SQLite

Check-in [9235b0cf6a]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Improve the Lemon parser template (lempar.c) so that it avoids unnecessary work when the grammer defines YYNOERRORRECOVERY (as SQLite does). Slightly smaller and faster code results.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 9235b0cf6a37712ae9e5deeb1e5ee064dd5511fa
User & Date: drh 2016-02-16 01:01:43.571
Context
2016-02-16
13:04
Minor simplification to the tokenizer. Slightly smaller and faster. (check-in: 9570b6b43d user: drh tags: trunk)
01:01
Improve the Lemon parser template (lempar.c) so that it avoids unnecessary work when the grammer defines YYNOERRORRECOVERY (as SQLite does). Slightly smaller and faster code results. (check-in: 9235b0cf6a user: drh tags: trunk)
2016-02-15
23:46
Fix a harmless compiler warning in FTS5. (check-in: e52c90758c user: drh tags: trunk)
Changes
Side-by-Side Diff Ignore Whitespace Patch
Changes to tool/lempar.c.
︙
207
208
209
210
211
212
213

214

215
216
217
218
219
220
221

207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223








+

+








/* The state of the parser is completely contained in an instance of
** the following structure */
struct yyParser {
  int yyidx;                    /* Index of top element in stack */
#ifdef YYTRACKMAXSTACKDEPTH
  int yyidxMax;                 /* Maximum value of yyidx */
#endif
#ifndef YYNOERRORRECOVERY
  int yyerrcnt;                 /* Shifts left before out of the error */
#endif
  ParseARG_SDECL                /* A place to hold %extra_argument */
#if YYSTACKDEPTH<=0
  int yystksz;                  /* Current side of the stack */
  yyStackEntry *yystack;        /* The parser's stack */
#else
  yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
#endif
︙
770
771
772
773
774
775
776

777

778
779
780
781
782
783
784

772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788








+

+








      /*memset(&yyminorunion, 0, sizeof(yyminorunion));*/
      yyminorunion = yyzerominor;
      yyStackOverflow(yypParser, &yyminorunion);
      return;
    }
#endif
    yypParser->yyidx = 0;
#ifndef YYNOERRORRECOVERY
    yypParser->yyerrcnt = -1;
#endif
    yypParser->yystack[0].stateno = 0;
    yypParser->yystack[0].major = 0;
#ifndef NDEBUG
    if( yyTraceFILE ){
      fprintf(yyTraceFILE,"%sInitialize. Empty stack. State 0\n",
              yyTracePrompt);
    }
︙
797
798
799
800
801
802
803

804

805
806
807
808
809
810
811

801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817








+

+








#endif

  do{
    yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor);
    if( yyact <= YY_MAX_SHIFTREDUCE ){
      if( yyact > YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
      yy_shift(yypParser,yyact,yymajor,&yyminorunion);
#ifndef YYNOERRORRECOVERY
      yypParser->yyerrcnt--;
#endif
      yymajor = YYNOCODE;
    }else if( yyact <= YY_MAX_REDUCE ){
      yy_reduce(yypParser,yyact-YY_MIN_REDUCE);
    }else{
      assert( yyact == YY_ERROR_ACTION );
#ifdef YYERRORSYMBOL
      int yymx;
︙