gesamt_arm/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.section\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, @Statement.gparamges@ + @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, @Statement.gparamges@ + @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                         printf("\tbeq 0,.%s_ifend_%d\n", get_func_name(), @Statement.lblcnt_in@);
 227                 }
 228                 @gen @revorder(1) printf(".%s_ifend_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 229           @}
 230
 231         | IF Expr THEN Statseq Elsestat END
 232           @{
 233                 statinout()
 234                 @i @Statseq.0.lblcnt_in@ = @Statement.lblcnt_in@ + 1;
 235                 @i @Elsestat.lblcnt_in@ = @Statseq.lblcnt_out@;
 236                 @i @Statement.lblcnt_out@ = @Elsestat.lblcnt_out@;
 237
 238                 /* im Elsestat muss noch ein label numeriert werden */
 239                 @i @Elsestat.reallblcnt@ = @Statement.lblcnt_in@;
 240
 241                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 242                 @i @Elsestat.vars_in@ = @Statement.vars_in@;
 243                 @i @Statement.vars_out@ = MAX(@Statseq.vars_out@, @Elsestat.vars_out@);
 244
 245                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@ || @Elsestat.call@;
 246
 247                 xxputsin(@Expr.s@,)
 248                 xxputsin(@Statseq.0.s@,)
 249                 xxputsin(@Elsestat.s@,)
 250
 251                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 252
 253                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 254                 @gen {
 255                         printf(".%s_ifstart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 256                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 257                         printf("\tbeq 0,.%s_ifelse_%d\n", get_func_name(), @Statement.lblcnt_in@);
 258                 }
 259                 @gen @revorder(1) printf(".%s_ifend_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 260           @}
 261
 262         | WHILE Expr DO Statseq END
 263           @{
 264                 statinout()
 265                 @i @Statseq.lblcnt_in@ =  @Statement.lblcnt_in@ + 1;
 266                 @i @Statement.lblcnt_out@ = @Statseq.lblcnt_out@;
 267
 268                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 269                 @i @Statement.vars_out@ = @Statseq.vars_out@;
 270
 271                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@;
 272
 273                 xxputsin(@Expr.s@,)
 274                 xxputsin(@Statseq.s@,)
 275
 276                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 277
 278                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 279                 @gen {
 280                         printf(".%s_whilestart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 281                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 282                         printf("\tbeq 0,.%s_whileend_%d\n", get_func_name(), @Statement.lblcnt_in@);
 283                 }
 284                 @gen @revorder(1) printf("\tb .%s_whilestart_%d\n.%s_whileend_%d:\n", get_func_name(), @Statement.lblcnt_in@, get_func_name(), @Statement.lblcnt_in@);
 285           @}
 286
 287         | RETURN Expr
 288           @{
 289                 statinout()
 290                 lblcountinout()
 291                 varsinout()
 292                 xxputsin(@Expr.s@,)
 293
 294                 @i @Statement.node@ = new_node(O_RET, @Expr.node@, TREENULL);
 295                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 296
 297                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1); func_footer();
 298           @}
 299         ;
 300
 301 Elsestat:
 302           ELSE Statseq
 303           @{
 304                 @i @Statseq.lblcnt_in@ =  @Elsestat.lblcnt_in@;
 305                 @i @Elsestat.lblcnt_out@ =  @Statseq.lblcnt_out@;
 306
 307                 @i @Statseq.vars_in@ = @Elsestat.vars_in@;
 308                 @i @Elsestat.vars_out@ = @Statseq.vars_out@;
 309
 310                 @gen printf("\tb .%s_ifend_%d\n.%s_ifelse_%d:\n", get_func_name(), @Elsestat.reallblcnt@, get_func_name(), @Elsestat.reallblcnt@);
 311           @}
 312
 313 Lexpr:
 314           IDENT
 315           @{
 316             @c check(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM);
 317
 318                 /* TODO: selbe Code wie bei Term/IDENT -- schoener machen! */
 319             @i {
 320                         @Lexpr.node@ = TREENULL;
 321                         if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 322                                 /* es handelt sich um ein feldzugriff auf this */
 323                                 @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);
 324                         } else { /* param oder var */
 325                                 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;
 326                                 @Lexpr.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 327                         }
 328                 }
 329
 330                 @reg if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 331                         /* TODO: kein schoener hack? */
 332                         @Lexpr.node@->kids[0]->reg = @Lexpr.node@->reg;
 333                 }
 334           @}
 335
 336         | Feld
 337         ;
 338
 339 Feld: Term '.' IDENT
 340           @{
 341             @c check(@Feld.s@, @IDENT.name@, S_FIELD);
 342             @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);
 343
 344                 @reg @Term.node@->reg = next_reg(@Feld.node@->reg, @Term.gparamges@);
 345           @}
 346         ;
 347
 348 Expr:
 349           Term
 350           @{
 351             @reg @Term.node@->reg = @Expr.node@->reg;
 352           @}
 353
 354         | NOT Term
 355           @{
 356                 @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.node@, new_node(O_NULL, TREENULL, TREENULL)), TREENULL);
 357
 358                 @reg @Term.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 359           @}
 360
 361         | Term Minusterm
 362           @{
 363             @i @Expr.node@ = new_node(O_SUB, @Term.node@, @Minusterm.node@);
 364                 @i @Expr.imm@ = @Term.imm@ && @Minusterm.imm@;
 365                 @i @Expr.call@ = @Term.call@ || @Minusterm.call@;
 366
 367                 @reg {
 368                         if(!(@Expr.node@->kids[0] == TREENULL && @Expr.node@->kids[1] == TREENULL)) {
 369                                 @Term.node@->reg = @Expr.node@->reg;
 370                                 if(@Minusterm.imm@) {
 371                                         @Minusterm.node@->reg = @Expr.node@->reg;
 372                                 } else {
 373                                         @Minusterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 374                                 }
 375                         }
 376                 }
 377           @}
 378
 379         | Term Multerm
 380           @{
 381             @i @Expr.node@ = new_node(O_MUL, @Term.node@, @Multerm.node@);
 382                 @i @Expr.imm@ = @Term.imm@ && @Multerm.imm@;
 383                 @i @Expr.call@ = @Term.call@ || @Multerm.call@;
 384
 385                 @reg {
 386                         @Term.node@->reg = next_reg(@Expr.node@->reg, @Expr.gparamges@);
 387                         if(@Term.imm@) {
 388                                 @Multerm.node@->reg = @Expr.node@->reg;
 389                         } else {
 390                                 @Multerm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 391                         }
 392                 }
 393           @}
 394
 395         | Term Orterm
 396           @{
 397             @i @Expr.node@ = new_node(O_OR, @Term.node@, @Orterm.node@);
 398                 @i @Expr.imm@ = @Term.imm@ && @Orterm.imm@;
 399                 @i @Expr.call@ = @Term.call@ || @Orterm.call@;
 400
 401                 @reg {
 402                         @Term.node@->reg = @Expr.node@->reg;
 403                         @Orterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 404                 }
 405           @}
 406
 407         | Term '<' Term
 408           @{
 409             @i @Expr.node@ = new_node(O_BOOL, new_node(O_LESS, @Term.0.node@, @Term.1.node@), TREENULL);
 410                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 411                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 412
 413                 @reg {
 414                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 415                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 416                 }
 417           @}
 418
 419         | Term '=' Term
 420           @{
 421             @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.0.node@, @Term.1.node@), TREENULL);
 422                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 423                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 424
 425                 @reg {
 426                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 427                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 428                 }
 429           @}
 430         ;
 431
 432 Minusterm:
 433           '-' Term Minusterm
 434           @{
 435             @i @Minusterm.node@ = new_node(O_ADD, @Minusterm.1.node@, @Term.node@);
 436                 @i @Minusterm.0.imm@ = @Term.imm@ && @Minusterm.1.imm@;
 437                 @i @Minusterm.0.call@ = @Term.call@ || @Minusterm.1.call@;
 438
 439             @reg {
 440                         @Minusterm.1.node@->reg = @Minusterm.node@->reg;
 441                         if(@Minusterm.1.imm@) {
 442                                 @Term.node@->reg = @Minusterm.node@->reg;
 443                         } else {
 444                                 @Term.node@->reg = next_reg(@Minusterm.1.node@->reg, @Minusterm.gparamges@);
 445                         }
 446                 }
 447           @}
 448
 449         | '-' Term
 450           @{
 451             @reg @Term.node@->reg = @Minusterm.node@->reg;
 452           @}
 453         ;
 454
 455 Multerm:
 456           '*' Term Multerm
 457           @{
 458             @i @Multerm.node@ = new_node(O_MUL, @Multerm.1.node@, @Term.node@);
 459                 @i @Multerm.0.imm@ = @Term.imm@ && @Multerm.1.imm@;
 460                 @i @Multerm.0.call@ = @Term.call@ || @Multerm.1.call@;
 461
 462             @reg {
 463                         @Multerm.1.node@->reg = @Multerm.node@->reg;
 464                         if(@Multerm.1.imm@) {
 465                                 @Term.node@->reg = @Multerm.node@->reg;
 466                         } else {
 467                                 @Term.node@->reg = next_reg(@Multerm.1.node@->reg, @Multerm.gparamges@);
 468                         }
 469                 }
 470           @}
 471
 472         | '*' Term
 473           @{
 474             @reg @Term.node@->reg = @Multerm.node@->reg;
 475           @}
 476         ;
 477
 478 Orterm:
 479           OR Term Orterm
 480           @{
 481             @i @Orterm.node@ = new_node(O_OR, @Orterm.1.node@, @Term.node@);
 482                 @i @Orterm.0.imm@ = @Term.imm@ && @Orterm.1.imm@;
 483                 @i @Orterm.0.call@ = @Term.call@ || @Orterm.1.call@;
 484
 485             @reg {
 486                         @Orterm.1.node@->reg = @Orterm.node@->reg;
 487                         if(@Orterm.1.imm@) {
 488                                 @Term.node@->reg = @Orterm.node@->reg;
 489                         } else {
 490                                 @Term.node@->reg = next_reg(@Orterm.1.node@->reg, @Orterm.gparamges@);
 491                         }
 492                 }
 493           @}
 494         | OR Term
 495           @{
 496             @reg @Term.node@->reg = @Orterm.node@->reg;
 497           @}
 498
 499         ;
 500
 501 Term:
 502           '(' Expr ')'
 503           @{
 504             @i @Term.node@ = @Expr.node@;
 505           @}
 506
 507         | NUM
 508           @{
 509             @i @Term.node@ = new_number(@NUM.val@);
 510                 @i @Term.imm@ = 1;
 511                 @i @Term.call@ = 0;
 512           @}
 513
 514         | '-' NUM
 515           @{
 516             @i @Term.node@ = new_number(-1 * (@NUM.val@));
 517                 @i @Term.imm@ = 1;
 518                 @i @Term.call@ = 0;
 519           @}
 520
 521         | THIS
 522           @{
 523             @i @Term.node@ = new_param(O_ID, strdup("this"), TREENULL, TREENULL, 0);
 524                 @i @Term.imm@ = 0;
 525                 @i @Term.call@ = 0;
 526           @}
 527
 528         | IDENT
 529           @{
 530             @c check(@Term.s@, @IDENT.name@, S_VAR|S_PARM);
 531
 532                 @i @Term.imm@ = 0;
 533                 @i @Term.call@ = 0;
 534             @i {
 535                         @Term.node@ = TREENULL;
 536                         if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 537                                 /* es handelt sich um ein feldzugriff auf this */
 538                                 @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);
 539                         } else { /* param oder var */
 540                                 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;
 541                                 @Term.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 542                         }
 543                 }
 544
 545                 @reg if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 546                         /* TODO: kein schoener hack? */
 547                         @Term.node@->kids[0]->reg = @Term.node@->reg;
 548                 }
 549           @}
 550
 551         | Feld
 552           @{
 553             @i @Term.node@ = @Feld.node@;
 554                 @i @Term.imm@ = 0;
 555           @}
 556
 557         | IDENT '(' Exprs ')'
 558           @{
 559             @i {
 560                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, new_nothing(), 0) /*this*/,
 561                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 562                         @Term.node@->soffset = MAX(@Exprs.paramcount@, @Term.gparamges@);
 563                 }
 564                 @i @Exprs.cnt@ = 1;
 565                 @i @Term.imm@ = 0;
 566                 @i @Term.call@ = 1;
 567                 @reg @Exprs.node@->reg = @Term.node@->reg;
 568           @}
 569
 570         | Term '.' IDENT '(' Exprs ')'
 571           @{
 572             @i {
 573                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, @Term.1.node@, 0) /*this*/,
 574                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 575                         @Term.node@->soffset = MAX(@Exprs.paramcount@, @Term.gparamges@);
 576                 }
 577                 @i @Exprs.cnt@ = 1;
 578                 @i @Term.imm@ = 0;
 579                 @i @Term.call@ = 1;
 580                 @reg @Exprs.node@->reg = @Term.1.node@->reg = @Term.node@->kids[0]->reg = @Term.node@->reg;
 581           @}
 582
 583         ;
 584
 585 Exprs:
 586           Expr ',' Exprs
 587           @{
 588                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, @Exprs.1.node@, @Exprs.0.cnt@);
 589                 @i @Exprs.0.paramcount@ = @Exprs.1.paramcount@;
 590                 @i @Exprs.1.cnt@ = @Exprs.0.cnt@ + 1;
 591                 @reg @Expr.node@->reg = @Exprs.0.node@->reg; @Exprs.1.node@->reg = next_reg(@Exprs.0.node@->reg, @Exprs.gparamges@);
 592           @}
 593         | Expr
 594           @{
 595                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, new_nothing(), @Exprs.cnt@);
 596                 @i @Exprs.paramcount@ = @Exprs.cnt@ + 1;
 597                 @reg @Expr.node@->reg = @Exprs.0.node@->reg;
 598           @}
 599         |
 600           @{
 601                 @i @Exprs.0.node@ = new_nothing();
 602                 @i @Exprs.paramcount@ = @Exprs.cnt@;
 603           @}
 604         ;
 605 %%
 606
 607 extern int yylex();
 608 extern int yylineno;
 609
 610 int yyerror(char *error_text)
 611 {
 612         fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
 613         exit(2);
 614 }
 615
 616 int main(int argc, char **argv)
 617 {
 618         #if 0
 619         yydebug=1;
 620         #endif
 621         yyparse();
 622         return 0;
 623 }
 624