codea/parser.y

   1 %{
   2         #include <stdio.h>
   3         #include <stdlib.h>
   4         #include <string.h>
   5         #include "symtable.h"
   6         #include "chelper.h"
   7         #include "tree.h"
   8 %}
   9
  10 %start Input
  11 %token STRUCT END METHOD VAR IF THEN ELSE WHILE DO RETURN NOT OR THIS IDENT NUM ASSIGN
  12
  13 @macro xxputsin(xx,)
  14         @i xx = @Statement.sin@;
  15 @end
  16
  17 @macro statinout()
  18         @i @Statement.sout@ = @Statement.sin@;
  19         /* das
  20          *> xxputsin(@Statement.sout@,)
  21          * geht nicht, weil verschachtelte macros deaktiviert sind */
  22 @end
  23
  24 @autoinh s
  25 @autosyn node
  26
  27 @attributes { char *name; } IDENT
  28 @attributes { long val; } NUM
  29 @attributes { struct symbol *f; int parms; } Parms
  30 @attributes { struct symbol *f; } FeldID Structdef Program
  31 @attributes { struct symbol *s; } Methoddef Statseq Exprs
  32 @attributes { struct symbol *s; struct treenode *node; } Lexpr Expr Minusterm Multerm Orterm Term Feld
  33 @attributes { struct symbol *sin; struct symbol *sout; struct treenode *node; } Statement
  34
  35 @traversal @postorder c
  36 @traversal @preorder reg
  37 @traversal @postorder gen
  38
  39 %%
  40 Input:
  41           Program
  42           @{
  43             @i @Program.f@ = tab_new();
  44             @gen @revorder(1) printf("\t.text\n");
  45           @}
  46         ;
  47
  48 Program:
  49           Methoddef ';' Program
  50           @{
  51             @i @Methoddef.s@ = @Program.0.f@;
  52             @i @Program.1.f@ = @Program.0.f@;
  53           @}
  54
  55         | Structdef ';' Program
  56           @{
  57             @i @Program.1.f@ = tab_merge(@Program.0.f@, @Structdef.f@, 1);
  58           @}
  59         |
  60         ;
  61
  62 Methoddef:
  63           METHOD IDENT '(' Parms ')' Statseq END
  64           @{
  65             @i @Parms.parms@ = 1;
  66             @i @Statseq.s@ = tab_merge(@Methoddef.s@, @Parms.f@, 0);
  67             @gen @revorder(1) func_header(@IDENT.name@);
  68           @}
  69         ;
  70
  71 Structdef:
  72           STRUCT FeldID END
  73           @{
  74             @i @Structdef.f@ = @FeldID.f@;
  75           @}
  76         ;
  77
  78 Parms:
  79           /* lokale Vars werden in Statement in die tabelle eingefuegt */
  80           IDENT Parms
  81           @{
  82             @i @Parms.1.parms@ = @Parms.parms@ + 1;
  83             @i @Parms.0.f@ = tab_add_symbol(@Parms.1.f@, @IDENT.name@, S_PARM, 1, @Parms.parms@);
  84           @}
  85
  86         |
  87           @{
  88             @i @Parms.f@ = tab_new();
  89           @}
  90         ;
  91
  92 FeldID:
  93           IDENT FeldID
  94           @{
  95             @i @FeldID.0.f@ = tab_add_symbol(@FeldID.1.f@, @IDENT.name@, S_FIELD, 1, -1);
  96           @}
  97
  98         |
  99           @{
 100             @i @FeldID.f@ = tab_new();
 101           @}
 102         ;
 103
 104 Statseq:
 105           Statement ';' Statseq
 106           @{
 107                 @i @Statement.sin@ = @Statseq.0.s@;
 108                 @i @Statseq.1.s@ = @Statement.sout@;
 109                 @gen burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 110           @}
 111
 112         |
 113         ;
 114
 115 Statement:
 116           Lexpr ASSIGN Expr
 117           @{
 118                 statinout()
 119                 xxputsin(@Lexpr.s@,)
 120                 xxputsin(@Expr.s@,)
 121             @i @Statement.node@ = TREENULL;
 122           @}
 123
 124         | VAR IDENT ASSIGN Expr
 125           @{
 126                 /* tab_clone ist hier noetig, vgl. folgendes statement
 127                  * > var x := x - 1; */
 128                 @i @Statement.sout@ = tab_add_symbol(tab_clone(@Statement.sin@), @IDENT.name@, S_VAR, 1, -1);
 129                 xxputsin(@Expr.s@,)
 130             @i @Statement.node@ = TREENULL;
 131           @}
 132
 133         | Expr
 134           @{
 135                 statinout()
 136                 xxputsin(@Expr.s@,)
 137             @i @Statement.node@ = TREENULL;
 138           @}
 139
 140         | IF Expr THEN Statseq END
 141           @{
 142                 statinout()
 143                 xxputsin(@Expr.s@,)
 144                 xxputsin(@Statseq.s@,)
 145             @i @Statement.node@ = TREENULL;
 146           @}
 147
 148         | IF Expr THEN Statseq ELSE Statseq END
 149           @{
 150                 statinout()
 151                 xxputsin(@Expr.s@,)
 152                 xxputsin(@Statseq.0.s@,)
 153                 xxputsin(@Statseq.1.s@,)
 154             @i @Statement.node@ = TREENULL;
 155           @}
 156
 157         | WHILE Expr DO Statseq END
 158           @{
 159                 statinout()
 160                 xxputsin(@Expr.s@,)
 161                 xxputsin(@Statseq.s@,)
 162             @i @Statement.node@ = TREENULL;
 163           @}
 164
 165         | RETURN Expr
 166           @{
 167                 statinout()
 168                 xxputsin(@Expr.s@,)
 169                 @i @Statement.node@ = new_node(O_RET, @Expr.node@, TREENULL);
 170                 @reg @Statement.node@->reg = next_reg((char *)NULL, 0); @Expr.node@->reg = @Statement.node@->reg;
 171           @}
 172         ;
 173
 174 Lexpr:
 175           IDENT
 176           @{
 177             @i @Lexpr.node@ = TREENULL;
 178             @c check(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM);
 179           @}
 180
 181         | Feld
 182         ;
 183
 184 Feld: Term '.' IDENT
 185           @{
 186             @c check(@Feld.s@, @IDENT.name@, S_FIELD);
 187             @i @Feld.node@ = TREENULL;
 188                 @reg fprintf(stderr, "w00t8\n");
 189           @}
 190         ;
 191
 192 Expr:
 193           Term
 194           @{
 195             @reg @Term.node@->reg = @Expr.node@->reg;
 196           @}
 197
 198         | NOT Term
 199           @{
 200             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t2\n");
 201           @}
 202
 203         | Term Minusterm
 204           @{
 205             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t3\n");
 206           @}
 207
 208         | Term Multerm
 209           @{
 210             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t4\n");
 211           @}
 212
 213         | Term Orterm
 214           @{
 215             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t5\n");
 216           @}
 217
 218         | Term '<' Term
 219           @{
 220             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t6\n");
 221           @}
 222
 223         | Term '=' Term
 224           @{
 225             @i @Expr.node@ = TREENULL; fprintf(stderr, "w00t7\n");
 226           @}
 227         ;
 228
 229 Minusterm:
 230           '-' Term Minusterm
 231           @{
 232             @i @Minusterm.node@ = TREENULL;
 233             @reg fprintf(stderr, "minus1\n");
 234           @}
 235
 236         | '-' Term
 237           @{
 238             @i @Minusterm.node@ = TREENULL;
 239             @reg fprintf(stderr, "minus2\n");
 240           @}
 241         ;
 242
 243 Multerm:
 244           '*' Term Multerm
 245           @{
 246             @i @Multerm.node@ = TREENULL;
 247             @reg fprintf(stderr, "mul1\n");
 248           @}
 249
 250         | '*' Term
 251           @{
 252             @i @Multerm.node@ = TREENULL;
 253             @reg fprintf(stderr, "mul2\n");
 254           @}
 255         ;
 256
 257 Orterm:
 258           OR Term Orterm
 259           @{
 260             @i @Orterm.node@ = TREENULL;
 261             @reg fprintf(stderr, "or1\n");
 262           @}
 263         | OR Term
 264           @{
 265             @i @Orterm.node@ = TREENULL;
 266             @reg fprintf(stderr, "or2\n");
 267           @}
 268
 269         ;
 270
 271 Term:
 272           '(' Expr ')'
 273           @{
 274             @i @Term.node@ = TREENULL;
 275             @reg fprintf(stderr, "wtf1\n");
 276           @}
 277
 278         | NUM
 279           @{
 280             @i @Term.node@ = TREENULL;
 281             @reg fprintf(stderr, "wtf2\n");
 282           @}
 283
 284         | '-' NUM
 285           @{
 286             @i @Term.node@ = TREENULL;
 287             @reg fprintf(stderr, "wtf3\n");
 288           @}
 289
 290         | THIS
 291           @{
 292             @i @Term.node@ = new_node(O_ID, TREENULL, TREENULL); @Term.node@->param_index = 0;
 293             @reg fprintf(stderr, "wtf4\n");
 294           @}
 295
 296         | IDENT
 297           @{
 298             @c check(@Term.s@, @IDENT.name@, S_VAR|S_PARM);
 299             @i @Term.node@ = new_node(O_ID, TREENULL, TREENULL); {
 300                         struct symbol *tmp;
 301                         if((tmp = tab_lookup(@Term.s@, @IDENT.name@, S_PARM)) != TREENULL) {
 302                                 @Term.node@->param_index = tmp->param_index;
 303                         }
 304                 }
 305             @reg fprintf(stderr, "wtf5\n");
 306           @}
 307
 308         | Feld
 309           @{
 310             @i @Term.node@ = TREENULL;
 311             @reg fprintf(stderr, "wtf6\n");
 312           @}
 313
 314         | IDENT '(' Exprs ')'
 315           @{
 316             @i @Term.node@ = TREENULL;
 317             @reg fprintf(stderr, "wtf7\n");
 318           @}
 319
 320         | Term '.' IDENT '(' Exprs ')'
 321           @{
 322             @i @Term.node@ = TREENULL;
 323             @reg fprintf(stderr, "wtf8\n");
 324           @}
 325
 326         ;
 327
 328 Exprs:
 329           Expr ',' Exprs
 330         | Expr
 331         |
 332         ;
 333 %%
 334
 335 extern int yylex();
 336 extern int yylineno;
 337
 338 int yyerror(char *error_text)
 339 {
 340         fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
 341         exit(2);
 342 }
 343
 344 int main(int argc, char **argv)
 345 {
 346         #if 0
 347         yydebug=1;
 348         #endif
 349         yyparse();
 350         return 0;
 351 }
 352