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Lemon update 2010-01-06 13:07:31 on branch trunk

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- Fix an issue with lemon generating incorrect grammars. This issue does not effect SQLite. (user: drh)
This commit is contained in:
Randy Heit 2016-03-20 09:32:45 -05:00
parent 1c592c9601
commit 961188bc81
1 changed files with 6 additions and 4 deletions
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10
tools/lemon/lemon.c
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@ -495,6 +495,7 @@ void acttab_action(acttab *p, int lookahead, int action){
*/ */
int acttab_insert(acttab *p){ int acttab_insert(acttab *p){
int i, j, k, n; int i, j, k, n;
int nActtab; /* Number of slots in the p->aAction[] table */
assert( p->nLookahead>0 ); assert( p->nLookahead>0 );
/* Make sure we have enough space to hold the expanded action table /* Make sure we have enough space to hold the expanded action table
@ -502,7 +503,8 @@ int acttab_insert(acttab *p){
** must be appended to the current action table ** must be appended to the current action table
*/ */
n = p->mxLookahead + 1; n = p->mxLookahead + 1;
if( p->nAction + n >= p->nActionAlloc ){ nActtab = p->nAction + n;
if( nActtab >= p->nActionAlloc ){
int oldAlloc = p->nActionAlloc; int oldAlloc = p->nActionAlloc;
p->nActionAlloc = p->nAction + n + p->nActionAlloc + 20; p->nActionAlloc = p->nAction + n + p->nActionAlloc + 20;
p->aAction = realloc( p->aAction, p->aAction = realloc( p->aAction,
@ -520,11 +522,11 @@ int acttab_insert(acttab *p){
/* Scan the existing action table looking for an offset where we can /* Scan the existing action table looking for an offset where we can
** insert the current transaction set. Fall out of the loop when that ** insert the current transaction set. Fall out of the loop when that
** offset is found. In the worst case, we fall out of the loop when ** offset is found. In the worst case, we fall out of the loop when
** i reaches p->nAction, which means we append the new transaction set. ** i reaches nActtab, which means we append the new transaction set.
** **
** i is the index in p->aAction[] where p->mnLookahead is inserted. ** i is the index in p->aAction[] where p->mnLookahead is inserted.
*/ */
for(i=p->nAction-1; i>=0; i--){ for(i=nActtab-1; i>=0; i--){
/* First look for an existing action table entry that can be reused */ /* First look for an existing action table entry that can be reused */
if( p->aAction[i].lookahead==p->mnLookahead ){ if( p->aAction[i].lookahead==p->mnLookahead ){
if( p->aAction[i].action!=p->mnAction ) continue; if( p->aAction[i].action!=p->mnAction ) continue;
@ -547,7 +549,7 @@ int acttab_insert(acttab *p){
} }
if( i<0 ){ if( i<0 ){
/* If no reusable entry is found, look for an empty slot */ /* If no reusable entry is found, look for an empty slot */
for(i=0; i<p->nAction; i++){ for(i=0; i<nActtab; i++){
if( p->aAction[i].lookahead<0 ){ if( p->aAction[i].lookahead<0 ){
for(j=0; j<p->nLookahead; j++){ for(j=0; j<p->nLookahead; j++){
k = p->aLookahead[j].lookahead - p->mnLookahead + i; k = p->aLookahead[j].lookahead - p->mnLookahead + i;