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r=norris 

Moved 'ok' to MatchState. Re-wrote matchGreedyKid to reduce stack
usage and allow succesful completion to propagate out. #9141
This commit is contained in:
rogerl%netscape.com 1999-11-29 22:06:22 +00:00
Родитель 44bfeef78a
Коммит 50b2e1ebdf
1 изменённых файлов: 72 добавлений и 67 удалений
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139
js/src/jsregexp.c
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@ -1247,6 +1247,7 @@ typedef struct MatchState {
uintN parenCount; /* number of paren substring matches */
JSSubString *maybeParens; /* possible paren substring pointers */
JSSubString *parens; /* certain paren substring matches */
JSBool ok; /* indicates runtime error during matching */
} MatchState;
/*
@ -1267,57 +1268,69 @@ static JSBool matchChar(int flags, jschar c, jschar c2)
}
static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
const jschar *cp, JSBool *ok);
const jschar *cp);
static const jschar *matchGreedyKid(MatchState *state, RENode *ren,
int kidCount, int maxKid,
const jschar *cp, const jschar *previousKid, JSBool *ok)
typedef struct {
MatchState *state;
RENode *kid;
RENode *next;
RENode *stop;
int kidCount;
int maxKid;
} GreedyState;
static const jschar *greedyRecurse(GreedyState *grState, const jschar *cp, const jschar *previousKid)
{
const jschar *kidMatch;
const jschar *match;
kidMatch = matchRENodes(state, (RENode *)ren->kid, ren->next, cp, ok);
kidMatch = matchRENodes(grState->state, grState->kid, grState->next, cp);
if (kidMatch == NULL) {
match = matchRENodes(state, ren->next, NULL, cp, ok);
if (match == NULL)
return NULL;
else {
if (previousKid != NULL)
matchRENodes(state, (RENode *)ren->kid, ren->next, previousKid, ok);
return cp;
}
if (previousKid != NULL)
matchRENodes(grState->state, grState->kid, grState->next, previousKid);
return matchRENodes(grState->state, grState->next, grState->stop, cp);
}
else {
if (kidMatch == cp) return kidMatch; /* no point pursuing an empty match forever */
if ((maxKid == 0) || (++kidCount < maxKid)) {
match = matchGreedyKid(state, ren, kidCount, maxKid, kidMatch, cp, ok);
if ((grState->maxKid == 0) || (++grState->kidCount < grState->maxKid)) {
match = greedyRecurse(grState, kidMatch, cp);
--grState->kidCount;
if (match != NULL) return match;
}
match = matchRENodes(state, ren->next, NULL, kidMatch, ok);
if (match != NULL) {
matchRENodes(state, (RENode *)ren->kid, ren->next, cp, ok);
return kidMatch;
}
else
return NULL;
matchRENodes(grState->state, grState->kid, grState->next, cp);
return matchRENodes(grState->state, grState->next, grState->stop, kidMatch);
}
}
static const jschar *matchGreedyKid(MatchState *state, RENode *ren, RENode *stop,
int kidCount, const jschar *cp, const jschar *previousKid)
{
GreedyState grState;
grState.state = state;
grState.kid = (RENode *)ren->kid;
grState.next = ren->next;
grState.stop = stop;
grState.kidCount = kidCount;
grState.maxKid = (ren->op == REOP_QUANT) ? ren->u.range.max : 0;
return greedyRecurse(&grState, cp, previousKid);
}
static const jschar *matchNonGreedyKid(MatchState *state, RENode *ren,
int kidCount, int maxKid,
const jschar *cp, JSBool *ok)
const jschar *cp)
{
const jschar *kidMatch;
const jschar *match;
match = matchRENodes(state, ren->next, NULL, cp, ok);
match = matchRENodes(state, ren->next, NULL, cp);
if (match != NULL) return cp;
kidMatch = matchRENodes(state, (RENode *)ren->kid, ren->next, cp, ok);
kidMatch = matchRENodes(state, (RENode *)ren->kid, ren->next, cp);
if (kidMatch == NULL)
return NULL;
else {
if (kidMatch == cp) return kidMatch; /* no point pursuing an empty match forever */
return matchNonGreedyKid(state, ren, kidCount, maxKid, kidMatch, ok);
return matchNonGreedyKid(state, ren, kidCount, maxKid, kidMatch);
}
}
@ -1567,7 +1580,7 @@ static JSBool buildBitmap(MatchState *state, RENode *ren)
}
static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
const jschar *cp, JSBool *ok)
const jschar *cp)
{
const jschar *cp2, *kidMatch, *lastKid, *source, *cpend = state->cpend;
jschar c;
@ -1584,68 +1597,60 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
ren = (RENode *)ren->kid;
continue;
}
kidMatch = matchRENodes(state, (RENode *)ren->kid, stop, cp, ok);
kidMatch = matchRENodes(state, (RENode *)ren->kid, stop, cp);
if (kidMatch != NULL) return kidMatch;
break;
case REOP_QUANT:
lastKid = NULL;
for (num = 0; num < ren->u.range.min; num++) {
kidMatch = matchRENodes(state, (RENode *)ren->kid,
ren->next, cp, ok);
ren->next, cp);
if (kidMatch == NULL)
return NULL;
lastKid = cp;
cp = kidMatch;
}
if (num == ren->u.range.max) break;
if ((ren->flags & RENODE_MINIMAL) == 0)
cp = matchGreedyKid(state, ren, num,
ren->u.range.max, cp, lastKid, ok);
else
cp = matchNonGreedyKid(state, ren, num,
ren->u.range.max, cp, ok);
if ((ren->flags & RENODE_MINIMAL) == 0) {
kidMatch = matchGreedyKid(state, ren, stop, num, cp, lastKid);
return kidMatch;
}
cp = matchNonGreedyKid(state, ren, num,
ren->u.range.max, cp);
if (cp == NULL) return NULL;
break;
case REOP_PLUS:
kidMatch = matchRENodes(state, (RENode *)ren->kid,
ren->next, cp, ok);
ren->next, cp);
if (kidMatch == NULL)
return NULL;
if ((ren->flags & RENODE_MINIMAL) == 0) {
cp = matchGreedyKid(state, ren, 1, 0, cp, NULL, ok);
if (cp == NULL) return NULL;
}
else {
cp = matchNonGreedyKid(state, ren, 1, 0, kidMatch, ok);
if (cp == NULL) return NULL;
}
if ((ren->flags & RENODE_MINIMAL) == 0)
return matchGreedyKid(state, ren, stop, 1, cp, NULL);
cp = matchNonGreedyKid(state, ren, 1, 0, kidMatch);
if (cp == NULL) return NULL;
break;
case REOP_STAR:
if ((ren->flags & RENODE_MINIMAL) == 0) {
cp = matchGreedyKid(state, ren, 0, 0, cp, NULL, ok);
if (cp == NULL) return NULL;
}
else {
cp = matchNonGreedyKid(state, ren, 0, 0, cp, ok);
if (cp == NULL) return NULL;
}
if ((ren->flags & RENODE_MINIMAL) == 0)
return matchGreedyKid(state, ren, stop, 0, cp, NULL);
cp = matchNonGreedyKid(state, ren, 0, 0, cp);
if (cp == NULL) return NULL;
break;
case REOP_OPT:
num = state->parenCount;
if (ren->flags & RENODE_MINIMAL) {
const jschar *restMatch = matchRENodes(state, ren->next,
stop, cp, ok);
stop, cp);
if (restMatch != NULL) return restMatch;
}
kidMatch = matchRENodes(state, (RENode *)ren->kid,
ren->next, cp, ok);
ren->next, cp);
if (kidMatch == NULL) {
state->parenCount = num;
break;
}
else {
const jschar *restMatch = matchRENodes(state, ren->next,
stop, kidMatch, ok);
stop, kidMatch);
if (restMatch == NULL) {
/* need to undo the result of running the kid */
state->parenCount = num;
@ -1675,12 +1680,12 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
break;
case REOP_ASSERT:
kidMatch = matchRENodes(state, (RENode *)ren->kid,
ren->next, cp, ok);
ren->next, cp);
if (kidMatch == NULL) return NULL;
break;
case REOP_ASSERT_NOT:
kidMatch = matchRENodes(state, (RENode *)ren->kid,
ren->next, cp, ok);
ren->next, cp);
if (kidMatch != NULL) return NULL;
break;
case REOP_BACKREF:
@ -1688,7 +1693,7 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
if (num >= state->parenCount) {
JS_ReportErrorNumber(state->context, js_GetErrorMessage, NULL,
JSMSG_BAD_BACKREF);
*ok = JS_FALSE;
state->ok = JS_FALSE;
return NULL;
}
parsub = &state->parens[num];
@ -1706,7 +1711,7 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
if (cp != cpend) {
if (ren->u.ucclass.bitmap == NULL) {
if (!buildBitmap(state, ren)) {
*ok = JS_FALSE;
state->ok = JS_FALSE;
return NULL;
}
}
@ -1740,7 +1745,7 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
case REOP_DOTSTARMIN:
for (cp2 = cp; cp2 < cpend; cp2++) {
const jschar *cp3 = matchRENodes(state, ren->next,
stop, cp2, ok);
stop, cp2);
if (cp3 != NULL) return cp3;
if (*cp2 == '\n')
return NULL;
@ -1752,7 +1757,7 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
break;
while (cp2 >= cp) {
const jschar *cp3 = matchRENodes(state, ren->next,
stop, cp2, ok);
stop, cp2);
if (cp3 != NULL)
return cp3;
cp2--;
@ -1869,7 +1874,7 @@ static const jschar *matchRENodes(MatchState *state, RENode *ren, RENode *stop,
}
static const jschar *
MatchRegExp(MatchState *state, RENode *ren, const jschar *cp, JSBool *ok)
MatchRegExp(MatchState *state, RENode *ren, const jschar *cp)
{
const jschar *cp2, *cp3;
/* have to include the position beyond the last character
@ -1877,8 +1882,8 @@ MatchRegExp(MatchState *state, RENode *ren, const jschar *cp, JSBool *ok)
for (cp2 = cp; cp2 <= state->cpend; cp2++) {
state->skipped = cp2 - cp;
state->parenCount = 0;
cp3 = matchRENodes(state, ren, NULL, cp2, ok);
if (!*ok) return NULL;
cp3 = matchRENodes(state, ren, NULL, cp2);
if (!state->ok) return NULL;
if (cp3 != NULL)
return cp3;
}
@ -1938,14 +1943,14 @@ js_ExecuteRegExp(JSContext *cx, JSRegExp *re, JSString *str, size_t *indexp,
state.parenCount = 0;
state.maybeParens = parsub;
state.parens = parsub + re->parenCount;
ok = JS_TRUE;
state.ok = JS_TRUE;
/*
* Call the recursive matcher to do the real work. Return null on mismatch
* whether testing or not. On match, return an extended Array object.
*/
cp = MatchRegExp(&state, re->ren, cp, &ok);
if (!ok) goto out;
cp = MatchRegExp(&state, re->ren, cp);
if (!(ok = state.ok)) goto out;
if (!cp) {
*rval = JSVAL_NULL;
goto out;