gesamt_ppc/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, VARBEGIN - @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, VARBEGIN - @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                         /* TODO: kann ich mir das test wirklich wegan and davor sparen? */
 258                         printf("\tbeq 0,.%s_ifelse_%d\n", get_func_name(), @Statement.lblcnt_in@);
 259                 }
 260                 @gen @revorder(1) printf(".%s_ifend_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 261           @}
 262
 263         | WHILE Expr DO Statseq END
 264           @{
 265                 statinout()
 266                 @i @Statseq.lblcnt_in@ =  @Statement.lblcnt_in@ + 1;
 267                 @i @Statement.lblcnt_out@ = @Statseq.lblcnt_out@;
 268
 269                 @i @Statseq.vars_in@ = @Statement.vars_in@;
 270                 @i @Statement.vars_out@ = @Statseq.vars_out@;
 271
 272                 @i @Statement.call@ = @Expr.call@ || @Statseq.call@;
 273
 274                 xxputsin(@Expr.s@,)
 275                 xxputsin(@Statseq.s@,)
 276
 277                 @i @Statement.node@ = new_node(O_IF, @Expr.node@, TREENULL);
 278
 279                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 280                 @gen {
 281                         printf(".%s_whilestart_%d:\n", get_func_name(), @Statement.lblcnt_in@);
 282                         write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1);
 283                         /* TODO: kann ich mir das test wirklich wegan and davor sparen? */
 284                         printf("\tbeq 0,.%s_whileend_%d\n", get_func_name(), @Statement.lblcnt_in@);
 285                 }
 286                 @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@);
 287           @}
 288
 289         | RETURN Expr
 290           @{
 291                 statinout()
 292                 lblcountinout()
 293                 varsinout()
 294                 xxputsin(@Expr.s@,)
 295
 296                 @i @Statement.node@ = new_node(O_RET, @Expr.node@, TREENULL);
 297                 @reg @Statement.node@->reg = @Expr.node@->reg = next_reg((char *)NULL, @Expr.gparamges@);
 298
 299                 @gen write_tree(@Statement.node@, 0); burm_label(@Statement.node@); burm_reduce(@Statement.node@, 1); func_footer();
 300           @}
 301         ;
 302
 303 Elsestat:
 304           ELSE Statseq
 305           @{
 306                 @i @Statseq.lblcnt_in@ =  @Elsestat.lblcnt_in@;
 307                 @i @Elsestat.lblcnt_out@ =  @Statseq.lblcnt_out@;
 308
 309                 @i @Statseq.vars_in@ = @Elsestat.vars_in@;
 310                 @i @Elsestat.vars_out@ = @Statseq.vars_out@;
 311
 312                 @gen printf("\tb .%s_ifend_%d\n.%s_ifelse_%d:\n", get_func_name(), @Elsestat.reallblcnt@, get_func_name(), @Elsestat.reallblcnt@);
 313           @}
 314
 315 Lexpr:
 316           IDENT
 317           @{
 318             @c check(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM);
 319
 320                 /* TODO: selbe Code wie bei Term/IDENT -- schoener machen! */
 321             @i {
 322                         @Lexpr.node@ = TREENULL;
 323                         if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 324                                 /* es handelt sich um ein feldzugriff auf this */
 325                                 @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);
 326                         } else { /* param oder var */
 327                                 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;
 328                                 @Lexpr.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 329                         }
 330                 }
 331
 332                 @reg if(tab_lookup(@Lexpr.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 333                         /* TODO: kein schoener hack? */
 334                         @Lexpr.node@->kids[0]->reg = @Lexpr.node@->reg;
 335                 }
 336           @}
 337
 338         | Feld
 339         ;
 340
 341 Feld: Term '.' IDENT
 342           @{
 343             @c check(@Feld.s@, @IDENT.name@, S_FIELD);
 344             @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);
 345
 346                 @reg @Term.node@->reg = next_reg(@Feld.node@->reg, @Term.gparamges@);
 347           @}
 348         ;
 349
 350 Expr:
 351           Term
 352           @{
 353             @reg @Term.node@->reg = @Expr.node@->reg;
 354           @}
 355
 356         | NOT Term
 357           @{
 358                 @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.node@, new_node(O_NULL, TREENULL, TREENULL)), TREENULL);
 359
 360                 @reg @Term.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 361           @}
 362
 363         | Term Minusterm
 364           @{
 365             @i @Expr.node@ = new_node(O_SUB, @Term.node@, @Minusterm.node@);
 366                 @i @Expr.imm@ = @Term.imm@ && @Minusterm.imm@;
 367                 @i @Expr.call@ = @Term.call@ || @Minusterm.call@;
 368
 369                 @reg {
 370                         if(!(@Expr.node@->kids[0] == TREENULL && @Expr.node@->kids[1] == TREENULL)) {
 371                                 @Term.node@->reg = @Expr.node@->reg;
 372                                 if(@Minusterm.imm@) {
 373                                         @Minusterm.node@->reg = @Expr.node@->reg;
 374                                 } else {
 375                                         @Minusterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 376                                 }
 377                         }
 378                 }
 379           @}
 380
 381         | Term Multerm
 382           @{
 383             @i @Expr.node@ = new_node(O_MUL, @Term.node@, @Multerm.node@);
 384                 @i @Expr.imm@ = @Term.imm@ && @Multerm.imm@;
 385                 @i @Expr.call@ = @Term.call@ || @Multerm.call@;
 386
 387                 @reg {
 388                         @Term.node@->reg = @Expr.node@->reg;
 389                         if(@Term.imm@) {
 390                                 @Multerm.node@->reg = @Expr.node@->reg;
 391                         } else {
 392                                 @Multerm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 393                         }
 394                 }
 395           @}
 396
 397         | Term Orterm
 398           @{
 399             @i @Expr.node@ = new_node(O_OR, @Term.node@, @Orterm.node@);
 400                 @i @Expr.imm@ = @Term.imm@ && @Orterm.imm@;
 401                 @i @Expr.call@ = @Term.call@ || @Orterm.call@;
 402
 403                 @reg {
 404                         @Term.node@->reg = @Expr.node@->reg;
 405                         @Orterm.node@->reg = next_reg(@Term.node@->reg, @Expr.gparamges@);
 406                 }
 407           @}
 408
 409         | Term '<' Term
 410           @{
 411             @i @Expr.node@ = new_node(O_BOOL, new_node(O_LESS, @Term.0.node@, @Term.1.node@), TREENULL);
 412                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 413                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 414
 415                 @reg {
 416                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 417                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 418                 }
 419           @}
 420
 421         | Term '=' Term
 422           @{
 423             @i @Expr.node@ = new_node(O_BOOL, new_node(O_EQ, @Term.0.node@, @Term.1.node@), TREENULL);
 424                 @i @Expr.imm@ = @Term.0.imm@ && @Term.1.imm@;
 425                 @i @Expr.call@ = @Term.0.call@ || @Term.1.call@;
 426
 427                 @reg {
 428                         @Term.0.node@->reg = @Expr.node@->kids[0]->reg = @Expr.node@->reg;
 429                         @Term.1.node@->reg = next_reg(@Term.0.node@->reg, @Expr.gparamges@);
 430                 }
 431           @}
 432         ;
 433
 434 Minusterm:
 435           '-' Term Minusterm
 436           @{
 437             @i @Minusterm.node@ = new_node(O_ADD, @Minusterm.1.node@, @Term.node@);
 438                 @i @Minusterm.0.imm@ = @Term.imm@ && @Minusterm.1.imm@;
 439                 @i @Minusterm.0.call@ = @Term.call@ || @Minusterm.1.call@;
 440
 441             @reg {
 442                         @Minusterm.1.node@->reg = @Minusterm.node@->reg;
 443                         if(@Minusterm.1.imm@) {
 444                                 @Term.node@->reg = @Minusterm.node@->reg;
 445                         } else {
 446                                 @Term.node@->reg = next_reg(@Minusterm.1.node@->reg, @Minusterm.gparamges@);
 447                         }
 448                 }
 449           @}
 450
 451         | '-' Term
 452           @{
 453             @reg @Term.node@->reg = @Minusterm.node@->reg;
 454           @}
 455         ;
 456
 457 Multerm:
 458           '*' Term Multerm
 459           @{
 460             @i @Multerm.node@ = new_node(O_MUL, @Multerm.1.node@, @Term.node@);
 461                 @i @Multerm.0.imm@ = @Term.imm@ && @Multerm.1.imm@;
 462                 @i @Multerm.0.call@ = @Term.call@ || @Multerm.1.call@;
 463
 464             @reg {
 465                         @Multerm.1.node@->reg = @Multerm.node@->reg;
 466                         if(@Multerm.1.imm@) {
 467                                 @Term.node@->reg = @Multerm.node@->reg;
 468                         } else {
 469                                 @Term.node@->reg = next_reg(@Multerm.1.node@->reg, @Multerm.gparamges@);
 470                         }
 471                 }
 472           @}
 473
 474         | '*' Term
 475           @{
 476             @reg @Term.node@->reg = @Multerm.node@->reg;
 477           @}
 478         ;
 479
 480 Orterm:
 481           OR Term Orterm
 482           @{
 483             @i @Orterm.node@ = new_node(O_OR, @Orterm.1.node@, @Term.node@);
 484                 @i @Orterm.0.imm@ = @Term.imm@ && @Orterm.1.imm@;
 485                 @i @Orterm.0.call@ = @Term.call@ || @Orterm.1.call@;
 486
 487             @reg {
 488                         @Orterm.1.node@->reg = @Orterm.node@->reg;
 489                         if(@Orterm.1.imm@) {
 490                                 @Term.node@->reg = @Orterm.node@->reg;
 491                         } else {
 492                                 @Term.node@->reg = next_reg(@Orterm.1.node@->reg, @Orterm.gparamges@);
 493                         }
 494                 }
 495           @}
 496         | OR Term
 497           @{
 498             @reg @Term.node@->reg = @Orterm.node@->reg;
 499           @}
 500
 501         ;
 502
 503 Term:
 504           '(' Expr ')'
 505           @{
 506             @i @Term.node@ = @Expr.node@;
 507           @}
 508
 509         | NUM
 510           @{
 511             @i @Term.node@ = new_number(@NUM.val@);
 512                 @i @Term.imm@ = 1;
 513                 @i @Term.call@ = 0;
 514           @}
 515
 516         | '-' NUM
 517           @{
 518             @i @Term.node@ = new_number(-1 * (@NUM.val@));
 519                 @i @Term.imm@ = 1;
 520                 @i @Term.call@ = 0;
 521           @}
 522
 523         | THIS
 524           @{
 525             @i @Term.node@ = new_param(O_ID, strdup("this"), TREENULL, TREENULL, 0);
 526                 @i @Term.imm@ = 0;
 527                 @i @Term.call@ = 0;
 528           @}
 529
 530         | IDENT
 531           @{
 532             @c check(@Term.s@, @IDENT.name@, S_VAR|S_PARM);
 533
 534                 @i @Term.imm@ = 0;
 535                 @i @Term.call@ = 0;
 536             @i {
 537                         @Term.node@ = TREENULL;
 538                         if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 539                                 /* es handelt sich um ein feldzugriff auf this */
 540                                 @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);
 541                         } else { /* param oder var */
 542                                 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;
 543                                 @Term.node@ = new_param(O_ID, @IDENT.name@, TREENULL, TREENULL, tmp);
 544                         }
 545                 }
 546
 547                 @reg if(tab_lookup(@Term.s@, @IDENT.name@, S_VAR|S_PARM) == SYMNULL) {
 548                         /* TODO: kein schoener hack? */
 549                         @Term.node@->kids[0]->reg = @Term.node@->reg;
 550                 }
 551           @}
 552
 553         | Feld
 554           @{
 555             @i @Term.node@ = @Feld.node@;
 556                 @i @Term.imm@ = 0;
 557           @}
 558
 559         | IDENT '(' Exprs ')'
 560           @{
 561             @i {
 562                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, new_nothing(), 0) /*this*/,
 563                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 564                         @Term.node@->soffset = MAX(@Exprs.paramcount@, @Term.gparamges@);
 565                 }
 566                 @i @Exprs.cnt@ = 1;
 567                 @i @Term.imm@ = 0;
 568                 @i @Term.call@ = 1;
 569                 @reg @Exprs.node@->reg = @Term.node@->reg;
 570           @}
 571
 572         | Term '.' IDENT '(' Exprs ')'
 573           @{
 574             @i {
 575                         @Term.node@ = new_call(@IDENT.name@, new_arg(@Exprs.node@, @Term.1.node@, 0) /*this*/,
 576                                         TREENULL, @Term.gparamges@, @Term.vars_in@);
 577                         @Term.node@->soffset = MAX(@Exprs.paramcount@, @Term.gparamges@);
 578                 }
 579                 @i @Exprs.cnt@ = 1;
 580                 @i @Term.imm@ = 0;
 581                 @i @Term.call@ = 1;
 582                 @reg @Exprs.node@->reg = @Term.1.node@->reg = @Term.node@->kids[0]->reg = @Term.node@->reg;
 583           @}
 584
 585         ;
 586
 587 Exprs:
 588           Expr ',' Exprs
 589           @{
 590                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, @Exprs.1.node@, @Exprs.0.cnt@);
 591                 @i @Exprs.0.paramcount@ = @Exprs.1.paramcount@;
 592                 @i @Exprs.1.cnt@ = @Exprs.0.cnt@ + 1;
 593                 @reg @Expr.node@->reg = @Exprs.0.node@->reg; @Exprs.1.node@->reg = next_reg(@Exprs.0.node@->reg, @Exprs.gparamges@);
 594           @}
 595         | Expr
 596           @{
 597                 @i @Exprs.0.node@ = new_arg(@Expr.0.node@, new_nothing(), @Exprs.cnt@);
 598                 @i @Exprs.paramcount@ = @Exprs.cnt@ + 1;
 599                 @reg @Expr.node@->reg = @Exprs.0.node@->reg;
 600           @}
 601         |
 602           @{
 603                 @i @Exprs.0.node@ = new_nothing();
 604                 @i @Exprs.paramcount@ = @Exprs.cnt@;
 605           @}
 606         ;
 607 %%
 608
 609 extern int yylex();
 610 extern int yylineno;
 611
 612 int yyerror(char *error_text)
 613 {
 614         fprintf(stderr,"Zeile %i: %s\n", yylineno, error_text);
 615         exit(2);
 616 }
 617
 618 int main(int argc, char **argv)
 619 {
 620         #if 0
 621         yydebug=1;
 622         #endif
 623         yyparse();
 624         return 0;
 625 }
 626