drastically improve lupdate's scalability

do not import all data from included files into the current file (which
turned out to be extremely expensive for 3rdparty/webkit), but do
hierarchical lookups on demand. this makes the lookups as such much
slower, of course, but it still pays off.

1 files changed, 280 insertions, 197 deletions

diff --git a/tools/linguist/lupdate/cpp.cpp b/tools/linguist/lupdate/cpp.cpp
index d5d2e10a5f..c9b25f37c8 100644
--- a/tools/linguist/lupdate/cpp.cpp
+++ b/tools/linguist/lupdate/cpp.cpp
@@ -43,6 +43,7 @@
 
 #include <translator.h>
 
+#include <QtCore/QBitArray>
 #include <QtCore/QDebug>
 #include <QtCore/QFileInfo>
 #include <QtCore/QStack>
@@ -62,53 +63,110 @@ static QString MagicComment(QLatin1String("TRANSLATOR"));
 
 //#define DIAGNOSE_RETRANSLATABILITY // FIXME: should make a runtime option of this
 
-uint qHash(const QStringList &qsl)
+class HashString {
+public:
+    HashString() : m_hashed(false) {}
+    explicit HashString(const QString &str) : m_str(str), m_hashed(false) {}
+    void setValue(const QString &str) { m_str = str; m_hashed = false; }
+    const QString &value() const { return m_str; }
+    bool operator==(const HashString &other) const { return m_str == other.m_str; }
+private:
+    QString m_str;
+    mutable uint m_hash;
+    mutable bool m_hashed;
+    friend uint qHash(const HashString &str);
+};
+
+uint qHash(const HashString &str)
+{
+    if (!str.m_hashed) {
+        str.m_hashed = true;
+        str.m_hash = qHash(str.m_str);
+    }
+    return str.m_hash;
+}
+
+class HashStringList {
+public:
+    explicit HashStringList(const QList<HashString> &list) : m_list(list), m_hashed(false) {}
+    const QList<HashString> &value() const { return m_list; }
+    bool operator==(const HashStringList &other) const { return m_list == other.m_list; }
+private:
+    QList<HashString> m_list;
+    mutable uint m_hash;
+    mutable bool m_hashed;
+    friend uint qHash(const HashStringList &list);
+};
+
+uint qHash(const HashStringList &list)
 {
-    uint hash = 0;
-    foreach (const QString &qs, qsl) {
-        hash ^= qHash(qs) ^ 0xa09df22f;
-        hash = (hash << 13) | (hash >> 19);
+    if (!list.m_hashed) {
+        list.m_hashed = true;
+        uint hash = 0;
+        foreach (const HashString &qs, list.m_list) {
+            hash ^= qHash(qs) ^ 0xa09df22f;
+            hash = (hash << 13) | (hash >> 19);
+        }
+        list.m_hash = hash;
     }
-    return hash;
+    return list.m_hash;
 }
 
+typedef QList<HashString> NamespaceList;
+
 struct Namespace {
 
     Namespace() :
-            isClass(false),
+            classDef(0),
             hasTrFunctions(false), complained(false)
     {}
 
-    QString name;
-    QMap<QString, Namespace *> children;
-    QMap<QString, QStringList> aliases;
-    QSet<QStringList> usings;
-
-    int fileId;
+    QHash<HashString, Namespace *> children;
+    QHash<HashString, NamespaceList> aliases;
+    QList<HashStringList> usings;
 
-    bool isClass;
+    // Class declarations set no flags and create no namespaces, so they are ignored.
+    // Class definitions may appear multiple times - but only because we are trying to
+    // "compile" all sources irrespective of build configuration.
+    // Nested classes may be forward-declared inside a definition, and defined in another file.
+    // The latter will detach the class' child list, so clones need a backlink to the original
+    // definition (either one in case of multiple definitions).
+    Namespace *classDef;
 
     bool hasTrFunctions;
     bool complained; // ... that tr functions are missing.
 };
 
-typedef QList<Namespace *> NamespaceList;
+static int nextFileId;
+
+class VisitRecorder {
+public:
+    VisitRecorder()
+    {
+        m_ba.resize(nextFileId);
+    }
+    bool tryVisit(int fileId)
+    {
+        if (m_ba.at(fileId))
+            return false;
+        m_ba[fileId] = true;
+        return true;
+    }
+private:
+    QBitArray m_ba;
+};
 
 struct ParseResults {
 
     ParseResults()
     {
-        static int nextFileId;
-        rootNamespace.fileId = nextFileId++;
         tor = 0;
     }
-    bool detachNamespace(Namespace **that);
-    Namespace *include(Namespace *that, const Namespace *other);
-    void unite(const ParseResults *other);
 
+    int fileId;
     Namespace rootNamespace;
     Translator *tor;
-    QSet<QString> allIncludes;
+    QSet<const ParseResults *> includes;
 };
 
 typedef QHash<QString, const ParseResults *> ParseResultHash;
@@ -117,7 +175,7 @@ class CppFiles {
 
 public:
     static const ParseResults *getResults(const QString &cleanFile);
-    static void setResults(const QString &cleanFile, const ParseResults *results);
+    static void setResults(const QString &cleanFile, ParseResults *results);
     static bool isBlacklisted(const QString &cleanFile);
     static void setBlacklisted(const QString &cleanFile);
 
@@ -135,13 +193,13 @@ public:
     void setTranslator(Translator *tor) { results->tor = tor; }
     void parse(const QString &initialContext, ConversionData &cd, QSet<QString> &inclusions);
     void parseInternal(ConversionData &cd, QSet<QString> &inclusions);
-    const ParseResults *getResults() const { return results; }
+    ParseResults *getResults() const { return results; }
     void deleteResults() { delete results; }
 
     struct SavedState {
-        QStringList namespaces;
+        NamespaceList namespaces;
         QStack<int> namespaceDepths;
-        QStringList functionContext;
+        NamespaceList functionContext;
         QString functionContextUnresolved;
         QString pendingContext;
     };
@@ -183,15 +241,28 @@ private:
 
     static QString stringifyNamespace(const NamespaceList &namespaces);
     static QStringList stringListifyNamespace(const NamespaceList &namespaces);
-    void modifyNamespace(NamespaceList *namespaces);
-    NamespaceList resolveNamespaces(const QStringList &segments);
-    bool qualifyOne(const NamespaceList &namespaces, int nsIdx, const QString &segment,
-                    NamespaceList *resolved);
-    bool fullyQualify(const NamespaceList &namespaces, const QStringList &segments,
+    typedef bool (CppParser::*VisitNamespaceCallback)(const Namespace *ns, void *context) const;
+    bool visitNamespace(const NamespaceList &namespaces, int nsCount,
+                        VisitNamespaceCallback callback, void *context,
+                        VisitRecorder &vr, const ParseResults *rslt) const;
+    bool visitNamespace(const NamespaceList &namespaces, int nsCount,
+                        VisitNamespaceCallback callback, void *context) const;
+    static QStringList stringListifySegments(const QList<HashString> &namespaces);
+    bool qualifyOneCallbackOwn(const Namespace *ns, void *context) const;
+    bool qualifyOneCallbackUsing(const Namespace *ns, void *context) const;
+    bool qualifyOne(const NamespaceList &namespaces, int nsCnt, const HashString &segment,
+                    NamespaceList *resolved) const;
+    bool fullyQualify(const NamespaceList &namespaces, const QList<HashString> &segments,
                       bool isDeclaration,
-                      NamespaceList *resolved, QStringList *unresolved);
-    void enterNamespace(NamespaceList *namespaces, const QString &name);
+                      NamespaceList *resolved, QStringList *unresolved) const;
+    bool fullyQualify(const NamespaceList &namespaces, const QString &segments,
+                      bool isDeclaration,
+                      NamespaceList *resolved, QStringList *unresolved) const;
+    bool findNamespaceCallback(const Namespace *ns, void *context) const;
+    const Namespace *findNamespace(const NamespaceList &namespaces, int nsCount = -1) const;
+    void enterNamespace(NamespaceList *namespaces, const HashString &name, bool isClass);
     void truncateNamespaces(NamespaceList *namespaces, int lenght);
+    Namespace *modifyNamespace(NamespaceList *namespaces, bool tryOrigin = true);
 
     enum {
         Tok_Eof, Tok_class, Tok_friend, Tok_namespace, Tok_using, Tok_return,
@@ -837,85 +908,40 @@ uint CppParser::getToken()
 
 void CppParser::saveState(SavedState *state)
 {
-    state->namespaces = stringListifyNamespace(namespaces);
+    state->namespaces = namespaces;
     state->namespaceDepths = namespaceDepths;
-    state->functionContext = stringListifyNamespace(functionContext);
+    state->functionContext = functionContext;
     state->functionContextUnresolved = functionContextUnresolved;
     state->pendingContext = pendingContext;
 }
 
 void CppParser::loadState(const SavedState *state)
 {
-    namespaces = resolveNamespaces(state->namespaces);
+    namespaces = state->namespaces;
     namespaceDepths = state->namespaceDepths;
-    functionContext = resolveNamespaces(state->functionContext);
+    functionContext = state->functionContext;
     functionContextUnresolved = state->functionContextUnresolved;
     pendingContext = state->pendingContext;
 }
 
-bool ParseResults::detachNamespace(Namespace **that)
-{
-    if ((*that)->fileId != rootNamespace.fileId) {
-        Namespace *newThat = new Namespace;
-        *newThat = **that;
-        newThat->fileId = rootNamespace.fileId;
-        *that = newThat;
-        return true;
-    }
-    return false;
-}
-
-Namespace *ParseResults::include(Namespace *that, const Namespace *other)
+Namespace *CppParser::modifyNamespace(NamespaceList *namespaces, bool tryOrigin)
 {
-    Namespace *origThat = that;
-    foreach (Namespace *otherSub, other->children) {
-        if (Namespace *thisSub = that->children.value(otherSub->name)) {
-            // Don't make these cause a detach - it's best
-            // (though not necessary) if they are shared
-            thisSub->isClass |= otherSub->isClass;
-            thisSub->hasTrFunctions |= otherSub->hasTrFunctions;
-            thisSub->complained |= otherSub->complained;
-
-            if (Namespace *newSub = include(thisSub, otherSub)) {
-                thisSub = newSub;
-                detachNamespace(&that);
-                that->children[thisSub->name] = thisSub;
-            }
-        } else {
-            detachNamespace(&that);
-            that->children[otherSub->name] = otherSub;
-        }
-    }
-    if ((that->aliases != other->aliases && !other->aliases.isEmpty())
-        || (that->usings != other->usings && !other->usings.isEmpty())) {
-        detachNamespace(&that);
-        that->aliases.unite(other->aliases);
-        that->usings.unite(other->usings);
-    }
-    return (that != origThat) ? that : 0;
-}
-
-void ParseResults::unite(const ParseResults *other)
-{
-    allIncludes.unite(other->allIncludes);
-    include(&rootNamespace, &other->rootNamespace);
-}
-
-void CppParser::modifyNamespace(NamespaceList *namespaces)
-{
-    Namespace *pns = 0;
-    int i = namespaces->count();
-    forever {
-        --i;
-        Namespace *ns = namespaces->at(i);
-        bool detached = results->detachNamespace(&ns);
-        if (pns)
-            ns->children[pns->name] = pns;
-        if (!detached) // Known to be true for root namespace
-            return;
+    Namespace *pns, *ns = &results->rootNamespace;
+    for (int i = 1; i < namespaces->count(); ++i) {
         pns = ns;
-        namespaces->replace(i, ns);
+        if (!(ns = pns->children.value(namespaces->at(i)))) {
+            do {
+                ns = new Namespace;
+                if (tryOrigin)
+                    if (const Namespace *ons = findNamespace(*namespaces, i + 1))
+                        ns->classDef = ons->classDef;
+                pns->children.insert(namespaces->at(i), ns);
+                pns = ns;
+            } while (++i < namespaces->count());
+            break;
+        }
     }
+    return ns;
 }
 
 QString CppParser::stringifyNamespace(const NamespaceList &namespaces)
@@ -924,7 +950,7 @@ QString CppParser::stringifyNamespace(const NamespaceList &namespaces)
     for (int i = 1; i < namespaces.count(); ++i) {
         if (i > 1)
             ret += QLatin1String("::");
-        ret += namespaces.at(i)->name;
+        ret += namespaces.at(i).value();
     }
     return ret;
 }
@@ -933,58 +959,102 @@ QStringList CppParser::stringListifyNamespace(const NamespaceList &namespaces)
 {
     QStringList ret;
     for (int i = 1; i < namespaces.count(); ++i)
-        ret << namespaces.at(i)->name;
+        ret << namespaces.at(i).value();
     return ret;
 }
 
-// This function is called only with known-existing namespaces
-NamespaceList CppParser::resolveNamespaces(const QStringList &segments)
+bool CppParser::visitNamespace(const NamespaceList &namespaces, int nsCount,
+                               VisitNamespaceCallback callback, void *context,
+                               VisitRecorder &vr, const ParseResults *rslt) const
 {
-    NamespaceList ret;
-    Namespace *ns = &results->rootNamespace;
-    ret << ns;
-    foreach (const QString &seg, segments) {
-        ns = ns->children.value(seg);
-        ret << ns;
-    }
+    const Namespace *ns = &rslt->rootNamespace;
+    for (int i = 1; i < nsCount; ++i)
+        if (!(ns = ns->children.value(namespaces.at(i))))
+            goto supers;
+    if ((this->*callback)(ns, context))
+        return true;
+supers:
+    foreach (const ParseResults *sup, rslt->includes)
+        if (vr.tryVisit(sup->fileId)
+            && visitNamespace(namespaces, nsCount, callback, context, vr, sup))
+            return true;
+    return false;
+}
+
+bool CppParser::visitNamespace(const NamespaceList &namespaces, int nsCount,
+                               VisitNamespaceCallback callback, void *context) const
+{
+    VisitRecorder vr;
+    return visitNamespace(namespaces, nsCount, callback, context, vr, results);
+}
+
+QStringList CppParser::stringListifySegments(const QList<HashString> &segments)
+{
+    QStringList ret;
+    for (int i = 0; i < segments.count(); ++i)
+        ret << segments.at(i).value();
     return ret;
 }
 
-bool CppParser::qualifyOne(const NamespaceList &namespaces, int nsIdx, const QString &segment,
-                           NamespaceList *resolved)
+struct QualifyOneData {
+    const NamespaceList &namespaces;
+    int nsCount;
+    const HashString &segment;
+    NamespaceList *resolved;
+    QSet<HashStringList> visitedUsings;
+};
+
+bool CppParser::qualifyOneCallbackOwn(const Namespace *ns, void *context) const
 {
-    const Namespace *ns = namespaces.at(nsIdx);
-    QMap<QString, Namespace *>::ConstIterator cnsi = ns->children.constFind(segment);
-    if (cnsi != ns->children.constEnd()) {
-        *resolved = namespaces.mid(0, nsIdx + 1);
-        *resolved << *cnsi;
+    QualifyOneData *data = (QualifyOneData *)context;
+    if (ns->children.contains(data->segment)) {
+        *data->resolved = data->namespaces.mid(0, data->nsCount);
+        *data->resolved << data->segment;
         return true;
     }
-    QMap<QString, QStringList>::ConstIterator nsai = ns->aliases.constFind(segment);
+    QHash<HashString, NamespaceList>::ConstIterator nsai = ns->aliases.constFind(data->segment);
     if (nsai != ns->aliases.constEnd()) {
-        *resolved = resolveNamespaces(*nsai);
+        *data->resolved = *nsai;
         return true;
     }
-    foreach (const QStringList &use, ns->usings) {
-        NamespaceList usedNs = resolveNamespaces(use);
-        if (qualifyOne(usedNs, usedNs.count() - 1, segment, resolved))
-            return true;
-    }
     return false;
 }
 
-bool CppParser::fullyQualify(const NamespaceList &namespaces, const QStringList &segments,
+bool CppParser::qualifyOneCallbackUsing(const Namespace *ns, void *context) const
+{
+    QualifyOneData *data = (QualifyOneData *)context;
+    foreach (const HashStringList &use, ns->usings)
+        if (!data->visitedUsings.contains(use)) {
+            data->visitedUsings.insert(use);
+            if (qualifyOne(use.value(), use.value().count(), data->segment, data->resolved))
+                return true;
+        }
+    return false;
+}
+
+bool CppParser::qualifyOne(const NamespaceList &namespaces, int nsCnt, const HashString &segment,
+                           NamespaceList *resolved) const
+{
+    QualifyOneData data = { namespaces, nsCnt, segment, resolved, QSet<HashStringList>() };
+
+    if (visitNamespace(namespaces, nsCnt, &CppParser::qualifyOneCallbackOwn, &data))
+        return true;
+
+    return visitNamespace(namespaces, nsCnt, &CppParser::qualifyOneCallbackUsing, &data);
+}
+
+bool CppParser::fullyQualify(const NamespaceList &namespaces, const QList<HashString> &segments,
                              bool isDeclaration,
-                             NamespaceList *resolved, QStringList *unresolved)
+                             NamespaceList *resolved, QStringList *unresolved) const
 {
     int nsIdx;
     int initSegIdx;
 
-    if (segments.first().isEmpty()) {
+    if (segments.first().value().isEmpty()) {
         // fully qualified
         if (segments.count() == 1) {
             resolved->clear();
-            *resolved << &results->rootNamespace;
+            *resolved << HashString(QString());
             return true;
         }
         initSegIdx = 1;
@@ -995,12 +1065,12 @@ bool CppParser::fullyQualify(const NamespaceList &namespaces, const QStringList
     }
 
     do {
-        if (qualifyOne(namespaces, nsIdx, segments[initSegIdx], resolved)) {
+        if (qualifyOne(namespaces, nsIdx + 1, segments[initSegIdx], resolved)) {
             int segIdx = initSegIdx;
             while (++segIdx < segments.count()) {
-                if (!qualifyOne(*resolved, resolved->count() - 1, segments[segIdx], resolved)) {
+                if (!qualifyOne(*resolved, resolved->count(), segments[segIdx], resolved)) {
                     if (unresolved)
-                        *unresolved = segments.mid(segIdx);
+                        *unresolved = stringListifySegments(segments.mid(segIdx));
                     return false;
                 }
             }
@@ -1008,23 +1078,47 @@ bool CppParser::fullyQualify(const NamespaceList &namespaces, const QStringList
         }
     } while (!isDeclaration && --nsIdx >= 0);
     resolved->clear();
-    *resolved << &results->rootNamespace;
+    *resolved << HashString(QString());
     if (unresolved)
-        *unresolved = segments.mid(initSegIdx);
+        *unresolved = stringListifySegments(segments.mid(initSegIdx));
     return false;
 }
 
-void CppParser::enterNamespace(NamespaceList *namespaces, const QString &name)
+bool CppParser::fullyQualify(const NamespaceList &namespaces, const QString &quali,
+                             bool isDeclaration,
+                             NamespaceList *resolved, QStringList *unresolved) const
+{
+    static QString strColons(QLatin1String("::"));
+
+    QList<HashString> segments;
+    foreach (const QString &str, quali.split(strColons)) // XXX slow, but needs to be fast(?)
+        segments << HashString(str);
+    return fullyQualify(namespaces, segments, isDeclaration, resolved, unresolved);
+}
+
+bool CppParser::findNamespaceCallback(const Namespace *ns, void *context) const
 {
-    Namespace *ns = namespaces->last()->children.value(name);
-    if (!ns) {
-        ns = new Namespace;
-        ns->fileId = results->rootNamespace.fileId;
-        ns->name = name;
-        modifyNamespace(namespaces);
-        namespaces->last()->children[name] = ns;
+    *((const Namespace **)context) = ns;
+    return true;
+}
+
+const Namespace *CppParser::findNamespace(const NamespaceList &namespaces, int nsCount) const
+{
+    const Namespace *ns = 0;
+    if (nsCount == -1)
+        nsCount = namespaces.count();
+    visitNamespace(namespaces, nsCount, &CppParser::findNamespaceCallback, &ns);
+    return ns;
+}
+
+void CppParser::enterNamespace(NamespaceList *namespaces, const HashString &name, bool isClass)
+{
+    *namespaces << name;
+    if (!findNamespace(*namespaces)) {
+        Namespace *ns = modifyNamespace(namespaces, false);
+        if (isClass)
+            ns->classDef = ns;
     }
-    *namespaces << ns;
 }
 
 void CppParser::truncateNamespaces(NamespaceList *namespaces, int length)
@@ -1056,8 +1150,9 @@ const ParseResults *CppFiles::getResults(const QString &cleanFile)
     return parsedFiles().value(cleanFile);
 }
 
-void CppFiles::setResults(const QString &cleanFile, const ParseResults *results)
+void CppFiles::setResults(const QString &cleanFile, ParseResults *results)
 {
+    results->fileId = nextFileId++;
     parsedFiles().insert(cleanFile, results);
 }
 
@@ -1093,12 +1188,8 @@ void CppParser::processInclude(const QString &file, ConversionData &cd,
         QString fileExt = QFileInfo(cleanFile).suffix();
         if (fileExt.isEmpty() || fileExt.startsWith(QLatin1Char('h'), Qt::CaseInsensitive)) {
 
-            if (results->allIncludes.contains(cleanFile))
-                return;
-            results->allIncludes.insert(cleanFile);
-
             if (const ParseResults *res = CppFiles::getResults(cleanFile)) {
-                results->unite(res);
+                results->includes.insert(res);
                 return;
             }
 
@@ -1128,8 +1219,8 @@ void CppParser::processInclude(const QString &file, ConversionData &cd,
             }
         parser.setInput(ts, cleanFile);
         parser.parse(cd.m_defaultContext, cd, inclusions);
-        CppFiles::setResults(cleanFile, parser.getResults());
-        results->unite(parser.results);
+        CppFiles::setResults(cleanFile, parser.results);
+        results->includes.insert(parser.results);
     } else {
         CppParser parser(results);
         parser.namespaces = namespaces;
@@ -1138,12 +1229,6 @@ void CppParser::processInclude(const QString &file, ConversionData &cd,
         parser.pendingContext = pendingContext;
         parser.setInput(ts, cleanFile);
         parser.parseInternal(cd, inclusions);
-        // Don't wreak havoc if not enough braces were found.
-        truncateNamespaces(&parser.namespaces, namespaces.count());
-        truncateNamespaces(&parser.functionContext, functionContext.count());
-        // Copy them back - the pointers might have changed.
-        namespaces = parser.namespaces;
-        functionContext = parser.functionContext;
         // Avoid that messages obtained by direct scanning are used
         CppFiles::setBlacklisted(cleanFile);
     }
@@ -1330,7 +1415,7 @@ void CppParser::parse(const QString &initialContext, ConversionData &cd,
     if (results->tor)
         yyCodecIsUtf8 = (results->tor->codecName() == "UTF-8");
 
-    namespaces << &results->rootNamespace;
+    namespaces << HashString();
     functionContext = namespaces;
     functionContextUnresolved = initialContext;
 
@@ -1405,8 +1490,8 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
             */
             yyTok = getToken();
             if (yyBraceDepth == namespaceDepths.count() && yyParenDepth == 0) {
-                QStringList quali;
-                QString fct;
+                QList<HashString> quali;
+                HashString fct;
                 do {
                     /*
                       This code should execute only once, but we play
@@ -1414,8 +1499,9 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                       'class Q_EXPORT QMessageBox', in which case
                       'QMessageBox' is the class name, not 'Q_EXPORT'.
                     */
-                    fct = yyWord;
-                    fct.detach();
+                    text = yyWord;
+                    text.detach();
+                    fct.setValue(text);
                     yyTok = getToken();
                 } while (yyTok == Tok_Ident);
                 while (yyTok == Tok_ColonColon) {
@@ -1423,8 +1509,9 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                     if (yyTok != Tok_Ident)
                         break; // Oops ...
                     quali << fct;
-                    fct = yyWord;
-                    fct.detach();
+                    text = yyWord;
+                    text.detach();
+                    fct.setValue(text);
                     yyTok = getToken();
                 }
                 while (yyTok == Tok_Comment)
@@ -1456,8 +1543,7 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                 } else {
                     namespaceDepths.push(namespaces.count());
                 }
-                enterNamespace(&namespaces, fct);
-                namespaces.last()->isClass = true;
+                enterNamespace(&namespaces, fct, true);
 
                 functionContext = namespaces;
                 functionContextUnresolved.clear(); // Pointless
@@ -1469,34 +1555,33 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
             yyTokColonSeen = false;
             yyTok = getToken();
             if (yyTok == Tok_Ident) {
-                QString ns = yyWord;
-                ns.detach();
+                text = yyWord;
+                text.detach();
+                HashString ns = HashString(text);
                 yyTok = getToken();
                 if (yyTok == Tok_LeftBrace) {
                     namespaceDepths.push(namespaces.count());
-                    enterNamespace(&namespaces, ns);
+                    enterNamespace(&namespaces, ns, false);
                     yyTok = getToken();
                 } else if (yyTok == Tok_Equals) {
                     // e.g. namespace Is = OuterSpace::InnerSpace;
-                    QStringList fullName;
+                    QList<HashString> fullName;
                     yyTok = getToken();
                     if (yyTok == Tok_ColonColon)
-                        fullName.append(QString());
+                        fullName.append(HashString(QString()));
                     while (yyTok == Tok_ColonColon || yyTok == Tok_Ident) {
                         if (yyTok == Tok_Ident) {
                             text = yyWord;
                             text.detach();
-                            fullName.append(text);
+                            fullName.append(HashString(text));
                         }
                         yyTok = getToken();
                     }
                     if (fullName.isEmpty())
                         break;
                     NamespaceList nsl;
-                    if (fullyQualify(namespaces, fullName, false, &nsl, 0)) {
-                        modifyNamespace(&namespaces);
-                        namespaces.last()->aliases.insert(ns, stringListifyNamespace(nsl));
-                    }
+                    if (fullyQualify(namespaces, fullName, false, &nsl, 0))
+                        modifyNamespace(&namespaces, false)->aliases[ns] = nsl;
                 }
             } else if (yyTok == Tok_LeftBrace) {
                 // Anonymous namespace
@@ -1506,43 +1591,40 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
             break;
         case Tok_using:
             yyTok = getToken();
+            // XXX this should affect only the current scope, not the entire current namespace
             if (yyTok == Tok_namespace) {
-                QStringList fullName;
+                QList<HashString> fullName;
                 yyTok = getToken();
                 if (yyTok == Tok_ColonColon)
-                    fullName.append(QString());
+                    fullName.append(HashString(QString()));
                 while (yyTok == Tok_ColonColon || yyTok == Tok_Ident) {
                     if (yyTok == Tok_Ident) {
                         text = yyWord;
                         text.detach();
-                        fullName.append(text);
+                        fullName.append(HashString(text));
                     }
                     yyTok = getToken();
                 }
                 NamespaceList nsl;
-                if (fullyQualify(namespaces, fullName, false, &nsl, 0)) {
-                    modifyNamespace(&namespaces);
-                    namespaces.last()->usings.insert(stringListifyNamespace(nsl));
-                }
+                if (fullyQualify(namespaces, fullName, false, &nsl, 0))
+                    modifyNamespace(&namespaces, false)->usings << HashStringList(nsl);
             } else {
-                QStringList fullName;
+                QList<HashString> fullName;
                 if (yyTok == Tok_ColonColon)
-                    fullName.append(QString());
+                    fullName.append(HashString(QString()));
                 while (yyTok == Tok_ColonColon || yyTok == Tok_Ident) {
                     if (yyTok == Tok_Ident) {
                         text = yyWord;
                         text.detach();
-                        fullName.append(text);
+                        fullName.append(HashString(text));
                     }
                     yyTok = getToken();
                 }
                 if (fullName.isEmpty())
                     break;
                 NamespaceList nsl;
-                if (fullyQualify(namespaces, fullName, false, &nsl, 0)) {
-                    modifyNamespace(&namespaces);
-                    namespaces.last()->aliases.insert(nsl.last()->name, stringListifyNamespace(nsl));
-                }
+                if (fullyQualify(namespaces, fullName, false, &nsl, 0))
+                    modifyNamespace(&namespaces, true)->aliases[nsl.last()] = nsl;
             }
             break;
         case Tok_tr:
@@ -1570,8 +1652,7 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                 }
                 if (!pendingContext.isEmpty()) {
                     QStringList unresolved;
-                    if (!fullyQualify(namespaces, pendingContext.split(strColons), true,
-                                      &functionContext, &unresolved)) {
+                    if (!fullyQualify(namespaces, pendingContext, true, &functionContext, &unresolved)) {
                         functionContextUnresolved = unresolved.join(strColons);
                         qWarning("%s:%d: Qualifying with unknown namespace/class %s::%s\n",
                                  qPrintable(yyFileName), yyLineNo,
@@ -1588,14 +1669,15 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                                      qPrintable(yyFileName), yyLineNo);
                             break;
                         }
-                        while (!functionContext.at(idx - 1)->hasTrFunctions) {
-                            if (idx == 1 || !functionContext.at(idx - 2)->isClass) {
+                        while (!findNamespace(functionContext, idx)->classDef->hasTrFunctions) {
+                            if (idx == 1 || !findNamespace(functionContext, idx - 1)->classDef) {
                                 context = stringifyNamespace(functionContext);
-                                if (!functionContext.last()->complained) {
+                                Namespace *fctx = findNamespace(functionContext)->classDef;
+                                if (!fctx->complained) {
                                     qWarning("%s:%d: Class '%s' lacks Q_OBJECT macro\n",
                                              qPrintable(yyFileName), yyLineNo,
                                              qPrintable(context));
-                                    functionContext.last()->complained = true;
+                                    fctx->complained = true;
                                 }
                                 goto gotctx;
                             }
@@ -1603,7 +1685,7 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                         }
                         context.clear();
                         for (int i = 1;;) {
-                            context += functionContext.at(i)->name;
+                            context += functionContext.at(i).value();
                             if (++i == idx)
                                 break;
                             context += strColons;
@@ -1625,13 +1707,14 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
                     prefix.chop(2);
                     NamespaceList nsl;
                     QStringList unresolved;
-                    if (fullyQualify(functionContext, prefix.split(strColons), false, &nsl, &unresolved)) {
+                    if (fullyQualify(functionContext, prefix, false, &nsl, &unresolved)) {
                         context = stringifyNamespace(nsl);
-                        if (!nsl.last()->hasTrFunctions && !nsl.last()->complained) {
+                        Namespace *fctx = findNamespace(nsl)->classDef;
+                        if (!fctx->hasTrFunctions && !fctx->complained) {
                             qWarning("%s:%d: Class '%s' lacks Q_OBJECT macro\n",
                                      qPrintable(yyFileName), yyLineNo,
                                      qPrintable(context));
-                            nsl.last()->complained = true;
+                            fctx->complained = true;
                         }
                     } else {
                         context = (stringListifyNamespace(nsl) + unresolved).join(strColons);
@@ -1727,7 +1810,7 @@ void CppParser::parseInternal(ConversionData &cd, QSet<QString> &inclusions)
             break;
         case Tok_Q_DECLARE_TR_FUNCTIONS:
         case Tok_Q_OBJECT:
-            namespaces.last()->hasTrFunctions = true;
+            modifyNamespace(&namespaces, true)->hasTrFunctions = true;
             yyTok = getToken();
             break;
         case Tok_Ident: