QML: When available, use QQmlAccessors to read properties.

When a property is read from a QObject or the QML scope object, and we
can statically resolve the type to qreal/QObject/int/bool/QString, and
the property has an accessor declared for it, then use that accessor to
do the read.

This collapses the path of e.g.:
  Runtime::getQmlScopeObjectProperty
    -> QObjectWrapper::getProperty
      -> QObjectWrapper::getProperty
        -> LoadProperty
          -> QQmlAccessor::read
(all of which do various checks for all the stuff mentioned above) to:
  Runtime::accessQmlScopeObjectQRealProperty
    -> QQmlAccessor::read
which is a simple 4-line function, and doesn't need to do any check.

According to valgrind, this saves 170 instructions on x86 for the
simple binding:

Item {
    width: height
}

Change-Id: I0761d01e8f1a3c13ecbffe2d8e0317ce9c0a4db0
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/qml/jit/qv4isel_masm_p.h b/src/qml/jit/qv4isel_masm_p.h
index a92196f5f7..db9d440e83 100644
--- a/src/qml/jit/qv4isel_masm_p.h
+++ b/src/qml/jit/qv4isel_masm_p.h
@@ -124,8 +124,8 @@ protected:
     virtual void setActivationProperty(IR::Expr *source, const QString &targetName);
     virtual void initClosure(IR::Closure *closure, IR::Expr *target);
     virtual void getProperty(IR::Expr *base, const QString &name, IR::Expr *target);
-    virtual void getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, int index, IR::Expr *target);
-    virtual void getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingleton, int attachedPropertiesId, IR::Expr *target);
+    virtual void getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, QQmlPropertyData *property, int index, IR::Expr *target);
+    virtual void getQObjectProperty(IR::Expr *base, QQmlPropertyData *property, bool captureRequired, bool isSingleton, int attachedPropertiesId, IR::Expr *target);
     virtual void setProperty(IR::Expr *source, IR::Expr *targetBase, const QString &targetName);
     virtual void setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex);
     virtual void setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex);