本文整理汇总了C++中ParseNode::isUsed方法的典型用法代码示例。如果您正苦于以下问题：C++ ParseNode::isUsed方法的具体用法？C++ ParseNode::isUsed怎么用？C++ ParseNode::isUsed使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ParseNode的用法示例。
在下文中一共展示了ParseNode::isUsed方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: while
/* See comment on member function declaration. */
bool
TreeContext::define(JSContext *cx, PropertyName *name, ParseNode *pn, Definition::Kind kind)
{
JS_ASSERT(!pn->isUsed());
JS_ASSERT_IF(pn->isDefn(), pn->isPlaceholder());
Definition *prevDef = NULL;
if (kind == Definition::LET)
prevDef = decls_.lookupFirst(name);
else
JS_ASSERT(!decls_.lookupFirst(name));
if (!prevDef)
prevDef = lexdeps.lookupDefn(name);
if (prevDef) {
ParseNode **pnup = &prevDef->dn_uses;
ParseNode *pnu;
unsigned start = (kind == Definition::LET) ? pn->pn_blockid : bodyid;
while ((pnu = *pnup) != NULL && pnu->pn_blockid >= start) {
JS_ASSERT(pnu->pn_blockid >= bodyid);
JS_ASSERT(pnu->isUsed());
pnu->pn_lexdef = (Definition *) pn;
pn->pn_dflags |= pnu->pn_dflags & PND_USE2DEF_FLAGS;
pnup = &pnu->pn_link;
}
if (!pnu || pnu != prevDef->dn_uses) {
*pnup = pn->dn_uses;
pn->dn_uses = prevDef->dn_uses;
prevDef->dn_uses = pnu;
if (!pnu && prevDef->isPlaceholder())
lexdeps->remove(name);
}
pn->pn_dflags |= prevDef->pn_dflags & PND_CLOSED;
}
JS_ASSERT_IF(kind != Definition::LET, !lexdeps->lookup(name));
pn->setDefn(true);
pn->pn_dflags &= ~PND_PLACEHOLDER;
if (kind == Definition::CONST)
pn->pn_dflags |= PND_CONST;
Definition *dn = (Definition *)pn;
switch (kind) {
case Definition::ARG:
JS_ASSERT(sc->inFunction());
dn->setOp(JSOP_GETARG);
dn->pn_dflags |= PND_BOUND;
if (!dn->pn_cookie.set(cx, staticLevel, args_.length()))
return false;
if (!args_.append(dn))
return false;
if (name == cx->runtime->atomState.emptyAtom)
break;
if (!decls_.addUnique(name, dn))
return false;
break;
case Definition::CONST:
case Definition::VAR:
if (sc->inFunction()) {
dn->setOp(JSOP_GETLOCAL);
dn->pn_dflags |= PND_BOUND;
if (!dn->pn_cookie.set(cx, staticLevel, vars_.length()))
return false;
if (!vars_.append(dn))
return false;
}
if (!decls_.addUnique(name, dn))
return false;
break;
case Definition::LET:
dn->setOp(JSOP_GETLOCAL);
dn->pn_dflags |= (PND_LET | PND_BOUND);
JS_ASSERT(dn->pn_cookie.level() == staticLevel); /* see BindLet */
if (!decls_.addShadow(name, dn))
return false;
break;
case Definition::PLACEHOLDER:
case Definition::NAMED_LAMBDA:
JS_NOT_REACHED("unexpected kind");
break;
}
return true;
}