gesamt/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         #define MAX(A,B) (A > B ? A : B)
  10 %}
  11
  12 %start Input
  13 %token STRUCT END METHOD VAR IF THEN ELSE WHILE DO RETURN NOT OR THIS IDENT NUM ASSIGN
  14
  15 @macro xxputsin(xx,)
  16         @i xx = @Statement.sin@;
  17 @end
  18
  19 @macro statinout()
  20         @i @Statement.sout@ = @Statement.sin@;
  21         /* das
  22          *> xxputsin(@Statement.sout@,)
  23          * geht nicht, weil verschachtelte macros deaktiviert sind */
  24 @end
  25
  26 @macro lblcountinout()
  27         @i @Statement.lblcnt_out@ = @Statement.lblcnt_in@;
  28 @end
  29
  30 @macro varsinout()
  31         @i @Statement.vars_out@ = @Statement.vars_in@;
  32 @end
  33
  34 /* beschreibung der attribute
  35  * s: symboltabelle
  36  * f: symboltabelle fuer quirks mit structur und parameter
  37  * gparamges: anzahl der parameter in einer methode
  38  * parms: parametercounter
  39  * node: baum fuer iburg
  40  * sin: symboltabelle fuer statement ("eingabe")
  41  * sout: symboltabelle die aus einem statement wieder rauskommt ("ausgabe")
  42  */
  43 @autoinh s gparamges vars_in
  44 @autosyn node imm call
  45
  46 @attributes { char *name; } IDENT
  47 @attributes { long val; } NUM
  48 @attributes { struct symbol *f; int paramges; int parms; } Parms
  49 @attributes { struct symbol *f; } Program Structdef;
  50 @attributes { struct symbol *f; int offsetcount; } FeldID
  51 @attributes { struct symbol *s; } Methoddef
  52 @attributes { struct symbol *s; int gparamges; int vars_in; int cnt; int paramcount; struct treenode *node; } Exprs
  53 @attributes { struct symbol *s; int gparamges; int lblcnt_in; int lblcnt_out; int vars_in; int vars_out; int call; } Statseq
  54 @attributes { struct symbol *s; int gparamges; int lblcnt_in; int lblcnt_out; int reallblcnt; int vars_in; int vars_out; int call; } Elsestat
  55 @attributes { struct symbol *s; int gparamges; int vars_in; struct treenode *node; short imm; int call; } Expr Minusterm Multerm Orterm Feld Term
  56 @attributes { struct symbol *s; int gparamges; int vars_in; struct treenode *node; } Lexpr
  57 @attributes { struct symbol *sin; int gparamges; struct symbol *sout; struct treenode *node; int vars_in; int vars_out; int lblcnt_in; int lblcnt_out; int call; } Statement
  58
  59 @traversal @postorder c
  60 @traversal @preorder reg
  61 @traversal @preorder gen
  62
  63 %%
  64 Input:
  65           Program
  66           @{
  67             @i @Program.f@ = tab_new();
  68             @gen printf("\t.text\n");
  69           @}
  70         ;
  71
  72 Program:
  73           Methoddef ';' Program
  74           @{
  75             @i @Methoddef.s@ = @Program.0.f@;
  76             @i @Program.1.f@ = @Program.0.f@;
  77           @}
  78
  79         | Structdef ';' Program
  80           @{
  81             @i @Program.1.f@ = tab_merge(@Program.0.f@, @Structdef.f@, 1);
  82           @}
  83         |
  84         ;
  85
  86 Methoddef:
  87           METHOD IDENT '(' Parms ')' Statseq END
  88           @{
  89             @i @Parms.parms@ = 1;
  90             @i @Statseq.s@ = tab_merge(@Methoddef.s@, @Parms.f@, 0);
  91                 @i @Statseq.vars_in@ = 0;
  92                 @i @Statseq.gparamges@ = @Parms.paramges@;
  93                 @i @Statseq.lblcnt_in@ = 0;
  94             @gen func_header(@IDENT.name@, @Statseq.vars_out@, @Parms.paramges@, @Statseq.call@);
  95           @}
  96         ;
  97
  98 Structdef:
  99           STRUCT FeldID END
 100           @{
 101             @i @Structdef.f@ = @FeldID.f@;
 102                 @i @FeldID.offsetcount@ = 0;
 103           @}
 104         ;
 105
 106 Parms:
 107           /* lokale Vars werden in Statement in die tabelle eingefuegt */
 108           IDENT Parms
 109           @{
 110             @i @Parms.1.parms@ = @Parms.0.parms@ + 1;
 111                 @i @Parms.0.paramges@ = @Parms.1.paramges@;
 112             @i @Parms.0.f@ = tab_add_symbol(@Parms.1.f@, @IDENT.name@, S_PARM, 1, @Parms.parms@, -1);
 113           @}
 114
 115         |
 116           @{
 117             @i @Parms.f@ = tab_new();
 118                 @i @Parms.paramges@ = @Parms.parms@;
 119           @}
 120         ;
 121
 122 FeldID:
 123           IDENT FeldID
 124           @{
 125             @i @FeldID.1.offsetcount@ = @FeldID.0.offsetcount@ + 1;
 126             @i @FeldID.0.f@ = tab_add_symbol(@FeldID.1.f@, @IDENT.name@, S_FIELD, 1, -1, @FeldID.0.offsetcount@);
 127           @}
 128
 129         |
 130           @{
 131             @i @FeldID.f@ = tab_new();
 132           @}
 133         ;
 134
 135 Statseq:
 136           Statement ';' Statseq
 137           @{
 138                 @i @Statement.sin@ = @Statseq.0.s@;
 139                 @i @Statement.lblcnt_in@ = @Statseq.0.lblcnt_in@;
 140
 141                 @i @Statseq.1.s@ = @Statement.sout@;
 142                 @i @Statseq.1.lblcnt_in@ = @Statement.lblcnt_out@;
 143                 @i @Statseq.1.gparamges@ = @Statseq.0.gparamges@;
 144
 145                 @i @Statement.vars_in@ = @Statseq.0.vars_in@;
 146                 @i @Statseq.1.vars_in@ = @Statement.vars_out@;
 147
 148                 @i @Statseq.0.lblcnt_out@ = @Statseq.1.lblcnt_out@;
 149                 @i @Statseq.0.vars_out@ = @Statseq.1.vars_out@;
 150
 151                 @i @Statseq.0.call@ = @Statement.call@ || @Statseq.1.call@;
 152           @}
 153
 154         |
 155           @{
 156                 @i @Statseq.0.lblcnt_out@ = @Statseq.0.lblcnt_in@;
 157                 @i @Statseq.0.vars_out@ = @Statseq.0.vars_in@;
 158                 @i @Statseq.0.call@ = 0;
 159           @}
 160         ;
 161
 162 Statement:
 163           Lexpr ASSIGN Expr
 164           @{
 165                 statinout()
 166                 lblcountinout()
 167                 varsinout()
 168                 xxputsin(@Lexpr.s@,)
 169                 xxputsin(@Expr.s@,)
 170             @i @Statement.node@ = new_node(O_ASSIGN, @Expr.node@, @Lexpr.node@);
 171                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 172                 @reg @Lexpr.node@->reg = next_reg(@Expr.node@->reg, @Expr.gparamges@);
 173
 174                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 175           @}
 176
 177         | VAR IDENT ASSIGN Expr
 178           @{
 179                 /* tab_clone ist hier noetig, vgl. folgendes statement
 180                  * > var x := x - 1; */
 181                 @i @Statement.sout@ = tab_add_symbol(tab_clone(@Statement.sin@), @IDENT.name@, S_VAR, 1, 6 - @Statement.vars_in@, -1);
 182                 lblcountinout()
 183
 184                 @i @Statement.vars_out@ = @Statement.vars_in@ + 1;
 185
 186                 xxputsin(@Expr.s@,)
 187
 188                 @i @Statement.node@ = new_node(O_ASSIGN, @Expr.node@, new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, 6 - @Statement.vars_in@));
 189                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 190
 191                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 192           @}
 193
 194         | Expr
 195           @{
 196                 statinout()
 197                 varsinout()
 198                 lblcountinout()
 199                 xxputsin(@Expr.s@,)
 200                 @i @Statement.node@ = new_node(O_EXPR, @Expr.node@, TREENULL);
 201                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 202
 203                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 204           @}
 205
 206         | IF Expr THEN Statseq END
 207           @{
 208                 statinout()
 209                 @i @Statseq.lblcnt_in@ =  @Statement.lblcnt_in@ + 1;
 210                 @i @Statement.lblcnt_out@ = @Statseq.lblcnt_out@;
 211
 212                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 213                 @i @Statement.vars_out@ = @Statseq.vars_out@;
 214
 215                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@;
 216
 217                 xxputsin(@Expr.s@,)
 218                 xxputsin(@Statseq.s@,)
 219
 220                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 221
 222                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 223                 @gen {
 224                         printf(".%s_ifstart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 225                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 226                         /* TODO: kann ich mir das test wirklich wegan and davor sparen? */
 227                         printf("\tjz .%s_ifend_%d\n", get_func_name(), @Statement.lblcnt_in@);
 228                 }
 229                 @gen @revorder(1) printf(".%s_ifend_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 230           @}
 231
 232         | IF Expr THEN Statseq Elsestat END
 233           @{
 234                 statinout()
 235                 @i @Statseq.0.lblcnt_in@ = @Statement.lblcnt_in@ + 1;
 236                 @i @Elsestat.lblcnt_in@ = @Statseq.lblcnt_out@;
 237                 @i @Statement.lblcnt_out@ = @Elsestat.lblcnt_out@;
 238
 239                 /* im Elsestat muss noch ein label numeriert werden */
 240                 @i @Elsestat.reallblcnt@ = @Statement.lblcnt_in@;
 241
 242                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 243                 @i @Elsestat.vars_in@ = @Statement.vars_in@;
 244                 @i @Statement.vars_out@ = MAX(@Statseq.vars_out@, @Elsestat.vars_out@);
 245
 246                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@ || @Elsestat.call@;
 247
 248                 xxputsin(@Expr.s@,)
 249                 xxputsin(@Statseq.0.s@,)
 250                 xxputsin(@Elsestat.s@,)
 251
 252                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 253
 254                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 255                 @gen {
 256                         printf(".%s_ifstart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 257                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 258                         /* TODO: kann ich mir das test wirklich wegan and davor sparen? */
 259                         printf("\tjz .%s_ifelse_%d\n", get_func_name(), @Statement.lblcnt_in@);
 260                 }
 261                 @gen @revorder(1) printf(".%s_ifend_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 262           @}
 263
 264         | WHILE Expr DO Statseq END
 265           @{
 266                 statinout()
 267                 @i @Statseq.lblcnt_in@ =  @Statement.lblcnt_in@ + 1;
 268                 @i @Statement.lblcnt_out@ = @Statseq.lblcnt_out@;
 269
 270                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 271                 @i @Statement.vars_out@ = @Statseq.vars_out@;
 272
 273                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@;
 274
 275                 xxputsin(@Expr.s@,)
 276                 xxputsin(@Statseq.s@,)
 277
 278                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 279
 280                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 281                 @gen {
 282                         printf(".%s_whilestart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 283                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 284                         /* TODO: kann ich mir das test wirklich wegan and davor sparen? */
 285                         printf("\tjz .%s_whileend_%d\n", get_func_name(), @Statement.lblcnt_in@);
 286                 }
 287                 @gen @revorder(1) printf("\tjmp .%s_whilestart_%d\n.%s_whileend_%d:\n", get_func_name(), @Statement.lblcnt_in@, get_func_name(), @Statement.lblcnt_in@);
 288           @}
 289
 290         | RETURN Expr
 291           @{
 292                 statinout()
 293                 lblcountinout()
 294                 varsinout()
 295                 xxputsin(@Expr.s@,)
 296
 297                 @i @Statement.node@ = new_node(O_RET, @Expr.node@, TREENULL);
 298                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 299
 300                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1); func_footer();
 301           @}
 302         ;
 303
 304 Elsestat:
 305           ELSE Statseq
 306           @{
 307                 @i @Statseq.lblcnt_in@ =  @Elsestat.lblcnt_in@;
 308                 @i @Elsestat.lblcnt_out@ =  @Statseq.lblcnt_out@;
 309
 310                 @i @Statseq.vars_in@ = @Elsestat.vars_in@;
 311                 @i @Elsestat.vars_out@ = @Statseq.vars_out@;
 312
 313                 @gen printf("\tjmp .%s_ifend_%d\n.%s_ifelse_%d:\n", get_func_name(), @Elsestat.reallblcnt@, get_func_name(), @Elsestat.reallblcnt@);
 314           @}
 315
 316 Lexpr:
 317           IDENT
 318           @{
 319             @c check(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM);
 320
 321                 /* TODO: selbe Code wie bei Term/IDENT -- schoener machen! */
 322             @i {
 323                         @Lexpr.node@ = TREENULL;
 324                         if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 325                                 /* es handelt sich um ein feldzugriff auf this */
 326                                 @Lexpr.node@ = new_field(@IDENT.name@, new_param(O_ID, strdup("this"), TREENULL, TREENULL, 0), TREENULL, tab_lookup(@Lexpr.s@, @IDENT.name@, S_FIELD) == SYMNULL ? -1 : tab_lookup(@Lexpr.s@, @IDENT.name@, S_FIELD)->soffset);
 327                         } else { /* param oder var */
 328                                 int tmp = tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL ? -1 : tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM)->param_index;
 329                                 @Lexpr.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 330                         }
 331                 }
 332
 333                 @reg if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 334                         /* TODO: kein schoener hack? */
 335                         @Lexpr.node@->kids[0]->reg = @Lexpr.node@->reg;
 336                 }
 337           @}
 338
 339         | Feld
 340         ;
 341
 342 Feld: Term '.' IDENT
 343           @{
 344             @c check(@Feld.s@, @IDENT.name@, S_FIELD);
 345             @i @Feld.node@ = new_field(@IDENT.name@, @Term.node@, TREENULL, tab_lookup(@Feld.s@, @IDENT.name@, S_FIELD) == SYMNULL ? -1 : tab_lookup(@Feld.s@, @IDENT.name@, S_FIELD)->soffset);
 346
 347                 @reg @Term.node@->reg = next_reg(@Feld.node@->reg, @Term.gparamges@);
 348           @}
 349         ;
 350
 351 Expr:
 352           Term
 353           @{
 354             @reg @Term.node@->reg = @Expr.node@->reg;
 355           @}
 356
 357         | NOT Term
 358           @{
 359                 @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.node@, new_node(O_NULL, TREENULL, TREENULL)), TREENULL);
 360
 361                 @reg @Term.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 362           @}
 363
 364         | Term Minusterm
 365           @{
 366             @i @Expr.node@ = new_node(O_SUB, @Term.node@, @Minusterm.node@);
 367                 @i @Expr.imm@ = @Term.imm@ && @Minusterm.imm@;
 368                 @i @Expr.call@ = @Term.call@ || @Minusterm.call@;
 369
 370                 @reg {
 371                         if(!(@Expr.node@->kids[0] == TREENULL && @Expr.node@->kids[1] == TREENULL)) {
 372                                 @Term.node@->reg = @Expr.node@->reg;
 373                                 if(@Minusterm.imm@) {
 374                                         @Minusterm.node@->reg = @Expr.node@->reg;
 375                                 } else {
 376                                         @Minusterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 377                                 }
 378                         }
 379                 }
 380           @}
 381
 382         | Term Multerm
 383           @{
 384             @i @Expr.node@ = new_node(O_MUL, @Term.node@, @Multerm.node@);
 385                 @i @Expr.imm@ = @Term.imm@ && @Multerm.imm@;
 386                 @i @Expr.call@ = @Term.call@ || @Multerm.call@;
 387
 388                 @reg {
 389                         @Term.node@->reg = @Expr.node@->reg;
 390                         if(@Term.imm@) {
 391                                 @Multerm.node@->reg = @Expr.node@->reg;
 392                         } else {
 393                                 @Multerm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 394                         }
 395                 }
 396           @}
 397
 398         | Term Orterm
 399           @{
 400             @i @Expr.node@ = new_node(O_OR, @Term.node@, @Orterm.node@);
 401                 @i @Expr.imm@ = @Term.imm@ && @Orterm.imm@;
 402                 @i @Expr.call@ = @Term.call@ || @Orterm.call@;
 403
 404                 @reg {
 405                         @Term.node@->reg = @Expr.node@->reg;
 406                         @Orterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 407                 }
 408           @}
 409
 410         | Term '<' Term
 411           @{
 412             @i @Expr.node@ = new_node(O_BOOL, new_node(O_LESS, @Term.0.node@, @Term.1.node@), TREENULL);
 413                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 414                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 415
 416                 @reg {
 417                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 418                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 419                 }
 420           @}
 421
 422         | Term '=' Term
 423           @{
 424             @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.0.node@, @Term.1.node@), TREENULL);
 425                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 426                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 427
 428                 @reg {
 429                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 430                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 431                 }
 432           @}
 433         ;
 434
 435 Minusterm:
 436           '-' Term Minusterm
 437           @{
 438             @i @Minusterm.node@ = new_node(O_ADD, @Minusterm.1.node@, @Term.node@);
 439                 @i @Minusterm.0.imm@ = @Term.imm@ && @Minusterm.1.imm@;
 440                 @i @Minusterm.0.call@ = @Term.call@ || @Minusterm.1.call@;
 441
 442             @reg {
 443                         @Minusterm.1.node@->reg = @Minusterm.node@->reg;
 444                         if(@Minusterm.1.imm@) {
 445                                 @Term.node@->reg = @Minusterm.node@->reg;
 446                         } else {
 447                                 @Term.node@->reg = next_reg(@Minusterm.1.node@->reg, @Minusterm.gparamges@);
 448                         }
 449                 }
 450           @}
 451
 452         | '-' Term
 453           @{
 454             @reg @Term.node@->reg = @Minusterm.node@->reg;
 455           @}
 456         ;
 457
 458 Multerm:
 459           '*' Term Multerm
 460           @{
 461             @i @Multerm.node@ = new_node(O_MUL, @Multerm.1.node@, @Term.node@);
 462                 @i @Multerm.0.imm@ = @Term.imm@ && @Multerm.1.imm@;
 463                 @i @Multerm.0.call@ = @Term.call@ || @Multerm.1.call@;
 464
 465             @reg {
 466                         @Multerm.1.node@->reg = @Multerm.node@->reg;
 467                         if(@Multerm.1.imm@) {
 468                                 @Term.node@->reg = @Multerm.node@->reg;
 469                         } else {
 470                                 @Term.node@->reg = next_reg(@Multerm.1.node@->reg, @Multerm.gparamges@);
 471                         }
 472                 }
 473           @}
 474
 475         | '*' Term
 476           @{
 477             @reg @Term.node@->reg = @Multerm.node@->reg;
 478           @}
 479         ;
 480
 481 Orterm:
 482           OR Term Orterm
 483           @{
 484             @i @Orterm.node@ = new_node(O_OR, @Orterm.1.node@, @Term.node@);
 485                 @i @Orterm.0.imm@ = @Term.imm@ && @Orterm.1.imm@;
 486                 @i @Orterm.0.call@ = @Term.call@ || @Orterm.1.call@;
 487
 488             @reg {
 489                         @Orterm.1.node@->reg = @Orterm.node@->reg;
 490                         if(@Orterm.1.imm@) {
 491                                 @Term.node@->reg = @Orterm.node@->reg;
 492                         } else {
 493                                 @Term.node@->reg = next_reg(@Orterm.1.node@->reg, @Orterm.gparamges@);
 494                         }
 495                 }
 496           @}
 497         | OR Term
 498           @{
 499             @reg @Term.node@->reg = @Orterm.node@->reg;
 500           @}
 501
 502         ;
 503
 504 Term:
 505           '(' Expr ')'
 506           @{
 507             @i @Term.node@ = @Expr.node@;
 508           @}
 509
 510         | NUM
 511           @{
 512             @i @Term.node@ = new_number(@NUM.val@);
 513                 @i @Term.imm@ = 1;
 514                 @i @Term.call@ = 0;
 515           @}
 516
 517         | '-' NUM
 518           @{
 519             @i @Term.node@ = new_number(-1 * (@NUM.val@));
 520                 @i @Term.imm@ = 1;
 521                 @i @Term.call@ = 0;
 522           @}
 523
 524         | THIS
 525           @{
 526             @i @Term.node@ = new_param(O_ID, strdup("this"), TREENULL, TREENULL, 0);
 527                 @i @Term.imm@ = 0;
 528                 @i @Term.call@ = 0;
 529           @}
 530
 531         | IDENT
 532           @{
 533             @c check(@Term.s@, @IDENT.name@, S_VAR|S_PARM);
 534
 535                 @i @Term.imm@ = 0;
 536                 @i @Term.call@ = 0;
 537             @i {
 538                         @Term.node@ = TREENULL;
 539                         if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 540                                 /* es handelt sich um ein feldzugriff auf this */
 541                                 @Term.node@ = new_field(@IDENT.name@, new_param(O_ID, strdup("this"), TREENULL, TREENULL, 0), TREENULL, tab_lookup(@Term.s@, @IDENT.name@, S_FIELD) == SYMNULL ? -1 : tab_lookup(@Term.s@, @IDENT.name@, S_FIELD)->soffset);
 542                         } else { /* param oder var */
 543                                 int tmp = tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL ? -1 : tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM)->param_index;
 544                                 @Term.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 545                         }
 546                 }
 547
 548                 @reg if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 549                         /* TODO: kein schoener hack? */
 550                         @Term.node@->kids[0]->reg = @Term.node@->reg;
 551                 }
 552           @}
 553
 554         | Feld
 555           @{
 556             @i @Term.node@ = @Feld.node@;
 557                 @i @Term.imm@ = 0;
 558           @}
 559
 560         | IDENT '(' Exprs ')'
 561           @{
 562             @i {
 563                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, new_nothing(), 0) /*this*/,
 564                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 565                         @Term.node@->soffset = @Exprs.paramcount@;
 566                 }
 567                 @i @Exprs.cnt@ = 1;
 568                 @i @Term.imm@ = 0;
 569                 @i @Term.call@ = 1;
 570                 @reg @Exprs.node@->reg = @Term.node@->reg;
 571           @}
 572
 573         | Term '.' IDENT '(' Exprs ')'
 574           @{
 575             @i {
 576                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, @Term.1.node@, 0) /*this*/,
 577                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 578                         @Term.node@->soffset = @Exprs.paramcount@;
 579                 }
 580                 @i @Exprs.cnt@ = 1;
 581                 @i @Term.imm@ = 0;
 582                 @i @Term.call@ = 1;
 583                 @reg @Exprs.node@->reg = @Term.1.node@->reg = @Term.node@->kids[0]->reg = @Term.node@->reg;
 584           @}
 585
 586         ;
 587
 588 Exprs:
 589           Expr ',' Exprs
 590           @{
 591                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, @Exprs.1.node@, @Exprs.0.cnt@);
 592                 @i @Exprs.0.paramcount@ = @Exprs.1.paramcount@;
 593                 @i @Exprs.1.cnt@ = @Exprs.0.cnt@ + 1;
 594                 @reg @Expr.node@->reg = @Exprs.0.node@->reg; @Exprs.1.node@->reg = next_reg(@Exprs.0.node@->reg, @Exprs.gparamges@);
 595           @}
 596         | Expr
 597           @{
 598                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, new_nothing(), @Exprs.cnt@);
 599                 @i @Exprs.paramcount@ = @Exprs.cnt@ + 1;
 600                 @reg @Expr.node@->reg = @Exprs.0.node@->reg;
 601           @}
 602         |
 603           @{
 604                 @i @Exprs.0.node@ = new_nothing();
 605                 @i @Exprs.paramcount@ = @Exprs.cnt@;
 606           @}
 607         ;
 608 %%
 609
 610 extern int yylex();
 611 extern int yylineno;
 612
 613 int yyerror(char *error_text)
 614 {
 615         fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
 616         exit(2);
 617 }
 618
 619 int main(int argc, char **argv)
 620 {
 621         #if 0
 622         yydebug=1;
 623         #endif
 624         yyparse();
 625         return 0;
 626 }
 627