Build qmake with QT_USE_STRINGBUILDER

Should improve performance and is going to be required in
the future anyway.

Change-Id: I89d7c50441d2491da1ab0a4d564dcc91f52ade85
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

14 files changed, 80 insertions, 36 deletions

diff --git a/qmake/CMakeLists.txt b/qmake/CMakeLists.txt
index 3bfd27f293..7017812aca 100644
--- a/qmake/CMakeLists.txt
+++ b/qmake/CMakeLists.txt
@@ -72,6 +72,7 @@ qt_add_tool(qmake # special case
         ../src/corelib/text/qregexp.cpp ../src/corelib/text/qregexp.h
         ../src/corelib/tools/qringbuffer.cpp # special case
         ../src/corelib/text/qstring.cpp ../src/corelib/text/qstring.h
+        ../src/corelib/text/qstringbuilder.cpp ../src/corelib/text/qstringbuilder.h
         ../src/corelib/text/qstringlist.cpp ../src/corelib/text/qstringlist.h
         ../src/corelib/text/qstringmatcher.h
         ../src/corelib/tools/qvector.h
@@ -110,6 +111,7 @@ qt_add_tool(qmake # special case
         PROEVALUATOR_FULL
         QT_BOOTSTRAPPED
         QT_BUILD_QMAKE
+        QT_USE_QSTRINGBUILDER
         QT_NO_FOREACH
         QT_VERSION_STR="${PROJECT_VERSION}" # special case
         QT_VERSION_MAJOR=${PROJECT_VERSION_MAJOR} # special case
diff --git a/qmake/Makefile.unix b/qmake/Makefile.unix
index 32c6d1dae6..d113b456d4 100644
--- a/qmake/Makefile.unix
+++ b/qmake/Makefile.unix
@@ -143,7 +143,7 @@ CPPFLAGS = -g $(EXTRA_CPPFLAGS) \
 	   -I$(QMAKESPEC) \
 	   -DQT_VERSION_STR=\"$(QT_VERSION)\" -DQT_VERSION_MAJOR=$(QT_MAJOR_VERSION) -DQT_VERSION_MINOR=$(QT_MINOR_VERSION) -DQT_VERSION_PATCH=$(QT_PATCH_VERSION) \
 	   -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL \
-	   -DQT_NO_FOREACH
+	   -DQT_NO_FOREACH -DQT_USE_QSTRINGBUILDER
 
 CXXFLAGS = $(EXTRA_CXXFLAGS) $(CONFIG_CXXFLAGS) $(CPPFLAGS)
 LFLAGS = $(EXTRA_LFLAGS) $(CONFIG_LFLAGS)
diff --git a/qmake/Makefile.win32 b/qmake/Makefile.win32
index 20644595d2..3430cf8c7f 100644
--- a/qmake/Makefile.win32
+++ b/qmake/Makefile.win32
@@ -38,7 +38,7 @@ CFLAGS_BARE = -c -Fo./ -Fdqmake.pdb \
               -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS \
               -DQT_VERSION_STR=\"$(QT_VERSION)\" -DQT_VERSION_MAJOR=$(QT_MAJOR_VERSION) -DQT_VERSION_MINOR=$(QT_MINOR_VERSION) -DQT_VERSION_PATCH=$(QT_PATCH_VERSION) \
               -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL \
-              -DQT_NO_FOREACH -DUNICODE -D_ENABLE_EXTENDED_ALIGNED_STORAGE
+              -DQT_NO_FOREACH -DQT_USE_QSTRINGBUILDER -DUNICODE -D_ENABLE_EXTENDED_ALIGNED_STORAGE
 CFLAGS   = $(CFLAGS_PCH) $(CFLAGS_BARE) $(CFLAGS)
 
 CXXFLAGS_BARE = $(CFLAGS_BARE)
diff --git a/qmake/generators/mac/pbuilder_pbx.cpp b/qmake/generators/mac/pbuilder_pbx.cpp
index c2f6df7787..ec0a044361 100644
--- a/qmake/generators/mac/pbuilder_pbx.cpp
+++ b/qmake/generators/mac/pbuilder_pbx.cpp
@@ -644,7 +644,7 @@ ProjectBuilderMakefileGenerator::writeMakeParts(QTextStream &t)
                 bool isObj = project->values(ProKey(*it + ".CONFIG")).indexOf("no_link") == -1;
                 if (!isObj) {
                     for (int i = 0; i < sources.size(); ++i) {
-                        if (sources.at(i).keyName() == inputs.at(input)) {
+                        if (sources.at(i).keyName() == inputs.at(input).toQStringView()) {
                             duplicate = true;
                             break;
                         }
diff --git a/qmake/generators/mac/pbuilder_pbx.h b/qmake/generators/mac/pbuilder_pbx.h
index 1b90a3bbeb..9b85764caa 100644
--- a/qmake/generators/mac/pbuilder_pbx.h
+++ b/qmake/generators/mac/pbuilder_pbx.h
@@ -56,8 +56,6 @@ class ProjectBuilderMakefileGenerator : public UnixMakefileGenerator
     enum { SettingsAsList=0x01, SettingsNoQuote=0x02 };
     inline QString writeSettings(const QString &var, const char *val, int flags=0, int indent_level=0)
         { return writeSettings(var, ProString(val), flags, indent_level); }
-    inline QString writeSettings(const QString &var, const QString &val, int flags=0, int indent_level=0)
-        { return writeSettings(var, ProString(val), flags, indent_level); }
     inline QString writeSettings(const QString &var, const ProString &val, int flags=0, int indent_level=0)
         { return writeSettings(var, ProStringList(val), flags, indent_level); }
     QString writeSettings(const QString &var, const ProStringList &vals, int flags=0, int indent_level=0);
diff --git a/qmake/generators/makefile.cpp b/qmake/generators/makefile.cpp
index 5c61a3c65c..9d2d240bc2 100644
--- a/qmake/generators/makefile.cpp
+++ b/qmake/generators/makefile.cpp
@@ -2273,7 +2273,7 @@ QString MakefileGenerator::fullBuildArgs()
 
     //output
     QString ofile = fileFixify(Option::output.fileName());
-    if(!ofile.isEmpty() && ofile != project->first("QMAKE_MAKEFILE"))
+    if (!ofile.isEmpty() && ofile != project->first("QMAKE_MAKEFILE").toQStringView())
         ret += " -o " + escapeFilePath(ofile);
 
     //inputs
@@ -2515,7 +2515,7 @@ MakefileGenerator::writeSubTargets(QTextStream &t, QList<MakefileGenerator::SubT
         if(!abs_source_path.isEmpty() && out_directory.startsWith(abs_source_path))
             out_directory = Option::output_dir + out_directory.mid(abs_source_path.length());
 
-        QString out_directory_cdin = out_directory.isEmpty() ? "\n\t"
+        QString out_directory_cdin = out_directory.isEmpty() ? QString("\n\t")
                                                              : "\n\tcd " + escapeFilePath(out_directory) + " && ";
         QString makefilein = " -f " + escapeFilePath(subtarget->makefile);
 
@@ -2696,7 +2696,7 @@ MakefileGenerator::writeSubTargets(QTextStream &t, QList<MakefileGenerator::SubT
                 if(!recurse.contains(subtarget->name))
                     continue;
 
-                QString out_directory_cdin = out_directory.isEmpty() ? "\n\t"
+                QString out_directory_cdin = out_directory.isEmpty() ? QString("\n\t")
                                                                      : "\n\tcd " + escapeFilePath(out_directory) + " && ";
                 QString makefilein = " -f " + escapeFilePath(subtarget->makefile);
 
diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
index bae32883b4..b80b6e3e08 100644
--- a/qmake/generators/makefile.h
+++ b/qmake/generators/makefile.h
@@ -140,10 +140,16 @@ protected:
     //escape
     virtual QString escapeFilePath(const QString &path) const = 0;
     ProString escapeFilePath(const ProString &path) const;
+    template<typename A, typename B>
+    QString escapeFilePath(const QStringBuilder<A, B> &path) const
+    { return escapeFilePath(QString(path)); }
     QStringList escapeFilePaths(const QStringList &paths) const;
     ProStringList escapeFilePaths(const ProStringList &paths) const;
     virtual QString escapeDependencyPath(const QString &path) const;
     ProString escapeDependencyPath(const ProString &path) const;
+    template<typename A, typename B>
+    QString escapeDependencyPath(const QStringBuilder<A, B> &path) const
+    { return escapeDependencyPath(QString(path)); }
     QStringList escapeDependencyPaths(const QStringList &paths) const;
     ProStringList escapeDependencyPaths(const ProStringList &paths) const;
 
diff --git a/qmake/generators/unix/unixmake.h b/qmake/generators/unix/unixmake.h
index 28302b4f15..1f32e4341f 100644
--- a/qmake/generators/unix/unixmake.h
+++ b/qmake/generators/unix/unixmake.h
@@ -50,7 +50,7 @@ protected:
 
     bool findLibraries(bool linkPrl, bool mergeLflags) override;
     QString escapeFilePath(const QString &path) const override;
-    ProString escapeFilePath(const ProString &path) const { return MakefileGenerator::escapeFilePath(path); }
+    using MakefileGenerator::escapeFilePath;
     QStringList &findDependencies(const QString &) override;
     void init() override;
 
diff --git a/qmake/generators/unix/unixmake2.cpp b/qmake/generators/unix/unixmake2.cpp
index 0412b52813..19975bc8bb 100644
--- a/qmake/generators/unix/unixmake2.cpp
+++ b/qmake/generators/unix/unixmake2.cpp
@@ -134,7 +134,7 @@ UnixMakefileGenerator::writeSubTargets(QTextStream &t, QList<MakefileGenerator::
         if (!dist_directory.startsWith(Option::dir_sep))
             dist_directory.prepend(Option::dir_sep);
 
-        QString out_directory_cdin = out_directory.isEmpty() ? "\n\t"
+        QString out_directory_cdin = out_directory.isEmpty() ? QString("\n\t")
                                                              : "\n\tcd " + escapeFilePath(out_directory) + " && ";
         QString makefilein = " -e -f " + escapeFilePath(subtarget->makefile)
                 + " distdir DISTDIR=$(DISTDIR)" + escapeFilePath(dist_directory);
@@ -749,7 +749,7 @@ UnixMakefileGenerator::writeMakeParts(QTextStream &t)
                 (!isShallowBundle
                     ? (isFramework
                         ? ("Versions/" + project->first("QMAKE_FRAMEWORK_VERSION") + "/Resources/")
-                        : "Contents/")
+                        : QString("Contents/"))
                     : QString())
                 + "Info.plist";
             bundledFiles << info_plist_out;
diff --git a/qmake/generators/win32/msvc_nmake.cpp b/qmake/generators/win32/msvc_nmake.cpp
index 2fb24201bd..73e84a3269 100644
--- a/qmake/generators/win32/msvc_nmake.cpp
+++ b/qmake/generators/win32/msvc_nmake.cpp
@@ -86,8 +86,8 @@ QString NmakeMakefileGenerator::defaultInstall(const QString &t)
 
     if (project->isActiveConfig("debug_info")) {
         if (t == "dlltarget" || project->values(ProKey(t + ".CONFIG")).indexOf("no_dll") == -1) {
-            const QFileInfo targetFileInfo = project->first("DESTDIR") + project->first("TARGET")
-                    + project->first("TARGET_EXT");
+            const QFileInfo targetFileInfo(project->first("DESTDIR") + project->first("TARGET")
+                    + project->first("TARGET_EXT"));
             const QString pdb_target = targetFileInfo.completeBaseName() + ".pdb";
             QString src_targ = (project->isEmpty("DESTDIR") ? QString("$(DESTDIR)") : project->first("DESTDIR")) + pdb_target;
             QString dst_targ = filePrefixRoot(root, fileFixify(targetdir + pdb_target, FileFixifyAbsolute));
@@ -245,8 +245,8 @@ void NmakeMakefileGenerator::init()
         project->values("PRECOMPILED_PCH_C")    = ProStringList(precompPchC);
     }
 
-    const QFileInfo targetFileInfo = project->first("DESTDIR") + project->first("TARGET")
-            + project->first("TARGET_EXT");
+    const QFileInfo targetFileInfo(project->first("DESTDIR") + project->first("TARGET")
+            + project->first("TARGET_EXT"));
     const ProString targetBase = targetFileInfo.path() + '/' + targetFileInfo.completeBaseName();
     if (project->first("TEMPLATE") == "lib" && project->isActiveConfig("shared")) {
         project->values("QMAKE_CLEAN").append(targetBase + ".exp");
diff --git a/qmake/library/proitems.h b/qmake/library/proitems.h
index 333f9ed889..09c5504fdf 100644
--- a/qmake/library/proitems.h
+++ b/qmake/library/proitems.h
@@ -70,9 +70,16 @@ public:
     ProString();
     ProString(const ProString &other);
     ProString &operator=(const ProString &) = default;
-    PROITEM_EXPLICIT ProString(const QString &str);
+    template<typename A, typename B>
+    ProString &operator=(const QStringBuilder<A, B> &str)
+    { return *this = QString(str); }
+    ProString(const QString &str);
     PROITEM_EXPLICIT ProString(const QStringRef &str);
     PROITEM_EXPLICIT ProString(const char *str);
+    template<typename A, typename B>
+    ProString(const QStringBuilder<A, B> &str)
+        : ProString(QString(str))
+    {}
     ProString(const QString &str, int offset, int length);
     void setValue(const QString &str);
     void clear() { m_string.clear(); m_length = 0; }
@@ -83,12 +90,16 @@ public:
     ProString &prepend(const ProString &other);
     ProString &append(const ProString &other, bool *pending = nullptr);
     ProString &append(const QString &other) { return append(ProString(other)); }
+    template<typename A, typename B>
+    ProString &append(const QStringBuilder<A, B> &other) { return append(QString(other)); }
     ProString &append(const QLatin1String other);
     ProString &append(const char *other) { return append(QLatin1String(other)); }
     ProString &append(QChar other);
     ProString &append(const ProStringList &other, bool *pending = nullptr, bool skipEmpty1st = false);
     ProString &operator+=(const ProString &other) { return append(other); }
     ProString &operator+=(const QString &other) { return append(other); }
+    template<typename A, typename B>
+    ProString &operator+=(const QStringBuilder<A, B> &other) { return append(QString(other)); }
     ProString &operator+=(const QLatin1String other) { return append(other); }
     ProString &operator+=(const char *other) { return append(other); }
     ProString &operator+=(QChar other) { return append(other); }
@@ -123,9 +134,13 @@ public:
     bool startsWith(const QString &sub, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().startsWith(sub, cs); }
     bool startsWith(const char *sub, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().startsWith(QLatin1String(sub), cs); }
     bool startsWith(QChar c, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().startsWith(c, cs); }
+    template<typename A, typename B>
+    bool startsWith(const QStringBuilder<A, B> &str) { return startsWith(QString(str)); }
     bool endsWith(const ProString &sub, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().endsWith(sub.toQStringRef(), cs); }
     bool endsWith(const QString &sub, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().endsWith(sub, cs); }
     bool endsWith(const char *sub, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().endsWith(QLatin1String(sub), cs); }
+    template<typename A, typename B>
+    bool endsWith(const QStringBuilder<A, B> &str) { return endsWith(QString(str)); }
     bool endsWith(QChar c, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().endsWith(c, cs); }
     int indexOf(const QString &s, int from = 0, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().indexOf(s, from, cs); }
     int indexOf(const char *s, int from = 0, Qt::CaseSensitivity cs = Qt::CaseSensitive) const { return toQStringRef().indexOf(QLatin1String(s), from, cs); }
@@ -179,10 +194,15 @@ private:
 };
 Q_DECLARE_TYPEINFO(ProString, Q_MOVABLE_TYPE);
 
+
 class ProKey : public ProString {
 public:
     ALWAYS_INLINE ProKey() : ProString() {}
     explicit ProKey(const QString &str);
+    template<typename A, typename B>
+    ProKey(const QStringBuilder<A, B> &str)
+        : ProString(str)
+    {}
     PROITEM_EXPLICIT ProKey(const char *str);
     ProKey(const QString &str, int off, int len);
     ProKey(const QString &str, int off, int len, uint hash);
@@ -206,31 +226,43 @@ private:
 };
 Q_DECLARE_TYPEINFO(ProKey, Q_MOVABLE_TYPE);
 
+template <> struct QConcatenable<ProString> : private QAbstractConcatenable
+{
+    typedef ProString type;
+    typedef QString ConvertTo;
+    enum { ExactSize = true };
+    static int size(const ProString &a) { return a.length(); }
+    static inline void appendTo(const ProString &a, QChar *&out)
+    {
+        const auto n = a.size();
+        memcpy(out, a.toQStringView().data(), sizeof(QChar) * n);
+        out += n;
+    }
+};
+
+template <> struct QConcatenable<ProKey> : private QAbstractConcatenable
+{
+    typedef ProKey type;
+    typedef QString ConvertTo;
+    enum { ExactSize = true };
+    static int size(const ProKey &a) { return a.length(); }
+    static inline void appendTo(const ProKey &a, QChar *&out)
+    {
+        const auto n = a.size();
+        memcpy(out, a.toQStringView().data(), sizeof(QChar) * n);
+        out += n;
+    }
+};
+
+
 size_t qHash(const ProString &str);
-QString operator+(const ProString &one, const ProString &two);
-inline QString operator+(const ProString &one, const QString &two)
-    { return one.toQStringRef() + two; }
-inline QString operator+(const QString &one, const ProString &two)
-    { return one + two.toQStringRef(); }
-
-inline QString operator+(const ProString &one, const char *two)
-    { return one.toQStringRef() + QLatin1String(two); }
-inline QString operator+(const char *one, const ProString &two)
-    { return QLatin1String(one) + two.toQStringRef(); }
-inline QString operator+(const ProString &one, QChar two)
-    { return one.toQStringRef() + two; }
-inline QString operator+(QChar one, const ProString &two)
-    { return one + two.toQStringRef(); }
 
 inline QString &operator+=(QString &that, const ProString &other)
     { return that += other.toQStringRef(); }
 
-inline bool operator==(const QString &that, const ProString &other)
-    { return other == that; }
-inline bool operator!=(const QString &that, const ProString &other)
-    { return !(other == that); }
-
 QTextStream &operator<<(QTextStream &t, const ProString &str);
+template<typename A, typename B>
+QTextStream &operator<<(QTextStream &t, const QStringBuilder<A, B> &str) { return t << QString(str); }
 
 // This class manages read-only access to a ProString via a raw data QString
 // temporary, ensuring that the latter is accessed exclusively.
@@ -296,6 +328,8 @@ public:
     QString join(const ProString &sep) const;
     QString join(const QString &sep) const;
     QString join(QChar sep) const;
+    template<typename A, typename B>
+    QString join(const QStringBuilder<A, B> &str) { return join(QString(str)); }
 
     void insertUnique(const ProStringList &value);
 
diff --git a/qmake/qmake.pro b/qmake/qmake.pro
index 53e0811098..d1532af0d2 100644
--- a/qmake/qmake.pro
+++ b/qmake/qmake.pro
@@ -10,6 +10,7 @@ DEFINES += \
     PROEVALUATOR_FULL \
     QT_BOOTSTRAPPED \
     QT_BUILD_QMAKE \
+    QT_USE_QSTRINGBUILDER \
     QT_NO_FOREACH \
     $$shell_quote(QT_VERSION_STR=\"$$QT_VERSION\") \
     QT_VERSION_MAJOR=$$QT_MAJOR_VERSION \
@@ -153,6 +154,7 @@ SOURCES += \
     qromancalendar.cpp \
     qsettings.cpp \
     qstring.cpp \
+    qstringbuilder.cpp \
     qstringlist.cpp \
     qsystemerror.cpp \
     qtemporaryfile.cpp \
@@ -209,6 +211,7 @@ HEADERS += \
     qregexp.h \
     qromancalendar_p.h \
     qstring.h \
+    qstringbuilder.h \
     qstringlist.h \
     qstringmatcher.h \
     qsystemerror_p.h \
diff --git a/tests/auto/tools/qmakelib/CMakeLists.txt b/tests/auto/tools/qmakelib/CMakeLists.txt
index 1e56c81e77..abb8e62c95 100644
--- a/tests/auto/tools/qmakelib/CMakeLists.txt
+++ b/tests/auto/tools/qmakelib/CMakeLists.txt
@@ -21,6 +21,7 @@ add_qt_test(tst_qmakelib
         PROEVALUATOR_FULL
         PROEVALUATOR_SETENV
         PROPARSER_DEBUG
+        QT_USE_QSTRINGBUILDER
     INCLUDE_DIRECTORIES
         ../../../../qmake/library
 )
diff --git a/tests/auto/tools/qmakelib/qmakelib.pro b/tests/auto/tools/qmakelib/qmakelib.pro
index 5e9e9fe637..0e39d3115e 100644
--- a/tests/auto/tools/qmakelib/qmakelib.pro
+++ b/tests/auto/tools/qmakelib/qmakelib.pro
@@ -22,4 +22,4 @@ SOURCES += \
     qmakebuiltins.cpp \
     qmakeevaluator.cpp
 
-DEFINES += PROPARSER_DEBUG PROEVALUATOR_FULL PROEVALUATOR_SETENV
+DEFINES += PROPARSER_DEBUG PROEVALUATOR_FULL PROEVALUATOR_SETENV QT_USE_QSTRINGBUILDER