11 %token STRUCT END METHOD VAR IF THEN ELSE WHILE DO RETURN NOT OR THIS IDENT NUM ASSIGN
14 @i xx = @Statement.sin@;
18 @i @Statement.sout@ = @Statement.sin@;
20 *> xxputsin(@Statement.sout@,)
21 * geht nicht, weil verschachtelte macros deaktiviert sind */
27 @attributes { char *name; } IDENT
28 @attributes { long val; } NUM
29 @attributes { struct symbol *f; } FeldID Parms Structdef Program
30 @attributes { struct symbol *s; } Methoddef Statseq Exprs
31 @attributes { struct symbol *s; struct treenode *node; } Lexpr Expr Minusterm Multerm Orterm Term Feld
32 @attributes { struct symbol *sin; struct symbol *sout; struct treenode *node; } Statement
34 @traversal @postorder c
35 @traversal @postorder gen
41 @i @Program.f@ = tab_new();
42 @gen @revorder(1) printf("\t.text\n");
49 @i @Methoddef.s@ = @Program.0.f@;
50 @i @Program.1.f@ = @Program.0.f@;
53 | Structdef ';' Program
55 @i @Program.1.f@ = tab_merge(@Program.0.f@, @Structdef.f@, 1);
61 METHOD IDENT '(' Parms ')' Statseq END
63 @i @Statseq.s@ = tab_merge(@Methoddef.s@, @Parms.f@, 0);
64 @gen @revorder(1) func_header(@IDENT.name@);
71 @i @Structdef.f@ = @FeldID.f@;
76 /* lokale Vars werden in Statement in die tabelle eingefuegt */
79 @i @Parms.0.f@ = tab_add_symbol(@Parms.1.f@, @IDENT.name@, S_PARM, 1);
84 @i @Parms.f@ = tab_new();
91 @i @FeldID.0.f@ = tab_add_symbol(@FeldID.1.f@, @IDENT.name@, S_FIELD, 1);
96 @i @FeldID.f@ = tab_new();
101 Statement ';' Statseq
103 @i @Statement.sin@ = @Statseq.0.s@;
104 @i @Statseq.1.s@ = @Statement.sout@;
105 @gen burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
117 @i @Statement.node@ = TREENULL;
120 | VAR IDENT ASSIGN Expr
122 /* tab_clone ist hier noetig, vgl. folgendes statement
123 * > var x := x - 1; */
124 @i @Statement.sout@ = tab_add_symbol(tab_clone(@Statement.sin@), @IDENT.name@, S_VAR, 1);
126 @i @Statement.node@ = TREENULL;
133 @i @Statement.node@ = TREENULL;
136 | IF Expr THEN Statseq END
140 xxputsin(@Statseq.s@,)
141 @i @Statement.node@ = TREENULL;
144 | IF Expr THEN Statseq ELSE Statseq END
148 xxputsin(@Statseq.0.s@,)
149 xxputsin(@Statseq.1.s@,)
150 @i @Statement.node@ = TREENULL;
153 | WHILE Expr DO Statseq END
157 xxputsin(@Statseq.s@,)
158 @i @Statement.node@ = TREENULL;
165 @i @Statement.node@ = new_node(O_RETURN, @Expr.node@, TREENULL);
172 @i @Lexpr.node@ = TREENULL;
173 @c check(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM);
181 @c check(@Feld.s@, @IDENT.name@, S_FIELD);
182 @i @Feld.node@ = TREENULL;
189 @i @Expr.node@ = TREENULL;
194 @i @Expr.node@ = TREENULL;
199 @i @Expr.node@ = TREENULL;
204 @i @Expr.node@ = TREENULL;
209 @i @Expr.node@ = TREENULL;
214 @i @Expr.node@ = TREENULL;
219 @i @Expr.node@ = TREENULL;
226 @i @Minusterm.node@ = TREENULL;
231 @i @Minusterm.node@ = TREENULL;
238 @i @Multerm.node@ = TREENULL;
243 @i @Multerm.node@ = TREENULL;
250 @i @Orterm.node@ = TREENULL;
254 @i @Orterm.node@ = TREENULL;
262 @i @Term.node@ = TREENULL;
267 @i @Term.node@ = TREENULL;
272 @i @Term.node@ = TREENULL;
277 @i @Term.node@ = TREENULL;
282 @c check(@Term.s@, @IDENT.name@, S_VAR|S_PARM);
283 @i @Term.node@ = TREENULL;
288 @i @Term.node@ = TREENULL;
291 | IDENT '(' Exprs ')'
293 @i @Term.node@ = TREENULL;
296 | Term '.' IDENT '(' Exprs ')'
298 @i @Term.node@ = TREENULL;
313 int yyerror(char *error_text)
315 fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
319 int main(int argc, char **argv)