database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2026-01-06 08:01:16 +03:00
Code Activity

Enhancements to lemon to generate more compact action tables and to avoid

Browse Source 
making array bounds tests that can never fail on action table calculations.

FossilOrigin-Name: 27d8e684db4651155c4bcb8bb44bf1c692b8c48b
This commit is contained in:
drh
2009-11-03 19:18:31 +00:00
parent 9a5f4d64f3
commit f16371d650
5 changed files with 75 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/lempar.c
View File

@@ -131,7 +131,6 @@ static const YYMINORTYPE yyzerominor = { 0 };
** yy_default[] Default action for each state.
*/
%%
#define YY_SZ_ACTTAB (int)(sizeof(yy_action)/sizeof(yy_action[0]))
/* The next table maps tokens into fallback tokens. If a construct
** like the following:
@@ -396,14 +395,13 @@ static int yy_find_shift_action(
int i;
int stateno = pParser->yystack[pParser->yyidx].stateno;
if( stateno>YY_SHIFT_MAX || (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
if( stateno>YY_SHIFT_COUNT
|| (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
return yy_default[stateno];
}
assert( iLookAhead!=YYNOCODE );
i += iLookAhead;
if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){
/* The user of ";" instead of "\000" as a statement terminator in SQLite
** means that we always have a look-ahead token. */
if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
if( iLookAhead>0 ){
#ifdef YYFALLBACK
YYCODETYPE iFallback; /* Fallback token */
@@ -421,7 +419,15 @@ static int yy_find_shift_action(
#ifdef YYWILDCARD
{
int j = i - iLookAhead + YYWILDCARD;
if( j>=0 && j<YY_SZ_ACTTAB && yy_lookahead[j]==YYWILDCARD ){
if(
#if YY_SHIFT_MIN+YYWILDCARD<0
j>=0 &&
#endif
#if YY_SHIFT_MAX+YYWILDCARD>=YY_ACTTAB_COUNT
j<YY_ACTTAB_COUNT &&
#endif
yy_lookahead[j]==YYWILDCARD
){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
@@ -453,22 +459,22 @@ static int yy_find_reduce_action(
){
int i;
#ifdef YYERRORSYMBOL
if( stateno>YY_REDUCE_MAX ){
if( stateno>YY_REDUCE_COUNT ){
return yy_default[stateno];
}
#else
assert( stateno<=YY_REDUCE_MAX );
assert( stateno<=YY_REDUCE_COUNT );
#endif
i = yy_reduce_ofst[stateno];
assert( i!=YY_REDUCE_USE_DFLT );
assert( iLookAhead!=YYNOCODE );
i += iLookAhead;
#ifdef YYERRORSYMBOL
if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){
if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
return yy_default[stateno];
}
#else
assert( i>=0 && i<YY_SZ_ACTTAB );
assert( i>=0 && i<YY_ACTTAB_COUNT );
assert( yy_lookahead[i]==iLookAhead );
#endif
return yy_action[i];