%}
%start Input
-%token STRUCT END METHOD VAR IF THEN ELSE WHILE DO RETURN NOT OR THIS
-%token IDENT NUM ASSIGN
+%token STRUCT END METHOD VAR IF THEN ELSE WHILE DO RETURN NOT OR THIS IDENT NUM ASSIGN
-/* TODO: macro, see oxURM.ps @ p. 25 */
+@macro xxputsin(xx,)
+ @i xx = @Statement.sin@;
+@end
+
+@macro statinout()
+ @i @Statement.sout@ = @Statement.sin@;
+ /* das
+ *> xxputsin(@Statement.sout@,)
+ * geht nicht, weil verschachtelte macros deaktiviert sind */
+@end
@autoinh s
-/* f .. fields
- * s .. symbols */
@attributes { char *name; } IDENT
-@attributes { struct symbol *f; struct symbol *s; } Program
-@attributes { struct symbol *f; } Idents Structdef
-@attributes { struct symbol *p; } Parms
-@attributes { struct symbol *s; } Methoddef Statseq Lexpr Expr Minusterm Multerm Orterm
-Term Exprs
+@attributes { struct symbol *f; } FeldID Parms Structdef Program
+@attributes { struct symbol *s; } Methoddef Statseq Lexpr Expr Minusterm Multerm Orterm Term Exprs Feld
@attributes { struct symbol *sin; struct symbol *sout; } Statement
@traversal @postorder c
%%
-
Input:
Program
@{
- @i @Program.s@ = @Program.f@;
+ @i @Program.f@ = tab_new();
@}
;
Program:
Methoddef ';' Program
@{
- @i @Program.0.f@ = @Program.1.f@;
+ @i @Methoddef.s@ = @Program.0.f@;
+ @i @Program.1.f@ = @Program.0.f@;
@}
-
+
| Structdef ';' Program
@{
- @i @Program.0.f@ = tab_merge(@Structdef.f@, @Program.1.f@, 1);
+ @i @Program.1.f@ = tab_merge(@Program.0.f@, @Structdef.f@, 1);
@}
-
|
- @{
- @i @Program.0.f@ = new_tab();
- @}
-
;
Methoddef:
METHOD IDENT '(' Parms ')' Statseq END
@{
- @i @Statseq.s@ = tab_merge(@Methoddef.s@, @Parms.p@, 0);
+ @i @Statseq.s@ = tab_merge(@Methoddef.s@, @Parms.f@, 0);
@}
-
;
Structdef:
- STRUCT Idents END
+ STRUCT FeldID END
@{
- @i @Structdef.f@ = @Idents.f@;
+ @i @Structdef.f@ = @FeldID.f@;
@}
-
;
Parms:
/* lokale Vars werden in Statement in die tabelle eingefuegt */
IDENT Parms
@{
- @i @Parms.0.p@ = tab_add_symbol(@Parms.1.p@, @IDENT.name@, S_VAR, 1);
+ @i @Parms.0.f@ = tab_add_symbol(@Parms.1.f@, @IDENT.name@, S_VAR, 1);
@}
|
@{
- @i @Parms.p@ = new_tab();
+ @i @Parms.f@ = tab_new();
@}
-
;
-Idents:
- IDENT Idents
+FeldID:
+ IDENT FeldID
@{
- @i @Idents.0.f@ = tab_add_symbol(@Idents.1.f@, @IDENT.name@, S_FIELD, 1);
+ @i @FeldID.0.f@ = tab_add_symbol(@FeldID.1.f@, @IDENT.name@, S_FIELD, 1);
@}
|
@{
- @i @Idents.f@ = new_tab();
+ @i @FeldID.f@ = tab_new();
@}
-
;
Statseq:
@}
|
-
;
Statement:
Lexpr ASSIGN Expr
@{
- @i @Statement.sout@ = @Statement.sin@;
- @i @Lexpr.s@ = @Statement.sin@;
- @i @Expr.s@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Lexpr.s@,)
+ xxputsin(@Expr.s@,)
@}
| VAR IDENT ASSIGN Expr
@{
- @i @Statement.sout@ = tab_add_symbol(clone_tab(@Statement.sin@), @IDENT.name@, S_VAR, 0);
- @i @Expr.s@ = @Statement.sin@;
+ /* tab_clone ist hier noetig, vgl. folgendes statement
+ * > var x := x - 1; */
+ @i @Statement.sout@ = tab_add_symbol(tab_clone(@Statement.sin@), @IDENT.name@, S_VAR, 1);
+ xxputsin(@Expr.s@,)
@}
| Expr
@{
- @i @Expr.s@ = @Statement.sin@;
- @i @Statement.sout@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Expr.s@,)
@}
| IF Expr THEN Statseq END
@{
- @i @Expr.s@ = @Statement.sin@;
- @i @Statseq.s@ = @Statement.sin@;
- @i @Statement.sout@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Expr.s@,)
+ xxputsin(@Statseq.s@,)
@}
| IF Expr THEN Statseq ELSE Statseq END
@{
- @i @Expr.s@ = @Statement.sin@;
- @i @Statseq.0.s@ = @Statement.sin@;
- @i @Statseq.1.s@ = @Statement.sin@;
- @i @Statement.sout@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Expr.s@,)
+ xxputsin(@Statseq.0.s@,)
+ xxputsin(@Statseq.1.s@,)
@}
| WHILE Expr DO Statseq END
@{
- @i @Expr.s@ = @Statement.sin@;
- @i @Statseq.s@ = @Statement.sin@;
- @i @Statement.sout@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Expr.s@,)
+ xxputsin(@Statseq.s@,)
@}
| RETURN Expr
@{
- @i @Expr.s@ = @Statement.sin@;
- @i @Statement.sout@ = @Statement.sin@;
+ statinout()
+ xxputsin(@Expr.s@,)
@}
-
;
Lexpr:
IDENT
@{
- @c check_variable(@Lexpr.s@, @IDENT.name@);
+ @c check(@Lexpr.s@, @IDENT.name@, S_VAR);
@}
- | Term '.' IDENT
+ | Feld
+ ;
+
+Feld: Term '.' IDENT
@{
- @c check_variable(@Lexpr.s@, @IDENT.name@);
+ @c check(@Feld.s@, @IDENT.name@, S_FIELD);
@}
-
;
Expr:
| OR Term
;
-
Term:
'(' Expr ')'
| NUM
| THIS
| IDENT
@{
- @c check_variable(@Term.s@, @IDENT.name@);
- @}
-
- | Term '.' IDENT
- @{
- @c check_variable(@Term.s@, @IDENT.name@);
+ @c check(@Term.s@, @IDENT.name@, S_VAR);
@}
+ | Feld
| IDENT '(' Exprs ')'
- @{
- @c check_variable(@Term.s@, @IDENT.name@);
- @}
-
| Term '.' IDENT '(' Exprs ')'
- @{
- @c check_variable(@Term.s@, @IDENT.name@);
- @}
-
;
-/* beachte dass hier auch "nichts" vorkommen kann
- * sonst waer ein aufruf der art 'f()' nicht
- * moeglich (leere parameterliste) */
Exprs:
+ Expr ',' Exprs
| Expr
- | Exprs ',' Expr
+ |
;
-
%%
extern int yylex();
int yyerror(char *error_text)
{
- fprintf(stderr,"Line %i: %s\n", yylineno, error_text);
+ fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
exit(2);
}