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Lemon update 2015-09-07 19:52:55 on branch lemon-update
- Change the parser engine so that it (once again) waits for a lookahead token before reducing, even in a SHIFTREDUCE action. (user: drh)
This commit is contained in:
Randy Heit
parent
3d5867d29e
commit
fd3507c4c3
1 changed files with 41 additions and 37 deletions
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@ -170,9 +170,13 @@ static const YYCODETYPE yyFallback[] = {
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** + The semantic value stored at this level of the stack. This is
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** the information used by the action routines in the grammar.
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** It is sometimes called the "minor" token.
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**
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** After the "shift" half of a SHIFTREDUCE action, the stateno field
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** actually contains the reduce action for the second half of the
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** SHIFTREDUCE.
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*/
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struct yyStackEntry {
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YYACTIONTYPE stateno; /* The state-number */
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YYACTIONTYPE stateno; /* The state-number, or reduce action in SHIFTREDUCE */
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YYCODETYPE major; /* The major token value. This is the code
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** number for the token at this stack level */
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YYMINORTYPE minor; /* The user-supplied minor token value. This
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@ -401,6 +405,7 @@ static int yy_find_shift_action(
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int i;
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int stateno = pParser->yystack[pParser->yyidx].stateno;
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if( stateno>=YY_MIN_REDUCE ) return stateno;
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if( stateno>YY_SHIFT_COUNT
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|| (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
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return yy_default[stateno];
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@ -504,10 +509,32 @@ static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
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ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
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}
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/*
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** Print tracing information for a SHIFT action
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*/
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#ifndef NDEBUG
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static void yyTraceShift(yyParser *yypParser, int yyNewState){
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if( yyTraceFILE ){
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int i;
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if( yyNewState<YYNSTATE ){
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fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
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fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
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for(i=1; i<=yypParser->yyidx; i++)
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fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
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fprintf(yyTraceFILE,"\n");
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}else{
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fprintf(yyTraceFILE,"%sShift *\n",yyTracePrompt);
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}
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}
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}
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#else
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# define yyTraceShift(X,Y)
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#endif
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/*
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** Perform a shift action. Return the number of errors.
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*/
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static int yy_shift(
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static void yy_shift(
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yyParser *yypParser, /* The parser to be shifted */
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int yyNewState, /* The new state to shift in */
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int yyMajor, /* The major token to shift in */
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@ -523,14 +550,14 @@ static int yy_shift(
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#if YYSTACKDEPTH>0
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if( yypParser->yyidx>=YYSTACKDEPTH ){
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yyStackOverflow(yypParser, yypMinor);
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return 1;
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return;
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}
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#else
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if( yypParser->yyidx>=yypParser->yystksz ){
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yyGrowStack(yypParser);
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if( yypParser->yyidx>=yypParser->yystksz ){
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yyStackOverflow(yypParser, yypMinor);
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return 1;
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return;
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}
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}
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#endif
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@ -538,21 +565,7 @@ static int yy_shift(
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yytos->stateno = (YYACTIONTYPE)yyNewState;
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yytos->major = (YYCODETYPE)yyMajor;
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yytos->minor = *yypMinor;
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#ifndef NDEBUG
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if( yyTraceFILE && yypParser->yyidx>0 ){
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int i;
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if( yyNewState<YYNSTATE ){
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fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
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fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
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for(i=1; i<=yypParser->yyidx; i++)
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fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
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fprintf(yyTraceFILE,"\n");
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}else{
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fprintf(yyTraceFILE,"%sShift *\n",yyTracePrompt);
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}
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}
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#endif
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return 0;
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yyTraceShift(yypParser, yyNewState);
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}
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/* The following table contains information about every rule that
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@ -623,7 +636,8 @@ static void yy_reduce(
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yysize = yyRuleInfo[yyruleno].nrhs;
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yypParser->yyidx -= yysize;
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yyact = yy_find_reduce_action(yymsp[-yysize].stateno,(YYCODETYPE)yygoto);
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if( yyact < YY_MAX_SHIFTREDUCE ){
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if( yyact <= YY_MAX_SHIFTREDUCE ){
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if( yyact>YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
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/* If the reduce action popped at least
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** one element off the stack, then we can push the new element back
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** onto the stack here, and skip the stack overflow test in yy_shift().
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@ -634,16 +648,9 @@ static void yy_reduce(
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yymsp->stateno = (YYACTIONTYPE)yyact;
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yymsp->major = (YYCODETYPE)yygoto;
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yymsp->minor = yygotominor;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyact);
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}
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#endif
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yyTraceShift(yypParser, yyact);
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}else{
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if( yy_shift(yypParser,yyact,yygoto,&yygotominor) ) yyact = 0;
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}
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if( yyact>=YY_MIN_SHIFTREDUCE ){
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yy_reduce(yypParser, yyact - YY_MIN_SHIFTREDUCE);
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yy_shift(yypParser,yyact,yygoto,&yygotominor);
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}
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}else{
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assert( yyact == YY_ACCEPT_ACTION );
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@ -767,13 +774,10 @@ void Parse(
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do{
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yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor);
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if( yyact <= YY_MAX_SHIFTREDUCE ){
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if( yy_shift(yypParser,yyact,yymajor,&yyminorunion)==0 ){
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yypParser->yyerrcnt--;
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yymajor = YYNOCODE;
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if( yyact > YY_MAX_SHIFT ){
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yy_reduce(yypParser, yyact-YY_MIN_SHIFTREDUCE);
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}
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}
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if( yyact > YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
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yy_shift(yypParser,yyact,yymajor,&yyminorunion);
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yypParser->yyerrcnt--;
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yymajor = YYNOCODE;
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}else if( yyact <= YY_MAX_REDUCE ){
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yy_reduce(yypParser,yyact-YY_MIN_REDUCE);
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}else{
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