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Overview
Comment:More performance tweaking in the parser. (CVS 2302)
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SHA1: a3d12726bb7bce72b8266236800c07f22ac5212f
User & Date: drh 2005-02-01 04:09:37.000
Context
2005-02-01
10:35
Have debugging code handle sqliteMalloc(n) where n<0 in the same way as production. (CVS 2303) (check-in: ab85e1d012 user: danielk1977 tags: trunk)
04:09
More performance tweaking in the parser. (CVS 2302) (check-in: a3d12726bb user: drh tags: trunk)
03:46
Fix an error introduced with (2299). (CVS 2301) (check-in: 22041d5f26 user: danielk1977 tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to tool/lempar.c.
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** look-ahead token iLookAhead.
**
** If the look-ahead token is YYNOCODE, then check to see if the action is
** independent of the look-ahead.  If it is, return the action, otherwise
** return YY_NO_ACTION.
*/
static int yy_find_reduce_action(
  yyParser *pParser,        /* The parser */
  int iLookAhead            /* The look-ahead token */
){
  int i;
  int stateno = pParser->yystack[pParser->yyidx].stateno;
 
  i = yy_reduce_ofst[stateno];
  if( i==YY_REDUCE_USE_DFLT ){
    return yy_default[stateno];
  }
  if( iLookAhead==YYNOCODE ){
    return YY_NO_ACTION;








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** look-ahead token iLookAhead.
**
** If the look-ahead token is YYNOCODE, then check to see if the action is
** independent of the look-ahead.  If it is, return the action, otherwise
** return YY_NO_ACTION.
*/
static int yy_find_reduce_action(
  int stateno,              /* Current state number */
  int iLookAhead            /* The look-ahead token */
){
  int i;
  /* int stateno = pParser->yystack[pParser->yyidx].stateno; */
 
  i = yy_reduce_ofst[stateno];
  if( i==YY_REDUCE_USE_DFLT ){
    return yy_default[stateno];
  }
  if( iLookAhead==YYNOCODE ){
    return YY_NO_ACTION;
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  **     break;
  */
%%
  };
  yygoto = yyRuleInfo[yyruleno].lhs;
  yysize = yyRuleInfo[yyruleno].nrhs;
  yypParser->yyidx -= yysize;
  yyact = yy_find_reduce_action(yypParser,yygoto);
  if( yyact < YYNSTATE ){
#ifdef NDEBUG
    /* If we are not debugging and the reduce action popped at least
    ** one element off the stack, then we can push the new element back
    ** onto the stack here, and skip the stack overflow test in yy_shift().
    ** That gives a significant speed improvement. */
    if( yysize ){








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  **     break;
  */
%%
  };
  yygoto = yyRuleInfo[yyruleno].lhs;
  yysize = yyRuleInfo[yyruleno].nrhs;
  yypParser->yyidx -= yysize;
  yyact = yy_find_reduce_action(yymsp[-yysize].stateno,yygoto);
  if( yyact < YYNSTATE ){
#ifdef NDEBUG
    /* If we are not debugging and the reduce action popped at least
    ** one element off the stack, then we can push the new element back
    ** onto the stack here, and skip the stack overflow test in yy_shift().
    ** That gives a significant speed improvement. */
    if( yysize ){
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