result
== NULL
)
223 oberon_error(scope
-> ctx
, "undefined ident %s", name
);
229 static oberon_object_t
*
230 oberon_create_object(oberon_scope_t
* scope
, char * name
, int class, bool export
, bool read_only
)
232 oberon_object_t
* newvar
= malloc(sizeof *newvar
);
233 memset(newvar
, 0, sizeof *newvar
);
234 newvar
-> name
= name
;
235 newvar
-> class = class;
236 newvar
-> export
= export
;
237 newvar
-> read_only
= read_only
;
238 newvar
-> local
= scope
-> local
;
239 newvar
-> parent
= scope
-> parent
;
240 newvar
-> parent_type
= scope
-> parent_type
;
241 newvar
-> module
= scope
-> ctx
-> mod
;
245 static oberon_object_t
*
246 oberon_define_object(oberon_scope_t
* scope
, char * name
, int class, bool export
, bool read_only
, bool check_upscope
)
250 if(oberon_find_object(scope
-> up
, name
, false))
252 oberon_error(scope
-> ctx
, "already defined");
256 oberon_object_t
* x
= scope
-> list
;
257 while(x
-> next
&& strcmp(x
-> next
-> name
, name
) != 0)
264 oberon_error(scope
-> ctx
, "already defined");
267 oberon_object_t
* newvar
;
268 newvar
= oberon_create_object(scope
, name
, class, export
, read_only
);
274 static oberon_object_t
*
275 oberon_define_type(oberon_scope_t
* scope
, char * name
, oberon_type_t
* type
, int export
)
277 oberon_object_t
* id
;
278 id
= oberon_define_object(scope
, name
, OBERON_CLASS_TYPE
, export
, false, false);
280 oberon_generator_init_type(scope
-> ctx
, type
);
284 // =======================================================================
286 // =======================================================================
289 oberon_get_char(oberon_context_t
* ctx
)
291 if(ctx
-> code
[ctx
-> code_index
])
293 ctx
-> code_index
+= 1;
294 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
299 oberon_init_scaner(oberon_context_t
* ctx
, const char * code
)
302 ctx
-> code_index
= 0;
303 ctx
-> c
= ctx
-> code
[ctx
-> code_index
];
307 oberon_read_ident(oberon_context_t
* ctx
)
310 int i
= ctx
-> code_index
;
312 int c
= ctx
-> code
[i
];
320 char * ident
= malloc(len
+ 1);
321 memcpy(ident
, &ctx
->code
[ctx
->code_index
], len
);
324 ctx
-> code_index
= i
;
325 ctx
-> c
= ctx
-> code
[i
];
326 ctx
-> string
= ident
;
327 ctx
-> token
= IDENT
;
329 if(strcmp(ident
, "MODULE") == 0)
331 ctx
-> token
= MODULE
;
333 else if(strcmp(ident
, "END") == 0)
337 else if(strcmp(ident
, "VAR") == 0)
341 else if(strcmp(ident
, "BEGIN") == 0)
343 ctx
-> token
= BEGIN
;
345 else if(strcmp(ident
, "OR") == 0)
349 else if(strcmp(ident
, "DIV") == 0)
353 else if(strcmp(ident
, "MOD") == 0)
357 else if(strcmp(ident
, "PROCEDURE") == 0)
359 ctx
-> token
= PROCEDURE
;
361 else if(strcmp(ident
, "RETURN") == 0)
363 ctx
-> token
= RETURN
;
365 else if(strcmp(ident
, "CONST") == 0)
367 ctx
-> token
= CONST
;
369 else if(strcmp(ident
, "TYPE") == 0)
373 else if(strcmp(ident
, "ARRAY") == 0)
375 ctx
-> token
= ARRAY
;
377 else if(strcmp(ident
, "OF") == 0)
381 else if(strcmp(ident
, "RECORD") == 0)
383 ctx
-> token
= RECORD
;
385 else if(strcmp(ident
, "POINTER") == 0)
387 ctx
-> token
= POINTER
;
389 else if(strcmp(ident
, "TO") == 0)
393 else if(strcmp(ident
, "NIL") == 0)
397 else if(strcmp(ident
, "IMPORT") == 0)
399 ctx
-> token
= IMPORT
;
401 else if(strcmp(ident
, "IN") == 0)
405 else if(strcmp(ident
, "IS") == 0)
409 else if(strcmp(ident
, "IF") == 0)
413 else if(strcmp(ident
, "THEN") == 0)
417 else if(strcmp(ident
, "ELSE") == 0)
421 else if(strcmp(ident
, "ELSIF") == 0)
423 ctx
-> token
= ELSIF
;
425 else if(strcmp(ident
, "WHILE") == 0)
427 ctx
-> token
= WHILE
;
429 else if(strcmp(ident
, "DO") == 0)
433 else if(strcmp(ident
, "REPEAT") == 0)
435 ctx
-> token
= REPEAT
;
437 else if(strcmp(ident
, "UNTIL") == 0)
439 ctx
-> token
= UNTIL
;
441 else if(strcmp(ident
, "FOR") == 0)
445 else if(strcmp(ident
, "BY") == 0)
449 else if(strcmp(ident
, "LOOP") == 0)
453 else if(strcmp(ident
, "EXIT") == 0)
457 else if(strcmp(ident
, "CASE") == 0)
461 else if(strcmp(ident
, "WITH") == 0)
467 #define ISHEXDIGIT(x) \
468 (((x) >= '0' && (x) <= '9') || ((x) >= 'A' && (x) <= 'F'))
471 oberon_read_number(oberon_context_t
* ctx
)
484 * mode = 3 == LONGREAL
488 start_i
= ctx
-> code_index
;
490 while(isdigit(ctx
-> c
))
492 oberon_get_char(ctx
);
495 end_i
= ctx
-> code_index
;
497 if(ISHEXDIGIT(ctx
-> c
))
500 while(ISHEXDIGIT(ctx
-> c
))
502 oberon_get_char(ctx
);
505 end_i
= ctx
-> code_index
;
510 oberon_get_char(ctx
);
512 else if(ctx
-> c
== 'X')
515 oberon_get_char(ctx
);
519 oberon_error(ctx
, "invalid hex number");
522 else if(ctx
-> c
== '.')
524 oberon_get_char(ctx
);
527 /* Чит: избегаем конфликта с DOTDOT */
528 ctx
-> code_index
-= 1;
534 while(isdigit(ctx
-> c
))
536 oberon_get_char(ctx
);
539 if(ctx
-> c
== 'E' || ctx
-> c
== 'D')
541 exp_i
= ctx
-> code_index
;
548 oberon_get_char(ctx
);
550 if(ctx
-> c
== '+' || ctx
-> c
== '-')
552 oberon_get_char(ctx
);
555 while(isdigit(ctx
-> c
))
557 oberon_get_char(ctx
);
561 end_i
= ctx
-> code_index
;
569 oberon_get_char(ctx
);
571 else if(ctx
-> c
== 'X')
574 oberon_get_char(ctx
);
578 int len
= end_i
- start_i
;
579 ident
= malloc(len
+ 1);
580 memcpy(ident
, &ctx
-> code
[start_i
], len
);
583 ctx
-> longmode
= false;
586 int i
= exp_i
- start_i
;
588 ctx
-> longmode
= true;
594 integer
= atol(ident
);
596 ctx
-> token
= INTEGER
;
599 sscanf(ident
, "%lx", &integer
);
601 ctx
-> token
= INTEGER
;
605 sscanf(ident
, "%lf", &real
);
609 sscanf(ident
, "%lx", &integer
);
614 oberon_error(ctx
, "oberon_read_number: wat");
618 ctx
-> string
= ident
;
619 ctx
-> integer
= integer
;
624 oberon_skip_space(oberon_context_t
* ctx
)
626 while(isspace(ctx
-> c
))
628 oberon_get_char(ctx
);
633 oberon_read_comment(oberon_context_t
* ctx
)
640 oberon_get_char(ctx
);
643 oberon_get_char(ctx
);
647 else if(ctx
-> c
== '*')
649 oberon_get_char(ctx
);
652 oberon_get_char(ctx
);
656 else if(ctx
-> c
== 0)
658 oberon_error(ctx
, "unterminated comment");
662 oberon_get_char(ctx
);
667 static void oberon_read_string(oberon_context_t
* ctx
)
670 oberon_get_char(ctx
);
672 int start
= ctx
-> code_index
;
674 while(ctx
-> c
!= 0 && ctx
-> c
!= c
)
676 oberon_get_char(ctx
);
681 oberon_error(ctx
, "unterminated string");
684 int end
= ctx
-> code_index
;
686 oberon_get_char(ctx
);
688 char * string
= calloc(1, end
- start
+ 1);
689 strncpy(string
, &ctx
-> code
[start
], end
- start
);
691 ctx
-> token
= STRING
;
692 ctx
-> string
= string
;
695 static void oberon_read_token(oberon_context_t
* ctx
);
698 oberon_read_symbol(oberon_context_t
* ctx
)
707 ctx
-> token
= SEMICOLON
;
708 oberon_get_char(ctx
);
711 ctx
-> token
= COLON
;
712 oberon_get_char(ctx
);
715 ctx
-> token
= ASSIGN
;
716 oberon_get_char(ctx
);
721 oberon_get_char(ctx
);
724 ctx
-> token
= DOTDOT
;
725 oberon_get_char(ctx
);
729 ctx
-> token
= LPAREN
;
730 oberon_get_char(ctx
);
733 oberon_get_char(ctx
);
734 oberon_read_comment(ctx
);
735 oberon_read_token(ctx
);
739 ctx
-> token
= RPAREN
;
740 oberon_get_char(ctx
);
743 ctx
-> token
= EQUAL
;
744 oberon_get_char(ctx
);
748 oberon_get_char(ctx
);
752 oberon_get_char(ctx
);
756 oberon_get_char(ctx
);
760 ctx
-> token
= GREAT
;
761 oberon_get_char(ctx
);
765 oberon_get_char(ctx
);
770 oberon_get_char(ctx
);
773 ctx
-> token
= MINUS
;
774 oberon_get_char(ctx
);
778 oberon_get_char(ctx
);
781 oberon_get_char(ctx
);
782 oberon_error(ctx
, "unstarted comment");
786 ctx
-> token
= SLASH
;
787 oberon_get_char(ctx
);
791 oberon_get_char(ctx
);
795 oberon_get_char(ctx
);
798 ctx
-> token
= COMMA
;
799 oberon_get_char(ctx
);
802 ctx
-> token
= LBRACK
;
803 oberon_get_char(ctx
);
806 ctx
-> token
= RBRACK
;
807 oberon_get_char(ctx
);
810 ctx
-> token
= UPARROW
;
811 oberon_get_char(ctx
);
814 oberon_read_string(ctx
);
817 oberon_read_string(ctx
);
820 ctx
-> token
= LBRACE
;
821 oberon_get_char(ctx
);
824 ctx
-> token
= RBRACE
;
825 oberon_get_char(ctx
);
829 oberon_get_char(ctx
);
832 oberon_error(ctx
, "invalid char %c", ctx
-> c
);
838 oberon_read_token(oberon_context_t
* ctx
)
840 oberon_skip_space(ctx
);
845 oberon_read_ident(ctx
);
849 oberon_read_number(ctx
);
853 oberon_read_symbol(ctx
);
857 // =======================================================================
859 // =======================================================================
861 static void oberon_expect_token(oberon_context_t
* ctx
, int token
);
862 static oberon_expr_t
* oberon_expr(oberon_context_t
* ctx
);
863 static void oberon_assert_token(oberon_context_t
* ctx
, int token
);
864 static char * oberon_assert_ident(oberon_context_t
* ctx
);
865 static void oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
);
866 static oberon_item_t
* oberon_const_expr(oberon_context_t
* ctx
);
867 static oberon_expr_t
* oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
);
869 static oberon_expr_t
*
870 oberon_new_operator(int op
, oberon_type_t
* result
, oberon_expr_t
* left
, oberon_expr_t
* right
)
872 oberon_oper_t
* operator;
873 operator = malloc(sizeof *operator);
874 memset(operator, 0, sizeof *operator);
876 operator -> is_item
= 0;
877 operator -> result
= result
;
878 operator -> read_only
= 1;
880 operator -> left
= left
;
881 operator -> right
= right
;
883 return (oberon_expr_t
*) operator;
886 static oberon_expr_t
*
887 oberon_new_item(int mode
, oberon_type_t
* result
, int read_only
)
889 oberon_item_t
* item
;
890 item
= malloc(sizeof *item
);
891 memset(item
, 0, sizeof *item
);
894 item
-> result
= result
;
895 item
-> read_only
= read_only
;
898 return (oberon_expr_t
*)item
;
901 static oberon_expr_t
*
902 oberon_make_unary_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
)
904 oberon_expr_t
* expr
;
905 oberon_type_t
* result
;
907 result
= a
-> result
;
911 if(result
-> class == OBERON_TYPE_SET
)
913 expr
= oberon_new_operator(OP_COMPLEMENTATION
, result
, a
, NULL
);
915 else if(result
-> class == OBERON_TYPE_INTEGER
)
917 expr
= oberon_new_operator(OP_UNARY_MINUS
, result
, a
, NULL
);
921 oberon_error(ctx
, "incompatible operator type");
924 else if(token
== NOT
)
926 if(result
-> class != OBERON_TYPE_BOOLEAN
)
928 oberon_error(ctx
, "incompatible operator type");
931 expr
= oberon_new_operator(OP_LOGIC_NOT
, result
, a
, NULL
);
935 oberon_error(ctx
, "oberon_make_unary_op: wat");
942 oberon_expr_list(oberon_context_t
* ctx
, int * num_expr
, oberon_expr_t
** first
, int const_expr
)
944 oberon_expr_t
* last
;
949 *first
= last
= (oberon_expr_t
*) oberon_const_expr(ctx
);
953 *first
= last
= oberon_expr(ctx
);
955 while(ctx
-> token
== COMMA
)
957 oberon_assert_token(ctx
, COMMA
);
958 oberon_expr_t
* current
;
962 current
= (oberon_expr_t
*) oberon_const_expr(ctx
);
966 current
= oberon_expr(ctx
);
969 last
-> next
= current
;
975 static oberon_expr_t
*
976 oberon_cast_expr(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* pref
)
978 return oberon_new_operator(OP_CAST
, pref
, expr
, NULL
);
981 static oberon_expr_t
*
982 oberno_make_record_cast(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* rec
)
984 oberon_type_t
* from
= expr
-> result
;
985 oberon_type_t
* to
= rec
;
987 if(from
-> class == OBERON_TYPE_POINTER
&& to
-> class == OBERON_TYPE_POINTER
)
993 if(from
-> class != OBERON_TYPE_RECORD
|| to
-> class != OBERON_TYPE_RECORD
)
995 oberon_error(ctx
, "must be record type");
998 return oberon_cast_expr(ctx
, expr
, rec
);
1001 static oberon_type_t
*
1002 oberon_get_equal_expr_type(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
)
1004 oberon_type_t
* result
;
1005 if(a
-> class == OBERON_TYPE_REAL
&& b
-> class == OBERON_TYPE_INTEGER
)
1009 else if(b
-> class == OBERON_TYPE_REAL
&& a
-> class == OBERON_TYPE_INTEGER
)
1013 else if(a
-> class != b
-> class)
1015 oberon_error(ctx
, "oberon_get_equal_expr_type: incompatible types");
1017 else if(a
-> size
> b
-> size
)
1030 oberon_check_record_compatibility(oberon_context_t
* ctx
, oberon_type_t
* from
, oberon_type_t
* to
)
1032 if(from
-> class == OBERON_TYPE_POINTER
&& to
-> class == OBERON_TYPE_POINTER
)
1034 from
= from
-> base
;
1038 if(from
-> class != OBERON_TYPE_RECORD
|| to
-> class != OBERON_TYPE_RECORD
)
1040 oberon_error(ctx
, "not a record");
1043 oberon_type_t
* t
= from
;
1044 while(t
!= NULL
&& t
!= to
)
1051 oberon_error(ctx
, "incompatible record types");
1056 oberon_check_dst(oberon_context_t
* ctx
, oberon_expr_t
* dst
)
1058 if(dst
-> is_item
== false)
1060 oberon_error(ctx
, "not variable");
1063 switch(dst
-> item
.mode
)
1074 oberon_error(ctx
, "not variable");
1080 oberon_check_src(oberon_context_t
* ctx
, oberon_expr_t
* src
)
1084 if(src
-> item
.mode
== MODE_TYPE
)
1086 oberon_error(ctx
, "not variable");
1091 static oberon_expr_t
*
1092 oberon_autocast_to(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_type_t
* pref
)
1095 // Если классы типов равны
1096 // Если INTEGER переводится в REAL
1097 // Есди STRING переводится в CHAR
1098 // Есди STRING переводится в ARRAY OF CHAR
1100 oberon_check_src(ctx
, expr
);
1103 if(pref
-> class != expr
-> result
-> class)
1105 if(expr
-> result
-> class == OBERON_TYPE_STRING
)
1107 if(pref
-> class == OBERON_TYPE_CHAR
)
1109 if(expr
-> is_item
&& expr
-> item
.mode
== MODE_STRING
)
1111 if(strlen(expr
-> item
.string
) != 1)
1121 else if(pref
-> class == OBERON_TYPE_ARRAY
)
1123 if(pref
-> base
-> class != OBERON_TYPE_CHAR
)
1133 else if(expr
-> result
-> class == OBERON_TYPE_INTEGER
)
1135 if(pref
-> class != OBERON_TYPE_REAL
)
1148 oberon_error(ctx
, "oberon_autocast_to: incompatible types");
1151 if(pref
-> class == OBERON_TYPE_CHAR
)
1153 if(expr
-> result
-> class == OBERON_TYPE_STRING
)
1155 int c
= expr
-> item
.string
[0];
1156 expr
= oberon_new_item(MODE_CHAR
, ctx
-> char_type
, true);
1157 expr
-> item
.integer
= c
;
1160 else if(pref
-> class == OBERON_TYPE_INTEGER
|| pref
-> class == OBERON_TYPE_REAL
)
1162 if(expr
-> result
-> size
> pref
-> size
)
1164 oberon_error(ctx
, "incompatible size");
1168 expr
= oberon_cast_expr(ctx
, expr
, pref
);
1171 else if(pref
-> class == OBERON_TYPE_RECORD
)
1173 oberon_check_record_compatibility(ctx
, expr
-> result
, pref
);
1174 expr
= oberno_make_record_cast(ctx
, expr
, pref
);
1176 else if(pref
-> class == OBERON_TYPE_POINTER
)
1178 assert(pref
-> base
);
1179 if(expr
-> result
-> base
-> class == OBERON_TYPE_RECORD
)
1181 oberon_check_record_compatibility(ctx
, expr
-> result
, pref
);
1182 expr
= oberno_make_record_cast(ctx
, expr
, pref
);
1184 else if(expr
-> result
-> base
!= pref
-> base
)
1186 if(expr
-> result
-> base
-> class != OBERON_TYPE_VOID
)
1188 oberon_error(ctx
, "incompatible pointer types");
1197 oberon_autocast_binary_op(oberon_context_t
* ctx
, oberon_expr_t
** ea
, oberon_expr_t
** eb
)
1199 oberon_type_t
* a
= (*ea
) -> result
;
1200 oberon_type_t
* b
= (*eb
) -> result
;
1201 oberon_type_t
* preq
= oberon_get_equal_expr_type(ctx
, a
, b
);
1202 *ea
= oberon_autocast_to(ctx
, *ea
, preq
);
1203 *eb
= oberon_autocast_to(ctx
, *eb
, preq
);
1207 oberon_autocast_call(oberon_context_t
* ctx
, oberon_item_t
* desig
)
1209 if(desig
-> mode
!= MODE_CALL
)
1211 oberon_error(ctx
, "expected mode CALL");
1214 oberon_type_t
* fn
= desig
-> parent
-> result
;
1215 int num_args
= desig
-> num_args
;
1216 int num_decl
= fn
-> num_decl
;
1218 if(num_args
< num_decl
)
1220 oberon_error(ctx
, "too few arguments");
1222 else if(num_args
> num_decl
)
1224 oberon_error(ctx
, "too many arguments");
1227 /* Делаем проверку на запись и делаем автокаст */
1228 oberon_expr_t
* casted
[num_args
];
1229 oberon_expr_t
* arg
= desig
-> args
;
1230 oberon_object_t
* param
= fn
-> decl
;
1231 for(int i
= 0; i
< num_args
; i
++)
1233 if(param
-> class == OBERON_CLASS_VAR_PARAM
)
1235 if(arg
-> result
!= param
-> type
)
1237 oberon_error(ctx
, "incompatible type");
1239 if(arg
-> read_only
)
1241 oberon_error(ctx
, "assign to read-only var");
1247 casted
[i
] = oberon_autocast_to(ctx
, arg
, param
-> type
);
1251 param
= param
-> next
;
1254 /* Создаём новый список выражений */
1258 for(int i
= 0; i
< num_args
- 1; i
++)
1260 casted
[i
] -> next
= casted
[i
+ 1];
1262 desig
-> args
= arg
;
1266 static oberon_expr_t
*
1267 oberon_make_call_func(oberon_context_t
* ctx
, oberon_item_t
* item
, int num_args
, oberon_expr_t
* list_args
)
1269 oberon_type_t
* signature
= item
-> result
;
1270 if(signature
-> class != OBERON_TYPE_PROCEDURE
)
1272 oberon_error(ctx
, "not a procedure");
1275 oberon_expr_t
* call
;
1277 if(signature
-> sysproc
)
1279 if(signature
-> genfunc
== NULL
)
1281 oberon_error(ctx
, "not a function-procedure");
1284 call
= signature
-> genfunc(ctx
, num_args
, list_args
);
1288 if(signature
-> base
-> class == OBERON_TYPE_VOID
)
1290 oberon_error(ctx
, "attempt to call procedure in expression");
1293 call
= oberon_new_item(MODE_CALL
, signature
-> base
, true);
1294 call
-> item
.parent
= item
;
1295 call
-> item
.num_args
= num_args
;
1296 call
-> item
.args
= list_args
;
1297 oberon_autocast_call(ctx
, (oberon_item_t
*) call
);
1304 oberon_make_call_proc(oberon_context_t
* ctx
, oberon_item_t
* item
, int num_args
, oberon_expr_t
* list_args
)
1306 oberon_type_t
* signature
= item
-> result
;
1307 if(signature
-> class != OBERON_TYPE_PROCEDURE
)
1309 oberon_error(ctx
, "not a procedure");
1312 oberon_expr_t
* call
;
1314 if(signature
-> sysproc
)
1316 if(signature
-> genproc
== NULL
)
1318 oberon_error(ctx
, "not a procedure");
1321 signature
-> genproc(ctx
, num_args
, list_args
);
1325 if(signature
-> base
-> class != OBERON_TYPE_VOID
)
1327 oberon_error(ctx
, "attempt to call function as non-typed procedure");
1330 call
= oberon_new_item(MODE_CALL
, signature
-> base
, true);
1331 call
-> item
.parent
= item
;
1332 call
-> item
.num_args
= num_args
;
1333 call
-> item
.args
= list_args
;
1334 oberon_autocast_call(ctx
, (oberon_item_t
*) call
);
1335 oberon_generate_call_proc(ctx
, call
);
1343 || ((x) == INTEGER) \
1346 || ((x) == STRING) \
1348 || ((x) == LPAREN) \
1351 static oberon_expr_t
*
1352 oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1354 if(expr
-> result
-> class != OBERON_TYPE_POINTER
)
1356 oberon_error(ctx
, "not a pointer");
1359 assert(expr
-> is_item
);
1361 oberon_expr_t
* selector
;
1362 selector
= oberon_new_item(MODE_DEREF
, expr
-> result
-> base
, expr
-> read_only
);
1363 selector
-> item
.parent
= (oberon_item_t
*) expr
;
1368 static oberon_expr_t
*
1369 oberon_make_array_selector(oberon_context_t
* ctx
, oberon_expr_t
* desig
, oberon_expr_t
* index
)
1371 if(desig
-> result
-> class == OBERON_TYPE_POINTER
)
1373 desig
= oberno_make_dereferencing(ctx
, desig
);
1376 assert(desig
-> is_item
);
1378 if(desig
-> result
-> class != OBERON_TYPE_ARRAY
)
1380 oberon_error(ctx
, "not array");
1383 oberon_type_t
* base
;
1384 base
= desig
-> result
-> base
;
1386 if(index
-> result
-> class != OBERON_TYPE_INTEGER
)
1388 oberon_error(ctx
, "index must be integer");
1391 // Статическая проверка границ массива
1392 if(desig
-> result
-> size
!= 0)
1394 if(index
-> is_item
)
1396 if(index
-> item
.mode
== MODE_INTEGER
)
1398 int arr_size
= desig
-> result
-> size
;
1399 int index_int
= index
-> item
.integer
;
1400 if(index_int
< 0 || index_int
> arr_size
- 1)
1402 oberon_error(ctx
, "not in range (dimension size 0..%i)", arr_size
- 1);
1408 oberon_expr_t
* selector
;
1409 selector
= oberon_new_item(MODE_INDEX
, base
, desig
-> read_only
);
1410 selector
-> item
.parent
= (oberon_item_t
*) desig
;
1411 selector
-> item
.num_args
= 1;
1412 selector
-> item
.args
= index
;
1417 static oberon_expr_t
*
1418 oberon_make_record_selector(oberon_context_t
* ctx
, oberon_expr_t
* expr
, char * name
)
1420 if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
1422 expr
= oberno_make_dereferencing(ctx
, expr
);
1425 assert(expr
-> is_item
);
1427 if(expr
-> result
-> class != OBERON_TYPE_RECORD
)
1429 oberon_error(ctx
, "not record");
1432 oberon_type_t
* rec
= expr
-> result
;
1434 oberon_object_t
* field
;
1435 field
= oberon_find_object(rec
-> scope
, name
, true);
1437 if(field
-> export
== 0)
1439 if(field
-> module
!= ctx
-> mod
)
1441 oberon_error(ctx
, "field not exported");
1446 if(field
-> read_only
)
1448 if(field
-> module
!= ctx
-> mod
)
1454 oberon_expr_t
* selector
;
1455 selector
= oberon_new_item(MODE_FIELD
, field
-> type
, read_only
);
1456 selector
-> item
.var
= field
;
1457 selector
-> item
.parent
= (oberon_item_t
*) expr
;
1462 #define ISSELECTOR(x) \
1465 || ((x) == UPARROW) \
1468 static oberon_object_t
*
1469 oberon_qualident(oberon_context_t
* ctx
, char ** xname
, int check
)
1472 oberon_object_t
* x
;
1474 name
= oberon_assert_ident(ctx
);
1475 x
= oberon_find_object(ctx
-> decl
, name
, check
);
1479 if(x
-> class == OBERON_CLASS_MODULE
)
1481 oberon_assert_token(ctx
, DOT
);
1482 name
= oberon_assert_ident(ctx
);
1483 /* Наличие объектов в левых модулях всегда проверяется */
1484 x
= oberon_find_object(x
-> module
-> decl
, name
, 1);
1486 if(x
-> export
== 0)
1488 oberon_error(ctx
, "not exported");
1501 static oberon_expr_t
*
1502 oberon_ident_item(oberon_context_t
* ctx
, char * name
)
1505 oberon_object_t
* x
;
1506 oberon_expr_t
* expr
;
1508 x
= oberon_find_object(ctx
-> decl
, name
, true);
1511 if(x
-> class == OBERON_CLASS_CONST
|| x
-> class == OBERON_CLASS_PROC
)
1516 expr
= oberon_new_item(MODE_VAR
, x
-> type
, read_only
);
1517 expr
-> item
.var
= x
;
1521 static oberon_expr_t
*
1522 oberon_qualident_expr(oberon_context_t
* ctx
)
1524 oberon_object_t
* var
;
1525 oberon_expr_t
* expr
;
1527 var
= oberon_qualident(ctx
, NULL
, 1);
1530 if(var
-> read_only
)
1532 if(var
-> module
!= ctx
-> mod
)
1538 switch(var
-> class)
1540 case OBERON_CLASS_CONST
:
1542 expr
= (oberon_expr_t
*) var
-> value
;
1544 case OBERON_CLASS_TYPE
:
1545 expr
= oberon_new_item(MODE_TYPE
, var
-> type
, read_only
);
1547 case OBERON_CLASS_VAR
:
1548 case OBERON_CLASS_VAR_PARAM
:
1549 case OBERON_CLASS_PARAM
:
1550 expr
= oberon_new_item(MODE_VAR
, var
-> type
, read_only
);
1552 case OBERON_CLASS_PROC
:
1553 expr
= oberon_new_item(MODE_VAR
, var
-> type
, true);
1556 oberon_error(ctx
, "invalid designator");
1560 expr
-> item
.var
= var
;
1565 static oberon_expr_t
*
1566 oberon_designator(oberon_context_t
* ctx
)
1569 oberon_expr_t
* expr
;
1571 expr
= oberon_qualident_expr(ctx
);
1573 while(expr
-> result
-> class != OBERON_TYPE_PROCEDURE
&& ISSELECTOR(ctx
-> token
))
1575 switch(ctx
-> token
)
1578 oberon_assert_token(ctx
, DOT
);
1579 name
= oberon_assert_ident(ctx
);
1580 expr
= oberon_make_record_selector(ctx
, expr
, name
);
1583 oberon_assert_token(ctx
, LBRACK
);
1584 int num_indexes
= 0;
1585 oberon_expr_t
* indexes
= NULL
;
1586 oberon_expr_list(ctx
, &num_indexes
, &indexes
, 0);
1587 oberon_assert_token(ctx
, RBRACK
);
1589 for(int i
= 0; i
< num_indexes
; i
++)
1591 expr
= oberon_make_array_selector(ctx
, expr
, indexes
);
1592 indexes
= indexes
-> next
;
1596 oberon_assert_token(ctx
, UPARROW
);
1597 expr
= oberno_make_dereferencing(ctx
, expr
);
1600 oberon_assert_token(ctx
, LPAREN
);
1601 oberon_object_t
* objtype
= oberon_qualident(ctx
, NULL
, 1);
1602 if(objtype
-> class != OBERON_CLASS_TYPE
)
1604 oberon_error(ctx
, "must be type");
1606 oberon_assert_token(ctx
, RPAREN
);
1607 expr
= oberno_make_record_cast(ctx
, expr
, objtype
-> type
);
1610 oberon_error(ctx
, "oberon_designator: wat");
1618 static oberon_expr_t
*
1619 oberon_opt_func_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1621 /* Если есть скобки - значит вызов. Если нет, то передаём указатель. */
1622 if(ctx
-> token
== LPAREN
)
1624 oberon_assert_token(ctx
, LPAREN
);
1627 oberon_expr_t
* arguments
= NULL
;
1629 if(ISEXPR(ctx
-> token
))
1631 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
1634 assert(expr
-> is_item
== 1);
1635 expr
= oberon_make_call_func(ctx
, (oberon_item_t
*) expr
, num_args
, arguments
);
1637 oberon_assert_token(ctx
, RPAREN
);
1644 oberon_opt_proc_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1646 assert(expr
-> is_item
);
1649 oberon_expr_t
* arguments
= NULL
;
1651 if(ctx
-> token
== LPAREN
)
1653 oberon_assert_token(ctx
, LPAREN
);
1655 if(ISEXPR(ctx
-> token
))
1657 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
1660 oberon_assert_token(ctx
, RPAREN
);
1663 /* Вызов происходит даже без скобок */
1664 oberon_make_call_proc(ctx
, (oberon_item_t
*) expr
, num_args
, arguments
);
1667 static oberon_type_t
*
1668 oberon_get_type_of_int_value(oberon_context_t
* ctx
, int64_t i
)
1670 if(i
>= -128 && i
<= 127)
1672 return ctx
-> byte_type
;
1674 else if(i
>= -32768 && i
<= 32767)
1676 return ctx
-> shortint_type
;
1678 else if(i
>= -2147483648 && i
<= 2147483647)
1680 return ctx
-> int_type
;
1684 return ctx
-> longint_type
;
1688 static oberon_expr_t
*
1689 oberon_integer_item(oberon_context_t
* ctx
, int64_t i
)
1691 oberon_expr_t
* expr
;
1692 oberon_type_t
* result
;
1693 result
= oberon_get_type_of_int_value(ctx
, i
);
1694 expr
= oberon_new_item(MODE_INTEGER
, result
, true);
1695 expr
-> item
.integer
= i
;
1699 static oberon_expr_t
*
1700 oberon_element(oberon_context_t
* ctx
)
1705 e1
= oberon_expr(ctx
);
1706 if(e1
-> result
-> class != OBERON_TYPE_INTEGER
)
1708 oberon_error(ctx
, "expected integer");
1712 if(ctx
-> token
== DOTDOT
)
1714 oberon_assert_token(ctx
, DOTDOT
);
1715 e2
= oberon_expr(ctx
);
1716 if(e2
-> result
-> class != OBERON_TYPE_INTEGER
)
1718 oberon_error(ctx
, "expected integer");
1722 oberon_expr_t
* set
;
1723 set
= oberon_new_operator(OP_RANGE
, ctx
-> set_type
, e1
, e2
);
1727 static oberon_expr_t
*
1728 oberon_set(oberon_context_t
* ctx
)
1730 oberon_expr_t
* set
;
1731 oberon_expr_t
* elements
;
1732 set
= oberon_new_item(MODE_SET
, ctx
-> set_type
, true);
1733 set
-> item
.integer
= 0;
1735 oberon_assert_token(ctx
, LBRACE
);
1736 if(ISEXPR(ctx
-> token
))
1738 elements
= oberon_element(ctx
);
1739 set
= oberon_new_operator(OP_UNION
, ctx
-> set_type
, set
, elements
);
1740 while(ctx
-> token
== COMMA
)
1742 oberon_assert_token(ctx
, COMMA
);
1743 elements
= oberon_element(ctx
);
1744 set
= oberon_new_operator(OP_UNION
, ctx
-> set_type
, set
, elements
);
1747 oberon_assert_token(ctx
, RBRACE
);
1752 static oberon_expr_t
*
1753 oberon_make_boolean(oberon_context_t
* ctx
, bool cond
)
1755 oberon_expr_t
* expr
;
1756 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
, true);
1757 expr
-> item
.integer
= cond
;
1761 static oberon_expr_t
*
1762 oberon_factor(oberon_context_t
* ctx
)
1764 oberon_expr_t
* expr
;
1765 oberon_type_t
* result
;
1767 switch(ctx
-> token
)
1770 expr
= oberon_designator(ctx
);
1771 expr
= oberon_opt_func_parens(ctx
, expr
);
1774 expr
= oberon_integer_item(ctx
, ctx
-> integer
);
1775 oberon_assert_token(ctx
, INTEGER
);
1778 result
= ctx
-> char_type
;
1779 expr
= oberon_new_item(MODE_CHAR
, result
, true);
1780 expr
-> item
.integer
= ctx
-> integer
;
1781 oberon_assert_token(ctx
, CHAR
);
1784 result
= ctx
-> string_type
;
1785 expr
= oberon_new_item(MODE_STRING
, result
, true);
1786 expr
-> item
.string
= ctx
-> string
;
1787 oberon_assert_token(ctx
, STRING
);
1790 result
= (ctx
-> longmode
) ? (ctx
-> longreal_type
) : (ctx
-> real_type
);
1791 expr
= oberon_new_item(MODE_REAL
, result
, 1);
1792 expr
-> item
.real
= ctx
-> real
;
1793 oberon_assert_token(ctx
, REAL
);
1796 expr
= oberon_set(ctx
);
1799 oberon_assert_token(ctx
, LPAREN
);
1800 expr
= oberon_expr(ctx
);
1801 oberon_assert_token(ctx
, RPAREN
);
1804 oberon_assert_token(ctx
, NOT
);
1805 expr
= oberon_factor(ctx
);
1806 expr
= oberon_make_unary_op(ctx
, NOT
, expr
);
1809 oberon_assert_token(ctx
, NIL
);
1810 expr
= oberon_new_item(MODE_NIL
, ctx
-> void_ptr_type
, true);
1813 oberon_error(ctx
, "invalid expression");
1819 #define ITMAKESBOOLEAN(x) \
1820 (((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
1822 #define ITUSEONLYINTEGER(x) \
1823 ((x) >= LESS && (x) <= GEQ)
1825 #define ITUSEONLYBOOLEAN(x) \
1826 (((x) == OR) || ((x) == AND))
1829 oberon_autocast_to_real(oberon_context_t
* ctx
, oberon_expr_t
** e
)
1831 oberon_expr_t
* expr
= *e
;
1832 if(expr
-> result
-> class == OBERON_TYPE_INTEGER
)
1834 if(expr
-> result
-> size
<= ctx
-> real_type
-> size
)
1836 *e
= oberon_cast_expr(ctx
, expr
, ctx
-> real_type
);
1840 *e
= oberon_cast_expr(ctx
, expr
, ctx
-> longreal_type
);
1843 else if(expr
-> result
-> class != OBERON_TYPE_REAL
)
1845 oberon_error(ctx
, "required numeric type");
1849 static oberon_expr_t
*
1850 oberon_make_bin_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
, oberon_expr_t
* b
)
1852 oberon_expr_t
* expr
;
1853 oberon_type_t
* result
;
1858 if(a
-> result
-> class != OBERON_TYPE_INTEGER
)
1860 oberon_error(ctx
, "must be integer");
1863 if(b
-> result
-> class != OBERON_TYPE_SET
)
1865 oberon_error(ctx
, "must be set");
1868 result
= ctx
-> bool_type
;
1869 expr
= oberon_new_operator(OP_IN
, result
, a
, b
);
1871 else if(token
== IS
)
1873 oberon_type_t
* v
= a
-> result
;
1874 if(v
-> class == OBERON_TYPE_POINTER
)
1877 if(v
-> class != OBERON_TYPE_RECORD
)
1879 oberon_error(ctx
, "must be record");
1882 else if(v
-> class != OBERON_TYPE_RECORD
)
1884 oberon_error(ctx
, "must be record");
1887 if(b
-> is_item
== false || b
-> item
.mode
!= MODE_TYPE
)
1889 oberon_error(ctx
, "requires type");
1892 oberon_type_t
* t
= b
-> result
;
1893 if(t
-> class == OBERON_TYPE_POINTER
)
1896 if(t
-> class != OBERON_TYPE_RECORD
)
1898 oberon_error(ctx
, "must be record");
1901 else if(t
-> class != OBERON_TYPE_RECORD
)
1903 oberon_error(ctx
, "must be record");
1906 result
= ctx
-> bool_type
;
1907 expr
= oberon_new_operator(OP_IS
, result
, a
, b
);
1909 else if(ITMAKESBOOLEAN(token
))
1911 if(ITUSEONLYINTEGER(token
))
1913 if(a
-> result
-> class == OBERON_TYPE_INTEGER
1914 || b
-> result
-> class == OBERON_TYPE_INTEGER
1915 || a
-> result
-> class == OBERON_TYPE_REAL
1916 || b
-> result
-> class == OBERON_TYPE_REAL
)
1922 oberon_error(ctx
, "used only with numeric types");
1925 else if(ITUSEONLYBOOLEAN(token
))
1927 if(a
-> result
-> class != OBERON_TYPE_BOOLEAN
1928 || b
-> result
-> class != OBERON_TYPE_BOOLEAN
)
1930 oberon_error(ctx
, "used only with boolean type");
1934 oberon_autocast_binary_op(ctx
, &a
, &b
);
1935 result
= ctx
-> bool_type
;
1939 expr
= oberon_new_operator(OP_EQ
, result
, a
, b
);
1941 else if(token
== NEQ
)
1943 expr
= oberon_new_operator(OP_NEQ
, result
, a
, b
);
1945 else if(token
== LESS
)
1947 expr
= oberon_new_operator(OP_LSS
, result
, a
, b
);
1949 else if(token
== LEQ
)
1951 expr
= oberon_new_operator(OP_LEQ
, result
, a
, b
);
1953 else if(token
== GREAT
)
1955 expr
= oberon_new_operator(OP_GRT
, result
, a
, b
);
1957 else if(token
== GEQ
)
1959 expr
= oberon_new_operator(OP_GEQ
, result
, a
, b
);
1961 else if(token
== OR
)
1963 expr
= oberon_new_operator(OP_LOGIC_OR
, result
, a
, b
);
1965 else if(token
== AND
)
1967 expr
= oberon_new_operator(OP_LOGIC_AND
, result
, a
, b
);
1971 oberon_error(ctx
, "oberon_make_bin_op: bool wat");
1974 else if(token
== SLASH
)
1976 if(a
-> result
-> class == OBERON_TYPE_SET
1977 || b
-> result
-> class == OBERON_TYPE_SET
)
1979 oberon_autocast_binary_op(ctx
, &a
, &b
);
1980 result
= a
-> result
;
1981 expr
= oberon_new_operator(OP_SYM_DIFFERENCE
, result
, a
, b
);
1985 oberon_autocast_to_real(ctx
, &a
);
1986 oberon_autocast_to_real(ctx
, &b
);
1987 oberon_autocast_binary_op(ctx
, &a
, &b
);
1988 result
= a
-> result
;
1989 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
1992 else if(token
== DIV
)
1994 if(a
-> result
-> class != OBERON_TYPE_INTEGER
1995 || b
-> result
-> class != OBERON_TYPE_INTEGER
)
1997 oberon_error(ctx
, "operator DIV requires integer type");
2000 oberon_autocast_binary_op(ctx
, &a
, &b
);
2001 expr
= oberon_new_operator(OP_DIV
, a
-> result
, a
, b
);
2005 oberon_autocast_binary_op(ctx
, &a
, &b
);
2006 result
= a
-> result
;
2007 if(result
-> class == OBERON_TYPE_SET
)
2012 expr
= oberon_new_operator(OP_UNION
, result
, a
, b
);
2015 expr
= oberon_new_operator(OP_DIFFERENCE
, result
, a
, b
);
2018 expr
= oberon_new_operator(OP_INTERSECTION
, result
, a
, b
);
2025 else if(result
-> class == OBERON_TYPE_INTEGER
2026 || result
-> class == OBERON_TYPE_REAL
)
2031 expr
= oberon_new_operator(OP_ADD
, result
, a
, b
);
2034 expr
= oberon_new_operator(OP_SUB
, result
, a
, b
);
2037 expr
= oberon_new_operator(OP_MUL
, result
, a
, b
);
2040 expr
= oberon_new_operator(OP_MOD
, result
, a
, b
);
2055 oberon_error(ctx
, "invalid operation");
2061 #define ISMULOP(x) \
2062 ((x) >= STAR && (x) <= AND)
2064 static oberon_expr_t
*
2065 oberon_term_expr(oberon_context_t
* ctx
)
2067 oberon_expr_t
* expr
;
2069 expr
= oberon_factor(ctx
);
2070 while(ISMULOP(ctx
-> token
))
2072 int token
= ctx
-> token
;
2073 oberon_read_token(ctx
);
2075 oberon_expr_t
* inter
= oberon_factor(ctx
);
2076 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2082 #define ISADDOP(x) \
2083 ((x) >= PLUS && (x) <= OR)
2085 static oberon_expr_t
*
2086 oberon_simple_expr(oberon_context_t
* ctx
)
2088 oberon_expr_t
* expr
;
2091 if(ctx
-> token
== PLUS
)
2094 oberon_assert_token(ctx
, PLUS
);
2096 else if(ctx
-> token
== MINUS
)
2099 oberon_assert_token(ctx
, MINUS
);
2102 expr
= oberon_term_expr(ctx
);
2106 expr
= oberon_make_unary_op(ctx
, MINUS
, expr
);
2109 while(ISADDOP(ctx
-> token
))
2111 int token
= ctx
-> token
;
2112 oberon_read_token(ctx
);
2114 oberon_expr_t
* inter
= oberon_term_expr(ctx
);
2115 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2121 #define ISRELATION(x) \
2122 ((x) >= EQUAL && (x) <= IS)
2124 static oberon_expr_t
*
2125 oberon_expr(oberon_context_t
* ctx
)
2127 oberon_expr_t
* expr
;
2129 expr
= oberon_simple_expr(ctx
);
2130 while(ISRELATION(ctx
-> token
))
2132 int token
= ctx
-> token
;
2133 oberon_read_token(ctx
);
2135 oberon_expr_t
* inter
= oberon_simple_expr(ctx
);
2136 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2143 oberon_check_const(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
2145 if(expr
-> is_item
== 0)
2147 oberon_error(ctx
, "const expression are required");
2150 switch(expr
-> item
.mode
)
2162 oberon_error(ctx
, "const expression are required");
2167 static oberon_item_t
*
2168 oberon_const_expr(oberon_context_t
* ctx
)
2170 oberon_expr_t
* expr
;
2171 expr
= oberon_expr(ctx
);
2172 oberon_check_const(ctx
, expr
);
2173 return (oberon_item_t
*) expr
;
2176 // =======================================================================
2178 // =======================================================================
2180 static void oberon_decl_seq(oberon_context_t
* ctx
);
2181 static void oberon_statement_seq(oberon_context_t
* ctx
);
2182 static void oberon_initialize_decl(oberon_context_t
* ctx
);
2185 oberon_expect_token(oberon_context_t
* ctx
, int token
)
2187 if(ctx
-> token
!= token
)
2189 oberon_error(ctx
, "unexpected token %i (%i)", ctx
-> token
, token
);
2194 oberon_assert_token(oberon_context_t
* ctx
, int token
)
2196 oberon_expect_token(ctx
, token
);
2197 oberon_read_token(ctx
);
2201 oberon_assert_ident(oberon_context_t
* ctx
)
2203 oberon_expect_token(ctx
, IDENT
);
2204 char * ident
= ctx
-> string
;
2205 oberon_read_token(ctx
);
2210 oberon_def(oberon_context_t
* ctx
, int * export
, int * read_only
)
2212 switch(ctx
-> token
)
2215 oberon_assert_token(ctx
, STAR
);
2220 oberon_assert_token(ctx
, MINUS
);
2231 static oberon_object_t
*
2232 oberon_ident_def(oberon_context_t
* ctx
, int class, bool check_upscope
)
2237 oberon_object_t
* x
;
2239 name
= oberon_assert_ident(ctx
);
2240 oberon_def(ctx
, &export
, &read_only
);
2242 x
= oberon_define_object(ctx
-> decl
, name
, class, export
, read_only
, check_upscope
);
2247 oberon_ident_list(oberon_context_t
* ctx
, int class, bool check_upscope
, int * num
, oberon_object_t
** list
)
2250 *list
= oberon_ident_def(ctx
, class, check_upscope
);
2251 while(ctx
-> token
== COMMA
)
2253 oberon_assert_token(ctx
, COMMA
);
2254 oberon_ident_def(ctx
, class, check_upscope
);
2260 oberon_var_decl(oberon_context_t
* ctx
)
2263 oberon_object_t
* list
;
2264 oberon_type_t
* type
;
2265 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2267 oberon_ident_list(ctx
, OBERON_CLASS_VAR
, false, &num
, &list
);
2268 oberon_assert_token(ctx
, COLON
);
2269 oberon_type(ctx
, &type
);
2271 oberon_object_t
* var
= list
;
2272 for(int i
= 0; i
< num
; i
++)
2279 static oberon_object_t
*
2280 oberon_fp_section(oberon_context_t
* ctx
, int * num_decl
)
2282 int class = OBERON_CLASS_PARAM
;
2283 if(ctx
-> token
== VAR
)
2285 oberon_read_token(ctx
);
2286 class = OBERON_CLASS_VAR_PARAM
;
2290 oberon_object_t
* list
;
2291 oberon_ident_list(ctx
, class, false, &num
, &list
);
2293 oberon_assert_token(ctx
, COLON
);
2295 oberon_type_t
* type
;
2296 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2297 oberon_type(ctx
, &type
);
2299 oberon_object_t
* param
= list
;
2300 for(int i
= 0; i
< num
; i
++)
2302 param
-> type
= type
;
2303 param
= param
-> next
;
2310 #define ISFPSECTION \
2311 ((ctx -> token == VAR) || (ctx -> token == IDENT))
2314 oberon_formal_pars(oberon_context_t
* ctx
, oberon_type_t
* signature
)
2316 oberon_assert_token(ctx
, LPAREN
);
2320 signature
-> decl
= oberon_fp_section(ctx
, &signature
-> num_decl
);
2321 while(ctx
-> token
== SEMICOLON
)
2323 oberon_assert_token(ctx
, SEMICOLON
);
2324 oberon_fp_section(ctx
, &signature
-> num_decl
);
2328 oberon_assert_token(ctx
, RPAREN
);
2330 if(ctx
-> token
== COLON
)
2332 oberon_assert_token(ctx
, COLON
);
2334 oberon_object_t
* typeobj
;
2335 typeobj
= oberon_qualident(ctx
, NULL
, 1);
2336 if(typeobj
-> class != OBERON_CLASS_TYPE
)
2338 oberon_error(ctx
, "function result is not type");
2340 signature
-> base
= typeobj
-> type
;
2345 oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
)
2347 oberon_type_t
* signature
;
2349 signature
-> class = OBERON_TYPE_PROCEDURE
;
2350 signature
-> num_decl
= 0;
2351 signature
-> base
= ctx
-> void_type
;
2352 signature
-> decl
= NULL
;
2354 if(ctx
-> token
== LPAREN
)
2356 oberon_formal_pars(ctx
, signature
);
2361 oberon_compare_signatures(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
)
2363 if(a
-> num_decl
!= b
-> num_decl
)
2365 oberon_error(ctx
, "number parameters not matched");
2368 int num_param
= a
-> num_decl
;
2369 oberon_object_t
* param_a
= a
-> decl
;
2370 oberon_object_t
* param_b
= b
-> decl
;
2371 for(int i
= 0; i
< num_param
; i
++)
2373 if(strcmp(param_a
-> name
, param_b
-> name
) != 0)
2375 oberon_error(ctx
, "param %i name not matched", i
+ 1);
2378 if(param_a
-> type
!= param_b
-> type
)
2380 oberon_error(ctx
, "param %i type not matched", i
+ 1);
2383 param_a
= param_a
-> next
;
2384 param_b
= param_b
-> next
;
2389 oberon_make_return(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
2391 oberon_object_t
* proc
= ctx
-> decl
-> parent
;
2392 oberon_type_t
* result_type
= proc
-> type
-> base
;
2394 if(result_type
-> class == OBERON_TYPE_VOID
)
2398 oberon_error(ctx
, "procedure has no result type");
2405 oberon_error(ctx
, "procedure requires expression on result");
2408 expr
= oberon_autocast_to(ctx
, expr
, result_type
);
2411 proc
-> has_return
= 1;
2413 oberon_generate_return(ctx
, expr
);
2417 oberon_proc_decl_body(oberon_context_t
* ctx
, oberon_object_t
* proc
)
2419 oberon_assert_token(ctx
, SEMICOLON
);
2421 ctx
-> decl
= proc
-> scope
;
2423 oberon_decl_seq(ctx
);
2425 oberon_generate_begin_proc(ctx
, proc
);
2427 if(ctx
-> token
== BEGIN
)
2429 oberon_assert_token(ctx
, BEGIN
);
2430 oberon_statement_seq(ctx
);
2433 oberon_assert_token(ctx
, END
);
2434 char * name
= oberon_assert_ident(ctx
);
2435 if(strcmp(name
, proc
-> name
) != 0)
2437 oberon_error(ctx
, "procedure name not matched");
2440 if(proc
-> type
-> base
-> class == OBERON_TYPE_VOID
2441 && proc
-> has_return
== 0)
2443 oberon_make_return(ctx
, NULL
);
2446 if(proc
-> has_return
== 0)
2448 oberon_error(ctx
, "procedure requires return");
2451 oberon_generate_end_proc(ctx
);
2452 oberon_close_scope(ctx
-> decl
);
2456 oberon_proc_decl(oberon_context_t
* ctx
)
2458 oberon_assert_token(ctx
, PROCEDURE
);
2461 if(ctx
-> token
== UPARROW
)
2463 oberon_assert_token(ctx
, UPARROW
);
2470 name
= oberon_assert_ident(ctx
);
2471 oberon_def(ctx
, &export
, &read_only
);
2473 oberon_scope_t
* proc_scope
;
2474 proc_scope
= oberon_open_scope(ctx
);
2475 ctx
-> decl
-> local
= 1;
2477 oberon_type_t
* signature
;
2478 signature
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2479 oberon_opt_formal_pars(ctx
, &signature
);
2481 //oberon_initialize_decl(ctx);
2482 oberon_generator_init_type(ctx
, signature
);
2483 oberon_close_scope(ctx
-> decl
);
2485 oberon_object_t
* proc
;
2486 proc
= oberon_find_object(ctx
-> decl
, name
, 0);
2489 proc
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_PROC
, export
, read_only
, false);
2490 proc
-> type
= signature
;
2491 proc
-> scope
= proc_scope
;
2492 oberon_generator_init_proc(ctx
, proc
);
2496 if(proc
-> class != OBERON_CLASS_PROC
)
2498 oberon_error(ctx
, "mult definition");
2505 oberon_error(ctx
, "mult procedure definition");
2509 if(proc
-> export
!= export
|| proc
-> read_only
!= read_only
)
2511 oberon_error(ctx
, "export type not matched");
2514 oberon_compare_signatures(ctx
, proc
-> type
, signature
);
2517 proc_scope
-> parent
= proc
;
2518 oberon_object_t
* param
= proc_scope
-> list
-> next
;
2521 param
-> parent
= proc
;
2522 param
= param
-> next
;
2528 oberon_proc_decl_body(ctx
, proc
);
2533 oberon_const_decl(oberon_context_t
* ctx
)
2535 oberon_item_t
* value
;
2536 oberon_object_t
* constant
;
2538 constant
= oberon_ident_def(ctx
, OBERON_CLASS_CONST
, false);
2539 oberon_assert_token(ctx
, EQUAL
);
2540 value
= oberon_const_expr(ctx
);
2541 constant
-> value
= value
;
2545 oberon_make_array_type(oberon_context_t
* ctx
, oberon_expr_t
* size
, oberon_type_t
* base
, oberon_type_t
** type
)
2547 if(size
-> is_item
== 0)
2549 oberon_error(ctx
, "requires constant");
2552 if(size
-> item
.mode
!= MODE_INTEGER
)
2554 oberon_error(ctx
, "requires integer constant");
2557 oberon_type_t
* arr
;
2559 arr
-> class = OBERON_TYPE_ARRAY
;
2560 arr
-> size
= size
-> item
.integer
;
2565 oberon_qualident_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
2568 oberon_object_t
* to
;
2570 to
= oberon_qualident(ctx
, &name
, 0);
2572 //name = oberon_assert_ident(ctx);
2573 //to = oberon_find_object(ctx -> decl, name, 0);
2577 if(to
-> class != OBERON_CLASS_TYPE
)
2579 oberon_error(ctx
, "not a type");
2584 to
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
, false, false, false);
2585 to
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2591 static void oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
);
2594 * Правило граматики "type". Указатель type должен указывать на существующий объект!
2598 oberon_make_multiarray(oberon_context_t
* ctx
, oberon_expr_t
* sizes
, oberon_type_t
* base
, oberon_type_t
** type
)
2606 oberon_type_t
* dim
;
2607 dim
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2609 oberon_make_multiarray(ctx
, sizes
-> next
, base
, &dim
);
2611 oberon_make_array_type(ctx
, sizes
, dim
, type
);
2615 oberon_make_open_array(oberon_context_t
* ctx
, oberon_type_t
* base
, oberon_type_t
* type
)
2617 type
-> class = OBERON_TYPE_ARRAY
;
2619 type
-> base
= base
;
2623 oberon_field_list(oberon_context_t
* ctx
, oberon_type_t
* rec
, oberon_scope_t
* modscope
)
2625 if(ctx
-> token
== IDENT
)
2628 oberon_object_t
* list
;
2629 oberon_type_t
* type
;
2630 type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2632 oberon_ident_list(ctx
, OBERON_CLASS_FIELD
, true, &num
, &list
);
2633 oberon_assert_token(ctx
, COLON
);
2635 oberon_scope_t
* current
= ctx
-> decl
;
2636 ctx
-> decl
= modscope
;
2637 oberon_type(ctx
, &type
);
2638 ctx
-> decl
= current
;
2640 oberon_object_t
* field
= list
;
2641 for(int i
= 0; i
< num
; i
++)
2643 field
-> type
= type
;
2644 field
= field
-> next
;
2647 rec
-> num_decl
+= num
;
2652 oberon_type_record_body(oberon_context_t
* ctx
, oberon_type_t
* rec
)
2654 oberon_scope_t
* modscope
= ctx
-> mod
-> decl
;
2655 oberon_scope_t
* oldscope
= ctx
-> decl
;
2656 ctx
-> decl
= modscope
;
2658 if(ctx
-> token
== LPAREN
)
2660 oberon_assert_token(ctx
, LPAREN
);
2662 oberon_object_t
* typeobj
;
2663 typeobj
= oberon_qualident(ctx
, NULL
, true);
2665 if(typeobj
-> class != OBERON_CLASS_TYPE
)
2667 oberon_error(ctx
, "base must be type");
2670 oberon_type_t
* base
= typeobj
-> type
;
2671 if(base
-> class == OBERON_TYPE_POINTER
)
2673 base
= base
-> base
;
2676 if(base
-> class != OBERON_TYPE_RECORD
)
2678 oberon_error(ctx
, "base must be record type");
2682 ctx
-> decl
= base
-> scope
;
2684 oberon_assert_token(ctx
, RPAREN
);
2691 oberon_scope_t
* this_scope
;
2692 this_scope
= oberon_open_scope(ctx
);
2693 this_scope
-> local
= true;
2694 this_scope
-> parent
= NULL
;
2695 this_scope
-> parent_type
= rec
;
2697 oberon_field_list(ctx
, rec
, modscope
);
2698 while(ctx
-> token
== SEMICOLON
)
2700 oberon_assert_token(ctx
, SEMICOLON
);
2701 oberon_field_list(ctx
, rec
, modscope
);
2704 rec
-> scope
= this_scope
;
2705 rec
-> decl
= this_scope
-> list
-> next
;
2706 ctx
-> decl
= oldscope
;
2710 oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
2712 if(ctx
-> token
== IDENT
)
2714 oberon_qualident_type(ctx
, type
);
2716 else if(ctx
-> token
== ARRAY
)
2718 oberon_assert_token(ctx
, ARRAY
);
2721 oberon_expr_t
* sizes
;
2723 if(ISEXPR(ctx
-> token
))
2725 oberon_expr_list(ctx
, &num_sizes
, &sizes
, 1);
2728 oberon_assert_token(ctx
, OF
);
2730 oberon_type_t
* base
;
2731 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2732 oberon_type(ctx
, &base
);
2736 oberon_make_open_array(ctx
, base
, *type
);
2740 oberon_make_multiarray(ctx
, sizes
, base
, type
);
2743 else if(ctx
-> token
== RECORD
)
2745 oberon_type_t
* rec
;
2747 rec
-> class = OBERON_TYPE_RECORD
;
2748 rec
-> module
= ctx
-> mod
;
2750 oberon_assert_token(ctx
, RECORD
);
2751 oberon_type_record_body(ctx
, rec
);
2752 oberon_assert_token(ctx
, END
);
2756 else if(ctx
-> token
== POINTER
)
2758 oberon_assert_token(ctx
, POINTER
);
2759 oberon_assert_token(ctx
, TO
);
2761 oberon_type_t
* base
;
2762 base
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2763 oberon_type(ctx
, &base
);
2765 oberon_type_t
* ptr
;
2767 ptr
-> class = OBERON_TYPE_POINTER
;
2770 else if(ctx
-> token
== PROCEDURE
)
2772 oberon_open_scope(ctx
);
2773 oberon_assert_token(ctx
, PROCEDURE
);
2774 oberon_opt_formal_pars(ctx
, type
);
2775 oberon_close_scope(ctx
-> decl
);
2779 oberon_error(ctx
, "invalid type declaration");
2784 oberon_type_decl(oberon_context_t
* ctx
)
2787 oberon_object_t
* newtype
;
2788 oberon_type_t
* type
;
2792 name
= oberon_assert_ident(ctx
);
2793 oberon_def(ctx
, &export
, &read_only
);
2795 newtype
= oberon_find_object(ctx
-> decl
, name
, 0);
2798 newtype
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
, export
, read_only
, false);
2799 newtype
-> type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
2800 assert(newtype
-> type
);
2804 if(newtype
-> class != OBERON_CLASS_TYPE
)
2806 oberon_error(ctx
, "mult definition");
2809 if(newtype
-> linked
)
2811 oberon_error(ctx
, "mult definition - already linked");
2814 newtype
-> export
= export
;
2815 newtype
-> read_only
= read_only
;
2818 oberon_assert_token(ctx
, EQUAL
);
2820 type
= newtype
-> type
;
2821 oberon_type(ctx
, &type
);
2823 if(type
-> class == OBERON_TYPE_VOID
)
2825 oberon_error(ctx
, "recursive alias declaration");
2828 newtype
-> type
= type
;
2829 newtype
-> linked
= 1;
2832 static void oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
2833 static void oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
2836 oberon_prevent_recursive_pointer(oberon_context_t
* ctx
, oberon_type_t
* type
)
2838 if(type
-> class != OBERON_TYPE_POINTER
2839 && type
-> class != OBERON_TYPE_ARRAY
)
2844 if(type
-> recursive
)
2846 oberon_error(ctx
, "recursive pointer declaration");
2849 if(type
-> class == OBERON_TYPE_POINTER
2850 && type
-> base
-> class == OBERON_TYPE_POINTER
)
2852 oberon_error(ctx
, "attempt to make pointer to pointer");
2855 type
-> recursive
= 1;
2857 oberon_prevent_recursive_pointer(ctx
, type
-> base
);
2859 type
-> recursive
= 0;
2863 oberon_prevent_recursive_record(oberon_context_t
* ctx
, oberon_type_t
* type
)
2865 if(type
-> class != OBERON_TYPE_RECORD
)
2870 if(type
-> recursive
)
2872 oberon_error(ctx
, "recursive record declaration");
2875 type
-> recursive
= 1;
2879 oberon_prevent_recursive_record(ctx
, type
-> base
);
2882 int num_fields
= type
-> num_decl
;
2883 oberon_object_t
* field
= type
-> decl
;
2884 for(int i
= 0; i
< num_fields
; i
++)
2886 oberon_prevent_recursive_object(ctx
, field
);
2887 field
= field
-> next
;
2890 type
-> recursive
= 0;
2893 oberon_prevent_recursive_procedure(oberon_context_t
* ctx
, oberon_type_t
* type
)
2895 if(type
-> class != OBERON_TYPE_PROCEDURE
)
2900 if(type
-> recursive
)
2902 oberon_error(ctx
, "recursive procedure declaration");
2905 type
-> recursive
= 1;
2907 int num_fields
= type
-> num_decl
;
2908 oberon_object_t
* field
= type
-> decl
;
2909 for(int i
= 0; i
< num_fields
; i
++)
2911 oberon_prevent_recursive_object(ctx
, field
);
2912 field
= field
-> next
;
2915 type
-> recursive
= 0;
2919 oberon_prevent_recursive_array(oberon_context_t
* ctx
, oberon_type_t
* type
)
2921 if(type
-> class != OBERON_TYPE_ARRAY
)
2926 if(type
-> recursive
)
2928 oberon_error(ctx
, "recursive array declaration");
2931 type
-> recursive
= 1;
2933 oberon_prevent_recursive_type(ctx
, type
-> base
);
2935 type
-> recursive
= 0;
2939 oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
2941 if(type
-> class == OBERON_TYPE_POINTER
)
2943 oberon_prevent_recursive_pointer(ctx
, type
);
2945 else if(type
-> class == OBERON_TYPE_RECORD
)
2947 oberon_prevent_recursive_record(ctx
, type
);
2949 else if(type
-> class == OBERON_TYPE_ARRAY
)
2951 oberon_prevent_recursive_array(ctx
, type
);
2953 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
2955 oberon_prevent_recursive_procedure(ctx
, type
);
2960 oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
2964 case OBERON_CLASS_VAR
:
2965 case OBERON_CLASS_TYPE
:
2966 case OBERON_CLASS_PARAM
:
2967 case OBERON_CLASS_VAR_PARAM
:
2968 case OBERON_CLASS_FIELD
:
2969 oberon_prevent_recursive_type(ctx
, x
-> type
);
2971 case OBERON_CLASS_CONST
:
2972 case OBERON_CLASS_PROC
:
2973 case OBERON_CLASS_MODULE
:
2976 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
2982 oberon_prevent_recursive_decl(oberon_context_t
* ctx
)
2984 oberon_object_t
* x
= ctx
-> decl
-> list
-> next
;
2988 oberon_prevent_recursive_object(ctx
, x
);
2993 static void oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
2994 static void oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
2997 oberon_initialize_record_fields(oberon_context_t
* ctx
, oberon_type_t
* type
)
2999 if(type
-> class != OBERON_TYPE_RECORD
)
3004 int num_fields
= type
-> num_decl
;
3005 oberon_object_t
* field
= type
-> decl
;
3006 for(int i
= 0; i
< num_fields
; i
++)
3008 if(field
-> type
-> class == OBERON_TYPE_POINTER
)
3010 oberon_initialize_type(ctx
, field
-> type
);
3013 oberon_initialize_object(ctx
, field
);
3014 field
= field
-> next
;
3017 oberon_generator_init_record(ctx
, type
);
3021 oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
3023 if(type
-> class == OBERON_TYPE_VOID
)
3025 oberon_error(ctx
, "undeclarated type");
3028 if(type
-> initialized
)
3033 type
-> initialized
= 1;
3035 if(type
-> class == OBERON_TYPE_POINTER
)
3037 oberon_initialize_type(ctx
, type
-> base
);
3038 oberon_generator_init_type(ctx
, type
);
3040 else if(type
-> class == OBERON_TYPE_ARRAY
)
3042 if(type
-> size
!= 0)
3044 if(type
-> base
-> class == OBERON_TYPE_ARRAY
)
3046 if(type
-> base
-> size
== 0)
3048 oberon_error(ctx
, "open array not allowed as array element");
3053 oberon_initialize_type(ctx
, type
-> base
);
3054 oberon_generator_init_type(ctx
, type
);
3056 else if(type
-> class == OBERON_TYPE_RECORD
)
3058 oberon_generator_init_type(ctx
, type
);
3059 oberon_initialize_record_fields(ctx
, type
);
3061 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
3063 int num_fields
= type
-> num_decl
;
3064 oberon_object_t
* field
= type
-> decl
;
3065 for(int i
= 0; i
< num_fields
; i
++)
3067 oberon_initialize_object(ctx
, field
);
3068 field
= field
-> next
;
3071 oberon_generator_init_type(ctx
, type
);
3075 oberon_generator_init_type(ctx
, type
);
3080 oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
3082 if(x
-> initialized
)
3087 x
-> initialized
= 1;
3091 case OBERON_CLASS_TYPE
:
3092 oberon_initialize_type(ctx
, x
-> type
);
3094 case OBERON_CLASS_VAR
:
3095 case OBERON_CLASS_FIELD
:
3096 if(x
-> type
-> class == OBERON_TYPE_ARRAY
)
3098 if(x
-> type
-> size
== 0)
3100 oberon_error(ctx
, "open array not allowed as variable or field");
3103 oberon_initialize_type(ctx
, x
-> type
);
3104 oberon_generator_init_var(ctx
, x
);
3106 case OBERON_CLASS_PARAM
:
3107 case OBERON_CLASS_VAR_PARAM
:
3108 oberon_initialize_type(ctx
, x
-> type
);
3109 oberon_generator_init_var(ctx
, x
);
3111 case OBERON_CLASS_CONST
:
3112 case OBERON_CLASS_PROC
:
3113 case OBERON_CLASS_MODULE
:
3116 oberon_error(ctx
, "oberon_initialize_object: wat");
3122 oberon_initialize_decl(oberon_context_t
* ctx
)
3124 oberon_object_t
* x
= ctx
-> decl
-> list
;
3128 oberon_initialize_object(ctx
, x
-> next
);
3134 oberon_prevent_undeclarated_procedures(oberon_context_t
* ctx
)
3136 oberon_object_t
* x
= ctx
-> decl
-> list
;
3140 if(x
-> next
-> class == OBERON_CLASS_PROC
)
3142 if(x
-> next
-> linked
== 0)
3144 oberon_error(ctx
, "unresolved forward declaration");
3152 oberon_decl_seq(oberon_context_t
* ctx
)
3154 if(ctx
-> token
== CONST
)
3156 oberon_assert_token(ctx
, CONST
);
3157 while(ctx
-> token
== IDENT
)
3159 oberon_const_decl(ctx
);
3160 oberon_assert_token(ctx
, SEMICOLON
);
3164 if(ctx
-> token
== TYPE
)
3166 oberon_assert_token(ctx
, TYPE
);
3167 while(ctx
-> token
== IDENT
)
3169 oberon_type_decl(ctx
);
3170 oberon_assert_token(ctx
, SEMICOLON
);
3174 if(ctx
-> token
== VAR
)
3176 oberon_assert_token(ctx
, VAR
);
3177 while(ctx
-> token
== IDENT
)
3179 oberon_var_decl(ctx
);
3180 oberon_assert_token(ctx
, SEMICOLON
);
3184 oberon_prevent_recursive_decl(ctx
);
3185 oberon_initialize_decl(ctx
);
3187 while(ctx
-> token
== PROCEDURE
)
3189 oberon_proc_decl(ctx
);
3190 oberon_assert_token(ctx
, SEMICOLON
);
3193 oberon_prevent_undeclarated_procedures(ctx
);
3196 static oberon_expr_t
*
3197 oberon_make_temp_var_item(oberon_context_t
* ctx
, oberon_type_t
* type
)
3199 oberon_object_t
* x
;
3200 oberon_expr_t
* expr
;
3202 x
= oberon_create_object(ctx
-> decl
, "TEMP", OBERON_CLASS_VAR
, false, false);
3205 oberon_generator_init_temp_var(ctx
, x
);
3207 expr
= oberon_new_item(MODE_VAR
, type
, false);
3208 expr
-> item
.var
= x
;
3213 oberon_statement_seq(oberon_context_t
* ctx
);
3216 oberon_assign(oberon_context_t
* ctx
, oberon_expr_t
* src
, oberon_expr_t
* dst
)
3218 if(dst
-> read_only
)
3220 oberon_error(ctx
, "read-only destination");
3223 oberon_check_dst(ctx
, dst
);
3224 src
= oberon_autocast_to(ctx
, src
, dst
-> result
);
3225 oberon_generate_assign(ctx
, src
, dst
);
3228 static oberon_expr_t
*
3229 oberon_case_labels(oberon_context_t
* ctx
, oberon_expr_t
* val
)
3233 oberon_expr_t
* cond
;
3234 oberon_expr_t
* cond2
;
3236 e1
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3237 oberon_autocast_to(ctx
, e1
, val
-> result
);
3240 if(ctx
-> token
== DOTDOT
)
3242 oberon_assert_token(ctx
, DOTDOT
);
3243 e2
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3244 oberon_autocast_to(ctx
, e2
, val
-> result
);
3250 cond
= oberon_make_bin_op(ctx
, EQUAL
, val
, e1
);
3254 /* val >= e1 && val <= e2 */
3255 cond
= oberon_make_bin_op(ctx
, GEQ
, val
, e1
);
3256 cond2
= oberon_make_bin_op(ctx
, LEQ
, val
, e2
);
3257 cond
= oberon_make_bin_op(ctx
, AND
, cond
, cond2
);
3264 oberon_case(oberon_context_t
* ctx
, oberon_expr_t
* val
, gen_label_t
* end
)
3266 oberon_expr_t
* cond
;
3267 oberon_expr_t
* cond2
;
3268 gen_label_t
* this_end
;
3270 if(ISEXPR(ctx
-> token
))
3272 this_end
= oberon_generator_reserve_label(ctx
);
3274 cond
= oberon_case_labels(ctx
, val
);
3275 while(ctx
-> token
== COMMA
)
3277 oberon_assert_token(ctx
, COMMA
);
3279 cond2
= oberon_case_labels(ctx
, val
);
3280 cond
= oberon_make_bin_op(ctx
, OR
, cond
, cond2
);
3282 oberon_assert_token(ctx
, COLON
);
3284 oberon_generate_branch(ctx
, cond
, false, this_end
);
3285 oberon_statement_seq(ctx
);
3286 oberon_generate_goto(ctx
, end
);
3288 oberon_generate_label(ctx
, this_end
);
3293 oberon_case_statement(oberon_context_t
* ctx
)
3295 oberon_expr_t
* val
;
3296 oberon_expr_t
* expr
;
3299 end
= oberon_generator_reserve_label(ctx
);
3301 oberon_assert_token(ctx
, CASE
);
3302 expr
= oberon_expr(ctx
);
3303 val
= oberon_make_temp_var_item(ctx
, expr
-> result
);
3304 oberon_assign(ctx
, expr
, val
);
3305 oberon_assert_token(ctx
, OF
);
3306 oberon_case(ctx
, val
, end
);
3307 while(ctx
-> token
== BAR
)
3309 oberon_assert_token(ctx
, BAR
);
3310 oberon_case(ctx
, val
, end
);
3313 if(ctx
-> token
== ELSE
)
3315 oberon_assert_token(ctx
, ELSE
);
3316 oberon_statement_seq(ctx
);
3319 oberon_generate_label(ctx
, end
);
3320 oberon_assert_token(ctx
, END
);
3324 oberon_with_guard_do(oberon_context_t
* ctx
, gen_label_t
* end
)
3326 oberon_expr_t
* val
;
3327 oberon_expr_t
* var
;
3328 oberon_expr_t
* type
;
3329 oberon_expr_t
* cond
;
3330 oberon_expr_t
* cast
;
3331 oberon_type_t
* old_type
;
3332 gen_var_t
* old_var
;
3333 gen_label_t
* this_end
;
3335 this_end
= oberon_generator_reserve_label(ctx
);
3337 var
= oberon_qualident_expr(ctx
);
3338 oberon_assert_token(ctx
, COLON
);
3339 type
= oberon_qualident_expr(ctx
);
3340 cond
= oberon_make_bin_op(ctx
, IS
, var
, type
);
3342 oberon_assert_token(ctx
, DO
);
3343 oberon_generate_branch(ctx
, cond
, false, this_end
);
3345 /* Сохраняем ссылку во временной переменной */
3346 val
= oberon_make_temp_var_item(ctx
, type
-> result
);
3347 cast
= oberno_make_record_cast(ctx
, var
, type
-> result
);
3348 oberon_assign(ctx
, cast
, val
);
3349 /* Подменяем тип у оригинальной переменной */
3350 old_type
= var
-> item
.var
-> type
;
3351 var
-> item
.var
-> type
= type
-> result
;
3352 /* Подменяем ссылку на переменную */
3353 old_var
= var
-> item
.var
-> gen_var
;
3354 var
-> item
.var
-> gen_var
= val
-> item
.var
-> gen_var
;
3356 oberon_statement_seq(ctx
);
3357 oberon_generate_goto(ctx
, end
);
3358 oberon_generate_label(ctx
, this_end
);
3360 /* Возвращаем исходное состояние */
3361 var
-> item
.var
-> gen_var
= old_var
;
3362 var
-> item
.var
-> type
= old_type
;
3366 oberon_with_statement(oberon_context_t
* ctx
)
3369 end
= oberon_generator_reserve_label(ctx
);
3371 oberon_assert_token(ctx
, WITH
);
3372 oberon_with_guard_do(ctx
, end
);
3373 while(ctx
-> token
== BAR
)
3375 oberon_assert_token(ctx
, BAR
);
3376 oberon_with_guard_do(ctx
, end
);
3379 if(ctx
-> token
== ELSE
)
3381 oberon_assert_token(ctx
, ELSE
);
3382 oberon_statement_seq(ctx
);
3385 oberon_generate_label(ctx
, end
);
3386 oberon_assert_token(ctx
, END
);
3390 oberon_statement(oberon_context_t
* ctx
)
3392 oberon_expr_t
* item1
;
3393 oberon_expr_t
* item2
;
3395 if(ctx
-> token
== IDENT
)
3397 item1
= oberon_designator(ctx
);
3398 if(ctx
-> token
== ASSIGN
)
3400 oberon_assert_token(ctx
, ASSIGN
);
3401 item2
= oberon_expr(ctx
);
3402 oberon_assign(ctx
, item2
, item1
);
3406 oberon_opt_proc_parens(ctx
, item1
);
3409 else if(ctx
-> token
== IF
)
3413 oberon_expr_t
* cond
;
3415 els
= oberon_generator_reserve_label(ctx
);
3416 end
= oberon_generator_reserve_label(ctx
);
3418 oberon_assert_token(ctx
, IF
);
3419 cond
= oberon_expr(ctx
);
3420 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3422 oberon_error(ctx
, "condition must be boolean");
3424 oberon_assert_token(ctx
, THEN
);
3425 oberon_generate_branch(ctx
, cond
, false, els
);
3426 oberon_statement_seq(ctx
);
3427 oberon_generate_goto(ctx
, end
);
3428 oberon_generate_label(ctx
, els
);
3430 while(ctx
-> token
== ELSIF
)
3432 els
= oberon_generator_reserve_label(ctx
);
3434 oberon_assert_token(ctx
, ELSIF
);
3435 cond
= oberon_expr(ctx
);
3436 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3438 oberon_error(ctx
, "condition must be boolean");
3440 oberon_assert_token(ctx
, THEN
);
3441 oberon_generate_branch(ctx
, cond
, false, els
);
3442 oberon_statement_seq(ctx
);
3443 oberon_generate_goto(ctx
, end
);
3444 oberon_generate_label(ctx
, els
);
3447 if(ctx
-> token
== ELSE
)
3449 oberon_assert_token(ctx
, ELSE
);
3450 oberon_statement_seq(ctx
);
3453 oberon_generate_label(ctx
, end
);
3454 oberon_assert_token(ctx
, END
);
3456 else if(ctx
-> token
== WHILE
)
3458 gen_label_t
* begin
;
3460 oberon_expr_t
* cond
;
3462 begin
= oberon_generator_reserve_label(ctx
);
3463 end
= oberon_generator_reserve_label(ctx
);
3465 oberon_assert_token(ctx
, WHILE
);
3466 oberon_generate_label(ctx
, begin
);
3467 cond
= oberon_expr(ctx
);
3468 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3470 oberon_error(ctx
, "condition must be boolean");
3472 oberon_generate_branch(ctx
, cond
, false, end
);
3474 oberon_assert_token(ctx
, DO
);
3475 oberon_statement_seq(ctx
);
3476 oberon_generate_goto(ctx
, begin
);
3478 oberon_assert_token(ctx
, END
);
3479 oberon_generate_label(ctx
, end
);
3481 else if(ctx
-> token
== REPEAT
)
3483 gen_label_t
* begin
;
3484 oberon_expr_t
* cond
;
3486 begin
= oberon_generator_reserve_label(ctx
);
3487 oberon_generate_label(ctx
, begin
);
3488 oberon_assert_token(ctx
, REPEAT
);
3490 oberon_statement_seq(ctx
);
3492 oberon_assert_token(ctx
, UNTIL
);
3494 cond
= oberon_expr(ctx
);
3495 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3497 oberon_error(ctx
, "condition must be boolean");
3500 oberon_generate_branch(ctx
, cond
, true, begin
);
3502 else if(ctx
-> token
== FOR
)
3504 oberon_expr_t
* from
;
3505 oberon_expr_t
* index
;
3507 oberon_expr_t
* bound
;
3509 oberon_expr_t
* cond
;
3510 oberon_expr_t
* count
;
3511 gen_label_t
* begin
;
3516 begin
= oberon_generator_reserve_label(ctx
);
3517 end
= oberon_generator_reserve_label(ctx
);
3519 oberon_assert_token(ctx
, FOR
);
3520 iname
= oberon_assert_ident(ctx
);
3521 index
= oberon_ident_item(ctx
, iname
);
3522 oberon_assert_token(ctx
, ASSIGN
);
3523 from
= oberon_expr(ctx
);
3524 oberon_assign(ctx
, from
, index
);
3525 oberon_assert_token(ctx
, TO
);
3526 bound
= oberon_make_temp_var_item(ctx
, index
-> result
);
3527 to
= oberon_expr(ctx
);
3528 oberon_assign(ctx
, to
, bound
);
3529 if(ctx
-> token
== BY
)
3531 oberon_assert_token(ctx
, BY
);
3532 by
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3536 by
= oberon_integer_item(ctx
, 1);
3539 if(by
-> result
-> class != OBERON_TYPE_INTEGER
)
3541 oberon_error(ctx
, "must be integer");
3544 if(by
-> item
.integer
> 0)
3548 else if(by
-> item
.integer
< 0)
3554 oberon_error(ctx
, "zero step not allowed");
3557 oberon_assert_token(ctx
, DO
);
3558 oberon_generate_label(ctx
, begin
);
3559 cond
= oberon_make_bin_op(ctx
, op
, index
, bound
);
3560 oberon_generate_branch(ctx
, cond
, false, end
);
3561 oberon_statement_seq(ctx
);
3562 count
= oberon_make_bin_op(ctx
, PLUS
, index
, by
);
3563 oberon_assign(ctx
, count
, index
);
3564 oberon_generate_goto(ctx
, begin
);
3565 oberon_generate_label(ctx
, end
);
3566 oberon_assert_token(ctx
, END
);
3568 else if(ctx
-> token
== LOOP
)
3570 gen_label_t
* begin
;
3573 begin
= oberon_generator_reserve_label(ctx
);
3574 end
= oberon_generator_reserve_label(ctx
);
3576 oberon_open_scope(ctx
);
3577 oberon_assert_token(ctx
, LOOP
);
3578 oberon_generate_label(ctx
, begin
);
3579 ctx
-> decl
-> exit_label
= end
;
3580 oberon_statement_seq(ctx
);
3581 oberon_generate_goto(ctx
, begin
);
3582 oberon_generate_label(ctx
, end
);
3583 oberon_assert_token(ctx
, END
);
3584 oberon_close_scope(ctx
-> decl
);
3586 else if(ctx
-> token
== EXIT
)
3588 oberon_assert_token(ctx
, EXIT
);
3589 if(ctx
-> decl
-> exit_label
== NULL
)
3591 oberon_error(ctx
, "not in LOOP-END");
3593 oberon_generate_goto(ctx
, ctx
-> decl
-> exit_label
);
3595 else if(ctx
-> token
== CASE
)
3597 oberon_case_statement(ctx
);
3599 else if(ctx
-> token
== WITH
)
3601 oberon_with_statement(ctx
);
3603 else if(ctx
-> token
== RETURN
)
3605 oberon_assert_token(ctx
, RETURN
);
3606 if(ISEXPR(ctx
-> token
))
3608 oberon_expr_t
* expr
;
3609 expr
= oberon_expr(ctx
);
3610 oberon_make_return(ctx
, expr
);
3614 oberon_make_return(ctx
, NULL
);
3620 oberon_statement_seq(oberon_context_t
* ctx
)
3622 oberon_statement(ctx
);
3623 while(ctx
-> token
== SEMICOLON
)
3625 oberon_assert_token(ctx
, SEMICOLON
);
3626 oberon_statement(ctx
);
3631 oberon_import_module(oberon_context_t
* ctx
, char * alias
, char * name
)
3633 oberon_module_t
* m
= ctx
-> module_list
;
3634 while(m
&& strcmp(m
-> name
, name
) != 0)
3642 code
= ctx
-> import_module(name
);
3645 oberon_error(ctx
, "no such module");
3648 m
= oberon_compile_module(ctx
, code
);
3654 oberon_error(ctx
, "cyclic module import");
3657 oberon_object_t
* ident
;
3658 ident
= oberon_define_object(ctx
-> decl
, alias
, OBERON_CLASS_MODULE
, false, false, false);
3659 ident
-> module
= m
;
3663 oberon_import_decl(oberon_context_t
* ctx
)
3668 alias
= name
= oberon_assert_ident(ctx
);
3669 if(ctx
-> token
== ASSIGN
)
3671 oberon_assert_token(ctx
, ASSIGN
);
3672 name
= oberon_assert_ident(ctx
);
3675 oberon_import_module(ctx
, alias
, name
);
3679 oberon_import_list(oberon_context_t
* ctx
)
3681 oberon_assert_token(ctx
, IMPORT
);
3683 oberon_import_decl(ctx
);
3684 while(ctx
-> token
== COMMA
)
3686 oberon_assert_token(ctx
, COMMA
);
3687 oberon_import_decl(ctx
);
3690 oberon_assert_token(ctx
, SEMICOLON
);
3694 oberon_parse_module(oberon_context_t
* ctx
)
3698 oberon_read_token(ctx
);
3700 oberon_assert_token(ctx
, MODULE
);
3701 name1
= oberon_assert_ident(ctx
);
3702 oberon_assert_token(ctx
, SEMICOLON
);
3703 ctx
-> mod
-> name
= name1
;
3705 oberon_generator_init_module(ctx
, ctx
-> mod
);
3707 if(ctx
-> token
== IMPORT
)
3709 oberon_import_list(ctx
);
3712 oberon_decl_seq(ctx
);
3714 oberon_generate_begin_module(ctx
);
3715 if(ctx
-> token
== BEGIN
)
3717 oberon_assert_token(ctx
, BEGIN
);
3718 oberon_statement_seq(ctx
);
3720 oberon_generate_end_module(ctx
);
3722 oberon_assert_token(ctx
, END
);
3723 name2
= oberon_assert_ident(ctx
);
3724 oberon_expect_token(ctx
, DOT
);
3726 if(strcmp(name1
, name2
) != 0)
3728 oberon_error(ctx
, "module name not matched");
3731 oberon_generator_fini_module(ctx
-> mod
);
3734 // =======================================================================
3736 // =======================================================================
3739 register_default_types(oberon_context_t
* ctx
)
3741 ctx
-> void_type
= oberon_new_type_ptr(OBERON_TYPE_VOID
);
3742 oberon_generator_init_type(ctx
, ctx
-> void_type
);
3744 ctx
-> void_ptr_type
= oberon_new_type_ptr(OBERON_TYPE_POINTER
);
3745 ctx
-> void_ptr_type
-> base
= ctx
-> void_type
;
3746 oberon_generator_init_type(ctx
, ctx
-> void_ptr_type
);
3748 ctx
-> string_type
= oberon_new_type_string(1);
3749 oberon_generator_init_type(ctx
, ctx
-> string_type
);
3751 ctx
-> bool_type
= oberon_new_type_boolean();
3752 oberon_define_type(ctx
-> world_scope
, "BOOLEAN", ctx
-> bool_type
, 1);
3754 ctx
-> byte_type
= oberon_new_type_integer(1);
3755 oberon_define_type(ctx
-> world_scope
, "BYTE", ctx
-> byte_type
, 1);
3757 ctx
-> shortint_type
= oberon_new_type_integer(2);
3758 oberon_define_type(ctx
-> world_scope
, "SHORTINT", ctx
-> shortint_type
, 1);
3760 ctx
-> int_type
= oberon_new_type_integer(4);
3761 oberon_define_type(ctx
-> world_scope
, "INTEGER", ctx
-> int_type
, 1);
3763 ctx
-> longint_type
= oberon_new_type_integer(8);
3764 oberon_define_type(ctx
-> world_scope
, "LONGINT", ctx
-> longint_type
, 1);
3766 ctx
-> real_type
= oberon_new_type_real(4);
3767 oberon_define_type(ctx
-> world_scope
, "REAL", ctx
-> real_type
, 1);
3769 ctx
-> longreal_type
= oberon_new_type_real(8);
3770 oberon_define_type(ctx
-> world_scope
, "LONGREAL", ctx
-> longreal_type
, 1);
3772 ctx
-> char_type
= oberon_new_type_char(1);
3773 oberon_define_type(ctx
-> world_scope
, "CHAR", ctx
-> char_type
, 1);
3775 ctx
-> set_type
= oberon_new_type_set(4);
3776 oberon_define_type(ctx
-> world_scope
, "SET", ctx
-> set_type
, 1);
3780 oberon_new_intrinsic(oberon_context_t
* ctx
, char * name
, GenerateFuncCallback f
, GenerateProcCallback p
)
3782 oberon_object_t
* proc
;
3783 proc
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_PROC
, true, false, false);
3784 proc
-> type
= oberon_new_type_ptr(OBERON_TYPE_PROCEDURE
);
3785 proc
-> type
-> sysproc
= true;
3786 proc
-> type
-> genfunc
= f
;
3787 proc
-> type
-> genproc
= p
;
3790 static oberon_expr_t
*
3791 oberon_make_min_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3795 oberon_error(ctx
, "too few arguments");
3800 oberon_error(ctx
, "too mach arguments");
3803 oberon_expr_t
* arg
;
3806 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3808 oberon_error(ctx
, "MIN accept only type");
3811 oberon_expr_t
* expr
;
3812 int bits
= arg
-> result
-> size
* 8;
3813 switch(arg
-> result
-> class)
3815 case OBERON_TYPE_INTEGER
:
3816 expr
= oberon_integer_item(ctx
, -powl(2, bits
- 1));
3818 case OBERON_TYPE_SET
:
3819 expr
= oberon_integer_item(ctx
, 0);
3822 oberon_error(ctx
, "allowed only basic types");
3829 static oberon_expr_t
*
3830 oberon_make_max_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3834 oberon_error(ctx
, "too few arguments");
3839 oberon_error(ctx
, "too mach arguments");
3842 oberon_expr_t
* arg
;
3845 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3847 oberon_error(ctx
, "MAX accept only type");
3850 oberon_expr_t
* expr
;
3851 int bits
= arg
-> result
-> size
* 8;
3852 switch(arg
-> result
-> class)
3854 case OBERON_TYPE_INTEGER
:
3855 expr
= oberon_integer_item(ctx
, powl(2, bits
- 1) - 1);
3857 case OBERON_TYPE_SET
:
3858 expr
= oberon_integer_item(ctx
, bits
);
3861 oberon_error(ctx
, "allowed only basic types");
3868 static oberon_expr_t
*
3869 oberon_make_size_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3873 oberon_error(ctx
, "too few arguments");
3878 oberon_error(ctx
, "too mach arguments");
3881 oberon_expr_t
* arg
;
3884 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3886 oberon_error(ctx
, "SIZE accept only type");
3890 oberon_expr_t
* expr
;
3891 oberon_type_t
* type
= arg
-> result
;
3892 switch(type
-> class)
3894 case OBERON_TYPE_INTEGER
:
3895 case OBERON_TYPE_BOOLEAN
:
3896 case OBERON_TYPE_REAL
:
3897 case OBERON_TYPE_CHAR
:
3898 case OBERON_TYPE_SET
:
3899 size
= type
-> size
;
3902 oberon_error(ctx
, "TODO SIZE");
3906 expr
= oberon_integer_item(ctx
, size
);
3910 static oberon_expr_t
*
3911 oberon_make_abs_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3915 oberon_error(ctx
, "too few arguments");
3920 oberon_error(ctx
, "too mach arguments");
3923 oberon_expr_t
* arg
;
3925 oberon_check_src(ctx
, arg
);
3927 oberon_type_t
* result_type
;
3928 result_type
= arg
-> result
;
3930 if(result_type
-> class != OBERON_TYPE_INTEGER
)
3932 oberon_error(ctx
, "ABS accepts only integers");
3935 oberon_expr_t
* expr
;
3936 expr
= oberon_new_operator(OP_ABS
, result_type
, arg
, NULL
);
3941 oberon_make_new_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3945 oberon_error(ctx
, "too few arguments");
3949 oberon_expr_t
* dst
;
3951 oberon_check_dst(ctx
, dst
);
3953 oberon_type_t
* type
;
3954 type
= dst
-> result
;
3956 if(type
-> class != OBERON_TYPE_POINTER
)
3958 oberon_error(ctx
, "not a pointer");
3961 type
= type
-> base
;
3963 oberon_expr_t
* src
;
3964 src
= oberon_new_item(MODE_NEW
, dst
-> result
, 0);
3965 src
-> item
.num_args
= 0;
3966 src
-> item
.args
= NULL
;
3969 if(type
-> class == OBERON_TYPE_ARRAY
)
3971 if(type
-> size
== 0)
3973 oberon_type_t
* x
= type
;
3974 while(x
-> class == OBERON_TYPE_ARRAY
)
3984 if(num_args
< max_args
)
3986 oberon_error(ctx
, "too few arguments");
3989 if(num_args
> max_args
)
3991 oberon_error(ctx
, "too mach arguments");
3994 int num_sizes
= max_args
- 1;
3995 oberon_expr_t
* size_list
= list_args
-> next
;
3997 oberon_expr_t
* arg
= size_list
;
3998 for(int i
= 0; i
< max_args
- 1; i
++)
4000 oberon_check_src(ctx
, arg
);
4001 if(arg
-> result
-> class != OBERON_TYPE_INTEGER
)
4003 oberon_error(ctx
, "size must be integer");
4008 src
-> item
.num_args
= num_sizes
;
4009 src
-> item
.args
= size_list
;
4011 else if(type
-> class != OBERON_TYPE_RECORD
)
4013 oberon_error(ctx
, "oberon_make_new_call: wat");
4016 if(num_args
> max_args
)
4018 oberon_error(ctx
, "too mach arguments");
4021 oberon_assign(ctx
, src
, dst
);
4025 oberon_new_const(oberon_context_t
* ctx
, char * name
, oberon_expr_t
* expr
)
4027 oberon_object_t
* constant
;
4028 constant
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_CONST
, true, false, false);
4029 oberon_check_const(ctx
, expr
);
4030 constant
-> value
= (oberon_item_t
*) expr
;
4034 oberon_create_context(ModuleImportCallback import_module
)
4036 oberon_context_t
* ctx
= calloc(1, sizeof *ctx
);
4038 oberon_scope_t
* world_scope
;
4039 world_scope
= oberon_open_scope(ctx
);
4040 ctx
-> world_scope
= world_scope
;
4042 ctx
-> import_module
= import_module
;
4044 oberon_generator_init_context(ctx
);
4046 register_default_types(ctx
);
4049 oberon_new_const(ctx
, "TRUE", oberon_make_boolean(ctx
, true));
4050 oberon_new_const(ctx
, "FALSE", oberon_make_boolean(ctx
, false));
4053 oberon_new_intrinsic(ctx
, "ABS", oberon_make_abs_call
, NULL
);
4054 oberon_new_intrinsic(ctx
, "MIN", oberon_make_min_call
, NULL
);
4055 oberon_new_intrinsic(ctx
, "MAX", oberon_make_max_call
, NULL
);
4056 oberon_new_intrinsic(ctx
, "SIZE", oberon_make_size_call
, NULL
);
4059 oberon_new_intrinsic(ctx
, "NEW", NULL
, oberon_make_new_call
);
4065 oberon_destroy_context(oberon_context_t
* ctx
)
4067 oberon_generator_destroy_context(ctx
);
4072 oberon_compile_module(oberon_context_t
* ctx
, const char * newcode
)
4074 const char * code
= ctx
-> code
;
4075 int code_index
= ctx
-> code_index
;
4077 int token
= ctx
-> token
;
4078 char * string
= ctx
-> string
;
4079 int integer
= ctx
-> integer
;
4080 int real
= ctx
-> real
;
4081 bool longmode
= ctx
-> longmode
;
4082 oberon_scope_t
* decl
= ctx
-> decl
;
4083 oberon_module_t
* mod
= ctx
-> mod
;
4085 oberon_scope_t
* module_scope
;
4086 module_scope
= oberon_open_scope(ctx
);
4088 oberon_module_t
* module
;
4089 module
= calloc(1, sizeof *module
);
4090 module
-> decl
= module_scope
;
4091 module
-> next
= ctx
-> module_list
;
4093 ctx
-> mod
= module
;
4094 ctx
-> module_list
= module
;
4096 oberon_init_scaner(ctx
, newcode
);
4097 oberon_parse_module(ctx
);
4099 module
-> ready
= 1;
4102 ctx
-> code_index
= code_index
;
4104 ctx
-> token
= token
;
4105 ctx
-> string
= string
;
4106 ctx
-> integer
= integer
;
4108 ctx
-> longmode
= longmode
;