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 // Если STRING переводится в CHAR
1098 // Если STRING переводится в ARRAY OF CHAR
1099 // Если NIL переводится в POINTER
1100 // Если NIL переводится в PROCEDURE
1102 oberon_check_src(ctx
, expr
);
1105 if(pref
-> class != expr
-> result
-> class)
1107 if(expr
-> result
-> class == OBERON_TYPE_NIL
)
1109 if(pref
-> class != OBERON_TYPE_POINTER
1110 && pref
-> class != OBERON_TYPE_PROCEDURE
)
1115 else if(expr
-> result
-> class == OBERON_TYPE_STRING
)
1117 if(pref
-> class == OBERON_TYPE_CHAR
)
1119 if(expr
-> is_item
&& expr
-> item
.mode
== MODE_STRING
)
1121 if(strlen(expr
-> item
.string
) != 1)
1131 else if(pref
-> class == OBERON_TYPE_ARRAY
)
1133 if(pref
-> base
-> class != OBERON_TYPE_CHAR
)
1143 else if(expr
-> result
-> class == OBERON_TYPE_INTEGER
)
1145 if(pref
-> class != OBERON_TYPE_REAL
)
1158 oberon_error(ctx
, "oberon_autocast_to: incompatible types");
1161 if(pref
-> class == OBERON_TYPE_CHAR
)
1163 if(expr
-> result
-> class == OBERON_TYPE_STRING
)
1165 int c
= expr
-> item
.string
[0];
1166 expr
= oberon_new_item(MODE_CHAR
, ctx
-> char_type
, true);
1167 expr
-> item
.integer
= c
;
1170 else if(pref
-> class == OBERON_TYPE_INTEGER
|| pref
-> class == OBERON_TYPE_REAL
)
1172 if(expr
-> result
-> size
> pref
-> size
)
1174 oberon_error(ctx
, "incompatible size");
1178 expr
= oberon_cast_expr(ctx
, expr
, pref
);
1181 else if(pref
-> class == OBERON_TYPE_RECORD
)
1183 oberon_check_record_compatibility(ctx
, expr
-> result
, pref
);
1184 expr
= oberno_make_record_cast(ctx
, expr
, pref
);
1186 else if(pref
-> class == OBERON_TYPE_POINTER
)
1188 assert(pref
-> base
);
1189 if(expr
-> result
-> class == OBERON_TYPE_NIL
)
1193 else if(expr
-> result
-> base
-> class == OBERON_TYPE_RECORD
)
1195 oberon_check_record_compatibility(ctx
, expr
-> result
, pref
);
1196 expr
= oberno_make_record_cast(ctx
, expr
, pref
);
1198 else if(expr
-> result
-> base
!= pref
-> base
)
1200 oberon_error(ctx
, "incompatible pointer types");
1208 oberon_autocast_binary_op(oberon_context_t
* ctx
, oberon_expr_t
** ea
, oberon_expr_t
** eb
)
1210 oberon_type_t
* a
= (*ea
) -> result
;
1211 oberon_type_t
* b
= (*eb
) -> result
;
1212 oberon_type_t
* preq
= oberon_get_equal_expr_type(ctx
, a
, b
);
1213 *ea
= oberon_autocast_to(ctx
, *ea
, preq
);
1214 *eb
= oberon_autocast_to(ctx
, *eb
, preq
);
1218 oberon_autocast_call(oberon_context_t
* ctx
, oberon_item_t
* desig
)
1220 if(desig
-> mode
!= MODE_CALL
)
1222 oberon_error(ctx
, "expected mode CALL");
1225 oberon_type_t
* fn
= desig
-> parent
-> result
;
1226 int num_args
= desig
-> num_args
;
1227 int num_decl
= fn
-> num_decl
;
1229 if(num_args
< num_decl
)
1231 oberon_error(ctx
, "too few arguments");
1233 else if(num_args
> num_decl
)
1235 oberon_error(ctx
, "too many arguments");
1238 /* Делаем проверку на запись и делаем автокаст */
1239 oberon_expr_t
* casted
[num_args
];
1240 oberon_expr_t
* arg
= desig
-> args
;
1241 oberon_object_t
* param
= fn
-> decl
;
1242 for(int i
= 0; i
< num_args
; i
++)
1244 if(param
-> class == OBERON_CLASS_VAR_PARAM
)
1246 if(arg
-> result
!= param
-> type
)
1248 oberon_error(ctx
, "incompatible type");
1250 if(arg
-> read_only
)
1252 oberon_error(ctx
, "assign to read-only var");
1258 casted
[i
] = oberon_autocast_to(ctx
, arg
, param
-> type
);
1262 param
= param
-> next
;
1265 /* Создаём новый список выражений */
1269 for(int i
= 0; i
< num_args
- 1; i
++)
1271 casted
[i
] -> next
= casted
[i
+ 1];
1273 desig
-> args
= arg
;
1277 static oberon_expr_t
*
1278 oberon_make_call_func(oberon_context_t
* ctx
, oberon_item_t
* item
, int num_args
, oberon_expr_t
* list_args
)
1280 oberon_type_t
* signature
= item
-> result
;
1281 if(signature
-> class != OBERON_TYPE_PROCEDURE
)
1283 oberon_error(ctx
, "not a procedure");
1286 oberon_expr_t
* call
;
1288 if(signature
-> sysproc
)
1290 if(signature
-> genfunc
== NULL
)
1292 oberon_error(ctx
, "not a function-procedure");
1295 call
= signature
-> genfunc(ctx
, num_args
, list_args
);
1299 if(signature
-> base
-> class == OBERON_TYPE_NOTYPE
)
1301 oberon_error(ctx
, "attempt to call procedure in expression");
1304 call
= oberon_new_item(MODE_CALL
, signature
-> base
, true);
1305 call
-> item
.parent
= item
;
1306 call
-> item
.num_args
= num_args
;
1307 call
-> item
.args
= list_args
;
1308 oberon_autocast_call(ctx
, (oberon_item_t
*) call
);
1315 oberon_make_call_proc(oberon_context_t
* ctx
, oberon_item_t
* item
, int num_args
, oberon_expr_t
* list_args
)
1317 oberon_type_t
* signature
= item
-> result
;
1318 if(signature
-> class != OBERON_TYPE_PROCEDURE
)
1320 oberon_error(ctx
, "not a procedure");
1323 oberon_expr_t
* call
;
1325 if(signature
-> sysproc
)
1327 if(signature
-> genproc
== NULL
)
1329 oberon_error(ctx
, "not a procedure");
1332 signature
-> genproc(ctx
, num_args
, list_args
);
1336 if(signature
-> base
-> class != OBERON_TYPE_NOTYPE
)
1338 oberon_error(ctx
, "attempt to call function as non-typed procedure");
1341 call
= oberon_new_item(MODE_CALL
, signature
-> base
, true);
1342 call
-> item
.parent
= item
;
1343 call
-> item
.num_args
= num_args
;
1344 call
-> item
.args
= list_args
;
1345 oberon_autocast_call(ctx
, (oberon_item_t
*) call
);
1346 oberon_generate_call_proc(ctx
, call
);
1354 || ((x) == INTEGER) \
1357 || ((x) == STRING) \
1359 || ((x) == LPAREN) \
1362 static oberon_expr_t
*
1363 oberno_make_dereferencing(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1365 if(expr
-> result
-> class != OBERON_TYPE_POINTER
)
1367 oberon_error(ctx
, "not a pointer");
1370 assert(expr
-> is_item
);
1372 oberon_expr_t
* selector
;
1373 selector
= oberon_new_item(MODE_DEREF
, expr
-> result
-> base
, expr
-> read_only
);
1374 selector
-> item
.parent
= (oberon_item_t
*) expr
;
1379 static oberon_expr_t
*
1380 oberon_make_array_selector(oberon_context_t
* ctx
, oberon_expr_t
* desig
, oberon_expr_t
* index
)
1382 if(desig
-> result
-> class == OBERON_TYPE_POINTER
)
1384 desig
= oberno_make_dereferencing(ctx
, desig
);
1387 assert(desig
-> is_item
);
1389 if(desig
-> result
-> class != OBERON_TYPE_ARRAY
)
1391 oberon_error(ctx
, "not array");
1394 oberon_type_t
* base
;
1395 base
= desig
-> result
-> base
;
1397 if(index
-> result
-> class != OBERON_TYPE_INTEGER
)
1399 oberon_error(ctx
, "index must be integer");
1402 // Статическая проверка границ массива
1403 if(desig
-> result
-> size
!= 0)
1405 if(index
-> is_item
)
1407 if(index
-> item
.mode
== MODE_INTEGER
)
1409 int arr_size
= desig
-> result
-> size
;
1410 int index_int
= index
-> item
.integer
;
1411 if(index_int
< 0 || index_int
> arr_size
- 1)
1413 oberon_error(ctx
, "not in range (dimension size 0..%i)", arr_size
- 1);
1419 oberon_expr_t
* selector
;
1420 selector
= oberon_new_item(MODE_INDEX
, base
, desig
-> read_only
);
1421 selector
-> item
.parent
= (oberon_item_t
*) desig
;
1422 selector
-> item
.num_args
= 1;
1423 selector
-> item
.args
= index
;
1428 static oberon_expr_t
*
1429 oberon_make_record_selector(oberon_context_t
* ctx
, oberon_expr_t
* expr
, char * name
)
1431 if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
1433 expr
= oberno_make_dereferencing(ctx
, expr
);
1436 assert(expr
-> is_item
);
1438 if(expr
-> result
-> class != OBERON_TYPE_RECORD
)
1440 oberon_error(ctx
, "not record");
1443 oberon_type_t
* rec
= expr
-> result
;
1445 oberon_object_t
* field
;
1446 field
= oberon_find_object(rec
-> scope
, name
, true);
1448 if(field
-> export
== 0)
1450 if(field
-> module
!= ctx
-> mod
)
1452 oberon_error(ctx
, "field not exported");
1456 int read_only
= expr
-> read_only
;
1457 if(field
-> read_only
)
1459 if(field
-> module
!= ctx
-> mod
)
1465 oberon_expr_t
* selector
;
1466 selector
= oberon_new_item(MODE_FIELD
, field
-> type
, read_only
);
1467 selector
-> item
.var
= field
;
1468 selector
-> item
.parent
= (oberon_item_t
*) expr
;
1473 #define ISSELECTOR(x) \
1476 || ((x) == UPARROW) \
1479 static oberon_object_t
*
1480 oberon_qualident(oberon_context_t
* ctx
, char ** xname
, int check
)
1483 oberon_object_t
* x
;
1485 name
= oberon_assert_ident(ctx
);
1486 x
= oberon_find_object(ctx
-> decl
, name
, check
);
1490 if(x
-> class == OBERON_CLASS_MODULE
)
1492 oberon_assert_token(ctx
, DOT
);
1493 name
= oberon_assert_ident(ctx
);
1494 /* Наличие объектов в левых модулях всегда проверяется */
1495 x
= oberon_find_object(x
-> module
-> decl
, name
, 1);
1497 if(x
-> export
== 0)
1499 oberon_error(ctx
, "not exported");
1512 static oberon_expr_t
*
1513 oberon_ident_item(oberon_context_t
* ctx
, char * name
)
1516 oberon_object_t
* x
;
1517 oberon_expr_t
* expr
;
1519 x
= oberon_find_object(ctx
-> decl
, name
, true);
1522 if(x
-> class == OBERON_CLASS_CONST
|| x
-> class == OBERON_CLASS_PROC
)
1527 expr
= oberon_new_item(MODE_VAR
, x
-> type
, read_only
);
1528 expr
-> item
.var
= x
;
1532 static oberon_expr_t
*
1533 oberon_qualident_expr(oberon_context_t
* ctx
)
1535 oberon_object_t
* var
;
1536 oberon_expr_t
* expr
;
1538 var
= oberon_qualident(ctx
, NULL
, 1);
1541 if(var
-> read_only
)
1543 if(var
-> module
!= ctx
-> mod
)
1549 switch(var
-> class)
1551 case OBERON_CLASS_CONST
:
1553 expr
= (oberon_expr_t
*) var
-> value
;
1555 case OBERON_CLASS_TYPE
:
1556 expr
= oberon_new_item(MODE_TYPE
, var
-> type
, read_only
);
1558 case OBERON_CLASS_VAR
:
1559 case OBERON_CLASS_VAR_PARAM
:
1560 case OBERON_CLASS_PARAM
:
1561 expr
= oberon_new_item(MODE_VAR
, var
-> type
, read_only
);
1563 case OBERON_CLASS_PROC
:
1564 expr
= oberon_new_item(MODE_VAR
, var
-> type
, true);
1567 oberon_error(ctx
, "invalid designator");
1571 expr
-> item
.var
= var
;
1576 static oberon_expr_t
*
1577 oberon_make_type_guard(oberon_context_t
* ctx
, oberon_expr_t
* expr
, oberon_object_t
* objtype
)
1579 oberon_type_t
* type
;
1581 if(objtype
-> class != OBERON_CLASS_TYPE
)
1583 oberon_error(ctx
, "must be type");
1585 type
= objtype
-> type
;
1587 /* Охрана типа применима, если */
1588 /* 1. v - параметр-переменная типа запись, или v - указатель, и если */
1589 /* 2. T - расширение статического типа v */
1592 && expr
-> item
.mode
== MODE_VAR
1593 && expr
-> item
.var
-> class == OBERON_CLASS_VAR_PARAM
)
1597 else if(expr
-> result
-> class == OBERON_TYPE_POINTER
)
1603 oberon_error(ctx
, "guard type used only with var-param or pointers");
1606 oberon_check_record_compatibility(ctx
, type
, expr
-> result
);
1607 return oberno_make_record_cast(ctx
, expr
, objtype
-> type
);
1610 static oberon_expr_t
*
1611 oberon_designator(oberon_context_t
* ctx
)
1614 oberon_expr_t
* expr
;
1615 oberon_object_t
* objtype
;
1617 expr
= oberon_qualident_expr(ctx
);
1619 while(expr
-> result
-> class != OBERON_TYPE_PROCEDURE
&& ISSELECTOR(ctx
-> token
))
1621 switch(ctx
-> token
)
1624 oberon_assert_token(ctx
, DOT
);
1625 name
= oberon_assert_ident(ctx
);
1626 expr
= oberon_make_record_selector(ctx
, expr
, name
);
1629 oberon_assert_token(ctx
, LBRACK
);
1630 int num_indexes
= 0;
1631 oberon_expr_t
* indexes
= NULL
;
1632 oberon_expr_list(ctx
, &num_indexes
, &indexes
, 0);
1633 oberon_assert_token(ctx
, RBRACK
);
1635 for(int i
= 0; i
< num_indexes
; i
++)
1637 expr
= oberon_make_array_selector(ctx
, expr
, indexes
);
1638 indexes
= indexes
-> next
;
1642 oberon_assert_token(ctx
, UPARROW
);
1643 expr
= oberno_make_dereferencing(ctx
, expr
);
1646 oberon_assert_token(ctx
, LPAREN
);
1647 objtype
= oberon_qualident(ctx
, NULL
, true);
1648 oberon_assert_token(ctx
, RPAREN
);
1649 expr
= oberon_make_type_guard(ctx
, expr
, objtype
);
1652 oberon_error(ctx
, "oberon_designator: wat");
1660 static oberon_expr_t
*
1661 oberon_opt_func_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1663 /* Если есть скобки - значит вызов. Если нет, то передаём указатель. */
1664 if(ctx
-> token
== LPAREN
)
1666 oberon_assert_token(ctx
, LPAREN
);
1669 oberon_expr_t
* arguments
= NULL
;
1671 if(ISEXPR(ctx
-> token
))
1673 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
1676 assert(expr
-> is_item
== 1);
1677 expr
= oberon_make_call_func(ctx
, (oberon_item_t
*) expr
, num_args
, arguments
);
1679 oberon_assert_token(ctx
, RPAREN
);
1686 oberon_opt_proc_parens(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
1688 assert(expr
-> is_item
);
1691 oberon_expr_t
* arguments
= NULL
;
1693 if(ctx
-> token
== LPAREN
)
1695 oberon_assert_token(ctx
, LPAREN
);
1697 if(ISEXPR(ctx
-> token
))
1699 oberon_expr_list(ctx
, &num_args
, &arguments
, 0);
1702 oberon_assert_token(ctx
, RPAREN
);
1705 /* Вызов происходит даже без скобок */
1706 oberon_make_call_proc(ctx
, (oberon_item_t
*) expr
, num_args
, arguments
);
1709 static oberon_type_t
*
1710 oberon_get_type_of_int_value(oberon_context_t
* ctx
, int64_t i
)
1712 if(i
>= -128 && i
<= 127)
1714 return ctx
-> byte_type
;
1716 else if(i
>= -32768 && i
<= 32767)
1718 return ctx
-> shortint_type
;
1720 else if(i
>= -2147483648 && i
<= 2147483647)
1722 return ctx
-> int_type
;
1726 return ctx
-> longint_type
;
1730 static oberon_expr_t
*
1731 oberon_integer_item(oberon_context_t
* ctx
, int64_t i
)
1733 oberon_expr_t
* expr
;
1734 oberon_type_t
* result
;
1735 result
= oberon_get_type_of_int_value(ctx
, i
);
1736 expr
= oberon_new_item(MODE_INTEGER
, result
, true);
1737 expr
-> item
.integer
= i
;
1741 static oberon_expr_t
*
1742 oberon_element(oberon_context_t
* ctx
)
1747 e1
= oberon_expr(ctx
);
1748 if(e1
-> result
-> class != OBERON_TYPE_INTEGER
)
1750 oberon_error(ctx
, "expected integer");
1754 if(ctx
-> token
== DOTDOT
)
1756 oberon_assert_token(ctx
, DOTDOT
);
1757 e2
= oberon_expr(ctx
);
1758 if(e2
-> result
-> class != OBERON_TYPE_INTEGER
)
1760 oberon_error(ctx
, "expected integer");
1764 oberon_expr_t
* set
;
1765 set
= oberon_new_operator(OP_RANGE
, ctx
-> set_type
, e1
, e2
);
1769 static oberon_expr_t
*
1770 oberon_set(oberon_context_t
* ctx
)
1772 oberon_expr_t
* set
;
1773 oberon_expr_t
* elements
;
1774 set
= oberon_new_item(MODE_SET
, ctx
-> set_type
, true);
1775 set
-> item
.integer
= 0;
1777 oberon_assert_token(ctx
, LBRACE
);
1778 if(ISEXPR(ctx
-> token
))
1780 elements
= oberon_element(ctx
);
1781 set
= oberon_new_operator(OP_UNION
, ctx
-> set_type
, set
, elements
);
1782 while(ctx
-> token
== COMMA
)
1784 oberon_assert_token(ctx
, COMMA
);
1785 elements
= oberon_element(ctx
);
1786 set
= oberon_new_operator(OP_UNION
, ctx
-> set_type
, set
, elements
);
1789 oberon_assert_token(ctx
, RBRACE
);
1794 static oberon_expr_t
*
1795 oberon_make_boolean(oberon_context_t
* ctx
, bool cond
)
1797 oberon_expr_t
* expr
;
1798 expr
= oberon_new_item(MODE_BOOLEAN
, ctx
-> bool_type
, true);
1799 expr
-> item
.integer
= cond
;
1803 static oberon_expr_t
*
1804 oberon_factor(oberon_context_t
* ctx
)
1806 oberon_expr_t
* expr
;
1807 oberon_type_t
* result
;
1809 switch(ctx
-> token
)
1812 expr
= oberon_designator(ctx
);
1813 expr
= oberon_opt_func_parens(ctx
, expr
);
1816 expr
= oberon_integer_item(ctx
, ctx
-> integer
);
1817 oberon_assert_token(ctx
, INTEGER
);
1820 result
= ctx
-> char_type
;
1821 expr
= oberon_new_item(MODE_CHAR
, result
, true);
1822 expr
-> item
.integer
= ctx
-> integer
;
1823 oberon_assert_token(ctx
, CHAR
);
1826 result
= ctx
-> string_type
;
1827 expr
= oberon_new_item(MODE_STRING
, result
, true);
1828 expr
-> item
.string
= ctx
-> string
;
1829 oberon_assert_token(ctx
, STRING
);
1832 result
= (ctx
-> longmode
) ? (ctx
-> longreal_type
) : (ctx
-> real_type
);
1833 expr
= oberon_new_item(MODE_REAL
, result
, 1);
1834 expr
-> item
.real
= ctx
-> real
;
1835 oberon_assert_token(ctx
, REAL
);
1838 expr
= oberon_set(ctx
);
1841 oberon_assert_token(ctx
, LPAREN
);
1842 expr
= oberon_expr(ctx
);
1843 oberon_assert_token(ctx
, RPAREN
);
1846 oberon_assert_token(ctx
, NOT
);
1847 expr
= oberon_factor(ctx
);
1848 expr
= oberon_make_unary_op(ctx
, NOT
, expr
);
1851 oberon_assert_token(ctx
, NIL
);
1852 expr
= oberon_new_item(MODE_NIL
, ctx
-> nil_type
, true);
1855 oberon_error(ctx
, "invalid expression");
1861 #define ITMAKESBOOLEAN(x) \
1862 (((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
1864 #define ITUSEONLYINTEGER(x) \
1865 ((x) >= LESS && (x) <= GEQ)
1867 #define ITUSEONLYBOOLEAN(x) \
1868 (((x) == OR) || ((x) == AND))
1871 oberon_autocast_to_real(oberon_context_t
* ctx
, oberon_expr_t
** e
)
1873 oberon_expr_t
* expr
= *e
;
1874 if(expr
-> result
-> class == OBERON_TYPE_INTEGER
)
1876 if(expr
-> result
-> size
<= ctx
-> real_type
-> size
)
1878 *e
= oberon_cast_expr(ctx
, expr
, ctx
-> real_type
);
1882 *e
= oberon_cast_expr(ctx
, expr
, ctx
-> longreal_type
);
1885 else if(expr
-> result
-> class != OBERON_TYPE_REAL
)
1887 oberon_error(ctx
, "required numeric type");
1891 static oberon_expr_t
*
1892 oberon_make_bin_op(oberon_context_t
* ctx
, int token
, oberon_expr_t
* a
, oberon_expr_t
* b
)
1894 oberon_expr_t
* expr
;
1895 oberon_type_t
* result
;
1900 if(a
-> result
-> class != OBERON_TYPE_INTEGER
)
1902 oberon_error(ctx
, "must be integer");
1905 if(b
-> result
-> class != OBERON_TYPE_SET
)
1907 oberon_error(ctx
, "must be set");
1910 result
= ctx
-> bool_type
;
1911 expr
= oberon_new_operator(OP_IN
, result
, a
, b
);
1913 else if(token
== IS
)
1915 oberon_type_t
* v
= a
-> result
;
1916 if(v
-> class == OBERON_TYPE_POINTER
)
1919 if(v
-> class != OBERON_TYPE_RECORD
)
1921 oberon_error(ctx
, "must be record");
1924 else if(v
-> class != OBERON_TYPE_RECORD
)
1926 oberon_error(ctx
, "must be record");
1929 if(b
-> is_item
== false || b
-> item
.mode
!= MODE_TYPE
)
1931 oberon_error(ctx
, "requires type");
1934 oberon_type_t
* t
= b
-> result
;
1935 if(t
-> class == OBERON_TYPE_POINTER
)
1938 if(t
-> class != OBERON_TYPE_RECORD
)
1940 oberon_error(ctx
, "must be record");
1943 else if(t
-> class != OBERON_TYPE_RECORD
)
1945 oberon_error(ctx
, "must be record");
1948 result
= ctx
-> bool_type
;
1949 expr
= oberon_new_operator(OP_IS
, result
, a
, b
);
1951 else if(ITMAKESBOOLEAN(token
))
1953 if(ITUSEONLYINTEGER(token
))
1955 if(a
-> result
-> class == OBERON_TYPE_INTEGER
1956 || b
-> result
-> class == OBERON_TYPE_INTEGER
1957 || a
-> result
-> class == OBERON_TYPE_REAL
1958 || b
-> result
-> class == OBERON_TYPE_REAL
)
1964 oberon_error(ctx
, "used only with numeric types");
1967 else if(ITUSEONLYBOOLEAN(token
))
1969 if(a
-> result
-> class != OBERON_TYPE_BOOLEAN
1970 || b
-> result
-> class != OBERON_TYPE_BOOLEAN
)
1972 oberon_error(ctx
, "used only with boolean type");
1976 oberon_autocast_binary_op(ctx
, &a
, &b
);
1977 result
= ctx
-> bool_type
;
1981 expr
= oberon_new_operator(OP_EQ
, result
, a
, b
);
1983 else if(token
== NEQ
)
1985 expr
= oberon_new_operator(OP_NEQ
, result
, a
, b
);
1987 else if(token
== LESS
)
1989 expr
= oberon_new_operator(OP_LSS
, result
, a
, b
);
1991 else if(token
== LEQ
)
1993 expr
= oberon_new_operator(OP_LEQ
, result
, a
, b
);
1995 else if(token
== GREAT
)
1997 expr
= oberon_new_operator(OP_GRT
, result
, a
, b
);
1999 else if(token
== GEQ
)
2001 expr
= oberon_new_operator(OP_GEQ
, result
, a
, b
);
2003 else if(token
== OR
)
2005 expr
= oberon_new_operator(OP_LOGIC_OR
, result
, a
, b
);
2007 else if(token
== AND
)
2009 expr
= oberon_new_operator(OP_LOGIC_AND
, result
, a
, b
);
2013 oberon_error(ctx
, "oberon_make_bin_op: bool wat");
2016 else if(token
== SLASH
)
2018 if(a
-> result
-> class == OBERON_TYPE_SET
2019 || b
-> result
-> class == OBERON_TYPE_SET
)
2021 oberon_autocast_binary_op(ctx
, &a
, &b
);
2022 result
= a
-> result
;
2023 expr
= oberon_new_operator(OP_SYM_DIFFERENCE
, result
, a
, b
);
2027 oberon_autocast_to_real(ctx
, &a
);
2028 oberon_autocast_to_real(ctx
, &b
);
2029 oberon_autocast_binary_op(ctx
, &a
, &b
);
2030 result
= a
-> result
;
2031 expr
= oberon_new_operator(OP_DIV
, result
, a
, b
);
2034 else if(token
== DIV
)
2036 if(a
-> result
-> class != OBERON_TYPE_INTEGER
2037 || b
-> result
-> class != OBERON_TYPE_INTEGER
)
2039 oberon_error(ctx
, "operator DIV requires integer type");
2042 oberon_autocast_binary_op(ctx
, &a
, &b
);
2043 expr
= oberon_new_operator(OP_DIV
, a
-> result
, a
, b
);
2047 oberon_autocast_binary_op(ctx
, &a
, &b
);
2048 result
= a
-> result
;
2049 if(result
-> class == OBERON_TYPE_SET
)
2054 expr
= oberon_new_operator(OP_UNION
, result
, a
, b
);
2057 expr
= oberon_new_operator(OP_DIFFERENCE
, result
, a
, b
);
2060 expr
= oberon_new_operator(OP_INTERSECTION
, result
, a
, b
);
2067 else if(result
-> class == OBERON_TYPE_INTEGER
2068 || result
-> class == OBERON_TYPE_REAL
)
2073 expr
= oberon_new_operator(OP_ADD
, result
, a
, b
);
2076 expr
= oberon_new_operator(OP_SUB
, result
, a
, b
);
2079 expr
= oberon_new_operator(OP_MUL
, result
, a
, b
);
2082 expr
= oberon_new_operator(OP_MOD
, result
, a
, b
);
2097 oberon_error(ctx
, "invalid operation");
2103 #define ISMULOP(x) \
2104 ((x) >= STAR && (x) <= AND)
2106 static oberon_expr_t
*
2107 oberon_term_expr(oberon_context_t
* ctx
)
2109 oberon_expr_t
* expr
;
2111 expr
= oberon_factor(ctx
);
2112 while(ISMULOP(ctx
-> token
))
2114 int token
= ctx
-> token
;
2115 oberon_read_token(ctx
);
2117 oberon_expr_t
* inter
= oberon_factor(ctx
);
2118 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2124 #define ISADDOP(x) \
2125 ((x) >= PLUS && (x) <= OR)
2127 static oberon_expr_t
*
2128 oberon_simple_expr(oberon_context_t
* ctx
)
2130 oberon_expr_t
* expr
;
2133 if(ctx
-> token
== PLUS
)
2136 oberon_assert_token(ctx
, PLUS
);
2138 else if(ctx
-> token
== MINUS
)
2141 oberon_assert_token(ctx
, MINUS
);
2144 expr
= oberon_term_expr(ctx
);
2148 expr
= oberon_make_unary_op(ctx
, MINUS
, expr
);
2151 while(ISADDOP(ctx
-> token
))
2153 int token
= ctx
-> token
;
2154 oberon_read_token(ctx
);
2156 oberon_expr_t
* inter
= oberon_term_expr(ctx
);
2157 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2163 #define ISRELATION(x) \
2164 ((x) >= EQUAL && (x) <= IS)
2166 static oberon_expr_t
*
2167 oberon_expr(oberon_context_t
* ctx
)
2169 oberon_expr_t
* expr
;
2171 expr
= oberon_simple_expr(ctx
);
2172 while(ISRELATION(ctx
-> token
))
2174 int token
= ctx
-> token
;
2175 oberon_read_token(ctx
);
2177 oberon_expr_t
* inter
= oberon_simple_expr(ctx
);
2178 expr
= oberon_make_bin_op(ctx
, token
, expr
, inter
);
2185 oberon_check_const(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
2187 if(expr
-> is_item
== 0)
2189 oberon_error(ctx
, "const expression are required");
2192 switch(expr
-> item
.mode
)
2204 oberon_error(ctx
, "const expression are required");
2209 static oberon_item_t
*
2210 oberon_const_expr(oberon_context_t
* ctx
)
2212 oberon_expr_t
* expr
;
2213 expr
= oberon_expr(ctx
);
2214 oberon_check_const(ctx
, expr
);
2215 return (oberon_item_t
*) expr
;
2218 // =======================================================================
2220 // =======================================================================
2222 static void oberon_decl_seq(oberon_context_t
* ctx
);
2223 static void oberon_statement_seq(oberon_context_t
* ctx
);
2224 static void oberon_initialize_decl(oberon_context_t
* ctx
);
2227 oberon_expect_token(oberon_context_t
* ctx
, int token
)
2229 if(ctx
-> token
!= token
)
2231 oberon_error(ctx
, "unexpected token %i (%i)", ctx
-> token
, token
);
2236 oberon_assert_token(oberon_context_t
* ctx
, int token
)
2238 oberon_expect_token(ctx
, token
);
2239 oberon_read_token(ctx
);
2243 oberon_assert_ident(oberon_context_t
* ctx
)
2245 oberon_expect_token(ctx
, IDENT
);
2246 char * ident
= ctx
-> string
;
2247 oberon_read_token(ctx
);
2252 oberon_def(oberon_context_t
* ctx
, int * export
, int * read_only
)
2254 switch(ctx
-> token
)
2257 oberon_assert_token(ctx
, STAR
);
2262 oberon_assert_token(ctx
, MINUS
);
2273 static oberon_object_t
*
2274 oberon_ident_def(oberon_context_t
* ctx
, int class, bool check_upscope
)
2279 oberon_object_t
* x
;
2281 name
= oberon_assert_ident(ctx
);
2282 oberon_def(ctx
, &export
, &read_only
);
2284 x
= oberon_define_object(ctx
-> decl
, name
, class, export
, read_only
, check_upscope
);
2289 oberon_ident_list(oberon_context_t
* ctx
, int class, bool check_upscope
, int * num
, oberon_object_t
** list
)
2292 *list
= oberon_ident_def(ctx
, class, check_upscope
);
2293 while(ctx
-> token
== COMMA
)
2295 oberon_assert_token(ctx
, COMMA
);
2296 oberon_ident_def(ctx
, class, check_upscope
);
2302 oberon_var_decl(oberon_context_t
* ctx
)
2305 oberon_object_t
* list
;
2306 oberon_type_t
* type
;
2307 type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2309 oberon_ident_list(ctx
, OBERON_CLASS_VAR
, false, &num
, &list
);
2310 oberon_assert_token(ctx
, COLON
);
2311 oberon_type(ctx
, &type
);
2313 oberon_object_t
* var
= list
;
2314 for(int i
= 0; i
< num
; i
++)
2321 static oberon_object_t
*
2322 oberon_fp_section(oberon_context_t
* ctx
, int * num_decl
)
2324 int class = OBERON_CLASS_PARAM
;
2325 if(ctx
-> token
== VAR
)
2327 oberon_read_token(ctx
);
2328 class = OBERON_CLASS_VAR_PARAM
;
2332 oberon_object_t
* list
;
2333 oberon_ident_list(ctx
, class, false, &num
, &list
);
2335 oberon_assert_token(ctx
, COLON
);
2337 oberon_type_t
* type
;
2338 type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2339 oberon_type(ctx
, &type
);
2341 oberon_object_t
* param
= list
;
2342 for(int i
= 0; i
< num
; i
++)
2344 param
-> type
= type
;
2345 param
= param
-> next
;
2352 #define ISFPSECTION \
2353 ((ctx -> token == VAR) || (ctx -> token == IDENT))
2356 oberon_formal_pars(oberon_context_t
* ctx
, oberon_type_t
* signature
)
2358 oberon_assert_token(ctx
, LPAREN
);
2362 signature
-> decl
= oberon_fp_section(ctx
, &signature
-> num_decl
);
2363 while(ctx
-> token
== SEMICOLON
)
2365 oberon_assert_token(ctx
, SEMICOLON
);
2366 oberon_fp_section(ctx
, &signature
-> num_decl
);
2370 oberon_assert_token(ctx
, RPAREN
);
2372 if(ctx
-> token
== COLON
)
2374 oberon_assert_token(ctx
, COLON
);
2376 oberon_object_t
* typeobj
;
2377 typeobj
= oberon_qualident(ctx
, NULL
, 1);
2378 if(typeobj
-> class != OBERON_CLASS_TYPE
)
2380 oberon_error(ctx
, "function result is not type");
2382 signature
-> base
= typeobj
-> type
;
2387 oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
)
2389 oberon_type_t
* signature
;
2391 signature
-> class = OBERON_TYPE_PROCEDURE
;
2392 signature
-> num_decl
= 0;
2393 signature
-> base
= ctx
-> notype_type
;
2394 signature
-> decl
= NULL
;
2396 if(ctx
-> token
== LPAREN
)
2398 oberon_formal_pars(ctx
, signature
);
2403 oberon_compare_signatures(oberon_context_t
* ctx
, oberon_type_t
* a
, oberon_type_t
* b
)
2405 if(a
-> num_decl
!= b
-> num_decl
)
2407 oberon_error(ctx
, "number parameters not matched");
2410 int num_param
= a
-> num_decl
;
2411 oberon_object_t
* param_a
= a
-> decl
;
2412 oberon_object_t
* param_b
= b
-> decl
;
2413 for(int i
= 0; i
< num_param
; i
++)
2415 if(strcmp(param_a
-> name
, param_b
-> name
) != 0)
2417 oberon_error(ctx
, "param %i name not matched", i
+ 1);
2420 if(param_a
-> type
!= param_b
-> type
)
2422 oberon_error(ctx
, "param %i type not matched", i
+ 1);
2425 param_a
= param_a
-> next
;
2426 param_b
= param_b
-> next
;
2431 oberon_make_return(oberon_context_t
* ctx
, oberon_expr_t
* expr
)
2433 oberon_object_t
* proc
= ctx
-> decl
-> parent
;
2434 oberon_type_t
* result_type
= proc
-> type
-> base
;
2436 if(result_type
-> class == OBERON_TYPE_NOTYPE
)
2440 oberon_error(ctx
, "procedure has no result type");
2447 oberon_error(ctx
, "procedure requires expression on result");
2450 expr
= oberon_autocast_to(ctx
, expr
, result_type
);
2453 proc
-> has_return
= 1;
2455 oberon_generate_return(ctx
, expr
);
2459 oberon_proc_decl_body(oberon_context_t
* ctx
, oberon_object_t
* proc
)
2461 oberon_assert_token(ctx
, SEMICOLON
);
2463 ctx
-> decl
= proc
-> scope
;
2465 oberon_decl_seq(ctx
);
2467 oberon_generate_begin_proc(ctx
, proc
);
2469 if(ctx
-> token
== BEGIN
)
2471 oberon_assert_token(ctx
, BEGIN
);
2472 oberon_statement_seq(ctx
);
2475 oberon_assert_token(ctx
, END
);
2476 char * name
= oberon_assert_ident(ctx
);
2477 if(strcmp(name
, proc
-> name
) != 0)
2479 oberon_error(ctx
, "procedure name not matched");
2482 if(proc
-> type
-> base
-> class == OBERON_TYPE_NOTYPE
2483 && proc
-> has_return
== 0)
2485 oberon_make_return(ctx
, NULL
);
2488 if(proc
-> has_return
== 0)
2490 oberon_error(ctx
, "procedure requires return");
2493 oberon_generate_end_proc(ctx
);
2494 oberon_close_scope(ctx
-> decl
);
2498 oberon_proc_decl(oberon_context_t
* ctx
)
2500 oberon_assert_token(ctx
, PROCEDURE
);
2503 if(ctx
-> token
== UPARROW
)
2505 oberon_assert_token(ctx
, UPARROW
);
2512 name
= oberon_assert_ident(ctx
);
2513 oberon_def(ctx
, &export
, &read_only
);
2515 oberon_scope_t
* proc_scope
;
2516 proc_scope
= oberon_open_scope(ctx
);
2517 ctx
-> decl
-> local
= 1;
2519 oberon_type_t
* signature
;
2520 signature
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2521 oberon_opt_formal_pars(ctx
, &signature
);
2523 //oberon_initialize_decl(ctx);
2524 oberon_generator_init_type(ctx
, signature
);
2525 oberon_close_scope(ctx
-> decl
);
2527 oberon_object_t
* proc
;
2528 proc
= oberon_find_object(ctx
-> decl
, name
, 0);
2531 proc
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_PROC
, export
, read_only
, false);
2532 proc
-> type
= signature
;
2533 proc
-> scope
= proc_scope
;
2534 oberon_generator_init_proc(ctx
, proc
);
2538 if(proc
-> class != OBERON_CLASS_PROC
)
2540 oberon_error(ctx
, "mult definition");
2547 oberon_error(ctx
, "mult procedure definition");
2551 if(proc
-> export
!= export
|| proc
-> read_only
!= read_only
)
2553 oberon_error(ctx
, "export type not matched");
2556 oberon_compare_signatures(ctx
, proc
-> type
, signature
);
2559 proc_scope
-> parent
= proc
;
2560 oberon_object_t
* param
= proc_scope
-> list
-> next
;
2563 param
-> parent
= proc
;
2564 param
= param
-> next
;
2570 oberon_proc_decl_body(ctx
, proc
);
2575 oberon_const_decl(oberon_context_t
* ctx
)
2577 oberon_item_t
* value
;
2578 oberon_object_t
* constant
;
2580 constant
= oberon_ident_def(ctx
, OBERON_CLASS_CONST
, false);
2581 oberon_assert_token(ctx
, EQUAL
);
2582 value
= oberon_const_expr(ctx
);
2583 constant
-> value
= value
;
2587 oberon_make_array_type(oberon_context_t
* ctx
, oberon_expr_t
* size
, oberon_type_t
* base
, oberon_type_t
** type
)
2589 if(size
-> is_item
== 0)
2591 oberon_error(ctx
, "requires constant");
2594 if(size
-> item
.mode
!= MODE_INTEGER
)
2596 oberon_error(ctx
, "requires integer constant");
2599 oberon_type_t
* arr
;
2601 arr
-> class = OBERON_TYPE_ARRAY
;
2602 arr
-> size
= size
-> item
.integer
;
2607 oberon_qualident_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
2610 oberon_object_t
* to
;
2612 to
= oberon_qualident(ctx
, &name
, 0);
2614 //name = oberon_assert_ident(ctx);
2615 //to = oberon_find_object(ctx -> decl, name, 0);
2619 if(to
-> class != OBERON_CLASS_TYPE
)
2621 oberon_error(ctx
, "not a type");
2626 to
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
, false, false, false);
2627 to
-> type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2633 static void oberon_opt_formal_pars(oberon_context_t
* ctx
, oberon_type_t
** type
);
2636 * Правило граматики "type". Указатель type должен указывать на существующий объект!
2640 oberon_make_multiarray(oberon_context_t
* ctx
, oberon_expr_t
* sizes
, oberon_type_t
* base
, oberon_type_t
** type
)
2648 oberon_type_t
* dim
;
2649 dim
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2651 oberon_make_multiarray(ctx
, sizes
-> next
, base
, &dim
);
2653 oberon_make_array_type(ctx
, sizes
, dim
, type
);
2657 oberon_make_open_array(oberon_context_t
* ctx
, oberon_type_t
* base
, oberon_type_t
* type
)
2659 type
-> class = OBERON_TYPE_ARRAY
;
2661 type
-> base
= base
;
2665 oberon_field_list(oberon_context_t
* ctx
, oberon_type_t
* rec
, oberon_scope_t
* modscope
)
2667 if(ctx
-> token
== IDENT
)
2670 oberon_object_t
* list
;
2671 oberon_type_t
* type
;
2672 type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2674 oberon_ident_list(ctx
, OBERON_CLASS_FIELD
, true, &num
, &list
);
2675 oberon_assert_token(ctx
, COLON
);
2677 oberon_scope_t
* current
= ctx
-> decl
;
2678 ctx
-> decl
= modscope
;
2679 oberon_type(ctx
, &type
);
2680 ctx
-> decl
= current
;
2682 oberon_object_t
* field
= list
;
2683 for(int i
= 0; i
< num
; i
++)
2685 field
-> type
= type
;
2686 field
= field
-> next
;
2689 rec
-> num_decl
+= num
;
2694 oberon_type_record_body(oberon_context_t
* ctx
, oberon_type_t
* rec
)
2696 oberon_scope_t
* modscope
= ctx
-> mod
-> decl
;
2697 oberon_scope_t
* oldscope
= ctx
-> decl
;
2698 ctx
-> decl
= modscope
;
2700 if(ctx
-> token
== LPAREN
)
2702 oberon_assert_token(ctx
, LPAREN
);
2704 oberon_object_t
* typeobj
;
2705 typeobj
= oberon_qualident(ctx
, NULL
, true);
2707 if(typeobj
-> class != OBERON_CLASS_TYPE
)
2709 oberon_error(ctx
, "base must be type");
2712 oberon_type_t
* base
= typeobj
-> type
;
2713 if(base
-> class == OBERON_TYPE_POINTER
)
2715 base
= base
-> base
;
2718 if(base
-> class != OBERON_TYPE_RECORD
)
2720 oberon_error(ctx
, "base must be record type");
2724 ctx
-> decl
= base
-> scope
;
2726 oberon_assert_token(ctx
, RPAREN
);
2733 oberon_scope_t
* this_scope
;
2734 this_scope
= oberon_open_scope(ctx
);
2735 this_scope
-> local
= true;
2736 this_scope
-> parent
= NULL
;
2737 this_scope
-> parent_type
= rec
;
2739 oberon_field_list(ctx
, rec
, modscope
);
2740 while(ctx
-> token
== SEMICOLON
)
2742 oberon_assert_token(ctx
, SEMICOLON
);
2743 oberon_field_list(ctx
, rec
, modscope
);
2746 rec
-> scope
= this_scope
;
2747 rec
-> decl
= this_scope
-> list
-> next
;
2748 ctx
-> decl
= oldscope
;
2752 oberon_type(oberon_context_t
* ctx
, oberon_type_t
** type
)
2754 if(ctx
-> token
== IDENT
)
2756 oberon_qualident_type(ctx
, type
);
2758 else if(ctx
-> token
== ARRAY
)
2760 oberon_assert_token(ctx
, ARRAY
);
2763 oberon_expr_t
* sizes
;
2765 if(ISEXPR(ctx
-> token
))
2767 oberon_expr_list(ctx
, &num_sizes
, &sizes
, 1);
2770 oberon_assert_token(ctx
, OF
);
2772 oberon_type_t
* base
;
2773 base
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2774 oberon_type(ctx
, &base
);
2778 oberon_make_open_array(ctx
, base
, *type
);
2782 oberon_make_multiarray(ctx
, sizes
, base
, type
);
2785 else if(ctx
-> token
== RECORD
)
2787 oberon_type_t
* rec
;
2789 rec
-> class = OBERON_TYPE_RECORD
;
2790 rec
-> module
= ctx
-> mod
;
2792 oberon_assert_token(ctx
, RECORD
);
2793 oberon_type_record_body(ctx
, rec
);
2794 oberon_assert_token(ctx
, END
);
2798 else if(ctx
-> token
== POINTER
)
2800 oberon_assert_token(ctx
, POINTER
);
2801 oberon_assert_token(ctx
, TO
);
2803 oberon_type_t
* base
;
2804 base
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2805 oberon_type(ctx
, &base
);
2807 oberon_type_t
* ptr
;
2809 ptr
-> class = OBERON_TYPE_POINTER
;
2812 else if(ctx
-> token
== PROCEDURE
)
2814 oberon_open_scope(ctx
);
2815 oberon_assert_token(ctx
, PROCEDURE
);
2816 oberon_opt_formal_pars(ctx
, type
);
2817 oberon_close_scope(ctx
-> decl
);
2821 oberon_error(ctx
, "invalid type declaration");
2826 oberon_type_decl(oberon_context_t
* ctx
)
2829 oberon_object_t
* newtype
;
2830 oberon_type_t
* type
;
2834 name
= oberon_assert_ident(ctx
);
2835 oberon_def(ctx
, &export
, &read_only
);
2837 newtype
= oberon_find_object(ctx
-> decl
, name
, 0);
2840 newtype
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_TYPE
, export
, read_only
, false);
2841 newtype
-> type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
2842 assert(newtype
-> type
);
2846 if(newtype
-> class != OBERON_CLASS_TYPE
)
2848 oberon_error(ctx
, "mult definition");
2851 if(newtype
-> linked
)
2853 oberon_error(ctx
, "mult definition - already linked");
2856 newtype
-> export
= export
;
2857 newtype
-> read_only
= read_only
;
2860 oberon_assert_token(ctx
, EQUAL
);
2862 type
= newtype
-> type
;
2863 oberon_type(ctx
, &type
);
2865 if(type
-> class == OBERON_TYPE_NOTYPE
)
2867 oberon_error(ctx
, "recursive alias declaration");
2870 newtype
-> type
= type
;
2871 newtype
-> linked
= 1;
2874 static void oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
2875 static void oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
2878 oberon_prevent_recursive_pointer(oberon_context_t
* ctx
, oberon_type_t
* type
)
2880 if(type
-> class != OBERON_TYPE_POINTER
2881 && type
-> class != OBERON_TYPE_ARRAY
)
2886 if(type
-> recursive
)
2888 oberon_error(ctx
, "recursive pointer declaration");
2891 if(type
-> class == OBERON_TYPE_POINTER
2892 && type
-> base
-> class == OBERON_TYPE_POINTER
)
2894 oberon_error(ctx
, "attempt to make pointer to pointer");
2897 type
-> recursive
= 1;
2899 oberon_prevent_recursive_pointer(ctx
, type
-> base
);
2901 type
-> recursive
= 0;
2905 oberon_prevent_recursive_record(oberon_context_t
* ctx
, oberon_type_t
* type
)
2907 if(type
-> class != OBERON_TYPE_RECORD
)
2912 if(type
-> recursive
)
2914 oberon_error(ctx
, "recursive record declaration");
2917 type
-> recursive
= 1;
2921 oberon_prevent_recursive_record(ctx
, type
-> base
);
2924 int num_fields
= type
-> num_decl
;
2925 oberon_object_t
* field
= type
-> decl
;
2926 for(int i
= 0; i
< num_fields
; i
++)
2928 oberon_prevent_recursive_object(ctx
, field
);
2929 field
= field
-> next
;
2932 type
-> recursive
= 0;
2935 oberon_prevent_recursive_procedure(oberon_context_t
* ctx
, oberon_type_t
* type
)
2937 if(type
-> class != OBERON_TYPE_PROCEDURE
)
2942 if(type
-> recursive
)
2944 oberon_error(ctx
, "recursive procedure declaration");
2947 type
-> recursive
= 1;
2949 int num_fields
= type
-> num_decl
;
2950 oberon_object_t
* field
= type
-> decl
;
2951 for(int i
= 0; i
< num_fields
; i
++)
2953 oberon_prevent_recursive_object(ctx
, field
);
2954 field
= field
-> next
;
2957 type
-> recursive
= 0;
2961 oberon_prevent_recursive_array(oberon_context_t
* ctx
, oberon_type_t
* type
)
2963 if(type
-> class != OBERON_TYPE_ARRAY
)
2968 if(type
-> recursive
)
2970 oberon_error(ctx
, "recursive array declaration");
2973 type
-> recursive
= 1;
2975 oberon_prevent_recursive_type(ctx
, type
-> base
);
2977 type
-> recursive
= 0;
2981 oberon_prevent_recursive_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
2983 if(type
-> class == OBERON_TYPE_POINTER
)
2985 oberon_prevent_recursive_pointer(ctx
, type
);
2987 else if(type
-> class == OBERON_TYPE_RECORD
)
2989 oberon_prevent_recursive_record(ctx
, type
);
2991 else if(type
-> class == OBERON_TYPE_ARRAY
)
2993 oberon_prevent_recursive_array(ctx
, type
);
2995 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
2997 oberon_prevent_recursive_procedure(ctx
, type
);
3002 oberon_prevent_recursive_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
3006 case OBERON_CLASS_VAR
:
3007 case OBERON_CLASS_TYPE
:
3008 case OBERON_CLASS_PARAM
:
3009 case OBERON_CLASS_VAR_PARAM
:
3010 case OBERON_CLASS_FIELD
:
3011 oberon_prevent_recursive_type(ctx
, x
-> type
);
3013 case OBERON_CLASS_CONST
:
3014 case OBERON_CLASS_PROC
:
3015 case OBERON_CLASS_MODULE
:
3018 oberon_error(ctx
, "oberon_prevent_recursive_object: wat");
3024 oberon_prevent_recursive_decl(oberon_context_t
* ctx
)
3026 oberon_object_t
* x
= ctx
-> decl
-> list
-> next
;
3030 oberon_prevent_recursive_object(ctx
, x
);
3035 static void oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
);
3036 static void oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
);
3039 oberon_initialize_record_fields(oberon_context_t
* ctx
, oberon_type_t
* type
)
3041 if(type
-> class != OBERON_TYPE_RECORD
)
3046 int num_fields
= type
-> num_decl
;
3047 oberon_object_t
* field
= type
-> decl
;
3048 for(int i
= 0; i
< num_fields
; i
++)
3050 if(field
-> type
-> class == OBERON_TYPE_POINTER
)
3052 oberon_initialize_type(ctx
, field
-> type
);
3055 oberon_initialize_object(ctx
, field
);
3056 field
= field
-> next
;
3059 oberon_generator_init_record(ctx
, type
);
3063 oberon_initialize_type(oberon_context_t
* ctx
, oberon_type_t
* type
)
3065 if(type
-> class == OBERON_TYPE_NOTYPE
)
3067 oberon_error(ctx
, "undeclarated type");
3070 if(type
-> initialized
)
3075 type
-> initialized
= 1;
3077 if(type
-> class == OBERON_TYPE_POINTER
)
3079 oberon_initialize_type(ctx
, type
-> base
);
3080 oberon_generator_init_type(ctx
, type
);
3082 else if(type
-> class == OBERON_TYPE_ARRAY
)
3084 if(type
-> size
!= 0)
3086 if(type
-> base
-> class == OBERON_TYPE_ARRAY
)
3088 if(type
-> base
-> size
== 0)
3090 oberon_error(ctx
, "open array not allowed as array element");
3095 oberon_initialize_type(ctx
, type
-> base
);
3096 oberon_generator_init_type(ctx
, type
);
3098 else if(type
-> class == OBERON_TYPE_RECORD
)
3100 oberon_generator_init_type(ctx
, type
);
3101 oberon_initialize_record_fields(ctx
, type
);
3103 else if(type
-> class == OBERON_TYPE_PROCEDURE
)
3105 int num_fields
= type
-> num_decl
;
3106 oberon_object_t
* field
= type
-> decl
;
3107 for(int i
= 0; i
< num_fields
; i
++)
3109 oberon_initialize_object(ctx
, field
);
3110 field
= field
-> next
;
3113 oberon_generator_init_type(ctx
, type
);
3117 oberon_generator_init_type(ctx
, type
);
3122 oberon_initialize_object(oberon_context_t
* ctx
, oberon_object_t
* x
)
3124 if(x
-> initialized
)
3129 x
-> initialized
= 1;
3133 case OBERON_CLASS_TYPE
:
3134 oberon_initialize_type(ctx
, x
-> type
);
3136 case OBERON_CLASS_VAR
:
3137 case OBERON_CLASS_FIELD
:
3138 if(x
-> type
-> class == OBERON_TYPE_ARRAY
)
3140 if(x
-> type
-> size
== 0)
3142 oberon_error(ctx
, "open array not allowed as variable or field");
3145 oberon_initialize_type(ctx
, x
-> type
);
3146 oberon_generator_init_var(ctx
, x
);
3148 case OBERON_CLASS_PARAM
:
3149 case OBERON_CLASS_VAR_PARAM
:
3150 oberon_initialize_type(ctx
, x
-> type
);
3151 oberon_generator_init_var(ctx
, x
);
3153 case OBERON_CLASS_CONST
:
3154 case OBERON_CLASS_PROC
:
3155 case OBERON_CLASS_MODULE
:
3158 oberon_error(ctx
, "oberon_initialize_object: wat");
3164 oberon_initialize_decl(oberon_context_t
* ctx
)
3166 oberon_object_t
* x
= ctx
-> decl
-> list
;
3170 oberon_initialize_object(ctx
, x
-> next
);
3176 oberon_prevent_undeclarated_procedures(oberon_context_t
* ctx
)
3178 oberon_object_t
* x
= ctx
-> decl
-> list
;
3182 if(x
-> next
-> class == OBERON_CLASS_PROC
)
3184 if(x
-> next
-> linked
== 0)
3186 oberon_error(ctx
, "unresolved forward declaration");
3194 oberon_decl_seq(oberon_context_t
* ctx
)
3196 if(ctx
-> token
== CONST
)
3198 oberon_assert_token(ctx
, CONST
);
3199 while(ctx
-> token
== IDENT
)
3201 oberon_const_decl(ctx
);
3202 oberon_assert_token(ctx
, SEMICOLON
);
3206 if(ctx
-> token
== TYPE
)
3208 oberon_assert_token(ctx
, TYPE
);
3209 while(ctx
-> token
== IDENT
)
3211 oberon_type_decl(ctx
);
3212 oberon_assert_token(ctx
, SEMICOLON
);
3216 if(ctx
-> token
== VAR
)
3218 oberon_assert_token(ctx
, VAR
);
3219 while(ctx
-> token
== IDENT
)
3221 oberon_var_decl(ctx
);
3222 oberon_assert_token(ctx
, SEMICOLON
);
3226 oberon_prevent_recursive_decl(ctx
);
3227 oberon_initialize_decl(ctx
);
3229 while(ctx
-> token
== PROCEDURE
)
3231 oberon_proc_decl(ctx
);
3232 oberon_assert_token(ctx
, SEMICOLON
);
3235 oberon_prevent_undeclarated_procedures(ctx
);
3238 static oberon_expr_t
*
3239 oberon_make_temp_var_item(oberon_context_t
* ctx
, oberon_type_t
* type
)
3241 oberon_object_t
* x
;
3242 oberon_expr_t
* expr
;
3244 x
= oberon_create_object(ctx
-> decl
, "TEMP", OBERON_CLASS_VAR
, false, false);
3247 oberon_generator_init_temp_var(ctx
, x
);
3249 expr
= oberon_new_item(MODE_VAR
, type
, false);
3250 expr
-> item
.var
= x
;
3255 oberon_statement_seq(oberon_context_t
* ctx
);
3258 oberon_assign(oberon_context_t
* ctx
, oberon_expr_t
* src
, oberon_expr_t
* dst
)
3260 if(dst
-> read_only
)
3262 oberon_error(ctx
, "read-only destination");
3265 oberon_check_dst(ctx
, dst
);
3266 src
= oberon_autocast_to(ctx
, src
, dst
-> result
);
3267 oberon_generate_assign(ctx
, src
, dst
);
3270 static oberon_expr_t
*
3271 oberon_case_labels(oberon_context_t
* ctx
, oberon_expr_t
* val
)
3275 oberon_expr_t
* cond
;
3276 oberon_expr_t
* cond2
;
3278 e1
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3279 oberon_autocast_to(ctx
, e1
, val
-> result
);
3282 if(ctx
-> token
== DOTDOT
)
3284 oberon_assert_token(ctx
, DOTDOT
);
3285 e2
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3286 oberon_autocast_to(ctx
, e2
, val
-> result
);
3292 cond
= oberon_make_bin_op(ctx
, EQUAL
, val
, e1
);
3296 /* val >= e1 && val <= e2 */
3297 cond
= oberon_make_bin_op(ctx
, GEQ
, val
, e1
);
3298 cond2
= oberon_make_bin_op(ctx
, LEQ
, val
, e2
);
3299 cond
= oberon_make_bin_op(ctx
, AND
, cond
, cond2
);
3306 oberon_case(oberon_context_t
* ctx
, oberon_expr_t
* val
, gen_label_t
* end
)
3308 oberon_expr_t
* cond
;
3309 oberon_expr_t
* cond2
;
3310 gen_label_t
* this_end
;
3312 if(ISEXPR(ctx
-> token
))
3314 this_end
= oberon_generator_reserve_label(ctx
);
3316 cond
= oberon_case_labels(ctx
, val
);
3317 while(ctx
-> token
== COMMA
)
3319 oberon_assert_token(ctx
, COMMA
);
3321 cond2
= oberon_case_labels(ctx
, val
);
3322 cond
= oberon_make_bin_op(ctx
, OR
, cond
, cond2
);
3324 oberon_assert_token(ctx
, COLON
);
3326 oberon_generate_branch(ctx
, cond
, false, this_end
);
3327 oberon_statement_seq(ctx
);
3328 oberon_generate_goto(ctx
, end
);
3330 oberon_generate_label(ctx
, this_end
);
3335 oberon_case_statement(oberon_context_t
* ctx
)
3337 oberon_expr_t
* val
;
3338 oberon_expr_t
* expr
;
3341 end
= oberon_generator_reserve_label(ctx
);
3343 oberon_assert_token(ctx
, CASE
);
3344 expr
= oberon_expr(ctx
);
3345 val
= oberon_make_temp_var_item(ctx
, expr
-> result
);
3346 oberon_assign(ctx
, expr
, val
);
3347 oberon_assert_token(ctx
, OF
);
3348 oberon_case(ctx
, val
, end
);
3349 while(ctx
-> token
== BAR
)
3351 oberon_assert_token(ctx
, BAR
);
3352 oberon_case(ctx
, val
, end
);
3355 if(ctx
-> token
== ELSE
)
3357 oberon_assert_token(ctx
, ELSE
);
3358 oberon_statement_seq(ctx
);
3361 oberon_generate_label(ctx
, end
);
3362 oberon_assert_token(ctx
, END
);
3366 oberon_with_guard_do(oberon_context_t
* ctx
, gen_label_t
* end
)
3368 oberon_expr_t
* val
;
3369 oberon_expr_t
* var
;
3370 oberon_expr_t
* type
;
3371 oberon_expr_t
* cond
;
3372 oberon_expr_t
* cast
;
3373 oberon_type_t
* old_type
;
3374 gen_var_t
* old_var
;
3375 gen_label_t
* this_end
;
3377 this_end
= oberon_generator_reserve_label(ctx
);
3379 var
= oberon_qualident_expr(ctx
);
3380 oberon_assert_token(ctx
, COLON
);
3381 type
= oberon_qualident_expr(ctx
);
3382 cond
= oberon_make_bin_op(ctx
, IS
, var
, type
);
3384 oberon_assert_token(ctx
, DO
);
3385 oberon_generate_branch(ctx
, cond
, false, this_end
);
3387 /* Сохраняем ссылку во временной переменной */
3388 val
= oberon_make_temp_var_item(ctx
, type
-> result
);
3389 cast
= oberno_make_record_cast(ctx
, var
, type
-> result
);
3390 oberon_assign(ctx
, cast
, val
);
3391 /* Подменяем тип у оригинальной переменной */
3392 old_type
= var
-> item
.var
-> type
;
3393 var
-> item
.var
-> type
= type
-> result
;
3394 /* Подменяем ссылку на переменную */
3395 old_var
= var
-> item
.var
-> gen_var
;
3396 var
-> item
.var
-> gen_var
= val
-> item
.var
-> gen_var
;
3398 oberon_statement_seq(ctx
);
3399 oberon_generate_goto(ctx
, end
);
3400 oberon_generate_label(ctx
, this_end
);
3402 /* Возвращаем исходное состояние */
3403 var
-> item
.var
-> gen_var
= old_var
;
3404 var
-> item
.var
-> type
= old_type
;
3408 oberon_with_statement(oberon_context_t
* ctx
)
3411 end
= oberon_generator_reserve_label(ctx
);
3413 oberon_assert_token(ctx
, WITH
);
3414 oberon_with_guard_do(ctx
, end
);
3415 while(ctx
-> token
== BAR
)
3417 oberon_assert_token(ctx
, BAR
);
3418 oberon_with_guard_do(ctx
, end
);
3421 if(ctx
-> token
== ELSE
)
3423 oberon_assert_token(ctx
, ELSE
);
3424 oberon_statement_seq(ctx
);
3427 oberon_generate_label(ctx
, end
);
3428 oberon_assert_token(ctx
, END
);
3432 oberon_statement(oberon_context_t
* ctx
)
3434 oberon_expr_t
* item1
;
3435 oberon_expr_t
* item2
;
3437 if(ctx
-> token
== IDENT
)
3439 item1
= oberon_designator(ctx
);
3440 if(ctx
-> token
== ASSIGN
)
3442 oberon_assert_token(ctx
, ASSIGN
);
3443 item2
= oberon_expr(ctx
);
3444 oberon_assign(ctx
, item2
, item1
);
3448 oberon_opt_proc_parens(ctx
, item1
);
3451 else if(ctx
-> token
== IF
)
3455 oberon_expr_t
* cond
;
3457 els
= oberon_generator_reserve_label(ctx
);
3458 end
= oberon_generator_reserve_label(ctx
);
3460 oberon_assert_token(ctx
, IF
);
3461 cond
= oberon_expr(ctx
);
3462 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3464 oberon_error(ctx
, "condition must be boolean");
3466 oberon_assert_token(ctx
, THEN
);
3467 oberon_generate_branch(ctx
, cond
, false, els
);
3468 oberon_statement_seq(ctx
);
3469 oberon_generate_goto(ctx
, end
);
3470 oberon_generate_label(ctx
, els
);
3472 while(ctx
-> token
== ELSIF
)
3474 els
= oberon_generator_reserve_label(ctx
);
3476 oberon_assert_token(ctx
, ELSIF
);
3477 cond
= oberon_expr(ctx
);
3478 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3480 oberon_error(ctx
, "condition must be boolean");
3482 oberon_assert_token(ctx
, THEN
);
3483 oberon_generate_branch(ctx
, cond
, false, els
);
3484 oberon_statement_seq(ctx
);
3485 oberon_generate_goto(ctx
, end
);
3486 oberon_generate_label(ctx
, els
);
3489 if(ctx
-> token
== ELSE
)
3491 oberon_assert_token(ctx
, ELSE
);
3492 oberon_statement_seq(ctx
);
3495 oberon_generate_label(ctx
, end
);
3496 oberon_assert_token(ctx
, END
);
3498 else if(ctx
-> token
== WHILE
)
3500 gen_label_t
* begin
;
3502 oberon_expr_t
* cond
;
3504 begin
= oberon_generator_reserve_label(ctx
);
3505 end
= oberon_generator_reserve_label(ctx
);
3507 oberon_assert_token(ctx
, WHILE
);
3508 oberon_generate_label(ctx
, begin
);
3509 cond
= oberon_expr(ctx
);
3510 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3512 oberon_error(ctx
, "condition must be boolean");
3514 oberon_generate_branch(ctx
, cond
, false, end
);
3516 oberon_assert_token(ctx
, DO
);
3517 oberon_statement_seq(ctx
);
3518 oberon_generate_goto(ctx
, begin
);
3520 oberon_assert_token(ctx
, END
);
3521 oberon_generate_label(ctx
, end
);
3523 else if(ctx
-> token
== REPEAT
)
3525 gen_label_t
* begin
;
3526 oberon_expr_t
* cond
;
3528 begin
= oberon_generator_reserve_label(ctx
);
3529 oberon_generate_label(ctx
, begin
);
3530 oberon_assert_token(ctx
, REPEAT
);
3532 oberon_statement_seq(ctx
);
3534 oberon_assert_token(ctx
, UNTIL
);
3536 cond
= oberon_expr(ctx
);
3537 if(cond
-> result
-> class != OBERON_TYPE_BOOLEAN
)
3539 oberon_error(ctx
, "condition must be boolean");
3542 oberon_generate_branch(ctx
, cond
, true, begin
);
3544 else if(ctx
-> token
== FOR
)
3546 oberon_expr_t
* from
;
3547 oberon_expr_t
* index
;
3549 oberon_expr_t
* bound
;
3551 oberon_expr_t
* cond
;
3552 oberon_expr_t
* count
;
3553 gen_label_t
* begin
;
3558 begin
= oberon_generator_reserve_label(ctx
);
3559 end
= oberon_generator_reserve_label(ctx
);
3561 oberon_assert_token(ctx
, FOR
);
3562 iname
= oberon_assert_ident(ctx
);
3563 index
= oberon_ident_item(ctx
, iname
);
3564 oberon_assert_token(ctx
, ASSIGN
);
3565 from
= oberon_expr(ctx
);
3566 oberon_assign(ctx
, from
, index
);
3567 oberon_assert_token(ctx
, TO
);
3568 bound
= oberon_make_temp_var_item(ctx
, index
-> result
);
3569 to
= oberon_expr(ctx
);
3570 oberon_assign(ctx
, to
, bound
);
3571 if(ctx
-> token
== BY
)
3573 oberon_assert_token(ctx
, BY
);
3574 by
= (oberon_expr_t
*) oberon_const_expr(ctx
);
3578 by
= oberon_integer_item(ctx
, 1);
3581 if(by
-> result
-> class != OBERON_TYPE_INTEGER
)
3583 oberon_error(ctx
, "must be integer");
3586 if(by
-> item
.integer
> 0)
3590 else if(by
-> item
.integer
< 0)
3596 oberon_error(ctx
, "zero step not allowed");
3599 oberon_assert_token(ctx
, DO
);
3600 oberon_generate_label(ctx
, begin
);
3601 cond
= oberon_make_bin_op(ctx
, op
, index
, bound
);
3602 oberon_generate_branch(ctx
, cond
, false, end
);
3603 oberon_statement_seq(ctx
);
3604 count
= oberon_make_bin_op(ctx
, PLUS
, index
, by
);
3605 oberon_assign(ctx
, count
, index
);
3606 oberon_generate_goto(ctx
, begin
);
3607 oberon_generate_label(ctx
, end
);
3608 oberon_assert_token(ctx
, END
);
3610 else if(ctx
-> token
== LOOP
)
3612 gen_label_t
* begin
;
3615 begin
= oberon_generator_reserve_label(ctx
);
3616 end
= oberon_generator_reserve_label(ctx
);
3618 oberon_open_scope(ctx
);
3619 oberon_assert_token(ctx
, LOOP
);
3620 oberon_generate_label(ctx
, begin
);
3621 ctx
-> decl
-> exit_label
= end
;
3622 oberon_statement_seq(ctx
);
3623 oberon_generate_goto(ctx
, begin
);
3624 oberon_generate_label(ctx
, end
);
3625 oberon_assert_token(ctx
, END
);
3626 oberon_close_scope(ctx
-> decl
);
3628 else if(ctx
-> token
== EXIT
)
3630 oberon_assert_token(ctx
, EXIT
);
3631 if(ctx
-> decl
-> exit_label
== NULL
)
3633 oberon_error(ctx
, "not in LOOP-END");
3635 oberon_generate_goto(ctx
, ctx
-> decl
-> exit_label
);
3637 else if(ctx
-> token
== CASE
)
3639 oberon_case_statement(ctx
);
3641 else if(ctx
-> token
== WITH
)
3643 oberon_with_statement(ctx
);
3645 else if(ctx
-> token
== RETURN
)
3647 oberon_assert_token(ctx
, RETURN
);
3648 if(ISEXPR(ctx
-> token
))
3650 oberon_expr_t
* expr
;
3651 expr
= oberon_expr(ctx
);
3652 oberon_make_return(ctx
, expr
);
3656 oberon_make_return(ctx
, NULL
);
3662 oberon_statement_seq(oberon_context_t
* ctx
)
3664 oberon_statement(ctx
);
3665 while(ctx
-> token
== SEMICOLON
)
3667 oberon_assert_token(ctx
, SEMICOLON
);
3668 oberon_statement(ctx
);
3673 oberon_import_module(oberon_context_t
* ctx
, char * alias
, char * name
)
3675 oberon_module_t
* m
= ctx
-> module_list
;
3676 while(m
&& strcmp(m
-> name
, name
) != 0)
3684 code
= ctx
-> import_module(name
);
3687 oberon_error(ctx
, "no such module");
3690 m
= oberon_compile_module(ctx
, code
);
3696 oberon_error(ctx
, "cyclic module import");
3699 oberon_object_t
* ident
;
3700 ident
= oberon_define_object(ctx
-> decl
, alias
, OBERON_CLASS_MODULE
, false, false, false);
3701 ident
-> module
= m
;
3705 oberon_import_decl(oberon_context_t
* ctx
)
3710 alias
= name
= oberon_assert_ident(ctx
);
3711 if(ctx
-> token
== ASSIGN
)
3713 oberon_assert_token(ctx
, ASSIGN
);
3714 name
= oberon_assert_ident(ctx
);
3717 oberon_import_module(ctx
, alias
, name
);
3721 oberon_import_list(oberon_context_t
* ctx
)
3723 oberon_assert_token(ctx
, IMPORT
);
3725 oberon_import_decl(ctx
);
3726 while(ctx
-> token
== COMMA
)
3728 oberon_assert_token(ctx
, COMMA
);
3729 oberon_import_decl(ctx
);
3732 oberon_assert_token(ctx
, SEMICOLON
);
3736 oberon_parse_module(oberon_context_t
* ctx
)
3740 oberon_read_token(ctx
);
3742 oberon_assert_token(ctx
, MODULE
);
3743 name1
= oberon_assert_ident(ctx
);
3744 oberon_assert_token(ctx
, SEMICOLON
);
3745 ctx
-> mod
-> name
= name1
;
3747 oberon_generator_init_module(ctx
, ctx
-> mod
);
3749 if(ctx
-> token
== IMPORT
)
3751 oberon_import_list(ctx
);
3754 oberon_decl_seq(ctx
);
3756 oberon_generate_begin_module(ctx
);
3757 if(ctx
-> token
== BEGIN
)
3759 oberon_assert_token(ctx
, BEGIN
);
3760 oberon_statement_seq(ctx
);
3762 oberon_generate_end_module(ctx
);
3764 oberon_assert_token(ctx
, END
);
3765 name2
= oberon_assert_ident(ctx
);
3766 oberon_expect_token(ctx
, DOT
);
3768 if(strcmp(name1
, name2
) != 0)
3770 oberon_error(ctx
, "module name not matched");
3773 oberon_generator_fini_module(ctx
-> mod
);
3776 // =======================================================================
3778 // =======================================================================
3781 register_default_types(oberon_context_t
* ctx
)
3783 ctx
-> notype_type
= oberon_new_type_ptr(OBERON_TYPE_NOTYPE
);
3784 oberon_generator_init_type(ctx
, ctx
-> notype_type
);
3786 ctx
-> nil_type
= oberon_new_type_ptr(OBERON_TYPE_NIL
);
3787 oberon_generator_init_type(ctx
, ctx
-> nil_type
);
3789 ctx
-> string_type
= oberon_new_type_string(1);
3790 oberon_generator_init_type(ctx
, ctx
-> string_type
);
3792 ctx
-> bool_type
= oberon_new_type_boolean();
3793 oberon_define_type(ctx
-> world_scope
, "BOOLEAN", ctx
-> bool_type
, 1);
3795 ctx
-> char_type
= oberon_new_type_char(1);
3796 oberon_define_type(ctx
-> world_scope
, "CHAR", ctx
-> char_type
, 1);
3798 ctx
-> byte_type
= oberon_new_type_integer(1);
3799 oberon_define_type(ctx
-> world_scope
, "SHORTINT", ctx
-> byte_type
, 1);
3801 ctx
-> shortint_type
= oberon_new_type_integer(2);
3802 oberon_define_type(ctx
-> world_scope
, "INTEGER", ctx
-> shortint_type
, 1);
3804 ctx
-> int_type
= oberon_new_type_integer(4);
3805 oberon_define_type(ctx
-> world_scope
, "LONGINT", ctx
-> int_type
, 1);
3807 ctx
-> longint_type
= oberon_new_type_integer(8);
3808 oberon_define_type(ctx
-> world_scope
, "HUGEINT", ctx
-> longint_type
, 1);
3810 ctx
-> real_type
= oberon_new_type_real(4);
3811 oberon_define_type(ctx
-> world_scope
, "REAL", ctx
-> real_type
, 1);
3813 ctx
-> longreal_type
= oberon_new_type_real(8);
3814 oberon_define_type(ctx
-> world_scope
, "LONGREAL", ctx
-> longreal_type
, 1);
3816 ctx
-> set_type
= oberon_new_type_set(4);
3817 oberon_define_type(ctx
-> world_scope
, "SET", ctx
-> set_type
, 1);
3821 oberon_new_intrinsic(oberon_context_t
* ctx
, char * name
, GenerateFuncCallback f
, GenerateProcCallback p
)
3823 oberon_object_t
* proc
;
3824 proc
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_PROC
, true, false, false);
3825 proc
-> type
= oberon_new_type_ptr(OBERON_TYPE_PROCEDURE
);
3826 proc
-> type
-> sysproc
= true;
3827 proc
-> type
-> genfunc
= f
;
3828 proc
-> type
-> genproc
= p
;
3831 static oberon_expr_t
*
3832 oberon_make_min_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3836 oberon_error(ctx
, "too few arguments");
3841 oberon_error(ctx
, "too mach arguments");
3844 oberon_expr_t
* arg
;
3847 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3849 oberon_error(ctx
, "MIN accept only type");
3852 oberon_expr_t
* expr
;
3853 int bits
= arg
-> result
-> size
* 8;
3854 switch(arg
-> result
-> class)
3856 case OBERON_TYPE_INTEGER
:
3857 expr
= oberon_integer_item(ctx
, -powl(2, bits
- 1));
3859 case OBERON_TYPE_SET
:
3860 expr
= oberon_integer_item(ctx
, 0);
3863 oberon_error(ctx
, "allowed only basic types");
3870 static oberon_expr_t
*
3871 oberon_make_max_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3875 oberon_error(ctx
, "too few arguments");
3880 oberon_error(ctx
, "too mach arguments");
3883 oberon_expr_t
* arg
;
3886 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3888 oberon_error(ctx
, "MAX accept only type");
3891 oberon_expr_t
* expr
;
3892 int bits
= arg
-> result
-> size
* 8;
3893 switch(arg
-> result
-> class)
3895 case OBERON_TYPE_INTEGER
:
3896 expr
= oberon_integer_item(ctx
, powl(2, bits
- 1) - 1);
3898 case OBERON_TYPE_SET
:
3899 expr
= oberon_integer_item(ctx
, bits
);
3902 oberon_error(ctx
, "allowed only basic types");
3909 static oberon_expr_t
*
3910 oberon_make_size_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3914 oberon_error(ctx
, "too few arguments");
3919 oberon_error(ctx
, "too mach arguments");
3922 oberon_expr_t
* arg
;
3925 if(!arg
-> is_item
|| arg
-> item
.mode
!= MODE_TYPE
)
3927 oberon_error(ctx
, "SIZE accept only type");
3931 oberon_expr_t
* expr
;
3932 oberon_type_t
* type
= arg
-> result
;
3933 switch(type
-> class)
3935 case OBERON_TYPE_INTEGER
:
3936 case OBERON_TYPE_BOOLEAN
:
3937 case OBERON_TYPE_REAL
:
3938 case OBERON_TYPE_CHAR
:
3939 case OBERON_TYPE_SET
:
3940 size
= type
-> size
;
3943 oberon_error(ctx
, "TODO SIZE");
3947 expr
= oberon_integer_item(ctx
, size
);
3951 static oberon_expr_t
*
3952 oberon_make_abs_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3956 oberon_error(ctx
, "too few arguments");
3961 oberon_error(ctx
, "too mach arguments");
3964 oberon_expr_t
* arg
;
3966 oberon_check_src(ctx
, arg
);
3968 oberon_type_t
* result_type
;
3969 result_type
= arg
-> result
;
3971 if(result_type
-> class != OBERON_TYPE_INTEGER
)
3973 oberon_error(ctx
, "ABS accepts only integers");
3976 oberon_expr_t
* expr
;
3977 expr
= oberon_new_operator(OP_ABS
, result_type
, arg
, NULL
);
3982 oberon_make_new_call(oberon_context_t
* ctx
, int num_args
, oberon_expr_t
* list_args
)
3986 oberon_error(ctx
, "too few arguments");
3990 oberon_expr_t
* dst
;
3992 oberon_check_dst(ctx
, dst
);
3994 oberon_type_t
* type
;
3995 type
= dst
-> result
;
3997 if(type
-> class != OBERON_TYPE_POINTER
)
3999 oberon_error(ctx
, "not a pointer");
4002 type
= type
-> base
;
4004 oberon_expr_t
* src
;
4005 src
= oberon_new_item(MODE_NEW
, dst
-> result
, 0);
4006 src
-> item
.num_args
= 0;
4007 src
-> item
.args
= NULL
;
4010 if(type
-> class == OBERON_TYPE_ARRAY
)
4012 if(type
-> size
== 0)
4014 oberon_type_t
* x
= type
;
4015 while(x
-> class == OBERON_TYPE_ARRAY
)
4025 if(num_args
< max_args
)
4027 oberon_error(ctx
, "too few arguments");
4030 if(num_args
> max_args
)
4032 oberon_error(ctx
, "too mach arguments");
4035 int num_sizes
= max_args
- 1;
4036 oberon_expr_t
* size_list
= list_args
-> next
;
4038 oberon_expr_t
* arg
= size_list
;
4039 for(int i
= 0; i
< max_args
- 1; i
++)
4041 oberon_check_src(ctx
, arg
);
4042 if(arg
-> result
-> class != OBERON_TYPE_INTEGER
)
4044 oberon_error(ctx
, "size must be integer");
4049 src
-> item
.num_args
= num_sizes
;
4050 src
-> item
.args
= size_list
;
4052 else if(type
-> class != OBERON_TYPE_RECORD
)
4054 oberon_error(ctx
, "oberon_make_new_call: wat");
4057 if(num_args
> max_args
)
4059 oberon_error(ctx
, "too mach arguments");
4062 oberon_assign(ctx
, src
, dst
);
4066 oberon_new_const(oberon_context_t
* ctx
, char * name
, oberon_expr_t
* expr
)
4068 oberon_object_t
* constant
;
4069 constant
= oberon_define_object(ctx
-> decl
, name
, OBERON_CLASS_CONST
, true, false, false);
4070 oberon_check_const(ctx
, expr
);
4071 constant
-> value
= (oberon_item_t
*) expr
;
4075 oberon_create_context(ModuleImportCallback import_module
)
4077 oberon_context_t
* ctx
= calloc(1, sizeof *ctx
);
4079 oberon_scope_t
* world_scope
;
4080 world_scope
= oberon_open_scope(ctx
);
4081 ctx
-> world_scope
= world_scope
;
4083 ctx
-> import_module
= import_module
;
4085 oberon_generator_init_context(ctx
);
4087 register_default_types(ctx
);
4090 oberon_new_const(ctx
, "TRUE", oberon_make_boolean(ctx
, true));
4091 oberon_new_const(ctx
, "FALSE", oberon_make_boolean(ctx
, false));
4094 oberon_new_intrinsic(ctx
, "ABS", oberon_make_abs_call
, NULL
);
4095 oberon_new_intrinsic(ctx
, "MIN", oberon_make_min_call
, NULL
);
4096 oberon_new_intrinsic(ctx
, "MAX", oberon_make_max_call
, NULL
);
4097 oberon_new_intrinsic(ctx
, "SIZE", oberon_make_size_call
, NULL
);
4100 oberon_new_intrinsic(ctx
, "NEW", NULL
, oberon_make_new_call
);
4106 oberon_destroy_context(oberon_context_t
* ctx
)
4108 oberon_generator_destroy_context(ctx
);
4113 oberon_compile_module(oberon_context_t
* ctx
, const char * newcode
)
4115 const char * code
= ctx
-> code
;
4116 int code_index
= ctx
-> code_index
;
4118 int token
= ctx
-> token
;
4119 char * string
= ctx
-> string
;
4120 int integer
= ctx
-> integer
;
4121 int real
= ctx
-> real
;
4122 bool longmode
= ctx
-> longmode
;
4123 oberon_scope_t
* decl
= ctx
-> decl
;
4124 oberon_module_t
* mod
= ctx
-> mod
;
4126 oberon_scope_t
* module_scope
;
4127 module_scope
= oberon_open_scope(ctx
);
4129 oberon_module_t
* module
;
4130 module
= calloc(1, sizeof *module
);
4131 module
-> decl
= module_scope
;
4132 module
-> next
= ctx
-> module_list
;
4134 ctx
-> mod
= module
;
4135 ctx
-> module_list
= module
;
4137 oberon_init_scaner(ctx
, newcode
);
4138 oberon_parse_module(ctx
);
4140 module
-> ready
= 1;
4143 ctx
-> code_index
= code_index
;
4145 ctx
-> token
= token
;
4146 ctx
-> string
= string
;
4147 ctx
-> integer
= integer
;
4149 ctx
-> longmode
= longmode
;