diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000000..183f5b46cc1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "src/3rdparty/v8"]
+	path = src/3rdparty/v8
+	url = git://github.com/aaronkennedy/v8.git
diff --git a/bin/syncqt b/bin/syncqt
index 4eab929b309..f28b2bf60a1 100755
--- a/bin/syncqt
+++ b/bin/syncqt
@@ -33,7 +33,7 @@ $qtbasedir = dirname(dirname($0)) if (!$qtbasedir);
 $qtbasedir =~ s=\\=/=g if (defined $qtbasedir);
 
 # will be defined based on the modules sync.profile
-our (%modules, %moduleheaders, %classnames, %mastercontent, %modulepris);
+our (%modules, %moduleheaders, @allmoduleheadersprivate, %classnames, %mastercontent, %modulepris);
 
 # global variables (modified by options)
 my $isunix = 0;
@@ -792,6 +792,8 @@ loadSyncProfile(\$basedir, \$out_basedir);
 
 @modules_to_sync = keys(%modules) if($#modules_to_sync == -1);
 
+my %allmoduleheadersprivate = map { $_ => 1 } @allmoduleheadersprivate;
+
 $isunix = checkUnix; #cache checkUnix
 
 # create path
@@ -828,6 +830,9 @@ foreach my $lib (@modules_to_sync) {
     my $pathtoheaders = "";
     $pathtoheaders = $moduleheaders{$lib} if ($moduleheaders{$lib});
 
+    my $allheadersprivate = 0;
+    $allheadersprivate = 1 if $allmoduleheadersprivate{$lib};
+
     #information used after the syncing
     my $pri_install_classes = "";
     my $pri_install_files = "";
@@ -955,7 +960,7 @@ foreach my $lib (@modules_to_sync) {
                     my $header_copies = 0;
                     #figure out if it is a public header
                     my $public_header = $header;
-                    if($public_header =~ /_p.h$/ || $public_header =~ /_pch.h$/) {
+                    if($allheadersprivate || $public_header =~ /_p.h$/ || $public_header =~ /_pch.h$/) {
                         $public_header = 0;
                     } else {
                         foreach (@ignore_for_master_contents) {
diff --git a/config.tests/x11/fontconfig/fontconfig.pro b/config.tests/x11/fontconfig/fontconfig.pro
index 718a8204bc7..83607740355 100644
--- a/config.tests/x11/fontconfig/fontconfig.pro
+++ b/config.tests/x11/fontconfig/fontconfig.pro
@@ -1,5 +1,4 @@
 SOURCES = fontconfig.cpp
-CONFIG += x11
 CONFIG -= qt
 LIBS += -lfreetype -lfontconfig
 include(../../unix/freetype/freetype.pri)
diff --git a/configure b/configure
index 7f8491ed703..6a7027e46a5 100755
--- a/configure
+++ b/configure
@@ -706,6 +706,7 @@ CFG_PHONON_BACKEND=yes
 CFG_MULTIMEDIA=auto
 CFG_AUDIO_BACKEND=auto
 CFG_SVG=auto
+CFG_V8=auto
 CFG_DECLARATIVE=auto
 CFG_DECLARATIVE_DEBUG=yes
 CFG_WEBKIT=auto # (yes|no|auto|debug)
@@ -2122,6 +2123,17 @@ while [ "$#" -gt 0 ]; do
             fi
         fi
         ;;
+    v8)
+        if [ "$VAL" = "yes" ]; then
+            CFG_V8="yes"
+        else
+            if [ "$VAL" = "no" ]; then
+                CFG_V8="no"
+            else
+                UNKNOWN_OPT=yes
+            fi
+        fi
+        ;;
     declarative)
         if [ "$VAL" = "yes" ]; then
             CFG_DECLARATIVE="yes"
@@ -3896,6 +3908,9 @@ fi
     -no-scripttools .... Do not build the QtScriptTools module.
  +  -scripttools ....... Build the QtScriptTools module.
 
+    -no-v8 ............. Do not build the V8 module.
+ +  -v8 ................ Build the V8 module.
+
     -no-declarative ..... Do not build the declarative module.
  +  -declarative ....... Build the declarative module.
 
@@ -7579,9 +7594,19 @@ fi
 #fi
 
 
+if [ "$CFG_V8" = "auto" ]; then
+    CFG_V8=yes
+fi
+
+if [ "$CFG_V8" = "no" ]; then
+    QCONFIG_FLAGS="$QCONFIG_FLAGS QT_NO_V8"
+else
+    QT_CONFIG="$QT_CONFIG v8"
+fi
+
 if [ "$CFG_DECLARATIVE" = "yes" ]; then
-    if [ "$CFG_SCRIPT" = "no" -o "$CFG_GUI" = "no" ]; then
-        echo "Error: QtDeclarative was requested, but it can't be built due to QtScript or QtGui being disabled."
+    if [ "$CFG_V8" = "no" -o "$CFG_GUI" = "no" ]; then
+        echo "Error: QtDeclarative was requested, but it can't be built due to QtV8 or QtGui being disabled."
         exit 1
     fi
 fi
@@ -8629,6 +8654,7 @@ if [ "$CFG_WEBKIT" != "no" ] || [ "$CFG_SCRIPT" != "no" ]; then
         echo "JavaScriptCore JIT ..... $CFG_JAVASCRIPTCORE_JIT"
     fi
 fi
+echo "V8 module .............. $CFG_V8"
 echo "Declarative module ..... $CFG_DECLARATIVE"
 if [ "$CFG_DECLARATIVE" = "yes" ]; then
     echo "Declarative debugging ...$CFG_DECLARATIVE_DEBUG"
diff --git a/src/3rdparty/v8 b/src/3rdparty/v8
new file mode 160000
index 00000000000..dc2cad4f8fc
--- /dev/null
+++ b/src/3rdparty/v8
@@ -0,0 +1 @@
+Subproject commit dc2cad4f8fc88c52fcea09b8d0262d35cd32dc44
diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index 2d280f14f76..0f314d45f16 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -147,6 +147,7 @@ private:
 void (*QAbstractDeclarativeData::destroyed)(QAbstractDeclarativeData *, QObject *) = 0;
 void (*QAbstractDeclarativeData::parentChanged)(QAbstractDeclarativeData *, QObject *, QObject *) = 0;
 void (*QAbstractDeclarativeData::objectNameChanged)(QAbstractDeclarativeData *, QObject *) = 0;
+void (*QAbstractDeclarativeData::signalEmitted)(QAbstractDeclarativeData *, QObject *, int, void **) = 0;
 
 QObjectData::~QObjectData() {}
 
@@ -3271,6 +3272,10 @@ void QMetaObject::activate(QObject *sender, const QMetaObject *m, int local_sign
 
     int signal_index = signalOffset + local_signal_index;
 
+    if (sender->d_func()->declarativeData && QAbstractDeclarativeData::signalEmitted)
+        QAbstractDeclarativeData::signalEmitted(sender->d_func()->declarativeData, sender, 
+                                                methodOffset + local_signal_index, argv);
+
     if (!sender->d_func()->isSignalConnected(signal_index))
         return; // nothing connected to these signals, and no spy
 
diff --git a/src/corelib/kernel/qobject_p.h b/src/corelib/kernel/qobject_p.h
index 9151e8eb7b4..e7233c5ba9a 100644
--- a/src/corelib/kernel/qobject_p.h
+++ b/src/corelib/kernel/qobject_p.h
@@ -91,6 +91,7 @@ public:
     static void (*destroyed)(QAbstractDeclarativeData *, QObject *);
     static void (*parentChanged)(QAbstractDeclarativeData *, QObject *, QObject *);
     static void (*objectNameChanged)(QAbstractDeclarativeData *, QObject *);
+    static void (*signalEmitted)(QAbstractDeclarativeData *, QObject *, int, void **);
 };
 
 class Q_CORE_EXPORT QObjectPrivate : public QObjectData
diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp
index cef92af66ba..1797564a98d 100644
--- a/src/gui/math3d/qmatrix4x4.cpp
+++ b/src/gui/math3d/qmatrix4x4.cpp
@@ -209,7 +209,7 @@ QMatrix4x4::QMatrix4x4(const QMatrix& matrix)
     m[3][1] = matrix.dy();
     m[3][2] = 0.0f;
     m[3][3] = 1.0f;
-    flagBits = General;
+    flagBits = Translation | Scale | Rotation2D;
 }
 
 /*!
@@ -316,6 +316,12 @@ QMatrix4x4::QMatrix4x4(const QTransform& transform)
     Fills all elements of this matrx with \a value.
 */
 
+static inline qreal matrixDet2(const qreal m[4][4], int col0, int col1, int row0, int row1)
+{
+    return m[col0][row0] * m[col1][row1] - m[col0][row1] * m[col1][row0];
+}
+
+
 // The 4x4 matrix inverse algorithm is based on that described at:
 // http://www.j3d.org/matrix_faq/matrfaq_latest.html#Q24
 // Some optimization has been done to avoid making copies of 3x3
@@ -329,15 +335,9 @@ static inline qreal matrixDet3
     (const qreal m[4][4], int col0, int col1, int col2,
      int row0, int row1, int row2)
 {
-    return m[col0][row0] *
-                (m[col1][row1] * m[col2][row2] -
-                 m[col1][row2] * m[col2][row1]) -
-           m[col1][row0] *
-                (m[col0][row1] * m[col2][row2] -
-                 m[col0][row2] * m[col2][row1]) +
-           m[col2][row0] *
-                (m[col0][row1] * m[col1][row2] -
-                 m[col0][row2] * m[col1][row1]);
+    return m[col0][row0] * matrixDet2(m, col1, col2, row1, row2)
+            - m[col1][row0] * matrixDet2(m, col0, col2, row1, row2)
+            + m[col2][row0] * matrixDet2(m, col0, col1, row1, row2);
 }
 
 // Calculate the determinant of a 4x4 matrix.
@@ -356,7 +356,13 @@ static inline qreal matrixDet4(const qreal m[4][4])
 */
 qreal QMatrix4x4::determinant() const
 {
-    return qreal(matrixDet4(m));
+    if ((flagBits & ~(Translation | Rotation2D | Rotation)) == Identity)
+        return 1;
+    if (flagBits < Rotation2D)
+        return m[0][0] * m[1][1] * m[2][2]; // Translation | Scale
+    if (flagBits < Perspective)
+        return matrixDet3(m, 0, 1, 2, 0, 1, 2);
+    return matrixDet4(m);
 }
 
 /*!
@@ -387,10 +393,61 @@ QMatrix4x4 QMatrix4x4::inverted(bool *invertible) const
         if (invertible)
             *invertible = true;
         return inv;
-    } else if (flagBits == Rotation || flagBits == (Rotation | Translation)) {
+    } else if (flagBits < Rotation2D) {
+        // Translation | Scale
+        if (m[0][0] == 0 || m[1][1] == 0 || m[2][2] == 0) {
+            if (invertible)
+                *invertible = false;
+            return QMatrix4x4();
+        }
+        QMatrix4x4 inv;
+        inv.m[0][0] = 1.0f / m[0][0];
+        inv.m[1][1] = 1.0f / m[1][1];
+        inv.m[2][2] = 1.0f / m[2][2];
+        inv.m[3][0] = -m[3][0] * inv.m[0][0];
+        inv.m[3][1] = -m[3][1] * inv.m[1][1];
+        inv.m[3][2] = -m[3][2] * inv.m[2][2];
+        inv.flagBits = flagBits;
+
+        if (invertible)
+            *invertible = true;
+        return inv;
+    } else if ((flagBits & ~(Translation | Rotation2D | Rotation)) == Identity) {
         if (invertible)
             *invertible = true;
         return orthonormalInverse();
+    } else if (flagBits < Perspective) {
+        QMatrix4x4 inv(1); // The "1" says to not load the identity.
+
+        qreal det = matrixDet3(m, 0, 1, 2, 0, 1, 2);
+        if (det == 0.0f) {
+            if (invertible)
+                *invertible = false;
+            return QMatrix4x4();
+        }
+        det = 1.0f / det;
+
+        inv.m[0][0] =  matrixDet2(m, 1, 2, 1, 2) * det;
+        inv.m[0][1] = -matrixDet2(m, 0, 2, 1, 2) * det;
+        inv.m[0][2] =  matrixDet2(m, 0, 1, 1, 2) * det;
+        inv.m[0][3] = 0;
+        inv.m[1][0] = -matrixDet2(m, 1, 2, 0, 2) * det;
+        inv.m[1][1] =  matrixDet2(m, 0, 2, 0, 2) * det;
+        inv.m[1][2] = -matrixDet2(m, 0, 1, 0, 2) * det;
+        inv.m[1][3] = 0;
+        inv.m[2][0] =  matrixDet2(m, 1, 2, 0, 1) * det;
+        inv.m[2][1] = -matrixDet2(m, 0, 2, 0, 1) * det;
+        inv.m[2][2] =  matrixDet2(m, 0, 1, 0, 1) * det;
+        inv.m[2][3] = 0;
+        inv.m[3][0] = -inv.m[0][0] * m[3][0] - inv.m[1][0] * m[3][1] - inv.m[2][0] * m[3][2];
+        inv.m[3][1] = -inv.m[0][1] * m[3][0] - inv.m[1][1] * m[3][1] - inv.m[2][1] * m[3][2];
+        inv.m[3][2] = -inv.m[0][2] * m[3][0] - inv.m[1][2] * m[3][1] - inv.m[2][2] * m[3][2];
+        inv.m[3][3] = 1;
+        inv.flagBits = flagBits;
+
+        if (invertible)
+            *invertible = true;
+        return inv;
     }
 
     QMatrix4x4 inv(1); // The "1" says to not load the identity.
@@ -419,6 +476,7 @@ QMatrix4x4 QMatrix4x4::inverted(bool *invertible) const
     inv.m[3][1] =  matrixDet3(m, 0, 2, 3, 0, 1, 2) * det;
     inv.m[3][2] = -matrixDet3(m, 0, 1, 3, 0, 1, 2) * det;
     inv.m[3][3] =  matrixDet3(m, 0, 1, 2, 0, 1, 2) * det;
+    inv.flagBits = flagBits;
 
     if (invertible)
         *invertible = true;
@@ -438,15 +496,29 @@ QMatrix3x3 QMatrix4x4::normalMatrix() const
     QMatrix3x3 inv;
 
     // Handle the simple cases first.
-    if (flagBits == Identity || flagBits == Translation) {
+    if (flagBits < Scale) {
+        // Translation
         return inv;
-    } else if (flagBits == Scale || flagBits == (Translation | Scale)) {
+    } else if (flagBits < Rotation2D) {
+        // Translation | Scale
         if (m[0][0] == 0.0f || m[1][1] == 0.0f || m[2][2] == 0.0f)
             return inv;
         inv.data()[0] = 1.0f / m[0][0];
         inv.data()[4] = 1.0f / m[1][1];
         inv.data()[8] = 1.0f / m[2][2];
         return inv;
+    } else if ((flagBits & ~(Translation | Rotation2D | Rotation)) == Identity) {
+        qreal *invm = inv.data();
+        invm[0 + 0 * 3] = m[0][0];
+        invm[1 + 0 * 3] = m[0][1];
+        invm[2 + 0 * 3] = m[0][2];
+        invm[0 + 1 * 3] = m[1][0];
+        invm[1 + 1 * 3] = m[1][1];
+        invm[2 + 1 * 3] = m[1][2];
+        invm[0 + 2 * 3] = m[2][0];
+        invm[1 + 2 * 3] = m[2][1];
+        invm[2 + 2 * 3] = m[2][2];
+        return inv;
     }
 
     qreal det = matrixDet3(m, 0, 1, 2, 0, 1, 2);
@@ -481,6 +553,8 @@ QMatrix4x4 QMatrix4x4::transposed() const
             result.m[col][row] = m[row][col];
         }
     }
+    // When a translation is transposed, it becomes a perspective transformation.
+    result.flagBits = (flagBits & Translation ? General : flagBits);
     return result;
 }
 
@@ -689,6 +763,7 @@ QMatrix4x4 operator/(const QMatrix4x4& matrix, qreal divisor)
     m.m[3][1] = matrix.m[3][1] / divisor;
     m.m[3][2] = matrix.m[3][2] / divisor;
     m.m[3][3] = matrix.m[3][3] / divisor;
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
@@ -713,20 +788,20 @@ void QMatrix4x4::scale(const QVector3D& vector)
     qreal vx = vector.x();
     qreal vy = vector.y();
     qreal vz = vector.z();
-    if (flagBits == Identity) {
+    if (flagBits < Scale) {
         m[0][0] = vx;
         m[1][1] = vy;
         m[2][2] = vz;
-        flagBits = Scale;
-    } else if (flagBits == Scale || flagBits == (Scale | Translation)) {
+    } else if (flagBits < Rotation2D) {
         m[0][0] *= vx;
         m[1][1] *= vy;
         m[2][2] *= vz;
-    } else if (flagBits == Translation) {
-        m[0][0] = vx;
-        m[1][1] = vy;
-        m[2][2] = vz;
-        flagBits |= Scale;
+    } else if (flagBits < Rotation) {
+        m[0][0] *= vx;
+        m[0][1] *= vx;
+        m[1][0] *= vy;
+        m[1][1] *= vy;
+        m[2][2] *= vz;
     } else {
         m[0][0] *= vx;
         m[0][1] *= vx;
@@ -740,9 +815,10 @@ void QMatrix4x4::scale(const QVector3D& vector)
         m[2][1] *= vz;
         m[2][2] *= vz;
         m[2][3] *= vz;
-        flagBits = General;
     }
+    flagBits |= Scale;
 }
+
 #endif
 
 /*!
@@ -755,17 +831,17 @@ void QMatrix4x4::scale(const QVector3D& vector)
 */
 void QMatrix4x4::scale(qreal x, qreal y)
 {
-    if (flagBits == Identity) {
+    if (flagBits < Scale) {
         m[0][0] = x;
         m[1][1] = y;
-        flagBits = Scale;
-    } else if (flagBits == Scale || flagBits == (Scale | Translation)) {
+    } else if (flagBits < Rotation2D) {
         m[0][0] *= x;
         m[1][1] *= y;
-    } else if (flagBits == Translation) {
-        m[0][0] = x;
-        m[1][1] = y;
-        flagBits |= Scale;
+    } else if (flagBits < Rotation) {
+        m[0][0] *= x;
+        m[0][1] *= x;
+        m[1][0] *= y;
+        m[1][1] *= y;
     } else {
         m[0][0] *= x;
         m[0][1] *= x;
@@ -775,8 +851,8 @@ void QMatrix4x4::scale(qreal x, qreal y)
         m[1][1] *= y;
         m[1][2] *= y;
         m[1][3] *= y;
-        flagBits = General;
     }
+    flagBits |= Scale;
 }
 
 /*!
@@ -789,20 +865,20 @@ void QMatrix4x4::scale(qreal x, qreal y)
 */
 void QMatrix4x4::scale(qreal x, qreal y, qreal z)
 {
-    if (flagBits == Identity) {
+    if (flagBits < Scale) {
         m[0][0] = x;
         m[1][1] = y;
         m[2][2] = z;
-        flagBits = Scale;
-    } else if (flagBits == Scale || flagBits == (Scale | Translation)) {
+    } else if (flagBits < Rotation2D) {
         m[0][0] *= x;
         m[1][1] *= y;
         m[2][2] *= z;
-    } else if (flagBits == Translation) {
-        m[0][0] = x;
-        m[1][1] = y;
-        m[2][2] = z;
-        flagBits |= Scale;
+    } else if (flagBits < Rotation) {
+        m[0][0] *= x;
+        m[0][1] *= x;
+        m[1][0] *= y;
+        m[1][1] *= y;
+        m[2][2] *= z;
     } else {
         m[0][0] *= x;
         m[0][1] *= x;
@@ -816,8 +892,8 @@ void QMatrix4x4::scale(qreal x, qreal y, qreal z)
         m[2][1] *= z;
         m[2][2] *= z;
         m[2][3] *= z;
-        flagBits = General;
     }
+    flagBits |= Scale;
 }
 
 /*!
@@ -830,20 +906,20 @@ void QMatrix4x4::scale(qreal x, qreal y, qreal z)
 */
 void QMatrix4x4::scale(qreal factor)
 {
-    if (flagBits == Identity) {
+    if (flagBits < Scale) {
         m[0][0] = factor;
         m[1][1] = factor;
         m[2][2] = factor;
-        flagBits = Scale;
-    } else if (flagBits == Scale || flagBits == (Scale | Translation)) {
+    } else if (flagBits < Rotation2D) {
         m[0][0] *= factor;
         m[1][1] *= factor;
         m[2][2] *= factor;
-    } else if (flagBits == Translation) {
-        m[0][0] = factor;
-        m[1][1] = factor;
-        m[2][2] = factor;
-        flagBits |= Scale;
+    } else if (flagBits < Rotation) {
+        m[0][0] *= factor;
+        m[0][1] *= factor;
+        m[1][0] *= factor;
+        m[1][1] *= factor;
+        m[2][2] *= factor;
     } else {
         m[0][0] *= factor;
         m[0][1] *= factor;
@@ -857,8 +933,8 @@ void QMatrix4x4::scale(qreal factor)
         m[2][1] *= factor;
         m[2][2] *= factor;
         m[2][3] *= factor;
-        flagBits = General;
     }
+    flagBits |= Scale;
 }
 
 #ifndef QT_NO_VECTOR3D
@@ -868,6 +944,7 @@ void QMatrix4x4::scale(qreal factor)
 
     \sa scale(), rotate()
 */
+
 void QMatrix4x4::translate(const QVector3D& vector)
 {
     qreal vx = vector.x();
@@ -877,7 +954,6 @@ void QMatrix4x4::translate(const QVector3D& vector)
         m[3][0] = vx;
         m[3][1] = vy;
         m[3][2] = vz;
-        flagBits = Translation;
     } else if (flagBits == Translation) {
         m[3][0] += vx;
         m[3][1] += vy;
@@ -886,23 +962,22 @@ void QMatrix4x4::translate(const QVector3D& vector)
         m[3][0] = m[0][0] * vx;
         m[3][1] = m[1][1] * vy;
         m[3][2] = m[2][2] * vz;
-        flagBits |= Translation;
-    } else if (flagBits == (Scale | Translation)) {
+    } else if (flagBits == (Translation | Scale)) {
         m[3][0] += m[0][0] * vx;
         m[3][1] += m[1][1] * vy;
         m[3][2] += m[2][2] * vz;
+    } else if (flagBits < Rotation) {
+        m[3][0] += m[0][0] * vx + m[1][0] * vy;
+        m[3][1] += m[0][1] * vx + m[1][1] * vy;
+        m[3][2] += m[2][2] * vz;
     } else {
         m[3][0] += m[0][0] * vx + m[1][0] * vy + m[2][0] * vz;
         m[3][1] += m[0][1] * vx + m[1][1] * vy + m[2][1] * vz;
         m[3][2] += m[0][2] * vx + m[1][2] * vy + m[2][2] * vz;
         m[3][3] += m[0][3] * vx + m[1][3] * vy + m[2][3] * vz;
-        if (flagBits == Rotation)
-            flagBits |= Translation;
-        else if (flagBits != (Rotation | Translation))
-            flagBits = General;
     }
+    flagBits |= Translation;
 }
-
 #endif
 
 /*!
@@ -918,28 +993,25 @@ void QMatrix4x4::translate(qreal x, qreal y)
     if (flagBits == Identity) {
         m[3][0] = x;
         m[3][1] = y;
-        flagBits = Translation;
     } else if (flagBits == Translation) {
         m[3][0] += x;
         m[3][1] += y;
     } else if (flagBits == Scale) {
         m[3][0] = m[0][0] * x;
         m[3][1] = m[1][1] * y;
-        m[3][2] = 0.;
-        flagBits |= Translation;
-    } else if (flagBits == (Scale | Translation)) {
+    } else if (flagBits == (Translation | Scale)) {
         m[3][0] += m[0][0] * x;
         m[3][1] += m[1][1] * y;
+    } else if (flagBits < Rotation) {
+        m[3][0] += m[0][0] * x + m[1][0] * y;
+        m[3][1] += m[0][1] * x + m[1][1] * y;
     } else {
         m[3][0] += m[0][0] * x + m[1][0] * y;
         m[3][1] += m[0][1] * x + m[1][1] * y;
         m[3][2] += m[0][2] * x + m[1][2] * y;
         m[3][3] += m[0][3] * x + m[1][3] * y;
-        if (flagBits == Rotation)
-            flagBits |= Translation;
-        else if (flagBits != (Rotation | Translation))
-            flagBits = General;
     }
+    flagBits |= Translation;
 }
 
 /*!
@@ -956,7 +1028,6 @@ void QMatrix4x4::translate(qreal x, qreal y, qreal z)
         m[3][0] = x;
         m[3][1] = y;
         m[3][2] = z;
-        flagBits = Translation;
     } else if (flagBits == Translation) {
         m[3][0] += x;
         m[3][1] += y;
@@ -965,31 +1036,31 @@ void QMatrix4x4::translate(qreal x, qreal y, qreal z)
         m[3][0] = m[0][0] * x;
         m[3][1] = m[1][1] * y;
         m[3][2] = m[2][2] * z;
-        flagBits |= Translation;
-    } else if (flagBits == (Scale | Translation)) {
+    } else if (flagBits == (Translation | Scale)) {
         m[3][0] += m[0][0] * x;
         m[3][1] += m[1][1] * y;
         m[3][2] += m[2][2] * z;
+    } else if (flagBits < Rotation) {
+        m[3][0] += m[0][0] * x + m[1][0] * y;
+        m[3][1] += m[0][1] * x + m[1][1] * y;
+        m[3][2] += m[2][2] * z;
     } else {
         m[3][0] += m[0][0] * x + m[1][0] * y + m[2][0] * z;
         m[3][1] += m[0][1] * x + m[1][1] * y + m[2][1] * z;
         m[3][2] += m[0][2] * x + m[1][2] * y + m[2][2] * z;
         m[3][3] += m[0][3] * x + m[1][3] * y + m[2][3] * z;
-        if (flagBits == Rotation)
-            flagBits |= Translation;
-        else if (flagBits != (Rotation | Translation))
-            flagBits = General;
     }
+    flagBits |= Translation;
 }
 
 #ifndef QT_NO_VECTOR3D
-
 /*!
     Multiples this matrix by another that rotates coordinates through
     \a angle degrees about \a vector.
 
     \sa scale(), translate()
 */
+
 void QMatrix4x4::rotate(qreal angle, const QVector3D& vector)
 {
     rotate(angle, vector.x(), vector.y(), vector.z());
@@ -1009,8 +1080,7 @@ void QMatrix4x4::rotate(qreal angle, qreal x, qreal y, qreal z)
 {
     if (angle == 0.0f)
         return;
-    QMatrix4x4 m(1); // The "1" says to not load the identity.
-    qreal c, s, ic;
+    qreal c, s;
     if (angle == 90.0f || angle == -270.0f) {
         s = 1.0f;
         c = 0.0f;
@@ -1025,86 +1095,87 @@ void QMatrix4x4::rotate(qreal angle, qreal x, qreal y, qreal z)
         c = qCos(a);
         s = qSin(a);
     }
-    bool quick = false;
     if (x == 0.0f) {
         if (y == 0.0f) {
             if (z != 0.0f) {
                 // Rotate around the Z axis.
-                m.setToIdentity();
-                m.m[0][0] = c;
-                m.m[1][1] = c;
-                if (z < 0.0f) {
-                    m.m[1][0] = s;
-                    m.m[0][1] = -s;
-                } else {
-                    m.m[1][0] = -s;
-                    m.m[0][1] = s;
-                }
-                m.flagBits = General;
-                quick = true;
+                if (z < 0)
+                    s = -s;
+                qreal tmp;
+                m[0][0] = (tmp = m[0][0]) * c + m[1][0] * s;
+                m[1][0] = m[1][0] * c - tmp * s;
+                m[0][1] = (tmp = m[0][1]) * c + m[1][1] * s;
+                m[1][1] = m[1][1] * c - tmp * s;
+                m[0][2] = (tmp = m[0][2]) * c + m[1][2] * s;
+                m[1][2] = m[1][2] * c - tmp * s;
+                m[0][3] = (tmp = m[0][3]) * c + m[1][3] * s;
+                m[1][3] = m[1][3] * c - tmp * s;
+
+                flagBits |= Rotation2D;
+                return;
             }
         } else if (z == 0.0f) {
             // Rotate around the Y axis.
-            m.setToIdentity();
-            m.m[0][0] = c;
-            m.m[2][2] = c;
-            if (y < 0.0f) {
-                m.m[2][0] = -s;
-                m.m[0][2] = s;
-            } else {
-                m.m[2][0] = s;
-                m.m[0][2] = -s;
-            }
-            m.flagBits = General;
-            quick = true;
+            if (y < 0)
+                s = -s;
+            qreal tmp;
+            m[2][0] = (tmp = m[2][0]) * c + m[0][0] * s;
+            m[0][0] = m[0][0] * c - tmp * s;
+            m[2][1] = (tmp = m[2][1]) * c + m[0][1] * s;
+            m[0][1] = m[0][1] * c - tmp * s;
+            m[2][2] = (tmp = m[2][2]) * c + m[0][2] * s;
+            m[0][2] = m[0][2] * c - tmp * s;
+            m[2][3] = (tmp = m[2][3]) * c + m[0][3] * s;
+            m[0][3] = m[0][3] * c - tmp * s;
+
+            flagBits |= Rotation;
+            return;
         }
     } else if (y == 0.0f && z == 0.0f) {
         // Rotate around the X axis.
-        m.setToIdentity();
-        m.m[1][1] = c;
-        m.m[2][2] = c;
-        if (x < 0.0f) {
-            m.m[2][1] = s;
-            m.m[1][2] = -s;
-        } else {
-            m.m[2][1] = -s;
-            m.m[1][2] = s;
-        }
-        m.flagBits = General;
-        quick = true;
+        if (x < 0)
+            s = -s;
+        qreal tmp;
+        m[1][0] = (tmp = m[1][0]) * c + m[2][0] * s;
+        m[2][0] = m[2][0] * c - tmp * s;
+        m[1][1] = (tmp = m[1][1]) * c + m[2][1] * s;
+        m[2][1] = m[2][1] * c - tmp * s;
+        m[1][2] = (tmp = m[1][2]) * c + m[2][2] * s;
+        m[2][2] = m[2][2] * c - tmp * s;
+        m[1][3] = (tmp = m[1][3]) * c + m[2][3] * s;
+        m[2][3] = m[2][3] * c - tmp * s;
+
+        flagBits |= Rotation;
+        return;
     }
-    if (!quick) {
-        qreal len = x * x + y * y + z * z;
-        if (!qFuzzyIsNull(len - 1.0f) && !qFuzzyIsNull(len)) {
-            len = qSqrt(len);
-            x /= len;
-            y /= len;
-            z /= len;
-        }
-        ic = 1.0f - c;
-        m.m[0][0] = x * x * ic + c;
-        m.m[1][0] = x * y * ic - z * s;
-        m.m[2][0] = x * z * ic + y * s;
-        m.m[3][0] = 0.0f;
-        m.m[0][1] = y * x * ic + z * s;
-        m.m[1][1] = y * y * ic + c;
-        m.m[2][1] = y * z * ic - x * s;
-        m.m[3][1] = 0.0f;
-        m.m[0][2] = x * z * ic - y * s;
-        m.m[1][2] = y * z * ic + x * s;
-        m.m[2][2] = z * z * ic + c;
-        m.m[3][2] = 0.0f;
-        m.m[0][3] = 0.0f;
-        m.m[1][3] = 0.0f;
-        m.m[2][3] = 0.0f;
-        m.m[3][3] = 1.0f;
+
+    qreal len = x * x + y * y + z * z;
+    if (!qFuzzyCompare(len, qreal(1)) && !qFuzzyIsNull(len)) {
+        len = qSqrt(len);
+        x /= len;
+        y /= len;
+        z /= len;
     }
-    int flags = flagBits;
-    *this *= m;
-    if (flags != Identity)
-        flagBits = flags | Rotation;
-    else
-        flagBits = Rotation;
+    qreal ic = 1.0f - c;
+    QMatrix4x4 rot(1); // The "1" says to not load the identity.
+    rot.m[0][0] = x * x * ic + c;
+    rot.m[1][0] = x * y * ic - z * s;
+    rot.m[2][0] = x * z * ic + y * s;
+    rot.m[3][0] = 0.0f;
+    rot.m[0][1] = y * x * ic + z * s;
+    rot.m[1][1] = y * y * ic + c;
+    rot.m[2][1] = y * z * ic - x * s;
+    rot.m[3][1] = 0.0f;
+    rot.m[0][2] = x * z * ic - y * s;
+    rot.m[1][2] = y * z * ic + x * s;
+    rot.m[2][2] = z * z * ic + c;
+    rot.m[3][2] = 0.0f;
+    rot.m[0][3] = 0.0f;
+    rot.m[1][3] = 0.0f;
+    rot.m[2][3] = 0.0f;
+    rot.m[3][3] = 1.0f;
+    rot.flagBits = Rotation;
+    *this *= rot;
 }
 
 /*!
@@ -1116,8 +1187,7 @@ void QMatrix4x4::projectedRotate(qreal angle, qreal x, qreal y, qreal z)
     // and projection back to 2D in a single step.
     if (angle == 0.0f)
         return;
-    QMatrix4x4 m(1); // The "1" says to not load the identity.
-    qreal c, s, ic;
+    qreal c, s;
     if (angle == 90.0f || angle == -270.0f) {
         s = 1.0f;
         c = 0.0f;
@@ -1132,82 +1202,74 @@ void QMatrix4x4::projectedRotate(qreal angle, qreal x, qreal y, qreal z)
         c = qCos(a);
         s = qSin(a);
     }
-    bool quick = false;
     if (x == 0.0f) {
         if (y == 0.0f) {
             if (z != 0.0f) {
                 // Rotate around the Z axis.
-                m.setToIdentity();
-                m.m[0][0] = c;
-                m.m[1][1] = c;
-                if (z < 0.0f) {
-                    m.m[1][0] = s;
-                    m.m[0][1] = -s;
-                } else {
-                    m.m[1][0] = -s;
-                    m.m[0][1] = s;
-                }
-                m.flagBits = General;
-                quick = true;
+                if (z < 0)
+                    s = -s;
+                qreal tmp;
+                m[0][0] = (tmp = m[0][0]) * c + m[1][0] * s;
+                m[1][0] = m[1][0] * c - tmp * s;
+                m[0][1] = (tmp = m[0][1]) * c + m[1][1] * s;
+                m[1][1] = m[1][1] * c - tmp * s;
+                m[0][2] = (tmp = m[0][2]) * c + m[1][2] * s;
+                m[1][2] = m[1][2] * c - tmp * s;
+                m[0][3] = (tmp = m[0][3]) * c + m[1][3] * s;
+                m[1][3] = m[1][3] * c - tmp * s;
+
+                flagBits |= Rotation2D;
+                return;
             }
         } else if (z == 0.0f) {
             // Rotate around the Y axis.
-            m.setToIdentity();
-            m.m[0][0] = c;
-            m.m[2][2] = 1.0f;
-            if (y < 0.0f) {
-                m.m[0][3] = -s * inv_dist_to_plane;
-            } else {
-                m.m[0][3] = s * inv_dist_to_plane;
-            }
-            m.flagBits = General;
-            quick = true;
+            if (y < 0)
+                s = -s;
+            m[0][0] = m[0][0] * c + m[3][0] * s * inv_dist_to_plane;
+            m[0][1] = m[0][1] * c + m[3][1] * s * inv_dist_to_plane;
+            m[0][2] = m[0][2] * c + m[3][2] * s * inv_dist_to_plane;
+            m[0][3] = m[0][3] * c + m[3][3] * s * inv_dist_to_plane;
+            flagBits = General;
+            return;
         }
     } else if (y == 0.0f && z == 0.0f) {
         // Rotate around the X axis.
-        m.setToIdentity();
-        m.m[1][1] = c;
-        m.m[2][2] = 1.0f;
-        if (x < 0.0f) {
-            m.m[1][3] = s * inv_dist_to_plane;
-        } else {
-            m.m[1][3] = -s * inv_dist_to_plane;
-        }
-        m.flagBits = General;
-        quick = true;
+        if (x < 0)
+            s = -s;
+        m[1][0] = m[1][0] * c - m[3][0] * s * inv_dist_to_plane;
+        m[1][1] = m[1][1] * c - m[3][1] * s * inv_dist_to_plane;
+        m[1][2] = m[1][2] * c - m[3][2] * s * inv_dist_to_plane;
+        m[1][3] = m[1][3] * c - m[3][3] * s * inv_dist_to_plane;
+        flagBits = General;
+        return;
     }
-    if (!quick) {
-        qreal len = x * x + y * y + z * z;
-        if (!qFuzzyIsNull(len - 1.0f) && !qFuzzyIsNull(len)) {
-            len = qSqrt(len);
-            x /= len;
-            y /= len;
-            z /= len;
-        }
-        ic = 1.0f - c;
-        m.m[0][0] = x * x * ic + c;
-        m.m[1][0] = x * y * ic - z * s;
-        m.m[2][0] = 0.0f;
-        m.m[3][0] = 0.0f;
-        m.m[0][1] = y * x * ic + z * s;
-        m.m[1][1] = y * y * ic + c;
-        m.m[2][1] = 0.0f;
-        m.m[3][1] = 0.0f;
-        m.m[0][2] = 0.0f;
-        m.m[1][2] = 0.0f;
-        m.m[2][2] = 1.0f;
-        m.m[3][2] = 0.0f;
-        m.m[0][3] = (x * z * ic - y * s) * -inv_dist_to_plane;
-        m.m[1][3] = (y * z * ic + x * s) * -inv_dist_to_plane;
-        m.m[2][3] = 0.0f;
-        m.m[3][3] = 1.0f;
+    qreal len = x * x + y * y + z * z;
+    if (!qFuzzyIsNull(len - 1.0f) && !qFuzzyIsNull(len)) {
+        len = qSqrt(len);
+        x /= len;
+        y /= len;
+        z /= len;
     }
-    int flags = flagBits;
-    *this *= m;
-    if (flags != Identity)
-        flagBits = flags | Rotation;
-    else
-        flagBits = Rotation;
+    qreal ic = 1.0f - c;
+    QMatrix4x4 rot(1); // The "1" says to not load the identity.
+    rot.m[0][0] = x * x * ic + c;
+    rot.m[1][0] = x * y * ic - z * s;
+    rot.m[2][0] = 0.0f;
+    rot.m[3][0] = 0.0f;
+    rot.m[0][1] = y * x * ic + z * s;
+    rot.m[1][1] = y * y * ic + c;
+    rot.m[2][1] = 0.0f;
+    rot.m[3][1] = 0.0f;
+    rot.m[0][2] = 0.0f;
+    rot.m[1][2] = 0.0f;
+    rot.m[2][2] = 1.0f;
+    rot.m[3][2] = 0.0f;
+    rot.m[0][3] = (x * z * ic - y * s) * -inv_dist_to_plane;
+    rot.m[1][3] = (y * z * ic + x * s) * -inv_dist_to_plane;
+    rot.m[2][3] = 0.0f;
+    rot.m[3][3] = 1.0f;
+    rot.flagBits = General;
+    *this *= rot;
 }
 
 #ifndef QT_NO_QUATERNION
@@ -1249,12 +1311,8 @@ void QMatrix4x4::rotate(const QQuaternion& quaternion)
     m.m[1][3] = 0.0f;
     m.m[2][3] = 0.0f;
     m.m[3][3] = 1.0f;
-    int flags = flagBits;
+    m.flagBits = Rotation;
     *this *= m;
-    if (flags != Identity)
-        flagBits = flags | Rotation;
-    else
-        flagBits = Rotation;
 }
 
 #endif
@@ -1309,22 +1367,6 @@ void QMatrix4x4::ortho(qreal left, qreal right, qreal bottom, qreal top, qreal n
     qreal width = right - left;
     qreal invheight = top - bottom;
     qreal clip = farPlane - nearPlane;
-#ifndef QT_NO_VECTOR3D
-    if (clip == 2.0f && (nearPlane + farPlane) == 0.0f) {
-        // We can express this projection as a translate and scale
-        // which will be more efficient to modify with further
-        // transformations than producing a "General" matrix.
-        translate(QVector3D
-            (-(left + right) / width,
-             -(top + bottom) / invheight,
-             0.0f));
-        scale(QVector3D
-            (2.0f / width,
-             2.0f / invheight,
-             -1.0f));
-        return;
-    }
-#endif
     QMatrix4x4 m(1);
     m.m[0][0] = 2.0f / width;
     m.m[1][0] = 0.0f;
@@ -1342,10 +1384,10 @@ void QMatrix4x4::ortho(qreal left, qreal right, qreal bottom, qreal top, qreal n
     m.m[1][3] = 0.0f;
     m.m[2][3] = 0.0f;
     m.m[3][3] = 1.0f;
+    m.flagBits = Translation | Scale;
 
     // Apply the projection.
     *this *= m;
-    return;
 }
 
 /*!
@@ -1383,6 +1425,7 @@ void QMatrix4x4::frustum(qreal left, qreal right, qreal bottom, qreal top, qreal
     m.m[1][3] = 0.0f;
     m.m[2][3] = -1.0f;
     m.m[3][3] = 0.0f;
+    m.flagBits = General;
 
     // Apply the projection.
     *this *= m;
@@ -1426,6 +1469,7 @@ void QMatrix4x4::perspective(qreal angle, qreal aspect, qreal nearPlane, qreal f
     m.m[1][3] = 0.0f;
     m.m[2][3] = -1.0f;
     m.m[3][3] = 0.0f;
+    m.flagBits = General;
 
     // Apply the projection.
     *this *= m;
@@ -1446,7 +1490,6 @@ void QMatrix4x4::lookAt(const QVector3D& eye, const QVector3D& center, const QVe
     QVector3D upVector = QVector3D::crossProduct(side, forward);
 
     QMatrix4x4 m(1);
-
     m.m[0][0] = side.x();
     m.m[1][0] = side.y();
     m.m[2][0] = side.z();
@@ -1463,6 +1506,7 @@ void QMatrix4x4::lookAt(const QVector3D& eye, const QVector3D& center, const QVe
     m.m[1][3] = 0.0f;
     m.m[2][3] = 0.0f;
     m.m[3][3] = 1.0f;
+    m.flagBits = Rotation;
 
     *this *= m;
     translate(-eye);
@@ -1471,6 +1515,8 @@ void QMatrix4x4::lookAt(const QVector3D& eye, const QVector3D& center, const QVe
 #endif
 
 /*!
+    \deprecated
+
     Flips between right-handed and left-handed coordinate systems
     by multiplying the y and z co-ordinates by -1.  This is normally
     used to create a left-handed orthographic view without scaling
@@ -1480,17 +1526,13 @@ void QMatrix4x4::lookAt(const QVector3D& eye, const QVector3D& center, const QVe
 */
 void QMatrix4x4::flipCoordinates()
 {
-    if (flagBits == Scale || flagBits == (Scale | Translation)) {
+    // Multiplying the y and z coordinates with -1 does NOT flip between right-handed and
+    // left-handed coordinate systems, it just rotates 180 degrees around the x axis, so
+    // I'm deprecating this function.
+    if (flagBits < Rotation2D) {
+        // Translation | Scale
         m[1][1] = -m[1][1];
         m[2][2] = -m[2][2];
-    } else if (flagBits == Translation) {
-        m[1][1] = -m[1][1];
-        m[2][2] = -m[2][2];
-        flagBits |= Scale;
-    } else if (flagBits == Identity) {
-        m[1][1] = -1.0f;
-        m[2][2] = -1.0f;
-        flagBits = Scale;
     } else {
         m[1][0] = -m[1][0];
         m[1][1] = -m[1][1];
@@ -1500,8 +1542,8 @@ void QMatrix4x4::flipCoordinates()
         m[2][1] = -m[2][1];
         m[2][2] = -m[2][2];
         m[2][3] = -m[2][3];
-        flagBits = General;
     }
+    flagBits |= Scale;
 }
 
 /*!
@@ -1568,12 +1610,9 @@ QTransform QMatrix4x4::toTransform(qreal distanceToPlane) const
 {
     if (distanceToPlane == 1024.0f) {
         // Optimize the common case with constants.
-        return QTransform(m[0][0], m[0][1],
-                                m[0][3] - m[0][2] * inv_dist_to_plane,
-                          m[1][0], m[1][1],
-                                m[1][3] - m[1][2] * inv_dist_to_plane,
-                          m[3][0], m[3][1],
-                                m[3][3] - m[3][2] * inv_dist_to_plane);
+        return QTransform(m[0][0], m[0][1], m[0][3] - m[0][2] * inv_dist_to_plane,
+                          m[1][0], m[1][1], m[1][3] - m[1][2] * inv_dist_to_plane,
+                          m[3][0], m[3][1], m[3][3] - m[3][2] * inv_dist_to_plane);
     } else if (distanceToPlane != 0.0f) {
         // The following projection matrix is pre-multiplied with "matrix":
         //      | 1 0 0 0 |
@@ -1654,7 +1693,13 @@ QTransform QMatrix4x4::toTransform(qreal distanceToPlane) const
 */
 QRect QMatrix4x4::mapRect(const QRect& rect) const
 {
-    if (flagBits == (Translation | Scale) || flagBits == Scale) {
+    if (flagBits < Scale) {
+        // Translation
+        return QRect(qRound(rect.x() + m[3][0]),
+                     qRound(rect.y() + m[3][1]),
+                     rect.width(), rect.height());
+    } else if (flagBits < Rotation2D) {
+        // Translation | Scale
         qreal x = rect.x() * m[0][0] + m[3][0];
         qreal y = rect.y() * m[1][1] + m[3][1];
         qreal w = rect.width() * m[0][0];
@@ -1668,10 +1713,6 @@ QRect QMatrix4x4::mapRect(const QRect& rect) const
             y -= h;
         }
         return QRect(qRound(x), qRound(y), qRound(w), qRound(h));
-    } else if (flagBits == Translation) {
-        return QRect(qRound(rect.x() + m[3][0]),
-                     qRound(rect.y() + m[3][1]),
-                     rect.width(), rect.height());
     }
 
     QPoint tl = map(rect.topLeft());
@@ -1698,7 +1739,11 @@ QRect QMatrix4x4::mapRect(const QRect& rect) const
 */
 QRectF QMatrix4x4::mapRect(const QRectF& rect) const
 {
-    if (flagBits == (Translation | Scale) || flagBits == Scale) {
+    if (flagBits < Scale) {
+        // Translation
+        return rect.translated(m[3][0], m[3][1]);
+    } else if (flagBits < Rotation2D) {
+        // Translation | Scale
         qreal x = rect.x() * m[0][0] + m[3][0];
         qreal y = rect.y() * m[1][1] + m[3][1];
         qreal w = rect.width() * m[0][0];
@@ -1712,8 +1757,6 @@ QRectF QMatrix4x4::mapRect(const QRectF& rect) const
             y -= h;
         }
         return QRectF(x, y, w, h);
-    } else if (flagBits == Translation) {
-        return rect.translated(m[3][0], m[3][1]);
     }
 
     QPointF tl = map(rect.topLeft()); QPointF tr = map(rect.topRight());
@@ -1780,6 +1823,8 @@ QMatrix4x4 QMatrix4x4::orthonormalInverse() const
     result.m[3][2] = -(result.m[0][2] * m[3][0] + result.m[1][2] * m[3][1] + result.m[2][2] * m[3][2]);
     result.m[3][3] = 1.0f;
 
+    result.flagBits = flagBits;
+
     return result;
 }
 
@@ -1805,40 +1850,50 @@ QMatrix4x4 QMatrix4x4::orthonormalInverse() const
 */
 void QMatrix4x4::optimize()
 {
-    // If the last element is not 1, then it can never be special.
-    if (m[3][3] != 1.0f) {
-        flagBits = General;
+    // If the last row is not (0, 0, 0, 1), the matrix is not a special type.
+    flagBits = General;
+    if (m[0][3] != 0 || m[1][3] != 0 || m[2][3] != 0 || m[3][3] != 1)
         return;
-    }
 
-    // If the upper three elements m12, m13, and m21 are not all zero,
-    // or the lower elements below the diagonal are not all zero, then
-    // the matrix can never be special.
-    if (m[1][0] != 0.0f || m[2][0] != 0.0f || m[2][1] != 0.0f) {
-        flagBits = General;
-        return;
-    }
-    if (m[0][1] != 0.0f || m[0][2] != 0.0f || m[0][3] != 0.0f ||
-        m[1][2] != 0.0f || m[1][3] != 0.0f || m[2][3] != 0.0f) {
-        flagBits = General;
-        return;
-    }
+    flagBits &= ~Perspective;
 
-    // Determine what we have in the remaining regions of the matrix.
-    bool identityAlongDiagonal
-        = (m[0][0] == 1.0f && m[1][1] == 1.0f && m[2][2] == 1.0f);
-    bool translationPresent
-        = (m[3][0] != 0.0f || m[3][1] != 0.0f || m[3][2] != 0.0f);
+    // If the last column is (0, 0, 0, 1), then there is no translation.
+    if (m[3][0] == 0 && m[3][1] == 0 && m[3][2] == 0)
+        flagBits &= ~Translation;
 
-    // Now determine the special matrix type.
-    if (translationPresent && identityAlongDiagonal)
-        flagBits = Translation;
-    else if (translationPresent)
-        flagBits = (Translation | Scale);
-    else if (identityAlongDiagonal)
-        flagBits = Identity;
-    else
-        flagBits = Scale;
+    // If the two first elements of row 3 and column 3 are 0, then any rotation must be about Z.
+    if (!m[0][2] && !m[1][2] && !m[2][0] && !m[2][1]) {
+        flagBits &= ~Rotation;
+        // If the six non-diagonal elements in the top left 3x3 matrix are 0, there is no rotation.
+        if (!m[0][1] && !m[1][0]) {
+            flagBits &= ~Rotation2D;
+            // Check for identity.
+            if (m[0][0] == 1 && m[1][1] == 1 && m[2][2] == 1)
+                flagBits &= ~Scale;
+        } else {
+            // If the columns are orthonormal and form a right-handed system, then there is no scale.
+            qreal det = matrixDet2(m, 0, 1, 0, 1);
+            qreal lenX = m[0][0] * m[0][0] + m[0][1] * m[0][1];
+            qreal lenY = m[1][0] * m[1][0] + m[1][1] * m[1][1];
+            qreal lenZ = m[2][2];
+            if (qFuzzyCompare(det, qreal(1)) && qFuzzyCompare(lenX, qreal(1))
+                    && qFuzzyCompare(lenY, qreal(1)) && qFuzzyCompare(lenZ, qreal(1)))
+            {
+                flagBits &= ~Scale;
+            }
+        }
+    } else {
+        // If the columns are orthonormal and form a right-handed system, then there is no scale.
+        qreal det = matrixDet3(m, 0, 1, 2, 0, 1, 2);
+        qreal lenX = m[0][0] * m[0][0] + m[0][1] * m[0][1] + m[0][2] * m[0][2];
+        qreal lenY = m[1][0] * m[1][0] + m[1][1] * m[1][1] + m[1][2] * m[1][2];
+        qreal lenZ = m[2][0] * m[2][0] + m[2][1] * m[2][1] + m[2][2] * m[2][2];
+        if (qFuzzyCompare(det, qreal(1)) && qFuzzyCompare(lenX, qreal(1))
+                && qFuzzyCompare(lenY, qreal(1)) && qFuzzyCompare(lenZ, qreal(1)))
+        {
+            flagBits &= ~Scale;
+        }
+    }
 }
 
 /*!
@@ -1855,18 +1910,24 @@ QDebug operator<<(QDebug dbg, const QMatrix4x4 &m)
 {
     // Create a string that represents the matrix type.
     QByteArray bits;
-    if ((m.flagBits & QMatrix4x4::Identity) != 0)
-        bits += "Identity,";
-    if ((m.flagBits & QMatrix4x4::General) != 0)
-        bits += "General,";
-    if ((m.flagBits & QMatrix4x4::Translation) != 0)
-        bits += "Translation,";
-    if ((m.flagBits & QMatrix4x4::Scale) != 0)
-        bits += "Scale,";
-    if ((m.flagBits & QMatrix4x4::Rotation) != 0)
-        bits += "Rotation,";
-    if (bits.size() > 0)
-        bits = bits.left(bits.size() - 1);
+    if (m.flagBits == QMatrix4x4::Identity) {
+        bits = "Identity";
+    } else if (m.flagBits == QMatrix4x4::General) {
+        bits = "General";
+    } else {
+        if ((m.flagBits & QMatrix4x4::Translation) != 0)
+            bits += "Translation,";
+        if ((m.flagBits & QMatrix4x4::Scale) != 0)
+            bits += "Scale,";
+        if ((m.flagBits & QMatrix4x4::Rotation2D) != 0)
+            bits += "Rotation2D,";
+        if ((m.flagBits & QMatrix4x4::Rotation) != 0)
+            bits += "Rotation,";
+        if ((m.flagBits & QMatrix4x4::Perspective) != 0)
+            bits += "Perspective,";
+        if (bits.size() > 0)
+            bits = bits.left(bits.size() - 1);
+    }
 
     // Output in row-major order because it is more human-readable.
     dbg.nospace() << "QMatrix4x4(type:" << bits.constData() << endl
diff --git a/src/gui/math3d/qmatrix4x4.h b/src/gui/math3d/qmatrix4x4.h
index bfbe4b97934..2c98dd03e30 100644
--- a/src/gui/math3d/qmatrix4x4.h
+++ b/src/gui/math3d/qmatrix4x4.h
@@ -80,11 +80,13 @@ public:
     inline const qreal& operator()(int row, int column) const;
     inline qreal& operator()(int row, int column);
 
+#ifndef QT_NO_VECTOR4D
     inline QVector4D column(int index) const;
     inline void setColumn(int index, const QVector4D& value);
 
     inline QVector4D row(int index) const;
     inline void setRow(int index, const QVector4D& value);
+#endif
 
     inline bool isIdentity() const;
     inline void setToIdentity();
@@ -188,16 +190,19 @@ private:
     qreal m[4][4];          // Column-major order to match OpenGL.
     int flagBits;           // Flag bits from the enum below.
 
+    // When matrices are multiplied, the flag bits are or-ed together.
     enum {
-        Identity        = 0x0001,   // Identity matrix
-        General         = 0x0002,   // General matrix, unknown contents
-        Translation     = 0x0004,   // Contains a simple translation
-        Scale           = 0x0008,   // Contains a simple scale
-        Rotation        = 0x0010    // Contains a simple rotation
+        Identity        = 0x0000, // Identity matrix
+        Translation     = 0x0001, // Contains a translation
+        Scale           = 0x0002, // Contains a scale
+        Rotation2D      = 0x0004, // Contains a rotation about the Z axis
+        Rotation        = 0x0008, // Contains an arbitrary rotation
+        Perspective     = 0x0010, // Last row is different from (0, 0, 0, 1)
+        General         = 0x001f  // General matrix, unknown contents
     };
 
     // Construct without initializing identity matrix.
-    QMatrix4x4(int) { flagBits = General; }
+    QMatrix4x4(int) { }
 
     QMatrix4x4 orthonormalInverse() const;
 
@@ -270,6 +275,7 @@ inline qreal& QMatrix4x4::operator()(int aRow, int aColumn)
     return m[aColumn][aRow];
 }
 
+#ifndef QT_NO_VECTOR4D
 inline QVector4D QMatrix4x4::column(int index) const
 {
     Q_ASSERT(index >= 0 && index < 4);
@@ -301,6 +307,7 @@ inline void QMatrix4x4::setRow(int index, const QVector4D& value)
     m[3][index] = value.w();
     flagBits = General;
 }
+#endif
 
 Q_GUI_EXPORT QMatrix4x4 operator/(const QMatrix4x4& matrix, qreal divisor);
 
@@ -409,15 +416,100 @@ inline QMatrix4x4& QMatrix4x4::operator-=(const QMatrix4x4& other)
 
 inline QMatrix4x4& QMatrix4x4::operator*=(const QMatrix4x4& other)
 {
-    if (flagBits == Identity) {
-        *this = other;
-        return *this;
-    } else if (other.flagBits == Identity) {
-        return *this;
-    } else {
-        *this = *this * other;
+    flagBits |= other.flagBits;
+
+    if (flagBits < Rotation2D) {
+        m[3][0] += m[0][0] * other.m[3][0];
+        m[3][1] += m[1][1] * other.m[3][1];
+        m[3][2] += m[2][2] * other.m[3][2];
+
+        m[0][0] *= other.m[0][0];
+        m[1][1] *= other.m[1][1];
+        m[2][2] *= other.m[2][2];
         return *this;
     }
+
+    qreal m0, m1, m2;
+    m0 = m[0][0] * other.m[0][0]
+            + m[1][0] * other.m[0][1]
+            + m[2][0] * other.m[0][2]
+            + m[3][0] * other.m[0][3];
+    m1 = m[0][0] * other.m[1][0]
+            + m[1][0] * other.m[1][1]
+            + m[2][0] * other.m[1][2]
+            + m[3][0] * other.m[1][3];
+    m2 = m[0][0] * other.m[2][0]
+            + m[1][0] * other.m[2][1]
+            + m[2][0] * other.m[2][2]
+            + m[3][0] * other.m[2][3];
+    m[3][0] = m[0][0] * other.m[3][0]
+            + m[1][0] * other.m[3][1]
+            + m[2][0] * other.m[3][2]
+            + m[3][0] * other.m[3][3];
+    m[0][0] = m0;
+    m[1][0] = m1;
+    m[2][0] = m2;
+
+    m0 = m[0][1] * other.m[0][0]
+            + m[1][1] * other.m[0][1]
+            + m[2][1] * other.m[0][2]
+            + m[3][1] * other.m[0][3];
+    m1 = m[0][1] * other.m[1][0]
+            + m[1][1] * other.m[1][1]
+            + m[2][1] * other.m[1][2]
+            + m[3][1] * other.m[1][3];
+    m2 = m[0][1] * other.m[2][0]
+            + m[1][1] * other.m[2][1]
+            + m[2][1] * other.m[2][2]
+            + m[3][1] * other.m[2][3];
+    m[3][1] = m[0][1] * other.m[3][0]
+            + m[1][1] * other.m[3][1]
+            + m[2][1] * other.m[3][2]
+            + m[3][1] * other.m[3][3];
+    m[0][1] = m0;
+    m[1][1] = m1;
+    m[2][1] = m2;
+
+    m0 = m[0][2] * other.m[0][0]
+            + m[1][2] * other.m[0][1]
+            + m[2][2] * other.m[0][2]
+            + m[3][2] * other.m[0][3];
+    m1 = m[0][2] * other.m[1][0]
+            + m[1][2] * other.m[1][1]
+            + m[2][2] * other.m[1][2]
+            + m[3][2] * other.m[1][3];
+    m2 = m[0][2] * other.m[2][0]
+            + m[1][2] * other.m[2][1]
+            + m[2][2] * other.m[2][2]
+            + m[3][2] * other.m[2][3];
+    m[3][2] = m[0][2] * other.m[3][0]
+            + m[1][2] * other.m[3][1]
+            + m[2][2] * other.m[3][2]
+            + m[3][2] * other.m[3][3];
+    m[0][2] = m0;
+    m[1][2] = m1;
+    m[2][2] = m2;
+
+    m0 = m[0][3] * other.m[0][0]
+            + m[1][3] * other.m[0][1]
+            + m[2][3] * other.m[0][2]
+            + m[3][3] * other.m[0][3];
+    m1 = m[0][3] * other.m[1][0]
+            + m[1][3] * other.m[1][1]
+            + m[2][3] * other.m[1][2]
+            + m[3][3] * other.m[1][3];
+    m2 = m[0][3] * other.m[2][0]
+            + m[1][3] * other.m[2][1]
+            + m[2][3] * other.m[2][2]
+            + m[3][3] * other.m[2][3];
+    m[3][3] = m[0][3] * other.m[3][0]
+            + m[1][3] * other.m[3][1]
+            + m[2][3] * other.m[3][2]
+            + m[3][3] * other.m[3][3];
+    m[0][3] = m0;
+    m[1][3] = m1;
+    m[2][3] = m2;
+    return *this;
 }
 
 inline QMatrix4x4& QMatrix4x4::operator*=(qreal factor)
@@ -501,6 +593,7 @@ inline QMatrix4x4 operator+(const QMatrix4x4& m1, const QMatrix4x4& m2)
     m.m[3][1] = m1.m[3][1] + m2.m[3][1];
     m.m[3][2] = m1.m[3][2] + m2.m[3][2];
     m.m[3][3] = m1.m[3][3] + m2.m[3][3];
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
@@ -523,81 +616,95 @@ inline QMatrix4x4 operator-(const QMatrix4x4& m1, const QMatrix4x4& m2)
     m.m[3][1] = m1.m[3][1] - m2.m[3][1];
     m.m[3][2] = m1.m[3][2] - m2.m[3][2];
     m.m[3][3] = m1.m[3][3] - m2.m[3][3];
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
 inline QMatrix4x4 operator*(const QMatrix4x4& m1, const QMatrix4x4& m2)
 {
-    if (m1.flagBits == QMatrix4x4::Identity)
-        return m2;
-    else if (m2.flagBits == QMatrix4x4::Identity)
-        return m1;
+    int flagBits = m1.flagBits | m2.flagBits;
+    if (flagBits < QMatrix4x4::Rotation2D) {
+        QMatrix4x4 m = m1;
+        m.m[3][0] += m.m[0][0] * m2.m[3][0];
+        m.m[3][1] += m.m[1][1] * m2.m[3][1];
+        m.m[3][2] += m.m[2][2] * m2.m[3][2];
+
+        m.m[0][0] *= m2.m[0][0];
+        m.m[1][1] *= m2.m[1][1];
+        m.m[2][2] *= m2.m[2][2];
+        m.flagBits = flagBits;
+        return m;
+    }
 
     QMatrix4x4 m(1);
-    m.m[0][0] = m1.m[0][0] * m2.m[0][0] +
-                m1.m[1][0] * m2.m[0][1] +
-                m1.m[2][0] * m2.m[0][2] +
-                m1.m[3][0] * m2.m[0][3];
-    m.m[0][1] = m1.m[0][1] * m2.m[0][0] +
-                m1.m[1][1] * m2.m[0][1] +
-                m1.m[2][1] * m2.m[0][2] +
-                m1.m[3][1] * m2.m[0][3];
-    m.m[0][2] = m1.m[0][2] * m2.m[0][0] +
-                m1.m[1][2] * m2.m[0][1] +
-                m1.m[2][2] * m2.m[0][2] +
-                m1.m[3][2] * m2.m[0][3];
-    m.m[0][3] = m1.m[0][3] * m2.m[0][0] +
-                m1.m[1][3] * m2.m[0][1] +
-                m1.m[2][3] * m2.m[0][2] +
-                m1.m[3][3] * m2.m[0][3];
-    m.m[1][0] = m1.m[0][0] * m2.m[1][0] +
-                m1.m[1][0] * m2.m[1][1] +
-                m1.m[2][0] * m2.m[1][2] +
-                m1.m[3][0] * m2.m[1][3];
-    m.m[1][1] = m1.m[0][1] * m2.m[1][0] +
-                m1.m[1][1] * m2.m[1][1] +
-                m1.m[2][1] * m2.m[1][2] +
-                m1.m[3][1] * m2.m[1][3];
-    m.m[1][2] = m1.m[0][2] * m2.m[1][0] +
-                m1.m[1][2] * m2.m[1][1] +
-                m1.m[2][2] * m2.m[1][2] +
-                m1.m[3][2] * m2.m[1][3];
-    m.m[1][3] = m1.m[0][3] * m2.m[1][0] +
-                m1.m[1][3] * m2.m[1][1] +
-                m1.m[2][3] * m2.m[1][2] +
-                m1.m[3][3] * m2.m[1][3];
-    m.m[2][0] = m1.m[0][0] * m2.m[2][0] +
-                m1.m[1][0] * m2.m[2][1] +
-                m1.m[2][0] * m2.m[2][2] +
-                m1.m[3][0] * m2.m[2][3];
-    m.m[2][1] = m1.m[0][1] * m2.m[2][0] +
-                m1.m[1][1] * m2.m[2][1] +
-                m1.m[2][1] * m2.m[2][2] +
-                m1.m[3][1] * m2.m[2][3];
-    m.m[2][2] = m1.m[0][2] * m2.m[2][0] +
-                m1.m[1][2] * m2.m[2][1] +
-                m1.m[2][2] * m2.m[2][2] +
-                m1.m[3][2] * m2.m[2][3];
-    m.m[2][3] = m1.m[0][3] * m2.m[2][0] +
-                m1.m[1][3] * m2.m[2][1] +
-                m1.m[2][3] * m2.m[2][2] +
-                m1.m[3][3] * m2.m[2][3];
-    m.m[3][0] = m1.m[0][0] * m2.m[3][0] +
-                m1.m[1][0] * m2.m[3][1] +
-                m1.m[2][0] * m2.m[3][2] +
-                m1.m[3][0] * m2.m[3][3];
-    m.m[3][1] = m1.m[0][1] * m2.m[3][0] +
-                m1.m[1][1] * m2.m[3][1] +
-                m1.m[2][1] * m2.m[3][2] +
-                m1.m[3][1] * m2.m[3][3];
-    m.m[3][2] = m1.m[0][2] * m2.m[3][0] +
-                m1.m[1][2] * m2.m[3][1] +
-                m1.m[2][2] * m2.m[3][2] +
-                m1.m[3][2] * m2.m[3][3];
-    m.m[3][3] = m1.m[0][3] * m2.m[3][0] +
-                m1.m[1][3] * m2.m[3][1] +
-                m1.m[2][3] * m2.m[3][2] +
-                m1.m[3][3] * m2.m[3][3];
+    m.m[0][0] = m1.m[0][0] * m2.m[0][0]
+              + m1.m[1][0] * m2.m[0][1]
+              + m1.m[2][0] * m2.m[0][2]
+              + m1.m[3][0] * m2.m[0][3];
+    m.m[0][1] = m1.m[0][1] * m2.m[0][0]
+              + m1.m[1][1] * m2.m[0][1]
+              + m1.m[2][1] * m2.m[0][2]
+              + m1.m[3][1] * m2.m[0][3];
+    m.m[0][2] = m1.m[0][2] * m2.m[0][0]
+              + m1.m[1][2] * m2.m[0][1]
+              + m1.m[2][2] * m2.m[0][2]
+              + m1.m[3][2] * m2.m[0][3];
+    m.m[0][3] = m1.m[0][3] * m2.m[0][0]
+              + m1.m[1][3] * m2.m[0][1]
+              + m1.m[2][3] * m2.m[0][2]
+              + m1.m[3][3] * m2.m[0][3];
+
+    m.m[1][0] = m1.m[0][0] * m2.m[1][0]
+              + m1.m[1][0] * m2.m[1][1]
+              + m1.m[2][0] * m2.m[1][2]
+              + m1.m[3][0] * m2.m[1][3];
+    m.m[1][1] = m1.m[0][1] * m2.m[1][0]
+              + m1.m[1][1] * m2.m[1][1]
+              + m1.m[2][1] * m2.m[1][2]
+              + m1.m[3][1] * m2.m[1][3];
+    m.m[1][2] = m1.m[0][2] * m2.m[1][0]
+              + m1.m[1][2] * m2.m[1][1]
+              + m1.m[2][2] * m2.m[1][2]
+              + m1.m[3][2] * m2.m[1][3];
+    m.m[1][3] = m1.m[0][3] * m2.m[1][0]
+              + m1.m[1][3] * m2.m[1][1]
+              + m1.m[2][3] * m2.m[1][2]
+              + m1.m[3][3] * m2.m[1][3];
+
+    m.m[2][0] = m1.m[0][0] * m2.m[2][0]
+              + m1.m[1][0] * m2.m[2][1]
+              + m1.m[2][0] * m2.m[2][2]
+              + m1.m[3][0] * m2.m[2][3];
+    m.m[2][1] = m1.m[0][1] * m2.m[2][0]
+              + m1.m[1][1] * m2.m[2][1]
+              + m1.m[2][1] * m2.m[2][2]
+              + m1.m[3][1] * m2.m[2][3];
+    m.m[2][2] = m1.m[0][2] * m2.m[2][0]
+              + m1.m[1][2] * m2.m[2][1]
+              + m1.m[2][2] * m2.m[2][2]
+              + m1.m[3][2] * m2.m[2][3];
+    m.m[2][3] = m1.m[0][3] * m2.m[2][0]
+              + m1.m[1][3] * m2.m[2][1]
+              + m1.m[2][3] * m2.m[2][2]
+              + m1.m[3][3] * m2.m[2][3];
+
+    m.m[3][0] = m1.m[0][0] * m2.m[3][0]
+              + m1.m[1][0] * m2.m[3][1]
+              + m1.m[2][0] * m2.m[3][2]
+              + m1.m[3][0] * m2.m[3][3];
+    m.m[3][1] = m1.m[0][1] * m2.m[3][0]
+              + m1.m[1][1] * m2.m[3][1]
+              + m1.m[2][1] * m2.m[3][2]
+              + m1.m[3][1] * m2.m[3][3];
+    m.m[3][2] = m1.m[0][2] * m2.m[3][0]
+              + m1.m[1][2] * m2.m[3][1]
+              + m1.m[2][2] * m2.m[3][2]
+              + m1.m[3][2] * m2.m[3][3];
+    m.m[3][3] = m1.m[0][3] * m2.m[3][0]
+              + m1.m[1][3] * m2.m[3][1]
+              + m1.m[2][3] * m2.m[3][2]
+              + m1.m[3][3] * m2.m[3][3];
+    m.flagBits = flagBits;
     return m;
 }
 
@@ -633,19 +740,16 @@ inline QVector3D operator*(const QMatrix4x4& matrix, const QVector3D& vector)
     qreal x, y, z, w;
     if (matrix.flagBits == QMatrix4x4::Identity) {
         return vector;
-    } else if (matrix.flagBits == QMatrix4x4::Translation) {
-        return QVector3D(vector.x() + matrix.m[3][0],
-                         vector.y() + matrix.m[3][1],
-                         vector.z() + matrix.m[3][2]);
-    } else if (matrix.flagBits ==
-                    (QMatrix4x4::Translation | QMatrix4x4::Scale)) {
+    } else if (matrix.flagBits < QMatrix4x4::Rotation2D) {
+        // Translation | Scale
         return QVector3D(vector.x() * matrix.m[0][0] + matrix.m[3][0],
                          vector.y() * matrix.m[1][1] + matrix.m[3][1],
                          vector.z() * matrix.m[2][2] + matrix.m[3][2]);
-    } else if (matrix.flagBits == QMatrix4x4::Scale) {
-        return QVector3D(vector.x() * matrix.m[0][0],
-                         vector.y() * matrix.m[1][1],
-                         vector.z() * matrix.m[2][2]);
+    } else if (matrix.flagBits < QMatrix4x4::Rotation) {
+        // Translation | Scale | Rotation2D
+        return QVector3D(vector.x() * matrix.m[0][0] + vector.y() * matrix.m[1][0] + matrix.m[3][0],
+                         vector.x() * matrix.m[0][1] + vector.y() * matrix.m[1][1] + matrix.m[3][1],
+                         vector.z() * matrix.m[2][2] + matrix.m[3][2]);
     } else {
         x = vector.x() * matrix.m[0][0] +
             vector.y() * matrix.m[1][0] +
@@ -771,16 +875,13 @@ inline QPoint operator*(const QMatrix4x4& matrix, const QPoint& point)
     yin = point.y();
     if (matrix.flagBits == QMatrix4x4::Identity) {
         return point;
-    } else if (matrix.flagBits == QMatrix4x4::Translation) {
-        return QPoint(qRound(xin + matrix.m[3][0]),
-                      qRound(yin + matrix.m[3][1]));
-    } else if (matrix.flagBits ==
-                    (QMatrix4x4::Translation | QMatrix4x4::Scale)) {
+    } else if (matrix.flagBits < QMatrix4x4::Rotation2D) {
+        // Translation | Scale
         return QPoint(qRound(xin * matrix.m[0][0] + matrix.m[3][0]),
                       qRound(yin * matrix.m[1][1] + matrix.m[3][1]));
-    } else if (matrix.flagBits == QMatrix4x4::Scale) {
-        return QPoint(qRound(xin * matrix.m[0][0]),
-                      qRound(yin * matrix.m[1][1]));
+    } else if (matrix.flagBits < QMatrix4x4::Perspective) {
+        return QPoint(qRound(xin * matrix.m[0][0] + yin * matrix.m[1][0] + matrix.m[3][0]),
+                      qRound(xin * matrix.m[0][1] + yin * matrix.m[1][1] + matrix.m[3][1]));
     } else {
         x = xin * matrix.m[0][0] +
             yin * matrix.m[1][0] +
@@ -806,16 +907,13 @@ inline QPointF operator*(const QMatrix4x4& matrix, const QPointF& point)
     yin = point.y();
     if (matrix.flagBits == QMatrix4x4::Identity) {
         return point;
-    } else if (matrix.flagBits == QMatrix4x4::Translation) {
-        return QPointF(xin + matrix.m[3][0],
-                       yin + matrix.m[3][1]);
-    } else if (matrix.flagBits ==
-                    (QMatrix4x4::Translation | QMatrix4x4::Scale)) {
+    } else if (matrix.flagBits < QMatrix4x4::Rotation2D) {
+        // Translation | Scale
         return QPointF(xin * matrix.m[0][0] + matrix.m[3][0],
                        yin * matrix.m[1][1] + matrix.m[3][1]);
-    } else if (matrix.flagBits == QMatrix4x4::Scale) {
-        return QPointF(xin * matrix.m[0][0],
-                       yin * matrix.m[1][1]);
+    } else if (matrix.flagBits < QMatrix4x4::Perspective) {
+        return QPointF(xin * matrix.m[0][0] + yin * matrix.m[1][0] + matrix.m[3][0],
+                       xin * matrix.m[0][1] + yin * matrix.m[1][1] + matrix.m[3][1]);
     } else {
         x = xin * matrix.m[0][0] +
             yin * matrix.m[1][0] +
@@ -853,6 +951,7 @@ inline QMatrix4x4 operator-(const QMatrix4x4& matrix)
     m.m[3][1] = -matrix.m[3][1];
     m.m[3][2] = -matrix.m[3][2];
     m.m[3][3] = -matrix.m[3][3];
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
@@ -875,6 +974,7 @@ inline QMatrix4x4 operator*(qreal factor, const QMatrix4x4& matrix)
     m.m[3][1] = matrix.m[3][1] * factor;
     m.m[3][2] = matrix.m[3][2] * factor;
     m.m[3][3] = matrix.m[3][3] * factor;
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
@@ -897,6 +997,7 @@ inline QMatrix4x4 operator*(const QMatrix4x4& matrix, qreal factor)
     m.m[3][1] = matrix.m[3][1] * factor;
     m.m[3][2] = matrix.m[3][2] * factor;
     m.m[3][3] = matrix.m[3][3] * factor;
+    m.flagBits = QMatrix4x4::General;
     return m;
 }
 
@@ -939,9 +1040,11 @@ inline QVector3D QMatrix4x4::map(const QVector3D& point) const
 
 inline QVector3D QMatrix4x4::mapVector(const QVector3D& vector) const
 {
-    if (flagBits == Identity || flagBits == Translation) {
+    if (flagBits < Scale) {
+        // Translation
         return vector;
-    } else if (flagBits == Scale || flagBits == (Translation | Scale)) {
+    } else if (flagBits < Rotation2D) {
+        // Translation | Scale
         return QVector3D(vector.x() * m[0][0],
                          vector.y() * m[1][1],
                          vector.z() * m[2][2]);
diff --git a/src/modules/qt_v8.pri b/src/modules/qt_v8.pri
new file mode 100644
index 00000000000..89d6c263e86
--- /dev/null
+++ b/src/modules/qt_v8.pri
@@ -0,0 +1,16 @@
+QT.v8.VERSION = 5.0.0
+QT.v8.MAJOR_VERSION = 5
+QT.v8.MINOR_VERSION = 0
+QT.v8.PATCH_VERSION = 0
+
+QT.v8.name = QtV8
+QT.v8.bins = $$QT_MODULE_BIN_BASE
+QT.v8.includes = $$QT_MODULE_INCLUDE_BASE/QtV8
+QT.v8.private_includes = $$QT_MODULE_INCLUDE_BASE/QtV8/$$QT.v8.VERSION
+QT.v8.sources = $$QT_MODULE_BASE/src/v8
+QT.v8.libs = $$QT_MODULE_LIB_BASE
+QT.v8.plugins = $$QT_MODULE_PLUGIN_BASE
+QT.v8.imports = $$QT_MODULE_IMPORT_BASE
+QT.v8.depends =
+QT.v8.DEFINES =
+!contains(QT_CONFIG, static): QT.v8.DEFINES += V8_SHARED USING_V8_SHARED
diff --git a/src/src.pro b/src/src.pro
index 1e072fbec75..a531355ae91 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -13,7 +13,9 @@ SRC_SUBDIRS += src_corelib
 SRC_SUBDIRS += src_network src_sql src_gui src_xml src_uitools src_widgets src_printsupport src_testlib src_platformsupport
 nacl: SRC_SUBDIRS -= src_network src_testlib
 !symbian:contains(QT_CONFIG, dbus):SRC_SUBDIRS += src_dbus
+
 contains(QT_CONFIG, no-gui): SRC_SUBDIRS -= src_gui
+!contains(QT_CONFIG, no-v8): SRC_SUBDIRS += src_v8
 
 contains(QT_CONFIG, opengl)|contains(QT_CONFIG, opengles1)|contains(QT_CONFIG, opengles2): SRC_SUBDIRS += src_opengl
 SRC_SUBDIRS += src_plugins
@@ -30,6 +32,8 @@ src_winmain.subdir = $$QT_SOURCE_TREE/src/winmain
 src_winmain.target = sub-winmain
 src_corelib.subdir = $$QT_SOURCE_TREE/src/corelib
 src_corelib.target = sub-corelib
+src_v8.subdir = $$QT_SOURCE_TREE/src/v8
+src_v8.target = sub-v8
 src_xml.subdir = $$QT_SOURCE_TREE/src/xml
 src_xml.target = sub-xml
 src_uitools.subdir = $$QT_SOURCE_TREE/src/uitools
diff --git a/src/v8/0001-Add-hashing-and-comparison-methods-to-v8-String.patch b/src/v8/0001-Add-hashing-and-comparison-methods-to-v8-String.patch
new file mode 100644
index 00000000000..54a35fda9fe
--- /dev/null
+++ b/src/v8/0001-Add-hashing-and-comparison-methods-to-v8-String.patch
@@ -0,0 +1,343 @@
+From e13ce09287a56c920d5ffdc5d4662d49f1838f16 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 23 May 2011 15:47:20 +1000
+Subject: [PATCH 01/13] Add hashing and comparison methods to v8::String
+
+This allows us to more rapidly search for a v8::String inside
+a hash of QStrings.
+---
+ include/v8.h      |   44 ++++++++++++++++++++++++++++++
+ src/api.cc        |   43 +++++++++++++++++++++++++++++
+ src/heap-inl.h    |    2 +
+ src/heap.cc       |    3 ++
+ src/objects-inl.h |    1 +
+ src/objects.cc    |   77 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
+ src/objects.h     |   15 +++++++++-
+ 7 files changed, 182 insertions(+), 3 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index d15d024..bbd29e9 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -994,6 +994,48 @@ class String : public Primitive {
+   V8EXPORT int Utf8Length() const;
+
+   /**
++   * Returns the hash of this string.
++   */
++  V8EXPORT uint32_t Hash() const;
++
++  struct CompleteHashData {
++    CompleteHashData() : length(0), hash(0), symbol_id(0) {}
++    int length;
++    uint32_t hash;
++    uint32_t symbol_id;
++  };
++
++  /**
++   * Returns the "complete" hash of the string.  This is
++   * all the information about the string needed to implement
++   * a very efficient hash keyed on the string.
++   *
++   * The members of CompleteHashData are:
++   *    length: The length of the string.  Equivalent to Length()
++   *    hash: The hash of the string.  Equivalent to Hash()
++   *    symbol_id: If the string is a sequential symbol, the symbol
++   *        id, otherwise 0.  If the symbol ids of two strings are
++   *        the same (and non-zero) the two strings are identical.
++   *        If the symbol ids are different the strings may still be
++   *        identical, but an Equals() check must be performed.
++   */
++  V8EXPORT CompleteHashData CompleteHash() const;
++
++  /**
++   * Compute a hash value for the passed UTF16 string
++   * data.
++   */
++  V8EXPORT static uint32_t ComputeHash(uint16_t *string, int length);
++  V8EXPORT static uint32_t ComputeHash(char *string, int length);
++
++  /**
++   * Returns true if this string is equal to the external
++   * string data provided.
++   */
++  V8EXPORT bool Equals(uint16_t *string, int length);
++  V8EXPORT bool Equals(char *string, int length);
++
++  /**
+    * Write the contents of the string to an external buffer.
+    * If no arguments are given, expects the buffer to be large
+    * enough to hold the entire string and NULL terminator. Copies
+@@ -1023,6 +1065,8 @@ class String : public Primitive {
+     HINT_MANY_WRITES_EXPECTED = 1
+   };
+
++  V8EXPORT uint16_t GetCharacter(int index);
++
+   V8EXPORT int Write(uint16_t* buffer,
+                      int start = 0,
+                      int length = -1,
+diff --git a/src/api.cc b/src/api.cc
+index a2373cd..381935b 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -3284,6 +3284,49 @@ int String::Utf8Length() const {
+   return str->Utf8Length();
+ }
+
++uint32_t String::Hash() const {
++  i::Handle<i::String> str = Utils::OpenHandle(this);
++  if (IsDeadCheck(str->GetIsolate(), "v8::String::Hash()")) return 0;
++  return str->Hash();
++}
++
++String::CompleteHashData String::CompleteHash() const {
++  i::Handle<i::String> str = Utils::OpenHandle(this);
++  if (IsDeadCheck(str->GetIsolate(), "v8::String::CompleteHash()")) return CompleteHashData();
++  CompleteHashData result;
++  result.length = str->length();
++  result.hash = str->Hash();
++  if (str->IsSeqString())
++      result.symbol_id = i::SeqString::cast(*str)->symbol_id();
++  return result;
++}
++
++uint32_t String::ComputeHash(uint16_t *string, int length) {
++  return i::HashSequentialString<i::uc16>(string, length) >> i::String::kHashShift;
++}
++
++uint32_t String::ComputeHash(char *string, int length) {
++  return i::HashSequentialString<char>(string, length) >> i::String::kHashShift;
++}
++
++uint16_t String::GetCharacter(int index)
++{
++  i::Handle<i::String> str = Utils::OpenHandle(this);
++  return str->Get(index);
++}
++
++bool String::Equals(uint16_t *string, int length) {
++  i::Handle<i::String> str = Utils::OpenHandle(this);
++  if (IsDeadCheck(str->GetIsolate(), "v8::String::Equals()")) return 0;
++  return str->SlowEqualsExternal(string, length);
++}
++
++bool String::Equals(char *string, int length)
++{
++  i::Handle<i::String> str = Utils::OpenHandle(this);
++  if (IsDeadCheck(str->GetIsolate(), "v8::String::Equals()")) return 0;
++  return str->SlowEqualsExternal(string, length);
++}
+
+ int String::WriteUtf8(char* buffer,
+                       int capacity,
+diff --git a/src/heap-inl.h b/src/heap-inl.h
+index 99737ed..f4fce7b 100644
+--- a/src/heap-inl.h
++++ b/src/heap-inl.h
+@@ -93,6 +93,7 @@ MaybeObject* Heap::AllocateAsciiSymbol(Vector<const char> str,
+   String* answer = String::cast(result);
+   answer->set_length(str.length());
+   answer->set_hash_field(hash_field);
++  SeqString::cast(answer)->set_symbol_id(0);
+
+   ASSERT_EQ(size, answer->Size());
+
+@@ -126,6 +127,7 @@ MaybeObject* Heap::AllocateTwoByteSymbol(Vector<const uc16> str,
+   String* answer = String::cast(result);
+   answer->set_length(str.length());
+   answer->set_hash_field(hash_field);
++  SeqString::cast(answer)->set_symbol_id(0);
+
+   ASSERT_EQ(size, answer->Size());
+
+diff --git a/src/heap.cc b/src/heap.cc
+index 2b6c11f..930c97b 100644
+--- a/src/heap.cc
++++ b/src/heap.cc
+@@ -3519,6 +3519,7 @@ MaybeObject* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer,
+   String* answer = String::cast(result);
+   answer->set_length(chars);
+   answer->set_hash_field(hash_field);
++  SeqString::cast(result)->set_symbol_id(0);
+
+   ASSERT_EQ(size, answer->Size());
+
+@@ -3561,6 +3562,7 @@ MaybeObject* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) {
+   HeapObject::cast(result)->set_map(ascii_string_map());
+   String::cast(result)->set_length(length);
+   String::cast(result)->set_hash_field(String::kEmptyHashField);
++  SeqString::cast(result)->set_symbol_id(0);
+   ASSERT_EQ(size, HeapObject::cast(result)->Size());
+   return result;
+ }
+@@ -3596,6 +3598,7 @@ MaybeObject* Heap::AllocateRawTwoByteString(int length,
+   HeapObject::cast(result)->set_map(string_map());
+   String::cast(result)->set_length(length);
+   String::cast(result)->set_hash_field(String::kEmptyHashField);
++  SeqString::cast(result)->set_symbol_id(0);
+   ASSERT_EQ(size, HeapObject::cast(result)->Size());
+   return result;
+ }
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index 65aec5d..c82080d 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -1924,6 +1924,7 @@ INT_ACCESSORS(ExternalArray, length, kLengthOffset)
+
+
+ SMI_ACCESSORS(String, length, kLengthOffset)
++SMI_ACCESSORS(SeqString, symbol_id, kSymbolIdOffset)
+
+
+ uint32_t String::hash_field() {
+diff --git a/src/objects.cc b/src/objects.cc
+index df61956..dc4b260 100644
+--- a/src/objects.cc
++++ b/src/objects.cc
+@@ -5346,6 +5346,66 @@ static inline bool CompareStringContentsPartial(Isolate* isolate,
+   }
+ }
+
++bool String::SlowEqualsExternal(uc16 *string, int length) {
++  int len = this->length();
++  if (len != length) return false;
++  if (len == 0) return true;
++
++  // We know the strings are both non-empty. Compare the first chars
++  // before we try to flatten the strings.
++  if (this->Get(0) != string[0]) return false;
++
++  String* lhs = this->TryFlattenGetString();
++
++  if (lhs->IsFlat()) {
++    if (lhs->IsAsciiRepresentation()) {
++      Vector<const char> vec1 = lhs->ToAsciiVector();
++      VectorIterator<char> buf1(vec1);
++      VectorIterator<uc16> ib(string, length);
++      return CompareStringContents(&buf1, &ib);
++    } else {
++      Vector<const uc16> vec1 = lhs->ToUC16Vector();
++      Vector<const uc16> vec2(string, length);
++      return CompareRawStringContents(vec1, vec2);
++    }
++  } else {
++    Isolate* isolate = GetIsolate();
++    isolate->objects_string_compare_buffer_a()->Reset(0, lhs);
++    VectorIterator<uc16> ib(string, length);
++    return CompareStringContents(isolate->objects_string_compare_buffer_a(), &ib);
++  }
++}
++
++bool String::SlowEqualsExternal(char *string, int length)
++{
++  int len = this->length();
++  if (len != length) return false;
++  if (len == 0) return true;
++
++  // We know the strings are both non-empty. Compare the first chars
++  // before we try to flatten the strings.
++  if (this->Get(0) != string[0]) return false;
++
++  String* lhs = this->TryFlattenGetString();
++
++  if (StringShape(lhs).IsSequentialAscii()) {
++      const char* str1 = SeqAsciiString::cast(lhs)->GetChars();
++      return CompareRawStringContents(Vector<const char>(str1, len),
++                                      Vector<const char>(string, len));
++  }
++
++  if (lhs->IsFlat()) {
++      Vector<const uc16> vec1 = lhs->ToUC16Vector();
++      VectorIterator<const uc16> buf1(vec1);
++      VectorIterator<char> buf2(string, length);
++      return CompareStringContents(&buf1, &buf2);
++  } else {
++    Isolate* isolate = GetIsolate();
++    isolate->objects_string_compare_buffer_a()->Reset(0, lhs);
++    VectorIterator<char> ib(string, length);
++    return CompareStringContents(isolate->objects_string_compare_buffer_a(), &ib);
++  }
++}
+
+ bool String::SlowEquals(String* other) {
+   // Fast check: negative check with lengths.
+@@ -8655,9 +8715,24 @@ class AsciiSymbolKey : public SequentialSymbolKey<char> {
+
+   MaybeObject* AsObject() {
+     if (hash_field_ == 0) Hash();
+-    return HEAP->AllocateAsciiSymbol(string_, hash_field_);
++    MaybeObject *result = HEAP->AllocateAsciiSymbol(string_, hash_field_);
++    if (!result->IsFailure() && result->ToObjectUnchecked()->IsSeqString()) {
++        while (true) {
++            Atomic32 my_symbol_id = next_symbol_id;
++            if (my_symbol_id > Smi::kMaxValue)
++                break;
++            if (my_symbol_id == NoBarrier_CompareAndSwap(&next_symbol_id, my_symbol_id, my_symbol_id + 1)) {
++                SeqString::cast(result->ToObjectUnchecked())->set_symbol_id(my_symbol_id);
++                break;
++            }
++        }
++    }
++    return result;
+   }
++
++  static Atomic32 next_symbol_id;
+ };
++Atomic32 AsciiSymbolKey::next_symbol_id = 1;
+
+
+ class TwoByteSymbolKey : public SequentialSymbolKey<uc16> {
+diff --git a/src/objects.h b/src/objects.h
+index e966b3d..6e26f57 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -5359,6 +5359,9 @@ class String: public HeapObject {
+   bool IsAsciiEqualTo(Vector<const char> str);
+   bool IsTwoByteEqualTo(Vector<const uc16> str);
+
++  bool SlowEqualsExternal(uc16 *string, int length);
++  bool SlowEqualsExternal(char *string, int length);
++
+   // Return a UTF8 representation of the string.  The string is null
+   // terminated but may optionally contain nulls.  Length is returned
+   // in length_output if length_output is not a null pointer  The string
+@@ -5610,9 +5613,17 @@ class String: public HeapObject {
+ class SeqString: public String {
+  public:
+
++  // Get and set the symbol id of the string
++  inline int symbol_id();
++  inline void set_symbol_id(int value);
++
+   // Casting.
+   static inline SeqString* cast(Object* obj);
+
++  // Layout description.
++  static const int kSymbolIdOffset = String::kSize;
++  static const int kSize = kSymbolIdOffset + kPointerSize;
++
+  private:
+   DISALLOW_IMPLICIT_CONSTRUCTORS(SeqString);
+ };
+@@ -5647,7 +5658,7 @@ class SeqAsciiString: public SeqString {
+   }
+
+   // Layout description.
+-  static const int kHeaderSize = String::kSize;
++  static const int kHeaderSize = SeqString::kSize;
+   static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
+
+   // Maximal memory usage for a single sequential ASCII string.
+@@ -5701,7 +5712,7 @@ class SeqTwoByteString: public SeqString {
+   }
+
+   // Layout description.
+-  static const int kHeaderSize = String::kSize;
++  static const int kHeaderSize = SeqString::kSize;
+   static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
+
+   // Maximal memory usage for a single sequential two-byte string.
+--
+1.7.2.3
+
diff --git a/src/v8/0002-Add-a-bit-field-3-to-Map.patch b/src/v8/0002-Add-a-bit-field-3-to-Map.patch
new file mode 100644
index 00000000000..dda9fa0dffe
--- /dev/null
+++ b/src/v8/0002-Add-a-bit-field-3-to-Map.patch
@@ -0,0 +1,118 @@
+From 7c9cfff80b7864d5687432d424074e51712c4a07 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 23 May 2011 15:55:26 +1000
+Subject: [PATCH 02/13] Add a bit field 3 to Map
+
+Bit field 3 will be used to add QML specific map flags.
+---
+ src/heap.cc       |    2 ++
+ src/objects-inl.h |   10 ++++++++++
+ src/objects.cc    |    2 ++
+ src/objects.h     |    9 ++++++++-
+ 4 files changed, 22 insertions(+), 1 deletions(-)
+
+diff --git a/src/heap.cc b/src/heap.cc
+index 930c97b..900f462 100644
+--- a/src/heap.cc
++++ b/src/heap.cc
+@@ -1573,6 +1573,7 @@ MaybeObject* Heap::AllocatePartialMap(InstanceType instance_type,
+   reinterpret_cast<Map*>(result)->set_unused_property_fields(0);
+   reinterpret_cast<Map*>(result)->set_bit_field(0);
+   reinterpret_cast<Map*>(result)->set_bit_field2(0);
++  reinterpret_cast<Map*>(result)->set_bit_field3(0);
+   return result;
+ }
+
+@@ -1599,6 +1600,7 @@ MaybeObject* Heap::AllocateMap(InstanceType instance_type, int instance_size) {
+   map->set_unused_property_fields(0);
+   map->set_bit_field(0);
+   map->set_bit_field2((1 << Map::kIsExtensible) | (1 << Map::kHasFastElements));
++  map->set_bit_field3(0);
+
+   // If the map object is aligned fill the padding area with Smi 0 objects.
+   if (Map::kPadStart < Map::kSize) {
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index c82080d..cce3edd 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -2430,6 +2430,16 @@ void Map::set_bit_field2(byte value) {
+ }
+
+
++byte Map::bit_field3() {
++  return READ_BYTE_FIELD(this, kBitField3Offset);
++}
++
++
++void Map::set_bit_field3(byte value) {
++  WRITE_BYTE_FIELD(this, kBitField3Offset, value);
++}
++
++
+ void Map::set_non_instance_prototype(bool value) {
+   if (value) {
+     set_bit_field(bit_field() | (1 << kHasNonInstancePrototype));
+diff --git a/src/objects.cc b/src/objects.cc
+index dc4b260..79d7240 100644
+--- a/src/objects.cc
++++ b/src/objects.cc
+@@ -3614,6 +3614,7 @@ MaybeObject* Map::CopyDropDescriptors() {
+   }
+   Map::cast(result)->set_bit_field(bit_field());
+   Map::cast(result)->set_bit_field2(bit_field2());
++  Map::cast(result)->set_bit_field3(bit_field3());
+   Map::cast(result)->set_is_shared(false);
+   Map::cast(result)->ClearCodeCache(heap);
+   return result;
+@@ -3642,6 +3643,7 @@ MaybeObject* Map::CopyNormalized(PropertyNormalizationMode mode,
+
+   Map::cast(result)->set_bit_field(bit_field());
+   Map::cast(result)->set_bit_field2(bit_field2());
++  Map::cast(result)->set_bit_field3(bit_field3());
+
+   Map::cast(result)->set_is_shared(sharing == SHARED_NORMALIZED_MAP);
+
+diff --git a/src/objects.h b/src/objects.h
+index 6e26f57..07e1089 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -3597,6 +3597,10 @@ class Map: public HeapObject {
+   inline byte bit_field2();
+   inline void set_bit_field2(byte value);
+
++  // Bit field 3.
++  inline byte bit_field3();
++  inline void set_bit_field3(byte value);
++
+   // Tells whether the object in the prototype property will be used
+   // for instances created from this function.  If the prototype
+   // property is set to a value that is not a JSObject, the prototype
+@@ -3844,7 +3848,7 @@ class Map: public HeapObject {
+   // Layout description.
+   static const int kInstanceSizesOffset = HeapObject::kHeaderSize;
+   static const int kInstanceAttributesOffset = kInstanceSizesOffset + kIntSize;
+-  static const int kPrototypeOffset = kInstanceAttributesOffset + kIntSize;
++  static const int kPrototypeOffset = POINTER_SIZE_ALIGN(kInstanceAttributesOffset + 2 * kIntSize);
+   static const int kConstructorOffset = kPrototypeOffset + kPointerSize;
+   static const int kInstanceDescriptorsOffset =
+       kConstructorOffset + kPointerSize;
+@@ -3876,6 +3880,7 @@ class Map: public HeapObject {
+   static const int kUnusedPropertyFieldsOffset = kInstanceAttributesOffset + 1;
+   static const int kBitFieldOffset = kInstanceAttributesOffset + 2;
+   static const int kBitField2Offset = kInstanceAttributesOffset + 3;
++  static const int kBitField3Offset = kInstanceAttributesOffset + 4;
+
+   STATIC_CHECK(kInstanceTypeOffset == Internals::kMapInstanceTypeOffset);
+
+@@ -3898,6 +3903,8 @@ class Map: public HeapObject {
+   static const int kIsShared = 5;
+   static const int kHasExternalArrayElements = 6;
+
++  // Bit positions for bit field 3
++
+   // Layout of the default cache. It holds alternating name and code objects.
+   static const int kCodeCacheEntrySize = 2;
+   static const int kCodeCacheEntryNameOffset = 0;
+--
+1.7.2.3
+
diff --git a/src/v8/0003-Add-a-fallback-mode-for-named-property-interceptors.patch b/src/v8/0003-Add-a-fallback-mode-for-named-property-interceptors.patch
new file mode 100644
index 00000000000..50f97c7de8d
--- /dev/null
+++ b/src/v8/0003-Add-a-fallback-mode-for-named-property-interceptors.patch
@@ -0,0 +1,364 @@
+From ae8688b53d67044f2c9b0cce25fc282b078610c1 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 23 May 2011 16:21:02 +1000
+Subject: [PATCH 03/13] Add a "fallback" mode for named property interceptors
+
+By default interceptors are called before the normal property
+resolution on objects.  When an interceptor is installed as a
+"fallback" interceptor, it is only called if the object doesn't
+already have the property.
+
+In the case of a global object having an fallback interceptor,
+the interceptor is not invoked at all for var or function
+declarations.
+---
+ include/v8.h      |    8 ++++++++
+ src/api.cc        |   29 +++++++++++++++++++++++++++++
+ src/factory.cc    |    4 ++++
+ src/handles.cc    |    6 ++++--
+ src/handles.h     |    3 ++-
+ src/objects-inl.h |   16 ++++++++++++++++
+ src/objects.cc    |   22 ++++++++++++++++------
+ src/objects.h     |   18 ++++++++++++++----
+ src/runtime.cc    |   11 ++++++-----
+ 9 files changed, 99 insertions(+), 18 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index bbd29e9..85452aa 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -2169,6 +2169,7 @@ class V8EXPORT FunctionTemplate : public Template {
+                                        NamedPropertyQuery query,
+                                        NamedPropertyDeleter remover,
+                                        NamedPropertyEnumerator enumerator,
++                                       bool is_fallback,
+                                        Handle<Value> data);
+   void SetIndexedInstancePropertyHandler(IndexedPropertyGetter getter,
+                                          IndexedPropertySetter setter,
+@@ -2253,6 +2254,13 @@ class V8EXPORT ObjectTemplate : public Template {
+                                NamedPropertyEnumerator enumerator = 0,
+                                Handle<Value> data = Handle<Value>());
+
++  void SetFallbackPropertyHandler(NamedPropertyGetter getter,
++                                  NamedPropertySetter setter = 0,
++                                  NamedPropertyQuery query = 0,
++                                  NamedPropertyDeleter deleter = 0,
++                                  NamedPropertyEnumerator enumerator = 0,
++                                  Handle<Value> data = Handle<Value>());
++
+   /**
+    * Sets an indexed property handler on the object template.
+    *
+diff --git a/src/api.cc b/src/api.cc
+index 381935b..8b0b32a 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -981,6 +981,7 @@ void FunctionTemplate::SetNamedInstancePropertyHandler(
+       NamedPropertyQuery query,
+       NamedPropertyDeleter remover,
+       NamedPropertyEnumerator enumerator,
++      bool is_fallback,
+       Handle<Value> data) {
+   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+   if (IsDeadCheck(isolate,
+@@ -999,6 +1000,7 @@ void FunctionTemplate::SetNamedInstancePropertyHandler(
+   if (query != 0) SET_FIELD_WRAPPED(obj, set_query, query);
+   if (remover != 0) SET_FIELD_WRAPPED(obj, set_deleter, remover);
+   if (enumerator != 0) SET_FIELD_WRAPPED(obj, set_enumerator, enumerator);
++  obj->set_is_fallback(i::Smi::FromInt(is_fallback));
+
+   if (data.IsEmpty()) data = v8::Undefined();
+   obj->set_data(*Utils::OpenHandle(*data));
+@@ -1143,6 +1145,33 @@ void ObjectTemplate::SetNamedPropertyHandler(NamedPropertyGetter getter,
+                                                         query,
+                                                         remover,
+                                                         enumerator,
++                                                        false,
++                                                        data);
++}
++
++
++void ObjectTemplate::SetFallbackPropertyHandler(NamedPropertyGetter getter,
++                                                NamedPropertySetter setter,
++                                                NamedPropertyQuery query,
++                                                NamedPropertyDeleter remover,
++                                                NamedPropertyEnumerator enumerator,
++                                                Handle<Value> data) {
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetFallbackPropertyHandler()")) {
++    return;
++  }
++  ENTER_V8(isolate);
++  i::HandleScope scope(isolate);
++  EnsureConstructor(this);
++  i::FunctionTemplateInfo* constructor =
++      i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
++  i::Handle<i::FunctionTemplateInfo> cons(constructor);
++  Utils::ToLocal(cons)->SetNamedInstancePropertyHandler(getter,
++                                                        setter,
++                                                        query,
++                                                        remover,
++                                                        enumerator,
++                                                        true,
+                                                         data);
+ }
+
+diff --git a/src/factory.cc b/src/factory.cc
+index 7dee66f..dcdc645 100644
+--- a/src/factory.cc
++++ b/src/factory.cc
+@@ -1058,6 +1058,10 @@ Handle<JSFunction> Factory::CreateApiFunction(
+   // Set interceptor information in the map.
+   if (!obj->named_property_handler()->IsUndefined()) {
+     map->set_has_named_interceptor();
++
++    InterceptorInfo *nph = InterceptorInfo::cast(obj->named_property_handler());
++    bool is_fallback = nph->is_fallback()->IsUndefined()?false:nph->is_fallback()->value();
++    map->set_named_interceptor_is_fallback(is_fallback);
+   }
+   if (!obj->indexed_property_handler()->IsUndefined()) {
+     map->set_has_indexed_interceptor();
+diff --git a/src/handles.cc b/src/handles.cc
+index 326de86..dd3a86c 100644
+--- a/src/handles.cc
++++ b/src/handles.cc
+@@ -262,9 +262,11 @@ Handle<Object> SetProperty(Handle<JSObject> object,
+                            Handle<String> key,
+                            Handle<Object> value,
+                            PropertyAttributes attributes,
+-                           StrictModeFlag strict_mode) {
++                           StrictModeFlag strict_mode,
++                           bool skip_fallback_interceptor) {
+   CALL_HEAP_FUNCTION(object->GetIsolate(),
+-                     object->SetProperty(*key, *value, attributes, strict_mode),
++                     object->SetProperty(*key, *value, attributes, strict_mode,
++                                         skip_fallback_interceptor),
+                      Object);
+ }
+
+diff --git a/src/handles.h b/src/handles.h
+index 3839f37..4b42506 100644
+--- a/src/handles.h
++++ b/src/handles.h
+@@ -188,7 +188,8 @@ Handle<Object> SetProperty(Handle<JSObject> object,
+                            Handle<String> key,
+                            Handle<Object> value,
+                            PropertyAttributes attributes,
+-                           StrictModeFlag strict_mode);
++                           StrictModeFlag strict_mode,
++                           bool skip_fallback_interceptor = false);
+
+ Handle<Object> SetProperty(Handle<Object> object,
+                            Handle<Object> key,
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index cce3edd..6aaca2f 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -2521,6 +2521,21 @@ bool Map::is_shared() {
+ }
+
+
++void Map::set_named_interceptor_is_fallback(bool value)
++{
++  if (value) {
++    set_bit_field3(bit_field3() | (1 << kNamedInterceptorIsFallback));
++  } else {
++    set_bit_field3(bit_field3() & ~(1 << kNamedInterceptorIsFallback));
++  }
++}
++
++bool Map::named_interceptor_is_fallback()
++{
++  return ((1 << kNamedInterceptorIsFallback) & bit_field3()) != 0;
++}
++
++
+ JSFunction* Map::unchecked_constructor() {
+   return reinterpret_cast<JSFunction*>(READ_FIELD(this, kConstructorOffset));
+ }
+@@ -2970,6 +2985,7 @@ ACCESSORS(InterceptorInfo, query, Object, kQueryOffset)
+ ACCESSORS(InterceptorInfo, deleter, Object, kDeleterOffset)
+ ACCESSORS(InterceptorInfo, enumerator, Object, kEnumeratorOffset)
+ ACCESSORS(InterceptorInfo, data, Object, kDataOffset)
++ACCESSORS(InterceptorInfo, is_fallback, Smi, kFallbackOffset)
+
+ ACCESSORS(CallHandlerInfo, callback, Object, kCallbackOffset)
+ ACCESSORS(CallHandlerInfo, data, Object, kDataOffset)
+diff --git a/src/objects.cc b/src/objects.cc
+index 79d7240..15e2cdb 100644
+--- a/src/objects.cc
++++ b/src/objects.cc
+@@ -1712,9 +1712,10 @@ MaybeObject* JSObject::SetPropertyWithInterceptor(
+ MaybeObject* JSObject::SetProperty(String* name,
+                                    Object* value,
+                                    PropertyAttributes attributes,
+-                                   StrictModeFlag strict_mode) {
++                                   StrictModeFlag strict_mode,
++                                   bool skip_fallback_interceptor) {
+   LookupResult result;
+-  LocalLookup(name, &result);
++  LocalLookup(name, &result, skip_fallback_interceptor);
+   return SetProperty(&result, name, value, attributes, strict_mode);
+ }
+
+@@ -3148,7 +3149,8 @@ AccessorDescriptor* Map::FindAccessor(String* name) {
+ }
+
+
+-void JSObject::LocalLookup(String* name, LookupResult* result) {
++void JSObject::LocalLookup(String* name, LookupResult* result,
++                           bool skip_fallback_interceptor) {
+   ASSERT(name->IsString());
+
+   Heap* heap = GetHeap();
+@@ -3174,22 +3176,30 @@ void JSObject::LocalLookup(String* name, LookupResult* result) {
+   }
+
+   // Check for lookup interceptor except when bootstrapping.
+-  if (HasNamedInterceptor() && !heap->isolate()->bootstrapper()->IsActive()) {
++  bool wouldIntercept = HasNamedInterceptor() && !heap->isolate()->bootstrapper()->IsActive();
++  if (wouldIntercept && !map()->named_interceptor_is_fallback()) {
+     result->InterceptorResult(this);
+     return;
+   }
+
+   LocalLookupRealNamedProperty(name, result);
++
++  if (wouldIntercept && !skip_fallback_interceptor && !result->IsProperty() &&
++      map()->named_interceptor_is_fallback()) {
++    result->InterceptorResult(this);
++    return;
++  }
+ }
+
+
+-void JSObject::Lookup(String* name, LookupResult* result) {
++void JSObject::Lookup(String* name, LookupResult* result,
++                      bool skip_fallback_interceptor) {
+   // Ecma-262 3rd 8.6.2.4
+   Heap* heap = GetHeap();
+   for (Object* current = this;
+        current != heap->null_value();
+        current = JSObject::cast(current)->GetPrototype()) {
+-    JSObject::cast(current)->LocalLookup(name, result);
++    JSObject::cast(current)->LocalLookup(name, result, skip_fallback_interceptor);
+     if (result->IsProperty()) return;
+   }
+   result->NotFound();
+diff --git a/src/objects.h b/src/objects.h
+index 07e1089..a209cd0 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -1405,7 +1405,8 @@ class JSObject: public HeapObject {
+   MUST_USE_RESULT MaybeObject* SetProperty(String* key,
+                                            Object* value,
+                                            PropertyAttributes attributes,
+-                                           StrictModeFlag strict_mode);
++                                           StrictModeFlag strict_mode,
++                                           bool skip_fallback_interceptor = false);
+   MUST_USE_RESULT MaybeObject* SetProperty(LookupResult* result,
+                                            String* key,
+                                            Object* value,
+@@ -1637,8 +1638,8 @@ class JSObject: public HeapObject {
+
+   // Lookup a property.  If found, the result is valid and has
+   // detailed information.
+-  void LocalLookup(String* name, LookupResult* result);
+-  void Lookup(String* name, LookupResult* result);
++  void LocalLookup(String* name, LookupResult* result, bool skip_fallback_interceptor = false);
++  void Lookup(String* name, LookupResult* result, bool skip_fallback_interceptor = false);
+
+   // The following lookup functions skip interceptors.
+   void LocalLookupRealNamedProperty(String* name, LookupResult* result);
+@@ -3714,6 +3715,12 @@ class Map: public HeapObject {
+   inline void set_is_access_check_needed(bool access_check_needed);
+   inline bool is_access_check_needed();
+
++
++  // Whether the named interceptor is a fallback interceptor or not
++  inline void set_named_interceptor_is_fallback(bool value);
++  inline bool named_interceptor_is_fallback();
++
++
+   // [prototype]: implicit prototype object.
+   DECL_ACCESSORS(prototype, Object)
+
+@@ -3904,6 +3911,7 @@ class Map: public HeapObject {
+   static const int kHasExternalArrayElements = 6;
+
+   // Bit positions for bit field 3
++  static const int kNamedInterceptorIsFallback = 0;
+
+   // Layout of the default cache. It holds alternating name and code objects.
+   static const int kCodeCacheEntrySize = 2;
+@@ -6276,6 +6284,7 @@ class InterceptorInfo: public Struct {
+   DECL_ACCESSORS(deleter, Object)
+   DECL_ACCESSORS(enumerator, Object)
+   DECL_ACCESSORS(data, Object)
++  DECL_ACCESSORS(is_fallback, Smi)
+
+   static inline InterceptorInfo* cast(Object* obj);
+
+@@ -6295,7 +6304,8 @@ class InterceptorInfo: public Struct {
+   static const int kDeleterOffset = kQueryOffset + kPointerSize;
+   static const int kEnumeratorOffset = kDeleterOffset + kPointerSize;
+   static const int kDataOffset = kEnumeratorOffset + kPointerSize;
+-  static const int kSize = kDataOffset + kPointerSize;
++  static const int kFallbackOffset = kDataOffset + kPointerSize;
++  static const int kSize = kFallbackOffset + kPointerSize;
+
+  private:
+   DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptorInfo);
+diff --git a/src/runtime.cc b/src/runtime.cc
+index 7335da8..660352c 100644
+--- a/src/runtime.cc
++++ b/src/runtime.cc
+@@ -1097,7 +1097,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+       // Lookup the property in the global object, and don't set the
+       // value of the variable if the property is already there.
+       LookupResult lookup;
+-      global->Lookup(*name, &lookup);
++      global->Lookup(*name, &lookup, true);
+       if (lookup.IsProperty()) {
+         // Determine if the property is local by comparing the holder
+         // against the global object. The information will be used to
+@@ -1152,7 +1152,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+     }
+
+     LookupResult lookup;
+-    global->LocalLookup(*name, &lookup);
++    global->LocalLookup(*name, &lookup, true);
+
+     PropertyAttributes attributes = is_const_property
+         ? static_cast<PropertyAttributes>(base | READ_ONLY)
+@@ -1196,7 +1196,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+                                          name,
+                                          value,
+                                          attributes,
+-                                         strict_mode));
++                                         strict_mode,
++                                         true));
+     }
+   }
+
+@@ -1343,7 +1344,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+   JSObject* real_holder = global;
+   LookupResult lookup;
+   while (true) {
+-    real_holder->LocalLookup(*name, &lookup);
++    real_holder->LocalLookup(*name, &lookup, true);
+     if (lookup.IsProperty()) {
+       // Determine if this is a redeclaration of something read-only.
+       if (lookup.IsReadOnly()) {
+@@ -1400,7 +1401,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+
+   global = isolate->context()->global();
+   if (assign) {
+-    return global->SetProperty(*name, args[2], attributes, strict_mode);
++    return global->SetProperty(*name, args[2], attributes, strict_mode, true);
+   }
+   return isolate->heap()->undefined_value();
+ }
+--
+1.7.2.3
+
diff --git a/src/v8/0004-Generalize-external-object-resources.patch b/src/v8/0004-Generalize-external-object-resources.patch
new file mode 100644
index 00000000000..f44e7b21343
--- /dev/null
+++ b/src/v8/0004-Generalize-external-object-resources.patch
@@ -0,0 +1,894 @@
+From 4827116b12c50f6662794017c5a662b5dbb2da0b Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 23 May 2011 16:55:35 +1000
+Subject: [PATCH 04/13] Generalize external object resources
+
+V8 was already able to manage and finalize an external string
+resource.  This change generalizes that mechanism to handle a
+single generic external resource - a v8::Object::ExternalResource
+derived instance - on normal JSObject's.
+
+This is useful for mapping C++ objects to JS objects where the
+C++ object's memory is effectively owned by the JS Object, and
+thus needs to destroyed when the JS Object is garbage collected.
+The V8 mailing list suggests using a weak persistent handle for
+this purpose, but that seems to incur a fairly massive performance
+penalty for short lived objects as weak persistent handle callbacks
+are not called until the object has been promoted into the old
+object space.
+---
+ include/v8.h                                   |   25 ++++++
+ src/api.cc                                     |   64 ++++++++++++++-
+ src/extensions/externalize-string-extension.cc |    4 +-
+ src/factory.cc                                 |   11 +++
+ src/heap-inl.h                                 |  101 +++++++++++++++---------
+ src/heap.cc                                    |   68 ++++++++--------
+ src/heap.h                                     |   42 +++++-----
+ src/liveobjectlist.cc                          |    4 +-
+ src/mark-compact.cc                            |   21 +++---
+ src/objects-inl.h                              |   41 +++++++++-
+ src/objects.h                                  |   14 +++-
+ 11 files changed, 280 insertions(+), 115 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 85452aa..7f06ae7 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -1630,6 +1630,25 @@ class Object : public Value {
+   /** Sets a native pointer in an internal field. */
+   V8EXPORT void SetPointerInInternalField(int index, void* value);
+
++  class V8EXPORT ExternalResource { // NOLINT
++   public:
++    ExternalResource() {}
++    virtual ~ExternalResource() {}
++
++   protected:
++    virtual void Dispose() { delete this; }
++
++   private:
++    // Disallow copying and assigning.
++    ExternalResource(const ExternalResource&);
++    void operator=(const ExternalResource&);
++
++    friend class v8::internal::Heap;
++  };
++
++  V8EXPORT void SetExternalResource(ExternalResource *);
++  V8EXPORT ExternalResource *GetExternalResource();
++
+   // Testers for local properties.
+   V8EXPORT bool HasRealNamedProperty(Handle<String> key);
+   V8EXPORT bool HasRealIndexedProperty(uint32_t index);
+@@ -2331,6 +2350,12 @@ class V8EXPORT ObjectTemplate : public Template {
+    */
+   void SetInternalFieldCount(int value);
+
++  /**
++   * Sets whether the object can store an "external resource" object.
++   */
++  bool HasExternalResource();
++  void SetHasExternalResource(bool value);
++
+  private:
+   ObjectTemplate();
+   static Local<ObjectTemplate> New(Handle<FunctionTemplate> constructor);
+diff --git a/src/api.cc b/src/api.cc
+index 8b0b32a..1a6fbbb 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -1294,6 +1294,34 @@ void ObjectTemplate::SetInternalFieldCount(int value) {
+ }
+
+
++bool ObjectTemplate::HasExternalResource()
++{
++  if (IsDeadCheck(Utils::OpenHandle(this)->GetIsolate(),
++                  "v8::ObjectTemplate::HasExternalResource()")) {
++    return 0;
++  }
++  return !Utils::OpenHandle(this)->has_external_resource()->IsUndefined();
++}
++
++
++void ObjectTemplate::SetHasExternalResource(bool value)
++{
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetHasExternalResource()")) {
++    return;
++  }
++  ENTER_V8(isolate);
++  if (value) {
++    EnsureConstructor(this);
++  }
++  if (value) {
++      Utils::OpenHandle(this)->set_has_external_resource(i::Smi::FromInt(1));
++  } else {
++      Utils::OpenHandle(this)->set_has_external_resource(Utils::OpenHandle(this)->GetHeap()->undefined_value());
++  }
++}
++
++
+ // --- S c r i p t D a t a ---
+
+
+@@ -3652,6 +3680,34 @@ void v8::Object::SetPointerInInternalField(int index, void* value) {
+ }
+
+
++void v8::Object::SetExternalResource(v8::Object::ExternalResource *resource) {
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  ENTER_V8(isolate);
++  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
++  if (CanBeEncodedAsSmi(resource)) {
++    obj->SetExternalResourceObject(EncodeAsSmi(resource));
++  } else {
++    obj->SetExternalResourceObject(*isolate->factory()->NewProxy(static_cast<i::Address>((void *)resource)));
++  }
++  if (!obj->IsSymbol()) {
++    isolate->heap()->external_resource_table()->AddObject(*obj);
++  }
++}
++
++
++v8::Object::ExternalResource *v8::Object::GetExternalResource() {
++  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
++  i::Object* value = obj->GetExternalResourceObject();
++  if (value->IsSmi()) {
++    return reinterpret_cast<v8::Object::ExternalResource*>(i::Internals::GetExternalPointerFromSmi(value));
++  } else if (value->IsProxy()) {
++    return reinterpret_cast<v8::Object::ExternalResource*>(i::Proxy::cast(value)->proxy());
++  } else {
++    return NULL;
++  }
++}
++
++
+ // --- E n v i r o n m e n t ---
+
+
+@@ -4144,7 +4200,7 @@ Local<String> v8::String::NewExternal(
+   LOG_API(isolate, "String::NewExternal");
+   ENTER_V8(isolate);
+   i::Handle<i::String> result = NewExternalStringHandle(isolate, resource);
+-  isolate->heap()->external_string_table()->AddString(*result);
++  isolate->heap()->external_resource_table()->AddString(*result);
+   return Utils::ToLocal(result);
+ }
+
+@@ -4162,7 +4218,7 @@ bool v8::String::MakeExternal(v8::String::ExternalStringResource* resource) {
+   }
+   bool result = obj->MakeExternal(resource);
+   if (result && !obj->IsSymbol()) {
+-    isolate->heap()->external_string_table()->AddString(*obj);
++    isolate->heap()->external_resource_table()->AddString(*obj);
+   }
+   return result;
+ }
+@@ -4175,7 +4231,7 @@ Local<String> v8::String::NewExternal(
+   LOG_API(isolate, "String::NewExternal");
+   ENTER_V8(isolate);
+   i::Handle<i::String> result = NewExternalAsciiStringHandle(isolate, resource);
+-  isolate->heap()->external_string_table()->AddString(*result);
++  isolate->heap()->external_resource_table()->AddString(*result);
+   return Utils::ToLocal(result);
+ }
+
+@@ -4194,7 +4250,7 @@ bool v8::String::MakeExternal(
+   }
+   bool result = obj->MakeExternal(resource);
+   if (result && !obj->IsSymbol()) {
+-    isolate->heap()->external_string_table()->AddString(*obj);
++    isolate->heap()->external_resource_table()->AddString(*obj);
+   }
+   return result;
+ }
+diff --git a/src/extensions/externalize-string-extension.cc b/src/extensions/externalize-string-extension.cc
+index b3f83fe..8e50904 100644
+--- a/src/extensions/externalize-string-extension.cc
++++ b/src/extensions/externalize-string-extension.cc
+@@ -100,7 +100,7 @@ v8::Handle<v8::Value> ExternalizeStringExtension::Externalize(
+         data, string->length());
+     result = string->MakeExternal(resource);
+     if (result && !string->IsSymbol()) {
+-      HEAP->external_string_table()->AddString(*string);
++      HEAP->external_resource_table()->AddString(*string);
+     }
+     if (!result) delete resource;
+   } else {
+@@ -110,7 +110,7 @@ v8::Handle<v8::Value> ExternalizeStringExtension::Externalize(
+         data, string->length());
+     result = string->MakeExternal(resource);
+     if (result && !string->IsSymbol()) {
+-      HEAP->external_string_table()->AddString(*string);
++      HEAP->external_resource_table()->AddString(*string);
+     }
+     if (!result) delete resource;
+   }
+diff --git a/src/factory.cc b/src/factory.cc
+index dcdc645..d530a75 100644
+--- a/src/factory.cc
++++ b/src/factory.cc
+@@ -997,15 +997,21 @@ Handle<JSFunction> Factory::CreateApiFunction(
+   Handle<Code> construct_stub = isolate()->builtins()->JSConstructStubApi();
+
+   int internal_field_count = 0;
++  bool has_external_resource = false;
++
+   if (!obj->instance_template()->IsUndefined()) {
+     Handle<ObjectTemplateInfo> instance_template =
+         Handle<ObjectTemplateInfo>(
+             ObjectTemplateInfo::cast(obj->instance_template()));
+     internal_field_count =
+         Smi::cast(instance_template->internal_field_count())->value();
++    has_external_resource =
++        !instance_template->has_external_resource()->IsUndefined();
+   }
+
+   int instance_size = kPointerSize * internal_field_count;
++  if (has_external_resource) instance_size += kPointerSize;
++
+   InstanceType type = INVALID_TYPE;
+   switch (instance_type) {
+     case JavaScriptObject:
+@@ -1040,6 +1046,11 @@ Handle<JSFunction> Factory::CreateApiFunction(
+
+   Handle<Map> map = Handle<Map>(result->initial_map());
+
++  // Mark as having external data object if needed
++  if (has_external_resource) {
++    map->set_has_external_resource(true);
++  }
++
+   // Mark as undetectable if needed.
+   if (obj->undetectable()) {
+     map->set_is_undetectable();
+diff --git a/src/heap-inl.h b/src/heap-inl.h
+index f4fce7b..58e7adf 100644
+--- a/src/heap-inl.h
++++ b/src/heap-inl.h
+@@ -205,21 +205,36 @@ MaybeObject* Heap::NumberFromUint32(uint32_t value) {
+ }
+
+
+-void Heap::FinalizeExternalString(String* string) {
+-  ASSERT(string->IsExternalString());
+-  v8::String::ExternalStringResourceBase** resource_addr =
+-      reinterpret_cast<v8::String::ExternalStringResourceBase**>(
+-          reinterpret_cast<byte*>(string) +
+-          ExternalString::kResourceOffset -
+-          kHeapObjectTag);
+-
+-  // Dispose of the C++ object if it has not already been disposed.
+-  if (*resource_addr != NULL) {
+-    (*resource_addr)->Dispose();
+-  }
++void Heap::FinalizeExternalString(HeapObject* string) {
++  ASSERT(string->IsExternalString() || string->map()->has_external_resource());
++
++  if (string->IsExternalString()) {
++    v8::String::ExternalStringResourceBase** resource_addr =
++        reinterpret_cast<v8::String::ExternalStringResourceBase**>(
++            reinterpret_cast<byte*>(string) +
++            ExternalString::kResourceOffset -
++            kHeapObjectTag);
++
++    // Dispose of the C++ object if it has not already been disposed.
++    if (*resource_addr != NULL) {
++      (*resource_addr)->Dispose();
++    }
+
+-  // Clear the resource pointer in the string.
+-  *resource_addr = NULL;
++    // Clear the resource pointer in the string.
++    *resource_addr = NULL;
++  } else {
++    JSObject *object = JSObject::cast(string);
++    Object *value = object->GetExternalResourceObject();
++    v8::Object::ExternalResource *resource = 0;
++    if (value->IsSmi()) {
++        resource = reinterpret_cast<v8::Object::ExternalResource*>(Internals::GetExternalPointerFromSmi(value));
++    } else if (value->IsProxy()) {
++        resource = reinterpret_cast<v8::Object::ExternalResource*>(Proxy::cast(value)->proxy());
++    }
++    if (resource) {
++        resource->Dispose();
++    }
++  }
+ }
+
+
+@@ -556,53 +571,63 @@ inline bool Heap::allow_allocation(bool new_state) {
+ #endif
+
+
+-void ExternalStringTable::AddString(String* string) {
+-  ASSERT(string->IsExternalString());
++void ExternalResourceTable::AddString(String* string) {
++  ASSERT(string->IsExternalString() );
+   if (heap_->InNewSpace(string)) {
+-    new_space_strings_.Add(string);
++    new_space_objects_.Add(string);
++  } else {
++    old_space_objects_.Add(string);
++  }
++}
++
++
++void ExternalResourceTable::AddObject(HeapObject* object) {
++  ASSERT(object->map()->has_external_resource());
++  if (heap_->InNewSpace(object)) {
++    new_space_objects_.Add(object);
+   } else {
+-    old_space_strings_.Add(string);
++    old_space_objects_.Add(object);
+   }
+ }
+
+
+-void ExternalStringTable::Iterate(ObjectVisitor* v) {
+-  if (!new_space_strings_.is_empty()) {
+-    Object** start = &new_space_strings_[0];
+-    v->VisitPointers(start, start + new_space_strings_.length());
++void ExternalResourceTable::Iterate(ObjectVisitor* v) {
++  if (!new_space_objects_.is_empty()) {
++    Object** start = &new_space_objects_[0];
++    v->VisitPointers(start, start + new_space_objects_.length());
+   }
+-  if (!old_space_strings_.is_empty()) {
+-    Object** start = &old_space_strings_[0];
+-    v->VisitPointers(start, start + old_space_strings_.length());
++  if (!old_space_objects_.is_empty()) {
++    Object** start = &old_space_objects_[0];
++    v->VisitPointers(start, start + old_space_objects_.length());
+   }
+ }
+
+
+ // Verify() is inline to avoid ifdef-s around its calls in release
+ // mode.
+-void ExternalStringTable::Verify() {
++void ExternalResourceTable::Verify() {
+ #ifdef DEBUG
+-  for (int i = 0; i < new_space_strings_.length(); ++i) {
+-    ASSERT(heap_->InNewSpace(new_space_strings_[i]));
+-    ASSERT(new_space_strings_[i] != HEAP->raw_unchecked_null_value());
++  for (int i = 0; i < new_space_objects_.length(); ++i) {
++    ASSERT(heap_->InNewSpace(new_space_objects_[i]));
++    ASSERT(new_space_objects_[i] != HEAP->raw_unchecked_null_value());
+   }
+-  for (int i = 0; i < old_space_strings_.length(); ++i) {
+-    ASSERT(!heap_->InNewSpace(old_space_strings_[i]));
+-    ASSERT(old_space_strings_[i] != HEAP->raw_unchecked_null_value());
++  for (int i = 0; i < old_space_objects_.length(); ++i) {
++    ASSERT(!heap_->InNewSpace(old_space_objects_[i]));
++    ASSERT(old_space_objects_[i] != HEAP->raw_unchecked_null_value());
+   }
+ #endif
+ }
+
+
+-void ExternalStringTable::AddOldString(String* string) {
+-  ASSERT(string->IsExternalString());
+-  ASSERT(!heap_->InNewSpace(string));
+-  old_space_strings_.Add(string);
++void ExternalResourceTable::AddOldObject(HeapObject* object) {
++  ASSERT(object->IsExternalString() || object->map()->has_external_resource());
++  ASSERT(!heap_->InNewSpace(object));
++  old_space_objects_.Add(object);
+ }
+
+
+-void ExternalStringTable::ShrinkNewStrings(int position) {
+-  new_space_strings_.Rewind(position);
++void ExternalResourceTable::ShrinkNewObjects(int position) {
++  new_space_objects_.Rewind(position);
+   Verify();
+ }
+
+diff --git a/src/heap.cc b/src/heap.cc
+index 900f462..bf2940e 100644
+--- a/src/heap.cc
++++ b/src/heap.cc
+@@ -155,7 +155,7 @@ Heap::Heap()
+   memset(roots_, 0, sizeof(roots_[0]) * kRootListLength);
+   global_contexts_list_ = NULL;
+   mark_compact_collector_.heap_ = this;
+-  external_string_table_.heap_ = this;
++  external_resource_table_.heap_ = this;
+ }
+
+
+@@ -1030,8 +1030,8 @@ void Heap::Scavenge() {
+
+   new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
+
+-  UpdateNewSpaceReferencesInExternalStringTable(
+-      &UpdateNewSpaceReferenceInExternalStringTableEntry);
++  UpdateNewSpaceReferencesInExternalResourceTable(
++      &UpdateNewSpaceReferenceInExternalResourceTableEntry);
+
+   LiveObjectList::UpdateReferencesForScavengeGC();
+   isolate()->runtime_profiler()->UpdateSamplesAfterScavenge();
+@@ -1053,38 +1053,38 @@ void Heap::Scavenge() {
+ }
+
+
+-String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap,
+-                                                                Object** p) {
++HeapObject* Heap::UpdateNewSpaceReferenceInExternalResourceTableEntry(Heap* heap,
++                                                                      Object** p) {
+   MapWord first_word = HeapObject::cast(*p)->map_word();
+
+   if (!first_word.IsForwardingAddress()) {
+     // Unreachable external string can be finalized.
+-    heap->FinalizeExternalString(String::cast(*p));
++    heap->FinalizeExternalString(HeapObject::cast(*p));
+     return NULL;
+   }
+
+   // String is still reachable.
+-  return String::cast(first_word.ToForwardingAddress());
++  return HeapObject::cast(first_word.ToForwardingAddress());
+ }
+
+
+-void Heap::UpdateNewSpaceReferencesInExternalStringTable(
+-    ExternalStringTableUpdaterCallback updater_func) {
+-  external_string_table_.Verify();
++void Heap::UpdateNewSpaceReferencesInExternalResourceTable(
++    ExternalResourceTableUpdaterCallback updater_func) {
++  external_resource_table_.Verify();
+
+-  if (external_string_table_.new_space_strings_.is_empty()) return;
++  if (external_resource_table_.new_space_objects_.is_empty()) return;
+
+-  Object** start = &external_string_table_.new_space_strings_[0];
+-  Object** end = start + external_string_table_.new_space_strings_.length();
++  Object** start = &external_resource_table_.new_space_objects_[0];
++  Object** end = start + external_resource_table_.new_space_objects_.length();
+   Object** last = start;
+
+   for (Object** p = start; p < end; ++p) {
+     ASSERT(InFromSpace(*p));
+-    String* target = updater_func(this, p);
++    HeapObject* target = updater_func(this, p);
+
+     if (target == NULL) continue;
+
+-    ASSERT(target->IsExternalString());
++    ASSERT(target->IsExternalString() || target->map()->has_external_resource());
+
+     if (InNewSpace(target)) {
+       // String is still in new space.  Update the table entry.
+@@ -1092,12 +1092,12 @@ void Heap::UpdateNewSpaceReferencesInExternalStringTable(
+       ++last;
+     } else {
+       // String got promoted.  Move it to the old string list.
+-      external_string_table_.AddOldString(target);
++      external_resource_table_.AddOldObject(target);
+     }
+   }
+
+   ASSERT(last <= end);
+-  external_string_table_.ShrinkNewStrings(static_cast<int>(last - start));
++  external_resource_table_.ShrinkNewObjects(static_cast<int>(last - start));
+ }
+
+
+@@ -4468,7 +4468,7 @@ void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) {
+   v->Synchronize("symbol_table");
+   if (mode != VISIT_ALL_IN_SCAVENGE) {
+     // Scavenge collections have special processing for this.
+-    external_string_table_.Iterate(v);
++    external_resource_table_.Iterate(v);
+   }
+   v->Synchronize("external_string_table");
+ }
+@@ -4970,7 +4970,7 @@ void Heap::TearDown() {
+
+   isolate_->global_handles()->TearDown();
+
+-  external_string_table_.TearDown();
++  external_resource_table_.TearDown();
+
+   new_space_.TearDown();
+
+@@ -5835,31 +5835,31 @@ void TranscendentalCache::Clear() {
+ }
+
+
+-void ExternalStringTable::CleanUp() {
++void ExternalResourceTable::CleanUp() {
+   int last = 0;
+-  for (int i = 0; i < new_space_strings_.length(); ++i) {
+-    if (new_space_strings_[i] == heap_->raw_unchecked_null_value()) continue;
+-    if (heap_->InNewSpace(new_space_strings_[i])) {
+-      new_space_strings_[last++] = new_space_strings_[i];
++  for (int i = 0; i < new_space_objects_.length(); ++i) {
++    if (new_space_objects_[i] == heap_->raw_unchecked_null_value()) continue;
++    if (heap_->InNewSpace(new_space_objects_[i])) {
++      new_space_objects_[last++] = new_space_objects_[i];
+     } else {
+-      old_space_strings_.Add(new_space_strings_[i]);
++      old_space_objects_.Add(new_space_objects_[i]);
+     }
+   }
+-  new_space_strings_.Rewind(last);
++  new_space_objects_.Rewind(last);
+   last = 0;
+-  for (int i = 0; i < old_space_strings_.length(); ++i) {
+-    if (old_space_strings_[i] == heap_->raw_unchecked_null_value()) continue;
+-    ASSERT(!heap_->InNewSpace(old_space_strings_[i]));
+-    old_space_strings_[last++] = old_space_strings_[i];
++  for (int i = 0; i < old_space_objects_.length(); ++i) {
++    if (old_space_objects_[i] == heap_->raw_unchecked_null_value()) continue;
++    ASSERT(!heap_->InNewSpace(old_space_objects_[i]));
++    old_space_objects_[last++] = old_space_objects_[i];
+   }
+-  old_space_strings_.Rewind(last);
++  old_space_objects_.Rewind(last);
+   Verify();
+ }
+
+
+-void ExternalStringTable::TearDown() {
+-  new_space_strings_.Free();
+-  old_space_strings_.Free();
++void ExternalResourceTable::TearDown() {
++  new_space_objects_.Free();
++  old_space_objects_.Free();
+ }
+
+
+diff --git a/src/heap.h b/src/heap.h
+index ae4e9e7..8cbf378 100644
+--- a/src/heap.h
++++ b/src/heap.h
+@@ -237,8 +237,8 @@ class Isolate;
+ class WeakObjectRetainer;
+
+
+-typedef String* (*ExternalStringTableUpdaterCallback)(Heap* heap,
+-                                                      Object** pointer);
++typedef HeapObject* (*ExternalResourceTableUpdaterCallback)(Heap* heap,
++                                                            Object** pointer);
+
+ typedef bool (*DirtyRegionCallback)(Heap* heap,
+                                     Address start,
+@@ -284,43 +284,45 @@ class PromotionQueue {
+ };
+
+
+-// External strings table is a place where all external strings are
+-// registered.  We need to keep track of such strings to properly
+-// finalize them.
+-class ExternalStringTable {
++// External resource table is a place where all external strings and
++// objects with an external resource are registered.  We need to keep
++// track of such strings to properly finalize them.
++class ExternalResourceTable {
+  public:
+   // Registers an external string.
+   inline void AddString(String* string);
++  // Registers an external object.
++  inline void AddObject(HeapObject* object);
+
+   inline void Iterate(ObjectVisitor* v);
+
+   // Restores internal invariant and gets rid of collected strings.
+-  // Must be called after each Iterate() that modified the strings.
++  // Must be called after each Iterate() that modified the objects.
+   void CleanUp();
+
+   // Destroys all allocated memory.
+   void TearDown();
+
+  private:
+-  ExternalStringTable() { }
++  ExternalResourceTable() { }
+
+   friend class Heap;
+
+   inline void Verify();
+
+-  inline void AddOldString(String* string);
++  inline void AddOldObject(HeapObject* object);
+
+   // Notifies the table that only a prefix of the new list is valid.
+-  inline void ShrinkNewStrings(int position);
++  inline void ShrinkNewObjects(int position);
+
+   // To speed up scavenge collections new space string are kept
+   // separate from old space strings.
+-  List<Object*> new_space_strings_;
+-  List<Object*> old_space_strings_;
++  List<Object*> new_space_objects_;
++  List<Object*> old_space_objects_;
+
+   Heap* heap_;
+
+-  DISALLOW_COPY_AND_ASSIGN(ExternalStringTable);
++  DISALLOW_COPY_AND_ASSIGN(ExternalResourceTable);
+ };
+
+
+@@ -753,7 +755,7 @@ class Heap {
+
+   // Finalizes an external string by deleting the associated external
+   // data and clearing the resource pointer.
+-  inline void FinalizeExternalString(String* string);
++  inline void FinalizeExternalString(HeapObject* string);
+
+   // Allocates an uninitialized object.  The memory is non-executable if the
+   // hardware and OS allow.
+@@ -1191,8 +1193,8 @@ class Heap {
+     survived_since_last_expansion_ += survived;
+   }
+
+-  void UpdateNewSpaceReferencesInExternalStringTable(
+-      ExternalStringTableUpdaterCallback updater_func);
++  void UpdateNewSpaceReferencesInExternalResourceTable(
++      ExternalResourceTableUpdaterCallback updater_func);
+
+   void ProcessWeakReferences(WeakObjectRetainer* retainer);
+
+@@ -1228,8 +1230,8 @@ class Heap {
+     return &mark_compact_collector_;
+   }
+
+-  ExternalStringTable* external_string_table() {
+-    return &external_string_table_;
++  ExternalResourceTable* external_resource_table() {
++    return &external_resource_table_;
+   }
+
+   inline Isolate* isolate();
+@@ -1462,7 +1464,7 @@ class Heap {
+   // Performs a minor collection in new generation.
+   void Scavenge();
+
+-  static String* UpdateNewSpaceReferenceInExternalStringTableEntry(
++  static HeapObject* UpdateNewSpaceReferenceInExternalResourceTableEntry(
+       Heap* heap,
+       Object** pointer);
+
+@@ -1593,7 +1595,7 @@ class Heap {
+   // configured through the API until it is setup.
+   bool configured_;
+
+-  ExternalStringTable external_string_table_;
++  ExternalResourceTable external_resource_table_;
+
+   bool is_safe_to_read_maps_;
+
+diff --git a/src/liveobjectlist.cc b/src/liveobjectlist.cc
+index 5795a6b..8866e58 100644
+--- a/src/liveobjectlist.cc
++++ b/src/liveobjectlist.cc
+@@ -1989,7 +1989,7 @@ Object* LiveObjectList::PrintObj(int obj_id) {
+     ASSERT(resource->IsAscii());
+     Handle<String> dump_string =
+         Factory::NewExternalStringFromAscii(resource);
+-    ExternalStringTable::AddString(*dump_string);
++    ExternalResourceTable::AddString(*dump_string);
+     return *dump_string;
+   } else {
+     delete resource;
+@@ -2193,7 +2193,7 @@ Object* LiveObjectList::GetPathPrivate(HeapObject* obj1, HeapObject* obj2) {
+     ASSERT(resource->IsAscii());
+     Handle<String> path_string =
+         Factory::NewExternalStringFromAscii(resource);
+-    ExternalStringTable::AddString(*path_string);
++    ExternalResourceTable::AddString(*path_string);
+     return *path_string;
+   } else {
+     delete resource;
+diff --git a/src/mark-compact.cc b/src/mark-compact.cc
+index 68a5062..1b1e361 100644
+--- a/src/mark-compact.cc
++++ b/src/mark-compact.cc
+@@ -163,7 +163,7 @@ void MarkCompactCollector::Finish() {
+   // objects (empty string, illegal builtin).
+   heap()->isolate()->stub_cache()->Clear();
+
+-  heap()->external_string_table_.CleanUp();
++  heap()->external_resource_table_.CleanUp();
+
+   // If we've just compacted old space there's no reason to check the
+   // fragmentation limit. Just return.
+@@ -1019,8 +1019,9 @@ class SymbolTableCleaner : public ObjectVisitor {
+
+         // Since no objects have yet been moved we can safely access the map of
+         // the object.
+-        if ((*p)->IsExternalString()) {
+-          heap_->FinalizeExternalString(String::cast(*p));
++        if ((*p)->IsExternalString() ||
++            (*p)->IsHeapObject() && HeapObject::cast(*p)->map()->has_external_resource()) {
++          heap_->FinalizeExternalString(HeapObject::cast(*p));
+         }
+         // Set the entry to null_value (as deleted).
+         *p = heap_->raw_unchecked_null_value();
+@@ -1433,8 +1434,8 @@ void MarkCompactCollector::MarkLiveObjects() {
+   SymbolTableCleaner v(heap());
+   symbol_table->IterateElements(&v);
+   symbol_table->ElementsRemoved(v.PointersRemoved());
+-  heap()->external_string_table_.Iterate(&v);
+-  heap()->external_string_table_.CleanUp();
++  heap()->external_resource_table_.Iterate(&v);
++  heap()->external_resource_table_.CleanUp();
+
+   // Process the weak references.
+   MarkCompactWeakObjectRetainer mark_compact_object_retainer;
+@@ -1948,11 +1949,11 @@ static void UpdatePointerToNewGen(HeapObject** p) {
+ }
+
+
+-static String* UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap,
+-                                                                 Object** p) {
++static HeapObject* UpdateNewSpaceReferenceInExternalResourceTableEntry(Heap* heap,
++                                                                       Object** p) {
+   Address old_addr = HeapObject::cast(*p)->address();
+   Address new_addr = Memory::Address_at(old_addr);
+-  return String::cast(HeapObject::FromAddress(new_addr));
++  return HeapObject::FromAddress(new_addr);
+ }
+
+
+@@ -2083,8 +2084,8 @@ static void SweepNewSpace(Heap* heap, NewSpace* space) {
+   updating_visitor.VisitPointer(heap->global_contexts_list_address());
+
+   // Update pointers from external string table.
+-  heap->UpdateNewSpaceReferencesInExternalStringTable(
+-      &UpdateNewSpaceReferenceInExternalStringTableEntry);
++  heap->UpdateNewSpaceReferencesInExternalResourceTable(
++      &UpdateNewSpaceReferenceInExternalResourceTableEntry);
+
+   // All pointers were updated. Update auxiliary allocation info.
+   heap->IncrementYoungSurvivorsCounter(survivors_size);
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index 6aaca2f..231b835 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -1392,13 +1392,13 @@ int JSObject::GetInternalFieldCount() {
+   // Make sure to adjust for the number of in-object properties. These
+   // properties do contribute to the size, but are not internal fields.
+   return ((Size() - GetHeaderSize()) >> kPointerSizeLog2) -
+-         map()->inobject_properties();
++         map()->inobject_properties() - map()->has_external_resource()?1:0;
+ }
+
+
+ int JSObject::GetInternalFieldOffset(int index) {
+   ASSERT(index < GetInternalFieldCount() && index >= 0);
+-  return GetHeaderSize() + (kPointerSize * index);
++  return GetHeaderSize() + (kPointerSize * (index + map()->has_external_resource()?1:0));
+ }
+
+
+@@ -1407,7 +1407,7 @@ Object* JSObject::GetInternalField(int index) {
+   // Internal objects do follow immediately after the header, whereas in-object
+   // properties are at the end of the object. Therefore there is no need
+   // to adjust the index here.
+-  return READ_FIELD(this, GetHeaderSize() + (kPointerSize * index));
++  return READ_FIELD(this, GetHeaderSize() + (kPointerSize * (index + map()->has_external_resource()?1:0)));
+ }
+
+
+@@ -1416,12 +1416,29 @@ void JSObject::SetInternalField(int index, Object* value) {
+   // Internal objects do follow immediately after the header, whereas in-object
+   // properties are at the end of the object. Therefore there is no need
+   // to adjust the index here.
+-  int offset = GetHeaderSize() + (kPointerSize * index);
++  int offset = GetHeaderSize() + (kPointerSize * (index + map()->has_external_resource()?1:0));
+   WRITE_FIELD(this, offset, value);
+   WRITE_BARRIER(this, offset);
+ }
+
+
++void JSObject::SetExternalResourceObject(Object *value) {
++  ASSERT(map()->has_external_resource());
++  int offset = GetHeaderSize();
++  WRITE_FIELD(this, offset, value);
++  WRITE_BARRIER(this, offset);
++}
++
++
++Object *JSObject::GetExternalResourceObject() {
++  if (map()->has_external_resource()) {
++    return READ_FIELD(this, GetHeaderSize());
++  } else {
++    return GetHeap()->undefined_value();
++  }
++}
++
++
+ // Access fast-case object properties at index. The use of these routines
+ // is needed to correctly distinguish between properties stored in-object and
+ // properties stored in the properties array.
+@@ -2521,6 +2538,20 @@ bool Map::is_shared() {
+ }
+
+
++void Map::set_has_external_resource(bool value) {
++  if (value) {
++    set_bit_field3(bit_field3() | (1 << kHasExternalResource));
++  } else {
++    set_bit_field3(bit_field3() & ~(1 << kHasExternalResource));
++  }
++}
++
++bool Map::has_external_resource()
++{
++    return ((1 << kHasExternalResource) & bit_field3()) != 0;
++}
++
++
+ void Map::set_named_interceptor_is_fallback(bool value)
+ {
+   if (value) {
+@@ -3017,6 +3048,8 @@ ACCESSORS(FunctionTemplateInfo, flag, Smi, kFlagOffset)
+ ACCESSORS(ObjectTemplateInfo, constructor, Object, kConstructorOffset)
+ ACCESSORS(ObjectTemplateInfo, internal_field_count, Object,
+           kInternalFieldCountOffset)
++ACCESSORS(ObjectTemplateInfo, has_external_resource, Object,
++          kHasExternalResourceOffset)
+
+ ACCESSORS(SignatureInfo, receiver, Object, kReceiverOffset)
+ ACCESSORS(SignatureInfo, args, Object, kArgsOffset)
+diff --git a/src/objects.h b/src/objects.h
+index a209cd0..1bdb5c7 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -1636,6 +1636,9 @@ class JSObject: public HeapObject {
+   inline Object* GetInternalField(int index);
+   inline void SetInternalField(int index, Object* value);
+
++  inline void SetExternalResourceObject(Object *);
++  inline Object *GetExternalResourceObject();
++
+   // Lookup a property.  If found, the result is valid and has
+   // detailed information.
+   void LocalLookup(String* name, LookupResult* result, bool skip_fallback_interceptor = false);
+@@ -3715,6 +3718,12 @@ class Map: public HeapObject {
+   inline void set_is_access_check_needed(bool access_check_needed);
+   inline bool is_access_check_needed();
+
++
++  // Tells whether the instance has the space for an external resource
++  // object
++  inline void set_has_external_resource(bool value);
++  inline bool has_external_resource();
++
+
+   // Whether the named interceptor is a fallback interceptor or not
+   inline void set_named_interceptor_is_fallback(bool value);
+@@ -3912,6 +3921,7 @@ class Map: public HeapObject {
+
+   // Bit positions for bit field 3
+   static const int kNamedInterceptorIsFallback = 0;
++  static const int kHasExternalResource = 1;
+
+   // Layout of the default cache. It holds alternating name and code objects.
+   static const int kCodeCacheEntrySize = 2;
+@@ -6426,6 +6436,7 @@ class ObjectTemplateInfo: public TemplateInfo {
+  public:
+   DECL_ACCESSORS(constructor, Object)
+   DECL_ACCESSORS(internal_field_count, Object)
++  DECL_ACCESSORS(has_external_resource, Object)
+
+   static inline ObjectTemplateInfo* cast(Object* obj);
+
+@@ -6442,7 +6453,8 @@ class ObjectTemplateInfo: public TemplateInfo {
+   static const int kConstructorOffset = TemplateInfo::kHeaderSize;
+   static const int kInternalFieldCountOffset =
+       kConstructorOffset + kPointerSize;
+-  static const int kSize = kInternalFieldCountOffset + kPointerSize;
++  static const int kHasExternalResourceOffset = kInternalFieldCountOffset + kPointerSize;
++  static const int kSize = kHasExternalResourceOffset + kPointerSize;
+ };
+
+
+--
+1.7.2.3
+
diff --git a/src/v8/0005-Introduce-a-QML-compilation-mode.patch b/src/v8/0005-Introduce-a-QML-compilation-mode.patch
new file mode 100644
index 00000000000..b464e612663
--- /dev/null
+++ b/src/v8/0005-Introduce-a-QML-compilation-mode.patch
@@ -0,0 +1,1777 @@
+From fd7d475e298e5b63cd6383c78cc900635c82aa38 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 23 May 2011 18:26:19 +1000
+Subject: [PATCH 05/13] Introduce a QML compilation mode
+
+In QML mode, there is a second global object - known as the QML
+global object.  During property resolution, if a property is not
+present on the JS global object, it is resolve on the QML global
+object.
+
+This global object behavior is only enabled if a script is being
+compiled in QML mode.  The object to use as the QML global object
+is passed as a parameter to the Script::Run() method.  Any function
+closures etc. created during the run will retain a reference to this
+object, so different objects can be passed in different script
+runs.
+---
+ include/v8.h                     |   18 ++++++++--
+ src/api.cc                       |   52 ++++++++++++++++++++++++-----
+ src/arm/code-stubs-arm.cc        |    4 ++
+ src/arm/full-codegen-arm.cc      |   26 ++++++++------
+ src/arm/lithium-arm.cc           |    2 +-
+ src/arm/lithium-arm.h            |    6 +++-
+ src/arm/lithium-codegen-arm.cc   |    7 ++--
+ src/arm/macro-assembler-arm.h    |    5 +++
+ src/ast-inl.h                    |    5 +++
+ src/ast.h                        |    1 +
+ src/code-stubs.h                 |    2 +-
+ src/compiler.cc                  |   15 +++++++-
+ src/compiler.h                   |   22 ++++++++++--
+ src/contexts.cc                  |   23 +++++++++++++
+ src/contexts.h                   |    4 ++
+ src/execution.cc                 |   28 +++++++++++++--
+ src/execution.h                  |    6 +++
+ src/full-codegen.cc              |    3 +-
+ src/full-codegen.h               |    1 +
+ src/heap.cc                      |    2 +
+ src/hydrogen-instructions.h      |   10 ++++-
+ src/hydrogen.cc                  |    2 +
+ src/ia32/code-stubs-ia32.cc      |    7 ++++
+ src/ia32/full-codegen-ia32.cc    |   26 ++++++++------
+ src/ia32/lithium-codegen-ia32.cc |    7 ++--
+ src/ia32/lithium-ia32.cc         |    2 +-
+ src/ia32/lithium-ia32.h          |    6 +++-
+ src/ia32/macro-assembler-ia32.h  |    5 +++
+ src/objects-inl.h                |   12 +++++++
+ src/objects.h                    |    5 +++
+ src/parser.cc                    |   27 +++++++++++++--
+ src/parser.h                     |    4 ++-
+ src/prettyprinter.cc             |    3 ++
+ src/runtime.cc                   |   68 ++++++++++++++++++++++++-------------
+ src/runtime.h                    |    8 ++--
+ src/scopes.cc                    |   10 +++++
+ src/scopes.h                     |    7 ++++
+ src/variables.cc                 |    3 +-
+ src/variables.h                  |    5 +++
+ src/x64/code-stubs-x64.cc        |    4 ++
+ src/x64/full-codegen-x64.cc      |   26 ++++++++------
+ src/x64/lithium-codegen-x64.cc   |    7 ++--
+ src/x64/lithium-x64.cc           |    2 +-
+ src/x64/lithium-x64.h            |    6 +++
+ src/x64/macro-assembler-x64.h    |    5 +++
+ 45 files changed, 391 insertions(+), 108 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 7f06ae7..a858eae 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -577,6 +577,10 @@ class ScriptOrigin {
+  */
+ class V8EXPORT Script {
+  public:
++  enum CompileFlags {
++      Default = 0x00,
++      QmlMode = 0x01
++  };
+
+   /**
+    * Compiles the specified script (context-independent).
+@@ -596,7 +600,8 @@ class V8EXPORT Script {
+   static Local<Script> New(Handle<String> source,
+                            ScriptOrigin* origin = NULL,
+                            ScriptData* pre_data = NULL,
+-                           Handle<String> script_data = Handle<String>());
++                           Handle<String> script_data = Handle<String>(),
++                           CompileFlags = Default);
+
+   /**
+    * Compiles the specified script using the specified file name
+@@ -609,7 +614,8 @@ class V8EXPORT Script {
+    *   will use the currently entered context).
+    */
+   static Local<Script> New(Handle<String> source,
+-                           Handle<Value> file_name);
++                           Handle<Value> file_name,
++                           CompileFlags = Default);
+
+   /**
+    * Compiles the specified script (bound to current context).
+@@ -630,7 +636,8 @@ class V8EXPORT Script {
+   static Local<Script> Compile(Handle<String> source,
+                                ScriptOrigin* origin = NULL,
+                                ScriptData* pre_data = NULL,
+-                               Handle<String> script_data = Handle<String>());
++                               Handle<String> script_data = Handle<String>(),
++                               CompileFlags = Default);
+
+   /**
+    * Compiles the specified script using the specified file name
+@@ -647,7 +654,8 @@ class V8EXPORT Script {
+    */
+   static Local<Script> Compile(Handle<String> source,
+                                Handle<Value> file_name,
+-                               Handle<String> script_data = Handle<String>());
++                               Handle<String> script_data = Handle<String>(),
++                               CompileFlags = Default);
+
+   /**
+    * Runs the script returning the resulting value.  If the script is
+@@ -657,6 +665,7 @@ class V8EXPORT Script {
+    * compiled.
+    */
+   Local<Value> Run();
++  Local<Value> Run(Handle<Object> qml);
+
+   /**
+    * Returns the script id value.
+@@ -3326,6 +3335,7 @@ class V8EXPORT Context {
+    * JavaScript frames an empty handle is returned.
+    */
+   static Local<Context> GetCalling();
++  static Local<Object> GetCallingQmlGlobal();
+
+   /**
+    * Sets the security token for the context.  To access an object in
+diff --git a/src/api.cc b/src/api.cc
+index 1a6fbbb..39767f4 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -1372,7 +1372,8 @@ ScriptData* ScriptData::New(const char* data, int length) {
+ Local<Script> Script::New(v8::Handle<String> source,
+                           v8::ScriptOrigin* origin,
+                           v8::ScriptData* pre_data,
+-                          v8::Handle<String> script_data) {
++                          v8::Handle<String> script_data,
++                          v8::Script::CompileFlags compile_flags) {
+   i::Isolate* isolate = i::Isolate::Current();
+   ON_BAILOUT(isolate, "v8::Script::New()", return Local<Script>());
+   LOG_API(isolate, "Script::New");
+@@ -1409,7 +1410,8 @@ Local<Script> Script::New(v8::Handle<String> source,
+                            NULL,
+                            pre_data_impl,
+                            Utils::OpenHandle(*script_data),
+-                           i::NOT_NATIVES_CODE);
++                           i::NOT_NATIVES_CODE,
++                           compile_flags);
+   has_pending_exception = result.is_null();
+   EXCEPTION_BAILOUT_CHECK(isolate, Local<Script>());
+   return Local<Script>(ToApi<Script>(result));
+@@ -1417,21 +1419,23 @@ Local<Script> Script::New(v8::Handle<String> source,
+
+
+ Local<Script> Script::New(v8::Handle<String> source,
+-                          v8::Handle<Value> file_name) {
++                          v8::Handle<Value> file_name,
++                          v8::Script::CompileFlags compile_flags) {
+   ScriptOrigin origin(file_name);
+-  return New(source, &origin);
++  return New(source, &origin, 0, Handle<String>(), compile_flags);
+ }
+
+
+ Local<Script> Script::Compile(v8::Handle<String> source,
+                               v8::ScriptOrigin* origin,
+                               v8::ScriptData* pre_data,
+-                              v8::Handle<String> script_data) {
++                              v8::Handle<String> script_data,
++                              v8::Script::CompileFlags compile_flags) {
+   i::Isolate* isolate = i::Isolate::Current();
+   ON_BAILOUT(isolate, "v8::Script::Compile()", return Local<Script>());
+   LOG_API(isolate, "Script::Compile");
+   ENTER_V8(isolate);
+-  Local<Script> generic = New(source, origin, pre_data, script_data);
++  Local<Script> generic = New(source, origin, pre_data, script_data, compile_flags);
+   if (generic.IsEmpty())
+     return generic;
+   i::Handle<i::Object> obj = Utils::OpenHandle(*generic);
+@@ -1447,13 +1451,18 @@ Local<Script> Script::Compile(v8::Handle<String> source,
+
+ Local<Script> Script::Compile(v8::Handle<String> source,
+                               v8::Handle<Value> file_name,
+-                              v8::Handle<String> script_data) {
++                              v8::Handle<String> script_data,
++                              v8::Script::CompileFlags compile_flags) {
+   ScriptOrigin origin(file_name);
+-  return Compile(source, &origin, 0, script_data);
++  return Compile(source, &origin, 0, script_data, compile_flags);
+ }
+
+
+ Local<Value> Script::Run() {
++    return Run(Handle<Object>());
++}
++
++Local<Value> Script::Run(Handle<Object> qml) {
+   i::Isolate* isolate = i::Isolate::Current();
+   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
+   LOG_API(isolate, "Script::Run");
+@@ -1472,10 +1481,11 @@ Local<Value> Script::Run() {
+       fun = i::Handle<i::JSFunction>(i::JSFunction::cast(*obj), isolate);
+     }
+     EXCEPTION_PREAMBLE(isolate);
++    i::Handle<i::Object> qmlglobal = Utils::OpenHandle(*qml);
+     i::Handle<i::Object> receiver(
+         isolate->context()->global_proxy(), isolate);
+     i::Handle<i::Object> result =
+-        i::Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
++        i::Execution::Call(fun, receiver, 0, NULL, &has_pending_exception, qmlglobal);
+     EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
+     raw_result = *result;
+   }
+@@ -3943,6 +3953,30 @@ v8::Local<v8::Context> Context::GetCalling() {
+ }
+
+
++v8::Local<v8::Object> Context::GetCallingQmlGlobal() {
++  i::Isolate* isolate = i::Isolate::Current();
++  if (IsDeadCheck(isolate, "v8::Context::GetCallingQmlGlobal()")) {
++    return Local<Object>();
++  }
++
++  i::Context *context = isolate->context();
++  if (!context->qml_global()->IsUndefined()) {
++    i::Handle<i::Object> qmlglobal(context->qml_global());
++    return Utils::ToLocal(i::Handle<i::JSObject>::cast(qmlglobal));
++  }
++
++  i::JavaScriptFrameIterator it;
++  if (it.done()) return Local<Object>();
++  context = i::Context::cast(it.frame()->context());
++  if (!context->qml_global()->IsUndefined()) {
++    i::Handle<i::Object> qmlglobal(context->qml_global());
++    return Utils::ToLocal(i::Handle<i::JSObject>::cast(qmlglobal));
++  } else {
++      return Local<Object>();
++  }
++}
++
++
+ v8::Local<v8::Object> Context::Global() {
+   if (IsDeadCheck(i::Isolate::Current(), "v8::Context::Global()")) {
+     return Local<v8::Object>();
+diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
+index 8c147f9..a2626bf 100644
+--- a/src/arm/code-stubs-arm.cc
++++ b/src/arm/code-stubs-arm.cc
+@@ -166,6 +166,10 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
+   __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+   __ str(r1, MemOperand(r0, Context::SlotOffset(Context::GLOBAL_INDEX)));
+
++  // Copy the qml global object from the surrounding context.
++  __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
++  __ str(r1, MemOperand(r0, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
++
+   // Initialize the rest of the slots to undefined.
+   __ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
+   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
+diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
+index 871b453..a69f10d 100644
+--- a/src/arm/full-codegen-arm.cc
++++ b/src/arm/full-codegen-arm.cc
+@@ -154,12 +154,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment cmnt(masm_, "[ Allocate local context");
+     // Argument to NewContext is the function, which is in r1.
+     __ push(r1);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -1247,9 +1248,9 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
+     __ bind(&fast);
+   }
+
+-  __ ldr(r0, GlobalObjectOperand());
++  __ ldr(r0, slot->var()->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+   __ mov(r2, Operand(slot->var()->name()));
+-  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
++  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
+       ? RelocInfo::CODE_TARGET
+       : RelocInfo::CODE_TARGET_CONTEXT;
+   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+@@ -1268,10 +1269,10 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
+     Comment cmnt(masm_, "Global variable");
+     // Use inline caching. Variable name is passed in r2 and the global
+     // object (receiver) in r0.
+-    __ ldr(r0, GlobalObjectOperand());
++    __ ldr(r0, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+     __ mov(r2, Operand(var->name()));
+     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+     context()->Plug(r0);
+
+   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
+@@ -1893,11 +1894,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
+     // assignment.  Right-hand-side value is passed in r0, variable name in
+     // r2, and the global object in r1.
+     __ mov(r2, Operand(var->name()));
+-    __ ldr(r1, GlobalObjectOperand());
++    __ ldr(r1, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+     Handle<Code> ic = is_strict_mode()
+         ? isolate()->builtins()->StoreIC_Initialize_Strict()
+         : isolate()->builtins()->StoreIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+
+   } else if (op == Token::INIT_CONST) {
+     // Like var declarations, const declarations are hoisted to function
+@@ -2184,10 +2185,13 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+   // Push the strict mode flag.
+   __ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
+   __ push(r1);
++  // Push the qml mode flag.
++  __ mov(r1, Operand(Smi::FromInt(is_qml_mode())));
++  __ push(r1);
+
+   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
+-                 : Runtime::kResolvePossiblyDirectEval, 4);
++                 : Runtime::kResolvePossiblyDirectEval, 5);
+ }
+
+
+@@ -2263,9 +2267,9 @@ void FullCodeGenerator::VisitCall(Call* expr) {
+     context()->DropAndPlug(1, r0);
+   } else if (var != NULL && !var->is_this() && var->is_global()) {
+     // Push global object as receiver for the call IC.
+-    __ ldr(r0, GlobalObjectOperand());
++    __ ldr(r0, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+     __ push(r0);
+-    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallWithIC(expr, var->name(), var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+   } else if (var != NULL && var->AsSlot() != NULL &&
+              var->AsSlot()->type() == Slot::LOOKUP) {
+     // Call to a lookup slot (dynamically introduced variable).
+diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
+index 3f1d15b..8406a96 100644
+--- a/src/arm/lithium-arm.cc
++++ b/src/arm/lithium-arm.cc
+@@ -1195,7 +1195,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
+
+ LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
+   LOperand* context = UseRegisterAtStart(instr->value());
+-  return DefineAsRegister(new LGlobalObject(context));
++  return DefineAsRegister(new LGlobalObject(context, instr->qml_global()));
+ }
+
+
+diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
+index 6da7c86..10b901f 100644
+--- a/src/arm/lithium-arm.h
++++ b/src/arm/lithium-arm.h
+@@ -1378,13 +1378,17 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
+
+ class LGlobalObject: public LTemplateInstruction<1, 1, 0> {
+  public:
+-  explicit LGlobalObject(LOperand* context) {
++  explicit LGlobalObject(LOperand* context, bool qml_global) {
+     inputs_[0] = context;
++    qml_global_ = qml_global;
+   }
+
+   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
+
+   LOperand* context() { return InputAt(0); }
++  bool qml_global() { return qml_global_; }
++ private:
++  bool qml_global_;
+ };
+
+
+diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
+index 4912449..db114ea 100644
+--- a/src/arm/lithium-codegen-arm.cc
++++ b/src/arm/lithium-codegen-arm.cc
+@@ -166,12 +166,13 @@ bool LCodeGen::GeneratePrologue() {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment(";;; Allocate local context");
+     // Argument to NewContext is the function, which is in r1.
+     __ push(r1);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -2664,7 +2665,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
+ void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
+   Register context = ToRegister(instr->context());
+   Register result = ToRegister(instr->result());
+-  __ ldr(result, ContextOperand(cp, Context::GLOBAL_INDEX));
++  __ ldr(result, ContextOperand(cp, instr->qml_global()?Context::QML_GLOBAL_INDEX:Context::GLOBAL_INDEX));
+ }
+
+
+diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
+index ab5efb0..d40cdbc 100644
+--- a/src/arm/macro-assembler-arm.h
++++ b/src/arm/macro-assembler-arm.h
+@@ -1056,6 +1056,11 @@ static inline MemOperand GlobalObjectOperand()  {
+ }
+
+
++static inline MemOperand QmlGlobalObjectOperand()  {
++  return ContextOperand(cp, Context::QML_GLOBAL_INDEX);
++}
++
++
+ #ifdef GENERATED_CODE_COVERAGE
+ #define CODE_COVERAGE_STRINGIFY(x) #x
+ #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
+diff --git a/src/ast-inl.h b/src/ast-inl.h
+index d80684a..adc5a1f 100644
+--- a/src/ast-inl.h
++++ b/src/ast-inl.h
+@@ -106,6 +106,11 @@ bool FunctionLiteral::strict_mode() const {
+ }
+
+
++bool FunctionLiteral::qml_mode() const {
++  return scope()->is_qml_mode();
++}
++
++
+ } }  // namespace v8::internal
+
+ #endif  // V8_AST_INL_H_
+diff --git a/src/ast.h b/src/ast.h
+index 65a25a9..f790dc0 100644
+--- a/src/ast.h
++++ b/src/ast.h
+@@ -1712,6 +1712,7 @@ class FunctionLiteral: public Expression {
+   int end_position() const { return end_position_; }
+   bool is_expression() const { return is_expression_; }
+   bool strict_mode() const;
++  bool qml_mode() const;
+
+   int materialized_literal_count() { return materialized_literal_count_; }
+   int expected_property_count() { return expected_property_count_; }
+diff --git a/src/code-stubs.h b/src/code-stubs.h
+index 56ef072..37e5383 100644
+--- a/src/code-stubs.h
++++ b/src/code-stubs.h
+@@ -303,7 +303,7 @@ class FastNewContextStub : public CodeStub {
+   static const int kMaximumSlots = 64;
+
+   explicit FastNewContextStub(int slots) : slots_(slots) {
+-    ASSERT(slots_ > 0 && slots <= kMaximumSlots);
++    ASSERT(slots_ >= 0 && slots <= kMaximumSlots);
+   }
+
+   void Generate(MacroAssembler* masm);
+diff --git a/src/compiler.cc b/src/compiler.cc
+index 86d5de3..d2191b9 100755
+--- a/src/compiler.cc
++++ b/src/compiler.cc
+@@ -462,7 +462,8 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
+                                              v8::Extension* extension,
+                                              ScriptDataImpl* input_pre_data,
+                                              Handle<Object> script_data,
+-                                             NativesFlag natives) {
++                                             NativesFlag natives,
++                                             v8::Script::CompileFlags compile_flags) {
+   Isolate* isolate = source->GetIsolate();
+   int source_length = source->length();
+   isolate->counters()->total_load_size()->Increment(source_length);
+@@ -523,6 +524,7 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
+     info.MarkAsGlobal();
+     info.SetExtension(extension);
+     info.SetPreParseData(pre_data);
++    if (compile_flags & v8::Script::QmlMode) info.MarkAsQmlMode();
+     if (natives == NATIVES_CODE) info.MarkAsAllowingNativesSyntax();
+     result = MakeFunctionInfo(&info);
+     if (extension == NULL && !result.is_null()) {
+@@ -543,7 +545,8 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
+ Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
+                                                  Handle<Context> context,
+                                                  bool is_global,
+-                                                 StrictModeFlag strict_mode) {
++                                                 StrictModeFlag strict_mode,
++                                                 bool qml_mode) {
+   Isolate* isolate = source->GetIsolate();
+   int source_length = source->length();
+   isolate->counters()->total_eval_size()->Increment(source_length);
+@@ -567,6 +570,7 @@ Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
+     CompilationInfo info(script);
+     info.MarkAsEval();
+     if (is_global) info.MarkAsGlobal();
++    if (qml_mode) info.MarkAsQmlMode();
+     if (strict_mode == kStrictMode) info.MarkAsStrictMode();
+     info.SetCallingContext(context);
+     result = MakeFunctionInfo(&info);
+@@ -610,6 +614,12 @@ bool Compiler::CompileLazy(CompilationInfo* info) {
+       info->MarkAsStrictMode();
+     }
+
++    // After parsing we know function's qml mode. Remember it.
++    if (info->function()->qml_mode()) {
++      shared->set_qml_mode(true);
++      info->MarkAsQmlMode();
++    }
++
+     // Compile the code.
+     if (!MakeCode(info)) {
+       if (!isolate->has_pending_exception()) {
+@@ -755,6 +765,7 @@ void Compiler::SetFunctionInfo(Handle<SharedFunctionInfo> function_info,
+       *lit->this_property_assignments());
+   function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
+   function_info->set_strict_mode(lit->strict_mode());
++  function_info->set_qml_mode(lit->qml_mode());
+ }
+
+
+diff --git a/src/compiler.h b/src/compiler.h
+index e75e869..17cd369 100644
+--- a/src/compiler.h
++++ b/src/compiler.h
+@@ -54,6 +54,7 @@ class CompilationInfo BASE_EMBEDDED {
+   bool is_global() const { return (flags_ & IsGlobal::mask()) != 0; }
+   bool is_strict_mode() const { return (flags_ & IsStrictMode::mask()) != 0; }
+   bool is_in_loop() const { return (flags_ & IsInLoop::mask()) != 0; }
++  bool is_qml_mode() const { return (flags_ & IsQmlMode::mask()) != 0; }
+   FunctionLiteral* function() const { return function_; }
+   Scope* scope() const { return scope_; }
+   Handle<Code> code() const { return code_; }
+@@ -83,6 +84,9 @@ class CompilationInfo BASE_EMBEDDED {
+     ASSERT(is_lazy());
+     flags_ |= IsInLoop::encode(true);
+   }
++  void MarkAsQmlMode() {
++    flags_ |= IsQmlMode::encode(true);
++  }
+   void MarkAsAllowingNativesSyntax() {
+     flags_ |= IsNativesSyntaxAllowed::encode(true);
+   }
+@@ -141,6 +145,7 @@ class CompilationInfo BASE_EMBEDDED {
+
+   // Determine whether or not we can adaptively optimize.
+   bool AllowOptimize() {
++    // XXX - fix qml mode optimizations
+     return V8::UseCrankshaft() && !closure_.is_null();
+   }
+
+@@ -163,8 +168,13 @@ class CompilationInfo BASE_EMBEDDED {
+
+   void Initialize(Mode mode) {
+     mode_ = V8::UseCrankshaft() ? mode : NONOPT;
+-    if (!shared_info_.is_null() && shared_info_->strict_mode()) {
+-      MarkAsStrictMode();
++    if (!shared_info_.is_null()) {
++      if (shared_info_->strict_mode()) {
++        MarkAsStrictMode();
++      }
++      if (shared_info_->qml_mode()) {
++        MarkAsQmlMode();
++      }
+     }
+   }
+
+@@ -187,6 +197,8 @@ class CompilationInfo BASE_EMBEDDED {
+   class IsStrictMode: public BitField<bool, 4, 1> {};
+   // Native syntax (%-stuff) allowed?
+   class IsNativesSyntaxAllowed: public BitField<bool, 5, 1> {};
++  // Qml mode
++  class IsQmlMode: public BitField<bool, 6, 1> {};
+
+   unsigned flags_;
+
+@@ -252,13 +264,15 @@ class Compiler : public AllStatic {
+                                             v8::Extension* extension,
+                                             ScriptDataImpl* pre_data,
+                                             Handle<Object> script_data,
+-                                            NativesFlag is_natives_code);
++                                            NativesFlag is_natives_code,
++                                            v8::Script::CompileFlags compile_flags = v8::Script::Default);
+
+   // Compile a String source within a context for Eval.
+   static Handle<SharedFunctionInfo> CompileEval(Handle<String> source,
+                                                 Handle<Context> context,
+                                                 bool is_global,
+-                                                StrictModeFlag strict_mode);
++                                                StrictModeFlag strict_mode,
++                                                bool qml_mode);
+
+   // Compile from function info (used for lazy compilation). Returns true on
+   // success and false if the compilation resulted in a stack overflow.
+diff --git a/src/contexts.cc b/src/contexts.cc
+index 520f3dd..da5cacb 100644
+--- a/src/contexts.cc
++++ b/src/contexts.cc
+@@ -89,6 +89,8 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
+     PrintF(")\n");
+   }
+
++  Handle<JSObject> qml_global;
++
+   do {
+     if (FLAG_trace_contexts) {
+       PrintF(" - looking in context %p", reinterpret_cast<void*>(*context));
+@@ -119,6 +121,10 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
+       }
+     }
+
++    if (qml_global.is_null() && !context->qml_global()->IsUndefined()) {
++      qml_global = Handle<JSObject>(context->qml_global(), isolate);
++    }
++
+     if (context->is_function_context()) {
+       // we have context-local slots
+
+@@ -198,6 +204,23 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
+     }
+   } while (follow_context_chain);
+
++  if (!qml_global.is_null()) {
++    if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0) {
++      *attributes = qml_global->GetLocalPropertyAttribute(*name);
++    } else {
++      *attributes = qml_global->GetPropertyAttribute(*name);
++    }
++
++    if (*attributes != ABSENT) {
++      // property found
++      if (FLAG_trace_contexts) {
++        PrintF("=> found property in qml global object %p\n",
++               reinterpret_cast<void*>(*qml_global));
++      }
++      return qml_global;
++    }
++  }
++
+   // slot not found
+   if (FLAG_trace_contexts) {
+     PrintF("=> no property/slot found\n");
+diff --git a/src/contexts.h b/src/contexts.h
+index e46619e..57d8e7b 100644
+--- a/src/contexts.h
++++ b/src/contexts.h
+@@ -182,6 +182,7 @@ class Context: public FixedArray {
+     FCONTEXT_INDEX,
+     PREVIOUS_INDEX,
+     EXTENSION_INDEX,
++    QML_GLOBAL_INDEX,
+     GLOBAL_INDEX,
+     MIN_CONTEXT_SLOTS,
+
+@@ -273,6 +274,9 @@ class Context: public FixedArray {
+   }
+   void set_global(GlobalObject* global) { set(GLOBAL_INDEX, global); }
+
++  JSObject *qml_global() { return reinterpret_cast<JSObject *>(get(QML_GLOBAL_INDEX)); }
++  void set_qml_global(JSObject *qml_global) { set(QML_GLOBAL_INDEX, qml_global); }
++
+   // Returns a JSGlobalProxy object or null.
+   JSObject* global_proxy();
+   void set_global_proxy(JSObject* global);
+diff --git a/src/execution.cc b/src/execution.cc
+index eb26438..1632076 100644
+--- a/src/execution.cc
++++ b/src/execution.cc
+@@ -70,7 +70,8 @@ static Handle<Object> Invoke(bool construct,
+                              Handle<Object> receiver,
+                              int argc,
+                              Object*** args,
+-                             bool* has_pending_exception) {
++                             bool* has_pending_exception,
++                             Handle<Object> qml) {
+   Isolate* isolate = func->GetIsolate();
+
+   // Entering JavaScript.
+@@ -107,6 +108,12 @@ static Handle<Object> Invoke(bool construct,
+   // make the current one is indeed a global object.
+   ASSERT(func->context()->global()->IsGlobalObject());
+
++  Handle<JSObject> oldqml;
++  if (!qml.is_null()) {
++    oldqml = Handle<JSObject>(func->context()->qml_global());
++    func->context()->set_qml_global(JSObject::cast(*qml));
++  }
++
+   {
+     // Save and restore context around invocation and block the
+     // allocation of handles without explicit handle scopes.
+@@ -122,6 +129,9 @@ static Handle<Object> Invoke(bool construct,
+                                 receiver_pointer, argc, args);
+   }
+
++  if (!qml.is_null())
++    func->context()->set_qml_global(*oldqml);
++
+ #ifdef DEBUG
+   value->Verify();
+ #endif
+@@ -150,14 +160,24 @@ Handle<Object> Execution::Call(Handle<JSFunction> func,
+                                int argc,
+                                Object*** args,
+                                bool* pending_exception) {
+-  return Invoke(false, func, receiver, argc, args, pending_exception);
++  return Invoke(false, func, receiver, argc, args, pending_exception, Handle<Object>());
++}
++
++
++Handle<Object> Execution::Call(Handle<JSFunction> func,
++                               Handle<Object> receiver,
++                               int argc,
++                               Object*** args,
++                               bool* pending_exception,
++                               Handle<Object> qml) {
++  return Invoke(false, func, receiver, argc, args, pending_exception, qml);
+ }
+
+
+ Handle<Object> Execution::New(Handle<JSFunction> func, int argc,
+                               Object*** args, bool* pending_exception) {
+   return Invoke(true, func, Isolate::Current()->global(), argc, args,
+-                pending_exception);
++                pending_exception, Handle<Object>());
+ }
+
+
+@@ -175,7 +195,7 @@ Handle<Object> Execution::TryCall(Handle<JSFunction> func,
+   catcher.SetCaptureMessage(false);
+
+   Handle<Object> result = Invoke(false, func, receiver, argc, args,
+-                                 caught_exception);
++                                 caught_exception, Handle<Object>());
+
+   if (*caught_exception) {
+     ASSERT(catcher.HasCaught());
+diff --git a/src/execution.h b/src/execution.h
+index d4b80d2..a476eb4 100644
+--- a/src/execution.h
++++ b/src/execution.h
+@@ -56,6 +56,12 @@ class Execution : public AllStatic {
+                              int argc,
+                              Object*** args,
+                              bool* pending_exception);
++  static Handle<Object> Call(Handle<JSFunction> func,
++                             Handle<Object> receiver,
++                             int argc,
++                             Object*** args,
++                             bool* pending_exception,
++                             Handle<Object> qml);
+
+   // Construct object from function, the caller supplies an array of
+   // arguments. Arguments are Object* type. After function returns,
+diff --git a/src/full-codegen.cc b/src/full-codegen.cc
+index d6ba56e..2eaef0f 100644
+--- a/src/full-codegen.cc
++++ b/src/full-codegen.cc
+@@ -542,7 +542,7 @@ void FullCodeGenerator::VisitDeclarations(
+   // Do nothing in case of no declared global functions or variables.
+   if (globals > 0) {
+     Handle<FixedArray> array =
+-        isolate()->factory()->NewFixedArray(2 * globals, TENURED);
++        isolate()->factory()->NewFixedArray(3 * globals, TENURED);
+     for (int j = 0, i = 0; i < length; i++) {
+       Declaration* decl = declarations->at(i);
+       Variable* var = decl->proxy()->var();
+@@ -567,6 +567,7 @@ void FullCodeGenerator::VisitDeclarations(
+           }
+           array->set(j++, *function);
+         }
++        array->set(j++, Smi::FromInt(var->is_qml_global()));
+       }
+     }
+     // Invoke the platform-dependent code generator to do the actual
+diff --git a/src/full-codegen.h b/src/full-codegen.h
+index d6ed1b9..e3241aa 100644
+--- a/src/full-codegen.h
++++ b/src/full-codegen.h
+@@ -505,6 +505,7 @@ class FullCodeGenerator: public AstVisitor {
+   StrictModeFlag strict_mode_flag() {
+     return is_strict_mode() ? kStrictMode : kNonStrictMode;
+   }
++  bool is_qml_mode() { return function()->qml_mode(); }
+   FunctionLiteral* function() { return info_->function(); }
+   Scope* scope() { return info_->scope(); }
+
+diff --git a/src/heap.cc b/src/heap.cc
+index bf2940e..da958c2 100644
+--- a/src/heap.cc
++++ b/src/heap.cc
+@@ -3795,6 +3795,7 @@ MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) {
+   context->set_previous(NULL);
+   context->set_extension(NULL);
+   context->set_global(function->context()->global());
++  context->set_qml_global(function->context()->qml_global());
+   ASSERT(!context->IsGlobalContext());
+   ASSERT(context->is_function_context());
+   ASSERT(result->IsContext());
+@@ -3817,6 +3818,7 @@ MaybeObject* Heap::AllocateWithContext(Context* previous,
+   context->set_previous(previous);
+   context->set_extension(extension);
+   context->set_global(previous->global());
++  context->set_qml_global(previous->qml_global());
+   ASSERT(!context->IsGlobalContext());
+   ASSERT(!context->is_function_context());
+   ASSERT(result->IsContext());
+diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
+index a623775..52455bc 100644
+--- a/src/hydrogen-instructions.h
++++ b/src/hydrogen-instructions.h
+@@ -1148,7 +1148,7 @@ class HOuterContext: public HUnaryOperation {
+
+ class HGlobalObject: public HUnaryOperation {
+  public:
+-  explicit HGlobalObject(HValue* context) : HUnaryOperation(context) {
++  explicit HGlobalObject(HValue* context) : HUnaryOperation(context), qml_global_(false) {
+     set_representation(Representation::Tagged());
+     SetFlag(kUseGVN);
+   }
+@@ -1159,8 +1159,14 @@ class HGlobalObject: public HUnaryOperation {
+     return Representation::Tagged();
+   }
+
++  bool qml_global() { return qml_global_; }
++  void set_qml_global(bool v) { qml_global_ = v; }
++
+  protected:
+   virtual bool DataEquals(HValue* other) { return true; }
++
++ private:
++  bool qml_global_;
+ };
+
+
+@@ -1177,7 +1183,7 @@ class HGlobalReceiver: public HUnaryOperation {
+   virtual Representation RequiredInputRepresentation(int index) const {
+     return Representation::Tagged();
+   }
+-
++
+  protected:
+   virtual bool DataEquals(HValue* other) { return true; }
+ };
+diff --git a/src/hydrogen.cc b/src/hydrogen.cc
+index 73ea97d..d17e304 100644
+--- a/src/hydrogen.cc
++++ b/src/hydrogen.cc
+@@ -2918,6 +2918,7 @@ void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
+       HContext* context = new(zone()) HContext;
+       AddInstruction(context);
+       HGlobalObject* global_object = new(zone()) HGlobalObject(context);
++      if (variable->is_qml_global()) global_object->set_qml_global(true);
+       AddInstruction(global_object);
+       HLoadGlobalGeneric* instr =
+           new(zone()) HLoadGlobalGeneric(context,
+@@ -3307,6 +3308,7 @@ void HGraphBuilder::HandleGlobalVariableAssignment(Variable* var,
+     HContext* context = new(zone()) HContext;
+     AddInstruction(context);
+     HGlobalObject* global_object = new(zone()) HGlobalObject(context);
++    if (var->is_qml_global()) global_object->set_qml_global(true);
+     AddInstruction(global_object);
+     HStoreGlobalGeneric* instr =
+         new(zone()) HStoreGlobalGeneric(context,
+diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
+index 5d32095..afa599e 100644
+--- a/src/ia32/code-stubs-ia32.cc
++++ b/src/ia32/code-stubs-ia32.cc
+@@ -147,6 +147,13 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
+   __ mov(ebx, Operand(ebx, Context::SlotOffset(Context::GLOBAL_INDEX)));
+   __ mov(Operand(eax, Context::SlotOffset(Context::GLOBAL_INDEX)), ebx);
+
++  // Copy the qml global object from the surrounding context. We go through the
++  // context in the function (ecx) to match the allocation behavior we have
++  // in the runtime system (see Heap::AllocateFunctionContext).
++  __ mov(ebx, FieldOperand(ecx, JSFunction::kContextOffset));
++  __ mov(ebx, Operand(ebx, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
++  __ mov(Operand(eax, Context::SlotOffset(Context::QML_GLOBAL_INDEX)), ebx);
++
+   // Initialize the rest of the slots to undefined.
+   __ mov(ebx, factory->undefined_value());
+   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
+diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
+index 5d153a8..0ddcde2 100644
+--- a/src/ia32/full-codegen-ia32.cc
++++ b/src/ia32/full-codegen-ia32.cc
+@@ -142,12 +142,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment cmnt(masm_, "[ Allocate local context");
+     // Argument to NewContext is the function, which is still in edi.
+     __ push(edi);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -1107,10 +1108,10 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
+
+   // All extension objects were empty and it is safe to use a global
+   // load IC call.
+-  __ mov(eax, GlobalObjectOperand());
++  __ mov(eax, slot->var()->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+   __ mov(ecx, slot->var()->name());
+   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+-  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
++  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
+       ? RelocInfo::CODE_TARGET
+       : RelocInfo::CODE_TARGET_CONTEXT;
+   EmitCallIC(ic, mode);
+@@ -1214,10 +1215,10 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
+     Comment cmnt(masm_, "Global variable");
+     // Use inline caching. Variable name is passed in ecx and the global
+     // object on the stack.
+-    __ mov(eax, GlobalObjectOperand());
++    __ mov(eax, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+     __ mov(ecx, var->name());
+     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+     context()->Plug(eax);
+
+   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
+@@ -1837,11 +1838,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
+     // assignment.  Right-hand-side value is passed in eax, variable name in
+     // ecx, and the global object on the stack.
+     __ mov(ecx, var->name());
+-    __ mov(edx, GlobalObjectOperand());
++    __ mov(edx, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+     Handle<Code> ic = is_strict_mode()
+         ? isolate()->builtins()->StoreIC_Initialize_Strict()
+         : isolate()->builtins()->StoreIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+
+   } else if (op == Token::INIT_CONST) {
+     // Like var declarations, const declarations are hoisted to function
+@@ -2113,9 +2114,12 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+   // Push the strict mode flag.
+   __ push(Immediate(Smi::FromInt(strict_mode_flag())));
+
++  // Push the qml mode flag
++  __ push(Immediate(Smi::FromInt(is_qml_mode())));
++
+   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
+-                 : Runtime::kResolvePossiblyDirectEval, 4);
++                 : Runtime::kResolvePossiblyDirectEval, 5);
+ }
+
+
+@@ -2188,8 +2192,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
+     context()->DropAndPlug(1, eax);
+   } else if (var != NULL && !var->is_this() && var->is_global()) {
+     // Push global object as receiver for the call IC.
+-    __ push(GlobalObjectOperand());
+-    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
++    __ push(var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
++    EmitCallWithIC(expr, var->name(), var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
+   } else if (var != NULL && var->AsSlot() != NULL &&
+              var->AsSlot()->type() == Slot::LOOKUP) {
+     // Call to a lookup slot (dynamically introduced variable).
+diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
+index 0f96f78..c1da075 100644
+--- a/src/ia32/lithium-codegen-ia32.cc
++++ b/src/ia32/lithium-codegen-ia32.cc
+@@ -159,12 +159,13 @@ bool LCodeGen::GeneratePrologue() {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment(";;; Allocate local context");
+     // Argument to NewContext is the function, which is still in edi.
+     __ push(edi);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -2525,7 +2526,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
+ void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
+   Register context = ToRegister(instr->context());
+   Register result = ToRegister(instr->result());
+-  __ mov(result, Operand(context, Context::SlotOffset(Context::GLOBAL_INDEX)));
++  __ mov(result, Operand(context, Context::SlotOffset(instr->qml_global()?Context::QML_GLOBAL_INDEX:Context::GLOBAL_INDEX)));
+ }
+
+
+diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
+index 9ccd189..8e98b73 100644
+--- a/src/ia32/lithium-ia32.cc
++++ b/src/ia32/lithium-ia32.cc
+@@ -1205,7 +1205,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
+
+ LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
+   LOperand* context = UseRegisterAtStart(instr->value());
+-  return DefineAsRegister(new LGlobalObject(context));
++  return DefineAsRegister(new LGlobalObject(context, instr->qml_global()));
+ }
+
+
+diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
+index 9ace8f8..95ed001 100644
+--- a/src/ia32/lithium-ia32.h
++++ b/src/ia32/lithium-ia32.h
+@@ -1416,13 +1416,17 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
+
+ class LGlobalObject: public LTemplateInstruction<1, 1, 0> {
+  public:
+-  explicit LGlobalObject(LOperand* context) {
++  explicit LGlobalObject(LOperand* context, bool qml_global) {
+     inputs_[0] = context;
++    qml_global_ = qml_global;
+   }
+
+   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
+
+   LOperand* context() { return InputAt(0); }
++  bool qml_global() { return qml_global_; }
++ private:
++  bool qml_global_;
+ };
+
+
+diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
+index b986264..f8479ae 100644
+--- a/src/ia32/macro-assembler-ia32.h
++++ b/src/ia32/macro-assembler-ia32.h
+@@ -778,6 +778,11 @@ static inline Operand GlobalObjectOperand() {
+ }
+
+
++static inline Operand QmlGlobalObjectOperand() {
++  return ContextOperand(esi, Context::QML_GLOBAL_INDEX);
++}
++
++
+ // Generates an Operand for saving parameters after PrepareCallApiFunction.
+ Operand ApiParameterOperand(int index);
+
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index 231b835..1c7f83e 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -3242,6 +3242,18 @@ void SharedFunctionInfo::set_strict_mode(bool value) {
+ }
+
+
++bool SharedFunctionInfo::qml_mode() {
++  return BooleanBit::get(compiler_hints(), kQmlModeFunction);
++}
++
++
++void SharedFunctionInfo::set_qml_mode(bool value) {
++  set_compiler_hints(BooleanBit::set(compiler_hints(),
++                                     kQmlModeFunction,
++                                     value));
++}
++
++
+ ACCESSORS(CodeCache, default_cache, FixedArray, kDefaultCacheOffset)
+ ACCESSORS(CodeCache, normal_type_cache, Object, kNormalTypeCacheOffset)
+
+diff --git a/src/objects.h b/src/objects.h
+index 1bdb5c7..edbc47a 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -4331,6 +4331,10 @@ class SharedFunctionInfo: public HeapObject {
+   inline bool strict_mode();
+   inline void set_strict_mode(bool value);
+
++  // Indicates whether the function is a qml mode function
++  inline bool qml_mode();
++  inline void set_qml_mode(bool value);
++
+   // Indicates whether or not the code in the shared function support
+   // deoptimization.
+   inline bool has_deoptimization_support();
+@@ -4511,6 +4515,7 @@ class SharedFunctionInfo: public HeapObject {
+   static const int kCodeAgeMask = 0x7;
+   static const int kOptimizationDisabled = 6;
+   static const int kStrictModeFunction = 7;
++  static const int kQmlModeFunction = 8;
+
+  private:
+ #if V8_HOST_ARCH_32_BIT
+diff --git a/src/parser.cc b/src/parser.cc
+index a84ec6f..7f5c361 100644
+--- a/src/parser.cc
++++ b/src/parser.cc
+@@ -593,7 +593,8 @@ Parser::Parser(Handle<Script> script,
+
+ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
+                                       bool in_global_context,
+-                                      StrictModeFlag strict_mode) {
++                                      StrictModeFlag strict_mode,
++                                      bool qml_mode) {
+   CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT);
+
+   HistogramTimerScope timer(isolate()->counters()->parse());
+@@ -609,11 +610,11 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
+     ExternalTwoByteStringUC16CharacterStream stream(
+         Handle<ExternalTwoByteString>::cast(source), 0, source->length());
+     scanner_.Initialize(&stream);
+-    return DoParseProgram(source, in_global_context, strict_mode, &zone_scope);
++    return DoParseProgram(source, in_global_context, strict_mode, qml_mode, &zone_scope);
+   } else {
+     GenericStringUC16CharacterStream stream(source, 0, source->length());
+     scanner_.Initialize(&stream);
+-    return DoParseProgram(source, in_global_context, strict_mode, &zone_scope);
++    return DoParseProgram(source, in_global_context, strict_mode, qml_mode, &zone_scope);
+   }
+ }
+
+@@ -621,6 +622,7 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
+ FunctionLiteral* Parser::DoParseProgram(Handle<String> source,
+                                         bool in_global_context,
+                                         StrictModeFlag strict_mode,
++                                        bool qml_mode,
+                                         ZoneScope* zone_scope) {
+   ASSERT(target_stack_ == NULL);
+   if (pre_data_ != NULL) pre_data_->Initialize();
+@@ -641,6 +643,9 @@ FunctionLiteral* Parser::DoParseProgram(Handle<String> source,
+     if (strict_mode == kStrictMode) {
+       top_scope_->EnableStrictMode();
+     }
++    if (qml_mode) {
++      scope->EnableQmlMode();
++    }
+     ZoneList<Statement*>* body = new ZoneList<Statement*>(16);
+     bool ok = true;
+     int beg_loc = scanner().location().beg_pos;
+@@ -729,6 +734,9 @@ FunctionLiteral* Parser::ParseLazy(CompilationInfo* info,
+     if (shared_info->strict_mode()) {
+       top_scope_->EnableStrictMode();
+     }
++    if (shared_info->qml_mode()) {
++      top_scope_->EnableQmlMode();
++    }
+
+     FunctionLiteralType type =
+         shared_info->is_expression() ? EXPRESSION : DECLARATION;
+@@ -1661,6 +1669,11 @@ Block* Parser::ParseVariableDeclarations(bool accept_IN,
+         arguments->Add(value);
+         value = NULL;  // zap the value to avoid the unnecessary assignment
+
++        int qml_mode = 0;
++        if (top_scope_->is_qml_mode() && !Isolate::Current()->global()->HasProperty(*name))
++          qml_mode = 1;
++        arguments->Add(NewNumberLiteral(qml_mode));
++
+         // Construct the call to Runtime_InitializeConstGlobal
+         // and add it to the initialization statement block.
+         // Note that the function does different things depending on
+@@ -1676,6 +1689,11 @@ Block* Parser::ParseVariableDeclarations(bool accept_IN,
+         arguments->Add(NewNumberLiteral(
+             top_scope_->is_strict_mode() ? kStrictMode : kNonStrictMode));
+
++        int qml_mode = 0;
++        if (top_scope_->is_qml_mode() && !Isolate::Current()->global()->HasProperty(*name))
++          qml_mode = 1;
++        arguments->Add(NewNumberLiteral(qml_mode));
++
+         // Be careful not to assign a value to the global variable if
+         // we're in a with. The initialization value should not
+         // necessarily be stored in the global object in that case,
+@@ -5157,7 +5175,8 @@ bool ParserApi::Parse(CompilationInfo* info) {
+       Handle<String> source = Handle<String>(String::cast(script->source()));
+       result = parser.ParseProgram(source,
+                                    info->is_global(),
+-                                   info->StrictMode());
++                                   info->StrictMode(),
++                                   info->is_qml_mode());
+     }
+   }
+
+diff --git a/src/parser.h b/src/parser.h
+index 64f1303..4d45e45 100644
+--- a/src/parser.h
++++ b/src/parser.h
+@@ -431,7 +431,8 @@ class Parser {
+   // Returns NULL if parsing failed.
+   FunctionLiteral* ParseProgram(Handle<String> source,
+                                 bool in_global_context,
+-                                StrictModeFlag strict_mode);
++                                StrictModeFlag strict_mode,
++                                bool qml_mode);
+
+   FunctionLiteral* ParseLazy(CompilationInfo* info);
+
+@@ -464,6 +465,7 @@ class Parser {
+   FunctionLiteral* DoParseProgram(Handle<String> source,
+                                   bool in_global_context,
+                                   StrictModeFlag strict_mode,
++                                  bool qml_mode,
+                                   ZoneScope* zone_scope);
+
+   // Report syntax error
+diff --git a/src/prettyprinter.cc b/src/prettyprinter.cc
+index c777ab4..1964e02 100644
+--- a/src/prettyprinter.cc
++++ b/src/prettyprinter.cc
+@@ -656,6 +656,9 @@ void AstPrinter::PrintLiteralWithModeIndented(const char* info,
+     EmbeddedVector<char, 256> buf;
+     int pos = OS::SNPrintF(buf, "%s (mode = %s", info,
+                            Variable::Mode2String(var->mode()));
++    if (var->is_qml_global()) {
++      pos += OS::SNPrintF(buf + pos, ":QML");
++    }
+     OS::SNPrintF(buf + pos, ")");
+     PrintLiteralIndented(buf.start(), value, true);
+   }
+diff --git a/src/runtime.cc b/src/runtime.cc
+index 660352c..827d954 100644
+--- a/src/runtime.cc
++++ b/src/runtime.cc
+@@ -1065,8 +1065,6 @@ static Failure* ThrowRedeclarationError(Isolate* isolate,
+ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+   ASSERT(args.length() == 4);
+   HandleScope scope(isolate);
+-  Handle<GlobalObject> global = Handle<GlobalObject>(
+-      isolate->context()->global());
+
+   Handle<Context> context = args.at<Context>(0);
+   CONVERT_ARG_CHECKED(FixedArray, pairs, 1);
+@@ -1075,6 +1073,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+       static_cast<StrictModeFlag>(Smi::cast(args[3])->value());
+   ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
+
++  Handle<JSObject> js_global = Handle<JSObject>(isolate->context()->global());
++  Handle<JSObject> qml_global = Handle<JSObject>(isolate->context()->qml_global());
++
+   // Compute the property attributes. According to ECMA-262, section
+   // 13, page 71, the property must be read-only and
+   // non-deletable. However, neither SpiderMonkey nor KJS creates the
+@@ -1083,10 +1084,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
+
+   // Traverse the name/value pairs and set the properties.
+   int length = pairs->length();
+-  for (int i = 0; i < length; i += 2) {
++  for (int i = 0; i < length; i += 3) {
+     HandleScope scope(isolate);
+     Handle<String> name(String::cast(pairs->get(i)));
+     Handle<Object> value(pairs->get(i + 1), isolate);
++    Handle<Smi> is_qml_global(Smi::cast(pairs->get(i + 2)));
++
++    Handle<JSObject> global = is_qml_global->value()?qml_global:js_global;
+
+     // We have to declare a global const property. To capture we only
+     // assign to it when evaluating the assignment for "const x =
+@@ -1316,20 +1320,25 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+   NoHandleAllocation nha;
+   // args[0] == name
+   // args[1] == strict_mode
+-  // args[2] == value (optional)
++  // args[2] == qml_mode
++  // args[3] == value (optional)
+
+   // Determine if we need to assign to the variable if it already
+   // exists (based on the number of arguments).
+-  RUNTIME_ASSERT(args.length() == 2 || args.length() == 3);
+-  bool assign = args.length() == 3;
++  RUNTIME_ASSERT(args.length() == 3 || args.length() == 4);
++  bool assign = args.length() == 4;
+
+   CONVERT_ARG_CHECKED(String, name, 0);
+-  GlobalObject* global = isolate->context()->global();
+   RUNTIME_ASSERT(args[1]->IsSmi());
+   StrictModeFlag strict_mode =
+       static_cast<StrictModeFlag>(Smi::cast(args[1])->value());
+   ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
+
++  RUNTIME_ASSERT(args[2]->IsSmi());
++  int qml_mode = Smi::cast(args[2])->value();
++
++  JSObject* global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
++
+   // According to ECMA-262, section 12.2, page 62, the property must
+   // not be deletable.
+   PropertyAttributes attributes = DONT_DELETE;
+@@ -1350,7 +1359,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+       if (lookup.IsReadOnly()) {
+         // If we found readonly property on one of hidden prototypes,
+         // just shadow it.
+-        if (real_holder != isolate->context()->global()) break;
++        if (real_holder != global) break;
+         return ThrowRedeclarationError(isolate, "const", name);
+       }
+
+@@ -1372,7 +1381,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+           // overwrite it with a variable declaration we must throw a
+           // re-declaration error.  However if we found readonly property
+           // on one of hidden prototypes, just shadow it.
+-          if (real_holder != isolate->context()->global()) break;
++          if (real_holder != global) break;
+           return ThrowRedeclarationError(isolate, "const", name);
+         }
+       }
+@@ -1384,7 +1393,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+       }
+
+       // Assign the value (or undefined) to the property.
+-      Object* value = (assign) ? args[2] : isolate->heap()->undefined_value();
++      Object* value = (assign) ? args[3] : isolate->heap()->undefined_value();
+       return real_holder->SetProperty(
+           &lookup, *name, value, attributes, strict_mode);
+     }
+@@ -1399,9 +1408,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
+     real_holder = JSObject::cast(proto);
+   }
+
+-  global = isolate->context()->global();
++  global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
+   if (assign) {
+-    return global->SetProperty(*name, args[2], attributes, strict_mode, true);
++    return global->SetProperty(*name, args[3], attributes, strict_mode, true);
+   }
+   return isolate->heap()->undefined_value();
+ }
+@@ -1411,12 +1420,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
+   // All constants are declared with an initial value. The name
+   // of the constant is the first argument and the initial value
+   // is the second.
+-  RUNTIME_ASSERT(args.length() == 2);
++  RUNTIME_ASSERT(args.length() == 3);
+   CONVERT_ARG_CHECKED(String, name, 0);
+   Handle<Object> value = args.at<Object>(1);
+
++  RUNTIME_ASSERT(args[2]->IsSmi());
++  int qml_mode = Smi::cast(args[2])->value();
++
+   // Get the current global object from top.
+-  GlobalObject* global = isolate->context()->global();
++  JSObject* global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
+
+   // According to ECMA-262, section 12.2, page 62, the property must
+   // not be deletable. Since it's a const, it must be READ_ONLY too.
+@@ -1456,7 +1468,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
+     // with setting the value because the property is either absent or
+     // read-only. We also have to do redo the lookup.
+     HandleScope handle_scope(isolate);
+-    Handle<GlobalObject> global(isolate->context()->global());
++    Handle<JSObject> global(qml_mode?isolate->context()->qml_global():isolate->context()->global());
+
+     // BUG 1213575: Handle the case where we have to set a read-only
+     // property through an interceptor and only do it if it's
+@@ -8160,7 +8172,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
+   Handle<SharedFunctionInfo> shared = Compiler::CompileEval(source,
+                                                             context,
+                                                             true,
+-                                                            kNonStrictMode);
++                                                            kNonStrictMode,
++                                                            false);
+   if (shared.is_null()) return Failure::Exception();
+   Handle<JSFunction> fun =
+       isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
+@@ -8173,14 +8186,16 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
+ static ObjectPair CompileGlobalEval(Isolate* isolate,
+                                     Handle<String> source,
+                                     Handle<Object> receiver,
+-                                    StrictModeFlag strict_mode) {
++                                    StrictModeFlag strict_mode,
++                                    bool qml_mode) {
+   // Deal with a normal eval call with a string argument. Compile it
+   // and return the compiled function bound in the local context.
+   Handle<SharedFunctionInfo> shared = Compiler::CompileEval(
+       source,
+       Handle<Context>(isolate->context()),
+       isolate->context()->IsGlobalContext(),
+-      strict_mode);
++      strict_mode,
++      qml_mode);
+   if (shared.is_null()) return MakePair(Failure::Exception(), NULL);
+   Handle<JSFunction> compiled =
+       isolate->factory()->NewFunctionFromSharedFunctionInfo(
+@@ -8190,7 +8205,7 @@ static ObjectPair CompileGlobalEval(Isolate* isolate,
+
+
+ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
+-  ASSERT(args.length() == 4);
++  ASSERT(args.length() == 5);
+
+   HandleScope scope(isolate);
+   Handle<Object> callee = args.at<Object>(0);
+@@ -8257,16 +8272,18 @@ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
+   }
+
+   ASSERT(args[3]->IsSmi());
++  ASSERT(args[4]->IsSmi());
+   return CompileGlobalEval(isolate,
+                            args.at<String>(1),
+                            args.at<Object>(2),
+                            static_cast<StrictModeFlag>(
+-                                Smi::cast(args[3])->value()));
++                                Smi::cast(args[3])->value()),
++                           Smi::cast(args[4])->value());
+ }
+
+
+ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEvalNoLookup) {
+-  ASSERT(args.length() == 4);
++  ASSERT(args.length() == 5);
+
+   HandleScope scope(isolate);
+   Handle<Object> callee = args.at<Object>(0);
+@@ -8280,11 +8297,13 @@ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEvalNoLookup) {
+   }
+
+   ASSERT(args[3]->IsSmi());
++  ASSERT(args[4]->IsSmi());
+   return CompileGlobalEval(isolate,
+                            args.at<String>(1),
+                            args.at<Object>(2),
+                            static_cast<StrictModeFlag>(
+-                                Smi::cast(args[3])->value()));
++                                Smi::cast(args[3])->value()),
++                           Smi::cast(args[4])->value());
+ }
+
+
+@@ -10633,7 +10652,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
+       Compiler::CompileEval(function_source,
+                             context,
+                             context->IsGlobalContext(),
+-                            kNonStrictMode);
++                            kNonStrictMode,
++                            false);
+   if (shared.is_null()) return Failure::Exception();
+   Handle<JSFunction> compiled_function =
+       isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context);
+@@ -10722,7 +10742,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluateGlobal) {
+   // Currently, the eval code will be executed in non-strict mode,
+   // even in the strict code context.
+   Handle<SharedFunctionInfo> shared =
+-      Compiler::CompileEval(source, context, is_global, kNonStrictMode);
++      Compiler::CompileEval(source, context, is_global, kNonStrictMode, false);
+   if (shared.is_null()) return Failure::Exception();
+   Handle<JSFunction> compiled_function =
+       Handle<JSFunction>(
+diff --git a/src/runtime.h b/src/runtime.h
+index bf1ba68..5e97173 100644
+--- a/src/runtime.h
++++ b/src/runtime.h
+@@ -241,8 +241,8 @@ namespace internal {
+   \
+   /* Eval */ \
+   F(GlobalReceiver, 1, 1) \
+-  F(ResolvePossiblyDirectEval, 4, 2) \
+-  F(ResolvePossiblyDirectEvalNoLookup, 4, 2) \
++  F(ResolvePossiblyDirectEval, 5, 2) \
++  F(ResolvePossiblyDirectEvalNoLookup, 5, 2) \
+   \
+   F(SetProperty, -1 /* 4 or 5 */, 1) \
+   F(DefineOrRedefineDataProperty, 4, 1) \
+@@ -296,8 +296,8 @@ namespace internal {
+   /* Declarations and initialization */ \
+   F(DeclareGlobals, 4, 1) \
+   F(DeclareContextSlot, 4, 1) \
+-  F(InitializeVarGlobal, -1 /* 2 or 3 */, 1) \
+-  F(InitializeConstGlobal, 2, 1) \
++  F(InitializeVarGlobal, -1 /* 3 or 4 */, 1) \
++  F(InitializeConstGlobal, 3, 1) \
+   F(InitializeConstContextSlot, 3, 1) \
+   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
+   \
+diff --git a/src/scopes.cc b/src/scopes.cc
+index 8df93c5..734a217 100644
+--- a/src/scopes.cc
++++ b/src/scopes.cc
+@@ -198,6 +198,7 @@ void Scope::SetDefaults(Type type,
+   scope_calls_eval_ = false;
+   // Inherit the strict mode from the parent scope.
+   strict_mode_ = (outer_scope != NULL) && outer_scope->strict_mode_;
++  qml_mode_ = (outer_scope != NULL) && outer_scope->qml_mode_;
+   outer_scope_calls_eval_ = false;
+   inner_scope_calls_eval_ = false;
+   outer_scope_is_eval_scope_ = false;
+@@ -796,6 +797,10 @@ void Scope::ResolveVariable(Scope* global_scope,
+         ASSERT(global_scope != NULL);
+         var = global_scope->DeclareGlobal(proxy->name());
+
++        if (qml_mode_ && !Isolate::Current()->global()->HasProperty(*(proxy->name()))) {
++          var->set_is_qml_global(true);
++        }
++
+       } else if (scope_inside_with_) {
+         // If we are inside a with statement we give up and look up
+         // the variable at runtime.
+@@ -816,6 +821,8 @@ void Scope::ResolveVariable(Scope* global_scope,
+         // variables.
+         if (context->GlobalIfNotShadowedByEval(proxy->name())) {
+           var = NonLocal(proxy->name(), Variable::DYNAMIC_GLOBAL);
++          if (qml_mode_ && !Isolate::Current()->global()->HasProperty(*(proxy->name())))
++            var->set_is_qml_global(true);
+
+         } else {
+           var = NonLocal(proxy->name(), Variable::DYNAMIC);
+@@ -827,6 +834,9 @@ void Scope::ResolveVariable(Scope* global_scope,
+         // variable is global unless it is shadowed by eval-introduced
+         // variables.
+         var = NonLocal(proxy->name(), Variable::DYNAMIC_GLOBAL);
++
++        if (qml_mode_ && !Isolate::Current()->global()->HasProperty(*(proxy->name())))
++          var->set_is_qml_global(true);
+       }
+     }
+   }
+diff --git a/src/scopes.h b/src/scopes.h
+index a0e56a4..6dd3f65 100644
+--- a/src/scopes.h
++++ b/src/scopes.h
+@@ -210,6 +210,11 @@ class Scope: public ZoneObject {
+     strict_mode_ = FLAG_strict_mode;
+   }
+
++  // Enable qml mode for this scope
++  void EnableQmlMode() {
++    qml_mode_ = true;
++  }
++
+   // ---------------------------------------------------------------------------
+   // Predicates.
+
+@@ -218,6 +223,7 @@ class Scope: public ZoneObject {
+   bool is_function_scope() const { return type_ == FUNCTION_SCOPE; }
+   bool is_global_scope() const { return type_ == GLOBAL_SCOPE; }
+   bool is_strict_mode() const { return strict_mode_; }
++  bool is_qml_mode() const { return qml_mode_; }
+
+   // Information about which scopes calls eval.
+   bool calls_eval() const { return scope_calls_eval_; }
+@@ -376,6 +382,7 @@ class Scope: public ZoneObject {
+   bool scope_contains_with_;  // this scope contains a 'with' statement
+   bool scope_calls_eval_;  // this scope contains an 'eval' call
+   bool strict_mode_;  // this scope is a strict mode scope
++  bool qml_mode_; // this scope is a qml mode scope
+
+   // Computed via PropagateScopeInfo.
+   bool outer_scope_calls_eval_;
+diff --git a/src/variables.cc b/src/variables.cc
+index 0502722..190baf6 100644
+--- a/src/variables.cc
++++ b/src/variables.cc
+@@ -99,7 +99,8 @@ Variable::Variable(Scope* scope,
+     rewrite_(NULL),
+     is_valid_LHS_(is_valid_LHS),
+     is_accessed_from_inner_scope_(false),
+-    is_used_(false) {
++    is_used_(false),
++    is_qml_global_(false) {
+   // names must be canonicalized for fast equality checks
+   ASSERT(name->IsSymbol());
+ }
+diff --git a/src/variables.h b/src/variables.h
+index b1ff0db..0b31d1a 100644
+--- a/src/variables.h
++++ b/src/variables.h
+@@ -141,6 +141,8 @@ class Variable: public ZoneObject {
+   Expression* rewrite() const { return rewrite_; }
+   void set_rewrite(Expression* expr) { rewrite_ = expr; }
+
++  bool is_qml_global() const { return is_qml_global_; }
++  void set_is_qml_global(bool is_qml_global) { is_qml_global_ = is_qml_global; }
+  private:
+   Scope* scope_;
+   Handle<String> name_;
+@@ -159,6 +161,9 @@ class Variable: public ZoneObject {
+   // Usage info.
+   bool is_accessed_from_inner_scope_;  // set by variable resolver
+   bool is_used_;
++
++  // QML info
++  bool is_qml_global_;
+ };
+
+
+diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
+index c365385..d923494 100644
+--- a/src/x64/code-stubs-x64.cc
++++ b/src/x64/code-stubs-x64.cc
+@@ -140,6 +140,10 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
+   __ movq(rbx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+   __ movq(Operand(rax, Context::SlotOffset(Context::GLOBAL_INDEX)), rbx);
+
++  // Copy the qml global object from the surrounding context.
++  __ movq(rbx, Operand(rsi, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
++  __ movq(Operand(rax, Context::SlotOffset(Context::QML_GLOBAL_INDEX)), rbx);
++
+   // Initialize the rest of the slots to undefined.
+   __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
+   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
+diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
+index 97168cd..c45cdb6 100644
+--- a/src/x64/full-codegen-x64.cc
++++ b/src/x64/full-codegen-x64.cc
+@@ -141,12 +141,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment cmnt(masm_, "[ Allocate local context");
+     // Argument to NewContext is the function, which is still in rdi.
+     __ push(rdi);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -1119,10 +1120,10 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
+
+   // All extension objects were empty and it is safe to use a global
+   // load IC call.
+-  __ movq(rax, GlobalObjectOperand());
++  __ movq(rax, slot->var()->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
+   __ Move(rcx, slot->var()->name());
+   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+-  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
++  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
+       ? RelocInfo::CODE_TARGET
+       : RelocInfo::CODE_TARGET_CONTEXT;
+   EmitCallIC(ic, mode);
+@@ -1227,9 +1228,9 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
+     // Use inline caching. Variable name is passed in rcx and the global
+     // object on the stack.
+     __ Move(rcx, var->name());
+-    __ movq(rax, GlobalObjectOperand());
++    __ movq(rax, var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
+     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
+     context()->Plug(rax);
+
+   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
+@@ -1806,11 +1807,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
+     // assignment.  Right-hand-side value is passed in rax, variable name in
+     // rcx, and the global object on the stack.
+     __ Move(rcx, var->name());
+-    __ movq(rdx, GlobalObjectOperand());
++    __ movq(rdx, var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
+     Handle<Code> ic = is_strict_mode()
+         ? isolate()->builtins()->StoreIC_Initialize_Strict()
+         : isolate()->builtins()->StoreIC_Initialize();
+-    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
++    EmitCallIC(ic, var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
+
+   } else if (op == Token::INIT_CONST) {
+     // Like var declarations, const declarations are hoisted to function
+@@ -2085,9 +2086,12 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+   // Push the strict mode flag.
+   __ Push(Smi::FromInt(strict_mode_flag()));
+
++  // Push the qml mode flag
++  __ Push(Smi::FromInt(is_qml_mode()));
++
+   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
+-                 : Runtime::kResolvePossiblyDirectEval, 4);
++                 : Runtime::kResolvePossiblyDirectEval, 5);
+ }
+
+
+@@ -2160,8 +2164,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
+   } else if (var != NULL && !var->is_this() && var->is_global()) {
+     // Call to a global variable.
+     // Push global object as receiver for the call IC lookup.
+-    __ push(GlobalObjectOperand());
+-    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
++    __ push(var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
++    EmitCallWithIC(expr, var->name(), var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
+   } else if (var != NULL && var->AsSlot() != NULL &&
+              var->AsSlot()->type() == Slot::LOOKUP) {
+     // Call to a lookup slot (dynamically introduced variable).
+diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
+index 202e7a2..45acbdf 100644
+--- a/src/x64/lithium-codegen-x64.cc
++++ b/src/x64/lithium-codegen-x64.cc
+@@ -174,12 +174,13 @@ bool LCodeGen::GeneratePrologue() {
+
+   // Possibly allocate a local context.
+   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+-  if (heap_slots > 0) {
++  if (heap_slots > 0 ||
++      (scope()->is_qml_mode() && scope()->is_global_scope())) {
+     Comment(";;; Allocate local context");
+     // Argument to NewContext is the function, which is still in rdi.
+     __ push(rdi);
+     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+-      FastNewContextStub stub(heap_slots);
++      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
+       __ CallStub(&stub);
+     } else {
+       __ CallRuntime(Runtime::kNewContext, 1);
+@@ -2540,7 +2541,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
+
+ void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
+   Register result = ToRegister(instr->result());
+-  __ movq(result, GlobalObjectOperand());
++  __ movq(result, instr->qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
+ }
+
+
+diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
+index 07ca3a5..00feeac 100644
+--- a/src/x64/lithium-x64.cc
++++ b/src/x64/lithium-x64.cc
+@@ -1194,7 +1194,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
+
+
+ LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
+-  return DefineAsRegister(new LGlobalObject);
++  return DefineAsRegister(new LGlobalObject(instr->qml_global()));
+ }
+
+
+diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
+index 15bb894..16f754c 100644
+--- a/src/x64/lithium-x64.h
++++ b/src/x64/lithium-x64.h
+@@ -1365,7 +1365,13 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
+
+ class LGlobalObject: public LTemplateInstruction<1, 0, 0> {
+  public:
++  explicit LGlobalObject(bool qml_global) : qml_global_(qml_global) {}
++
+   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
++
++  bool qml_global() { return qml_global_; }
++ private:
++  bool qml_global_;
+ };
+
+
+diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
+index 4c17720..aa284ed 100644
+--- a/src/x64/macro-assembler-x64.h
++++ b/src/x64/macro-assembler-x64.h
+@@ -1233,6 +1233,11 @@ static inline Operand GlobalObjectOperand() {
+ }
+
+
++static inline Operand QmlGlobalObjectOperand() {
++  return ContextOperand(rsi, Context::QML_GLOBAL_INDEX);
++}
++
++
+ // Provides access to exit frame stack space (not GCed).
+ static inline Operand StackSpaceOperand(int index) {
+ #ifdef _WIN64
+--
+1.7.2.3
+
diff --git a/src/v8/0006-Allow-access-to-the-calling-script-data.patch b/src/v8/0006-Allow-access-to-the-calling-script-data.patch
new file mode 100644
index 00000000000..d4acdf7a42c
--- /dev/null
+++ b/src/v8/0006-Allow-access-to-the-calling-script-data.patch
@@ -0,0 +1,48 @@
+From f890f0d1a1e5bd62711815489c87755a4f382436 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Wed, 25 May 2011 10:36:13 +1000
+Subject: [PATCH 06/13] Allow access to the calling script data
+
+---
+ include/v8.h |    1 +
+ src/api.cc   |   12 ++++++++++++
+ 2 files changed, 13 insertions(+), 0 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index a858eae..9aba4a8 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -3336,6 +3336,7 @@ class V8EXPORT Context {
+    */
+   static Local<Context> GetCalling();
+   static Local<Object> GetCallingQmlGlobal();
++  static Local<Value> GetCallingScriptData();
+
+   /**
+    * Sets the security token for the context.  To access an object in
+diff --git a/src/api.cc b/src/api.cc
+index 39767f4..ff74efb 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -3976,6 +3976,18 @@ v8::Local<v8::Object> Context::GetCallingQmlGlobal() {
+   }
+ }
+
++v8::Local<v8::Value> Context::GetCallingScriptData()
++{
++  i::Isolate* isolate = i::Isolate::Current();
++  if (IsDeadCheck(isolate, "v8::Context::GetCallingScriptData()")) {
++    return Local<Object>();
++  }
++
++  i::JavaScriptFrameIterator it;
++  if (it.done()) return Local<Object>();
++  i::Handle<i::Script> script(i::Script::cast(i::JSFunction::cast(it.frame()->function())->shared()->script()));
++  return Utils::ToLocal(i::Handle<i::Object>(script->data()));
++}
+
+ v8::Local<v8::Object> Context::Global() {
+   if (IsDeadCheck(i::Isolate::Current(), "v8::Context::Global()")) {
+--
+1.7.2.3
+
diff --git a/src/v8/0007-Fix-warnings.patch b/src/v8/0007-Fix-warnings.patch
new file mode 100644
index 00000000000..26141c8ae87
--- /dev/null
+++ b/src/v8/0007-Fix-warnings.patch
@@ -0,0 +1,46 @@
+From dac5d9db84cf20564621c679937ca7b9c6a8e880 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Fri, 27 May 2011 13:04:15 +1000
+Subject: [PATCH 07/13] Fix warnings
+
+---
+ include/v8.h |   16 ++++++++--------
+ 1 files changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 9aba4a8..8891dab 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -2415,7 +2415,7 @@ class V8EXPORT Extension {  // NOLINT
+             const char** deps = 0);
+   virtual ~Extension() { }
+   virtual v8::Handle<v8::FunctionTemplate>
+-      GetNativeFunction(v8::Handle<v8::String> name) {
++      GetNativeFunction(v8::Handle<v8::String>) {
+     return v8::Handle<v8::FunctionTemplate>();
+   }
+
+@@ -3721,13 +3721,13 @@ class Internals {
+     return *reinterpret_cast<T*>(addr);
+   }
+
+-  static inline bool CanCastToHeapObject(void* o) { return false; }
+-  static inline bool CanCastToHeapObject(Context* o) { return true; }
+-  static inline bool CanCastToHeapObject(String* o) { return true; }
+-  static inline bool CanCastToHeapObject(Object* o) { return true; }
+-  static inline bool CanCastToHeapObject(Message* o) { return true; }
+-  static inline bool CanCastToHeapObject(StackTrace* o) { return true; }
+-  static inline bool CanCastToHeapObject(StackFrame* o) { return true; }
++  static inline bool CanCastToHeapObject(void*) { return false; }
++  static inline bool CanCastToHeapObject(Context*) { return true; }
++  static inline bool CanCastToHeapObject(String*) { return true; }
++  static inline bool CanCastToHeapObject(Object*) { return true; }
++  static inline bool CanCastToHeapObject(Message*) { return true; }
++  static inline bool CanCastToHeapObject(StackTrace*) { return true; }
++  static inline bool CanCastToHeapObject(StackFrame*) { return true; }
+ };
+
+ }  // namespace internal
+--
+1.7.2.3
+
diff --git a/src/v8/0008-Add-custom-object-compare-callback.patch b/src/v8/0008-Add-custom-object-compare-callback.patch
new file mode 100644
index 00000000000..d7ef5c434d4
--- /dev/null
+++ b/src/v8/0008-Add-custom-object-compare-callback.patch
@@ -0,0 +1,489 @@
+From bec11b8b7f89d135e7d9a823ac4fe98c70d017cf Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Mon, 27 Jun 2011 14:57:28 +1000
+Subject: [PATCH 08/13] Add custom object compare callback
+
+A global custom object comparison callback can be set with:
+    V8::SetUserObjectComparisonCallbackFunction()
+When two JSObjects are compared (== or !=), if either one has
+the MarkAsUseUserObjectComparison() bit set, the custom comparison
+callback is invoked to do the actual comparison.
+
+This is useful when you have "value" objects that you want to
+compare as equal, even though they are actually different JS object
+instances.
+---
+ include/v8.h                |   13 +++++++++++++
+ src/api.cc                  |   19 +++++++++++++++++++
+ src/arm/code-stubs-arm.cc   |   42 ++++++++++++++++++++++++++++++++++++++++--
+ src/factory.cc              |    8 ++++++++
+ src/ia32/code-stubs-ia32.cc |   40 ++++++++++++++++++++++++++++++++++++++++
+ src/isolate.h               |    8 ++++++++
+ src/objects-inl.h           |   15 +++++++++++++++
+ src/objects.h               |   10 +++++++++-
+ src/runtime.cc              |   23 +++++++++++++++++++++++
+ src/runtime.h               |    1 +
+ src/top.cc                  |    5 +++++
+ src/x64/code-stubs-x64.cc   |   37 +++++++++++++++++++++++++++++++++++++
+ 12 files changed, 218 insertions(+), 3 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 8891dab..d5d6972 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -2365,6 +2365,12 @@ class V8EXPORT ObjectTemplate : public Template {
+   bool HasExternalResource();
+   void SetHasExternalResource(bool value);
+
++  /**
++   * Mark object instances of the template as using the user object
++   * comparison callback.
++   */
++  void MarkAsUseUserObjectComparison();
++
+  private:
+   ObjectTemplate();
+   static Local<ObjectTemplate> New(Handle<FunctionTemplate> constructor);
+@@ -2565,6 +2571,10 @@ typedef void (*FailedAccessCheckCallback)(Local<Object> target,
+                                           AccessType type,
+                                           Local<Value> data);
+
++// --- U s e r O b j e c t C o m p a r i s o n C a l l b a c k ---
++typedef bool (*UserObjectComparisonCallback)(Local<Object> lhs,
++                                             Local<Object> rhs);
++
+ // --- G a r b a g e C o l l e c t i o n  C a l l b a c k s
+
+ /**
+@@ -2815,6 +2825,9 @@ class V8EXPORT V8 {
+   /** Callback function for reporting failed access checks.*/
+   static void SetFailedAccessCheckCallbackFunction(FailedAccessCheckCallback);
+
++  /** Callback for user object comparisons */
++  static void SetUserObjectComparisonCallbackFunction(UserObjectComparisonCallback);
++
+   /**
+    * Enables the host application to receive a notification before a
+    * garbage collection.  Allocations are not allowed in the
+diff --git a/src/api.cc b/src/api.cc
+index ff74efb..2436031 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -1321,6 +1321,16 @@ void ObjectTemplate::SetHasExternalResource(bool value)
+   }
+ }
+
++void ObjectTemplate::MarkAsUseUserObjectComparison()
++{
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  if (IsDeadCheck(isolate, "v8::ObjectTemplate::MarkAsUseUserObjectComparison()")) {
++    return;
++  }
++  ENTER_V8(isolate);
++  EnsureConstructor(this);
++  Utils::OpenHandle(this)->set_use_user_object_comparison(i::Smi::FromInt(1));
++}
+
+ // --- S c r i p t D a t a ---
+
+@@ -4632,6 +4642,15 @@ void V8::SetFailedAccessCheckCallbackFunction(
+   isolate->SetFailedAccessCheckCallback(callback);
+ }
+
++void V8::SetUserObjectComparisonCallbackFunction(
++      UserObjectComparisonCallback callback) {
++  i::Isolate* isolate = i::Isolate::Current();
++  if (IsDeadCheck(isolate, "v8::V8::SetUserObjectComparisonCallbackFunction()")) {
++    return;
++  }
++  isolate->SetUserObjectComparisonCallback(callback);
++}
++
+ void V8::AddObjectGroup(Persistent<Value>* objects,
+                         size_t length,
+                         RetainedObjectInfo* info) {
+diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
+index a2626bf..749c9be 100644
+--- a/src/arm/code-stubs-arm.cc
++++ b/src/arm/code-stubs-arm.cc
+@@ -1563,6 +1563,36 @@ void CompareStub::Generate(MacroAssembler* masm) {
+   // NOTICE! This code is only reached after a smi-fast-case check, so
+   // it is certain that at least one operand isn't a smi.
+
++  {
++      Label not_user_equal, user_equal;
++      __ and_(r2, r1, Operand(r0));
++      __ tst(r2, Operand(kSmiTagMask));
++      __ b(eq, &not_user_equal);
++
++      __ CompareObjectType(r0, r2, r4, JS_OBJECT_TYPE);
++      __ b(ne, &not_user_equal);
++
++      __ CompareObjectType(r1, r3, r4, JS_OBJECT_TYPE);
++      __ b(ne, &not_user_equal);
++
++      __ ldrb(r2, FieldMemOperand(r2, Map::kBitField3Offset));
++      __ and_(r2, r2, Operand(1 << Map::kUseUserObjectComparison));
++      __ cmp(r2, Operand(1 << Map::kUseUserObjectComparison));
++      __ b(eq, &user_equal);
++
++      __ ldrb(r3, FieldMemOperand(r3, Map::kBitField3Offset));
++      __ and_(r3, r3, Operand(1 << Map::kUseUserObjectComparison));
++      __ cmp(r3, Operand(1 << Map::kUseUserObjectComparison));
++      __ b(ne, &not_user_equal);
++
++      __ bind(&user_equal);
++
++      __ Push(r0, r1);
++      __ TailCallRuntime(Runtime::kUserObjectEquals, 2, 1);
++
++      __ bind(&not_user_equal);
++  }
++
+   // Handle the case where the objects are identical.  Either returns the answer
+   // or goes to slow.  Only falls through if the objects were not identical.
+   EmitIdenticalObjectComparison(masm, &slow, cc_, never_nan_nan_);
+@@ -5802,10 +5832,18 @@ void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
+   __ tst(r2, Operand(kSmiTagMask));
+   __ b(eq, &miss);
+
+-  __ CompareObjectType(r0, r2, r2, JS_OBJECT_TYPE);
++  __ CompareObjectType(r0, r2, r3, JS_OBJECT_TYPE);
+   __ b(ne, &miss);
+-  __ CompareObjectType(r1, r2, r2, JS_OBJECT_TYPE);
++  __ ldrb(r2, FieldMemOperand(r2, Map::kBitField3Offset));
++  __ and_(r2, r2, Operand(1 << Map::kUseUserObjectComparison));
++  __ cmp(r2, Operand(1 << Map::kUseUserObjectComparison));
++  __ b(eq, &miss);
++  __ CompareObjectType(r1, r2, r3, JS_OBJECT_TYPE);
+   __ b(ne, &miss);
++  __ ldrb(r2, FieldMemOperand(r2, Map::kBitField3Offset));
++  __ and_(r2, r2, Operand(1 << Map::kUseUserObjectComparison));
++  __ cmp(r2, Operand(1 << Map::kUseUserObjectComparison));
++  __ b(eq, &miss);
+
+   ASSERT(GetCondition() == eq);
+   __ sub(r0, r0, Operand(r1));
+diff --git a/src/factory.cc b/src/factory.cc
+index d530a75..6f8c7de 100644
+--- a/src/factory.cc
++++ b/src/factory.cc
+@@ -998,6 +998,7 @@ Handle<JSFunction> Factory::CreateApiFunction(
+
+   int internal_field_count = 0;
+   bool has_external_resource = false;
++  bool use_user_object_comparison = false;
+
+   if (!obj->instance_template()->IsUndefined()) {
+     Handle<ObjectTemplateInfo> instance_template =
+@@ -1007,6 +1008,8 @@ Handle<JSFunction> Factory::CreateApiFunction(
+         Smi::cast(instance_template->internal_field_count())->value();
+     has_external_resource =
+         !instance_template->has_external_resource()->IsUndefined();
++    use_user_object_comparison =
++        !instance_template->use_user_object_comparison()->IsUndefined();
+   }
+
+   int instance_size = kPointerSize * internal_field_count;
+@@ -1051,6 +1054,11 @@ Handle<JSFunction> Factory::CreateApiFunction(
+     map->set_has_external_resource(true);
+   }
+
++  // Mark as using user object comparison if needed
++  if (use_user_object_comparison) {
++    map->set_use_user_object_comparison(true);
++  }
++
+   // Mark as undetectable if needed.
+   if (obj->undetectable()) {
+     map->set_is_undetectable();
+diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
+index afa599e..0964ab9 100644
+--- a/src/ia32/code-stubs-ia32.cc
++++ b/src/ia32/code-stubs-ia32.cc
+@@ -3447,6 +3447,40 @@ void CompareStub::Generate(MacroAssembler* masm) {
+     __ Assert(not_zero, "Unexpected smi operands.");
+   }
+
++  {
++    NearLabel not_user_equal, user_equal;
++    __ test(eax, Immediate(kSmiTagMask));
++    __ j(zero, &not_user_equal);
++    __ test(edx, Immediate(kSmiTagMask));
++    __ j(zero, &not_user_equal);
++
++    __ CmpObjectType(eax, JS_OBJECT_TYPE, ebx);
++    __ j(not_equal, &not_user_equal);
++
++    __ CmpObjectType(edx, JS_OBJECT_TYPE, ecx);
++    __ j(not_equal, &not_user_equal);
++
++    __ test_b(FieldOperand(ebx, Map::kBitField3Offset),
++              1 << Map::kUseUserObjectComparison);
++    __ j(not_zero, &user_equal);
++    __ test_b(FieldOperand(ecx, Map::kBitField3Offset),
++              1 << Map::kUseUserObjectComparison);
++    __ j(not_zero, &user_equal);
++
++    __ jmp(&not_user_equal);
++
++    __ bind(&user_equal);
++
++    __ pop(ebx); // Return address.
++    __ push(eax);
++    __ push(edx);
++    __ push(ebx);
++    __ TailCallRuntime(Runtime::kUserObjectEquals, 2, 1);
++
++    __ bind(&not_user_equal);
++  }
++
++
+   // NOTICE! This code is only reached after a smi-fast-case check, so
+   // it is certain that at least one operand isn't a smi.
+
+@@ -5592,8 +5626,14 @@ void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
+
+   __ CmpObjectType(eax, JS_OBJECT_TYPE, ecx);
+   __ j(not_equal, &miss, not_taken);
++  __ test_b(FieldOperand(ecx, Map::kBitField3Offset),
++            1 << Map::kUseUserObjectComparison);
++  __ j(not_zero, &miss);
+   __ CmpObjectType(edx, JS_OBJECT_TYPE, ecx);
+   __ j(not_equal, &miss, not_taken);
++  __ test_b(FieldOperand(ecx, Map::kBitField3Offset),
++            1 << Map::kUseUserObjectComparison);
++  __ j(not_zero, &miss);
+
+   ASSERT(GetCondition() == equal);
+   __ sub(eax, Operand(edx));
+diff --git a/src/isolate.h b/src/isolate.h
+index 35ffcb4..8130397 100644
+--- a/src/isolate.h
++++ b/src/isolate.h
+@@ -267,6 +267,9 @@ class ThreadLocalTop BASE_EMBEDDED {
+   // Call back function to report unsafe JS accesses.
+   v8::FailedAccessCheckCallback failed_access_check_callback_;
+
++  // Call back function for user object comparisons
++  v8::UserObjectComparisonCallback user_object_comparison_callback_;
++
+  private:
+   void InitializeInternal();
+
+@@ -699,6 +702,11 @@ class Isolate {
+   void SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback);
+   void ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type);
+
++  void SetUserObjectComparisonCallback(v8::UserObjectComparisonCallback callback);
++  inline v8::UserObjectComparisonCallback UserObjectComparisonCallback() {
++      return thread_local_top()->user_object_comparison_callback_;
++  }
++
+   // Exception throwing support. The caller should use the result
+   // of Throw() as its return value.
+   Failure* Throw(Object* exception, MessageLocation* location = NULL);
+diff --git a/src/objects-inl.h b/src/objects-inl.h
+index 1c7f83e..1765441 100644
+--- a/src/objects-inl.h
++++ b/src/objects-inl.h
+@@ -2552,6 +2552,19 @@ bool Map::has_external_resource()
+ }
+
+
++void Map::set_use_user_object_comparison(bool value) {
++  if (value) {
++    set_bit_field3(bit_field3() | (1 << kUseUserObjectComparison));
++  } else {
++    set_bit_field3(bit_field3() & ~(1 << kUseUserObjectComparison));
++  }
++}
++
++bool Map::use_user_object_comparison() {
++    return ((1 << kUseUserObjectComparison) & bit_field3()) != 0;
++}
++
++
+ void Map::set_named_interceptor_is_fallback(bool value)
+ {
+   if (value) {
+@@ -3050,6 +3063,8 @@ ACCESSORS(ObjectTemplateInfo, internal_field_count, Object,
+           kInternalFieldCountOffset)
+ ACCESSORS(ObjectTemplateInfo, has_external_resource, Object,
+           kHasExternalResourceOffset)
++ACCESSORS(ObjectTemplateInfo, use_user_object_comparison, Object,
++          kUseUserObjectComparisonOffset)
+
+ ACCESSORS(SignatureInfo, receiver, Object, kReceiverOffset)
+ ACCESSORS(SignatureInfo, args, Object, kArgsOffset)
+diff --git a/src/objects.h b/src/objects.h
+index edbc47a..e75e9f1 100644
+--- a/src/objects.h
++++ b/src/objects.h
+@@ -3724,6 +3724,11 @@ class Map: public HeapObject {
+   inline void set_has_external_resource(bool value);
+   inline bool has_external_resource();
+
++
++  // Tells whether the user object comparison callback should be used for
++  // comparisons involving this object
++  inline void set_use_user_object_comparison(bool value);
++  inline bool use_user_object_comparison();
+
+   // Whether the named interceptor is a fallback interceptor or not
+   inline void set_named_interceptor_is_fallback(bool value);
+@@ -3922,6 +3927,7 @@ class Map: public HeapObject {
+   // Bit positions for bit field 3
+   static const int kNamedInterceptorIsFallback = 0;
+   static const int kHasExternalResource = 1;
++  static const int kUseUserObjectComparison = 2;
+
+   // Layout of the default cache. It holds alternating name and code objects.
+   static const int kCodeCacheEntrySize = 2;
+@@ -6442,6 +6448,7 @@ class ObjectTemplateInfo: public TemplateInfo {
+   DECL_ACCESSORS(constructor, Object)
+   DECL_ACCESSORS(internal_field_count, Object)
+   DECL_ACCESSORS(has_external_resource, Object)
++  DECL_ACCESSORS(use_user_object_comparison, Object)
+
+   static inline ObjectTemplateInfo* cast(Object* obj);
+
+@@ -6459,7 +6466,8 @@ class ObjectTemplateInfo: public TemplateInfo {
+   static const int kInternalFieldCountOffset =
+       kConstructorOffset + kPointerSize;
+   static const int kHasExternalResourceOffset = kInternalFieldCountOffset + kPointerSize;
+-  static const int kSize = kHasExternalResourceOffset + kPointerSize;
++  static const int kUseUserObjectComparisonOffset = kHasExternalResourceOffset + kPointerSize;
++  static const int kSize = kUseUserObjectComparisonOffset + kPointerSize;
+ };
+
+
+diff --git a/src/runtime.cc b/src/runtime.cc
+index 827d954..d552ddb 100644
+--- a/src/runtime.cc
++++ b/src/runtime.cc
+@@ -6279,6 +6279,29 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringEquals) {
+ }
+
+
++RUNTIME_FUNCTION(MaybeObject*, Runtime_UserObjectEquals) {
++  NoHandleAllocation ha;
++  ASSERT(args.length() == 2);
++
++  CONVERT_CHECKED(JSObject, lhs, args[1]);
++  CONVERT_CHECKED(JSObject, rhs, args[0]);
++
++  bool result;
++
++  v8::UserObjectComparisonCallback callback = isolate->UserObjectComparisonCallback();
++  if (callback) {
++      HandleScope scope(isolate);
++      Handle<JSObject> lhs_handle(lhs);
++      Handle<JSObject> rhs_handle(rhs);
++      result = callback(v8::Utils::ToLocal(lhs_handle), v8::Utils::ToLocal(rhs_handle));
++  } else {
++      result = (lhs == rhs);
++  }
++
++  return Smi::FromInt(result?0:1);
++}
++
++
+ RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberCompare) {
+   NoHandleAllocation ha;
+   ASSERT(args.length() == 3);
+diff --git a/src/runtime.h b/src/runtime.h
+index 5e97173..0d754f9 100644
+--- a/src/runtime.h
++++ b/src/runtime.h
+@@ -146,6 +146,7 @@ namespace internal {
+   /* Comparisons */ \
+   F(NumberEquals, 2, 1) \
+   F(StringEquals, 2, 1) \
++  F(UserObjectEquals, 2, 1) \
+   \
+   F(NumberCompare, 3, 1) \
+   F(SmiLexicographicCompare, 2, 1) \
+diff --git a/src/top.cc b/src/top.cc
+index e078ee9..c345383 100644
+--- a/src/top.cc
++++ b/src/top.cc
+@@ -68,6 +68,7 @@ void ThreadLocalTop::InitializeInternal() {
+   thread_id_ = ThreadId::Invalid();
+   external_caught_exception_ = false;
+   failed_access_check_callback_ = NULL;
++  user_object_comparison_callback_ = NULL;
+   save_context_ = NULL;
+   catcher_ = NULL;
+ }
+@@ -387,6 +388,10 @@ void Isolate::SetFailedAccessCheckCallback(
+   thread_local_top()->failed_access_check_callback_ = callback;
+ }
+
++void Isolate::SetUserObjectComparisonCallback(
++    v8::UserObjectComparisonCallback callback) {
++  thread_local_top()->user_object_comparison_callback_ = callback;
++}
+
+ void Isolate::ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type) {
+   if (!thread_local_top()->failed_access_check_callback_) return;
+diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
+index d923494..10b9b56 100644
+--- a/src/x64/code-stubs-x64.cc
++++ b/src/x64/code-stubs-x64.cc
+@@ -2443,6 +2443,37 @@ void CompareStub::Generate(MacroAssembler* masm) {
+     __ bind(&ok);
+   }
+
++  {
++    NearLabel not_user_equal, user_equal;
++    __ JumpIfSmi(rax, &not_user_equal);
++    __ JumpIfSmi(rdx, &not_user_equal);
++
++    __ CmpObjectType(rax, JS_OBJECT_TYPE, rbx);
++    __ j(not_equal, &not_user_equal);
++
++    __ CmpObjectType(rdx, JS_OBJECT_TYPE, rcx);
++    __ j(not_equal, &not_user_equal);
++
++    __ testb(FieldOperand(rbx, Map::kBitField3Offset),
++             Immediate(1 << Map::kUseUserObjectComparison));
++    __ j(not_zero, &user_equal);
++    __ testb(FieldOperand(rcx, Map::kBitField3Offset),
++             Immediate(1 << Map::kUseUserObjectComparison));
++    __ j(not_zero, &user_equal);
++
++    __ jmp(&not_user_equal);
++
++    __ bind(&user_equal);
++
++    __ pop(rbx); // Return address.
++    __ push(rax);
++    __ push(rdx);
++    __ push(rbx);
++    __ TailCallRuntime(Runtime::kUserObjectEquals, 2, 1);
++
++    __ bind(&not_user_equal);
++  }
++
+   // The compare stub returns a positive, negative, or zero 64-bit integer
+   // value in rax, corresponding to result of comparing the two inputs.
+   // NOTICE! This code is only reached after a smi-fast-case check, so
+@@ -4471,8 +4502,14 @@ void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
+
+   __ CmpObjectType(rax, JS_OBJECT_TYPE, rcx);
+   __ j(not_equal, &miss, not_taken);
++  __ testb(FieldOperand(rcx, Map::kBitField3Offset),
++           Immediate(1 << Map::kUseUserObjectComparison));
++  __ j(not_zero, &miss);
+   __ CmpObjectType(rdx, JS_OBJECT_TYPE, rcx);
+   __ j(not_equal, &miss, not_taken);
++  __ testb(FieldOperand(rcx, Map::kBitField3Offset),
++           Immediate(1 << Map::kUseUserObjectComparison));
++  __ j(not_zero, &miss);
+
+   ASSERT(GetCondition() == equal);
+   __ subq(rax, rdx);
+--
+1.7.2.3
+
diff --git a/src/v8/0009-Add-CallAsFunction-method-to-the-Object-class-in-the.patch b/src/v8/0009-Add-CallAsFunction-method-to-the-Object-class-in-the.patch
new file mode 100644
index 00000000000..d197ac9e484
--- /dev/null
+++ b/src/v8/0009-Add-CallAsFunction-method-to-the-Object-class-in-the.patch
@@ -0,0 +1,286 @@
+From 4183b973ed3bd603784c798dfa63ba48f6b68003 Mon Sep 17 00:00:00 2001
+From: ager@chromium.org <ager@chromium.org>
+Date: Wed, 4 May 2011 13:03:08 +0000
+Subject: [PATCH 09/13] Add CallAsFunction method to the Object class in the API
+
+Patch by Peter Varga.
+
+BUG=v8:1336
+TEST=cctest/test-api/CallAsFunction
+
+Review URL: http://codereview.chromium.org/6883045
+
+git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@7781 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
+---
+ include/v8.h            |    8 +++
+ src/api.cc              |   31 +++++++++++
+ src/execution.cc        |   24 ++++++++
+ src/execution.h         |    2 +
+ test/cctest/test-api.cc |  135 ++++++++++++++++++++++++++++++++++-------------
+ 5 files changed, 163 insertions(+), 37 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index d5d6972..8a8e1cd 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -1757,6 +1757,14 @@ class Object : public Value {
+   V8EXPORT ExternalArrayType GetIndexedPropertiesExternalArrayDataType();
+   V8EXPORT int GetIndexedPropertiesExternalArrayDataLength();
+
++  /**
++   * Call an Object as a function if a callback is set by the
++   * ObjectTemplate::SetCallAsFunctionHandler method.
++   */
++  V8EXPORT Local<Value> CallAsFunction(Handle<Object> recv,
++                                       int argc,
++                                       Handle<Value> argv[]);
++
+   V8EXPORT static Local<Object> New();
+   static inline Object* Cast(Value* obj);
+  private:
+diff --git a/src/api.cc b/src/api.cc
+index 2436031..e412e51 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -3259,6 +3259,37 @@ int v8::Object::GetIndexedPropertiesExternalArrayDataLength() {
+ }
+
+
++Local<v8::Value> Object::CallAsFunction(v8::Handle<v8::Object> recv, int argc,
++                                        v8::Handle<v8::Value> argv[]) {
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  ON_BAILOUT(isolate, "v8::Object::CallAsFunction()",
++             return Local<v8::Value>());
++  LOG_API(isolate, "Object::CallAsFunction");
++  ENTER_V8(isolate);
++  HandleScope scope;
++  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
++  i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
++  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
++  i::Object*** args = reinterpret_cast<i::Object***>(argv);
++  i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>();
++  if (obj->IsJSFunction()) {
++    fun = i::Handle<i::JSFunction>::cast(obj);
++  } else {
++    EXCEPTION_PREAMBLE(isolate);
++    i::Handle<i::Object> delegate =
++        i::Execution::TryGetFunctionDelegate(obj, &has_pending_exception);
++    EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
++    fun = i::Handle<i::JSFunction>::cast(delegate);
++    recv_obj = obj;
++  }
++  EXCEPTION_PREAMBLE(isolate);
++  i::Handle<i::Object> returned =
++      i::Execution::Call(fun, recv_obj, argc, args, &has_pending_exception);
++  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
++  return scope.Close(Utils::ToLocal(returned));
++}
++
++
+ Local<v8::Object> Function::NewInstance() const {
+   return NewInstance(0, NULL);
+ }
+diff --git a/src/execution.cc b/src/execution.cc
+index 1632076..894d741 100644
+--- a/src/execution.cc
++++ b/src/execution.cc
+@@ -254,6 +254,30 @@ Handle<Object> Execution::GetFunctionDelegate(Handle<Object> object) {
+ }
+
+
++Handle<Object> Execution::TryGetFunctionDelegate(Handle<Object> object,
++                                                 bool* has_pending_exception) {
++  ASSERT(!object->IsJSFunction());
++  Isolate* isolate = Isolate::Current();
++
++  // Objects created through the API can have an instance-call handler
++  // that should be used when calling the object as a function.
++  if (object->IsHeapObject() &&
++      HeapObject::cast(*object)->map()->has_instance_call_handler()) {
++    return Handle<JSFunction>(
++        isolate->global_context()->call_as_function_delegate());
++  }
++
++  // If the Object doesn't have an instance-call handler we should
++  // throw a non-callable exception.
++  i::Handle<i::Object> error_obj = isolate->factory()->NewTypeError(
++      "called_non_callable", i::HandleVector<i::Object>(&object, 1));
++  isolate->Throw(*error_obj);
++  *has_pending_exception = true;
++
++  return isolate->factory()->undefined_value();
++}
++
++
+ Handle<Object> Execution::GetConstructorDelegate(Handle<Object> object) {
+   ASSERT(!object->IsJSFunction());
+   Isolate* isolate = Isolate::Current();
+diff --git a/src/execution.h b/src/execution.h
+index a476eb4..0a0be51 100644
+--- a/src/execution.h
++++ b/src/execution.h
+@@ -144,6 +144,8 @@ class Execution : public AllStatic {
+   // Get a function delegate (or undefined) for the given non-function
+   // object. Used for support calling objects as functions.
+   static Handle<Object> GetFunctionDelegate(Handle<Object> object);
++  static Handle<Object> TryGetFunctionDelegate(Handle<Object> object,
++                                               bool* has_pending_exception);
+
+   // Get a function delegate (or undefined) for the given non-function
+   // object. Used for support calling objects as constructors.
+diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
+index d7621d1..693d51e 100644
+--- a/test/cctest/test-api.cc
++++ b/test/cctest/test-api.cc
+@@ -6962,50 +6962,111 @@ THREADED_TEST(CallAsFunction) {
+   v8::HandleScope scope;
+   LocalContext context;
+
+-  Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
+-  Local<ObjectTemplate> instance_template = t->InstanceTemplate();
+-  instance_template->SetCallAsFunctionHandler(call_as_function);
+-  Local<v8::Object> instance = t->GetFunction()->NewInstance();
+-  context->Global()->Set(v8_str("obj"), instance);
+-  v8::TryCatch try_catch;
+-  Local<Value> value;
+-  CHECK(!try_catch.HasCaught());
++  { Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
++    Local<ObjectTemplate> instance_template = t->InstanceTemplate();
++    instance_template->SetCallAsFunctionHandler(call_as_function);
++    Local<v8::Object> instance = t->GetFunction()->NewInstance();
++    context->Global()->Set(v8_str("obj"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
+
+-  value = CompileRun("obj(42)");
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(42, value->Int32Value());
++    value = CompileRun("obj(42)");
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(42, value->Int32Value());
+
+-  value = CompileRun("(function(o){return o(49)})(obj)");
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(49, value->Int32Value());
++    value = CompileRun("(function(o){return o(49)})(obj)");
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(49, value->Int32Value());
+
+-  // test special case of call as function
+-  value = CompileRun("[obj]['0'](45)");
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(45, value->Int32Value());
++    // test special case of call as function
++    value = CompileRun("[obj]['0'](45)");
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(45, value->Int32Value());
+
+-  value = CompileRun("obj.call = Function.prototype.call;"
+-                     "obj.call(null, 87)");
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(87, value->Int32Value());
++    value = CompileRun("obj.call = Function.prototype.call;"
++                       "obj.call(null, 87)");
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(87, value->Int32Value());
+
+-  // Regression tests for bug #1116356: Calling call through call/apply
+-  // must work for non-function receivers.
+-  const char* apply_99 = "Function.prototype.call.apply(obj, [this, 99])";
+-  value = CompileRun(apply_99);
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(99, value->Int32Value());
++    // Regression tests for bug #1116356: Calling call through call/apply
++    // must work for non-function receivers.
++    const char* apply_99 = "Function.prototype.call.apply(obj, [this, 99])";
++    value = CompileRun(apply_99);
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(99, value->Int32Value());
+
+-  const char* call_17 = "Function.prototype.call.call(obj, this, 17)";
+-  value = CompileRun(call_17);
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(17, value->Int32Value());
++    const char* call_17 = "Function.prototype.call.call(obj, this, 17)";
++    value = CompileRun(call_17);
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(17, value->Int32Value());
+
+-  // Check that the call-as-function handler can be called through
+-  // new.
+-  value = CompileRun("new obj(43)");
+-  CHECK(!try_catch.HasCaught());
+-  CHECK_EQ(-43, value->Int32Value());
++    // Check that the call-as-function handler can be called through
++    // new.
++    value = CompileRun("new obj(43)");
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(-43, value->Int32Value());
++
++    // Check that the call-as-function handler can be called through
++    // the API.
++    v8::Handle<Value> args[] = { v8_num(28) };
++    value = instance->CallAsFunction(instance, 1, args);
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(28, value->Int32Value());
++  }
++
++  { Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
++    Local<ObjectTemplate> instance_template = t->InstanceTemplate();
++    Local<v8::Object> instance = t->GetFunction()->NewInstance();
++    context->Global()->Set(v8_str("obj2"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    // Call an object without call-as-function handler through the JS
++    value = CompileRun("obj2(28)");
++    CHECK(value.IsEmpty());
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value1(try_catch.Exception());
++    CHECK_EQ(*exception_value1,
++             "TypeError: Property 'obj2' of object "
++             "#<Object> is not a function");
++    try_catch.Reset();
++
++    // Call an object without call-as-function handler through the API
++    value = CompileRun("obj2(28)");
++    v8::Handle<Value> args[] = { v8_num(28) };
++    value = instance->CallAsFunction(instance, 1, args);
++    CHECK(value.IsEmpty());
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value2(try_catch.Exception());
++    CHECK_EQ(*exception_value2, "TypeError: [object Object] is not a function");
++    try_catch.Reset();
++  }
++
++  { Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
++    Local<ObjectTemplate> instance_template = t->InstanceTemplate();
++    instance_template->SetCallAsFunctionHandler(ThrowValue);
++    Local<v8::Object> instance = t->GetFunction()->NewInstance();
++    context->Global()->Set(v8_str("obj3"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    // Catch the exception which is thrown by call-as-function handler
++    value = CompileRun("obj3(22)");
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value1(try_catch.Exception());
++    CHECK_EQ(*exception_value1, "22");
++    try_catch.Reset();
++
++    v8::Handle<Value> args[] = { v8_num(23) };
++    value = instance->CallAsFunction(instance, 1, args);
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value2(try_catch.Exception());
++    CHECK_EQ(*exception_value2, "23");
++    try_catch.Reset();
++  }
+ }
+
+
+--
+1.7.2.3
+
diff --git a/src/v8/0010-Implement-CallAsConstructor-method-for-Object-in-the.patch b/src/v8/0010-Implement-CallAsConstructor-method-for-Object-in-the.patch
new file mode 100644
index 00000000000..cb4dd186d68
--- /dev/null
+++ b/src/v8/0010-Implement-CallAsConstructor-method-for-Object-in-the.patch
@@ -0,0 +1,397 @@
+From 3d6d4249878f7960eac4c9c94e0f2529f9a58c4a Mon Sep 17 00:00:00 2001
+From: ager@chromium.org <ager@chromium.org>
+Date: Fri, 6 May 2011 11:07:52 +0000
+Subject: [PATCH 10/13] Implement CallAsConstructor method for Object in the API
+
+Patch by Peter Varga.
+
+BUG=v8:1348
+TEST=cctest/test-api/ConstructorForObject
+
+Review URL: http://codereview.chromium.org/6902108
+
+git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@7803 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
+---
+ include/v8.h            |    8 ++
+ src/api.cc              |   41 +++++++++-
+ src/execution.cc        |   28 +++++++
+ src/execution.h         |    2 +
+ test/cctest/test-api.cc |  205 +++++++++++++++++++++++++++++++++++++++++++++--
+ 5 files changed, 276 insertions(+), 8 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 8a8e1cd..84462b5 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -1765,6 +1765,14 @@ class Object : public Value {
+                                        int argc,
+                                        Handle<Value> argv[]);
+ 
++  /**
++   * Call an Object as a consturctor if a callback is set by the
++   * ObjectTemplate::SetCallAsFunctionHandler method.
++   * Note: This method behaves like the Function::NewInstance method.
++   */
++  V8EXPORT Local<Value> CallAsConstructor(int argc,
++                                          Handle<Value> argv[]);
++
+   V8EXPORT static Local<Object> New();
+   static inline Object* Cast(Value* obj);
+  private:
+diff --git a/src/api.cc b/src/api.cc
+index e412e51..1a585d6 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -3266,7 +3266,7 @@ Local<v8::Value> Object::CallAsFunction(v8::Handle<v8::Object> recv, int argc,
+              return Local<v8::Value>());
+   LOG_API(isolate, "Object::CallAsFunction");
+   ENTER_V8(isolate);
+-  HandleScope scope;
++  i::HandleScope scope(isolate);
+   i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
+   i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
+   STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
+@@ -3286,7 +3286,44 @@ Local<v8::Value> Object::CallAsFunction(v8::Handle<v8::Object> recv, int argc,
+   i::Handle<i::Object> returned =
+       i::Execution::Call(fun, recv_obj, argc, args, &has_pending_exception);
+   EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
+-  return scope.Close(Utils::ToLocal(returned));
++  return Utils::ToLocal(scope.CloseAndEscape(returned));
++}
++
++
++Local<v8::Value> Object::CallAsConstructor(int argc,
++                                           v8::Handle<v8::Value> argv[]) {
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  ON_BAILOUT(isolate, "v8::Object::CallAsConstructor()",
++             return Local<v8::Object>());
++  LOG_API(isolate, "Object::CallAsConstructor");
++  ENTER_V8(isolate);
++  i::HandleScope scope(isolate);
++  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
++  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
++  i::Object*** args = reinterpret_cast<i::Object***>(argv);
++  if (obj->IsJSFunction()) {
++    i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(obj);
++    EXCEPTION_PREAMBLE(isolate);
++    i::Handle<i::Object> returned =
++        i::Execution::New(fun, argc, args, &has_pending_exception);
++    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
++    return Utils::ToLocal(scope.CloseAndEscape(
++        i::Handle<i::JSObject>::cast(returned)));
++  }
++  EXCEPTION_PREAMBLE(isolate);
++  i::Handle<i::Object> delegate =
++      i::Execution::TryGetConstructorDelegate(obj, &has_pending_exception);
++  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
++  if (!delegate->IsUndefined()) {
++    i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(delegate);
++    EXCEPTION_PREAMBLE(isolate);
++    i::Handle<i::Object> returned =
++        i::Execution::Call(fun, obj, argc, args, &has_pending_exception);
++    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
++    ASSERT(!delegate->IsUndefined());
++    return Utils::ToLocal(scope.CloseAndEscape(returned));
++  }
++  return Local<v8::Object>();
+ }
+
+
+diff --git a/src/execution.cc b/src/execution.cc
+index 894d741..afb352c 100644
+--- a/src/execution.cc
++++ b/src/execution.cc
+@@ -297,6 +297,34 @@ Handle<Object> Execution::GetConstructorDelegate(Handle<Object> object) {
+ }
+
+
++Handle<Object> Execution::TryGetConstructorDelegate(
++    Handle<Object> object,
++    bool* has_pending_exception) {
++  ASSERT(!object->IsJSFunction());
++  Isolate* isolate = Isolate::Current();
++
++  // If you return a function from here, it will be called when an
++  // attempt is made to call the given object as a constructor.
++
++  // Objects created through the API can have an instance-call handler
++  // that should be used when calling the object as a function.
++  if (object->IsHeapObject() &&
++      HeapObject::cast(*object)->map()->has_instance_call_handler()) {
++    return Handle<JSFunction>(
++        isolate->global_context()->call_as_constructor_delegate());
++  }
++
++  // If the Object doesn't have an instance-call handler we should
++  // throw a non-callable exception.
++  i::Handle<i::Object> error_obj = isolate->factory()->NewTypeError(
++      "called_non_callable", i::HandleVector<i::Object>(&object, 1));
++  isolate->Throw(*error_obj);
++  *has_pending_exception = true;
++
++  return isolate->factory()->undefined_value();
++}
++
++
+ bool StackGuard::IsStackOverflow() {
+   ExecutionAccess access(isolate_);
+   return (thread_local_.jslimit_ != kInterruptLimit &&
+diff --git a/src/execution.h b/src/execution.h
+index 0a0be51..ec2a195 100644
+--- a/src/execution.h
++++ b/src/execution.h
+@@ -150,6 +150,8 @@ class Execution : public AllStatic {
+   // Get a function delegate (or undefined) for the given non-function
+   // object. Used for support calling objects as constructors.
+   static Handle<Object> GetConstructorDelegate(Handle<Object> object);
++  static Handle<Object> TryGetConstructorDelegate(Handle<Object> object,
++                                                  bool* has_pending_exception);
+ };
+
+
+diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
+index 693d51e..1334f63 100644
+--- a/test/cctest/test-api.cc
++++ b/test/cctest/test-api.cc
+@@ -6746,6 +6746,200 @@ THREADED_TEST(Constructor) {
+   CHECK(value->BooleanValue());
+ }
+
++
++static Handle<Value> ConstructorCallback(const Arguments& args) {
++  ApiTestFuzzer::Fuzz();
++  Local<Object> This;
++
++  if (args.IsConstructCall()) {
++    Local<Object> Holder = args.Holder();
++    This = Object::New();
++    Local<Value> proto = Holder->GetPrototype();
++    if (proto->IsObject()) {
++      This->SetPrototype(proto);
++    }
++  } else {
++    This = args.This();
++  }
++
++  This->Set(v8_str("a"), args[0]);
++  return This;
++}
++
++
++static Handle<Value> FakeConstructorCallback(const Arguments& args) {
++  ApiTestFuzzer::Fuzz();
++  return args[0];
++}
++
++
++THREADED_TEST(ConstructorForObject) {
++  v8::HandleScope handle_scope;
++  LocalContext context;
++
++  { Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    instance_template->SetCallAsFunctionHandler(ConstructorCallback);
++    Local<Object> instance = instance_template->NewInstance();
++    context->Global()->Set(v8_str("obj"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    // Call the Object's constructor with a 32-bit signed integer.
++    value = CompileRun("(function() { var o = new obj(28); return o.a; })()");
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsInt32());
++    CHECK_EQ(28, value->Int32Value());
++
++    Local<Value> args1[] = { v8_num(28) };
++    Local<Value> value_obj1 = instance->CallAsConstructor(1, args1);
++    CHECK(value_obj1->IsObject());
++    Local<Object> object1 = Local<Object>::Cast(value_obj1);
++    value = object1->Get(v8_str("a"));
++    CHECK(value->IsInt32());
++    CHECK(!try_catch.HasCaught());
++    CHECK_EQ(28, value->Int32Value());
++
++    // Call the Object's constructor with a String.
++    value = CompileRun(
++        "(function() { var o = new obj('tipli'); return o.a; })()");
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsString());
++    String::AsciiValue string_value1(value->ToString());
++    CHECK_EQ("tipli", *string_value1);
++
++    Local<Value> args2[] = { v8_str("tipli") };
++    Local<Value> value_obj2 = instance->CallAsConstructor(1, args2);
++    CHECK(value_obj2->IsObject());
++    Local<Object> object2 = Local<Object>::Cast(value_obj2);
++    value = object2->Get(v8_str("a"));
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsString());
++    String::AsciiValue string_value2(value->ToString());
++    CHECK_EQ("tipli", *string_value2);
++
++    // Call the Object's constructor with a Boolean.
++    value = CompileRun("(function() { var o = new obj(true); return o.a; })()");
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsBoolean());
++    CHECK_EQ(true, value->BooleanValue());
++
++    Handle<Value> args3[] = { v8::Boolean::New(true) };
++    Local<Value> value_obj3 = instance->CallAsConstructor(1, args3);
++    CHECK(value_obj3->IsObject());
++    Local<Object> object3 = Local<Object>::Cast(value_obj3);
++    value = object3->Get(v8_str("a"));
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsBoolean());
++    CHECK_EQ(true, value->BooleanValue());
++
++    // Call the Object's constructor with undefined.
++    Handle<Value> args4[] = { v8::Undefined() };
++    Local<Value> value_obj4 = instance->CallAsConstructor(1, args4);
++    CHECK(value_obj4->IsObject());
++    Local<Object> object4 = Local<Object>::Cast(value_obj4);
++    value = object4->Get(v8_str("a"));
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsUndefined());
++
++    // Call the Object's constructor with null.
++    Handle<Value> args5[] = { v8::Null() };
++    Local<Value> value_obj5 = instance->CallAsConstructor(1, args5);
++    CHECK(value_obj5->IsObject());
++    Local<Object> object5 = Local<Object>::Cast(value_obj5);
++    value = object5->Get(v8_str("a"));
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsNull());
++  }
++
++  // Check exception handling when there is no constructor set for the Object.
++  { Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    Local<Object> instance = instance_template->NewInstance();
++    context->Global()->Set(v8_str("obj2"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    value = CompileRun("new obj2(28)");
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value1(try_catch.Exception());
++    CHECK_EQ("TypeError: object is not a function", *exception_value1);
++    try_catch.Reset();
++
++    Local<Value> args[] = { v8_num(29) };
++    value = instance->CallAsConstructor(1, args);
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value2(try_catch.Exception());
++    CHECK_EQ("TypeError: #<Object> is not a function", *exception_value2);
++    try_catch.Reset();
++  }
++
++  // Check the case when constructor throws exception.
++  { Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    instance_template->SetCallAsFunctionHandler(ThrowValue);
++    Local<Object> instance = instance_template->NewInstance();
++    context->Global()->Set(v8_str("obj3"), instance);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    value = CompileRun("new obj3(22)");
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value1(try_catch.Exception());
++    CHECK_EQ("22", *exception_value1);
++    try_catch.Reset();
++
++    Local<Value> args[] = { v8_num(23) };
++    value = instance->CallAsConstructor(1, args);
++    CHECK(try_catch.HasCaught());
++    String::AsciiValue exception_value2(try_catch.Exception());
++    CHECK_EQ("23", *exception_value2);
++    try_catch.Reset();
++  }
++
++  // Check whether constructor returns with an object or non-object.
++  { Local<FunctionTemplate> function_template =
++        FunctionTemplate::New(FakeConstructorCallback);
++    Local<Function> function = function_template->GetFunction();
++    Local<Object> instance1 = function;
++    context->Global()->Set(v8_str("obj4"), instance1);
++    v8::TryCatch try_catch;
++    Local<Value> value;
++    CHECK(!try_catch.HasCaught());
++
++    CHECK(instance1->IsObject());
++    CHECK(instance1->IsFunction());
++
++    value = CompileRun("new obj4(28)");
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsObject());
++
++    Local<Value> args1[] = { v8_num(28) };
++    value = instance1->CallAsConstructor(1, args1);
++    CHECK(!try_catch.HasCaught());
++    CHECK(value->IsObject());
++
++    Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    instance_template->SetCallAsFunctionHandler(FakeConstructorCallback);
++    Local<Object> instance2 = instance_template->NewInstance();
++    context->Global()->Set(v8_str("obj5"), instance2);
++    CHECK(!try_catch.HasCaught());
++
++    CHECK(instance2->IsObject());
++    CHECK(!instance2->IsFunction());
++
++    value = CompileRun("new obj5(28)");
++    CHECK(!try_catch.HasCaught());
++    CHECK(!value->IsObject());
++
++    Local<Value> args2[] = { v8_num(28) };
++    value = instance2->CallAsConstructor(1, args2);
++    CHECK(!try_catch.HasCaught());
++    CHECK(!value->IsObject());
++  }
++}
++
++
+ THREADED_TEST(FunctionDescriptorException) {
+   v8::HandleScope handle_scope;
+   LocalContext context;
+@@ -7028,9 +7222,8 @@ THREADED_TEST(CallAsFunction) {
+     CHECK(value.IsEmpty());
+     CHECK(try_catch.HasCaught());
+     String::AsciiValue exception_value1(try_catch.Exception());
+-    CHECK_EQ(*exception_value1,
+-             "TypeError: Property 'obj2' of object "
+-             "#<Object> is not a function");
++    CHECK_EQ("TypeError: Property 'obj2' of object #<Object> is not a function",
++             *exception_value1);
+     try_catch.Reset();
+
+     // Call an object without call-as-function handler through the API
+@@ -7040,7 +7233,7 @@ THREADED_TEST(CallAsFunction) {
+     CHECK(value.IsEmpty());
+     CHECK(try_catch.HasCaught());
+     String::AsciiValue exception_value2(try_catch.Exception());
+-    CHECK_EQ(*exception_value2, "TypeError: [object Object] is not a function");
++    CHECK_EQ("TypeError: [object Object] is not a function", *exception_value2);
+     try_catch.Reset();
+   }
+
+@@ -7057,14 +7250,14 @@ THREADED_TEST(CallAsFunction) {
+     value = CompileRun("obj3(22)");
+     CHECK(try_catch.HasCaught());
+     String::AsciiValue exception_value1(try_catch.Exception());
+-    CHECK_EQ(*exception_value1, "22");
++    CHECK_EQ("22", *exception_value1);
+     try_catch.Reset();
+
+     v8::Handle<Value> args[] = { v8_num(23) };
+     value = instance->CallAsFunction(instance, 1, args);
+     CHECK(try_catch.HasCaught());
+     String::AsciiValue exception_value2(try_catch.Exception());
+-    CHECK_EQ(*exception_value2, "23");
++    CHECK_EQ("23", *exception_value2);
+     try_catch.Reset();
+   }
+ }
+--
+1.7.2.3
+
diff --git a/src/v8/0011-QtScript-V8-Add-new-v8-api-to-check-if-a-value-is-an.patch b/src/v8/0011-QtScript-V8-Add-new-v8-api-to-check-if-a-value-is-an.patch
new file mode 100644
index 00000000000..9c0e68352f2
--- /dev/null
+++ b/src/v8/0011-QtScript-V8-Add-new-v8-api-to-check-if-a-value-is-an.patch
@@ -0,0 +1,63 @@
+From f22d0312faeb93ced8747d9aae8c6d77e11b4aba Mon Sep 17 00:00:00 2001
+From: Jedrzej Nowacki <jedrzej.nowacki@nokia.com>
+Date: Tue, 7 Dec 2010 11:56:42 +0100
+Subject: [PATCH 11/13] QtScript/V8: Add new v8 api to check if a value is an error.
+
+New function v8::Value::IsError was created.
+
+This API is experimental and added only for the purposes of our
+research.
+---
+ include/v8.h |    5 +++++
+ src/api.cc   |    6 ++++++
+ src/heap.h   |    1 +
+ 3 files changed, 12 insertions(+), 0 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 84462b5..08b0ec2 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -937,6 +937,11 @@ class Value : public Data {
+    */
+   V8EXPORT bool IsRegExp() const;
+
++  /**
++   * Returns true if this value is an Error.
++   */
++  V8EXPORT bool IsError() const;
++
+   V8EXPORT Local<Boolean> ToBoolean() const;
+   V8EXPORT Local<Number> ToNumber() const;
+   V8EXPORT Local<String> ToString() const;
+diff --git a/src/api.cc b/src/api.cc
+index 1a585d6..bd435eb 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -2108,6 +2108,12 @@ bool Value::IsRegExp() const {
+   return obj->IsJSRegExp();
+ }
+
++bool Value::IsError() const {
++  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsError()")) return false;
++  i::Handle<i::Object> obj = Utils::OpenHandle(this);
++  return obj->HasSpecificClassOf(HEAP->Error_symbol());
++}
++
+
+ Local<String> Value::ToString() const {
+   i::Handle<i::Object> obj = Utils::OpenHandle(this);
+diff --git a/src/heap.h b/src/heap.h
+index 8cbf378..db90bb9 100644
+--- a/src/heap.h
++++ b/src/heap.h
+@@ -169,6 +169,7 @@ inline Heap* _inline_get_heap_();
+   V(string_symbol, "string")                                             \
+   V(String_symbol, "String")                                             \
+   V(Date_symbol, "Date")                                                 \
++  V(Error_symbol, "Error")                                               \
+   V(this_symbol, "this")                                                 \
+   V(to_string_symbol, "toString")                                        \
+   V(char_at_symbol, "CharAt")                                            \
+--
+1.7.2.3
+
diff --git a/src/v8/0012-Add-IsCallable-method-for-Object-in-the-API.patch b/src/v8/0012-Add-IsCallable-method-for-Object-in-the-API.patch
new file mode 100644
index 00000000000..77589c8af36
--- /dev/null
+++ b/src/v8/0012-Add-IsCallable-method-for-Object-in-the-API.patch
@@ -0,0 +1,116 @@
+From 472c04c9e7a64e8734c76d2cf97a7cc5b773b788 Mon Sep 17 00:00:00 2001
+From: ager@chromium.org <ager@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
+Date: Mon, 9 May 2011 15:24:48 +0000
+Subject: [PATCH 12/13] Add IsCallable method for Object in the API
+
+Patch by Peter Varga.
+
+BUG=none
+TEST=cctest/test-api/CallableObject
+
+Review URL: http://codereview.chromium.org/6964005
+
+git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@7828 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
+---
+ include/v8.h            |    7 +++++++
+ src/api.cc              |   11 +++++++++++
+ test/cctest/test-api.cc |   43 +++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 61 insertions(+), 0 deletions(-)
+
+diff --git a/include/v8.h b/include/v8.h
+index 08b0ec2..4194d4a 100644
+--- a/include/v8.h
++++ b/include/v8.h
+@@ -1763,6 +1763,13 @@ class Object : public Value {
+   V8EXPORT int GetIndexedPropertiesExternalArrayDataLength();
+
+   /**
++   * Checks whether a callback is set by the
++   * ObjectTemplate::SetCallAsFunctionHandler method.
++   * When an Object is callable this method returns true.
++   */
++  V8EXPORT bool IsCallable();
++
++  /**
+    * Call an Object as a function if a callback is set by the
+    * ObjectTemplate::SetCallAsFunctionHandler method.
+    */
+diff --git a/src/api.cc b/src/api.cc
+index bd435eb..a5a637f 100644
+--- a/src/api.cc
++++ b/src/api.cc
+@@ -3265,6 +3265,17 @@ int v8::Object::GetIndexedPropertiesExternalArrayDataLength() {
+ }
+
+
++bool v8::Object::IsCallable() {
++  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
++  ON_BAILOUT(isolate, "v8::Object::IsCallable()", return false);
++  ENTER_V8(isolate);
++  i::HandleScope scope(isolate);
++  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
++  if (obj->IsJSFunction()) return true;
++  return i::Execution::GetFunctionDelegate(obj)->IsJSFunction();
++}
++
++
+ Local<v8::Value> Object::CallAsFunction(v8::Handle<v8::Object> recv, int argc,
+                                         v8::Handle<v8::Value> argv[]) {
+   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
+index 1334f63..45db5a1 100644
+--- a/test/cctest/test-api.cc
++++ b/test/cctest/test-api.cc
+@@ -7263,6 +7263,49 @@ THREADED_TEST(CallAsFunction) {
+ }
+
+
++// Check whether a non-function object is callable.
++THREADED_TEST(CallableObject) {
++  v8::HandleScope scope;
++  LocalContext context;
++
++  { Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    instance_template->SetCallAsFunctionHandler(call_as_function);
++    Local<Object> instance = instance_template->NewInstance();
++    v8::TryCatch try_catch;
++
++    CHECK(instance->IsCallable());
++    CHECK(!try_catch.HasCaught());
++  }
++
++  { Local<ObjectTemplate> instance_template = ObjectTemplate::New();
++    Local<Object> instance = instance_template->NewInstance();
++    v8::TryCatch try_catch;
++
++    CHECK(!instance->IsCallable());
++    CHECK(!try_catch.HasCaught());
++  }
++
++  { Local<FunctionTemplate> function_template =
++        FunctionTemplate::New(call_as_function);
++    Local<Function> function = function_template->GetFunction();
++    Local<Object> instance = function;
++    v8::TryCatch try_catch;
++
++    CHECK(instance->IsCallable());
++    CHECK(!try_catch.HasCaught());
++  }
++
++  { Local<FunctionTemplate> function_template = FunctionTemplate::New();
++    Local<Function> function = function_template->GetFunction();
++    Local<Object> instance = function;
++    v8::TryCatch try_catch;
++
++    CHECK(instance->IsCallable());
++    CHECK(!try_catch.HasCaught());
++  }
++}
++
++
+ static int CountHandles() {
+   return v8::HandleScope::NumberOfHandles();
+ }
+--
+1.7.2.3
+
diff --git a/src/v8/0013-Remove-execute-flag-from-v8-debug.h.patch b/src/v8/0013-Remove-execute-flag-from-v8-debug.h.patch
new file mode 100644
index 00000000000..6bad561273d
--- /dev/null
+++ b/src/v8/0013-Remove-execute-flag-from-v8-debug.h.patch
@@ -0,0 +1,15 @@
+From dc2cad4f8fc88c52fcea09b8d0262d35cd32dc44 Mon Sep 17 00:00:00 2001
+From: Aaron Kennedy <aaron.kennedy@nokia.com>
+Date: Thu, 25 Aug 2011 11:09:58 +1000
+Subject: [PATCH 13/13] Remove execute flag from v8-debug.h
+
+---
+ 0 files changed, 0 insertions(+), 0 deletions(-)
+ mode change 100755 => 100644 include/v8-debug.h
+
+diff --git a/include/v8-debug.h b/include/v8-debug.h
+old mode 100755
+new mode 100644
+--
+1.7.2.3
+
diff --git a/src/v8/README b/src/v8/README
new file mode 100644
index 00000000000..2dc39705aaa
--- /dev/null
+++ b/src/v8/README
@@ -0,0 +1 @@
+These patches apply cleanly against v8 at 2eaa4b29586fdbd5d41f7b7d9e72ecca6d53dbd2
diff --git a/src/v8/v8.pri b/src/v8/v8.pri
new file mode 100644
index 00000000000..4d55bbfd5af
--- /dev/null
+++ b/src/v8/v8.pri
@@ -0,0 +1,260 @@
+equals(QT_ARCH, x86_64)|contains(CONFIG, x86_64):CONFIG += arch_x86_64
+else:equals(QT_ARCH, "i386"):CONFIG += arch_i386
+else:equals(QT_ARCH, "arm"):CONFIG += arch_arm
+else:equals(QMAKE_HOST.arch, armv7l):CONFIG += arch_arm
+else:equals(QMAKE_HOST.arch, x86_64):CONFIG += arch_x86_64
+else:equals(QMAKE_HOST.arch, x86):CONFIG += arch_i386
+else:equals(QMAKE_HOST.arch, i386):CONFIG += arch_i386
+else:equals(QMAKE_HOST.arch, i686):CONFIG += arch_i386
+else:error("Couldn't detect supported architecture ($$QMAKE_HOST.arch/$$QT_ARCH). Currently supported architectures are: x64, x86 and arm")
+
+include($$PWD/v8base.pri)
+
+V8_GENERATED_SOURCES_DIR = generated
+
+!contains(QT_CONFIG, static): DEFINES += V8_SHARED BUILDING_V8_SHARED
+
+# this maybe removed in future
+DEFINES += ENABLE_DEBUGGER_SUPPORT
+
+# this is needed by crankshaft ( http://code.google.com/p/v8/issues/detail?id=1271 )
+DEFINES += ENABLE_VMSTATE_TRACKING ENABLE_LOGGING_AND_PROFILING
+
+CONFIG(debug, debug|release) {
+    DEFINES += DEBUG V8_ENABLE_CHECKS OBJECT_PRINT ENABLE_DISASSEMBLER
+} else {
+    DEFINES += NDEBUG
+}
+
+V8SRC = $$V8DIR/src
+
+INCLUDEPATH += \
+    $$V8SRC
+
+SOURCES += \
+    $$V8SRC/accessors.cc \
+    $$V8SRC/allocation.cc \
+    $$V8SRC/api.cc \
+    $$V8SRC/assembler.cc \
+    $$V8SRC/ast.cc \
+    $$V8SRC/atomicops_internals_x86_gcc.cc \
+    $$V8SRC/bignum.cc \
+    $$V8SRC/bignum-dtoa.cc \
+    $$V8SRC/bootstrapper.cc \
+    $$V8SRC/builtins.cc \
+    $$V8SRC/cached-powers.cc \
+    $$V8SRC/checks.cc \
+    $$V8SRC/circular-queue.cc \
+    $$V8SRC/code-stubs.cc \
+    $$V8SRC/codegen.cc \
+    $$V8SRC/compilation-cache.cc \
+    $$V8SRC/compiler.cc \
+    $$V8SRC/contexts.cc \
+    $$V8SRC/conversions.cc \
+    $$V8SRC/counters.cc \
+    $$V8SRC/cpu-profiler.cc \
+    $$V8SRC/data-flow.cc \
+    $$V8SRC/dateparser.cc \
+    $$V8SRC/debug-agent.cc \
+    $$V8SRC/debug.cc \
+    $$V8SRC/deoptimizer.cc \
+    $$V8SRC/disassembler.cc \
+    $$V8SRC/diy-fp.cc \
+    $$V8SRC/dtoa.cc \
+    $$V8SRC/execution.cc \
+    $$V8SRC/factory.cc \
+    $$V8SRC/flags.cc \
+    $$V8SRC/frame-element.cc \
+    $$V8SRC/frames.cc \
+    $$V8SRC/full-codegen.cc \
+    $$V8SRC/func-name-inferrer.cc \
+    $$V8SRC/gdb-jit.cc \
+    $$V8SRC/global-handles.cc \
+    $$V8SRC/fast-dtoa.cc \
+    $$V8SRC/fixed-dtoa.cc \
+    $$V8SRC/handles.cc \
+    $$V8SRC/hashmap.cc \
+    $$V8SRC/heap-profiler.cc \
+    $$V8SRC/heap.cc \
+    $$V8SRC/hydrogen.cc \
+    $$V8SRC/hydrogen-instructions.cc \
+    $$V8SRC/ic.cc \
+    $$V8SRC/inspector.cc \
+    $$V8SRC/interpreter-irregexp.cc \
+    $$V8SRC/isolate.cc \
+    $$V8SRC/jsregexp.cc \
+    $$V8SRC/lithium-allocator.cc \
+    $$V8SRC/lithium.cc \
+    $$V8SRC/liveedit.cc \
+    $$V8SRC/liveobjectlist.cc \
+    $$V8SRC/log-utils.cc \
+    $$V8SRC/log.cc \
+    $$V8SRC/mark-compact.cc \
+    $$V8SRC/messages.cc \
+    $$V8SRC/objects.cc \
+    $$V8SRC/objects-printer.cc \
+    $$V8SRC/objects-visiting.cc \
+    $$V8SRC/parser.cc \
+    $$V8SRC/preparser.cc \
+    $$V8SRC/preparse-data.cc \
+    $$V8SRC/profile-generator.cc \
+    $$V8SRC/property.cc \
+    $$V8SRC/regexp-macro-assembler-irregexp.cc \
+    $$V8SRC/regexp-macro-assembler.cc \
+    $$V8SRC/regexp-stack.cc \
+    $$V8SRC/rewriter.cc \
+    $$V8SRC/runtime.cc \
+    $$V8SRC/runtime-profiler.cc \
+    $$V8SRC/safepoint-table.cc \
+    $$V8SRC/scanner-base.cc \
+    $$V8SRC/scanner.cc \
+    $$V8SRC/scopeinfo.cc \
+    $$V8SRC/scopes.cc \
+    $$V8SRC/serialize.cc \
+    $$V8SRC/snapshot-common.cc \
+    $$V8SRC/spaces.cc \
+    $$V8SRC/string-search.cc \
+    $$V8SRC/string-stream.cc \
+    $$V8SRC/strtod.cc \
+    $$V8SRC/stub-cache.cc \
+    $$V8SRC/token.cc \
+    $$V8SRC/top.cc \
+    $$V8SRC/type-info.cc \
+    $$V8SRC/unicode.cc \
+    $$V8SRC/utils.cc \
+    $$V8SRC/v8-counters.cc \
+    $$V8SRC/v8.cc \
+    $$V8SRC/v8threads.cc \
+    $$V8SRC/variables.cc \
+    $$V8SRC/version.cc \
+    $$V8SRC/zone.cc \
+    $$V8SRC/extensions/gc-extension.cc \
+    $$V8SRC/extensions/externalize-string-extension.cc
+
+SOURCES += \
+    $$V8SRC/snapshot-empty.cc \
+
+arch_arm {
+DEFINES += V8_TARGET_ARCH_ARM
+SOURCES += \
+    $$V8SRC/arm/builtins-arm.cc \
+    $$V8SRC/arm/code-stubs-arm.cc \
+    $$V8SRC/arm/codegen-arm.cc \
+    $$V8SRC/arm/constants-arm.cc \
+    $$V8SRC/arm/cpu-arm.cc \
+    $$V8SRC/arm/debug-arm.cc \
+    $$V8SRC/arm/deoptimizer-arm.cc \
+    $$V8SRC/arm/disasm-arm.cc \
+    $$V8SRC/arm/frames-arm.cc \
+    $$V8SRC/arm/full-codegen-arm.cc \
+    $$V8SRC/arm/ic-arm.cc \
+    $$V8SRC/arm/lithium-arm.cc \
+    $$V8SRC/arm/lithium-codegen-arm.cc \
+    $$V8SRC/arm/lithium-gap-resolver-arm.cc \
+    $$V8SRC/arm/macro-assembler-arm.cc \
+    $$V8SRC/arm/regexp-macro-assembler-arm.cc \
+    $$V8SRC/arm/stub-cache-arm.cc \
+    $$V8SRC/arm/assembler-arm.cc
+}
+
+arch_i386 {
+DEFINES += V8_TARGET_ARCH_IA32
+SOURCES += \
+    $$V8SRC/ia32/assembler-ia32.cc \
+    $$V8SRC/ia32/builtins-ia32.cc \
+    $$V8SRC/ia32/code-stubs-ia32.cc \
+    $$V8SRC/ia32/codegen-ia32.cc \
+    $$V8SRC/ia32/cpu-ia32.cc \
+    $$V8SRC/ia32/debug-ia32.cc \
+    $$V8SRC/ia32/deoptimizer-ia32.cc \
+    $$V8SRC/ia32/disasm-ia32.cc \
+    $$V8SRC/ia32/frames-ia32.cc \
+    $$V8SRC/ia32/full-codegen-ia32.cc \
+    $$V8SRC/ia32/ic-ia32.cc \
+    $$V8SRC/ia32/lithium-codegen-ia32.cc \
+    $$V8SRC/ia32/lithium-gap-resolver-ia32.cc \
+    $$V8SRC/ia32/lithium-ia32.cc \
+    $$V8SRC/ia32/macro-assembler-ia32.cc \
+    $$V8SRC/ia32/regexp-macro-assembler-ia32.cc \
+    $$V8SRC/ia32/stub-cache-ia32.cc
+}
+
+# FIXME Should we use QT_CONFIG instead? What about 32 bit Macs?
+arch_x86_64 {
+DEFINES += V8_TARGET_ARCH_X64
+SOURCES += \
+    $$V8SRC/x64/assembler-x64.cc \
+    $$V8SRC/x64/builtins-x64.cc \
+    $$V8SRC/x64/code-stubs-x64.cc \
+    $$V8SRC/x64/codegen-x64.cc \
+    $$V8SRC/x64/cpu-x64.cc \
+    $$V8SRC/x64/debug-x64.cc \
+    $$V8SRC/x64/deoptimizer-x64.cc \
+    $$V8SRC/x64/disasm-x64.cc \
+    $$V8SRC/x64/frames-x64.cc \
+    $$V8SRC/x64/full-codegen-x64.cc \
+    $$V8SRC/x64/ic-x64.cc \
+    $$V8SRC/x64/lithium-codegen-x64.cc \
+    $$V8SRC/x64/lithium-gap-resolver-x64.cc \
+    $$V8SRC/x64/lithium-x64.cc \
+    $$V8SRC/x64/macro-assembler-x64.cc \
+    $$V8SRC/x64/regexp-macro-assembler-x64.cc \
+    $$V8SRC/x64/stub-cache-x64.cc
+}
+
+unix:!symbian:!macx {
+SOURCES += \
+    $$V8SRC/platform-linux.cc \
+    $$V8SRC/platform-posix.cc
+}
+
+#os:macos
+macx {
+SOURCES += \
+    $$V8SRC/platform-macos.cc \
+    $$V8SRC/platform-posix.cc
+}
+
+win32 {
+SOURCES += \
+    $$V8SRC/platform-win32.cc
+LIBS += Ws2_32.lib Winmm.lib
+win32-msvc*: QMAKE_CXXFLAGS += -wd4100 -wd 4291 -wd4351 -wd4355 -wd4800
+win32-msvc*:arch_i386: DEFINES += _USE_32BIT_TIME_T
+}
+
+#mode:debug
+CONFIG(debug) {
+    SOURCES += \
+        $$V8SRC/objects-debug.cc \
+        $$V8SRC/prettyprinter.cc \
+        $$V8SRC/regexp-macro-assembler-tracer.cc
+}
+
+V8_LIBRARY_FILES = \
+    $$V8SRC/runtime.js \
+    $$V8SRC/v8natives.js \
+    $$V8SRC/array.js \
+    $$V8SRC/string.js \
+    $$V8SRC/uri.js \
+    $$V8SRC/math.js \
+    $$V8SRC/messages.js \
+    $$V8SRC/apinatives.js \
+    $$V8SRC/date.js \
+    $$V8SRC/regexp.js \
+    $$V8SRC/json.js \
+    $$V8SRC/liveedit-debugger.js \
+    $$V8SRC/mirror-debugger.js \
+    $$V8SRC/debug-debugger.js
+
+v8_js2c.commands = python $$V8DIR/tools/js2c.py $$V8_GENERATED_SOURCES_DIR/libraries.cpp $$V8_GENERATED_SOURCES_DIR/libraries-empty.cpp CORE
+v8_js2c.commands += $$V8SRC/macros.py ${QMAKE_FILE_IN}
+v8_js2c.output = $$V8_GENERATED_SOURCES_DIR/libraries.cpp
+v8_js2c.input = V8_LIBRARY_FILES
+v8_js2c.variable_out = SOURCES
+v8_js2c.dependency_type = TYPE_C
+v8_js2c.depends = $$V8DIR/tools/js2c.py $$V8SRC/macros.py
+v8_js2c.CONFIG += combine
+v8_js2c.name = generating[v8] ${QMAKE_FILE_IN}
+silent:v8_js2c.commands = @echo generating[v8] ${QMAKE_FILE_IN} && $$v8_js2c.commands
+QMAKE_EXTRA_COMPILERS += v8_js2c
diff --git a/src/v8/v8.pro b/src/v8/v8.pro
new file mode 100644
index 00000000000..eb14ca9a193
--- /dev/null
+++ b/src/v8/v8.pro
@@ -0,0 +1,24 @@
+load(qt_module)
+
+TARGET     = QtV8
+QPRO_PWD   = $$PWD
+QT         =
+
+CONFIG += module
+MODULE_PRI = ../modules/qt_v8.pri
+
+win32-msvc*|win32-icc:QMAKE_LFLAGS += /BASE:0x66000000
+
+load(qt_module_config)
+
+# Remove includepaths that were added by qt_module_config.
+# These cause compilation of V8 to fail because they appear before
+# 3rdparty/v8/src; 3rdparty/v8/src/v8.h will then be "shadowed" by
+# the public v8.h API header (they are not the same!).
+INCLUDEPATH -= $$MODULE_PRIVATE_INCLUDES
+INCLUDEPATH -= $$MODULE_PRIVATE_INCLUDES/$$TARGET
+INCLUDEPATH -= $$MODULE_INCLUDES $$MODULE_INCLUDES/..
+
+HEADERS += $$QT_SOURCE_TREE/src/v8/qtv8version.h
+
+include(v8.pri)
diff --git a/src/v8/v8base.pri b/src/v8/v8base.pri
new file mode 100644
index 00000000000..f0d7c00451a
--- /dev/null
+++ b/src/v8/v8base.pri
@@ -0,0 +1,19 @@
+V8DIR = $$(V8DIR)
+isEmpty(V8DIR) {
+    V8DIR = $$PWD/../3rdparty/v8
+} else {
+    message(using external V8 from $$V8DIR)
+}
+
+*-g++*: {
+    QMAKE_CFLAGS_WARN_ON += -Wno-unused-parameter
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-parameter
+
+    # mksnapshot hangs if gcc 4.5 is used
+    # for reference look at http://code.google.com/p/v8/issues/detail?id=884
+    equals(QT_GCC_MAJOR_VERSION, 4): equals(QT_GCC_MINOR_VERSION, 5) {
+      message(because of a bug in gcc / v8 we need to add -fno-strict-aliasing)
+      QMAKE_CFLAGS += -fno-strict-aliasing
+      QMAKE_CXXFLAGS += -fno-strict-aliasing
+    }
+}
diff --git a/sync.profile b/sync.profile
index c830612cd3f..e0d23ac3bfa 100644
--- a/sync.profile
+++ b/sync.profile
@@ -4,6 +4,7 @@
     "QtPrintSupport" => "$basedir/src/printsupport",
     "QtOpenGL" => "$basedir/src/opengl",
     "QtCore" => "$basedir/src/corelib",
+    "QtV8" => "$basedir/src/v8",
     "QtXml" => "$basedir/src/xml",
     "QtSql" => "$basedir/src/sql",
     "QtNetwork" => "$basedir/src/network",
@@ -14,6 +15,10 @@
     "QtPlatformSupport" => "$basedir/src/platformsupport",
 );
 %moduleheaders = ( # restrict the module headers to those found in relative path
+    "QtV8" => "../3rdparty/v8/include",
+);
+@allmoduleheadersprivate = (
+    "QtV8"
 );
 %classnames = (
     "qglobal.h" => "QtGlobal",
@@ -38,6 +43,7 @@
     "qtopenvgversion.h" => "QtOpenVGVersion",
     "qtsqlversion.h" => "QtSqlVersion",
     "qttestversion.h" => "QtTestVersion",
+    "qtv8version.h" => "QtV8Version",
     "qtxmlversion.h" => "QtXmlVersion",
 );
 %mastercontent = (
@@ -61,6 +67,7 @@
     "QtOpenGL" => "$basedir/src/modules/qt_opengl.pri",
     "QtSql" => "$basedir/src/modules/qt_sql.pri",
     "QtTest" => "$basedir/src/modules/qt_testlib.pri",
+    "QtV8" => "$basedir/src/modules/qt_v8.pri",
     "QtXml" => "$basedir/src/modules/qt_xml.pri",
     "QtUiTools" => "$basedir/src/modules/qt_uitools.pri",
     "QtDesigner" => "$basedir/src/modules/qt_uilib.pri",
diff --git a/tests/auto/auto.pro b/tests/auto/auto.pro
index 02e8b5bebba..fc51280c356 100644
--- a/tests/auto/auto.pro
+++ b/tests/auto/auto.pro
@@ -11,3 +11,4 @@ SUBDIRS += \
 !cross_compile:                             SUBDIRS += host.pro
 contains(QT_CONFIG, opengl):                SUBDIRS += opengl.pro
 unix:!embedded:contains(QT_CONFIG, dbus):   SUBDIRS += dbus.pro
+contains(QT_CONFIG, v8):                    SUBDIRS += v8.pro
diff --git a/tests/auto/qmatrixnxn/tst_qmatrixnxn.cpp b/tests/auto/qmatrixnxn/tst_qmatrixnxn.cpp
index 1b4d770ac6a..98a559af85c 100644
--- a/tests/auto/qmatrixnxn/tst_qmatrixnxn.cpp
+++ b/tests/auto/qmatrixnxn/tst_qmatrixnxn.cpp
@@ -1834,6 +1834,18 @@ void tst_QMatrixNxN::inverted4x4_data()
     QTest::newRow("invertible")
         << (void *)invertible.v << (void *)inverted.v << true;
 
+    static Matrix4 const invertible2 = {
+        {1.0f, 2.0f, 4.0f, 2.0f,
+         8.0f, 3.0f, 5.0f, 3.0f,
+         6.0f, 7.0f, 9.0f, 4.0f,
+         0.0f, 0.0f, 0.0f, 1.0f}
+    };
+    static Matrix4 inverted2;
+    m4Inverse(invertible2, inverted2);
+
+    QTest::newRow("invertible2")
+        << (void *)invertible2.v << (void *)inverted2.v << true;
+
     static Matrix4 const translate = {
         {1.0f, 0.0f, 0.0f, 2.0f,
          0.0f, 1.0f, 0.0f, 3.0f,
@@ -1907,12 +1919,12 @@ void tst_QMatrixNxN::orthonormalInverse4x4()
     m2.rotate(45.0, 1.0, 0.0, 0.0);
     m2.translate(10.0, 0.0, 0.0);
 
-    // Use optimize() to drop the internal flags that
+    // Use operator() to drop the internal flags that
     // mark the matrix as orthonormal.  This will force inverted()
     // to compute m3.inverted() the long way.  We can then compare
     // the result to what the faster algorithm produces on m2.
     QMatrix4x4 m3 = m2;
-    m3.optimize();
+    m3(0, 0);
     bool invertible;
     QVERIFY(qFuzzyCompare(m2.inverted(&invertible), m3.inverted()));
     QVERIFY(invertible);
@@ -1920,7 +1932,7 @@ void tst_QMatrixNxN::orthonormalInverse4x4()
     QMatrix4x4 m4;
     m4.rotate(45.0, 0.0, 1.0, 0.0);
     QMatrix4x4 m5 = m4;
-    m5.optimize();
+    m5(0, 0);
     QVERIFY(qFuzzyCompare(m4.inverted(), m5.inverted()));
 
     QMatrix4x4 m6;
@@ -1928,7 +1940,7 @@ void tst_QMatrixNxN::orthonormalInverse4x4()
     m1.translate(-20.0, 20.0, 15.0);
     m1.rotate(25, 1.0, 0.0, 0.0);
     QMatrix4x4 m7 = m6;
-    m7.optimize();
+    m7(0, 0);
     QVERIFY(qFuzzyCompare(m6.inverted(), m7.inverted()));
 }
 
@@ -2449,6 +2461,11 @@ void tst_QMatrixNxN::normalMatrix_data()
          0.0f, 7.0f, 0.0f, 5.0f,
          0.0f, 0.0f, 9.0f, -3.0f,
          0.0f, 0.0f, 0.0f, 1.0f};
+    static qreal const rotateValues[16] =
+        {0.0f, 0.0f, 1.0f, 0.0f,
+         1.0f, 0.0f, 0.0f, 0.0f,
+         0.0f, 1.0f, 0.0f, 0.0f,
+         0.0f, 0.0f, 0.0f, 1.0f};
     static qreal const nullScaleValues1[16] =
         {0.0f, 0.0f, 0.0f, 4.0f,
          0.0f, 7.0f, 0.0f, 5.0f,
@@ -2468,6 +2485,7 @@ void tst_QMatrixNxN::normalMatrix_data()
     QTest::newRow("translate") << (void *)translateValues;
     QTest::newRow("scale") << (void *)scaleValues;
     QTest::newRow("both") << (void *)bothValues;
+    QTest::newRow("rotate") << (void *)rotateValues;
     QTest::newRow("null scale 1") << (void *)nullScaleValues1;
     QTest::newRow("null scale 2") << (void *)nullScaleValues2;
     QTest::newRow("null scale 3") << (void *)nullScaleValues3;
@@ -2844,11 +2862,13 @@ void tst_QMatrixNxN::convertGeneric()
 
 // Copy of "flagBits" in qmatrix4x4.h.
 enum {
-    Identity        = 0x0001,   // Identity matrix
-    General         = 0x0002,   // General matrix, unknown contents
-    Translation     = 0x0004,   // Contains a simple translation
-    Scale           = 0x0008,   // Contains a simple scale
-    Rotation        = 0x0010    // Contains a simple rotation
+    Identity        = 0x0000, // Identity matrix
+    Translation     = 0x0001, // Contains a translation
+    Scale           = 0x0002, // Contains a scale
+    Rotation2D      = 0x0004, // Contains a rotation about the Z axis
+    Rotation        = 0x0008, // Contains an arbitrary rotation
+    Perspective     = 0x0010, // Last row is different from (0, 0, 0, 1)
+    General         = 0x001f  // General matrix, unknown contents
 };
 
 // Structure that allows direct access to "flagBits" for testing.
@@ -2886,17 +2906,73 @@ void tst_QMatrixNxN::optimize_data()
         0.0f, 0.0f, 1.0f, 4.0f,
         0.0f, 0.0f, 0.0f, 1.0f
     };
-    QTest::newRow("scale")
+    QTest::newRow("translate")
         << (void *)translateValues << (int)Translation;
 
-    static qreal bothValues[16] = {
+    static qreal scaleTranslateValues[16] = {
         1.0f, 0.0f, 0.0f, 2.0f,
         0.0f, 2.0f, 0.0f, 0.0f,
         0.0f, 0.0f, 1.0f, 4.0f,
         0.0f, 0.0f, 0.0f, 1.0f
     };
-    QTest::newRow("both")
-        << (void *)bothValues << (int)(Scale | Translation);
+    QTest::newRow("scaleTranslate")
+        << (void *)scaleTranslateValues << (int)(Scale | Translation);
+
+    static qreal rotateValues[16] = {
+        0.0f, 1.0f, 0.0f, 0.0f,
+        -1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("rotate")
+        << (void *)rotateValues << (int)Rotation2D;
+
+    // Left-handed system, not a simple rotation.
+    static qreal scaleRotateValues[16] = {
+        0.0f, 1.0f, 0.0f, 0.0f,
+        1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("scaleRotate")
+        << (void *)scaleRotateValues << (int)(Scale | Rotation2D);
+
+    static qreal matrix2x2Values[16] = {
+        1.0f, 2.0f, 0.0f, 0.0f,
+        8.0f, 3.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 9.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("matrix2x2")
+        << (void *)matrix2x2Values << (int)(Scale | Rotation2D);
+
+    static qreal matrix3x3Values[16] = {
+        1.0f, 2.0f, 4.0f, 0.0f,
+        8.0f, 3.0f, 5.0f, 0.0f,
+        6.0f, 7.0f, 9.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("matrix3x3")
+        << (void *)matrix3x3Values << (int)(Scale | Rotation2D | Rotation);
+
+    static qreal rotateTranslateValues[16] = {
+        0.0f, 1.0f, 0.0f, 1.0f,
+        -1.0f, 0.0f, 0.0f, 2.0f,
+        0.0f, 0.0f, 1.0f, 3.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("rotateTranslate")
+        << (void *)rotateTranslateValues << (int)(Translation | Rotation2D);
+
+    // Left-handed system, not a simple rotation.
+    static qreal scaleRotateTranslateValues[16] = {
+        0.0f, 1.0f, 0.0f, 1.0f,
+        1.0f, 0.0f, 0.0f, 2.0f,
+        0.0f, 0.0f, 1.0f, 3.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+    };
+    QTest::newRow("scaleRotateTranslate")
+        << (void *)scaleRotateTranslateValues << (int)(Translation | Scale | Rotation2D);
 
     static qreal belowValues[16] = {
         1.0f, 0.0f, 0.0f, 0.0f,
@@ -3240,7 +3316,6 @@ void tst_QMatrixNxN::mapVector()
     QFETCH(void *, mValues);
 
     QMatrix4x4 m1((const qreal *)mValues);
-    m1.optimize();
 
     QVector3D v(3.5f, -1.0f, 2.5f);
 
@@ -3250,10 +3325,15 @@ void tst_QMatrixNxN::mapVector()
          v.x() * m1(2, 0) + v.y() * m1(2, 1) + v.z() * m1(2, 2));
 
     QVector3D actual = m1.mapVector(v);
+    m1.optimize();
+    QVector3D actual2 = m1.mapVector(v);
 
     QVERIFY(fuzzyCompare(actual.x(), expected.x()));
     QVERIFY(fuzzyCompare(actual.y(), expected.y()));
     QVERIFY(fuzzyCompare(actual.z(), expected.z()));
+    QVERIFY(fuzzyCompare(actual2.x(), expected.x()));
+    QVERIFY(fuzzyCompare(actual2.y(), expected.y()));
+    QVERIFY(fuzzyCompare(actual2.z(), expected.z()));
 }
 
 class tst_QMatrixNxN4x4Properties : public QObject
diff --git a/tests/auto/v8.pro b/tests/auto/v8.pro
new file mode 100644
index 00000000000..226ff7b1186
--- /dev/null
+++ b/tests/auto/v8.pro
@@ -0,0 +1,3 @@
+TEMPLATE = subdirs
+SUBDIRS = \
+    v8
diff --git a/tests/auto/v8/Makefile.nonqt b/tests/auto/v8/Makefile.nonqt
new file mode 100644
index 00000000000..ded1ba3a749
--- /dev/null
+++ b/tests/auto/v8/Makefile.nonqt
@@ -0,0 +1,16 @@
+V8PATH = ../../../src/3rdparty/v8
+V8LIBPATH = $(V8PATH)
+V8INCPATH = $(V8PATH)/include
+SOURCES = v8main.cpp v8test.cpp
+
+release-m32:
+	g++ -o v8test_release_m32 -m32 -O2 -I$(V8INCPATH) $(SOURCES) -lpthread -L$(V8LIBPATH) -lv8
+
+debug-m32:
+	g++ -o v8test_debug_m32 -m32 -g -I$(V8INCPATH) $(SOURCES) -lpthread -L$(V8LIBPATH) -lv8_g
+
+release:
+	g++ -o v8test_release -O2 -I$(V8INCPATH) $(SOURCES) -lpthread -L$(V8LIBPATH) -lv8
+
+debug:
+	g++ -o v8test_debug -g -I$(V8INCPATH) $(SOURCES) -lpthread -L$(V8LIBPATH) -lv8_g
diff --git a/tests/auto/v8/README.txt b/tests/auto/v8/README.txt
new file mode 100644
index 00000000000..097c4590366
--- /dev/null
+++ b/tests/auto/v8/README.txt
@@ -0,0 +1,13 @@
+The v8 tests are actually implemented in v8test.[h|cpp].  There are also QtTest
+(tst_v8.cpp) and non-Qt (v8main.cpp) stubs provided to run these tests.  This
+is done to allow the tests to be run both in the Qt CI system, and manually
+without a build of Qt.  The latter is necessary to run them against more exotic
+build of V8, like the ARM simulator.
+
+To build the non-Qt version of the tests, first build a debug or release V8
+library under src/3rdparty/v8 using scons, and then use the Makefile.nonqt
+makefile selecting one of the following targets:
+    release: Build the tests with -O2 and link against libv8
+    debug: Build the tests with -g and link against libv8_g
+    release-m32: Build the tests with -O2 -m32 and link against libv8
+    debug-m32: Build the tests with -g -m32 and link against libv8_g
diff --git a/tests/auto/v8/tst_v8.cpp b/tests/auto/v8/tst_v8.cpp
new file mode 100644
index 00000000000..4ff80067c52
--- /dev/null
+++ b/tests/auto/v8/tst_v8.cpp
@@ -0,0 +1,80 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <qtest.h>
+#include <private/v8.h>
+#include "v8test.h"
+
+using namespace v8;
+
+class tst_v8 : public QObject
+{
+    Q_OBJECT
+public:
+    tst_v8() {}
+
+private slots:
+    void initTestCase() {}
+    void cleanupTestCase() {}
+
+    void eval();
+    void userobjectcompare();
+};
+
+void tst_v8::eval()
+{
+    QVERIFY(v8test_eval());
+}
+
+void tst_v8::userobjectcompare()
+{
+    QVERIFY(v8test_userobjectcompare());
+}
+
+int main(int argc, char *argv[])
+{
+    V8::SetFlagsFromCommandLine(&argc, argv, true);
+
+    QCoreApplication app(argc, argv);
+    tst_v8 tc;
+    return QTest::qExec(&tc, argc, argv);
+}
+
+#include "tst_v8.moc"
diff --git a/tests/auto/v8/v8.pro b/tests/auto/v8/v8.pro
new file mode 100644
index 00000000000..feda53bf501
--- /dev/null
+++ b/tests/auto/v8/v8.pro
@@ -0,0 +1,9 @@
+load(qttest_p4)
+macx:CONFIG -= app_bundle
+
+SOURCES += tst_v8.cpp v8test.cpp
+HEADERS += v8test.h
+
+CONFIG += parallel_test
+
+QT += v8-private
diff --git a/tests/auto/v8/v8main.cpp b/tests/auto/v8/v8main.cpp
new file mode 100644
index 00000000000..fa0137938e6
--- /dev/null
+++ b/tests/auto/v8/v8main.cpp
@@ -0,0 +1,17 @@
+#include "v8test.h"
+#include <stdio.h>
+
+#define RUN_TEST(testname) { \
+    if (!v8test_ ## testname()) \
+        printf ("Test %s FAILED\n", # testname); \
+}
+
+int main(int argc, char *argv[])
+{
+    v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+
+    RUN_TEST(eval);
+    RUN_TEST(userobjectcompare);
+
+    return -1;
+}
diff --git a/tests/auto/v8/v8test.cpp b/tests/auto/v8/v8test.cpp
new file mode 100644
index 00000000000..a712bf12b42
--- /dev/null
+++ b/tests/auto/v8/v8test.cpp
@@ -0,0 +1,254 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "v8test.h"
+
+using namespace v8;
+
+#define BEGINTEST() bool _testPassed = true;
+#define ENDTEST() return _testPassed;
+
+#define VERIFY(expr) { \
+    if (!(expr)) { \
+        fprintf(stderr, "FAIL: %s:%d %s\n", __FILE__, __LINE__, # expr); \
+        _testPassed = false; \
+        goto cleanup; \
+    }  \
+}
+
+
+bool v8test_eval()
+{
+    BEGINTEST();
+
+    HandleScope handle_scope;
+    Persistent<Context> context = Context::New();
+    Context::Scope context_scope(context);
+
+    Local<Object> qmlglobal = Object::New();
+    qmlglobal->Set(String::New("a"), Integer::New(1922));
+
+    Local<Script> script = Script::Compile(String::New("eval(\"a\")"), NULL, NULL,
+                                           Handle<String>(), Script::QmlMode);
+
+    TryCatch tc;
+    Local<Value> result = script->Run(qmlglobal);
+
+    VERIFY(!tc.HasCaught());
+    VERIFY(result->Int32Value() == 1922);
+
+cleanup:
+    context.Dispose();
+
+    ENDTEST();
+}
+
+static int userObjectComparisonCalled = 0;
+static bool userObjectComparisonReturn = false;
+static Local<Object> expectedLhs;
+static Local<Object> expectedRhs;
+static bool expectedObjectsCompared = false;
+
+#define SET_EXPECTED(lhs, rhs) { \
+    expectedObjectsCompared = false; \
+    expectedLhs = lhs; \
+    expectedRhs = rhs; \
+}
+
+static bool UserObjectComparison(Local<Object> lhs, Local<Object> rhs)
+{
+    userObjectComparisonCalled++;
+
+    expectedObjectsCompared = (lhs == expectedLhs && rhs == expectedRhs);
+
+    return userObjectComparisonReturn;
+}
+
+inline bool runscript(const char *source) {
+    Local<Script> script = Script::Compile(String::New(source));
+    Local<Value> result = script->Run();
+    return result->BooleanValue();
+}
+
+bool v8test_userobjectcompare()
+{
+    BEGINTEST();
+
+    HandleScope handle_scope;
+    Persistent<Context> context = Context::New();
+    Context::Scope context_scope(context);
+
+    V8::SetUserObjectComparisonCallbackFunction(UserObjectComparison);
+
+    Local<ObjectTemplate> ot = ObjectTemplate::New();
+    ot->MarkAsUseUserObjectComparison();
+
+    Local<Object> uoc1 = ot->NewInstance();
+    Local<Object> uoc2 = ot->NewInstance();
+    context->Global()->Set(String::New("uoc1a"), uoc1);
+    context->Global()->Set(String::New("uoc1b"), uoc1);
+    context->Global()->Set(String::New("uoc2"), uoc2);
+    Local<Object> obj1 = Object::New();
+    context->Global()->Set(String::New("obj1a"), obj1);
+    context->Global()->Set(String::New("obj1b"), obj1);
+    context->Global()->Set(String::New("obj2"), Object::New());
+    Local<String> string1 = String::New("Hello World");
+    context->Global()->Set(String::New("string1a"), string1);
+    context->Global()->Set(String::New("string1b"), string1);
+    context->Global()->Set(String::New("string2"), v8::String::New("Goodbye World"));
+
+    // XXX Opportunity for optimization - don't invoke user callback if objects are
+    // equal.
+#if 0
+    userObjectComparisonCalled = 0; userObjectComparisonReturn = false;
+    VERIFY(true == runscript("uoc1a == uoc1b"));
+    VERIFY(userObjectComparisonCalled == 0);
+#endif
+
+    // Comparing two uoc objects invokes uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(false == runscript("uoc1a == uoc2"));
+    VERIFY(userObjectComparisonCalled == 1);
+
+    VERIFY(false == runscript("uoc2 == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 2);
+    userObjectComparisonReturn = true;
+    VERIFY(true == runscript("uoc1a == uoc2"));
+    VERIFY(userObjectComparisonCalled == 3);
+    VERIFY(true == runscript("uoc2 == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 4);
+
+    // != on two uoc object invokes uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(true == runscript("uoc1a != uoc2"));
+    VERIFY(userObjectComparisonCalled == 1);
+    VERIFY(true == runscript("uoc2 != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 2);
+    userObjectComparisonReturn = true;
+    VERIFY(false == runscript("uoc1a != uoc2"));
+    VERIFY(userObjectComparisonCalled == 3);
+    VERIFY(false == runscript("uoc2 != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 4);
+
+    // Comparison against a non-object doesn't invoke uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(false == runscript("uoc1a == string1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+    VERIFY(false == runscript("string1a == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+    VERIFY(false == runscript("2 == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+    VERIFY(true == runscript("uoc1a != string1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+    VERIFY(true == runscript("string1a != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+    VERIFY(true == runscript("2 != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 0);
+
+    // Comparison against a non-uoc-object still invokes uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(false == runscript("uoc1a == obj1a"));
+    VERIFY(userObjectComparisonCalled == 1);
+    VERIFY(false == runscript("obj1a == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 2);
+    userObjectComparisonReturn = true;
+    VERIFY(true == runscript("uoc1a == obj1a"));
+    VERIFY(userObjectComparisonCalled == 3);
+    VERIFY(true == runscript("obj1a == uoc1a"));
+    VERIFY(userObjectComparisonCalled == 4);
+
+    // != comparison against a non-uoc-object still invokes uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(true == runscript("uoc1a != obj1a"));
+    VERIFY(userObjectComparisonCalled == 1);
+    VERIFY(true == runscript("obj1a != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 2);
+    userObjectComparisonReturn = true;
+    VERIFY(false == runscript("uoc1a != obj1a"));
+    VERIFY(userObjectComparisonCalled == 3);
+    VERIFY(false == runscript("obj1a != uoc1a"));
+    VERIFY(userObjectComparisonCalled == 4);
+
+    // Comparing two non-uoc objects does not invoke uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    VERIFY(true == runscript("obj1a == obj1a"));
+    VERIFY(true == runscript("obj1a == obj1b"));
+    VERIFY(false == runscript("obj1a == obj2"));
+    VERIFY(false == runscript("obj1a == string1a"));
+    VERIFY(true == runscript("string1a == string1a"));
+    VERIFY(true == runscript("string1a == string1b"));
+    VERIFY(false == runscript("string1a == string2"));
+    VERIFY(userObjectComparisonCalled == 0);
+
+    // Correct lhs and rhs passed to uoc
+    userObjectComparisonCalled = 0;
+    userObjectComparisonReturn = false;
+    SET_EXPECTED(uoc1, uoc2);
+    VERIFY(false == runscript("uoc1a == uoc2"));
+    VERIFY(true == expectedObjectsCompared);
+    SET_EXPECTED(uoc2, uoc1);
+    VERIFY(false == runscript("uoc2 == uoc1a"));
+    VERIFY(true == expectedObjectsCompared);
+    SET_EXPECTED(uoc1, uoc2);
+    VERIFY(true == runscript("uoc1a != uoc2"));
+    VERIFY(true == expectedObjectsCompared);
+    SET_EXPECTED(uoc2, uoc1);
+    VERIFY(true == runscript("uoc2 != uoc1a"));
+    VERIFY(true == expectedObjectsCompared);
+    SET_EXPECTED(uoc1, obj1);
+    VERIFY(false == runscript("uoc1a == obj1a"));
+    VERIFY(true == expectedObjectsCompared);
+    SET_EXPECTED(obj1, uoc1);
+    VERIFY(false == runscript("obj1a == uoc1a"));
+    VERIFY(true == expectedObjectsCompared);
+
+cleanup:
+    V8::SetUserObjectComparisonCallbackFunction(0);
+    context.Dispose();
+
+    ENDTEST();
+}
diff --git a/tests/auto/v8/v8test.h b/tests/auto/v8/v8test.h
new file mode 100644
index 00000000000..812036dd668
--- /dev/null
+++ b/tests/auto/v8/v8test.h
@@ -0,0 +1,55 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef V8TEST_H
+#define V8TEST_H
+
+#ifdef QT_CORE_LIB
+#include <private/v8.h>
+#else
+#include <v8.h>
+#endif
+
+bool v8test_eval();
+bool v8test_userobjectcompare();
+
+#endif // V8TEST_H
+
diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index e9807553050..eafc6690c89 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -282,6 +282,7 @@ Configure::Configure(int& argc, char** argv)
     dictionary[ "WMSDK" ]           = "auto";
     dictionary[ "DIRECTSHOW" ]      = "no";
     dictionary[ "WEBKIT" ]          = "auto";
+    dictionary[ "V8" ]              = "auto";
     dictionary[ "DECLARATIVE" ]     = "auto";
     dictionary[ "DECLARATIVE_DEBUG" ]= "yes";
     dictionary[ "PLUGIN_MANIFESTS" ] = "yes";
@@ -991,6 +992,10 @@ void Configure::parseCmdLine()
             dictionary[ "WEBKIT" ] = "yes";
         } else if (configCmdLine.at(i) == "-webkit-debug") {
             dictionary[ "WEBKIT" ] = "debug";
+        } else if (configCmdLine.at(i) == "-no-v8") {
+            dictionary[ "V8" ] = "no";
+        } else if (configCmdLine.at(i) == "-v8") {
+            dictionary[ "V8" ] = "yes";
         } else if (configCmdLine.at(i) == "-no-declarative") {
             dictionary[ "DECLARATIVE" ] = "no";
         } else if (configCmdLine.at(i) == "-declarative") {
@@ -1876,6 +1881,8 @@ bool Configure::displayHelp()
         desc("SCRIPT", "yes",   "-script",              "Build the QtScript module.");
         desc("SCRIPTTOOLS", "no", "-no-scripttools",    "Do not build the QtScriptTools module.");
         desc("SCRIPTTOOLS", "yes", "-scripttools",      "Build the QtScriptTools module.");
+        desc("V8", "no",        "-no-v8",               "Do not build the V8 module.");
+        desc("V8", "yes",       "-v8",                  "Build the V8 module.");
         desc("DECLARATIVE", "no",    "-no-declarative", "Do not build the declarative module");
         desc("DECLARATIVE", "yes",   "-declarative",    "Build the declarative module");
         desc("DECLARATIVE_DEBUG", "no",    "-no-declarative-debug", "Do not build the declarative debugging support");
@@ -2190,7 +2197,7 @@ bool Configure::checkAvailability(const QString &part)
         }
     } else if (part == "WMSDK") {
         available = findFile("wmsdk.h");
-    } else if (part == "MULTIMEDIA" || part == "SCRIPT" || part == "SCRIPTTOOLS" || part == "DECLARATIVE") {
+    } else if (part == "MULTIMEDIA" || part == "SCRIPT" || part == "SCRIPTTOOLS" || part == "V8" || part == "DECLARATIVE") {
         available = true;
     } else if (part == "WEBKIT") {
         available = (dictionary.value("QMAKESPEC") == "win32-msvc2005") || (dictionary.value("QMAKESPEC") == "win32-msvc2008") || (dictionary.value("QMAKESPEC") == "win32-msvc2010") || (dictionary.value("QMAKESPEC") == "win32-g++");
@@ -2333,8 +2340,10 @@ void Configure::autoDetection()
         dictionary["PHONON"] = checkAvailability("PHONON") ? "yes" : "no";
     if (dictionary["WEBKIT"] == "auto")
         dictionary["WEBKIT"] = checkAvailability("WEBKIT") ? "yes" : "no";
+    if (dictionary["V8"] == "auto")
+        dictionary["V8"] = checkAvailability("V8") ? "yes" : "no";
     if (dictionary["DECLARATIVE"] == "auto")
-        dictionary["DECLARATIVE"] = dictionary["SCRIPT"] == "yes" ? "yes" : "no";
+        dictionary["DECLARATIVE"] = dictionary["V8"] == "yes" ? "yes" : "no";
     if (dictionary["DECLARATIVE_DEBUG"] == "auto")
         dictionary["DECLARATIVE_DEBUG"] = dictionary["DECLARATIVE"] == "yes" ? "yes" : "no";
     if (dictionary["AUDIO_BACKEND"] == "auto")
@@ -2392,9 +2401,9 @@ bool Configure::verifyConfiguration()
             if (!(l.contains(dictionary["ARM_FPU_TYPE"])))
                     cout << QString("WARNING: Using unsupported fpu flag: %1").arg(dictionary["ARM_FPU_TYPE"]) << endl;
     }
-    if (dictionary["DECLARATIVE"] == "yes" && dictionary["SCRIPT"] == "no") {
+    if (dictionary["DECLARATIVE"] == "yes" && dictionary["V8"] == "no") {
         cout << "WARNING: To be able to compile QtDeclarative we need to also compile the" << endl
-             << "QtScript module. If you continue, we will turn on the QtScript module." << endl
+             << "V8 module. If you continue, we will turn on the V8 module." << endl
              << "(Press any key to continue..)";
         if (_getch() == 3) // _Any_ keypress w/no echo(eat <Enter> for stdout)
             exit(0);      // Exit cleanly for Ctrl+C
@@ -2754,8 +2763,8 @@ void Configure::generateOutputVars()
 
 // No longer needed after modularization
 //    if (dictionary["DECLARATIVE"] == "yes") {
-//        if (dictionary[ "SCRIPT" ] == "no") {
-//            cout << "QtDeclarative was requested, but it can't be built due to QtScript being "
+//        if (dictionary[ "V8" ] == "no") {
+//            cout << "QtDeclarative was requested, but it can't be built due to V8 being "
 //                    "disabled." << endl;
 //            dictionary[ "DONE" ] = "error";
 //        }
@@ -3186,6 +3195,7 @@ void Configure::generateConfigfiles()
         if (dictionary["OPENSSL"] == "linked")       qconfigList += "QT_LINKED_OPENSSL";
         if (dictionary["DBUS"] == "no")              qconfigList += "QT_NO_DBUS";
         if (dictionary["WEBKIT"] == "no")            qconfigList += "QT_NO_WEBKIT";
+        if (dictionary["V8"] == "no")                qconfigList += "QT_NO_V8";
         if (dictionary["DECLARATIVE"] == "no")       qconfigList += "QT_NO_DECLARATIVE";
         if (dictionary["DECLARATIVE_DEBUG"] == "no") qconfigList += "QDECLARATIVE_NO_DEBUG_PROTOCOL";
         if (dictionary["PHONON"] == "no")            qconfigList += "QT_NO_PHONON";
@@ -3480,6 +3490,7 @@ void Configure::displayConfig()
         if (declarative == "yes")
             cout << "Declarative debugging......." << dictionary[ "DECLARATIVE_DEBUG" ] << endl;
     }
+    cout << "V8 support.................." << dictionary[ "V8" ] << endl;
     cout << "QtScript support............" << dictionary[ "SCRIPT" ] << endl;
     cout << "QtScriptTools support......." << dictionary[ "SCRIPTTOOLS" ] << endl;
     cout << "Graphics System............." << dictionary[ "GRAPHICS_SYSTEM" ] << endl;