mirror of https://github.com/ZDoom/gzdoom-gles.git
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
|
|
@ -170,9 +170,13 @@ static const YYCODETYPE yyFallback[] = {
|
|||
** + The semantic value stored at this level of the stack. This is
|
||||
** the information used by the action routines in the grammar.
|
||||
** It is sometimes called the "minor" token.
|
||||
**
|
||||
** After the "shift" half of a SHIFTREDUCE action, the stateno field
|
||||
** actually contains the reduce action for the second half of the
|
||||
** SHIFTREDUCE.
|
||||
*/
|
||||
struct yyStackEntry {
|
||||
YYACTIONTYPE stateno; /* The state-number */
|
||||
YYACTIONTYPE stateno; /* The state-number, or reduce action in SHIFTREDUCE */
|
||||
YYCODETYPE major; /* The major token value. This is the code
|
||||
** number for the token at this stack level */
|
||||
YYMINORTYPE minor; /* The user-supplied minor token value. This
|
||||
|
|
@ -400,7 +404,8 @@ static int yy_find_shift_action(
|
|||
){
|
||||
int i;
|
||||
int stateno = pParser->yystack[pParser->yyidx].stateno;
|
||||
|
||||
|
||||
if( stateno>=YY_MIN_REDUCE ) return stateno;
|
||||
if( stateno>YY_SHIFT_COUNT
|
||||
|| (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
|
||||
return yy_default[stateno];
|
||||
|
|
@ -504,10 +509,32 @@ static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
|
|||
ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
|
||||
}
|
||||
|
||||
/*
|
||||
** Print tracing information for a SHIFT action
|
||||
*/
|
||||
#ifndef NDEBUG
|
||||
static void yyTraceShift(yyParser *yypParser, int yyNewState){
|
||||
if( yyTraceFILE ){
|
||||
int i;
|
||||
if( yyNewState<YYNSTATE ){
|
||||
fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
|
||||
fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
|
||||
for(i=1; i<=yypParser->yyidx; i++)
|
||||
fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
|
||||
fprintf(yyTraceFILE,"\n");
|
||||
}else{
|
||||
fprintf(yyTraceFILE,"%sShift *\n",yyTracePrompt);
|
||||
}
|
||||
}
|
||||
}
|
||||
#else
|
||||
# define yyTraceShift(X,Y)
|
||||
#endif
|
||||
|
||||
/*
|
||||
** Perform a shift action. Return the number of errors.
|
||||
*/
|
||||
static int yy_shift(
|
||||
static void yy_shift(
|
||||
yyParser *yypParser, /* The parser to be shifted */
|
||||
int yyNewState, /* The new state to shift in */
|
||||
int yyMajor, /* The major token to shift in */
|
||||
|
|
@ -523,14 +550,14 @@ static int yy_shift(
|
|||
#if YYSTACKDEPTH>0
|
||||
if( yypParser->yyidx>=YYSTACKDEPTH ){
|
||||
yyStackOverflow(yypParser, yypMinor);
|
||||
return 1;
|
||||
return;
|
||||
}
|
||||
#else
|
||||
if( yypParser->yyidx>=yypParser->yystksz ){
|
||||
yyGrowStack(yypParser);
|
||||
if( yypParser->yyidx>=yypParser->yystksz ){
|
||||
yyStackOverflow(yypParser, yypMinor);
|
||||
return 1;
|
||||
return;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
|
@ -538,21 +565,7 @@ static int yy_shift(
|
|||
yytos->stateno = (YYACTIONTYPE)yyNewState;
|
||||
yytos->major = (YYCODETYPE)yyMajor;
|
||||
yytos->minor = *yypMinor;
|
||||
#ifndef NDEBUG
|
||||
if( yyTraceFILE && yypParser->yyidx>0 ){
|
||||
int i;
|
||||
if( yyNewState<YYNSTATE ){
|
||||
fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
|
||||
fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
|
||||
for(i=1; i<=yypParser->yyidx; i++)
|
||||
fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
|
||||
fprintf(yyTraceFILE,"\n");
|
||||
}else{
|
||||
fprintf(yyTraceFILE,"%sShift *\n",yyTracePrompt);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
return 0;
|
||||
yyTraceShift(yypParser, yyNewState);
|
||||
}
|
||||
|
||||
/* The following table contains information about every rule that
|
||||
|
|
@ -623,7 +636,8 @@ static void yy_reduce(
|
|||
yysize = yyRuleInfo[yyruleno].nrhs;
|
||||
yypParser->yyidx -= yysize;
|
||||
yyact = yy_find_reduce_action(yymsp[-yysize].stateno,(YYCODETYPE)yygoto);
|
||||
if( yyact < YY_MAX_SHIFTREDUCE ){
|
||||
if( yyact <= YY_MAX_SHIFTREDUCE ){
|
||||
if( yyact>YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
|
||||
/* If 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().
|
||||
|
|
@ -634,16 +648,9 @@ static void yy_reduce(
|
|||
yymsp->stateno = (YYACTIONTYPE)yyact;
|
||||
yymsp->major = (YYCODETYPE)yygoto;
|
||||
yymsp->minor = yygotominor;
|
||||
#ifndef NDEBUG
|
||||
if( yyTraceFILE ){
|
||||
fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyact);
|
||||
}
|
||||
#endif
|
||||
yyTraceShift(yypParser, yyact);
|
||||
}else{
|
||||
if( yy_shift(yypParser,yyact,yygoto,&yygotominor) ) yyact = 0;
|
||||
}
|
||||
if( yyact>=YY_MIN_SHIFTREDUCE ){
|
||||
yy_reduce(yypParser, yyact - YY_MIN_SHIFTREDUCE);
|
||||
yy_shift(yypParser,yyact,yygoto,&yygotominor);
|
||||
}
|
||||
}else{
|
||||
assert( yyact == YY_ACCEPT_ACTION );
|
||||
|
|
@ -767,13 +774,10 @@ void Parse(
|
|||
do{
|
||||
yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor);
|
||||
if( yyact <= YY_MAX_SHIFTREDUCE ){
|
||||
if( yy_shift(yypParser,yyact,yymajor,&yyminorunion)==0 ){
|
||||
yypParser->yyerrcnt--;
|
||||
yymajor = YYNOCODE;
|
||||
if( yyact > YY_MAX_SHIFT ){
|
||||
yy_reduce(yypParser, yyact-YY_MIN_SHIFTREDUCE);
|
||||
}
|
||||
}
|
||||
if( yyact > YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
|
||||
yy_shift(yypParser,yyact,yymajor,&yyminorunion);
|
||||
yypParser->yyerrcnt--;
|
||||
yymajor = YYNOCODE;
|
||||
}else if( yyact <= YY_MAX_REDUCE ){
|
||||
yy_reduce(yypParser,yyact-YY_MIN_REDUCE);
|
||||
}else{
|
||||
|
|
|
|||
Loading…
Reference in New Issue