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Length: 20254 (0x4f1e)
Types: TextFile
Names: »PARSER.P«
└─⟦b8af24a88⟧ Bits:30005796 CR80 Disc Pack ( MINICAMPS )
└─⟦this⟧ »GENS.D!D_PARSE.D!PARSER.P«
======== COMPILATION STARTED AT: 81:09:01 12:53
======== PARSER.S
00.00001 "-----------------------------------------------------------------------
00.00002 "
00.00003 "
00.00004 " MODULE NAME: BOTTOM UP PARSER
00.00005 " MODULE ID NMB: CSS/210
00.00006 " MODULE VERSION: 1
00.00007 " MODULE TYPE: LINK (SUB)MODULE
00.00008 " MERGE FILES: @**GENS.D*PARSE.D*CHARCLASSTABLE.I
00.00009 "
00.00010 " SPECIFICATIONS: -
00.00011 " AUTHOR/DATE: LKN/810102
00.00012 "
00.00013 " DELIVERABLE: YES
00.00014 " SOURCE LANGUAGE: SWELL
00.00015 " COMPILE COMPUTER: CR80
00.00016 " TARGET COMPUTER: CR80
00.00017 " OPER. SYSTEM: AMOS
00.00018 "
00.00019 "-----------------------------------------------------------------------
00.00020 "
00.00021 " CHANGE RECORD
00.00022 "
00.00023 " VERSION AUTHOR/DATE DESCRIPTION OF CHANGE
00.00024 " ------- ----------- ---------------------
00.00025 "
00.00026 "-----------------------------------------------------------------------
00.00027 "PAGE«ff»00.00028
00.00028 SUBMODULE BOTTOM_UP_PARSER;
00.00029
00.00030
00.00031 "**********************************************************************"
00.00032 " "
00.00033 " THIS MODULE IS A GENERAL TOOL FOR TABLE DRIVEN BOTTOM UP PARSING. "
00.00034 " "
00.00035 " THE TABLES MAY BE GENERATED BY AN AUTOMATIC PARSE TABLE GENERATOR, "
00.00036 " USING SLR1 OR OTHER TECHNIQUES, REQUIRING A SINGLE LOOKAHEAD SYM- "
00.00037 " BOL, AND USING THE ACTIONS: REDUCE, SHIFT/STACK, FAULT AND JUMP. "
00.00038 " "
00.00039 "**********************************************************************"
00.00040
00.00041
00.00042 %SOURCE
======== CHARCLASSTABLE.I
======== PARSER.S
00.00042
00.00043
00.00044 CONST
00.00045 MAXSYMBOLLENGTH = 132;
00.00046 SP = 32;
00.00047
00.00048
00.00049 TYPE
00.00050 PARSE_ERRORS =
00.00051 ( UNKNOWN_SYMBOL,
00.00052 CONST_OVERFLOW,
00.00053 UNEXPECTED_SYMBOL,
00.00054 STRING_SYNTAX,
00.00055 STRING_SIZE,
00.00056 PARSESTACKFULL,
00.00057 UNRECOVERABLE );
00.00058 SYMBOLTYPE =
00.00059 ( EMPTY,
00.00060 NAME,
00.00061 CONSTANT,
00.00062 STRING,
00.00063 ERRORSYM );
00.00064 ACTIONTYPE =
00.00065 ( REDUCE,
00.00066 SHIFT,
00.00067 FAULT,
00.00068 JUMP );
00.00069 STRINGSTATES =
00.00070 ( INSTRING,
00.00071 AFTERLEFTPAR,
00.00072 INCHARVALUE,
00.00073 BEFORERIGHTPAR );
00.00074
00.00075 TABLEHEAD =
00.00076 RECORD
00.00077 SAVEREGS: ARRAY [0..6] OF INTEGER;
00.00078 TABLELINK, ITEMSIZE, STACKLIMIT, RECOVERING, WINDOW1, WINDOW2,
00.00079 PRODUCTIONS, ACTIONS, SCANENTRIES, RECOVERSYMBOLS: INTEGER;
00.00080 END;
00.00081 STACKENTRY =
00.00082 RECORD
00.00083 ACTION: INTEGER;
00.00084 END;
00.00085 SCANENTRY =
00.00086 RECORD
00.00087 CH, SYMBOL, ALTERNATIVE, NEXT: INTEGER;
00.00088 END;
00.00089 ACTIONENTRY =
00.00090 RECORD
00.00091 SYMBACTION, OBJECT: INTEGER;
00.00092 END;
00.00093 PRODUCTIONENTRY =
00.00094 RECORD
00.00095 SYMBLENGTH: INTEGER;
00.00096 END;
00.00097
00.00098
00.00099 VAR
00.00100 TABLEPTR, "POINTER TO PARSE TABLE HEADER (TABLEHEAD)
00.00101 CURRCHAR, "LAST SCANNED CHARACTER
00.00102 CURRCLASS: "CLASS OF LAST SCANNED CHARACTER
00.00103 INTEGER;
00.00104
00.00105 EXPORT VAR
00.00106 SYMBOLBUF: ARRAY [0..MAXSYMBOLLENGTH+6] OF CHAR;
00.00107
00.00108 INIT
00.00109 CURRCLASS = IGNORE;
00.00110
00.00111
00.00112
00.00113 IMPORT PROCEDURE IN_BYTE
00.00114 "====================="
00.00115 (R3; "CHARACTER VALUE (RETURN)
00.00116 R6); "LINK
00.00117
00.00118
00.00119
00.00120 PROCEDURE GETCHAR
00.00121 "==============="
00.00122 (R0; "CHARACTER VALUE (RETURN)
00.00123 R7; "CHARACTER CLASS (RETURN)
00.00124 R6); "LINK
00.00125 VAR
00.00126 SAVER3, SAVER4, SAVER6: INTEGER;
00.00127 BEGIN
00.00128 R3=>SAVER3;
00.00129 R4=>SAVER4;
00.00130 R6=>SAVER6;
00.00131 REPEAT
00.00132 IN_BYTE(R3, R6);
00.00133 R3 EXTRACT 7;
00.00134 CHARCLASSTABLE[R3=>R7]=>R0=>R7;
00.00135 UNTIL R7 <> SKIP;
00.00136 R7=>CURRCLASS;
00.00137 R3=>R0=>CURRCHAR;
00.00138 SAVER3=>R3;
00.00139 SAVER4=>R4;
00.00140 EXIT(SAVER6);
00.00141 END;
00.00142
00.00143
00.00144
00.00145 PROCEDURE SEMANTICS
00.00146 "================="
00.00147 (R1; "SEMANTIC ACTION NO
00.00148 R2; "ATTRIBUTE
00.00149 R5; "PARSE STACK POINTER
00.00150 R6); "LINK
00.00151 "R4 IS DESTROYED AT RETURN
00.00152 BEGIN
00.00153 TABLEPTR=>R4;
00.00154 EXIT(R4@TABLEHEAD.SAVEREGS[4]);
00.00155 END;
00.00156
00.00157
00.00158
00.00159 PROCEDURE NEXTSYMBOL
00.00160 "=================="
00.00161 (R1; "SYMBOL NUMBER (RETURN)
00.00162 R2; "ATTRIBUTE (RETURN)
00.00163 R6); "LINK
00.00164 LABEL NEWSYMBOL;
00.00165 VAR
00.00166 ATTRIBUTE: LONG;
00.00167 SAVER0, SAVER3, SAVER4, SAVER5, SAVER6, SAVER7: INTEGER;
00.00168 STRINGSTATE, STRINGPOS: INTEGER;
00.00169 BEGIN
00.00170 R0=>SAVER0;
00.00171 R3=>SAVER3;
00.00172 R4=>SAVER4;
00.00173 R5=>SAVER5;
00.00174 R6=>SAVER6;
00.00175 R7=>SAVER7;
00.00176 CURRCHAR=>R0;
00.00177 CURRCLASS=>R7;
00.00178 NEWSYMBOL:
00.00179 WHILE R7 = IGNORE DO GETCHAR(R0, R7, R6);
00.00180
00.00181 CASE R7:CHARCLASS OF
00.00182
00.00183 ALFA:
00.00184 BEGIN
00.00185 TABLEPTR=>R4;
00.00186 R4+R4@TABLEHEAD.SCANENTRIES+SIZE(SCANENTRY);
00.00187 IF R0 >= 'a' LOGAND R0 < ('z'+1) THEN
00.00188 R0 - ('a' - 'A');
00.00189 WHILE R4@SCANENTRY.CH <> R0 LOGAND R4@SCANENTRY.CH <> 0 DO
00.00190 R4+R4@SCANENTRY.ALTERNATIVE;
00.00191 R0=>SYMBOLBUF[0=>R5];
00.00192 GETCHAR(R0, R7, R6);
00.00193 WHILE R7 < DELIMITER DO
00.00194 BEGIN
00.00195 R4+R4@SCANENTRY.NEXT;
00.00196 IF R0 >= 'a' LOGAND R0 < ('z'+1) THEN
00.00197 R0 - ('a' - 'A');
00.00198 IF R5 < MAXSYMBOLLENGTH THEN R0=>SYMBOLBUF[R5+1];
00.00199 WHILE R4@SCANENTRY.CH <> R0 LOGAND R4@SCANENTRY.CH <> 0 DO
00.00200 R4+R4@SCANENTRY.ALTERNATIVE;
00.00201 GETCHAR(R0, R7, R6);
00.00202 END;
00.00203 R4@SCANENTRY.SYMBOL=>R1;
00.00204 IF R1 = 0 LOGOR R1 = ERRORSYM THEN
00.00205 BEGIN
00.00206 NAME=>R1;
00.00207 0=>R2;
00.00208 R2=>SYMBOLBUF[R5+1];
00.00209 R2=>SYMBOLBUF[R5+1];
00.00210 END;
00.00211 END;
00.00212
00.00213 NUMERIC:
00.00214 BEGIN
00.00215 ADDRESS(ATTRIBUTE)=>R5;
00.00216 0=>R5@INTEGER;
00.00217 10=>R1;
00.00218 REPEAT
00.00219 IF R5@INTEGER >= 6554 LOGOR
00.00220 R5@INTEGER >= 6553 LOGAND R0 >= '6'
00.00221 THEN SEMANTICS(ERRORSYM=>R1, CONST_OVERFLOW=>R2, R5, R6) ELSE
00.00222 BEGIN
00.00223 R5@LONG*R1;
00.00224 R5@INTEGER+(R0-'0');
00.00225 END;
00.00226 GETCHAR(R0, R7, R6);
00.00227 UNTIL R7 <> NUMERIC;
00.00228 CONSTANT=>R1;
00.00229 R5@INTEGER=>R2;
00.00230 END;
00.00231
00.00232 DELIMITER:
00.00233 BEGIN
00.00234 TABLEPTR=>R4;
00.00235 R4+R4@TABLEHEAD.SCANENTRIES+SIZE(SCANENTRY);
00.00236 WHILE R4@SCANENTRY.CH <> R0 LOGAND R4@SCANENTRY.CH <> 0 DO
00.00237 R4+R4@SCANENTRY.ALTERNATIVE;
00.00238 R4=>R5;
00.00239 IF R4@SCANENTRY.NEXT=>R6 < 0 THEN IGNORE=>R7=>CURRCLASS ELSE
00.00240 GETCHAR(R0, R7, R6);
00.00241 WHILE R7 = DELIMITER LOGAND R4@SCANENTRY.CH <> 0 DO
00.00242 BEGIN
00.00243 R4=>R5;
00.00244 R4+R4@SCANENTRY.NEXT;
00.00245 WHILE R4@SCANENTRY.CH <> R0 LOGAND R4@SCANENTRY.CH <> 0 DO
00.00246 R4+R4@SCANENTRY.ALTERNATIVE;
00.00247 IF R4@SCANENTRY.CH <> 0 THEN
00.00248 BEGIN
00.00249 R4=>R5;
00.00250 IF R4@SCANENTRY.NEXT=>R6 < 0 THEN IGNORE=>R7=>CURRCLASS ELSE
00.00251 GETCHAR(R0, R7, R6);
00.00252 END;
00.00253 END;
00.00254 R5@SCANENTRY.SYMBOL=>R1;
00.00255 IF R1 = 0 THEN
00.00256 BEGIN
00.00257 ERRORSYM=>R1;
00.00258 SEMANTICS(R1, UNKNOWN_SYMBOL=>R2, R5, R6);
00.00259 END;
00.00260 END;
00.00261
00.00262 COMMENTCHAR:
00.00263 BEGIN
00.00264 REPEAT
00.00265 GETCHAR(R0, R7, R6);
00.00266 UNTIL R7 = COMMENTCHAR LOGOR R0 < SP;
00.00267 IGNORE=>R7;
00.00268 GOTO NEWSYMBOL;
00.00269 END;
00.00270
00.00271 STRINGCHAR:
00.00272 BEGIN
00.00273 -1=>R5;
00.00274 INSTRING=>R6=>STRINGSTATE;
00.00275 REPEAT
00.00276 GETCHAR(R0, R7, R6);
00.00277 WHILE R7 <> STRINGCHAR LOGAND R0 >= SP DO
00.00278 BEGIN
00.00279 R0=>SYMBOLBUF[R5+1];
00.00280 IF R5 >= MAXSYMBOLLENGTH THEN
00.00281 BEGIN
00.00282 SEMANTICS(ERRORSYM=>R1, STRING_SIZE=>R2, R5, R6);
00.00283 -1=>R5;
00.00284 END;
00.00285 CASE STRINGSTATE=>R6 OF
00.00286 INSTRING:
00.00287 IF R0 = '(' THEN
00.00288 BEGIN
00.00289 R5=>STRINGPOS;
00.00290 AFTERLEFTPAR=>R6=>STRINGSTATE;
00.00291 END;
00.00292 AFTERLEFTPAR:
00.00293 IF R0 = ':' THEN
00.00294 BEGIN
00.00295 ADDRESS(ATTRIBUTE)=>R2;
00.00296 0=>R2@INTEGER;
00.00297 10=>R1;
00.00298 INCHARVALUE=>R6=>STRINGSTATE;
00.00299 END ELSE
00.00300 IF R0 <> '(' THEN INSTRING=>R6=>STRINGSTATE;
00.00301 INCHARVALUE:
00.00302 BEGIN
00.00303 IF R7 = NUMERIC THEN
00.00304 BEGIN
00.00305 R2@LONG*R1;
00.00306 R2@INTEGER+(R0-'0');
00.00307 IF R2@INTEGER >= 128 THEN INSTRING=>R6;
00.00308 END ELSE
00.00309 IF R0 = ':' THEN BEFORERIGHTPAR=>R6;
00.00310 R6=>STRINGSTATE;
00.00311 END;
00.00312 BEFORERIGHTPAR:
00.00313 BEGIN
00.00314 IF R0 = ')' THEN R2@INTEGER=>R2=>SYMBOLBUF[STRINGPOS=>R5];
00.00315 INSTRING=>R6=>STRINGSTATE;
00.00316 END;
00.00317 END;
00.00318 GETCHAR(R0, R7, R6);
00.00319 END;
00.00320 IF R7 <> STRINGCHAR
00.00321 THEN SEMANTICS(ERRORSYM=>R1, STRING_SYNTAX=>R2, R5, R6) ELSE
00.00322 BEGIN
00.00323 GETCHAR(R0, R7, R6);
00.00324 IF R5 >= MAXSYMBOLLENGTH THEN
00.00325 BEGIN
00.00326 SEMANTICS(ERRORSYM=>R1, STRING_SIZE=>R2, R5, R6);
00.00327 -1=>R5;
00.00328 END ELSE
00.00329 IF R7 = STRINGCHAR THEN R0=>SYMBOLBUF[R5+1] ELSE
00.00330 BEGIN
00.00331 WHILE R7 = IGNORE DO GETCHAR(R0, R7, R6);
00.00332 IF R0 = '&' THEN
00.00333 BEGIN
00.00334 REPEAT GETCHAR(R0, R7, R6) UNTIL R7 <> IGNORE;
00.00335 IF R7 <> STRINGCHAR
00.00336 THEN SEMANTICS(ERRORSYM=>R1, STRING_SYNTAX=>R2, R5, R6);
00.00337 END;
00.00338 END;
00.00339 END;
00.00340 UNTIL R7 <> STRINGCHAR;
00.00341 STRING=>R1;
00.00342 0=>R0=>SYMBOLBUF[R5+1];
00.00343 R5=>R2;
00.00344 R0=>SYMBOLBUF[R5+1];
00.00345 END;
00.00346
00.00347 HEXCHAR:
00.00348 BEGIN
00.00349 GETCHAR(R0, R7, R6);
00.00350 0=>R2;
00.00351 WHILE R7 < DELIMITER LOGAND R0 < 'G' DO
00.00352 BEGIN
00.00353 IF R7 = NUMERIC THEN R0-'0' ELSE R0-('A'-10);
00.00354 IF R2 >= #1000 THEN SEMANTICS(ERRORSYM=>R1, CONST_OVERFLOW=>R2, R5, R6)
00.00355 ELSE R2 SHIFTLL 4 + R0;
00.00356 GETCHAR(R0, R7, R6);
00.00357 END;
00.00358 CONSTANT=>R1;
00.00359 END;
00.00360
00.00361 ESCAPE:
00.00362 BEGIN
00.00363 EMPTY=>R1;
00.00364 IGNORE=>R7=>CURRCLASS;
00.00365 END;
00.00366
00.00367
00.00368 END; "CASE"
00.00369
00.00370 SAVER0=>R0;
00.00371 SAVER3=>R3;
00.00372 SAVER4=>R4;
00.00373 SAVER5=>R5;
00.00374 SAVER6=>R6;
00.00375 SAVER7=>R7;
00.00376 SAVER6=>R6;
00.00377 EXIT(R6);
00.00378 END; "NEXTSYMBOL"
00.00379
00.00380
00.00381
00.00382 PROCEDURE TESTACCEPT
00.00383 "=================="
00.00384 (R1; "SYMBOL NO (CALL)
00.00385 "LEGAL FOLLOWERSYMBOL (RETURN)
00.00386 R0; "FOLLOWERCOUNT (RETURN)
00.00387 R3; "FOUND (RETURN), 0 = FALSE
00.00388 R4; "PARSE STATE
00.00389 R6); "LINK
00.00390 VAR
00.00391 SAVER4, SAVER5, SAVER6, SAVER7: INTEGER;
00.00392 BEGIN
00.00393 R4=>SAVER4;
00.00394 R5=>SAVER5;
00.00395 R6=>SAVER6;
00.00396 R7=>SAVER7;
00.00397 0=>R3; "SYMBOL NOT FOUND"
00.00398 0=>R7; "NO FOLLOWER SYMBOL"
00.00399 0=>R0; "LEGAL FOLLOWER COUNT"
00.00400 REPEAT
00.00401 R4@ACTIONENTRY.SYMBACTION=>R6 SHIFTRL 4; "SYMBOL NO"
00.00402 R4@ACTIONENTRY.SYMBACTION=>R5 EXTRACT 4; "ACTION"
00.00403 IF R6 = 0 THEN
00.00404 BEGIN
00.00405 IF R5 = JUMP THEN R4+R4@ACTIONENTRY.OBJECT ELSE 0=>R4;
00.00406 END ELSE
00.00407 BEGIN
00.00408 IF R6 = R1 THEN R1=>R3; "SYMBOL FOUND"
00.00409 R6=>R7;
00.00410 R0+1;
00.00411 R4+SIZE(ACTIONENTRY);
00.00412 END;
00.00413 UNTIL R4 = 0;
00.00414 R7=>R1; "FOLLOWER SYMBOL"
00.00415 SAVER4=>R4;
00.00416 SAVER5=>R5;
00.00417 SAVER6=>R6;
00.00418 SAVER7=>R7;
00.00419 EXIT(R6);
00.00420 END;
00.00421
00.00422
00.00423
00.00424 PROCEDURE RECOVER
00.00425 "==============="
00.00426 (R4; "PARSE STATE
00.00427 R5; "PARSE STACK POINTER
00.00428 R6); "LINK
00.00429 VAR
00.00430 SAVER0, SAVER1, SAVER2, SAVER3, SAVER5, SAVER6, SAVER7: INTEGER;
00.00431 BEGIN
00.00432 R0=>SAVER0;
00.00433 R1=>SAVER1;
00.00434 R2=>SAVER2;
00.00435 R3=>SAVER3;
00.00436 R5=>SAVER5;
00.00437 R6=>SAVER6;
00.00438 R7=>SAVER7;
00.00439 TABLEPTR=>R7;
00.00440 SEMANTICS(ERRORSYM=>R1, UNEXPECTED_SYMBOL=>R2, R5, R6);
00.00441 IF R7@TABLEHEAD.WINDOW2=>R1 = 0
00.00442 LOGOR R1 = R7@TABLEHEAD.WINDOW1 THEN
00.00443 BEGIN
00.00444 NEXTSYMBOL(R1, R2, R6);
00.00445 R1=>R7@TABLEHEAD.WINDOW2;
00.00446 END;
00.00447 ERRORSYM=>R0=>R7@TABLEHEAD.WINDOW1;
00.00448 R7=>R6+R7@TABLEHEAD.RECOVERSYMBOLS=>R4;
00.00449 WHILE R6@INTEGER <> R1 LOGAND R6@INTEGER <> 0 DO R6+1;
00.00450 IF R6 <> R4 LOGOR R6@INTEGER <> 0 " RECOVER SYMBOLS PRESENT " THEN
00.00451 WHILE R6@INTEGER <> R1 DO
00.00452 BEGIN
00.00453 NEXTSYMBOL(R1, R2, R6);
00.00454 R7=>R6+R7@TABLEHEAD.RECOVERSYMBOLS;
00.00455 WHILE R6@INTEGER <> R1 LOGAND R6@INTEGER <> 0 DO R6+1;
00.00456 END;
00.00457 R1=>R7@TABLEHEAD.WINDOW2;
00.00458 R5+R7@TABLEHEAD.ITEMSIZE;
00.00459 REPEAT
00.00460 R5-(R7@TABLEHEAD.ITEMSIZE=>R4)=>SAVER5;
00.00461 IF R5 >= R7@TABLEHEAD.SAVEREGS[5] THEN
00.00462 BEGIN
00.00463 R5@STACKENTRY.ACTION=>R4;
00.00464 TESTACCEPT(ERRORSYM=>R1, R0, R3, R4, R6);
00.00465 END ELSE
00.00466 BEGIN
00.00467 SEMANTICS(ERRORSYM=>R1, UNRECOVERABLE=>R2, R5, R6);
00.00468 0=>R5=>SAVER5; "TERMINATE
00.00469 END;
00.00470 UNTIL R3 <> 0 LOGOR R5 = 0;
00.00471 SAVER0=>R0;
00.00472 SAVER1=>R1;
00.00473 SAVER2=>R2;
00.00474 SAVER3=>R3;
00.00475 R5@STACKENTRY.ACTION=>R4;
00.00476 SAVER5=>R5;
00.00477 SAVER6=>R6;
00.00478 SAVER7=>R7;
00.00479 EXIT(R6);
00.00480 END;
00.00481
00.00482
00.00483
00.00484 EXPORT PROCEDURE PARSE
00.00485 "===================="
00.00486 (STACKITEMSIZE, MAXSTACKITEMS: INTEGER;
00.00487 R4; "ENTRY POINT OF SEMANTICS PROCEDURE
00.00488 R5; "PARSE STACK BASE
00.00489 R7; "PARSE TABLE PTR
00.00490 R6); "LINK
00.00491 BEGIN
00.00492 STC(6, R7+7);
00.00493 TABLEPTR=>R0=>R7@TABLEHEAD.TABLELINK;
00.00494 R7=>TABLEPTR;
00.00495 R6@PARSE.STACKITEMSIZE=>R0=>R7@TABLEHEAD.ITEMSIZE;
00.00496 R6@PARSE.MAXSTACKITEMS=>R1;
00.00497 R5=>R3;
00.00498 WHILE R1-1 >= 0 DO R3+R0;
00.00499 R3=>R7@TABLEHEAD.STACKLIMIT;
00.00500 R7=>R4+R7@TABLEHEAD.ACTIONS+SIZE(ACTIONENTRY);
00.00501 R4=>R5@STACKENTRY.ACTION;
00.00502 0=>R1=>R7@TABLEHEAD.WINDOW1;
00.00503 R1=>R7@TABLEHEAD.WINDOW2;
00.00504 R1=>R7@TABLEHEAD.RECOVERING;
00.00505 REPEAT
00.00506 R7@TABLEHEAD.WINDOW1=>R1;
00.00507 R4@ACTIONENTRY.SYMBACTION=>R3 SHIFTRL 4;
00.00508 WHILE R3 <> 0 LOGAND R1 = 0 DO
00.00509 BEGIN
00.00510 NEXTSYMBOL(R1, R2, R6);
00.00511 IF R1 = EMPTY THEN "ESCAPE"
00.00512 BEGIN
00.00513 R4=>R2; "SAVE R4
00.00514 SEMANTICS(R1, R2, R5+R7@TABLEHEAD.ITEMSIZE, R6);
00.00515 R2=>R4; "REESTABLISH R4;
00.00516 (TABLEPTR=>R7)@TABLEHEAD.ITEMSIZE=>R0;
00.00517 R5-R0;
00.00518 END;
00.00519 R1=>R7@TABLEHEAD.WINDOW1;
00.00520 R1=>R7@TABLEHEAD.WINDOW2;
00.00521 END;
00.00522 WHILE R3 <> R1 LOGAND R3 <> 0 DO
00.00523 BEGIN
00.00524 R4+SIZE(ACTIONENTRY);
00.00525 R4@ACTIONENTRY.SYMBACTION=>R3 SHIFTRL 4;
00.00526 END;
00.00527
00.00528 TABLEPTR=>R7;
00.00529 R4@ACTIONENTRY.SYMBACTION=>R6 EXTRACT 4;
00.00530 CASE R6:ACTIONTYPE OF
00.00531
00.00532 REDUCE:
00.00533 BEGIN
00.00534 R4@ACTIONENTRY.OBJECT=>R6; "TAKE PRODUCTION NUMBER"
00.00535 R6+R7+R7@TABLEHEAD.PRODUCTIONS; "TAKE PRODUCTION TABLE ENTRY"
00.00536 R6@PRODUCTIONENTRY.SYMBLENGTH=>R0 EXTRACT 4;
00.00537 R7@TABLEHEAD.ITEMSIZE=>R1;
00.00538 WHILE R0-1 <> 0 DO R5-R1; "UPDATE PARSE STACK POINTER
00.00539 R6@PRODUCTIONENTRY.SYMBLENGTH=>R0 SHIFTRL 4;
00.00540 R0=>R7@TABLEHEAD.WINDOW1;
00.00541 R4@ACTIONENTRY.OBJECT=>R1; "PRODUCTION NO"
00.00542 R1+4; "SEMANTIC ACTION NO"
00.00543 SEMANTICS(R1, R2, R5, R6);
00.00544 TABLEPTR=>R7;
00.00545 IF R1 = 5 " FINAL REDUCTION " THEN 0=>R5
00.00546 ELSE R5-(R7@TABLEHEAD.ITEMSIZE=>R0);
00.00547 R5@STACKENTRY.ACTION=>R4;
00.00548 END;
00.00549
00.00550 SHIFT:
00.00551 BEGIN
00.00552 IF R5+R7@TABLEHEAD.ITEMSIZE >= R7@TABLEHEAD.STACKLIMIT THEN
00.00553 BEGIN
00.00554 SEMANTICS(ERRORSYM=>R1, PARSESTACKFULL=>R2, R5, R6);
00.00555 0=>R5; "TERMINATE
00.00556 END ELSE
00.00557 BEGIN
00.00558 R4+R4@ACTIONENTRY.OBJECT; "NEXT ACTION"
00.00559 R4=>R5@STACKENTRY.ACTION;
00.00560 IF R1 < ERRORSYM THEN SEMANTICS(R1, R2, R5, R6);
00.00561 R5@STACKENTRY.ACTION=>R4;
00.00562 IF R7@TABLEHEAD.WINDOW2=>R0 = R7@TABLEHEAD.WINDOW1=>R1
00.00563 THEN 0=>R0=>R7@TABLEHEAD.WINDOW2;
00.00564 IF R1 = ERRORSYM THEN 1=>R0 ELSE 0=>R0;
00.00565 R0=>R7@TABLEHEAD.RECOVERING; "SET RECOVERING (TRUE OR FALSE = 1/0)"
00.00566 R7@TABLEHEAD.WINDOW2=>R0=>R7@TABLEHEAD.WINDOW1;
00.00567 END;
00.00568 END;
00.00569
00.00570 JUMP:
00.00571 BEGIN
00.00572 R4+R4@ACTIONENTRY.OBJECT;
00.00573 END;
00.00574
00.00575 FAULT:
00.00576 BEGIN
00.00577 RECOVER(R4, R5, R6);
00.00578 END;
00.00579
00.00580 END; "CASE"
00.00581 UNTIL R5 = 0;
00.00582 TABLEPTR=>R7;
00.00583 R7@TABLEHEAD.TABLELINK=>R0=>TABLEPTR;
00.00584 UNS(6, R7);
00.00585 R7-7;
00.00586 EXIT(R6, SIZE(PARSE));
00.00587 END; "PARSE"
00.00588
00.00589
00.00590 ENDMODULE
LINES: 637
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